Friction Loss of Steel Rings in Metal V-belt CVT

doi:10.3901/JME.2018.14.169

Abstract

Abstract: In view of the problem of low transmission efficiency of existing continuously variable transmission(CVT), taking a domestic CVT as the research object, the friction loss calculation model of steel ring is established based on the force model and the kinematic model of steel rings, and the distribution characteristics and mechanism of the steel ring friction loss are analyzed. The analysis results show that the friction loss of steel ring increases with the increase of input torque and rotational speed, and the sensitivity of friction loss to input rotational speed is higher in range of MED to OD than that of MED to LOW, the friction loss of steel ring is approximately V-shaped in the whole range of speed ratio, the friction loss of each layer steel ring is reduced from inner to outer, the friction loss in innermost steel ring is the main component of total steel ring friction loss, and the pitch circle distance is the root cause of the loss in innermost steel ring. The reliability of the calculation model is verified by the test. Finally, according to the analysis results, an improved structure of metal belt is proposed, which can greatly reduce the friction loss of steel ring by setting the pitch circle distance to zero. This provides a new design idea for improving CVT transmission efficiency from optimization of metal belt structure.

Key words: continuously variable transmission, friction loss, improved metal v-belt, pitch circle distance, steel ring, transmission efficiency

CLC Number:

U463

FU Bing, ZHOU Yunshan, HU Xiaolan, LI Hangyang, LIU Yunfeng, ZHANG Feitie. Friction Loss of Steel Rings in Metal V-belt CVT[J]. Journal of Mechanical Engineering, 2018, 54(14): 169-178.

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