trochoidgerotor

The trochoidgerotor is a type of positive displacement machine, often used as a pump or motor, characterized by its unique internal geometry. It consists of two interlocking, epitrochoidal gears. One gear, the rotor, is typically a simple epitrochoid with an odd number of lobes, while the inner gear, the gerotor, has one fewer lobe and is internally toothed. The gerotor orbits around the rotor in a specific path.

The operation of a trochoidgerotor relies on the creation of sealed volumes between the rotor and gerotor. As the gerotor orbits, these volumes expand and contract. In pump applications, fluid enters the expanding chambers and is trapped and then expelled as the chambers contract. In motor applications, pressurized fluid entering the expanding chambers forces the gerotor to orbit, generating rotational motion. The precise meshing and eccentric motion of the gears are crucial for efficient operation and sealing.

Trochoidgerotors are known for their compact size, high volumetric efficiency, and relatively simple construction. They are commonly found in various applications, including hydraulic systems, lubrication systems, and fuel pumps. The specific shape of the epitrochoid curve can be varied to achieve different flow rates and pressure characteristics. The inner gerotor gear also exhibits a planetary motion as it orbits the rotor.