Sheave (Pulley) for Jib Tip Assembly - Specifications & Verification

Product Specifications

Technical details and manufacturing context for Sheave (Pulley)

Definition

A sheave (pulley) is a critical component within the Jib Tip Sheave Assembly of cranes and lifting equipment. It serves as the rotating wheel with a grooved rim that guides the wire rope, changing its direction while minimizing friction and wear during lifting operations. In the jib tip assembly, sheaves are positioned at the end of the crane's jib to support the hoist rope that carries the load. The sheave's groove profile must match the rope diameter to ensure proper seating and to prevent rope damage. The pitch diameter, which is typically 10–15% larger than the rope diameter, determines the rope bending fatigue life. Sheaves are manufactured from cast steel, forged steel, or ductile iron, with material grades such as ZG270-500 for cast steel. Key parameters include rated load capacity (1–50 t), rope diameter (6–60 mm), groove diameter (8–70 mm), pitch diameter (100–2000 mm), operating temperature (-40 to 85 °C), surface hardness (40–55 HRC), tolerance grade (IT7–IT9), maximum rotational speed (500–3000 rpm), and weight (2–500 kg). These values are reference ranges and must be confirmed for the specific model and application. The sheave rotates on a bearing or bushing, reducing friction and wear. Standards such as ISO 4301-1, ISO 4309, ISO 18265, and ISO 286-1 are referenced for verification. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The sheave rotates on a bearing or bushing as wire rope passes through its groove. This rotation reduces friction between the stationary rope and the moving component, allowing efficient force transmission while preventing rope damage. In the jib tip assembly, sheaves redirect the rope from horizontal travel along the jib to vertical lifting of the load. The groove profile and diameter must match the rope to ensure proper seating and minimize wear. The pitch diameter influences rope bending fatigue life. The sheave's material and surface hardness affect wear resistance. Operating within specified temperature and speed ranges is essential to maintain material properties and bearing life. Regular inspection for groove wear, cracks, and bearing condition is necessary to ensure safe operation.

Common Materials

Cast steel, Forged steel, Ductile iron

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Load Capacity	1–50 t	Maximum working load limit for the pulley.ISO 4301-1
Rope Diameter	6–60 mm	Must match groove profile for proper seating.ISO 4309
Groove Diameter	8–70 mm	Typically 10–15% larger than rope diameter.ISO 4309
Pitch Diameter	100–2000 mm	Determines rope bending fatigue life.ISO 4301-1
Operating Temperature	-40–85 °C	Outside this range, material properties degrade.
Surface Hardness	40–55 HRC	Higher hardness improves wear resistance.ISO 18265
Tolerance Grade	IT7–IT9	Precision of bore and groove dimensions.ISO 286-1
Max Rotational Speed	500–3000 rpm	Limited by dynamic balance and bearing life.
Weight	2–500 kg	Affects handling and system inertia.
Material Grade	ZG270-500	Cast steel for high strength and toughness.GB/T 11352

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

Sheave body Part
Main structural component with grooved rim for rope guidance

Material: steel
Bearing/bushing Part
Allows rotation of sheave around shaft with minimal friction

Material: bronze or roller bearing steel
Groove liner Optional Part
Optional wear-resistant insert to protect both sheave and rope

Material: polyurethane or nylon

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Sheave (Pulley).

Applied To / Applications

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

Jib Tip Sheave Assembly

View system integration details

Luffing Rope/Sheaves

View system integration details

Manufacturers of Sheave (Pulley)

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

BVEE Group

Shanghai, CN

Also makes: Ship-to-Shore Crane, Spreader, Bulk Material Handler and 8 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the function of a sheave in a jib tip assembly?

The sheave guides and supports the wire rope, changing its direction from horizontal to vertical while minimizing friction and wear during lifting operations.

What materials are commonly used for sheaves?

Common materials include cast steel, forged steel, and ductile iron. Material grades such as ZG270-500 are referenced for cast steel.

How do I select the correct sheave for my application?

Selection depends on rope diameter, required load capacity, pitch diameter, and operating conditions. Verify all parameters with the manufacturer for your specific model.

What maintenance is required for sheaves?

Regularly inspect the groove for wear, check for cracks, and ensure bearings are lubricated. Replace if groove wear exceeds limits or if damage is detected.

Data Basis

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

Preliminary Technical Classification

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pressure:	N/A (mechanical component, not pressure vessel)
other spec:	Max rope tension: 10-500 kN depending on size/design, Max rotational speed: 100-2000 RPM depending on diameter/balance
temperature:	-40°C to 120°C (standard steel), -40°C to 80°C (polymer)

Sheave (Pulley)

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards