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在台架条件下，通过静态应变仪的测试及对离合器壳断口的微观分析结果表明：ＳＹ６４７４轻型客车动力总成各分总成间的装配偏差使离合器壳拨叉孔处应力升高，达该车离合器壳材料持久疲劳强度极限的１８％；动力总成弹性悬置装配偏差使离合器壳下边筋的柱锥过渡处应力升高，达该车离合器壳材料持久疲劳强度极限的２３％。该离合器壳开裂为疲劳破坏，开裂源在离合器壳下部的缩孔处。由于断口中存在着气孔、夹杂物和疏松现象，这些缺陷使材料抗冲击性能变差，抗疲劳强度降低，最终造成壳体早期开裂
The test results of the static strain gauge and the fracture of the clutch shell under the condition of bench show that the assembly deviation of each sub-assembly of the SY6474 light bus powertrain increases the stress at the fork hole of the clutch shell, The ultimate fatigue strength of the clutch shell material is 18% of the ultimate fatigue strength. The assembly deviation of the powertrain elastically increases the stress at the transition of the cone of the lower rib of the clutch shell, reaching 23% of the ultimate fatigue strength limit of the clutch shell material. The clutch housing is cracked and fatigue cracked, and the cracking source is at the shrinkage hole in the lower part of the clutch housing. Due to the existence of pores in the fracture, inclusions and loose phenomenon, these defects make the material deterioration of the impact resistance, fatigue strength decreased, and ultimately lead to early shell cracking