Lesson Notes By Weeks and Term - Senior Secondary 3

TERM – 1^ST TERM

WEEK EIGHT

Class: Senior Secondary School 3

Age: 17 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: TYPES OF ENGINE AND FLUID FLY WHEEL II

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

I.) Define fluid flywheel

II.) Identify the types of fluid flywheel

III.) Describe the construction of fluid flywheel

IV.) Discuss the operation of fluid flywheel

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

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

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

TYPES OF ENGINE AND FLUID FLY WHEEL II

Fluid fly wheel

A fluid flywheel, also known as a torque converter, is a type of hydraulic coupling used in automatic transmissions to transmit power from the engine to the transmission. It consists of three main components: the impeller, turbine, and fluid-filled housing.

Types of Fluid Flywheels

1. Basic Fluid Flywheel: This type consists of a simple impeller, turbine, and housing arrangement. It's commonly found in older automatic transmissions and provides basic torque multiplication.
2. Lock-Up Torque Converter: In this type, a mechanical lock-up clutch is added to directly connect the impeller and turbine once a certain speed is reached. This eliminates fluid slippage and improves efficiency, especially at higher speeds.
3. Variable-Speed Torque Converter: Some modern torque converters feature variable vanes in the impeller and turbine to adjust the fluid flow and optimize performance across a range of engine speeds and loads. These are often found in high-performance or fuel-efficient vehicles.

Construction of a fluid flywheel

1. Impeller: The impeller is connected to the engine's crankshaft and spins with it. It consists of a series of curved blades that direct transmission fluid outward.
2. Turbine: The turbine is connected to the transmission's input shaft. It is located within the same housing as the impeller and consists of a set of blades arranged to catch the fluid flowing from the impeller.
3. Stator: Some torque converters include a stator located between the impeller and turbine. The stator redirects fluid flow, improving efficiency by redirecting fluid in the opposite direction to the impeller rotation.
4. Fluid-Filled Housing: The impeller, turbine, and stator (if present) are enclosed within a housing filled with transmission fluid. This fluid allows for smooth transfer of power between the impeller and turbine.

Operation of a fluid flywheel

1. Idle/Starting: At idle or low speeds, the engine spins the impeller, creating a flow of transmission fluid within the housing. The fluid flow causes the turbine to turn, transmitting some power to the transmission.
2. Acceleration: As the engine speed increases, so does the speed of the impeller. The fluid flow becomes more powerful, causing the turbine to rotate faster and transmitting more power to the transmission.
3. Lock-Up (if equipped): In some torque converters, a lock-up clutch engages at higher speeds, mechanically connecting the impeller and turbine. This eliminates fluid slippage and improves efficiency.
4. Deceleration/Braking: When the vehicle slows down or brakes are applied, the impeller slows down, reducing the fluid flow. This allows the turbine to slow down as well, helping to slow down the vehicle without stalling the engine.

EVALUATION: 1. What is a fluid flywheel?

2. Identify the 3 types of fluid flywheel
3. Briefly describe the construction of a fluid flywheel
4. Discuss the operation of a fluid flywheel.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively