drive device

Abstract

The utility model provides a kind of drive device that can seek to the consideration of assembly performance and shell strength.In the drive device equipped with the cut-off mechanism that the torque transmission of motor and power transmission mechanism is cut off, equipped with the fixing mechanism that fork shaft is fixed with fork by being through insertion in the through insertion hole of fork of fork shaft, fixing mechanism has: spring, the spring is housed in the first through hole of fork shaft;And pin, the pin can be moved along radial direction in the first through hole by the loading force of spring, and can protrude from the one opening portion of first through hole, bearing retaining portion of cylindrical shape that bearing is retained is provided in shell, bearing retaining portion has the end portion of annular shape that is all connected in the circumferential direction of bearing, and the third through hole that is through in the radial direction of bearing.

Description

Technical Field

[0001] This utility model relates to a drive device. Background Technology

[0002] Patent Document 1 discloses a housing for accommodating a motor and a power transmission mechanism, comprising a protrusion, a slit, and an oil drain hole. The outer ring of the bearing is mounted on the protrusion, the slit is located on the protrusion, and the oil drain hole penetrates the bottom wall below the slit. In the structure described in Patent Document 1, when assembling the bearing with the slip ring onto the housing using a tool, the tool can reach the slip ring through the oil drain hole and the slit.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-100421 Utility Model Content

[0006] The problem to be solved by the utility model

[0007] However, in the structure described in Patent Document 1, since a cutout is provided in the protruding part of the housing, the part holding the bearing is not connected in the entire circumferential region. Therefore, there is a risk of unit breakage related to the decrease in housing strength caused by the cutout or the sliding wear of the housing caused by the creep of the outer ring of the bearing.

[0008] This invention was made in view of the above circumstances, and its purpose is to provide a driving device that can achieve a balance between assembly performance and housing strength.

[0009] Methods for solving problems

[0010] This utility model is a driving device, equipped with: a housing, the housing housing a motor and a power transmission mechanism; and a cutting mechanism, the cutting mechanism having a fork shaft and a fork fixedly disposed on the fork shaft, cutting off the torque transmission between the motor and the power transmission mechanism, characterized in that it is equipped with a fixing mechanism, the fixing mechanism fixing the fork shaft and the fork by the fork shaft being inserted through a through insertion hole in the fork, the fixing mechanism having: a first through hole, the first through hole being disposed in the fork shaft and passing through the radial direction of the fork shaft; a spring, the spring being disposed in the first through hole and elastically deforming in the radial direction; a pin, the pin being able to move radially within the first through hole by means of the loading force of the spring, and being able to protrude from an opening of the first through hole; and a second through hole, the second through hole being disposed in the portion of the fork forming the through insertion hole and intersecting with the fork shaft. The fork has an opening opposite to the first through hole, which extends radially; and a locking member, which is installed in the second through hole of the fork and inserted by the end of the pin. The housing has a cylindrical bearing retainer, on which a bearing supporting the rotating member of the power transmission mechanism is installed. The bearing retainer holds the bearing and has: an annular end that is connected in the circumferential direction of the bearing and a third through hole extending radially through the bearing. The fork shaft and the fixing mechanism are disposed outside the bearing retainer. The fork has: an actuating part disposed inside the bearing retainer; a fixing part including the through insertion hole and fixed to the fork shaft; and an extension that extends through the third through hole to connect the actuating part and the fixing part.

[0011] Effects of the utility model

[0012] This invention achieves a balance between assembly performance and shell strength. Attached Figure Description

[0013] Figure 1 This is a diagram schematically illustrating the drive device in the embodiment.

[0014] Figure 2 This is a diagram used to illustrate the assembly process when assembling the fork shaft relative to the rear of the fork.

[0015] Figure 3 This is a diagram used to illustrate the state in which the fork shaft is fixed to the fork.

[0016] Figure 4 This is a diagram illustrating the state of the fork shaft before assembly.

