Patent ID: 7387584
Filing Date: 2008-06-17
Classification: F16H,Y10S

Abstract:
1. A drive belt pulley comprising: a hollow cylindrical pulley body around which a drive belt is to be wrapped; a hollow cylindrical shaft member that rotatably carries the pulley body; a support rod that is inserted in the shaft member and has a smaller diameter than the hole of the shaft member; and an elastic body that elastically supports the shaft member, together with the pulley body, to the periphery of the support rod, wherein the elastic body is provided to constrain the shaft member to the support rod with a higher degree within a quarter of the periphery of the support rod that is located, when viewed along the axis of the shaft member, forward of the line of action of a radial shaft load on the shaft member with respect to the direction of rotation of the pulley body than within the rest of the periphery of the support rod, and when the drive belt deviates to one side of the pulley body, the one side of the pulley body moves toward the direction of the radial shaft load and concurrently moves forward in the travel direction of the drive belt relative to the other side with a portion of the shaft member, acting as a fulcrum, relatively strongly constrained to the support rod and the pullet body is positioned obliquely relative to the drive belt.