Chain guide and chain transmission device

摘要

A chain guide includes a guide base (21) disposed to face one side of a timing chain (5) that transmits torque, the chain guide having an opposed pair of side plates (22) each formed with a plurality of shaft engaging portions (25) arranged along a circular arc. Roller shafts (31) have their ends supported by the respective shaft engaging portions (25). Rollers (41) for guiding the chain are rotatably supported by the respective roller shafts (31). Noncylidrical surface engaging portions are formed on the ends of the roller shafts (31) and on closed ends of the shaft engaging portions (50) to rotationally fix the roller shafts (31), thereby preventing the roller shafts (31) from rotating under drag torque applied from the rollers (41).

主权项

1. A chain guide comprising:
a guide base including an opposed pair of side plates and elongated in one direction, wherein the guide base is configured to be arranged along a portion of an outer periphery of a timing chain such that said one direction coincides with a direction in which the timing chain moves, and wherein the side plates have shaft engaging portions; a plurality of roller shafts having ends supported by the respective shaft engaging portions and spaced apart from each other in a longitudinal direction of the side plates; and rollers rotatably supported by the respective roller shafts and configured to guide the timing chain, wherein the roller shafts have cylindrical surfaces, respectively, for rotatably supporting the rollers; wherein the shaft engaging portions have first surface engaging portions; wherein the roller shafts further have second surface engaging portions at respective ends of the roller shafts separated by the respective cylindrical surfaces thereof; wherein the second surface engaging portions of the roller shafts have non-cylindrical shapes that are complementary in shape with and engaged with the first surface engaging portions of the shaft engaging portions so as to rotationally fix the roller shafts between the opposed pair of side plates; and wherein the guide base and the roller shafts are made of different materials that have different coefficients of linear expansion.