Experimental research on the effect of structural parameters on the governing characteristics of a pulley-drive,continuously variable transmission

Abstract

Because of its incomparable advantages over other transmissions especially in some specific conditions, rubber-V-belt, continuously variable transmissions (CVTs) have been extensively applied in low-power vehicles, such as scooters and snowmobiles. The main structural parameters of a CVT evidently affect the driving performance of the vehicle. The effect of one main structural parameter, namely the masses of the flyweights utilized, on the governing characteristics of the CVT is studied, and the mechanism of the effect is explained. First, a mechanical analysis of the drive pulley and the driven pulley of a rubber-belt CVT employed on a snowmobile is conducted. Through the theoretical analysis, the mathematical model of the system running in a steady state is built. Then the principle of parameter optimization, the running resistance of the vehicle, as well as the external characteristics of the gasoline engine applied in the snowmobile are investigated. Finally, experimental research on the structural tuning based on the building of a CVT test rig is carried out. Since it is difficult to change the parameters of some components such as the torque cam and the profile line of the flyweights, the masses of the flyweights are considered as the unique design variables, and different regulating characteristics of the available groups are obtained. Different applications accordingly require corresponding structural design schemes. The experimental results show that the proposed parameter-tuning principle is theoretically correct and practically feasible, which makes it useful for guidance in designing the CVT, as well as the whole driveline.

Keywords

pulley-drive continuously variable transmission mathematical model governing characteristics parameter tuning experiments

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References

DeVilbiss

B. L.

Mathematical modeling of a rubber V-belt continuously variable transmission MS Thesis, University of Cincinnati, Cincinnati, Ohio, USA, 1997.

Gerbert

B. G.

‘Belt slip — a unified approach.’

Trans. ASME, J. Mech. Des. 118 (3) (1996): 432–438

Gerbert

Sorge

‘Full sliding adhesive-like contact of V-belts.’

Trans. ASME, J. Mech. Des. 124 (4) (2002): 706–712

Sheu

K. B.

Chiou

S. T.

Hwang

W. M.

Wang

T. S.

Yan

H. S.

‘New automatic hybrid-transmissions for motorcycles.’

Proc. Natn. Sci. Coun., Repub. China, Part A: Phys. Sci. Engng 23 (6) (1999): 716–727

Sheu

K. B.

Yan

H. S.

‘Dual mode transmission designs for motorcycles.’

JSME Int. J., Ser. C, Mech. Systems Mach. Elements Mfg 45 (2) (2002): 637–646

Sheu

K. B.

Hsu

T. H.

‘Design and implementation of a novel hybrid-electric-motorcycle transmission.’

Appl. Energy 83 (9) (2006): 959–974

Sheu

K. B.

Hsu

T. H.

Hsu

Y. Y.

‘A novel parallel hybrid motorcycle transmission.’ In Progress on Advanced Manufacture for Micro/Nano Technology 2005, in Mater. Sci. Forum, 2006, 505–507, 1021–1026.

Chen

T. F.

An improved design of a high efficiency rubber V-belt continuously variable transmission PhD Dissertation, Department of Power Mechanical Engineering, National Tsing Hua University, Taipei, Republic of China, 1998.

Chen

T. F.

Lee

D. W.

Sung

C. K.

‘An experimental study on transmission efficiency of a rubber V-belt CVT.’

Mechanism Mach. Theory 33 (4) (1998): 351–363

10.

LeMaster

‘A hybrid transmission for SAE Mini Baja vehicles.’ SAE paper 2003–32-0045, 2003.

11.

Carbone

Mangialardi

Bonsen

Tursi

Veenhuizen

P. A.

‘CVT dynamics: Theory and experiments.’

Mechanism Mach. Theory 42 (4) (2007): 409–428

12.

Kong

L. Y.

Parker

R. G.

‘Mechanics and sliding friction in belt drives with pulley grooves.’

Trans. ASME, J. Mech. Des. 129 (2006): 494–502

13.

Sorge

‘Transient mechanics of V-belt variators.’ In Proceedings of the 2004 International Continuously Variable and Hybrid Transmission Congress, San Francisco, California, USA, 23–25 September 2004, paper 04CVT-45 (University of California, Davis, California).

14.

Worley

W. S.

‘Designing adjustable-speed V-belt drives for farm implements.’ SAE paper 550256, 1955.

15.

Oliver

L. R.

Henderson

D. D.

‘Torque sensing variable speed V-belt drive.’ SAE paper 720708, 1972.

16.

Kim

‘Axial forces of a V-belt CVT. Part 1: Theoretical analysis.’

KSME J. 3 (1) (1989): 56–61

17.

Willis

C. R.

‘A kinematic analysis and design of a continuously variable transmission.’ Master's Thesis, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA, 2006.