Rexroth hydraulic pumps - classification and structural features of gear pumps

Create Date: 2024-8-30 12:03:23|Source: Rexroth/Rexroth

1. According to the form of gear meshing, it can be divided into: external meshing and internal meshing

2. According to the tooth shape curve, it can be divided into: involute tooth form and cycloidal type

3. According to the form of the tooth surface, it can be divided into: spur gear type, helical gear type, herringbone gear type, arc tooth surface gear type

4. According to the number of meshing gears: two-gear type and multi-gear type

5. According to the number of gear stages, it can be divided into: single-stage gear pump and multi-stage gear pump

The gear pump has simple structure, convenient processing, small size, light weight, strong self-priming ability, insensitive to oil pollution, etc., so it is widely used. China's gear pump industry has two major competitive advantages: on the one hand, it has a low-cost competitive advantage; On the other hand, the rapid growth of the domestic construction, petroleum, petrochemical, environmental protection markets and major water diversion projects have also provided important support for the development of China's gear pump industry. China's continuous growth of market space is a prerequisite for the domestic gear pump industry to maintain its advantages.

However, the radial force is unbalanced, the flow artery is large, the noise is large, the bearing life is short, the interchangeability of parts is poor, it is not easy to repair after wear, and the displacement cannot be adjusted, so that the use range of gear pump is limited. It cannot be used as a variable pump.

It has the following characteristics

1. Good self-priming performance.

2. The direction of suction and discharge depends entirely on the direction of rotation of the pump shaft.

3. The flow rate of the pump is not large and continuous, but there is pulsation and noise; The pulsation rate is 11%-27%, and its unevenness is related to the number and shape of the gear, the unevenness of helical gears is smaller than that of spur gears, and the unevenness of herringbone gears is smaller than that of helical gears, and the fewer the number of teeth, the greater the pulsation rate.

4. The theoretical flow rate is determined by the size and speed of the working parts, and has nothing to do with the discharge pressure; The discharge pressure is related to the pressure of the load.

5. Simple structure, low price, few wearing parts (no need to set up suction and discharge valves), impact resistance, reliable work, and can be directly connected with the motor (no need to set up a deceleration device).

6. There are many friction surfaces, and it is not suitable to discharge liquids containing solid particles, but it is advisable to discharge oils.

Rexroth hydraulic pumps - classification and structural features of gear pumps

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