![]() ![]() ![]() Spur-gear design Spur-gear differentialĪ spur-gear differential has an equal-sized spur gears at each end, each of which is connected to an output shaft. An illustration of the operating principle for a ring-and-pinion differential is shown below. The purpose of a differential is to transfer the engine's power to the wheels while still allowing the wheels to rotate at different speeds when required. However, for improved cornering abilities, many vehicles use a differential, which allows the two wheels to rotate at different speeds. Some vehicles (for example go-karts and trams) use axles without a differential, thus relying on wheel slip when cornering. This is easily accommodated when the wheels are not connected, however it becomes more difficult for the drive wheels, since both wheels are connected to the engine (usually via a transmission). Use in wheeled vehicles Purpose 1937 film about how differentials functionĭuring cornering, the outer wheels of a vehicle must travel further than the inner wheels (since they are on a larger radius). 1958: Vernon Gleasman patents the Torsen limited-slip differential, a design which solely uses gears (without any clutches, unlike many other types of limited-slip differentials).1897: While building his Australian steam car, David Shearer made the first use of a differential in a motor vehicle.1876: James Starley of Coventry invents chain-drive differential for use on bicycles invention later used on automobiles by Karl Benz.1874: Aveling and Porter of Rochester, Kent list a crane locomotive in their catalogue fitted with their patent differential gear on the rear axle. ![]() 1832: Richard Roberts of England patents "gear of compensation", a differential for road locomotives.1827: Modern automotive differential patented by watchmaker Onésiphore Pecqueur (1792–1852) of the Conservatoire National des Arts et Métiers in France for use on a steam wagon.1810: Rudolph Ackermann of Germany invents a four-wheel steering system for carriages, which some later writers mistakenly report as a differential.Its mechanism of action is unclear, though some 20th century engineers put forward the argument that it used a differential gear. 250 CE: Chinese engineer Ma Jun creates the first well-documented south-pointing chariot, a precursor to the compass. It was discovered in 1902 on a shipwreck by sponge divers, and modern research suggests that it used a differential gear to determine the angle between the ecliptic positions of the Sun and Moon, and thus the phase of the Moon. 100 BCE–70 BCE: The Antikythera mechanism has been dated to this period.Milestones in the design or use of differentials include: For example, many differentials in motor vehicles provide a gearing reduction by having fewer teeth on the pinion than the ring gear. Other uses include clocks and analog computers.ĭifferentials can also provide a gear ratio between the input and output shafts (called the "axle ratio" or "diff ratio"). A common use of differentials is in motor vehicles, to allow the wheels at each end of a drive axle to rotate at different speeds while cornering. Differential gears (in yellow) in a punched tape reader, built by Tally circa 1962Ī differential is a gear train with three drive shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |