Engineering machinery walking speed controlling and switching valve
A traveling speed, engineering machinery technology, applied in mechanical equipment, transmission control, components with teeth, etc., can solve the problem that the performance and traction power characteristics of mechanical traveling mechanism cannot be completely improved, the traveling speed cannot be obtained, and the structure of the transmission system is complex. and other problems, to achieve the effect of high integration, smooth speed switching, and simplifying the transmission structure of the machine
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[0012] Embodiment of the present invention: construction machinery walking speed control switching valve, including a valve body 1, in the valve body 1 there are four cavities 2 arranged in sequence from left to right and connected in sequence, the first cavity on the left is Cavity 2 is connected with the right motor oil outlet B2 and oil return circuit T, the second left cavity 2 is connected with the left motor oil outlet B1, and the first cavity 2 on the right is connected with the left motor The oil inlet passage A1 and the oil inlet passage P are connected to the right motor oil inlet passage A2 on the second cavity 2 on the right side; the valve core 3 passing through the four cavities 2 is arranged in the valve body 1, and the valve core 3 is installed in the valve The core 3 is provided with three bosses 4, the first boss 4 on the left side of the spool 3 corresponds to the connection position between the first cavity 2 on the left and the second cavity 2 on the left, ...
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