| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a piston bearing structure for a hydraulic cylinder capable of restraining deformation that a part of a wear ring protrudes from a piston housing groove. <P>SOLUTION: In this piston bearing structure for a hydraulic cylinder, the wear ring 20 makes slide contact with a cylinder tube 2 to support the piston 3. A part of the wear ring 20 is fitted in the housing groove 12 for the piston 3. The wear ring 20 includes: joint ends 21m forming a joint 21; a ring outer peripheral surface 20o in slide contact with the cylinder tube 2; and a pressure relief groove 22 opened at least in the ring outer peripheral surface 20o to connect both sides of the wear ring 20 with each other between the piston 3 and the cylinder tube 2. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
