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The gear pump used in the hydraulic system is of outer meshed gear pump. See
figure 4-6-4 for its working principle. A pair of meshed involute gear is installed
inside of the housing. The two ends of the gear are sealed. The pump housing is
divided into two sealed oil chambers that are oil suction chamber and oil discharging
chamber. When the gear rotates as the direction shown in the figure, the right volume
increases and the vacuum is produced. The oil in the oil tank enters into the oil
suction chamber under the action of atmospheric pressure through pump oil suction
pipe to fill the gears. With the rotation of chamber, gears bring the oil into the left
chamber from right chamber to make the pressure of the left chamber increase and the
oil goes out from the oil discharging port. Because the gears keep going, the oil
suction port and oil discharging port keep sucking oil and discharging oil.
Figure 4-6-4 Gear pump working principle
4.6.3 Control valve
Control valve which achieves working devices lifting, front reach, tilting, side
shifting and hydraulic system protecting integrates pressure control, flow control and
direction control. The valve adopts proportion control and motor control. See figure
4-6-5 for its main structure and 4-6-6 for its explosive view.
Oil suction
Pressure oil
Summary of Contents for CQD16X1
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