JP2020075604A - Motor unit and electric bicycle - Google Patents

Abstract

To provide a motor unit which enables a space in a case to be effectively utilized, and to provide an electric bicycle.SOLUTION: A motor unit 3 includes: a case 4; a motor 5; an input shaft body 60; an input body 7 which rotates integrally with the input shaft body 60; an output body 8; a control board 35; and a rotation detection part 34. The output body 8 is disposed along an outer peripheral surface at the other end side as seen in an axis 600 direction of the input shaft body 60 so as to be rotatable around an axis 600 and receives rotational force from the input shaft body 60. The control board 35 is disposed spaced apart from a wall part 40 at the other end side as seen in the axis 600 direction of the case 4 and controls the motor 5. The rotation detection part 34 has: a detected part 341 which rotates with a rotary shaft unit 30 including the input shaft body 60 and the output body 8; and a detection part 342 which detects rotation of the detected part 341. The detected part 341 is disposed between the control board 35 and the wall part 40 at the other end side or at a position overlapping with the control board 35 in the axis 600 direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a motor unit and an electric bicycle, and more particularly, to a motor unit including a case, a motor, an input shaft, an output body, and a rotation detector, and an electric bicycle including the motor unit.

  Conventionally, an electrically assisted bicycle equipped with a motor drive unit is known (see, for example, Patent Document 1).

  The motor drive unit disclosed in Patent Document 1 includes a unit case, a motor, a crankshaft, a human power transmission body, an interlocking body, a control printed circuit board, and a rotation detector.

International publication 2014/184826

  In the electrically assisted bicycle disclosed in Patent Document 1, the rotating body of the rotation detector is located closer to the center of the unit case than the control printed circuit board in the axial direction of the crankshaft. For this reason, the space inside the unit case has not been effectively utilized.

  The present invention has been made in view of the above conventional problems, and provides a motor unit and an electric bicycle that can effectively use the space in the case by arranging the detected portion of the rotation detecting portion at a predetermined position. To provide.

  In order to solve the above problems, a motor unit according to one aspect includes a case, a motor in which a rotating shaft is housed in the case, an input shaft body, an input body, an output body, a control board, and a rotation detection. And a section. The input shaft body is arranged rotatably around the axis line, penetrating the case in the axial direction. The input body is arranged along an outer peripheral surface of the input shaft body at one end side in the axial direction and rotates integrally with the input shaft body. The output body is rotatably arranged around the axis along an outer peripheral surface of the input shaft on the other end side in the axial direction, and receives a rotational force from the input shaft. The control board is arranged with a space from the wall portion on the other end side in the axial direction of the case, and controls the motor. The rotation detection unit includes a detection unit that rotates together with a rotation shaft unit that includes the input shaft body and the output body, and a detection unit that detects rotation of the detection unit. The detected part is arranged between the control board and the wall portion on the other end side in the axial direction, or arranged at a position overlapping the control board in the axial direction.

  In order to solve the above problems, a motor unit of another form includes a case, a motor in which a rotating shaft is housed in the case, an input shaft body, an input body, an output body, a speed reduction mechanism, and rotation detection. And a section. The input shaft body is arranged rotatably around the axis line, penetrating the case in the axial direction. The input body is arranged along an outer peripheral surface of the input shaft body at one end side in the axial direction and rotates integrally with the input shaft body. The output body is rotatably arranged around the axis along an outer peripheral surface of the input shaft on the other end side in the axial direction, and receives a rotational force from the input shaft. The speed reduction mechanism is housed in the case on the other end side of the input shaft body in the axial direction, and decelerates the rotation of the motor and transmits the rotation to the output body. The rotation detection unit includes a detection unit that rotates together with a rotation shaft unit that includes the input shaft body and the output body, and a detection unit that detects rotation of the detection unit. The detected portion is arranged in the axial direction between the reduction mechanism and the wall portion of the case on the other end side in the axial direction.

  In order to solve the above problems, a motor unit according to still another form is a case, a motor in which a rotating shaft is housed in the case, an input shaft body, an input body, a first output body, and a second output. A body, a reduction gear, and a rotation detector are provided. The input shaft body is arranged rotatably around the axis line, penetrating the case in the axial direction. The input body is arranged along an outer peripheral surface of the input shaft body at one end side in the axial direction and rotates integrally with the input shaft body. The first output body is rotatably arranged around the axis along an outer peripheral surface of the input shaft on the other end side in the axial direction, and receives a rotational force from the input shaft. The second output body is arranged on the other end side in the axial direction of the case and outputs the output of the motor. The reduction gear is housed in the case on the other end side of the input shaft body in the axial direction with respect to the rotor and the stator of the motor, decelerates the rotation of the motor, and transmits the rotation to the second output body. To do. The rotation detection unit includes a detection unit that rotates together with a rotation shaft unit that includes the input shaft body and the first output body, and a detection unit that detects rotation of the detection unit. The detected part is arranged between the reduction gear and the wall part on the other end side of the case in the axial direction in the axial direction.

  In order to solve the above-mentioned subject, one form of an electric bicycle is provided with the motor unit.

  In the motor unit and the electric bicycle according to the present disclosure, by arranging the detected portion of the rotation detecting portion at a predetermined position, it is easy to effectively use the space in the case.

FIG. 1 is a side view of the electric bicycle according to the first embodiment. FIG. 2 is a sectional view of a frame and a motor unit of the above electric bicycle. FIG. 3 is a cross-sectional view of a section taken along the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the speed reduction mechanism. FIG. 4 is a side view of the same motor unit case on the second divided body side. FIG. 5 is a side view of the same motor unit case on the first divided body side. FIG. 6 is an enlarged view of a main part of FIG. FIG. 7 is an enlarged view of essential parts of a cut surface passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the second embodiment. FIG. 8 is an enlarged view of essential parts of a cut surface passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis line of the second output body of the reduction mechanism according to the third embodiment. FIG. 9 is a cross-sectional view taken along a cross section taken along the axis of the input shaft of the motor unit, the rotation shaft of the motor, and the output body of the reduction mechanism according to the fourth embodiment. FIG. 10 is a cross-sectional view taken along a cross section passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the fifth embodiment. FIG. 11 is a cross-sectional view of a cross section taken along the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the sixth embodiment. FIG. 12 is a cross-sectional view taken along a section plane that passes through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the seventh embodiment. FIG. 13 is an enlarged view of an essential part of a cut surface passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the eighth embodiment. FIG. 14 is an enlarged view of essential parts of a cut surface passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the ninth embodiment. FIG. 15 is an enlarged view of essential parts of a cut surface passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the tenth embodiment. FIG. 16 is a side view of the case of the above motor unit on the first divided body side. FIG. 17 is an enlarged view of essential parts of a cut surface passing through the input shaft of the motor unit, the rotation shaft of the motor, and the axis of the second output body of the reduction mechanism according to the eleventh embodiment.

  The present disclosure relates to a motor unit and an electric bicycle, and more particularly to a motor unit including a case, a motor, an input shaft, an output body, and a rotation detection unit, and an electric bicycle including the motor unit.

  Hereinafter, a first embodiment of a motor unit and an electric bicycle according to the present disclosure will be described with reference to FIGS. 1 to 6.

  As shown in FIG. 1, the electric bicycle 1 includes a frame 10, wheels 11, and a motor unit 3. The traveling direction of the electric bicycle 1 is fixed by design. In the following description, the traveling direction is the front and the opposite direction is the rear. Further, the left side and the right side are the left side and the right side, respectively, when facing forward.

  The frame 10 supports a person who drives the electric bicycle 1 (hereinafter referred to as a driver). The load of the frame 10 and the driver is supported on the ground via front wheels 111 and rear wheels 112 that form the wheels 11.

  The frame 10 has a head pipe 101, an upper pipe 102, a lower pipe 103, a standing pipe 104, a seat stay 105, a chain stay 106, and a bracket 2. The frame 10 is formed of a metal such as aluminum or stainless steel, but may partially include a nonmetal. Further, the entire frame 10 may be made of non-metal, and the material of the frame 10 is not particularly limited.

  As shown in FIG. 2, the head pipe 101 is a tubular member that is open in a generally vertical direction. It should be noted that the generally vertical direction here means a direction that forms an angle of about 30 degrees or less with the vertical direction. As shown in FIG. 1, the handle post 12 is inserted into the head pipe 101 so as to vertically pass therethrough. The handle post 12 is inserted into the head pipe 101 so as to be rotatable around the axial direction. A front fork 121 is formed at the lower end of the handle post 12. The front wheel 111 is rotatably attached to the front fork 121. A handle bar 122 is fixed to the upper end of the handle post 12. The handlebar 122 is provided with a hand-operated unit for performing electric switching and the like, and a gear shift operating unit for changing the speed by the gear shift mechanism of the rear wheel 112.

  As shown in FIG. 2, the upper pipe 102 is a tubular member that extends substantially rearward from the head pipe 101. The upper pipe 102 does not necessarily have to be linear. The term "approximately rearward" as used herein means a direction that forms an angle of approximately 40 degrees or less with the rearward direction. The front end of the upper pipe 102 is fixed to the rear side wall of the head pipe 101 by welding or the like. The rear end of the upper pipe 102 is fixed to the standing pipe 104.

  The standing pipe 104 is a tubular member that is open in the up-down direction. The rear end of the upper pipe 102 is fixed to the front side wall near the upper end of the standing pipe 104 by welding or the like. As shown in FIG. 1, a shaft extending below the saddle 13 is inserted into the opening at the upper end of the standing pipe 104. By fixing this shaft to the vertical pipe 104, the saddle 13 is fixed to the vertical pipe 104.

  As shown in FIG. 2, the lower pipe 103 is a tubular member that extends obliquely downward and substantially rearward of the head pipe 101. The lower pipe 103 does not necessarily have to be linear. It should be noted that the term “substantially rearward and downward” as used herein means a direction that is lower than the rear and that extends downward from the direction in which the head pipe 101 extends. The front end of the lower pipe 103 is fixed by welding or the like to a portion of the side wall on the rear side of the head pipe 101, which is below the portion to which the upper pipe 102 is fixed. The bracket 2 is fixed to the rear end of the lower pipe 103.

  The motor unit 3 is fixed to the lower side of the bracket 2, and the motor unit 3 is supported by the bracket 2. The motor unit 3 is fixed to the bracket 2 by a fastening member composed of a bolt or a bolt / nut.

  The rear end of the lower pipe 103 is fixed to the front end of the bracket 2 by fitting (including shrink fitting), fastening or welding. In the first embodiment, a through hole 25 that vertically penetrates is formed in the front end portion of the bracket 2, and the tubular portion 251 projects from the peripheral portion of the through hole 25. The rear end portion of the lower pipe 103 is covered and fitted on the tubular portion 251.

  The lower end of the vertical pipe 104 is fixed to the middle portion of the bracket 2 in the front-rear direction by fitting (including shrink fitting), fastening, welding, or the like. In the first embodiment, the through hole 26 that vertically penetrates is formed in the middle portion of the bracket 2, and the tubular portion 261 projects from the peripheral portion of the through hole 26. A lower end portion of the standing pipe 104 is covered and fitted on the tubular portion 261.

  The front end of the chain stay 106 is fixed to the rear end of the bracket 2 by fitting (including shrink fitting), fastening, welding, or the like. The chain stay 106 is two hollow or solid members extending substantially rearward from the bracket 2. In the first embodiment, the front end of the cylindrical chain stay 106 is fixed to the rear end of the bracket 2 by welding. Further, a through hole 27 that vertically penetrates is formed at a position corresponding to the internal space of the chain stay 106 of the bracket 2.

  As shown in FIG. 1, the front end of the seat stay 105 is fixed to the rear end of the upper pipe 102 by fitting (including shrink fitting), fastening or welding. The seat stay 105 is two hollow or solid members extending substantially rearward from the vicinity of the upper end of the standing pipe 104. In the first embodiment, the front end of the tubular seat stay 105 is fixed by welding or the like. The rear end portion of the seat stay 105 is fixed to the rear end portion of the chain stay 106, and the rear wheel 112 is rotatably attached to this portion.

  In addition, as shown in FIG. 2, the bracket 2 and the lower pipe 103 have a battery mounting portion 16 to which a battery 15 (see FIG. 1) for supplying electric power to the motor unit 3 is mounted. The battery mounting portion 16 has a lower support portion 161 formed on the bracket 2 and an upper support portion 162 formed on the lower pipe 103. The lower support portion 161 is mounted so that the lower end portion of the battery 15 does not easily fall off, and supports the battery 15. The lower support portion 161 has a plurality of terminals electrically connected to a plurality of battery terminals for power supply or signals formed at the lower end of the battery 15. One end of the wiring 163 is electrically connected to each of the plurality of terminals.

  The upper support 162 has a lock device to which the upper end of the battery 15 is attached and which locks the battery 15 so that the battery 15 does not drop out.

  In addition, a shift wire 17 and a brake wire that connect the shift operation unit and the shift mechanism are passed through the lower pipe 103 and the wiring space 20.

  The motor unit 3 will be described below. As shown in FIG. 3, the motor unit 3 includes a case 4, a motor 5, an input shaft 6, an output body 8 (the first output body 8 in the first embodiment), and a reduction mechanism 31. Prepare

  The case 4 constitutes the outer shell of the motor unit 3. The case 4 accommodates devices such as the speed reduction mechanism 31 in the accommodation space formed inside. The case 4 is mainly formed of a metal such as aluminum or stainless steel, but a nonmetal may be used and the material of the case 4 is not particularly limited.

  The case 4 is divided into a first divided body 41 located on the left side and a second divided body 42 located on the right side. The case 4 is configured by combining the first divided body 41 and the second divided body 42.

  In the first divided body 41, the peripheral portion when viewed in the left-right direction protrudes to the right of the inside, and the accommodation space inside is opened to the right. Further, the first divided body 41 is partially provided with a motor cup 57 which projects to one side in the lateral direction and accommodates the motor 5 therein. The motor cup 57 is formed as a separate body from the first divided body 41. The motor cup 57 is fixed to the first divided body 41 by a fastening member 571 made of a bolt.

  When viewed in the left-right direction, the peripheral edge portion of the second divided body 42 projects leftward from the inside, and the accommodation space inside is opened leftward. The first divided body 41 and the second divided body 42 are aligned from the left and right so that their accommodation spaces are continuous, and are fixed to each other by a fastening member made of a bolt. The first divided body 41 and the second divided body 42 are fixed to each other to form the case 4. The size, shape and thickness of the case 4 are not particularly limited. The accommodation space formed inside the case 4 may or may not be hermetically sealed.

  The motor 5 is attached to the case 4. More specifically, the motor 5 is housed mainly in the motor cup 57 attached to the first divided body 41. The motor 5 has a rotating shaft 51, a rotor 52 that rotates integrally with the rotating shaft 51, and a stator 53. The rotor 52, the stator 53, and part of the rotating shaft 51 are located inside the motor cup 57. The rotating shaft 51 is rotatably housed so that the axis of the rotating shaft 51 faces the left-right direction. The rotating shaft 51 protrudes from the stator 53 to one side (rightward in the first embodiment), and a tooth portion 54 that meshes with the speed reduction mechanism 31 is formed on the outer surface of the protruding portion. An intermediate portion of the rotary shaft 51 is supported by a rotary shaft support bearing 551 arranged in the second split body 42. The left end of the rotary shaft 51 does not particularly project from the stator 53 and is supported by the rotary shaft support bearing 552 arranged in the motor cup 57.

