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Helical Gear Box

Helical Gear Box

Helical gearboxes are engineered for applications with high shock loads and continuous duty, such as rolling mills and heavy industrial drives. Housings for small and medium sizes are made from fabricated steel plates of SAIL only, with generously ribbed stress zones to resist distortion under dynamic loading. We at Nav Bharat Engineering Works are one of the top helical gearbox manufacturers with more than 40 years of experience in supplying rolling mill solutions to various industries. In a helical gearbox, the teeth are angled, and they engage progressively along a diagonal rather than all at once. Due to this, the gear operation is smooth and quiet. The impact, vibrations and noise drop is significant. We provide this type of gearbox for rolling mills in steel production, construction works, automotive and heavy engineering industries. A big advantage of our gearbox is that they achieve 96-98 % efficiency in power transmission.

Our Helical Gearbox Design

With a power range of 400-500 kW and an input speed of 700-1,500 RPM, our helical gearbox is designed for industrial applications where high-speed power is needed. It is developed for remarkable efficiency to lose minimal energy due to heat, friction, etc. The torque is stated to be 1200 Nm, which helps the heavy metal bear the resistance during the rolling process. 3-4 stages reduce the speed and provide more torque for slow rotation. As the rolling process can be demanding for the gear surfaces, the teeth have a hardness in the range of 58-60 HRC.

Technical Specifications:

Robust, high-efficiency drive for rolling mill roughing and intermediate stands.

Power Range: 100-500 kW; torque up to 1200 kNm.
Design: 3-4 stage vertical helical gears; case-carburized at 58-60 HRC; DIN 3990 service factors.
Ratios: 10:1 to 60:1; input speeds 700-1500 rpm.
Efficiency: 96-98%; low vibration and noise.
Features: Stress-relieved housing, forced lubrication, thrust bearings; 15+ year service life.
We use only SKF / FAG / NTN bearings in our machinery and gearboxes
Applications: Pinion stands, reduction drives in hot/cold rolling mills.

Construction Benefits

The housing of our gearbox is stress-relieved. Hence, it maintains its alignment and stability during service.
With forced lubrication between gears and bearings and external heat exchangers, the machine can last more than 15 years.
Thrust bearings keep the shaft in the correct alignment under axial loading.
We use SKF, FAG, and NTN bearings to support shaft rotation, manage radial loads and reduce friction between components.
Smooth and quiet operation of the gears and bearings due to helical teeth.
The accurate shaft end tolerances enable correct coupling fit.

Key Design Highlights:

Heat-treated internals (approx. 300 BHN pinions, 260 BHN gears) prior to tooth cutting
Shaft extensions with deep axial holes and provision for hydraulic extraction of bearings and couplings
We use only SKF / FAG / NTN bearings in our machinery and gearboxes.
External heat exchangers and forced lubrication options where required
Accurate shaft end tolerances and positive oil flow to bearings in either direction of rotation

Typical applications: automotive auxiliaries, steel plants, rolling mills.

Applications of Our Helical Gearbox

Roughing Stands: At the early stage of the rolling mill to drive the rollers.

Intermediate Stands: To reduce the steel size and shape as per required dimensions.

Pinion Stands: Distribute and transmit power to the rollers in the mill.

Select Best Helical Gearbox in The Industry

Nav Bharat Engineering Works supplies reliable rolling mill solutions as one of the trusted helical gearbox manufacturers. In our vast experience, we have completed the installation and establishment of rolling mills for a wide number of clients. Among the various parts of these mills, our helical gearbox acts as an efficient power transmission unit. Every unit is designed to deliver accurate, predictable and precise performance for long years of service.