The Simmerring® Selector/Assistant tool only suggests a product selection based on the information provided by the customer and compares the entered data with the application parameters described in the catalog. The resulting product selection does not constitute a recommendation and does not replace specific advice regarding the intended use in individual cases.
Therefore, Freudenberg Sealing Technologies and Passerotti Sp. z o.o. assume no responsibility for the suitability of the product selection for the specific application intended by the customer.
We would like to point out that the sealing effect is not only ensured by the component itself, but also by various factors influencing the tribological system (e.g., temperature curves, pressure curve, shaft machining, tolerances, interaction with media/additives), which must also be taken into account. These and other factors influence the sealing performance of the product, which is why the seal in the application must be tested and approved by the user. Especially for critical applications, we recommend involving a sealing specialist.
d1Nominal diameter of the shaft to be sealed / dimensional tolerance h11 / roundness tolerance IT8
Surface machined in such a way that no distinct structure, in particular helical lines, is visible.
Hardened shaft – from 45 HRC to 63 HRC
Requirements for the roughness of the mating surface:
Rz = 1.0 μm to 5.0 μm
Ra = 0.2 μm to 0.8 μm
Rmax < 6.3 μm
Requirements for the roughness of the mating surface at a pressure > 1 bar:
Rz = 1.0 μm to 3.0 μm
Ra = 0.2 μm to 0.4 μm
Rmax < 6.3 μm
Shaft design (chamfer, etc.) in accordance with Freudenberg Sealing Technologies recommendations as specified in the technical manual.
d2Nominal diameter of the seat for the seal / dimensional tolerance H8
Surface roughness requirements for type BA (outer surface of the seal coated with elastomer):
Rz = 10 μm to 25 μm
Ra = 1.6 μm to 6.3 μm
Rmax < 25 μm
Roughness requirements for designs B1 and B2 (metal outer surface of the seal):
Rz = 6.3 μm to 16 μm
Ra = 0.8 μm to 3.2 μm
Rmax < 16 μm
Seal seat design (chamfer, etc.) in accordance with Freudenberg Sealing Technologies recommendations as specified in the technical manual.
b (mm)The height of the Simmerring® may vary depending on the available space in the housing. Space for a chamfer to facilitate installation must be taken into account. It is important to ensure that the elastomer-coated outer surface of the Simmerring® is pressed into the cylindrical part of the seat over its entire height. In the case of Simmerring® BABSL, it should be noted that the dust lip protrudes beyond the nominal height of the seal.
The Simmerring® sealing lip can be made of:
The choice of the appropriate material depends mainly on the operating temperature and the medium to be sealed:
The most important features of Simmerring® are specified in the type designation defined by Freudenberg Sealing Technologies:
Standard designs: BA, BASL, BAUM, BAUMSL, B1, B1SL, B2, B2SL, BABSL, MSS1, BAOF, B1OF, MSS7
Pressure designs: BABSL, PPS, B2PT (maximum pressure 10 bar, depending on other operating conditions)
The dust lip protects the sealing lip and the sealed system from dirt, dust, and moisture from the environment.
The rotational speed indicates how many times per minute the shaft rotates around its own axis (rpm). The maximum pressure and rotational speed values (which are interdependent) must not be exceeded. If these values are exceeded, premature wear will occur, excessive heat will be generated, the sealing lip will harden prematurely, and the service life of the seal will be shortened. As the rotational speed increases, the temperature at the sealing lip increases.
In the case of rotary seals, heat is generated on the sealing lip as a result of friction between the shaft and the sealing lip. The maximum temperature at which Simmerring® can be used is the temperature in the gap between the sealing lip and the shaft. If the temperature limit is exceeded, premature hardening of the sealing lip and a reduction in the service life of the seal must be expected. High temperatures on the sealing lip can cause thermal overload of the sealed medium (loss of tightness due to changes in the properties of the lubricant, carbon deposits on the shaft and seal, chemical reaction of the sealing lip with the thermally overloaded medium).
If mineral oil is used and good lubrication is ensured, knowledge of the medium temperature is sufficient to select the correct Simmerring®. Otherwise, the temperature at the sealing lip must be used for the calculation.
The medium temperature is the temperature in the oil pan. Due to friction, the temperature under the sealing lip is usually higher. The selector takes this excess temperature into account within certain limits. Since various factors influence this temperature, it is only an estimate. If the approximate temperature at the contact point of the sealing lip is known, it should be specified.
As the pressure increases, the contact pressure of the sealing lip against the shaft increases. As a result, the hydrodynamic conditions under the sealing edge are disturbed, friction and temperature increase. The limits of application of the seal are determined by the pressure and circumferential speed. The maximum pressure and rotational speed values (which are interdependent) must not be exceeded. If these values are exceeded, premature wear will occur, excessive heat will be generated, the sealing lip will harden prematurely, and the service life of the seal will be shortened.
The type of medium to be sealed determines the choice of material and thus also the design of the Simmerring®. The medium can be water, oil, or grease. Proper lubrication of the seal has a decisive influence on the service life and reliability of the seal. The sealed medium is not only a lubricant, but also a cooling fluid that dissipates the heat generated. The better the lubrication, the lower the probability of premature wear. If the medium to be sealed is mineral oil and the sealing lip is adequately lubricated, the temperature of the medium is sufficient to select the seal.
Contamination from the environment (e.g., dirt, dust, or moisture) may be absent, minor, or severe. This determines the selection of the appropriate Simmerring® type. Contamination from the sealed device may also need to be considered. If particles, e.g., from gear tooth abrasion, get under the sealing lip, they can lead to faster wear of the sealing lip and/or shaft. This applies in particular to devices with a vertical shaft. In this case, further consultation is necessary.
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