  The input shaft 6 penetrates the case 4 in the direction of the axis 600 (the left-right direction in the first embodiment) and is rotatably arranged around the axis 600 of the input shaft 6. The input shaft 6 includes an input shaft body 60 and an input body 7. In the first embodiment, the input shaft body 60 has a cylindrical shape made of a hollow member, but may be made of a solid member.

  The case 4 has a first bearing 45 that rotatably supports the input shaft body 60 on one end side (left end side in the first embodiment) in the direction of the axis 600. An input shaft hole 411 through which the input shaft body 60 passes is formed in the first divided body 41, and a first bearing 45 is arranged in the input shaft hole 411. In the first embodiment, the first bearing 45 is a ball bearing. Various other bearings such as a roller bearing can be used as the first bearing 45, and the first bearing 45 is not limited to a ball bearing.

  Further, the case 4 has a second bearing 46 that rotatably supports the input shaft body 60 on the other end side in the direction of the axis 600 (right end side in the first embodiment). An input shaft hole 421 through which the input shaft body 60 passes is formed in the second divided body 42, and a second bearing 46 is arranged in this input shaft hole 421. In the first embodiment, the input shaft body 60 is indirectly supported by the second bearing 46 via the first output body 8. In the first embodiment, the second bearing 46 is a ball bearing. Note that various other bearings such as a roller bearing can be used as the second bearing 46, and the second bearing 46 is not limited to a ball bearing.

  One end of the crank arm 18 is fixed to the end of the input shaft body 60. A pedal 181 is rotatably attached to the other end of the crank arm 18, as shown in FIG. The driver of the electric bicycle 1 can transmit the rotational force of human power to the input shaft body 60 by pedaling the pedal 181.

  As shown in FIG. 3, the input body 7 is arranged along the outer peripheral surface of the input shaft body 60 and rotates integrally with the input shaft body 60. The input body 7 is a tubular member, and its axis 600 is oriented in the left-right direction, and is arranged concentrically with the input shaft 60. The horizontal length of the input body 7 is shorter than the horizontal length of the input shaft body 60. The input body 7 and the input shaft body 60 have fitting portions 711 and 61, which are fitted to each other so as to be relatively unrotatable around the axis 600, in a part in the direction of the axis 600. In the first embodiment, the left end portion of the input body 7 (more specifically, the first input body 71 to be described later) and the input shaft body 60 corresponding to this portion are fitted to the fitting portions 711, 61 including spline portions or serration portions. Are formed. The fitting portions 711 and 61 may be configured to be fitted with a male screw and a female screw.

  Further, in the first embodiment, the input body 7 is divided into a first input body 71 and a second input body 72. The first input body 71 is connected to the input shaft body 60. The first input body 71 is located in a part of the input shaft body 60 in the left-right direction, and is housed in the first split body 41. A fitting portion 711 that fits into the input shaft body 60 is formed at the left end portion of the first input body 71. A gap 70 is formed between the first input body 71 and the input shaft body 60 at the right side of the fitting portion 711 at the left end portion. This makes it easy to insert the input shaft body 60 into the first input body 71 having a tubular shape.

  The second input body 72 is located at a position different from the first input body 71 in the direction of the axis 600 (to the right of the first input body 71 in the first embodiment), is connected to the first input body 71, and has the first output. The rotational force is transmitted to the body 8. However, the second input body 72 may be partially located at the same position in the left-right direction as the first input body 71. In the first embodiment, the left end portion of the second input body 72 is located radially outside the right end portion of the first input body 71 and overlaps in the radial direction. The first input body 71 and the second input body 72 have fitting portions 712 and 721 that are fitted to each other so as to be relatively unrotatable around the axis 600. In the first embodiment, fitting portions 712 and 721 including spline portions or serration portions are formed at the right end portion of the first input body 71 and the left end portion of the second input body 72. In the present invention, “overlapping in the radial direction” refers to a state in which at least a part of each object overlaps in the radial direction.

  The first output body 8 is arranged rotatably around the axis 600 along the outer peripheral surface of the input shaft 60 at one end side in the direction of the axis 600, and receives the rotational force from the input body 7. The first output body 8 is a substantially cylindrical member, and its axis 600 is oriented in the left-right direction, and is arranged concentrically with the input shaft body 60. The horizontal length of the first output body 8 is shorter than the horizontal length of the input shaft body 60. The right end portion of the first output body 8 projects outside the case 4 through an input shaft hole 421 formed in the second divided body 42. The first output body 8 is supported by the second bearing 46 arranged in the second divided body 42. The first output body 8 constitutes the rotary shaft unit 30 together with the input shaft body 60 and the input body 7. The rotary shaft unit 30 is supported by the case 4 via the first bearing 45 and the second bearing 46.

  A sprocket 191 on the front side is fixed to a portion of the first output body 8 protruding outside the case 4. The front sprocket 191 rotates integrally with the first output body 8. Further, as shown in FIG. 1, the rear sprocket 192 is fixed to the hub of the rear wheel 112. A chain 193 is wound around the front sprocket 191 and the rear sprocket 192.

  As shown in FIG. 3, in the first embodiment, the one-way clutch 32 is arranged between the input body 7 and the first output body 8. The input body 7 and the first output body 8 are overlapped in the radial direction of the input shaft 6 so that the input body 7 is on the outer side and the first output body 8 is on the inner side, which is a so-called inner output structure. The one-way clutch 32 transmits the rotational force to the first output body 8 when the input body 7 receives a rotational force in a direction for accelerating the electric bicycle 1 in the traveling direction (hereinafter, referred to as an acceleration direction), and the one-way clutch 32 accelerates the acceleration direction. When a rotational force in the opposite direction is applied, this rotational force is not transmitted to the first output body 8. The one-way clutch 32 does not transmit the rotational force to the input body 7 when the rotational force in the acceleration direction is applied to the first output body 8 via the speed reduction mechanism 31 described later. In the first embodiment, the one-way clutch 32 has a ratchet and is supplied with grease. Various one-way clutches 32 can be used as appropriate and are not limited. For example, a roller type one-way clutch or a sprag type one-way clutch may be used.

  Further, in the first embodiment, the second input body 72 and the first output body 8 overlap each other in the radial direction of the input shaft body 60 in a partial range in the direction of the axis 600. The one-way clutch 32 is provided between the second input body 72 and the first output body 8 which overlap each other in the radial direction.

  Moreover, in the first embodiment, the motor unit 3 includes a second output body 310 that is different from the first output body. The motor unit 3 of the first embodiment is a so-called biaxial motor unit. One end portion (the left end portion in the first embodiment) of the second output body 310 in the axial direction is located inside the case 4 and is rotatably supported by the bearing 3141 arranged in the first divided body 41. The inner ring 3143 of the bearing 3141 is fixed to the second output body 310. Further explaining, the inner ring 3143 of the bearing 3141 is fitted with the convex portion formed at the end of the second output body 310.

  The outer ring 3144 of the bearing 3141 is fixed to the case 4. Further describing, the outer ring 3144 of the bearing 3141 is fitted in a cylinder formed in the first divided body 41 and having an inner diameter substantially the same as the outer diameter of the outer ring 3144.

  The other end (right end in the first embodiment) of the second output body 310 in the axial direction is rotatably supported by a bearing 3142 arranged in the second split body 42, and the right end is located outside the case 4. A sprocket 194 is fixed to the right end of the second output body 310 so as to rotate integrally with the second output body 310. A chain 193, which is wound around the front sprocket 191, is wound around the sprocket 194.

  A reduction gear 311 having a large diameter tooth portion 312 that meshes with the tooth portion 54 of the rotation shaft 51 of the motor 5 is attached to the outer peripheral surface of the second output body 310 via a one-way clutch 313.

  When the driver pedals the pedal 181 of the electric bicycle 1, a rotational force in the acceleration direction is applied to the input shaft body 60. When the input shaft body 60 rotates, the first input body 71 and the second input body 72 rotate together with the input shaft body 60. The rotational force of the second input body 72 in the acceleration direction is applied to the first output body 8 via the one-way clutch 32, and the first output body 8 and the front sprocket 191 rotate in the acceleration direction. When the front sprocket 191 rotates in the acceleration direction, a rotational force in the acceleration direction is applied to the rear sprocket 192 via the chain 193, and the rear sprocket 192 and the rear wheel 112 rotate in the acceleration direction. As a result, the electric bicycle 1 advances in the traveling direction.

  When the rotating shaft 51 of the motor 5 rotates in the accelerating direction while the electric bicycle 1 is manually advanced in the moving direction, the tooth portion 312 meshing with the rotating shaft 51 of the motor 5 rotates in the accelerating direction. The rotational force of the tooth portion 312 in the acceleration direction is transmitted to the second output body 310 via the one-way clutch 313 and applied to the chain 193.

  If the motor 5 is not driven while the electric bicycle 1 is manually moving in the traveling direction, the second output body 310 rotates in the acceleration direction, but the rotational force in the acceleration direction of the second output body 310 is equal to the one-way clutch. It is not transmitted to the rotating shaft 51 of the motor 5 by 313. This prevents the rotation shaft 51 and the rotor 52 from rotating when the motor 5 is not driven.

  In the motor unit 3, as shown in FIG. 4, a control board 35 having a control unit for controlling the motor 5 is arranged in the case 4. The control unit has a microcomputer, for example, and controls the operation of each element by executing a program stored in a storage unit such as a ROM (Read Only Memory). Various types of control units can be used as appropriate, and detailed description thereof will be omitted. The control unit controls the rotational force from the motor 5 based on the torque detected by the torque detection unit 33 and the number of rotations detected by the rotation detection unit 34.

  The control board 35 is arranged with a gap from the wall portion 40 on the other end side (right side in FIG. 3) of the case 4 in the axis line 600 direction, and is thermally coupled to the wall portion 40. The control board 35 has a plurality of mounted electric components 351. The plurality of electric components 351 include, for example, a capacitor, an integrated circuit (Hall IC), and a heating element that is particularly likely to generate heat. The heating element is, for example, a switching element such as an FET that supplies electric power to the motor 5, a diode, a coil, or the like. In addition, the plurality of electric components 351 may include various resistors, connectors, and the like. The control board 35 is mounted with either a switching element such as an FET or a microcomputer.

  The second divided body 42 of the case 4 is connected to the control board 35 via the heat conductive sheet 91. The heat generated from the plurality of heating elements is efficiently radiated from the outer surface of the case 4 via the heat conductive sheet 91. Further, the control board 35 is arranged on the right side of the stator 53 of the motor 5 in the direction of the axis 600.

  In the electric bicycle 1, the rotational force from the motor 5 is controlled according to the torque applied to the input shaft 6 (the input shaft body 60) and the number of rotations of the input shaft body 60 per unit time. The torque applied to the input shaft body 60 is detected by the torque detection unit 33. The torque detection unit 33 is arranged in a partial range along the outer peripheral surface of the rotary shaft unit 30 in the direction of the axis 600.

  In the first embodiment, the magnetostriction generating unit 331 having magnetic anisotropy is formed on the outer peripheral surface of the first input body 71. Further, the coil 332 is arranged at a slight distance from the portion of the outer peripheral surface of the first input body 71 where the magnetostriction generating portion 331 is provided. The magnetostrictive generator 331 and the coil 332 constitute a magnetostrictive torque sensor as the torque detector 33. As such a magnetostrictive torque sensor, various types can be appropriately used. The torque detection unit 33 is not limited to the magnetostrictive torque sensor.

  The torque detector 33 is arranged on the left side of the one-way clutch 32 and the second bearing 46 in the direction of the axis 600.

  The rotation speed of the input shaft 6 (input shaft body 60) per unit time is detected by the rotation detection unit 34. As shown in FIG. 6, the rotation detection unit 34 has a detected unit 341 attached to the rotary shaft unit 30 and a detection unit 342 fixed to a portion other than the rotary shaft unit 30.

  The detected part 341 is arranged between the control board 35 and the wall 40.

  In the first embodiment, the rotating body 340 is attached to the outer peripheral surface of the second input body 72. The rotating body 340 is attached by press-fitting the outer peripheral surface of the second input body 72 into the inner peripheral surface thereof. The rotating body 340 rotates integrally with the second input body 72. The rotating body 340 has a portion extending in the direction of the axis 600 of the input shaft 6 and a portion extending in the radial direction of the input shaft 6. A portion extending in the radial direction of the input shaft 6 has magnets arranged at regular intervals in the circumferential direction as a detected portion 341. Further, a Hall IC that detects the magnetic force of the magnet is fixed to the control board 35 as a detection unit 342 at a position corresponding to the magnet that is the detected unit 341. As the rotation detecting section 34 having such a magnet and a Hall IC, various ones can be appropriately used. The rotation detection unit 34 is not limited to the one having the magnet and the Hall IC.

  In the first embodiment, the detected part 341 of the rotation detection part 34 is on the right side of the control board 35 (the other end side in the axis line 600 direction), and therefore, on the left side of the control board 35 in the case 4 (one side of the axis line 600 direction). It is difficult to occupy the space on the end side, and the space in the case 4 can be effectively utilized.

  Here, “the detected part 341 is attached to the second input body 72.” means that when the detected part 341 is directly attached to the second input body 72, the detected part 341 is attached via another member. It includes a case where the second input body 72 is attached and a case where the detected part 341 is formed integrally with the second input body 72. Further, "attached" includes not only the state of being fixed by press fitting, screwing, welding, etc. but also the state of being engaged by serrations or splines.

  As shown in FIGS. 3 and 5, in the first embodiment, the first divided body 41 has a partition 412 that partitions the motor 5, the rotary shaft unit 30, and the torque detector 33. The partition part 412 can reduce the influence of the magnetic field fluctuation generated in the motor 5 on the torque detection part 33. That is, by providing the partition portion 412, it is possible to suppress a decrease in torque detection accuracy of the torque detection unit 33 due to a magnetic field fluctuation generated in the motor 5. The partition part 412 may be separate from the first divided body 41. The partition 412 is preferably made of a soft magnetic material such as iron. By using a soft magnetic material such as iron, the effect of suppressing a decrease in the torque detection accuracy of the torque detection unit 33 due to the magnetic field fluctuation generated in the motor 5 becomes large.

  The second divided body 42 may have a divided portion 422 that is connected to the divided portion 412 of the first divided body 41. The partition parts 412 and 422 which are a part of the case 4 are located along the axis 600 in the part of the rotary shaft unit 30 near the motor 5 and have openings 4121 through which the rotary shaft unit 30 side and the motor 5 side pass. have. The opening 4121 may be provided in the partition 422, or may be a gap formed between the partition 412 and the partition 422. The control board 35 or the detected part 341 is arranged so as to penetrate the opening 4121. With this configuration, the board on which the detection unit 342 is mounted and the board on which other components are mounted can be shared, and the number of components can be reduced.

