E. Maleki Pour , S. Golabi ,
Volume 4, Issue 2 (6-2014)
Abstract
Nowadays, automakers have invested in new technologies in order to improve the efficiency of their
products. Giant automakers have taken an important step toward achieving this objective by designing
continuously variable transmission systems (CVT) to continuously adapt the power of the engine with the
external load according to the optimum efficiency curve of engine and reducing fuel consumption beside,
making smooth start up and removing the shock caused by changing the gear ratio and making more
pleasurable driving. Considering the specifications of one of Iranian automaker products (the Saipa Pride
131), a CVT with a metal pushing belt and variable pulleys have been designed to replace its current
manual transmission system. The necessary parts and components for the CVT have been determined and
considering the necessary constraints, its mechanism and components have been designed.
H. Ghariblu, A. Behroozirad , A. Madandar ,
Volume 4, Issue 2 (6-2014)
Abstract
This paper concerns the design and analysis, of a ball type continuously variable transmission, (B-CVT).
This B-CVT has a simple kinematic structure, and same as a toroidal CVT, transmits power by friction on
the contact points between input and output discs, that are connected to each other by balls. After, a brief
introduction of our B-CVT structure, the performance and traction efficiency of B-CVT is analyzed. The
geometry and speed ratio of the proposed CVT is obtained. Then, by finding the contact areas between
rotating elements and stress distribution through them, the torque capacity of B-CVT is computed. Next,
the power loss of the system caused by various parameters such as relative arrangement of rotating
elements as well as relative velocity at contact areas is found. Finally, after presenting the influence of the
different geometrical and assembly conditions at efficiency of the system, the efficiency of the system
compared with the efficiency of a Toroidal CVT.
