Large-Diameter Seal (MS)
MS / JTEKT Corporation (Official website) / Listed on page 6 of the document
Large-diameter oil seal for converter trunnion bearings. Available in a one-point cut configuration that allows installation without removing the shaft.
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How to choose Oil Seals
Points to check when selecting, with the values for this product (Large-Diameter Seal (MS)).
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1. Match shaft diameter and housing bore
Select shaft diameter d and outer diameter D by nominal dimensions to suit the mating shaft and housing bore. Listed shaft diameters range widely from 6 to 3530 mm. Some standard types are designed assuming shaft tolerance h8 and housing bore tolerance H7/H8. Deviation from fit tolerances can cause leakage or seal dislodgement.
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2. Check width fits the installation space
Confirm that width b fits within the axial installation space. Listed products are 5 to 30 mm. For large types, cross-section width, groove width, and presence of spacers are also part of the dimensional requirements, so verify against the housing groove dimensions.
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3. Select lip material suited to fluid and temperature
Lip material governs oil resistance and heat resistance. Nitrile rubber is a general-purpose material for mineral oils, acrylic and fluororubber suit the high-temperature range, and silicone readily covers low to high temperatures. PTFE lips are suitable for chemicals and high temperatures, and food-hygiene-compliant materials are available for food machinery.
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4. Allow margin in operating temperature range
Confirm that the continuous operating temperature range includes the running oil temperature. Temporary temperature rises, such as at startup, are judged by the short-term maximum temperature (120 °C in one listed example). However, if the normal operating temperature is close to the upper limit, rubber hardening and lip wear will accelerate.
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5. Verify shaft surface speed is within limit
Surface speed is the lip sliding speed calculated from shaft diameter and rotational speed. The listed maximum surface speeds are 5 to 20 m/s, and exceeding them causes lip deterioration from frictional heat. Even at the same rotational speed, surface speed increases with larger shaft diameter, so check this particularly for large-diameter shafts.
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6. Confirm maximum sealing pressure limit
Standard oil seals are intended for low-pressure use. Listed maximum operating pressures vary greatly by type, from 0.03 to 15 MPa, so select a pressure-resistant type for applications with internal pressure. Under pressure the lip is pressed strongly against the shaft, making heat generation more likely.
This guide was written by AI based on the listed products' documents and specification items.
Description
Multi-lip structure prevents dust ingress. A seal configuration with one cut point can be selected for easy installation even when the shaft is not removed.
Features
- Available in one-point cut configuration
- Multi-lip structure prevents dust ingress
Applications
- Split trunnion bearings for converters
FAQ
- Q. Can the Large-Diameter Seal (MS) be installed without removing the shaft?
- A. A seal configuration with one cut point can be selected for easy installation even when the shaft is not removed.
- Q. What applications is the Large-Diameter Seal (MS) used for?
- A. It is used in split trunnion bearings for converters. It is a large-diameter oil seal for converter trunnion bearings.
- Q. Can the Large-Diameter Seal (MS) prevent dust ingress?
- A. The multi-lip structure prevents dust ingress.
Written by AI based on the content of the source documents.
Source documents
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