JPH03107624A - One-way clutch - Google Patents

Abstract

PURPOSE:To simplify structure and reduce manufacturing cost by connecting a plural number of clutch pieces by a connecting arm, and forming circular arc faces for engaging on body sides of inside and outside peripheries of a clutch piece. CONSTITUTION:A clutch 1 is interposed between an outer ring 9 which also serves as a case and a shaft 10, and a lid plate 11 prevents coming off. The clutch 1 mounts the shaft 10 having a slightly larger diameter than an inscribed circle diameter of a clutch piece 2 by forcibly fitting on its inside. A connecting arm 3 is deformed in the condition where the clutch 1 and shaft 10 are mounted, the clutch piece 2 is press-fitted to the shaft 10 in the condition where pre-load is applied, and the clutch 1 is connected with the shaft 10 integrally. Next, when an outer ring 9 rotates in the C direction to the shaft 10, a circular arc face 4 of the clutch piece 2 and an inside peripheral face of the outer ring 9 slide and contact. Therefore, the shaft 10 and outer ring 9 rotate freely. When the outer ring 9 rotates in the opposite direction, circular arc faces 4, 5 engage respectively with the inside peripheral face of the outer ring 9 and the surface of the shaft 10 to integrate both because distance l1 between A and B is larger than the distance l2 between the outer ring 9 and the shaft 10.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a one-way clutch.

[Conventional technology]

Clutches that cut off and transmit rotational force in one direction are often used in the rotation transmission parts of office equipment such as facsimiles and copy machines. Something with structure is required.

Conventionally, in order to meet such demands, a clutch has been proposed, as shown in FIG. 6, in which a resin spring for biasing the rollers to a neutral position is integrally formed in the presser cover. In this clutch, rollers 22 are engaged between an outer ring 21 and a shaft inserted inside the outer ring, and the clutch is engaged, and the rollers 22 are returned to a neutral position by the elastic force of a resin spring 24, thereby disengaging the clutch. ing.

[Problem to be solved by the invention]

However, in order to function as a clutch, the one-way clutch with the above proposed structure requires at least four types of parts: the outer case 20, the outer ring 21, the rollers 22, and the presser cover 23, and all of these parts are small parts. Therefore,
The disadvantage is that it takes time and effort to assemble.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a one-way clutch that can be integrally molded from synthetic resin and can be formed at low manufacturing cost.

[Means to solve the problem]

In order to solve the above problems, the present invention consists of a plurality of clutch pieces that are integrally molded from flexible synthetic resin and a connecting arm that connects the clutch pieces in an annular shape. and the outer diameter side surface are each formed into a circular arc surface, and the radius of curvature of the circular arc surface of the outer diameter side surface is set to be smaller than the radius of the circumscribed circle connecting the maximum diameter part of the circular arc surface and the center of the clutch, and the above-mentioned maximum It has a structure in which the line connecting the diameter part and the minimum diameter part of the circular arc surface of the inner diameter side surface is inclined in the circumferential direction with respect to the line connecting the center of the clutch and the maximum diameter part or the minimum diameter part. be.

In addition, in the above structure, it is desirable to set the inclination angle θ between the line connecting the maximum diameter part and the minimum diameter part and the line connecting the clutch center and the maximum diameter part or the minimum diameter part in the range of 3 to 12 degrees. .

(Function) A clutch with the above structure has a shaft with a diameter larger than the circumscribed circle diameter of each clutch piece, or a shaft with a diameter smaller than the circumscribed circle diameter of each clutch piece on the outside of the clutch. The clutch and the shaft or outer ring are integrally connected by forcibly fitting the outer ring.

In this state, the distance between the maximum diameter part and the minimum diameter part of the inner and outer diameter sides of the clutch piece becomes larger than the distance between the shaft and the outer ring by the amount that the line connecting the two is inclined in the radial direction. Therefore, when the shaft and the outer ring rotate relative to each other in a direction opposite to the inclination direction, the clutch piece that rotates together with the shaft or the outer ring gets caught between the shaft and the outer ring, thereby integrating the two.

Conversely, when the outer ring and the shaft rotate relative to each other in the above-mentioned inclined direction, the clutch pieces slide relative to the outer ring or the shaft, so that the outer ring and the shaft rotate freely.

〔Example〕

The clutch 1 of the embodiment shown in FIGS. 1 to 3 consists of a plurality of clutch pieces 2 arranged in an annular shape and a connecting arm 3 that connects each of the clutch pieces 2, and is made of flexible synthetic resin. It is integrally formed by.

The clutch piece 2 is a strip having a substantially rectangular cross section, and its inner diameter side surface and outer diameter side surface are respectively formed into arcuate surfaces 4.5 that are convex outward.

