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Research on Transmission Characteristics of Hydromechanical Continuously Variable Transmission of Tractor

Author

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  • Junyan Wang
  • Changgao Xia
  • Xin Fan
  • Junyu Cai

Abstract

This paper proposes a new transmission scheme of hydromechanical continuously variable transmission (HMCVT) for tractors. The HMCVT has 4 working ranges in each of the front and rear directions. The speed characteristic and the torque characteristic of HMCVT are theoretically derived. On the basis of HMCVT power flow direction, the Крейнeс formula is used to calculate the transmission efficiency. Then, the image analysis method is used to study the influence of parameters on the transmission efficiency of HMCVT, and the main influencing factors are found. The results of theoretical derivation demonstrate that, by coordinating control of the HST displacement ratio and the engagement conditions of shifting clutches, the stepless speed regulation of HMCVT at the tractor speed of 0–50 km/h can be realized. The proposed HMCVT has the ability to continuously transmit and change torque over all working ranges. The overall transmission efficiency of HMCVT is at a high level. To verify the theoretical derivation, Amesim simulation software is used for the modeling and simulation of HMCVT. The simulation results are consistent with the theoretical analysis results. Therefore, the HMCVT proposed in this paper has the advantages of compact structure and high transmission efficiency, and it is suitable for matching tractors.

Suggested Citation

  • Junyan Wang & Changgao Xia & Xin Fan & Junyu Cai, 2020. "Research on Transmission Characteristics of Hydromechanical Continuously Variable Transmission of Tractor," Mathematical Problems in Engineering, Hindawi, vol. 2020, pages 1-14, August.
    • Handle: RePEc:hin:jnlmpe:6978329
    DOI: 10.1155/2020/6978329
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    Cited by:

    1. Zhun Cheng & Zhixiong Lu, 2022. "Research on Dynamic Load Characteristics of Advanced Variable Speed Drive System for Agricultural Machinery during Engagement," Agriculture, MDPI, vol. 12(2), pages 1-13, January.
    2. Zhaorui Xu & Jiabo Wang & Yanqiang Yang & Guangming Wang & Shenghui Fu, 2023. "Optimization of Shifting Quality for Hydrostatic Power-Split Transmission with Single Standard Planetary Gear Set," Agriculture, MDPI, vol. 13(9), pages 1-18, August.
    3. Zhun Cheng & Zhixiong Lu, 2022. "Regression-Based Correction and I-PSO-Based Optimization of HMCVT’s Speed Regulating Characteristics for Agricultural Machinery," Agriculture, MDPI, vol. 12(5), pages 1-18, April.

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