Session 3: Servicing of Differential Unit and Adjustment
Module 3: Transmission System
Textual Question-Answers
Check Your Progress
Fill in the blanks
1. The differential allows wheels to rotate at …………… speedswhen a vehicle turns.
Ans: different.
2. The primary function of the differential is to transfer engine powerto the ……………
Ans: driving wheels.
3. Proper adjustment of backlash ensures correct tooth………………. between gears.
Ans: contact.
4. In the differential, the components responsible for transmittingtorque to the wheels are the half axle ……………Ans: shafts.
Multiple-Choice Questions (MCQs)
1. What is the main purpose of a differential in a vehicle?
A) To increase engine power
B) To reduce fuel consumption
C) To allow wheels to rotate at different speeds during turns
D) To control steering alignment
Ans: C) To allow wheels to rotate at different speeds during turns
2. Which of the following gears is NOT a part of a differential?A) Crown gear
B) Sun gear
C) Star gear
D) Drive gear
Ans: D) Drive gear
3. The differential’s job includes:
A) Increasing transmission speed
B) Slowing down engine power
C) Transferring power to the wheels and allowing speed variation duringturns
D) Providing suspension support
Ans: C) Transferring power to the wheels and allowing speed variationduring turns
4. When a vehicle turns, which wheels travel a shorter distance?A) Front wheels
B) Rear wheels
C) Left wheels
D) Outside wheels
Ans: D) Outside wheels
Answer the following questions
1. What is the function of differential unit?
Ans: The differential unit transmits engine power to the driving wheelsand allows them to rotate at different speeds during turning.
2. What is the importance and working of differential?
Ans: The differential is important for smooth turning of a vehicle. It worksby dividing engine torque between the wheels and allowing the inner andouter wheels to rotate at different speeds while turning.
3. What are the main parts of differential?
Ans: Crown wheel, pinion gear, differential case, spider gears, side gears,
half axles, bearings, and housing.
4. Write the steps to adjust crown wheel and pinion clearance.
Ans: Check backlash with a dial gauge, adjust shims or adjusters, rotategears to ensure smooth contact, and recheck backlash as per specifications.
5. What rotates the differential pinion shafts?
Ans: The rotation of the crown wheel and differential case rotates thedifferential pinion shafts.
6. To which gear half shaft splines are connected?
Ans: Half shaft splines are connected to the side gears of the differential.
7. What kind of joint is used to link differential with shaft and why?
Ans: Universal joint is used because it allows angular movement andsmooth transmission of power.
8. What lubricants are commonly used in differential?
Ans: Hypoid gear oil is commonly used in the differential.
Activity
1. Make a list of the functions performed by a differential.
Ans:
S. no. Functions
1. Transmits engine power to driving wheels
2. Allows wheels to rotate at different speeds
3. Helps smooth turning of vehicle
4. Reduces tyre wear
5. In a vehicle, to overhaul the differential unit and carry out thenecessary adjustments, make a list of necessary steps.
Ans:
S. No. Steps
1. Drain differential oil and remove differential assembly
2. Inspect gears, bearings, and seals for wear
3. Adjust crown wheel and pinion backlash
4. Reassemble and refill with recommended lubricant.
