JP5335122B2 - Roller type one-way clutch for motorcycle starters - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller type one-way clutch stable in the movement in operation of an accordion spring, by preventing abrasion and breaking by rubbing, without slidingly rubbing the accordion spring with an outer ring inner diameter part and a cage outer diameter part or an inner ring raceway surface, by eliminating a variation in a relative position of the accordion spring and an outer ring. <P>SOLUTION: This roller type one-way clutch includes the outer ring for forming a pocket having a cam surface on an inner surface, an inner ring separated to the inner diameter side in the radial direction to the outer ring, relatively rotatably arranged in a concentric shape and having an annular outer peripheral raceway surface, a plurality of rollers arranged in the pocket, engaging with the cam surface and transmitting torque between the outer ring and the inner ring, and the accordion spring arranged in the pocket and energizing the rollers in the engaging direction with the cam surface, and is characterized in that one end of the accordion spring is fixed to an end surface in the axial direction of the outer ring. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a roller type one-way clutch used as a component for torque transmission, backstop, etc. in a drive device such as an automobile or an industrial machine.

  Generally, a roller type one-way clutch is arranged between an outer ring, an inner ring arranged concentrically with the outer ring, an outer ring of the inner ring and an inner cam surface of the outer ring, and a plurality of rollers for transmitting torque, It consists of a spring that contacts the idle side.

  In such a configuration, the one-way clutch rotates the inner ring in only one direction with respect to the outer ring by a cam mechanism including a roller and a cam surface. That is, the inner ring is idled in one direction with respect to the outer ring, and rotational torque is applied to the outer ring via the cam mechanism only in the opposite direction.

  In the roller type one-way clutch, a roller as a torque transmission member and a spring for biasing the roller are arranged in a pocket provided in the outer ring or the inner ring in order to obtain a reliable engagement.

  In particular, in a roller type one-way clutch for a motorcycle, since the number of rollers is small (for example, 3 to 6), the design torque capacity may not be ensured unless the respective rollers are engaged with each other. For this reason, it is important to positively remove foreign matters that adversely affect the meshing performance of the rollers.

  As shown in FIGS. 5 and 9 of Patent Document 1, the one-way clutch used in a two-wheeler starter has a side plate with a spline provided in the inner diameter portion attached to the outer ring of the roller type one-way clutch with a bolt. Yes.

  In addition, as a lubrication system for the roller type one-way clutch, there are a lubrication system described in Patent Document 1 and a lubrication system used in a dry state without oil lubrication. Roller type one-way clutches used in motorcycle starters are used under conditions of high rotation, high vibration, and severe dust environment. Tends to accumulate.

  Prior art document information related to the invention of this application includes the following.

JP-A-5-44615

  Foreign substances such as dust accumulated in the roller type one-way clutch have an adverse effect on the meshing performance, so it is desirable to remove them. There is also a need for a roller type one-way clutch for a starter with lower cost.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a roller type one-way clutch that has improved meshing reliability and cost reduction at the same time in a roller type one-way clutch provided with a side plate having a spline provided in the inner diameter portion. is there.

In order to achieve the above object, the roller type one-way clutch of the present invention is:
An outer ring formed with a pocket having a cam surface on the inner periphery;
An inner ring arranged concentrically on the inner diameter side of the outer ring,
A plurality of rollers disposed in the pocket, engaged with the cam surface, and transmitting torque between the outer ring and the inner ring;
A cage that includes a cylindrical portion having a window for holding a roller, and a flange portion that extends from the cylindrical portion in the outer diameter direction and fits into a step portion provided on the inner diameter side of the outer ring, and is rotatable relative to the outer ring. When,
A spring disposed between the outer ring and the roller in the pocket, one end fixed to the outer ring, and urging the roller in a direction of engagement with the cam surface;
A side plate fixed to the side surface of the outer ring by a rivet inserted in a plurality of axially penetrating holes provided in the outer ring, and having a spline groove on the inner diameter part;
The side plate is provided with a hole through which the rivet passes and a foreign matter discharge hole for removing the foreign matter to the outside.

  Further, the foreign matter discharge hole is provided at a position facing the large-diameter portion of the pocket and the side surface of the outer ring on the step side, and the rivet does not penetrate the outer ring.

  Furthermore, the pitch circle diameters of the through hole through which the rivet for attaching to the outer ring passes and the foreign matter discharge hole of the side plate are different.

  The foreign matter discharge hole has a circular cross section.

According to the roller type one-way clutch of the present invention, the following effects can be obtained.
By the flanged cage having the cylindrical portion provided with the window, the cage does not pop out on the opposite side of the side plate, and the roller is housed in the window of the cage, so that the roller can be prevented from popping out. Accordingly, it is not necessary to provide a hub plate or the like for preventing the roller from protruding as described in Patent Document 1, and the cost of the roller type one-way clutch can be reduced.

  Also, by providing a foreign matter discharge hole in the side plate at a position corresponding to the outer ring pocket, it is possible to discharge foreign matter more smoothly from the side plate side when the outer ring rotates, and prevent foreign matter from accumulating in the roller type one-way clutch. This improves the meshing reliability of the roller type one-way clutch.

  The foreign matter discharge hole provided in the side plate determines the circumferential phase of the punch position of the press when the side plate is fixed to the outer ring with a rivet by a press machine. For this reason, it can utilize for the guide hole of the guide pin for the positioning provided in the press. Further, by making the foreign matter discharge hole circular, the processing and positioning of the foreign matter discharge hole and the guide pin can be easily created.

  In addition, the foreign matter discharge hole is provided at a position facing the large diameter part of the pocket of the outer ring and the side surface of the outer ring, so that the rivet does not penetrate the outer ring. Can be prevented. Also, foreign matter from the pocket is smoothly discharged from the maximum diameter portion of the pocket by centrifugal force due to rotation of the outer ring.

  The rivet is inserted into the foreign material discharge hole of the side plate when setting the side plate by setting the rivet on the rivet guide plate by making the pitch circle diameter of the rivet through hole provided in the outer ring and the foreign material discharge hole of the side plate different. Can be prevented, workability can be improved, and erroneous assembly can be prevented.

  As described in Patent Document 1, the present invention provides a through hole facing the through hole of the outer ring on the side plate, passes the rivet through the outer ring from the side plate side, crushes it with a press, and fixes it to the outer ring. As compared with the case where the side plate is fixed by the tapping, the side plate need not be tapped.

  The term “foreign matter” used in the present specification includes metal powder, wear powder, dust, and cutting powder generated by rubbing and meshing between members. It also includes the fine dust that the lubricant carries. This includes everything that occurs inside the roller-type one-way clutch and anything that enters from the outside.

FIG. 1 is a front view showing a roller type one-way clutch of the present invention. FIG. 2 is an axial sectional view taken along line XX in FIG. FIG. 3 is a front view showing a roller type one-way clutch viewed from the opposite side of FIG. FIG. 4 is a front view of the side plate. FIG. 5 is a cross-sectional view in the axial direction along line YY in FIG. FIG. 6 is a cross-sectional view for explaining a method of assembling and fixing the side plate to the outer ring.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the Example demonstrated below only shows this invention as an illustration, and it cannot be overemphasized that other changes are possible.

  FIG. 1 is a front view showing a roller type one-way clutch of the present invention, and FIG. 2 is an axial sectional view taken along line XX of FIG. FIG. 3 is a front view showing a roller type one-way clutch viewed from the opposite side of FIG.

  1 to 3 show a state where the roller is engaged with the cam surface, that is, a state where the one-way clutch is locked. From this state, when the outer ring rotates in the direction of the arrow, the lock is released and the one-way clutch rotates idly.

  As shown in FIG. 1, the roller type one-way clutch 30 is spaced apart from the outer ring 1 on the radially inner diameter side with an annular outer ring 1 having a pocket 4 formed as a recess having a cam surface 12 on the inner periphery. The inner ring 2 having an annular outer raceway surface 11 that is concentrically disposed so as to be rotatable relative to the inner ring 2, and a plurality of torques transmitted between the outer raceway surface 11 of the inner ring 2 and the cam surface 12. The roller 3 is included.

  The pockets 4 provided on the inner diameter side of the outer ring 1 are provided at three locations in the circumferential direction. Further, stepped rivet holes 8 that are used to fix a side plate 20 (described later) to the outer ring 1 and penetrate in the axial direction are also provided at three locations equally in the circumferential direction. As shown in FIG. 1, the pockets 4 and the rivet holes 8 are alternately arranged at equal intervals. Needless to say, the number of pockets 4 can be set to a plurality of pockets such as 3 to 6, for example, according to the magnitude of torque.

    As shown in FIGS. 1 to 3, the one-way clutch 30 includes a cage 6 that holds the roller 3, and the cage 6 extends from the cylindrical portion 10 and one axial end of the cylindrical portion 10 in the outer diameter direction. An existing annular flange portion 17 is provided. Further, the cage 6 has windows 18 penetrating in the radial direction corresponding to the number of the rollers 3.

  The window 18 provided in the cylindrical portion 10 of the cage 6 penetrates in the radial direction, but is closed at both the flange portion 17 side and the end portion facing the flange portion 17 in the axial direction. That is, the roller 3 is seated in a substantially rectangular window 18 and is supported by four sides of the window 18.

  As shown in FIG. 2, an annular step portion 13 is provided at the axial edge of the inner peripheral surface of the outer ring 1, and the flange portion 17 of the cage 6 is engaged with the step portion 13. The axial depth of the step portion 13 is slightly larger than the thickness of the flange portion 17, and when the flange portion 17 engages with the step portion 13, the axial end surface of the outer ring 1 (the end surface opposite to the axial end surface 21). And the end face in the axial direction of the flange portion 17 are approximately flush with each other. Moreover, the outer diameter of the step part 13 is slightly larger than the outer diameter of the flange part 17 of the retainer 6, and the flange part 17 is fitted to the step part 13 with a predetermined clearance. Thereby, the cage 6 can rotate relative to the outer ring 1.

  As shown in FIGS. 1 and 3, the roller type one-way clutch 30 includes an accordion spring 5 that is disposed in the pocket 4 and biases the roller 3 in the direction of engagement with the cam surface 12.

  One end portion of the accordion spring 5, that is, the tab 15 is fixed to the axial end surface 21 of the outer ring 1 as shown in FIG. The other end of the accordion spring 5 is held between the axial end surface of the roller 3 and the flange portion 17 of the cage 6.

  As shown in FIGS. 1 and 2, the accordion spring 5 includes a bellows portion 22 having a bellows-like shape bent in the axial direction of the accordion spring 5. The bellows portion 22 is extendable and contractible, and applies a biasing force to the roller 3 so that the roller 3 engages with the cam surface 12.

  The tab 15 of the accordion spring 5 is fixed to the axial end surface 21 of the outer ring 1 by, for example, welding, spot welding, adhesion, soldering or the like.

  Since the accordion spring 5 is fixed to the end surface 21 in the axial direction of the outer ring 1, the relative position of the accordion spring 5 and the outer ring 1 hardly varies. For this reason, it becomes possible to prevent wear and breakage due to rubbing with the outer ring inner diameter part, the cage outer diameter part, or the inner ring raceway surface.

  In addition, the movement of the accordion spring 5 during operation is not affected by the outer ring 1 and the cage 6, and a stable and smooth movement is possible. Thereby, the meshing property of the roller is improved.

  Next, the side plate 20 will be described in detail. The side plate 20 is fixed to the outer ring 1 from the step 13 side of the outer ring by rivets 24 provided in the outer ring 1 and inserted into a plurality of rivet holes 8 penetrating in the axial direction. Further, the side plate 20 has a spline groove 25 on its inner diameter portion. An engine crankshaft (not shown) is engaged with the spline groove 25.

  As can be seen from FIG. 2, the side plate 20 has a predetermined clearance with respect to the axial end surface of the inner ring 2 on the inner diameter side. The spline groove 25 is located in a cavity on the inner diameter side of the inner ring 2. The side plate 20 is fixed to the outer ring 1 by a rivet 24 so that the flange portion 17 of the cage 6 is sandwiched between the step portion 13 of the outer ring 1. The inner ring 2 is engaged with a pinion of a starter motor (not shown).

  As shown in FIG. 3, the side plate 20 has alternately three through holes 27 through which rivets penetrate and three foreign matter discharge holes 23 for removing foreign matters to the outside in the circumferential direction. The through hole 24 is provided so that the phase in the circumferential direction is the same as that of the rivet hole 8 provided in the outer ring 1. Further, the foreign matter discharge hole 23 having a circular cross section is provided so that the phase in the circumferential direction is the same as that of the large diameter portion of the pocket 4. Therefore, when the side plate 20 is fixed to the outer ring 1, the through hole 27 and the rivet hole 8 are opposed to each other and fixed by the rivet 24. This fixing method will be described later with reference to FIG.

  In a state where the side plate 20 is fixed to the outer ring 1, a part of the pocket 4 can be seen from the foreign substance discharge hole 23 that has penetrated. In FIG. 3, a part of the pocket 4 can be seen from the lower left and right foreign matter discharge holes 23. The other foreign matter discharge hole 23 is not visible because it is broken at the top in FIG.

  Next, the structure of the side plate 20 is demonstrated using FIG.4 and FIG.5. 4 is a front view of the side plate, and FIG. 5 is an axial cross-sectional view taken along line YY of FIG. As shown in FIG. 4, the side plate 20 is provided with a through hole 27 and a foreign matter discharge hole 23 that penetrate in the axial direction. In the embodiment, both the foreign matter discharge hole 23 and the through hole 24 have a circular cross section, but the foreign matter discharge hole 23 has a large diameter.

  The center of the side plate 20 penetrates in the axial direction, and the spline groove 25 is provided in the inner diameter as described above. A disc-shaped concave portion 26 is provided on the outer diameter side from the spline groove 25. As shown in FIG. 5, the recess 26 has a predetermined depth in the axial direction and a predetermined clearance with the inner ring 2.

  The pitch circle diameter of the foreign matter discharge hole 23 is different from the pitch circle diameter of the through hole 27. Here, the pitch circle A of the foreign matter discharge hole 23 is larger than the pitch circle B of the through hole 27. Therefore, the pitch circle of the rivet hole 8 of the outer ring 1 facing the through hole 27 in the axial direction is substantially the same as the pitch circle B of the through hole 27, and the pitch circle of the foreign matter discharge hole 23 has a large diameter. This is to prevent workability and misassembly when the side plate 20 is assembled as will be described later. Further, if the diameter of the foreign matter discharge hole 23 is made larger than the diameter of the through hole 27, the identification when inserting the rivet into the side plate becomes easier, the workability and the prevention effect of misassembly are improved, and the dust discharge property. Can also be expected.

  Next, a method for assembling and fixing the side plate 20 to the outer ring 1 will be described with reference to FIG. In order to attach the side plate 20 to the outer ring 1 in the roller type one-way clutch 30, the following is performed. First, the rivet guide plate 32 provided with holes 37 and 38 corresponding to the foreign matter discharge hole 23 and the through hole 27 is placed on the crimping base 31 having a flat upper surface.

  With the head 36 of the rivet 24 fitted in the hole 37 of the rivet guide plate 32, the side plate 20 and the outer ring 1 are connected with the rivet 24 inserted through the through hole 27 of the side plate 20 and the rivet hole 8 of the outer ring 1. Overlay on the rivet guide plate 32.

