Lesson Notes By Weeks and Term - Junior Secondary 2

Belt and chain drive

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TERM – 3RD TERM

WEEK TWO

Class: Junior Secondary School 2

Age: 13 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC TECHNOLOGY

Topic:  BELT AND CHAIN DRIVE

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

  1. Define belt drive
  2. Identify types and uses of belt drive
  3. Define chain drive
  4. Identify types and uses of chain drive.

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

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

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher explains the meaning belt drive

Students pay

attention

STEP 2

EXPLANATION

Teacher state and discuss the types and uses of belt drive.

Students pay

attention and

participate

STEP 3

DEMONSTRATION

Teacher the explains chain drive and discuss the types and uses of chain drive.

Students pay

attention and

participate

STEP 4

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

BELT AND CHAIN DRIVE

Belt drive

A belt drive is a mechanical transmission system that uses a flexible belt, often made of materials like rubber or synthetic polymers, to transfer power between two rotating shafts. It is commonly employed in various applications, such as vehicles, industrial machinery, and household appliances, to transmit motion and power from one component to another.

Types of belt drive

There are several types of belt drives, each designed for specific applications. Some common types include:

  1. Flat Belt Drive: Uses a flat, flexible belt for power transmission.
  2. V-Belt Drive: Employs V-shaped belts and pulleys for increased friction and better power transmission efficiency.
  3. Synchronous Belt Drive (Timing Belt): Utilizes toothed belts and pulleys for precise synchronization of shafts.
  4. Round Belt Drive: Involves round belts made of various materials for light-duty applications.

 Uses of belt drive

Belt drives are utilized in various applications due to their versatility and efficiency in power transmission. The following are common uses:

  1. In vehicles, belt drives are employed for accessories like alternators, water pumps, and power steering pumps.
  2. Belt drives are used in machinery such as conveyor systems, printing presses, and manufacturing equipment to transmit power between rotating components.
  3. Washing machines, dryers, and vacuum cleaners often use belt drives to transfer power within the appliance.
  4. Heating, ventilation, and air conditioning systems utilize belt drives to power fans, blowers, and pumps.
  5. Belt-driven systems are found in various power tools, including drills and lathes, for efficient power transmission.

Chain Drive

A chain drive is a mechanical transmission system that employs a chain to transfer power between two rotating shafts. The chain is typically made of metal links and meshes with toothed gears or sprockets on the shafts. Chain drives are known for their durability and ability to transmit high loads efficiently. They find applications in various machinery and vehicles, providing a reliable means of power transmission in situations where belts may not be suitable.

Types of chain drive

There are several types of chain drives, each designed for specific applications. Some common types include:

  1. Roller Chain Drive: The most common type, consisting of metal rollers linked by pins and connected to toothed sprockets.
  2. Silent Chain Drive: Also known as an inverted-tooth chain, it uses toothed links in a synchronous manner for quieter operation.
  3. Leaf Chain Drive: Composed of interlocking links with no rollers, commonly used in forklifts and other lifting equipment.
  4. Timing Chain Drive: Similar to a roller chain but designed for precise timing in internal combustion engines, controlling the opening and closing of engine valves.
  5. Drag Chain Drive: Utilized in conveyors, consisting of a series of connected articulated metal plates.

Uses of chain drive

Chain drives are widely used in various applications due to their durability, strength, and efficient power transmission. Common uses include:

  1. Chain drives are used in vehicles for applications such as timing chains in internal combustion engines and drive chains in motorcycles.
  2. Conveyors, machine tools, and manufacturing equipment often utilize chain drives for power transmission in heavy-duty applications.
  3. Bicycle chains and motorcycle drive chains are integral components for transmitting power from pedals to wheels or from the engine to the wheels.
  4. Tractors and other farming machinery employ chain drives for functions like powering combine harvesters and other equipment..
  5. Chain drives are common in power transmission systems for various industrial applications, providing a dependable means of transferring

EVALUATION: 1. What is a belt drive?

  1. Identify 5 uses of a belt drive
  2. Mention and explain 3 types of chain drive.
  3. Differentiate between belt drive and chain drive.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively