| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To attain further power saving of a compressor by reducing friction loss of a piston while maintaining sealing performances. <P>SOLUTION: Fluororesin coat layer 35 is provided on an outer circumference surface of the piston 3. A surface of the coat layer 35 corresponds to a contact part 41 directly contacting and sliding on a sliding hole. A hollow part 42 not contacting the sliding hole is provided at an axial direction inner side of both sides of the contact part 41. The hollow parts 42 are provided on an outer circumference surface of the piston 3 dispersedly in a many dot shape. Since contact area of the piston 3 and the sliding hole can be reduced by the hollow parts 42 provided dispersedly in a many dot shape, and friction loss can be reduced. Since each hollow parts 42 retains lubricating oil and the lubricating oil is supplied to the sliding surface form each hollow part 42 during sliding, friction loss can be reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