  In the first embodiment, the detection unit 342 is mounted on the control board 35, but the detection unit 342 may be mounted on a board for realizing a function other than the rotation detection. The substrate or the detected part 341 is arranged so as to penetrate the opening 4121. With this configuration, the board on which the detection unit 342 is mounted and the board on which other components are mounted can be shared, and the number of components can be reduced.

  In addition, the first divided body 41 has a partition portion 413 that partitions the motor 5 and the control board 35. The partition part 413 extends in the direction of the rotary shaft 51 from the periphery of the stator 53 of the motor 5 when viewed in the axial direction of the rotary shaft 51 of the motor 5. On the motor 5 side of the partition 413, a recess is formed in which the rotary shaft support bearing 551 that supports the rotary shaft 51 of the motor 5 is inserted.

  In the space surrounded by the first divided body 41 and the second divided body 42 and formed inside the motor unit 3, an oil shield 47 that covers the tooth portion 54 of the rotation shaft 51 of the motor 5 and the tip of the rotation shaft 51 is provided. It is arranged. The oil shield 47 is made of a material different from that of the first divided body 41 and the second divided body 42. The first divided body 41 and the second divided body 42 are made of metal. The oil shield 47 is preferably made of resin, and the weight of the motor unit 3 can be reduced.

  As a modification of the first embodiment, the arrangement position of the detection unit 342 of the rotation detection unit 34 may be changed. The detection unit 342 of the rotation detection unit 34, in the first direction when the direction of the straight line passing through the axis of the rotation shaft 51 of the motor 5 and the axis of the input shaft body 60 is the first direction when viewed in the direction of the axis 600 It may be arranged at a position where at least a part of the input body 7 or the output body 8 overlaps, or may be arranged closer to the rotary shaft 51 side of the motor 5 than the input body 7 or the output body 8 in the first direction. The arrangement position of the detection unit 342 can be changed by changing the shape of the control board 35. By changing the position of the detection unit 342 of the rotation detection unit 34 in the first direction, the space in the case 4 can be used more effectively and the motor unit 3 can be downsized.

  Next, the motor unit 3 of the second embodiment will be described based on FIG. 7. The motor unit 3 of the second embodiment is the same as the motor unit 3 of the first embodiment in most parts. Hereinafter, the part different from the first embodiment will be mainly described.

  In the first embodiment, the detected portion 341 is arranged between the control board 35 and the wall portion 40, whereas in the second embodiment, the detected portion 341 is arranged in the direction of the axis 600 and the control board 35. It is placed in the overlapping position.

  In the second embodiment, magnets are fixed to the outer peripheral surface of the second input body 72 as the detected portions 341 at regular intervals in the circumferential direction. Further, a Hall IC is fixed as a detection unit 342 to the end of the control board 35 on the rotary shaft unit 30 side.

  The length of the case 4 in the left-right direction can be shortened.

  Next, the motor unit 3 of the third embodiment will be described with reference to FIG. The motor unit 3 of the third embodiment is the same as the motor unit 3 of the first embodiment for the most part. Hereinafter, the part different from the first embodiment will be mainly described.

  In the first embodiment, the rotation detection unit 34 has a magnet and a Hall IC, whereas in the third embodiment, the rotation detection unit 34 has a so-called optical sensor.

  In the third embodiment, the rotating body 340 is fixed to the outer peripheral surface of the second input body 72 so as to rotate integrally with the second input body 72. The rotating body 340 has, as the detected portion 341, tooth portions and light transmitting portions formed between the tooth portions at regular intervals in the circumferential direction. Further, as the detection unit 342, an optical sensor is arranged so as to sandwich the tooth portion of the rotating body from the left and right. The optical sensor includes the light emitting portion 343 arranged on the left side of the tooth portion and the light receiving portion 344 arranged on the right side of the tooth portion, but the positional relationship between the light emitting portion 343 and the light receiving portion 344 is not limited. As the rotation detecting unit 34 having such a rotating body and an optical sensor, various ones can be appropriately used.

  Next, the motor unit 3 of 4th embodiment is demonstrated based on FIG. The motor unit 3 of the fourth embodiment is the same as the motor unit 3 of the first embodiment in most parts. Hereinafter, the part different from the first embodiment will be mainly described.

  The motor unit 3 in the first embodiment is a so-called biaxial motor unit, and has the first output body 8 and the second output body 310 independent of the first output body 8. On the other hand, the motor unit 3 in the fourth embodiment is a so-called uniaxial motor unit, and is different in that it does not have the second output body 310 as an output body and has only the output body 8. The speed reduction mechanism 31 is also different from the speed reduction mechanism 31 of the first embodiment depending on the output body 8.

  The output body 8 has a web 81 and a rim 82 on the outer peripheral surface side in a portion overlapping the input body 7 in the direction of the axis 600. The web 81 projects outward in the radial direction. The rim 82 is continuous with the radially outer end of the web 81. The length of the rim 82 in the direction of the axis 600 is longer than the length of the web 81 in the direction of the axis 600. The rim 82 has a tooth portion 83 that meshes with the reduction mechanism 31 on the outer peripheral surface.

  The deceleration mechanism 31 is housed in the case 4, decelerates the rotation of the motor 5 and transmits it to the output body 8. The reduction mechanism 31 has a first transmission gear 315 and a second transmission gear 316. The outer diameter of the first transmission gear 315 is larger than the outer diameter of the second transmission gear 316. The number of teeth of the first transmission gear 315 is larger than the number of teeth of the second transmission gear 316.

  The first transmission gear 315 is rotated by the rotational force of the rotary shaft 51 of the motor 5. In the first embodiment, the first transmission gear 315 is formed of a tubular member, and has a tooth portion 3151 that meshes with the tooth portion 54 formed on the rotary shaft 51 of the motor 5 on the outer peripheral surface. The first transmission gear 315 is arranged along the outer peripheral surface of the transmission rotation shaft 3101 included in the reduction mechanism 31. In the first embodiment, the first transmission gear 315 is configured to receive the rotational force directly from the rotary shaft 51 of the motor 5, but a gear may be interposed therebetween.

  The transmission rotary shaft 3101 is rotatably housed in the case 4 such that the axial direction thereof faces the left-right direction. The transmission rotary shaft 3101 is located rearward of the rotary shaft 51 of the motor 5, and is arranged in the left-right direction at substantially the same position as a portion of the rotary shaft 51 protruding rightward from the stator 53. The left end of the transmission rotary shaft 3101 is supported by the transmission rotary shaft support bearing 3171 arranged in the first divided body 41, and the right end of the transmission rotary shaft 3101 is supported in the second divided body 42. It is supported by bearings 3172.

  The first transmission gear 315 is connected to the transmission rotation shaft 3101 via a one-way clutch 318. The one-way clutch 318 transmits this rotational force to the transmission rotary shaft 3101 when the rotational force in the acceleration direction is applied to the first transmission gear 315, and transmits this rotational force when the rotational force in the opposite direction to the acceleration direction is applied. It does not transmit to the transmission rotary shaft 3101. In addition, when a rotational force in the acceleration direction is applied to the transmission rotary shaft 3101, this rotational force is not transmitted to the first transmission gear 315.

  The second transmission gear 316 is fixed to the right side of the portion of the transmission rotation shaft 3101 where the one-way clutch 318 is fixed so as to rotate integrally with the transmission rotation shaft 3101. The second transmission gear 316 transmits the rotational force received from the first transmission gear 315 via the transmission rotation shaft 3101 to the tooth portion 83 of the output body 8. The second transmission gear 316 has a tooth portion 319 that meshes with a tooth portion 83 formed on the rim 82 of the output body 8 on the outer peripheral surface.

