The working principle of the lower device outside the hull

Basically, the lower part of the hull is like a gearbox composed of different components, responsible for power transmission. All power from the outboard motor is sent to the lower unit and transmitted to the propeller shaft and propeller.
All components of the outboard lower device work together to move the ship. The working principle of each component is as follows:

• The transmission shaft transfers the power of the engine (or power head) to the gearbox. It works in conjunction with the water pump and also plays an important role in engine cooling.
• The water pump is installed on the drive shaft and obtains power through the rotation of the drive shaft. It circulates water in the internal cooling system to maintain engine cooling.
• The shift shaft is responsible for transmitting the motion that causes the outboard engine to shift into or out of gear, allowing you to select different gears (forward, neutral, reverse) and control speed. For example, if you rotate the shift shaft counterclockwise, the engine will be in forward gear.
• The gearbox is the core component of the lower device, including the small gear, claw clutch, forward gear, and reverse gear. It converts the vertical rotational power of the engine into horizontal rotational power to rotate the propeller or rotor.
• Rudder fins help keep the ship sailing in a straight line and turning accurately. It can also protect the propeller from underwater obstacles.