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TH-Type Slewing Ring Bearing (Single-Row Ball, External Gear)

TH形 / JTEKT Corporation (Official website)

External-gear slewing ring bearing with an inner diameter of 115 to 2240 mm. Features a gear on the outer circumference for use in combination with a drive pinion.

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

Specifications

Inner diameter d 115〜2240 mm
Basic static load rating C0a 367〜11500 kN
Mass 10.5〜1300 kg
Gear Pressure Angle 20 °

TH形 model comparison

Compare 4 models in the same series by specification.

Model Inner diameter d Basic static load rating C0a Gear Pressure Angle Mass
TH形旋回座軸受（単列玉タイプ・内歯） 319.5〜3510 mm 644〜15500 kN 20 ° 18.3〜1310 kg
TH形旋回座軸受（単列玉タイプ・外歯） This product 115〜2240 mm 367〜11500 kN 20 ° 10.5〜1300 kg
TH形旋回座軸受（単列玉タイプ・歯なし） 128〜2830 mm 341〜16700 kN — 11.7〜1460 kg
旋回座軸受 TH形（単列玉タイプ） — — — —

How to choose Slewing Ring Bearings

Points to check when selecting, with the values for this product (TH-Type Slewing Ring Bearing (Single-Row Ball, External Gear)).

  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 367〜11500 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 115〜2240 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

    This product: Gear Pressure Angle 20 °

    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 10.5〜1300 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

Single-row ball slewing ring bearing with external gear specifications. Gear data uses a pressure angle of 20°, and the dimension tables list tooth counts and module values.

Features

  • External gear on outer circumference
  • Pressure angle 20°
  • Tooth flank and root hardened specification available

Applications

  • Construction machinery
  • Cranes
  • Industrial machinery

FAQ

Q. What are the inner diameter d and basic static load rating C0a range for the TH-Type Slewing Ring Bearing (Single-Row Ball, External Gear)?
A. Inner diameter d ranges from 115 to 2240 mm, and basic static load rating C0a ranges from 367 to 11500 kN.
Q. What is the pressure angle of the external gear of the TH-Type Slewing Ring Bearing (Single-Row Ball, External Gear), and is a hardened specification available?
A. The gear pressure angle is 20°. Hardened specifications are available for the tooth flank and root.
Q. What applications is the TH-Type Slewing Ring Bearing (Single-Row Ball, External Gear) used for?
A. It is used in construction machinery, cranes, and industrial machinery. The outer gear is used in combination with a drive pinion.
Q. Where can the number of teeth and module of the TH-Type Slewing Ring Bearing (Single-Row Ball, External Gear) be checked?
A. The number of teeth and module are listed in the dimension table.

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

Source documents

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