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Sleeve Body Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

The sleeve body is the primary structural element of a thermal expansion sleeve assembly, designed as a hollow cylindrical component with precisely machined internal and external surfaces. It functions as the intermediary between a rotating shaft and hub, utilizing controlled thermal expansion principles to create interference fits without mechanical fasteners. During installation, the sleeve body is heated to expand its inner diameter, allowing easy mounting on the shaft; upon cooling, it contracts to create a uniform, high-pressure clamping force that transmits torque while maintaining concentricity and minimizing stress concentrations.

Working Principle

Operates on differential thermal expansion principles where controlled heating expands the sleeve body's inner diameter for installation, and subsequent cooling creates radial contraction that generates uniform interference fit pressure between shaft and hub surfaces, enabling torque transmission through frictional forces without keyways or splines.

Materials

High-strength alloy steel (typically 42CrMo4, 34CrNiMo6, or similar grades) with yield strength ≥ 800 MPa, heat-treated to HRC 28-32 hardness, featuring homogeneous microstructure for consistent thermal expansion coefficients and fatigue resistance.

Technical Parameters

Diameter Range 20-500 mm
Surface Roughness Ra ≤ 0.8 μm
Concentricity Tolerance ≤ 0.01 mm
Length-to-Diameter Ratio 0.8-2.5
Interference Fit Pressure 100-250 MPa
Operating Temperature Range -40°C to +200°C
Thermal Expansion Coefficient 11.5-13.5 × 10⁻⁶/K

Standards

ISO 286-2, DIN 7190, ISO 10791-7

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Sleeve Body.

Parent Products

This component is used in the following industrial products

Thermal Expansion Sleeve

A cylindrical component designed to accommodate thermal expansion in roller assemblies during high-temperature processes.

View Product Details

Engineering Analysis

Risks & Mitigation

Thermal stress cracking during rapid heating/cooling
Gallling from improper surface finish
Fatigue failure from cyclic loading
Corrosion in aggressive environments
Installation errors from incorrect temperature control

FMEA Triads

Trigger: Excessive heating rate during installation
Failure: Thermal stress cracks developing in sleeve wall
Mitigation: Implement controlled heating protocols with maximum 100°C/hour rate and uniform temperature distribution monitoring

Trigger: Insufficient surface finish quality
Failure: Reduced friction coefficient leading to slippage under load
Mitigation: Maintain Ra ≤ 0.8 μm surface roughness with proper machining and finishing processes

Trigger: Material inhomogeneity
Failure: Uneven thermal expansion causing eccentric clamping forces
Mitigation: Implement material certification with microstructure analysis and thermal expansion coefficient verification

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

IT6/IT7 grade per ISO 286-2 for bore and outer diameters, concentricity within 0.01 mm TIR

Test Method

Hydraulic pressure testing for integrity, thermal cycling validation, torque transmission testing per DIN 7190, non-destructive testing (MPI/UT) for material defects

Buyer Feedback

★★★★☆ 4.5 / 5.0 (32 reviews)

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

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

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

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Frequently Asked Questions

How does the sleeve body create a secure connection without mechanical fasteners?

Through controlled thermal expansion: heating expands the sleeve for installation, cooling creates radial contraction that generates uniform pressure between shaft and hub, transmitting torque via friction without stress concentrations from keyways.

What maintenance is required for sleeve body components?

Minimal maintenance beyond periodic inspection for surface damage or corrosion. Removal requires reheating to expand the sleeve, eliminating mechanical wear from repeated disassembly/assembly cycles.

Can sleeve bodies be reused after disassembly?

Yes, when properly heated for removal and reinstalled following manufacturer specifications, sleeve bodies maintain dimensional stability and can typically be reused multiple times without performance degradation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Sleeve Body