CHAIN FOR POWER TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To improve wear resistance even under high contact pressure. SOLUTION: Shaving is performed for a pin hole 22 of a link plate 2 in a silent chain. A carbide layer which is mainly made of vanadium carbide and contains small quantity of chromium carbide is formed on a topmost surface part of steel to be a base material of a connecting pin 3. A boundary layer in which contents of vanadium carbide is rapidly reduced and contents of chromium carbide is rapidly increased is formed in a boundary region between the carbide layer and the base material. In this case, partial loading of the pin hole 22 and the connecting pin 3 can be prevented by shaving of the pin hole 22. Since the carbide layer formed on the topmost surface part of the base material is mainly made of vanadium carbide, generation of peeling from a surface layer of the carbide layer can be prevented. Since the boundary layer between the carbide layer and the base material contains comparatively large quantity of chromium, coupling property of the carbide layer and the base material is improved and peeling of the carbide layer from the base material can be prevented.