Scale Seal (WR Type)

Specifications

How to choose Oil Seals

Points to check when selecting, with the values for this product (Scale Seal (WR Type)).

1. 1. Match shaft diameter and housing bore

   This product: Shaft diameter d 195～1595 mm

   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.

2. 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.

3. 3. Select lip material suited to fluid and temperature

   This product: Lip Material Nitrile rubber

   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.

4. 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.

5. 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.

6. 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.

About Oil Seals and all products

Description

Scale seal with a metal case. The number and layout of mounting holes vary by size, and some models have a drain. Material is nitrile rubber.

FAQ

Q. What shaft diameter range can the WR type scale seal be used for on large-diameter rotating shafts?

A. It is compatible with shaft diameters d of 195 to 1595 mm. It is used for sealing large-diameter rotating shafts.

Q. What is the lip material of the WR type scale seal?

A. The lip material is nitrile rubber. It is a scale seal with a metal case.

Q. Are WR type scale seals available with mounting holes or a drain?

A. They are available with equally spaced mounting holes and with a drain. The number and layout of mounting holes vary by size.

Written by AI based on the content of the source documents.

Source documents

• Catalog オイルシール ＆ Oリング
  Found on: https://koyo.jtekt.co.jp/support/catalog-download/