Differential gear, in automotive 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 check out paths of different lengths, as when turning a corner or traversing an uneven road. On a straight street the tires rotate at the same quickness; when turning a part the outside wheel provides farther to move and can turn faster compared to the inner wheel if unrestrained.

The elements of the Ever-Power differential are shown in the Figure. The power from the transmitting is delivered to the bevel ring equipment by the drive-shaft pinion, both which are held in bearings in the rear-axle casing. The case is an open boxlike structure that is bolted to the ring gear and contains bearings to support one or two pairs of diametrically opposite differential bevel pinions. Each steering wheel axle is mounted on a differential side gear, which meshes with the differential pinions. On a directly road the tires and the side gears rotate at the same swiftness, there is no relative motion between your differential side gears and pinions, and they all rotate as a unit with the case and ring gear. If the vehicle turns to the left, the right-hand wheel will be required to rotate faster than the left-hand steering wheel, and the medial side gears and the pinions will rotate in accordance with each other. The ring gear rotates at a velocity that is add up to the mean swiftness of the still left and right wheels. If the tires are jacked up with the tranny in neutral and among the wheels is turned, the contrary wheel will submit the opposite direction at the same quickness.

The torque (turning minute) transmitted to both wheels with the Ever-Power differential may be the same. Therefore, if one steering wheel slips, as in ice or mud, the torque to the other steering wheel is reduced. This coupling China disadvantage could be overcome relatively by the usage of a limited-slide differential. In one edition a clutch connects among the axles and the ring gear. When one steering wheel encounters low traction, its tendency to spin is usually resisted by the clutch, thus providing better torque for the other wheel.
A differential in its most elementary form comprises two halves of an axle with a equipment on each end, connected with each other by a third equipment creating three sides of a sq .. This is normally supplemented by a fourth gear for added strength, completing the square.