Patent ID: 9534598
Date: 2017-01-03
CPC Classifications: F01C,F04C,F16J

Claim:
1. A variable displacement pump, comprising: a support ring surrounding a center axis and having an inner surface; a cam ring disposed within said support ring and surrounding said center axis, said cam ring including an inner surface facing said center axis and an outer surface facing said inner surface of said support ring with said inner surface and said outer surface extending axially between opposite side surfaces, said outer surface of said cam ring defining at least one groove extending longitudinally between said opposite side edges and parallel to said center axis; and at least one sealing device being disposed in at least one groove of said cam ring, said cam ring including side surfaces and a base surface defining said at least one groove and said at least one sealing device including a sealing element and a friction element each having opposite ends and each extending parallel to said center axis, wherein said sealing element extends longitudinally within the at least one groove between said opposite side surfaces of said cam ring and is elastically deformable, wherein said friction element is disposed radially between said sealing element and said inner surface of said support ring and is in engaging contact with said inner surface of said support ring, and wherein said opposite ends of said friction element respectively extend from said base portion of said friction element radially inward toward said base surface of said cam ring, said radially disposed inward opposite ends defining inner contact surfaces and said sealing element being disposed therebetween such that said respective opposing ends of the sealing element engagingly contact said respective inner contact surfaces of said friction element so that said sealing element spans a width of said at least one groove in which portions of said sealing element engagingly contact said friction element and each of said side surfaces and said base surface that define said at least one groove of said cam ring, the respective portions of the sealing element having said engaged contact with said friction element and each of said side surfaces and said base surface along the entire length of said sealing element.