Silent chain

Abstract

In a silent chain, connecting pins are uniformly contacted with all pin holes of inner plates to prevent the wearing between the special pin holes of inner plates and the connecting pins, and further prevent the wearing elongation of chain even though the high-load stretching tension is applied for the silent chain to bend the connecting pins. The silent chain is circular, the inner plates(4,5) with a pair of pin holes(3) in the guide row(6) and non-guide row(7) are connected to be circular by the connecting pins(10) in the pin holes(3). The connecting pins (10, 10) respectively fixed in a pair of pin holes (8) of guide plate (9) at the outermost side of guide row (6) are bent towards the direction near the central portion (10a). As greater tension is applied to the chain, the bent connecting pins become substantially straight and are brought into substantially uniform contact with pin holes (3) in the plates(4,5).

Description

technical field [0001] The present invention relates to a silent chain used in automobiles (for example, timing chains wound on cam sprockets and crank sprockets of automobile engines), power transmission and conveying equipment of industrial equipment, and the like. Background technique [0002] There is a known silent chain formed in this way: a plurality of inner plates with a pair of teeth and a pair of pin holes are respectively arranged in the guide row and the non-guide row, and the guide plates are arranged on the two outermost sides of the guide row and connected by The pins are connected in an annular shape (for example, refer to Patent Document 1.). [0003] Image 6 An example of a conventional silent chain 11 is shown. Image 6 It is an explanatory diagram of main parts of the silent chain 11 when a low-load tensile tension acts on the silent chain (initial state). With regard to the silent chain 11, inner plates 13, 14 having a pair of teeth (not shown) and a ...

AI Technical Summary

Problems solved by technology

As a result, the load acting on each inner plate is different, so there is a problem that the stress balance between the inner plates is poor, especially the stress balance between the inner plates that are not guide rows is poor.

[0007] Furthermore, since the specific inner plates 14a, 14a disposed on both outermost sides of the non-guide row 16 are intensively subjected to particularly high stress, when the silent chain 11 is wound around the sprockets and bent, there is the following problem: Excessive surface pressure is applied to the inner peripheral surface of the hole 12 and the abutting surface of the connecting pin 19, and both wear and tear, resulting in chain wear, elongation or breakage

[0008] If in order to solve the above problems, the thickness of the two outermost inner plates 14a, 14a of the non-guide row 16 is thicker than that of the other inner plates 14, then there is a problem that the quality of the silent chain itself must be increased and more materials must be used.

[0009] In addition, when the conventional silent chain 11 is used as the timing chain of the engine, due to the above-mentioned problems, there are problems in that the fuel consumption of the engine is poor, the noise performance is also deteriorated, and the environment is adversely affected. , and a high-output engine must use a high-strength, that is, a high-quality silent chain, use more materials, and have poor fuel consumption

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