Design and Working of Differential Gear

1. SIR C.R REDDY COLLEGE OF ENGINEERING, ELURU
Design and Working of
Differential Gear
K.S. SARAN KUMAR
(315277133004)
M.E (Machine Design)

2. Contents
• Introduction
• Synopsis
• Functional description
• Types of Differential gears
• Working
• Cases
• Merits / Demerits

3. DIFFERENTIAL GEAR

4. 50cc Honda Gerotor
differential gear chain

5. A differential is a device, usually but not
necessarily employing gears, capable of transmitting
torque and rotation through three shafts, almost
always used in one of two ways. In one way, it
receives one input and provides two outputs; this is
found in most automobiles. In the other way, it
combines two inputs to create an output that is the
sum, difference, or average, of the inputs.
SYNOPSIS

6. Wheels receive Power from Engine to wear Drive Shaft.

7. Functional Description:
Axial Ratio of Pinion gear to Ring gear is 4:1

9. TYPES OF DIFFERENTIAL GEARS:
 Open Differential
 Locking Differential
 Limited-Slip Differential (LSD)
 Auto LSD

10. How a car differential works:

11. Open Differential:
Input torque is applied
to the ring gear (blue), which
turns the entire carrier (blue),
providing torque to both side
gears (red and yellow), which
in turn may drive the left and
right wheels. If the resistance
at both wheels is equal, the
planet gear (green) does not
rotate, and both wheels turn
at the same rate.

12. Locking Differential:
When Brake is applied,
the carrying load acting on
the Differential is High. So ,
that one more Spider Gear
(Messed with two side gears)
is added to LSD and it is
similar to Open Differential.

13. Limited-Slip Differential (LSD):
If the left side gear
(red) encounters resistance,
the planet gear (green)
rotates about the left side
gear, in turn applying extra
rotation to the right side
gear (yellow).

14. Traction-Aiding devices:
Air Locking Differential

15. Cross - sectional views:

16. Cases : (At different speeds)
NLeft > Nright - Turns to Right direction.
NLeft = Nright - Straight direction along with
Ring Gear.
NLeft < Nright - Turns to Left direction.
N – Speed of wheel in RPM

19. Merits / Demerits:
 In Automobile, Differential has speed
reduction due to high gear ratio (power flow) .
 Therefore, LEMIDENT-SLIP Differentials are
Introduced.

20. Thank You…