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Slewing Ring Bearing TH Type (Single-Row Ball Type)

TH形 / JTEKT Corporation (Official website) / Listed on page 4 of the document

A compact single-row ball slewing ring bearing that simultaneously supports axial load, radial load and moment with one unit. Commonly used in general construction and material handling machinery.

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Slewing Ring Bearing TH Type (Single-Row Ball Type) on page 4 of JTEKT Corporation "旋回座軸受"
Source: JTEKT Corporation「旋回座軸受」page 4
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Specifications

Structure Four-point contact thrust angular contact ball bearing
Gear Accuracy JIS B 1702-1976 Grade 7 (standard)

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） 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） This product — — — —

How to choose Slewing Ring Bearings

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

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

    This product: Structure Four-point contact thrust angular contact ball bearing

    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

    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 the structure of a four-point contact thrust angular ball bearing, composed of a single row of balls arranged between the outer ring and inner ring. Either the outer ring outside diameter or the inner ring inside diameter is gear-cut, allowing rotation by a pinion gear. Mounting uses bolt holes, and grease lubrication with dust seals is generally applied.

Features

  • Simultaneously accepts axial load, radial load and moment with one bearing
  • Compact single-row ball structure
  • Outer ring or inner ring with gear teeth
  • Grease lubrication possible through grease nipple

Applications

  • Construction machinery
  • Cranes
  • Excavators
  • Boring machines
  • Stackers and reclaimers

FAQ

Q. What loads can the Slewing Ring Bearing TH Type (Single-Row Ball Type) accept simultaneously?
A. It can simultaneously accept axial load, radial load and moment with one bearing.
Q. Where is the gear teeth of the Slewing Ring Bearing TH Type (Single-Row Ball Type) located?
A. Either the outer ring outside diameter or the inner ring inside diameter is gear-cut, allowing rotation by a pinion gear. The outer ring or inner ring has gear teeth.
Q. What are the gear accuracy and structure of the Slewing Ring Bearing TH Type (Single-Row Ball Type)?
A. Gear accuracy is JIS B 1702-1976 Grade 7 (standard). The structure is a four-point contact thrust angular ball bearing.
Q. How is the Slewing Ring Bearing TH Type (Single-Row Ball Type) mounted and greased?
A. Mounting uses bolt holes. Grease can be supplied through a grease nipple, and grease lubrication with dust seals is generally applied.
Q. What kinds of machinery is the Slewing Ring Bearing TH Type (Single-Row Ball Type) used in?
A. It is used in construction machinery, cranes, excavators, boring machines, stackers and reclaimers, among others.

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

Source documents

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