JPS63214566A - Sprocket - Google Patents

Abstract

PURPOSE:To aim at enhancing the durability of a resilient member and at reducing the thickness thereof by forming the outer peripheral part of the resilient member so as to have an wave-like external shape as viewed in the side view thereof in conformity with the shape of a link plate in a chain. CONSTITUTION:Each link plate 6a in a chain 6 makes uniformly contact with the outer peripheral part of a resilient member 13 having a wave shape in its entirety so as to uniformly deform the resilient member 13. Due to the deformation of the resilient member 13 impacts which occur during meshing between a sprocket 3 and the chain 6 may be effectively and uniformly absorbed and damped. Thus, with the result of the uniform deformation of the resilient member 13, the distribution of compressive stress produced in the resilient member 13 may be made to be uniform, and the absolute value of the compressive stress may be entirely reduced so that the resilient member 13 may be prevented from being eccentrically worn while it is possible to aim at enhancing the durability thereof. As a result, the resilient member 13 may be made thin.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sprocket that uses an elastic body to absorb and alleviate shock and noise generated when the sprocket engages with a chain.

(Prior Art) As shown in FIG.
As shown in FIG.
16 is provided protrudingly, and a ring-shaped elastic body 2 is provided on the outer periphery of the hub 216.
13 (see Japanese Utility Model Publication No. 54-45485) is known.

(The heat problem that the invention attempts to solve) However, in the sprocket shown in FIG. Since the elastic body 113 is in local contact with the elastic body 113 only at the hatched part, the impact absorption effect of the elastic body 113 is small, and the abrasion of the first elastic body 113 at the part a (contact part) shown in the figure is significant, and the durability of the elastic body 113 is reduced. There is a problem of decreased sexuality.

In addition, for the sprocket shown in Fig. 6, the chain 2
Since the portion 206a-1 of each link plate 206a of 06 with the bottle 215 hits the elastic body 213 first and leaves the elastic body 213 last, local wear of the elastic body 213 can be avoided. Does it need to be thicker overall?

The present invention has been made in view of the above-mentioned problems, and its object is to provide a sprocket that can prevent uneven wear of the elastic body, improve durability, and reduce the thickness of the sprocket.

(Means for Solving the Problems) In order to achieve the above object, the present invention comprises a ring-shaped elastic body fixed to the side of a main body having a plurality of teeth formed on the outer periphery to mesh with the chain. The sprocket is characterized in that the outer circumferential shape of the elastic body is formed into a waveform in side view in accordance with the shape of the link plate of the chain.

(Function) Since the link plate of the chain uniformly contacts the elastic body and deforms the elastic body uniformly, uneven wear of the elastic body is prevented, improving its durability and reducing its thickness. It will be done.

(Example) An example of the present invention will be described below based on the accompanying drawings.

First, an overview of a motorcycle that employs the sprocket according to the present invention in its power transmission system will be explained based on FIG. , a transmission, and an endless chain 6 is wound between a small diameter sprocket 3 connected to the end of the output shaft of the transmission 2 and a large diameter sprocket 5 connected to the boss part of the rear wheel 4. It is being

The rotational power of the engine 1 is transmitted to the sprocket 3 via the mission 2, and the rotation of the sprocket 3 is transmitted to the sprocket 5 via the chain 6, and together with the sprocket 5, the rear wheel 4 is rotationally driven. A two-wheeled vehicle is forced to run. As shown in the figure, an air cleaner 7 and a carburetor 8 are connected to the intake system of the engine 1, and an exhaust pipe 9 is connected to the exhaust system. Also, in Figure 4, l
O is a front wheel, and 11 is a fuel tank.

Here, details of the sprocket 3 will be explained based on FIGS. 1 to 3. 1 is a half-cut sectional view of the sprocket 3, FIG. 2 is a sectional view taken along the line n--■ in FIG. 1, and FIG. 3 is a side view showing the sprocket 3 in use.

The sprocket 3 is constructed by baking ring-shaped elastic bodies 13.13 onto both sides of a main body 12 having a plurality of teeth 12a on the outer periphery. That is, a plurality of (five in the illustrated example) circular holes 12, b, etc. are bored on the same circumference of the main body 12, and both elastic bodies 13, 13 are provided with circular holes 12, b, and so on. They are connected and integrated by the filling columnar elastic bodies 14--. The outer diameter of each elastic body 13 is equal to the tooth 1 of the main body 12.
The diameter of the tooth bottom of the chain 6 is smaller than the diameter of the tooth bottom of the chain 6 shown in FIG. The convex portions 13a and the concave portions 13b are continuous alternately.

3, when the chain 6 is in use as shown in FIG. The elastic body 13 is uniformly deformed by contacting the elastic body 13 uniformly. That is.

The portion 6a-1 of the link plate 6a with the pin 15 engages with the recess 13b on the outer periphery of the elastic body 13, and the portion 6a-2 without the pin 15 engages with the convex portion 13a on the outer periphery of the elastic body 13. There is. The deformation of the first elastic body 13 effectively absorbs and alleviates the impact generated when the sprocket 3 engages with the chain 6.

As a result of each elastic body 13 being uniformly deformed as described above, the distribution of the compressive stress generated in the elastic body 13 becomes uniform, and the absolute value of the compressive stress decreases overall, thereby preventing uneven wear of the elastic body 13. , its durability is improved. Further, as a result of improving the durability of the elastic body 13 in this way, the elastic body 13 can be made thin.

Incidentally, although only one sprocket 3 has been described above, the other sprocket 5 is also constructed in the same manner, and the same effects as described above can be obtained.

(Effects of the Invention) As is clear from the above description, according to the present invention, the outer circumferential shape of the ring-shaped elastic body fixed to the side of the sprocket body is shaped into a waveform in side view in accordance with the shape of the link plate of the chain. Because of the structure, the elastic body is deformed uniformly,
The effect of preventing uneven wear of the elastic body, improving its durability and making it thinner can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a half-cut sectional view of a sprocket according to the present invention, and FIG.
The figure is a sectional view taken along the If-n line in Figure 1, Figure 3 is a side view showing how the same sprocket is used, Figure 4 is an overall side view of the motorcycle, and Figures 5 and 6 are of a conventional sprocket. FIG. 3 is a side view showing the state of use. 3.5- Sprocket, 6... Chain, 6 a
-Link plate, 12-... Sprocket body. 12a...teeth, 13-...elastic body.

Claims (1)

[Claims] In a sprocket comprising a ring-shaped elastic body fixed to the side of a main body having a plurality of teeth formed on the outer periphery to mesh with the chain, the shape of the outer periphery of the elastic body is matched to the shape of the link plate of the chain. A sprocket characterized by having a waveform in side view.