Slewing Bearing DTR-T Type (Three-Row Combined Cylindrical Roller Type, for Tunnel Boring Machines)
DTR-T形 / JTEKT Corporation (Official website) / Listed on page 6 of the document
A slewing bearing with enhanced shock resistance, high rated load capacity, and high sealing performance, designed to support the main cutter of tunnel boring machines.
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Specifications
| Static pressure resistance (pressure seal) | 0.3 MPa |
|---|---|
| Structure | Three-row combined cylindrical roller bearing |
| Gear Accuracy | JIS B 1702-1976 Grade 7 (standard) |
DTR-T形 model comparison
Compare 3 models in the same series by specification.
| Model | Inner diameter d | Basic static load rating C0a | Gear Pressure Angle | Mass |
|---|---|---|---|---|
| DTR-T形旋回座軸受（トンネル掘進機用・内歯） | 1372〜3996 mm | 11500〜90000 kN | 20 ° | 1050〜10500 kg |
| DTR-T形旋回座軸受（トンネル掘進機用・外歯） | 1055〜3450 mm | 15100〜200000 kN | 20 ° | 1370〜25600 kg |
| 旋回座軸受 DTR-T形（3列複合円筒ころタイプ・トンネル掘進機用） This product | — | — | — | — |
How to choose Slewing Ring Bearings
Points to check when selecting, with the values for this product (Slewing Bearing DTR-T Type (Three-Row Combined Cylindrical Roller Type, for Tunnel Boring Machines)).
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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
This product: Static pressure resistance (pressure seal) 0.3 MPaIn 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
Featuring the same three-row combined cylindrical roller structure as the DTR type, the DTR-T type has enhanced shock resistance, high rated load capacity, and high sealing performance for tunnel boring machines. Oil supply and oil drain ports can be provided for forced circulation lubrication. Sealing options include labyrinth, dust seal, or pressure-resistant seal. A split type, in which the raceway ring is divided in the circumferential direction, has also been developed.
Features
- High shock resistance
- High rated load capacity
- High sealing performance
- Compatible with forced circulation lubrication
- Pressure-resistant seal selectable (static pressure resistance 0.3 MPa)
- Split type available (SP/DTR-T type)
Applications
- Tunnel boring machines
FAQ
- Q. What applications can the DTR-T type (for tunnel boring machines) be used for?
- A. It is a slewing bearing used to support the main cutter of tunnel boring machines. It features enhanced shock resistance, high rated load capacity, and high sealing performance.
- Q. What is the structure and sealing method of the DTR-T type?
- A. It has the same three-row combined cylindrical roller structure as the DTR type. Sealing options include labyrinth, dust seal, or pressure-resistant seal. The static pressure resistance of the pressure-resistant seal is 0.3 MPa.
- Q. Does the DTR-T type support forced circulation lubrication?
- A. Yes, it supports forced circulation lubrication, and oil supply and oil drain ports can be provided.
- Q. Is a split type available for the DTR-T type?
- A. Yes, a split type (SP/DTR-T type), in which the raceway ring is divided in the circumferential direction, has been developed.
- Q. What is the gear accuracy of the DTR-T type?
- 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 6
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