CN114810989A

CN114810989A - Drive device and method for manufacturing drive device

Info

Publication number: CN114810989A
Application number: CN202210058434.1A
Authority: CN
Inventors: 百濑阳介
Original assignee: Nidec Copal Corp
Current assignee: Nidec Precision Corp
Priority date: 2021-01-20
Filing date: 2022-01-19
Publication date: 2022-07-29
Also published as: JP2022111736A

Abstract

The present invention provides a driving device and a manufacturing method of the driving device, the driving device of one embodiment of the present invention comprises: a 2-gear transmission motor having a motor main body extending along a central axis and a pinion gear disposed on one side of the motor main body in an axial direction and rotated around the central axis by the motor main body; a rack engaged with the 2 pinions; and a frame holding 2 gear drive motors and a rack. The direction in which the central axes of the 2 gear drive motors are aligned is defined as the 1 st direction, and the direction perpendicular to the 1 st direction and the central axis is defined as the 2 nd direction. The dimension in the 2 nd direction of the geared motor is largest at the motor body. The motor main body protrudes from the frame to both sides in the 2 nd direction.

Description

Drive device and method for manufacturing drive device

Technical Field

The present invention relates to a drive device and a method of manufacturing the drive device.

Background

In recent years, electronic devices such as smartphones have been increasingly thinned, and there is a demand for thinning of mounted geared motors. Patent document 1 discloses a gear box device mounted on such a thin electronic device.

Patent document 1: japanese patent laid-open publication No. 2019-47589

The present inventors have conceived a driving device that realizes a reduction in thickness and an increase in output of the driving device by driving 1 rack using a plurality of motors arranged in parallel. In such a structure, further thinning is required.

Disclosure of Invention

An object of one embodiment of the present invention is to provide a driving device that can be made thin while ensuring driving force.

A driving device according to one embodiment of the present invention includes: a 2-pinion drive motor having a motor main body extending along a central axis and a pinion gear disposed on one side of the motor main body in an axial direction and rotated around the central axis by the motor main body; a rack engaged with 2 of the pinions; and a frame holding 2 of the gear drive motors and the racks. The direction in which the central axes of 2 of the geared motors are aligned is defined as a 1 st direction, and the direction perpendicular to the 1 st direction and the central axes is defined as a 2 nd direction. The dimension of the geared motor in the 2 nd direction is largest at the motor main body. The motor main body protrudes from the frame to both sides in the 2 nd direction.

In a method of manufacturing a driving device according to an aspect of the present invention, the driving device includes 2 gear motors having a columnar shape with a center axis as a center, and a frame that supports the 2 gear motors in a parallel arrangement. In a manufacturing method of a driving device, a direction in which central axes of 2 gear motors are arranged is set as a 1 st direction, a direction perpendicular to the 1 st direction and the central axes is set as a 2 nd direction, a 1 st jig and a 2 nd jig are used which are opposed to each other with a gap in the 2 nd direction, the frame and the gear motors are arranged in the gap, the frame and the 2 gear motors are pressed toward the 2 nd jig by the 1 st jig, respectively, to position the frame and the 2 gear motors with respect to the 2 nd jig, and in this state, the frame and the 2 gear motors are engaged with each other.

According to one aspect of the present invention, a driving device capable of achieving a reduction in thickness while ensuring driving force is provided.

Drawings

Fig. 1 is a sectional view of a driving device according to an embodiment.

Fig. 2 is an exploded perspective view of a driving device according to an embodiment.

Fig. 3 is a front view of a driving apparatus according to an embodiment.

Fig. 4 is a perspective view of the driving device, the 1 st jig, and the 2 nd jig according to one embodiment.

Fig. 5 is a perspective view of the driving device, the 1 st jig, and the 2 nd jig according to one embodiment.

FIG. 6 is a front view of the drive, the 1 st clamp, and the 2 nd clamp of one embodiment.

Fig. 7 is a sectional view of the driving device, the 1 st jig, and the 2 nd jig taken along line VII-VII of fig. 6.

Description of the reference symbols

1: a drive device; 2: a geared motor; 3: a rack; 5: a pinion gear; 7: a 1 st bearing; 8: a 2 nd bearing; 10: a frame; 12: a 2 nd support part; 12 a: a notch portion; 16: 1 st support part; 20: a motor main body; 29: a motor shaft (shaft); 30: a planetary gear mechanism (transmission mechanism); 36 p: a shaft; 51: 1, a clamp; 52: a 2 nd clamp; d: size; d1: the 1 st direction; d2: a 2 nd direction; j: a central axis; s: a gap.

Detailed Description

Hereinafter, a driving device 1 according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention.

