JP2008128319A - One-way clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-way clutch excelling in assembling property and enabling each engaging element to be engaged with a cam face with simple constitution. <P>SOLUTION: The engaging element 3 is formed in columnar shape extending in the axial direction of the clutch, and both ends of each engaging element 3 of columnar shape are provided with grooves 3a penetrating in the circumferential direction of the clutch. Garter springs 4 penetrate the grooves 3a, and each engaging element 3 is pressed to the outer peripheral surface of a rotating shaft 1 serving as an inner member, by the garter springs 4 to prevent the scatter of each engaging element by the garter springs 4 penetrating the grooves 3a at both ends of each engaging element 3. Assembling property is thereby improved, and each engaging element 3 can be engaged with the cam face 2a of an outer member 2 with simple constitution. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a one-way clutch.

  The conventional one-way clutch that locks the relative rotation of the inner member and the outer member in one direction is provided with a plurality of inclined cam surfaces on either the inner peripheral surface of the outer member or the outer peripheral surface of the inner member. Roller and sprag engagement elements are arranged at respective circumferential positions where these cam surfaces are provided, and these engagement elements are pressed in the direction of engagement with the cam surfaces by an elastic member such as a spring.

  In such a one-way clutch, a circumferential interval is provided between the engagement elements, and the engagement elements are individually held by the retainer or the holding portion of the outer member, and are individually held on the cam surface by individual elastic members. In many cases, they are pressed in the engaging direction (see, for example, Patent Document 1). In some cases, the rollers are arranged in contact with each other in the state of full rollers as engaging elements, and these rollers are pressed in a direction to be engaged with the cam surface by a common elastic member (for example, Patent Document 2). In the one described in Patent Document 2, one end of a C-shaped spring as a common elastic member is locked to an outer member or an inner member, and a cylindrical portion of one roller is pressed by a hook portion provided at the other end. Like to do.

  Further, in these one-way clutches, when the roller is an engagement element, the roller pressed by the elastic member is rolled and moved in a direction to engage the cam surface, and the sprag is an engagement element. The sprag pressed by the elastic member is rotated so as to stand up from the lying posture, and is engaged with the cam surface.

Japanese Utility Model Publication No. 60-150336 JP 2003-56601 A

  The one-way clutch described in Patent Document 1 has a problem in that the configuration is complicated because each of the engagement elements is individually held and pressed in the direction of engagement with the cam surface by an individual elastic member. . Moreover, although the one-way clutch described in Patent Document 2 can engage each roller as an engaging member with the cam surface with a simple configuration, the roller cannot be held in the concave portion of the cage or the outer member. There is a problem that each roller is scattered easily and the assemblability is poor.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a one-way clutch that is easy to assemble and can engage each engagement element with a cam surface with a simple configuration.

  In order to solve the above-described problems, the present invention provides a plurality of inclined cam surfaces on the inner peripheral surface of the outer member facing the outer peripheral surface of the inner member, and each circumferential position where these cam surfaces are provided. An engaging element is disposed between the inner member and the outer member, and each of the engaging elements is engaged with the cam surface to lock the relative rotation in one direction of the inner member and the outer member. In the one-way clutch, the engagement element is formed in a columnar shape extending in the axial direction of the clutch, and grooves that penetrate in the circumferential direction of the clutch are provided at both ends of each of the columnar engagement elements. When each of the engagement members is pressed against the outer peripheral surface of the inner member by the annular elastic member and the outer member and the inner member are relatively rotated in one direction, the engagement members are passed through the elastic member. The structure which engages with the said cam surface was employ | adopted.

  That is, the ring-shaped elastic members that pass through the grooves at both ends of each columnar engagement element prevent scattering of the engagement elements and improve the assembling property. Each of the engaging elements can be engaged with the cam surface with a simple configuration in which the outer peripheral surface is pressed. In this one-way clutch, each of the engaging members passed through the annular elastic members in the grooves at both ends does not roll or rotate, and moves relative to the outer member in the same posture. Engage with the cam surface. Moreover, since each engaging element is restrained at both ends by the annular elastic member, there is no risk of skew.

  A garter spring can be used as the annular elastic member.

  By making each of the columnar engaging elements cylindrical, the engaging elements can be easily processed.

  By bringing a part or all of the columnar engaging elements into contact with each other in the circumferential direction of the clutch, it is possible to reduce or eliminate the holding parts of the engaging elements and to make a simpler configuration.

  By providing the outer member with a radial receiving portion that receives a radial load between the outer member and the inner member, a separate radial bearing portion can be eliminated.

  The radial receiving portion may be formed integrally with the outer member.

  By providing a cage for holding the engagement elements between the inner member and the outer member, and providing a radial receiving portion for receiving a radial load in the cage, a separate radial bearing portion is not required. Can do.

  In the one-way clutch of the present invention, since the scattering of the engaging elements is prevented by the annular elastic members that are passed through the grooves at both ends of the columnar engaging elements, the assembling property can be improved and the common annular clutch is provided. Each engagement element can be engaged with the cam surface with a simple configuration in which each engagement element is pressed against the outer peripheral surface of the inner member by the elastic member.

  By making each of the columnar engaging elements cylindrical, the engaging elements can be easily processed.

  By bringing a part or all of the columnar engaging elements into contact with each other in the circumferential direction of the clutch, the holding parts of the engaging elements can be reduced or eliminated, and a simpler configuration can be achieved.

  By providing the outer member with a radial receiving portion that receives a radial load with the inner member, a separate radial bearing portion can be made unnecessary.

  By providing a cage for holding each engagement element between the inner member and the outer member, and providing a radial receiving portion for receiving a radial load on the cage, a separate radial bearing portion may be unnecessary. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1A and 1B show a first embodiment. In this one-way clutch, a plurality of inclined cam surfaces 2a are provided on the inner peripheral surface of the outer member 2 facing the outer peripheral surface of the rotating shaft 1 as an inner member, and each of the circumferences on which these cam surfaces 2a are provided Cylindrical engaging elements 3 are arranged between the rotating shaft 1 and the outer member 2 in the directional position, and grooves 3a penetrating in the circumferential direction provided at both ends of each engaging element 3 are used as annular elastic members. The garter spring 4 is passed, and each engagement element 3 is pressed against the outer peripheral surface of the rotating shaft 1.

  On the inner peripheral surface of the outer member 2, radial receiving portions 2b for receiving a radial load with the rotary shaft 1 are integrally formed at three locations in the circumferential direction, and these radial receiving portions 2b are divided into three. In the partitioned clutch space, two sets of three engaging elements 3 and two sets of two engaging elements 3 each having a cylindrical surface abutting each other are housed. Each engagement element 3 is restrained from moving in the axial direction by a garter spring 4 passed through both outer sides of each radial receiving portion 2b.

  As shown by the arrows in FIG. 1A, when the rotary shaft 1 rotates counterclockwise, each engagement element 3 is placed on the cam surface 2a of the outer member 2 together with the rotary shaft 1 in the same posture. It moves in the engaging direction and locks the rotating shaft 1 to the outer member 2. Further, when the rotating shaft 1 rotates clockwise, each engagement element 3 moves in a direction to detach from the cam surface 2a, and the locking of the rotating shaft 1 is released.

  FIG. 2 shows a modification of the engagement element 3. The engagement element 3 of this modification has a streamlined cross section facing the side that engages with the cam surface 2a, and the streamline tip is in contact with the back surface of the front engagement element 3, so that the streamline top The cam surface 2a is engaged with the slope.

