| 摘要 |
535,769. Making compound bearings. UNITED AIRCRAFT CORPORATION. July 15, 1939, Nos .20648 and 20649. Convention dates July 30, 1938 and Aug. 2, 1938. [Class 83 (ii)] [Also in Groups XXXIV and XXXVI] An anti-friction bearing comprises three or more mutually bonded strata of different materials arranged in order of increasing hardness away from the bearing surface. Fig. 6 shows a bearing block for use in the big end of a connecting rod. consisting of a backing- member 20 of a strong durable material such as steel coated interiorly with a softer material 28 such as silver which forms a base for a highly flowable malleable material 36 having good oilwetting properties such as lead. The surface of the silver layer 28 may be roughened by sand blasting and the lead applied by electro plating. The lead surface is then smoothed down to the proper thickness by a rolling operation. The lead surface may be fortified by electro plating with indium, thallium or gallium. This electroplating may be effected in the case of cylindrical plain bearings by means of a fixture protecting the ends of the bearing and carrying the anode. The interior of the bearing is filled with the plating solution and the current passed between the anode and the backing shell or bearing-retaining member. The bearing may be heated in an oil bath for about two hours to a temperaure about 340‹F. between the melting points of indium and lead to cause the indium to impregnate the lead and produce a corrosion and erosion-resisting alloy. |
