Eccentric Sleeve: Bore Diameter (ID) 10-100 mm

Component Specifications

Definition

An eccentric sleeve is a precision-engineered cylindrical component featuring a bore that is intentionally offset from its outer diameter's geometric center. This offset creates an eccentricity that, when rotated, converts rotary motion into reciprocating or oscillating motion. It is a critical element in eccentric assemblies, where it typically mounts on a shaft and interfaces with other components like bearings, connecting rods, or cams to transmit motion with specific displacement characteristics.

Working Principle

The working principle relies on the offset between the inner bore (mounting surface) and the outer cylindrical surface. When the sleeve rotates with a shaft (or the shaft rotates within it), the outer surface follows an orbital path. This eccentric motion is transferred to any component attached to or in contact with the outer surface, generating linear or oscillating movement proportional to the eccentricity distance (throw). It essentially acts as a simple cam.

Materials

Typically manufactured from alloy steels (e.g., AISI 4140, 4340), carbon steels, or sometimes stainless steel for corrosion resistance. Common treatments include case hardening (carburizing, nitriding) or through-hardening and tempering to achieve surface hardness of 55-62 HRC and a tough core. Cast iron or bronze may be used in specific low-load applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	30-150 mm
Hardness	55-62 HRC (surface)
Runout Tolerance	≤ 0.01 mm
Bore Diameter (ID)	10-100 mm
Outer Diameter (OD)	20-200 mm (common range)
Surface Finish (Ra)	0.4-1.6 μm
Eccentricity (Throw)	0.5-25 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

Parent Products

This component is used in the following industrial products

Eccentric Assembly

The eccentric assembly is a critical rotating component in a cone crusher that converts the rotational motion from the drive system into the gyratory crushing motion.

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Engineering Analysis

Risks & Mitigation

Fatigue failure due to cyclic loading
Wear and fretting at bore/shaft interface
Misalignment causing vibration and premature bearing failure
Incorrect eccentricity leading to machine malfunction

FMEA Triads

Trigger: Improper heat treatment or material defects
Failure: Cracking or fracture under load
Mitigation: Implement strict material certification and process controls for hardening; use non-destructive testing (e.g., magnetic particle inspection).

Trigger: Insufficient lubrication or contamination
Failure: Accelerated wear and seizure on bearing surfaces
Mitigation: Design with proper lubrication channels; use sealed environments or high-quality lubricants; specify appropriate surface finishes.

Trigger: Installation misalignment or excessive clearance
Failure: Vibration, noise, and reduced component life
Mitigation: Use precision machining with tight tolerances; follow mounting procedures with alignment checks; employ locking mechanisms (e.g., set screws, keyways).

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 1101 (e.g., concentricity, cylindricity). Dimensional tolerances typically ISO 286-2 fine grade (e.g., IT6-IT7 for bore/shaft fit).

Test Method

Dimensional checks with CMM or micrometers; hardness testing (Rockwell C); runout measurement with dial indicators; non-destructive testing for defects; functional testing in assembly under load.

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 Sleeve

Manufacturer profiles associated with Eccentric Sleeve.

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Frequently Asked Questions

What is the primary function of an eccentric sleeve?

Its primary function is to convert rotary motion into controlled linear or oscillating reciprocating motion by utilizing its offset bore to create eccentric movement.

How is eccentricity measured in an eccentric sleeve?

Eccentricity is measured as the radial distance between the center of the outer diameter and the center of the inner bore. It is often called the 'throw' and determines the amplitude of the resulting motion.

Can eccentric sleeves be adjusted for different throws?

Standard eccentric sleeves have a fixed throw. However, adjustable eccentric mechanisms exist using multiple sleeves or slotted designs, but these are more complex and less common than fixed types.

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 Sleeve