How does a Rexroth gear pump work?

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We have provided detailed explanations of the working principles of both Rexroth piston pumps and Rexroth vane pumps; so why is there no such explanation for Rexroth gear pumps? Today, Autos will provide a detailed explanation of the structure and working principle of Rexroth gear pumps. 　　The new product launched by Rexroth in 2011 is, according to Zhonghui Hydraulics, the PGM type gear pump. What sets this gear pump apart from the previous PGH series gear pumps is that the PGM series are medium-pressure gear pumps, whereas the PGH series are high-pressure gear pumps. The features of the PGM type are: 1. Fixed displacement, 2. Low operating noise, 3. Low flow pulsation, 4. High efficiency even at low speeds and with low-viscosity oils due to seal clearance compensation, 5. Suitable for a wide range of viscosity and speed levels, 6. All model specifications and displacement options can be combined with each other, 7. Can be used in combination with internal gear pumps PGF, vane pumps, and axial piston pumps, 8. Suitable for use with HFC hydraulic oil (seal type “W”). The previous points show that it shares the same characteristics as PGH series gear pumps. 　　Structure of Rexroth gear pumps 1) Plunger pump: It operates by causing the plunger to move back and forth due to the plunger cylinder being tilted at an angle relative to the drive shaft. Flow regulation is achieved by adjusting the angle of the swinging plunger cylinder, which is why it is also known as a swing-cylinder type. Compared to the swashplate type, it offers reliable operation and a high flow rate, but its structure is complex. Compared to radial piston pumps, axial piston pumps have a higher discharge pressure; they can generally operate within the range of 20–50 MPa. They also offer high efficiency, along with a small radial dimension, a compact structure, low volume, and light weight. However, its structure is more complex than that of a radial piston pump, it requires higher manufacturing standards, and its price is higher. 　　2) All REXROTH vane pumps are horizontal centrifugal pumps with a single pump casing structure. A special clamp is used to secure the pump body and the pump cover, allowing the outlet direction of the pump to be set at any position within 360 degrees, which facilitates installation and use. The bearing assembly of the sand pump features a cylindrical structure, which facilitates adjusting the gap between the impeller and the pump body; it can be removed as a whole during maintenance. The bearings are lubricated with grease. The shaft seal types for sand pumps include packing seals, impeller seals, and mechanical seals. The sand pump features a wide flow channel, good cavitation resistance, high efficiency, and corrosion resistance. 3) The Rexroth gear pump operates on the principle of internal gear meshing; the pitch circles of the inner and outer gears are close to each other, while the other side is separated by a \"crescent plate\" on the pump cover. The driving internal gear on the main shaft causes the internal and external gears to rotate in the same direction; at the inlet, the gears separate from each other, creating negative pressure that draws in the liquid. At the outlet, the gears continuously mesh with one another, forcing the liquid out. Due to this unique structure, it is particularly suitable for transporting media with high viscosity; the viscosity range is 0.2–1,000,000 cp. Reverse transportation is possible by simply changing the direction of the motor ； The Rexroth internal gear pump body is rotatable, with the inlet and outlet positioned at right angles, facilitating the selection of the appropriate inlet and outlet positions ； The Rexroth gear pump has convenient inlet and outlet connections for insulation or cooling medium between the pump body, end caps, and bearing housings. REXROTH gears have the advantages of no oil trapping, smooth operation, high efficiency, low noise, and a long service life. Internal gear pumps are suitable for transporting Newtonian or non-Newtonian liquids in industries such as petroleum, chemicals, coatings, dyes, food, fats, and pharmaceuticals. The types of liquids that can be transported range from light, volatile liquids to heavy, viscous liquids, and even semi-solid liquids. The above content explains the working principle of Rexroth gear pumps, as presented by the technical staff of Shenzhen Autosys Hydraulic Machinery Co., Ltd. As a professional agent for Rexroth piston pumps, we offer a comprehensive range of products. You can visit our official website at http://www.aotuoshi.com/ to learn more relevant information