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Rotational swashplate pulse continuously variable transmission based on helical gear axial meshing transmission

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Abstract

The current research on pulse continuously variable transmission(CVT) is mainly focused on reducing the pulse degree and making pulse degrees a constant value. Current research mainly confined to find out new design parameters by using the method of optimization, and reduce the pulse degree of pulse CVT and its range of variation. But the fact is that the reduction of the pulse degree is not significant. This article presents a new structure of mechanical pulse CVT—the rotational swashplate pulse CVT with driven by helical gear axial meshing. This transmission is simple and compact in structure and low in pulsatile rate (it adopts 6 guide rods), and the pulsatile degree is irrelevant to the transmission ratio. Theoretically, pulsatile rate could be reduced to zero if appropriate curved surface of the swashplate is used. Compared with the connecting rod pulse CVT, the present structure uses helical gear mechanism as transmission part and it avoids unbalanced inertial force in the former model. This paper analyzes the principle of driving of this transmission, presents its mechanical structure, and discusses its motion characteristics. Experimental prototype of this type of CVT has been manufactured. Tests for the transmission efficiency(when the rotational speed of the output shaft is the maximum) and the angular velocity of the output shaft have been carried out, and data have been analyzed. The experimental results show that the speed of the output shaft for the experimental prototype is slightly lower than the theoretical value, and the transmission efficiency of the experimental prototype is about 70%. The pulse degree of the CVT discussed in this paper is less than the existing pulse CVT of other types, and it is irrelevant to the transmission ratio of the CVT. The research provides the new idea to the CVT study.

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Beijing Union University, Beijing, 100020, China

    Jiandong Sun, Wenyu Fu, Hong Lei, E. Tian & Ziping Liu

Authors
  1. Jiandong Sun
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  2. Wenyu Fu
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  3. Hong Lei
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  4. E. Tian
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  5. Ziping Liu
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Corresponding author

Correspondence to Jiandong Sun.

Additional information

This project is supported by Beijing Municipal Natural Science Foundation of China(Grant No. 3123036), and Science and Technology Project of Beijing Municipal Education Commission of China(Grant No. KM200911417010)

SUN Jiandong, born in 1954, is currently a professor at Beijing Union University, China. He received his master degree from Tsinghua University, China, in 1989. His research interests include continuously variable transmission, design of rehabilitation instrument.

FU Wenyu, born in 1972, is currently a lecturer at Beijing Union University, China. He received his PhD degree from Beijing Univeristy of Techonology, China, in 2010. His research interests include mechanics engineering, CAD/CAPP/CAM and biomechanics.

LEI Hong, born in 1964, is currently an associate professor at Beijing Union University, China. She received her bachelor degree from Chongqing University, China, in 1984. Her research interests include mechanics engineering, CAD/CAPP/CAM.

TIAN E, born in 1977, is currently a lecturer at Beijing Union University, China. She received her PhD degree from Wuhan University of Technology, China, in 2008. Her research interests include mechanics engineering, information management system in train.

LIU Ziping, born in 1969, is currently a lecturer at Beijing Union Univeristy, China. She received her master degree from Beijing University of Technology, China, in 2009. Her research interests include mechanics engineering, CAD/CAPP/CAM.

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Sun, J., Fu, W., Lei, H. et al. Rotational swashplate pulse continuously variable transmission based on helical gear axial meshing transmission. Chin. J. Mech. Eng. 25, 1138–1143 (2012). https://doi.org/10.3901/CJME.2012.06.1138

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  • DOI: https://doi.org/10.3901/CJME.2012.06.1138

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