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Ⅳ.低速发动机曲轴轴承和稳定负荷轴承材料较大型的柴油机分为中速和低速两类。前者转速为350～1500转/分,曲轴直径在150～500毫米范围内;后者转速为80～120转/分,曲轴直径在450～1000毫米范围内。中速柴油机使用很多类同于高速汽车发动机的轴承材料,即白合金,20％锡-铝,或具有表面镀层的6％锡-铝或低锡铅青铜轴承材材等。铅-锡或铅-铟镀层的厚度英国通常为0.050毫米。由于轴承负荷并不那样高以致需用较高强度的铝-硅或高锡铅青铜。但是它们的负荷常常高于白合金能承受的负荷,因而在中速柴油机中使用白合金变得日益减少。有些轴承制造
Ⅳ. Low-speed engine crankshaft bearings and stable load bearing materials Larger diesel engine is divided into medium-speed and low-speed two categories. The former speed is 350 ~ 1500 rev / min, crankshaft diameter in the range of 150 ~ 500 mm; the latter speed is 80 ~ 120 rev / min, crankshaft diameter in the range of 450 ~ 1000 mm. Medium-speed diesel engines use many of the same bearing materials used in high-speed automotive engines, namely white metal, 20% tin-aluminum, or 6% tin-aluminum or low-tin lead bronze bearing materials with surface coatings. Lead-tin or lead-indium plating thickness in the United Kingdom is usually 0.050 mm. As the bearing load is not so high, the need for higher strength aluminum - silicon or high tin lead bronze. However, their load is often higher than the load that white metal can withstand, so the use of white metal in medium-speed diesel engines is diminishing. Some bearings are made