A few people who are engaged in hydraulic pump maintenance work should be able to discover that during hydraulic pump maintenance, a starting characteristic of the hydraulic pump will be found. What is the startup feature? What are the requirements for the starting characteristics of hydraulic pumps when servicing them? Otto will give you a detailed explanation.

Hydraulic pump, motor repair

In most mechanical equipment, the hydraulic pump often starts, stops, rotates forward, and reverses with load. Under such frequent alternating use conditions, the starting performance of the hydraulic pump should meet the condition that the load is full torque or allowable torque. Reliable start at any corner position.

Starting characteristics are measured by starting torque and starting mechanical efficiency.

Under the rated pressure, the torque on the output shaft when starting from a stationary state is called the starting torque of the hydraulic pump, that is, the output torque of the shaft after the friction loss is overcome during the starting process of the hydraulic pump. After passing pressure oil, the hydraulic pump must overcome static friction from standstill to start of motion. That is, after the pressure oil is applied, the output shaft is rotated through a small pre-tensioning corner to overcome the gap between the movable parts and the elastic deformation of the parts, so that the load of the hydraulic pump is in the pre-tension state before starting

At this time, Coulomb friction is generated between the relative sliding surfaces, and the friction is gradually increased, and the output torque is gradually reduced. When the friction is fully established, the output torque tends to a certain value, which is the starting torque, hydraulic pressure The force enables the hydraulic pump to overcome the friction and realize the start under load.

Starting mechanical efficiency, also known as starting torque efficiency, refers to the ratio of the starting torque of the hydraulic pump to the theoretical torque when the hydraulic pump is started from a stationary state.

The starting torque and mechanical efficiency of the hydraulic pump are affected by internal friction and torque pulsation. When the output shaft is started at different positions (phase angles), the starting torque is also slightly different.

Rexroth reducer repair

In actual work, I hope that the starting performance is better, that is, the starting torque and starting mechanical efficiency should be as large as possible. For different types of hydraulic motors, the starting mechanical efficiency (starting torque efficiency) is different.

The starting characteristics of hydraulic pumps with different structures are different, and the key points to be considered are also different when they are in the maintenance operation of hydraulic pumps. But we can adjust the starting characteristics by controlling the starting mechanical efficiency or starting torque. The starting characteristics of hydraulic pump repairs may not be known to many people who are in hydraulic pump repair work. However, our hydraulic repair center, as a company with more than ten years of hydraulic repair experience, has already taken these into consideration.