JP4318343B2 - One-way clutch assembly for stator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stator one-way clutch assembly used in a torque converter of an automatic transmission.
[0002]
[Prior art]
FIG. 3 is a cross-sectional view of the torque converter C of the automatic transmission.
This torque converter C includes three impellers of a pump impeller P, a turbine runner T, and a stator S.
As shown in FIG. 3, the stator S of the torque converter C is assembled to the stator shaft via the one-way clutch assembly 10.
[0003]
4 is a sectional view of a conventional stator one-way clutch assembly 100 attached to the torque converter C, and FIG. 5 is a front view of FIG.
The stator one-way clutch assembly 100 includes an outer ring 20 fitted to the stator S main body and a stator shaft (not shown) and an inner ring 30 that is spline-fitted, and between the outer ring 20 and the inner side 30. A plurality of sprags 400 are held by the ribbon spring 440, the outer holder R1, and the inner holder R2.
A recess 22 that fits with the stator S body is formed on the outer periphery of the outer ring 20, and spline teeth 32 that are spline-fitted with a stator shaft (not shown) are formed on the inner periphery of the inner ring 30.
[0004]
FIG. 6 is a perspective view for explaining the sprag 400 used in the conventional stator one-way clutch assembly 100 and the ribbon spring 440 that biases the sprag 400. The sprag 400 is incorporated in the ribbon spring 440. Indicates the energized state.
The neck portion of the sprag 400 is formed with a constriction.
The ribbon spring 440 includes a window that is a space formed by a side bar 441 extending in the longitudinal direction and having a plurality of wrinkles 442 formed at equal intervals, and a cross bar 443 extending in the width direction. A wrinkle 444 with a tab 445 extends from the section.
When the sprag 400 is incorporated into the window portion of the ribbon spring 440, the tab 445 of the wrinkle 444 comes into contact with the constriction of the sprag 400, and the tab 445 biases the sprag 400.
[0005]
The plurality of sprags 400 are held by the outer cage R1 and the inner cage R2 while being incorporated in the ribbon spring 440 as described above.
[0006]
A pair of bushes 500 and 500 are disposed on both axial side surfaces of the stator one-way clutch assembly 100.
A shoulder 52 for receiving the thrust bearings 70 and 70 is formed on the outer surface in the axial direction of the bushes 500 and 500, and an outer shoulder 54 for receiving a corner of the outer ring 20 and a corner of the inner ring 30 are received on the inner surface in the axial direction. An inner shoulder 56 and a holding surface 580 between the outer shoulder 54 and the inner shoulder 56 are provided.
As shown in FIG. 4, in this one-way clutch assembly 100 for a stator, the axial end surfaces of the outer cage R1 and the inner cage R2 come into contact with the holding surfaces 580, 580 of the bushes 500, 500, so The movement of the directional clutch assembly 100 in the axial direction is restricted.
[0007]
[Problems to be solved by the invention]
As described above, the conventional stator one-way clutch assembly 100 includes the outer ring 20, the inner ring 30, the sprag 400, the ribbon spring 440, the outer cage R1, and the inner cage R2, and has a large number of parts. There is a problem that it takes time to assemble.
Moreover, there is a problem that the length in the axial direction becomes long.
[0008]
The present invention includes an inner and outer ring, a plurality of sprags arranged between the inner and outer rings for transmitting torque, and a garter spring that urges the sprags in a meshing direction,
A pair of bushes positioned on both side surfaces of the sprags to restrict axial movement of the sprags, and thrust bearings disposed on both side surfaces of the bushings,
Protrusions are provided on the surfaces of the bushes facing the side surfaces of the sprags,
The above problem has been solved by a one-way clutch assembly for a stator, wherein the protrusion is located at a position that coincides with the movement center of the sprag .
[0009]
[Action]
In the present invention, since the axial movement of the sprag is directly regulated by a pair of bushes, the sprag retainer is not required, the number of parts is reduced, and the axial length is shortened. Is done.
The gap between the adjacent sprags can be prevented by arranging the sprags without leaving a gap between them.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The torque converter C in which the stator one-way clutch assembly 10 of the present invention is incorporated is the same as that shown in FIG.
FIG. 1 is an axial sectional view of a one-way clutch assembly 10 for a stator according to the present invention attached to the torque converter C, and FIG. 2 is a front view of FIG.
[0011]
The stator one-way clutch assembly 10, like the conventional stator one-way clutch assembly 100, has an outer ring 20 formed with a recess 22 that fits into the stator S main body, and a stator shaft (not shown). And an inner ring 30 on which spline teeth 32 for spline fitting are formed.
