Tsubakimoto Chain Company

Arimasa Kaga

Kazuhiko Shimaya

In a roller chain, the outside diameters D of the rollers and the outside diameters d of the pins extending through bushings on which the rollers are disposed satisfy the relationships 0.72P&#x2266;D&#x2266;0.79P and 0.40P&#x2266;d&#x2266;0.44P where P is the pitch of the roller chain. The height H of the inner plates of the chain satisfies the relationship 0.96P&#x2266;H. The elongation ratio of the chain is significantly reduced, and improvements in breaking strength of the pin and in the rotational fatigue of the chain are realized. Consequently wear resistance, strength, and endurance of the chain are significantly improved, making the chain suitable for use as a timing chain in an engine that rotates at high speed.

Roller chain

In order to provide a timing mark at a specific place on part of a timing chain in a manner in which the quality of the timing chain is maintained, a timing chain 4, made endless by outer plates 1 and inner plates 2 being connected by means of connecting pins 3 is provided with a timing mark 1' at a specific part on one side of an outer plate 1. The timing mark 1' is placed on the outer plate 1 between the connecting pins 3 and is in the shape of a web extending from an inner edge of the outer plate 1 to an outer edge thereof. The timing mark 1' is provided by baking a coating on the outer plate 1 after the timing chain has been assembled.

Growing community of inventors

Osaka, Japan

Arimasa Kaga