Dual-clutch transmission and hydraulic control system thereof

Abstract

The invention discloses a dual-clutch transmission and a hydraulic control system thereof. The hydraulic control system comprises a gear shifting oil circuit control device, a clutch oil circuit control device and an oil supply device, wherein the oil supply device is communicated with the gear shifting oil circuit control device and the clutch oil circuit control device so as to supply oil to the gear shifting oil circuit control device and the clutch oil circuit control device. The gear shifting oil circuit control device comprises at least one gear shifting control unit. Each gear shifting control unit comprises a gear shifting oil cylinder assembly communicated with the oil supply device. Each gear shifting oil cylinder assembly comprises a first oil cylinder, a first piston which is movably located in the first oil cylinder, a second oil cylinder, and a second piston which is movably located in the second oil cylinder; the first oil cylinder and the second oil cylinder are arranged in a spaced mode in the moving direction of the first piston and the second piston; a push rod stretching out of the first oil cylinder and the second oil cylinder is connected between the first piston and the second piston; the area of the end face, backing on to the push rod, of the first piston is not equal to the area of the end face, backing on to the push rod, of the second piston. By means of the technical scheme, the problems that an existing gear shifting oil cylinder assembly is poor in gear shifting performance and complex in structure are solved.

Description

technical field [0001] The invention relates to the technical field of automobile transmissions, in particular to a dual-clutch transmission and its hydraulic control system. Background technique [0002] Dual Clutch Transmission (DCT for short) is a new type of transmission, which arranges the transmission gears on the two input shafts connected to the two clutches according to odd and even numbers, and completes the transmission through the alternate switching of the two clutches. gear process to realize power shifting. Dual-clutch transmission combines the advantages of hydraulic-mechanical automatic transmission and electro-mechanical automatic transmission. It has high transmission efficiency and simple structure, which not only ensures the power and economy of the vehicle, but also greatly improves the comfort of the vehicle. [0003] The shifting process of the dual-clutch transmission is realized by sending control signals from the electronic control unit of the car...

AI Technical Summary

Problems solved by technology

[0011] Another problem to be solved by the present invention is that the existing oil supply device for the hydraulic control system of the dual-clutch transmission cannot simultaneously meet the requirements of the clutch oil circuit control device, shift oil circuit control device, clutch cooling lubricating oil circuit and gear shaft lubricating oil. The pressure, flow and cleanliness requirements of the supply hydraulic oil

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