湿式多片摩擦离合器摩擦副热分析
发布时间：2018-09-06 17:11
【摘要】：湿式多片摩擦离合器广泛应用于车辆、船舶及工程机械中的一个重要的传动部件,它依靠摩擦片与对偶钢片之间的摩擦力来传递动力。在湿式多片摩擦离合器的接合过程中,在控制油压的作用下,活塞压紧摩擦副,由于离合器的主动部分和从动部分存在转速差,因此摩擦片和对偶钢片相互滑摩,产生大量摩擦热。摩擦热流进入摩擦片和对偶钢片后,引起温度场的改变,进而引起热应力场的产生,改变了盘片的力学状态。由摩擦热引起的离合器内部的温度场和热应力场的改变是离合器失效的重要因素,它将导致摩擦片和对偶钢片的翘曲、局部烧损、盘片表面材料剥离以及表面热裂纹生成等形式的失效。因此,对离合器摩擦副进行热分析,对于解决由摩擦热引起的离合器失效具有较高的理论意义和实用价值。 根据湿式多片摩擦离合器的基本结构,对摩擦副几何模型进行了合理的简化,推导了摩擦生热以及摩擦热分配的数学模型。在此基础上建立了模拟湿式多片摩擦离合器摩擦片和对偶钢片温度场及热应力场的有限元模型,在较为准确地确定边界条件后,进行了热分析的求解。讨论了离合器接合过程中摩擦片和对偶钢片温度场的空间分布规律、温度场随时间变化的规律,并通过顺序耦合法求得摩擦片和对偶钢片的热应力场,得到了热应力场的空间和时间分布规律。 对离合器摩擦副中的热弹不稳定特性进行了理论分析,研究了扰动作用下对称型和反对称型对偶钢片的温度场、位移场和应力场模型,得出了特征方程,求得热弹不稳定特性的临界速度。着重研究波数、盘片厚度和结构对称性等因素对摩擦副中热弹不稳定现象影响规律。 本文的研究成果为改善湿式多片摩擦离合器的性能,延长其使用寿命提供了指导,为高性能湿式多片摩擦离合器的设计开发奠定了理论基础。
[Abstract]:Wet multi-disc friction clutch is widely used in vehicles, ships and construction machinery as an important transmission component, which relies on the friction between the friction plate and the dual steel plate to transfer power. In the joint process of wet multi-disc friction clutch, under the action of controlling the oil pressure, the piston compacts the friction pair. Because of the difference of rotational speed between the active part and the follower part of the clutch, the friction plate and the dual steel sheet slip each other. Generate a lot of friction heat. When the friction heat flow enters the friction sheet and the dual steel sheet, the temperature field is changed, and the thermal stress field is produced, which changes the mechanical state of the disc. The change of temperature field and thermal stress field in clutch caused by friction heat is an important factor of clutch failure, which will lead to the warpage and local burning of friction plate and dual steel sheet. The failure of the surface material and the formation of hot cracks on the surface of the disc. Therefore, thermal analysis of clutch friction pair is of high theoretical significance and practical value in solving clutch failure caused by friction heat. According to the basic structure of wet multi-disc friction clutch, the geometric model of friction pair is reasonably simplified, and the mathematical models of friction heat generation and friction heat distribution are derived. On this basis, a finite element model for simulating the temperature field and thermal stress field of a wet multi-disc friction clutch is established. After the boundary conditions are determined accurately, the thermal analysis is carried out. The spatial distribution of temperature field of friction plate and dual steel sheet during clutch engagement and the variation of temperature field with time are discussed. The thermal stress field of friction plate and dual steel sheet is obtained by sequential coupling method. The spatial and temporal distribution of thermal stress field is obtained. In this paper, the thermoelastic instability characteristics of clutch friction pair are theoretically analyzed. The temperature field, displacement field and stress field model of symmetric and antisymmetric steel plates under disturbance are studied, and the characteristic equations are obtained. The critical velocity of thermoelastic instability is obtained. The effects of wavenumber, disc thickness and structural symmetry on thermoelastic instability in friction pairs are studied. The research results of this paper provide guidance for improving the performance and prolonging the service life of wet multi-disc friction clutch and lay a theoretical foundation for the design and development of high performance wet multi-disc friction clutch.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.4
本文编号：2227005
[Abstract]:Wet multi-disc friction clutch is widely used in vehicles, ships and construction machinery as an important transmission component, which relies on the friction between the friction plate and the dual steel plate to transfer power. In the joint process of wet multi-disc friction clutch, under the action of controlling the oil pressure, the piston compacts the friction pair. Because of the difference of rotational speed between the active part and the follower part of the clutch, the friction plate and the dual steel sheet slip each other. Generate a lot of friction heat. When the friction heat flow enters the friction sheet and the dual steel sheet, the temperature field is changed, and the thermal stress field is produced, which changes the mechanical state of the disc. The change of temperature field and thermal stress field in clutch caused by friction heat is an important factor of clutch failure, which will lead to the warpage and local burning of friction plate and dual steel sheet. The failure of the surface material and the formation of hot cracks on the surface of the disc. Therefore, thermal analysis of clutch friction pair is of high theoretical significance and practical value in solving clutch failure caused by friction heat. According to the basic structure of wet multi-disc friction clutch, the geometric model of friction pair is reasonably simplified, and the mathematical models of friction heat generation and friction heat distribution are derived. On this basis, a finite element model for simulating the temperature field and thermal stress field of a wet multi-disc friction clutch is established. After the boundary conditions are determined accurately, the thermal analysis is carried out. The spatial distribution of temperature field of friction plate and dual steel sheet during clutch engagement and the variation of temperature field with time are discussed. The thermal stress field of friction plate and dual steel sheet is obtained by sequential coupling method. The spatial and temporal distribution of thermal stress field is obtained. In this paper, the thermoelastic instability characteristics of clutch friction pair are theoretically analyzed. The temperature field, displacement field and stress field model of symmetric and antisymmetric steel plates under disturbance are studied, and the characteristic equations are obtained. The critical velocity of thermoelastic instability is obtained. The effects of wavenumber, disc thickness and structural symmetry on thermoelastic instability in friction pairs are studied. The research results of this paper provide guidance for improving the performance and prolonging the service life of wet multi-disc friction clutch and lay a theoretical foundation for the design and development of high performance wet multi-disc friction clutch.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH133.4
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