In the demanding world of power transmission and heavy machinery, the integrity of the connection between a shaft and a rotating component is paramount. For decades, the industry has relied on keyways and set screws, solutions that often lead to wallowing, fretting corrosion, and eventual failure under high torque and cyclic loads. A superior alternative exists: the Taper Bore Bolt-On Hub. This engineering marvel provides a true, friction-grip connection that maximizes power transfer, minimizes maintenance, and extends equipment life. At Raydafon Group, we have refined this technology to its peak, offering a range of precision-engineered hubs designed for reliability and performance.
Unlike traditional hubs, a Taper Bore Bolt-On Hub features a precision-machined conical bore that mates perfectly with a correspondingly tapered shaft or adapter. This design, when secured by high-strength cap screws, creates immense radial clamping force, ensuring a 360-degree, zero-backlash connection. The result is a system that eliminates the stress concentrations inherent in keyways, effectively handling high torque, reversing loads, and shock loads with unwavering stability.
Our Taper Bore Bolt-On Hubs are manufactured from the highest quality materials to exacting tolerances. Below are the detailed specifications for our standard series. Custom configurations are available upon request to meet unique application challenges.
The following table outlines our most popular standard hub sizes. All dimensions are in millimeters (mm).
| Model Code | Nominal Bore (mm) | Outside Diameter (mm) | Hub Width (mm) | Bolt Circle Diameter (mm) | Number of Bolts | Bolt Size | Max. Recommended Torque (Nm)* |
|---|---|---|---|---|---|---|---|
| RF-TBBH-25 | 25 | 80 | 50 | 60 | 4 | M8 | 480 |
| RF-TBBH-40 | 40 | 120 | 70 | 90 | 6 | M10 | 1,650 |
| RF-TBBH-50 | 50 | 140 | 80 | 110 | 6 | M12 | 3,200 |
| RF-TBBH-65 | 65 | 180 | 100 | 145 | 8 | M12 | 6,500 |
| RF-TBBH-80 | 80 | 220 | 120 | 180 | 8 | M16 | 11,000 |
| RF-TBBH-100 | 100 | 260 | 140 | 220 | 10 | M16 | 18,000 |
*Max. Torque values are based on a coefficient of friction of 0.12 and proper installation with recommended bolt torque. Actual performance may vary based on surface conditions and application.
Proper installation is critical to achieving the full performance of a Taper Bore Bolt-On Hub. Follow these steps to ensure a perfect fit.
Q: How does a Taper Bore Bolt-On Hub actually grip the shaft without a key?
A: The gripping action is purely frictional. The tapered bore, when drawn onto the matching male taper by the tightening bolts, creates tremendous radial clamping force. This force creates a mechanical bond so strong that torque is transmitted through friction alone, eliminating the need for a key. The connection is analogous to a precision Morse taper in tooling.
Q: Can I use a Taper Bore Hub on a standard straight shaft?
A: Yes, but it requires an intermediary component. A matching tapered adapter sleeve must be used. The sleeve has a tapered outside diameter to fit the hub and a straight bore (often with a keyway) to fit the standard shaft. This combines the benefits of the keyless taper lock connection with the convenience of a standard shaft.
Q: What is the main advantage over a traditional keyed hub with set screws?
A: The key advantage is the elimination of stress concentrations. A keyway creates notches in both the shaft and hub, which are prime locations for crack initiation under cyclic loads. Set screws point-load the shaft, causing dimpling and fretting. The Raydafon Group Taper Bore Hub applies uniform, 360-degree clamping pressure, distributing stress evenly and dramatically improving fatigue life.
Q: How do I determine the correct bolt torque for my hub?
A> The correct bolt torque is critical and is specified in the technical documentation provided with every Raydafon Group hub. It is calculated based on bolt grade, size, number of bolts, and the desired clamping force. Never guess or use generic torque charts. Under-torquing can lead to slippage; over-torquing can overstress the hub flange or bolts.
Q: Are these hubs suitable for high-speed applications?
A: Absolutely. Due to their inherently balanced design (no keyway imbalance) and secure fit, they are excellent for high-speed operation. For very high rotational speeds, we recommend a dynamic balance check of the entire assembly after installation. Raydafon Group can also provide hubs that are pre-balanced to specific standards upon request.
Q: What maintenance do they require?
A> Maintenance is minimal. The primary task is periodic verification of bolt torque, especially after the first few hours of operation and during routine maintenance shutdowns. It is also good practice to inspect for any signs of corrosion or contamination at the interface.
Q: Can a Raydafon Group Taper Bore Hub be used in reversing drive applications?
A: Yes, they are exceptionally well-suited for reversing drives. The zero-backlash characteristic prevents the "hammering" effect seen in worn keyway connections when direction changes, protecting gears, couplings, and other downstream components.
Q: Does Raydafon Group offer custom hub configurations?
A: Yes, engineering custom solutions is a cornerstone of our service. We can manufacture hubs with special bore tapers, larger flanges, unique bolt patterns, integrated sprockets or pulleys, and from specialized materials like stainless steel or ductile iron to meet specific environmental or load requirements.
The versatility and reliability of Raydafon Group Taper Bore Bolt-On Hubs make them the ideal choice for a vast array of industries and applications where connection integrity cannot be compromised.
Raydafon