JP2009299862A - One-way clutch, and torque converter stator unit incorporating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-way clutch for smoothing the tilting motion of sprags. <P>SOLUTION: The one-way clutch 20 includes the plurality of sprags 23 arranged between an outer ring 21 and an inner ring 22, and garter springs 25 for energizing the sprags 23 in the engaging direction. The sprags 23 are held at equal spaces along the peripheral direction by a cage 40 which has a cylindrical peripheral wall 43 and a sidewall 42 extending from one axial edge of the peripheral wall 43 in the direction of the inner diameter. The garter springs 25 contact with an axial inside face 42d of the sidewall 42. The sprags 23 are held at equal spaces along the peripheral direction of the one-way clutch by the cage 40, and the garter springs 25 are stably supported between the sidewall 42 of the cage 40 and the end face of each sprag 23. Thus, lengths of the garter springs 25 bridged between the peripherally adjacent sprags 23 are kept equal between the sprags 23 to stabilize the tilting motion and engaging attitudes of the sprags 23. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a one-way clutch that switches between transmission and cut-off of power on a power transmission path, and a torque converter stator unit incorporating the one-way clutch.

  A one-way clutch that uses a sprag as an engagement element is used as a one-way clutch that switches between transmission and interruption of power on a power transmission path. As this kind of sprag type one-way clutch, for example, the one shown in Patent Document 1 is known.

  In this one-way clutch, a plurality of sprags are arranged between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring arranged coaxially, and the sprags are arranged on the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. And a garter spring that is biased in the engaging direction.

  The garter spring is biased by the elastic force in a direction in which the sprags engage with the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. In addition, the garter spring gives each sprag a contact force against the inner peripheral surface of the outer ring, and holds each sprag from falling off by pressing each sprag in the axial direction of the one-way clutch. (For example, refer to Patent Document 1).

Of these inner and outer rings, one is the drive side and the other is the driven side, and if the rotational speed on the drive side is faster than the driven side, power is transmitted and the direction of rotation on the drive side is reversed, When the rotational speed becomes faster than the driving side, the transmission of power is interrupted (see, for example, Patent Document 1).
JP 2006-207797 A

A sprag type one-way clutch is used, for example, in a stator of a torque converter.
In the torque converter, for example, as shown in FIG. 5, an impeller 11 connected to an output shaft of an engine and a turbine 13 connected to an input shaft of a transmission are arranged opposite to each other, and are unidirectionally connected to a stator shaft fixed to a casing. The stator 12 is attached via the clutch 20.

  The stator 12 changes the flow direction of the fluid when returning the fluid recirculated between the impeller blade 11b and the turbine blade 13b each formed in a bowl shape from the turbine 13 side to the impeller side at a position on the inner diameter side thereof. In other words, the forward torque is applied to the impeller 11 to amplify the transmission torque.

  The one-way clutch 20 is arranged along an annular space between an inner ring 22 coupled to the inner diameter portion (stator hub) 12a of the stator 12 and an inner ring 22 coupled to the stator shaft, and both inner and outer wheels 21 and 22. A plurality of sprags 23 and an annular cage 24 that holds the sprags 23 are arranged, and the one-way clutch 20 allows the stator 12 to rotate only in one direction with respect to the stator shaft.

  The outer ring 21 is heat-treated in advance, and the outer ring 21 and the cage 24 are respectively supported at one end in the axial direction by the end wall 12b of the inner diameter portion 12a, and the axial direction of the outer ring 21 and the cage 24 The other end is pressed from the outside by the presser plate 14. The outer ring 21 and the cage 24 are sandwiched between the end wall 12b and the holding plate 14 and supported by the inner diameter portion 12a.

  Further, thrust bearings 1 a and 1 b are assembled between the stator 12 and the impeller 11 and between the stator 12 and the turbine 13 to support an axial load applied to the stator 12. The thrust bearings 1a and 1b include rolling wheels 4a and 4b, rolling rollers 5a and 5b provided radially on the rolling wheels 4a and 4b, and rolling wheels 4a and 4b, respectively 5a and 5b. And the like.

A stator unit including the stator 12, the one-way clutch 20, and the thrust bearings 1a and 1b is incorporated in a torque converter together with the impeller 11, the turbine 13, and the like (see, for example, Patent Document 2). As a torque converter stator unit, for example, there is one shown in FIG. 6 (see, for example, Patent Document 3).
JP 2003-343690 A JP 2007-255497 A

  In this type of one-way clutch, the sprag repeatedly changes its posture (tilt) with engagement and disengagement with the inner and outer rings. As a general problem required for a sprag type one-way clutch, it is desirable that the sprag tilt as smoothly as possible.

  If the inclination of the sprag is not smooth, the engagement force between the inner and outer rings may not be constant along the circumferential direction. For example, the sprag is in a skewed state (the axial direction of the sprag is in the axial direction of the inner and outer rings). This is because the sprag may be caught between the inner and outer rings.

  Therefore, an object of the present invention is to make the tilting of the sprags smooth.

  In order to solve the above problems, the present invention provides a plurality of sprags disposed between an inner peripheral surface of an outer ring and an outer peripheral surface of the inner ring, and the sprags including the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. In the one-way clutch provided with a garter spring biased in a direction to be engaged with the sprag, the sprag is formed by a cage having a cylindrical peripheral wall and a side wall extending in the inner diameter direction from one axial edge of the peripheral wall. The garter spring is held at equal intervals along the circumferential direction, and the garter spring is in contact with the axially inner side surface of the side wall.

The sprags are maintained at regular intervals along the circumferential direction of the one-way clutch by the cage, and the garter spring is stably supported between the end surface of the sprags against the inner surface of the side wall of the cage. For this reason, it becomes easy to maintain the length of the garter spring spanned between the sprags adjacent in the circumferential direction evenly between the sprags.
Therefore, the urging force against the sprags by the garter spring easily acts on each sprag evenly, and the tilting operation and the posture at the time of engagement can be stabilized.

  The side walls of the cage need only be provided within a range where the garter spring can come into contact with the inner surface of the cage, but it is desirable that the side wall of the cage enter the inner diameter side from the center of the garter spring.

  Here, the garter spring is formed by connecting ends of coil springs having a predetermined length along the axial direction into an annular shape, and arranging the annular coil spring along the circumferential direction of the one-way clutch. It is. The center of the garter spring refers to the axis of the annular coil spring.

  If the garter spring is supported so as to be sandwiched between the cage and the sprag end face, it can contribute to preventing the garter spring from being loosened (the sprag falling off due to the separation of the garter spring).

  If a concave portion into which the garter spring is fitted is formed on one end face in the axial direction of each sprag, the radial position of the garter spring with respect to the one-way clutch is stabilized. For this reason, the operation of tilting each sprag and the posture at the time of engagement can be further stabilized.

  Further, in order to further stabilize the tilting operation and the posture at the time of engagement of each sprag, a convex portion is formed on the other end surface in the axial direction of each sprag, and the convex portion is formed on the inner peripheral surface of the outer ring or the It is possible to employ a configuration in which the inner surface of the inner ring abuts on the inner surface of the side wall rising in the radial direction.

  As a method for holding sprags by a cage, for example, each sprag is held at equal intervals along the circumferential direction by fitting into the pocket portion that penetrates the peripheral wall from the inner diameter side to the outer diameter side. can do.

Thus, in the case where the sprag is held by the pocket portion penetrating the peripheral wall, the pocket portion is formed longer in the axial direction than the outer diameter side cam surface of the sprag, and on the other axial side of the pocket portion. An end edge can be set as the structure located in the axial direction one side rather than the front-end | tip of the said convex part of the said sprag.
In this way, the convex portion is positioned on the outer side in the axial direction than the edge of the pocket portion, and the sprag is unlikely to fall off from the pocket portion. For this reason, workability is improved when the one-way clutch is assembled and transported.

  Moreover, the escape part for preventing that the said convex part interferes can be formed in the edge of the axial direction other side of the said pocket part.

If there is a convex part at the axial end of the sprag, depending on the shape, position and size of the convex part, the direction of the convex part may change when the sprag is tilted and the convex part may hit the cage. Is done.
In particular, when the pocket portion penetrating the peripheral wall is adopted, the convex portion easily hits the inner diameter surface of the peripheral wall and the other end in the axial direction of the pocket portion (edge on the same side as the convex portion) by tilting the scrag. By providing such an escape portion, it is possible to prevent the convex portion from interfering with the cage. Preventing the interference of the convex portions is effective in stabilizing the tilting of the sprags.

  In addition, as a form of the escape portion, for example, when a concave portion that is recessed toward the outside in the axial direction is provided in a part of the other end edge in the axial direction of the pocket portion, and when the sprag is tilted by the interposition of the concave portion, It is possible to prevent the convex portion from hitting the cage. Further, if the concave portion is provided closer to the circumferential end portion of the other end edge in the axial direction of the pocket portion, it is effective to prevent interference with the convex portion of the sprag.

In addition, a flat portion having a flat surface facing the inner diameter side is formed in the concave portion of the sprag, and the garter spring is configured to push out each sprag to the outer diameter side through the flat surface of the flat portion. Can do.
If the contact surface of the garter spring is flat, when the sprag moves in the radial direction of the one-way clutch, the change in the contact angle with the sprag is reduced, and a stable biasing force can be applied from the garter spring to the sprag. It becomes.

  Further, a press-fitting protrusion that protrudes from the peripheral wall to the outer diameter side is formed on an end edge on the other axial side of the retainer, and the outer edge of the press-fitting protrusion is press-fitted into the outer ring. It is possible to adopt a configuration in which and are fixed. In this way, the cage can be made to follow the movement of the outer ring, and the responsiveness of the one-way clutch can be improved.

  In addition, this press-fitting protrusion may be provided continuously over the entire circumference along the circumferential direction, or may be provided intermittently along the circumferential direction. Moreover, you may employ | adopt what the outer edge of a press-fit protrusion is elliptical shape.

Moreover, the following structure is employable as a stator unit for torque converters incorporating the one-way clutch which consists of each of these structures.
That is, the stator disposed between the impeller of the torque converter and the turbine, the one-way clutch disposed between the stator and the stator shaft, and the stator, the impeller, and the turbine, respectively. The one-way clutch includes an outer ring rotating integrally with the stator, an inner ring fixed integrally with the stator shaft, and an inner peripheral surface of the outer ring and an outer peripheral surface of the inner ring. A sprag that is detachably disposed; and a garter spring that biases the sprag in the engaging direction, the sprag comprising a cylindrical peripheral wall and a side wall extending in the inner diameter direction from one axial edge of the peripheral wall The garter spring is in contact with the inner side surface in the axial direction of the side wall. It is a configuration of a torque converter stator unit according to symptoms.

  In this invention, sprags are held at equal intervals along the circumferential direction by a cage having a circumferential wall and a side wall extending in the inner diameter direction from one axial edge of the circumferential wall, and the garter spring is axially arranged on the side wall of the cage. Since it is configured to be in contact with the inner surface, the sprag can be tilted smoothly.

  An embodiment of the present invention will be described with reference to the drawings. This embodiment is a torque converter stator unit 10 used by being incorporated between an impeller 11 of a torque converter and a turbine 13. Since the basic configuration of the torque converter to be incorporated is the same as that of the conventional example shown in FIG. 5 and the like, for example, the configuration of the torque converter stator unit 10 will be described below.

  As shown in FIGS. 1A and 1B, the torque converter stator unit 10 includes a stator 12 having an annular inner diameter portion (stator hub) 12a, a stator 12 and a stator shaft (not shown). The one-way clutch 20 disposed between the stator hub 12a and the impeller hub 11a provided on the inner diameter portion of the impeller 11, and between the stator hub 12a and the turbine hub 13a provided on the inner diameter portion of the turbine 13, respectively. Thrust bearings 1a and 1b are provided.

  The one-way clutch 20 includes an outer ring 21 that is rotatably fixed together with the stator hub 12a, an inner ring 22 that can be fixed to the outer periphery of the stator shaft by spline coupling, and an equal interval along an annular space between the outer ring 21 and the inner ring 22. A plurality of sprags 23, a retainer 40 that holds the sprags 23 at regular intervals along the circumferential direction of the one-way clutch 20, and a direction in which the outer ring 21 and the inner ring 22 are engaged with each sprag 23. It is comprised by the garter spring 25 which urges | biases to.

  The thrust bearings 1a and 1b are arranged on both sides in the axial direction of the stator hub 12a, and each has a disc-shaped rolling wheel 4a and 4b having a shaft insertion hole at the center, and the rolling wheels 4a and 4b. A plurality of rollers 5a and 5b that are radially arranged on the outer surface in the axial direction of the rollers 5a and 5b and are supported by the rolling wheels 4a and 4b so as to be capable of rolling, and retainers 6a and 6b that hold the rollers 5a and 5b. Yes.

The stator hub 12a is provided with locking portions 12c and 12d on the left side (one axial side) and the right side (the other axial side) shown in FIG.
The rolling wheels 4a and 4b of the thrust bearings 1a and 1b are press-fitted and fixed to the locking portions 12c and 12d, respectively.

  Each thrust bearing 1a, 1b has its rolling wheels 4a, 4b press-fitted or inserted into the respective locking portions 12c, 12d from the outside in the axial direction to the inside, and the outer peripheral surface of each rolling wheel 4a, 4b. However, it closely adheres to the inner peripheral surfaces of the locking portions 12c and 12d.

Further, outer rolling wheels 3a and 3b facing the rolling wheels 4a and 4b are provided outside the rolling wheels 4a and 4b in the axial direction with the cages 6a and 6b and the rollers 5a and 5b interposed therebetween. Yes.
Inward claws 7a and 7b provided on the inner diameter side of the outer rolling wheels 3a and 3b lock the inner peripheral edges of the cages 6a and 6b from the inner side in the axial direction. For this reason, the rolling wheels 4a and 4b and the corresponding outer rolling wheels 3a and 3b are held via the cages 6a and 6b so as not to be separated.

  The rolling wheel 4a on the one side in the axial direction (one rolling wheel 4a) is a metal stamped product, like the rolling wheel 4b on the other side in the axial direction (the other rolling wheel 4b). In addition, one of the rolling wheels 4 a is formed longer in the radial direction than the other rolling wheel 4 b to constitute the inner and outer ring support plate 30.

That is, as shown in FIG. 1B, one of the rolling wheels 4a has its outer diameter portion 32 bent in the axially outer side, and the bent portion becomes a locking portion 12c of the stator hub 12a. It is press-fitted and fixed.
Further, the outer ring abutment portion 31 slightly closer to the inner diameter than the outer diameter portion 32 is in surface contact with the axial end surface 21 c of the outer ring 21. Further, the inner diameter portion 35 is in surface contact with the axial end surface 22 c of the inner ring 22. When the outer ring 21 and the inner ring 22 rotate relative to each other, the contact surface between the one rolling wheel 4a and the axial end surface 22c of the inner ring 22 is in sliding contact.

  As shown in FIG. 1, the one rolling wheel 4 a is formed with a protrusion 33 that enters between the inner peripheral surface 21 a of the outer ring 21 and the outer peripheral surface 22 a of the inner ring 22.

  As shown in FIG. 1B, the protrusion 33 has an inner diameter surface 33 b and an outer diameter surface 33 a around the axis of the one-way clutch 20, and the inner diameter surface 33 b of the protrusion 33 is the inner ring 22. The outer ring surface 22a and the outer diameter surface 33a of the projection 33 are in contact with the inner circumferential surface 21a of the outer ring 21, so that the inner ring 22 and the outer ring 21 are integrally supported before being assembled into the stator 12. Is done.

In this way, one rolling wheel 4a is used as the inner / outer ring support plate 30, and the inner / outer ring support plate 30 allows the outer ring 21 and the inner ring 22 to be pressed from one side in the axial direction to the other side in the stator hub 12a. Fixed.
At this time, since the outer ring 21 and the inner ring 22 are integrally supported by the inner / outer ring support plate 30, the incorporation thereof is easy.

  As a result of this incorporation, the outer ring 21 rotates together with the stator 12 together with the rolling wheels 4a and 4b of the thrust bearings 1a and 1b.

  In addition, the inner ring 22 has axially opposite end surfaces on the locking step portion 12e provided on the end wall 12b of the stator hub 12a, and the inner diameter surface 33b and inner diameter portion of the protrusion 33 of the one rolling wheel 4a, respectively. 35 is slidably in close contact with the axial end surface, and is held so as not to be separated from the stator hub 12a so as to be pressed from both sides in the axial direction.

  Further, the protrusion 33 is provided with an oil hole 34 penetrating the one rolling wheel 4a in the axial direction. By supplying the lubricating oil through the oil hole 34, it is possible to supply oil to the one-way clutch 20 and to secure an oil passage between the stator, the shaft, and the turbine.

  As shown in FIG. 2, the retainer 40 has a peripheral wall 43 that extends over the entire circumference, and a side wall 42 that extends in the inner diameter direction from the left side (one axial side) edge of the peripheral wall 43 shown in FIG. ing. The peripheral wall 43 is formed with pocket portions 41 penetrating the peripheral wall 43 in the radial direction at regular intervals along the peripheral direction. As shown in FIG. 4A, the pocket portion 41 has a rectangular shape in plan view.

  The protrusion 33 has an end surface 33c orthogonal to the axial direction of the one-way clutch 20, and the axially outer surface 42c of the side wall 42 is in surface contact with the end surface 33c of the protrusion 33. Is positioned stably in the axial direction.

Further, the sprags 23 are held at equal intervals along the circumferential direction of the one-way clutch 20 by entering the pocket portion 41 of the cage 40.
Since each sprag 23 is accommodated in the pocket portion 41 so as to be tiltable, it can be engaged and disengaged between the inner peripheral surface 21 a of the outer ring 21 and the outer peripheral surface 22 a of the inner ring 22.

  That is, as shown in FIG. 4B, the sprag 23 is formed with inner and outer cam surfaces 23d and 23u that are in contact with the outer ring 21 and the inner ring 22, respectively. When the sprag 23 rotates around the axis and changes its posture (tilts), it engages and disengages (disengages) between the inner peripheral surface 21a of the outer ring 21 and the outer peripheral surface 22a of the inner ring 22. Then, the engagement / disengagement of the torque between the outer ring 21 and the inner ring 22 is performed.

  At this time, the garter spring 25 is housed in a state of being in contact with the axially inner side surface 42 d of the side wall 42. Since the side wall 42 enters the inner diameter side of the center of the garter spring 25, the garter spring 25 is always in contact with the side wall 42 over the entire circumference.

An arcuate recess 23a into which the garter spring 25 is fitted is formed on one axial end surface of each sprag 23.
As shown in FIG. 4A, the recess 23a is provided along the end face of each sprag 23 over the entire length of the end face. For this reason, the garter spring 25 enters the recess 23a smoothly without being bent.

  Since the sprags 23 are maintained at equal intervals along the circumferential direction of the one-way clutch 20 by the cage 40 and the garter spring 25 hits the axially inner side surface 42d of the side wall 42 of the cage 40, the garter spring 25 Is stably supported between the end face of the sprag 23 and the retainer 40.

For this reason, the length of the garter spring 25 spanned between the sprags 23 adjacent to each other in the circumferential direction is easily maintained evenly between the sprags 23 23.
Therefore, the urging force of each sprag 23 by the garter spring 25 easily acts on each sprag 23 evenly, and the tilting operation and the posture at the time of engagement can be stabilized.

Further, by forming the recess 23a on one end face in the axial direction of the sprag 23, the radial position of the garter spring 25 with respect to the one-way clutch 20 can be stabilized.
For this reason, the operation of tilting each sprag 23 and the posture at the time of engagement can be further stabilized.

Further, a convex portion 23b whose outer surface is an arc-shaped column surface is formed on the other axial end surface of each sprag 23. As shown in FIG. 4A, the convex portion 23b is provided along the end surface of each sprag 23 over the entire length of the end surface. For this reason, when the front-end | tip of the convex part 23b hits the end wall 12b inner surface of the stator 12, it can come in line contact.
In addition, although the circular arc surface of this convex part 23b may be a column surface like this embodiment, you may make point contact as a spherical surface.

  Further, the axial width L2 of the pocket portion 41 is formed to be longer than the axial width L1 of the outer diameter side cam surface 23u of the sprag 23. That is, in the relationship between the distance L1 and the distance L2 shown in FIG. 4B, L1 <L2.

  Further, as shown in FIG. 4B, the edge of the pocket portion 41 on the other side in the axial direction is positioned on the one side in the axial direction by a distance L3 from the tip of the convex portion 23b of the sprag 23. . For this reason, the tip of the convex portion 23 b is positioned axially outside the edge of the pocket portion 41 by a distance L 3, and the sprag 23 is less likely to drop off from the pocket portion 41.

  Further, a concave relief portion 44 for preventing the convex portion 23b from interfering is formed at the edge on the other axial side of the pocket portion 41.

  The escape portion 44 is provided near the end in the circumferential direction (upward as shown in FIG. 4A) among the edges on the other axial side of the pocket portion 41. Since the edge of the pocket portion 41 is expanded outward in the axial direction by the escape portion 44, when the sprag 23 tilts and shifts to the engaged state, the convex portion 23b enters the escape portion 44, and the pocket portion The effect that it does not hit the peripheral edge of 41 (does not interfere) can be expected.

The escape portion 44 of this embodiment prevents interference between the convex portion 23b and the retainer 40 when the sprag 23 is tilted to the engagement side. The escape portion 44 is provided on the opposite side in the circumferential direction. By providing it near the end (lower side shown in FIG. 4A), it is possible to prevent the protrusion 23b and the retainer 40 from interfering with each other when the sprag 23 is tilted to the idling side.
As described above, the escape portion 44 may exhibit an interference preventing effect on either the engagement side or the idling side, and may be provided on either the engagement side or the idling side. It may be provided on both the idle side and the idle side.

Further, in the recess 23a of the sprag 23, a flat portion 23f having a flat surface facing the inner diameter side is formed. The garter spring 25 pushes the sprags 23 to the outer diameter side through the flat surface of the flat portion 23f.
If the contact surface of the garter spring 25 is a flat surface, when the sprag 23 moves in the radial direction of the one-way clutch 20, the change in the contact angle with the sprag 23 is reduced, and the stability from the garter spring 25 to the sprag 23 is stabilized. The given urging force can be given.

In addition, a press-fit protrusion 45 that protrudes from the peripheral wall 43 to the outer diameter side is formed on the other end edge in the axial direction of the cage 40. The outer ring 21 and the retainer 40 are fixed by being press-fitted so that the outer edge of the press-fitting protrusion 45 is in contact with the inner peripheral surface 21 a of the outer ring 21.
For this reason, the retainer 40 can be made to follow the movement of the outer ring 21, and the responsiveness of the one-way clutch 20 can be improved.

  In this embodiment, as shown in FIG. 3B, the press-fit protrusion 45 is continuously provided over the entire circumference along the circumferential direction. However, the press-fit protrusion 45 is formed in the circumferential direction. You may provide intermittently along. Further, the outer edge of the press-fitting protrusion 45 may be circular or elliptical.

  In this embodiment, the configuration of the one-way clutch 20 of the present invention has been described by taking a torque converter stator unit as an example. However, not only this embodiment but also, for example, a pulley device used for an auxiliary machine of an automobile, etc. The one-way clutch 20 of the present invention can also be employed in various devices for the above applications.

Front sectional view of one embodiment Enlarged view of the main part of FIG. The detail of the one way clutch integrated in the embodiment is shown, (a) is a side view, (b) is a bb sectional view of (a). The detail of the one way clutch integrated in the embodiment is shown, (a) is aa sectional view of (b), (b) is a front view (A) is a principal part enlarged view of FIG.3 (b), (b) is a principal part enlarged view of FIG.2 (b). Front view showing a conventional torque converter Front view showing a conventional torque converter stator unit

Explanation of symbols

1a, 1b Thrust bearings 3a, 3b Outer rolling wheels 4a, 4b Rolling wheels 5a, 5b Rollers 6a, 6b Cage 10 Torque converter stator unit 11 Impeller 11a Impeller hub 11b Impeller blade 12 Stator 12a Inner diameter portion (stator hub)
12b End wall 13 Turbine 13a Turbine hub 13b Turbine blade 14 Holding plate 20 One-way clutch 21 Outer ring 22 Inner ring 23 Sprag 23a Recessed part 23b Projected part 23f Flat part 23d Inner diameter side cam surface 23u Outer diameter side cam surface 24, 40 Cage 25 Garter Spring (elastic member)
30 Rolling wheel (inner / outer ring support plate)
31 Outer ring contact portion 32 Outer diameter portion 33 Projection portion 33a Outer diameter surface 33b Inner diameter surface 33c End surface 34 Oil hole 35 Inner diameter portion 41 Pocket portion 42 Side wall 42c Axial outer side surface 42d Axial inner side surface 43 Peripheral wall 44 Escape portion 45 Press-fit projection

