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Shaft diameter d1
Nominal diameter of the shaft which has to be sealed / tolerance h11 / concentricity IT8
Surface non orientated treated (e.g. non orientated at the plunge grinding with rotating workpiece)
Shaft preferably hardened 45 HRC up to 63 HRC
Requirments on the roughness of the counterface:
- Rz = 1,0 µm up to 5,0 µm
- Ra = 0,2 µm up to 0,8 µm
- Rmax < 6,3 µm
Requiremnts on the roughness ot the counterface at an operating pressure > 0,1 MPa:
- Rz = 1,0 µm up to 3,0 µm
- Ra = 0,2 µm up to 0,4 µm
- Rmax < 6,3 µm
Design of the shaft (assembly chamfer, etc.) according to Freudenberg’s technical manual recommendations.
Additional information: If you have leeway for the shaft diameter and do not necessarily have to rely on the information you have entered here, you can obtain further offers with similar dimensions via the Expert Mode.
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Case diameter d2
Nominal diameter of the shaft which has to be sealed / tolerance h11 / concentricity IT8
Surface non orientated treated (e.g. non orientated at the plunge grinding with rotating workpiece)
Shaft preferably hardened 45 HRC up to 63 HRC
Requirments on the roughness of the counterface:
- Rz = 1,0 µm up to 5,0 µm
- Ra = 0,2 µm up to 0,8 µm
- Rmax < 6,3 µm
Requiremnts on the roughness ot the counterface at an operating pressure > 0,1 MPa:
- Rz = 1,0 µm up to 3,0 µm
- Ra = 0,2 µm up to 0,4 µm
- Rmax < 6,3 µm
Design of the shaft (assembly chamfer, etc.) according to Freudenberg’s technical manual recommendations.
Additional information: If you have leeway for the shaft diameter and do not necessarily have to rely on the information you have entered here, you can obtain further offers with similar dimensions via the Expert Mode.
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Width b
Depending on the space in the housing, the axial width of the press fit of a Simmerring® can vary. The design of the assembly chamfer has to be considered. It has to be regarded, that the cylindrical outer diameter of a Simmerring® with elastomeric press fit has to be completely obstructed in the cylindrircal part of the bore. The BABSL design requires, that the dust lip has to overextend the width of the seat axially, which is given in the nomenclature.
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Material
The material of the elastomer parts of a Simmerring® can consist of fluor-caoutchouc (FKM), acrylic-nitrile-butadien-caoutchouc (NBR) or of polytetrafluoroethylene (PTFE) for the design B2PT.
The decision of an appropriate material depends on the temperature:
- FKM: -25 up to +160
- NBR: -40 up to +100 °C
- PTFE: -80 up to +200 °C
Furthermore the selection of a material is defined by the fluid to be sealed (see Freudenberg catalogue, respectively technicla manuals of Freudenberg).
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Design
The most important features of a Simmerring® are summarized in the nomenclature defined by Freudenberg:
- BA… = elastomeric outer press fit
- B1… = metallic outer press fit with one metal sheet
- B2… = metallic outer press fit with two metal sheets
- (BA)U…, (BA)UM…, (BA)..., (B1)..., (B2)... = sealing lip profile up to a preassure load of max. 0,5 bar (depending on further operation conditions)
- (BA)FU..., (B1)FU..., (B2)FU..., ... = sealing lip profile up to a preassure load of max. 0,2 bar (depending in further operation conditions)
- BAB... = preassure seal (max. preassure load depending on further operation conditions)
- ...SL = dust lip (max. circumferential speed 8 m/s - separate max. rotational speed for the design BAB...SL has to be regarded)
- ...OF = without spring (only to be used as additional seal against outer dirt impact)
Standard design: BA, BASL, BAUM, BAUMSL, B1, B1SL, B2, B2SL, BABSL, MSS1, BAOF, B1OF, MSS7
Preassure Designs: BABSL, PPS, B2PT (max. pressure load 10 bar depending on further operation conditions)
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Dirt contamination
The design of the Simmerring® is dependent on the amount of contamination it will experience in-use; such as external contamination on the air side of the seal, (i.e. dirt, dust, or moisture), and internal contamination on the fluid side, (i.e. metal particulate from within a gear-box). These conditions can cause an intensified wear of the sealing edge and of the shaft, (this applies especially to sealing applications with vertically orientated shafts). Should this be the case in your application, an additional consultation would be necessary
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Rotational Speed
The rotational speed is indicating how often the shaft is turning around itself per minute (rpm). The maximum pressure-rpm load must not be exceeded. Expect premature wear and hardening of the sealing edge and a shortened life-cycle if the combined limits are exceeded. Sealing edge temperature increases with rotational speed.
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Temperature
Rotational sealing heat occurs due to the friction between the relative movement of the shaft and the sealing edge. The temperature in the sealing gap between sealing edge and shaft represents the maximum temperature on which the Simmerring® can be used. Expect premature wear and hardening of the sealing edge and a shortened life-cycle if the combined limits are exceeded. High temperatures in the sealing gap can lead to a thermal overload of the fluid to be sealed, (i.e. interference of the sealing function through changes of the lubricant properties, deposits on the shaft and on the seal, and chemical attack of the sealing edge as a result of the thermally destroyed fluid). The temperature of the fluid is sufficient for the selection of a Simmerring®, if it is a mineral oil and a good lubricant supply is available. If this isn't the case, the more relevant contact temperature directly on the sealing edge should be used to calculate temperature with the link shown.
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Temperature definition
The fluid temperature, is the temperature in the oil sump. The temperature under the sealing lip is usually higher due to friction. The selector considers this overheat within certain limits. Due to different influencing factors (medium, lubrication, etc.) this can only be an estimation.
If the contact temperature (below the sealing lip) is known approximately, this should be stated. For further calculation, the InsECT Tool of the University of Stuttgart ( https://insect.ima.uni-stuttgart.de/) can be used.
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Pressure
With increasing pressure the compression of the sealing lip on the shaft surface is increasing, thereby the interference of the hydro-dynamics below the sealing edge, the friction and overheating at the sealing edge. The pressure load and the circumferential speed defines the operation limits of the seal. The maximum pressure-rpm load ability of a Simmerring® must not be exeeded. Expect additional heat development (see temperature), premature wear and hardening of the sealing edge, and a shortened life-cycle if the combined limits are exceeded. Sealing edge temperature increases with pressure.
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Lubricant
The selection of a material is essentially defined by the fluid to be sealed and therefore also the design of the Simmerring®. The kind of fluid can be watery, oily or greasy. The sufficient supply of the seal with lubricant is crucial for the durability and reliability of the seal. The fluid to be sealed not only serves as a lubricant, but it also is required to lead emerging frictional heat away from the seal. The more intensive the lubrication, the less likely is excessive wear to be expected. The temperature of the fluid is sufficient for the selection of a Simmerring®, if it is a mineral oil and a good lubricant supply is available. If this isn't the case, the more relevant contact temperature directly on the sealing edge should be used to calculate temperature with the link shown.
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Dirt contamination
The design of the Simmerring® is dependent on the amount of contamination it will experience in-use; such as external contamination on the air side of the seal, (i.e. dirt, dust, or moisture), and internal contamination on the fluid side, (i.e. metal particulate from within a gear-box). These conditions can cause an intensified wear of the sealing edge and of the shaft, (this applies especially to sealing applications with vertically orientated shafts). Should this be the case in your application, an additional consultation would be necessary
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