Hydraulic motor and hydraulic pump are similar to each other

Hydraulic pump and hydraulic motor are similar to two brothers, both in the work combination or in the composition of their own, there is a big similarity between them, this article according to the similarities and differences of the two are analyzed, for your users reference.

One, the same point

1, which is similar in principle: hydraulic motor and hydraulic pump is reversible, if driven by a motor, the output is the hydraulic (pressure and flow), which is a hydraulic pump; if the input pressure oil output mechanical energy (torque and speed), a hydraulic motor. In fact, the two are similar in terms of structure.

2, the working principle is similar: the two are the use of sealing work volume changes for oil absorption and discharge of oil. For hydraulic pumps, when the working volume increases, the oil absorption and the working volume are reduced to discharge the high pressure oil. For hydraulic motor, when the working volume increases, it enters high pressure oil and reduces the working volume to discharge low pressure oil.

Two, different points:

1, the hydraulic motor output shaft must be able to turn forward and reverse, so its structure is symmetrical; and some hydraulic pumps (such as gear pumps, vane pumps, etc.) steering has clearly defined, only one-way rotation, can not arbitrarily change the direction of rotation;

2, hydraulic pump is the conversion of mechanical energy to hydraulic energy conversion device, output flow and pressure, hope volume efficiency is high; hydraulic motor is the liquid pressure can be converted to mechanical energy device, output torque and speed, hope the mechanical efficiency is high. Therefore, the hydraulic pump is an energy device, and the hydraulic motor is the actuating element;

3. The volumetric efficiency of the hydraulic motor is lower than that of the hydraulic pump;

4, the hydraulic motor in addition to the inlet and outlet, there is a separate leakage of oil; hydraulic pump is generally only inlet and outlet (axial piston pump except), the internal leakage of oil leakage and the inlet port.

Usually, the working speed of the hydraulic pump is higher, and the output speed of the hydraulic motor is low. In addition, the suction port of the gear pump is big, the oil discharge port is small, and the suction and discharge ports of the gear hydraulic motor are the same;

The gear number of the gear motor is more than that of the gear pump; the blade of the vane pump is inclined to be installed, and the blade of the vane motor is installed radially;

The vane of the vane motor depends on the swallow spring of the root to compress it on the stator surface, while the vane of the vane pump is pressed on the stator surface by the pressure oil and the centrifugal force acting on the root.

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