JPS6081538A - Chain - Google Patents

Abstract

PURPOSE:To improve the durability and at the same time contrive to reduce the friction loss by a method wherein at least one overlapped part of the respective link plates is coated with coating material, the friction coefficient of which is smaller than that of the link plates 10 and 11 themselves. CONSTITUTION:The overlapped parts 10a and 11a of link plates 10 and 11 are coated with coating material, the friction coefficient of which is smaller than that of the link plates 10 and 11 themselves (such as molybdenum base of fluorine base coating material when the link plates 10 and 11 are of steel). In addition, the respective tooth parts 2a and 4a of sprockets 2 and 4 are also coated with the coating material 13, the friction coefficient of which is smaller than that of tooth parts 2a and 4a themselves. Consequently, the friction loss developed by the relative sliding motion between the link plates 10 and 11 are reduced and at the same time the improvement of durability of the plates 10 and 11 and sprockets 2 and 4 can be contrived.

Description

[Detailed description of the invention] The present invention provides IUI to the chain.

In motorcycles, a chain is used to transmit power between the crankshaft and the cam 1h or the output shaft of the engine and the rear wheel 11. Top dd place t here I11! Use 1. When a chain is used, an excessive load may be applied during sudden acceleration or deceleration, and it is required that the chain be able to withstand the heat and load that is repeatedly applied. Conventionally, in order to satisfy the above-mentioned conditions, the surface of each link plate is hardened and reinforced by chrome plating or heat treatment, thereby improving the durability of the chain.

However, with such a conventional chain, although some consideration has been given in terms of durability, no consideration has been given to the loss of friction caused by the mutual sliding of each link plate. Therefore, the sliding movement of these link plates was one of the causes of power loss during power transmission.

The present invention has been made in view of the above circumstances, and it not only improves durability, but also reduces the friction loss caused by sliding of each link plate to remove insects, and keeps power loss low. The purpose of this chain is to provide a chain with minimal overlap between each link plate (one of which is coated with a coating material that has a coefficient of early friction that is smaller than the coefficient of friction of the link plates themselves). It is in.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. A sprocket 2 is fixed to l. On the other hand, an intermediate shaft 11h3 is arranged parallel to the crankshaft 1 in the upper part of the crank 1111, and this intermediate shaft 3
A sprocket 4 is fixed to. A silent chain 5, which is formed as an annular band as a whole as shown in FIGS.
is linked to. Thus, the camshaft 8 crankshaft I
The first
In the figure, 9 indicates a chain tensioner.

The silent chain 5 has two persimmon type link plates 10.1 with different shapes as shown in FIG.
1 are interlocked parts that are pivotally connected via pins 12, and are characterized by generating less noise than roller chains.

Plate 1 located on both outer sides of the link plates
0 is formed into a substantially fan-like shape as shown in FIG.
As shown in FIG. 2, the sprocket 2.4 has a generally fan-shaped shape similar to the plate 10, and the teeth 2a, 4 of the sprocket 2.4.
Both link plates 10 have a shape in which the center of the lower part is notched upward so that they can mesh with a.
．． The portions 10a and lla of 11 that form 6c claws are smaller than the *m coefficient of link play 1-10.11 itself.
Coating material 13 having a friction coefficient (for example, if the link plate 7.8 is made of M, a molybdenum-based or fluorine-based coating material is used.) The friction coefficient of the coating material is 0.04 to 0.06). Also, each tooth portion 2a of the sprockets 2 and 4.

4a is also coated with a coating material 13 having a coefficient of friction smaller than the coefficient of friction between the two parts t4i52a and 4a.

Therefore, according to the chain structure of the above 11i:, 41j, the link plates 10, 1st U overlap each other 10a
.

11af, the same link plates to, ii are coated with a coating material 13 having a coefficient of friction smaller than that of themselves;
It is possible to reduce the wear loss associated with sliding, and in turn, it is possible to suppress the power loss to a low level, and it is also possible to improve the durability.

In addition, in this embodiment, link plate 10.1
1 as well as the tooth portions 2a and 4a of the sprockets 2 and 4 are coated with a coating material 13 having low repulsion, which reduces the friction loss that occurs between the teeth when the tooth meshes with the sprockets 2 and 4. Therefore, power loss can be further reduced.

Figures 5 to 7 (a) and (b) show an example in which the present invention is applied to a roller chain.In other words, in this example, the eyebrow-shaped link plates 21 and 22 made of 11 steel plates are used as a roller chain. They are connected via 23f, and a bushing 24 is fitted on the outer periphery of the bottle 23. The overlapping portions 21a, 22a of each link plate 21, 22 are coated with a molybdenum-based or fluorine-based coating material 25.

Incidentally, in each of the above embodiments, both of the overlapping portions of the link plate are coated, but the present invention is not limited to this, and only one of the overlapping portions may be coated.

Further, in the above embodiment, the present invention is applied to the crank-111.
An example is described in which the chain is applied to a chain that is wrapped around the middle + Wl shaft 3, but it is not limited to this, and can be applied to other parts such as the crankshaft 1 and the camshaft 8, or the engine output shaft. It can also be applied to a chain that is pulled between the rear axle and the rear axle. Furthermore, the invention is not limited to silent chains and roller chains, but can also be applied to other chains such as bush chains or offset chains.

As explained above, according to the present invention, 7. For example, at least one of the overlapping parts of the link plates is coated with a coating material that has a coefficient of friction smaller than the vibration damping coefficient of the four link plates themselves, which reduces friction loss caused by sliding of each link plate. In particular, when applied to silent chains with multiple overlapping link plates, it is possible to reduce power loss and improve durability.
Greater effects can be obtained.

[Brief explanation of drawings]

1 to 4 (a) and (b) each show an embodiment of the present invention, FIG. 1 is a partially cutaway 11111 side view of an engine equipped with a chain according to the present invention, and FIG. The top view of the silent chain, Figure 3 is its side view, and Figure 4 (
a), (b) respectively 1. Front view of the link plate, Figures 5 to 7 (a, l, (b) show other examples of this study, Figure 5 shows the roller chain. The plan view, Fig. 6 is a side view, and Fig. 7 (a) and tb) are front views of the link plates, respectively. l...Crankshaft, 2...Sprocket, 3... ...Intermediate shaft, 4...Sprocket, 5...Silent chain, 10.11...
...Link plate, 13...Coating material, 21.22...Link plate, 25.
...Coating material◎Applicant: Honda Motor Co., Ltd. ``Gu-・n\8 Figure 2 Figure 3 Figure 4 (Q) (b)

Claims (1)

[Claims] A chain 1 is formed by a large number of link plates overlapping each other and pivotally connected to form an annular ring 121, and is wound between a driving sprocket and a target sprocket to transmit power between the two sprockets. The chain 0 is characterized in that the overlap between the link plates is reduced (one of the link plates is coated with a coating having a coefficient of friction smaller than the coefficient of friction of the link plates themselves).