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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 4    April 2016

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An investigation of cam-roller mechanism applied in sphere cam engine
ZHANG Lei(张雷), PAN Cun-yun(潘存云),XU Xiao-jun(徐小军), XU Hai-jun(徐海军), ZHANG Zheng-zhou(张正洲)

College of Mechatronic Engineering and Automation, National University of Defense Technology,
Changsha 410073, China

Abstract:As an alternative power source for hybrid electrical vehicle(HEV), electric generating system(EGS) driven by sphere cam engine(SCE) is said to own higher power density and integration. In this work,the structure and working principle of EGS were introduced, based on which the advantages of EGS were displayed. The profile of sphere cam was achieved after the desired motion of piston was given. After establishing the dynamic model of power transmission mechanism, the characteristics of cam-roller mechanism were studied. Theresults show that the optimal cam profile of SCE is a sinusoid curve which has two peaks and two valleys and a mean pressure angle of 47.19°. Because of the special cam shape, the trace of end surface center of piston is an eight-shape curve on a specific sphere surface. SCE running at speed of 3000r/min can generate the power of 33.81kW, which could satisfy the need of HEVs. However, the force between cylinder and piston skirt caused by Coriolis acceleration can reach up to 1182N, which leads to serious wear between cylinder liner and piston skirt and may shorten the lifespan of SCE.

 

Key words: sphere cam engine; hybrid electrical vehicle; cam-roller mechanism; kinetic analysis

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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