OIL-IMPREGNATED BUSHING, OILLESS CHAIN, AND PROCESS FOR PRODUCING OIL-IMPREGNATED BUSHING

摘要

An oil-impregnated bushing which suffers no oil film breakage on the inner peripheral surface thereof and has satisfactory life regarding wearing resistance; an oilless chain employing oil-impregnated bushings which each is that oil-impregnated bushing; and a process for producing the oil-impregnated bushing. The oilless chain (1) is obtained by alternately connecting a pair of inner plates (2, 2) connected to each other with oil-impregnated bushings (3, 3) and a pair of outer plates (4, 4) connected to each other with pins (5, 5) each of which has been inserted into the adjoining one of the oil-impregnated bushings (3, 3) of the adjoining pair of inner plates (2, 2). Each oil-impregnated bushing (3) is obtained by impregnating a bushing made of a sintered metal with a perfluoropolyether having a dynamic viscosity as measured at 40C of 350 mm/s or higher. The bushings are impregnated with a perfluoropolyether having a dynamic viscosity suitable for the temperature at which the oilless chain (1) is to be used.