One-way clutch and rotary damper including the same

Abstract

To achieve downsizing with a small number of components.SOLUTION: A one-way clutch includes: a shaft attachment member 12 attached to a rotary shaft part 23 of a damper device 20; a slide member 13 which is supported by the shaft attachment member 12 so as to be movable along a radial direction of a shaft P and has claw parts 131; and a gear member 11 in which a plurality of external teeth 112 are provided on an outer peripheral surface and a plurality of internal teeth 113 are provided on an inner peripheral surface. In a case where the gear member 11 rotates around the shaft P, when the gear member rotates in one direction, the claw parts 131 of the slide member 13 engage with the internal teeth 113 to cause the gear member to rotate with the shaft attachment member 12. When the gear member rotates in the other direction, the internal teeth 113 and the claw parts 131 slide and the slide member 13 is separated from the internal teeth 113 to cause the gear member to rotate independently from the shaft attachment member 12. The shaft attachment member 12 has: a through hole 121A which penetrates through the shaft attachment member in a radial direction and in which the slide member 13 is disposed; and an insertion part which is provided at one axial end along the shaft P and into which the rotary shaft part 23 is inserted along an axial direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a one-way clutch and a rotary damper equipped with the same. [Background technology]

[0002] Patent Document 1 discloses a one-way clutch that is used, for example, in a door, and enables the door to be opened with a lighter action and closed with a slower action. The one-way clutch described in Patent Document 1 has a configuration that realizes a smaller size than conventional one that uses multiple planetary gears.

[0003] The one-way clutch described in Patent Document 1 is configured such that a sliding member having a claw portion is supported by an inner member within an outer member having external teeth on the outer peripheral surface of a cylinder and internal teeth on the inner peripheral surface so as to be slidable in the radial direction of the outer member. The sliding member rotates together with the rotor shaft of the damper device to which rotational resistance is applied, and the claw portion is configured to engage with the internal teeth of the outer member and retract from the internal teeth depending on the direction of rotation. As a result, the outer member rotates together with the sliding member depending on the direction of rotation, and rotational resistance is applied. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6920728 Summary of the Invention [Problem to be solved by the invention]

[0005] The one-way clutch described in Patent Document 1 has a through hole in the slide member, into which the rotor shaft of the damper device is inserted, and a cover member that closes the opening of the outer member restricts the axial movement of the slide member. In other words, this one-way clutch requires an inner member and a cover member to support the slide member, but in consideration of assembly time or product cost, it is desirable to reduce the number of parts.

[0006] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, an object of the present invention is to provide a one-way clutch that is compact and has a reduced number of parts, and a rotary damper equipped with the one-way clutch. [Means for solving the problem]

[0007] In order to achieve this object, the present invention provides a damper device comprising: a shaft mounting member that is mounted on a rotating shaft of a damper device to which rotational resistance is applied and rotates together with the rotating shaft about the axis of the rotating shaft; a slide member that is supported by the shaft mounting member so as to be movable along the radial direction of the shaft and has a claw portion at an end in the radial direction; and a gear member that is cylindrical and extends along the axis, houses the shaft mounting member and the slide member inside, and has a plurality of external teeth provided on its outer peripheral surface along the circumferential direction of the shaft and a plurality of internal teeth provided on its inner peripheral surface along the circumferential direction. When the gear member rotates around the axis, the claw portion of the slide member meshes with the internal teeth, causing it to rotate together with the shaft mounting member, and when the gear member rotates in one direction, the internal teeth and the claw portion slide and the slide member moves away from the internal teeth, causing it to rotate independently of the shaft mounting member. The shaft mounting member has a through hole that penetrates in the radial direction and in which the slide member is disposed, and an insertion portion that is provided at one end in the axial direction along the axis and into which the rotating shaft portion is inserted along the axial direction. Effect of the Invention

[0008] The present invention can be made compact with a small number of parts. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a rotary damper according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the rotary damper according to the embodiment. [Diagram 3] FIG. 3 is a cross-sectional view taken along the line III-III of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. [Diagram 5] FIG. 5 is a diagram for explaining the operation of the one-way clutch. [Figure 6] FIG. 6 is a perspective view of a modified shaft mounting member. [Figure 7] FIG. 7 is a cross-sectional view of a rotary damper equipped with a modified shaft mounting member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a one-way clutch and a rotary damper including the same according to the present invention will be described with reference to the drawings.

[0011] Fig. 1 is a perspective view of a rotary damper 1 of this embodiment. Fig. 2 is an exploded perspective view of the rotary damper 1 of this embodiment. Fig. 3 is a cross-sectional view taken along the line III-III in Fig. 1. Fig. 4 is a cross-sectional view taken along the line IV-IV in Fig. 1.

[0012] The rotary damper 1 includes a one-way clutch 10 and a damper device 20. The one-way clutch 10 is attached to the damper device 20 so as to be rotatable relative to the damper device 20 about an axis P. For ease of explanation, the direction along the axis P is taken as the up-down direction, and the one-way clutch 10 is disposed on the upper side and the damper device 20 on the lower side. In addition, in the circumferential direction about the axis P, the clockwise direction is taken as one direction, and the counterclockwise direction is taken as the other direction.

[0013] (About One-Way Clutch 10) The one-way clutch 10 includes a gear member 11, a shaft mounting member 12, and a slide member 13.

[0014] The gear member 11 is a cylindrical member extending along the axis P. The upper end of the gear member 11 is open. The lower end of the gear member 11 is provided with an annular portion 111. The shaft mounting member 12 is adapted to be inserted into the inner circular portion of the annular portion 111.

[0015] A plurality of external teeth 112 protruding radially outward are provided along the circumferential direction on the outer peripheral surface of the gear member 11. A plurality of internal teeth 113 protruding radially inward are provided along the circumferential direction on the inner peripheral surface of the gear member 11. Each of the plurality of internal teeth 113 has an engagement surface 113A and a sliding surface 113B.

[0016] The engagement surface 113A is a surface of the internal teeth 113 that intersects with the circumferential direction and is downstream in one direction, and is formed so as to be recessed inward in the circumferential direction from the tip of the internal teeth 113. When the gear member 11 rotates in the other direction, a claw portion 131 of the slide member 13 described below fits into the recessed portion of the engagement surface 113A. The shaft mounting member 12 that supports the slide member 13 rotates together with the gear member 11 with the slide member 13 hooked on the internal teeth 113 of the gear member 11.

[0017] The sliding surface 113B is a surface of the internal teeth 113 that intersects with the circumferential direction and is on the upstream side in one direction, and is formed at an incline so that the tip of the internal teeth 113 is on the downstream side in one direction. When the gear member 11 rotates in one direction, the claw portion 131 of the slide member 13 described below slides on the sliding surface 113B and moves in a direction away from the internal teeth 113. In other words, when the gear member 11 rotates in one direction, the claw portion 131 does not get caught on the internal teeth 113, and the slide member 13 rotates freely with respect to the shaft mounting member 12 that supports the slide member 13.

[0018] The shaft mounting member 12 is disposed inside the gear member 11, and is mounted on the rotating shaft portion 23 of the damper device 20. The shaft mounting member 12 rotates together with the rotating shaft portion 23 of the damper device 20 about the axis P, and rotates independently of the gear member 11. The shaft mounting member 12 is formed from, for example, resin or metal.

[0019] The shaft mounting member 12 has a main body portion 121 and a cover portion 122 .

[0020] The main body 121 has a cylindrical shape extending along the axis P. The main body 121 has a through hole 121A that penetrates in the radial direction and in which the slide member 13 is disposed. In the drawing, the through hole 121A is rectangular, but it may have any shape and size that allows the slide member 13 to be disposed movably along the radial direction.

[0021] The main body 121 has an insertion portion 121B provided at a lower end portion, into which the rotating shaft portion 23 of the damper device 20 is inserted along the axis P. The rotating shaft portion 23 is inserted into the insertion portion 121B. The insertion portion 121B may have any shape and size that allows the shaft mounting member 12 to be mounted on the rotating shaft portion 23 so that the shaft mounting member 12 does not spin freely relative to the rotating shaft portion 23. With the rotating shaft portion 23 inserted into the insertion portion 121B, the shaft mounting member 12 is fixed to the damper device 20, for example, by being pressed in.

[0022] The lid portion 122 is provided at the upper end of the main body portion 121. When the gear member 11 and the shaft mounting member 12 are mounted, the lid portion 122 closes the opening at the upper end of the gear member 11 and prevents the gear member 11 from falling off from above. The lid portion 122 may close the opening of the gear member 11 so as to cover it from above, or may be a circular portion having the same diameter as the opening of the gear member 11 and fitted into the opening of the gear member 11. Note that even when the opening of the gear member 11 is closed by the lid portion 122, the gear member 11 and the shaft mounting member 12 are configured to rotate relative to each other. Note that the shaft mounting member 12 does not need to have the lid portion 122.

[0023] The slide member 13 extends long in one direction and has claws 131 at both ends. The claws 131 extend in a direction inclined with respect to the longitudinal direction of the slide member 13. The slide member 13 is disposed in the through hole 121A of the shaft mounting member 12, and is thereby movable in the radial direction of the shaft P. The length of the slide member 13 in the longitudinal direction is at least longer than the diameter of an imaginary circle C (see FIG. 4) that is centered on the shaft P and passes through the tips of the internal teeth 113 of the gear member 11.

[0024] The slide member 13 has both ends inclined in one direction when supported by the shaft mounting member 12 as shown in FIG. 4. The inclined portions correspond to the claw portions 131. The claw portions 131 are shaped so that their tips can enter recesses in the engagement surfaces 113A of the internal teeth 113 when the gear member 11 rotates in the other direction. In addition, the outer surfaces of the claw portions 131 in the longitudinal direction of the slide member 13 (hereinafter referred to as inclined surfaces 131A) are inclined with respect to the longitudinal direction, and are shaped so that they can slide on the sliding surfaces 113B of the internal teeth 113 when the gear member 11 rotates in one direction. The operation of the slide member 13 will be described later.

[0025] (Regarding the damper device 20) The damper device 20 includes a housing 21 , a rotor blade 22 , a rotating shaft portion 23 , a cover body 24 , and a viscous body 25 .

[0026] The housing 21 has a cylindrical space 21A. The housing 21 supports a lower end of a rotating shaft portion 23 in the space 21A so as to be rotatable about an axis P. A rotor blade 22 is provided at the lower end of the rotating shaft portion 23. The rotor blade 22 rotates together with the rotating shaft portion 23 in the space 21A of the housing 21. A viscous body 25, which is a viscous fluid such as silicone oil, is contained in the housing 21. The viscous body 25 applies a rotational resistance to the rotor blade 22 rotating in the space 21A of the housing 21. The rotational resistance is applied to the rotating shaft portion 23 by the viscous body 25 via the rotor blade 22.

[0027] The housing 21 is provided with a lid 24 that closes the space 21A while supporting the rotating shaft portion 23 rotatably about an axis P with the rotating shaft portion 23 protruding upward. The lid 24 has, for example, an O-ring, and prevents the viscous material 25 from leaking out of the space of the housing 21.

[0028] (Operation of rotary damper 1) The operation of the rotary damper 1 configured as above will be described with reference to Figures 4 and 5. Figure 5 is a diagram for explaining the operation of the one-way clutch 10, and like Figure 4, corresponds to a cross section taken along the line IV-IV of Figure 1.

[0029] The length of the slide member 13 is longer than the diameter of a circle C shown in Fig. 4. Therefore, at least one of the claw portions 131 at both ends of the slide member 13 is located outside the circle C. Therefore, when the gear member 11 rotates, the internal teeth 113 of the gear member 11 comes into contact with the one of the claw portions 131.

[0030] When the gear member 11 rotates in one direction, as shown in Fig. 4, the sliding surface 113B of the internal teeth 113 of the gear member 11 comes into contact with the inclined surface 131A of one of the claw portions 131. When one of the claw portions 131 is pressed in one direction by the internal teeth 113, the slide member 13 moves in a direction away from the internal teeth 113 while the inclined surface 131A of one of the claw portions 131 slides on the sliding surface 113B of the internal teeth 113. Therefore, when the gear member 11 rotates in one direction, the internal teeth 113 of the gear member 11 is not caught by the claw portion 131 of the slide member 13. In other words, the gear member 11 rotates freely with respect to the shaft mounting member 12 that supports the slide member 13.

[0031] When the gear member 11 rotates in the other direction, as shown in FIG. 5, the engagement surface 113A of the internal teeth 113 of the gear member 11 comes into contact with the tip of one of the claws 131. When one of the claws 131 is pushed in the other direction by the internal teeth 113, the tip of one of the claws 131 of the slide member 13 slides on the engagement surface 113A of the internal teeth 113 and enters into the recess of the engagement surface 113A. Therefore, when the gear member 11 rotates in the other direction, the claw 131 of the slide member 13 gets caught on the internal teeth 113 of the gear member 11, and the gear member 11 rotates integrally with the shaft mounting member 12 via the slide member 13. The shaft mounting member 12 rotates together with the rotating shaft portion 23 of the damper device 20. A rotational resistance is applied to the rotating shaft portion 23. Therefore, a rotational resistance is applied to the shaft mounting member 12 as well, and a rotational resistance is also applied to the gear member 11 which rotates integrally with the shaft mounting member 12.

[0032] As described above, the rotary damper 1 applies rotational resistance when the gear member 11 of the one-way clutch 10 rotates in the other direction, and applies no rotational resistance when it rotates in one direction. By using this rotary damper 1 in a door or the like, the action of the door can be made lighter when it is opened, and heavier when it is closed.

[0033] In order to achieve miniaturization, the rotary damper 1 of this embodiment is configured using a slide member 13. The shaft mounting member 12 that supports this slide member 13 enables the support of the slide member 13 and the mounting of the damper device 20 to the rotating shaft portion 23. In other words, by using a single member that performs two functions, the rotary damper 1 of this embodiment can be miniaturized with a small number of parts.

[0034] Furthermore, in this embodiment, since the shaft mounting member 12 has the cover portion 122, a separate part for closing the opening of the gear member 11 is not required.

[0035] Furthermore, if the slide member 13 is disposed in the through hole 121A of the shaft mounting member 12, the installation of the slide member 13 can be completed by attaching the shaft mounting member 12 to the damper device 20, which facilitates the assembly process of the one-way clutch 10. In addition, since the shaft mounting member 12 has a cover portion 122, it is also possible to prevent the gear member 11 from falling off from above.

[0036] (Modification) Below, a description will be given of modifications different from the shaft mounting member 12 of the above-described embodiment.

[0037] Fig. 6 is a perspective view of a modified shaft mounting member 15. Fig. 7 is a cross-sectional view of a rotary damper 1A equipped with a modified shaft mounting member 15. Fig. 7 corresponds to a cross section taken along the line III-III of Fig. 1, similar to Fig. 3.

[0038] The shaft mounting member 15 has a main body portion 151 and a cover portion 152 .

[0039] The main body 151 is cylindrical and extends along the axis P. The main body 151 has a notch 153 that is cut from the lower end to the vicinity of the center. The notch 153 is formed so that the through hole 121A and the insertion portion 121B of the above-mentioned embodiment communicate with each other, and penetrates the main body 151 in the radial direction. The rotating shaft 23 of the damper device 20 is inserted into the notch 153. The slide member 13 is disposed in the notch 153. The slide member 13 disposed in the notch 153 is supported by the upper end of the rotating shaft 23 that is inserted into the notch 153. That is, the slide member 13 slides on the upper end of the rotating shaft 23 when moving in the radial direction.

[0040] The lid portion 152 is provided at the upper end of the main body portion 151, and when the gear member 11 and the shaft mounting member 15 are attached, it covers the opening at the upper end of the gear member 11 and prevents the gear member 11 from falling out from above.

[0041] In this way, since the slide member 13 can be supported and attached to the rotating shaft portion 23 by a single cutout portion 153, the shaft mounting member 15 can be manufactured easily. [Explanation of symbols]

[0042] 1, 1A: Rotary damper 10: One-way clutch 11: Gear parts 12: Shaft mounting member 13: Slide member 15: Shaft mounting member 20: Damper device 21: Housing 22: Rotor blade 23: Rotating shaft 24: Lid 25: Viscous body 112: External teeth 113: Inner teeth 121A: Through hole 121B: Insertion section 122: Lid

Claims

1. a shaft mounting member that is mounted on a rotating shaft of a damper device to which rotational resistance is applied and rotates together with the rotating shaft about an axis of the rotating shaft; a slide member supported by the shaft mounting member so as to be movable along a radial direction of the shaft, the slide member having a claw portion at an end portion in the radial direction; a gear member having a cylindrical shape extending along the axis, accommodating the axis mounting member and the slide member inside, a plurality of external teeth provided on an outer peripheral surface along a circumferential direction of the axis, and a plurality of internal teeth provided on an inner peripheral surface along the circumferential direction; Equipped with The gear member is When rotating around the shaft, when rotating in one direction, the claw portion of the slide member and the internal teeth mesh with each other, so that the slide member rotates together with the shaft mounting member, and when rotating in the other direction, the internal teeth and the claw portion slide against each other, so that the slide member moves away from the internal teeth, so that the slide member rotates independently of the shaft mounting member. The shaft mounting member is a through hole penetrating in the radial direction and in which the slide member is disposed; an insertion portion provided at one end in an axial direction along the shaft, into which the rotating shaft portion is inserted along the axial direction; having One-way clutch.

2. The shaft mounting member has a cover portion at the other end in the axial direction for closing the opening of the gear member. The one-way clutch according to claim 1.

3. The through hole and the insertion portion are formed to communicate with each other, The slide member is supported by an end of the rotation shaft portion that is inserted into the insertion portion. The one-way clutch according to claim 1 or 2.

4. A rotary damper comprising the one-way clutch according to claim 1 and the damper device, The damper device is a housing supporting the rotating shaft portion so as to be rotatable about the axis; a rotor blade that rotates together with the rotary shaft portion within the housing; a viscous body that is accommodated in the housing and applies rotational resistance to the rotating rotor blades; The rotary damper has

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