Introduction And Classification Of Hydraulic Motors

    A hydraulic motor is an actuator of a hydraulic system that converts the liquid pressure supplied by the hydraulic pump into the mechanical energy (torque and speed) of its output shaft. Hydraulic motors are also known as oil motors, mainly used in injection molding machines, ships, hoisting machines, construction machinery, construction machinery, coal mining machinery, mining machinery, metallurgical machinery, ship machinery, petrochemical, port machinery. High-speed motor gear motor with small size, light weight, simple structure, good process, the oil pollution is not sensitive, impact resistance and inertia small and so on. Disadvantages are large torque ripple, low efficiency, starting torque is small (only 60% of rated torque - 70%) and low stability and poor stability.Hydraulic Motor  From the point of view of energy conversion, the hydraulic pump and the hydraulic motor are reversible hydraulic components, to any kind of hydraulic pump input working fluid, can make it into hydraulic motor conditions; the other hand, when the hydraulic motor spindle from the outside When the torque is driven, it can also become a hydraulic pump condition. Because they have the same basic structural elements - closed and can be cyclically variable volume and the corresponding oil distribution mechanism.Hydraulic Motor   However, due to the hydraulic motor and hydraulic pump operating conditions are different, their performance requirements are not the same, so the same type of hydraulic motor and hydraulic pump, there are still many differences. First, the hydraulic motor should be able to positive and reverse, thus requiring its internal structure symmetry; hydraulic motor speed range needs to be large enough, especially for its minimum stable speed has certain requirements. Therefore, it is usually used roller bearings or hydrostatic bearings; second hydraulic motor due to the input pressure oil conditions, and therefore do not have to self-absorption capacity, but the need for a certain initial sealing in order to provide the necessary starting torque. Because of these differences, the hydraulic motor and the hydraulic pump are structurally similar, but can not be reversible.Hydraulic Motor  Hydraulic motors are divided into gear type, blade type, plunger type and other type according to their structure type. According to the hydraulic motor rated speed is divided into high and low speed two categories. Rated speed higher than 500r / min are high-speed hydraulic motor, rated speed less than 500r / min are low-speed hydraulic motor. The basic types of high-speed hydraulic motors are gear type, screw type, blade type and axial plunger type.