Input shaft: connects to the motor or other power source, transmitting input power.

　　Input shaft: connects to the motor or other power source, transmitting input torque.

　　Helical gears are the core transmission components of a gearbox, achieving speed reduction and torque multiplication through gear meshing. The helix angle of helical gears is designed to enhance transmission smoothness and reduce noise.

　　Output shaft: Transmits the power, which has been reduced in speed and amplified in torque, to the load device.

　　Bearings: Support the input and output shafts and reduce friction and wear during rotation.

　　Housing: Protects the internal gears and other transmission components, and provides space for lubricant storage.

　　Lubrication system: Includes lubrication oil passages and an oil sump, designed to lubricate and cool internal transmission components, reduce wear, and extend service life.

　　Transmission components: The primary transmission elements inside a helical gear reducer are gears, which not only transmit motion but also transmit power. In enclosed drives, the gears are housed within a rigid casing, ensuring adequate lubrication and optimal operating conditions.

　　Shaft: The shaft is a critical component that supports rotating machine parts and transmits torque. In helical gear reducers, shafts are typically stepped, and they are usually connected to transmission components via flat keys.

　　Bearing assembly: Includes bearings, bearing caps, and sealing devices. Rolling bearings, owing to their low friction, high motion accuracy, and ease of maintenance, are widely used in gear reducers.

　　Box body

　　Material: The housing is typically manufactured from gray cast iron, which offers excellent casting and vibration‑damping properties, making it well suited for mass production. For applications involving heavy loads or impact loading, a steel‑cast housing may also be used.

　　Structural configuration: From a structural standpoint, housings can be classified as split-type or monolithic. Helical gear reducers typically employ split-type housings to facilitate assembly and maintenance.

　　Attachment

　　Sight glass and sight glass cover: Used to inspect the meshing condition and lubrication status of transmission components.

　　Drain hole and drain plug: Located at the lowest point on the bottom of the housing base to facilitate the discharge of oil contaminants.

　　Vent: Installed on the top of the enclosure cover or the inspection port cover, it allows hot‑expanding gases inside the enclosure to escape, thereby maintaining pressure equilibrium between the interior and exterior.

　　Cover‑removal screws and locating pins: The cover‑removal screws facilitate the removal of the housing cover, while the locating pins ensure the fit accuracy of the bearing housing bore.

　　Modular design

　　Convenient Combination: Helical gear reducers can be paired with modular AC motors or servo motors to form helical gear‑motor units or helical gear‑servo motor units.

　　Wide speed ratio range: Single-stage and multi-stage gear reducers offer finely graded torque values and transmission ratios, meeting the requirements of diverse applications.

　　Multi-stage transmission: To increase the reduction ratio and torque multiplication, helical gear reducers typically employ a multi-stage design. Each stage consists of one or more pairs of helical gears, and continuous meshing across multiple stages achieves both speed reduction and torque amplification.

　　Compact Design: Helical gear reducers typically feature a modular design, resulting in a compact structure that occupies minimal space. Moreover, by optimizing gear parameters and housing geometry, the reducer’s load-carrying capacity and transmission efficiency can be further enhanced.

　　High-precision machining: The gears and other transmission components of helical gear reducers must undergo high-precision machining to ensure smooth and reliable operation. In addition, rigorous heat treatment is required to enhance the material’s hardness and wear resistance.