Discover how gearbox housings are fabricated from sheet metal for industrial power transmission. Learn about oil sealing, thermal management, and real-world applications.
Introduction
Gearbox housings enclose gear sets that transmit and modify power in industrial machinery. These housings must contain lubricants, support gear shafts, dissipate heat, and provide maintenance access. At Fulei Metal, we fabricate gearbox housing components for power transmission equipment manufacturers across Europe and Japan.
Gearbox Housing Types
Inline gearbox housings enclose parallel shaft gear sets for same-direction power transmission. Right-angle gearbox housings enclose bevel or worm gear sets for perpendicular power transmission. Planetary gearbox housings enclose planetary gear sets for compact, high-ratio transmission. Multi-speed gearbox housings enclose gear sets with shift mechanisms. Custom gearbox housings are designed for specific applications and configurations.
Material Selection
Cold-rolled steel (2.0 to 4.0 mm) provides housings for medium-duty applications with adequate strength and oil containment. For heavy-duty applications, thicker steel (4.0 to 6.0 mm) provides necessary strength and rigidity. Stainless steel (grade 304) provides housings for food processing and corrosive environments. Aluminum provides lightweight housings for portable equipment. All materials must contain lubricating oil without degradation.
Design Considerations
Housings must contain lubricating oil without leakage, requiring precise fabrication and sealing. Housing rigidity must maintain gear alignment under torque loads. Thermal management must dissipate heat through surface area, cooling fins, or external coolers. Breather mechanisms must allow pressure equalization. Oil level indicators and drain plugs must be accessible. Inspection covers must provide maintenance access. Mounting features must support the gearbox and transmit torque. All external surfaces must be safe for personnel contact.
Fabrication Process
Our TRUMPF fiber laser cuts housing panels, cover plates, and mounting flanges from flat sheet stock with precise dimensions for oil sealing. CNC press brake machines form housing profiles, oil pan sections, and cooling fins. Component assembly uses MIG welding for steel and TIG welding for stainless steel, with continuous welds for oil containment. Surface treatments include oil-resistant powder coating and internal cleaning to remove manufacturing residues.
Case Study: Gearbox Housings for a Norwegian Industrial Project
Gearbox housings and machined support components were produced at Fulei Metal in 2025 for a Norwegian manufacturing customer, within a production run of close to 1,000 pieces. A housing is a different kind of part from an enclosure: it is not a box that contains something, it is a structure that locates something, and the dimensions that matter are the ones that set the position of a shaft or a bearing. That shifts the whole emphasis of the work. The critical features are machined after forming rather than formed and left, because a folded or welded housing moves slightly and a bearing seat cannot move at all. The position of each machined face relative to the others is what is checked, not only the size of each one – a housing where every individual dimension is correct can still put the shaft out of line.
Conclusion
Gearbox housing fabrication requires oil containment engineering, thermal management, and precision manufacturing. Fulei Metal’s capabilities make us a trusted partner for power transmission housing projects.
For OEM buyers the practical next step is a drawing review — see our DFM engineering review for what we need and how fast we turn it around. This work sits inside our custom metal enclosure manufacturing capability, and Reducer Housing Fabrication explains the technical background in more detail.