Oil charge and discharge control valve for coupler

Abstract

The invention relates to an oil charge and discharge control valve for a coupler. The oil charge and discharge control valve comprises a valve body, an oil inlet, an oil return port, an oil charge port, an oil discharge port and an air inlet of high-pressure air are formed in the valve body, the oil inlet and the oil return port are connected with an oil tank, the oil charge port is connected with the coupler, the oil discharge port is connected with an oil discharge groove of the coupler, a piston, a control slide valve and a resetting spring are arranged in the valve body, an air chamber is formed in the top of the piston, the air inlet is communicated with the air chamber, the piston is connected with the top of the control slide valve, the resetting spring is connected to the control slide valve, the piston and the control slide valve are in sliding connection with the inner wall of the valve body, and the oil inlet, the oil return port, the oil charge port and the oil discharge port are selectively communicated or disconnected through the movement of the control slide valve. The overall structure of the oil charge and discharge control valve is simple, work oil flows continuously in a circulating mode in the work process, system oil pressure can be balanced, a liquid coupler is made to work stably and reliably, it is guaranteed that a cooling fan only rotates at two rotating speeds of rated speed and running-down speed, and the control mode of the cooling fan is simpler.

Description

technical field [0001] The invention relates to a coupling used for driving a cooling fan of an internal combustion engine, in particular to a coupling oil filling and discharging control valve for controlling the oil filling and discharging work of the coupling. Background technique [0002] At present, high-power internal combustion engines are generally equipped with cooling fans, that is, when the internal combustion engine is started, the cooling fan is started immediately. In the prior art, the cooling fan generally has the following two drive methods, one is motor drive, and the motor directly drives the cooling fan. However, the failure rate of the motor is high, and the cost is high, which is greatly affected by the vehicle operating environment and climate; the other is driven by the hydrostatic system, which uses the hydrostatic pump and the hydrostatic system to control the hydrostatic motor, and then the hydrostatic motor Drive the cooling fan, but the drive sys...

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Problems solved by technology

[0002] At present, high-power internal combustion engines are generally equipped with cooling fans, that is, when the internal combustion engine is started, the cooling fan is started immediately. In the prior art, the cooling fan generally has the following two driving methods, one is motor drive, and the motor directly drives the cooling fan. However, the failure rate of the motor is high, and the cost is high, which is greatly affected by the vehicle operating environment and climate; the other is driven by the hydrostatic system, which uses the hydrostatic pump and the hydrostatic system to control the hydrostatic motor, and then the hydrostatic motor Drive the cooling fan, but the drive system has complicated pipelines, many auxiliary equipment, and high failure rate

At present, there are also hydraulic couplings used to transmit torque to drive the cooling fan, and the work of the hydraulic coupling is controlled by controlling the oil filling, oil discharge and liquid filling rate of the coupling, thereby realizing the opening, stopping and adjustment of the cooling fan. High-speed automatic operation, but in the prior art, the control method of the cooling fan is relatively complicated, and the structure of the oil filling and discharging control valve used to control the oil filling and discharging of the coupling is also relatively complicated.

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