JP2014047902A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make dust hard to be bitten between an engagement surface of a sprag and an outer ring side cylindrical surface or an inner ring side cylindrical surface.SOLUTION: A one-way clutch 10 includes: an outer ring 11 having an outer ring side cylindrical surface 12 on an inner periphery; an inner ring 20 having an inner ring side cylindrical surface 21 on an outer periphery; sprags 60 to be engaged with the outer ring side cylindrical surface 12 and the inner ring side cylindrical surface 21 during one-way relative rotation of the inner ring 20 to the outer ring 11; retainers 30, 40 for tiltably retaining a plurality of sprags 60 with intervals in a circumferential direction; and springs 50 for respectively energizing the sprags 60 in a direction of engagement with the outer ring 11 and the inner ring 20. Dust scrapers 43 arranged between the plurality of sprags 60 in the circumferential direction, arranged across the whole width of the sprags 60 in an axial direction and arranged close to at least one of the outer sing side and the inner ring side in a dimeter direction are attached to the retainers 30, 40.

Description

  The present invention relates to a one-way clutch using a sprag.

  As a one-way clutch using a sprag, there is one shown in Patent Document 1.

  When the inner ring is rotated relative to the outer ring in one direction, the sprag engagement surface tilts in the direction in which the sprag rises by engaging the outer ring side cylindrical surface and the inner ring side cylindrical surface, and between the outer ring and the inner ring. Rotate transmission with. When the inner ring is rotated relative to the outer ring in the other direction, the sprag engagement surface is tilted in the direction in which the sprag is engaged by engaging the outer ring side cylindrical surface and the inner ring side cylindrical surface, and the outer ring and the inner ring rotate relative to each other. Allow. In order to prevent the dust contained in the lubricating oil from being caught, a groove is provided in the sprag.

JP 2006-329222 A

  Since the groove portion and the engaging surface are adjacent to each other, if dust accumulates in the groove portion, the dust is easily caught between the engaging surface of the sprag and the outer ring side cylindrical surface or the inner ring side cylindrical surface. The present invention has been made to solve the above-described problems, and an object of the present invention is to make it difficult for dust to be caught between the engagement surface of the sprag and the outer ring side cylindrical surface or the inner ring side cylindrical surface.

The invention according to claim 1 includes an outer ring having an outer ring side cylindrical surface on the inner periphery, an inner ring having an inner ring side cylindrical surface on the outer periphery, and the outer ring side cylindrical surface during relative rotation of the inner ring with respect to the outer ring in one direction. A sprag that engages with the inner ring-side cylindrical surface, a retainer that holds the plurality of sprags in a circumferentially spaced manner, and a biasing force in a direction that engages the sprag with the outer ring and the inner ring In a one-way clutch consisting of a spring that
A dust scraper disposed between the plurality of sprags in the circumferential direction, disposed over the entire width of the sprag in the axial direction, and disposed adjacent to at least one of the outer ring side and the inner ring side in the radial direction; It is provided in the retainer.

  According to the first aspect of the present invention, it is possible to make it difficult for dust to be caught between the engagement surface of the sprag and the outer ring side cylindrical surface or the inner ring side cylindrical surface.

  According to a second aspect of the present invention, the retainer according to the first aspect of the present invention has a flange portion that extends in the radial direction and extends in the circumferential direction from at least one of the axial ends to the outer ring side and the inner ring side. The dust scraper is characterized in that a gap with respect to at least one of the outer ring side and the inner ring side of the dust scraper is made larger than a gap with respect to at least one of the outer ring side and the inner ring side of the flange portion.

  According to the second aspect of the present invention, it is possible to make it difficult for dust to be caught between the engagement surface of the sprag and the outer ring side cylindrical surface or the inner ring side cylindrical surface. Moreover, since the eccentric restriction of the inner ring with respect to the outer ring is received by the flange, the outer ring side cylindrical surface or the inner ring side cylindrical surface is not damaged by the dust scraper.

  According to the present invention, it is possible to make it difficult for the dust to be caught between the engagement surface of the sprag and the outer ring side cylindrical surface or the inner ring side cylindrical surface.

