An RA overrunning clutch is a precision mechanical component designed to transmit torque in one direction while freewheeling or overriding in the opposite direction. It is widely used in industrial machinery, automotive systems, agricultural equipment, and power transmission applications to prevent backdriving, protect drives, and enable indexing or cycling operations. The RA series is known for its robust construction, high torque capacity, and reliable performance under demanding conditions, making it a preferred choice for engineers and maintenance professionals.
The following table provides detailed specifications for standard RA overrunning clutch models. These parameters are critical for selection based on application needs.
| Model Number | Bore Size (mm) | Outer Diameter (mm) | Torque Capacity (Nm) | Maximum RPM | Weight (kg) |
|---|---|---|---|---|---|
| RA-102 | 15 | 40 | 50 | 5000 | 0.5 |
| RA-205 | 20 | 50 | 100 | 4500 | 0.8 |
| RA-310 | 25 | 60 | 200 | 4000 | 1.2 |
| RA-420 | 30 | 70 | 350 | 3500 | 1.8 |
| RA-550 | 40 | 85 | 600 | 3000 | 2.5 |
RA overrunning clutches are versatile and used in various industries. Common applications include:
What is the primary function of an RA overrunning clutch?
The primary function is to transmit torque in one direction while allowing free rotation in the opposite direction, preventing backdriving and protecting mechanical systems.
How do I select the right RA overrunning clutch for my application?
Consider key parameters such as torque requirements, bore size, operating speed (RPM), environmental conditions (e.g., temperature and exposure to contaminants), and physical dimensions. Refer to the product specifications table and consult engineering guidelines for matching these factors to your system needs.
What maintenance is required for an RA overrunning clutch?
Most RA models are designed for low maintenance, with sealed bearings and pre-lubrication. However, periodic inspections for wear, lubrication replenishment in non-sealed units, and checking for misalignment or overload signs are recommended to ensure longevity.
Can the RA overrunning clutch handle high-speed applications?
Yes, depending on the model. Standard RA clutches support RPMs up to 5000, but it's essential to verify the maximum RPM specification for your chosen model and ensure it operates within safe limits to avoid premature failure.
What materials are used in manufacturing RA overrunning clutches?
They are typically made from hardened steel or alloy materials for high strength and durability. Surface treatments like zinc plating or nickel coating may be applied for corrosion resistance in harsh environments.
Is customization available for RA overrunning clutches?
Yes, many manufacturers offer customization options, including specific bore sizes, keyway profiles, special coatings, and torque ratings. Provide your application details to suppliers for tailored solutions.
How does an RA overrunning clutch differ from a standard clutch?
Unlike standard clutches that engage and disengage fully, an overrunning clutch allows continuous one-way torque transmission with automatic disengagement in the reverse direction, making it ideal for applications requiring freewheeling or override protection.
What are common failure modes for RA overrunning clutches?
Common failures include wear from overload, contamination leading to seizing, lubrication breakdown, and misalignment. Regular maintenance and proper installation can mitigate these issues.
