JP2010213464A - Electric motor with reducer for wiper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor with a reducer for a wiper that oscillatingly rotates an output shaft at various angles in accordance with the type of vehicle in spite of using worm wheels having the same shape and is mountable to a plurality of vehicles having different wiper arm stop positions. <P>SOLUTION: A front face 23b of a worm wheel 23 is formed with concave mounting grooves (23d, 23e, 23f, and 23g) radially formed toward the radial outside. Each inner wall of the mounting grooves (23d, 23e, 23f, and 23g) is provided with a plurality of mounting means (23h, 23h, and 23h), respectively, whose distance from the center of an insertion hole provided at the center of the worm wheel is different from each other. A coupling member 24 and any one mounting means 23h of the mounting means (23h, 23h, and 23h) are coupled to each other so that the coupling member is mounted on the inner wall of each mounting groove (23d, 23e, 23f, and 23g). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric motor with a reduction gear for a wiper used as a drive device that swings a wiper arm provided in a vehicle or the like.

  The electric motor with a reduction gear for a wiper shown as a conventional example in FIG. 5 is used as a drive device that swings a wiper (not shown) provided in a vehicle or the like. The electric motor 100 with a speed reducer includes an electric motor 110 and a speed reducer 120 to which the electric motor 110 is attached. And the attachment part (arm head) of the wiper arm (not shown) with which the wiper is equipped is attached to the output shaft 127 provided in the reduction gear 120 of the electric motor 100 with a reduction gear, and a wiper is an electric motor with a reduction gear. The motor 100 is oscillated by the oscillating rotation of the output shaft 127 of the motor 100.

  The electric motor 110 is made of a magnetic material, and includes a bottomed cylindrical motor housing 111 and an armature 113 that is rotatably disposed inside the motor housing 111 and has a rotating shaft 113a.

  The motor housing 111 has a cylindrical yoke portion 111a and a bottom portion 111b that forms the bottom of the motor housing 111. A plurality of magnets 112 are attached to the inner wall of the yoke portion 111a, and an armature is attached to the bottom portion 111b. One end 113e of a rotating shaft 113a provided in 113 is pivotally supported.

  The armature 113 includes a pencil-shaped rotary shaft 113a, an armature core 113b attached to the rotary shaft 113a and including a plurality of teeth 113f, and an armature coil 113c wound around the teeth 113f provided in the armature core 113b. And a commutator 113d attached to the rotary shaft 113a at a position close to the armature core 113b. A worm 116 is integrally formed with the rotating shaft 113b at the other end 113g of the rotating shaft 113a. The armature core 113b is formed by laminating a plurality of thin plate-like magnetic materials.

  A brush housing portion 111c having an inner diameter larger than that of the yoke portion 111a is integrally formed on the opening side of the motor housing 111. Refraction-shaped plate springs 114 and 114 are disposed on the inner wall of the brush housing portion 111c. . The leaf spring 114 is attached with a brush 115 that is in sliding contact with the commutator 113d. Then, a current from an external power source is supplied to the armature coil 113c of the armature 113 via the leaf spring 114, the brush 115, and the commutator 113d.

  Next, the speed reducer 120 to which the electric motor 110 is attached will be described. The speed reducer 120 includes a bottomed bathtub-shaped gear case 121 made of a resin material, and a worm wheel 123, a power transmission member 125, a connecting plate 126, and a pinion gear 128 disposed inside the gear case 121.

  A cylindrical worm wheel shaft 122 made of a metal material is attached to the bottom 121a of the bathtub-shaped gear case 121, and the worm wheel 123 is rotatably attached to the worm wheel shaft 122. The worm wheel 123 is disposed at a position where the spur teeth 116 a formed on the outer wall of the worm 116 and the outer teeth 123 a formed on the outer wall of the worm wheel 123 mesh with each other.

  Thus, the flat teeth 116a formed on the worm 116 and the external teeth 123a formed on the worm wheel 123 mesh with each other, whereby the rotation of the armature 113 provided in the electric motor 110 is rotated from the rotation shaft 113a. The worm 116 and the worm wheel 123 are sequentially transmitted to the worm 116, and the worm wheel 123 is rotated by the rotation of the armature 113. The rotation of the worm wheel 123 is decelerated between the external teeth 116 a formed on the worm 116 and the flat teeth 123 a formed on the worm wheel 123.

  As shown in FIG. 6, a convex connecting portion 124 is integrally formed on the worm wheel 123 from the insertion hole 123 b formed at the center of the worm wheel 123 toward the radially outer side. 124a is formed. The connection hole 124a is formed at a position offset from the insertion hole 123b of the worm wheel 123, and the amount of this offset is a distance D from the center line L1 of the insertion hole 123b to the center line L2 of the connection hole 124a. The connection hole 124 a moves around the circumference having the distance D as a radius by the rotation of the worm wheel 123.

  The power transmission member 125 formed of a flat plate-shaped metal material includes a long plate portion 125b and a fan-shaped sector gear portion 125c integrally formed with the plate portion 125b. Flat teeth 125f are formed on the outer wall of the sector gear portion 125c, and a sector gear shaft 125d is attached to the center of the pitch circle of the flat teeth 125f. A connecting shaft 125a is attached to the end 125e of the plate portion 125b.

  The connecting shaft 125 a provided in the power transmission member 125 is slidably fitted into a connecting hole 124 a formed in the worm wheel 123, and the connecting shaft 125 a has a distance D as a radius by the rotation of the worm wheel 123. Move on the circumference.

  An output shaft 127 is attached to the pinion gear 128, and a connection plate 126 is disposed between the sector gear shaft 125 d provided in the power transmission member 125 and the output shaft 127 attached to the pinion gear 128. The sector gear shaft 125d is slidably fitted in the insertion hole 126b formed in one end 126a of the plate 126, and the output shaft 127 slides in the insertion hole 126d formed in the other end 126c of the connecting plate 126. It is freely combined

  As described above, the connecting plate 126 is disposed between the sector gear shaft 125d and the output shaft 127, whereby the distance between the sector gear shaft 125d and the output shaft 127 is kept constant. Therefore, the flat teeth 125g formed on the outer wall of the sector gear portion 125c and the flat teeth 125h formed on the outer wall of the pinion gear 128 are in contact with each other in a predetermined meshing state and do not leave.

  Next, the operation of the electric motor 100 with a speed reducer will be described. The connecting shaft 125a and the sector gear shaft 125d are connected by a plate portion 125b provided in the power transmission member 125, and the sector gear shaft 125d and the output shaft 127 are connected by a connecting plate 126. Therefore, as described above, when the connecting shaft 125a provided in the power transmission member 125 moves on the circumference having the distance D about the worm wheel shaft 122 as a radius by the rotation of the worm wheel 123, the power is increased. The transmission member 125 and the connection plate 126 perform a link operation in which the angle of each other increases or decreases.

  The power transmission member 125 and the connecting plate 126 perform a link operation, and at the same time, the flat teeth 125g formed on the sector gear portion 125c and the flat teeth 125h formed on the outer wall of the pinion gear 128 are in contact with each other in a predetermined meshing state. . Therefore, the pinion gear 128 swings and rotates by the link operation between the power transmission member 125 and the connecting plate 126.

  In the swinging rotation of the pinion gear 128 described above, when the worm wheel 123 rotates and the distance between the connecting shaft 125a and the output shaft 127 becomes the largest, the pinion gear 128 rotates the most in one direction, and the connecting shaft 125a When the distance between the shafts of the output shaft 127 becomes the smallest, the pinion gear 128 rotates the most in the other direction opposite to the one direction.

  Thus, the rotation of the worm wheel 123 causes the pinion gear 128 and the output shaft 127 attached to the pinion gear 128 to swing and rotate so that the rotation direction is switched alternately between one direction and the other direction. As the output shaft 127 swings and rotates, the wiper arm attached to the output shaft 127 swings.

  The electric motor 100 with a speed reducer is mounted on various types of vehicles as a drive device that swings the wiper arm, and the wiper angle of the wiper arm that is swung by the electric motor 100 with the speed reducer varies depending on the vehicle type. Therefore, the output shaft 127 provided in the electric motor 100 with a speed reducer needs to swing and rotate at various angles according to the vehicle on which it is mounted. That is, it is required to vary the swing angle of the output shaft 127.

  As shown in FIG. 6, the swing angle of the output shaft 127 increases or decreases the distance D between the center line L1 of the insertion hole 123b of the worm wheel 123 and the center line L2 of the connection hole 124a into which the connection shaft 125a is inserted. Can be adjusted. The swing angle of the output shaft 127 can be adjusted by increasing the distance D to increase the swing angle and decreasing the distance D to decrease the swing angle.

  Further, the wiper mounted on the vehicle is in a reversal position where the wiper arm is reversed from one direction to the other direction so as not to obstruct the driver's field of view after the operation of the wiper is turned off by an operation command switch or the like. It is required to be stopped. Therefore, the output shaft 127 provided in the electric motor 100 with a speed reducer to which the wiper is attached is required to be stopped at the reverse position after the operation of the wiper is turned off.

  Therefore, as shown in FIG. 5, three contact plates (130a, 130b, 130c) made of a conductive material are provided at the position where the worm wheel 123 of the bottom 121a of the gear case 121 is disposed. As shown in FIGS. 5 and 7, a relay plate 129 made of a conductive material is attached to the back surface 123 c of the worm wheel 123.

  The contact plate 130b and the relay plate 129 are always in contact with each other when the worm wheel 123 is rotated. On the other hand, the contact plate 130a and the relay plate 129 are in a non-contact state once by a predetermined angle when the worm wheel 123 rotates once, and the contact plate 130c and the relay plate 129 are predetermined when the worm wheel 123 rotates once. It will be in a contact state once only the angle.

  Next, since the relay plate 129 and the contact plates (130a, 130b, 130c) are provided, the output shaft provided in the electric motor 100 with a speed reducer after the operation of the wiper is turned off by an operation command switch or the like. It will be described that 127 stops at a predetermined reverse position.

  When a command to turn off the operation of the wiper by an operation command switch or the like is issued from the outside while the electric motor 100 with a speed reducer is operating, that is, while the worm wheel 123 is rotating, the armature coil 113c, contact, An electric circuit is formed to the plate 130b, the relay plate 129, the contact plate 130a, and the ground, and an electric current is supplied from the outside to the armature coil 113c provided in the electric motor 100 by this electric circuit. Rotate to a position where 130a and relay plate 129 are in a non-contact state.

  When the contact plate 130a and the relay plate 129 are brought into a non-contact state due to the rotation of the worm wheel 123, the contact plate 130c and the relay plate 129 are brought into a contact state without delay thereafter. When the contact plate 130c and the relay plate 129 come into contact with each other, a closed circuit electric circuit is formed from the armature coil 113c, the contact plate 130c, the relay plate 129, and the contact plate 130b to the armature coil 113c in order.

  When an electric circuit of a closed circuit including the armature coil 113c is formed in this manner, a so-called armature short state is established. A braking current flows through the armature coil 113c, and the armature 113 provided with the armature coil 113c includes Power generation braking force is applied. Due to the power generation braking force acting on the armature 113, the armature 113 stops rotating, and after the operations of the output shaft 127 and the wiper are turned off, the armature 113 is stopped at a predetermined reverse position.

  As described above, when the distance between the coupling shaft 125a and the output shaft 127 becomes the largest, the pinion gear 128 rotates the largest in one direction, and the distance between the coupling shaft 125a and the output shaft 127 becomes the smallest. The pinion gear 128 rotates most greatly in the other direction opposite to the one direction. That is, the reverse position is when the distance between the coupling shaft 125a and the output shaft 127 is the largest, or when the distance between the coupling shaft 125a and the output shaft 127 is the largest.

  In order to stop the wiper arm at the reverse position, the rotation mounting position of the relay plate 129 with respect to the worm wheel 123 is a position where the worm wheel 123 stops at a position where the distance between the coupling shaft 125a and the output shaft 127 is the largest. Alternatively, of the two positions where the worm wheel 123 stops at the position where the distance between the connecting shaft 125a and the output shaft 127 is the smallest, the number is limited to one according to the setting of the vehicle provided with the wiper arm (for example, Patent Document 1). reference).

JP-A-10-157474

  However, in the above-described prior art, the output shaft 127 provided in the electric motor 100 with a speed reducer needs to swing and rotate at various angles according to the vehicle type. For this reason, it is required to increase or decrease the distance D between the insertion hole 123b into which the worm wheel shaft 7 is inserted and the connection hole 124a into which the connection shaft 125a is inserted in accordance with the vehicle type. Therefore, it is necessary to design and manufacture various types of worm wheels in which the distance D is changed for each vehicle type, and the development cost and manufacturing cost of the worm wheel are expensive.

  Further, as described above, the rotational mounting position of the relay plate 129 with respect to the worm wheel 123 is the position where the worm wheel 123 stops at the position where the distance between the coupling shaft 125a and the output shaft 127 is the largest, or the coupling shaft 125a. Of the two positions where the worm wheel 123 stops at the position where the inter-axis distance of the output shaft 127 becomes the smallest, the number is limited to one according to the setting of the vehicle.

  Therefore, depending on the setting of the vehicle, the rotation mounting position of the relay plate 129 is not only the position where the worm wheel 123 is stopped at the position where the distance between the axes becomes the largest, but also the position where the distance between the axes becomes the smallest. When the position is set to stop the worm wheel 123, it is necessary to design and manufacture the worm wheel 123 accordingly. As a result, the manufacturing cost of the worm wheel 123 is further expensive.

  Accordingly, the present invention has been made in view of the above-described circumstances, and in spite of the use of the worm wheel having the same shape, the output shaft is oscillated and rotated at various angles according to the vehicle type. The present invention provides an electric motor with a reduction gear for a wiper that can be mounted on a plurality of vehicles having different wiper arm stop positions.

  According to a first aspect of the present invention, there is provided an electric motor with a reduction gear for a wiper, wherein a motor housing, a plurality of magnets attached to an inner wall of the motor housing, and a worm are integrally formed so as to be rotatable inside the motor housing. An electric motor provided with an armature having a rotating shaft, a gear case formed in a bottomed bathtub shape, to which the electric motor is attached, and a worm provided in the electric motor is inserted inside, and disposed inside the gear case A worm wheel that is formed in a disk shape, has an insertion hole in the center, is rotatably supported by a worm wheel shaft attached to the bottom of the motor case through the insertion hole, and meshes with the worm, and a worm wheel A connecting member arranged on the front surface and having a connecting hole, a plate portion and a plate A power transmission member having a sector gear portion integrally formed at one end of the plate, and a first pin inserted into a connecting hole provided in the connecting member, the other end of the plate portion being pivotally supported by the connecting member; A pinion gear meshed with a sector gear portion provided in the power transmission member and having an output shaft attached thereto, and one end pivotally supported on the output shaft formed in a longitudinal shape and attached to the pinion gear, and the second pin In the electric motor with a reduction gear for a wiper provided with a reduction gear having a sector gear portion and a connecting plate on which the other end is pivotally supported, the front surface of the worm wheel is formed radially outward. A plurality of attachment means having different distances from the center of the insertion hole provided in the center of the worm wheel on the inner wall of the attachment groove. Provided, the connecting member is either one of the attachment means of the plurality of attachment means are coupled to one another, it is attached to the inner wall of the mounting groove.

  The connecting member provided in the reduction gear can be selectively coupled to any one of the plurality of attachment means provided in the attachment groove of the worm wheel. Therefore, the distance from the center of the insertion hole provided at the center of the worm wheel to the connecting member can be selectively increased or decreased, and the swing angle of the output shaft of the electric motor with the wiper reduction gear is selectively increased or decreased. be able to. Therefore, it is possible to swing and rotate the output shaft at various swing angles in accordance with the vehicle type with one type of worm wheel having the same shape.

  The electric motor with a reduction gear for a wiper according to claim 2 of the present invention is the electric motor with a reduction gear for a wiper according to claim 1, wherein a plurality of the mounting grooves are formed in the worm wheel, The connecting member is attached to any one of the plurality of attachment grooves formed in the worm wheel, and the bottom of the gear case where the worm wheel is disposed is formed of a conductive material. A plurality of electrical terminals provided in close proximity to each other, the back surface of the worm wheel is formed in a substantially annular shape by a thin plate conductive material, is in sliding contact with the electrical terminals, and a part of the annular shape A relay plate integrally formed with an energization control unit for controlling energization between the electrical terminals is integrally attached to the electrical terminal and the relay plate. The worm wheel and the power supply controller being kicked Bei substantially overlapping positions from each other to stop the rotation.

  The connecting member provided in the reduction gear can be selectively attached to any one of the plurality of attachment grooves provided in the worm wheel. Therefore, even if the plurality of electrical terminals overlap with the energization control unit integrally formed on a part of the annular shape of the relay plate, even if the worm wheel stops rotating at a predetermined position, the connecting member is It is possible to stop at a free position selectively.

  The stop position of the wiper arm attached to the output shaft of the electric motor with the wiper reduction gear is determined by the stop position of the connecting member. Since the stop position of the wiper arm can be selectively stopped at a free position, the stop position of the wiper arm can be freely set without increasing the type of worm wheel.

  According to the present invention, the swing angle of the output shaft of the electric motor with a wiper reduction gear can be selectively increased or decreased. Therefore, the output shaft to which the wiper arm is attached can be swung and rotated at various angles according to the vehicle type by using the worm wheel having the same shape without using several types of worm wheels.

  Since the stop position of the wiper arm can be selectively stopped at a free position, the stop position of the wiper arm can be freely set without increasing the type of worm wheel. For this reason, the worm wheel having the same shape can be mounted on a plurality of vehicles having different wiper arm stop positions without using several types of worm wheels.

It is sectional drawing of the electric motor with the reduction gear for wipers in embodiment of this invention. It is a back view of the worm wheel in the embodiment of the present invention. It is a perspective view which shows attachment of the connection member to the worm wheel in embodiment of this invention. It is a front view of the worm wheel in the embodiment of the present invention. It is sectional drawing of the electric motor with the reduction gear for wipers in a prior art example. It is a perspective view of the worm wheel in a prior art example. It is a perspective view of the worm wheel seen from the A direction in FIG.

    Next, an electric motor with a reduction gear for wiper according to an embodiment of the present invention will be described with reference to FIG. An electric motor with a reduction gear for a wiper (hereinafter referred to as “electric motor with a reduction gear”) 1 shown in FIG. 1 is provided in a vehicle, and drives to swing a wiper (not shown) that wipes a window glass of the vehicle. Used as a device. The electric motor 1 with a speed reducer includes an electric motor 10 and a speed reducer 20 to which the electric motor 10 is attached. An arm head (attachment portion) of a wiper arm (not shown) provided in the wiper is attached to an output shaft 27 provided in the reducer 20, and the wiper is swung by the electric motor 1 with a reducer. The

  The electric motor 10 is made of a magnetic material, and includes a bottomed cylindrical motor housing 111 and an armature 13 rotatably disposed inside the motor housing 11 and having a rotating shaft 13a.

  The motor housing 11 has a cylindrical yoke portion 11a and a bottom portion 11b. A plurality of magnets 12 are attached to the inner wall of the yoke portion 11a, and a rotary shaft provided in the armature 13 is attached to the bottom portion 11b. One end 13e of 13a is pivotally supported.

  The armature 13 includes a rod-shaped rotating shaft 13a, an armature core 13b attached to the rotating shaft 13a and including a plurality of teeth 13f, and an armature coil 13c wound around the teeth 13f included in the armature core 13b. And a commutator 13d attached to the rotary shaft 13a at a position close to the armature core 13b. A worm 16 is integrally formed with the rotary shaft 13b at the other end 13g of the rotary shaft 13a.

  A brush housing portion 11c having a larger inner diameter than the yoke portion 11a is integrally formed on the opening side of the motor housing 11, and refractive springs 14 and 14 are disposed on the inner wall of the brush housing portion 11c. . The leaf spring 14 is attached with a brush 115 that is in sliding contact with the commutator 13d.

  Next, the speed reducer 20 to which the electric motor 10 is attached will be described. The speed reducer 20 includes a bottomed bathtub-shaped gear case 21 formed by aluminum die casting, and a worm wheel 23, a power transmission member 25, a connecting plate 26, and a pinion gear 28 disposed inside the gear case 21.

  A cylindrical worm wheel shaft 22 made of a metal material is attached to the bottom 21a of the bathtub-shaped gear case 21. The worm wheel shaft 22 is made of a resin material, and the disk-shaped worm wheel 23 rotates. It is attached freely. The worm wheel 23 is arranged at a position where the spur teeth 16 a formed on the outer wall of the worm 16 and the outer teeth 23 a formed on the outer wall of the worm wheel 23 mesh with each other.

  As described above, the spur teeth 16a formed on the worm 16 and the external teeth 23a formed on the worm wheel 23 mesh with each other, whereby the rotation of the armature 13 provided in the electric motor 10 is applied to the rotating shaft 13a. The formed worm 16 is transmitted to the worm wheel 23, and the worm wheel 23 is rotated by the rotation of the armature 13. The rotation of the worm wheel 23 is decelerated between the external teeth 16 a formed on the worm 16 and the flat teeth 23 a formed on the worm wheel 23.

  On the front surface 23 b of the worm wheel 23, a substantially cylindrical connecting member 24 having an insertion hole 24 a formed at the center is disposed, and the worm wheel 123 rotates and moves on a predetermined circumference. The details of the shape and the like of the worm wheel 23 and the connecting member 24 will be described later.

  The power transmission member 25 formed of a flat plate-shaped metal material includes a long plate portion 25b and a sectoral sector gear portion 125c integrally formed with the plate portion 25b, and is integrally formed with the plate portion 125b. A sector gear shaft (second pin) 25d is attached to the center of the pitch circle formed on the outer wall of the sector gear portion 125c. A connecting shaft (first pin) 25a is attached to the end 25e of the plate portion 125b.

  A connecting shaft (first pin) 25a provided in the power transmission member 125 is slidably fitted into an insertion hole 24a formed in the connecting member 24 disposed on the front surface 23b of the worm wheel 23. ing.

  An output shaft 27 is attached to the pinion gear 28, and a connecting plate is provided between the sector gear shaft (second pin) 25 d provided in the power transmission member 25 and the output shaft 27 attached to the pinion gear 28. The sector gear shaft 25d is slidably fitted in the insertion hole 26b formed in one end 26a of the connection plate 26, and the insertion hole 26d formed in the other end 26c of the connection plate 26 is inserted in the insertion hole 26d. The output shaft 27 is slidably fitted.

  As described above, the connecting plate 26 is disposed between the sector gear shaft (second pin) 25d and the output shaft 27, whereby the distance between the sector gear shaft 125d and the output shaft 27 is kept constant. Therefore, the flat teeth 25f formed on the outer wall of the sector gear portion 25c and the flat teeth 25h formed on the outer wall of the pinion gear 128 abut in a predetermined meshing state without leaving.

  Next, operation | movement of the reduction gear 20 with which the electric motor 1 with a reduction gear is equipped is demonstrated. The connecting shaft (first pin) 25 a attached to the end 25 e of the power transmission member 24 rotates on the circumference around the insertion hole 23 c of the worm wheel 23 by the rotation of the worm wheel 23. By the rotational movement of the connecting shaft (first pin) 25a, the power transmission member 25 and the connecting plate 26 that are rotatably connected to each other by the sector gear shaft (second pin) perform a link operation.

  In this link operation, a movement in which the relative angle between the power transmission member 25 and the connecting plate 26 increases and decreases due to the rotation of the connecting shaft (first pin) 25a is continuously repeated. When the connecting shaft (first pin) 25a rotates once, a series of movements in which the relative angle increases and decreases is performed once.

  By the link operation of the power transmission member 25 and the connecting plate 26, the sector gear portion 25c of the power transmission member 25 rotates and rotates around the sector gear shaft (second pin) 25d. As the sector gear portion 25c swings and rotates, the pinion gear 28 and the output shaft 28 attached to the pinion gear 28 swing and rotate. The swing rotation of the output shaft 28 is a swing rotation that reciprocates once when the connecting shaft (first pin) 25a rotates once. That is, when the worm wheel 23 to which the connecting shaft (first pin) 25a is attached rotates once, the output shaft 28 reciprocates once.

  In this way, the output shaft 27 swings and rotates by the rotation of the worm wheel 23, and the wiper attached to the output shaft 27 swings and moves by the swing rotation of the output shaft 27. Further, the wiper attached to the output shaft 27 oscillates by the oscillation rotation of the output shaft 27, and the oscillation motion of the wiper is also a reciprocating motion when the worm wheel 23 makes one rotation.

  As shown in FIG. 1, the bottom 21a of the gear case 21 where the worm wheel 23 is disposed is provided with three contact plates (30a, 30b, 30c) made of a conductive material, and the contact plates (30a, 30b). , 30c) are formed with contacts (31a, 31b, 31c). As shown in FIGS. 1 and 2, an annular relay plate 29 made of a thin plate-like conductive material is attached to the back surface 23 i of the worm wheel 23.

  A portion of the relay plate 29 is punched with a conductive material, and a punched portion (energization control portion) 29a in which no conductive material exists, and a protruding portion that protrudes outward in the radial direction and is integrally formed with the relay plate 29. (Energization control unit) 29b is formed. The protrusion 29b is formed at a position radially outside the position where the punched portion 29a is formed. And in the worm wheel 23, the exposed part 23j which the back surface 23i of the worm wheel 23 exposes is formed in the part in which the punching part (energization control part) 29a is arranged.

  The contact plate 30a is disposed at a position where the contact 31a formed on the contact plate 30a contacts the relay plate 29 and the exposed portion 23j when the worm wheel 23 rotates. The contact plate 30b is disposed outside the contact plate 30a with respect to the worm wheel shaft 22, and the contact 31b formed on the contact plate 30b is always in contact with the relay plate 29 when the worm wheel 23 rotates. Is arranged. The contact plate 30c is disposed outside the contact plate 30b with respect to the worm wheel shaft 22, and when the worm wheel 23 rotates, the contact 31b formed on the contact plate 30b is connected to the back surface 23i of the worm wheel 23. The relay plate 29 is disposed at a position in contact with the protruding portion 29b.

  Since the contact plates (30a, 30b, 30c) are disposed at the above positions, the contact 31b of the contact plate 30b and the relay plate 29 are always in contact when the worm wheel 23 rotates.

  On the other hand, when the worm wheel 23 makes one rotation, the contact 30a of the contact plate 30a once contacts the exposed portion 23j, and the contact 30a and the relay plate 29 are intermittently in a non-contact state only once. Similarly, when the worm wheel 23 makes one rotation, the contact 30c of the contact plate 30 once contacts the protrusion 29b formed integrally with the relay plate 29, and the contact 30c and the relay plate 29 contact intermittently only once. It becomes a state.

  The timing at which the contact 30a and the relay plate 29 are in a non-contact state and the timing at which the contact 30c and the relay plate 29 are in a contact state are set to substantially the same timing.

  Next, the relay plate 29 in which the punching portion (energization control portion) 29a and the protruding portion (energization control portion) 29b are formed, and the contact plate (30a, 30b, 30c) in which the contacts (31a, 31b, 31c) are formed. The operation of the electric motor 1 with a speed reducer will be described.

  When a command signal for turning off the operation of the wiper is supplied to the electric motor 1 with a reduction gear while the electric motor 1 with the reduction gear is operating, that is, while the worm wheel 23 is rotating, the armature coil 13c, The contact plate 30a, the relay plate 29, the contact play 30b, and an electric circuit connected to the ground are formed. Then, current is supplied from an external power source to the armature coil 13c provided in the electric motor 10 by this electric circuit, and the armature 13 is in a position where the contact plate 30a and the relay plate 29 are in a non-contact state, that is, the contact The contact point 31a of the plate 30a rotates to a position where it abuts on the exposed portion 23j.

  Then, when the contact plate 30a and the relay plate 29 are in a non-contact state and the current of the armature coil 13c is not supplied from the external power supply, the contact 31c of the contact plate 30c and the protruding portion 29b come into contact without delay thereafter. The contact plate 30a and the relay plate 29 are in contact with each other. When the contact plate 30a and the relay plate 29 come into contact with each other, a closed circuit is formed in turn from the armature coil 13c, the contact plate 30c, the relay plate 29, and the contact plate 30b to the armature coil 13c.

  When the electric circuit of the closed circuit including the armature coil 13c is formed in this way, the electric motor 10 is in a so-called armature short state, a braking current flows through the armature coil 113c, and the armature coil 113c is provided by the braking current. A power generation braking force is applied to the armature 113. The rotational speed of the armature 113 is reduced by the power generation braking force acting on the armature 113, and the worm wheel 23 stops rotating at a position where the contact plate 30c and the protruding portion 29b come into contact with each other.

  Next, based on FIG. 3 and FIG. 4, the detail of the structure of the connection member 24 attached to the worm wheel 23 and the worm wheel 23 is demonstrated.

  On the front surface 23b of the worm wheel 23, first to fourth mounting grooves (23d, 23e, 23f, 23g) having a concave shape formed radially outward are formed. In FIG. 4, the center line C1 indicates the radial center of the first and second mounting grooves (23d, 23e), and the center line C2 indicates the third and fourth mounting grooves (23f, 23g). The center in the radial direction is shown.

  The second mounting groove 23e is disposed at a position 180 ° opposite to the first mounting groove 23d across the insertion hole 23c formed in the worm wheel 23, and the fourth mounting groove 23g is the third mounting groove 23g. It is arranged at a position facing the groove 23f at 180 ° across the insertion hole 23c formed in the worm wheel 23.

  The third mounting groove 23f is disposed at a position spaced apart from the first mounting groove 23d by a predetermined angle α. Similarly, the fourth mounting groove 23g is disposed at a position spaced apart by a predetermined angle α with respect to the second mounting groove 23e, and the angle α is set to 50 degrees in the present embodiment. .

  Three recessed mounting means (23h, 23h, 23h) are provided on the inner walls of the first to fourth mounting grooves (23d, 23e, 23f, 23g). The distances R are different from the center O1 of the insertion hole 23c provided at the center of the worm wheel 23 to the three attachment means (23h, 23h, 23h), and the three attachment means (23h, 23h, 23h) are separated from the center O1. Are formed at positions R = R1, R = R2, and R = R3, respectively.

  The connecting member 24 has an annular shape with an insertion hole 24a formed at the center, and two convex fastening portions (24b, 24b) extending in the axial direction are integrally formed on the outer wall. The two fastening portions (24b, 24b) are formed at positions facing each other by 180 degrees with the insertion hole 24a interposed therebetween.

  The connecting member 24 is attached to any one of the four attachment grooves (24d, 24e, 24f, 24g). In the present embodiment, the first mounting groove 24d is bonded and fixed with an adhesive. The connecting member 24 is formed on the connecting member 24 with any one attaching means 23h selected from three attaching means (23h, 23h, 23h) formed on the inner wall of the first attaching groove 24d. The fastening portions 24b are coupled to each other and attached to the inner wall of the attachment groove 24d. In the present embodiment, the connecting member 24 is attached to the attachment means 23h in which the distance R from the center O1 of the insertion hole 23c provided in the worm wheel 23 is R = R3.

  In the present embodiment, the connecting member 24 is either one of the first or second mounting grooves (23d, 23e) formed at positions facing each other by 180 ° with the insertion hole 23c formed in the worm wheel 23 interposed therebetween. The connecting member 24 can be attached by selecting.

  As described above, the worm wheel 23 stops rotating at a position where the contact plate 30c and the protrusion 29b come into contact with each other. Then, depending on the circumferential position of the connecting member 24 when the worm wheel 23 stops rotating, the position where the rotation of the rotating output shaft 27 stops, that is, the wiper attached to the rotating shaft 27 swings. The position where the exercise stops can be changed.

  In general, since the wiper does not block the passenger's field of view, the electric motor 1 with a reduction gear needs to be set to stop the wiper in the vicinity of the edge of the window glass of the vehicle at the wiper inversion position. There are two inversion positions in the swinging movement of the wiper. One of the inversion positions is called a so-called “upper inversion position” and the other is called a so-called “lower inversion position”. And the stop position of this wiper changes with the vehicle models to which the electric motor with a reduction gear is attached.

  Therefore, the electric motor 1 with a speed reducer according to the present embodiment is a worm wheel 23 having the same shape without using several types of worm wheels separately, and is in one of the “upper reverse position” and the “lower reverse position”. The swinging motion of the wiper can be stopped at the reverse position.

  Furthermore, in the present embodiment, either the first mounting groove 23d or the third mounting groove 23f disposed at a position spaced apart from the first mounting groove 23d by a predetermined angle α is used. Optionally, the connecting member 24 can be attached to the worm wheel 23. Similarly, either the second mounting groove 23e or the fourth mounting groove 23g arranged at a predetermined angle α away from the second mounting groove 23e is selected and connected. The member 24 can be attached to the worm wheel 23.

  For this reason, the electric motor 1 with a speed reducer has a predetermined shape with a worm wheel 23 having the same shape without using several types of worm wheels even when the mounting angle of the electric motor 1 with a speed reducer to the vehicle is different. The swinging motion of the wiper can be stopped at one of the “upside inversion position” and “down inversion position”.

  In the present embodiment, the connecting member 24 is attached by the attachment means 23h selected from the three attachment means (23h, 23h, 23h) formed on the inner wall of the attachment groove (24d, 24e, 24f, 24g). It is attached to the inner wall of the mounting groove (24d, 24e, 24f, 24g). As described above, the three attachment means (23h, 23h, 23h) are formed such that the distances R from the center O1 are R = R1, R = R2, and R = R3, respectively. Therefore, the distance d from the center O1 of the insertion hole 23c of the worm wheel 23 to the center O2 of the insertion hole 24a of the connecting member 24 can be changed.

  The distance d is the rotational radius of the circular motion of the connecting member 24 to which the power transmission member 25 is connected. By changing the distance d, the swing angle of the swinging output shaft 27 can be changed. Thereby, the swing angle of the wiper attached to the output shaft 27 can be changed.

  As described above, since the distance d from the center O1 of the insertion hole 23c of the worm wheel 23 to the center O2 of the insertion hole 24a of the connecting member 24 can be changed, without using several kinds of worm wheels separately, The swing angle of the wiper attached to the output shaft 27 can be changed by the worm wheel 23 having the same shape. Therefore, the electric motor 1 with a speed reducer according to the present embodiment can be applied to various vehicles having different wiper swing angles with a single worm wheel 23 without using a separate worm wheel.

DESCRIPTION OF SYMBOLS 1 Electric motor 10 with a reduction gear Electric motor 11 Motor housing 11a Yoke 12 Magnet 13 Armature 13a Rotating shaft 13b Armature core 13c Armature coil 13d Commutator 14 Leaf spring 15 Brush 16 Worm part 20 Reduction gear 21 Gear case 22 Worm wheel shaft 23 Worm wheel 23a Flat tooth 23b Front surface 23c Insertion hole 23d First attachment groove 23e Second attachment groove 23f Third attachment groove 23g Fourth attachment groove 23h Recess (attachment means)
23i Back surface 23j Exposed portion 24 Connection member 24a Insertion hole 24b Fastening portion 25 Power transmission member 25a Connection shaft (first pin)
25b Plate portion 25c Sector gear portion 25d Sector gear shaft (second pin)
25e End portion 25f Flat tooth 26 Connection plate 27 Output shaft 28 Pinion gear 29 Relay plate 29a Punching part (energization control part)
29b Protruding part (energization control part)
30 Contact Plate 30a Contact Plate 30b Contact Plate 30c Contact Plate 31a Contact 31b Contact 31c Contact

Claims (4)

A motor housing;
A plurality of magnets attached to the inner wall of the motor housing;
An electric motor including an armature that is rotatably arranged inside the motor housing and has a rotating shaft integrally formed with a worm;
A gear case that is formed into a bottomed bathtub shape, to which the electric motor is attached, and a worm provided in the electric motor is inserted inside;
Arranged inside the gear case, formed in a disc shape, provided with an insertion hole in the center, rotatably supported by a worm wheel shaft attached to the bottom of the motor case through the insertion hole, A worm wheel to be engaged,
A connecting member disposed on the front surface of the worm wheel and having a connecting hole;
A plate portion and a sector gear portion integrally formed at one end of the plate portion, and the other end of the plate portion is connected to the connecting member by a first pin inserted into the connecting hole provided in the connecting member. A power transmission member pivotally supported by
A pinion gear meshed with a sector gear portion provided in the power transmission member and attached with an output shaft;
A wiper comprising a reduction gear formed in a longitudinal shape and having one end pivotally supported on the output shaft attached to the pinion gear and having a connecting plate pivotally supported by the second pin on the sector gear portion and the other end In an electric motor with a reduction gear for
On the front surface of the worm wheel, a concave mounting groove formed radially outward is formed, and the inner wall of the mounting groove is provided at the center of the worm wheel. A plurality of attachment means having different distances from the center of the insertion hole are provided, and the connecting member is coupled to at least one of the attachment means and attached to the inner wall of the attachment groove. An electric motor with a reduction gear for wiper, characterized in that In the electric motor with a reduction gear for the wiper,
A plurality of the mounting grooves are formed in the worm wheel,
The connecting member is attached to any one of the plurality of attachment grooves formed in the worm wheel,
At the bottom of the gear case where the worm wheel is disposed, a plurality of electrical terminals formed of a conductive material are provided close to each other,
The back surface of the worm wheel is formed in a substantially annular shape by a thin conductive material, and an energization control unit that slides on the electric terminals and controls energization between the electric terminals is formed integrally with the worm wheel. 2. The worm wheel stops rotating at a position where the relay plate is integrally attached, and the electrical terminal and the energization control unit provided on the relay plate substantially overlap each other. An electric motor with a reduction gear for wiper described in 1. In the electric motor with a reduction gear for the wiper,
3. The wiper deceleration according to claim 2, wherein the number of the plurality of mounting grooves formed in the worm wheel is four, and the plurality of mounting grooves include first to fourth mounting grooves. 4. Electric motor with machine. In the electric motor with a reduction gear for the wiper,
The second mounting groove is disposed at a position facing the first mounting groove across the insertion hole formed in the worm wheel,
The fourth mounting groove is disposed at a position facing the third mounting groove across the insertion hole formed in the worm wheel,
3. The electric motor with a reduction gear for wiper according to claim 2, wherein the third mounting groove is disposed at a position spaced apart from the first mounting groove by a predetermined angle.

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