Micro-Thin Seals for Humanoid Robots

Featuring a micro-thin design that does not occupy the limited installation space of humanoid robots, these seals serve as core components essential for achieving extreme compactness, lightweight construction, low energy consumption, and high protection in humanoid and biomimetic robots. Despite their ultra-thin cross-section, they simultaneously deliver low friction, long service life, dual sealing (oil-resistant and dust-resistant), and compatibility with high-frequency micro-oscillations.

Specifically designed for micro-joints, featuring a dual-lip design, ultra-thin cross-section, and low-tension springs or springless configurations to balance sealing performance with torque.

Structure

Primary Lip: Seals grease/oil; thin blade + low contact pressure

Secondary Lip: Dustproof/waterproof; light-touch, no preload/micro-preload

Cage: Ultra-thin, high-hardness cold-rolled steel

Spring: Micro-diameter, low-tension stainless steel wire

Articulated robots (humanoid/collaborative/dexterous hands) place far greater demands on seals than traditional industrial applications:

Space constraints: Extremely narrow joint/gearbox cavities

Complex motion: High-frequency reciprocating, oscillating, and bidirectional rotational movements; traditional oil seals are prone to wear and subject to high torque.

Stringent Performance Requirements: Low friction, low leakage, long service life, temperature resistance, oil resistance, and contamination resistance; suitable for -40°C to 200°C.

Lightweight Design: Every gram of weight affects payload and endurance; seals must be ultra-lightweight with no redundant structures.

Material    Core Advantages    Applications    Temperature Range

Modified HNBR    Low friction, oil resistance, low-temperature resistance, high elasticity Mainstream joints, -40°C to 120°C    -40°C to 120°C

FKM (Fluorocarbon rubber)    High-temperature resistance, media resistance, long service life    High-temperature/corrosive environments    -20°C to 200°C

PTFE    Ultra-low friction, self-lubricating, wear-resistant    High-speed/low-torque applications    -200°C to 260°C

Selection Steps

Determine shaft diameter/bore diameter/groove dimensions

Define motion type (rotation/oscillation), speed/acceleration, and temperature

Evaluate media (grease/oil) and environment (dust/water/corrosion)

Determine maximum allowable torque and protection rating

Select structure + material: Prioritize ultra-thin double-lip oil seals (dynamic)

Application Scenarios (Core Components of Humanoid Robots)

Micro harmonic/RV joints in humanoid robot wrists, hands, ankles, etc.

Small joint modules for collaborative robots, servo motor output shafts

Dexterous hands and micro-actuators for biomimetic robots

Precision rotational/oscillating components for medical/service robots

※UKS oil seals support full-range custom manufacturing. They can be tailored to equipment structure, operating conditions, and installation space to resolve issues such as standard part mismatches, seal failure, and installation constraints.