An improved design of power-cycling hydrodynamic mechanical transmission
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DOI 10.1007/s12206-020-0708-0
Journal of Mechanical Science and Technology 34 (8) 2020 Original Article DOI 10.1007/s12206-020-0708-0 Keywords: · Efficiency · Hydrodynamic mechanical transmission · Power-split · Torque ratio · Torque converter
Correspondence to: Dongye Sun [email protected]
Citation: Liu, X., Sun, D. (2020). An improved design of power-cycling hydrodynamic mechanical transmission. Journal of Mechanical Science and Technology 34 (8) (2020) 3165~3179. http://doi.org/10.1007/s12206-020-0708-0
Received April 8th, 2020 Revised
May 6th, 2020
Accepted May 18th, 2020 † Recommended by Editor No-cheol Park
An improved design of power-cycling hydrodynamic mechanical transmission Xiaojun Liu and Dongye Sun State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China
Abstract Recent studies have demonstrated that the power-cycling hydrodynamic mechanical (PCHM) transmission has excellent performance in improving power performance and fuel economy of a wheel loader. However, these results have been obtained by assuming that its speed ratio can always change continuously. Hence, this study first investigated the speed ratio of the transmission how to change when shifting from one gear to another. It was found that the concept of the PCHM transmission suggested in the literature is ineffective, even for a configuration with two gears in the gearbox. Then, the configuration of the PCHM transmission was developed as a different one to increase the torque multiplication capacity and efficiency of the transmission. A design method for this transmission is proposed to quantify its performances. The design method is based on a multi-objective optimization problem which is comprised of two objectives, seven design variables and eleven constraints. The relationships between average efficiency of the transmission and maximum tractive force of the vehicle and the seven transmission parameters are qualitatively examined. Results show that the performance of the transmission depends mainly on the number of transmission gears instead of on three parameters of the torque converter. The average efficiency is not sensitive to the maximum tractive force on a globally optimal Pareto front. The PCHM transmission with the new configuration can enable the average efficiency and the maximum tractive force to increase by 2.1 % and by 6.6 %, compared to that of the traditional hydrodynamic mechanical transmission, respectively.
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Wheel loaders are generally equipped with a hydrodynamic mechanical (HM) transmission to adapt to complicated and unfriendly operating conditions [1]. The HM transmission significantly reduces dynamic loads harming the powertrain without interrupting the transmission of power from the engine to the wheels when shifting from one gear to another. It is also self-adaptive for external loads, which can reduce the working burden to operators [2]. Howeve
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