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

TH形 / JTEKT Corporation (Official website)

Internal-gear slewing ring bearing with bore diameter of 319.5 to 3510 mm. Equipped with gear teeth, it forms a slewing mechanism in combination with a drive pinion.

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

Specifications

Inner diameter d 319.5〜3510 mm
Basic static load rating C0a 644〜15500 kN
Mass 18.3〜1310 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） This product 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） 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 Series Slewing Ring Bearing (Single-Row Ball Type, Internal 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 644〜15500 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 319.5〜3510 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 18.3〜1310 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 type slewing ring bearing with internal gear specification. Gear specifications use a pressure angle of 20°, with module and number of teeth shown in the dimension table.

Features

  • Internal gear teeth
  • Pressure angle 20°
  • Tooth flank and tooth root induction hardening available

Applications

  • Construction machinery
  • Cranes
  • Industrial machinery

FAQ

Q. What is the bore diameter range and basic static load rating C0a of the TH Series Slewing Ring Bearing (Single-Row Ball Type, Internal Gear)?
A. Bore diameter d ranges from 319.5 to 3510 mm, and basic static load rating C0a ranges from 644 to 15500 kN.
Q. Where can the pressure angle, module, and number of teeth of the gear in the TH Series Slewing Ring Bearing be found?
A. The gear pressure angle is 20°. The module and number of teeth are shown in the dimension table.
Q. Does the TH Series Slewing Ring Bearing have induction hardening on the tooth flanks and tooth roots?
A. Yes, induction hardening is available for the tooth flanks and tooth roots.
Q. What applications is the TH Series Slewing Ring Bearing used for?
A. It is used in construction machinery, cranes, and industrial machinery. It forms a slewing mechanism in combination with a drive pinion.

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

Source documents

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