TERM – 2^ND TERM

WEEK SIX

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: SUSPENSION AND STEERING SYSTEM II

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

I.) Define a steering box

II.) Identify types of steering box

III.) Differentiate between recirculating ball steering box and rack and pinion steering box

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 of a steering box and discuss the types of steering box	Students listens attentively to the teacher
STEP 2 EXPLANATION	Teacher discuss the differences between recirculating ball steering box and rack and pinion steering box	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

SUSPENSION AND STEERING SYSTEM II

A steering box, also known as a steering gearbox or steering gear, is a mechanical component in a vehicle's steering system responsible for translating the rotational motion of the steering wheel into lateral motion to turn the wheels. It's an essential part of traditional steering systems, particularly in older vehicles.

Types of steering box

Recirculating Ball Steering Box: This type of steering box uses a worm gear and recirculating ball mechanism to convert steering wheel rotation into lateral movement. The worm gear rotates a nut connected to a series of ball bearings, which move along grooves in the nut to push or pull the steering linkage, turning the wheels. Recirculating ball steering boxes are known for their durability and strength.
Rack and Pinion Steering Box: In this type of steering box, a rack (a flat, toothed metal bar) meshes with a pinion gear (a small, circular gear) attached to the steering shaft. As the steering wheel turns, the pinion gear rotates, causing the rack to move laterally. This motion is transmitted to the steering linkage, turning the wheels. Rack and pinion steering boxes are commonly used in modern vehicles due to their compact design and responsive steering feel.

Differences between recirculating ball steering box and rack and pinion steering box

Features	Recirculating Ball Steering Box	Rack and Pinion Steering box
Mechanism	Uses a worm gear and recirculating ball mechanism	Consists of a rack and pinion gear system
Size and Weight	Tends to be larger and heavier due to the design of the gear mechanism	Generally more compact and lightweight
Durability	Known for durability and strength, capable of handling heavy loads	May be more susceptible to wear and tear over time, especially in extreme conditions
Steering Response	Offers good steering response and control, especially at higher speeds	Provides precise steering response and handling, particularly in tight maneuvers
Maintenance	Requires periodic lubrication and maintenance of the ball bearings and gear mechanism	Generally requires less maintenance compared to recirculating ball systems

EVALUATION: 1. What is a steering box

Mention the 2 types of a steering box
Give 5 differences between recirculating ball steering box and rack and pinion steering box

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively

Lesson Notes By Weeks and Term - Senior Secondary 1