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A complete hydraulic system mainly includes power components, actuators, control components, auxiliary components and other components. Among them, hydraulic pumps and hydraulic motors, as important power units and execution units, are regarded as the core of the hydraulic system.
Due to different working principles, application scenarios, etc., there are also certain structural differences between hydraulic pumps and hydraulic motors.
(1) Differences in structural design. Under normal circumstances, the hydraulic motor mainly adopts a symmetrical design to meet the needs of forward and reverse operation, while the hydraulic pump mainly outputs hydraulic energy outwards and mainly adopts a one-way structural design. Under special circumstances, there is also a bi-directional structural design.
(2) Requirements for bearings are different. The rotation speed of hydraulic motors is adjusted by hydraulic energy, and the starting torque is large. Moreover, it usually needs to meet both low-speed and high-speed rotation requirements. Hydrostatic bearings or hydraulic bearings are mostly used. For bearing load-bearing requirements, The requirements are relatively high. The speed of the hydraulic pump is regulated by electric energy, and the speed is relatively fixed. The requirements for the bearing capacity are low.
(3) The oil suction and oil discharge mechanisms are different. The hydraulic pump converts low-pressure oil into high-pressure oil through the rotation of the motor. It needs to reduce the oil suction resistance to improve work efficiency. Therefore, the diameter of the oil suction mechanism is often larger than the oil outlet diameter. At the same time, the hydraulic pump also requires functions such as self-priming oil, while the hydraulic motor does not have these requirements. .
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