| 摘要 |
PURPOSE:To improve the lubricating and sealing abilities and improve the combustion efficiency by providing an oil ring between compression rings inserted into a piston section. CONSTITUTION:Multiple pistons 2a-2d are provided in an annular cylinder 11 having a circular orbit. An oil ring 20d formed to introduce lubricating oil is inserted between compression rings 20a, 20b. The oil ring 20d section adequately lubricates the wall face of the cylinder 11 and the airtightness to a combustion chamber is maintained by a pair of rings. Accordingly, the lubricating ability and sealing ability of mainly rotors 2, 2' provided with the pistons 2a-2d, casings 1a, 1b, the pistons 2a-2d and cylinder 11 can be improved. |
