JP7451371B2 - linear drive device - Google Patents

Description

The present invention relates to a linear drive device that rotates a feed screw shaft to linearly move a movable body.

Conventionally, a motor has a feed screw shaft (lead screw) with a spiral groove formed on its outer circumferential surface, a movable body that moves linearly along the feed screw shaft, and a position that detects the origin position of the movable body in the direction of movement. A linear drive device including a detection mechanism is known (for example, see Patent Document 1). In the linear drive device described in Patent Document 1, the motor includes a rotor having a rotating shaft on which a feed screw shaft is formed and a driving magnet, and a stator having a driving coil and disposed on the outer circumferential side of the driving magnet. , and a frame fixed to the output side end of the stator.

In the linear drive device described in Patent Document 1, the frame includes a flat plate-shaped frame main body, a first support part rising at a right angle from the output side end of the frame main body, and a second support part rising at a right angle from the non-output side end of the frame main body. It consists of a support section. A bearing that supports the output side end of the feed screw shaft is attached to the first support portion. The second support part is fixed to the output side end surface of the stator. The movable body is arranged between the first support part and the second support part in the axial direction of the feed screw shaft.

Furthermore, in the linear drive device described in Patent Document 1, the motor includes a terminal pin to which a drive coil is electrically connected. One end of the terminal pin is soldered and fixed to the power supply board. A board holding member that holds the power supply board is attached to the stator. That is, the power supply board is attached to the stator via the board holding member. The position detection mechanism is attached to the power supply board and is disposed on the opposite output side of the movable body. The position detection mechanism detects the origin position of the movable body on the non-output side. Note that one end of a lead wire for electrically connecting the linear drive device to a predetermined host device on which the linear drive device is mounted is fixed to the power supply board, and the lead wire is pulled out from the power supply board. ing.

In addition, as a linear drive device that includes a motor having a feed screw shaft, a movable body that moves linearly along the feed screw axis, and a position detection mechanism that detects the origin position in the moving direction of the movable body, A linear drive device that detects the origin position on the output side is known (for example, see Patent Document 2). In the linear drive device described in Patent Document 2, the position detection mechanism is attached to the output side portion of the frame body. Further, the position detection mechanism is attached to the bottom side of the frame body.

JP2019-54648A JP 2018-54063 Publication

The inventor of the present application proposed a linear drive device in which a position detection mechanism is attached to the bottom side of the output side portion of the frame body and the origin position of the movable body is detected on the output side, as in the linear drive device described in Patent Document 2. In the device, the lead wire whose one end is connected to the position detection mechanism is routed from the position detection mechanism toward the power supply board toward the non-output side, and the lead wires drawn out from the power supply board and this lead wire are connected together to the connector. I am considering doing so.

In this case, if the position of the lead wire that is pulled out from the position detection mechanism and routed toward the non-output side varies, the lead wire may come into contact with the movable body that moves in the axial direction of the feed screw shaft, and the lead wire may Problems such as wire breakage may occur. Additionally, if the position of the lead wire that is pulled out from the position detection mechanism and routed toward the non-output side varies, when the linear drive device is attached to a host device, the lead wire may interfere with the components of the host device. There is also a possibility that some problems may occur.

Therefore, an object of the present invention is to suppress variations in the lead wire routing position even if the lead wire drawn out from the position detection mechanism that detects the position of the movable body on the output side is routed toward the opposite output side. The object of the present invention is to provide a possible linear drive device.

In order to solve the above problems, the linear drive device of the present invention includes a motor having a feed screw shaft, and a motor that engages with the feed screw shaft and moves linearly in the axial direction of the feed screw shaft when the feed screw shaft rotates. A movable body, a position detection mechanism for detecting the position of the movable body in the axial direction of the feed screw shaft, a lead wire drawn out from the position detection mechanism, and a holder for defining the drawing position of the lead wire, A predetermined direction perpendicular to the feed screw shaft is the first direction, one axial side of the feed screw shaft is the output side, the other axial side of the feed screw shaft is the counter-output side, and one side of the first direction is the second direction side and the other side of the first direction is the third direction side, the motor has a rotor having a driving magnet that rotates together with the feed screw shaft, a driving coil and a driving magnet. The frame includes a stator disposed on the outer peripheral side, an output side bearing that supports the output side portion of the feed screw shaft, and a frame that is fixed to the output side of the stator and holds the output side bearing. A flat bottom part constituting the three-direction side part, a bearing holding part that rises from the output side part of the bottom part toward the second direction side and holds the output side bearing, and a bearing holding part that holds the output side bearing from the opposite output side part of the bottom part. The movable body has a fixed part that rises toward the second direction and is fixed to the stator, the thickness direction of the bottom part coincides with the first direction, and the movable body holds the bearing in the axial direction of the feed screw shaft. and the fixed part, and the position detection mechanism is attached to the output side part of the bottom, which is the surface on the third direction side of the bottom part, and detects the position of the movable body on the output side, and detects the position of the movable body on the output side. The holder shall be routed along the bottom of the bottom part in the opposite direction to the output side, and the holder shall be fixed to the bottom part with a lead wire regulating part between which a part of the lead wire is disposed between the holder and the bottom part. It is characterized by

The linear drive device of the present invention includes a holder for defining the lead wire routing position, and the holder has a part of the lead wire disposed between the lead wire regulating part of the holder and the bottom part of the frame. It is fixed to the bottom of the frame in the upright position. Therefore, in the present invention, even if the lead wire pulled out from the position detection mechanism that detects the position of the movable body on the output side is routed toward the opposite output side, it is possible to suppress variations in the lead wire routing position. Become.

In the present invention, it is preferable that the holder is disposed on the opposite output side of the movable body when the movable body moves to the opposite end of the movable body. With this configuration, a part of the lead wire is arranged between the lead wire regulating part and the bottom part on the opposite output side of the movable body when it moves to the opposite end, and the position of the lead wire is changed. Since it is specified, it becomes easier to suppress variations in the position of the lead wire drawn out from the position detection mechanism over the entire movable range of the movable body.

In the present invention, the holder is formed with a contact surface that contacts the bottom surface of the bottom surface portion, and the lead wire regulating portion is recessed toward the third direction side with respect to the contact surface and has a lead wire on which a part of the lead wire is disposed. Preferably, a placement recess is formed. With this configuration, the configuration of the frame can be simplified compared to a case where a recess in which a part of the lead wire is disposed is formed in the bottom part.

In the present invention, it is preferable that the lead wire regulating section includes a lead wire holding section that holds a part of the lead wire arranged in the lead wire arrangement recess. With this configuration, when fixing the holder to the bottom part, it is possible to prevent a part of the lead wire from being caught between the bottom surface of the bottom part and the contact surface of the holder. Therefore, when fixing the holder to the bottom part, there is no need to adjust the position of the lead wire so that a part of the lead wire is not caught between the bottom surface of the bottom part and the contact surface of the holder. Therefore, it becomes possible to easily perform the work of fixing the holder to the bottom surface portion.

In the present invention, for example, the lead wire holding section includes a pair of holding protrusions arranged to sandwich a part of the lead wire, and the tip of the holding protrusion has a part of the lead wire from the lead wire holding section. A convex portion is formed to prevent it from coming off. In this case, it becomes possible to hold a portion of the lead wire with a relatively simple configuration.

In the present invention, the holder preferably includes a positioning protrusion for determining the position of the holder with respect to the bottom surface in a direction perpendicular to the first direction. With this configuration, it becomes possible to easily fix the holder to the bottom surface.

In the present invention, for example, the linear drive device includes two lead wires, the movable body includes a detected portion that is detected by a position detection mechanism, the detected portion protrudes toward the third direction, The third direction end of the detected part is arranged on the third direction side from the bottom surface of the bottom part, and a part of the detected part is placed on the bottom part when the movable body moves in the axial direction of the feed screw shaft. If a passage groove is formed to pass through, and the direction perpendicular to the axial direction of the feed screw shaft and the first direction is the fourth direction, one of the two lead wires is inserted into the passage groove in the fourth direction. The lead wire is routed on one side of the passage groove, and the other lead wire is routed on the other side of the passage groove in the fourth direction. In this case, it becomes easier to route the two lead wires compared to the case where the two lead wires are routed on one side or the other side of the passage groove in the fourth direction.

In the present invention, for example, the position detection mechanism includes a detector body and a substrate to which terminal pins of the detector body are connected, and the substrate is arranged so that the thickness direction of the substrate and the first direction match. At the same time, the board is fixed to the third direction side of the bottom part, and the board is formed with a terminal through hole through which the terminal pin is inserted, and a solder land to which the tip of the terminal pin is soldered. is inserted into the terminal through hole from the third direction side, and the solder land is formed on the edge of the terminal through hole and on the second direction side surface of the board, and the solder land on the bottom surface. A bottom through hole that penetrates the bottom in the first direction is formed in the second direction side portion.

In this case, even if the board is fixed to the bottom, the terminal pins on the detector body and the solder lands on the board can be soldered from the second direction side of the bottom using the bottom through holes. It becomes possible to do so. In this case, even if the surface on the second direction side of the board is in contact with the bottom surface of the bottom section, interference between the terminal pins of the detector body and the solder land of the board and the soldering section and the bottom section is prevented. It becomes possible to do so.

As described above, in the linear drive device of the present invention, even if the lead wire pulled out from the position detection mechanism that detects the position of the movable body on the output side is routed toward the opposite output side, the position of the lead wire can vary. becomes possible to suppress.

FIG. 1 is a side view of a linear drive device according to an embodiment of the present invention. FIG. 2 is a sectional view for explaining the configuration of the EE cross section in FIG. 1. FIG. 2 is a bottom view of the linear drive device shown in FIG. 1. FIG. 2 is a plan view of a portion of the linear drive device shown in FIG. 1. FIG. FIG. 2 is a sectional view for explaining the configuration of the FF cross section in FIG. 1. FIG. FIG. 6 is a diagram showing a state before the holder shown in FIG. 5 is attached to the bottom portion of the frame. FIG. 7 is a cross-sectional view for explaining the configuration of a holder according to another embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.

(Overall configuration of linear drive device)
FIG. 1 is a side view of a linear drive device 1 according to an embodiment of the present invention. FIG. 2 is a sectional view for explaining the configuration of the EE cross section in FIG. FIG. 3 is a bottom view of the linear drive device 1 shown in FIG. FIG. 4 is a plan view of a portion of the linear drive device 1 shown in FIG.

The linear drive device 1 of this embodiment includes a motor 2 and a movable body 3 that moves linearly with the power of the motor 2. Motor 2 is a stepping motor. The motor 2 includes a rotor 6 having a rotating shaft 4 and a driving magnet 5, and a stator 8 having a driving coil 7 and disposed on the outer peripheral side of the driving magnet 5. The output side portion of the rotating shaft 4 projects further toward the output side than the stator 8. A portion of the rotating shaft 4 that protrudes beyond the stator 8 is a feed screw shaft (lead screw) 4a having a feed screw formed on its outer circumferential surface. The movable body 3 engages with the feed screw shaft 4a and moves linearly in the axial direction of the feed screw shaft 4a when the feed screw shaft 4a rotates.

The linear drive device 1 also includes a position detection mechanism 9 for detecting the position of the movable body 3 in the axial direction of the feed screw shaft 4a, a lead wire 10 drawn out from the position detection mechanism 9, and a routing position of the lead wire 10. A holder 11 for defining the. The linear drive device 1 of this embodiment includes two lead wires 10, and the holder 11 defines the routing positions of the two lead wires 10. Note that in FIG. 1, illustration of the lead wire 10 is omitted.

In the following explanation, the X direction in FIG. 1, etc., which is the axial direction of the rotating shaft 4 (that is, the axial direction of the feed screw shaft 4a), is referred to as the front-back direction, and the X1 direction side in FIG. The "front" side is defined as the "front" side, and the other side in the front-rear direction, the X2 direction side in FIG. 1, etc., is defined as the "rear" side. In addition, for convenience of explanation, the Y direction in FIG. 1, etc., which is perpendicular to the front-rear direction, is hereinafter referred to as the left-right direction, and the Z direction, such as in FIG. 1, which is orthogonal to the front-rear direction and the left-right direction, is referred to as the up-down direction. Further, the Z1 direction side, which is one side in the vertical direction, is defined as the "upper" side, and the Z2 direction side, which is the other side in the vertical direction, is defined as the "lower" side.

The front side (X1 direction side) of this embodiment is the output side which is one side in the axial direction of the feed screw shaft 4a, and the rear side (X2 direction side) is the other side in the axial direction of the feed screw shaft 4a. There is a certain opposite output side. Further, in this embodiment, the vertical direction (Z direction) is a first direction which is a predetermined direction orthogonal to the axial direction of the feed screw shaft 4a, and the horizontal direction (Y direction) is the axial direction of the feed screw shaft 4a. The fourth direction is a direction perpendicular to the second direction and the first direction. Further, the upper side (Z1 direction side) is the second direction side, which is one side in the first direction, and the lower side (Z2 direction side) is the third direction side, which is the other side in the first direction. ing.

In addition to the rotor 6 and stator 8, the motor 2 includes a frame 14 fixed to the front side of the stator 8, and an output side bearing 16 that supports the front side portion of the rotating shaft 4 (that is, the output side portion of the feed screw shaft 4a). , a non-output side bearing 17 that supports the rear side portion of the rotary shaft 4, and a leaf spring 18 that contacts the rear end of the rotary shaft 4 and biases the rotary shaft 4 toward the front side. Further, as shown in FIG. 3, the motor 2 includes a terminal pin 19 to which the end of the drive coil 7 is electrically connected, a substrate 20 to which the terminal pin 19 is fixed, and a substrate holder that holds the substrate 20. 21 and a lead wire 22 drawn out from the substrate 20. In addition, in FIG. 2, illustration of the leaf spring 18, the board 20, the board holder 21, and the lead wire 22 is omitted.

As shown in FIG. 2, the rotor 6 includes a boss 24 fixed to the rear end portion of the rotating shaft 4. As shown in FIG. The boss 24 is, for example, formed in a thick cylindrical shape and is fixed to the outer peripheral surface of the rotating shaft 4. The driving magnet 5 is formed in a cylindrical shape. The driving magnet 5 is fixed to the outer peripheral surface of the boss 24. The driving magnet 5 is arranged on the rear side of the feed screw shaft 4a. The driving magnet 5 rotates together with the feed screw shaft 4a.

The stator 8 has a generally cylindrical shape as a whole. The front end surface and the rear end surface of the stator 8 are annular planes orthogonal to the front-rear direction. In addition to the driving coil 7 , the stator 8 includes a stator core 25 in which a plurality of pole teeth are formed facing each other on the outer peripheral surface of the driving magnet 5 , and is arranged between the stator core 25 and the driving coil 7 A bobbin 26 is provided. The drive coil 7 is wound around the bobbin 26. The drive coil 7 is arranged on the outer peripheral side of the plurality of pole teeth via the bobbin 26. The stator 8 also includes a flat end plate 29 fixed to the front surface of the stator core 25 and a flat end plate 30 fixed to the rear surface of the stator core 25.

One end of the terminal pin 19 is fixed to a terminal holding portion formed on the bobbin 26. The terminal pin 19 protrudes to one side in the left-right direction. The substrate holder 21 is fixed to one end of the stator core 25 in the left-right direction. The substrate 20 is a flat rigid substrate such as a glass epoxy substrate. The substrate 20 held by the substrate holder 21 is arranged so that the thickness direction of the substrate 20 coincides with the left-right direction. The other end of the terminal pin 19 is fixed to the board 20 by soldering. One end of the lead wire 22 is fixed to the board 20 by soldering. The lead wire 22 is routed from the substrate 20 toward the rear side.

The frame 14 includes a flat bottom portion 14a that constitutes a lower portion of the frame 14. The bottom surface portion 14a is arranged such that the thickness direction of the bottom surface portion 14a matches the vertical direction. That is, the thickness direction of the bottom surface portion 14a coincides with the up-down direction. The frame 14 also includes a flat side surface portion 14b rising upward from the front portion of the bottom surface portion 14a, and a flat side surface portion 14c rising upward from the rear portion of the bottom surface portion 14a. . The side surface portion 14b stands up at a right angle from the front end of the bottom surface portion 14a, and the side surface portion 14c stands up at a right angle from the rear end of the bottom surface portion 14a.

The frame 14 includes a bottom surface portion 14a and two side surface portions 14b and 14c, and is formed in the shape of a square groove. The side surface portion 14b holds the output side bearing 16. A side surface portion 14c is fixed to the stator 8. The side surface portion 14c is fixed to the front end surface of the stator 8 (specifically, the front surface of the end plate 29). A through hole through which the rotating shaft 4 is inserted is formed in the side surface portion 14c. A guide shaft 27 that guides the movable body 3 in the front-back direction is fixed to the frame 14. The front end of the guide shaft 27 is fixed to the side surface 14b, and the rear end of the guide shaft 27 is fixed to the side surface 14c. The side surface portion 14b of this embodiment serves as a bearing holding portion that holds the output side bearing 16. Further, the side surface portion 14c serves as a fixed portion that is fixed to the stator 8.

A passage groove 14d is formed in the bottom surface portion 14a, through which a portion of a detected portion 28b (described later) that constitutes a portion of the movable body 3 passes when the movable body 3 moves in the front-rear direction. The passage groove 14d passes through the bottom portion 14a in the vertical direction. The passage groove 14d is formed in a rectangular shape elongated in the front-rear direction.

As shown in FIG. 4, a through-hole 14f is provided in the front portion of the bottom portion 14a for use in soldering and fixing the lead wire 10 to a substrate 34, which will be described later, that constitutes the position detection mechanism 9. and through holes 14g and 14h for positioning the position detection mechanism 9 are formed. A through hole 14i for fixing the holder 11 and through holes 14j and 14k for positioning the holder 11 are formed in the rear portion of the bottom surface portion 14a. The through holes 14f to 14k penetrate the bottom portion 14a in the vertical direction. The through hole 14f in this embodiment is a bottom through hole.

The through hole 14f is formed at the front end of the bottom portion 14a. The through hole 14f is formed in a rectangular shape that is elongated in the left-right direction. The through holes 14g and 14h are formed behind the through hole 14f. The through hole 14g is a round hole. The through hole 14h is an elongated hole whose longitudinal direction is in the left-right direction. The through hole 14g and the through hole 14h are formed at the same position in the front-rear direction. Further, the through hole 14g and the through hole 14h are arranged adjacent to each other in the left and right direction.

The through holes 14i to 14k are formed at the rear end of the bottom portion 14a. The through hole 14i is formed in a rectangular shape with its long side extending in the front-rear direction. The through holes 14i are formed at two locations on both ends of the bottom surface portion 14a in the left and right direction. The through hole 14j is a round hole. The through hole 14k is an elongated hole whose longitudinal direction is in the left-right direction. The through hole 14g and the through hole 14h are formed at the same position in the front-rear direction. Further, the through hole 14g and the through hole 14h are arranged with an interval in the left-right direction. The through holes 14g and 14h are arranged between the two through holes 14i in the left-right direction.

As described above, the output side bearing 16 is held by the side surface portion 14b. The output side bearing 16 supports the front end of the rotating shaft 4 (that is, the front end of the feed screw shaft 4a). Further, the output side bearing 16 supports the rotating shaft 4 in the axial direction (front-back direction) and the radial direction of the rotating shaft 4 . The non-output side bearing 17 is held by the end plate 30. The counter-output side bearing 17 supports the rear end of the rotating shaft 4. Further, the counter-output side bearing 17 supports the rotating shaft 4 in the radial direction of the rotating shaft 4. The leaf spring 18 is fixed to the rear surface of the end plate 30.

The movable body 3 is arranged between the side surface portion 14b and the side surface portion 14c in the front-rear direction. The movable body 3 includes a nut member (not shown) in which a screw hole that engages with the feed screw shaft 4a is formed, and a slider 28 that linearly moves in the front-rear direction together with the nut member. The slider 28 includes a rotation prevention protrusion 28a for preventing rotation of the slider 28 about the feed screw shaft 4a (see FIG. 1). The anti-rotation protrusion 28a protrudes downward, for example, at an intermediate position of the slider 28 in the front-rear direction. The rotation prevention protrusion 28a is arranged above the bottom portion 14a. The slider 28 is formed with a guide hole (not shown) into which the guide shaft 27 is inserted, and a nut placement recess (not shown) into which a nut member is placed.

Further, the slider 28 includes a detected portion 28b that is detected by the position detection mechanism 9. The detected portion 28b protrudes downward at the rear end of the slider 28. The lower end of the detected portion 28b is arranged below the bottom surface 14r, which is the lower surface of the bottom surface portion 14a. A part of the detected portion 28b is arranged in the passage groove 14d. The detected portion 28b is formed into a substantially rectangular flat plate that is elongated in the vertical direction. The detected portion 28b is arranged so that the thickness direction of the detected portion 28b and the front-rear direction coincide with each other.

When assembling the linear drive device 1, the rotor 6 and stator 8 are assembled, the driving magnet 5 is arranged on the inner circumferential side of the stator 8, the frame 14 is fixed to the stator 8, and both ends of the rotating shaft 4 are fixed. is supported by the output side bearing 16 and the non-output side bearing 17. After that, the nut member is attached to the feed screw shaft 4a, and then the slider 28 is moved and placed in the nut placement recess of the slider 28, thereby assembling the slider 28 into the nut member. Thereafter, the guide shaft 27 is inserted into the guide hole of the slider 28 and fixed to the frame 14.

(Configuration of position detection mechanism and routing of lead wires)
The position detection mechanism 9 is attached to the front portion of the bottom surface 14r of the bottom surface portion 14a. The position detection mechanism 9 is arranged on the front side of the detected part 28b, and detects the position of the movable body 3 on the front side. Specifically, the position detection mechanism 9 detects the origin position of the movable body 3 in the front-rear direction on the front side. The position detection mechanism 9 is a contact switch. The position detection mechanism 9 includes a detector body 32 and a substrate 34 to which terminal pins 33 of the detector body 32 are connected. The detector main body 32 includes two terminal pins 33. The detector main body 32 and the substrate 34 are arranged below the bottom surface 14r of the bottom surface portion 14a.

The detector main body 32 includes a contact portion 35 that is movable in the front-back direction. The contact portion 35 protrudes toward the rear side and is biased toward the rear side. When the detected portion 28b of the movable body 3 contacts the contact portion 35 and the contact portion 35 moves forward to a predetermined position, it is detected that the movable body 3 is at the original position. The detector body 32 is formed with positioning protrusions 32a and 32b for positioning the detector body 32 in a direction perpendicular to the vertical direction (see FIG. 4). The positioning protrusions 32a and 32b protrude upward. The positioning protrusion 32a and the positioning protrusion 32b are arranged adjacent to each other in the left-right direction. The terminal pin 33 is arranged on the front side of the detector main body 32. The terminal pin 33 is formed in an L shape that extends from the detector main body 32 toward the front side and then toward the top.

The substrate 34 is a flat rigid substrate such as a glass epoxy substrate. The substrate 34 is arranged so that the thickness direction of the substrate 34 and the vertical direction coincide with each other. The substrate 34 is fixed to the lower side of the bottom portion 14a. The upper surface of the substrate 34 is in contact with the bottom surface 14r of the bottom surface portion 14a. Further, the board 34 is fixed to the front portion of the bottom portion 14a with two screws 36. The screw 36 is screwed into a screw hole formed in the bottom surface portion 14a from below. The two screws 36 are arranged to sandwich the detector main body 32 in the left and right direction, one screw 36 is arranged on the right side of the detector main body 32, and the other screw 36 is arranged to sandwich the detector main body 32 in the left and right direction. It is arranged on the left side of the main body 32.

The detector main body 32 is fixed to the substrate 34 by soldering terminal pins 33 to solder lands 34c, which will be described later, formed on the substrate 34. The upper surface of the detector body 32 is in contact with the lower surface of the substrate 34. The substrate 34 is formed with through holes through which the positioning projections 32a, 32b of the detector main body 32 are inserted. The positioning protrusions 32a and 32b are inserted into the through holes of the substrate 34 and the through holes 14g and 14h of the bottom surface portion 14a.

As shown in FIG. 4, the board 34 has two through holes 34a through which the terminal pins 33 are inserted, two through holes 34b through which the core wire of one end of the lead wire 10 is inserted, and two through holes 34b through which the terminal pins 33 are inserted. Two solder lands 34c to which the tips of the lead wires 10 are soldered, and two solder lands 34d to which the core wires of the lead wires 10 are soldered are formed. The through hole 34a of this embodiment is a through hole for a terminal. In addition, in FIG. 4, illustration of the terminal pin 33 and the core wire of the lead wire 10 is omitted.

Through holes 34a, 34b and solder lands 34c, 34d are formed at the front end of substrate 34. The through holes 34a, 34b and the solder lands 34c, 34d are arranged on the front side of the detector main body 32. The through holes 34a and 34b are round holes that penetrate the substrate 34 in the vertical direction. The terminal pin 33 is inserted into the through hole 34a from below, and the core wire of the lead wire 10 is inserted into the through hole 34b from below.

The through holes 34a and 34b are formed at the same position in the front-rear direction. The two through holes 34a are spaced apart from each other in the left-right direction, and the two through holes 34b are spaced apart from each other in the left-right direction. Further, the two through holes 34a are arranged inside the two through holes 34b in the left-right direction. Solder lands 34c and 34d are formed on the upper surface of the substrate 34. Solder land 34c is formed on the edge of through hole 34a, and solder land 34d is formed on the edge of through hole 34b.

When viewed from above the bottom part 14a, the front end of the board 34 is arranged in the through hole 14f of the bottom part 14a, and the through holes 34a, 34b and solder lands 34c, 34d are located in the through hole 14f. placed inside. That is, the through hole 14f is formed in the bottom portion 14a above the through holes 34a, 34b and the solder lands 34c, 34d. In this embodiment, the terminal pin 33 is soldered to the solder land 34c from above the bottom surface portion 14a using the through hole 14f. Further, the core wire of the lead wire 10 is soldered to the solder land 34d from above the bottom surface portion 14a using the through hole 14f.

The lead wire 10 drawn out from the substrate 34 is routed to the rear side along the bottom surface 14r of the bottom surface portion 14a (see FIG. 3). One of the two lead wires 10 is routed on the right side of the passage groove 14d, and the other lead wire 10 is routed on the left side of the passage groove 14d. The lead wire 10 is connected to a connector 37 on the back side of the stator 8 together with a lead wire 22 drawn out from the board 20.

(Holder configuration)
FIG. 5 is a sectional view for explaining the configuration of the FF cross section in FIG. FIG. 6 is a diagram showing a state before the holder 11 shown in FIG. 5 is attached to the bottom surface portion 14a of the frame 14. In addition, in FIG. 5, illustration of the feed screw shaft 4a and the stator 8 is omitted.

The holder 11 is provided to define the routing positions of the two lead wires 10 that are routed rearward along the bottom surface 14r of the bottom surface portion 14a. The holder 11 is made of resin. The holder 11 is fixed to the bottom portion 14a. Specifically, the holder 11 is fixed to the rear end of the bottom portion 14a. More specifically, the holder 11 is fixed at a position close to the rear end of the bottom surface portion 14a, and when the movable body 3 moves to the rear end in the movable range of the movable body 3 (the front-back movable range), It is arranged behind the movable body 3.

The holder 11 includes a main body portion 11a formed in a rectangular parallelepiped shape elongated in the left-right direction, two positioning protrusions 11b for positioning the holder 11 with respect to the bottom portion 14a in a direction perpendicular to the vertical direction, and a bottom surface. It includes two engaging protrusions 11c that engage with the portion 14a. The holder 11 of this embodiment includes a main body portion 11a, two positioning protrusions 11b, and two engaging protrusions 11c.

The main body portion 11a is arranged below the bottom surface portion 14a. Lead wire regulating portions 11d are formed at both ends of the main body portion 11a in the left and right direction, and a portion of the lead wire 10 is disposed between the bottom surface portion 14a and the lead wire regulating portion 11d in the vertical direction. There is. That is, the holder 11 includes a lead wire regulating section 11d between which a part of the lead wire 10 is arranged between the holder 11 and the bottom surface section 14a. The upper surface of the main body portion 11a excluding the lead wire regulating portion 11d is a plane perpendicular to the vertical direction, and is in contact with the bottom surface 14r of the bottom surface portion 14a. In this embodiment, the upper surface of the main body portion 11a excluding the lead wire regulating portion 11d serves as a contact surface 11e that contacts the bottom surface 14r. Note that the lower surface of the main body portion 11a is also a plane orthogonal to the vertical direction.

The lead wire regulating portion 11d is formed with a lead wire placement recess 11f that is recessed below the contact surface 11e and in which a portion of the lead wire 10 is placed. In this embodiment, a lead wire placement recess 11f is formed between a pair of holding protrusions 11g and 11h rising upward from the lower end of the lead wire regulating portion 11d. The holding protrusion 11g and the holding protrusion 11h are formed with an interval in the left-right direction, and a part of the lead wire 10 is sandwiched between the holding protrusion 11g and the holding protrusion 11h in the left-right direction.

The holding protrusion 11g is arranged inside the holding protrusion 11h in the left-right direction. A recess 11p for elastically deforming the holding protrusion 11g in the left-right direction is formed inside the holding protrusion 11g in the left-right direction. In this embodiment, the portion where the holding protrusions 11g, 11h and the recessed portion 11p are formed in the left-right direction serves as the lead wire regulating portion 11d. Further, in this embodiment, the upper end surfaces of the holding protrusions 11g and 11h are flat surfaces perpendicular to the vertical direction, and are in contact with the bottom surface 14r.

As shown in FIG. 6, a protrusion 11j that swells toward the holding protrusion 11h is formed at the tip of the holding protrusion 11g (that is, the upper end of the holding protrusion 11g). A convex portion 11k that swells toward the holding protrusion 11g is formed at the tip of the holding protrusion 11h (that is, the upper end of the holding protrusion 11h). The distance between the convex portion 11j and the convex portion 11k in the left-right direction is smaller than the outer diameter of the lead wire 10. Further, a part of the lead wire 10 is arranged below the protrusions 11j and 11k, and the protrusion 11j and the protrusion 11k allow the lead wire 10 to be connected between the holding protrusion 11g and the holding protrusion 11h. This prevents some of the parts from coming off. That is, the protrusions 11j and 11k prevent part of the lead wire 10 from coming off from the lead wire arrangement recess 11f.

In this embodiment, the pair of holding protrusions 11g and 11h constitute a lead wire holding portion 11r that holds a part of the lead wire 10 placed in the lead wire placement recess 11f. That is, the lead wire regulating section 11d includes a lead wire holding section 11r that holds a part of the lead wire 10 arranged in the lead wire arrangement recess 11f. Furthermore, protrusions 11j and 11k are formed at the tips of the holding protrusions 11g and 11h to prevent part of the lead wire 10 from coming off from the lead wire holding portion 11r. Further, in this embodiment, a part of the lead wire 10 is arranged in the lead wire arrangement recess 11f recessed below the contact surface 11e, and a part of the lead wire 10 is arranged between the bottom surface 14r and the lead wire regulating part 11d. is located between.

The positioning protrusion 11b is formed in a cylindrical shape rising upward from the contact surface 11e. The two positioning protrusions 11b are arranged inward in the left-right direction from the lead wire regulating portions 11d formed at two locations. The two positioning protrusions 11b are arranged at the same position in the front-rear direction and spaced apart in the left-right direction. One of the two positioning protrusions 11b is inserted into the through hole 14j from below, and the other positioning protrusion 11b is inserted into the through hole 14k from below.

The engagement protrusions 11c rise upward from each of the left and right ends of the main body portion 11a. The engagement protrusion 11c is formed into a flat plate shape with the thickness direction extending in the left-right direction as a whole, and is elastically deformable in the left-right direction. The engagement protrusion 11c is arranged in the through hole 14i. The upper end portion of the engagement protrusion 11c is a claw portion 11s that forms a contact surface that contacts the upper surface of the bottom portion 14a inside the through hole 14i in the left-right direction.

In this embodiment, the holder 11 is fixed to the bottom portion 14a by a snap fit utilizing the elasticity of the engagement protrusion 11c. When fixing the holder 11 to the bottom surface portion 14a, the claw portion 11s of the engagement protrusion 11c passes through the through hole 14i from the bottom to the top. When the claw portion 11s passes through the through-hole 14i, the engagement protrusion 11c is elastically deformed outward in the left-right direction, and when the claw portion 11s finishes passing through the through-hole 14i, the engagement protrusion 11c deforms outward in the left-right direction. elastically deforms inward and returns to its original state. When fixing the holder 11 to the bottom surface portion 14a, a portion of the lead wire 10 is held by the lead wire holding portion 11r.

(Main effects of this form)
As explained above, the linear drive device 1 of the present embodiment includes the holder 11 for defining the routing position of the lead wire 10, and the holder 11 has the bottom part 14a of the frame 14 and the lead wire regulating part 11d. A part of the lead wire 10 is fixed to the bottom surface part 14a with a part thereof disposed between them. Therefore, in this embodiment, even if the lead wire 10 drawn out from the position detection mechanism 9 that detects the origin position of the movable body 3 on the front side is routed to the rear side, variations in the drawing position of the lead wire 10 can be suppressed. becomes possible.

In this embodiment, the holder 11 is arranged on the rear side of the movable body 3 when the movable body 3 moves to the rear end in its movable range. That is, in this embodiment, a part of the lead wire 10 is disposed between the lead wire regulating portion 11d and the bottom surface portion 14a on the rear side of the movable body 3 when it moves to the rear end, and the lead wire 10 is The location is defined. Therefore, in this embodiment, variations in the routing position of the lead wire 10 drawn out from the position detection mechanism 9 can be easily suppressed throughout the movable range of the movable body 3. In addition, in this embodiment, since the holder 11 is fixed at a position close to the rear end of the bottom surface portion 14a, the lead wire 10 drawn out from the position detection mechanism 9 can be routed in the entire area of the bottom surface portion 14a in the front-rear direction. This makes it easier to suppress variations.

In this embodiment, the lead wire regulating portion 11d is formed with a lead wire placement recess 11f that is recessed below the contact surface 11e that contacts the bottom surface 14r of the bottom surface portion 14a. Some of them are located. Therefore, in this embodiment, the configuration of the frame 14 can be simplified compared to the case where the recessed portion in which a part of the lead wire 10 is disposed is formed on the bottom surface 14r side of the bottom surface portion 14a.

In this embodiment, the lead wire regulating part 11d includes a lead wire holding part 11r that holds a part of the lead wire 10 arranged in the lead wire arrangement recess 11f, and when fixing the holder 11 to the bottom part 14a. In this case, the lead wire holding portion 11r holds a part of the lead wire 10. Therefore, in this embodiment, when fixing the holder 11 to the bottom part 14a, it is possible to prevent a part of the lead wire 10 from being caught between the bottom surface 14r of the bottom part 14a and the contact surface 11e of the holder 11. It becomes possible. Therefore, in this embodiment, when fixing the holder 11 to the bottom surface part 14a, the position of the lead wire 10 must be adjusted so that a part of the lead wire 10 is not caught between the bottom surface 11r and the contact surface 11e. It also gets better. As a result, in this embodiment, it becomes possible to easily perform the work of fixing the holder 11 to the bottom surface portion 14a.

In this embodiment, the lead wire holding part 11r is constituted by a pair of holding protrusions 11g and 11h arranged with a part of the lead wire 10 sandwiched between them. Convex portions 11j and 11k are formed to prevent part of the lead wire 10 from coming off from the lead wire 11r. Therefore, in this embodiment, it is possible to hold a part of the lead wire 10 with a relatively simple configuration.

In this embodiment, the holder 11 includes a positioning protrusion 11b for determining the position of the holder 11 with respect to the bottom surface portion 14a in a direction orthogonal to the vertical direction. Therefore, in this embodiment, it becomes possible to easily perform the work of fixing the holder 11 to the bottom surface portion 14a. Further, in this embodiment, one of the two lead wires 10 is routed on the right side of the passage groove 14d, and the other lead wire 10 is routed on the left side of the passage groove 14d. Therefore, it becomes easier to route the two lead wires 10 compared to the case where the two lead wires 10 are routed on the right or left side of the passage groove 14d.

In this embodiment, the solder lands 34c and 34d are arranged in the through hole 14f when viewed from above the bottom surface portion 14a. In addition, in this embodiment, the terminal pin 33 is soldered to the solder land 34c from above the bottom part 14a by using the through hole 14f, and the core wire of the lead wire 10 is soldered to the solder land 34d from the top of the bottom part 14a. It is soldered. Therefore, in this embodiment, even when the board 34 is fixed to the bottom part 14a, the through holes 14f are used to easily solder the terminal pins 33 and the core wires of the lead wires 10 from above the bottom part 14a. becomes possible.

In addition, in this embodiment, since the solder lands 34c and 34d are arranged in the through hole 14f when viewed from above the bottom surface portion 14a, the top surface of the board 34 is in contact with the bottom surface 14r of the bottom surface portion 14a. Even if the terminal pin 33 and the solder land 34c are soldered together, it is possible to prevent interference between the soldered part of the terminal pin 33 and the solder land 34c and the bottom surface part 14a, and also between the core wire of the lead wire 10 and the soldered part of the solder land 34d. .

(Other embodiments)
Although the embodiment described above is an example of a preferred embodiment of the present invention, it is not limited thereto, and various modifications can be made without changing the gist of the present invention.

In the embodiment described above, the lead wire holding portion 11r may include a pressing piece that presses down a part of the lead wire 10 from above instead of the holding protrusions 11g and 11h. In this case, the pressing piece is, for example, formed in a flat plate shape with the thickness direction in the up-down direction, and is elastically deformable in the up-down direction. Further, in this case, for example, the pressing piece extends toward the inside in the left-right direction, and a portion of the lead wire 10 is pushed into the lower side of the elastic piece from the inside in the left-right direction.

In the above embodiment, as shown in FIG. 7(A), the lead wire regulating section 11d does not need to include the lead wire holding section 11r. In the modification shown in FIG. 7A, a lead wire arrangement recess 11f recessed below the contact surface 11e is formed in the lead wire regulating portion 11d, and the width of the lead wire arrangement recess 11f in the left-right direction is as follows. It is wider than the distance in the left-right direction between the holding protrusion 11g and the holding protrusion 11h. Further, in this modification, the portion where the lead wire arrangement recess 11f is formed in the left-right direction serves as the lead wire regulating portion 11d. In addition, in FIG. 7(A), the same reference numerals are attached to the same configurations as those in the above-described embodiment.

In the above-described embodiment, as shown in FIG. 7(B), the lead wire arrangement recess 11f may not be formed in the lead wire regulating portion 11d. That is, the upper surface of the lead wire regulating portion 11d may be a part of the contact surface 11e that contacts the bottom surface 14r. In this case, a recess 14t in which a part of the lead wire 10 is disposed is formed on the bottom surface 14r side of the bottom surface portion 14a. The recess 14t is recessed above the bottom surface 14r. In this modification, a portion disposed below the recess 14t in the left-right direction serves as a lead wire regulating portion 11d. Note that in FIG. 7(B), the same components as those in the above-described embodiment are denoted by the same reference numerals.

In the embodiment described above, the linear drive device 1 includes one holder 11 for defining the routing position of the two lead wires 10, but the linear drive device 1 includes one holder 11 instead of the holder 11, or In addition to the holder 11, a holder for defining the routing position of the lead wire 10 passing on the right side of the passage groove 14d, and a holder for regulating the routing position of the lead wire 10 passing on the left side of the passage groove 14d. Two holders may be provided.

When the linear drive device 1 includes two holders instead of the holder 11, the two holders may be arranged at the rear end of the bottom part 14a, as in the above-mentioned embodiment, or One holder may be placed on each of the right and left sides of the passage groove 14d. However, if one holder is placed on each of the right and left sides of the passage groove 14d, there is a risk that the lead wire 10 will be routed in a different position between the rear end of the bottom part 14a and the holder in the front-rear direction. Therefore, it is preferable that the two holders be arranged at the rear end of the bottom part 14a.

In the embodiment described above, the lead wire 10 immediately after being pulled out from the substrate 34 may be routed along the outer portion of the head of the screw 36 in the left-right direction. Further, in the above-described embodiment, the two lead wires 10 may be routed together on the right side or the left side of the passage groove. Furthermore, in the embodiment described above, a part of the rotating shaft 4 is the feed screw shaft 4a, but the feed screw shaft 4a formed separately from the rotating shaft 4 may be fixed to the rotating shaft 4. Moreover, in the embodiment described above, the motor 2 may be a motor other than a stepping motor.

1 Linear drive device 2 Motor 3 Movable body 4a Feed screw shaft 5 Drive magnet 6 Rotor 7 Drive coil 8 Stator 9 Position detection mechanism 10 Lead wire 11 Holder 11b Positioning protrusion 11d Lead wire regulation portion 11e Contact surface 11f Lead wire arrangement Recessed parts 11g, 11h Holding protrusions 11j, 11k Convex parts 11r Lead wire holding part 14 Frame 14a Bottom part 14b Side part (bearing holding part)
14c Side part (fixed part)
14d Passing groove 14f Through hole (bottom through hole)
14r Bottom surface 16 Output side bearing 28b Detected part 32 Detector body 33 Terminal pin 34 Board 34a Through hole (through hole for terminal)
34c Solder land X Axial direction of feed screw shaft X1 Output side

Claims (8)

a motor having a feed screw shaft; a movable body that engages with the feed screw shaft and moves linearly in the axial direction of the feed screw shaft when the feed screw shaft rotates; A position detection mechanism for detecting the position of a movable body, a lead wire drawn out from the position detection mechanism, and a holder for defining a routing position of the lead wire,
A predetermined direction perpendicular to the feed screw shaft is a first direction, one axial side of the feed screw shaft is an output side, the other axial side of the feed screw shaft is a counter-output side, and the first direction If one side of is the second direction side and the other side of the first direction is the third direction side,
The motor includes a rotor having a drive magnet that rotates together with the feed screw shaft, a stator having a drive coil and disposed on the outer peripheral side of the drive magnet, and an output side portion of the feed screw shaft. comprising a supporting output side bearing, and a frame fixed to the output side of the stator and holding the output side bearing,
The frame includes a flat bottom portion that constitutes a third direction side portion of the frame, and a bearing holding portion that rises from the output side portion of the bottom portion toward the second direction side and holds the output side bearing. , a fixed portion rising from the opposite-to-output side portion of the bottom portion toward the second direction side and fixed to the stator;
The thickness direction of the bottom portion coincides with the first direction,
The movable body is arranged between the bearing holding part and the fixed part in the axial direction of the feed screw shaft,
The position detection mechanism is attached to an output side portion of the bottom surface that is a third direction side surface of the bottom portion, and detects the position of the movable body on the output side;
The lead wire is routed along the bottom surface of the bottom portion toward the opposite output side,
The linear drive device is characterized in that the holder includes a lead wire regulating section in which a part of the lead wire is disposed between the holder and the bottom section, and is fixed to the bottom section. 2. The linear drive device according to claim 1, wherein the holder is disposed on the opposite output side of the movable body when the movable body moves to the opposite end of the movable range of the movable body. The holder is formed with a contact surface that contacts the bottom surface of the bottom portion,
3. The lead wire regulating portion is formed with a lead wire arrangement recess that is recessed toward the third direction side than the contact surface and in which a part of the lead wire is arranged. linear drive. 4. The linear drive device according to claim 3, wherein the lead wire regulating section includes a lead wire holding section that holds a part of the lead wire arranged in the lead wire arrangement recess. The lead wire holding section includes a pair of holding protrusions that are arranged to sandwich a part of the lead wire,
5. The linear drive device according to claim 4, wherein a convex portion is formed at a tip of the holding protrusion to prevent part of the lead wire from coming off from the lead wire holding portion. 6. The linear drive device according to claim 1, wherein the holder includes a positioning protrusion for determining the position of the holder with respect to the bottom surface in a direction perpendicular to the first direction. comprising two lead wires,
The movable body includes a detected part that is detected by the position detection mechanism,
The detected portion protrudes toward the third direction,
The third direction end of the detected portion is arranged closer to the third direction than the bottom surface of the bottom surface portion,
A passage groove is formed in the bottom surface portion, through which a part of the detected portion passes when the movable body moves in the axial direction of the feed screw shaft,
If a direction perpendicular to the axial direction of the feed screw shaft and the first direction is a fourth direction,
One of the two lead wires is routed on one side of the passage groove in the fourth direction, and the other lead wire is routed on the other side of the passage groove in the fourth direction. The linear drive device according to any one of claims 1 to 6, characterized in that the linear drive device is rotated. The position detection mechanism includes a detector body and a board to which terminal pins of the detector body are connected,
The substrate is arranged so that the thickness direction of the substrate and the first direction match, and is fixed to the third direction side of the bottom part,
A terminal through hole into which the terminal pin is inserted, and a solder land into which the tip of the terminal pin is soldered are formed in the board,
The terminal pin is inserted into the terminal through hole from the third direction side,
The solder land is formed on the edge of the terminal through hole and on the second direction side surface of the substrate,
8. Any one of claims 1 to 7, wherein a bottom part through hole that penetrates the bottom part in the first direction is formed in a part of the bottom part on the second direction side of the solder land. The linear drive device described in .

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