JPS61109925A - One way clutch - Google Patents

Abstract

PURPOSE:To enlarge a contact area between a cam face and rolling member, by separating a clutch body into a plate part and housing part and a plurality of pieces of the rolling members is held in an axial direction. CONSTITUTION:A clutch body 1 is constituted with a plate part 4 formed into about a triangular platelike state and a housing part 6 fixed on the plat part 4 with a plurality of pieces of fixing screws 5, the plate part 4 is connected by a spline 7 provided in a central hole by cutting with a rotating shaft 2 and a rotating component 3 is fitted in the housing part 6 rotatably. Cam faces 10 with which two pieces of rollers 9a, 9b are come into contact as a plurality of pieces of rolling members held in an axial direction are formed respectively on three pieces of cams which are provided on the plate part 4 in the circumferential direction of the same at equal intervals and confronting with the external circumferential surface of the rotating component 3 and these rollers 9a, 9b are held between the cam faces and rotating component 3.

Description

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

[Conventional technology]

A one-way clutch is a clutch that has the function of transmitting torque only when rotating in the forward direction.In recent years, with the development of various industrial machinery to become labor-saving, faster, and more efficient, its application fields have expanded and become important. It is 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, one-way clutches used in kick-type starters for motorcycles and glue-coil starters for general-purpose equipment connect members rapidly, and instantaneously transmit the power of the kick crank or starting lobe to the crankshaft. required to do so.

[Problem that the invention seeks to solve]

However, conventional one-way clutches of this type have a problem in that the members cannot always be quickly connected. This is because various processing errors occur during processing,
This is because it becomes extremely difficult to process the cam surface with high precision. That is, in cutting, a workpiece to be cut is elastically deformed due to cutting resistance, resulting in machining errors, and in press working, etc., springback and the like cause errors. Therefore, the contact area between the rolling elements and the cam surface becomes small, making it impossible to instantaneously obtain the frictional force necessary for power transmission.

[Means for solving problems]

The present invention was made in view of these circumstances, and provides a one-way clutch that can be rapidly engaged. In the one-way clutch according to the present invention, the clutch body is composed of a plate portion provided with a cam portion with which the rolling elements engage, and a housing portion fixed on the plate portion and holding the rolling elements together with the cam portion. A plurality of the rolling elements are held in the axial direction.

[Operation] In the present invention, the contact area between the cam surface and the rolling elements is reduced by separating the clutch body into a plate part that requires strength and a housing part that does not require as much strength, and holding a plurality of rolling elements. Make it thicker.

〔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 with a part of the lid broken away, Fig. 2 is a sectional view taken along the line n-ng in Fig. 1, and Fig. 3 is a sectional view taken along line 11 in Fig. 1. In the figures, the reference numeral 1 in these figures indicates a clutch body, to which a rotating shaft 2 on the driven side is coupled from one side, and a rotating member 3 on the driving side is rotatably fitted from the other side. are combined.

The clutch body 1 is composed of a plate portion 4 formed in a substantially triangular plate shape, and a housing portion 6 fixed to the plate portion 4 with a plurality of fixing screws 5.
The plate portion 4 is connected to the rotating shaft 2 through a spline 7 formed in a central hole, and the rotating member 3 is rotatably fitted into the housing portion 6.

Reference numeral 8 designates three cam portions that are provided on the plate portion 4 at equal intervals in the circumferential direction and face the outer peripheral surface of the rotating member 3. Each of these cam portions 8 is formed with a cam surface 10 that engages two rollers 9a and 9b as a plurality of rolling elements held in the axial direction. It is held in between. In this embodiment, the plate portion 4 is formed from a processed sheet metal material. Cam part 8
is integrally erected on the plate portion 4 by bending one end of the tongue-like piece outward and then bending it inward. By this bending process, the cam portion 8 is formed at the corner 10a of the cam surface 10.
is recessed in an arc shape to ensure engagement with the roller 9a, and is inclined so as to gradually approach the outer circumferential surface of the rotating member 8 in the rotational direction of the rotating member 3. The diameter of the roller 9a is
Considering the springback of the bending process, the outer opening ~
It is set slightly smaller than 9b.

The housing portion 6 is made of a resin material, a metal material such as aluminum, and is formed into a circular ring shape having a central hole into which the rotating member 3 is fitted. At positions corresponding to the three cam surfaces 10 of the housing portion 6, three recessed portions 11a and Ilb are provided which form spaces Sa and Sb for rotatably holding the rollers 9a and 9b together with the cam portion 8. has been done.