  When the driver pedals the pedal 181 of the electric bicycle 1, a rotational force in the acceleration direction is applied to the input shaft body 60. When the input shaft body 60 rotates, the first input body 71 and the second input body 72 rotate together with the input shaft body 60. The rotational force of the second input body 72 in the acceleration direction is applied to the output body 8 via the one-way clutch 32, and the output body 8 and the front sprocket 191 rotate in the acceleration direction. When the front sprocket 191 rotates in the acceleration direction, a rotational force in the acceleration direction is applied to the rear sprocket 192 via the chain 193, and the rear sprocket 192 and the rear wheel 112 rotate in the acceleration direction. As a result, the electric bicycle 1 advances in the traveling direction.

  Further, the rotating force from the motor 5 can be applied to the output body 8 as an assisting force while the electric bicycle 1 is manually advanced in the traveling direction. This will be described in detail below. When the rotation shaft 51 of the motor 5 rotates in the acceleration direction, the first transmission gear 315 meshing with the rotation shaft 51 of the motor 5 rotates in the acceleration direction. The rotational force of the first transmission gear 315 in the acceleration direction is transmitted to the transmission rotation shaft 3101 and the second transmission gear 316 fixed to the transmission rotation shaft 3101 via the one-way clutch 318, and the second transmission gear 316 moves in the acceleration direction. Rotate. The rotational force in the acceleration direction of the second transmission gear 316 is transmitted to the output body 8 that meshes with the second transmission gear 316. That is, the output body 8 functions as a resultant body in which the rotational force of the human power from the input body 7 and the rotational force from the motor 5 are combined. The motor unit 3 in the first embodiment is a so-called uniaxial motor unit 3.

  Further, a case will be described in which the motor 5 is not driven while the electric bicycle 1 is moving manually in the traveling direction. In this case, since the output body 8 rotates in the acceleration direction, the second transmission gear 316 and the transmission rotary shaft 3101 meshing with the output body 8 rotate in the acceleration direction, but the rotational force of the transmission rotary shaft 3101 in the acceleration direction is , The one-way clutch 318 does not transmit to the first transmission gear 315. This prevents the rotation shaft 51 and the rotor 52 from rotating when the motor 5 is not driven.

  Also in the fourth embodiment, the detected part 341 of the rotation detection part 34 is on the right side of the control board 35 (the other end side in the axis line 600 direction), so that the left side of the control board 35 in the case 4 (in the axis line 600 direction). It is difficult to occupy the space on the one end side, and the space inside the case 4 can be effectively utilized.

  Next, the motor unit 3 of 5th embodiment is demonstrated based on FIG. The motor unit 3 of the fifth embodiment is the same as the motor unit 3 of the first embodiment for the most part. Hereinafter, the part different from the first embodiment will be mainly described.

  In the first embodiment, the rotary shaft 51 is supported by the two rotary shaft support bearings 551 and 552, but the right end portion is a free end, and the rotary shaft 51 is easily bent to cause vibration. It was On the other hand, in the fifth embodiment, the right end of the rotary shaft 51 is supported by the rotary shaft support bearing 553, and the rotary shaft 51 is supported in a double-sided manner. As a result, the rotary shaft 51 is less likely to bend and the rotary shaft 51 is less likely to vibrate. The rotary shaft support bearing 553 is supported by the second split body 42. The rotary shaft support bearing 553 may be directly supported by the second split body 42, or may be indirectly supported by the second split body 42 with another member interposed therebetween. In the fifth embodiment, the support bearing 551 may not be provided.

  Next, the motor unit 3 of 6th embodiment is demonstrated based on FIG. The motor unit 3 of the sixth embodiment is almost the same as the motor unit 3 of the first embodiment. Hereinafter, the part different from the first embodiment will be mainly described.

  In the first embodiment, the inner ring 3143 of the bearing 3141 is in contact with the second output body 310, and the outer ring 3144 of the bearing 3141 is in contact with the case 4. On the other hand, in the sixth embodiment, the outer ring 3144 of the bearing 3141 is in contact with the second output body 310. Further describing, the outer ring 3144 of the bearing 3141 is fitted in a cylinder formed in the second output body 310 and having an inner diameter substantially the same as the outer diameter of the outer ring 3144.

  The inner ring 3143 of the bearing 3141 is fixed to the case 4. Further explaining, the inner ring 3143 of the bearing 3141 is fitted with the convex portion formed on the case 4. By adopting a structure in which the convex portion formed on the case 4 is fitted into the inner ring 3143 of the bearing 3141, the number of members of the case 4 supporting the bearing 3141 can be reduced as compared with the structure of the first embodiment, and the motor unit Weight reduction of 3 is achieved.

  Next, the motor unit 3 of the seventh embodiment will be described based on FIG. The motor unit 3 of the seventh embodiment is the same as the motor unit 3 of the sixth embodiment for the most part. Hereinafter, the part different from the sixth embodiment will be mainly described.

  In the sixth embodiment, the outer ring 3144 of the bearing 3141 is fitted into the cylinder formed in the second output body 310 and having an inner diameter substantially the same as the outer diameter of the outer ring 3144.

  On the other hand, in the seventh embodiment, the outer ring 3144 of the bearing 3141 is embedded in the end portion of the second output body 310.

  In addition, in the sixth embodiment, the oil shield portion 47 intersects with the rotating shaft 51 so as to cover a portion extending along the tooth portion 54 provided on the rotating shaft 51 of the motor 5 and the tip of the rotating shaft 51. And a portion extending in the direction.

  On the other hand, in the seventh embodiment, the oil shield 47 has a portion extending along the tooth portion 54 provided on the rotation shaft 51 of the motor 5, but rotates so as to cover the tip of the rotation shaft 51. It has no portion extending in the direction intersecting with the shaft 51.

  Next, the motor unit 3 of the eighth embodiment will be described with reference to FIG. Note that the motor unit 3 of the eighth embodiment is almost the same as the motor unit 3 of the first embodiment. Hereinafter, the part different from the first embodiment will be mainly described.

  In the first embodiment, the motor unit 3 has only the control board 35 as a board. On the other hand, in the eighth embodiment, the motor unit 3 has another board 352 in addition to the control board 35. Examples of the board 352 include, but are not limited to, a board for adding an acceleration detection function, a board for adding a GPS (Global Positioning System) function, and the like.

  The substrate 352 is fixed to the case 4 with screws or the like. The board 352 is arranged in parallel with the control board 35. The substrate 352 is arranged between the input shaft 6 and the rotary shaft 51 of the motor 5 when viewed in a direction substantially orthogonal to a plane including the axis 600 of the input shaft 6 and the rotary shaft 51 of the motor 5. Further, the substrate 352 may be arranged at a position sandwiched between the input shaft 6 and the rotation shaft 51 of the motor 5. The board 352 may be fixed to the control board 35 by a fixing member such as a screw via a spacer or the like.

  By providing the board 352 in addition to the control board 35, the function of the motor unit 3 can be expanded. Further, since the substrate 352 is arranged between the input shaft 6 and the rotating shaft 51 of the motor 5, it is possible to effectively utilize the space inside the case 4 and prevent the case 4 from increasing in size.

  Next, the motor unit 3 of the ninth embodiment will be described with reference to FIG. The motor unit 3 of the ninth embodiment is similar to the motor unit 3 of the eighth embodiment in most parts. Hereinafter, the part different from the eighth embodiment will be mainly described.

  In the eighth embodiment, the board 352 is arranged parallel to the control board 35. On the other hand, in the ninth embodiment, a substrate 353 different from the control substrate 35 is arranged so as to be orthogonal to the control substrate 35. The board 353 is held by a holder 354 formed on the control board 35. The substrate 353 is arranged between the input shaft 6 and the rotary shaft 51 of the motor 5 as viewed in a direction substantially orthogonal to a plane including the axis 600 of the input shaft 6 and the rotary shaft 51 of the motor 5. Further, the substrate 353 may be arranged at a position sandwiched between the input shaft 6 and the rotation shaft 51 of the motor 5.

