Patent ID: 11933407
Assignee: RIKEN
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A combination comprising a compression ring, a piston, and a cylinder, wherein
the compression ring is an annular compression ring having a pair of gap faces opposed to each other to form a free gap and a nominal diameter d1 equal to an inner diameter of the cylinder to which the compression ring is attached to along with the piston,
a self tangential force of the compression ring is 5 N to 50 N, and
a radius of curvature R1 and the nominal diameter d1 of the compression ring satisfy a relationship:

−0.01≤(2R1−d1)/d1<0.002

where the radius of curvature R1 is that of an outer peripheral arcs of gap end portions in a free shape state before the compression ring is attached to the cylinder, and
the gap end portions are defined in ranges between the gap faces and positions where a center angle from a midpoint of the free gap is 35°.