Claims (12)

A plurality of sprags (23) disposed between the inner peripheral surface of the outer ring (21) and the outer peripheral surface of the inner ring (22), and the sprags (23) are connected to the inner peripheral surface of the outer ring (21) and the inner ring ( 22) a one-way clutch (20) provided with a garter spring (25) biased in a direction to engage with the outer peripheral surface of
The sprag (23) is arranged along the circumferential direction by a cage (40) having a cylindrical peripheral wall (43) and a side wall (42) extending in the inner diameter direction from one axial edge of the peripheral wall (43). The one-way clutch, which is held at a distance, and that the garter spring (25) is in contact with the axially inner side surface (42d) of the side wall (42).   2. The one-way clutch according to claim 1, wherein the side wall (42) enters an inner diameter side of a center of the garter spring (25).   The one-way clutch according to claim 1 or 2, wherein a concave portion (23a) into which the garter spring (25) is fitted is formed on one end face in the axial direction of each sprag (23).   A convex portion (23b) is formed on the other end surface in the axial direction of each sprag (23), and the convex portion (23b) has a diameter from the inner peripheral surface of the outer ring (21) or the outer peripheral surface of the inner ring (22). The one-way clutch according to any one of claims 1 to 4, wherein the one-way clutch is in contact with an inner surface of a side wall (12b) rising in a direction.   The sprags (23) are held at equal intervals along the circumferential direction by fitting into pocket portions (41) that penetrate the peripheral wall (43) from the inner diameter side to the outer diameter side, and the pocket portions (41) are The sprag (23) is longer than the outer diameter side cam surface (23u) in the axial direction, and the other edge in the axial direction of the pocket portion (41) is the convex portion of the sprag (23). The one-way clutch according to claim 4, wherein the one-way clutch is located on one side in the axial direction from the tip of (23 b).   6. The escape portion (44) for preventing the convex portion (23 b) from interfering with the edge on the other axial side of the pocket portion (41). Direction clutch.   A flat portion (23f) having a flat surface facing the inner diameter side is formed in the concave portion (23a) of the sprag (23), and the garter spring (25) passes through the flat surface of the flat portion (23f). The one-way clutch according to any one of claims 3 to 6, wherein each of the sprags (23) is pushed outward.   A press-fit projection (45) projecting from the peripheral wall (43) to the outer diameter side is formed on an end edge on the other axial side of the cage (40), and an outer edge of the press-fit projection (45) is an outer ring (21). The one-way clutch according to any one of claims 1 to 7, wherein the outer ring (21) and the cage (40) are fixed by being press-fitted into the inside.   The one-way clutch according to claim 8, wherein the press-fitting protrusion (45) is provided continuously over the entire circumference along the circumferential direction.   The one-way clutch according to claim 8, wherein the press-fitting protrusion (45) is provided intermittently along a circumferential direction.   The one-way clutch according to any one of claims 8 to 10, wherein an outer edge of the press-fitting protrusion (45) has an elliptical shape.   A stator unit for a torque converter incorporating the one-way clutch (20) according to any one of claims 1 to 11, wherein the stator is disposed between an impeller (11) of the torque converter and a turbine (13). 12), the one-way clutch (20) disposed between the stator (12) and the stator shaft, and the stator (12), the impeller (11), and the turbine (13), respectively. The one-way clutch (20) includes an outer ring (21) that rotates integrally with the stator (12), and an inner ring (22) that is fixed integrally with the stator shaft. A sprag (23) removably disposed between an inner peripheral surface of the outer ring (21) and an outer peripheral surface of the inner ring (22), and the sprag (23). The sprag (23) includes a cylindrical peripheral wall (43) and a side wall (42) extending in the inner diameter direction from one axial edge of the peripheral wall (43). The garter spring (25) is in contact with the axial inner side surface (42d) of the side wall (42). Converter stator unit.

Images