JPS633473Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a garter spring for a centrifugal clutch used in the fields of automobiles and motorcycles.

<Prior art and its problems> Garter springs, which are generally used in centrifugal clutches, are a single long coil spring formed in an annular shape, and both ends of the coil are connected by screwing together using the spiral of the spring. There are many examples where this is done.

The centrifugal clutch here uses the fact that a coil spring formed in an annular shape expands in the radial direction due to centrifugal force, and converts this expanding action into a contact action between the clutch plate and the friction plate to transmit power. A clutch with a structure that

In this case, it is ideal that the garter spring expands into a perfect circle due to the centrifugal force applied to the garter spring itself as the rotational speed increases.

However, with the garter spring of the above structure,
Since the weight of the screwed and doubled connecting part increases locally, this connecting part is pulled outward more strongly than other parts by the centrifugal force that accompanies the increase in rotational speed, causing the garter to tighten. The spring expands in a distorted shape and does not expand in a perfect circle. This tendency becomes more noticeable as the rotational speed increases.

This causes uneven contact of the clutch plates, uneven wear, and clutch slippage, which adversely affects the engagement and durability of the clutch.

<Purpose of the invention> In view of these points, the present invention is a centrifugal system in which the connecting portions of the coil springs are equally distributed at multiple locations around the circumference, so that the spread caused by centrifugal force becomes almost perfectly circular. The purpose is to provide garter springs for clutches.

<Structure and operation of the invention> The garter spring for a centrifugal clutch of the invention is
Two or more coil springs of the same length are connected in an annular shape, and both ends of the coil springs are screwed and fixed together using the threaded shape of the coils themselves.

As a result, the connecting portions of the garter spring are equally distributed at a plurality of locations around the circumference, so that the garter spring spreads out in a nearly perfect circle due to centrifugal force.

<Effects of the invention> According to the garter spring for a centrifugal clutch of the invention, two or more coil springs of the same length are connected in an annular manner and the connected parts are equally distributed, thereby reducing the garter spring's strength due to centrifugal force. Since it is configured so that the spread is almost a perfect circle,
It is possible to prevent uneven contact and uneven wear of the clutch plate, to perform smooth engagement and disconnection operations of the clutch plate, and to improve the durability of the clutch portion.

<Example> Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a garter spring. The garter spring 1 is made up of three coil springs 2 of the same length connected in an annular shape. Also,
21 is a connecting portion.

The second part showing the connecting part 21 of the coil spring 2
In the figure, the coil spring 2 consists of a large diameter portion 22 that occupies most of its total length, and a small diameter portion 23 formed at one end of this large diameter portion 22. This small diameter portion 23 is connected to the adjacent coil spring 2. It is connected by screwing into the large diameter portion 22 (other end) of. Of course, the outer diameter of the small diameter portion 23 is set to be slightly larger than the inner diameter of the large diameter portion 22.

Furthermore, in view of bonding strength and overall weight distribution, it is preferable that the screw-in dimension x is about 10 mm for a garter spring having a diameter of about 80 mm.

Note that the number of divisions of the garter spring 1 is the same as the first one above.
Although the number of divisions is not limited to three equal parts as shown in the figure, if the number of divisions is too large, there will be problems such as complicated manufacturing.

FIG. 3 shows a centrifugal clutch 10 using the above-mentioned garter spring, and the clutch storage body 4 connected to the tip of the crankshaft 3 is
A garter spring 1 is fitted into an annular recess 42 formed in the flat end surface 41, and a flange-shaped clutch plate 5 is arranged at a constant interval on an inner circumference 43.

The outer inner circumferential surface 44 of the annular recess 42 is connected to the annular bottom surface 4.
It is formed in an inclined shape from 5 toward the opening tip 46.

Further, the clutch plate 5 is provided so as to be movable in the axial direction of the crankshaft 3 with respect to the clutch storage body 4, and is always urged toward the distal end of the crankshaft 3 by the spring plate 11. A clutch plate 5 holds the garter spring 1 fitted in an annular recess 42.

On the other hand, the clutch wheel 7, which is inserted into the crankshaft 3 via the bush 6, is provided with a flange-shaped friction plate 8 on its outer circumference 71, which is fitted between the clutch plates 5 with a certain gap between them. has been done. Further, the clutch wheel 7 is linked to a transmission (not shown) via a gear 9.

Note that 12 and 13 are a clutch release and a push rod that are operated in conjunction with the change pedal when changing gears.

According to the centrifugal clutch 10 having the above structure, the garter spring 1 fitted in the annular recess 42 is connected to the clutch housing 4 connected to the crankshaft 3.
Due to the centrifugal force accompanying the increase in rotation of the annular recess 4
It slides on the outer inner circumferential surface 44 inside 2 and is pushed outward (the position shown by the chain line in FIG. 3).

Due to the expansion of the garter spring 1, the clutch plate 5 is pushed to the left in FIG. 3, contacts the friction plate 8, and rotates the clutch wheel 7.

This rotation of the clutch wheel 7 is transmitted to a transmission (not shown) via a gear 9.

[Brief explanation of drawings]

1 and 2 illustrate embodiments of the present invention, with FIG. 1 being a plan view of the garter spring, and FIG. 2 being a central end view showing the coupling portion of the coil spring;
FIG. 3 is a longitudinal sectional view showing the centrifugal clutch. 1... Garter spring, 2... Coil spring, 3... Crankshaft, 4... Clutch housing, 5... Clutch plate, 7... Clutch wheel, 8... Friction plate, 10... Centrifugal clutch.

Claims (1)

[Scope of utility model registration request] A garter spring for a centrifugal clutch is used for a centrifugal clutch and is characterized by two or more coil springs of the same length connected in a ring.