| 摘要 |
1,138,285. Bearings. KARL SCHMIDT G.m.b.H. 16 Feb., 1966 [16 Feb., 1965], No. 6896/66. Heading F2A. [Also in Division B3] The sliding surface of an axial or radial bearing is provided with very slight uneveness, in order to more readily retain a lubricant film, by first hardening the surface in predetermined zones and then finish machining the surface, the different rates of chip removal in the normal and hardened zones producing the uneveness. Hardened zones 2 are formed in a radial bearing 1 by mechanical deformation, the inner bore being machined to produce the desired uneveness. The surface can subsequently be plated. The uneven sliding surface can be modified by heat treatment, the hardening step being preceded by homogenization annealing and the surface then being finish machined. Subsequent ageing at increased temperature produces a varying growth of strengthened and unstrengthened zones. The surface treatment is applicable to a composite, for example, steel/aluminium body. |
