Slewing Ring / Rotating Bearing for Motor Vehicle Steering Pods

Product Specifications

Technical details and manufacturing context for Slewing Ring / Rotating Bearing

Definition

A slewing ring, also known as a rotating bearing, is a large-diameter bearing designed to facilitate controlled rotational movement between two structures while supporting substantial combined loads. In motor vehicle manufacturing, this component is critical in steering pods, where it enables the pod assembly to rotate relative to the vessel's hull or mounting structure. It bears the entire weight and operational loads of the pod, ensuring smooth and precise steering and maneuvering.

The bearing consists of an integrated raceway with rolling elements—either balls or rollers—positioned between inner and outer rings. It is mounted between the stationary and rotating sections of the steering pod. Hydraulic or electric drive systems engage with a gear ring, which may be integrated or attached, to induce precise rotational motion. This torque is transferred through the bearing to turn the pod and its propeller.

Materials commonly used include alloy steel (e.g., 42CrMo4) and case-hardened steel, selected for durability and load-bearing capacity. The product is available in a range of sizes and performance specifications, with outer diameters from 200 to 6000 mm, inner diameters from 100 to 5000 mm, and axial load capacities from 50 to 5000 kN. Radial load capacity ranges from 30 to 3000 kN, and tilting moment capacity from 10 to 1000 kN·m. Rotational speeds are typically 0.1 to 30 rpm, and operating temperatures range from -40°C to 85°C. Tolerance classes P0 to P5 apply, with radial and axial runout between 0.02 and 0.10 mm. Friction torque at start-up ranges from 5 to 500 N·m, and weight varies from 10 to 5000 kg. Ingress protection ratings are IP54 to IP65.

These values are reference ranges and must be verified for the specific model and application. Standards such as ISO 128, ISO 76, ISO 15312, ISO 492, and IEC 60529 are referenced for dimensions, load ratings, speed, tolerances, and protection, but do not imply certification. Always confirm model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The slewing ring operates on the principle of an integrated raceway with rolling elements (balls or rollers) between inner and outer rings. The bearing is mounted between the stationary and rotating sections of the steering pod. Hydraulic or electric drive systems engage with a gear ring, either integrated or attached, to induce precise rotational motion. This torque is transferred through the bearing to turn the pod and its propeller, enabling controlled steering and maneuvering.

Common Materials

Alloy Steel (e.g., 42CrMo4), Case-Hardened Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Outer Diameter	200–6000 mm	Standard range for motor vehicle applicationsISO 128
Inner Diameter	100–5000 mm	Matches shaft or housing fitISO 128
Axial Load Capacity	50–5000 kN	Static load ratingISO 76
Radial Load Capacity	30–3000 kN	Static load ratingISO 76
Tilting Moment Capacity	10–1000 kN·m	Critical for moment loadsISO 76
Rotational Speed	0.1–30 rpm	For continuous operationISO 15312
Operating Temperature	-40–85 °C	Standard range; special seals for extremesISO 492
Radial Runout	0.02–0.10 mm	Tolerance class P0 to P5ISO 492
Axial Runout	0.02–0.10 mm	Tolerance class P0 to P5ISO 492
Friction Torque	5–500 N·m	At start-up; depends on seal typeISO 15312
Weight	10–5000 kg	Depends on size and design
Ingress Protection	IP54–IP65	Higher for harsh environmentsIEC 60529

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

Inner Ring Part
Stationary or rotating raceway attached to one structure (e.g., hull).

Material: Alloy Steel
Outer Ring
Rotating or stationary raceway attached to the opposing structure (e.g., pod housing).

Material: Alloy Steel
Rolling Elements Part
Balls or rollers that reduce friction and enable smooth rotation between rings.

Material: Bearing Steel (e.g., GCr15)
Seals Part
Protect the internal raceway and rolling elements from contamination (water, debris).

Material: Synthetic Rubber (e.g., NBR)
Gear Ring Part
Integrated or mounted gear teeth that mesh with the drive pinion for rotational actuation.

Material: Case-Hardened Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Slewing Ring / Rotating Bearing.

Applied To / Applications

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

Steering pod

View system integration details

Manufacturers of Slewing Ring / Rotating Bearing

Manufacturer profiles associated with Slewing Ring / Rotating Bearing.

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Frequently Asked Questions

What are the typical load capacities of a slewing ring?

According to the directory, axial load capacity ranges from 50 to 5000 kN, radial from 30 to 3000 kN, and tilting moment from 10 to 1000 kN·m. These are static load ratings per ISO 76 and must be verified for the specific model.

What materials are commonly used for slewing rings?

Common materials include alloy steel (e.g., 42CrMo4) and case-hardened steel. These are listed in the directory and are typical for durability and load-bearing performance.

What standards apply to slewing rings?

Relevant standards include ISO 128 for dimensions, ISO 76 for load ratings, ISO 15312 for speed and friction, ISO 492 for tolerances, and IEC 60529 for ingress protection. These are reference standards; compliance must be confirmed with the manufacturer.

How do I select the right slewing ring for my application?

Selection requires considering the required outer and inner diameters, load capacities (axial, radial, tilting moment), rotational speed, operating temperature, tolerance class, and environmental protection. Always verify these parameters with the legal manufacturer or supplier for your specific application.

Data Basis

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

Preliminary Technical Classification

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pressure:	N/A (bearing load capacity instead)
temperature:	-40°C to +120°C (standard), up to +200°C with special seals/lubrication
max axial load:	50 kN to 50,000 kN depending on size/design
max moment load:	100 kN·m to 100,000 kN·m depending on size/design
max radial load:	30 kN to 30,000 kN depending on size/design
rotational speed:	0.1 to 30 RPM (typical for large industrial applications)
sealing IP rating:	IP65 to IP68 depending on seal type

Slewing Ring / Rotating Bearing

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards