SWBTEC
internal gear slewing bearing
An internal gear slewing bearing places the gear teeth on the inner ring, allowing a matching pinion to transmit rotation inside the bearing envelope. The bearing supports a rotating connection while carrying a defined combination of axial load, radial load and overturning moment.
SWBTEC supplies internal-, external- and toothless slewing-bearing configurations. The specified range includes an internally geared, externally flanged design and a single-row ball platform with internal-gear options. Share the load case, speed, envelope, gear data and installation conditions for a suitable quotation.
Slewing Bearing With Internal Gear
What an Internal Gear Slewing Bearing Does
An internal gear slewing bearing combines a large-diameter rolling support with a gear interface. Its inner-ring teeth mesh with a pinion from inside the ring, while the rolling elements transfer the load between the two rings and allow controlled relative rotation.
Integrated support and rotation
The inner ring, outer ring, raceways and rolling elements form the primary support. The system can carry axial force, radial force and overturning moment together when the load combination, bearing structure and mounting are suitable.
Compact gear arrangement
Internal teeth keep the gear mesh inside the bearing diameter. This can help when the outside envelope needs to remain clear, but the pinion, center distance, access and mounting structure still need to be designed as one interface.
Defined system boundary
The bearing is not automatically a complete slew drive. A quotation should state whether the pinion, gearbox, motor, brake, encoder, guards and lubrication equipment are supplied separately or as part of a larger assembly.
Grinding, heat treatment, gear machining, sealing, lubrication, support stiffness and bolt connection all affect the operating result. A product name or outside diameter alone cannot confirm interchangeability.
Structure and Performance Factors
The bearing structure determines how forces move through the raceways and how the gear transmits torque. Single-row ball, double-row ball and roller arrangements serve different combinations of load, stiffness, space, speed and service conditions.
| Factor | What it covers | Why it matters |
|---|---|---|
| Rolling structure | Ball or roller arrangement, raceway geometry, contact angle and clearance or preload | Changes load distribution, stiffness, friction and permissible operating conditions. |
| Gear interface | Internal or external teeth, module, tooth count, pressure angle, tooth width, accuracy and hardening | Sets pinion matching, torque transmission, contact stress, backlash and service requirements. |
| Mounting interface | Outside and inside diameters, height, bolt holes, locating features and rotation ring | Controls load transfer, alignment, center distance and replacement compatibility. |
| Operating conditions | Axial and radial loads, overturning moment, speed, duty cycle, temperature, dust, water and corrosion | Defines the calculation case, sealing, lubrication, material and inspection scope. |
Installation flatness and support rigidity are part of the bearing application. Deformation in the connected structure can change raceway loading and gear contact even when the bearing catalogue dimensions remain unchanged.
SWBTEC Internal Gear and Single-Row Ball Options
The specified SWBTEC products provide two useful starting points for an internal gear slewing bearing project: a flanged internal-tooth design with listed gear data, and a single-row ball platform offered in toothless, external-gear and internal-gear versions.
Slewing Bearing With Internal Gear
An internal-tooth, externally flanged slewing bearing for compact layouts and stable pinion transmission. The product page lists construction machinery, ship-deck machinery and radar-base applications.
- Listed modelsSW-414N.20 to SW-1094N.20
- Configuration size D518–1,198 mm
- Structural height H56 mm
- Gear module5–8
- Tooth count Z67–125
Single Row Ball Slewing Bearing
A single-row ball slewing-bearing platform with QU, QW and QN versions for toothless, external-gear and internal-gear configurations. The product page identifies cranes and excavators among its applications.
- Bearing structureSingle-row ball
- Listed versionsQU, QW and QN
- Gear optionsToothless, external gear and internal gear
- Listed configuration sizes315.20 to 2500.60
- Application examplesCranes and excavators
Applications and Internal-Gear Selection
Internal gear bearings are used where a rotating structural connection and a ring-mounted drive interface must fit within a defined machine envelope. The choice between internal, external and toothless versions should follow the load path, pinion location, maintenance access and required motion.
Construction and lifting equipment
Excavators, cranes and aerial work platforms combine rotation with axial load, radial load and overturning moment. Confirm the load spectrum, rotation speed, starting and stopping frequency, bolt connection and support stiffness.
