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在内燃机往复运动中,内撑螺旋弹簧镀铬油环（以下简称内撑油环）的弹簧的受力状态是很复杂的。 第一、油环装缸后,弹簧便一直受到来自缸体的反作用压力（φ135:6～9 kg;φ95:3.5～6 kg）,要求弹簧应长期保持相应弹力。 第二、随着活塞周期性的往复运动,弹簧也受到往复推力的作用。 第三、在正常情况下,油环最高温度可达150℃,如内燃机过载或冷却条件不足,则温度会更高。
In the reciprocating motion of an internal combustion engine, the state of stress of the spring supporting the chrome-plated oil ring of the coil spring (hereinafter referred to as the oil-in-oil ring) is very complicated. First, the spring has been subjected to reaction pressure from the cylinder (φ135: 6 ~ 9 kg; φ95: 3.5 ~ 6 kg) after the oil cylinder is installed in the cylinder, and the spring should be required to maintain the corresponding elasticity for a long time. Second, as the piston periodically reciprocates, the spring is also subjected to reciprocating thrust. Thirdly, under normal circumstances, the maximum temperature of the oil ring can reach 150 ° C. If the internal combustion engine is overloaded or the cooling conditions are insufficient, the temperature will be higher.