chain drive

Abstract

The invention provides a chain transmission device. That a resin guide block is softened due to friction heat generated when an outer connecting piece and an inner connecting piece of a chain are in slide contact is prevented, and frictional loss and energy consumption are reduced, at the same time, the durability of the resin guide block is improved, and noise generated when the chain enters and breaks away from a chain guiding member is reduced. Specifically, the chain (101) is in slide contact with a movable guiding block (131) at a chain loose side, and the chain is in slide contact with a fixed guiding block (141) at a tensioning side. A motion face of at least one of the movable guiding block (131) and the fixed guiding block (141) is made of a synthetic resin. The outer connecting piece (110) of the chain (101) is only in slide contact with the motion face (133) of the movable guiding block or the motion face (143) of the fixed guiding block, and the inner connecting piece (120) is only in slide contact with the other motion face.

Description

technical field [0001] The invention relates to a chain transmission device, which is provided with a movable guide piece and a fixed guide piece which are in sliding contact with the chain passing over the sprocket group. The chain transmission is, for example, a timing chain transmission provided in an automobile engine. Background technique [0002] The existing chain transmission device has: a chain, which is flexibly connected with an outer connecting piece and an inner connecting piece adjacent in the length direction; a sprocket group, which is passed by the chain; The chain is in sliding contact; and the fixed guide is in sliding contact with the chain on the tensioned side of the chain. [0003] Moreover, a chain transmission device in which only the inner link of the chain is in sliding contact with the movable guide and the fixed guide is known (for example, refer to Patent Document 1), and only one of the inner link and the outer link of the chain is also known....

AI Technical Summary

Problems solved by technology

At this time, among the guides, if the guide shoe on which the moving surface of the chain sliding contact is formed is made of synthetic resin, the guide shoe may soften due to the temperature rise caused by frictional heat.

Moreover, when the guide block softens, since the sliding resistance acting on the chain becomes larger, the friction loss on the chain increases, the power loss of the power source (such as an engine) used to drive the chain transmission increases, and there is an increase in the energy consumption rate. problem, and there is a problem that the wear of the guide block increases and the durability of the two guides decreases

[0011] And, at the entry-side end and the exit-side end of each guide, since the motion state of the chain is unstable compared with the central portion of each guide, the chain tends to be unstable, and the instability caused by this error occurs. steady noise

And, when only one side of the inner link and the outer link of the chain is always in sliding contact with the entering side end and the leaving side end, there is a periodic noise peculiar to the inner link or the outer link (hereinafter referred to as "Periodic noise") becomes larger

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