Soji Kamiya

Development of the aluminum alloy bearing with higher wear resistance

Abstract The recent demands for higher performance and lower fuel consumption of automotive engines require the bearings to operate under severe conditions. As a result of these requirements, engine bearings are used under higher unit loads and higher temperatures, where the oil film thickness between bearing and shaft is increasingly thinner. One of the problems with conventional aluminum alloy bearings used under these conditions is the low wear resistance. For this reason, we have developed a new aluminum alloy bearing that allows a higher wear resistance. This paper describes the mechanism to upgrade the wear resistance and the performance of this new bearing material.

Development of a new aluminum alloy bearing for small-sized diesel engines

Abstract In todays market, small-sized diesel engines used for passenger cars, RVs and commercial use vehicles are being pushed to new limits in fuel consumption, output and durability. As a result of these demands, engine bearings are used under increasingly severe loads and temperatures. A problem with the conventional aluminum alloy bearings which are used in these conditions is their low fatigue resistance. For this reason, a new aluminum alloy bearing, which reaches new levels in fatigue and corrosion resistance, was developed by improving the tensile strength of the aluminum alloy. This paper describes the performance of this new bearing material.

Development of anti-corrosive and wear resistant copper alloy for bushings

Abstract Recent diesel engines require higher performance and longer life. Due to high cylinder pressure, the operating unit load and temperature of piston pin bushings become high. Therefore, good load carrying capacity, wear resistance and corrosion resistance are required for piston pin bushings. For this reason, we have studied the effect of elements added to copper alloy for corrosion resistance and the effects of hard particles added into the copper matrix for wear resistance and the machinability of materials. Based on the experimental results, we have developed a new bushing material which improves the wear resistance and the corrosion resistance.