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某单位一台日产D80A-12型推土机,在1989年4月由于使用本省××市生产的所谓14~＃中档压机油,仅运行7天便发生烧瓦断轴事故。经调查分析,原因纯属用油不当所致。通过化验,这种机油实有粘度仅11.8(100℃10~(-6)m~2/s),而标准的14~＃中档压机油的运动粘度应为12.5～16.3,两者相差1～4.5(100℃10~(-0)m~2/s)之多。因运动粘度低,造成发动机在高温摩擦表面上不易形成足够厚的油膜,曲轴主轴承、连杆轴承、凸轮轴轴承得不到正常的润滑,形成半干摩擦,使摩擦副之间发热,导致轴承合金脱落,发生烧瓦断轴。
A unit of a Nissan D80A-12 bulldozers, in April 1989 due to the use of the province’s production of the so-called mid-14 ~ # mid-pressure oil, running for only 7 days there will be burning shredded broken shaft accident. After investigation and analysis, the reason is purely caused by improper use of oil. Through the test, this oil has a viscosity of only 11.8 (100 ℃ 10 -6 m 2 / s), while the standard 14 ~ # mid-pressure oil should have a kinematic viscosity of 12.5-16.3, a difference of 1 ~ 4.5 (100 ℃ 10 ~ (-0) m ~ 2 / s). Due to low kinematic viscosity, resulting in the engine at high temperature friction surface is not easy to form a thick enough oil film, crankshaft main bearing, connecting rod bearing, camshaft bearings are not properly lubricated, the formation of semi-dry friction, the friction between the fever, resulting in Bearing alloy off, burning broken shaft occurred.