These concave portions 11a and llb are opened on both sides of the housing portion 6 with a partition wall provided in the middle, as shown in FIG. 4, and are fixed to the plate portion 4 after the rollers 9a and 9b are loaded. It is covered with a plate-shaped lid 13 fixed to the housing part 6 with screws 12. That is, the one-way clutch connects the plate portion 4 of the clutch body 1 and the rotating member 3 to the spaces Sa, Sb formed between these members.
They are configured to be connected via rollers 9a, 9b held within.

The concave portions L1a and 11b are bulged out so that the opening edges are close to each other, and the opposing distances La and Lb are equal to the roller 9a.
, 9b. For this reason,
The rollers 9a and 9b do not fall off even when the rotating member 3 is not fitted.

20a, 20b are connected to the roller 9 through the cap 21.21.
These spring loading grooves are loaded with springs 22 and 22 that press a and 9b. a2r) a.

20b are opened in one side of the housing part 6 and in the recesses 11a and 11b, respectively, for die cutting. A fifth
As shown in the figure, the undercut portion 2 bulges inward.
3 is provided, and the spring 22, gear, and bush 21 are held so that they do not pop out.

In the one-way clutch 7 configured in this way, when the rotating member 3 is driven in the six directions of the arrows, this power is transmitted from the cam part 8 to the plate part 4 via the rollers 9a and 9b, and the rotating member 3 is rotated. Shaft 2 is driven. That is, power is transmitted by the plate part 4, and the housing part 6 functions as a member that holds the rollers 9a, 9b on the vehicle.

Therefore, the clutch body 1 can be separated into a portion where strength is required and a portion where strength is not required. Therefore, the housing portion 6, which does not require strength, can be formed from a material that is easy to process.

Further, since a plurality of rollers 9a, 9b are held in the axial direction, each roller 9a, 9b can intervene between the rotating member 3 and the cam surface 10 depending on the facing distance between these members. Therefore, even if the cam surface 10 is not machined with high precision and the facing distance between the rotating member 3 and the cam surface 10 changes in the axial direction, the respective rollers 9a.

9b is at least partially engaged with the cam surface 10 and the rotating member 3.

Therefore, since the number of contact areas can be increased and the contact area can be increased compared to the conventional case where only one rolling element is used, the frictional force can be increased and the friction necessary for transmitting power when the rollers 9a and 9b are engaged is increased. You can gain power instantly.

As described above, the present invention aims to increase the frictional force by increasing the number of contact parts of the rolling elements by holding a plurality of rolling elements in the axial direction. The invention is not limited to one in which the cam part is formed from a processed sheet metal material and the cam part is bent. For example, the plate portion and the cam portion may be integrally formed by sintering, forging, or casting, or other modifications may be made as appropriate. In addition, we explained an example in which the diameters of each roller were different.
Similar effects can be obtained even with rollers having the same diameter.

〔Effect of the invention〕

As explained above, according to the present invention, the clutch body is
It is composed of a plate part provided with a cam part with which the rolling element engages, and a housing part fixed on the plate part and holding the rolling element together with the cam part, and holds a plurality of the rolling elements in the axial direction. Therefore, the contact area between the cam surface and the rolling element can be increased by increasing the number of contact areas between the cam surface and the rolling element.

Therefore, since the frictional force necessary for power transmission is obtained, slippage can be prevented and rapid connection can be achieved.

[Brief explanation of drawings]

FIG. 1 is a front view showing a one-way clutch according to the present invention with a part of the cover broken away, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1,
Figure 3 is a sectional view taken along the line -■ in Figure 2, and Figure 4 is a cross-sectional view of I in Figure 1.
FIG. 5 is a sectional view taken along the line V--TV in FIG. 4. 1...Clutch body, 2...Rotating shaft, 3...
- Rotating member, 4... plate part, 6... housing part, 8... cam part, 9a. 9b --- Cola.

Claims (1)

[Claims] In a one-way clutch that connects a clutch body coupled to a rotating shaft and a rotating member through rolling elements held in a space formed between these members, the clutch body is connected to a cam with which the rolling element engages. Consisting of a plate part provided with a cam part having a surface, and a housing part fixed on the plate part and holding a rolling element together with the cam part,
A one-way clutch in which a plurality of the rolling elements are held in the axial direction.