Lesson Notes By Weeks and Term - Senior Secondary 2

Transmission system III

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TERM – 1ST TERM

WEEK NINE

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: TRANSMISSION SYSTEM III

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

I.) Define a gearbox

II.) Identify the main parts of a gearbox

III.) Discuss the operation of a sliding mesh gearbox

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 a gearbox and identify the parts of a gearbox

Students listens attentively to the teacher                                                                          

STEP 2

EXPLANATION

Teacher discusses how a sliding mesh gearbox operate.

Students exhibit attentiveness and active engagement

STEP 3

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

TRANSMISSION SYSTEM III

The Gearbox

A gearbox is a mechanical device that transmits power from one part of a machine to another by changing the speed, torque, and direction of rotation.

The main parts of a gearbox include:

  1. Input shaft: Receives power from the engine or motor.
  2. Output shaft: Transmits power to the rest of the machine.
  3. Gears: Mechanisms that transfer power and change speed.
  4. Bearings: Support the moving parts and reduce friction.
  5. Housing: Encloses and protects the internal components.
  6. Seals: Prevent leakage of lubricants.

Operation of a sliding mesh gearbox

A sliding mesh gearbox operates by sliding gears into mesh with each other to engage different gear ratios. When a gear is shifted, it slides along the shaft to mesh with the corresponding gear on another shaft, changing the speed ratio between the input and output shafts.

To dismantle a gearbox:

  1. Disconnect the gearbox from the power source and drain any lubricants.
  2. Remove any external components such as covers or guards.
  3. Separate the input and output shafts, typically by removing bolts or fasteners.
  4. Carefully disassemble the gearbox, keeping track of the order and orientation of components.
  5. Inspect each part for wear or damage, replacing any necessary components.
  6. Clean all parts thoroughly to remove dirt and debris.
  7. Reassemble the gearbox in the reverse order, ensuring proper alignment and lubrication of components.
  8. Test the gearbox to ensure it operates correctly before putting it back into service.

EVALUATION: 1. What is a gearbox?

  1. Identify 5 parts of a gearbox
  2. State the operation of a sliding mesh gearbox

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively