Slewing Ring Bearing
JTEKT Corporation (Official website) / Listed on page 37 of the document
Design and manufacturing specification sheet for slewing ring bearings of types TH, DTH, THR, DTR, DTR-T, and 2TR. A form for requesting quotations and design by entering machine conditions.
Last verified: (date the content was verified against the source document)
A reduced image of the relevant page is quoted from the document. Copyright belongs to JTEKT Corporation.Request removal
Specifications
| Gear Pressure Angle | 20° |
|---|---|
| Tooth Profile | Regular tooth |
| Gear Accuracy | JIS B 1702-1976 Grade 7 |
How to choose Slewing Ring Bearings
Points to check when selecting, with the values for this product (Slewing Ring Bearing).
-
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. 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. 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. 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. 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. 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
Request by entering slewing shaft gear specifications, load conditions, rotational speed, lubrication and sealing methods, mounting position, and other details. JTEKT standard specifications serve as the baseline; other specifications are subject to individual consultation.
FAQ
- Q. Which types of slewing ring bearings are covered by the design and manufacturing specification sheet?
- A. Slewing ring bearings of types TH, DTH, THR, DTR, DTR-T, and 2TR are covered.
- Q. How should the gear specifications for a slewing ring bearing be entered?
- A. The pressure angle is 20°, the tooth profile is standard (full-depth) tooth, and the gear accuracy is Grade 7 per JIS B 1702-1976 as the baseline.
- Q. Can a slewing ring bearing be requested with standard specifications unchanged?
- A. Requests are based on JTEKT standard specifications; other specifications are subject to individual consultation.
Written by AI based on the content of the source documents.
Source documents
- Catalog 旋回座軸受 Open page 37
Similar products (other manufacturers)
Slewing Ring Bearings products, ordered by similarity of specifications and applications.
-
Deep Groove Ball Bearings
SKF Explorer 6309
Model: 6309
Deep groove ball bearing with a 45 mm bore and 100 mm outside diameter. With a basic dynamic load rating of 55.3 kN, the calculation example uses it for life evaluation at 3000 r/min.
SKF
-
Deep Groove Ball Bearings
Deep Groove Ball Bearing
A versatile, non-separable ball bearing suitable for high and ultra-high speeds. It accepts both radial and axial loads and requires little maintenance.
SKF
-
Cylindrical Roller Bearings
RCC Bearing (Sealed Cylindrical Roller Bearing for Railway Vehicle Axle Boxes)
A sealed double-row cylindrical roller bearing unit for railway vehicle axle boxes. Seals at both ends and long-life grease enhance maintainability and reliability.
NSK
-
Needle roller bearings
Needle Roller Bearing with Cage
Needle roller bearing with a cage that guides the rollers. Small diameter with high load capacity, low friction, suitable for high-speed rotation. Also suitable for oscillating applications.
NTN Corporation
-
Needle roller bearings
Full Complement Drawn Cup Needle Roller Bearing
A needle roller bearing without a cage, with a large number of rollers to achieve high load capacity. Suitable for high-load, low-speed, and oscillating applications.
NTN Corporation
More products from JTEKT Corporation
See all →-
Slewing Ring Bearings
DTR…T Internal Gear Type Slewing Ring Bearing for Tunnel Boring Machines
Three-row combined cylindrical roller slewing ring bearing for supporting the main cutter of tunnel boring machines. Internal gear type, available in many sizes with outer diameters of 2 550 to 5 200 mm.
JTEKT Corporation
-
Slewing Ring Bearings
2TR… Internal Gear Type Slewing Ring Bearing for Tunnel Boring Machines
Double-row tapered roller slewing ring bearing for supporting the main cutter of tunnel boring machines. Features a large contact angle and high axial basic load rating.
JTEKT Corporation
-
Slewing Ring Bearings
Slewing Bearing for Swing Tower Support (DTR Type)
High-rigidity slewing bearing that accommodates radial, axial and moment loads. Sealing structure also prevents foreign matter ingress.
JTEKT Corporation
-
Slewing Ring Bearings
Slewing Ring Bearing TH Type (Single-Row Ball Type)
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.
JTEKT Corporation
-
Slewing Ring Bearings
Slewing Bearing DTR Type (Three-Row Combined Cylindrical Roller Type)
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.
JTEKT Corporation
-
Slewing Ring Bearings
Slewing Bearing DTR-T Type (Three-Row Combined Cylindrical Roller Type, for Tunnel Boring Machines)
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.
JTEKT Corporation