JP6586908B2 - Roller clutch - Google Patents

Description

  The present invention relates to a roller clutch.

  As a clutch used for home appliances and various leisure goods, for example, there is a roller clutch 201 as shown in FIG. The roller clutch 201 includes a plurality of rollers 203, a holder 210 in which the same number of roller pockets 213 as the rollers 203 are formed, a cylindrical shell 220 having the same number of cam grooves 223 as the rollers 203, and cams the rollers 203. And a spring 240 biased toward the groove 223.

  The retainer 210 is formed of synthetic resin, and as shown in FIG. 7, a pair of annular portions 211 and 212 provided at opposite ends in the axial direction of the retainer 210 and the annular portions 211 and 212 are provided. And a plurality of pillars 214 connected at equal intervals along the circumferential direction. A space between the adjacent column portions 214 becomes a roller pocket 213 for storing the roller.

  The column part 214 is integrally provided with a plane-shaped V-shaped spring 240. The spring 240 is extended and extended from the front wall 214a toward the rear wall 214b of the other pillar 214 facing the front wall 214a. Receiving portions 217 and 217 are provided on both sides of the base of the spring 240. The receiving portions 217 and 217 are located on the back side of the free end of the spring 240, and limit the amount of bending when the spring 240 bends to the base side.

  A plurality of protrusions 219 are formed at equal intervals along the circumferential direction on the outer peripheral portion of the annular portion 212 on the distal end side in the assembly direction P of the cage 210. Further, the outer diameter dimension of the annular portion 211 on the rear end side in the assembling direction P is set to be larger than the outer circumferential circle diameter of the columnar portion 214 on the front end side in the assembling direction P. The protrusion 219 has an axially vertical cross section formed in a substantially semicircular arc shape, and engages with the cam groove 223 of the shell 220. The annular portion 211 on the rear end side in the assembly direction P is fitted by being press-fitted into the shell 220.

  The roller clutch 201 having the above configuration is attached to the outer peripheral portion of the rotating shaft 204 shown in FIG. When the rotating shaft 204 is rotated in the direction of the arrow D1 in FIG. 6, the elastic restoring force of the spring 240 is also applied, and the roller 203 rolls toward the gentle slope of the cam groove 223. Then, the roller 203 is engaged between the cam groove 223 and the rotating shaft 204 by a wedge action. As a result, the roller 203 cannot rotate and the rotating shaft 204 and the shell 220 rotate integrally.

  On the other hand, when the rotating shaft 204 is rotated in the reverse direction, that is, in the direction of arrow D2 in FIG. 6, the roller 203 deflects the spring 240 rearward and rolls toward the steep slope side of the cam groove 223. Then, the roller 203 can rotate between the cam groove 223 and the rotating shaft 204. As a result, only the rotating shaft 204 rotates without the shell 220 rotating.

  Incidentally, in the roller clutch 201 shown in FIGS. 6 and 7, a synthetic resin cage 210 is press-fitted into the shell 220 and fixed. For this reason, when the operating temperature of the clutch is low or when the vibration is large, the cage 210 and the roller 203 may come out of the shell 220.

  Therefore, the roller clutch disclosed in Patent Document 1 uses a shell 220 having the shape shown in FIG. That is, in the shell 220, one opening end of the cylindrical body is bent radially inward to form a radially inward flange portion 225, and the other open end remains open. The other open end is a perfect circular cylindrical boss portion 227 in which the cam groove 223 (see FIG. 6) is not formed. In this roller clutch, a plurality of protrusions 219 whose axial vertical cross sections are substantially semicircular arcs are formed on both outer peripheral portions of the annular portions 211 and 212 of the cage 210 (see FIGS. 9A and 9B). These protrusions 219 engage with cam grooves 223 (see FIG. 6) of the shell 220 to prevent the retainer 210 from rotating with respect to the shell 220.

  In the shell 220, an annular concave groove 229 is formed on the inner peripheral surface of the cylindrical boss portion 227 facing the annular portion 212 of the cage 210. On the other hand, the retainer 210 has a protruding portion 215 that protrudes in the radial direction on the outer peripheral surface of the annular portion 212 opposite to the flange portion 225 and has a substantially semicircular axial cross section. The protrusions 215 are loosely fitted into the concave grooves 229, so that the retainer 210 is prevented from coming off from the shell 220.

JP 2011-132996 A

  In the conventional roller clutch shown in FIG. 8, a protrusion 215 is provided on the outer peripheral surface of the retainer 210, and the protrusion 215 is fitted in the groove 229 on the shell 220 side. However, when such a protrusion 215 is molded with a mold, there is a risk that the protrusion 215 may be forcibly removed and the protrusion 215 may be damaged.

  For example, as shown in FIG. 9A, a holder 210 is formed by using a first mold 101, a second mold 103, a third mold 111, and a fourth mold 113, each of which includes a sleeve 101a and a sleeve guide 101b. Think of molding. In this case, in order to take out the molded product, first, the third mold 111 is moved to the outer diameter side indicated by the arrow PA in the drawing. Then, as shown in FIG. 9B, the sleeve 101a of the first mold 101 is moved in the direction indicated by the arrow PB in the figure. In this way, the retainer 210 as a product is pushed out.

  At that time, the protrusion 215 of the retainer 210 formed by the first mold 101 interferes with the inner wall of the recess 107 for forming the protrusion of the sleeve guide 101b of the first mold 101. The protrusion 215 may be damaged due to the removal. In order to prevent excessive removal, the sleeve guide 101b of the first mold 101 may be slid in the radial direction. However, the mold structure is further complicated, leading to an increase in cost.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described matters, and an object of the present invention is to provide a roller clutch that prevents a protrusion for retaining a retainer from being damaged during molding of the retainer without increasing the mold cost. Is to provide.

The present invention has the following configuration.
(1) a plurality of rollers, a cage having a plurality of roller pockets for respectively accommodating the plurality of rollers, a cylindrical shell having cam grooves corresponding to the plurality of rollers on an inner peripheral surface, and the rollers A roller clutch that has a spring biased toward the cam groove and that transmits power only in one direction,
The shell is a locking portion having a radially inward flange portion on one side in the axial direction, and a boss portion having an annular groove portion on the inner diameter surface on the other side in the axial direction.
The retainer is formed with a protruding portion that protrudes radially outward and loosely fits into the groove portion at the other axial end.
The protrusions have the same cross-sectional shape perpendicular to the axial direction over the axial direction, and the outer shape of the cross-section perpendicular to the axial direction is the end on the other side in the axial direction from the end on the one side in the axial direction. A roller clutch characterized by being made the same or smaller toward the part.
(2) The shell has a chamfered portion extending in the circumferential direction at an edge on the inner peripheral side of the end portion on the boss portion side,
In the chamfered portion, the inner side edge portion is positioned on the inner peripheral side with respect to the outer peripheral side end portion of the protruding portion, and the outer diameter side edge portion is positioned on the outer peripheral side with respect to the outer peripheral side end portion of the protruding portion. (1) The roller clutch characterized by the above-mentioned.
(3) The cage has a protrusion that protrudes radially outward and engages with the cam groove at least at the end on the other side in the axial direction.
The roller clutch according to (1) or (2), wherein the protrusion is formed adjacent to the protrusion on the other side in the axial direction.

  According to the present invention, it is possible to prevent the retainer protrusion preventing portion from being damaged during molding of the cage without increasing the mold cost. Thereby, the productivity of the roller clutch can be improved.

It is principal part sectional drawing of the roller clutch which concerns on this invention. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is CC sectional drawing in FIG. It is a figure which shows the relationship between the cage made from a synthetic resin, and the metal mold | die which shape | molds a cage, (A) is a principal part expanded sectional view which shows the state before mold release immediately after shaping | molding, (B) is a metal mold | die. It is a capital city expanded sectional view which shows the mode at the time of making it mold release. It is sectional drawing seen from the axial direction of the roller clutch. It is a perspective view which shows a part of holder | retainer of FIG. It is principal part sectional drawing of a roller clutch. It is a figure which shows the relationship between the conventional plastic-made cage and the metal mold | die which shape | molds a cage, (A) is a principal part expanded sectional view which shows the state before mold release start immediately after shaping | molding, (B) is a metal mold | die. It is a principal part expanded sectional view which shows the mode of the projection part at the time of releasing a type | mold.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The roller clutch of the present invention has the same structure as the roller clutch shown in FIGS. 6 and 7 except that the retainer retaining structure for the shell is different. Therefore, description of members having the same configuration is simplified or omitted. Hereinafter, the retaining structure of the cage with respect to the shell will be described in detail.

  1 is a cross-sectional view of the main part of the roller clutch, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. The roller clutch 100 of this configuration example is a one-way clutch that transmits power in only one direction. The roller clutch 100 includes a plurality of rollers 3, a synthetic resin cage 10, a substantially cylindrical shell 20, and a spring (not shown). In the figure, Dax indicates the axial direction, and Dr indicates the radial direction.

  The cage 10 has a plurality of roller pockets 13 that respectively accommodate the plurality of rollers 3. The shell 20 has a cam groove 23 corresponding to the cam groove 223 of FIG. These cam grooves 23 are provided corresponding to the respective rollers 3, and the same number as the number of rollers 3. The spring (not shown) corresponds to the spring 240 in FIG. 6 and biases the roller 3 toward the cam groove 23.

  As shown in FIGS. 1 and 2, the shell 20 has a cam groove 23 at an axially intermediate portion. Here, the axial direction one side Ax1 of the shell 20 is a locking portion 20A in which a radially inward flange portion 25 is formed. The other axial side Ax2 of the shell 20 is an open boss portion 20B. The shell 20 is formed with a chamfered portion 26 in the circumferential direction at the inner peripheral edge of the opened end portion on the boss portion 20B side.

  The cage 10 made of synthetic resin has a pair of annular portions 11 and 12 and a plurality of column portions 14. The annular portion 11 on the one axial side Ax1 and the annular portion 12 on the other axial side Ax2 are arranged to face each other. The plurality of column portions 14 are provided between the annular portions 11 and 12 and connect the annular portions 11 and 12 at equal intervals along the circumferential direction. A space between adjacent column portions 14 becomes a roller pocket 13 for storing the roller. The roller 3 is urged by the above-described spring (not shown) (corresponding to the spring 240 in FIG. 6). The outer diameter surface of the annular portion 12 is fitted with a gap with respect to the boss portion 20B of the shell 20.

  Projections 27 and 28 (corresponding to the protrusions 219 in FIG. 7) are formed on the outer diameter surfaces of the annular portions 11 and 12 at both axial ends of the cage 10 at equal intervals along the circumferential direction. The The protrusions 27 and 28 engage with a cam groove 23 formed on the inner peripheral surface 21 of the shell 20, and restrict the circumferential rotation of the cage 10 with respect to the shell 20.

  An annular groove portion 30 is formed on the inner diameter surface of the boss portion 20B of the shell 20. The groove portion 30 is formed at a position facing the annular portion 12 of the cage 10.

  3 is a BB cross-sectional view in FIG. 2, and FIG. 4 is a CC cross-sectional view in FIG. As shown in FIGS. 3 and 4, the annular portion 12 is formed with a protruding portion 32 that protrudes radially outward from the outer diameter surface. The protrusion 32 is loosely fitted in the groove 30 of the shell 20. Thereby, the retainer 10 is prevented from being detached from the shell 20. Two protrusions 32 are formed in the circumferential direction and are arranged at positions facing each other. In addition, the protrusion part 32 should just be two or more, and the number of the formation is not restricted to two. Moreover, the protrusion part 32 may be formed in the cyclic | annular form continuous in the circumferential direction. In addition, predetermined gaps are provided in the axial direction and the radial direction at the fitting portion between the groove 30 and the protrusion 32. Due to this gap, even if the roller 3 collides with the cage 10, an excessive load does not act on the cage 10.

  The protrusion 32 formed on the annular portion 12 is formed adjacent to the other side Ax2 in the axial direction with respect to the protrusion 28. Further, the protrusion 32 of the retainer 10 that is loosely fitted in the groove 30 on the shell 20 side has the same cross-sectional shape in the axial direction across the axial direction. The size of the outer shape of the protrusion 32 in the cross section orthogonal to the axial direction is the same or smaller from the end 32a on the one axial side Ax1 toward the end 32b on the other axial side Ax2. In other words, the protrusion 32 on the other axial side Ax2 of the cage 10 has the same or smaller outer shape in the cross section orthogonal to the axial direction from the end 32a toward the end 32b.

  Further, the chamfered portion 26 of the shell 20 has a diameter Da at the inner diameter side edge portion 26 a that is smaller than a diameter Dt at the outer peripheral side end portion of the projection portion 32, and a diameter Db at the outer diameter side edge portion 26 b of the projection portion 32. It is larger than the diameter Dt at the outer peripheral side end. In other words, in the chamfered portion 26 of the shell 20, the position of the inner diameter side edge portion 26 a is set to the inner peripheral side with respect to the outer peripheral side end portion of the protruding portion 32, and the position of the outer diameter side edge portion 26 b is set to the outer peripheral side of the protruding portion 32. It is the outer peripheral side from the end.

  According to the roller clutch 100 described above, the axial movement of the cage 10 is caused by the annular groove portion 30 formed in the boss portion 20B of the shell 20 and the protrusion portion 32 of the cage 10 loosely fitted in the groove portion 30. It is regulated by a retaining mechanism. For this reason, even when the operating temperature of the roller clutch 100 is low or the vibration is large, the retainer 10 and the roller 3 can be reliably prevented from coming out.

  Further, the size of the outer shape in the cross section perpendicular to the axial direction of the protrusion 32 on the other axial side Ax2 of the cage 10 loosely fitted in the groove 30 on the shell 20 side is the same from the end 32a to the end 32b. Or it is getting smaller. Therefore, even if the retainer 10 has a shape in which the protrusion 32 protrudes outward in the radial direction, the protrusion 32 can be prevented from being damaged at the time of mold release after forming the retainer.

  Further, the chamfered portion 26 of the shell 20 has an inner diameter side edge portion 26 a on the inner peripheral side with respect to the outer peripheral side end portion of the projection portion 32, and an outer diameter side edge portion 26 b on the outer periphery side with respect to the outer peripheral side end portion of the projection portion 32. It is on the side. Therefore, when the retainer 10 is fitted into the shell 20, the protruding portion 32 comes into contact with the chamfered portion 26 and is smoothly guided to the groove portion 30.

Next, the molding procedure of the cage 10 will be described.
FIG. 5 is a diagram showing the relationship between the cage 10 and the first mold 101, the second mold 103, the third mold 111, and the fourth mold 113 for molding the cage 10. FIG. The principal part expanded sectional view which shows the state before mold release start after shaping | molding, (B) is a principal part expanded sectional view which shows the mode of the projection part 32 at the time of releasing a metal mold | die.

  As shown in FIG. 5 (A), the annular portion 12, the protruding portion 28 and the protruding portion 32 at the axial end of the cage 10 are a first mold 101, a second mold 103, a third mold 111, And it shape | molds using the 4th metal mold | die 113. FIG. The first mold 101 is composed of a sleeve 101a and a sleeve guide 101b, and a cavity 105 for molding the protrusion 32 of the cage 10 is defined. The third mold 111 has a cavity 115 that molds the protrusion 28 of the cage 10.

  The first mold 101 includes an inner wall surface 105a for molding the outer circumferential surface of the annular portion 12, an inner wall surface 105b for molding the outer circumferential surface 32c of the protruding portion 32, an inner wall surface 105c for molding the end surface 32d of the protruding portion 32, An inner wall surface 105d for forming the end surface 10a of the cage 10. These inner wall surfaces 105 a, 105 b, 105 c, 105 d define a cavity 105. The third mold 111 has an inner wall surface 115 a that molds the outer circumferential surface of the annular portion 12, an inner wall surface 115 b that molds the outer circumferential surface 28 a of the protrusion 28, and an inner wall surface 115 c that molds the roller pocket 13. These inner wall surfaces 115 a, 115 b, 115 c define a cavity 115.

  After the cage 10 is molded using the first mold 101, the second mold 103, the third mold 111, and the fourth mold 113, the third mold 111 is indicated by an arrow PA in the drawing. , Moved to the outer diameter side. Then, as shown in FIG. 5B, the sleeve 101a of the first mold 101 moves relative to the sleeve guide 10b as shown by the arrow PB in the figure to push out the annular portion 12.

