Lesson Notes By Weeks and Term - Junior Secondary 2

Belt and chain drive 2

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TERM – 3RD TERM

WEEK THREE

Class: Junior Secondary School 2

Age: 13 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC TECHNOLOGY

Topic:  BELT AND CHAIN DRIVE 2

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

  1. Identify the Advantages and Disadvantages of belt drive
  2. Identify the Advantages and Disadvantages of chain drive
  3. Identify some similarities and differences between Belt and Chain Drives

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 discusses the advantages and disadvantages of belt drive

Students pay

attention

STEP 2

EXPLANATION

Teacher discusses the advantages and disadvantages of chain drive.

Students pay

attention and

participate

STEP 3

DEMONSTRATION

Teacher compare belt and chain drive using their similarities and differences.

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 2

Advantages of Belt Drive

  1. Belt drives provide smoother and quieter operation compared to some other transmission systems, reducing noise and vibration.
  2. They are relatively easy to install and require less precision than some other drive systems.
  3. Belts can absorb shocks and vibrations, contributing to smoother operation and protecting machinery components.
  4. Belt drives are often cost-effective in terms of both initial installation and maintenance.
  5. Tension in belt drives helps prevent slipping, ensuring a more reliable transfer of power.

Disadvantages of Belt Drive

  1. Belt drives may have limitations in terms of the amount of power they can transmit compared to chain or gear systems.
  2. High-speed applications may be limited due to the potential for slippage at higher speeds.
  3. Proper tension and alignment are critical for efficient operation, and these factors may require regular adjustment.
  4. Exposure to certain environmental conditions, such as oil or heat, can affect the performance and lifespan of belts.
  5. Belts can wear out over time and may stretch, requiring periodic replacement.

Advantages of Chain Drive

  1. Chain drives are capable of transmitting higher levels of power compared to belt drives, making them suitable for heavy-duty applications.
  2. Chains are typically more durable and resistant to wear, providing a longer lifespan and reliability in demanding conditions.
  3. Chain drives are known for their efficiency in power transmission, with minimal power loss compared to some other systems.
  4. Chain drives can operate at higher speeds than belt drives, making them suitable for applications requiring rapid motion.
  5. Chains have minimal slippage, ensuring a more precise and reliable transfer of power.

Disadvantages of Chain Drive

  1. Chain drives can produce more noise and vibration compared to belt drives, which may require additional measures to control.
  2. The installation of chain drives can be more complex than belts, requiring precise alignment and tensioning for optimal performance.
  3. Chains require regular lubrication to prevent wear and ensure smooth operation, adding to maintenance requirements.
  4. Chains and associated components can be heavier and more costly than comparable belt drive systems.
  5. While chains are durable, they can still experience wear over time, necessitating periodic inspection and replacement.

Similarities between belt drive and chain drive

  1. Both belt and chain drives are systems designed to transmit power from one rotating shaft to another.
  2. They can be used in various applications, such as bicycles, motorcycles, and industrial machinery.

Differences between belt drive and chain drive

  1. Belt drives use flexible belts made of materials like rubber, while chain drives utilize metal chains typically made of steel.
  2. Belt drives may experience slippage under heavy loads, affecting efficiency, whereas chain drives are less prone to slippage.
  3. Chains require periodic lubrication for smooth operation, whereas belts generally require less maintenance.
  4. Chain drives can produce more noise and vibration compared to belt drives.
  5. Belt drives are generally more efficient due to less friction, but efficiency can decrease with belt slippage.

EVALUATION: 1. Identify 3 advantages and 3 disadvantages of belt drive

  1. Identify 3 advantages and 3 disadvantages of chain drive
  2. Mention 2 similarities between belt drive and chain drive.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively