JPH0582487B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a one-way clutch used in starting devices for automobiles, motorcycles, etc., power transmission devices for various industrial machines, and the like.

[Conventional technology]

Clutches, on the other hand, have the function of transmitting torque only when rotating in the forward direction, and as various industrial machines have become labor-saving, faster, and more efficient in recent years, their fields of use have expanded and become important. It has become a mechanical element.

A typical one-way clutch is one that includes a clutch body connected to a rotating shaft and a rotating member, with a wedge-shaped space formed between these members, and a rolling element held in this space. The rotation shaft and the rotation member are configured to be connected to each other.

By the way, the clutch body requires strength, so conventionally, by processing high-strength materials,
It forms a space for holding the rolling elements and a cam surface.

[Problem to be solved by the invention]

However, conventional one-way clutches of this type have had the problem that cutting is required to assemble the clutch body, making the assembly process time-consuming. Furthermore, the conceptual structure becomes complicated because the space for accommodating and holding the rolling element and the cam surface are formed in one member.

Therefore, in response to this, the present applicant has filed Japanese Patent Application No. 58-132596 with the invention title "One-Way Clutch".
proposed. The clutch body is divided into a plate part that requires strength and a housing part that does not require strength, a recessed part for holding the rolling element is provided in the housing part, and a tongue part in which the rolling element engages with the plate part is bent. It was formed. However, in this one-way clutch, the cam is provided on the plate part by bending the tongue part, so in order to obtain the strength of the cam, it is necessary to make the plate part and the tongue part relatively thick. The problem was that the clutch itself became heavier and larger.

[Means to solve the problem]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to make the clutch body simple in structure, easy to assemble, and moreover, to reduce the size and weight of the clutch body.

The one-way clutch according to the present invention includes a clutch body, a plate portion fixed to a rotating shaft, and a rotating member fixed to one axial side of the plate portion and rotatably fitted in a radial center portion. a housing part in which a fitting hole is formed; a recessed part that is open to the inner peripheral surface side of the fitting hole and the plate part side; The plate part is provided with a cam part that faces into the rolling element accommodation chamber and has a cam surface with which the rolling element is connected, and the plate part has a cam surface. A reinforcing portion is provided that extends continuously in the direction of the shaft.

[Effect]

The clutch body is divided into a plate portion which requires strength and has a simple structure, and a housing portion which does not require much strength and has a recessed portion. Then, the clutch body is assembled by overlapping the plate part and the housing part in the axial direction, and by assembling in this way, the opening part of the recess on the plate part side is closed and a rolling element accommodation chamber is formed. Ru. Therefore, when assembling the clutch body, there is no need to process a strong material into a complicated shape, and moreover, the simple operation of overlapping two members is sufficient.

Further, the load acting on the cam surface is dispersed in the reinforcing portion provided continuously on the cam surface.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing a one-way clutch according to the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line -- in FIG. Reference numeral 1 designates a clutch body, and the clutch body 1 is coupled to a rotating shaft 2 on the driven side from one side, and a rotating member 3 on the driving side is rotatably fitted on the other side.

The clutch body 1 is composed of a plate portion 4 formed on a plate, and a housing portion 6 to which a plurality of fixing screws 5 are fixed to one side of the plate portion 4 in the axial direction. is connected to the rotating shaft 2 through a spline 7 formed in its central hole, and the rotating member 3 is rotatably fitted into the housing portion 6.

8 is a cam body provided at the edge of the plate portion 4. The cam body 8 includes a cam portion 8a having a plurality of cam surfaces 10 facing the outer circumferential surface of the rotating member 3 and to which rollers 9 as rolling elements are connected, and
0 and a reinforcing portion 8b that extends in the radial direction, forming an annular shape. And this cam body 8
The roller 9 is sandwiched between the rotating member 3 and the rotating member 3. In this embodiment, the plate portion 4 is formed from a sheet metal material pressed into a substantially triangular shape. The cam body 8 is formed into an annular shape by drawing the peripheral edge of this sheet metal material into a substantially triangular shape.
Moreover, it is formed integrally with the plate portion 4. In other words, the cam body 8 is integrally formed with the plate portion 4 in the cross section L.
It is set up in the shape of a letter. Three cam surfaces 10 are formed on the inner surface of the cam body 8 at equal intervals in the circumferential direction,
It is inclined so as to gradually approach the outer circumferential surface of the rotating member 3 in the rotation direction of the rotating member 3. In this drawing process, the corner 10a of the cam surface 10 is recessed into an arc shape to ensure engagement with the roller 9.

The housing portion 6 is made of a resin material, a metal material such as aluminum, and is formed into a disk shape having a central hole serving as a fitting hole into which the rotating member 3 is fitted, and a substantially triangular groove into which the cam body 8 is inserted. has been done.
The central hole is opened at a radially central portion of the housing portion 6. At positions corresponding to the three cam surfaces 10 of the housing portion 6, three recessed portions 11 are provided which form a space S as a rolling element storage chamber that rotatably holds the roller 9 together with the cam body 8. has been done. This concave portion 11 is formed so as to be open toward the inner circumferential surface of the central hole and the plate portion 4 side.

That is, the one-way clutch has a clutch body 1
The plate portion 4 and the rotating member 3 are connected via a roller 9 held in a space S formed between these members.

The concave portions 11 are bulged so that the opening edges are close to each other, and the facing interval l is narrowed to be smaller than the diameter of the roller 9. For this reason, roller 9
Even if the rotating member 3 is not fitted, it will not fall off.

Reference numeral 20 denotes a spring loading groove in which a spring 22 for pressing the roller 9 via the cap 21 is loaded. It is opened at 11. The spring 22 is held by covering the opening on the inner surface of one side of the housing portion 6 with the plate portion. The spring 22 is located at a position opposite to the opening of the spring loading groove 20 on the concave portion 11 side of the housing portion 6.
is locked in a compressed and deformed state, and the space S of the roller 9 is
An insertion hole (not shown) is provided through which a jig for easy loading is inserted.

In the one-way clutch configured in this way, when the rotating member 3 is driven in the direction of arrow A, power is transferred from the cam body 8 to the plate portion 4 via the roller 9.
and the rotating shaft 2 is driven. That is, power transmission is performed by the plate portion 4,
The housing portion 6 simply functions as a member for holding the roller 9.

Therefore, the clutch body 1 can be divided into the plate part 4, which requires strength, and the housing part 6, which does not require much strength. Therefore, only the plate portion 4 having a simple structure uses a material having strength, and the housing portion 6 having a complex structure having the concave portion 11 can be formed from a material that is easy to process.

The clutch body 1 is assembled by overlapping the plate portion 4 and the housing portion 6 in the axial direction.
The side opening portion is closed to form a roller accommodating space S. Therefore, when assembling the clutch body 1, there is no need to process a strong material into a complicated shape, and moreover, the simple operation of overlapping two members is sufficient.

In addition, since the cam body 8 is provided with the reinforcing portion 8b, the load acting on the cam surface 10 in the direction of arrow B during operation of the one-way clutch is applied not only to the corner 10a of the cam surface 10 but also to the reinforcing portion 8b. But you can take it. In other words, the stress that was conventionally concentrated on a part of the cam is dispersed. Therefore, it is possible to receive a larger load than in the conventional case where the load moment acts only on a part of the cam surface.

Therefore, the strength of the cam surface 10 is improved, and the required strength can be obtained relatively easily even when the plate portion 4 and the cam body 8, which are formed thinner than before, meet. As a result, even if a load in the direction of arrow B acts on the cam surface 10 repeatedly, the cam surface 10 will not be bent outward.

Furthermore, by making the cam body 8 annular,
Since the tip of the cam surface 10 is restrained, when machining the cam surface 10, it is possible to improve the machining accuracy in terms of dimensions and the like. Even if heat treatment is required to ensure the surface pressure strength of the cam surface 10, thermal deformation is reduced due to the constraint.

