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复杂工况下电子制动助力器密封圈间隙咬伤机制研究
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上海汽车工业科技发展基金项目(2005);上海市扬帆计划项目(19YF1434400)


Research on Clearance Damage Mechanism of Electric Brake Booster Seal Ring under Complicated Working Conditions
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    摘要:

    针对电子制动助力器主缸密封圈在高动态工况下发生间隙咬伤的问题,建立基于Mooney-Rilvlin的橡胶本构模型对密封圈应力进行仿真分析,通过构建间隙咬伤系数参数来定量表征密封圈在复杂因素下发生间隙咬伤的程度及损伤破坏速度。结果表明:在高压工况下,橡胶材料硬度在80以上时,密封圈具有较强抵抗变形的能力,根部不易被挤入间隙中,所以橡胶材料硬度是决定密封圈根部发生间隙咬伤的主要原因;而当接触面摩擦力过大时,活塞在运动过程中会将密封圈唇部挤入缝隙,因而接触面摩擦力是影响密封圈唇口间隙咬伤程度的主控因素。综合考虑材料硬度和接触面摩擦因数2个影响因素,通过正交试验确定了在实际摩擦因数为0.1~0.15的情况下,将橡胶硬度提高到80以上,可有效地降低密封圈唇口和根部发生间隙咬伤的概率。

    Abstract:

    Aimed at the clearance damage failure of the master cylinder sealing ring of the electronic brake booster under high dynamic conditions,a rubber constitutive model based on Mooney-Rilvlin was established to simulate and analyze the stress of the sealing ring.The parameter of clearance damage coefficient was constructed to quantitatively characterize the damage degree and destruction speed of the sealing ring under the action of complex factors.The results indicate that under high pressure,when the hardness of rubber material is above 80,the sealing ring has a strong ability to resist deformation,and the root is not easy to be squeezed into the gap,so the hardness of rubber material is the main reason for the clearance damage of the root of the sealing ring.When the friction of the contact surface is too large,the piston will squeeze the sealing lip into the gap in the process of movement,so the friction of the contact surface is the main control factor affecting the clearance damage degree of the sealing lip.Considering the two influencing factors of material hardness and friction coefficient of contact surface,it is determined by orthogonal test that when the actual friction coefficient is 0.1 to 0.15,increasing the rubber hardness to more than 80 can effectively reduce the probability of clearance damage at the lips and roots of the sealing ring.

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陈江涛,赵礼辉,徐侃峰,翁 硕,郑松林.复杂工况下电子制动助力器密封圈间隙咬伤机制研究[J].润滑与密封,2022,47(6):123-131.
CHEN Jiangtao, ZHAO Lihui, XU Kanfeng, WENG Shuo, ZHENG Songlin. Research on Clearance Damage Mechanism of Electric Brake Booster Seal Ring under Complicated Working Conditions[J]. Lubrication Engineering,2022,47(6):123-131.

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  • 在线发布日期: 2022-08-19
  • 出版日期: 2022-06-15