In the drawings, an XYZ coordinate system is appropriately shown as a 3-dimensional vertical coordinate system. In the following description, unless otherwise specified, the direction (Z-axis direction) parallel to each central axis J may be simply referred to as "axial direction", the + Z side may be simply referred to as "other axial side", and the-Z side may be simply referred to as "one axial side". The circumferential direction around each central axis J may be simply referred to as the "circumferential direction", and the radial direction with respect to each central axis J may be simply referred to as the "radial direction".

For the sake of simplifying the description of the present specification, the Y-axis direction may be simply referred to as the up-down direction, the + Y-axis direction may be simply referred to as the upper side, and the-Y direction may be simply referred to as the lower side. The vertical direction in this specification is a direction set for convenience of explanation, and does not limit the posture of the drive device 1 during use or assembly.

(drive device)

Fig. 1 is a sectional view of a drive device 1. Fig. 2 is an exploded perspective view of the drive device 1. The drive device 1 of the present embodiment is mounted on a thin electronic device in which the dimension along the Y axis direction is suppressed.

As shown in fig. 1, the drive device 1 has 2 geared motors 2, a rack 3, a frame 10, and an attachment 40.

(Gear drive motor)

The geared motor 2 has a cylindrical shape extending in the Z-axis direction. The 2 gear motors 2 are disposed adjacent to each other in the X-axis direction. In the following description, when the gear motor 2 is divided into 2, one is referred to as a 1 st gear motor 2A, and the other is referred to as a 2 nd gear motor 2B.

The 1 st geared motor 2A extends along the 1 st central axis J1. In addition, the 2 nd geared motor 2B extends along the 2 nd central axis J2. The 1 st central axis J1 and the 2 nd central axis J2 extend in parallel with each other. In the following description, the 1 st central axis J1 and the 2 nd central axis J2 are collectively referred to as the central axis J without distinguishing them.

The geared motor 2 includes a motor main body 20, a planetary gear mechanism (transmission mechanism) 30 connected to the motor main body 20, a pinion gear 5 connected to the planetary gear mechanism 30, a 1 st bearing 7, and a 2 nd bearing 8.

In the following description, when the 1 st gear motor 2A and the 2 nd gear motor 2B are distinguished from each other, the motor main body 20, the planetary gear mechanism 30, and the pinion gear 5 are also distinguished from each other. In this case, the motor main body 20, the planetary gear mechanism 30, and the pinion gear 5 of the 1 st geared motor 2A are referred to as a 1 st motor main body 20A, a 1 st planetary gear mechanism 30A, and a 1 st pinion gear 5A, respectively. The motor main body 20, the planetary gear mechanism 30, and the pinion gear 5 of the 2 nd geared motor 2B are referred to as a 2 nd motor main body 20B, a 2 nd planetary gear mechanism 30B, and a 2 nd pinion gear 5B, respectively.

In this specification, a direction in which the center axes of the 2 gear drive motors 2 are aligned is referred to as a 1 st direction D1. In addition, a direction perpendicular to the 1 st direction D1 and the central axis J is referred to as a 2 nd direction D2. In the present embodiment, the 1 st direction D1 is a direction parallel to the X axis, and the 2 nd direction D2 is a direction parallel to the Y axis (vertical direction). In the following description, the lower side may be referred to as one side in the 2 nd direction D2, and the upper side may be referred to as the other side in the 2 nd direction D2.

The motor shaft (shaft) 29 of the 1 st motor main body 20A, the 1 st planetary gear mechanism 30A, and the 1 st pinion gear 5A rotate about the 1 st central axis J1. On the other hand, the motor shaft 29 of the 2 nd motor main body 20B, the 2 nd planetary gear mechanism 30B, and the 2 nd pinion gear 5B rotate about the 2 nd central axis J2.

The motor main body 20 extends along the central axis J. The motor main body 20 is generally cylindrical about each central axis J. The 2 motor main bodies 20 are stepping motors having stepping angles equal to each other. The step angle is a rotation angle of the motor main body 20 that operates in 1 pulse in the stepping motor.

The motor main body 20 includes a rotor 21 that rotates about each center axis J, a stator 22 that surrounds the rotor 21 from the radial outside, and a motor case 23 that surrounds the stator 22 from the radial outside. The rotor 21 has a motor shaft 29 extending along each central axis J.

The 2 nd bearing 8 is disposed along the end surface of the other side (+ Z side) in the axial direction of the motor main body 20. The 2 nd bearing 8 is an annular metal bearing centered on the central axis J. The 2 nd bearing 8 rotatably supports the motor shaft 29 of the motor main body 20.

The planetary gear mechanism 30 is disposed on one axial side (-Z side) of the motor main body 20. The planetary gear mechanism 30 is connected to the motor shaft 29 of the motor main body 20. The planetary gear mechanism 30 is a speed reduction mechanism that reduces the speed of the power of the motor main body 20 and transmits the power to the pinion gear 5. In the present embodiment, the reduction gear ratio of the 1 st planetary gear mechanism 30A and the reduction gear ratio of the 2 nd planetary gear mechanism 30B are equal to each other.