  By providing the board 353 in addition to the control board 35, the function of the motor unit 3 can be expanded. Further, since the substrate 353 is arranged between the input shaft 6 and the rotary shaft 51 of the motor 5, it is possible to effectively utilize the space inside the case 4 and prevent the case 4 from increasing in size.

  Next, the motor unit 3 of the tenth embodiment will be described with reference to FIGS. 15 and 16. The motor unit 3 of the tenth embodiment is almost the same as the motor unit 3 of the first embodiment. Hereinafter, the part different from the first embodiment will be mainly described.

  In the first embodiment, the first divided body 41 has the partition portions 412 and the partition portions 413, and the second divided body 42 has the partition portions 422. On the other hand, in the tenth embodiment, the first divided body 41 does not have the partition portion 413, and the second divided body 42 does not have the partition portion 422. The motor unit 3 of the present embodiment may have a configuration that does not have at least one of the partition 412, the partition 413, and the partition 422.

  In a space surrounded by the first divided body 41 and the second divided body 42 and formed inside the motor unit 3, an oil shield 47 extending along the tooth portion 54 of the rotation shaft 51 of the motor 5 is arranged. There is. The oil shield 47 suppresses the scattering of the lubricating oil or grease that is injected into the teeth 54 and the adhesion to the control board 35. 16: is the figure which looked at the 1st division body 41 from the other end side of the axis line 600 direction. The first divided body 41 does not have a part of the partition portion 413. In FIG. 16, reference numeral 413a indicates an area where the partition 413 does not exist. In the present embodiment, the region 413a where the partition 413 does not exist occupies more than half of the area occupied by the motor 5 when viewed in the axial direction of the rotation shaft 51 of the motor 5. The area 413a in which the partition 413 does not exist may be half or less of the area occupied by the motor 5 when viewed in the axial direction of the rotation shaft 51 of the motor 5.

  Further, the region 413a where the partition 413 does not exist may be provided at least in a region overlapping with the rotor portion of the motor 5 as viewed in the axial direction of the rotation shaft 51 of the motor 5. This facilitates the arrangement of the rotation detector of the motor 5 and the power line that supplies power to the motor 5.

  In the tenth embodiment, since the case 4 does not have at least one of the partitions 412, 413, 422, the weight of the motor unit 3 can be reduced.

  Next, the motor unit 3 of the eleventh embodiment will be described based on FIG. The motor unit 3 of the eleventh embodiment is the same as the motor unit 3 of the sixth embodiment in most parts. Hereinafter, the part different from the sixth embodiment will be mainly described.

  In the sixth embodiment, the first divided body 41 has the partition portion 413. On the other hand, in the tenth embodiment, the first divided body 41 does not have the partition portion 413. Similar to the tenth embodiment, the second divided body 42 has an oil protection portion 47. The oil shield 47 has a portion extending along the tooth portion 54 provided on the rotation shaft 51 of the motor 5, but has a portion extending in a direction intersecting with the rotation shaft 51 so as to cover the tip of the rotation shaft 51. do not do. The oil shield 47 suppresses scattering of lubricating oil or grease that is applied to the teeth 54 provided on the rotary shaft 51 of the motor 5 and adhesion of the grease to the control board 35.

  In the eleventh embodiment, since the case 4 does not have the partition 413, the weight of the motor unit 3 can be reduced.

  In addition, in 1st embodiment, although the 1st division body 41 and the 2nd division body 42 had the division part 412 and the division parts 413 and 422, such a division part 412 and the division parts 413 and 422 are these. It may not be provided.

  In addition, in the second to ninth embodiments, the first divided body 41 and the second divided body 42 may have partition portions 412 and partition portions 413, 422.

  As is clear from the first to eleventh embodiments described above, the motor unit (3) of the first aspect has the case (4) and the rotation shaft (51) in the case (4). A motor (5) to be housed, an input shaft body (60), an input body (7), an output body (8), a control board (35), and a rotation detector (34) are provided. The input shaft body (60) passes through the case (4) in the direction of the axis (600) and is rotatably arranged around the axis (600). The input body (7) is arranged along the outer peripheral surface of the input shaft body (60) at one end side in the direction of the axis (600) and rotates integrally with the input shaft body (60). The output body (8) is rotatably arranged around the axis (600) along the outer peripheral surface on the other end side of the input shaft (60) in the direction of the axis (600), and is rotated by the input shaft (60). Receive. The control board (35) is arranged with a space from the wall portion (40) on the other end side in the direction of the axis (600) of the case (4) and controls the motor (5). The rotation detector (34) detects the rotation of the detected part (341) that rotates with the rotating shaft unit (30) including the input shaft (60) and the output body (8), and the detected part (341). And a detection unit (342).

  The detected part (341) is arranged between the control board (35) and the wall portion (40) on the other end side in the direction of the axis (600), or the control board (35) in the direction of the axis (600). ) Is placed in a position overlapping with.

  According to the first aspect, since the detected part (341) of the rotation detection part (34) is on the right side of the control board (35) (the other end side in the direction of the axis (600)), the inside of the case (4). It is difficult to occupy the space on the left side (one end side in the direction of the axis (600)) of the control board (35) in (1), and the space inside the case (4) can be effectively utilized.

  The second aspect is realized by a combination with the first aspect. In the second aspect, the input body (7) and the output body (8) are arranged so that the input body (7) is the outer side and the output body (8) is the inner side in a partial range in the direction of the axis (600). They overlap each other in the radial direction of the input shaft (6).

  The motor unit (3) further comprises a one-way clutch between the input body (7) and the output body (8) that overlap in the radial direction.

  The detected part (341) is attached to the input body (7) of the input body (7) and the output body (8) overlapping in the radial direction.

  The third aspect is realized by a combination with the second aspect. In the third aspect, the control board (35) is arranged at a position overlapping the one-way clutch in the direction of the axis (600).

  The fourth aspect is realized by a combination with the first to third aspects. In the fourth aspect, when viewed in the direction of the axis (600), the direction of a straight line passing through the axis of the rotation shaft (51) of the motor (5) and the axis of the input shaft body (60) is the first direction, The detection unit (342) is arranged at a position at least partially overlapping the input body (7) or the output body (8) in the first direction, or the input body (7) or the output body (in the first direction). It is arranged on the rotation shaft (51) side of the motor (5) with respect to 8).

  The fifth aspect is realized by a combination with the first to fourth aspects. In the fifth aspect, when the output body (8) is the first output body (8), the second output body (310) is housed in the case (4) and is different from the first output body (8). And a deceleration mechanism (31) housed in the case (4) for decelerating the rotation of the motor (5) and transmitting the decelerated rotation to the second output body (310). The control board (35) is a board. The face extends in a direction intersecting the axis (600) direction.

  The sixth aspect is realized by a combination with the fifth aspect. In the sixth aspect, the detected part (341) is disposed on the axis (600) direction on the reduction gear (311) of the reduction mechanism (31) and on the other end side of the case (4) in the axis (600) direction. It is arranged between the wall and the wall.

