Eccentric Section: Diameter 20-300 mm, Length 50-500 mm

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), or ductile iron. Surface treatments include induction hardening (50-60 HRC), nitriding, or chrome plating for wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 286-2, DIN 7154, ISO 1101, DIN 7184

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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Eccentric Section

Manufacturer profiles associated with Eccentric Section.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Eccentric Section