FIG. 4 is a cross-sectional view of a main part showing another embodiment. In this figure, the same or equivalent members as those shown in FIG. In this embodiment, an outwardly projecting flange 25 is integrally provided at the edge of the cam body 8, and other members are the same as those shown in FIGS. 1 to 3. In this way, the strength of the cam surface 10 can be further improved by the flange 25.

As described above, the present invention improves the strength of the cam surface 10 by providing the reinforcement degree 8b to the cam body 8 provided on the plate portion 4. Therefore, the cam body 8 is The plate portion 4 is not limited to one formed by drawing the plate portion 4 into a substantially triangular shape. For example, as shown in FIG. 5 as a perspective view of the main part, and as shown in FIG. 6 as a cross-sectional view of the main part, a bottomed cylindrical sheet metal workpiece 30 may be formed by drawing. That is, in this embodiment, the axially central portion of the outer peripheral surface of the sheet metal workpiece 30 is recessed in the inner diameter direction to form the cam surface 10. Therefore, the cam body 8 is formed with a bent edge 31 having an L-shaped cross section.
This bent portion is intended to improve strength.

In addition to being provided by drawing, the cam body may be provided integrally with the plate portion by sintering, forging, or casting. Further, the same effect can be obtained even if it is formed separately from the plate part and fixed to the plate part by welding, brazing, or the like.

〔Effect of the invention〕

As explained above, according to the present invention, the clutch body is rotatably fitted into the plate portion fixed to the rotating shaft and the radially central rotating member fixed to one axial side of the plate portion. a housing portion in which a fitting hole is formed; a recessed portion that is open toward the inner circumferential surface of the fitting hole and toward the plate portion; A rolling element housing chamber for housing and holding the rolling element is formed by the plate part, and a cam part facing into the rolling element housing and having a cam surface with which the rolling element engages is provided on the plate part, By providing a reinforcing portion that extends radially continuously on the cam surface, the clutch body can be formed by combining members with a simple structure, and when assembling the clutch body, it is possible to form a strong material into a complex shape. This eliminates the need for additional processing and requires only the simple task of overlapping two parts.

Therefore, it is possible to obtain a one-way clutch that has a simple structure and is easy to assemble.

Further, since the clutch body can be divided into a portion where strength is required and a portion where strength is not required, both can be made of materials suitable for their respective functions. Therefore, the weight of the clutch body can be reduced compared to the case where the entire clutch body is made of a heavy and high-strength material.

In addition, since the load acting on the cam surface is dispersed by the reinforcing section provided continuously on the cam surface, the plate section can be made thicker than when the plate section is made thicker to ensure the rigidity of the cam section. Can be formed relatively thin. Therefore, the rigidity of the cam portion can be increased with a simple configuration without increasing the weight or increasing the size.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a one-way clutch according to the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is another embodiment. FIG. 5 is a perspective view of a main part showing another embodiment, and FIG. 6 is a sectional view of a main part. DESCRIPTION OF SYMBOLS 1... Clutch body, 2... Rotating shaft, 3... Rotating member, 4... Plate part, 6... Housing part, 8... Cam body, 8a... Cam part, 8b... Reinforcement part, 9... …roller.

Claims (1)

[Claims] 1. In a one-way clutch that connects a clutch body coupled to a rotating shaft and a rotating member via a rolling element held in a space formed between these members, the clutch body is fixed to the rotating shaft. a housing part fixed to one axial side of the plate part and having a fitting hole formed in the radial center part into which the rotating member is rotatably fitted; A recess that is open toward the inner circumferential surface of the fitting hole and the plate is formed in the housing, and the recess and the plate form a rolling element storage chamber that accommodates and holds the rolling element; The plate part is provided with a cam part having a cam surface facing into the rolling element housing chamber and with which the rolling element engages, and the plate part is provided with a reinforcing part extending in the radial direction continuously from the cam surface. One-way clutch.