INDUSTRY COMPONENT

Eccentric Shaft

A rotating shaft with offset centerline used to convert rotary motion into reciprocating motion in oscillation mechanisms.

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Component Specifications

Definition
An eccentric shaft is a mechanical component featuring a cylindrical journal whose geometric center is deliberately offset from the shaft's rotational axis. This design creates an eccentricity (throw) that transforms continuous rotary input into controlled linear or oscillatory output motion when integrated into mechanisms like linkages, cams, or cranks. It is fundamental in applications requiring precise periodic displacement, such as vibrating screens, compactors, and certain types of pumps or engines.
Working Principle
The working principle relies on the offset between the shaft's rotational center and the eccentric journal's center. As the shaft rotates, this offset causes the journal to trace a circular path, imparting a reciprocating or oscillating motion to any component (e.g., a connecting rod or bearing) mounted on it. The amplitude of oscillation is determined by the eccentricity distance (throw), while frequency is controlled by rotational speed.
Materials
Typically manufactured from high-strength alloy steels (e.g., AISI 4140, 4340) or carbon steels, often heat-treated (quenched and tempered) to achieve surface hardness of 45-55 HRC and core toughness. Corrosion-resistant coatings or stainless steels (e.g., 17-4 PH) may be used in harsh environments.
Technical Parameters
  • Length 100-1000 mm
  • Hardness 45-55 HRC
  • Shaft Diameter 20-150 mm
  • Surface Finish Ra 0.8-1.6 μm
  • Runout Tolerance ≤ 0.05 mm
  • Eccentricity (Throw) 5-50 mm
  • Dynamic Load Capacity 10-200 kN
Standards
ISO 286-2, DIN 748-3, ISO 1101

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Eccentric Shaft.

eccentric shaft oscillation mechanism reciprocating motion mechanical component power transmission vibrating equipment shaft design Eccentric Shaft in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Oscillation Mechanism

A mechanical component that generates controlled periodic back-and-forth motion within an industrial system.

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Primary Crusher

The first-stage crushing equipment in a slag processing system that reduces large slag chunks to smaller, manageable sizes.

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Jaw Crusher

A primary crushing machine that reduces large rocks into smaller particles using compressive force between two jaw plates.

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Engineering Analysis

Risks & Mitigation
  • Fatigue cracking due to cyclic loading
  • Bearing seizure from inadequate lubrication
  • Imbalance causing excessive vibration
  • Misalignment leading to premature wear
FMEA Triads
Trigger: Cyclic stress exceeding material endurance limit
Failure: Fatigue fracture at the eccentric journal fillet
Mitigation: Implement finite element analysis (FEA) during design, use shot peening to induce compressive residual stresses, and specify regular non-destructive testing (NDT).
Trigger: Contaminated or insufficient lubrication
Failure: Bearing seizure on the eccentric journal, causing shaft scoring and overheating
Mitigation: Use sealed bearings or automatic lubrication systems, establish preventive maintenance schedules, and monitor oil quality.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Geometric tolerances per ISO 1101:2017, with eccentricity tolerance typically ±0.1 mm and runout ≤ 0.05 mm.
Test Method
Dimensional inspection via CMM, hardness testing per ISO 6508, dynamic balancing to ISO 1940-1 G6.3 grade, and NDT (ultrasonic or magnetic particle) for crack detection.

Buyer Feedback

★★★★☆ 4.7 / 5.0 (32 reviews)

"The technical documentation for this Eccentric Shaft is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Eccentric Shaft so far."

"Testing the Eccentric Shaft now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the primary function of an eccentric shaft?

To convert continuous rotary motion into controlled linear or oscillatory motion through an offset journal design.

How is eccentricity measured and specified?

Eccentricity (throw) is the radial distance between the shaft's rotational axis and the eccentric journal's center, typically specified in millimeters.

What maintenance is required for eccentric shafts?

Regular lubrication of bearings, monitoring for wear or imbalance, and checking alignment and fastening to prevent fatigue failure.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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