JP2012159105A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-way clutch extending the service life of the same by circulating grease using the rotation of a holder.SOLUTION: In the one-way clutch having the first rotation part 51, the second rotating part 54 arranged coaxially in the outer diameter side of the first rotation part 51, a wedge space which is formed between the first rotation part 51 and the second rotation part 54 and in which the space is gradually decreased in a peripheral direction, a cylindrical holder 61 which is interposed into the wedge space and in which a plurality of pockets 61a are formed in the peripheral direction, engaging elements 62 rotatably supported in the respective pockets 61a, and biasing means 63 biasing the engaging elements 62 to the one side of the wedge space, grooves 80 for circulating grease passing through the radial direction and inclined such that the outer diameter sides are positioned at front positions in the rotational direction of the holder 61 relative to the inner diameter sides are formed in the end surfaces of the holder 61.

Description

  The present invention relates to a one-way clutch used in a pulley apparatus.

  As an example in which a conventional pulley device with a one-way clutch is attached to an AC generator (alternator), there is one shown in FIG.

  The pulley device 100 with a one-way clutch includes a rotating shaft 101 attached to a power generating shaft 111 of an AC generator 110, roller bearings 102 and ball bearings 103 disposed on the outer peripheral side of the rotating shaft 101, roller bearings 102, and The pulley unit 104 is rotatably supported on the rotary shaft 101 via the ball bearing 103, and the one-way clutch 105 disposed between the rotary shaft 101 and the pulley unit 104.

  As shown in FIG. 5, the one-way clutch 105 includes a cylindrical cage 120 that rotates integrally with the rotation shaft 101, an engagement member 122 that is rotatably held in each pocket 121 of the cage 120, and a rotation shaft. The wedge space 123 is formed between the pulley 101 and the pulley 104, and the space gradually decreases in the circumferential direction. The spring 124 presses the engagement element 122 in the direction of biting into the wedge space 123.

  The cylindrical roller bearing 102, the ball bearing 103, and the one-way clutch 105 are incorporated into the pulley device 100 with a one-way clutch in a state where grease is applied.

  The grease applied to the one-way clutch 105 moves to the pulley 104 side by centrifugal force, and the grease adhering to the inner periphery of the pulley 104 is pushed away by the engagement element 122 that rolls on the inner periphery of the pulley 104. The pulley 104 moves to the both sides in the axial direction of the engagement element 122 on the inner circumference.

JP 2010-19317 A

  The cage 120 does not have a function of returning the grease to the inner diameter side when rotated with respect to the pulley 104. As a result, the grease is insufficient on the inner diameter side of the cage 120, so that wear due to long-term use is particularly serious. It occurs between the rotary shaft 101 and the engagement element 122, and the life of the one-way clutch cannot be greatly extended. The present invention has been made to solve the above-described problems. The object of the present invention is to circulate the grease by returning the grease to the inner diameter side by using the rotation of the cage, thereby greatly extending the service life. Provide a one-way clutch.

The invention according to claim 1 is a first rotating portion, a second rotating portion that is rotatably supported about the same axis as the first rotating portion, and is disposed on the outer diameter side with respect to the first rotating portion. A wedge space formed between the first rotating portion and the second rotating portion, the space gradually decreasing in the circumferential direction, and a cylinder interposed in the wedge space and formed with a plurality of pockets in the circumferential direction In a one-way clutch comprising a shape-shaped cage, an engagement member rotatably held in each pocket, and an urging means for urging the engagement member to one side of the wedge space,
In the end face of the cage, a grease circulation groove is formed so as to be penetrated in the radial direction and inclined so that the outer diameter side is located in front of the inner diameter side in the rotation direction of the cage.

  According to this configuration, since the grease on the second rotating part side can be supplied to the first rotating part side by utilizing the rotation of the cage, the grease is reliably circulated and the life of the one-way clutch is greatly extended. .

  According to a second aspect of the present invention, in the one-way clutch according to the first aspect, the groove for circulating the grease has a groove width in the circumferential direction that is wider on the outer diameter side than on the inner diameter side.

  According to this configuration, the grease on the second rotating part side can be easily captured, and the grease can be reliably supplied to the first rotating part side.

  According to the present invention, it is possible to provide a one-way clutch in which the grease is circulated using the rotation of the cage to greatly extend the life.

It is a longitudinal cross-sectional view of the pulley apparatus with a one-way clutch in embodiment of this invention. It is the DD sectional view taken on the line of FIG. 1 in embodiment of this invention. It is the EE sectional view taken on the line of FIG. 1 in embodiment of this invention. It is a longitudinal cross-sectional view of the conventional pulley apparatus with a one-way clutch. It is the sectional view on the AA line of FIG.

  An embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a longitudinal sectional view of a pulley device with a one-way clutch, FIG. 2 is a sectional view taken along the line DD in FIG. 1, and FIG. 3 is a sectional view taken along the line EE in FIG.

  As shown in FIG. 1, the pulley apparatus 50 with a one-way clutch is attached to one end of the generator shaft 13 of the AC generator. The pulley device with a one-way clutch 50 includes a rotating shaft 51 screwed to the power generation shaft 13, a roller bearing 52 and a ball bearing 53 disposed on the outer periphery of the rotating shaft 51, and a roller bearing 52 and a ball bearing 53. A pulley portion 54 rotatably supported by the rotary shaft 51, and is interposed between the roller bearing 52 and the ball bearing 53 in the axial direction and between the rotary shaft 51 and the pulley portion 54 in the radial direction. It consists of a direction clutch 60.

  On the inner periphery of the rotating shaft 51, a screw portion 51a is formed in the middle in the axial direction, and a hexagonal hole 51b is formed at one end. An unillustrated tool such as a hexagon wrench is inserted into the hexagonal hole 51b in order to rotate the rotary shaft 51. A screw portion 13a is formed on the outer periphery of one end of the power generation shaft 13, and the screw portion 51a of the rotary shaft 51 is screwed to the screw portion 13a.

  As shown in FIG. 2, the one-way clutch 60 includes a cage 61 having a plurality of pockets 61a at equal intervals in the circumferential direction, and a cylindrical cylindrical roller that is guided by each pocket 61a so as to be movable in the circumferential direction. 62, and a coil spring 63 disposed between the pocket 61a and the cylindrical roller 62 and biasing the cylindrical roller 62 in one circumferential direction. The pulley portion 54 also serves as an outer ring of the one-way clutch 60, and an outer ring side raceway surface 54a for the clutch on which the cylindrical roller 62 rolls is formed on the inner periphery of the pulley portion 54. The outer ring side raceway surface 54a for clutch is formed in a circular cross section. The rotating shaft 51 also serves as an inner ring of the one-way clutch 60, and the outer periphery of the rotating shaft 51 is for a clutch on which the cylindrical roller 62 rolls at an axial position corresponding to the one-way clutch 60. An inner ring side raceway surface 51c is formed. The clutch inner ring side raceway surface 51c is formed in an octagonal cross section. The clutch outer ring side raceway surface 54a and the clutch inner ring side raceway surface 51c form a wedge space 70 in which the radial space gradually decreases in the circumferential direction.

  The retainer 61 has an outer periphery formed in a circular cross section and an inner periphery formed in an octagonal cross section. The retainer 61 is fitted to the clutch inner ring side raceway surface 51c of the rotary shaft 51 so as not to be relatively movable in the circumferential direction and with a gap of about several tens to several hundreds of microns in the radial direction. The device 61 is loosely fitted to the pulley portion 54 so as to be relatively movable in the circumferential direction.

  In the wedge space 70, the radial space gradually decreases from the position of the cylindrical roller 62 in FIG. 2 in the clockwise direction. In the wedge space 70, the radial space increases from the position of the cylindrical roller 62 in FIG. 2 in the counterclockwise direction, and gradually decreases from the middle.

  When the pulley portion 54 rotates in the clockwise direction in FIG. 2, the cylindrical roller 62 moves in the clockwise direction with respect to the rotating shaft 51, that is, in the direction in which the radial space of the wedge space 70 gradually decreases, and the cylindrical roller 62 The wedge portion 70 is inserted into the wedge space 70, and the clockwise rotation of the pulley portion 54 is transmitted to the rotating shaft 51 through the cylindrical roller 62. When the rotation shaft 51 rotates in the clockwise direction in FIG. 2 while the pulley portion 54 is stopped, the cylindrical roller 62 overcomes the coil spring 63 and counterclockwise with respect to the rotation shaft 51, that is, in the wedge space 70. The radial space moves in a gradually increasing direction so that the rotation of the rotating shaft 51 is not transmitted to the pulley portion 54.

