JP5321114B2 - One-way clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-way clutch reducing manufacturing costs without causing occurrence of warp and deteriorating assembly workability while employing a structure retaining rollers and elastic members by a retainer. <P>SOLUTION: This one-way clutch is equipped with the retainer 4 including: an annular outer diameter side member 2 having desired number of cam surfaces 11 formed on an inner circumference surfaced in a circumferential direction; a plurality of the rollers 5 disposed at plural sections in the circumferential direction between the cam surface 11 of the outer diameter side member 2 and an outer circumference surface of the inner diameter side member 3 disposed inside of the outer diameter side member 2; a plurality of elastic members 6 individually pressing each roller 5 in a direction reducing the interval between the cam surface 11 and the outer circumference surface of the inner diameter side member 3; a plurality of projections 22 disposed between the outer diameter side member 2 and the inner diameter side member 3 and provided projectingly at the annular plate 21 and at circumferential direction plural sections of one surface of the annular plate 21; and an engagement claw 26 formed on a surface of the projection opposing to an inner circumference surface of the outer diameter side member 2 from an upper end side and fitting to the inner circumference surface of the outer diameter side member 2 at a lower end part. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a one-way clutch incorporated in a starter motor type starting device such as a motorcycle or a power transmission device of various machines.

  The incorporation of a one-way clutch into a starter motor type starting device or the like such as a motorcycle has been conventionally performed as described in Patent Documents 1 and 2, for example. Among these, Patent Document 1 describes a power transmission structure between a motorcycle engine and a starter as shown in FIG. The rotation of the rotation shaft 102 of the cell motor 101 is transmitted to the crankshaft 105 via the gear transmission mechanism 103 and the one-way clutch 104. Then, the rotation of the crankshaft 105 drives the engine piston 106 to start the engine. The one-way clutch 104 transmits the rotation of the output shaft 108 to the crankshaft 105 when the output shaft 108 fixed to the large gear 107 constituting the gear transmission mechanism 103 is rotated by the start of the cell motor 101. On the other hand, after the engine is started, power transmission between the output shaft 108 and the crankshaft 105 is cut off.

A specific structure of the one-way clutch operating as described above will be described.
In Patent Document 1, a first base body that rotates in the same direction and a second base body that is fixed to the first shaft body and has a thick base board that rotates, and a shaft hole that is formed at the center of the base board. The second shaft body can be fitted, and a roller and an elastic member that presses the roller toward one end along the circumferential direction of the shaft hole are accommodated in a recess formed in the inner peripheral surface of the shaft hole. The recess is open to both end surfaces of the base board, and the open portion at one end face of the base board is closed by the first shaft body, and the open portion of the recess at the other end face of the base board A one-way clutch having a configuration in which a part of the blocking plate is bent into the recess to form a partition wall that partitions the housing portion of the elastic member and the shaft hole. Is described.

  As shown in FIGS. 10 and 11, the one-way clutch described in Patent Document 2 includes an outer ring 109, an inner diameter side member 110, a plurality of rollers 111, and each of these rollers. 111 includes the same number of springs 112 and a cover 113. Of these, the outer ring 109 is connected to, for example, the crankshaft 105 described above, and is formed with recessed portions 114 that are recessed radially outward at a plurality of positions in the circumferential direction on the inner peripheral surface. Further, the inner diameter side member 110 is connected to the output shaft 108 described above, for example, and is disposed on the inner diameter side of the outer ring 109. The rollers 111 and the springs 112 are disposed in the recesses 114, respectively. Therefore, in the case of the conventional structure, each recessed portion 114 corresponds to a pocket. The cover 113 covers the recesses 114 so that the rollers 111 and the springs 112 do not fall off the recesses 114.

  Further, the back surfaces of the respective recessed portions 114 are cam surfaces 115, respectively. The distance between each cam surface 115 and the outer peripheral surface of the inner diameter side member 110 is made smaller toward the one circumferential direction (counterclockwise in FIGS. 10 and 11). Each of the springs 112 presses each of the rollers 111 in a direction in which the interval is reduced in a state where one end is in contact with one side surface in the circumferential direction of the indented portion 114 on the side where the interval is increased. Yes. In other words, one side surface in the circumferential direction of each recessed portion 114 is a receiving portion capable of supporting the elastic force of each spring 112.

  The one-way clutch 1104 configured as described above operates as follows. That is, when the inner diameter side member 110 tends to rotate relative to the outer ring 109 in the counterclockwise direction of FIGS. 10 and 11, the rollers 111 are connected to the outer peripheral surface of the inner diameter side member 110 and the cam surfaces. It bites into a part where the space | interval between 115 is small. As a result, the inner diameter side member 110 and the outer ring 109 are locked, and power is transmitted between the inner diameter side member 110 and the outer ring 109. On the other hand, when the inner diameter side member 110 tends to rotate relative to the outer ring 109 in the clockwise direction in FIGS. 10 and 11, the rollers 111 are displaced toward the portion where the interval is large. It becomes a trend. As a result, the inner diameter side member 110 and the outer ring 109 are overrun, and no power is transmitted between the inner diameter side member 110 and the outer ring 109.

JP 2004-346951 A JP 2003-172377 A

  However, in the conventional examples described in Patent Documents 1 and 2, a recess having a relatively deep depth formed in the outer ring or the base board in order to accommodate the roller and the elastic member that presses the roller. And insert it into the pocket. For this reason, it is necessary to form recesses and pockets in a relatively thick outer ring and base board, and these recesses and pockets are punched.

However, the recess and the pocket are irregularly shaped concave shapes that become deeper from the inner ring side to the outer ring side of the outer ring or base board. There is an unsolved problem that the cam surface acting as a directional clutch becomes a fracture surface and accuracy is lowered.
In order to solve this unsolved problem, it is necessary to incorporate cost-up elements such as the need for a separate finishing process. Furthermore, if it is necessary to prevent the outer ring of the roller and spring from falling off in the axial direction, additional parts must be added. Forming the inner peripheral shape of the outer ring by total cutting is considered to be costly. Further, if the same shape is to be manufactured by forging, the unevenness is large, so that the molding stress is increased and the accuracy of the cam surface is lowered. Since the cam surface is a torque transmission surface, high shape accuracy and surface accuracy are required, and this requirement cannot be met.

For this reason, it is also considered that a roller and a spring are not accommodated in the outer ring, and a retainer that holds the roller and the spring is mounted on the inner peripheral side of the outer ring. It is necessary to fit without falling off, and the retainer is formed with a fitting projection between the inner ring surface of the outer ring and a tightening allowance for fitting the inner ring surface of the outer ring on the outer side surface of the fitting protrusion. There is a need.
In this way, when the fitting protrusion is provided on the cage and the tightening allowance for fitting the outer ring inner peripheral surface is provided on the outer side surface thereof, when the outer ring inner peripheral surface is fitted to the fitting protrusion, Depending on the shape, the cage base may be warped, and it is preferable that this warp be as small as possible.Further, if the upper surface of the fitting protrusion is tightened, the workability of assembling the outer ring and the cage may be impaired. There is a new unresolved issue that exists.

  Therefore, the present invention has been made paying attention to the unsolved problems of the above-mentioned conventional example, and it is possible to impair the occurrence of warping and the assembly workability while adopting a configuration in which the roller and the elastic member are held by a cage. It aims at providing the one way clutch which can reduce manufacturing cost.

In order to achieve the above object, a one-way clutch according to a first aspect includes an annular outer diameter side member having a required number of cam surfaces in the circumferential direction on an inner peripheral surface, and a cam of the outer diameter side member. A plurality of rollers disposed at a plurality of positions in a circumferential direction between the surface and the outer peripheral surface of the inner diameter side member disposed on the inner side of the outer diameter side member, and the rollers of the cam surface and the inner diameter side member. A plurality of elastic members that are individually pressed in a direction in which the interval between the outer peripheral surface and the outer peripheral surface is narrowed, and the outer diameter side member and the inner diameter side member, and one of the annular plate portion and the annular plate portion A plurality of protrusions projecting at a plurality of locations in the circumferential direction of the surface, and a bottom surface of the outer diameter-side member is formed on the surface facing the inner peripheral surface of the outer-diameter-side member. the inner peripheral surface and a retainer having a engagement claw which fits into the engagement groove shape to remove the stress concentration at the junction of claws of the projecting portion of the I am characterized in that it is.

According to this configuration, since the outer diameter side member is formed in an annular shape having a cam surface on the inner peripheral surface, it can be easily formed by plastic deformation such as cold forging. In addition, since the lower end of the engaging claw provided on the protrusion formed on the base member of the cage is fitted to the inner peripheral surface of the outer diameter side member, the engagement between the cage and the outer diameter side member is engaged. When the claw is fitted to the inner peripheral surface of the outer diameter side member, the bending of the engaging claw does not affect the protrusion, and it is possible to reliably prevent the base member of the cage from warping. At the same time, since the joint portion of the engaging claw is on the upper side of the protrusion and does not protrude outward, the work for assembling the cage with respect to the outer diameter side member can be easily performed.
Moreover, since the groove part which removes a stress concentration part is formed in the junction part with the engaging claw of a protrusion, when a cage | basket and an outer diameter side member fit, joining of an engaging claw and a protrusion is carried out. No stress concentration part is formed in the part, and it can withstand long-term use.

The one-way clutch according to claim 2 is characterized in that, in the invention according to claim 1, the outer diameter side member is formed by cold forging an annular blank.
According to this structure, since the outer diameter side member is formed by cold forging, the manufacturing cost of the outer diameter side member can be reduced.
The one-way clutch according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the engaging claw is fitted to a linear inner peripheral surface of the outer diameter side member.

According to this configuration, since the engaging claw is fitted to the linear inner peripheral surface of the outer diameter side member, the engagement claw and the outer diameter side member can be reliably fitted.
The one-way clutch according to a fourth aspect is the invention according to any one of the first to third aspects, wherein the engagement pawl is tightened on the inner peripheral surface of the outer diameter side member only in the vicinity of the free end. It is characterized by being comprised so that it may fit while holding.

According to this configuration, since only the vicinity of the free end of the engaging claw is fitted to the inner peripheral surface of the outer diameter side member with a tightening allowance, the assembly work of the cage and the outer diameter side member can be easily performed. Ru can be done.

According to the present invention, since the outer diameter side member constituting the one-way clutch is formed in an annular shape having a cam surface on the inner peripheral surface, it can be easily formed by plastic deformation such as cold forging, Manufacturing cost can be reduced. In addition, since the lower end of the engaging claw provided on the protrusion formed on the base member of the cage is fitted to the inner peripheral surface of the outer diameter side member, the engagement between the cage and the outer diameter side member is engaged. When the claw is fitted to the inner peripheral surface of the outer diameter side member, the bending of the engaging claw does not affect the protrusion, and it is possible to reliably prevent the base member of the cage from warping. . Furthermore, since the joint part of the engaging claw is on the upper side of the projecting part and this joint part does not protrude outward, the work for assembling the cage to the outer diameter side member can be easily performed.
Moreover, since the groove part which removes a stress concentration part is formed in the junction part with the engaging claw of a protrusion, when a cage | basket and an outer diameter side member fit, joining of an engaging claw and a protrusion is carried out. No stress concentration part is formed in the part, and it can withstand long-term use.

It is a front view which cuts out and cuts off one part and shows one Embodiment of this invention. It is a rear view of FIG. It is a side view which notches and shows a part of FIG. It is a perspective view of the holder | retainer which can be applied to this invention. It is an enlarged view of the protrusion of a cage, (a) is an expansion perspective view of a protrusion, and (b) is an enlarged front view of a protrusion. It is the perspective view which looked at the holder | retainer from the back surface side. It is explanatory drawing explaining the fitting operation | movement of an engaging claw. It is explanatory drawing which shows the manufacturing method of an outer ring | wheel. It is a schematic diagram which shows an example of the stator motor type starter incorporating the one-way clutch used as the object of the present invention. It is sectional drawing which shows the prior art example of a one-way clutch. It is the elements on larger scale of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of the present invention, in which 1 is a one-way clutch. The one-way clutch 1 includes an outer ring 2 as an outer diameter side member, a cylindrical inner diameter side member 3 disposed concentrically at a predetermined interval inside the outer ring 2, and the outer ring 2 and the inner diameter side. It is comprised with the holder | retainer 4 arrange | positioned between the members 3, the some 6 roller 5 hold | maintained at this holder | retainer 4, and the spring 6 as a some 6 elastic member which presses these rollers 5 separately. Has been.

The outer ring 2 includes a cylindrical portion 12 in which a plurality of, for example, six linear side wall cam surfaces 11 are formed at equal intervals on the inner peripheral surface, and a radial direction from one axial end of the cylindrical portion 12. It is comprised by the inward ridge part 13 which protrudes inward.
The cage 4 is formed by injection molding a synthetic resin material or by molding a metal material. As shown in FIGS. 4 to 6, the retainer 4 has an annular base member 21 having a relatively small thickness, and the base member 21. And a plurality of six protrusions 22 formed integrally and projecting at a predetermined interval in the circumferential direction on one end face.

Here, the base member 21 is formed in a hexagonal shape whose outer peripheral edge is inscribed in the cam surface 11 of the inner peripheral surface of the outer ring 2 described above, and the inner peripheral surface is a cylindrical surface that circumscribes the outer peripheral surface of the inner diameter side member 3. Is formed.
Further, the protrusion 22 is formed so as to protrude from the center of each side of the outer peripheral surface of the base member 21 slightly toward the clockwise direction. The protrusion 22 is formed with a pocket 23 formed of a cylindrical surface for holding the roller 6 on one end surface in the circumferential direction, for example, the counterclockwise end surface, and holds the spring 6 on the other end surface in the circumferential direction, for example, the clockwise end surface. A square-shaped pocket 24 is formed when viewed from above.

Further, the inner peripheral surface of the protrusion 22 is a cylindrical surface having the same curvature as the inner peripheral surface of the base member 21, and the outer peripheral surface has a concave groove 25 extending vertically to the base member 21 at the center in the circumferential direction. Is formed, and a flexible engaging claw 26 is integrally formed in the concave groove 25.
As clearly shown in FIGS. 5 and 7, the engaging claw 26 includes a joint 27 that joins the upper end of the protrusion 22 in the concave groove 25, and a lower surface of the base member 21 that extends downward from the joint 27. A vertical plate portion 28 extending to the vicinity and having the same outer peripheral surface as the outer peripheral surface of the protrusion 22, and outward from the outer peripheral surface of the protrusion 22 formed at the lower end portion serving as a free end of the vertical plate portion 28. And a fitting projection 29 that protrudes a predetermined height to form a tightening allowance. Further, groove portions 30 for removing stress concentration are formed on both sides in the circumferential direction of the joint portion 27 of the protrusion 22.

Next, the operation of the above embodiment will be described.
In order to assemble the one-way clutch 1, first, the cage 4 is mounted on the inner peripheral side of the outer ring 2. The retainer 4 is mounted with the inner ring 13 of the outer ring 2 facing upward, the open end of the cylindrical part 12 facing downward, and the protrusion 22 of the retainer 4 facing upward. 2, the cage 4 is opposed to the cam surface 11 of the outer ring 2 and the outer peripheral surface of the protrusion 22 of the cage 4. In this state, as shown in FIG. 7A, the outer peripheral surface of the vertical plate portion 28 of the engaging claw 26 formed on the protrusion 22 faces the cam surface 11 of the outer ring 2. In this state, at least one of the outer ring 2 and the cage 4 is brought close to the other, and the outer peripheral surface of the protrusion 22 of the cage 4 is inserted into the cam surface 11 of the outer ring 2.

At this time, the outer peripheral surface of the protrusion 22 of the cage 4 is formed in a shape that can be inserted into the cam surface 11 of the outer ring 2 except for the fitting protrusion 29 of the engaging claw 26, and bites into the cam surface 11. Since there is no protrusion, the protrusion 22 can be easily inserted into the inner peripheral side of the cam surface 11 as shown in FIG.
When the fitting projection 29 of the engaging claw 26 comes into contact with the cam surface 11, the vertical plate portion 28 of the engaging claw 26 is bent inward as shown in FIG. The outer peripheral surface of the portion 29 is fitted to the inner peripheral surface of the cam surface 11. The fitting of the retainer 4 to the outer ring 2 is completed by pushing in until the upper end of the protrusion 22 of the retainer 4 comes into contact with the inward flange 13 of the outer ring 2 while maintaining this fitting state. At this time, since the engaging claw 26 is smaller in width and thickness than the protrusion 22, a large elastic force can be obtained. When the fitting protrusion 29 is fitted to the cam surface 11, the vertical plate Even if the portion 28 is bent, the influence is not transmitted to the protrusion 22, and it is possible to reliably prevent the base member 21 from warping.

The spring 6 is attached to the pocket 24 formed in the protrusion 22 of the retainer 4 after or before the retainer 4 is attached to the outer ring 2, and the roller 5 pressed by the spring 6 is attached.
Thereafter, the inner diameter side member 3 is inserted into the inner peripheral side of the cage 4, and the roller 5 is brought into contact between the outer peripheral cylindrical surface of the inner diameter side member 3 and the cam surface 11 of the outer ring 2, whereby the one-way clutch. 1 can be configured.

  When the one-way clutch 1 is configured in this way, in the state where the inner diameter side member 3 rotates relative to the outer ring 2 in the clockwise direction as viewed in FIG. 1, the inner diameter side member 3 is rotated in the clockwise direction. The roller 5 in contact with the outer peripheral surface bites into a portion where the distance between the outer peripheral surface of the inner diameter side member 3 and the cam surface 11 is narrowed. As a result, the inner diameter side member 3 and the outer ring 2 are locked, and power is transmitted between the inner diameter side member 3 and the outer ring 2.

  On the other hand, in a state where the inner diameter side member 3 rotates relative to the outer ring 2 in the counterclockwise direction of FIG. It will be displaced towards. As a result, the inner diameter side member 3 and the outer ring 2 are overrun, and transmission of power is interrupted between the inner diameter side member 3 and the outer ring 2.

Next, the manufacturing method of the outer ring | wheel 2 mentioned above is demonstrated based on FIG.
First, as shown in FIG. 8A, a metal annular blank 31 having an inner diameter smaller than the diameter of the inscribed circle of the cam surface 11 of the outer ring 2 is prepared. ), The outer peripheral surface is restrained by the die 33 in a state of being placed on the pedestal 32. In this state, as shown in 8 (b), the punch 34 is pushed in the axial direction into a portion near the inner diameter of the annular blank 31. The outer peripheral surface of the punch 34 has a male-female shape that matches the inner peripheral surface of the cylindrical portion 12 of the outer ring 2. For this reason, the cam surface 11 of the outer ring 2 is formed on the inner peripheral surface of the annular blank 31 by pushing the punch 34. In the case of this example, the surplus portion near the inner diameter of the annular blank 31 generated by the pressing of the punch 34 is moved to one end side (lower end side in FIG. 8) of the annular blank 31.

  By moving the surplus portion as described above to one end of the annular blank 31, one end surface of the annular blank 31 protrudes radially inward from the cam surface 11, and one end of the annular blank 31 is An element facing portion 35 is formed in the portion. That is, since the outer peripheral surface of the annular blank 31 is constrained by the die 33, as shown in FIG. The slanted lattice portion) flows to one end portion (the pear ground portion) of the annular blank 31. As a result, one end of the annular blank 31 protrudes inward in the radial direction, and the inwardly facing flange 35 is formed. In the case of this example, the other end surface (upper end surface in FIG. 8) of the annular blank 31 is pressed by a pressing member (not shown), and the lateral direction of the annular blank 31 (upper and lower in FIG. Direction) is not changed. For this reason, the thickness of the annular blank 31 is the same as the thickness of the outer ring 2 after processing.

  After the processing by the punch 34 as described above, as shown in FIG. 8 (c), the portion closer to the inner diameter of the inner inwardly facing flange portion 35 is punched and removed by another punch 34a. The outer diameter of the punch 34 a is the same as the inner diameter of the inward flange 13 of the outer ring 2. For this reason, the inner inward flange portion 13 having a predetermined inner diameter is formed by punching out the inner inward flange portion 35 with the punch 34a, and the desired outer ring 2 can be obtained.

Thus, by manufacturing the outer ring 2 by cold forging, it is possible to sufficiently ensure the strength of the portion of the outer ring 2 where the cam surface 11 is formed, and to prepare the outer ring 2 with high accuracy. The manufacturing cost of the one-way clutch 1 can be reduced.
That is, in the case of this example, the cam surface 11 is formed by plastically deforming the inner peripheral surface of the metal annular blank 31 to obtain the outer ring 2. For this reason, the strength and rigidity of the portion where the cam surface 11 is formed can be sufficiently ensured. In the case of this example, since the inward flange portion 13 is formed integrally with the cylindrical portion 12 having the cam surface 11, the strength and rigidity of the outer ring 2 are improved, and the portion where the cam surface 11 is formed It can be made difficult to deform. As a result, when power is transmitted from the inner diameter side member 3 to the outer ring 2, even if force is applied from each roller 5 to the cam surface 11, the portion where the cam surface 11 is formed is deformed radially outward. Thus, the power transmission by the one-way clutch 1 can be sufficiently performed.

