Keyless shaft-to-hub assemblies are state-of-the-art designs used to maximize torque transmission by relying entirely on the precision fit and the retaining compound. These assemblies are subjected to maximum torsional and shear forces, high-frequency vibration, and significant shock loads in critical drive systems. Any micromovement in this joint results in fretting corrosion, loss of torque transfer, and catastrophic mechanical failure. This requires the highest level of structural integrity: a non-negotiable High Strength, Permanent bond.
The optimal solution is a high-strength retaining compound engineered to create a unified, keyless, zero-backlash joint.
INCURE WeldLock™ 347 Retaining Compound (Green)
The INCURE WeldLock™ 347 Retaining Compound is the definitive choice for securing keyless shaft-to-hub assemblies. It is a high-strength solution specifically designed for dynamic loads and superior thermal stability in power transmission components.
| Key Feature | Performance for Keyless Shaft-to-Hub Assemblies |
| High Strength, Fast Curing | Creates a monolithic, keyless connection that resists the absolute maximum torsional forces and shear stress, ensuring 100% power transmission without slippage. |
| Temperature Resistance (175∘C) | Maintains full structural integrity under sustained operational heat, crucial for reliable, continuous-duty industrial drives. |
| Ideal Gap Fill (Up to 0.15mm) | Perfect for securing standard, close-tolerance press-fit assemblies, eliminating the microscopic clearances that cause fretting corrosion. |
| Core Application | Specifically suited for securing gears, rotors, and shafts in mechanical drives, fulfilling the demanding requirement of keyless power coupling. |
Application Steps: Installing Keyless Shaft-to-Hub Assemblies
For maximum torque transfer and reliable structural retention of keyless assemblies, follow these steps:
1. Surface Preparation (The Foundation)
- Clean: Thoroughly clean both the shaft surface and the hub bore. Surfaces must be absolutely free of all contaminants, especially oil or grease. Use an industrial cleaner or solvent (e.g., acetone) and wipe dry.
- Activate (If Needed): If using passive metals (like stainless steel) or if the ambient temperature is below 15∘C(59∘F), apply a chemical activator to the bond surfaces and allow it to flash off completely.
2. Product Application
- Apply: Apply a continuous, thin bead of WeldLock™ 347 around the full circumference of either the shaft or the internal bore of the hub.
- Ensure Coverage: Ensure the adhesive completely wets the entire mating surface as the components slide together to fill all microscopic gaps.
3. Assembly and Curing
- Assemble: Immediately slide or press the hub onto the shaft, using care to maintain alignment. Due to the high-strength nature, ensure the hub is correctly positioned before the compound fixtures.
- Wipe Excess: Remove any excess adhesive visible outside the joint immediately after assembly.
- Cure: Allow the assembly to fixture before handling (typically 5 minutes). Allow a full 24 hours for the compound to reach maximum strength before subjecting the assembly to operational loads.