Genset Speed Reduction Gearboxes with Cooling

Name: Genset Speed Reduction Gearboxes
Brand: Anand Gears

Anand Gears fabricated helical-bevel genset speed reduction gearbox

Power Generation

Engine-to-Alternator Speed Reduction with Cooling

When a high-speed engine must drive a 1,500 RPM (or similar) alternator, a purpose-built speed-reduction gearbox sits between them. Anand Gears designs fabricated welded-plate helical-bevel housings with external bearing housings — not cast monoliths — so shaft ends, cooling, and foot patterns can be engineered around the genset package.

Step ratios sized to engine RPM → alternator RPM (example builds near 2.8:1)

Large input / output shaft ends (e.g. 55 mm input, 65 mm output class)

Integrated cooling options — pump, motor, couplings, and oil circuit

Fabricated plate housing with external bearing housings

GA / STEP approval cycle for OEM packagers

Continuous generating duty thermal design

Thermal Design

Why Genset Reducers Need Cooling

Even at modest ratios, continuous high power turns mesh and bearing losses into heat. Outdoor or containerised gensets often have limited airflow around the gearbox. Anand Gears can package forced oil cooling (pump + motor + heat exchanger circuit and couplings) with the reducer so oil temperature stays inside the lubricant rating for continuous S1 duty.

Ratio engineering

Ratio is set from engine speed and required alternator speed (for example ~4,200 RPM engine → 1,500 RPM alternator ≈ 2.8:1). We confirm final ratio from the locked engine data sheet, not from early estimates.

Shaft & coupling interface

Input and output diameters, keyways, and overall lengths are machined in millimetres to the coupling OEM drawing so the genset skid does not need field rework.

Housing style

Welded plate side and end walls with external bearing housings — allows larger bearings and service access without a cast monolith pattern.

Documentation

GA drawings and STEP models for packager approval before plate cut and machining.

FAQ

Genset Speed Reduction Gearboxes — Common Questions

What ratio do genset gearboxes usually use?

Ratio equals engine RPM divided by alternator RPM. Builds around 2.5:1–3.5:1 are common when high-speed engines drive 1,500 RPM machines; exact ratio is locked only after the engine datasheet is confirmed.

Do you supply cooling with the gearbox?

Yes. We can supply the reducer alone or a package with oil pump, drive motor, couplings, and cooling circuit sized for continuous generating duty.

Is the housing cast or fabricated?

Genset reducers of this class are typically fabricated welded-plate housings with external bearing housings, so large shafts and cooling ports can be placed where the skid requires.

Genset Speed Reduction Gearboxes