Thin‑Section Bearings for Humanoid Robot Joints

Lightweight, High‑Rigidity Integrated Drive Components

I. Precisely Addressing the Design Challenges of Humanoid Robot Joints

Humanoid robots contain dozens of moving joints, each with extreme constraints on space and weight. Conventional bulky bearings not only occupy valuable real estate but also increase joint inertia, leading to sluggish response, higher energy consumption, and compromised endurance and dynamic performance. Our 67/68/69Series Flanged Thin‑Section Bearings are purpose‑engineered for robotic actuators. With an ultra‑thin constant‑section design, they achieve the ideal balance between compactness, light weight, and high rigidity—fundamentally freeing joint design from traditional trade‑offs.

II. Four Core Product Advantages

1. Ultra‑Thin Compact Structure – Maximizing Internal Space

The bearing cross‑section is exceptionally slim, with widths ranging from just 4 to 18 mm. The large hollow inner diameter reserves ample space for cable routing, sensor integration, and harmonic drive mounting. The integral outer flange eliminates the need for separate housings—direct bolt‑on fixation greatly simplifies overall structural design and assembly.

2. Extreme Lightweight – Boosting Motion Agility

Compared to standard bearings of the same bore size, our bearings are over 25% lighter, significantly reducing joint inertia. This enables faster walking, grasping, and turning motions, while effectively extending battery life under the same capacity.

3. High‑Rigidity Precision Rotation – Smooth, Jitter‑Free Motion

Raceways are micro‑ground to P4/P5 precision grades. The bearings simultaneously support radial, bidirectional axial, and tilting moment loads, effortlessly absorbing walking impacts and payload overturning moments. They ensure accurate repeatable positioning and zero backlash, no vibration over long‑term reciprocating motion.

4. Multiple Sealing Options – Maintenance‑Free Long‑Term Operation

Available in open, metal shield (ZZ), and dual rubber seal (2RS/2RU) configurations. Sealed versions effectively block dust and prevent grease loss, making them ideal for continuous operation in indoor service robots and industrial humanoids.

5. Full Size Coverage – One‑Stop Matching for All Joints

The complete product line covers bore diameters from 10 to 90 mm—from miniature finger joints, wrist and elbow modules, to waist rotation and high‑load hip/knee joints, all matched with a single proven family.

III. Full‑Scenario Application Cases

Case 1 – Dexterous Gripper Finger Joints

Our 67 Series ultra‑thin miniature flanged bearings fit into extremely confined finger linkages, successfully integrating tactile sensing modules. Low‑friction rotation ensures gentle, precise gripping of glass, precision parts, and everyday objects—with smooth, accurate motion and zero deviation.

Case 2 – Wrist/Elbow Actuator Modules

68 Series bearings directly couple to harmonic drive outputs, eliminating retaining rings and housings. This significantly improves assembly efficiency. In multi‑DOF pitch and rotation motions, they deliver stable performance with repeatable positioning accuracy as high as 0.01 mm.

Case 3 – Waist Rotation Joint

Large‑size 69 Series thin‑section bearings reliably support the entire upper‑body weight. They enable smooth 360° rotation with no wobble, ensuring stable posture during rapid torso turns and directional changes without any frame vibration.

Case 4 – Hip and Knee Load‑Bearing Joints

The wide‑version 69 Series bearings feature optimized ball arrangements that substantially increase dynamic and static load capacities. In rigorous tests involving walking, squatting, and jumping impacts, they have successfully passed 500,000‑cycle endurance tests with zero failures, significantly reducing after‑sales maintenance costs.

IV. Measurable Customer Results

A mass‑production service humanoid robot manufacturer switched entirely to our domestic flanged thin‑section bearings and achieved remarkable performance and cost improvements:

• Performance Leap: Per‑joint weight reduced by 32%; overall motion response speed increased by 28%.

• Efficiency Gain: Internal wiring space noticeably expanded; total assembly time shortened by 20%.

• Cost Optimization: Procurement costs for core drive components reduced by 35%; performance fully comparable to imported thin‑section bearings, with lead times cut in half.

Thin Section Ball Bearings Dimension Chart