As a type of pump, the internal gear pump works based on the internal meshing of gears, and has specific application characteristics and advantages. In the fuel supply system of automatic transmissions, internal gear pumps are widely used due to their compact structure, small size, and light weight. This type of pump is mainly composed of external gears, internal gears, crescent shaped partitions, pump casing, pump cover, etc. The gears are tightly installed in the inner cavity of the pump body. The external gears are the driving gears, the internal gears are the driven gears, and the crescent shaped partitions separate the two. The working process of an internal gear pump includes steps such as suction of liquid, hydraulic transmission, discharge of liquid, and cyclic reciprocating, achieving continuous delivery of liquid. twelve
A quantitative pump refers to a pump whose output flow rate remains constant and does not change with changes in system pressure. Internal gear pumps are usually designed as quantitative pumps, which means that their output flow rate is fixed and will not change due to changes in system pressure. This design enables the internal gear pump to perform well in applications that require stable flow output. thirty-four
In addition, internal gear pumps also have the advantages of compact structure, small size, and light weight. Due to the fact that the gears rotate in the same direction, the relative sliding speed is small, and the wear is slight, the pump has a longer service life. At the same time, the flow pulsation of the internal gear pump is much smaller than that of the external gear pump, so the pressure pulsation and noise are relatively small. These characteristics make the internal gear pump commonly used as a supplementary pump for the main pump in closed systems
