Patent ID: 6736036
Filing Date: 2004-05-18
Classification: F16H,Y10T

Abstract:
A rotary assembly for traction drives, said rotary assembly comprising a plurality of rolling elements having a rotation axis and traction contact surfaces around the rotation axis and associating with each other to transmit a motive power between the rolling elements via a traction oil film formed between the traction contact surfaces, at least one of said traction contact surfaces having a microstructure with irregularities which sizes are larger than a thickness of the traction oil film, said traction contact surface being formed by a process, said process comprising:subjecting a surface of the rolling element to shot peening to form recesses and projections therein; and subsequent to the shot peening, machining the projections by either one of lapping, mirror polishing, super finishing, cutting and grinding to form the top-flat lands and thus produce the traction contact surface.