Comparison of Characteristics and Application Scenarios of Common Reducers
The reducer mainly achieves power transmission by reducing speed and increasing torque, and different structural designs make it suitable for diverse scenarios:

1. Overview

characteristic:

Small size and light weight: With a compact structure, it is suitable for scenes with limited space.

High precision: The transmission error can be controlled within 1 arc minute, suitable for high-precision motion control.

Low load capacity: suitable for light load scenarios such as robot arms and wrists.

Short lifespan: Due to the periodic deformation of flexible gears, their lifespan is usually lower than that of RV reducers, but domestic manufacturers have significantly improved their lifespan.

Application scenarios:

Humanoid robots: Tesla Optimus and other robots that require lightweight design with rotating joints.

Industrial robots: lightweight load-bearing parts such as arms, wrists, and hands.

Medical equipment and semiconductor equipment: precision instruments that require high precision.

High precision dynamic control: prioritize planetary gearbox (universal) or harmonic gearbox (lightweight robot).

Heavy duty high rigidity requirements: Choose RV reducer (such as industrial robot joints).

Low cost universal scenarios: gear reducers (high efficiency) or worm gear reducers (when self-locking is required).

harmonic drive

A harmonic reducer consists of a fixed internal toothed rigid wheel, a flexible wheel, and a wave generator that causes radial deformation of the flexible wheel. The harmonic reducer uses the flexible gear to generate controllable elastic deformation waves, causing relative misalignment between the teeth of the rigid wheel and the flexible wheel to transmit power and motion. When the wave generator rotates, the flexible wheel meshes with the rigid wheel in the long axis direction and separates in the short axis direction, achieving deceleration through continuous deformation. The reduction ratio is determined by the ratio of the number of rotations between the wave generator and the flexible wheel, and can usually reach 70-320 (single-stage)

rv reducer

A two-stage reduction method is used, consisting of a front stage planetary gear set, a rear stage cycloidal pinwheel set, and a crankshaft connecting the two stages. The first stage is reduced by planetary gears, and the input shaft drives the sun gear, which drives the planetary gear to rotate around the inner gear ring. The second stage is reduced by cycloidal pinwheel, and the eccentric motion of the crankshaft causes the cycloidal gear to mesh with the pinwheel, offsetting radial runout through phase difference and achieving secondary reduction.

characteristic:

High rigidity and high load: Adopting a cycloidal pinwheel structure, it can withstand heavy load impacts and is suitable for high torque scenarios.

High precision: The transmission accuracy is slightly lower than that of harmonic reducers, but the stability is strong.

Complex structure: High manufacturing process requirements, dependence on imported equipment (such as gear grinders), and high cost.

Long lifespan: The design lifespan usually reaches tens of thousands of hours, suitable for long-term operation in industrial scenarios.

Application scenarios:

Industrial robots: Heavy load parts such as the arms and shoulders of multi joint robots.

Heavy machinery: transmission systems for cranes and construction machinery.

characteristic:

Medium load capacity: Power is transmitted through multi-stage planetary gears, suitable for medium torque scenarios.

Low cost: The structure is relatively simple, easy to mass produce, and the price is economical.

Larger volume: Due to the multi-stage gear structure, the volume and weight are larger than those of harmonic reducers.

Strong universality: It can adapt to various types of motors and has a wide range of applications.

Automated production line: industrial equipment with high load and continuous operation.

Planetary reducer

A planetary carrier consisting of a sun gear, planet gears, a fixed outer gear ring gear, and a planetary gear planetary gear connecting the planet gears to revolve around the sun gear. The planet gears revolve around the sun gear and rotate on their own, dispersing the load through multi-stage gear meshing. The reduction ratio is determined by the gear ratio between the sun gear and the planet gears, and multi-stage series connection can improve the reduction ratio to 1500

General industrial equipment: such as CNC machine tools, packaging machinery, logistics sorting systems.

New energy vehicles: power matching between the drive motor and the wheels.

Aerospace: Transmission devices for auxiliary power systems.