Chain guide

Abstract

A chain guide is provided, which can readily achieve, with a simple structure, both favorable attachability and tightness of a guide shoe relative to a base member, even though the base member has side wall ribs on both left and right side edges. A base member of a chain guide includes an upstream engagement portion and downstream engagement-portions, while a guide shoe includes an upstream hook and downstream hooks. Downstream engagement portions include restricting portions. The downstream hooks are hooked to the downstream engagement portions from an outer side in a guide width direction by twisting and elastically deforming the guide shoe in a state where the upstream hook is engaged with the upstream engagement portion.

Description

technical field [0001] The invention relates to a chain guide comprising: a guide block for slidingly guiding a moving chain; and a base member for supporting the guide block along the length direction of the guide. Background technique [0002] Conventionally, it is known that a chain guide installed in a timing system in an automobile engine room slides and guides a chain moving between sprockets and appropriately maintains chain tension (for example, refer to Patent Document 1). [0003] The chain guide described in this patent document 1 is composed of a guide block for slidingly guiding a moving chain and a base member for supporting the guide block, and a plurality of buckle portions formed on the guide block are engaged with the engaged portions of the base member , so that the guide block is detachably mounted on the base member. [0004] In addition, among such chain guides, techniques are also known for realizing stable sliding contact motion of the chain by restr...

AI Technical Summary

Problems solved by technology

[0010] However, in the chain guide described in Patent Document 2, both the direction in which the protrusion on the rear side of the guide block is attached to the recessed portion to be fitted and the direction in which the protrusion on the rear side of the guide block is restricted from moving by the recessed portion to be fitted are two. The direction is the length direction of the guide, so there is a problem that it is difficult to simultaneously realize the problem that the protrusion on the back side of the guide block is easily installed in the mated recess and is difficult to fall off.

[0011] That is, in order to ensure easy installation of the protrusion on the rear side of the guide block in the engaged recess, it is preferable to design such that, in the state where the protrusion on the rear side of the guide block is inserted into the recess to be engaged, the upper side of the protrusion on the rear side of the guide block A certain amount of chatter occurs between the end face and the upstream end face of the mated recess, but conversely, if the chatter is designed to be large, the protrusion on the back side of the guide block will easily fall off from the mated recess

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