Editorial Technical Reference

Pivot Assembly (Trunnion)

This page explains how Pivot Assembly (Trunnion) is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A mechanical assembly that provides a rotational pivot point for the hydraulic tilting mechanism, typically consisting of a trunnion shaft mounted within bearings or bushings.

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Product Specifications

Technical details and manufacturing context for Pivot Assembly (Trunnion)

Definition
The Pivot Assembly (Trunnion) is a critical component within a Hydraulic Tilting Mechanism. It serves as the central rotational axis, allowing the attached structure (such as a platform, bucket, or implement) to tilt or articulate under hydraulic control. The assembly typically includes a robust trunnion shaft, mounting flanges, and bearing surfaces designed to withstand significant radial and axial loads while ensuring smooth, controlled rotation. In typical configurations, the trunnion shaft is fixed to the stationary frame of the mechanism, while the tilting structure is attached to the rotating part of the assembly. Hydraulic cylinders apply force to lever arms connected to the structure, causing it to rotate around the fixed axis of the trunnion. Bearings or bushings within the assembly minimize friction during this pivotal movement. The assembly is designed to handle rated load capacities ranging from 50 to 200 kN at the pivot point, with a tilt angle range of 0 to 60 degrees. Shaft diameters typically range from 50 to 150 mm, and bearing types are specified according to ISO 492 precision classes P20 to P5. Radial runout is controlled to 0.02 to 0.05 mm per ISO 1101. Operating temperatures range from -20 to 80 degrees Celsius, with lubrication typically using grease conforming to DIN 51825 (KP2K). Material grades commonly include 42CrMo4 per DIN EN 10083, with surface hardness of 50 to 55 HRC per ISO 18265. Weights vary from 15 to 60 kg depending on size and material. These values are reference ranges for directory purposes; actual specifications must be confirmed with the legal manufacturer or supplier for the specific model and application. The assembly is essential for applications requiring precise and reliable tilting under heavy loads, such as in construction equipment, material handling, and industrial machinery.
Working Principle
The trunnion shaft is fixed to the stationary frame of the mechanism. The tilting structure is attached to the rotating part of the assembly. Hydraulic cylinders apply force to lever arms connected to the structure, causing it to rotate around the fixed axis of the trunnion. Bearings or bushings within the assembly minimize friction during this pivotal movement. The design ensures that radial and axial loads are effectively transmitted to the frame, while the bearing system allows smooth rotation within the specified tilt angle range. Proper lubrication and sealing are critical to maintain performance and prevent contamination.
Common Materials
Alloy Steel, Hardened Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Load Capacity50–200 kNMaximum static load at pivot point
Tilt Angle Range0–60 °Full rotation for tilting mechanism
Shaft Diameter50–150 mmCritical for bearing selection
Bearing TypeP20–P5Precision class for rotational accuracyISO 492
Radial Runout0.02–0.05 mmTighter for high-speed applicationsISO 1101
Operating Temperature-20–80 °CSeals and lubricants limit range
Lubrication TypegreaseKP2K grease recommendedDIN 51825
Material Grade42CrMo4High-strength alloy steelDIN EN 10083
Surface Hardness50–55 HRCInduction hardened for wear resistanceISO 18265
Weight15–60 kgDepends on size and material

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
  • Trunnion Shaft Part
    Provides the central axis of rotation and transmits loads.
    Material: Hardened Alloy Steel
  • Bearing Housing Part
    Houses the bearings or bushings that support the trunnion shaft.
    Material: Cast Steel or Ductile Iron
  • Mounting Flange Part
    Provides a secure interface for attaching the assembly to the machine frame.
    Material: Steel Plate
  • Bearings or Bushings
    The elements the trunnion shaft actually turns in.
  • Shaft Seals
    Keep the lubricant in and contamination out of the bearing cavity.

Applied To / Applications

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

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 MPa (static), 5 MPa (dynamic)
other spec: Max angular velocity: 30 RPM, Max axial load: 50 kN, Max radial load: 100 kN
temperature: -20°C to +80°C
Media Compatibility
✓ Hydraulic oil (ISO VG 32-68) ✓ Water-glycol fluids ✓ Industrial lubricating greases (NLGI 2)
Unsuitable: High-concentration abrasive slurries (>20% solids by weight)
Sizing Data Required
  • Shaft diameter and required torque capacity
  • Maximum angular deflection and oscillation angle
  • Radial and axial load requirements with safety factor

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Bearing seizure
Cause: Inadequate lubrication leading to metal-on-metal contact and overheating
Trunnion wear/ovality
Cause: Excessive radial loads or misalignment causing uneven stress distribution
Maintenance Indicators
  • Unusual grinding or screeching noises during rotation
  • Visible metal particles in lubricant or excessive vibration
Engineering Tips
  • Implement precision laser alignment during installation and periodic re-alignment checks
  • Establish automated lubrication monitoring with temperature and vibration sensors for predictive maintenance

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ANSI B18.2.1 - Square and hex bolts and screws DIN 71802 - Trunnion bearings for general engineering

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.025mm
  • Surface flatness: 0.08mm per 100mm
Quality Inspection
  • Dimensional verification with CMM (Coordinate Measuring Machine)
  • Magnetic particle inspection for surface cracks

Manufacturers of Pivot Assembly (Trunnion)

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Frequently Asked Questions

What is the typical load capacity of a Pivot Assembly (Trunnion)?

According to directory data, the rated load capacity at the pivot point ranges from 50 to 200 kN. However, the exact capacity depends on the specific model and application. Always verify with the manufacturer or supplier.

What materials are commonly used for the trunnion shaft?

Common materials include alloy steel and hardened steel, with a typical material grade of 42CrMo4 per DIN EN 10083. Surface hardness is often 50-55 HRC per ISO 18265. Confirm material specifications with the supplier.

How is the tilt angle range defined?

The tilt angle range is typically 0 to 60 degrees, as listed in the directory. This range is determined by the design of the mechanism and the hydraulic cylinder stroke. Verify the exact range for your application.

What maintenance is required for the pivot assembly?

Regular lubrication with grease conforming to DIN 51825 (KP2K) is recommended. Inspect seals and bearings for wear, and check for excessive radial runout (0.02-0.05 mm per ISO 1101). Follow manufacturer guidelines for service intervals.

Data Basis

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

Preliminary Technical Classification
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