多功能动力传动装置设计方案研究*

doi:10.19562/j.chinasae.qcgc.2020.10.012

Abstract

Abstract: A multifunctional power transmission device integrating hydrostatic, hydro-mechanical and mechanical transmissions is designed in this paper. Hydrostatic transmission is mainly used in starting condition to meet the requirement of smooth start; hydro-mechanical compound transmission is mainly used in operation conditions for meeting the requirement of stepless speed regulation; and the mechanical transmission is mainly used in transportation operation with high transmission efficiency; while meeting transmission requirement, the power take off shaft can output power to drive other mechanisms. The transmission performance optimization of multi-mode switching power transmission device is studied from three aspects of speed regulation characteristic, shifting strategy and efficiency characteristic. According to the design requirements, the kinematics and kinetic analyses on the vehicle system is performed to obtain the assembly schemes and related parameters of power transmission device, with its speed regulation characteristic analyzed, and in the whole process of speed regulation, the shifting strategy of power transmission device, in which clutches and brakes are jointly involved, is studied, with the optimal switching moment for each element found out. The efficiency of hydraulic system is obtained by empirical formulas, and the efficiency of multifunctional power transmission device is calculated using efficiency definition method. The efficiency curves of hydraulic system are fitted based on test data, and the efficiency of hydro-mechanical compound transmission system is further determined by conversion mechanism method. The results show that the shifting quality of power transmission device can be greatly enhanced by properly selecting the switching sequence of shifting elements. Hydraulic system has better efficiency characteristic under the conditions of large displacement, medium-high speed and medium pressure, and can achieve smooth start; mechanical transmission has higher efficiency, but it also requests better road conditions; while hydro-mechanical compound transmission generally has relatively good efficiency characteristic in the range of whole displacement ratio and medium-high speeds.

Key words: multifunctional power transmission device, transmission performances, speed regulation characteristic, shifting strategy, efficiency characteristic

Zhu Zhen, Cai Yingfeng, Chen Long, Xia Changgao, Tian Xiang, Shi Dehua. Research on the Design Scheme of Multifunctional Power Transmission Device[J].Automotive Engineering, 2020, 42(10): 1378-1385.

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Research on the Design Scheme of Multifunctional Power Transmission Device

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