Patent ID: 9217507
Filing Date: 2015-12-22
Classification: F16J

Abstract:
1. A multi-part piston ring, comprising an at least single-part circular spring support which is provided with a piston ring joint region and an at least single-part non-circular spring element which is positioned in a grooved provided in a region of the inner circumferential face of the spring support, wherein a wall thickness of the spring support is about equal in a region of piston ring joint ends of the spring support facing the piston ring joint and in a rear region of the spring support, and wherein at least one pocket which extends over a circumferential range of at least 60° is provided by local reduction of the wall thickness of the spring support provided in each case between the rear region and the piston ring joint ends of the spring support and wherein, a reduction in the wall thickness cross section of the spring support, starting from the piston ring joint, in a circumferential range from α>20° to α′ of max. 120° is provided in such a manner that the radial pressure distribution assumes at a minimum value in the region of the piston ring joint ends and at a maximum value in the range of reduced wall thickness, wherein a radial depth of the circumferential groove is modified in the circumferential direction of the spring support, by changing the radial wall thickness of the piston ring measured between a running surface and a bottom of the spring support in such a manner that the circumferential groove is non-circular and has a predefined ovality in a plane perpendicular to the axial direction of the piston ring.