SKF 22318 EJA/VA405 is a spherical roller bearing specifically designed for vibratory applications (such as mining, construction, and heavy machinery). This bearing is capable of withstanding high loads, misalignment, and harsh conditions. Its detailed specifications are given below:
Features and Technical Specifications:
1. Dimensions:
2. Load rating:
3. Speed
4. Clearance:
- This bearing comes with C4 radial internal clearance, which provides greater clearance than normal. It is suitable for vibratory applications and high temperatures.
- Clearance after fitting:
- Due to tight fit (interference fit) the clearance may be reduced by 0.010-0.030 mm, depending on the fitting of shaft and housing.
- Use a micrometer or feeler gauge to measure the exact clearance and follow SKF guidelines.
5. Design features:
- Cylindrical bore: Cylindrical bore design instead of tapered bore (K).
- EJA/VA405:
- EJA: Two surface-hardened stamped steel cages and guide rings centered on the outer ring raceway.
- VA405: Special design for vibratory applications, with the ability to withstand high vibration and shock loads.
- Lubrication: Lubrication groove in outer ring and three lubrication holes (b: 11.1 mm, K: 6 mm).
- Material: Standard bearing steel, FKM seals, and steel cage.
6. Misalignment Capacity:
- Being a spherical roller bearing it can accommodate misalignment between the shaft and housing without increasing friction and temperature.
- Temperature Range:
Bearing clearance after fitting: 22318 EJA/VA405
- Due to the C4 clearance, the radial clearance before fitting is normally 0.090-0.120 mm (according to SKF datasheet).
- After a tight fit (interference fit in shaft or housing) the clearance may be reduced to 0.010-0.030 mm. For example:
- It is common to use a k5 or m5 fit on the shaft and an H7 or G7 fit in the housing.
- Use a feeler gauge or dial indicator to measure the clearance after fitting.
- Hot mounting: To fit the SKF 22318 EJA/VA405 into the housing, heat the housing to 80-90°C, then push the bearing in. Fill in the appropriate amount of grease after mounting.
Applications:
- Mining and construction machinery (such as vibrating screens, crushers)
- Electric power industry
- Steel industry
- Heavy-duty machinery where high vibration and load occur.
Important Tips:
- Lubrication: Use high-quality grease (e.g. SKF LGHB 2) and relubricate at regular intervals.
- Fitting: Comply with shaft and housing tolerances (e.g. ISO k5/m5 shaft and H7 housing). Incorrect fitting can result in too little or too much clearance.
- Installation: Use an induction heater for hot mounting and hold the bearing until it cools down.
Clearance adjustment:
- If the clearance is too small, the bearing may overheat or jam. Too much clearance may cause increased vibration.
- Measuring procedure:
- Fit the bearing onto the housing and shaft.
- Measure the radial clearance with a feeler gauge.
- If the clearance is less than 0.010 mm or more than 0.030 mm, adjust the fitting tolerance.
Availability and price:
- This is a premium bearing from SKF, which can cost $350-$750 (approx. ₹29,000-₹62,000), depending on the dealer and order quantity.
- Availability: Available at SKF authorized dealers, online platforms (like Amazon, eBay, or RS Components).
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