The planetary gear mechanism 30 has a gear housing 39, a 1

st sun gear

33a, 31 st planet gears 33b, a 1 st carrier 31, 32 nd planet gears 34b, a 2 nd carrier 32, 3 rd planet gears 35b, and a 3 rd carrier 36, respectively.

The gear housing 39 is fixed to the frame 10. That is, the planetary gear mechanism 30 is supported by the frame 10 in the gear housing 39. The gear housing 39 has an internal gear 39a and a bearing holding portion 39 d.

The internal gear 39a is cylindrical and extends in the axial direction around each central axis J. The internally-toothed gear 39a meshes with the 1 st planetary gear 33b, the 2 nd planetary gear 34b, and the 3 rd planetary gear 35 b. The bearing holding portion 39d is located at an end portion on one axial side (-Z side) of the internal gear 39 a. The bearing holding portion 39d extends cylindrically about the center axis J. A sliding bearing is attached to the inner peripheral surface of the bearing holding portion 39 d. The bearing holding portion 39d holds the 1 st bearing 7. The bearing holding portion 39d rotatably supports a cylindrical portion 36f described later via the 1 st bearing 7.

The 1 st bearing 7 is disposed between the planetary gear mechanism 30 and the pinion gear 5 in the axial direction. That is, the 1 st bearing 7 is disposed between the motor main body 20 and the pinion gear 5 in the axial direction. The 1 st bearing 7 rotatably supports the pinion gear 5 via the output portion 36 c.

The 1 st sun gear 33a is fixed to the motor shaft 29 and rotates together with the motor shaft 29 about each central axis J. The 31 st planetary gears 33b are arranged at equal intervals in the circumferential direction of each central axis J. The 31 st planetary gears 33b are meshed with the 1 st sun gear 33 a. The 31 st planetary gears 33b revolve around the respective center axes J in accordance with the rotation of the 1 st sun gear 33 a.

The 1 st carrier 31 has a 1

st disc portion

31b, 31 st counter shafts 31a, and a 2 nd sun gear 31 c. The 1 st disc portion 31b extends in the radial direction around each central axis J. The 31 st auxiliary shafts 31a extend from the 1 st disc portion 31b to the other axial side (+ Z side). The 2 nd sun gear 31c extends from the 1 st disc portion 31b to one axial side (-Z side) about each central axis J.

The 31 st counter shafts 31a rotatably support the 1 st planetary gear 33b, respectively. The 1 st carrier 31 rotates about each central axis J in accordance with the revolving rotation of the 31 st planetary gears 33 b.

The 2 nd sun gear 31c is a part of the 1 st carrier 31, and therefore rotates about each central axis J in accordance with the revolving rotation of the 1 st planetary gear 33 b.

The 32 nd planetary gears 34b are disposed at equal intervals in the circumferential direction of each central axis J.

The 3 nd 2 nd planetary gears 34b are meshed with the 2 nd sun gear 31 c. The 32 nd planetary gears 34b revolve in the circumferential direction of each central axis J in accordance with the rotation of the 2 nd sun gear 31 c.

The 2 nd carrier 32 has a 2

nd disc portion

32b, 3 nd counter shafts 32a, and a 3 rd sun gear 32 c. The 2 nd disc portion 32b extends in the radial direction around each of the center axes J. The 32 nd sub shafts 32a extend from the 2 nd disc portion 32b to the other axial side (+ Z side). The 3 rd sun gear 32c extends from the 2 nd disc portion 32b toward one axial direction side (-Z side) around each of the center axes J.

The 32 nd counter shafts 32a rotatably support the 2 nd planetary gear 34b, respectively. The 2 nd carrier 32 rotates about each central axis J in accordance with the revolution of the 32 nd planetary gears 34 b.

The 3 rd sun gear 32c is a part of the 2 nd carrier 32, and therefore rotates about each central axis J in accordance with the revolution rotation of the 2 nd planetary gear 34 b.

The 3 rd 3 planetary gears 35b are arranged at equal intervals in the circumferential direction of each central axis J. The 3 rd 3 planetary gears 35b are meshed with the 3 rd sun gear 32 c. The 3 rd 3 planetary gears 35b revolve in the circumferential direction of each central axis J in accordance with the rotation of the 3 rd sun gear 32 c.

The 3 rd carrier 36 includes a 3

rd disc portion

36b, 3 rd sub shafts 36a, and an output portion 36 c. The 3 rd disc portion 36b extends in the radial direction around each of the center axes J. The 3 rd sub shafts 36a extend from the 3 rd disc portion 36b to the other axial side (+ Z side). The output portion 36c extends from the 3 rd disc portion 36b to one axial direction side (-Z side) with each center axis J as a center.

The 3 rd 3 counter shafts 36a rotatably support the 3 rd planetary gear 35b, respectively. The 3 rd counter shaft 36a rotates about each central axis J in accordance with the revolution rotation of the 3 rd planetary gears 35 b.

