Luffing Hinge for Cranes | Component Directory

Product Specifications

Technical details and manufacturing context for Luffing Hinge

Definition

The luffing hinge is a critical mechanical component in luffing jib systems, serving as the pivot point that allows the jib to be raised or lowered (luffed) to adjust its working radius and clearance. It connects the jib to the crane's mast or slewing ring, transmitting loads while permitting controlled rotational movement. This hinge is designed for heavy-duty applications in the transport equipment manufacturing industry, particularly for cranes and other lifting machinery. It operates on a pin-and-bushing or bearing system, allowing rotation around a fixed axis. Hydraulic cylinders or winch systems apply force to one side of the hinge, creating torque that changes the jib's angle. The hinge's design ensures smooth articulation while withstanding significant bending moments, shear forces, and compression loads during lifting operations. The luffing hinge is typically manufactured from high-strength alloy steel or forged steel, with bronze bushings or bearings to reduce friction and wear. Key parameters include a rated load capacity of 50–200 tonnes at minimum radius, a luffing angle range of 0–80 degrees, an operating pressure of 25–35 MPa, a bearing diameter of 300–800 mm, a tolerance of ±0.5 mm (per ISO 2768-m), an operating temperature range of -20 to 60 degrees Celsius, ingress protection ratings of IP65–IP67 (per IEC 60529), material grades Q345B–Q460C (per GB/T 1591), and a weight of 1500–5000 kg. These values are directory reference ranges and must be confirmed for the specific model and application. The hinge is a component that requires careful selection based on crane design, load requirements, and environmental conditions. Verification of model-specific values and standards should be conducted with the legal manufacturer or supplier.

Working Principle

The luffing hinge operates on a pin-and-bushing or bearing system, allowing rotation around a fixed axis. Hydraulic cylinders or winch systems apply force to one side of the hinge, creating torque that changes the jib's angle. The hinge's design ensures smooth articulation while withstanding significant bending moments, shear forces, and compression loads during lifting operations. The hinge must be properly lubricated and sealed to maintain performance and prevent contamination.

Common Materials

High-strength alloy steel, Forged steel, Bronze bushings/bearings

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Load Capacity	50–200 t	Maximum load at minimum radius
Luffing Angle Range	0–80 °	Full range for jib positioning
Operating Pressure	25–35 MPa	Hydraulic system pressure
Bearing Diameter	300–800 mm	Matches jib size
Tolerance	±0.5 mm	Ensures alignmentISO 2768-m
Operating Temperature	-20–60 °C	Seals and lubrication limits
Ingress Protection	IP65–IP67	Dust and water resistanceIEC 60529
Material Grade	Q345B–Q460C	High-strength steelGB/T 1591
Weight	1500–5000 kg	Affects crane counterweight

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

Hinge Pin Part
Central axle providing the pivot point for rotation

Material: Hardened alloy steel
Bushings/Bearings Part
Reduce friction between moving parts and distribute loads

Material: Bronze or roller bearings
Hinge Plates Part
Structural plates that connect to jib and mast, transmitting forces

Material: High-strength steel plate
Lubrication Ports Part
Provide access for greasing moving components

Material: Steel fittings

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Luffing Hinge.

Applied To / Applications

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

Luffing Jib

View system integration details

Manufacturers of Luffing Hinge

Manufacturer profiles associated with Luffing Hinge.

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Frequently Asked Questions

What is the primary function of a luffing hinge?

The luffing hinge serves as the pivot point for a luffing jib, allowing it to be raised or lowered to adjust the working radius and clearance of the crane.

What materials are commonly used for luffing hinges?

High-strength alloy steel, forged steel, and bronze bushings or bearings are typical materials, as listed in the directory.

What are the key parameters to consider when selecting a luffing hinge?

Key parameters include rated load capacity, luffing angle range, operating pressure, bearing diameter, tolerance, operating temperature, ingress protection, material grade, and weight. These must be verified for the specific application.

How should I verify the suitability of a luffing hinge for my crane?

Consult the legal manufacturer or supplier to confirm that the hinge's specifications match your crane's design, load requirements, and environmental conditions. Always verify model-specific values and standards.

Data Basis

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

Preliminary Technical Classification

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pressure:	Not applicable (mechanical component)
other spec:	Max angular deflection: ±15°, Max dynamic load: 50 kN, Max static load: 75 kN
temperature:	-40°C to +80°C

Luffing Hinge

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards