Differential gear, in auto mechanics, gear arrangement that allows power from the engine to be transmitted to a pair of traveling wheels, dividing the force equally between them but permitting them to follow paths of different lengths, as when turning a corner or traversing an uneven road. On a straight street the wheels rotate at the same speed; when turning a corner the outside wheel provides farther to go and will turn faster than the inner wheel if unrestrained.

The elements of the Ever-Power differential are proven in the Figure. The power from the transmission is delivered to the bevel band gear by the drive-shaft pinion, both of which are kept in bearings in the rear-axle housing. The case is an open boxlike framework that’s bolted to the band gear and contains bearings to support one or two pairs of diametrically reverse differential bevel pinions. Each steering wheel axle is mounted on a differential side equipment, which meshes with the differential pinions. On a directly road the tires and the medial side gears rotate at the same velocity, there is no relative motion between your differential aspect gears and pinions, and they all rotate as a unit with the case and band gear. If the Differential Gear automobile turns to the left, the right-hand steering wheel will be required to rotate faster compared to the left-hand steering wheel, and the side gears and the pinions will rotate relative to each other. The ring equipment rotates at a quickness that is add up to the mean rate of the remaining and right wheels. If the wheels are jacked up with the transmitting in neutral and among the wheels is turned, the opposite wheel will turn in the opposite direction at the same velocity.

The torque (turning second) transmitted to both wheels with the Ever-Power differential is the same. Therefore, if one steering wheel slips, as in ice or mud, the torque to the other steering wheel is decreased. This disadvantage could be overcome relatively by the usage of a limited-slide differential. In one version a clutch connects one of the axles and the ring gear. When one steering wheel encounters low traction, its tendency to spin is resisted by the clutch, hence providing greater torque for the other wheel.
A differential in its most elementary form comprises two halves of an axle with a equipment on each end, linked with each other by a third equipment making up three sides of a sq .. This is normally supplemented by a 4th gear for added power, completing the square.