Abstract: To make a sealing and guiding packet available to shock dampers in order to minimize or even entirely prevent the negative effects of the so-called stick-slip effect and thus permit greater riding comfort, a sealing and guiding packet is proposed which comprises the following features: a) A cylindrical gasket (6) surrounding an oscillating piston rod (10) and in contact with the latter, which has a first and a second end face (6a, 6b) and a cylindrical mantle surface (6c), b) a cylindrical elastomer element (7) surrounding the ring (6), which has two radially extending flanges (7a, 7b), which thrust the ring (6) resiliently against the end faces, and which [elastomer element] has a radially extending third flange (7c) which biases the ring against the piston rod surface; as well as c) tightening elements (1; 1.1, 1.2, 1.3; 4) which in the working state keep the elastomer element (7) under bias both in the axial and in the radial direction.

Abstract: An oil control ring for a piston of an internal combustion engine has an annular body defining a central axis. The ring has a U-shaped cross-section formed of a centrally positioned web extending parallel to the axis and a pair of axially spaced rail portions integrally connected to the web. Each rail portion extends radially outwardly with respect to the web, and an extremity of each rail portion defines a land extending parallel to the axis and adapted to sealingly engage a cylinder wall. Each land defines a pair of spaced chamfered sidewalls. Each sidewall extends contiguously from each land to define a chamfered edge adjacent the land. Finally, each chamfered edge defines a concave annular sidewall. The result is a reduction of land surface area in contact with the cylinder walls of an engine to provide improved performance, particularly during the engine break-in period.