Describe, with the aid of a sketch, the operation of a diesel engine propulsion system air operated radial tyre type clutch.(10)
Operation of a Diesel Engine Propulsion System Air Operated Radial Tire Type Clutch
A diesel engine propulsion system with an air-operated radial tire type clutch is a specialized system commonly used in heavy-duty applications, such as construction equipment and marine vessels.
Components of the System:
- Diesel Engine: Provides the power source.
- Flywheel: Attached to the engine crankshaft.
- Clutch Housing: Encloses the clutch components.
- Pressure Plate: Applies pressure to the friction surfaces.
- Friction Discs: Radial tires mounted on a hub, alternating with steel plates.
- Pneumatic Actuator: Controls the application of compressed air to the pressure plate.
- Drive Shaft: Connected to the output of the clutch.
Operating Principle:
- Engaged: When compressed air is supplied to the pneumatic actuator, it pushes against the pressure plate, forcing it into contact with the friction discs. The friction between the rubber tires and the steel plates creates torque transmission.
- Disengaged: When the air supply is reduced or cut off, the pressure on the pressure plate decreases, allowing the friction discs to separate, disengaging the clutch.
Key Features of Radial Tire Clutches:
- High Torque Capacity: Radial tires provide a large contact area, enabling the transmission of high torque.
- Smooth Engagement: The rubber tires contribute to smooth clutch engagement and disengagement.
- Vibration Damping: The rubber tires can absorb vibrations, reducing shock loads on the drivetrain.
- Overload Protection: In some cases, the rubber tires can slip under excessive load, protecting the drivetrain.
It’s important to note that while radial tire clutches offer several advantages, they also have limitations, such as relatively high wear rates and the need for regular maintenance.
Advantages and Disadvantages of Radial Tire Clutches in Marine Propulsion
Advantages of Radial Tire Clutches
- High Torque Capacity: Radial tire clutches can transmit significant torque due to the large contact area between the tires and steel plates.
- Smooth Engagement: The rubber tires provide a smooth power transfer, reducing shock loads on the drivetrain.
- Vibration Damping: The rubber tires absorb vibrations, improving ride comfort and reducing wear on connected components.
- Overload Protection: In some cases, the rubber tires can slip under excessive load, protecting the drivetrain.
- Relatively Simple Design: Compared to other clutch types, radial tire clutches have a simpler construction.
Disadvantages of Radial Tire Clutches
- Wear: The rubber tires are subject to wear, requiring frequent inspections and replacements.
- Heat Build-up: The friction generated during operation can lead to heat buildup, affecting clutch performance.
- Oil Contamination: Oil contamination can degrade the performance of the rubber tires.
- Limited Slip Control: While radial tire clutches offer some degree of slip, precise control over slip is limited compared to other clutch types.
Despite these disadvantages, radial tire clutches remain a popular choice in marine propulsion due to their high torque capacity and smooth operation.