JP4650189B2 - Sprag type one-way clutch spring and sprag type one-way clutch provided with the spring - Google Patents

Description

  The present invention relates to a spring for urging a sprag held by a cage in a sprag type one-way clutch (hereinafter referred to as a one-way clutch) used in a power transmission device such as an automatic transmission of an automobile. is there.

  The one-way clutch is a one-way clutch that transmits the rotational power of one of the outer ring and the inner ring to the other or interrupts the transmission by tilting the sprag according to the relative rotation between the outer ring and the inner ring. The one-way clutch will be described with reference to FIG. FIG. 6 is a sectional view of the one-way clutch. The one-way clutch 1 is disposed in an annular space between the outer ring 2 and the inner ring 3. The one-way clutch 1 includes a cage 4, a sprag 5, and a spring 6. The retainer 4 includes a plurality of column portions 4a in the circumferential direction, and includes window holes 4b between the column portions 4a in the circumferential direction. The sprag 5 is attached to the window hole 4b. The spring 6 has a plurality of window holes 6c for inserting sprags in the circumferential direction corresponding to the window holes 4b of the retainer 4, and the sprags 5 are connected to the outer ring 2 and the inner ring by claw portions 6d protruding into the window holes 6c. 3 (see Patent Document 1).

  In the one-way clutch 1 having such a spring 6, the number of sprags 5 is changed when changing the torque transmission capacity. At the time of this change, when sprags having the same shape are used, it is required to maintain the same spring spring force for biasing the sprags.

  However, the conventional spring 6 has problems as described with reference to FIGS. 7 (a) and 7 (b). FIGS. 7A and 7B are plan views of a part of the spring 6. The spring 6 includes a pair of annular portions 6a facing in parallel on both sides in the axial direction, and a plurality of column portions 6b are installed at equal intervals in the circumferential direction between both the annular portions 6a. A window hole 6c is defined between the directions, and a claw portion 6d extending toward the other circumferential direction is provided on one side surface in the circumferential direction of the column portion 6b, and the other circumferential direction of the column portion 6b is provided in the window hole 6c. A space portion between the side surface and the end portion of the claw portion 6d is provided as the insertion space portion 6e of the sprag 5.

7A and 7B, A and A ′ are the arrangement pitch of the window holes 6c, B is the insertion dimension of the sprag 5, C and C ′ are the length of the claw portion 6c (claw length), and D and D 'Is the width (column width) of the column portion 6b, and E is the width of the claw portion 6d. The arrangement pitch A of the window holes 6c shown in FIG. 7A is changed to the arrangement pitch A ′ (> A) shown in FIG. Since the sprags 5 having the same shape are used, the insertion dimension B of the sprags 5 is the same in both FIG. 7 (a) and FIG. 7 (b). Therefore, the claw length is changed from the claw length C in FIG. 7A to the claw length C ′ in FIG. 7B, and the column width is changed from the column width D in FIG. 7A to FIG. 7B. It is necessary to change to the column width D ′. Such a change in the claw length or the column width changes the spring spring force for urging the sprag 5. Therefore, in the conventional spring 6 shape, when the arrangement pitch of the window holes 6c is changed using the sprags 5 having the same shape, the spring spring force is not changed without changing the length of the claw portion 6d or the width of the column portion 6b. It was not possible to ensure a certain level.
JP 2003-21174 A

  Therefore, the problem to be solved by the present invention is to make it possible to ensure a constant spring spring force when changing the arrangement pitch of the window holes using sprags having the same shape.

The spring for a sprag type one-way clutch according to the present invention has a pair of annular portions facing each other on both sides in the axial direction, and a window hole is defined between the annular portions at equal intervals in the circumferential direction. For a sprag type one-way clutch comprising a plurality of pillar portions and a claw portion extending from one circumferential side surface of the pillar portion to the other circumferential direction, and a sprag biased by the claw portion is inserted into the window hole In the spring, a step portion is provided that forms a sprag insertion space portion that is provided extending from the other side surface in the circumferential direction of the column portion to one side in the circumferential direction and into which the sprag is inserted between the claw portions, A space between adjacent step portions in the circumferential direction is used as an arrangement pitch of the window holes, and an axial width of the space in the step portion is smaller than an axial width of the sprag insertion space portion .

  The stepped portion can be preferably formed on both axial sides of the other circumferential side surface of the column portion. By forming the step portion on both sides in the axial direction, the effect of the step portion on the spring spring force can be reduced, and the spring spring force can be determined by the majority of the column portion excluding the step portion together with the claw portion. .

  As long as the stepped portion has a position, shape, and dimensions that do not affect the spring spring force, the number of steps is not limited to the number of the stepped portions, and may be a single step or a plurality of step portions.

  As shown in the embodiment, the stepped portion is not limited to a shape that extends in the circumferential direction integrally with the annular portion from both axial sides of the other side in the circumferential direction of the column portion. The shape may be a window hole arrangement pitch adjusting portion, and the window hole arrangement pitch adjusting portion may be bent further inward in the axial direction to form an L shape in a plan view. In this case, the window hole arrangement pitch can be adjusted by adjusting the length of the window hole arrangement pitch adjusting part, and the sprags urged by the claw parts by the sprag receiving part can be easily received.

  According to the present invention, the claw length of the claw portion and the column width of the column portion main body are made constant to ensure a constant spring spring force, and the insertion space for the sprag of the same shape is provided between the step portion and the claw portion. The window hole pitch can be changed by changing the interval between the adjacent step portions in the circumferential direction, that is, changing the length of the step portion in the circumferential direction. That is, in the present invention, when the arrangement pitch of the window holes is changed using sprags having the same shape, the spring spring force can be kept constant without changing the length of the claw portion or the width of the column portion. .

  According to the present invention, it is possible to provide a sprag type one-way clutch spring capable of ensuring a constant spring spring force when changing the pitch of window holes using sprags having the same shape.

  Hereinafter, with reference to the accompanying drawings, a sprag type one-way clutch spring (hereinafter referred to as a spring) according to an embodiment of the present invention and a sprag type one-way clutch incorporating the same (hereinafter referred to as a one-way clutch). ). FIG. 1 is a development plan view of a part of the spring 6 according to the present embodiment. 1A is a development plan view of the spring 6 in which the arrangement pitch of the window holes 6c is A, and FIG. 1B is a development plane of the spring 6 in which the arrangement pitch of the window holes 6c is A ′ (> A). FIG. The spring 6 includes a pair of annular portions 6a, a plurality of column portions 6b, and a plurality of claw portions 6d. The pair of annular portions 6a face each other in parallel on both axial sides. The column part 6b is spanned between the both ring parts 6a at equal intervals in the circumferential direction, and defines a window hole 6c between the circumferential directions. The column portion 6b includes a claw portion 6d at a substantially central portion of one side surface in the circumferential direction, and step portions 6f are formed on both sides in the axial direction on the other side surface in the circumferential direction. The claw portion 6d extends from the substantially central portion of one side surface of the column portion 6b toward the other circumferential side. The step portion 6f faces the claw portion 6d in the circumferential direction in the window hole 6b, and a space between the step portion 6f and the end portion of the claw portion 6d serves as a sprag insertion space portion 6e.

  1A and 1B, A and A ′ are the arrangement pitch of the window holes 6c, B is the insertion dimension of the sprag 5, C is the length of the claw portion 6d, D is the column width of the column portion 6b, and E is the nail. The claw widths α and α ′ of the portion 6d are step lengths of the step portion 6f. The arrangement pitch A of the window holes 6c shown in FIG. 1A is changed to the arrangement pitch A ′ (> A) shown in FIG.

In making this change,
(1) Both sprags 5 have the same shape.

 (2) The insertion dimension B of the sprag 5, the length C of the claw portion 6d, and the column width D of the column portion 6b are the same in both FIG. 1 (a) and FIG. 1 (b).

