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Characteristics and classification of hydraulic gear motors
The hydraulic gear motor traditionally refers to an energy conversion device that outputs rotational motion and converts the hydraulic energy provided by the hydraulic pump into mechanical energy. From the perspective of energy conversion, hydraulic pumps and hydraulic motors are hydraulic components that work reversibly. Inputting working fluid to any hydraulic pump can turn it into a hydraulic motor working condition; on the contrary, when the main shaft of the hydraulic motor is external When the torque is driven to rotate, it can also be changed to the working condition of the hydraulic pump. Because they have the same basic structural elements, closed but cyclically variable volume and corresponding oil distribution mechanism.
However, due to the different working conditions of hydraulic gear motors and hydraulic pumps, their performance requirements are different, so there are still many differences between hydraulic gear motors and hydraulic pumps of the same type. First of all, the hydraulic motor should be capable of forward and reverse rotation, so its internal structure is required to be symmetrical; the speed range of the hydraulic gear motor needs to be large enough, especially for its minimum stable speed. Therefore, it usually adopts rolling bearings or hydrostatic sliding bearings; secondly, because hydraulic motors work under the condition of input pressure oil, they do not need to have self-priming ability, but a certain initial sealing is required to provide the necessary starting torque. Because of these differences, hydraulic gear motors and hydraulic pumps are similar in structure, but they cannot work reversibly.
Hydraulic gear motors can be divided into gear type, vane type, plunger type and other types according to their plum type. According to the rated speed of the hydraulic gear motor, it is divided into two categories: high speed and low speed. Those with a rated speed higher than 500r/min are high-speed hydraulic motors, and those with a rated speed lower than 500r/min are low-speed hydraulic motors. The basic types of high-speed hydraulic motors include gear type, screw type, vane type and axial plunger type.
However, due to the different working conditions of hydraulic gear motors and hydraulic pumps, their performance requirements are different, so there are still many differences between hydraulic gear motors and hydraulic pumps of the same type. First of all, the hydraulic motor should be capable of forward and reverse rotation, so its internal structure is required to be symmetrical; the speed range of the hydraulic gear motor needs to be large enough, especially for its minimum stable speed. Therefore, it usually adopts rolling bearings or hydrostatic sliding bearings; secondly, because hydraulic motors work under the condition of input pressure oil, they do not need to have self-priming ability, but a certain initial sealing is required to provide the necessary starting torque. Because of these differences, hydraulic gear motors and hydraulic pumps are similar in structure, but they cannot work reversibly.
Hydraulic gear motors can be divided into gear type, vane type, plunger type and other types according to their plum type. According to the rated speed of the hydraulic gear motor, it is divided into two categories: high speed and low speed. Those with a rated speed higher than 500r/min are high-speed hydraulic motors, and those with a rated speed lower than 500r/min are low-speed hydraulic motors. The basic types of high-speed hydraulic motors include gear type, screw type, vane type and axial plunger type.
