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 components of the Ever-Power differential are demonstrated in the Figure. The energy from the tranny is delivered to the bevel ring gear 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 band gear possesses bearings to support one or two pairs of diametrically opposing differential bevel pinions. Each wheel axle is attached to a differential side equipment, which meshes with the differential pinions. On a directly road the wheels and the medial side gears rotate at the same speed, there is absolutely no relative motion between the differential part gears and pinions, plus they all rotate as a unit with the case and band gear. If the automobile turns left, the right-hand steering wheel will be forced to rotate faster compared to the left-hand steering wheel, and the side gears and the Differential Gear pinions will rotate in accordance with one another. The ring equipment rotates at a swiftness that is add up to the mean quickness of the left and correct wheels. If the tires are jacked up with the transmission in neutral and one of the tires is turned, the contrary wheel will turn in the opposite direction at the same velocity.

The torque (turning minute) transmitted to both wheels with the Ever-Power differential may be the same. Consequently, if one wheel slips, as in ice or mud, the torque to the other steering wheel is reduced. This disadvantage can be overcome somewhat by the use of a limited-slide differential. In one edition a clutch connects among the axles and the ring gear. When one wheel encounters low traction, its tendency to spin is certainly resisted by the clutch, therefore 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, linked jointly by a third equipment creating three sides of a square. This is generally supplemented by a 4th gear for added strength, completing the square.