Ship-deck machinery and radar bases
The internally geared flanged design is presented for compact layouts and stable transmission in these applications. Verify corrosion exposure, sealing, mounting orientation, drive access and the required inspection plan.
Industrial rotary tables
Packing, filling, material-handling and other rotary equipment may use slewing bearings for support and positioning. Selection depends on indexing accuracy, duty cycle, speed, moment load, backlash and interface dimensions.
Replacement and custom projects
Use the original drawing, measured interfaces and operating record when replacing a bearing. Matching the outside diameter and hole pattern is not enough; gear data, height, clearance, load, sealing and rotation direction also need confirmation.
Inputs for Selection and Quotation
A quotation-ready request describes the actual motion and load case instead of only naming an equipment category. These inputs allow the bearing, gear interface, mounting, lubrication and inspection scope to be reviewed together.
| Input | Information to provide | Selection impact |
|---|---|---|
| Combined loads | Axial force, radial force and overturning moment, including directions and simultaneous conditions | Determines the load point, bearing structure, bolt check and support requirements. |
| Motion and duty | Continuous rotation, oscillation or indexing; speed, acceleration, cycle frequency, operating hours and design life | Sets lubrication, heat, clearance, gear contact and service expectations. |
| Geometry and mounting | Inside and outside diameters, height, bolt holes, locating features, installation direction and available envelope | Controls fit, alignment, center distance, access and replacement compatibility. |
| Gear and drive | Internal or external teeth, module, tooth count, pressure angle, tooth width, pinion, gearbox, brake and control interface | Defines the mesh, torque path, backlash, safety and supply boundary. |
| Environment and documents | Temperature, dust, water, salt, corrosion, cleaning, drawings, acceptance criteria and required reports | Guides sealing, materials, surface treatment, packaging, testing and delivery records. |
Manufacturing and Quality Checks
SWBTEC product information describes a process that connects material inspection, machining, heat treatment, gear work, assembly and final inspection. The exact route depends on the bearing structure, size, gear data, materials and order requirements.
- Prepare the rings. Inspect the incoming forging, rough-machine the reference surfaces and use ultrasonic inspection when required for internal material defects.
- Process the raceways and gear. Machine the raceway and mounting features, then apply the specified raceway and tooth heat-treatment route. Hardness, hardened depth, cracks and deformation require controlled acceptance criteria.
- Finish and assemble. Complete precision machining, hole and thread checks, rolling-element and seal installation, clearance or preload checks, lubrication and protective packaging.
- Record the finished condition. Relevant checks can include height, axial and radial clearance, axial and radial runout, gear runout, tooth thickness, tooth count, hardness and visual condition.
Inspection reports should be tied to the exact model, serial number, drawing revision and test results. A quality-system statement or a general certificate does not replace product-specific dimensional, gear and load verification.
Internal Gear Slewing Bearing FAQ
How is an internal gear slewing bearing different from an external gear type?
Internal gear teeth are machined on the inner ring and mesh with a pinion inside the ring. External gear teeth are on the outer ring. The better arrangement depends on the available envelope, pinion position, access, load path, maintenance and required protection.
Does the bearing include the pinion or complete slew drive?
Supply scope must be confirmed for each quotation. A slewing bearing can be supplied as the load-supporting bearing, while the pinion, gearbox, motor, brake, encoder, guard and control equipment may be separate components.
How should the raceway and gear be lubricated?
The raceway and gear mesh may require separate lubrication arrangements. Use the product instructions for lubricant type, quantity and interval, and rotate the bearing slowly during greasing so the lubricant distributes around the working circumference.
Can I replace a bearing by matching only its outside diameter?
No. Verify height, mounting holes, locating features, gear module and tooth count, clearance or preload, load capacity, seal, rotation ring, installation direction and the condition of the connected support and pinion.
What should I send for a technical review?
Send the application, combined loads, movement profile, speed, duty cycle, envelope drawing, mounting pattern, internal or external gear requirement, pinion data, environment, lubricant and target service life. A controlled drawing and acceptance plan make the quotation easier to compare.
Request a Quote for an Internal Gear Slewing Bearing
- Phone: +86 5634113031
- Email: [email protected]
- WhatsApp: -18098500983
- Address: Ningguo Dadao, Ningguo Economic Develope Zone, Ningguo,Xuancheng,Anhui,China
