Slewing Bearing & Drive for Ship Loaders

Product Specifications

Technical details and manufacturing context for Slewing Bearing & Drive

Definition

The Slewing Bearing & Drive is a critical component of a ship loader, responsible for enabling the horizontal rotation (slewing) of the loader's boom or arm to position it accurately over different holds of a ship. It combines a large-diameter bearing that supports radial, axial, and moment loads with a drive system (typically comprising a motor, gearbox, and pinion) to provide controlled rotational torque. This allows the ship loader to traverse along the quay and service multiple ship hatches efficiently during bulk material loading/unloading operations. The bearing is typically made of alloy steel, with case-hardened steel for durability, and uses rolling elements such as balls or rollers. Key parameters include a rated torque of 50–200 kN·m, a slewing diameter of 1000–3000 mm, and maximum axial and radial loads of 500–2000 kN and 200–800 kN, respectively. The maximum tilting moment is 500–2000 kN·m, and rotation speed ranges from 0.1 to 1.5 r/min for precise positioning. Positioning accuracy is ±0.1°, and drive motor power is 5–30 kW. Supply voltage is 380–690 V AC per IEC 60038, operating temperature is -20 to 50 °C, and ingress protection is IP54–IP65 per IEC 60529. The bearing material is specified as 42CrMo4 per DIN EN 10083-3, and the weight ranges from 500 to 3000 kg. These values are directory reference ranges and must be confirmed for the specific model and application. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The slewing bearing, a large rolling-element bearing, supports the rotating superstructure of the ship loader on its fixed base. The drive system's motor provides rotational force, which is transmitted and amplified through a gearbox. The gearbox output shaft drives a pinion gear that meshes with a gear ring integrated into the slewing bearing's raceway. This engagement converts the motor's torque into controlled rotational movement of the loader's upper structure. The bearing handles radial, axial, and moment loads, while the drive ensures precise positioning. The system operates within specified torque, speed, and load limits to ensure reliable performance.

Common Materials

Alloy Steel, Case-Hardened Steel, Rolling Elements (Balls or Rollers)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Torque	50–200 kN·m	Determines the drive's ability to rotate the boom under load.
Slewing Diameter	1000–3000 mm	Defines the physical size and load capacity of the bearing.
Max Axial Load	500–2000 kN	Critical for supporting the weight of the boom and cargo.
Max Radial Load	200–800 kN	Resists lateral forces from wind and cargo swing.
Max Tilting Moment	500–2000 kN·m	Prevents overturning under eccentric loads.
Rotation Speed	0.1–1.5 r/min	Typical operating speed for precise positioning.
Positioning Accuracy	±0.1 °	Ensures accurate boom placement for loading operations.
Drive Motor Power	5–30 kW	Sized to overcome friction and inertia during rotation.
Supply Voltage	380–690 V AC	Standard industrial three-phase voltage range.IEC 60038
Operating Temperature	-20–50 °C	Limits for reliable operation in outdoor environments.
Ingress Protection	IP54–IP65	Protects against dust and water jets.IEC 60529
Bearing Material	42CrMo4	High-strength alloy steel for durability.DIN EN 10083-3
Weight	500–3000 kg	Affects installation and structural support requirements.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Slewing Bearing (Ring)
Supports radial, axial, and moment loads while enabling smooth rotation between the ship loader's fixed base and rotating superstructure.

Material: Case-Hardened Alloy Steel
Gear Ring Part
Integrated into the bearing's outer or inner raceway; meshes with the drive pinion to transmit rotational force.

Material: Case-Hardened Alloy Steel
Drive Motor
Provides the primary rotational torque for slewing motion, typically an electric AC or hydraulic motor.

Material: Various (Electrical Components, Steel Housing)
Gearbox/Reducer
Amplifies the motor's torque and reduces speed to achieve the required slewing force and control.

Material: Alloy Steel Gears, Cast Iron Housing
Drive Pinion Part
Final output gear from the drive train that directly engages with the slewing bearing's gear ring.

Material: Case-Hardened Alloy Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Slewing Bearing & Drive.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Ship Loader

View system integration details

Manufacturers of Slewing Bearing & Drive

Manufacturer profiles associated with Slewing Bearing & Drive.

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Frequently Asked Questions

What is the primary function of a slewing bearing and drive in a ship loader?

It enables the horizontal rotation of the loader's boom or arm, allowing precise positioning over ship holds for efficient loading and unloading.

What are the typical load ratings for this component?

Typical ranges include maximum axial load of 500–2000 kN, radial load of 200–800 kN, and tilting moment of 500–2000 kN·m, but these must be confirmed for the specific model.

What standards apply to the electrical and protection specifications?

Supply voltage follows IEC 60038 (380–690 V AC), and ingress protection is rated IP54–IP65 per IEC 60529. These are reference standards; verify compliance with the manufacturer.

How should I verify the suitability of this component for my application?

Check the manufacturer's datasheet for exact values of torque, load, speed, and environmental limits. Confirm that the operating conditions (temperature, exposure) are within the specified ranges.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Max 10 MPa (100 bar) axial/radial load
other spec:	Max rotational speed: 5 RPM, Slurry concentration: ≤60% solids by weight
temperature:	-20°C to +80°C

Slewing Bearing & Drive

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards