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

The components of the Ever-Power differential are demonstrated in the Figure. The energy from the tranny is sent to the bevel ring equipment by the drive-shaft pinion, both which are kept in bearings in the rear-axle casing. The case can be an open boxlike structure that’s 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 straight road the wheels and the medial side gears rotate at the same acceleration, there is no relative motion between the differential aspect gears and pinions, and they all rotate as a unit with the case and ring gear. If the vehicle turns left, the right-hand wheel will be forced to rotate faster than the left-hand wheel, and the medial side gears and the pinions will rotate in accordance with each other. The ring gear rotates at a acceleration that is add up to the mean quickness of the left and right wheels. If the tires are jacked up with the tranny in neutral and among the tires is turned, the opposite wheel will submit the opposite path at the same velocity.

The torque (turning minute) transmitted to the two 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 wheel is decreased. This disadvantage can be overcome somewhat by the use of a limited-slip 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 can be resisted by the clutch, hence providing greater torque for the various other wheel.
A differential in its most basic form comprises two halves of an axle with a equipment on each end, connected together by a third gear making up three sides of a sq .. This is normally supplemented by a fourth gear for added strength, completing the square.