coupling China differential gear, in automotive mechanics, gear arrangement that permits power from the engine to be transmitted to a set 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 street. On a straight street the wheels rotate at the same rate; when turning a corner the outside wheel provides farther to move and can turn faster than the inner wheel if unrestrained.
The components of the Ever-Power differential are proven in the Figure. The power from the tranny is delivered to the bevel band equipment by the drive-shaft pinion, both which are kept in bearings in the rear-axle casing. The case can be an open boxlike framework that’s bolted to the ring gear possesses bearings to support a couple of pairs of diametrically opposing differential bevel pinions. Each steering wheel axle is mounted on a differential side equipment, which meshes with the differential pinions. On a straight road the tires and the side gears rotate at the same velocity, there is absolutely no relative motion between your differential side gears and pinions, plus they all rotate as a device with the case and band gear. If the vehicle turns left, the right-hand steering wheel will be required to rotate faster compared to the left-hand wheel, and the side gears and the pinions will rotate relative to one another. The ring gear rotates at a speed that is equal to the mean swiftness of the left and correct wheels. If the tires are jacked up with the tranny in neutral and one of the tires is turned, the opposite wheel will turn in the opposite direction at the same rate.
The torque (turning instant) 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 wheel is reduced. This disadvantage could be overcome relatively by the use 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 inclination to spin is definitely resisted by the clutch, therefore providing higher torque for the other wheel.
OPEN DIFFERENTIAL:
A differential in its most basic form comprises two halves of an axle with a equipment on each end, linked with each other by a third gear creating three sides of a sq .. This is generally supplemented by a fourth gear for added power, completing the square.