Of these arcuate surfaces 4.5, the radius of curvature of the outer diameter side of the arcuate surface 4 is set smaller than the circumscribed circle radius (D/2) connecting the maximum diameter part B of the arcuate surface 4 and the clutch center O. The arcuate surface 4 contacts the circumscribed circle 6 passing through its maximum diameter portion B at one point.

Further, a line 7 connecting the maximum diameter portion B of the arc surface 4 and the minimum diameter portion A of the arc surface 5 is inclined in the circumferential direction with respect to a line 8 connecting the clutch center 0 and the minimum diameter portion A. There is. In this case, the inclination angle θ between the lines 7 and 8 is a factor that determines the state of engagement between the clutch 1, the outer ring, and the shaft, and its optimum value is in the range of 3 to 12 degrees.

On the other hand, the connecting arm 3 is formed into a band shape with a narrow width in the radial direction, and has a shape-retaining force that arranges the clutch pieces 2 in an annular shape, and can be elastically deformed in the direction of moving the clutch pieces 2 toward and away from each other. It has a certain amount of elasticity.

The clutch 1 having the above structure is, as shown in FIG.
It is fitted between an outer ring 9, which also serves as an external case, and a shaft 10, and is used with a cover plate 11 preventing it from being pulled out.

In this case, the clutch 1 is installed by forcibly fitting a shaft 10 with a diameter slightly larger than the inscribed circle diameter d of the clutch piece 2 inside the clutch 1, as shown in FIG.
When the clutch 1 and the shaft 10 are attached in this way, the connecting arm 3 is deformed and the clutch piece 2 is pressed against the shaft 10 with preload applied, and the clutch 1 is attached to the shaft 10.
0 and is integrally connected.

In the above mounting state, the outer ring 9 is aligned with the axis 10 at a line 7.
When rotated in the direction of inclination (arrow C), the arc surface 4 of the latch piece 2 and the inner diameter surface of the outer ring 9 come into sliding contact, so that the shaft 10 and the outer ring S rotate freely.

Contrary to the above, when the outer ring 9 rotates in the opposite direction to the inclination direction, the distance between AB is the distance l between the outer ring 9 and the shaft 10! , is larger, the arcuate surface 4.5 meshes with the inner circumferential surface of the outer ring S and the surface of the shaft 10, thereby integrating the two.

In the above embodiment, the clutch 1 and the shaft 10 are forcibly fitted to be integrated. It is also possible to have a structure in which the two are forcibly fitted to integrate the two. In this case, the circular arc surface 5 on the inner diameter side of the clutch piece 2 is connected to the shaft 10.
The clutch contacts and engages the circumferential surface of the clutch to switch the clutch.

Further, in the above embodiment, an example was shown in which the clutch 1 is used alone, but if it is necessary to transmit a large amount of rotational torque, a plurality of clutches may be used between the outer ring 9 and the shaft 10 depending on the rotational torque. Each time you incorporate 1, it becomes easier to deal with the problem.

〔Effect of the invention〕

As explained above, the present invention connects a plurality of clutch pieces with a connecting arm, and has a
Since it has a circular arc surface for engagement, it can function as a one-way clutch simply by installing it between the shaft and the outer ring. Therefore, the clutch structure can be significantly simplified compared to a conventional structure that includes rollers and a presser cover, and manufacturing costs can be significantly reduced.

[Brief explanation of drawings]

Fig. 1 is a front view showing the one-way clutch of the embodiment, Fig. 2 is a front view showing its main parts, Fig. 3 is a side view of the same, and Fig. 4 is a front view showing the one-way clutch of the embodiment.
FIG. 5 is a front view showing the installed state of the same as the above, and FIG. 6 is a perspective view of the conventional example. 1... Clutch, 2... Clutch piece, 3... Connecting arm, 4... Arc surface, 5... Arc surface, 6 ......Circumcircle, 7.8...Line, 9...Outer ring, 10...Axis, 11...
Cover plate, A...Minimum diameter part, B...Maximum diameter part, 0...Clutch center.

Claims (2)

[Claims] (1) Consists of a plurality of clutch pieces that are integrally molded from flexible synthetic resin and a connecting arm that connects the clutch pieces in an annular shape, with the inner diameter side and outer diameter side of each clutch piece having circular arc surfaces. The radius of curvature of the circular arc surface on the outer diameter side surface is set to be smaller than the radius of the circumscribed circle connecting the maximum diameter part of the circular arc surface and the center of the clutch, and A one-way clutch in which a line connecting the minimum diameter part of the clutch is inclined in the circumferential direction with respect to a line connecting the center of the clutch and the maximum diameter part or the minimum diameter part. (2) Set the inclination angle θ between the line connecting the maximum diameter part and the minimum diameter part and the line connecting the clutch center and the maximum diameter part or the minimum diameter part to 3 to
The one-way clutch according to claim 1, wherein the one-way clutch is set within a range of 12 degrees.