1) Descriptions of Internal Spur Gear

From the perspective of compact space transmission, an internal gear is a type of gear whose teeth are distributed along the inner surface of a ring-shaped component. Typically used in conjunction with external gears (such as pinions or planetary gears), it enables power transmission and speed conversion within limited spatial constraints.

2) Features of Internal Spur Gear

Characterised by an ‘internal meshing’ transmission structure, where the outer gear is nested within the inner gear, resulting in a compact overall footprint; Advantages include a reduced centre distance, significantly diminishing the volume of the equipment's transmission system. Furthermore, the direction of tooth surface contact during internal meshing is more optimal, resulting in superior transmission smoothness compared to externally meshed gears of the same specification. Operational noise levels are notably lower (typically 5-10dB quieter than externally meshed gears).

3) Applications of Internal Spur Gear

Suitable for applications with stringent volume constraints, such as planetary gear mechanisms in automotive automatic transmissions (where the inner gear serves as the ring gear), compact reducers (e.g., robotic joint reducers), power tool drive systems, medical devices (e.g., wheelchair drive mechanisms), and micro-transmission modules within precision instruments.