JP5568980B2 - Roller clutch - Google Patents

Description

  The present invention relates to a shell type roller clutch that transmits power in only one direction.

  As a conventional roller clutch of this type, a roller clutch shown in FIG. 3 is known. The roller clutch includes a plurality of rollers 30, a cage 32 having the same number of roller pockets 31 as the rollers 30, a cylindrical shell 34 having the same number of cam grooves 33 as the rollers 30, and the rollers 30 as cam grooves 33. And a spring (not shown) that urges toward the head.

  This roller clutch is provided with an incomplete shell 34 in which a radially inward flange 34A is formed by bending one open end of a cylindrical body inward in the radial direction. 30. After incorporating the spring and cage 32, the open end of the shell 34 is completed by caulking inward in the radial direction, so that the cage 32 and the roller 30 are not dropped from the shell 34. Yes.

  However, since this roller clutch finally crimps the open end of the shell 34 radially inward, there is a possibility that plating such as rust prevention plating provided on the shell 34 may be peeled off by crimping.

  In order to prevent the shell from being peeled off, Patent Document 1 adopts the structure shown in FIGS. More specifically, the shell 1 is formed of a cylindrical body having a flange 11 bent radially inward on one side in the axial direction and having the other side in the axial direction opened straight in the axial direction. Are provided with the same number of cam grooves 12 as the rollers 3.

  The open end of the shell 1 is provided with a circular cylindrical boss portion 13 in which the cam groove 12 having an inner diameter substantially equal to the circumscribed circle diameter of each cam groove 12 is not formed.

  The cage 2 is formed of a synthetic resin, and a pair of annular portions 21 and 22 provided opposite to each other at both axial ends of the cage 2, and the annular portions 21 and 22 are circumferentially arranged. It is comprised with the some pillar part 23 connected by the direction equal intervals. A space between the adjacent column portions 23 becomes a roller pocket 24 for storing the roller.

  The front wall of the pillar part 23 is integrally provided with a spring 25 made up of a planar substantially C-shaped bifurcated elastic piece that expands and extends toward the rear wall side of the opposite pillar part 23, and Receiving portions 26, 26 are provided on both sides of the base of the spring 25. The receiving portions 26 and 26 are disposed on the back side of the free end of the spring 25, and limit the amount of bending when the spring 25 is bent backward.

  Furthermore, three protrusions 27 are formed on the outer periphery of the annular portion 21 on the front end side of the cage 2 in the assembling direction, and the outer diameter dimension of the annular portion 22 on the rear end side in the assembling direction is as follows. , It is set larger than the circumscribed circle of the column part 23. The protrusion 27 has a substantially semicircular cross section, and engages every other cam groove 12 of the shell 1, and the annular portion 22 on the rear end side in the assembling direction is formed on the cylindrical boss portion 13 of the shell 1. It is designed to be press fit.

  Then, when the roller clutch configured as described above is attached to the outer peripheral portion of the rotating shaft 4 and the rotating shaft 4 is rotated in the direction of the white arrow in FIG. Since the roller 3 is rolled to the gentle slope and is wedged between the cam groove 12 and the rotating shaft 4, the roller 3 cannot rotate and the rotating shaft 4 and the shell 1 rotate integrally. . On the other hand, when the rotating shaft 4 is rotated in the reverse direction, that is, in the direction of the black arrow in FIG. 5, the roller 3 is rolled to the steep slope side of the cam groove 12 while deflecting the spring 25 backward. Is free to rotate between the cam groove 12 and the rotating shaft 4, so that only the rotating shaft 4 rotates without the shell 1 rotating.

No. 7-29316

  However, since the roller clutch described in Patent Document 1 does not perform caulking processing on the shell, there is no problem that rust prevention plating or the like is peeled off by caulking processing, but because the cage is pressed into the shell and fixed. When the operating temperature is low or depending on the magnitude of vibration, the cage and the roller may come out.

  Therefore, an object of the present invention is to provide a roller clutch that can prevent the cage from coming out regardless of the operating temperature and the magnitude of vibration while preventing the possibility that the plating applied to the shell is peeled off.

The above object is achieved by the following configuration.
(1) A plurality of rollers, a cage having the same number of roller pockets as the rollers, a cylindrical shell having the same number of cam grooves as the rollers on the inner peripheral surface, and attaching the rollers toward the cam grooves. A roller clutch that transmits power only in one direction,
The shell is provided with the cam groove at an axially intermediate portion, a radially inward flange is provided on one axial side of the cam groove, and the cam groove is provided on the other axial side of the cam groove. An unformed cylindrical boss is provided,
An annular groove is formed on the cylindrical boss,
The groove portion is fitted with a retaining portion for retaining the retainer,
The retaining portion is composed of a substantially C-shaped retaining ring in which a part in the circumferential direction is cut off ,
A roller clutch characterized in that a predetermined gap is provided in the radial direction and the axial direction between the groove portion and the retaining portion .

  According to the present invention, since the retaining structure is constituted by the annular groove formed in the cylindrical boss portion of the shell and the retaining portion fitted into the groove, plating such as rust prevention plating applied to the shell is performed. The cage can be prevented from coming out without being peeled off and irrespective of the operating temperature and the magnitude of vibration.

It is sectional drawing of the roller clutch of 1st Embodiment which concerns on this invention. It is sectional drawing of the roller clutch of 2nd Embodiment which concerns on this invention. It is sectional drawing of the conventional roller clutch. 2 is a cross-sectional view of a roller clutch described in Patent Document 1. FIG. It is the VV sectional view taken on the line of FIG. It is a perspective view which shows a part of holder | retainer of FIG.

  Hereinafter, each embodiment of the roller clutch of the present invention will be described in detail with reference to the drawings. Since the basic structure of the roller clutch of the present invention is the same as that of the conventional roller clutch shown in FIGS. 4 to 6 except for the retaining structure of the cage with respect to the shell, the same or equivalent parts will be described. The retaining structure of the cage with respect to the shell will be described in detail, which is simplified or omitted.

<First Embodiment>
FIG. 1 is a cross-sectional view of a roller clutch according to a first embodiment of the present invention.
The roller clutch 40 of the present embodiment includes a plurality of rollers 43, a retainer 42 having the same number of roller pockets 44 as the rollers 43, a cylindrical shell 41 having the same number of cam grooves 41 a as the rollers 43, and the rollers 43. And a spring (not shown) that urges toward the cam groove 41a (corresponding to the spring 25 in FIGS. 4 to 6).

  The shell 41 is provided with a cam groove 41a at an axially intermediate portion, a radially inward flange 41b is provided on one axial side of the cam groove 41a, and a cam groove 41a on the other axial side of the cam groove 41a. A cylindrical boss portion 41c is formed in which no rust is formed, and rust-proof plating is applied to the whole.

  The cage 42 includes a pair of annular portions 421 and 422 provided opposite to each other at both ends in the axial direction, and a plurality of pillar portions (not shown) that connect the annular portions 421 and 422 at equal intervals in the circumferential direction. (Corresponding to the pillar portion 23 in FIGS. 5 and 6). The space between the adjacent column portions becomes a roller pocket 44 for storing the roller, and the roller 43 that is engaged with the cam groove 41a is biased by the spring 25 toward the cam groove 41a.

  The annular portion 421 on the flange 41b side of the cage 42 is formed with projections (corresponding to the projections 27 in FIGS. 5 and 6) at equal intervals in the circumferential direction, and the circumferential rotation of the cage 42 with respect to the shell 41. Is regulated. Further, the annular portion 422 opposite to the flange 41b is fitted with a clearance with respect to the cylindrical boss portion 41c, and the retainer 42 is configured to be movable in the axial direction.

  Therefore, an annular groove 55 is formed on the inner peripheral surface of the shell 41 at a position on the cylindrical boss 41c facing the outside in the axial direction of the annular portion 422 of the retainer 42, and the groove 55 has a substantially C shape. The retaining ring 56 is loosely fitted (fitted). The retaining ring 56 is provided with a circumferential notch in which the roller 43 does not fall off, and has a substantially C shape.

  A predetermined gap S1 is provided between the retaining ring 56 and the outer end surface of the annular portion 422, and wear of the retainer 42 and the retaining ring 56 is suppressed. In addition, predetermined gaps S2 and S3 are provided in the axial direction and the radial direction between the concave groove 55 and the retaining ring 56 that is loosely fitted in the concave groove 55, respectively. Thereby, even if the retainer 42 and the retaining ring 56 collide, the deformation of the retaining ring 56 is suppressed.

According to the roller clutch 40 of the present embodiment described above, the shell 41 is provided with the cam groove 41a at the intermediate portion in the axial direction, and the radially inward flange 41b is provided at one axial side of the cam groove 41a. And a cylindrical boss portion 41c in which the cam groove 12 is not formed is provided on the other axial side of the cam groove 41a. The cylindrical boss portion 41c is provided with a concave groove 55 as an annular groove portion. A retaining ring 56 as a retaining portion for retaining the retainer 42 is loosely fitted. Accordingly, since the caulking process is not performed on the shell 41, the rust preventing plating or the like is not peeled off by the caulking process. Further, the movement of the cage 42 in the axial direction is restricted by an annular groove 55 formed in the cylindrical boss portion 41 c of the shell 41 and a retaining ring 56 that is loosely fitted in the groove 55. The cage 42 and the roller 43 can be reliably prevented from coming out even when the resistance is low or the vibration is large.
Moreover, since the retaining structure is constituted by the annular concave groove 55 formed in the cylindrical boss portion 41c and the retaining ring 56, the retaining structure can be realized with a simple configuration.

Second Embodiment
FIG. 2 is a cross-sectional view of a roller clutch according to a second embodiment of the present invention.
The roller clutch 40A of the second embodiment is different from the retaining structure of the first embodiment in that the retaining structure is formed by an annular concave groove 55 formed in the cylindrical boss portion 41c and the retainer 42. In addition, the same or equivalent part as 1st Embodiment is attached | subjected to the same or equivalent code | symbol, and the description is abbreviate | omitted.

  In the present embodiment, an annular concave groove 55 is formed on the inner peripheral surface of the shell 41 at a position on the cylindrical boss portion 41 c facing the annular portion 422 of the cage 42, and the flange 41 b of the cage 42. On the outer peripheral surface of the annular portion 422 on the opposite side, a projecting portion 57 projecting in the radial direction and having a substantially semicircular cross section is provided, and the projecting portion 57 is loosely fitted (fitted) into the concave groove 55. The protrusion 57 may be an annular protrusion continuous in the circumferential direction, or may be composed of a plurality of protrusions formed in the circumferential direction.

  Predetermined gaps S <b> 2 and S <b> 3 are provided in the axial direction and the radial direction between the concave groove 55 and the protrusion 57 that is loosely fitted in the concave groove 55. Thereby, even if the roller 43 collides with the retainer 42, an excessive load is suppressed from being applied to the retainer 42.

According to the roller clutch 40A of the present embodiment described above, similarly to the first embodiment, the shell 41 is not subjected to caulking, and thus plating such as rust preventive plating is not peeled off by caulking. Further, the movement of the cage 42 in the axial direction is restricted by the annular groove 55 formed in the cylindrical boss 41 c of the shell 41 and the protrusion 57 of the cage 42 loosely fitted in the groove 55. Even when the operating temperature is low or the vibration is large, the retainer 42 and the roller 43 can be reliably prevented from coming out.
Further, since this retaining structure is constituted by the annular concave groove 55 formed in the cylindrical boss portion 41c and the protrusion 57 formed on the outer peripheral surface of the annular portion 422 of the retainer 42, a new member is provided. A retaining structure can be realized with a small number of parts.

In the roller clutch of each of the above-described embodiments, the configuration of the roller, the cage, the shell, the spring, and the like is not limited to those illustrated in the above-described embodiments of the respective embodiments, and does not depart from the gist of the present invention. The range can be changed as appropriate.
Further, in each of the above embodiments, the predetermined gaps S2 and S3 are provided in the axial direction and the radial direction between the concave groove 55 and the retaining ring 56 or the protruding portion 57 so as to loosely fit into the concave groove 55. It is not always necessary to provide one, and only one of them may be provided.

40, 40A Roller clutch 41 Shell 41a Cam groove 41b Flange 41c Cylindrical boss part 42 Cage 421, 422 Annular part 43 Roller 44 Roller pocket 55 Concave groove (groove part)
56 Retaining ring (Retaining part)
57 Projection (Retaining part)
S2 Axial clearance
S3 radial clearance

Claims (1)

A plurality of rollers, a cage having the same number of roller pockets as the rollers, a cylindrical shell having the same number of cam grooves as the rollers on the inner peripheral surface, and a spring for biasing the rollers toward the cam grooves And a roller clutch that transmits power only in one direction,
The shell is provided with the cam groove at an axially intermediate portion, a radially inward flange is provided on one axial side of the cam groove, and the cam groove is provided on the other axial side of the cam groove. An unformed cylindrical boss is provided,
An annular groove is formed on the cylindrical boss,
The groove portion is fitted with a retaining portion for retaining the retainer,
The retaining portion is composed of a substantially C-shaped retaining ring in which a part in the circumferential direction is cut off ,
A roller clutch characterized in that a predetermined gap is provided in the radial direction and the axial direction between the groove portion and the retaining portion .

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