Method for Increasing the Resistance to the Fretting Corrosion of the Friction Surfaces of Two Ferrous Metallic Members.

摘要

1,180,971. Bearings; lubricating. ING. C. OLIVETTI & C. S.p.A. 7 July, 1967 [8 July, 1966], No. 31337/67. Heading F2A. In a method for increasing the resistance to fretting of two relatively movable ferrous members, a first member moves at a higher speed than a second member, is provided with grooves which remove wear-particles from the areas of contact, and is coated with a layer of hard metal; and the second member is provided with a layer of ductile metal. In an embodiment, a shaft 6, Fig. 1, is mounted in a bore 7 of a plate 8 and, prior to being coated with hard metal, is provided with a series of grooves 13, Fig. 2. In modifications rectangular-shaped grooves 14, Fig. 3 (not shown), or herringboneshaped grooves 15, Fig. 4 (not shown), may be provided in the shaft 6. In another embodiment, grooves 16, Fig. 5 (not shown), are provided in the bore 7 of the plate 8. The layers of metal may have anti-corrosion and anti-oxidant properties and pure, neutral petroleum jelly may be used as a lubricant.