Industry: Elderly Care & Rehabilitation Equipment

Driven by material innovation, SAVI Intelligent Drive ensures reliable operation of medical equipment. The following case presents the typical application of SAVI bearings in the fields of medical rehabilitation and assistive mobility, covering three major working scenarios: linear drive systems, guide load-bearing structures, and joint hinges.

Application Equipment: Lower Limb Posture Rehabilitation Training Robot.

Required Products: SAVI-LIN-00 All-Plastic Linear Bearings.

Motion Mode: Vertical linear reciprocating motion.

Working Condition Characteristics: Clean environment, oil-free lubrication, low noise, lightweight, corrosion resistance.

1. Pain Points and Challenges

Risk of grease contamination: Traditional metal linear bearings rely on grease lubrication. In medical clean environments, grease leakage or volatilization may contaminate the treatment space.

Corrosion failure caused by disinfection: Medical equipment is frequently wiped with alcohol and chlorine-containing disinfectants. Metal bearings are prone to surface corrosion, which sharply increases the friction coefficient and causes mechanical jamming.

Noise affecting patient experience: Metal ball bearings generate rolling noise and structural resonance during low-speed reciprocating movement, compromising the comfort of rehabilitation training and the quietness of the treatment environment.

Conflict between weight and energy consumption: Metal bearings feature heavy self-weight, increasing the overall equipment weight, raising the driving energy consumption of the lifting motor, and shortening battery endurance.

High maintenance costs: Regular maintenance including oil filling and seal replacement requires professional personnel and equipment shutdown, resulting in increased operating costs.

2. Application Description

The all-plastic linear bearing is installed inside the vertical support column of the rehabilitation robot, undertaking the lifting adjustment function of the patient weight reduction system. During equipment operation, the bearing bears dynamic loads of 80-150kg from the patient’s weight to realize stable height adjustment, and cooperates with sensors to complete position feedback for gait training.

All-plastic structure: Abandoning the traditional metal ball retainer structure, it is integrally molded with modified engineering plastic to realize simplified structure and integrated functions, and is resistant to corrosion by alcohol and other disinfectants.

Inner wall groove chip removal design: The optimized axial guide grooves effectively remove dust and debris, avoid jamming caused by particle accumulation, and extend the maintenance-free service cycle.

Modified and reinforced material: The base material is modified with fiber reinforcement and solid lubricants, improving wear resistance and compressive strength while maintaining a low friction coefficient.

Medical-grade adaptation: Systematically optimized for medical clean environments, daily disinfection processes and low-noise requirements, it is not a simple replacement of general industrial parts.

3. Customer Values

Lubrication-free design completely eliminates the risk of medical environmental pollution.

Resistant to disinfectant corrosion, fully adapting to daily hospital cleaning and disinfection procedures.

Low-noise operation optimizes patients’ rehabilitation training experience.

80% lighter weight than metal bearings, reducing equipment driving energy consumption.

Inner wall groove structure realizes efficient chip removal and extends maintenance-free cycle.

Significantly lower full-life cycle costs compared with metal bearing solutions.