Abstract
The mechanical power generated by the engine is transferred to the wheels by different transmission parts. During this transfert, a part of the power is lost in friction and other dissipative phenomenons. This loss of power affects the vehicle's performance as well as its fuel consumption. Hence the transmission efficiency has a significant impact on the vehicles specifications in the car industry.
A vehicles transmission usually contains some of the following components: clutch, hydraulic torque converter, gearbox (manual, automatic or continuously variable), couplings and transmission shafts. Our work is more specifically related to gearboxes using the following technologies: manual, automatic or continuously variable (using a Van Doorne belt).
Our goal is to improve the transmissions efficiency and to integrate the power loss calculations procedure for the developement of vehicle transmission.
This work aims to make the dissipative phenomenons understandable, to establish a hierarchy between them and to propose solutions which will decrease the power losses in transmissions.