  FIGS. 3A and 3B show a second embodiment. The one-way clutch is provided with a cage 5 that holds the engaging elements 3 in the axial direction by the annular portions 5 a on both sides. A radial load is applied to the cage 5 between the rotary shaft 1 and the outer member 2. The radial receiving part 5b to receive is provided in three places of the circumferential direction. The cage 5 is a ridge 5c provided on the outer diameter surface of the radial receiving portion 5b, and is locked to a concave groove 2c provided on the inner diameter surface of the outer member 2 and is prevented from rotating. The other parts are the same as those of the first embodiment, and in the clutch space divided into three by the radial receiving portion 5b, two sets of three engaging elements each having a pillar surface in contact with each other are provided. 3 and a set of two engaging elements 3 are accommodated.

  4 (a) and 4 (b) show a third embodiment. In this one-way clutch, a separate radial receiving member 6 that receives a radial load with respect to the rotary shaft 1 is fitted in the stepped portions 2d at both ends of the inner peripheral surface of the outer member 2, and these radial receiving members are fitted. Between the members 6, each engagement element 3 is arranged in a full roller state in which the column surfaces are in contact with each other. In this embodiment, each engagement element 3 is restrained from moving in the axial direction by a radial receiving member 6. Other parts are the same as those of the first embodiment.

  In each embodiment mentioned above, it was set as the rotating shaft which rotates an inner member side, However, The one-way clutch which concerns on this invention is applicable also to what rotates an outer member side. Moreover, in each embodiment mentioned above, although the cyclic | annular elastic member was used as the garter spring, a cyclic | annular elastic member can also be used as a rubber band.

  Further, in each of the above-described embodiments and modifications, the cross-sectional shape of the columnar engagement element is circular and streamlined, but the cross-sectional shape of the engagement element only needs to be engaged with the cam surface, and may have an ellipse or a corner. It can also be a rounded rhombus.

a is a side view showing the one-way clutch of the first embodiment, and b is a cross-sectional view taken along line Ib-Ib of a. The side view which shows the modification of the engaging element of FIG. a is a side view showing the one-way clutch of the second embodiment, and b is a cross-sectional view taken along line IIIb-IIIb of a. a is a side sectional view showing the one-way clutch of the third embodiment, and b is a sectional view taken along line IVb-IVb of a.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Outer member 2a Cam surface 2b Radial receiving part 2c Concave groove 2d Step part 3 Engagement element 3a Groove 4 Gutter spring 5 Cage 5a Annular part 5b Radial receiving part 5c Projection 6 Radial receiving member

Claims (7)

  A plurality of inclined cam surfaces are provided on the inner peripheral surface of the outer member facing the outer peripheral surface of the inner member, and the cam members are engaged between the inner member and the outer member at respective circumferential positions where the cam surfaces are provided. In a one-way clutch in which a combination is disposed and each of these engagement elements is engaged with the cam surface to lock the relative rotation in one direction of the inner member and the outer member, the engagement element is connected to the shaft of the clutch. It is assumed that each of the columnar engagement elements is provided with grooves penetrating in the circumferential direction of the clutch, and an annular elastic member is passed through these grooves. The elastic member is pressed against the outer peripheral surface of the inner member, and when the outer member and the inner member are relatively rotated in one direction, the engagement elements are engaged with the cam surface. Features a one-way clutch.   The one-way clutch according to claim 1, wherein the annular elastic member is a garter spring.   The one-way clutch according to claim 1 or 2, wherein each of the columnar engagement elements is a columnar one.   The one-way clutch according to any one of claims 1 to 3, wherein a part or all of each of the columnar engaging elements is brought into contact with each other in a circumferential direction of the clutch.   The one-way clutch according to any one of claims 1 to 4, wherein a radial receiving portion that receives a radial load between the outer member and the inner member is provided on the outer member.   The one-way clutch according to claim 5, wherein the radial receiving portion is formed integrally with the outer member.   5. The unidirectional device according to claim 1, wherein a retainer that holds the engaging elements is provided between the inner member and the outer member, and a radial receiving portion that receives a radial load is provided on the retainer. clutch.

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