High-Precision Reversing Gearbox Housing for Locomotives

IThe reversing and transfer gearbox serves as a very important component within a locomotive’s mechanical transmission system. As the main structural support for gears, shafts, bearings, as well as the lubrication system, the Reversing Gearbox Housing plays a decisive role in maintaining stable torque transmission, enabling reliable direction changes between forward and reverse, and ensuring long-term operational safety.

Our Reversing Gearbox Housing units are manufactured from high-strength ductile iron or cast steel, and they undergo stringent machining and inspection processes to satisfy the rigorous requirements of modern railway applications.

1.Technical Features of the Reversing Gearbox Housing

The Reversing Gearbox Housing exhibits high structural strength and excellent fatigue resistance. For instance, it utilizes high-grade ductile iron such as QT450-10 or QT500-7, which provides excellent tensile and yield strength along with good impact resistance. Additionally, the material offers high vibration damping capacity and maintains stable mechanical performance even under heavy alternating loads. Moreover, through optimized rib structures and reinforced bearing seats, the housing guarantees extended service life in demanding operating environments.

Furthermore, precision machining is essential for maintaining accurate gear alignment. In fact, the dimensional accuracy of the Reversing Gearbox Housing directly influences gear meshing quality and noise levels. Accordingly, we employ CNC milling and boring, multi-surface positioning, and precise bearing seat machining with tight tolerance control, typically within ±0.02–0.05 mm. As a result, this ensures correct alignment of gears and shafts, which reduces vibration and minimizes transmission losses.

Another important feature is the reliable sealing and lubrication protection integrated into the design. Since a reversing gearbox requires consistent lubrication for safe long-term operation, the Reversing Gearbox Housing incorporates a labyrinth sealing structure along with standard oil-seal grooves. At the same time, internal oil passages and smoothly finished casting surfaces promote efficient oil return flow. Therefore, this design prevents oil leakage and contamination, contributing to consistent and reliable performance.

2.Function of the Reversing Gearbox Housing

The Reversing Gearbox Housing fulfills several core functions within the locomotive transmission system. Firstly, it carries and protects the internal gear sets and bearings.

Secondly, it maintains precise alignment among all rotating components.

In addition, the housing supports the reversing function, which allows the locomotive to switch between forward and reverse output. It also transfers power from the engine to the axle system via matching gears.

Finally, the housing ensures reliable vibration resistance during high-load and long-term operations. In summary, the Reversing Gearbox Housing acts as the structural backbone of the locomotive’s mechanical transmission.

3.Manufacturing Process of reversing gearbox housing

We produce high-quality Reversing Gearbox Housing castings using advanced manufacturing techniques. To begin with, we employ casting technologies such as V-Process vacuum molding and resin sand casting, supplemented by special heat treatments to guarantee uniform hardness and dimensional stability. Consequently, the casting process delivers low porosity, a sound internal structure, high surface quality, and strong mechanical properties.

Subsequently, machining is performed on CNC machining centers, where boring and milling of mating surfaces are carried out with high precision. Following this, each housing undergoes coordinate measurement and a full dimensional accuracy check.

Finally, inspection includes MT/UT nondestructive testing, roughness and hardness measurements, and strength tests. Importantly, final dimensional inspection is conducted using a CMM. As a result, every Reversing Gearbox Housing is delivered with verified performance and fully traceable quality documentation.

4. Typical Material Properties (Example: QT450-10)

Property	Value
Tensile Strength	≥ 450 MPa
Yield Strength	≥ 310 MPa
Elongation	≥ 10%
Hardness	160–210 HB
Impact Toughness	High impact resistance, suitable for applications with shock and vibration loads

(Values may vary depending on customer specifications.)

5.Packaging and Delivery

Each Reversing Gearbox Housing is packaged thoroughly to ensure safe transit. Specifically, we apply anti-rust oil and protective plastic film before placing the housing in a custom wooden case with shock-proof padding. This packaging approach guarantees corrosion protection and safe long-distance shipping

Company Profile

Luoyang Fonyo Heavy Industries Co., Ltd., founded in 1998, covers an area of 72,600㎡ and employs over 300 staff, including 32 skilled technicians—5 senior engineers, 11 assistant engineers, and 16 technicians. Our company has been recognized multiple times as the Luoyang Engineering Technology Center, Luoyang Technology R&D Center, and a National High-tech Enterprise.

With an annual production capacity of 30,000 tons, we specialize in design, casting, machining, assembly, and inspection of large-scale castings for the railway and wind power industries. Our main products include cast steel and cast iron (gray iron, ductile iron, etc.) for locomotives, railcars, high-speed trains, mining equipment, and wind turbines.

Equipped with advanced design capabilities, precise casting processes, comprehensive machining, and rigorous quality inspection, we ensure each product meets the highest industry standards. In addition, we provide professional after-sales support to guarantee customer satisfaction.

Our products have been exported to over 10 countries, including Russia, the United States, Germany, Argentina, Japan, France, South Africa, and Italy, demonstrating our strong international presence in heavy industrial castings.

FAQs

Q1: Are you a manufacturer or a trading company?
A: We are a professional manufacturer. Founded in 1998, we have nearly 30 years of experience in the casting industry. Our facility covers 72,600㎡, with a factory building area of 51,000㎡.

Q2: What are your main products?
A: We specialize in steel casting, iron casting (including gray iron and ductile iron), finished product machining, and component assembly. Our products serve industries such as railway locomotives, railcars, high-speed trains, mining equipment, and wind power.

Q3: How precise can you produce casting parts?
A: We are capable of producing casting parts using various casting processes with high precision. All production strictly complies with ISO 9001, ISO 14001, ISO 45001, EN 15085, and IRIS standards.

Q4: Can you produce according to samples or drawings?
A: Yes, we can manufacture parts based on your samples or technical drawings. If needed, we can also create professional drawings for you from your samples.

Q5: How do you ensure quality control before delivery?
A: Quality control is critical for ensuring the reliability of our castings. We conduct three stages of inspection throughout the production process. Before delivery, we provide clients with material test reports, dimensional inspection reports, and mechanical properties test reports to guarantee product quality.

For more information about our products, please feel free to contact us.
Email:sales@railwaypart.com
Mobile: +86 15515351287