  As shown in FIG. 3, grease circulation grooves 80 are formed in both end surfaces of the retainer 61 so as to penetrate in the radial direction substantially in phase with the cylindrical roller 62. After the pulley portion 54 stops rotating, the rotary shaft 51 and the retainer 61 rotate in the clockwise direction, so that the grease circulation groove 80 is inclined so that the outer diameter side precedes the inner diameter side in the clockwise direction. is doing. The grease circulation groove 80 includes a first inclined groove 81 having substantially the same circumferential width, and a second inclined groove 82 having a circumferential width gradually increasing toward the outer diameter. The second inclined groove 82 has a shape that extends in the clockwise direction toward the outer diameter with respect to the side surface 82b on the side where the side surface 82a on the side preceding the clockwise direction is delayed. The first inclined groove 81 has a shape in which the distance does not change toward the outer diameter with respect to the side surface 81b on the side where the side surface 81a on the side preceding the clockwise direction is delayed. The side surface 81b and the side surface 82b are on an extension line. The delayed side surfaces 81b and 82b have an important role of moving the grease toward the inner diameter side. The grease circulation groove 80 has a groove depth that does not penetrate the pocket 61a.

  As shown in FIG. 1, the roller bearing 52 has a roller 52a and a cage 52b. A roller bearing outer ring side raceway surface 54 b on which the roller 52 a rolls is formed on the inner periphery of the pulley portion 54 at an axial position corresponding to the roller bearing 52. A roller bearing inner ring side raceway surface 51 d on which the roller 52 a rolls is formed on the outer periphery of the rotating shaft 51 at an axial position corresponding to the roller bearing 52.

  The ball bearing 53 includes a ball 53a and a cage 53b. A ball bearing outer ring side raceway surface 54 c on which the ball 53 a rolls is formed on the inner periphery of the pulley portion 54 at an axial position corresponding to the ball bearing 53. A ball bearing inner ring side raceway surface 51e on which the ball 53a rolls is formed on the outer periphery of the rotating shaft 51 at an axial position corresponding to the ball bearing 53.

  As shown in FIG. 1, a first seal portion 71 and a second seal portion 72 are provided between the rotating shaft 51 and the pulley portion 54 on the front side opposite to the AC generator, and the AC power generation is performed. A third seal portion 73 is provided on the rear side on the same side as the machine. The first seal portion 71 is fitted and fixed to the outer periphery of the rotating shaft 51 on the inner peripheral side, and is in sliding contact with the pulley portion 54 on the outer peripheral side. The outer peripheral side of the second seal portion 72 is fitted and fixed to the inner periphery of the pulley portion 54, and the inner peripheral side is in sliding contact with the rotating shaft 51. The outer peripheral side of the third seal portion 73 is fitted and fixed to the inner periphery of the pulley portion 54, and the inner peripheral side is in sliding contact with the rotating shaft 51. Between the second seal part 72 and the third seal part 73 in the axial direction, grease is filled between the pulley part 54 and the rotary shaft 51 in the radial direction. A large number of V grooves 54d having a V-shaped cross section are formed at equal intervals in the axial direction on the outer periphery of the pulley portion 54, and a belt 90 is engaged with the V grooves 54d.

  The roller bearing 52, the ball bearing 53, and the one-way clutch 60 are assembled to the pulley device 50 with a one-way clutch in a state where grease is applied. In particular, the clutch outer ring side raceway surface 54a, the clutch inner ring side raceway surface 51c, the roller bearing outer ring side raceway surface 54b, the roller bearing inner ring side raceway surface 51d, the ball bearing outer ring side raceway surface 54c, Grease is carefully applied to the ball bearing inner ring side raceway surface 51e. This grease does not fall under its own weight when the film thickness is small, but it has a viscosity that only drops when its film thickness is about several millimeters, and it is a liquid that is close to a solid. .

Next, the operation will be described based on the above-described configuration.
As shown in FIG. 1, the rotational power of the automobile engine is transmitted to the power generation shaft 13 via a belt 90, a pulley portion 54, a one-way clutch 60, and a rotating shaft 51. At this time, as shown in FIG. 2, the cylindrical roller 62 of the one-way clutch 60 is caught in the wedge space 70, and the rotary shaft 51 rotates clockwise together with the pulley portion 54.

  When the rotation of the engine stops, the rotation of the pulley portion 54 also stops, and the rotary shaft 51 rotates along with the power generation shaft 13 in a clockwise direction by inertia. At this time, the cylindrical roller 62 overcomes the coil spring 63 and moves in the direction in which the radial space of the wedge space 70 gradually increases, so that clockwise rotation of the rotating shaft 51 relative to the pulley portion 54 is allowed. The same applies to the case where the rotational speed of the engine is reduced and the rotating shaft 51 is rotating with inertia and vigorously with the power generation shaft 13 as compared with the pulley portion 54.

  Due to the clockwise rotation of the rotating shaft 51, the grease moves in the outer diameter direction (arrow F) by centrifugal force and adheres to the outer ring side raceway surface 54a for the clutch. When the rotation of the pulley portion 54 stops and the rotary shaft 51 rotates by inertia, the cylindrical roller 62 rolls on the outer ring side raceway surface 54 a for clutch, and the grease on the outer ring side raceway surface 54 a for clutch is pushed away by the cylindrical roller 62. Thus, the grease moves to both axial sides (arrow G) of the cylindrical roller 62. When the grease moves to a position corresponding to the grease circulation groove 80 and hangs down under its own weight, the grease is captured by the second inclined groove 82 having a wide opening at the grease circulation groove 80 as shown in FIG.

  Since the grease circulation groove 80 is inclined so that the outer diameter side precedes the inner diameter side in the clockwise direction, the grease in the grease circulation groove 80 moves in the inner diameter direction (arrow H) by the rotation of the cage 61. . At this time, since the side surfaces 81b and 82b are inclined so that the outer diameter side precedes the inner diameter side in the clockwise direction, when the side surfaces 81b and 82b are moved clockwise, a force for moving the grease toward the inner diameter side works. . The grease that has moved to the clutch inner ring side raceway surface 51c spreads in the axial direction, passes through a radial gap between the cage 61 and the pulley portion 54, and is supplied between the cylindrical roller 62 and the clutch inner ring side raceway surface 51c. The When the pulley portion 54 rotates vigorously again by the engine, the grease on the clutch inner ring side raceway surface 51c moves in the outer diameter direction (arrow F) by centrifugal force.

  That is, when the pulley portion 54 and the rotating shaft 51 are rotating, the grease moves to the arrow F, and when the pulley portion 54 is stopped and the rotating shaft 51 and the retainer 61 are rotating in inertia, the grease is Move to arrows G and H. By circulating the grease in this way, a shortage of grease on the inner diameter side of the cage 61, particularly a shortage of grease on the inner ring side raceway surface 51c for the clutch can be avoided, and wear due to long-term use can be reduced.

  The present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.

In the embodiment described above, only the second inclined groove 82 on the outer diameter side has a shape that extends in the clockwise direction toward the outer diameter with respect to the side surface 82b on the side where the side surface 82a on the side preceding the clockwise direction is delayed. As another embodiment, the grease circulation groove 80 may have a shape that extends in the clockwise direction toward the outer diameter with respect to the side surfaces 81b and 82b on the delayed side surface 81a and 82a on the side preceding the clockwise direction. In this case, the side surface 81a and the side surface 82a are provided on the same extension line, or the expansion of the side surface 82a is made larger than the expansion of the side surface 81a.
In the above-described embodiment, a gap of about several tens to several hundreds of microns necessary for fitting is provided between the rotary shaft 51 and the cage 61, and the grease on the grease circulation groove 80 side is passed through the gap to the pocket 61a. Flowed to the side. As another embodiment, a grease notch H indicated by a dotted line in FIGS. 1 to 2 may be provided in the inner periphery of the retainer 61 so as to penetrate in the axial direction at a circumferential position corresponding to the pocket 61a. . This notch H for grease has a depth of about several millimeters in the radial direction, and has an advantage that grease with higher viscosity can flow more easily.

51: Rotating shaft (first rotating part), 54: Pulley part (second rotating part), 60: One-way clutch, 61: Cage, 61a: Pocket, 62: Cylindrical roller (engagement element), 62: Coil spring ( Urging means), 70: wedge space, 80: grease circulation groove

Claims (2)

A first rotating portion, a second rotating portion that is rotatably supported about the same axis as the first rotating portion, and is disposed on the outer diameter side with respect to the first rotating portion; the first rotating portion; A wedge space formed between the two rotating portions and gradually reducing the space in the circumferential direction; a cylindrical cage inserted into the wedge space and having a plurality of pockets formed in the circumferential direction; and In a one-way clutch provided with an engaging element rotatably held, and an urging means for urging the engaging element to one side of the wedge space,
A one-way clutch characterized in that a grease circulation groove is formed in an end face of the cage, and is inclined so as to penetrate in a radial direction and an outer diameter side is positioned forward of a rotation direction of the cage with respect to an inner diameter side. 2. The one-way clutch according to claim 1, wherein the grease circulation groove has a groove width in a circumferential direction that is wider on an outer diameter side than on an inner diameter side.

Images