Lesson Notes By Weeks and Term - Senior Secondary 2

TERM – 1^ST TERM

WEEK EIGHT

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: TRANSMISSION SYSTEM II

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.) What is a single plate clutch

II.) Discuss the construction of single plate clutch

III.) Describe the operation of a single plate clutch

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

TRANSMISSION SYSTEM II

Single plate clutch

A single plate clutch is a type of friction clutch used in vehicles with manual transmissions to engage and disengage power transmission between the engine and the gearbox. It consists of a single clutch disc sandwiched between a flywheel attached to the engine and a pressure plate mounted to the transmission input shaft. When engaged, the clutch disc is pressed against the flywheel, transmitting power from the engine to the transmission.

Construction of a Single Plate Clutch

A single plate clutch consists of the following main components:

1. Clutch Disc: The central component of the clutch, typically made of friction material bonded to a metal plate. It has splines on its inner circumference to engage with the transmission input shaft and is attached to the flywheel.
2. Pressure Plate: A metal cover that applies pressure to the clutch disc against the flywheel. It is mounted to the flywheel using springs or a diaphragm spring mechanism.
3. Flywheel: A heavy wheel attached to the engine crankshaft, providing inertia and rotational energy. The clutch disc is sandwiched between the flywheel and pressure plate.
4. Release/Throw-out Bearing: A bearing mounted on a release fork that disengages the clutch when the clutch pedal is depressed. It applies force to the pressure plate to release the pressure on the clutch disc.

Operation of a Single Plate Clutch

1. Engagement: When the driver releases the clutch pedal, springs or a diaphragm spring in the pressure plate exert pressure on the clutch disc, sandwiching it tightly between the pressure plate and flywheel. This creates frictional contact between the clutch disc and flywheel, transmitting power from the engine to the transmission input shaft.
2. Disengagement: When the driver depresses the clutch pedal, the release/throw-out bearing moves forward, pushing on the diaphragm spring or release fingers of the pressure plate. This action releases the pressure on the clutch disc, allowing it to move away from the flywheel. As a result, power transmission between the engine and transmission input shaft is interrupted, enabling the driver to shift gears or come to a stop without stalling the engine.
3. Neutral: When the clutch pedal is fully depressed, the clutch is disengaged, and the engine and transmission input shaft are decoupled. This state is known as being in neutral, allowing the engine to run independently without transmitting power to the wheels.

EVALUATION: 1. What is a single plate clutch?

2. Briefly describe the construction of a single plate clutch
3. Discuss the operation of a single plate clutch

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively