Transmission efficiency of hydraulic clamp type traction transmission device

A hydraulic clamp type traction transmission device was fabricated to theoretically investigate the spin power loss and the sliding power loss during transmission. The mathematical model of the internal and external friction traction characteristics was established with the EHL theory. The internal and external friction EHL equation was jointly solved by the multi-grid method, and the transmission efficiency of the system and its variation were achieved. The results show that the hydraulic clamp type traction transmission device has a transmission character of high speed and high power. The transmission efficiency of continuously variable transmission in the whole ratio range can be above 95.5% by controlling the hydraulic clamp force. The spin power loss decreases first and then increases with an increase in the transmission ratio. The sliding power loss decreases with an increase in the transmission ratio, and it tends to be stable when the transmission ratio is greater than 0.5. These results indicate that the transmission efficiency decreases first and then increases with an increase in the transmission ratio.