Slewing Bearing DTR Type (Three-Row Combined Cylindrical Roller Type)
DTR形 / JTEKT Corporation (Official website) / Listed on page 4 of the document
Slewing bearing with a three-row combined cylindrical roller structure, offering high rigidity and high load rating. Used in cranes, ship loaders, large rotating equipment, and similar applications.
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Specifications
| Structure | Three-row combined cylindrical roller bearing |
|---|---|
| Gear Accuracy | JIS B 1702-1976 Grade 7 (standard) |
How to choose Slewing Ring Bearings
Points to check when selecting, with the values for this product (Slewing Bearing DTR Type (Three-Row Combined Cylindrical Roller Type)).
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1. Select a structure that suits load and moment
This product: Structure Three-row combined cylindrical roller bearingSingle-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.
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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.
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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.
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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.
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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.
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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.
Description
Consists of three raceway rings, created by splitting either the outer ring or the inner ring into two in the axial direction, and three rows of cylindrical roller sets. One row carries radial load, another row carries axial load and moment, and the remaining row carries moment. Suitable for applications requiring high rigidity and high load rating.
Features
- High rigidity from three-row combined cylindrical roller structure
- High load rating
- Raceway ring structure split into two in the axial direction
Applications
- Cranes
- Ship loaders
- Stackers and reclaimers
- Swing towers for continuous casting machines
- Large rotating equipment
FAQ
- Q. For which applications is the DTR Type (Three-Row Combined Cylindrical Roller Type) slewing bearing suitable?
- A. It is used in cranes, ship loaders, stackers and reclaimers, swing towers for continuous casting machines, large rotating equipment, and similar applications. It is suitable for applications requiring high rigidity and high load rating.
- Q. What is the internal structure of the DTR Type slewing bearing, and what load does each row carry?
- A. It consists of three raceway rings, created by splitting either the outer ring or the inner ring into two in the axial direction, and three rows of cylindrical roller sets. One row carries radial load, another row carries axial load and moment, and the remaining row carries moment.
- Q. Which standard does the gear accuracy of the DTR Type slewing bearing comply with?
- A. The gear accuracy is JIS B 1702-1976 Grade 7 (standard).
Written by AI based on the content of the source documents.
Source documents
- Catalog 旋回座軸受 Open page 4
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