BS30-BS450HS Holdback Backstop Bearing Clutch
Feature
BS&BS-HS SERIES CAM CLUTCH
Instant Locking Backstop Bearing
Self-locking wedge mechanism ensures immediate engagement to prevent reverse rotation, protecting equipment from backdrive damage.
Heavy-Duty Sealed Construction
Triple-lip sealing (IP66) and hardened alloy steel components provide superior contamination resistance and extended service life.
Maintenance-Free Operation
Pre-lubricated and sealed for life, reducing downtime and operational costs.
High-Torque Capacity
Designed for demanding applications (e.g., conveyors, wind turbines) with torque ratings up to 10,000 Nm.
Wide Temperature Tolerance
Operates reliably in extreme conditions (-30°C to 120°C) without performance loss.
Easy Integration & Customization
Standard dimensions simplify replacement, while OEM/ODM options (bore size, coatings) are available.
For Reverse Rotation Prevention on Conveyors The BS series Cam Clutches are intended for applications where reverse rotation of the slow speed
conveyor head shaft is to be prevented (backstopping).
Typical Applications for BS Series Backstop Clutch
The BS series is designed to prevent reverse rotation (backspin) on the slow-speed shaft of industrial equipment. Common uses include:
Inclined Belt Conveyors : Prevents loaded belt from running backward during emergency stop or power failure.
Bucket Elevators : Stops reverse drop of filled buckets, avoiding material spillage and belt damage.
Wind Turbine Gearboxes : Holdback function to prevent reverse rotation during maintenance or high wind conditions.
Paddle Mixers & Agitators: Prevents reverse rotation that could damage mixing blades.
Stackers & Reclaimers: Provides safety backstop on inclined boom conveyors.
How to Select the Right BS Series Model?
BS30 – BS80: For small to medium conveyors (torque up to ~2,000 Nm). Shaft diameter up to 80mm.
BS100 – BS250HS: For standard industrial conveyors and elevators (torque up to ~6,000 Nm).
BS300HS – BS450HS: For heavy-duty mining, quarry, and high-torque applications (up to 10,000 Nm).
Note: HS series offers higher torque capacity in the same envelope size. For exact sizing, please provide your shaft diameter, torque requirement, and mounting configuration.
Product display
FAQs: BS Series Backstop Clutch
Q1: What is the difference between a backstop clutch and a standard one-way bearing?
A: A backstop clutch (like BS series) is specifically designed to prevent reverse rotation under high torque on a stationary or slow-moving shaft. It engages instantly with zero backlash. Standard one-way bearings are often for overrunning or indexing at higher speeds, not heavy backstop duty.
Q2: Can the BS series replace a Formsprag or Marland backstop?
A: Yes. BS series dimensions and torque ratings are designed to be interchangeable with common industry standards. For example, BS80 often replaces Formsprag FSB-8. Send us your existing part number for cross-reference and a drawing verification.
Q3: Is the BS series truly maintenance-free?
A: Yes, under normal operating conditions (clean environment, temperature within -30°C to 120°C, no water ingress). The pre-greased, triple-sealed design eliminates routine lubrication. However, if operated in highly abrasive or wet conditions, periodic seal inspection is recommended.
Q4: What should I do if the backstop clutch is not holding (slipping)?
A: Potential causes: (1) Mounted in wrong rotation direction – check arrow. (2) Shaft or housing tolerance too loose – ensure h7/H7 fit. (3) EP-additive grease used – flush and relubricate with recommended oil/grease. (4) Wedge springs damaged – replace clutch. Contact technical support for diagnosis.
Q5: Do you offer the BS450HS with a custom bore size?
A: Yes. Suma provides OEM/ODM customization for bore size, keyway, mounting flanges, and corrosion-resistant coatings (black oxide, zinc phosphate). Minimum order quantity may apply. Please provide your shaft drawing.
Q6: What is the maximum overrunning speed for the BS series?
A: The BS series is designed for low-speed backstopping (typically shaft speed<100 rpm). For overrunning or freewheeling at higher speeds, please consider our DC series (up to 8600 rpm) or MG series (sealed, bearing-supported).