[0017] Explanation of reference numerals in the attached drawings: 1 Drive unit, 2 Motor, 3 Housing, 4 Cutting mechanism, 5 Fixing mechanism, 11 Rotor, 12 Stator, 13 Rotor shaft, 31 Spacer wall, 32 Bearing retainer, 41 Fork shaft, 42 Fork, 51 Spring, 53 Pin, A: Assembled later, B: Pin not extended. Detailed Implementation

[0018] The driving device according to the embodiments of this utility model will now be described in detail. However, this utility model is not limited to the embodiments described below.

[0019] Figure 1 This diagram schematically illustrates the drive unit in the embodiment. The drive unit 1 is equipped with a motor 2, a power transmission mechanism, a housing 3, a cutting mechanism 4, and a fixing mechanism 5. The drive unit 1 is mounted on a vehicle and transmits power from the motor 2 to the wheels via the power transmission mechanism, driving the wheels. The drive unit 1 is a drive unit that houses the motor 2, power transmission mechanism, cutting mechanism 4, and fixing mechanism 5 inside the housing 3. Furthermore, in... Figure 1 The diagram of the power transmission device is omitted in the above.

[0020] Motor 2 is equipped with rotor 11, stator 12 and rotor shaft 13. Motor 11 and rotor shaft 13 rotate integrally. Stator 12 is fixed to housing 3. Rotor shaft 13 is rotatably supported relative to housing 3 by bearing 14.

[0021] The housing 3 houses the motor 2 and the power transmission mechanism. The housing 3 is composed of multiple housing components. Inside the housing 3, a motor chamber 21 for housing the motor 2 and a gear chamber 22 for housing the power transmission mechanism are formed. The housing 3 has: a partition wall that separates the motor chamber 21 from the gear chamber 22; and a cylindrical bearing retainer 32 that protrudes from the partition wall 31 toward the gear chamber 22.

[0022] The partition wall 31 is a wall that divides the internal space of the housing 3 into a motor chamber 21 side and a gear chamber 22 side. Bearings are mounted on the partition wall 31. The partition wall 31 rotatably supports the rotating component via the bearings. A through hole is provided in the partition wall 31 through which the rotor shaft 13 is inserted. A bearing 14 is mounted in this through hole. The bearing 14 supports the rotor shaft 13. Additionally, a bearing retaining portion 32 is provided in the partition wall 31, protruding towards the gear chamber 22 side and extending axially. The bearing retaining portion 32 is integrally formed with the partition wall 31. The bearing retaining portion 32 has a cylindrical structure that is coaxial with the through hole of the partition wall 31 where the bearing 14 is mounted.

[0023] The bearing retainer 32 holds the bearing within the gear chamber 22. The bearing retainer 32 has an annular end 32a that is continuously connected in the circumferential direction of the bearing, and a through hole 32b that extends radially through the bearing. The through hole 32b has an opening that is radially open. The fork 42 of the cutting mechanism 4 is inserted through the through hole 32b. The bearing supporting the rotating member of the power transmission mechanism is mounted on the bearing retainer 32. Thus, the partition wall 31 rotatably supports the rotating member of the motor 2 via the bearing 14, and rotatably supports the rotating member of the power transmission mechanism via the bearing mounted on the bearing retainer 32. Furthermore, in Figure 1 The illustration of the bearing held in the bearing retaining part 32 is omitted in the figure.

[0024] The cutting mechanism 4 is a mechanism that cuts off the motor 2. The cutting mechanism 4 cuts off the torque transmission between the motor 2 and the power transmission mechanism. The cutting mechanism 4 disconnects the power transmission path between the motor 2 and the power transmission mechanism. The cutting mechanism 4 has a fork shaft 41 and a fork 42 fixedly mounted on the fork shaft 41. The fork shaft 41 and the fork 42 are fixed by the fixing mechanism 5.

[0025] The fork shaft 41 is arranged parallel to the rotor shaft 13 and is configured to move axially. The fork shaft 41 is disposed outside the bearing retainer 32. One end of the fork shaft 41 is connected to an actuator. The fork shaft 41 moves axially by means of this actuator. The other end of the fork shaft 41 is mounted to the housing 3 via a sliding bearing. The fork shaft 41 is inserted through into a through insertion hole 4a provided in the fork 42. The through insertion hole 4a is a through hole that extends axially.

[0026] The fork 42 is integrally moved axially with the fork shaft 41. The fork 42 includes an actuating part 42a, a fixing part 42b, and an extension part 42c. The actuating part 42a is disposed inside the bearing retaining part 32 and connected to the sleeve inside the bearing retaining part 32. The fixing part 42b is disposed outside the bearing retaining part 32 and fixed to the fork shaft 41. The fixing part 42b includes a through insertion hole 4a. The extension part 42c extends in such a way that it connects the actuating part 42a and the fixing part 42b. The extension part 42c is inserted through into the through hole 32b of the bearing retaining part 32. In the cutting mechanism 4, the sleeve is moved axially by the fork 42, which can switch the state in which the motor 2 is connected to the power transmission mechanism and the state in which the motor 2 is disconnected from the power transmission mechanism. In the axial direction, the opening width of the through hole 32b is set according to the distance of the axial reciprocating motion of the fork 42.

[0027] The fixing mechanism 5 is a mechanism that fixes the fork shaft 41 and the fork 42. The fixing mechanism 5 is located on the outside of the bearing retaining part 32. The cutting mechanism 4 has a structure for post-assembly of the fork shaft 41. Figure 2As shown, in the process of assembling the cutting mechanism 4, the fork 42 is initially assembled, and then the fork shaft 41 is assembled to the fork 42. The fixing mechanism 5 has a structure in which the fork shaft 41 is inserted through into the through insertion hole 4a of the fork 42, thereby fixing the fork shaft 41 and the fork 42. That is, in the process of assembling the fork shaft 41 after assembling the fork 42, the fixing mechanism 5 has a structure that switches from a non-fixed state to a fixed state simultaneously with the completion of the through insertion of the fork shaft 41 into the through insertion hole 4a of the fork 42. The non-fixed state is the state in which the fork shaft 41 and the fork 42 are not fixed. The fixed state is the state in which the fork shaft 41 and the fork 42 are fixed.

[0028] like Figure 3 As shown, the fixing mechanism 5 includes a spring 51, a spring seat 52, a pin 53, and a locking member 54. The fixing mechanism 5 includes a through hole 41a provided in the fork shaft 41 and a through hole 42d provided in the fixing part 42b of the fork 42. The through hole 41a is a through hole that passes through the fork shaft 41 in the radial direction. The through hole 42d is provided in the part of the fork 42 that forms the through insertion hole 4a, and is located opposite to an opening of the through hole 41a, and is a through hole that passes through the fork shaft 41 in the radial direction.

[0029] Spring 51 is housed within through hole 41a and elastically deforms radially in the fork shaft 41. Spring seat 52 is the base of spring 51. Spring seat 52 is held by fixing part 42b of fork 42. Pin 53 is a pin that can move radially in through hole 41a along fork shaft 41 by means of the loading force of spring 51 and can protrude from another opening of through hole 41a. Spring seat 52 is provided at the other opening of through hole 41a. One opening of through hole 41a is configured such that the end of pin 53 can protrude. Loading force of spring 51 acts on pin 53 in the direction that causes pin 53 to protrude from one opening of through hole 41a. The end of pin 53 protrudes from one opening of through hole 41a and engages in locking hole of locking member 54. Locking member 54 is mounted in through hole 42d of fork 42. The locking member 54 is a fixing member that has been fixed in the through hole 42d of the fixing part 42b before the fork shaft 41 is inserted through the through insertion hole 4a. The locking member 54 is pressed into the through hole 42d. The locking member 54 has a locking hole into which the end of the pin 53 is inserted. The locking hole has an opening opposite to an opening of the through hole 41a of the fork shaft 41 and extends in the same direction as the through hole 41a. The depth of the locking hole is shallower than the length of the pin 53.

[0030] The drive unit 1 configured in this way has a structure that facilitates the subsequent assembly of the fork shaft 41. The method of temporarily assembling the slotted pin to the fixing part 42b and the fork shaft 41 in the narrow space of the housing 3 results in poor assembly performance. Therefore, by utilizing the spring 51 and pin 53 of the fixing mechanism 5, a mechanism is achieved that fixes the fork shaft 41 and fork 42 to the desired fixed position.

[0031] When assembling the cutting mechanism 4, such as Figure 1 As shown, firstly, the fixing part 42b of the fork 42 is inserted into the through hole 32b from the inside of the bearing retaining part 32. The fixing part 42b is positioned on the outside of the bearing retaining part 32 via the through hole 32b, forming an extension 42c that is inserted through the through hole 32b. Then, the fork shaft 41 is inserted through the through insertion hole 4a of the fork 42. In this process, as... Figure 2 As shown, a clamp 60 is mounted on the fork shaft 41. The clamp 60 is a support clamp used to prevent the pin 53 from protruding from the through hole 41a. The clamp 60 is a cylindrical component. Figure 4 As shown, the clamp 60 is mounted on the fork shaft 41 to cover one opening of the through hole 41a. With the clamp 60 holding the pin 53 in a position where it cannot extend, the fork shaft 41 is inserted into the through insertion hole 4a of the fork 42. During insertion, the end of the clamp 60 abuts against the fixing part 42b of the fork 42. During insertion of the fork shaft 41 with the clamp 60 abutting against the fixing part 42b, the pin 53 transitions from a position where it cannot extend due to the clamp 60 to a position where it cannot extend due to the fixing part 42b. Simultaneously with the fork shaft 41 being inserted to the desired position, the pin 53 extends, and the fixing is completed by the fixing mechanism 5. This allows for subsequent assembly of the fork shaft 41 with a single click.

[0032] As explained above, according to the embodiment, by having a structure that facilitates the reassembly of the fork shaft 41, it is possible to achieve a balance between the strength of the housing 3 and the assembly performance of the fork shaft 41.

[0033] Alternatively, the fixing mechanism 5 may also have an anti-loosening structure such as an anti-detachment plate. For example, the anti-detachment plate can be used to fix the locking member 54. The anti-detachment plate is disposed between the fixing part 42b and the fork shaft 41.

Claims

1. A driving device, equipped with: Housing, the housing housing the motor and the power transmission mechanism; and A cutting mechanism, comprising a fork shaft and a fork fixedly mounted on the fork shaft, cuts off the torque transmission between the motor and the power transmission mechanism. Its features are, The drive device is equipped with a fixing mechanism, which fixes the fork shaft to the fork by means of the fork shaft being inserted through the through insertion hole of the fork. The fixing mechanism has: A first through hole is provided in the fork shaft and extends radially through the fork shaft; A spring, which is housed within the first through hole and elastically deforms in the radial direction; A pin, which can move radially within the first through hole by means of the loading force of the spring, and can protrude from an opening of the first through hole; A second through hole, wherein the second through hole is disposed in the portion of the fork forming the through insertion hole at a position opposite to an opening of the first through hole, and penetrates in the radial direction; and A locking member, which is installed in the second through hole of the fork and inserted by the end of the pin, The housing has a cylindrical bearing retainer, on which the bearing supporting the rotating component of the power transmission mechanism is mounted, and the bearing retainer holds the bearing. The bearing retaining portion has: The annular end of the bearing, where all circumferences are connected; and A third through hole extending radially through the bearing, The fork shaft and the fixing mechanism are disposed on the outside of the bearing retaining portion. The fork has: The actuating part is disposed inside the bearing retaining part; A fixing part, the fixing part including the through insertion hole, is fixed to the fork shaft; and An extension portion is inserted through the third through hole to extend in a manner that connects the actuating portion and the fixing portion.

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