What is the purpose of differential gears?
What is the purpose of differential gears?
Differential gear, in automotive mechanics, gear arrangement that permits power from the engine to be transmitted to a pair of driving wheels, dividing the force equally between them but permitting them to follow paths of different lengths, as when turning a corner or traversing an uneven road.
What is a planetary gear differential?
An epicyclic differential can use epicyclic gearing to split and apportion torque asymmetrically between the front and rear axles. Epicyclic gears are also called planetary gears because the axes of the planet gears revolve around the common axis of the sun and ring gears that they mesh with and roll between.
Where the planetary gearbox is used?
1 INTRODUCTION. Planetary gear transmission (PGT) is widely used in the automobiles, helicopters and marine applications. PGT is more advanced than counter-shaft drive because of its higher torque-to-weight ratio, compactness and reduced noise.
What does the differential do?
The differential is a set of gears that transmits engine power to the wheels, while allowing them to turn at different speeds on turns. With front-wheel-drive (FWD), the differential is alongside the transmission inside a housing, and the unit is called a transaxle.
How does a differential gear work in a planetary gearbox?
As already mentioned, a differential gear is a special type of a planetary gearbox. One of the bevel gears on the wheel shafts can be regarded as a sun gear while the other bevel gear then corresponds in a figurative sense to the ring gear. Figure: Comparison of a differential gear with a planetary gear
What are the three parts of a planetary gears?
Planetary Gears. Planetary gears normally consist of three parts; A single sun gear at the center, an internal (ring) gear around the outside, and some number of planets that go in between. Generally the planets are the same size, at a common center distance from the center of the planetary gear, and held by a planetary carrier.
How is the gear ratio of a planetary carrier determined?
2: The ring gear is held stationary, the sun is the input, and the planetary carrier the output. But, the ring gear is not moving, so x- (D sun /D Ring )y = 0, and y=x/ (D sun /D Ring) So our gear ratio becomes x [1+1/ (D sun /D Ring )]/x, or simply 1+ (D Ring /D sun ).
What is the fundamental equation for differential gears?
Since a differential is a special type of a planetary gearbox, the relationship between the different rotational speeds can also be described by the fundamental equation for planetary gears ( Willis equation ):
What are the disadvantages of a planetary gearbox?
Some disadvantages of planetary gearboxes include: A need for constant lubrication, high bearing loads, inaccessibility, and complex design . How should I select my gearbox? There are several types of gearboxes manufactured world-wide. One of the major differences between individual gearboxes is their performance characteristics.
What is the purpose of the planetary gears?
A planetary gearbox is a gearbox with the input shaft and the output shaft aligned. A planetary gearbox is used to transfer the largest torque in the most compact form (known as torque density).
What is planet gear?
Planetary gear is the gear train composed of the gear (sun gear) which is fixed or rotates around the fixed center and the gear (planetary gear) rotates around the center which revolves around the sun gear. Pic 12.9 shows the simplest planetary gear.
What is a spur gear differential?
Spur-gear differential. A spur-gear differential has two equal-sized spur gears, one for each half-shaft, with a space between them. Instead of the Bevel gear, also known as a miter gear, assembly (the “spider”) at the centre of the differential, there is a rotating carrier on the same axis as the two shafts.
