| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piston which dispenses with attachment of a piston ring, can secure a large bearing area of a leaf valve, and can be easily machined. <P>SOLUTION: In the piston having a resin disk 4 formed of a resin, and two metal disks 5, 6 layered to hold the resin disk 4 therebetween, the resin disk 4 has a first port 9 and a second port 10, and the metal disks 5, 6 have inner circumferential ports 13, 14, annular valve seats 15, 16 surrounding opening parts of the inner circumferential ports 13, 14, and outer circumferential ports 17, 18 opened from the outer circumferential side of the annular valve seats 15, 16. The inner circumferential port 13 of the metal disk 5 is made to communicate with the outer circumferential port 18 of the metal disk 6 via the first port 9, and the outer circumferential port 17 of the metal disk 5 is made to communicate with the inner circumferential port 14 of the metal disk 6 via the second port 10. <P>COPYRIGHT: (C)2013,JPO&INPIT |
