Cylinder Liner / Motor Housing: Inner Diameter 20-500 mm

Component Specifications

Definition

A cylinder liner (in pneumatic applications) or motor housing (in electric applications) is a precision-engineered cylindrical component that serves as the primary structural enclosure. In pneumatic systems, it guides piston movement and contains compressed air; in electric motors, it houses stator windings, rotor assembly, and provides mounting interfaces while dissipating heat. It ensures proper alignment, minimizes friction, and maintains pressure/thermal integrity.

Working Principle

In pneumatic systems: The liner provides a smooth, wear-resistant surface for piston rings/seals to slide against, converting air pressure into linear motion while preventing leakage. In electric motors: The housing supports electromagnetic components, provides mechanical protection, facilitates cooling through fins or jackets, and aligns bearings for rotational motion.

Materials

Common materials include cast iron (gray or ductile), aluminum alloys (for lightweight applications), steel alloys (for high-pressure/temperature), and engineered polymers (for corrosion resistance). Specific grades: GG25 cast iron, AlSi10Mg aluminum, AISI 1045 steel.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	180-300 HB
Inner Diameter	20-500 mm
Surface Finish	Ra 0.4-1.6 μm
Wall Thickness	3-25 mm
Pressure Rating	Up to 30 bar (pneumatic)
Temperature Range	-40°C to 150°C
Concentricity Tolerance	0.02-0.1 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 1219, ISO 4401, DIN 24340, IEC 60034

Parent Products

This component is used in the following industrial products

Piston/Diaphragm (Pneumatic) or Motor (Electric)

The core driving mechanism within an actuator that converts energy (pneumatic pressure or electrical power) into linear or rotary mechanical motion.

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Engineering Analysis

Risks & Mitigation

Wear and scoring leading to leakage
Thermal expansion causing misalignment
Corrosion in humid/chemical environments
Fatigue cracking under cyclic loads

FMEA Triads

Trigger: Inadequate lubrication
Failure: Increased friction and premature wear
Mitigation: Implement automatic lubrication systems and regular maintenance schedules

Trigger: Material fatigue from pressure cycles
Failure: Crack formation and catastrophic failure
Mitigation: Use fatigue-resistant materials and design with safety factors

Trigger: Improper installation alignment
Failure: Eccentric wear and reduced efficiency
Mitigation: Use precision alignment tools and follow installation protocols

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 2768-mK for general dimensions, ISO 286 for fits

Test Method

Pressure testing per ISO 4414, dimensional inspection with CMM, hardness testing per ASTM E10

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Cylinder Liner / Motor Housing

Manufacturer profiles associated with Cylinder Liner / Motor Housing.

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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 difference between a cylinder liner and a motor housing?

Cylinder liners are used in pneumatic/hydraulic systems to guide pistons, while motor housings enclose electric motor components. Both provide structural support but differ in design for pressure containment vs. electromagnetic and thermal management.

How do I select the right material for a cylinder liner?

Consider operating pressure, temperature, wear resistance, and corrosion environment. Cast iron offers good wear resistance, aluminum reduces weight, and steel handles high pressures.

What maintenance is required for cylinder liners?

Regular inspection for wear/scoring, lubrication of inner surfaces, and checking seal integrity. Replace if wear exceeds tolerance or surface damage occurs.

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.

Cylinder Liner / Motor Housing