重载汽车主减速器盆形齿轮通常都采用大模数齿轮，经渗碳淬火处理。
The P/M gear wheel with special shape is an important structure part in transmission mechanism.
大模数重载汽车主减速器盆形齿轮经渗碳淬火后，齿轮齿面经常会出现裂纹。
Cracks frequently generated in basin gear of big modulus main reducer used in heavy load truck after carbonizing and quenching.
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