- Bearing clearance classes C2, CN, C3 and C4
- | Fa - axial load
- | Fr - radial load
- | P - dynamic equivalent load
- | PN/P0 tolerance class for radial bearings (without tapered roller bearings)
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Spherical roller bearings can compensate for angular errors.
|Series||Adjustment angle where |
P<0.1 * Cr
|213, 222, 230, 239, 240, 241||1.5°|
|223, 231, 232, 233||2°|
These specifications apply to
- static angular errors
- circumferential inner ring
The bearing clearance of a bearing is identified by means of its C mark (C0, C2, C3 ...).
C0/CN: standard bearing clearance class. This mark is usually omitted.
C2: decreases bearing clearance
C3: higher bearing clearance than C0/CN
C4: higher bearing clearance than C3 - in particular for vibration machines and vibrating screen bearings
C5: higher bearing clearance than C4, used in particular in high-temperature bearings.
Conical spherical roller bearing are fastened to the shaft using an adapter sleeve or withdrawal sleeve. The tightening torque must be observed in such a way that the bearing clearance is not impermissibly restricted. The ease of movement of the bearings is to be checked after installation.
There are various possibilities for controlled installation by means of hydraulic nuts in conjunction with the measurement of the displacement path that ensure the secure installation of spherical roller bearings, even with C0/CN bearing clearance. More detailed consulting is possible through our Application Engineering team.
The C3 design is recommended for installation with an adapter sleeve because the increased bearing clearance makes a stronger tightening torque possible.
Abutment dimensions and radial runout accuracy have a decisive impact on the service life and function of rolling bearings. The selection of the shaft, housing and bearing tolerance should therefore always be checked in advance.
The following tolerance classes are available:
- Standard tolerances available ex stock: P0/PN
Cage types may vary depending on the size and application type. We carry various cage designs made of steel sheet, brass, and plastic.
Bearings without any special markings have a steel sheet cage.
|Brass sheet||M, MB, MA|
|Glass fiber reinforced plastic||TVPB, KU||Glass fiber content 25%, (standard)|
Spherical roller bearings (without a seal) are delivered with a preservative oil. The lubricant must be selected separately based on the specific application.
A lubricant selection that is precisely tailored to the application conditions contributes disproportionately to the service life both in a positive and in a negative sense. For this reason, the technical and economical optimization of lubricant is an important contribution made by our application consulting.
An essential property of greases and oils is the reliable mechanical separation of the rolling element from the raceway. Depending on the application, you need special types of grease to achieve this function. The following properties in particular affect the function:
- the starting and operating temperature
- the speed of the bearing
- the external ambient conditions (moisture, contamination, vapors/gases...)
Our application engineer would be happy to analyze your application conditions and recommend suitable lubricants.
We use the following lubricant manufacturers as standard suppliers:
- Kyodo Yushi
- Klüber Lubrication
We would be happy to make you a concrete offer for special processing, including the use of greases, oils or preserving agents that you specifically request.
Outer and inner rings are manufactured from 100Cr6 (German standard), SUJ2 (Japanese standard) or GCr15 (Chinese standard) as standard.
Steel sheet cages are manufactured from DC01A/ST12 as standard.
Plastic cages (suffix TN, TV, TVP...) may have different specifications but are usually made of polyamide. High-temperature designs made of PEEK.
Seals are manufactured from NBR (acrylonitrile butadiene rubber) as standard. This results in an operating temperature of -30 °C to +100 °C, even if the grease permits a higher temperature.
Inadequate sealing can allow external environmental conditions to have an extremely negatively impact on running characteristics and thus a bearing’s service life. For this reason, bearings must be protected by seals.
Bearings with seals on both sides are generally lubricated for life.
At the same time, seals also prevent lubricants from leaking.
Sheet metal lid with a split seal effect. Only protects against coarse contamination. Only prevents grease from escaping to a limited extent, particular care is required when the grease becomes viscous, i.e. more liquid, because the risk of grease leaks increases. In such cases, a different viscosity class should be chosen for the grease, or a contact/non-contact seal should be used instead.
A contact seal with effective sealing that protects against coarse and fine contamination. Also has very effective sealing that protects against lubricant leaks and therefore a long service life. By default, the seal consists of nitrile rubber and has a temperature resistance of -40 °C to +100 °C.
Note: These seals have different designs depending on the manufacturer. See also LLU, VV, DD as special designs of a 2RS seal.
Non-contact seal, usually inserted into a groove. Speed limits correspond to those of ZZ bearings. Very good seal, low internal heating due to friction of the seal, which also makes it very energy efficient. Popularly used in rotary encoders. Effective sealing, even against grease leaks.
Abutting seal, double-lipped design. One lip rests axially against the inner rib of the groove, and the second can be a contact or non-contact seal for protection against penetrating foreign bodies that is oriented outward. The excellent seal also ensures reliable protection against aggressive paper dust and fine dirt particles.
Findling Wälzlager has already produced more than 1,500 drawing parts for its customers. We will find you an economically and technically optimal solution for your application from the combination of ABEG® performance class and designs. You can trust 100 years of experience in rolling bearing technology.