  A rivet pressing pin 34 is fitted in the rivet hole 8 of the outer ring 1 in order to press and crimp the rivet 24. The other end of the rivet 24 is crimped by the rivet pressing pin 34 being lowered in FIG. 6 by a press machine (not shown), and the side plate 20 is fixed to the outer ring 1. In FIG. 6, the broken line indicates the end of the rivet 27 before caulking.

  The foreign matter discharge hole 23 provided in the side plate 20 determines the phase in the circumferential direction of the rivet pressing pin 34 when the side plate 20 is fixed to the outer ring 1 with the rivet 24 by a press machine. For this reason, it can utilize as a guide hole of the guide pin 33 for positioning provided in the press. FIG. 6 shows a state in which the guide pin 33 is fitted in the foreign matter discharge hole 23. In addition, since the foreign matter discharge hole 23 has a circular cross section, the processing and positioning of the foreign matter discharge hole 23 and the guide pin 33 can be easily created.

  The foreign matter discharge hole 23 is provided at a position facing the large diameter portion (cam surface 12 side) of the pocket 4 of the outer ring 1 and the side surface of the outer ring, and the rivet 24 does not penetrate the outer ring 1. Thereby, it is possible to prevent an error in which the outer ring 1 and the side plate 20 are fixed by the rivet 24 at the position of the foreign matter discharge hole 23. Also, foreign matter from the pocket 4 is smoothly discharged from the large-diameter portion having the largest diameter of the pocket 4 by centrifugal force due to rotation of the outer ring.

  As described above, the rivet 24 is arranged on the rivet guide plate 32 to set the side plate 20 by making the diameters of the pitch circles of the rivet hole 8 provided in the outer ring 1 and the foreign matter discharge hole 23 of the side plate 20 different. Sometimes it is possible to prevent the rivet 24 from being erroneously inserted into the foreign matter discharge hole 23 of the side plate 20, thereby improving workability and preventing erroneous assembly.

  The present invention is used as a component such as torque transmission and backstop in a drive device such as an automobile or an industrial machine, but is particularly effective when used for a two-wheeled passenger car.

1 outer ring 2 inner ring 3 roller 4 pocket 5 accordion spring 6 cage 8 rivet hole 12 cam surface 15 tab 20 side plate 21 axial end surface 22 bellows portion 23 foreign matter discharge hole 24 rivet 25 spline groove 27 through hole 30 roller type one-way clutch

Claims (5)

An outer ring in which a pocket having a cam surface is formed on the inner periphery, and a rivet hole into which a rivet is fitted is provided;
An inner ring arranged concentrically on the inner diameter side of the outer ring,
A plurality of rollers disposed in the pocket, engaged with the cam surface, and transmitting torque between the outer ring and the inner ring;
A spring disposed between the outer ring and the roller in the pocket, one end fixed to the outer ring, and urging the roller in a direction of engagement with the cam surface;
A foreign matter discharge hole for removing foreign matter to the outside, a side plate provided with a through hole through which the rivet passes, and fixed to the outer ring by the rivet;
A method of assembling and fixing the side plate of the roller type one-way clutch provided with the outer ring,
Preparing a rivet guide plate provided with holes corresponding to the foreign matter discharge holes and the through holes,
Arranging the foreign matter discharge hole at a position corresponding to the large diameter portion of the pocket and the side surface of the outer ring;
A step of assembling the side plate to the outer ring by stacking the side plate and the outer ring on the rivet guide plate in a state where the rivet is inserted through the through hole of the side plate and the rivet hole of the outer ring, respectively.
Fixing the side plate to the outer ring by caulking the rivets;
Having a method.   The method according to claim 1, further comprising placing the rivet guide plate on a caulking base.   The method according to claim 1, further comprising a step of fitting a guide pin for positioning into the foreign object exclusion hole.   4. The method according to claim 1, wherein pitch diameters of the through holes and the foreign matter discharge holes of the side plates are different from each other. 5.   The method according to claim 1, wherein the foreign matter discharge hole has a circular cross section.

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