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FAG
Four Point Contact B. FAG QJ224 -N2-MPA
- Technical data
- Inner diameter
- 120 mm
- Outer diameter
- 215 mm
- Width
- 40 mm
- Seal
- None, open bearing
- Cage
- Brass cage
- Clearance
- Normal radial clearance
- Running accuracy
- Tolerance class P0/PN2 / ABEC 1
- Groove(s) on outer ring
- 2 retaining grooves on outer ring shifted by 180 degrees
- Design
- Split inner ring
- Temperature range
- -30 to +150 °C
- Weight
- 6,82 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 2 | 33,50 € | 636,55 € |
| 3 | 67,00 € | 603,05 € |
Four Point Contact B. FAG QJ224 -N2-MPA
The FAG QJ224 -N2-MPA four-point bearing, measuring 120 x 215 x 40 mm, accommodates high axial forces in both directions whilst saving space.
The FAG QJ224 -N2-MPA four-point contact bearing is a rolling bearing with a 120 mm bore, an outer diameter of 215 mm and a width of 40 mm. This design is based on a split inner ring and, thanks to the four-point contact, accommodates axial forces in both directions whilst requiring less axial installation space than two separate individual bearings. As an open bearing with standard radial clearance and a brass cage, this version is suitable for a temperature range of -30 to +150 degrees. Designs benefit from precise shaft guidance combined with a compact design.
In which installation scenarios does the QJ224 -N2-MPA four-point bearing absorb axial forces?
The QJ224 -N2-MPA four-point bearing is primarily installed where varying axial loads need to be accommodated within limited axial installation space. This design is frequently combined with a separate radial bearing as a pure axial bearing, with the outer ring mounted radially free within the housing. Typical applications are found where defined axial guiding forces are required in both directions. As four-point bearings are hardly capable of compensating for misalignment, the bearing mounting requires a rigid, dimensionally accurate connecting structure as well as precise alignment of the shafts.
What are the advantages of the split inner ring and the retaining grooves?
The design with a split inner ring allows for the accommodation of a large number of balls, which specifically increases the axial load-carrying capacity. Furthermore, during assembly, the bearing rings can be positioned separately on the shaft and in the housing. The suffix -N2 denotes two retaining grooves in the outer ring, offset by 180 degrees, which prevent the ring from rotating within the housing by means of corresponding retaining pins. Together with the robust brass cage (MPA) and tolerance class P0/PN, the bearing is suitable for demanding continuous-duty applications under stable operating conditions.
What makes the QJ224 -N2-MPA four-point bearing stand out?
A single-row roller bearing with an inner diameter of 120 mm, an outer diameter of 215 mm and a width of 40 mm, featuring a split inner ring. Thanks to the special raceway geometry, the design can accommodate axial forces in both directions. This version features a robust brass cage, standard bearing clearance and is designed for operating temperatures between -30 and +150 degrees.
What is the purpose of the two retaining grooves on the outer ring?
The designation -N2 refers to two retaining grooves, offset by 180 degrees, on one end face of the outer ring. These recesses are used to secure the outer ring in the housing by means of a positive fit, using suitable retaining pins or keyways. This prevents the outer ring from rotating unintentionally under varying loads or when installed with radial clearance.
Why is the inner ring of this bearing split?
The two-piece inner ring allows a maximum number of rolling elements to be fitted between the raceways, which increases the load-carrying capacity for axial forces. Furthermore, the design simplifies the separate installation of the outer ring, ball cage and inner ring halves onto the 120 mm shaft, as the components are not interconnected in a self-retaining manner.
What type of lubrication does the open four-point bearing require?
As this is an open bearing without integrated sealing washers, the component requires an external supply of lubricant – either oil or grease – within the housing assembly. At the same time, a customer-supplied seal protects the bearing against the ingress of dirt and moisture and enables operation within the specified temperature range of -30 to +150 degrees.
Within what tolerances is the bearing manufactured?
This model complies with tolerance class P0 or PN as per the standard (comparable to ABEC 1) and thus meets the usual industrial requirements for dimensional and running accuracy. The standard radial bearing clearance helps to ensure that the bearing play remains within the specified operating parameters for standard fit selections and operating temperatures.
What does the suffix ‘MPA’ stand for in FAG?
The abbreviation MPA refers to a solid window cage made of brass. Brass cages offer high mechanical strength and are well suited to applications involving vibration, as well as to thermally demanding environments.
Schaeffler Technologies AG & Co. KG
Industriestraße 1-3, 91074 Herzogenaurach, Germany
info.de@schaeffler.com, https://www.schaeffler.de/de/meta/impressum/
10005454