Hydrostatic transmission device detection platform load system

Abstract

The invention discloses a load system of a hydrostatic transmission device detecting platform. The load system is structurally characterized in that a circuit A and a circuit B are connected in parallel to form a loading pump feed circuit, each of the circuit A and the circuit B is formed by series connection of two one-way valves, an oil tank, a one-way hydraulic pump and the loading pump feed circuit are serially connected to form a closed circuit, and two ends of a loading pump are communicated with middle positions of the circuit A and the circuit B respectively. In order to protect the whole circuit, a pilot-operated relief valve is connected in parallel in front of the loading pump feed circuit; in order to regulate oil pressure of the whole circuit and working pressure of the loading pump, an electro-hydraulic pilot-operated proportional relief valve is serially connected behind the loading pump feed circuit. The load system has the advantages that the loading pump can rotate forwards and backwards directly without stopping the one-way hydraulic pump, and a solenoid valve is sensitive in response and less in consumption.

Description

technical field [0001] The invention relates to a load system, in particular to a load system used on a hydrostatic transmission testing platform. Background technique [0002] In the machinery industry standard of the People's Republic of China, the basic parameters, technical requirements, test methods, inspection rules, signs and packaging of hydrostatic transmissions are all required. Among them, the input speed, input torque, output speed, Output torque and no-load output speed. For this reason, the standard stipulates the experimental equipment. The input end of the hydrostatic transmission device to be tested is driven by a motor, and a tachometer and a torque meter are installed between the motor and the input end of the hydrostatic transmission device to measure the input speed and torque. Input torque; a loading device is connected to the output end of the hydrostatic transmission to be tested, and a tachometer and a torque meter are installed between the output e...

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Problems solved by technology

[0003] On the previous hydraulic testing platform, the load is usually provided by the hydraulic pump, but in the load system, the self-control valve usually extends the valve stem, and the rotation or movement of the valve core is controlled by an electric, pneumatic, or hydraulic actuator. , the sealing performance of the valve stem is reduced, and internal and external leakage has become a problem to be solved; and the structure is complex, the manufacturing cost is relatively high, the action is slow, and the energy consumption is large

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