It is a longitudinal cross-sectional view of the one-way clutch in the 1st Embodiment of this invention. It is the sectional view on the AA line of FIG. 1 in the 1st Embodiment of this invention. It is the BB sectional drawing of FIG. 1 in the 1st Embodiment of this invention. It is an expansion | deployment top view of the spring in the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the one-way clutch in the 2nd Embodiment of this invention. It is CC sectional view taken on the line of FIG. 5 in the 2nd Embodiment of this invention.

  A first embodiment of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view of a one-way clutch, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a sectional view taken along line BB in FIG. 1, and FIG. FIG.

  As shown in FIGS. 1 to 3, the one-way clutch 10 includes an outer ring 11 having an outer ring side cylindrical surface 12 on the inner periphery, an inner ring 20 having an inner ring side cylindrical surface 21 on the outer periphery, and one direction of the inner ring 20 with respect to the outer ring 11. Sprags 60 that engage with the outer ring side cylindrical surface 12 and the inner ring side cylindrical surface 21 at the time of relative rotation, retainers 30 and 40 that hold the plurality of sprags 60 in a circumferentially spaced manner, and the sprags 60. And the spring 50 that urges the sprag 60 in the direction in which the sprag 60 rises. The one-way clutch 10 is applied to support rotation of a stator of a torque converter.

  The outer ring 11 has a ring shape and has a cylindrical outer ring side cylindrical surface 12 on the inner periphery. The inner ring 20 has a ring shape and has a cylindrical inner ring side cylindrical surface 21 on the outer periphery.

  The sprag 60 has a shape constricted from both sides in the circumferential direction of the inner ring 20 in the middle of the radial direction of the inner ring 20 when viewed from the axial direction of the inner ring 20 (FIG. 1). The sprag 60 looks like a square when viewed from the circumferential direction of the inner ring 20 (FIGS. 2 and 3). The sprag 60 has an outer ring side engagement surface 61 on the outer ring 11 side, an inner ring side engagement surface 62 on the inner ring 20 side, and constricted surfaces 63 on both sides in the circumferential direction of the inner ring 20. The outer ring side engagement surface 61 and the inner ring side engagement surface 62 have a surface whose diameter increases clockwise in FIG. 1 and a surface whose diameter decreases.

  The cage includes a ring-shaped outer cage 30 and a ring-shaped inner cage 40 disposed inside the outer cage 30. A plurality of outer pockets 31 are formed in the outer cage 30 at intervals in the circumferential direction. The outer cage 30 is formed with an outer ring side flange 32 bent at one end toward the outer ring 11 side. The outer ring side flange 32 extends in the outer diameter direction and continuously extends in the circumferential direction.

  A plurality of inner pockets 41 are formed in the inner cage 40 at intervals in the circumferential direction. The inner cage 40 is formed with an inner ring side flange 44 that is bent toward the inner ring 20 at one end in the axial direction. The inner ring side flange 44 extends in the inner diameter direction and continuously extends in the circumferential direction. A plurality of notches 42 are formed in the inner cage 40 at intervals in the circumferential direction, and a dust scraper 43 is formed by bending the plate material of the notch 42 portion toward the inner ring 20 side. The dust scraper 43 is disposed between the plurality of sprags 60 in the circumferential direction of the inner ring 20, is disposed over at least the entire width of the sprag 60 in the axial direction, and is disposed close to the inner ring 20 in the radial direction. The dust scraper 43 is a plate material extending in the inner diameter direction and extending in the axial direction. In other words, the dust scraper 43 that is the plate material is disposed at a right angle to the circumferential direction of the inner ring 20.

  The clearance S1 between the inner ring side flange 44 and the inner ring 20 is smaller than the clearance S2 between the dust scraper 43 and the inner ring 20. The gap S1 is about 0.3 mm, and the gap S2 is about 0.4 mm. In this way, when the inner ring 20 is eccentric with respect to the outer ring 11, the inner ring side flange 44 first comes into contact with the inner ring 20 so that the dust scraper 43 does not come into contact with the inner ring side cylindrical surface 21 of the inner ring 20. The dust scraper 43 prevents the inner ring side cylindrical surface 21 from being scratched.

  The spring 50 is arranged in a ring shape between the outer cage 30 and the inner cage 40. The spring 50 has a plate shape as shown in FIG. 4 and is bent in a ring shape. A plurality of middle pockets 53 are formed in the spring 50 at intervals in the circumferential direction. By forming the inner pocket 53, the spring 50 is divided into two annular parts, a pillar part connecting the two annular parts, and a tongue piece 51 extending in the circumferential direction from the middle of the pillar part. . A first bent portion 54 is formed on two annular portions on one column portion side, and a second bent portion 52 is formed on the tongue piece 51 on one column portion side. The first bent portion 54 and the second bent portion 52 are bent in a U shape.

  As shown in FIGS. 1 to 3, the sprag 60 is inserted into the outer pocket 31, the middle pocket 53, and the inner pocket 41. When the tongue piece 51 abuts on the constricted surface 63, the sprag 60 is given an elastic force in the direction in which it rises. In other words, the sprag 60 is given an anticlockwise elastic force in FIG.

Next, the operation will be described based on the above-described configuration.
When the inner ring 20 rotates clockwise in FIG. 1 with respect to the outer ring 11, the inner ring side cylindrical surface 21 engages with the inner ring side engaging surface 62, and the outer ring side cylindrical surface 12 engages with the outer ring side engaging surface 61. The sprag 60 tilts in the direction in which it rises, and the rotation of the inner ring 20 is transmitted to the outer ring 11. When the inner ring 20 rotates counterclockwise with respect to the outer ring 11, the inner ring side cylindrical surface 21 engages with the inner ring side engaging surface 62, and the outer ring side cylindrical surface 12 engages with the outer ring side engaging surface 61. However, the sprag 60 tilts in the direction in which it falls, and the rotation of the inner ring 20 is not transmitted to the outer ring 11.

  Even if the inner ring 20 rotates clockwise or counterclockwise in FIG. 1 with respect to the outer ring 11, the dust 80 is captured by the dust scraper 43. Since the dust scraper 43 extends in the radial direction of the inner ring 20, a large amount of dust 80 can be accumulated. Since the dust scraper 43 is located at a position away from the sprag 60 in the circumferential direction, the dust 80 is separated from the dust scraper 43 by the tilt of the sprag 60, and the inner ring side engagement surface 62 and the inner ring side cylinder of the sprag 60 are separated. There is no fear that the dust 80 may be caught between the surfaces 21.

  A second embodiment of the present invention will be described with reference to FIGS. 5 is a longitudinal sectional view of the one-way clutch, and FIG. 6 is a sectional view taken along the line CC of FIG.

  As shown in FIGS. 5 and 6, the one-way clutch 10 includes an outer ring 11 having an outer ring side cylindrical surface 12 on the inner periphery, an inner ring 20 having an inner ring side cylindrical surface 21 on the outer periphery, and one direction of the inner ring 20 with respect to the outer ring 11. Sprags 60 that engage with the outer ring side cylindrical surface 12 and the inner ring side cylindrical surface 21 at the time of relative rotation, retainers 30 and 40 that hold the plurality of sprags 60 in a circumferentially spaced manner, and the sprags 60. And a spring 50 that urges the outer ring 11 and the inner ring 20 in a direction of engagement. In this respect, the one-way clutch 10 of the second embodiment has the same configuration as the one-way clutch 10 of the first embodiment. Since the outer ring 11, the inner ring 20, the sprag 60, and the spring 50 have the same configuration as that of the first embodiment, the same numbers are assigned and the description is omitted. Since the cage is partly different from that of the first embodiment, it will be described in detail.

  The cage includes a ring-shaped outer cage 30 and a ring-shaped inner cage 40 disposed inside the outer cage 30. About the outer side holder | retainer 30, since it has the same structure as 1st Embodiment, the same number is attached | subjected and description is omitted. Only the inner cage 40 has a different configuration from the inner cage 40 of the first embodiment, and will be described in detail.

  A plurality of inner pockets 41 are formed in the inner cage 40 at intervals in the circumferential direction. The inner cage 40 is formed with an inner ring side flange 44 that is bent toward the inner ring 20 at one end in the axial direction. The inner ring side flange 44 extends in the inner diameter direction and continuously extends in the circumferential direction. A dust scraper 48 is fixed to the inner ring side flange 44 with a weld 49. The dust scraper 48 is disposed between the plurality of sprags 60 in the circumferential direction, is disposed over at least the entire width of the sprag in the axial direction, and is disposed close to the inner ring 20 in the radial direction. The dust scraper 48 is a rod having a square cross section.

  The clearance S1 between the inner ring side flange 44 and the inner ring 20 is smaller than the clearance S2 between the dust scraper 48 and the inner ring 20. The gap S1 is about 0.3 mm, and the gap S2 is about 0.4 mm. In this way, when the inner ring 20 is eccentric with respect to the outer ring 11, the inner ring side flange 44 first comes into contact with the inner ring 20 so that the dust scraper 48 does not come into contact with the inner ring side cylindrical surface 21 of the inner ring 20. The dust scraper 48 prevents the inner ring side cylindrical surface 21 from being scratched. Alternatively, the dust scraper 48 is prevented from being broken at the welded portion 49.

  Even if the inner ring 20 rotates clockwise or counterclockwise in FIG. 5 with respect to the outer ring 11, the dust 80 is captured by the dust scraper 48. Since the dust scraper 48 is located at a position away from the sprag 60 in the circumferential direction, the dust 80 is separated from the dust scraper 43 by the tilt of the sprag 60, and the inner ring side engagement surface 62 and the inner ring side cylinder of the sprag 60. There is no fear that the dust 80 may be caught between the surfaces 21.

  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, a plurality of notches 42 are formed in the inner cage 40 at intervals in the circumferential direction, and the dust scraper 43 is formed by bending the plate material of the notch 42 portion toward the inner ring 20 side. . As another embodiment, a plurality of notches may be formed in the outer cage 30 at intervals in the circumferential direction, and the dust scraper may be formed by bending the notched portion of the plate material toward the outer ring 11 side.

  In the embodiment described above, the inner cage 40, the spring 50, and the outer cage 30 are arranged in order from the inner diameter side. As another embodiment, a spring and a cage may be arranged in order from the inner diameter side. In this case, a plurality of notches are formed in the cage at intervals in the circumferential direction, and a dust scraper is formed by folding the notch plate material toward the inner ring 20 side.

  In the embodiment described above, the inner cage 40, the spring 50, and the outer cage 30 are arranged in order from the inner diameter side. As another embodiment, a spring and a cage may be arranged in order from the inner diameter side. In this case, a plurality of notches are formed in the cage at intervals in the circumferential direction, and a dust scraper is formed by bending the plate material at the notches to the outer ring 11 side.

  10: one-way clutch, 11: outer ring, 12: outer ring side cylindrical surface, 20: inner ring, 21: inner ring side cylindrical surface, 30: outer cage (cage), 40: inner cage (cage), 43: Scraper for dust, 44: Inner ring side flange (buttock), 50: Spring, 60: Splug

Claims (2)

An outer ring having an outer ring side cylindrical surface on the inner periphery, an inner ring having an inner ring side cylindrical surface on the outer periphery, and engaging with the outer ring side cylindrical surface and the inner ring side cylindrical surface during one-way relative rotation of the inner ring with respect to the outer ring In a one-way clutch comprising a sprag, a cage that holds the plurality of sprags in a circumferentially spaced manner, and a spring that biases the sprag in a direction to engage the outer ring and the inner ring ,
A dust scraper disposed between the plurality of sprags in the circumferential direction, disposed over the entire width of the sprag in the axial direction, and disposed adjacent to at least one of the outer ring side and the inner ring side in the radial direction; A one-way clutch provided in the cage. The retainer has a flange extending radially and circumferentially from at least one of the outer ring side and the inner ring side from one end in the axial direction, and is provided on the outer ring side and the inner ring side of the dust scraper. 2. The one-way clutch according to claim 1, wherein a clearance with respect to at least one is made larger than a clearance with respect to at least one of the flange portion on the outer ring side and the inner ring side.

Images