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DTR…T Internal Gear Type Slewing Ring Bearing for Tunnel Boring Machines

DTR…T形内歯 / JTEKT Corporation (Official website)

Three-row combined cylindrical roller slewing ring bearing for supporting the main cutter of tunnel boring machines. Internal gear type, available in many sizes with outer diameters of 2 550 to 5 200 mm.

Last verified: (date the content was verified against the source document)

Specifications

Outer diameter D 2 550～5 200 mm
Inner diameter d 2 096～4 176 mm
Mass 2 140～10 500 kg

How to choose Slewing Ring Bearings

Points to check when selecting, with the values for this product (DTR…T 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

    This product: Inner diameter d 2 096～4 176 mm

    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 2 140～10 500 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

Features a three-row combined cylindrical roller bearing structure with high impact resistance and high rated load. Lubrication ports and drain ports for forced circulation lubrication can be provided. Sealing options include labyrinth, dust seal, and pressure-resistant seal.

Features

  • High impact resistance and high rated load
  • Lubrication and drain ports can be provided
  • Pressure-resistant seal with static pressure resistance of 0.3 MPa available
  • Split type (SP/DTR…T type) also developed

Applications

  • Main cutter support for tunnel boring machines

FAQ

Q. What are the outer and inner diameter ranges of the DTR…T internal gear type slewing ring bearing for tunnel boring machines?
A. The outer diameter D ranges from 2 550 to 5 200 mm, and the inner diameter d ranges from 2 096 to 4 176 mm.
Q. What is the structure of the DTR…T internal gear type, and what are its impact resistance and rated load?
A. It has a three-row combined cylindrical roller bearing structure, providing high impact resistance and high rated load.
Q. Can the DTR…T internal gear type be fitted with lubrication and drain ports, and what sealing methods are available?
A. Lubrication ports and drain ports for forced circulation lubrication can be provided. Sealing options include labyrinth, dust seal, and pressure-resistant seal.
Q. What is the static pressure resistance of the pressure-resistant seal for the DTR…T internal gear type?
A. A pressure-resistant seal with static pressure resistance of 0.3 MPa can be selected.
Q. What is the mass of the DTR…T internal gear type, and is a split type available?
A. The mass is 2 140 to 10 500 kg. A split type (SP/DTR…T type) has also been developed.

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

Source documents

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