Advantages of high compatibility die-casting material
Using ADC12/AlSi9Cu3 die-casting aluminum alloy (custom material grades can be specified as needed), it possesses three core characteristics:
Lightweighting enhancement
The density is only 1/3 of cast iron, compared to traditional cast iron gearbox housings, it reduces weight by 35%-42%, directly contributing to a 5%-8% improvement in vehicle fuel economy;
Mechanical strength
After T6 heat treatment, the tensile strength is ≥ 220 MPa and the Brinell hardness is ≥ 80 HB, capable of stably bearing the input torque load within 450 N・m during the gearbox operation;
Environmental adaptability
It has excellent resistance to oil corrosion (suitable for ATF gearbox oil long-term immersion) and temperature stability, capable of adapting to extreme working conditions ranging from -40℃ to 150℃.
Advantages of High-Precision Die Casting Process
Relying on our factory's automated high-pressure die casting production line, we achieve precise matching of process and structure:
High-pressure die casting
Using 1250T-2500T die casting machines, the die-casting pressure is controlled at 80-120 MPa, ensuring the complete filling of complex cavities (gear cavities, oil passage channels, bearing installation positions), with a forming yield of over 98.5%;
Precise dimension control
The mold accuracy reaches IT7 level, and the product size tolerance complies with GB/T 1804-m standard. The coaxiality of key installation holes is ≤ 0.05mm, ensuring precise assembly with the internal gears and shaft systems of the transmission;
Surface and post-treatment
After forming, the parts undergo sandblasting / chemical passivation treatment, with surface roughness Ra ≤ 1.6 μm. At the same time, customized surface protection processes such as anodizing and electrophoresis can be provided as per demand, enhancing corrosion resistance.
High Reliability Performance Advantage
Tailored optimization for transmission operating conditions:
Ultra-seal performance
The flatness of the joint surface of the housing is ≤ 0.02mm/100mm. The dedicated sealing groove design ensures that the leakage is ≤ 10Pa·m³/s under a 100kPa air pressure test, ensuring no leakage of transmission oil;
Efficient heat dissipation assistance
The aluminum alloy material has a thermal conductivity of 110W/(m·K). Combined with the external heat dissipation ribs (integrated as needed) design, it can accelerate the heat dissipation inside the transmission and reduce the temperature fluctuation of the oil;
Impact resistance and durability
After 100,000 cycles of load impact tests, the housing shows no failure such as cracks or deformations, meeting the usage requirements of the vehicle throughout its entire life cycle (≥ 300,000 kilometers).
| Parameter item | Technical indicator |
| Material grade | ADC12 / AlSi9Cu3 (customizable) |
| Product weight | 2.5kg - 4.2kg (adjusted according to transmission model) |
| Size tolerance | GB/T 1804-m grade |
| Surface roughness | Ra ≤ 1.6μm |
| Operating temperature range | -40℃ ~ 150℃ |
| Air tightness requirement | ≤ 10Pa・m³/s (100kPa pressure test) |
| Maximum compatible input torque | ≤ 450N·m |
| Salt spray corrosion test | ≥ 500h (neutral salt spray, no red rust) |
Application Scenarios of the Transmission Housing
In the passenger vehicle sector
Suitable for manual transmission (MT), automatic transmission (AT), and dual-clutch transmission (DCT) assemblies of sedan, SUV;
In the commercial vehicle sector
Suitable for mechanical automatic transmission (AMT) assemblies of light trucks, pickup trucks, etc.;
In the new energy sector
Suitable for power coupling transmission cases of hybrid vehicles (HEV/PHEV).
The full-process quality control system
Our factory has obtained the IATF16949 automotive industry quality system certification. The product's entire cycle control covers:
Incoming material inspection
spectral analysis of raw material components, mechanical performance testing of furnace samples;
Process control
real-time monitoring of die-casting parameters (temperature, pressure, injection speed), full-size inspection of the first piece using three-coordinate measurement, process inspection for each batch;
Finished product inspection
special tests for air tightness, X-ray non-destructive testing (in key areas), full-size inspection of dimensions, sampling verification for salt spray corrosion.
Customized Service Support
On-demand Development
Support for optimizing the shell structure, designing molds, and adapting processes based on the customer's 3D drawings/technical requirements for the gearbox;
Mold Support
Provide independent mold development, maintenance, and upgrade services to ensure the stability of mass production;
After-sales Response
24-hour technical connection, full-process quality traceability for batch orders, and rapid replacement of defective products to ensure quality.
FAQ
Q: What are the advantages of aluminum alloy shells over cast iron?
A: Lightweight (weight reduction by 35%-42%), strong heat dissipation (thermal conductivity is 3 times that of cast iron), easy to form complex structures, resistant to gearbox oil corrosion.
Q: Can it be adapted for high-power vehicles?
A: The regular model can handle ≤ 450N・m (covering most passenger / commercial vehicles), for higher torque, custom materials can be used, with an upper limit of 600N・m.
Q: How to ensure accuracy and sealing?
A: IT7 grade molds + high-pressure die casting, key holes concentricity ≤ 0.05mm; the finished product undergoes a 100kPa air pressure test, leakage volume ≤ 10Pa・m³/s.
Q: Is there quality assurance?
A: Certified by IATF16949, full process inspection (raw materials, dimensions, flaw detection, etc.), each batch comes with a traceability report.
Q: Can it be customized? How long does the development cycle take?
A: Customizable according to drawings, process: mold design (7-10 days) → manufacturing (25-30 days) → sample (5-7 days), total cycle 40-45 days.
Q: Can the mold be modified?
A: Minor adjustments can be completed within 7-10 days, major modifications can be negotiated, and the product can be iterated simultaneously.
Q: Delivery time and minimum order quantity?
A: Batch (≥500 pieces) delivery time 15-20 days, minimum order quantity 200-300 pieces, samples delivered within 7-10 days.
Q: How are defective products handled?
A: 24-hour response, our issues will be reissued with qualified products within 72 hours, long-term customers can reserve spare parts.
Ningbo Zhouchi Vehicle Industry Co., Ltd. was founded in 1992, located in Binhai Industrial Park of the beautiful coastal port city -Ningbo. Now our company covers the total area of 16000 square meters, with 150 staffs, including 20 quality inspectors and engineers. Our turnover is around12 Millions USD. Our company specializes in Aluminum Die-casting and Zinc Die-casting, CNC machining and assembling.
Quality Assurance
We have 100% quality guarantee to customers. We will be responsible for any quality problem.
Competitive Prices
We offer ODM service for customer with good quality and reasonable price.
12MLN
Estimated Turnover
150+
Professional Staff
100+
Annual Production of Molds
70%
For Export
our certifications
ISO 14001:2015
The ISO 14001:2015 certificate is an internationally recognized document that indicates that an organization has established, implemented, maintained, and continuously improved an environmental management system (EMS) that complies with the requirements of ISO 14001:2015.
This certificate certifies that the environmental management system of this organization has met international standards, enabling it to systematically manage its environmental responsibilities and commit to sustainable development.
IATF16949:2016
IATF 16949:2016 is an international standard for quality management systems in the automotive industry. It was developed by the International Automotive Task Force (IATF) and was released in October 2016, replacing the previous version of ISO/TS 16949:2009.
The core objective of IATF 16949 is to continuously improve, prevent defects, reduce variations and waste in the automotive supply chain. It aims to ensure that the design and manufacturing of automotive products (including components and materials) can always meet customer requirements and even exceed customer expectations.
our Partners
Our company has established long-term friendly and cooperative partnerships with Suzuki China factory, Peugeot China factory, Schneider Electric and other foreign and domestic well-known enterprises.
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