Structured Manufacturing Data (2026)

Eccentric Shaft / Crank

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Eccentric Shaft / Crank used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Eccentric Shaft / Crank is characterized by the integration of Main Bearing Journals and Crankpin/Eccentric Journal. In industrial production environments, manufacturers listed on CNFX commonly emphasize Alloy Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A mechanical component that converts rotary motion into oscillating or reciprocating motion through its offset axis of rotation.

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Product Specifications

Technical details and manufacturing context for Eccentric Shaft / Crank

Definition
Within an Oscillation Drive Unit, the eccentric shaft or crank is the core rotating element that generates controlled oscillatory movement. Its off-center design creates a variable radius during rotation, which is transmitted to connected linkages or mechanisms to produce the desired back-and-forth motion pattern essential for the unit's function.
Working Principle
The shaft rotates around its main axis, but due to its eccentric (off-center) journal or crankpin, the point of attachment for connecting rods or other linkages follows a circular path with a fixed offset. This circular motion is converted into linear or angular oscillation in the connected components, with the amplitude determined by the eccentricity distance.
Common Materials
Alloy Steel, Carbon Steel, Forged Steel
Technical Parameters
  • Eccentricity (offset distance from center axis to crankpin center) (mm) Customizable
Components / BOM

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Eccentric Shaft / Crank.

forged steel eccentric shaft for heavy machinery alloy steel crank with counterweights custom eccentric journal shaft manufacturing high-torque crankpin for industrial equipment precision machined crank shafts with keyways

Applied To / Applications

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

Oscillation Drive Unit
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 MPa (100 bar) for standard designs, higher with specialized seals
other spec: Maximum eccentricity offset: 0.1-100 mm depending on shaft diameter; Maximum rotational speed: 500-3000 RPM based on balance and bearing type; Lubrication required for continuous operation
temperature: -40°C to 150°C (dependent on bearing/seal materials)
Media Compatibility
✓ Hydraulic fluids (mineral oil, synthetic) ✓ Industrial lubricants (grease, oil bath) ✓ Clean air/gas systems
Unsuitable: Abrasive slurry environments without protective coatings or hardened surfaces
Sizing Data Required
  • Required torque/force output (N·m or kN)
  • Operating speed range (RPM)
  • Available installation space constraints (shaft diameter, overall length)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Fatigue cracking
Cause: Cyclic loading from reciprocating motion exceeding material endurance limit, often exacerbated by stress concentrations at fillets or keyways.
Bearing journal wear
Cause: Inadequate lubrication leading to metal-to-metal contact, contamination from particulates, or misalignment causing uneven load distribution.
Maintenance Indicators
  • Abnormal vibration patterns or audible knocking during operation, indicating imbalance or bearing clearance issues.
  • Visible cracks or discoloration (blueing) at stress concentration points, suggesting overheating or material fatigue.
Engineering Tips
  • Implement precision alignment during installation and regular laser alignment checks to minimize bending stresses and uneven wear.
  • Establish a robust lubrication management program with filtered oil, scheduled oil analysis, and proper lubrication intervals based on operational load cycles.

Compliance & Manufacturing Standards

Reference Standards
ISO 286-1:2010 (Geometrical product specifications - Limits and fits) ANSI B4.1-1967 (Preferred Limits and Fits for Cylindrical Parts) DIN 7190-1:2017 (Interference fits - Calculation and design rules)
Manufacturing Precision
  • Eccentricity: +/-0.01mm
  • Surface finish: Ra 0.8μm
Quality Inspection
  • Dimensional verification with CMM (Coordinate Measuring Machine)
  • Magnetic particle inspection for surface cracks

Factories Producing Eccentric Shaft / Crank

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What materials are best for eccentric shafts in high-stress applications?

Alloy steel and forged steel offer superior strength and fatigue resistance for high-stress machinery applications, with forged steel providing excellent grain flow for maximum durability.

How do counterweights improve eccentric shaft performance?

Counterweights balance the offset mass of the eccentric journal, reducing vibration, minimizing bearing wear, and improving overall system efficiency and longevity.

What maintenance is required for eccentric shafts in continuous operation?

Regular inspection of bearing journals and crankpins for wear, proper lubrication, and monitoring of alignment and balance are essential for maintaining optimal performance in continuous operation.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Machinery and Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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