Why Are Gear Racks Used in Mechanical Transmission?

Because gear racks are best at one thing: converting rotational motion into linear motion and vice versa.

For example, when a motor drives a gear, the gear rack moves in a straight line; conversely, when the gear rack is pushed, it can also drive the gear to rotate. Mechanical systems often use it for the following reasons:

1. Long travel: The gear rack can be connected piece by piece, and gantry machines and large slide tables rely on it to move for tens of meters.

2. High rigidity: Unlike belts which can slacken or stretch, it is strong and stable under force, suitable for heavy loads.

3. High efficiency: The transmission efficiency is usually over 90%, and the power is rarely wasted.

4. Precise positioning: CNC machines and automated equipment rely on it for precise linear control.

Common scenarios include the movement of the worktable of CNC machines, car steering (when the steering wheel is turned, the gear rack drives the wheels to turn), robots and elevators. However, it also has drawbacks: when meshing, the teeth enter and exit together in their full width, which is prone to impact and produces noise. Therefore, in high-speed and heavy-load situations, helical gear racks are generally used, with smoother contact and lower noise.

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