Vehicle door support member

Abstract

A vehicle door support member (1A) is provided with a brake (11) that imparts rotational resistance to a main shaft (12). The brake (11) is provided with: a rotating member (31) disposed in the first accommodation space (27) and coaxially fixed to a connecting shaft portion (12a) of the main shaft (12); and a load member (32) that is disposed on the outer periphery of the rotating member (31) and that applies a rotational load to the rotating member (31) by sliding the outer peripheral surface (31b) of the rotating member (31). A second accommodation space (28) is provided inside the accommodation section (7) at a position closer to the first end (7b) than the first accommodation space (27).

Description

Technical Field

[0001] The present invention relates to a door support member for a vehicle. Background Art

[0002] Patent document 1 discloses a vehicle door support member (hereinafter sometimes referred to as a "support member"), which is interposed between the vehicle body and the rear door, and supports the door on the vehicle body in a manner that allows it to be opened and closed. The support member includes a main shaft and a main shaft nut, and extension and retraction are achieved by the advance and retreat of the main shaft nut accompanying the rotation of the main shaft. Support members are of active and passive types. The active support member includes a motor that rotates the main shaft and can actively extend and retract. The passive support member does not include a motor, and extends and retracts by the rotation of the main shaft accompanying the opening and closing of the door. The passive support member disclosed in Patent document 1 includes a magnetic brake that generates resistance to extension and retraction through magnetic force.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-193643 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] Magnetic brakes can only generate a small braking torque. Therefore, for example, in passive support structures employing magnetic brakes, the magnetic brake must be connected to the input side of the gear mechanism used for deceleration. In other words, employing a magnetic brake in a support structure requires a combination of the magnetic brake and a gear mechanism. At least in this respect, employing a magnetic brake limits the structural freedom of the support structure.

[0008] An object of the present invention is to increase the degree of freedom in the structure of a vehicle door support member equipped with a brake.

[0009] Solutions for solving problems

[0010] One embodiment of the present invention provides a vehicle door support member comprising: a cylindrical accommodating portion having a first end and a second end on an opposite side to the first end, the first end being connected to one of a vehicle body and a door of the vehicle; a cylindrical cover portion being coaxially connected to the second end of the accommodating portion; a cylindrical movable member having a third end connected to the other of the vehicle body and the door, the side of the movable member opposite to the third end being accommodated in the cover portion, the movable member being movable axially relative to the cover portion; a main shaft being arranged in the cover portion and having a connecting shaft portion extending in the second end of the accommodating portion. ; a spindle nut, threadedly engaged with the spindle and connected to the movable member; a coil spring, applying force to the movable member in a direction extending from the cover portion; and a brake, arranged in a first accommodating space provided in the second end portion of the accommodating portion, to impart rotational resistance to the spindle, the brake comprising: a rotating member, arranged in the first accommodating space, coaxially fixed to the connecting shaft portion of the spindle; and a load member, arranged at the outer periphery of the rotating member, imparting a rotational load to the rotating member by sliding on the outer peripheral surface of the rotating member, and a second accommodating space is provided inside the accommodating portion at a position closer to the first end side than the first accommodating space.

[0011] The rotational resistance imparted to the main shaft by the brake is generated by the sliding of the outer peripheral surface of the rotating member coaxially fixed to the connecting shaft of the main shaft relative to the load member. Therefore, it is not necessary to adopt a gear mechanism in addition to the brake. In other words, there is no need to combine the brake and the gear mechanism. In addition, if a spacer is arranged in the second storage space, the configuration can be passive, and if a gear mechanism and a motor are arranged in the second storage space, the configuration can be active. At least in the above aspects, the degree of freedom of the structure of the vehicle door support member can be increased.

[0012] Effects of the Invention

[0013] According to the present invention, the degree of freedom of the structure of a vehicle door support member provided with a brake can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view of a vehicle equipped with a vehicle door support member according to an embodiment of the present invention.

[0015] Figure 2 It is a longitudinal sectional view of the vehicle door support member according to the first embodiment of the present invention.

[0016] Figure 3 This is an exploded perspective view of the accommodating portion and the components accommodated in the accommodating portion as viewed from the base end side of the vehicle door support member.

[0017] Figure 4This is an exploded perspective view of the accommodating portion and the components accommodated in the accommodating portion as viewed from the distal end side of the vehicle door support member.

[0018] Figure 5 This is an exploded perspective view of the brake.

[0019] Figure 6 This is the front view of the brake.

[0020] Figure 7 It is a longitudinal sectional view of a vehicle door support member according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0021] Figure 1 The vehicle 3 shown in the figure is provided with a vehicle door support device 2. The vehicle door support device 2 can use the vehicle door support member 1A of the first embodiment and the vehicle door support member 1B of the second embodiment of the present invention (see FIG. Figure 2 、 Figure 7 ). A vehicle door support member 1A of a first embodiment and a vehicle door support member 1B of a second embodiment described later (see Figure 2 、 Figure 7 ) are equipped with a brake 11. In the following description, in order to collectively refer to the vehicle door support member including both the vehicle door support members 1A and 1B, the reference numeral 1 may be used. In addition, in the following description, the vehicle door support member is simply referred to as the support member, and the vehicle door support device is simply referred to as the support device.

[0022] Continue to refer to Figure 1 The support device 2 includes a pair of support members 1. One end of each support member 1 is connected to the vehicle body 3a, and the other end is connected to the rear door (door) 3b. In the case of a passive type, each support member 1 is driven by the opening and closing of the rear door 3b to extend and retract, and in the case of an active type, it is driven by a motor to extend and retract. Typically, one of the pair of support members 1 is the passive support member 1A of the first embodiment (see Figure 2 ), the other is an active type supporting member 1B of the second embodiment (refer to Figure 7 However, both of the pair of support members 1 may be the support members 1A of the first embodiment (see Figure 2 ). In addition, both of the pair of support members 1 may be the support members 1B of the second embodiment (see Figure 7 ). Furthermore, one of the pair of support members 1 may be the vehicle support member 1A of the first embodiment and the vehicle support member 1B of the second embodiment (see Figure 2 、 Figure 7), the other one is a supporting member other than the supporting member 1A of the first embodiment and the supporting member 1B of the second embodiment. For example, one of the pair of supporting members 1 may be the passive supporting member 1A of the first embodiment (see Figure 2 ), and the other is an active supporting member but does not have a brake.

[0023] In the following description, the terms "base end" and "base end side" may be used to refer to the end portion of the support member 1 connected to the vehicle body 3a. In addition, the terms "terminal end" and "terminal side" may be used to refer to the end portion of the support member 1 connected to the rear door 3b.

[0024] (First embodiment)

[0025] Reference Figure 2 The passive support member 1A is generally in the shape of a long, thin rod. The support member 1A includes a cylindrical fixed housing 5 and a cylindrical movable housing (movable member) 6 that is thinner than the fixed housing 5. The movable housing 6 can move forward and backward relative to the fixed housing 5. Figure 2 This shows a state in which the movable housing 6 is most protruded relative to the fixed housing 5 .

[0026] The fixed housing 5 includes a cylindrical housing portion 7 and a cylindrical cover portion 8 coaxially connected to the distal end (second end) 7b of the housing portion 7. In this embodiment, the base end of the fixed housing 5, more specifically, the base end (first end) 7a of the housing portion 7, is connected to the vehicle body 3a via an axial end member 9A. The base end 7a of the housing portion 7 is closed by the axial end member 9A. The distal end 7b of the housing portion 7 is open. Both the distal end 8a and the base end 8b of the cover portion 8 are open.

[0027] In this embodiment, the distal end (third end) 6a of the movable housing 6 is connected to the rear door 3b via a shaft end member 9B. The distal end 6a of the movable housing 6 is sealed by the shaft end member 9B. The base end 6b of the movable housing 6 is open. The base end of the movable housing 6 is housed within the cover portion 8, and the movable housing 6 is capable of linear movement relative to the cover portion 8 along the axis L.

[0028] A brake 11 is housed within the distal end 7b of the housing 7 of the fixed housing 5. Meanwhile, a spindle 12 is housed within the cover 8 of the fixed housing 5. The spindle 12 is rotatably held by a bearing 13 secured to the base end 8b of the cover 8. A spindle nut 14 is threadedly engaged with the spindle 12. The spindle 12 includes a connecting shaft portion 12a at its base end. The connecting shaft portion 12a extends from the base end 8b of the cover 8 into the distal end 7b of the housing 7. As will be described in detail later, the brake 11 is provided on the connecting shaft portion 12a of the spindle 12, thereby imparting rotational resistance to the spindle 12. A guide tube 16 is provided within the fixed housing 5 to surround the spindle 12. The guide tube 16 guides the spindle nut 14, preventing it from rotating and allowing it to move straight. Therefore, when the spindle nut 14 moves straight toward the distal end 8a or base end 8b of the cover 8, the spindle 12 rotates in a direction corresponding to the straight-ahead direction. In a supporting member 1B of a second embodiment described below, when the spindle 12 is driven and rotated by the motor 42 , the spindle nut 14 moves straight toward the distal end 8 a or the proximal end 8 b of the cover 8 depending on the direction of rotation.

[0029] The movable housing 6 includes a push rod 17 and an outer tube 18. The push rod 17 is cylindrical and open at both ends and is positioned between the spindle 12 and the guide tube 16. The base end of the push rod 17 is fixed to the spindle nut 14. The outer tube 18 is cylindrical and open at both ends and is positioned inside the cover portion 8 of the fixed housing 5. The shaft end member 9B is fixed to the distal end of the outer tube 18 of the push rod 17.

[0030] A coil spring 19 is disposed between the push rod 17 and the outer tube 18. The coil spring 19 is compressively mounted on the distal end of the movable housing 6, more specifically, between the distal end of the outer tube 18 and the base end 8b of the cover 8 of the fixed housing 5. The coil spring 18 elastically biases the movable housing 6 in the direction of extending from the cover 8.

[0031] Next, the accommodation portion 7 of the fixed housing 5 and the components accommodated therein will be described.

[0032] Reference Figures 2 to 4 A partition wall 7d having a through hole 7c is provided at the distal end 7b of the housing portion 7. Meanwhile, a shaft end member 9A is fitted into and fixed to the opening of the proximal end 7a of the housing portion 7.

[0033] Within the housing 7, a spacer 21, a brake case 22, an auxiliary case 23, a spacer 24, a retainer 25, and a gasket 26 are housed side by side in order from the distal end 7a toward the proximal end 7b. The spacer 21 and gasket 26 are made of an elastic material such as elastomer. The brake case 22, auxiliary case 23, spacer 24, and retainer 25 are made of a resin material such as polyamide.

[0034] The spacer 21 is generally annular and is positioned at the extreme end of the housing 7a. A through-hole 21a is formed in the spacer 21, through which the connecting shaft portion 12a of the main shaft 12 passes. The spacer 21 is held between the partition wall 7d of the housing 7 and the brake housing 22, thereby positioning the spacer 21 in the axial direction. The protrusion 7e provided on the partition wall 7d fits into a recess 21b provided on the outer periphery of the spacer 21, thereby positioning the spacer 21 in the rotational direction about the axis L.

[0035] The brake housing 22 includes a cylindrical portion 22a. An end wall 22b is provided at the distal end of the cylindrical portion 22a, and the proximal end of the cylindrical portion 22a is open. The brake housing 22 is positioned within the distal end portion 7b of the accommodating portion 7, with its distal end adjacent to the spacer 21 and its proximal end adjacent to the auxiliary housing 23. A through-hole 22c is provided in the end wall 22b, through which the connecting shaft portion 12a of the main shaft 12 passes.

[0036] The auxiliary housing 23 includes a cylindrical portion 23a. An end wall 23b is provided at the distal end of the cylindrical portion 23a, with the proximal end of the cylindrical portion 23a being open. The auxiliary housing 23 is positioned within the distal end 7a of the accommodating portion 7, with its distal end adjacent to the brake housing 22. A through-hole 23c is provided in the end wall 23b, through which the connecting shaft portion 12a of the main shaft 12 extends.

[0037] The brake housing 22 is sandwiched between the spacer 21 and the auxiliary housing 23, thereby positioning the brake housing 22 in the axial direction. A protrusion 22d provided on the end wall 22b of the brake housing 22 fits into a recess 21c provided on the spacer 21, thereby positioning the spacer 21 and the brake housing 22 relative to each other in the rotational direction about the axis L. A protrusion 22e provided on the base end of the cylindrical portion 22a of the brake housing 22 fits into a recess 23d provided on the distal end of the cylindrical portion 23a of the auxiliary housing 23, thereby positioning the brake housing 22 and the auxiliary housing 23 relative to each other in the rotational direction about the axis L.

[0038] The first accommodation space 27 is defined by being surrounded by the end wall 22b of the brake housing 22, the cylindrical portion 22a of the brake housing 22, and the end wall 23b of the auxiliary housing 23. As will be described later, the brake 11 is accommodated in the first accommodation space 27.

[0039] A second accommodating space 28 is provided inside the accommodating portion 5 at a position closer to the proximal end than the first accommodating space 27 , more specifically, at a position closer to the proximal end than the auxiliary housing 23 .

[0040] The spacer 24 includes: a spacer body 24a extending into the second accommodating space 28; a first retained portion 24b on the front end side, which is embedded in and retained by the opening of the cylindrical portion 23a of the auxiliary housing 23; and a second retained portion 24c, which is retained by the base end 5b of the accommodating portion 5. A retainer 25, which is cylindrical and open at both ends, is attached to the second retained portion 24c of the spacer 24. A step portion 25a provided on the inner circumferential surface of the retainer 25 engages with a step portion 24d provided on the outer circumferential surface of the second retained portion 24c. In addition, the distal end of the shaft end member 9A is pressed against the most proximal end of the retainer 25 via the flange 26a of the gasket 26. As a result, the axial position of the spacer 24 is positioned together with the retainer 25.

[0041] Below, also refer to Figure 5 and Figure 6 , the brake 11 will be described.

[0042] The brake 11 includes a short cylindrical rotating member 31 and a coil spring (load member) 32 . The rotating member 31 and the coil spring 32 are arranged in the first accommodation space 27 .

[0043] A through-hole 31a extending axially therethrough is formed in the rotating member 31. The connecting shaft portion 12a of the main shaft 12, which enters the first accommodation space 27 via the through-hole 7c of the partition wall 7d, the through-hole 21a of the spacer 21, and the through-hole 22c of the brake housing 22, is press-fitted and secured to the through-hole 31a. The connecting shaft portion 12a and the through-hole 31a have a generally rectangular cross-section, thereby securing the rotating member 31 to the connecting shaft portion 12a in a manner that prevents relative rotation about the axis L.

[0044] A rotation retaining portion 22f is provided within the brake housing 22. This rotation retaining portion 22f is a shallow cylindrical depression defined by the surface of the end wall 22b facing the first accommodating space 27 and the inner surface of the portion of the tubular portion 22a connected to the end wall 22b. This rotation retaining portion 22f holds the distal end of the rotating member 31 rotatably about the axis L.

[0045] A spring retaining portion (load retaining portion) 22g is provided within the brake housing 22. The distal end of the spring retaining portion 22g is adjacent to the rotating member retaining portion 22f and has a larger diameter than the rotating member retaining portion 22f. The coil spring 32 includes a plurality of coil portions 32a and a pair of end portions 32b. The coil portions 32a of the coil spring 32 are retained by the spring retaining portion 22g. Furthermore, a locking portion 22h is provided on the inner surface of the cylindrical portion 22a of the brake housing 22 to secure the pair of end portions 32b of the coil spring 32.

[0046] The coil portion 32a of the coil spring 32 elastically clamps the cylindrical surface (outer peripheral surface) 31b of the rotating member 31. Therefore, when the rotating member 31 rotates about the axis L along with the main shaft 12, the cylindrical surface 31b of the rotating member 31 slides relative to the coil portion 32a of the coil spring 19. The frictional resistance created by sliding relative to the elastically clamped coil portion 32a of the coil spring 19 acts as rotational resistance to the rotating member 31 and, in turn, the main shaft 12.

[0047] When Figure 1 When the rear door 3b, shown in the open state, moves toward closing, the support member 1A contracts. More specifically, the movable housing 6 linearly moves along the axis L toward the cover portion 8 of the fixed housing 5. This linear movement of the movable housing 6 also linearly moves the spindle nut 14 along the axis L, causing the spindle 12 to rotate. As described above, the spindle 12 experiences rotational resistance from the brake 11. Therefore, the brake 11 applies a braking force to the closing action of the rear door 3b.

[0048] The brake 11 included in the support member 1A of this embodiment generates braking force through sliding resistance against the rotating member 31, not through magnetic resistance. Therefore, by adjusting the tightening force of the coil portion 32a of the coil spring 32 and the number of coil portions 32a, a braking torque greater than that of a magnetic brake can be achieved. For this reason, while the support member 1A of this embodiment includes the brake 11, it does not require a combination with a gear mechanism to reduce the torque acting on the brake 11.

[0049] The brake 11 is directly connected to the connecting shaft 12a of the main shaft 12. This structure has a single connection point, which is simpler than the structure of a magnetic brake connected to the main shaft via a gear mechanism, that is, a structure with two connection points. Even if the connection point is loose, the impact on braking performance is minimal.

[0050] When the number of coil portions 32a of the coil spring 32 is increased to improve the braking force of the brake 11, the length of the rotating member 31 in the direction of the axis L is increased, and sometimes the length of the brake housing 22 in the direction of the axis L also needs to be increased. However, in this case, if the thickness of the spacer 21 is set to be thinner by the amount of the increase in the length of the brake housing 22 in the direction of the axis L, it is not necessary to replace the accommodating portion 7 of the fixed housing 5 with a member that is longer in the direction of the axis L.

[0051] The base end of the fixed housing 5 in this embodiment may be connected to the rear door 3 b , and the front end of the movable housing 6 may be connected to the vehicle body 3 a .

[0052] (Second embodiment)

[0053] Figure 7The active support member 1B of the second embodiment of the present invention is shown. In these drawings, the same or similar elements as those of the first embodiment are marked with the same reference numerals. Regarding this embodiment, the structure and function not specifically mentioned in the following description are the same as those of the first embodiment.

[0054] In place of the spacer 21 housed in the second accommodation space 28 of the accommodation portion 7 in the support member 1A of the first embodiment, the gear mechanism 41 and the electric motor 42 are housed in the second accommodation space 28 of the accommodation portion 7 in the support member 1B of this embodiment. More specifically, the gear mechanism 41 and the motor 42 are arranged in this order from the stopper 11 toward the base end 7a of the fixing portion 7.

[0055] The gear mechanism 41 of this embodiment includes two planetary gear units 43 and 44. With respect to the motor 42, the input side is the planetary gear unit 43, and the output side is the planetary gear unit 44. The planetary gear units 43 and 44, respectively, include fixed housings 43a and 44a (equipped with internal gears); sun gears 43b and 44b; multiple planetary gears 43c and 44c; and planetary carriers 43d and 44d.

[0056] The sun gear 43b of the input-side planetary gear unit 43 is connected to the output shaft 42a of the motor 42. In other words, the sun gear 43b constitutes the input portion of the gear mechanism 41. Furthermore, the planetary carrier 43d of the input-side planetary gear unit 43 is connected to the sun gear 44b of the output-side planetary gear unit 44. Furthermore, the planetary carrier 44d of the output-side planetary gear unit 44 is connected to the connecting shaft 12a of the main shaft 12. In other words, the planetary carrier 43d constitutes the output portion of the gear mechanism 42. The rotation of the output shaft 42a of the motor 42 is reduced in speed by the gear mechanism 41 and then transmitted to the main shaft 12.

[0057] The planetary gear units 43 and 44 of the gear mechanism 41 are fitted into and held by the cylindrical portion 23a of the auxiliary housing 23. The outer diameter of the housings 43a and 44a is set to be the same as the outer diameter of the first held portion 24b of the spacer 24 in the support member 1A of the first embodiment.

[0058] As described above, if the spacer 24 is disposed in the second storage space 28 of the storage portion 7, a passive support member 1A (first embodiment) can be configured. If the gear mechanism 41 and the motor 42 are disposed in the second storage space 28, an active support member 1B can be configured. This, along with the fact that the passive support member 1A does not require a gear mechanism, increases the degree of freedom in the structure of the support member 1.

