A New Generation of Compact Precision Reducers
Created by the Triple Crown Gear
Long Lifespan × High Torque
CROWN ROBOXGEAR

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Robust and Powerful Precision Compact Reducer

The Crown Roboxgear, a nutation reducer, adopts the Crown Reduction Mechanism, a simple gear configuration consisting of three rigid gears: the rotor gear, stator gear, and output gear. Compared to planetary gear mechanisms, oscillating reducers, and harmonic reducers, it is a new type of reducer for the robotic era that strikes a balance between compactness, robustness, and longevity.

Operating Mechanism

1

The outer side of the rotor gear contacts the stator gear whereas the inner side of the rotor gear contacts the output gear.

2

The motor’s rotational movement is transmitted through the press rotor and converted into the rotor gear’s precessional motion.

3

The precessional movement of the rotor gear, engaging with the stator gear with a different tooth count, causes deceleration, which is then transferred to the output gear to perform the reduction operation.

The “robustness” required for precision compact reducers in the era of small robots means powerful torque, high rigidity for shock resistance, and longevity to operate continuously in high-load environments.

Robustness

High Torque

Increased rated torque for the reducer to maximize small motor power (double the torque for the same size)

Shock Resistance

Instantaneous Maximum Torque: 45Nm (for the 30-mm external dimension type)

Longevity

High Load Resistance

Rated Torque: 3Nm (for the 30-mm external dimension type)

The Optimal Reducer for Miniaturization and Lightweighting

To achieve a large reduction ratio in small precision reducers that require precise control, it is common to use a differential gear reducer mechanism with a large reduction ratio per tooth. Among these, the Crown Reduction Mechanism, classified as a nutation reducer, is structurally suitable for miniaturization, offering high torque while maintaining positional accuracy during actual operation. The Crown Roboxgear has been further refined to create an ultra-compact yet powerful reducer ideal for various use cases, such as small robots.

Simple Gear
Configuration
Precise
angle control
Low backlash
Backdrivable

High-Load Torque Lifespan Test Data

The high-load torque lifespan test is a straightforward way to demonstrate strength and longevity. The rated torque is the value used when the total rotation count reaches 10⁹, and currently, it has achieved approximately double the strength of typical harmonic reducers. The testing is ongoing, with the final goal being to achieve double the current rated torque.