Types and characteristics of Rexroth gear pumps

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

Classification and structural characteristics of Rexroth gear pumps

Types and characteristics of Rexroth gear pumps

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

According to the different tooth curves, it can be divided into: involute and cycloid.

According to the surface form, it can be divided into spur gear type, helical gear type, herringbone gear type and arc gear type.

Depending on the number of meshing gears: two-gear and multi-gear.

According to the number of gear stages, it is divided into single-stage gear pump and multi-stage gear pump.

Rexroth gear pump has simple structure, convenient processing, small size, light weight, strong self-priming ability, insensitive to oil pollution, and is widely used. China's gear pump industry has two major competitive advantages: one is a low-cost competitive advantage; On the other hand, the rapid growth of the domestic construction, petroleum, petrochemical and environmental protection markets and major water diversion projects have also provided important support for the development of China's gear pump industry. China's growing market space is the premise for the domestic gear pump industry to maintain its advantage. However, the radial force is unbalanced, the flow artery is large, the noise is large, the bearing life is short, the parts are poorly interchangeable, it is not easy to repair after wear, and the displacement is not adjustable, so that the use range of the gear pump is limited. The pump cannot be changed.

The characteristics of Rexroth gear pumps are as follows.

Good self-priming performance.

The direction of the exhaust depends entirely on the direction of rotation of the pump shaft.

The pump flow is small and continuous, but there is pulsation and noise; The pulsation rate is between 11% and 27%, and the inhomogeneity is related to the number and shape of the gear, the heterogeneity of the helical gear is less than that of the spur gear, and the inhomogeneity of the herringbone gear is less than that of the helical gear, and the less the number of teeth, the greater the pulsation rate.

The size and speed of the theoretical flow working parts are determined independently of the discharge pressure; The discharge pressure is related to the load pressure.

Simple structure, low price, few wearing parts (no suction and discharge valve), impact resistance, reliable work, can be directly connected to the motor (no deceleration device)

There are many friction surfaces, which is not suitable for conveying liquids containing solid particles, and is suitable for conveying oil.

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