The differential is one of the main components of the driving axle, the engine output torque is a divided into two, allowing the device to non-uniformly rotating axle on both sides of the car tire and the friction surface is greatly reduced .
1. Differential Structure
generally consists essentially of a planetary gear differential, the planet wheel carrier (differential case), the side gears and other components. The power of the engine through the shaft into the differential directly drives the planet gear carrier, and then drive the left and right by the two planetary gear axle, drive the left and right wheels. To meet design requirements 🙁 differential speed left axle) + (right axle speed) = 2 (the rotational speed of the planetary carrier).
inter-axle differential: usually the driven wheel bearing mandrel, so that it can at any angular speed and the drive wheels are rigidly connected to the two half shafts, between the two half shafts inter-axle differential is equipped with differential.
2. The action principle
When the vehicle straight ahead, right and left wheels and the planet carrier rotational speed equal to three, in an equilibrium state. When cornering, since the outer roller drag, the inner wheel slip phenomenon, and the two wheels will generate additional force two opposite directions, according to ldquo; rdquo ;, the minimum energy principle wheels on both sides will have a rotational speed different phenomena, thereby destroying the balance between the three, and reflected by the axle side gear, the rotation force generated planetary gear, speed up the outer axle speed, slow speed of the inner axle, the wheel speed difference to achieve both sides.
inter-axle differential can be reduced tire wear, reduced power and fuel consumption, to improve the steering, braking performance, preventing wheel slip.
3. Differential Category
according to their operating characteristics of the differential gear is usually divided into two categories differential and slip differential.
The differential gear
When the left driving wheel rotation speed difference exists, the differential rotation of the drive wheel assigned to the slow rotation speed of the drive wheel torque is greater than torque. This differential torque split to meet the characteristics of a normal car driving on good roads. But when the car while driving on the way bad, but seriously affected by capacity. For example, when a wheel of the car stuck in the mud road, while the other wheel on the good road, the car often can not move forward (commonly known as slip). At this time, the drive wheels in situ on the muddy road slip, the wheel on the road has good stationary. This is because the smaller the adhesion between the wheel and the road surface on a muddy road, a road surface only through a small reaction torque round of side effect, and therefore the torque distributed to the differential is small round, Although other drive wheel with good adhesion between the road surface is large, but the average distribution of torque characteristics, so that the drive wheel can only be assigned with the same amount of drive wheel slip torque, so that the driving force is insufficient to overcome the running resistance, car can not move forward, and the power is consumed by the drive wheels slip. At this point it should not be stepped on the gas, but the opposite effect occurs. Generally dug by the drive wheel slip mud or dry round underlying soil, gravel, hay or the like process.
LSD
Characteristics
is a limited slip differential, when the wheels slip on the bad side of the road, most or all of the torque can pass on the good road wheel, in order to take full advantage of the adhesion of the driving wheels to generate sufficient driving force, making the car a smooth start or continue driving. Limited slip differential device, can increase the capacity of the car by bad road, generally used for off-road vehicles or certain limousine.