  In the case of this example, since the pockets 23 and 24 in which the rollers 5 and the springs 6 are disposed are formed in the cage 4, it is not necessary to provide such pockets in the outer ring 2. Therefore, it is only necessary to form the cam surface 11 on the inner peripheral surface of the cylindrical portion 12 of the outer ring 2, and the unevenness of the inner peripheral surface of the cylindrical portion 12 can be reduced. In other words, what is formed on the inner peripheral surface of the cylindrical portion 12 is only the cam surface 11 having a small unevenness (small change in inner diameter in the circumferential direction) as compared with the pockets 23 and 24. Therefore, the stress at the time of molding of the outer ring 2 can be reduced, and the cam surface 11 can be easily and accurately formed by pushing the punch once.

  In the case of this example, since the cam surface 11 is formed by plastically deforming the inner peripheral surface of the annular blank 31, the cam surface is formed by punching, and the conventional method shown in FIGS. 10 and 11 described above. The fracture surface does not occur as in the case of the structure. For this reason, it is not necessary to finish the cam surface 11 or only a small amount of finish is required. In the case of this example, the inwardly facing flange portion 35 can be formed simultaneously with the formation of the cam surface 11, and then the inwardly facing flange portion 13 can be obtained simply by removing the portion closer to the inner diameter of the element inwardly facing flange portion 35. Therefore, in the case of this example, the number of processing steps for forming the outer ring 2 can be reduced. As a result, the outer ring 2 can be manufactured easily and accurately at low cost.

  On the other hand, the cage 4 only needs to be able to support the elastic force of each spring 6, and no large force is applied from each roller 5. For this reason, the cage 4 does not need to have higher strength than the outer ring 2 and can be easily formed by, for example, molding a synthetic resin or an aluminum alloy. In the case of this example, one side surface in the circumferential direction of each protrusion 22 is a pocket 24 that can support the elastic force of each spring 6, and there is no need to provide a bottomed groove for arranging the spring 6. The manufacturing cost of the cage 4 can be reduced.

In the case of this example , the inward flange 13 is formed integrally with the outer ring 9, and each roller 5 and each spring 6 are disposed between the inward flange 13 and the annular base member 21 of the cage 4. doing. Therefore, as in the conventional examples of FIGS. 10 and 11, the rollers 5 and the springs 6 are prevented from dropping from the pockets 23 and 24 of the cage 4 without providing a cover or the like separately. it can.

  DESCRIPTION OF SYMBOLS 1 ... One-way clutch, 2 ... Outer ring, 3 ... Inner diameter side member, 4 ... Cage, 5 ... Roller, 6 ... Spring, 11 ... Cam surface, 12 ... Cylindrical part, 13 ... Inward flange part, 21 ... Base member, 22 ... Projection, 23, 24 ... Pocket, 26 ... Engagement Claw, 27 ... Joint, 28 ... Vertical Plate, 29 ... Fitting Projection, 30 ... Groove, 31 ... Circular Blank, 32 ... Base, 33 ... Die, 34 ... Punch, 35 ... Inward buttock

Claims (4)

An annular outer diameter side member having a required number of cam surfaces formed in the circumferential direction on the inner circumferential surface;
A plurality of rollers disposed at a plurality of positions in a circumferential direction between the cam surface of the outer diameter side member and the outer peripheral surface of the inner diameter side member disposed on the inner side of the outer diameter side member;
A plurality of elastic members that individually press each roller in a direction in which the interval between the cam surface and the outer peripheral surface of the inner diameter side member is reduced;
An annular plate portion disposed between the outer diameter side member and the inner diameter side member, and a plurality of protrusions protruding at a plurality of circumferential positions on one surface of the annular plate portion; A cage having an engaging claw that is formed from the upper end side on the surface facing the inner peripheral surface of the outer diameter side member of the portion and the lower end portion is engaged with the inner peripheral surface of the outer diameter side member ;
A groove for removing stress concentration is formed in a joint portion of the engaging claw of the protrusion . The one-way clutch according to claim 1, wherein the outer diameter side member is formed by cold forging an annular blank. The one-way clutch according to claim 1 or 2, wherein the engagement claw is fitted to a linear inner peripheral surface of the outer diameter side member. The engagement claw is configured so that only the vicinity of the free end is fitted to the inner peripheral surface of the outer diameter side member while having a tightening margin. One-way clutch described in.

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