The basic structure of the NMRV reducer (also known as the RV reducer) primarily consists of a worm gear and worm, shafts, bearings, the housing, and associated accessories. It can typically be categorized into three fundamental structural sections: the housing, the worm gear and worm assembly, and the bearing and shaft assembly. Its key components include oil seals, oil plugs, the worm gearbox (housing), ball bearings, the output shaft, the worm gear, the worm, the motor connection plate (flange), the output shaft cover, fasteners (such as hex socket head screws), keys (such as double-radius keys), gaskets, and similar items. The housing serves as the mounting base for all components; its function is to support and secure the shaft system components, ensure the correct relative positioning of the various transmission parts, and withstand operational loads. The worm gear and worm pair constitutes the core transmission component, responsible for transmitting motion and power between two non-intersecting shafts. The bearing and shaft assembly functions to support the rotating components, transmit power, and ensure smooth, efficient operation.

Main Materials: Depending on the frame size specifications, the housing (body) is manufactured using either die-cast aluminum alloy (for frame sizes 025–090) or cast iron (for frame sizes 110–150). Aluminum alloy housings typically undergo sandblasting, surface finishing, and specialized anti-corrosion treatment, or are coated with RAL5010 blue baked enamel; cast iron housings are coated with RAL5010 blue baked enamel. The worm is typically manufactured from 20Cr steel; after undergoing carbon-nitrogen co-nitriding treatment and precision grinding, its tooth surface maintains a high level of hardness. The worm gear is manufactured using a specially formulated, wear-resistant nickel-bronze alloy.