2TR… Internal Gear Type Slewing Ring Bearing for Tunnel Boring Machines

Specifications

How to choose Slewing Ring Bearings

Points to check when selecting, with the values for this product (2TR… Internal Gear Type Slewing Ring Bearing for Tunnel Boring Machines).

1. 1. Select a structure that suits load and moment

   Single-row ball type is compact and suited to general construction machinery and cranes; three-row combined cylindrical roller type offers high rigidity and rated load for large cranes and tunnel boring machines; double-row tapered roller type can carry high axial load thanks to its large contact angle. Select the type based on the magnitude of moment load and impact.

2. 2. Allow margin in static rated load

   Because slewing bearings often operate at low speed or oscillate, the basic static rated load in the axial direction, C0a, is the primary selection criterion. Listed products range widely from 341 to 394000 kN. Convert maximum load and moment to equivalent load, and compare products with a safety factor appropriate to the application.

3. 3. Match mounting diameter and support structure dimensions

   Bore diameter d and outside diameter D determine the mounting surface on the support structure or rotating body, the bolt hole layout, and the space for piping and cables passing through the center. Listed bore diameters range from a few mm to 6457 mm. For large-diameter products, a split design makes transport and assembly easier.

4. 4. Confirm gear position and specifications

   Whether to choose ungeared, internal-tooth or external-tooth types depends on the layout of the drive pinion. Listed products have a pressure angle of 20°. Match the tooth profile (standard or low-profile teeth) and the JIS gear accuracy grade with the pinion side, and consider surface and root induction hardening as required.

5. 5. Select sealing and lubrication method for the operating environment

   In environments exposed to soil or water pressure, some products offer pressure-resistant seals with a static withstand pressure of 0.3 MPa in addition to labyrinth and dust seals. Check the presence of grease nipples and drain ports, and whether grease feeding, oil bath or forced circulation lubrication is used, in line with the maintenance plan.

6. 6. Estimate handling and installation method from mass

   This product: Mass 1 920～6 390 kg

   Listed products vary widely in mass, from 1 to 45800 kg. Large units are constrained by lifting equipment, crane capacity and transport dimensions, so verify the mass and, if necessary, consider circumferentially split designs (two-piece or four-piece).

This guide was written by AI based on the listed products' documents and specification items.

About Slewing Ring Bearings and all products

Description

Double-row tapered roller bearing construction. A large contact angle and large rollers on the axial load side provide a high axial basic load rating. The non-gear side raceway is conventionally hardened, so there is no restriction on mounting position. Used with oil bath lubrication.

FAQ

Q. What are the outside diameter D and mass range of the 2TR… Internal Gear Type Slewing Ring Bearing for Tunnel Boring Machines?

A. The outside diameter D ranges from 2 580 to 3 800 mm, and the mass ranges from 1 920 to 6 390 kg.

Q. What is the construction of the 2TR… Internal Gear Type Slewing Ring Bearing for Tunnel Boring Machines, and how does it achieve a high axial basic load rating?

A. It has a double-row tapered roller bearing construction. A large contact angle and large rollers on the axial load side provide a high axial basic load rating.

Q. What is the application of the 2TR… Internal Gear Type Slewing Ring Bearing for Tunnel Boring Machines, and what lubrication method is used?

A. It is used to support the main cutter of tunnel boring machines and is used with oil bath lubrication.

Q. Is there a restriction on the mounting position of the non-gear side raceway of the 2TR… Internal Gear Type Slewing Ring Bearing for Tunnel Boring Machines?

A. There is no restriction on mounting position because the non-gear side raceway is made of bearing steel with conventional through hardening and has no soft zone.

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

Source documents

• Catalog JTEKT 大形転がり軸受カタログ（技術解説・軸受寸法表）
  Found on: https://koyo.jtekt.co.jp/support/catalog-download/