  In the above, as is clear with reference to FIGS. 1A and 1B, the above conditions (1) and (2) are satisfied and the arrangement pitch of the window holes 6c is changed from A to A ′. Can be achieved by changing the step length of the step portion 6f from α to α ′. When the pitch of the window holes 6c is changed from A to A ′ using the sprags 5 having the same shape, the length C of the claw portion 6d and the width D of the column portion 6b are changed according to the above conditions (1) and (2). Without this, the spring 6 that can ensure a constant spring spring force can be obtained.

  2 is a sectional view of a part of the one-way clutch 1 incorporating the spring 6 according to the embodiment, FIG. 3 is a perspective view of the spring 6, and FIG. 4 is an enlarged perspective view of a part of FIG. The one-way clutch 1 is disposed in an annular space between the outer ring 2 and the inner ring 3. The one-way clutch 1 includes a cage 4, a plurality of sprags 5, and the spring 6 according to the embodiment. In the one-way clutch 1, when the outer ring 2 rotates relative to the inner ring 3 in the clockwise direction, the sprag 5 housed in the window hole 4 b of the cage 4 is engaged between the inner and outer rings 2 and 3. When the inner / outer rings 2 and 3 rotate integrally and the rotational power from the outer ring 2 is transmitted to the inner ring 3, conversely, when the outer ring 3 rotates relative to the counterclockwise direction, the engagement of the sprag 5 is released and the outer ring 2 is released. Runs idle and power transmission is interrupted. The spring 6 is hardened by pressing a thin metal plate, rounded into an annular shape, attached to the inner peripheral surface of the cage 4, and biased (preliminary) in a direction in which the sprag 5 is engaged with the inner and outer rings 2 and 3. Stress).

  FIG. 5 is a sectional view of a part of the one-way clutch incorporating the spring according to the embodiment. The one-way clutch 1 includes an outer cage 4A, an inner cage 4B, a plurality of sprags 5, and the spring 6 according to the embodiment. The spring 6 according to the embodiment can be incorporated in a one-way clutch provided with such a two-piece cage.

  In the above, the present invention is not limited to the above-described embodiment, but includes various modifications that do not exceed the scope of the claims.

FIG. 1A is a developed plan view of a part of a spring according to the present embodiment, FIG. 1A is a developed plan view of a spring having an arrangement pitch of window holes A, and FIG. 1B is an arrangement pitch of window holes. It is an expansion | deployment top view of the spring whose is A '(> A). It is sectional drawing of a part of one-way clutch incorporating the spring of embodiment. It is a perspective view of the spring of an embodiment. FIG. 4 is a partially enlarged perspective view of FIG. 3. It is sectional drawing of a part of another one-way clutch incorporating the spring of embodiment. It is sectional drawing of a part of one-way clutch incorporating the conventional spring. FIG. 7A is a developed plan view of a part of a conventional spring, FIG. 7A is a developed plan view of a spring having an arrangement pitch of window holes A, and FIG. 7B is an arrangement pitch of window holes A ′ ( It is a development top view of a spring which is> A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 One-way clutch 2 Outer ring 3 Inner ring 4 Cage 5 Sprag 6 Spring 6a Ring part 6b Column part 6c Window hole 6d Claw part 6e Sprag insertion space part 6f Step part

Claims (2)

A pair of annular portions facing each other on both sides in the axial direction, a plurality of column portions that are spanned between the annular portions at equal intervals in the circumferential direction, and define a window hole between the circumferential directions, and the circumference of the column portions A sprag type one-way clutch spring having a claw portion extending from one side surface in the circumferential direction to the other in the circumferential direction, and a sprag urged by the claw portion is inserted into the window hole.
A step portion is provided that extends from the other side surface of the column portion in the circumferential direction in the window hole and forms a sprag insertion space portion in which the sprags are inserted between the claw portions. A spring for a sprag type one-way clutch characterized in that the space between adjacent step portions is an arrangement pitch of window holes, and the axial width of the space in the step portion is smaller than the axial width of the sprag insertion space portion. .   In a sprag type one-way clutch comprising a cage having a plurality of window holes in the circumferential direction, a plurality of sprags held in the window holes, and a spring for biasing these sprags, the spring is A sprag type one-way clutch characterized by being the spring according to claim 1.

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