What is the gerotor mechanism?

Think of a gerotor as a tiny, clever engine inside a housing - simple geometry doing useful work. At its heart are two toothed parts: a smaller inner rotor (the "star") and a larger outer rotor (the ring). The inner rotor rides off-center inside the outer one, and as it orbits, the gaps between their teeth open and close. Those changing gaps form small chambers that suck fluid in when they expand and push it out when they shrink. That's how a gerotor pumps fluid - or, run it backward, how fluid turns it into rotation and makes a motor.

How it actually works, in plain terms:

The inner rotor has fewer teeth and turns eccentrically inside the outer rotor, which has one more tooth.

As the inner rotor orbits, a series of sealed chambers are formed between teeth.

Where the chamber grows, it draws fluid in; where it shrinks, it forces fluid out.

The tooth shapes are matched (conjugate profile) so the seal between the two rotors stays tight and motion stays smooth.

Why people like gerotors

They're compact, quiet, and reversible. Because the moving parts are balanced and enclosed, gerotors are great where you need a small, reliable pump or a compact hydraulic motor - from engine lubrication to farm machinery and steering systems.

Why manufacturing matters (and where we come in)

A gerotor only works well when the parts are made with tight tolerances and perfect tooth profiles. That's our specialty. At our factory we focus on machining gerotor and geroler sets to world-class precision and we hold our own design patents. Tight fits and precise conjugate profiles mean higher efficiency, less leakage, longer life, and smoother operation - exactly what customers building hydraulic motors need.