[0059] Description of Reference Numerals

[0060] 1, 1A, 1B: Vehicle door support member; 2: Vehicle door support device; 3: Vehicle; 3a: Vehicle body; 3b: Rear door; 5: Fixed housing; 6: Movable housing; 6a: Terminal end (third end); 6b: Base end; 7: Accommodating portion; 7a: Base end (first end); 7b: Terminal end (second end); 7c: Through hole; 7d: Partition wall; 7e: Protrusion; 8: Cover portion; 8a: Terminal end; 8b: Base end; 9A, 9 B: Shaft end member; 11: Brake; 12: Spindle; 12a: Connecting shaft; 13: Bearing; 14: Spindle nut; 16: Guide tube; 17: Push rod; 18: Outer cylinder; 19: Coil spring; 21: Spacer; 21a: Through hole; 21b: Recess; 21c: Recess; 22: Brake housing; 22a: Cylindrical portion; 22b: End wall; 22c: Through hole; 22d: Protrusion; 22e: Protrusion; 22f: : Rotating member holding portion; 22g: Spring holding portion; 22h: Locking portion; 23: Auxiliary housing; 23a: Cylindrical portion; 23b: End wall; 23c: Through hole; 23d: Recess; 24: Spacer; 24a: Spacer body; 24b: First held portion; 24c: Second held portion; 24d: Step portion; 25: Retainer; 25a: Step portion; 26: Gasket; 26a: Flange; 27: First receiving portion Space; 28: Second accommodating space; 31: Rotating member; 31a: Through hole; 31b: Cylindrical surface; 32: Coil spring (load member); 32a: Coil portion; 32b: End portion; 41: Gear mechanism; 42: Motor; 42a: Output shaft; 43, 44: Planetary gear unit; 43a, 44a: Housing; 43b, 44b: Sun gear; 43c, 44c: Planetary gears; 43d, 44d: Planetary carrier.

Claims

1. A vehicle door support member comprising: a cylindrical accommodating portion having a first end and a second end opposite to the first end, wherein the first end is connected to one of a vehicle body and a door of the vehicle; a cylindrical cover portion coaxially connected to the second end portion of the accommodating portion; a cylindrical movable member having a third end connected to the other of the vehicle body and the door, a side of the movable member opposite to the third end being accommodated in the cover portion, and the movable member being movable relative to the cover portion in the axial direction; a main shaft, disposed in the cover portion, and having a connecting shaft portion extending into the second end portion of the accommodating portion; a spindle nut, threadedly engaged with the spindle and connected to the movable member; a coil spring for applying force to the movable member in a direction extending from the cover portion; as well as a brake disposed in a first accommodation space provided in the second end portion of the accommodation portion, and applying rotational resistance to the main shaft; The brake has: a rotating member, disposed in the first accommodation space and coaxially fixed to the connecting shaft portion of the main shaft; as well as A load member is arranged on the outer periphery of the rotating member and applies a rotational load to the rotating member by sliding on the outer peripheral surface of the rotating member. A second storage space is provided inside the storage portion at a position closer to the first end than the first storage space.

2. The vehicle door support member according to claim 1, wherein have: a cylindrical brake housing disposed in the second end portion of the accommodating portion; and A cylindrical auxiliary housing is disposed in the accommodating portion so as to be coaxially connected to the first end portion of the brake housing. The first accommodating space is defined by the brake housing and the auxiliary housing. The second accommodating space is provided on the first end side of the auxiliary housing. The brake housing includes: a through hole for the connecting shaft to pass through the first accommodation space; a rotating member holding portion for holding the rotating member in the first accommodation space so as to be rotatable; as well as The load member holding portion holds the load member.

3. The vehicle door support member according to claim 2, wherein: The auxiliary housing includes a cylindrical portion that is open on the first end side.

4. The vehicle door support member according to claim 3, wherein: The load member is a coil spring.

5. The vehicle door support member according to any one of claims 2 to 4, wherein: A spacer is provided in the second storage space. The spacer comprises: a spacer body extending and disposed in the second accommodation space; a first held portion, embedded in and held by the cylindrical portion of the auxiliary housing; as well as The second held portion is held at the first end portion of the accommodating portion.

6. The vehicle door support member according to any one of claims 2 to 4, wherein: have: a gear mechanism embedded in and held in the cylindrical portion of the auxiliary housing, the gear mechanism including an input portion on the first end side and an output portion on the second end side, wherein the gear mechanism causes the output portion to rotate at a speed slower than the input portion; and a motor, disposed in the second accommodation space, The output shaft of the motor is connected to the input portion of the gear mechanism, The connecting shaft portion passes through the auxiliary housing and is connected to the output portion of the gear mechanism.

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