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In the previous section, we discussed the working principle of Rexroth gear pumps; in this section, we will look at the structure of such pumps. As we all know, Rexroth piston pumps come in various types such as axial piston pumps and radial piston pumps. What about Rexroth gear pumps? Rexroth gear pumps can generally be divided into Rexroth internal gear pumps and Rexroth external gear pumps. Let’s take a look at the features of Rexroth internal gear pumps. It has very low operating noise and minimal vibration. The seal gap compensation enables efficient operation at low speeds and with low viscosities, making it suitable for a wide range of speeds and viscosity levels. All standard installation and rating dimensions allow for compatibility with other components; it can be used in conjunction with vane pumps and axial piston pumps. The characteristics of Rexroth external gear pumps are as follows: A gear pump is a rotary pump that transports liquids or increases their pressure by utilizing the changes and movements in the working volume formed between the pump cylinder and the meshing gears. It consists of two gears, a pump body, and front and rear covers, creating two enclosed spaces. When the gears rotate, the volume of the space on the side where the gears are separated decreases and then increases, creating a vacuum that draws in the liquid. Meanwhile, the volume of the space on the side where the gears are in contact decreases, forcing the liquid into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of two gears. The pressure at the outlet of a gear pump depends entirely on the magnitude of the resistance at the pump outlet. The concept of a gear pump is quite simple: its most basic form consists of two gears of the same size that mesh with each other as they rotate inside a tightly fitting casing. The interior of this casing has an “8” shape, and the two gears are placed within it, with their outer diameters and sides fitting tightly against the casing. The material coming from the extruder enters between the two gears at the inlet and fills this space; as the gears rotate, it moves along the housing, and is finally discharged when the two gears mesh. In technical terms, a gear pump is also known as a positive-displacement device; it functions like a piston inside a cylinder, and as one tooth enters the fluid space occupied by another tooth, the liquid is mechanically forced out. Since liquid is incompressible, the liquid and the tooth cannot occupy the same space at the same time; as a result, the liquid is pushed out. Due to the continuous meshing of the teeth, this phenomenon occurs continuously, thereby providing a steady discharge volume at the pump’s outlet; the amount discharged is the same with each rotation of the pump. As the drive shaft rotates continuously, the pump also continuously discharges fluid. The flow rate of the pump is directly related to its rotational speed. The above is Otos’ explanation of the structure of Rexroth gear pumps. If you have any other questions, if finding this information difficult to understand, or if you would like a technician to assist you with the selection process, please contact Otos’ customer service – we will assign a technician to help you!