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DTR-Type Slewing Ring Bearing (Triple-Row Combined Cylindrical Roller Type, Ungeared)

DTR形 / JTEKT Corporation (Official website)

Triple-row combined cylindrical roller slewing ring bearing with bore diameter of 995 to 4385 mm. Ungeared bearing body for large machinery.

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

Specifications

Inner diameter d 995〜4385 mm
Basic static load rating C0a 3270〜85500 kN
Mass 525〜6680 kg

How to choose Slewing Ring Bearings

Points to check when selecting, with the values for this product (DTR-Type Slewing Ring Bearing (Triple-Row Combined Cylindrical Roller Type, Ungeared)).

  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

    This product: Basic static load rating C0a 3270〜85500 kN

    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 995〜4385 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 525〜6680 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

Large slewing ring bearing using triple-row combined cylindrical rollers. Used in applications such as swing towers for continuous casting machines.

Features

  • Triple-row combined cylindrical roller structure
  • Supports large diameters

Applications

  • Continuous casting machines
  • Large industrial machinery

FAQ

Q. What is the bore diameter range of the DTR-Type Slewing Ring Bearing (Ungeared)?
A. The bore diameter ranges from 995 to 4385 mm.
Q. What applications is the DTR-Type Slewing Ring Bearing (Ungeared) used for?
A. It is used in swing towers for continuous casting machines and other applications. It is an ungeared bearing body for large industrial machinery.
Q. What are the basic static load rating and mass of the DTR-Type Slewing Ring Bearing (Ungeared)?
A. The basic static load rating C0a is 3270 to 85500 kN, and the mass is 525 to 6680 kg.
Q. What are the structural features of the DTR-Type Slewing Ring Bearing (Ungeared)?
A. It has a triple-row combined cylindrical roller structure and supports large diameters.

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

Source documents

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