INDUSTRY COMPONENT

Eccentric Section

An eccentric section is a cylindrical component with an off-center axis that converts rotary motion into reciprocating motion in machinery.

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Component Specifications

Definition
The eccentric section is a critical component of an eccentric shaft, characterized by a cylindrical geometry where the center of rotation is offset from the geometric center. This offset creates an eccentricity that transforms the shaft's continuous rotation into oscillating or reciprocating linear motion in connected components like connecting rods, pistons, or cams. It functions as a mechanical linkage element in various industrial applications requiring controlled periodic motion.
Working Principle
The working principle relies on the offset between the rotational axis and geometric center. As the shaft rotates, the eccentric section's off-center mass creates a circular path for any point attached to its surface. This circular motion is transmitted to connected components, converting rotational energy into linear reciprocating motion through mechanical linkage systems.
Materials
Typically forged or machined from alloy steels (AISI 4140, 4340), carbon steels (1045, 4140), or ductile iron. Surface treatments include induction hardening (50-60 HRC), nitriding, or chrome plating for wear resistance.
Technical Parameters
  • Length 50-500 mm
  • Diameter 20-300 mm
  • Hardness 45-60 HRC
  • Eccentricity 1-50 mm
  • Concentricity 0.02-0.1 mm
  • Surface Finish Ra 0.8-3.2 μm
  • Runout Tolerance 0.01-0.05 mm
Standards
ISO 286-2, DIN 7154, ISO 1101, DIN 7184

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Eccentric Section.

eccentric section eccentric shaft component reciprocating motion mechanism mechanical linkage power transmission industrial machinery parts cam mechanism Eccentric Section in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Eccentric Shaft

A rotating shaft with an offset center of mass that converts rotary motion into reciprocating motion in a jaw crusher.

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Engineering Analysis

Risks & Mitigation
  • Fatigue failure due to cyclic loading
  • Wear at bearing surfaces
  • Vibration from unbalanced masses
  • Misalignment causing premature failure
  • Thermal expansion affecting tolerances
FMEA Triads
Trigger: Insufficient surface hardness
Failure: Accelerated wear at bearing surfaces
Mitigation: Implement proper heat treatment (induction hardening to 55-60 HRC) and specify appropriate surface roughness (Ra 0.8-1.6 μm)
Trigger: Improper balancing
Failure: Excessive vibration leading to bearing failure
Mitigation: Dynamic balancing to ISO 1940 G2.5 standard and proper counterweight design
Trigger: Material defects or improper forging
Failure: Fatigue cracking under cyclic loading
Mitigation: Ultrasonic testing of raw material, proper forging practices, and magnetic particle inspection of finished components

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Geometric tolerances per ISO 1101: H7/h6 fit for bearing surfaces, runout tolerance 0.02 mm maximum, concentricity within 0.05 mm TIR
Test Method
Coordinate measuring machine (CMM) verification, surface roughness testing per ISO 4287, hardness testing per ISO 6508, dynamic balancing per ISO 1940

Buyer Feedback

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

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

"Testing the Eccentric Section 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 section?

The eccentric section converts continuous rotary motion from the shaft into controlled reciprocating or oscillating linear motion in connected mechanical components.

How does eccentricity affect machine performance?

Eccentricity determines the stroke length of reciprocating motion. Larger eccentricity creates longer strokes but increases dynamic forces and vibration, requiring careful balancing.

What maintenance is required for eccentric sections?

Regular lubrication of bearing surfaces, inspection for wear patterns, monitoring of clearance tolerances, and checking for surface fatigue or cracking in high-cycle applications.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Eccentric Mass (ERM) Eccentric Shaft