  Here, the protrusion 32 to be molded has the same cross-sectional shape in the axial direction in the axial direction, and the size of the outer shape in the cross-section orthogonal to the axial direction is the axis from the end 32a on the one side Ax1 in the axial direction. It is the same or small toward the end 32b of the other side Ax2 in the direction. In other words, the protrusion 32 on the other axial side Ax2 of the cage 10 has the same or smaller outer shape in the cross section orthogonal to the axial direction from the end 32a toward the end 32b.

  As a result, the protrusion 32 slides on the inner wall surface 105b of the sleeve guide 101b of the first mold 101 as the sleeve 101a of the first mold 101 slides in the axial direction. Therefore, when the sleeve 101a is slid as shown by the arrow PB, the molded protrusion 32 is forcibly removed from the inner wall surfaces 105a, 105b, 105c formed on the sleeve guide 101b of the first mold 101. Without being removed smoothly and prevented from being damaged. In addition, since the sliding direction of the sleeve 101a of the first mold 101 is the axial direction and it is not necessary to move the mold in the radial direction, the mold structure is not complicated and the cost is not increased.

  Further, the chamfered portion 26 of the shell 20 has an inner diameter side edge portion 26 a on the inner peripheral side with respect to the outer peripheral side end portion of the projection portion 32, and an outer diameter side edge portion 26 b on the outer periphery side with respect to the outer peripheral side end portion of the projection portion 32. It is on the side. Therefore, when the retainer 10 is fitted into the shell 20, the protrusion 32 is smoothly guided to the groove 30 while being guided by the chamfer 26. Accordingly, the cage 10 can be smoothly incorporated into the shell 20 while preventing the protrusion 32 from being damaged due to interference with the end surface of the shell 20.

  In particular, since the protrusion 32 is formed adjacent to the other side Ax2 in the axial direction with respect to the protrusion 28, for example, a gap is formed between the protrusion 28 and the protrusion 32 in the third mold 111, for example. There is no need to provide a molding part for molding the mold, and the mold shape can be prevented from becoming complicated.

  As described above, the present invention is not limited to the above-described embodiments, but can be modified by those skilled in the art based on combinations of the configurations of the embodiments, descriptions in the specification, and well-known techniques. Application is also within the scope of the present invention and is within the scope of protection.

3 Roller 10 Cage 13 Roller pocket 20 Shell 20A Locking portion 20B Boss portion 23 Cam groove 25 Flange portion 26 Chamfered portion 26a Inner diameter side edge portion 26b Outer diameter side edge portion 27, 28 Projection portion 30 Groove portion 32 Protrusion portion 32a, 32b End 100 Roller clutch 240 Spring Ax1 One axial side Ax2 The other axial side

Claims (3)

A plurality of rollers, a cage having a plurality of roller pockets that respectively accommodate the plurality of rollers, a cylindrical shell having cam grooves corresponding to the plurality of rollers on an inner peripheral surface, and the rollers as the cam grooves A roller clutch that transmits a unidirectional power,
The shell is a locking portion having a radially inward flange portion on one side in the axial direction, and a boss portion having an annular groove portion on the inner diameter surface on the other side in the axial direction.
The retainer is formed with a protruding portion that protrudes radially outward and loosely fits into the groove portion at the other axial end.
The projecting portion has a cross-sectional shape orthogonal to the axial direction that is the same shape over the axial direction, and the size of the outer shape of the cross-section orthogonal to the axial direction is from the end on the one side in the axial direction to the end on the other side in the axial direction. A roller clutch characterized by being made the same or smaller toward the part. The shell has a chamfered portion extending in a circumferential direction at an inner peripheral side edge at an end portion on the boss portion side,
In the chamfered portion, the position of the inner diameter side edge portion is set to the inner peripheral side from the outer peripheral side end portion of the projection portion, and the position of the outer diameter side edge portion is set to the outer peripheral side from the outer peripheral side end portion of the projection portion. The roller clutch according to claim 1, wherein: The cage has a protrusion that protrudes radially outward and engages with the cam groove at least on the other axial end.
The roller clutch according to claim 1, wherein the protruding portion is formed adjacent to the protruding portion on the other side in the axial direction.

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