  The motor unit (3) of the seventh aspect includes a case (4), a motor (5) in which the rotating shaft (51) is housed in the case (4), an input shaft body (60), and an input body ( 7), an output body (8), a speed reduction mechanism (31), and a rotation detection unit (34). The input shaft body (60) passes through the case (4) in the direction of the axis (600) and is rotatably arranged around the axis (600). The input body (7) is arranged along the outer peripheral surface of the input shaft body (60) at one end side in the direction of the axis (600) and rotates integrally with the input shaft body (60). The output body (8) is rotatably arranged around the axis (600) along the outer peripheral surface on the other end side of the input shaft (60) in the direction of the axis (600), and is rotated by the input shaft (60). Receive. The speed reduction mechanism (31) is housed on the other end side of the input shaft body (60) in the direction of the axis (600) in the case (4), decelerates the rotation of the motor (5) and transmits it to the output body (8). To do. The rotation detector (34) detects the rotation of the detected part (341) that rotates with the rotating shaft unit (30) including the input shaft (60) and the output body (8), and the detected part (341). And a detection unit (342). The detected part (341) is arranged between the speed reduction mechanism (31) and the wall part (40) on the other end side of the case (4) in the axis (600) direction in the axis (600) direction.

  According to the seventh aspect, since the detected part (341) of the rotation detection part (34) is on the right side of the control board (35) (the other end side in the direction of the axis (600)), the inside of the case (4). It is difficult to occupy the space on the left side (one end side in the direction of the axis (600)) of the control board (35) in (1), and the space inside the case (4) can be effectively utilized.

  The motor unit (3) of the eighth aspect includes a case (4), a motor (5) in which the rotating shaft (51) is housed in the case (4), an input shaft body (60), and an input body ( 7), a first output body (8), a second output body (310), a reduction gear (311), and a rotation detector (34). The input shaft body (60) passes through the case (4) in the direction of the axis (600) and is rotatably arranged around the axis (600). The input body (7) is arranged along the outer peripheral surface of the input shaft body (60) at one end side in the direction of the axis (600) and rotates integrally with the input shaft body (60). The first output body (8) is arranged rotatably around the axis (600) along the outer peripheral surface on the other end side of the input shaft (60) in the axis (600) direction, Receives rotational force. The second output body (310) is arranged on the other end side of the case (4) in the direction of the axis (600) and outputs the output of the motor (5). The reduction gear (311) is housed in the case (4) on the other end side of the rotor (52) and the stator (53) of the motor (5) in the axis (600) direction of the input shaft body (60). , And decelerates the rotation of the motor (5) and transmits it to the second output body (310). The rotation detecting section (34) detects the rotation of the detected section (341) that rotates together with the rotating shaft unit (30) including the input shaft body (60) and the first output body (8), and the detected section (341). And a detection unit (342) for detecting. The detected part (341) is arranged between the reduction gear (311) and the wall (40) on the other end side of the case (4) in the axis (600) direction in the axis (600) direction. ..

  According to the eighth aspect, since the detected part (341) of the rotation detection part (34) is on the right side of the control board (35) (the other end side in the axis (600) direction), the inside of the case (4). It is difficult to occupy the space on the left side (one end side in the direction of the axis (600)) of the control board (35) in (1), and the space inside the case (4) can be effectively utilized.

  The electric bicycle (1) of the ninth aspect is realized by a combination with any one of the first to eighth aspects. The electric bicycle (1) of the ninth aspect includes any one of the first to eighth motor units (3).

  According to the ninth aspect, since the detected part (341) of the rotation detection part (34) is on the right side of the control board (35) (the other end side in the axis (600) direction), the inside of the case (4). It is difficult to occupy the space on the left side (one end side in the direction of the axis (600)) of the control board (35) in (1), and the space inside the case (4) can be effectively utilized.

DESCRIPTION OF SYMBOLS 1 Electric bicycle 3 Motor unit 30 Rotating shaft unit 31 Reduction gear mechanism 310 Second output body 34 Rotation detecting part 340 Rotating body 341 Detected part 342 Detection part 35 Control board 4 Case 40 Wall part 5 Motor 51 Rotating shaft 6 Input shaft 60 Input Shaft body 600 Axis 7 Input body 8 Output body

Claims (9)

A case,
A motor having a rotary shaft housed in the case,
An input shaft body that is arranged rotatably around the axis line through the case in the axial direction,
An input body arranged along an outer peripheral surface on one end side in the axial direction of the input shaft body, which rotates integrally with the input shaft body;
An output body that is arranged rotatably around the axis along an outer peripheral surface on the other end side of the input shaft in the axial direction, and receives a rotational force from the input shaft,
A control board arranged to be spaced apart from the wall portion on the other end side in the axial direction of the case, for controlling the motor;
A detection part that rotates together with a rotation shaft unit that includes the input shaft and the output part, and a rotation detection part that has a detection part that detects rotation of the detection part,
Equipped with
The detected unit is arranged between the control board and the wall portion on the other end side in the axial direction, or is arranged at a position overlapping the control board in the axial direction. In a part of the range in the axial direction, the input body and the output body are overlapped in the radial direction of the input shaft so that the input body is the outer side and the output body is the inner side,
Further comprising a one-way clutch between the input body and the output body that overlap in the radial direction,
The motor unit according to claim 1, wherein the detected portion is attached to the input body of the input body and the output body that overlap in the radial direction. The motor unit according to claim 2, wherein the control board is arranged at a position overlapping the one-way clutch in the axial direction. When the direction of a straight line passing through the axis of the rotary shaft of the motor and the axis of the input shaft is the first direction when viewed in the axial direction, the detection unit includes the input body or the input body in the first direction. At least one part is arrange | positioned with an output body, or it is arrange | positioned in the said 1st direction at the said rotating shaft side of the said motor rather than the said input body or the said output body. The motor unit according to one item. When the output body is the first output body,
A second output body housed in the case and different from the first output body;
A deceleration mechanism housed in the case, decelerating the rotation of the motor and transmitting the decelerated rotation to the second output body;
Further equipped with,
The motor unit according to claim 1, wherein the control board extends in a direction in which a board surface intersects the axial direction. The motor unit according to claim 5, wherein the detected portion is arranged between the reduction gear of the reduction mechanism and a wall portion of the case on the other end side in the axial direction in the axial direction. A case,
A motor having a rotary shaft housed in the case,
An input shaft body that is arranged rotatably around the axis line through the case in the axial direction,
An input body arranged along an outer peripheral surface on one end side in the axial direction of the input shaft body, which rotates integrally with the input shaft body;
An output body that is arranged rotatably around the axis along an outer peripheral surface on the other end side of the input shaft in the axial direction, and receives a rotational force from the input shaft,
A reduction mechanism that is housed on the other end side of the input shaft in the axial direction in the case and that reduces the rotation of the motor and transmits the rotation to the output.
A detection part that rotates together with a rotation shaft unit that includes the input shaft and the output part, and a rotation detection part that has a detection part that detects rotation of the detection part,
Equipped with
The detected unit is arranged in the axial direction between the reduction mechanism and the wall portion of the case on the other end side in the axial direction. A case,
A motor having a rotary shaft housed in the case,
An input shaft body that is arranged rotatably around the axis line through the case in the axial direction,
An input body that is arranged along an outer peripheral surface of the input shaft body at one end side in the axial direction, and that rotates integrally with the input shaft body;
A first output body that is disposed rotatably around the axis along an outer peripheral surface on the other end side of the input shaft in the axial direction, and receives a rotational force from the input body;
A second output body that is arranged on the other end side of the case in the axial direction and outputs the output of the motor;
In the case, a reduction gear that is housed on the other end side of the input shaft body in the axial direction with respect to the rotor and the stator of the motor and that reduces the rotation of the motor and transmits the rotation to the second output body.
A rotation detection unit having a detected portion that rotates together with a rotary shaft unit that includes the input body and the first output body, and a detection portion that detects rotation of the front detected portion,
Equipped with
The detected unit is arranged in the axial direction between the reduction gear and the wall portion of the case on the other end side in the axial direction. An electric bicycle comprising the motor unit according to claim 1.

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