Chain guide structure for chain drive type transmission mechanism

摘要

A chain guide structure for a chain drive type transmission mechanism which ensures that even when a solid matter, such as a small stone, gets nipped and a strong impact is exerted on a chain guide, the chain guide deforms so as to absorb the impact and permit the small stone or the like to be swiftly eliminated. The chain guide fastened to the engine case is provided so as to cover a drive chain wound around a drive sprocket, at a part of the periphery of the drive sprocket and in an arcuate form. The chain guide is formed with a brittle portion lower in strength than other portions thereof. The brittle portion is located above and in the vicinity of a front end portion at which the chain guide is situated closest to the drive chain. Thus, an engine case can be protected from damage.

主权项

1. A chain guide structure for a chain drive transmission mechanism comprising:
a drive chain for transmitting motive power, the drive chain being looped around and between a drive sprocket and a driven sprocket, the drive sprocket being fitted to an output shaft protruding outside from an engine case of an internal combustion engine mounted on a vehicle, the driven sprocket being provided on a side of a rear wheel; a chain guide fastened to the engine case is provided for covering the drive chain wound around the drive sprocket, at a part of a periphery of the drive sprocket and in an arcuate form; and said chain guide being formed with a brittle portion lower in strength than other portions thereof, the brittle portion being located in an upper vicinity of a front end portion at which the chain guide is situated closest to the drive chain.