Patent ID: 8827277
Filing Date: 2014-09-09
Classification: F02F,F16J

Abstract:
1. An oil-reserving piston ring, comprising an upper wedge ring ( 100 a , 200 a ) and a lower wedge ring ( 100 b , 200 b ) engaged with each other, the upper wedge ring ( 100 a , 200 a ) and the lower wedge ring ( 100 b , 200 b ) being each provided with an opening; the upper wedge ring ( 100 a , 200 a ) having a first working surface ( 101 , 201 ) contacting with the wall of a cylinder and the lower wedge ring ( 100 b , 200 b ) having a second working surface ( 102 , 202 ) contacting with the wall of the cylinder; characterized in that: at least one of the first working surface ( 101 , 201 ) and the second working surface ( 102 , 202 ) is arranged with at least one oil-reserving groove ( 105 , 106 , 205 , 206 ); wherein the openings of the upper wedge ring (