| 摘要 |
946,338. Making gas lubricated bearings. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. May 4, 1962 [May 17, 1961], No. 18055/61. Headings B3A and B3D. [Also in Division F2] In a method of manufacturing a shaft and a sleeve of a gas lubricated journal bearing, the two members are machined circular, one of the members is radially stressed to deform its bearing surface and machined circular in this stressed condition so that when unstressed there results a lobed bearing surface. In Figs. 1 and 2 is shown a pair of clamps 5 and 6 for radially stressing a bearing sleeve 2 in such a manner as to form a two lobed internal bearing surface; suitably modified clamps will give any desired number of lobes. Alternatively, the the shaft may be internally stressed and externally machined to form a lobed shaft. The preferred machining operation is honing for both members, as roundness tolerances are of the order of 0.5 X 10<SP>-4</SP>, and working clearances are about 15 x 10<SP>-4</SP> for a 1 inch diameter shaft. The lobing is of a small order, for a 1 inch diameter shaft a two lobe surface, which will be approximately elliptical the major and minor axes may be 1.0007 and 1.0002 inches. The required pre-stressing for a given lobing is determined, and checked by using air gauges to check maximum and minimum diameters as the stressing clamps are tightened. Fluid pressure may be used instead of clamps. |
