Center Housing for Turbocharger CHRA | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Center Housing

Definition

The Center Housing is the core structural element within the Center Housing Rotating Assembly (CHRA) of a turbocharger. It serves as the main housing that contains and supports the turbine shaft, bearings, and compressor wheel assembly. This component provides critical mounting surfaces for both the turbine and compressor housings, maintains proper alignment of rotating parts, and contains lubrication and cooling passages for the bearing system. Its design directly impacts turbocharger durability, thermal management, and overall performance.

In motor vehicle manufacturing, the Center Housing is typically made from cast iron or aluminum alloy, chosen for strength, heat resistance, and weight considerations. The housing must withstand high operating temperatures (up to 760–1050 °C) and pressures (1.0–1.6 MPa) while maintaining dimensional stability. Key parameters include bearing bore diameter (12–25 mm), turbine wheel diameter (40–90 mm), compressor wheel diameter (35–80 mm), and bearing journal diameter (8–16 mm), with tight tolerances (e.g., ±0.005 mm for journal, ±0.01 mm for bore) to ensure rotor balance and bearing fit. Material grades such as GGG40–GGG70 (ductile iron) are referenced per DIN 1693, and the housing weight typically ranges from 1.5 to 4.5 kg.

For procurement, verify that the Center Housing meets the required dimensional tolerances (ISO 286) and material specifications for the specific turbocharger model. Confirm the maximum operating temperature and pressure ratings with the manufacturer, as these affect material selection and durability. The housing's design must align with the turbine and compressor housings, and its lubrication and cooling passages must be compatible with the engine's oil system. Always consult the legal manufacturer or supplier for model-specific values and standards, as the ranges provided are general references.

Working Principle

The Center Housing functions as a stationary structural platform that supports the high-speed rotating assembly (turbine shaft, compressor wheel, and bearings) within the turbocharger. It transfers loads from rotating components to the engine mounting, maintains precise alignment through bearing journals, and facilitates heat dissipation from hot turbine gases via integrated cooling passages. Lubrication channels within the housing deliver oil to bearings under pressure while drain passages return oil to the engine sump.

Common Materials

Cast Iron, Aluminum Alloy

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bearing Bore Diameter	12–25 mm	Determines bearing selection and rotor stabilityISO 286
Turbine Wheel Diameter	40–90 mm	Affects flow capacity and efficiency
Compressor Wheel Diameter	35–80 mm	Matches turbine size for performance
Bearing Journal Diameter	8–16 mm	Critical for oil film thickness and stabilityISO 286
Bearing Journal Tolerance	±0.005 mm	Tighter tolerance improves rotor balanceISO 286
Bearing Bore Tolerance	±0.01 mm	Ensures proper bearing fitISO 286
Maximum Operating Temperature	760–1050 °C	Material limits; above causes creep
Material Grade	GGG40–GGG70	Ductile iron for strength and heat resistanceDIN 1693
Weight	1.5–4.5 kg	Affects overall turbocharger weight

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

Components / BOM

Housing Body
The housing itself: encloses and locates the internal parts and provides the mounting interface.
Bearing Journals Part
Precision-machined surfaces that support and align the turbine shaft bearings

Material: Cast Iron or Aluminum Alloy
Cooling Water Passages Part
Integrated channels for coolant flow to manage heat from turbine section

Material: Same as housing material
Mounting Flanges Part
Machined surfaces with bolt patterns for attaching turbine and compressor housings

Material: Same as housing material

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Center Housing.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Center Housing Rotating Assembly (CHRA)

View system integration details

Manufacturers of Center Housing

Manufacturer profiles associated with Center Housing.

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Frequently Asked Questions

What materials are commonly used for the Center Housing?

According to the directory, the Center Housing is typically made from cast iron or aluminum alloy. Material grades such as GGG40–GGG70 (ductile iron) are referenced per DIN 1693. The choice depends on strength, heat resistance, and weight requirements.

What are the key dimensional parameters to verify?

Key parameters include bearing bore diameter (12–25 mm), turbine wheel diameter (40–90 mm), compressor wheel diameter (35–80 mm), and bearing journal diameter (8–16 mm). Tolerances are critical: bearing journal tolerance is ±0.005 mm, and bearing bore tolerance is ±0.01 mm, per ISO 286.

How does the Center Housing affect turbocharger performance?

The housing maintains alignment of rotating parts, supports the shaft and bearings, and contains cooling and lubrication passages. Its design impacts durability, thermal management, and overall performance. Proper bearing fit and rotor balance are essential.

What operating limits should be considered?

The maximum operating temperature is 760–1050 °C, and maximum operating pressure is 1.0–1.6 MPa. These limits affect material selection and durability. Always confirm these values with the manufacturer for your specific application.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 5 bar (absolute)
flow rate:	Dependent on turbocharger size, typically 0.05-2.0 kg/s
temperature:	-40°C to 400°C
slurry concentration:	Not applicable (clean gas/dry air only)

Center Housing

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards