JPH11141574A - One-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the drag of the torque transmitting members as much as possible by providing a holding unit with the second holes for holding the torque transmitting members and the energizing members, and forming the projecting parts in a radius direction for every energizing members in a state that they are inclined in a circumferential direction to support the energizing members. SOLUTION: The plate springs 6 for energizing the rollers 5 as the torque transmitting members are mounted in the second holes 45a, 45b, 45c. The column 46, 48 respectively formed at one side of the second hole comprise the recessed parts 46c, 48c corresponding to the cylindrical shape of the rollers 5 on the areas corresponding to the cylindrical rollers 5. An end part of the plate spring 6 kept into contact with the roller 5 also comprises a recessed part corresponding to the cylindrical shape of the roller 5. By holding the roller 5 in a state that it is held from both sides in a circumferential direction, the roller 5 can be held with the small energization force, and the so-called drag of the roller 5 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch particularly suitable for an automatic transmission of an automobile.

[0002]

2. Description of the Related Art In particular, one-way clutches for automatic transmissions of automobiles have been actively used with the spread of automatic transmission type automobiles.

In a conventional one-way clutch of this type, however, the inner member is disposed radially between the inner member and an outer ring concentric with the inner member, and takes a torque transmitting position and a torque non-transmitting position. A cylindrical roller, which is a torque transmitting member for making the outer ring and the outer ring integral or relatively rotating, is held together with a biasing member by a metal plate holder, and the outer ring is pivoted to the outer ring. In the direction, it is fixed by caulking two side plates, and in the circumferential direction via a block bearing.

[0004] In detail, this metal plate retainer in the prior art includes a first and second annular side portions extending radially on both axial sides and a gap between the first and second annular side portions. And a biasing member formed of a connecting column and biasing the roller and the roller to a torque transmitting position in a hole defined between the first and second annular side portions and the column. And a block bearing for positioning the retainer in the circumferential direction with respect to the outer ring is fitted. The axial positioning of the retainer with respect to the outer ring is performed by the first and second annular side portions sandwiching the outer ring from both sides.

In such prior art, an accordion-shaped leaf spring is known as a biasing member, and the roller is held by pressing the roller against a roller support portion of a pillar of a retainer with the leaf spring. Was.

[0006]

However, in the structure of the prior art, when the inner ring or the outer ring rotates in the idling direction, that is, in the torque non-transmission direction, an excessive drag torque acts on the torque transmission member, ie, There was a problem that drag of the torque transmitting member was caused.

An object of the present invention is to provide a one-way clutch in which the drag of the torque transmitting member, which has been a problem in the related art, is reduced as much as possible.

[0008]

SUMMARY OF THE INVENTION A one-way clutch according to the present invention has an inner member and the same center as the inner member.
An outer ring having a predetermined number of cam surfaces on the inner periphery, a torque transmission member disposed between the inner member and the outer ring, and being displaced between a torque transmission position and a torque non-transmission position of the outer ring cam surface; Until such time, it is composed of an urging member for urging the torque transmitting member to the torque transmitting position, and a retainer for holding the torque transmitting member and the urging member. A groove extending in the axial direction is formed at a location, and is fitted into the groove through a hole provided in the retainer corresponding to the groove, and is configured to position the retainer in the circumferential direction. In a one-way clutch including a block bearing, the retainer includes a first annular side portion, a second annular side portion, and a column portion that axially connects the first annular side portion and the second annular side portion. And the column portion includes the first and second annular side portions. And defining said hole for the block bearing mounted together in correspondence with the groove of the outer ring,
The retainer defines a second hole for retaining the torque transmitting member and the biasing member with the first and second annular side portions and the column, and the column of the retainer The predetermined one has at least two radially projecting portions for supporting the urging member in the circumferential direction for each of the urging members, and the radially projecting portion is inclined in the circumferential direction. The biasing member is wound around one of the radial projections, sandwiches the projection, and is fixed to the other one with the clip-shaped portion and the radial projection. And a tongue that engages with one to adjust the bias.

[0009]

1 and 2 illustrate a one-way clutch as an embodiment of the present invention. A one-way clutch is provided around an inner member 1, which is an inner race, at the same center as the inner member 1. FIG. A certain outer ring and cage assembly 2 is fitted.
The outer periphery of the inner member 1 is a circumferential track surface.

The outer ring and retainer assembly 2 includes an outer ring 3 and a retainer 4, a roller 5 as a torque transmitting member held by the retainer 4, and presses the roller 5 by contacting the roller 5. And a leaf spring 6 as an urging member. Further, as described later, the retainer 4 is retained without play in the circumferential direction with respect to the outer ring via the block bearing 7.

The outer ring 3 is made of a metal such as a press-formed product or a sintered alloy, and has an inner peripheral surface provided with a groove 31 extending in an axial direction at a predetermined angle along a base circle. A predetermined number of cam surfaces 32 are formed between the grooves on the inner peripheral surface of the outer ring. The cam surface 32 is a smoothly inclined surface that forms a deep cam surface portion 32a having a large space with the outer peripheral surface of the inner member 1 and a shallow cam surface portion 32b having a small space.

As shown in FIG. 3B, one side surface on the inner peripheral side of the outer ring has an annular stepped portion 3 having a diameter slightly larger than the base circle.
3 are formed.

The outer diameter of the first annular side portion 41 of the retainer 4 is
It is at least larger than the diameter of the base circle of the outer ring, and has a diameter sufficient to come into contact with the corresponding side surface of the outer ring 3 when the retainer 4 is assembled to the outer ring 3 as described later.

The outer diameter of the second annular side portion 42 of the retainer 4 is
Except for the radial projection 43, it is smaller than the base circle of the outer race 3. The radial protrusions 43 are provided at the same angular arrangement as the above-described axial grooves 31 of the outer race 3, and the outer diameters of these radial protrusions 43 are smaller than the diameter of the groove bottom of the axial grooves 31. ing.

The retainer 4 is formed as an integrally molded product made of plastic, and as is apparent from FIG. 4B, a first annular side portion 41 having a large diameter and a second annular side portion 4 having a small diameter.
2, and three types of pillars 46, 47, 48 that connect the first and second annular side portions 41, 42 in the axial direction on the inner peripheral side.
And are integrally formed. The post 46 includes two radial protrusions 46a, 46b, and the post 47 includes three radial protrusions 47a, 47b, 47d.

Between the column portions 47 and 48 of the retainer 4, a first hole 44 penetrating in the radial direction at the same angle as the axial groove portion 31 of the outer race 3 is defined. The circumferential width of the first hole 44 is larger than the circumferential width of the groove 31 of the outer ring. When the retainer 4 is assembled at a predetermined position in the outer ring 3, the block bearing passes through the first hole 44 from the inside of the retainer. 7, the head 71 of the block bearing 7 is fitted into the groove 31 of the outer ring so that the retainer 4 can be positioned in the circumferential direction with respect to the outer ring 3.

The block bearing 7 is formed, for example, in Japanese Utility Model Application No.
No. 1403, it is made of a sintered alloy, and has a hole 72 in the axial direction. Since the retainer 4 is made of plastic, the first hole 44 is formed to have a smaller circumferential width than the circumferential width of the body portion 73 of the block bearing 7, and is pressed by utilizing the elasticity of the plastic. . The block bearing 7 has one shoulder portion pressed by the projecting portion 47d of the retainer as described later, and there is no play or play, and the retainer 4
Can be reliably positioned with respect to the outer ring 3 in the circumferential direction.

A second hole 45 is provided between the pillars 46 and 46, 46 and 47 and 48 and 46 of the retainer 4.
a, 45b, and 45c are formed respectively, and these second holes 45a, 45b, and 45c are of the same size, and when the retainer 4 is positioned in the outer race 3, the corresponding cam surface 32 of the outer race is formed. And have come to face.

In each of the second holes 45a, 45b and 45c, a roller 5 as a torque transmitting member and a leaf spring 6 for urging the roller 5 are provided. That is, the roller 5 is provided in the second holes 45a, 45b and 45c.
The rollers 5 are also provided with second holes 45a, 45a.
B and 45c are urged toward the shallow cam surface portion 32b by the urging member 6 which is arranged adjacent to and in contact with the cam surface portion 32b.

