Loader variable speed hydraulic system
A hydraulic system and loader technology, applied in the field of hydraulic systems, can solve problems such as overflow loss and shift shock, and achieve the effects of eliminating overflow loss, improving shift shock, and increasing service life
Active Publication Date: 2017-11-24
GUANGXI LIUGONG MASCH CO LTD
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[0019] The specific implementation will be described below in conjunction with the accompanying drawings.
[0020] Such as figure 1 As shown, the unloading valve 4 in the present invention has a T oil port, a PW oil port, and an EF oil port. The unloading valve 4 includes a check valve 41, a pilot valve 42, and a main valve 43. The check valve 41 is connected to the PW port. Between the oil port and the EF oil port and to the PW oil port, the liquid control end of the pilot valve 42 is connected to the oil outlet end of the one-way valve 41, and the oil outlet end and the spring chamber of the pilot valve 42 are connected to the T oil port. connection, the spool spring cavity of the main valve 43 is connected in parallel with the oil inlet port of the pilot valve 42 and then connected to the EF oil port through the throttle valve, the main spool cavity of the main valve 43 is connected to the EF oil port, and the outlet of the main valve 43 The oil end is connected to the T p...
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The invention relates to a loader variable speed hydraulic system, aims to solve the overflow loss, shifting impact and shifting delay problems of the loader variable speed hydraulic system, and provides the loader variable speed hydraulic system. The loader variable speed hydraulic system is characterized in that an oil inlet of a variable speed pump is connected with a gearbox oil body shell; an oil outlet is connected with an EF oil port of an unloading valve; a PW oil port of the unloading valve is connected with an oil inlet of a variable speed operating valve; an energy accumulator is connected onto a connecting oil line between the PW oil port of the unloading valve and the oil inlet of the variable speed operating valve; and a T oil port of the unloading valve is connected with the gearbox oil body shell through a torque converter and a counterbalance valve. In the technical scheme, the working pressure of the variable speed pump is approximately 0.2 to 0.5 MPa and is lower than the overflow pressure value of a traditional variable speed hydraulic system, and the energy saving effect is quite obvious; the energy accumulator can quickly supply pressure oil to the variable speed operating valve, so that the shifting delay problem is effectively solved; and the energy accumulator can absorb pressure fluctuation inside the pipeline during shifting, so that the shifting impact problem is effectively improved.
Description
technical field [0001] The invention relates to a hydraulic system, more specifically, to an unloading valve and a loader variable speed hydraulic system. Background technique [0002] At present, the intelligent power shift gearboxes used in loaders are all equipped with a variable speed hydraulic system, which is used to control the shifting of the gearbox through pressure oil and provide tank oil to the torque converter. The working principle of the traditional transmission hydraulic system is: the tank oil output by the transmission pump enters the transmission control valve after passing through the oil filter, and controls the tank oil to enter different gear clutches by controlling the opening and closing of different electromagnetic valves in the transmission control valve. In this way, the shifting action is realized, and the tank oil output by the variable speed pump is supplied to the torque converter at the same time. The variable speed hydraulic system is equip...
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IPC IPC(8): F15B1/02F15B13/02F16H61/30
CPCF15B1/024F15B13/02F15B2211/50536F16H61/30F16H2061/305
Inventor 莫雄超陈礼光陈继炯梁振国
Owner GUANGXI LIUGONG MASCH CO LTD