A closed hydraulic transmission system

Abstract

The invention discloses a closed type hydraulic transmission system which solves the problem that impact pressure on a motor shell caused by high-pressure oil during status switching and a certain amount of pressure existing in a loop when a hydraulic motor does not work produce resistance on vehicle running. The closed type hydraulic transmission system comprises a power input mechanism, a hydraulic pump assembly, a hydraulic control valve set, a first hydraulic motor, a second hydraulic motor, a non-pressurization oil tank and a control unit. The power input mechanism is in mechanical connection with the hydraulic pump assembly which is in pipeline connection with the hydraulic control valve set, the hydraulic control valve set is in pipeline connection with the first hydraulic motor and the second hydraulic motor respectively, the first hydraulic motor is in mechanical connection with a load mass body of the first hydraulic motor, the second hydraulic motor is in mechanical connection with a load mass body of the second hydraulic motor, both the hydraulic pump assembly and the hydraulic control valve set are in pipeline connection with the non-pressurization oil tank, and the control unit is connected with the hydraulic pump assembly and the hydraulic control valve set through signal wires.

Description

technical field [0001] The invention relates to a transmission system applied to a heavy truck or a heavy engineering transport vehicle, more precisely, the invention relates to a closed hydraulic transmission system. Background technique [0002] At present, the operating conditions of heavy-duty trucks or engineering vehicles are relatively complex and changeable. They often drive on muddy, sandy or ice-snow and other low-adhesion roads, or when climbing long slopes, the driving wheel slips and the driving force is insufficient. . The methods to solve this problem mainly include all-wheel drive structure, electric wheel assisted front wheel drive structure and hydraulic assisted front wheel drive structure. The all-wheel drive structure is widely used in the field of off-road passenger vehicles, but its own mechanical transmission structure is complicated and adds a lot of mass, which is not suitable for engineering transportation vehicles such as heavy trucks or tractors...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the large impact pressure caused by the high-pressure oil on the housing of the motor when the existing state is switched in the prior art and when the hydraulic motor is not working, there is a certain pressure in the hydraulic transmission circuit, which will affect the vehicle. To solve the problem of resistance caused by driving, a closed hydraulic transmission system is provided

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