Differential gear, in auto mechanics, gear arrangement that allows power from the engine to be transmitted to a set of generating 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 street. On a straight road the wheels rotate at the same swiftness; when turning a part the outside wheel has farther to move and will turn faster compared to the inner wheel if unrestrained.

The components of the Ever-Power differential are proven in the Figure. The energy from the transmission is delivered to the bevel band gear by the drive-shaft pinion, both of which are held in bearings in the rear-axle housing. The case is an open boxlike framework that is bolted to the band gear and contains bearings to support one or two pairs of diametrically opposing differential bevel pinions. Each steering wheel axle is attached to a differential side gear, which meshes with the differential pinions. On a straight road the wheels and the medial side gears rotate at the same swiftness, there is no relative motion between the differential side gears and pinions, and they all rotate as a unit with the case and ring gear. If the automobile turns left, the right-hand 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 one Differential Gear another. The ring gear rotates at a acceleration that is add up to the mean swiftness of the remaining and right wheels. If the wheels are jacked up with the tranny in neutral and one of the wheels is turned, the opposite wheel will turn in the opposite direction at the same velocity.

The torque (turning minute) transmitted to the two wheels with the Ever-Power differential is the same. Therefore, if one wheel slips, as in ice or mud, the torque to the other steering wheel is reduced. This disadvantage could be overcome somewhat by the use of a limited-slide differential. In one edition a clutch connects one of the axles and the band gear. When one wheel encounters low traction, its inclination to spin is usually resisted by the clutch, thus 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, connected together by a third gear creating three sides of a sq .. This is usually supplemented by a fourth gear for added power, completing the square.