Reverse Bearing Device
When installing a reverse bearing device, it is essential to start by opening the reverse support package and checking the certificate and identification labels. Ensure that the type of reverse support being used matches the required specifications.
The surface of the equipment should be clean and bright. Remove any residual materials such as paint, weld spatter, burrs, or other foreign substances. During this process, avoid letting solvents enter the internal parts of the reverse bearing. Use only solvents that do not damage the sealing components. The surface should be dry and free from any lubricants or smoothing agents. Protective measures must also be taken to ensure the safety of workers and the environment.
The surface roughness of the support area should not exceed Ra=12.5 μm or Ra=6.3 μm, depending on the application. The flatness of the surface must be corrected for both circumferential and radial errors. The circumferential flatness tolerance should follow the raceway of the reverse support. For larger diameters, there are specific standard values available (refer to detailed specifications). The radial error is measured based on the flange width, and the radial plane tolerance is half of the circumferential tolerance value.
To prevent uneven surfaces or deformation of the support, the circumferential flatness error should be corrected in one pass within any 180-degree section, ensuring a smooth transition without abrupt changes.
B. Stiffness Requirements for Bearings
Reverse bearings and zero-clearance reversing bearings have different rigidity requirements. The following table provides the allowable deformation amounts for standard and zero-clearance supports:
| Raceway Diameter (mm) | Allowable Deformation (mm) - Ball Type | Allowable Deformation (mm) - Roller Type | Zero-Clearance Allowable Deformation (mm) - Ball Type | Zero-Clearance Allowable Deformation (mm) - Roller Type |
|---|---|---|---|---|
| 250 | 0.31 | 0.24 | 0.22 | 0.16 |
| 500 | 0.40 | 0.30 | 0.28 | 0.21 |
| 750 | 0.53 | 0.36 | 0.35 | 0.24 |
| 1000 | 0.60 | 0.41 | 0.40 | 0.28 |
| 1500 | 0.80 | 0.53 | 0.50 | 0.35 |
| 2000 | 1.0 | 0.60 | 0.68 | 0.40 |
| 2500 | 1.2 | 0.68 | 0.80 | 0.45 |
| 3500 | 1.5 | 0.90 | 1.08 | 0.62 |
C. Positioning of Reverse Bearings
The inner and outer ring raceways of the positioning reverse bearing may have a soft band. This should be positioned on both sides of the main load plane, meaning it should be offset by 90 degrees from the main load zone. A blockage or an “S†symbol may be present at the soft band location.
Additionally, check the compatibility between the reverse bearing and the equipment surface. Use a feeler gauge for accuracy, and if necessary, fill in any gaps with appropriate material. Avoid welding on the support during installation.
D. Bolt Tightening and Fastening
1. Select regular bolts and washers according to specifications (size, quantity, strength grade, etc.). Do not use full-threaded bolts or old bolts, nuts, or washers. Avoid using open washers like spring washers.
2. Choose the correct pre-tightening torque for the bolts. For general metric bolts, the pre-tightening force should be 0.6–0.7 times the yield strength. It is recommended to use hydraulic fastening equipment for bolts larger than M27, with the pre-tightening force not exceeding 85% of the flexural strength.
3. Fasten the bolts under no-load conditions. Apply a small amount of oil to the threads to ensure even friction resistance. Avoid using thread-locking glue.
Pre-tightening steps should be done in three stages: 30%, 80%, and 100% of the final torque.
E. Adjusting Gear Backlash
Correctly adjusting the gear backlash is crucial when setting up the gear backlash device. This can be done using a feeler gauge at the highest point of the gear’s radial runout, or by using lead wire or another suitable method. If the gap is not within the acceptable range, adjust the pinion spacing accordingly.
After adjustment, rotate the reverse bearing at least one full revolution to ensure there are no other tooth jump points. Recheck the backlash after the reverse bearing is fixed. The highest point of radial runout should be located in the tooth groove marked with green paint.
F. Lubrication and Surface Preparation
Before initial use, ensure the raceway is smooth and well-lubricated. Apply the recommended grease as specified in the drawing or product manual. Pay special attention to all grease fittings and apply grease one by one. The best side to apply the grease is on the side facing the reverse bearing until the grease is squeezed out of the seal ring.
When lubricating the gear, ensure the tooth surface is clean. It is recommended to use a clean brush to apply the grease evenly on the gear teeth.
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