日本五十铃汽车公司1975年生产的 V—10柴油机,螺栓采用了新的拧紧方法,即:把螺栓拧到塑性变形区域再旋转固定角度的方法(下称“塑性区域旋转角度法”)。所谓“塑性区域”,在材料力学上认为是失去弹性后的状态。新发动机排量12.5升,最高转速2800转/分,允许超限20%,瞬时超限50%(4200转/分时,活塞平均速度16.8米/秒)。该发动机中的连杆螺栓、飞轮和皮带轮螺栓、曲轴平衡块 The 1975 Nissan V-10 diesel engine produced by Japan’s Isuzu Motor Co., Ltd. uses a new method of tightening the bolt by twisting the bolt into the plastic deformation area and then rotating it by a fixed angle (hereinafter referred to as “plastic area rotation angle method”). The so-called “plastic zone”, in the mechanics of materials is considered to be the state after losing elasticity. The new engine displacement of 12.5 liters, the maximum speed of 2800 rev / min, allowing overrun 20%, instantaneous overrun 50% (4200 rev / min, the average piston speed of 16.8 m / s). Connecting rod bolts, flywheel and pulley bolts in the engine, crankshaft counterweight