| 摘要 |
1,125,524. Pistons. BRITISH OXYGEN CO. Ltd. 12 July, 1967 [4 Aug., 1966], No. 35045/66. Heading F2T. A cylinder, e.g. of a gas expansion engine, is provided with three or more equi-spaced grooves 14 fed with gas for centralizing the piston 7, the axial length of the grooves being such that they do not become uncovered by the piston where low pressure conditions exist. Compressed gas to be expanded passes through inlet ports 9 and passages 11, 12 in the piston to the expansion chamber 13 where it moves the piston to uncover exhaust ports 10 but not the grooves 14. Gas is fed to the grooves from either the ports 9 or an external source. The grooves may be inclined to the cylinder axis and formed by etching. |