A plurality of sprags 40 are held between the outer ring 20 and the inner ring 30.
The sprag 40 has a flat shape and is disposed between the outer ring 20 and the inner ring 30 without a gap as shown in FIG.
As shown in FIG. 1, a groove 42 is formed on the outer peripheral surface of the sprag 40, and each sprag 40 is urged in a meshing direction by a garter spring 44 received in the groove 42.
[0012]
In the stator one-way clutch assembly 10 using the sprag 40 having such a shape, when the relative rotation direction of the outer ring 20 and the inner ring 30 is opposite to the direction in which the sprag 40 is engaged, the outer ring 20 and the inner ring 30 are arranged. Torque is not transmitted between them. On the other hand, when the relative rotation direction of the outer ring 20 and the inner ring 30 is the direction in which the sprag 40 is engaged, the sprag 40 is engaged between the outer ring 20 and the inner ring 30, and torque is transmitted between the outer ring 20 and the inner ring 30. The
[0013]
As shown in FIG. 1, a pair of bushes 50, 50 are arranged on both side surfaces of the stator one-way clutch assembly 10 in the axial direction.
As with the conventional bush 500 shown in FIG. 4, the bush 50 is formed with a shoulder 52 for receiving the thrust bearing 70 on the outer surface in the axial direction, and an outer shoulder for receiving the corner of the outer ring 20 on the inner surface in the axial direction. 54, an inner shoulder 56 that receives a corner of the inner ring 30, and a retaining surface 58 between the outer shoulder 54 and the inner shoulder 56.
Further, as shown in FIG. 1, protrusions 60 extending in the circumferential direction are formed on the holding surfaces 58 of the bushes 50, and both side surfaces of the sprags 40 are in contact with the protrusions 60 of the bushes 50, respectively. 50, the movement of the sprag 40 in the axial direction is restricted.
[0014]
The protrusion 60 of the holding surface 58 of the bush 50 is preferably formed at a position that coincides with the center of movement (including rotation) of the sprag 40.
The protrusion 58 reduces the contact area between the bushing 50 and the side surface of the sprag 40 and reduces the frictional force generated between each bushing 50 and the side surface of the sprag 40. Therefore, it is possible to prevent the movement (including rotation) of the sprag 40 from being hindered and the side surface of the sprag 40 and the holding surface 58 of each bush 50 from sticking to each other.
[0015]
【The invention's effect】
Since the one-way clutch assembly for a stator according to the present invention is configured to directly restrict the movement of the sprag in the axial direction with a pair of bushes as described above, the number of parts can be reduced, and a cage or the like can be provided. Since it is not provided, the axial length of the one-way clutch assembly can be shortened.
[0016]
Further, the projection provided on the holding surface of the bushing, since the projection is in contact with the both sides of the sprag in a position which coincides with the movement center of the sprag, is reduced contact area between the bushing and the sprag side, The friction generated between the bush and the sprag can be reduced, and the sprag can be prevented from sticking to the bush due to the lubricating oil.
[Brief description of the drawings]
FIG. 1 is an axial sectional view of a one-way clutch assembly for a stator according to the present invention.
FIG. 2 is a front view of the one-way clutch assembly for the stator shown in FIG. 1;
FIG. 3 is a sectional view of a torque converter to which a one-way clutch assembly for a stator according to the present invention is attached.
FIG. 4 is an axial sectional view of a conventional stator one-way clutch assembly.
5 is a front view of the one-way clutch assembly for the stator of FIG. 4;
FIG. 6 is a perspective view of a sprag and a ribbon spring used in a conventional one-way clutch assembly for a stator.
[Explanation of symbols]
10: Stator one-way clutch assembly 20: Outer ring 30: Inner ring 40: Sprag 44: Garter spring 50: Bush 58: Holding surface 60: Projection 70: Thrust bearing

Claims (1)

A one-way clutch assembly for a stator of a torque converter,
Inner and outer rings, a plurality of sprags arranged between the inner and outer rings for transmitting torque, a garter spring for urging the sprags in a meshing direction, and shafts of the sprags located on both side surfaces of the sprags A pair of bushes for restricting directional movement, and thrust bearings arranged on both side surfaces of the bushes,
Protrusions are provided on the surfaces of the bushes facing the side surfaces of the sprags,
The protrusion is at a position coinciding with the movement center of the sprag ,
One-way clutch assembly for stator.

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