LZ6425 Hollow-Shaft Lightweight Joint Reducer

The core technology of the product lies in the harmonic integrated joint module, featuring a drive-control integrated design. The inner rotor structure enables hollow cabling, while diversified model options including 11, 14, 17, 20, 25, 32 and 40 series ensure flexible applications. With a compact and miniaturized profile and low power consumption, it adopts a pin-type brake mechanism that triggers mechanical locking instantly upon power loss, with an action time of less than 10ms.

The dual steel wheel design, integrating cross-roller bearings with steel wheels, reduces axial space occupation. By meshing two steel wheels with one flexspline, it mitigates stress from flexspline deformation, achieving smooth operation, high efficiency and positioning accuracy up to 20 arcseconds.

With an outer diameter of only Ø70mm and an overall axial length of just 24.5mm, this is an ultra-thin joint reducer that perfectly fits the tight installation spaces of humanoid or exoskeleton joints.

It integrates a flange output, motor mounting interface, and encoder mounting reference, achieving an integrated “reducer + output flange + mounting base” design, thereby reducing the number of parts in the joint module and minimizing cumulative errors.

High-precision Positioning Interface

Inner bore:Ø11H7 (+0.021/0), serving as the mounting reference for the motor shaft/encoder shaft, with tolerance controlled at IT7 level to ensure concentricity.

Output flange:Ø75g6(-0.025/-0.041), providing a high-precision outer-circular positioning reference for installation on the load side.

The distribution of threaded holes on the end face (3-Ø3H7, 6-M3, 6-M4) takes into account the installation requirements of both the encoder and the load end. Moreover, it adopts an EQS (equally spaced) design, ensuring uniform stress distribution and minimizing installation positioning errors.

Lightweight Design

Weighing only ≤378g, this significantly reduces the inertia of the joint module, enhances dynamic response speed, and alleviates the self-weight burden on exoskeletons/robots.

Protection rating IP54, providing protection against splashing water and dust, suitable for use in non-severe industrial environments for exoskeletons and collaborative robots.

Design life ≥ 20,000 hours, featuring lifetime lubrication (Life Lubrication), maintenance-free operation, and reduced long-term operating costs.

Environmental Adaptability

Operating temperature:-20°Cto 90°C, covering all operating conditions—from low-temperature outdoor environments to high-load, high-heat scenarios.

Low-noise design:Operating noise ≤ 63 dB(A), suitable for human-machine collaboration, exoskeletons, and other noise-sensitive applications.

Maximum radial force:800 N; maximum axial force: 600 N. The component can withstand eccentric loads and axial impacts on the joint module, and its structural rigidity meets application requirements.

Dual-encoder Compatible Design

The input side is equipped with a central through-hole of Ø11, supporting the installation of wire-through encoders and facilitating a dual-encoder layout on both the motor side and the output side.

High-precision positioning holes (Ø3H7+0.01) evenly distributed on the end face provide a reference for the installation of the encoder's magnet/sensor, ensuring accurate angular detection.

Standardized Installation Interface

The flange and motor mounting hole dimensions are industry-standard sizes, allowing direct compatibility with mainstream small brushless motors and load-end joint structures available on the market, thereby reducing customization development costs.

Low Inertia, High Responsiveness

The no-load torque at the high-speed end is ≤0.1 Nm, with a backlash of 8′. The joint module exhibits no noticeable jerking during startup or direction changes, and features rapid control response, making it ideal for high-dynamic motion applications.