Lesson Notes By Weeks and Term v4 - SHS 2
INTRODUCTION TO VEHICLE TECHNOLOGY
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INTRODUCTION TO VEHICLE TECHNOLOGY
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Applied Technology
Class: SHS 2
Term: 1st Term
Week: 5
Grade code: 2.1.2.LI.2
Strand code: 1
Sub-strand code: 2
Content standard code: 2.1.2.CS.1
Indicator code: 2.1.2.LI.2
Theme: AUTOMOTIVE TECHNOLOGY
Subtheme: INTRODUCTION TO VEHICLE TECHNOLOGY
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This lesson introduces the fundamental principles of a vehicle's steering system. Understanding how a driver controls the direction of a vehicle is crucial for safety, maintenance, and overall vehicle performance. In Ghana, from the tro-tros we ride daily to the private cars on our highways, the steering system is what connects the driver's intention to the vehicle's movement. A poorly maintained steering system can lead to accidents, rapid tyre wear, and increased fuel consumption, affecting both our safety and our pockets. This lesson will demystify this critical system, explaining its parts and the important geometric angles that make it work efficiently.
PART A: Main Components of the Steering System (Rack and Pinion Type)
The most common steering system in modern passenger cars is the Rack-and-Pinion system. It is simple, lightweight, and provides a direct feel of the road. Let's trace the path from the driver's hands to the wheels. Steering Wheel: The circular wheel the driver holds to input steering commands. Steering Column (or Shaft): A long shaft that connects the steering wheel to the steering gearbox. For safety, many are designed to collapse during a frontal collision to protect the driver. Universal Joints: Flexible joints in the steering column that allow it to be angled, connecting the steering wheel to the steering gear which is located lower down in the engine bay. Steering Gearbox (The Rack and Pinion Unit): This is the core of the system. It converts the rotational motion from the steering wheel into the linear (side-to-side) motion needed to turn the wheels. Pinion: A small, circular gear attached to the end of the steering column. Rack: A long, flat bar with teeth cut into one side. The pinion gear meshes with the teeth of the rack. Tie Rods (Inner and Outer): These rods connect the ends of the rack to the steering knuckles. They are the link that pushes and pulls the wheels to turn them. They have threaded adjustments that are used during wheel alignment. Steering Knuckle: A C-shaped component that holds the wheel hub and brake assembly. It pivots on ball joints, allowing the front wheels to turn left or right.
How the Rack-and-Pinion System Operates (Step-by-Step): Step 1: The driver turns the steering wheel. Step 2: This rotation is transferred down the steering column. Step 3: The pinion gear at the end of the column rotates. Step 4: As the pinion rotates, its teeth force the rack to slide sideways (left or right). Step 5: The tie rods, connected to the ends of the rack, either push or pull on the steering knuckles. Step 6: The steering knuckles pivot, causing the vehicle's front wheels to turn in the desired direction.
*(Teacher's Note: Use a simple drawing on the board showing the pinion gear turning and moving the rack left and right.)*