JP2012082899A - Torque transmission mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torque transmission mechanism having small parts count, without requiring high-accuracy, reduced in costs, and hardly generating adhesion even when foreign matter enters therein.SOLUTION: The torque transmission mechanism 1 includes a first member 10 having a cylindrical outer circumferential surface 11 and a second member 20 having a cylindrical inner circumferential surface 21 in contact with the outer circumferential surface 11. The outer circumferential surface 11 is provided with a bristling tilted pile 12 tilted in a circumferential direction A. The inner circumferential surface 21 is provided with a meshing part 22. When the outer circumferential surface 11 is rotated in the direction A relative to the inner circumferential surface 21, the tilted pile 12 is meshed with the meshing part 22 so that different torque is transmitted in accordance with the forward/reverse in the rotating direction and a magnitude of rotary torque.

Description

  The present invention relates to a rotational force transmission mechanism, and more particularly to a rotational force transmission mechanism in which the torque transmitted varies depending on the forward / reverse direction of rotation and the magnitude of rotational torque.

  Rotational force transmission mechanisms, such as one-way clutches and torque limiters, that have different torques depending on the direction of rotation and the magnitude of rotational torque, are used in various machines such as bicycles, automobiles, and OA machines. Has been.

  As such a rotational force transmission mechanism, a one-way clutch using a ratchet is known (Patent Document 1). A one-way clutch using a ratchet has a problem that it has a high number of parts, and high accuracy is required for individual parts and assembly, resulting in high cost and weakness against vibration. Further, there is a problem that when a foreign object enters, the outer ring and the inner ring are fixed, and the operation is not normally performed.

  On the other hand, as a torque limiter, those using a coil spring (Patent Document 2) and those using a magnetic force (Patent Document 3) are known. Those using coil springs are expensive because they require high precision in the individual parts and assembly, especially the positional relationship between the shaft centers, and when foreign matter enters, the outer ring and inner ring are fixed and There was a problem of not working. Moreover, since the thing using magnetic force has many components and high precision is calculated | required for a component single item and an assembly, there existed a problem that it became high cost.

JP 2008-244104 A JP 2010-032022 A JP 2005-282794 A

  Therefore, the problem to be solved by the present invention is to provide a rotational force transmission mechanism that has a small number of parts, does not require high accuracy, is low-cost, and does not easily stick even if foreign matter enters. is there.

  The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 includes a first member having a cylindrical outer peripheral surface and a cylindrical inner peripheral surface in contact with the outer peripheral surface. An inclined pile that is raised in a slanted manner in any one of the circumferential directions is provided on either one of the outer peripheral surface and the inner peripheral surface; A meshing portion is provided on the circumferential surface of the first circumferential surface, and when the one circumferential surface rotates in the one direction relative to the other circumferential surface, the inclined pile meshes with the meshing portion. This is a rotational force transmission mechanism.

  According to the first aspect of the present invention, since the meshing of the inclined piles is used, the number of parts is small, high accuracy is not required, and the cost is low. A rotational force transmission mechanism can be provided.

  The invention according to claim 2 is the rotational force transmission mechanism according to claim 1, wherein the meshing portion is formed of unevenness formed on the other peripheral surface.

  According to the second aspect of the present invention, since the engagement portion can be provided by forming the irregularities, the rotational force transmission mechanism according to the first aspect can be provided with a simple configuration.

  The invention according to claim 3 is the rotational force transmission mechanism according to claim 1, wherein the meshing portion is formed of a protrusion or a groove provided on the other peripheral surface and extending in the axial direction. .

  According to the third aspect of the present invention, since the meshing portion can be provided by forming the axially extending ridge or groove on the peripheral surface, the rotational force transmission mechanism according to the first aspect can be provided with a simple configuration. Can be provided.

  The invention according to claim 4 is characterized in that the meshing portion is formed of a sawtooth standing on the other peripheral surface and inclined in the direction opposite to the one direction. It is.

  According to the fourth aspect of the present invention, it is possible to provide the rotational force transmission mechanism according to the first aspect of the present invention that realizes close meshing and a large limit torque to be transmitted.

  The invention according to claim 5 is the rotational force transmission mechanism according to claim 1, wherein the meshing portion is formed of an inclined pile that is raised from the other peripheral surface and is inclined in a direction opposite to the one direction. It is.

