Industry-Verified Manufacturing Data (2026)

Differential Case

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Differential Case used in the Motor Vehicle Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Differential Case is characterized by the integration of Bearing Journals and Ring Gear Flange. In industrial production environments, manufacturers listed on CNFX commonly emphasize Cast Iron construction to support stable, high-cycle operation across diverse manufacturing scenarios.

The housing that encloses and protects the differential gears and components within a front differential assembly.

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Product Specifications

Technical details and manufacturing context for Differential Case

Definition
The differential case is a critical structural component of the front differential that serves as the protective housing for the differential gears, pinions, and other internal components. It provides mounting points for bearings, seals the lubricant within the differential, and transfers torque from the ring gear to the axle shafts while withstanding significant mechanical stresses and thermal loads.
Working Principle
The differential case rotates with the ring gear, transmitting torque to the differential gears housed inside. It maintains proper alignment of the internal components, contains lubricating oil to reduce friction and wear, and provides structural integrity to withstand the torsional forces generated during vehicle operation, especially during cornering when differential action occurs.
Common Materials
Cast Iron, Aluminum Alloy, Forged Steel
Technical Parameters
  • Overall dimensions including diameter, length, and mounting flange specifications (mm) Customizable
Components / BOM
  • Bearing Journals
    Provide mounting surfaces for differential bearings to support rotation
    Material: Hardened Steel
  • Ring Gear Flange
    Mounting surface for attaching the ring gear to transfer torque
    Material: Cast Iron or Forged Steel
  • Axle Shaft Openings
    Allow passage of axle shafts into the differential assembly
    Material: Same as main case material
  • Filler/Drain Plug Bosses
    Provide threaded openings for lubricant filling and draining
    Material: Same as main case material
Engineering Reasoning
0-150°C temperature, 0-3000 rpm rotational speed, 0-500 N·m torque
Material yield strength exceeded at 350 MPa stress, fatigue failure at 10^7 cycles at 250 MPa alternating stress, thermal distortion beyond 0.5 mm at 200°C
Design Rationale: High-cycle fatigue from cyclic torsional loading exceeding S-N curve endurance limit, thermal expansion mismatch between aluminum housing (23.1×10^-6/°C) and steel components (11.8×10^-6/°C) causing stress concentration
Risk Mitigation (FMEA)
Trigger Insufficient lubrication causing boundary lubrication regime with coefficient of friction >0.15
Mode: Scoring and adhesive wear on gear contact surfaces leading to 0.1 mm material loss
Strategy: Forced lubrication system with 2.5 bar minimum pressure and 80 μm filtration
Trigger Bolt preload relaxation below 70% of initial 120 N·m torque due to vibration-induced loosening
Mode: Housing flange separation creating 0.2 mm gap allowing lubricant leakage at 0.5 L/hour
Strategy: Nord-Lock washers with 30° wedge angle maintaining clamp load through vibration to 50 g RMS

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Differential Case.

Diff Housing Differential Carrier front differential case housing cast iron differential case aluminum alloy differential housing forged steel differential case differential case with ring gear flange

Applied To / Applications

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

Front Differential
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Rear Differential
View system integration details

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 3 bar internal, 0 to 10 bar external (housing pressure rating)
other spec: Max torque capacity: 500-5000 Nm (model dependent), Lubricant viscosity range: SAE 75W-90 to SAE 85W-140
temperature: -40°C to 150°C (operating), -50°C to 180°C (peak)
Media Compatibility
✓ Automotive gear oil (synthetic/mineral) ✓ Hypoid gear lubricants ✓ Limited-slip differential fluids
Unsuitable: Saltwater immersion or high-chloride environments (causes galvanic corrosion with aluminum housings)
Sizing Data Required
  • Vehicle axle load rating (kN)
  • Maximum input torque (Nm)
  • Differential gearset type (open/limited-slip/locking)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Gear tooth pitting and spalling
Cause: Inadequate lubrication leading to metal-to-metal contact, excessive torque loads beyond design limits, or contamination in lubricant causing abrasive wear
Bearing raceway brinelling and fatigue
Cause: Shock loading from sudden acceleration/deceleration, improper bearing preload during assembly, or misalignment causing uneven load distribution
Maintenance Indicators
  • Unusual whining or grinding noises during cornering or acceleration
  • Visible lubricant leaks around differential seals or housing with metallic particles in fluid
Engineering Tips
  • Implement strict lubrication management with synthetic gear oils meeting OEM specifications and regular fluid analysis to detect early wear metals
  • Establish torque monitoring protocols for driven equipment and install vibration sensors to detect abnormal loading patterns before catastrophic failure

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 Quality Management Systems ASTM A536 Standard Specification for Ductile Iron Castings DIN 3990 Calculation of Load Capacity of Cylindrical Gears
Manufacturing Precision
  • Bore Diameter: +/-0.025mm
  • Gear Tooth Profile: AGMA Quality 10 (ISO 1328-1 Class 7)
Quality Inspection
  • Magnetic Particle Inspection for Surface Defects
  • Coordinate Measuring Machine (CMM) Verification of Critical Dimensions

Factories Producing Differential Case

Verified manufacturers with capability to produce this product in China

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✓ 93% Supplier Capability Match Found

T Technical Director from Germany Feb 11, 2026
★★★★★
"The Differential Case we sourced perfectly fits our Motor Vehicle Manufacturing production line requirements."
Technical Specifications Verified
P Project Engineer from Brazil Feb 08, 2026
★★★★☆
"Found 38+ suppliers for Differential Case on CNFX, but this spec remains the most cost-effective. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
S Sourcing Manager from Canada Feb 05, 2026
★★★★★
"The technical documentation for this Differential Case is very thorough, especially regarding technical reliability."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

12 sourcing managers are analyzing this specification now. Last inquiry for Differential Case from Mexico (1h ago).

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Frequently Asked Questions

What materials are commonly used for differential cases in motor vehicle manufacturing?

Differential cases are typically manufactured from cast iron for durability, aluminum alloy for weight reduction, or forged steel for high-strength applications in demanding vehicle environments.

What are the key components included in a differential case BOM?

A standard differential case bill of materials includes axle shaft openings, bearing journals, filler/drain plug bosses, and a ring gear flange to accommodate the complete differential assembly.

What is the primary function of a differential case in a vehicle?

The differential case serves as the protective housing that encloses and safeguards the differential gears and components within a front differential assembly, ensuring proper power distribution to the wheels.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Motor Vehicle Manufacturing sector.

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