The portion of the pillars 46, 48 defining one side of the second holes 45a, 45b, 45c (the left side in FIG. 4A) facing the cylindrical roller 5 is a roller cylinder. Depressions 46c and 48c are provided corresponding to the shape.

The end of the leaf spring 6 which comes into contact with the roller 5 is also formed with a recess 61 in conformity with the cylindrical shape of the roller 5. By holding the roller 5 so as to embrace it from both sides in the circumferential direction, the roller 5 can be held with a smaller urging force, so that the drag of the roller 5 can be reduced.

The two projections 46a, 46b and 47a, 47b for supporting the corresponding leaf springs 6 in the second holes 45a, 45b and 45c are inclined as shown in FIG.

As shown in FIG. 5, the base 62 of the leaf spring 6 has one of the protrusions 46a or 48a of the column 46 or 47.
Is bent to the inner diameter side so as to be wound around from the outer diameter side, and is folded outward at the inner diameter base side to form a folded portion 63, and the folded portion 63 pulls the other protruding portion 46b or 47b. And is supported by the column 46 or 47.
In FIG. 5, the accordion-shaped leaf spring main body 64 is cut away for convenience of illustration.

A connecting portion 65 of the leaf spring base 62 to the corrugated or accordion-like leaf spring main body 64 is partially cut off at the center in the axial direction and turned back to form a tongue-like portion 66, and one of the protrusions A holding portion is formed at 46b or 47b. The degree and direction of urging of the roller 5 can be adjusted by the support of the folded-back portion 63 and the degree of tension of the tongue-shaped portion 66, and a stable urging force can be applied to the roller 5 as a torque transmitting member. FIG.
Shows how the pressing direction of the leaf spring changes by changing the inclination of the tongue 66.

The radial projections 46a, 46b; 47
Since a, 47b, 47d; and 48a, 48b are formed to be inclined in the same direction, the shape of the cage molding die can be simplified, and the cage 4 can be easily molded. That is, the mold can be punched diagonally, and molding can be performed without forcibly removing the concave portions 46c and 48c for holding the roller at the tip of the mold.

Next, a method of assembling the outer ring / retainer assembly will be described.

First, a leaf spring 6 and a roller 5 are mounted on a retainer 4 made by injection molding integrally with plastic.
And make a cage-roller assembly.

Next, the cage / roller assembly is inserted into the outer race 3 from the side. Upon insertion, the retainer 4 is inserted by making the radial projection 43 of the retainer 4 correspond to the axial groove 31 on the inner peripheral side of the outer ring. Radial projection 43 of cage 4
However, since the roller 5 is set so as to come into contact with the cam surface 32 of the outer ring while being fitted into the axial groove 31 of the outer ring 3, the assembly of the retainer / roller assembly to the outer ring is easy. When the retainer 4 is rotated by a predetermined angle with respect to the outer ring 3 after the insertion, the radially projecting portion 43 of the retainer 4 faces and engages with the step 33 of the outer ring 3, so that the retainer / roller assembly is It is positioned in the axial direction with respect to the outer ring 3. Step 3
Since there is a radial projection 43 of the cage in 3, the side surface of the outer race is flush with the side surface of the cage.

At this time, the relationship between the retainer 4 and the outer ring 3 is in a predetermined positional relationship. Next, the block bearing 7 is inserted from the inner diameter side of the retainer 4 through the first hole 44, and The head 71 is fitted into the axial groove 31 of the outer race 3 as described above, and the retainer 4 is positioned and fixed in the circumferential direction.

The outer ring / retainer assembly 2 is completed in this manner, and the one-way clutch is completed by fitting the inner member 1 together.

[0031]

According to the present invention, the drag torque of the torque transmitting member, which is generated when the inner ring or the outer ring rotates in the idling direction, that is, the non-torque transmitting direction, that is, so-called drag of the torque transmitting member is minimized. Can be.

According to the present invention, the holding ability of the torque transmitting member is improved, and the pressing force of the spring against the torque transmitting member can be minimized.

Further, according to the present invention, by providing a tongue-shaped portion on the torque transmitting member and pressing it against the holder, adjustment and setting of the pressing direction of the torque transmitting member can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view showing a one-way clutch with a part cut away as a preferred embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a schematic view of an outer ring according to the embodiment, and FIG.
Is a front view, and (b) is a 3B-3B sectional view.

FIG. 4 is a schematic view of the retainer of the embodiment,
1A is a front view of the retainer viewed from the opposite side in the axial direction with a cutout of an upper half of the retainer, FIG. 2B is a 4B-4B cross-sectional view of FIG. 1A, and FIG. It is an enlarged view.

FIG. 5 is an explanatory diagram showing a relationship between a retainer and a leaf spring in the embodiment.

FIG. 6 is a plan view showing only a spring portion in the embodiment.

FIG. 7 is a view taken in the direction of arrow 6C showing a part of the leaf spring shown in FIG. 6;

FIG. 8 is a view of the plate spring shown in FIG.

FIG. 9 is an explanatory view showing a relationship between a leaf spring and a retainer pillar supporting the leaf spring.

FIG. 10 is an explanatory view showing a state where a roller is inserted in FIG. 9;

FIG. 11 is an explanatory diagram showing a state in which the pressing force direction changes by changing the setting of the tongue-shaped portion of the leaf spring.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 inner member 2 outer ring / retainer assembly 3 outer ring 4 retainer 5 torque transmitting member (roller) 6 biasing member (leaf spring) 7 block bearing 31 axial groove (groove extending in axial direction) 32 cam surface 32a deep cam Surface portion 32b shallow cam surface portion 33 annular step portion 41 first annular side portion 42 second annular side portion 43 radial projecting portion 44 first hole 45a, 45b, 45c second hole 46, 47, 48 column Parts 46a, 46b; 47a, 47b radial projections 46c, 48c for urging member support 47d radial projections 61d for block bearing support 61 concave parts 62 leaf spring base 63 folded parts (clip parts) 64 accordion-shaped plates Spring body 65 Connecting part 66 Tongue 71 Head 72 Hole 73 Body

Claims (5)

[Claims] 1. An inner member, an outer ring which is concentric with the inner member and has a predetermined number of cam surfaces on an inner periphery, is disposed between the inner member and the outer ring, and a torque transmission position of the outer ring cam surface. A torque transmitting member displaced between a torque non-transmitting position, an urging member for urging the torque transmitting member to the torque transmitting position until a predetermined torque is applied, the torque transmitting member and the urging member A groove extending in the axial direction is formed at a predetermined location on the inner peripheral side of the outer ring. Corresponding to the groove, through a hole provided in the retainer, the inside of the groove is formed. And a block bearing configured to position the retainer in the circumferential direction. The retainer includes a first annular side portion, a second annular side portion, the first annular side portion, and the first annular side portion. A pillar portion axially connecting the two annular side portions to each other; Defines the hole for mounting the block bearing corresponding to the groove of the outer race together with the first and second annular side portions, and the retainer includes the first and second annular side portions and the hole. A one-way clutch, wherein a second hole for holding the torque transmitting member and the urging member with the column is provided, wherein a predetermined one of the columns of the retainer includes the urging member. At least two radial projections are formed in the circumferential direction for each of the urging members, and the radial projections are formed to be inclined in the circumferential direction,
The biasing member is wound around one of the radial projections, and is sandwiched between the projections and folded to engage with the clip portion fixed to the other one and the one of the radial projections. A one-way clutch comprising: 2. The biasing member is a leaf spring, and the torque transmitting member is a roller. The leaf spring is folded back from the base of the tongue-like portion in an accordion shape, and a tip end portion is connected to the roller. The one-way clutch according to claim 1, wherein the roller is biased in contact with the roller. 3. The one-way clutch according to claim 2, wherein the distal end of the leaf spring has a concave portion corresponding to the shape of the roller. 4. The pillar according to claim 2, wherein one of the pillars facing the roller has a concave portion shaped to embrace the roller according to the shape of the roller. The described one-way clutch. 5. The one-way clutch as claimed in claim 1, wherein said retainer is a one-piece molded product made of plastic.