Draft Gear Housing

Product Specifications

Technical details and manufacturing context for Draft Gear Housing

Definition

The draft gear housing is a structural component of the railway coupler and draft gear system, serving as the protective enclosure for the draft gear mechanism. It houses energy-absorbing elements such as friction wedges, springs, or hydraulic components, and provides mounting points for attachment to the railcar underframe. The housing transfers compressive and tensile forces between the coupler and the car body while containing the draft gear components. Typically manufactured from cast steel (e.g., ZG230-450 per GB/T 11352) or forged steel, the housing must meet specified mechanical properties including minimum tensile strength of 450 MPa, yield strength of 230 MPa, elongation of 22%, and impact toughness of 27 J at -20°C. Hardness ranges from 140 to 180 HBW. Dimensional tolerances are critical for mating with the draft gear, typically ±0.5 mm per GB/T 1804, and surface roughness on sealing surfaces is Ra 6.3–12.5 μm per GB/T 1031. The housing operates within a temperature range of -40°C to 85°C and is designed for with sealing test pressure of 1.5–2.4 MPa. Corrosion resistance is verified by salt spray testing per ISO 9227 for at least 500 hours. Weight varies from 80 to 120 kg depending on coupler type. These values are directory references and must be confirmed for the specific model and application. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The draft gear housing functions as a rigid structural container that transfers forces from the coupler to the draft gear mechanism inside. During coupling impacts, compressive forces travel through the housing to the energy-absorbing elements within. The housing maintains alignment of internal components, prevents contamination from the environment, and provides structural integrity to the entire draft gear assembly. It also distributes tensile forces during normal operation, ensuring that the draft gear operates within its designed parameters.

Common Materials

Cast steel, Forged steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Material Grade	ZG230-450	Cast steel for strength and toughnessGB/T 11352
Tensile Strength	≥450 MPa	Minimum for structural integrityGB/T 11352
Yield Strength	≥230 MPa	Minimum for elastic deformation limitGB/T 11352
Elongation	≥22 %	Ductility to absorb impactGB/T 11352
Impact Toughness	≥27 J	At -20°C for low-temperature serviceGB/T 11352
Hardness	140–180 HBW	Balance wear resistance and machinabilityGB/T 11352
Operating Temperature	-40–85 °C	Below -40°C brittle fracture risk
Sealing Test Pressure	1.5–2.4 MPa	1.5 times working pressure for leak test
Dimensional Tolerance	±0.5 mm	Critical for mating with draft gearGB/T 1804
Surface Roughness	Ra 6.3–12.5 μm	Sealing surfaces require Ra 6.3GB/T 1031
Weight	80–120 kg	Depends on coupler type
Corrosion Resistance	≥500 h	Salt spray test per ISO 9227ISO 9227

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

Mounting Flange Part
Provides attachment points to secure the housing to the railcar underframe

Material: steel
Access Cover Part
Removable panel for inspection and maintenance of internal draft gear components

Material: steel
Wear Plates Part
Protective surfaces that absorb friction and impact from internal moving parts

Material: hardened steel
Outer Casing
The casting itself — it is what carries the coupler force through to the underframe.

Applied To / Applications

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

Coupler & Draft Gear

View system integration details

Manufacturers of Draft Gear Housing

Manufacturer profiles associated with Draft Gear 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 · Page last updated 6 September 2026

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Frequently Asked Questions

What materials are used for draft gear housings?

According to directory data, draft gear housings are typically made of cast steel (e.g., ZG230-450 per GB/T 11352) or forged steel. The material grade must be confirmed for the specific application.

What are the key mechanical properties?

Directory reference values include minimum tensile strength of 450 MPa, yield strength of 230 MPa, elongation of 22%, and impact toughness of 27 J at -20°C, per GB/T 11352. Hardness is 140–180 HBW. These are reference ranges; verify with the manufacturer.

How is corrosion resistance tested?

Corrosion resistance is tested via salt spray testing per ISO 9227, with a minimum duration of 500 hours. This is a verification reference, not a guarantee of performance.

What are the operating temperature and pressure limits?

The operating temperature range is -40°C to 85°C. With sealing test pressure of 1.5–2.4 MPa. Confirm these values for your specific model.

Data Basis

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

Preliminary Technical Classification

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pressure:	Up to 2 MPa (290 psi) static load
other spec:	Impact energy absorption: 35-50 kJ typical
temperature:	-40°C to +120°C

Product Specifications

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