Reversible Reduction Gear for Marine Diesel Engine and Z- Drive Propeller

B. Mohanlal

Reversible Reduction Gear for Marine Diesel Engine and Z- Drive Propeller

B. Mohanlal of Kerala observed the inconvenience of the local fishermen while fishing with boats using diesel engines or petrol-start kerosene run engines, with an inbuilt gearbox. The boats with diesel engine had a long tail propeller system without gearbox, which affected their maneuverability. The kerosene run engines consumed more fuel and polluted the water affecting the marine life adversely. Moreover, beach landing is very difficult using the conventional inboard marine diesel engines. After rigorous research and development, Mohanlal developed a gearbox and manually tiltable Z-drive system for small capacity diesel engines to overcome the above problems. The gearbox has been developed for a 12HP diesel engine with 2400 RPM idling speed and around 12 liters fuel tank capacity. The diesel engine directly couples with two reduction gears through flange coupling with the engine flywheel. The innovativeness lies in the application of helical gears with inner spline cut with dual sided jaw and dog clutch. This provides smooth running and better power transmission for the marine diesel engines. The salient features of the Z drive system to go along with the gearbox for diesel engines are that it is manually tiltable and can be locked at 90 degrees while landing. It also reduces loss of power through horizontal shaft power transmission and results in a smooth drive and better maneuverability. This product came for the first time in the market in the year 2007.