  According to the fifth aspect of the present invention, it is possible to provide the rotational force transmission mechanism according to the first aspect of the present invention that achieves close meshing with a simple configuration and has a large limit torque to be transmitted.

  The invention according to claim 6 is a one-way clutch using the rotational force transmission mechanism according to any one of claims 1 to 5.

  According to the sixth aspect of the present invention, since the meshing of the inclined piles is used, the number of parts is small, high accuracy is not required, and the cost is low. A one-way clutch can be provided.

  A seventh aspect of the present invention is a torque limiter using the rotational force transmission mechanism according to any one of the first to fifth aspects.

  According to the seventh aspect of the invention, since the meshing of the inclined piles is used, the number of parts is small, high accuracy is not required, and the cost is low. A torque limiter can be provided.

  According to the present invention, since the meshing of the inclined piles is used, the number of parts is small, high accuracy is not required, and the cost is low. Can be provided.

It is a perspective view which shows the rotational force transmission mechanism which concerns on 1st embodiment of this invention. It is a disassembled perspective view which shows the rotational force transmission mechanism which concerns on 1st embodiment of this invention. It is sectional drawing which shows the Example of the rotational force transmission mechanism which concerns on 1st embodiment of this invention. It is sectional drawing which shows the rotational force transmission mechanism which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the rotational force transmission mechanism which concerns on 3rd embodiment of this invention. It is sectional drawing which shows the rotational force transmission mechanism which concerns on 4th embodiment of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are preferred embodiments of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

  The rotational force transmission mechanism according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a rotational force transmission mechanism according to the first embodiment, and FIG. 2 is an exploded perspective view. FIG. 3 is a sectional view showing an example of the rotational force transmission mechanism according to the first embodiment.

  The rotational force transmission mechanism 1 shown by the code | symbol 1 makes the main component the 1st member 10 comprised by the column shape, and the 2nd member 20 comprised cyclically | annularly. The first member 10 is housed inside the second member 20, and the cylindrical outer peripheral surface 11 of the first member 10 is in contact with the cylindrical inner peripheral surface 21 of the second member 20.

  The outer peripheral surface 11 of the first member 10 is provided with an inclined pile 12 that is inclined toward the direction A illustrated by the symbol A in the circumferential direction. As an example of the meshing portion 22 that meshes with the inclined pile 12, the inner peripheral surface 21 of the second member 20 has concave grooves 22a, ..., 22a extending in the axial direction in Figs. Are provided apart from each other in the circumferential direction. In addition, although the concave groove 22a illustrated in FIGS. 1, 2, and 3 (a) is formed in a V-shape, the cross-sectional shape is not particularly limited, and a U-shaped groove or the like is also applicable. Further, as shown in FIG. 3B, a plurality of protrusions 22 b,..., 22 b extending in the axial direction can be provided apart from each other in the circumferential direction, and can be configured as a meshing portion 22 that meshes with the inclined pile 12. is there. Moreover, the triangular tooth 22c provided continuously as shown in FIG.3 (c), and the sawtooth 22d as shown in FIG.3 (d) are applicable.

  In addition, although the illustrated first member 10 is configured such that the inclined pile 12 is directly provided on the outer peripheral surface 11, the inclined member piled up from the base fabric is attached to the cylindrical surface, thereby attaching the inclined member 12 to the outer peripheral surface 11. Of course, it is also possible to provide the inclined pile 12 indirectly.

  Next, operation | movement of the rotational force transmission mechanism 1 which concerns on this embodiment is demonstrated using Fig.3 (a), (e). When the first member 10 rotates in the direction opposite to the direction A relative to the second member 20, the inclined pile 12 rotates smoothly without being obstructed by the concave groove 22a. That is, in this rotational direction, no rotational force is transmitted between the first member 10 and the second member 20.

  When the first member 10 rotates relative to the second member 20 in the direction A, the hair ends of some of the inclined piles 12 mesh with the concave grooves 22a, so that the hairs of the inclined piles 12 are compressed in the length direction. Forces to act. Thereby, the rotational force of the first member 10 is transmitted to the second member 20.

  Here, when the applied rotational force exceeds a predetermined torque, the hair is buckled by the compressive force acting on the inclined pile 12, so that the inclined pile 12 is warped in the reverse direction and the meshing with the concave groove 22a is released. (See FIG. 3E). That is, when the predetermined torque is exceeded, the rotational force of the first member 10 is not transmitted to the second member 20, which means that the predetermined torque is a limit torque to be transmitted.

  The limit torque to be transmitted is determined by the load with which the hair of the inclined pile 12 buckles. Therefore, the limit torque to be transmitted can be set by appropriately changing the hair density, hair length, hair stiffness, etc. of the inclined pile 12.

  The limit torque to be transmitted also varies depending on the shape of the meshing portion 22. For example, when the meshing portion 22 is constituted by the concave grooves 22a, the greater the number of the concave grooves 22a, the more portions that mesh with each other, so the limit torque to be transmitted increases. Furthermore, when the continuously provided triangular teeth 22c as shown in FIG. 3C are used as the meshing portion 22, a large number of bristles of the inclined pile mesh with each other, so that the limit torque to be transmitted increases. Furthermore, as shown in FIG. 3 (d), when the toothed portion 22d inclined in the direction opposite to the direction A is used as the engaging portion 22, the hair of the inclined pile 12 warps more greatly in order to release the engagement. Since it must be returned, the limit torque transmitted is even greater.

  Note that the shapes of the meshing portions 22 listed above are all shapes that extend continuously in the axial direction with a constant cross section, but are not continuous in the axial direction, for example, are recessed in the inner peripheral surface discretely. Since the depressions, knurls, and irregularities on the surface of the fabric mesh with the inclined pile 12, they can be suitably used as the meshing portion.

  The rotational force transmission mechanism 1 can be configured with a small number of parts and without requiring precise assembly. That is, since the rotational force is transmitted through the inclined pile, even if a foreign object enters between the first member 10 and the second member 20, it does not easily stick and rotates in a predetermined direction. Only the function of transmitting torque is not easily impaired. Furthermore, since the rotational force is transmitted via the inclined pile, the axis of the first member 10 and the axis of the second member 20 are shaken, or the axis of the first member 10 and the second member 20 are Even when the shaft center is inclined, the rotational force is transmitted as long as the inclined pile 12 and the engagement portion 22 are engaged with each other. That is, high precision coaxiality and inclination are not required at the time of assembly, and shake, inclination, and vibration are allowed even during use.

  The one-way clutch can be suitably configured by utilizing the property of the torque transmission mechanism 1 that torque is transmitted when rotating in one direction and torque is not transmitted when rotating in the opposite direction. it can. In addition, a torque limiter can be suitably configured by utilizing the property of the rotational force transmission mechanism 1 that transmits a predetermined torque in one direction but does not transmit the torque when the predetermined torque is exceeded. It is of course possible to configure as a one-way clutch combined torque limiter.

(Second embodiment)
Next, the rotational force transmission mechanism 2 according to the second embodiment of the present invention will be described with reference to FIG. The second embodiment is also a mechanism in which the rotational force is transmitted by meshing the inclined pile and the meshing portion. However, the second embodiment is different from the first embodiment in that the meshing portion 22 of the second member 20 is an inclined pile. 23.

  In the rotational force transmission mechanism 2 according to the second embodiment, the rotational force is transmitted by meshing the inclined pile 12 and the meshing portion 22 as in the first embodiment. However, in the rotational force transmission mechanism 2 according to the second embodiment, since the meshing portion 22 is constituted by the inclined pile 23, the rotational force transmitting mechanism 2 is strong against the intrusion of foreign matter and has a high tolerance for the shift and inclination of the shaft center. Moreover, since the same kind of inclined pile can be used by the inclined pile 12 and the inclined pile 23 which comprises the meshing part 22, a rotational force transmission mechanism can be comprised with few kinds of components.

(Third embodiment)
Next, a rotational force transmission mechanism 3 according to a third embodiment of the present invention will be described with reference to FIG. The third embodiment is also a mechanism in which the rotational force is transmitted when the inclined pile and the meshing portion mesh with each other. However, the difference from the first embodiment is that the inclined pile is provided on the inner peripheral surface 21 of the second member 20. 23, and the meshing portion 13 is formed on the outer peripheral surface 11 of the first member 10. FIG. 5A shows a configuration having a meshing portion 13 composed of a plurality of V-shaped concave grooves 13a,..., 13a extending in the axial direction and spaced apart in the circumferential direction. b) is the structure which has the meshing | engagement part 13 comprised from the protrusion 13b, ... 13b provided in multiple numbers spaced apart in the circumferential direction extended in an axial direction. As in the first embodiment, irregularities that are not continuous in the axial direction, such as depressions that are discretely provided on the inner peripheral surface, knurls, irregularities on the fabric surface, and the like are also used as the meshing portion 13. be able to.

  Similarly to the first embodiment, the rotational force transmission mechanism 3 according to the third embodiment can be configured with a small number of parts because the rotational force is transmitted by the meshing of the inclined pile 23 and the meshing portion 13, and the foreign matter can be reduced. It is strong against intrusion and has a high tolerance for shaft misalignment and inclination.

(Fourth embodiment)
Next, a rotational force transmission mechanism according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view showing the rotational force transmission mechanism.

  The rotational force transmission mechanism 4 shown by the code | symbol 4 makes the main component the 1st member 30 comprised by the column shape, and the 2nd member 40 comprised by the endless belt shape and which has a softness | flexibility. The second member 40 is wound around the outer periphery of the first member 30, and a portion of the inner surface 40 a of the second member 40 that contacts the cylindrical outer peripheral surface 31 of the first member 30 is curved and cylindrical. An inner peripheral surface 41 is formed.

  On the inner surface 40a of the second member 40, there is provided an inclined pile 42 that is inclined toward the direction A indicated by the symbol A and is raised. On the outer peripheral surface 31 of the first member 30, a plurality of concave grooves 32 a,..., 32 a extending in the axial direction are provided apart from each other in the circumferential direction as meshing portions 32 that mesh with the inclined piles 42. Note that the engagement portion 32 is not limited to the V-shaped groove, but can be applied to a U-shaped groove, and is not limited to the groove, as in the first to third embodiments. Triangular teeth, saw teeth, etc. can also be used.

  Although the illustrated second member 40 is configured such that the inclined pile 42 is directly provided from the inner surface 40a thereof, the second member 40 can be planted on the inner surface 40a of the second member 40, or the base fabric. Of course, it is also possible to construct an inclined pile formed by raising the belt as it is as a belt.

  Next, the operation of the rotational force transmission mechanism 4 according to this embodiment will be described. When the rotational force transmission mechanism 4 shown in FIG. 6 is considered to be a form in which the belt rotationally drives the shaft body, when the second member 40 rotates in the direction A, the rotational force is transmitted to the first member 30. When the second member 40 rotates in the direction opposite to the direction A, the rotation force is not transmitted to the first member 30. On the other hand, when it is considered that the shaft body drives the belt, when the first member 30 rotates in the direction opposite to the direction A, the rotational force is transmitted to the second member 40 and the first member 30 in the direction A When the member 30 rotates, the mechanism is configured such that the rotational force is not transmitted to the second member 40.

  The rotational force transmission mechanism 1 according to the present embodiment can be suitably applied to a one-way clutch and a torque limiter in a drive system via a belt. Moreover, it can apply suitably also to the bell trench which gives a torque to a shaft body.

DESCRIPTION OF SYMBOLS 1 Rotational force transmission mechanism 2 Rotational force transmission mechanism 3 Rotational force transmission mechanism 4 Rotational force transmission mechanism 10 1st member 11 Outer peripheral surface 12 Inclined pile 13 Engagement part 20 Second member 21 Inner peripheral surface 22 Engagement part 22a Groove 22b Projection 22d sawtooth 23 inclined pile

Claims (7)

A first member having a cylindrical outer peripheral surface;
A second member having a cylindrical inner peripheral surface that contacts the outer peripheral surface,
Either one of the outer peripheral surface and the inner peripheral surface is provided with an inclined pile that is inclined in any one of the circumferential directions, and the other peripheral surface has a meshing portion. Provided,
When the one peripheral surface rotates in the one direction relative to the other peripheral surface, the inclined pile meshes with the meshing portion. The rotational force transmission mechanism according to claim 1, wherein the meshing portion is formed by unevenness formed on the other peripheral surface. The rotational force transmission mechanism according to claim 1, wherein the meshing portion includes a protrusion or a groove provided on the other peripheral surface and extending in the axial direction. The rotational force transmission mechanism according to claim 1, wherein the meshing portion is formed of a sawtooth that is erected on the other peripheral surface and is inclined in a direction opposite to the one direction. The rotational force transmission mechanism according to claim 1, wherein the meshing portion includes an inclined pile that is raised from the other peripheral surface and is inclined in a direction opposite to the one direction. A one-way clutch using the rotational force transmission mechanism according to any one of claims 1 to 5. A torque limiter using the rotational force transmission mechanism according to any one of claims 1 to 5.

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