Patent ID: 9702412
Date: 2017-07-11
CPC Classifications: B60K,F02B,F16D,F16H

Claim:
1. A clutched device, comprising: a clutch input member; a clutch output member; a wrap spring clutch that is engageable with the clutch input member and the clutch output member and which has a radially outer surface and a radially inner surface, wherein one of the radially outer and inner surfaces is engageable with a clutch engagement surface on one of the clutch input member and the clutch output member; and a volume of lubricant positioned to lubricate the wrap spring clutch and the clutch engagement surface, wherein the clutch engagement surface has a surface finish that includes a plurality of peaks and valleys, wherein the peaks engage the wrap spring clutch and each have a selected width that is based at least in part on one or more properties selected from: a yield strength of a material making up the clutch engagement surface; and a working range of temperatures of the lubricant.