Patent ID: 8371585

Claim:
An oil wiper ring, comprising: a wiper ring body ( 2 ) having, a radially inner surface ( 6 ), laterally opposed upper ( 7 ) and lower ( 8 ) flanks and at least two slide ribs ( 4 , 5 ) which conically taper from the wiper ring body ( 2 ) to their free ends ( 10 ) and have laterally opposed and angled side faces ( 11 , 13 ) which slope toward one another at predetermined associated angles (e, f), wherein respective transition regions (b, c, d) are rounded with defined radii from a bevelled region ( 12 ) of the contact surface of the slide ribs ( 4 , 5 ) into the angled side faces ( 11 , 13 ) and from the angled side faces ( 11 , 13 ) into the wiper ring body ( 2 ); and wherein the free end ( 10 ) each of said slide ribs ( 4 , 5 ), starting with a region on an oil chamber (O) side of the wiper ring body ( 2 ) is bevelled ( 12 ) towards a combustion chamber (B) and the angled side face ( 11 ) facing the oil chamber (O) runs from the wiper ring body ( 2 ) in the direction of the free end ( 10 ) of the slide ribs ( 4 , 5 ) at an angle (e) of between 0.5 and 15° relative to a radial direction and the angled side face ( 13 ) facing the combustion chamber (B) runs from the wiper ring body ( 2 ) in the direction of the free end ( 10 ) of the slide ribs ( 4 , 5 ) at an angle (f) of between 0.55 and 15° relative to the radial direction and the transitional zone between the angled side face ( 11 ) facing the oil chamber (O) and the bevelled region ( 12 ) has a radius (b) of between 0.05 and 0.2 mm and the transitional zone from the beveled region ( 12 ) into the angle side face ( 13 ) facing the combustion chamber (B) has a radius (c) of between 0.05 and 0.2 mm and the transitional zone form the angle side face ( 13 ) facing the combustion chamber (B) into the wiper ring body ( 2 ) has a radius (d) of between 0.05 and 0.20 mm and the beveled region ( 12 ) is inclined at a slope angle (g) of 5 to 50° and the slope angle is greater than either of the side face angles (e,f).