The output portion 36c includes a columnar portion 36f extending around each central axis J, and a fitting shaft portion 37 extending in the axial direction from a distal end surface of the columnar portion 36 f. The cylindrical portion 36f is rotatably supported by the 1 st bearing 7. In addition, a holding hole 36d is provided in an end surface of the output portion 36c facing one axial side (-Z side). The shaft 36p is inserted into the holding hole 36 d.

The pinion gear 5 is disposed on one axial side (on the side of Z) of the motor main body 20 and the planetary gear mechanism 30. The 2 pinions 5 are aligned in the 1 st direction D1. The pinion gears 5 are arranged centering on the respective center axes J. The pinion gears 5 are rotated about the respective center axes J by the motor main body 20. The pinion gear 5 is provided with a through hole 5h penetrating in the axial direction. The shaft 36p is inserted into the through hole 5 h.

A fitting recess 38 is provided on the surface of the pinion gear 5 facing the other axial side (+ Z side). The fitting shaft portion 37 of the output portion 36c is fitted in the fitting recess portion 38. Thereby, the pinion gear 5 is rotated around the central axis J by the motor main body 20 via the planetary gear mechanism 30.

The shaft 36p extends centering on each center axis J. The other axial end (+ Z side) of the shaft 36p is supported by the output portion 36c, and the one axial end (-Z side) is supported by the attachment 40 via the 3 rd bearing 6. The shaft 36p assists the rotation of the pinion 5 about each central axis J.

(Rack)

As shown in fig. 2, the rack 3 is plate-shaped with the plate thickness direction being the vertical direction. The rack 3 is molded by MIM (Metal Injection Molding).

The 2 pinions 5 are disposed adjacent to each other in a direction perpendicular to each central axis J (in the X-axis direction in the present embodiment). The rack 3 extends linearly along the direction in which the 2 pinions 5 are aligned. The rack 3 is located on the lower side with respect to a pair of

shafts

36p and 2 pinions 5.

The rack 3 has: a gear main body portion 3b having a plurality of tooth surfaces arranged in the X-axis direction; and a pair of rail portions 3a protruding from both sides of the gear main body portion 3b in the Z-axis direction. The rail portion 3a extends along the extending direction (X-axis direction) of the rack 3.

The rack 3 is engaged with 2 pinions 5 in the gear body 3 b. The rack 3 is operated in one direction by transmitting power output from the 2 pinions 5. The rack 3 is moved in the 1 st direction D1.

The rail portion 3a is supported by the rack guide portion 14 of the frame 10 from below. The rack 3 receives a downward force from the pinion 5 by power transmission from the pinion 5 to the rack 3. According to the present embodiment, the rail portion 3a slides in the 1 st direction D1 on the rack guide portion 14 of the frame 10.

According to the driving device 1 of the present embodiment, the 2-gear transmission motors 2 are arranged in a columnar shape along the 1 st direction D1. Therefore, the dimension of the driving device 1 in the height direction (the 2 nd direction D2) can be suppressed, and the driving device 1 can be easily mounted on an electronic apparatus that is thin in the Y-axis direction. That is, according to the present embodiment, by using 2 motor bodies 20, the output of the drive device 1 can be sufficiently ensured, and the dimension in the Y axis direction can be suppressed.

(frame)

The frame 10 holds 2 the geared motor 2 and the rack 3. An attachment 40 is fixed to the frame 10. The frame 10 supports the rack 3 slidably.

The frame 10 includes 2 outer shell portions 11, a support frame portion 13, and a plurality of fixing portions 15. The frame 10 is formed by MIM.

The support frame 13 is in a frame shape surrounding the 1 st pinion gear 5A and the 2 nd pinion gear 5B from four sides. A rectangular enclosure space surrounded by the support frame 13 is open in the vertical direction. The support frame 13 has an upper opening and a lower opening, the upper and lower directions of which are opening directions. The lower opening is covered with the rack 3. In addition, the attachment 40 is inserted into the upper opening.

The attachment 40 is inserted into the support frame 13 and fixed to the support frame 13. Thus, the attachment 40 reinforces the frame 10 around the 1 st pinion gear 5A and the 2 nd pinion gear 5B. The attachment 40 holds the 3 rd bearing 6. That is, the attachment 40 rotatably supports the shaft 36p via the 3 rd bearing 6. The attachment 40 of the present embodiment is formed by MIM.

The support frame portion 13 includes: a 1 st surrounding wall 13a located on the other axial side (+ Z side) of the 1 st pinion gear 5A and the 2 nd pinion gear 5B; the 2 nd surrounding wall 13b located on the one axial side (-Z side); a 3 rd surrounding wall 13c located on the driving direction side (-X side) of the rack 3; and a 4 th surrounding wall 13d located on the other side (+ X side) of the driving direction of the rack 3. That is, the frame 10 has the 1 st to 4 th surrounding walls 13a to 13d arranged in a rectangular shape when viewed from the top-bottom direction.

The 1 st surrounding wall 13a and the 2 nd surrounding wall 13b extend along the driving direction of the rack 3, i.e., the 1 st direction D1. The 1 st surrounding wall 13a and the 2 nd surrounding wall 13b are opposed to each other in the width direction of the rack 3. In the 1

st surrounding wall

13a, 21 st supporting portions 16 are provided. The 1 st support portion 16 is formed in a notch shape that is open upward and accommodates the bearing holding portion 39 d. The 1 st support portion 16 supports the 1 st bearing 7 via the bearing holding portion 39 d. That is, the frame 10 has the 1 st support portion 16 that supports the 1 st bearing 7. The 1 st support portion 16 contacts the 1 st bearing 7 from the lower side (the side in the 2 nd direction D2).

The 1 st surrounding wall 13a and the 2 nd surrounding wall 13b have rack guide portions 14 protruding from lower end portions thereof respectively inward in the width direction of the rack 3. The rack guide 14 extends in the driving direction of the rack 3. The rack guide 14 slidably supports the rail portion 3a of the rack 3 from below. Thereby, the support frame 13 guides the movement of the rack 3 in the X-axis direction.

The 2 casing portions 11 are disposed on the other side (+ Z side) in the axial direction with respect to the support frame portion 13. The 2 housing portions 11 support the 1 st gear motor 2A and the 2 nd gear motor 2B, respectively. The housing portion 11 is open to the upper side. The housing 11 accommodates and fixes the geared motor 2 in the opening. In the present embodiment, 2 casing parts 11 are arranged in the 1 st direction D1.

The shell portion 11 has a 1 st beam portion 11a, a 2 nd beam portion 11b, a central beam portion 11c, and a 2 nd support portion 12. The 1 st beam portion 11a, the 2 nd beam portion 11b, and the central beam portion 11c extend from the support frame portion 13 to the other axial side (+ Z side). The 2 nd support portion 12 connects the 1 st beam portion 11a, the 2 nd beam portion 11b, and the other axial end (+ Z side) of the central beam portion 11c to each other.

The 1 st beam portion 11a, the central beam portion 11c, and the 2 nd beam portion 11b are arranged in order along the 1 st direction D1. The 1 st beam portion 11a is arranged along the + X side surface of the 1 st geared motor 2A. The 2 nd beam part 11B is arranged along the-X side surface of the 2 nd geared motor 2B. The center beam portion 11c is disposed between the 1 st gear motor 2A and the 2 nd gear motor 2B. A gap is provided between the 1 st beam portion 11a and the central beam portion 11 c. Similarly, a gap is provided between the 2 nd beam portion 11b and the central beam portion 11 c.

The lower end of the 1 st beam 11a and the side surface on the-X side are curved along the outer peripheral surface of the geared motor 2. Similarly, the lower end of the 2 nd beam 11b and the + X side surface are curved along the outer peripheral surface of the geared motor 2. The + X side and the-X side of the central beam 11c are curved along the outer peripheral surfaces of the geared motor 2.

Fig. 3 is a front view of the drive device 1 as viewed from the other axial side (+ Z side).

The outer peripheral surface of the 1 st geared motor 2A protrudes downward through the gap S between the 1 st beam portion 11a and the central beam portion 11 c. The outer peripheral surface of the 2 nd geared motor 2B is exposed downward from the gap S between the 2 nd beam portion 11B and the central beam portion 11c and protrudes downward. The outer peripheral surface of the 2-gear transmission motor 2 protrudes upward from the frame 10.

In the present embodiment, the dimension D in the 2 nd direction D2 of the geared motor 2 is largest at the motor main body 20. That is, the outer peripheral surface of the motor main body 20 is located at the end closest to the 2 nd direction D2, and the outer peripheral surface of the motor main body 20 is located at the end closest to the other side in the 2 nd direction D2. Further, the motor main body 20 protrudes from the frame 10 to both sides in the 2 nd direction D2.

According to the present embodiment, the drive device 1 can be thinned in the 2 nd direction D2, and the outer diameter of the motor main body 20 can be maximized within the allowable range of the 2 nd direction D2. That is, according to the present embodiment, the size of the drive device 1 in the 2 nd direction D2 can be reduced while ensuring the output of the motor main body 20.

The 2 nd support portion 12 is plate-shaped extending along a plane perpendicular to the central axis J. The 2 nd support portion 12 is provided with a cutout portion 12a that opens upward (the other side in the 2 nd direction D2). The notch 12a accommodates the 2 nd bearing 8 of the geared motor 2. In the frame 10 of the present embodiment, 2 notch portions 12a are provided in the 2 nd supporting portion 12 in order to support the 2 nd gear drive motor 2.

The notch 12a of the 2 nd support portion 12 has a pair of side surfaces 12b facing each other in the 1 st direction D1. A welded portion 12c is provided between the 2 nd bearing 8 and an inner side surface (in the present embodiment, the side surface 12b) of the cutout portion 12a facing the 1 st direction D1. That is, the 2 nd bearing 8 and the side surface 12b are joined to each other by welding and fixed to each other. Thereby, the 2 nd support portion 12 supports the 2 nd bearing 8. That is, the frame 10 has the 2 nd support portion 12 that supports the 2 nd bearing 8.

In the present embodiment, the 2 nd bearing 8 is in contact only with the side surface 12b of the cutout portion 12a, and the 2 nd bearing 8 is disposed apart from the inner side surface of the cutout portion 12a in the 2 nd direction D2. That is, the 2 nd support portion 12 is engaged with the 2 nd bearing 8 in a state of being separated from the 2 nd bearing 8 in the 2 nd direction D2.

The 2 nd support portion 12 supports the motor shaft 29 at the end of the motor main body 20 where the dimension D in the 2 nd direction D2 of the geared motor 2 is largest. Therefore, if the support position of the 2 nd support portion 12 is shifted, the motor main body 20 easily protrudes out of the predetermined range in the 2 nd direction D2. According to the present embodiment, since the 2 nd bearing 8 is separated from the 2 nd supporting part 12 in the 2 nd direction D2, the 2 nd bearing 8 can be joined to the 2 nd supporting part 12 while adjusting the position thereof with respect to the 2 nd direction D2. That is, according to the present embodiment, the 2 nd bearing 8 can be fixed to the 2 nd support portion 12 while adjusting the posture of the 2 nd geared motor 2 with respect to the frame 10. Thereby, the relative posture of the 2 geared motors 2 to each other and the posture to the frame 10 can be finely adjusted. As a result, it is possible to minimize the variation in the dimension of the driving device 1 along the 2 nd direction D2 due to the dimensional error, the assembly error, and the like of the frame 10.

As described above, the dimension D of the 2 nd direction D2 of the geared motor 2 is largest at the motor main body 20. Therefore, the portion of the geared motor 2 other than the motor main body 20 is smaller in size in the 2 nd direction D2 than the motor main body 20. As described above, the geared motor 2 is supported by the 1 st support portion 16 of the frame 10 from below in the 1 st bearing 7. That is, the frame 10 supports a portion having a smaller size than the motor main body 20 in the 2 nd direction D2 from the 2 nd direction D2. As a result, even if there is a dimensional error in the frame 10, the geared motor 2 is less likely to protrude from the predetermined range in the 2 nd direction.

In particular, according to the present embodiment, the 1 st bearing 7 is disposed between the planetary gear mechanism 30 and the pinion gear 5, and therefore is separated from the motor main body 20 by the dimension in the axial direction of the planetary gear mechanism 30. Therefore, even if the 1 st supporting part 16 supporting the 1 st bearing 7 has low dimensional accuracy, the motor main body 20 having the largest dimension in the 2 nd direction D2 is less likely to protrude from the predetermined range in the 2 nd direction D2.

As shown in fig. 1, the fixing portion 15 is plate-shaped along a plane (XZ plane) perpendicular to the vertical direction. In the present embodiment, 4 fixing portions 15 are provided in the frame 10. 2 of the 4 fixing portions 15 protrude outward from the side surface of the 1 st beam portion 11a, and the other 2 protrude outward from the side surface of the 2 nd beam portion 11 b.

The fixing portion 15 is provided with a fixing hole 15a penetrating in the plate thickness direction. Screws for fixing the drive device 1 to an external member (for example, a case for housing electronic equipment of the drive device 1) are inserted into the fixing holes 15 a. The frame 10 is fixed to the exterior member at the fixing portion 15.

(production method)

Next, an assembling method (manufacturing method) of the driving device 1 according to the present embodiment will be described with reference to fig. 4 to 7. The assembly process of the driving device 1 of the present embodiment is performed using the 1 st jig 51 and the 2 nd jig 52 facing each other with a gap in the 2 nd direction D2.

The 1 st jig 51 and the 2 nd jig 52 are each in a block shape. The 1 st jig 51 and the 2 nd jig 52 are stacked on each other in the vertical direction. The drive device 1 (i.e., the frame 10, the 2-gear motor 2, and the rack 3) during assembly is disposed in a gap between the 1 st jig 51 and the 2 nd jig 52. The 2-gear motor 2 and the frame 10 are fixed to each other in a state where the driving device 1 is sandwiched between the 1 st jig 51 and the 2 nd jig 52.

The vertical direction of the driving device 1 is reversed from the above description in a state of being sandwiched between the 1 st jig 51 and the 2 nd jig 52.

As shown in fig. 4, the 1 st jig 51 is disposed above the driving device 1 and the 2 nd jig 52. The 1 st jig 51 is H-shaped when viewed from the top-bottom direction. The 1 st jig 51 has 2 base portions 51a whose longitudinal direction is the axial direction when viewed in the axial direction, and a relay portion 51b that connects the base portions 51a to each other.

The 1 st jig 51 has a 1 st facing surface 51c facing the 2 nd jig 52 side. The 1 st facing surface 51c has 21

st holes

51d, 4 nd 2

holes

51f, and 4 rd 3 holes 51 g. The 1 st facing surface 51c of the present embodiment is not a surface integrally connected to each other, but includes a plurality of surfaces having different heights disposed across a step portion.

The 1 st hole 51d is provided in the relay portion 51 b. The 21 st holes 51D are arranged along the 1 st direction D1. The 1 st hole 51d accommodates a 1 st extruding portion 56. The 1 st extruding portion 56 is urged toward the 2 nd jig 52 by the force of the spring disposed inside. The tip ends of the 21 st extruding portions 56 are in contact with the outer peripheral surfaces of the motor main bodies 20 of the different geared motors 2, respectively. The 1 st pressing portion 56 presses the geared motor 2 toward the 2 nd jig 52.

2 of the 4 2 nd holes 51f are provided in one base portion 51a, and the other 2 are provided in the other base portion 51 a. In the 1

base part

51a, 2 nd holes 51f are arranged in parallel in the axial direction. The 2 nd hole 51f accommodates a 2 nd extruding portion 53. The 2 nd extruding portion 53 applies a force to the 2 nd jig 52 side by a force of a spring disposed inside, similarly to the 1 st extruding portion 56. The distal end surface of the 2 nd extruding portion 53 contacts the fixing portion 15 of the driving device 1. The 2 nd extruding portion 53 presses the frame 10 toward the 2 nd jig 52 side. In addition, the 2 nd extruding portion 53 is provided with a through hole 53 a.

2 of the 4 3 rd holes 51g are provided in one base portion 51a, and the other 2 are provided in the other base portion 51 a. In the 1

base part

51a, 23 rd holes 51g are arranged in parallel in the axial direction. A 1 st positioning pin 54 protruding from the 2 nd jig 52 toward the 1 st jig 51 side is inserted into the 3 rd hole 51 g. Thereby, the 1 st jig 51 and the 2 nd jig 52 are positioned with each other in a state where the 1 st jig 51 and the 2 nd jig 52 are stacked on each other.

As shown in fig. 5, the 2 nd jig 52 is disposed below the driving device 1 and the 1 st jig 51. The 2 nd jig 52 has a rectangular shape when viewed from the axial direction. The 2 nd jig 52 includes a block-shaped 2 nd jig

main body

52t, 4 prism portions 52a protruding from the 2 nd jig main body 52t toward the 1 st jig 51 side, 4 bosses 52b, and a bearing support portion 52 s.

The 2 nd jig main body 52t is provided with a 3 rd facing surface 52k extending in the axial direction from the bearing support portion 52 s. The 3 rd facing surface 52k faces the 1 st jig 51 side.

The 4 prism portions 52a have the 2 nd facing surface 52c facing the 1 st jig 51 side. The 2 nd opposed surface 52c is in contact with the 1 st opposed surface 51c of the 1 st jig 51 in a state where the 1 st jig 51 and the 2 nd jig 52 are stacked. The 2 nd opposed surface 52c is opened with a 4 th hole 52 d. The 1 st positioning pin 54 is fitted in the 4 th hole 52 d.

The boss 52b has a cylindrical shape. The distal end surface of the boss 52b contacts the fixing portion 15 of the driving device 1 urged by the 2 nd extruding portion 53 of the 1 st jig 51. Further, a 5 th hole 52f is opened in the front end surface of the boss 52 b. A 2 nd positioning pin 55 is fitted into the 5 th hole 52 f. The 2 nd positioning pin 55 is inserted into the fixing hole 15a provided in the fixing portion 15 and the through hole 53a provided in the 2 nd extruding portion 53 of the 1 st jig 51. Thereby, the driving device 1 and the 1 st jig 51 are positioned with respect to the 2 nd jig 52.

The 2 bearing support portions 52s are arranged in the 1 st direction D1. The front end surface 52v of the bearing support portion 52s is an arc surface curved in an arc shape. Bearing support portion 52s is inserted into notch portion 12a of frame 10. Further, the distal end surface 52v of the bearing support portion 52s supports the 2 nd bearing 8 from the opening side of the cutout portion 12 a.

Fig. 6 is a front view of the state where the 1 st jig 51, the 2 nd jig 52, and the driving device 1 are assembled. Fig. 7 is a sectional view of the 1 st jig 51, the 2 nd jig 52, and the driving device 1 taken along line VII-VII of fig. 6.

As shown in fig. 7, the driving device 1 is disposed in a gap provided between the 1 st facing surface 51c of the 1 st jig 51 and the 3 rd facing surface 52k of the 2 nd jig 52. The distance between the 1 st facing surface 51c and the 3 rd facing surface 52k in the 2 nd direction D2 is equal to the dimension of the drive device 1 in the 2 nd direction D2 in the predetermined range. Therefore, by assembling the driving device 1 between the 1 st facing surface 51c and the 3 rd facing surface 52k, the dimension of the driving device 1 in the 2 nd direction D2 can be reliably within the predetermined range.

According to the assembling method of the present embodiment, the 1 st jig 51 presses the frame 10 and the 2 nd gear drive motor 2 toward the 2 nd jig 52 at the 1 st extruding portion 56, respectively. Thereby, the 1 st extruding part 56 positions the frame 10 and the 2 nd gear drive motor 2 with respect to the 2 nd jig 52. More specifically, the 2 nd jig 52 supports the outer peripheral surface of the 2 nd bearing 8 from the 2 nd direction D2 on the distal end surface 52v of the bearing support portion 52s, and supports the outer peripheral surface of the motor main body 20 from the 2 nd direction D2 on the 3 rd facing surface 52 k. In this state, the operator engages the frame 10 and the 2-gear transmission motor 2 with each other.

According to the present embodiment, the 1 st jig 51 presses the frame 10 and the 2 nd geared motor 2 toward the 2 nd jig 52 from one side in the 2 nd direction D2, and the 2 nd jig 52 supports the 2 nd bearing 8 of the geared motor 2 from the other side in the 2 nd direction D2. This enables the frame 10 to be positioned opposite the geared motor 2. Further, by welding the frame 10 and the geared motor 2 in this state, the dimension in the 2 nd direction D2 can be reliably within a predetermined range, and the drive device 1 can be assembled.

While the embodiments of the present invention have been described above, the respective configurations and combinations thereof in the embodiments are examples, and additions, omissions, substitutions, and other modifications of the configurations can be made without departing from the spirit of the present invention. The present invention is not limited to the embodiments.

For example, the driving device may have a 3 rd geared motor in addition to the 1 st geared motor and the 2 nd geared motor, to further increase the power of the rack. In the above-described embodiment, the case where the motor main body is a stepping motor is described. However, with the above-described configuration, even when another type of motor is used as the motor main body, the effect of improving the driving force can be obtained.

In the present invention, it is assumed that there are 2 or more geared motors, but in a drive device having only 1 geared motor, the drive device can be made thinner by having the same configuration as that of the present invention.

In the above-described embodiment, the welding is exemplified as the joining means of the 2 nd bearing 8 and the 2 nd support portion 12, but the present invention is not limited thereto, and other joining means such as welding or brazing may be adopted.

Claims

1. A drive device, comprising:

a 2-pinion drive motor having a motor main body extending along a central axis and a pinion gear disposed on one side of the motor main body in an axial direction and rotated around the central axis by the motor main body;

a rack engaged with 2 of the pinions; and

a frame holding 2 of the geared motors and the racks,

a direction in which the central axes of 2 of the geared motors are aligned is set as a 1 st direction, and a direction perpendicular to the 1 st direction and the central axes is set as a 2 nd direction,

the dimension of the geared motor in the 2 nd direction is largest at the motor main body,

the motor main body protrudes from the frame to both sides in the 2 nd direction.

2. The drive device according to claim 1,

the gear transmission motor has:

a 1 st bearing disposed between the motor main body and the pinion gear, and rotatably supporting the pinion gear; and

a 2 nd bearing which is disposed along an end surface of the other side in the axial direction of the motor main body and supports the shaft of the motor main body so that the shaft of the motor main body can rotate,

the frame has:

a 1 st support portion that supports the 1 st bearing; and

a 2 nd support part supporting the 2 nd bearing,

the 1 st support part is in contact with the 1 st bearing from one side of the 2 nd direction,

the 2 nd support portion is engaged with the 2 nd bearing in a state of being separated from the 2 nd bearing in the 2 nd direction.

3. The drive device according to claim 2,

the 2 nd support portion has a cutout portion that is open to the other side in the 2 nd direction and that accommodates the 2 nd bearing.

4. The drive device according to claim 2 or 3,

2 of the gear motors are respectively provided with a transmission mechanism for reducing the speed of the power of the motor main body and transmitting the power to the pinion gear,

the 1 st bearing is disposed between the transmission mechanism and the pinion gear.

5. A method for manufacturing a drive device having 2 gear motors of a columnar shape centered on a central axis and a frame for supporting the 2 gear motors in a parallel arrangement,

using a 1 st jig and a 2 nd jig opposed to each other with a gap in the 2 nd direction,

disposing the frame and the geared motor at the gap,

the frame and 2 of the geared motors are pressed toward the 2 nd jig side by the 1 st jig, respectively, to position the frame and 2 of the geared motors with respect to the 2 nd jig, and in this state, the frame and 2 of the geared motors are engaged with each other.