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
- Identify the Advantages and Disadvantages of belt drive
- Identify the Advantages and Disadvantages of chain drive
- 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
- Belt drives provide smoother and quieter operation compared to some other transmission systems, reducing noise and vibration.
- They are relatively easy to install and require less precision than some other drive systems.
- Belts can absorb shocks and vibrations, contributing to smoother operation and protecting machinery components.
- Belt drives are often cost-effective in terms of both initial installation and maintenance.
- Tension in belt drives helps prevent slipping, ensuring a more reliable transfer of power.
Disadvantages of Belt Drive
- Belt drives may have limitations in terms of the amount of power they can transmit compared to chain or gear systems.
- High-speed applications may be limited due to the potential for slippage at higher speeds.
- Proper tension and alignment are critical for efficient operation, and these factors may require regular adjustment.
- Exposure to certain environmental conditions, such as oil or heat, can affect the performance and lifespan of belts.
- Belts can wear out over time and may stretch, requiring periodic replacement.
Advantages of Chain Drive
- Chain drives are capable of transmitting higher levels of power compared to belt drives, making them suitable for heavy-duty applications.
- Chains are typically more durable and resistant to wear, providing a longer lifespan and reliability in demanding conditions.
- Chain drives are known for their efficiency in power transmission, with minimal power loss compared to some other systems.
- Chain drives can operate at higher speeds than belt drives, making them suitable for applications requiring rapid motion.
- Chains have minimal slippage, ensuring a more precise and reliable transfer of power.
Disadvantages of Chain Drive
- Chain drives can produce more noise and vibration compared to belt drives, which may require additional measures to control.
- The installation of chain drives can be more complex than belts, requiring precise alignment and tensioning for optimal performance.
- Chains require regular lubrication to prevent wear and ensure smooth operation, adding to maintenance requirements.
- Chains and associated components can be heavier and more costly than comparable belt drive systems.
- While chains are durable, they can still experience wear over time, necessitating periodic inspection and replacement.
Similarities between belt drive and chain drive
- Both belt and chain drives are systems designed to transmit power from one rotating shaft to another.
- They can be used in various applications, such as bicycles, motorcycles, and industrial machinery.
Differences between belt drive and chain drive
- Belt drives use flexible belts made of materials like rubber, while chain drives utilize metal chains typically made of steel.
- Belt drives may experience slippage under heavy loads, affecting efficiency, whereas chain drives are less prone to slippage.
- Chains require periodic lubrication for smooth operation, whereas belts generally require less maintenance.
- Chain drives can produce more noise and vibration compared to belt drives.
- 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
- Identify 3 advantages and 3 disadvantages of chain drive
- Mention 2 similarities between belt drive and chain drive.
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively
