Trimis la data: 2010-06-17 Materia: Engleza Nivel: Facultate Pagini: 6 Nota: / 10 Downloads: 3
Autor: Dorobantu Gabriel Dimensiune: 14kb Voturi: Tipul fisierelor: doc Acorda si tu o nota acestui referat: 1 2 3 4 5 6 7 8 9 10
vezi mai multe detalii vezi mai putine detalii
Raporteaza o eroare
The motor car first appeared in Germany in 1885 when Karl Benz and Gottlieb Daimler, each working independently of the other, produced self-propelled vehicles powered by rear-mounted, petrol-fuelled single-cylinder engines. These were based on the stationary gas engine that used the four-stroke principle.The replicas of the originals that each engineer produced gave birth to the world's motor industry, although in 1896, France and not Germany became the world's largest manufacturer of motor vehicles. In 1891 a French engineer, Emile Levassor, transferred the engine of the Panhard et Levassor car from its established rear location to the front of the vehicle, from where it drove the rear wheels via a clutch and in-line gearbox.

The progressive Gottlieb Daimler soon produced, in 1893, a vertical two-cylinder in-line engine and Benz followed, in 1897, with a horizontally opposed twin in which the cylinders were in the same plane as the crankshaft. Panhard had introduced the in-line four in 1896 and this configuration soon outstripped all other types in popularity, most notably in the Henry Ford Model T, built between 1908 and 1927.

Over 15 million of these Fords were produced and their success helped America to consolidate its position, attained in 1906, as the world's largest manufacturer of motor cars. The United States dominated the industry until 1980, when it was overtaken by Japan.

Britain had lagged behind France and Germany in introducing the motor car, as its industry was stifled by the presence of the Locomotive Act of 1865. This required self-propelled vehicles to be limited to a speed of 3.2 km/h (2 mph) in towns and 6.2 km/h (4 mph) elsewhere. Originally, motor cars were required to be preceded by a man carrying a red flag but this stipulation was usually set aside following an amendment to the act in 1878.

As early cars were capable of at least 32 km/h (20 mph), Continental imports could not be practically or legally run on Britain's roads until 1896, when the Locomotive Act was modified. The speed limit was raised to a blanket 19 km/h (12 mph) and increased again, in 1904, to 32 km/h (20 mph).

Britain's motor industry therefore dates from 1896, although most manufacturers were initially only responsible for their vehicles' mechanical components. Bodywork, usually of the open type with only rudimentary weather protection in the form of a canvas hood, was the responsibility of coachbuilders, who had hitherto manufactured horse-drawn vehicles.

In 1904 the English Napier company had built the world's first usable six-cylinder car, although the costly straight-eight engine did not make any impact until after World War I. The more compact V8, in which four in-line cylinders were positioned in a V-shaped configuration, was popularized by the American Cadillac company in 1915. Its Lincoln rival was responsible for the world's first successful V12-engined car that dates from 1915. However, the V6 unit, pioneered by Lancia, did not arrive until 1950.

Q Saloon Bodies
Most cars were fitted with open, wooden-framed, hand-crafted steel or aluminium bodywork that was mounted on a separate chassis frame. Saloons were more expensive because they used more materials. It was not until 1925 that the American Essex company risked all by offering a closed car that sold for less than a touring vehicle. The gamble paid off and the rest of the motoring world soon followed suit.

  • pag. 1
  • pag. 2
  • pag. 3
  • pag. 4
  • pag. 5
  • pag. 6

Nota explicativa
Referatele si lucrarile oferite de au scop educativ si orientativ pentru cercetare academica.

Iti recomandam ca referatele pe care le downloadezi de pe site sa le utilizezi doar ca sursa de inspiratie sau ca resurse educationale pentru conceperea unui referat nou, propriu si original. te invata cum sa faci o lucrare de nota 10!
Linkuri utile
Programeaza-te online la salonul favorit Descarca gratuit aplicatiile pentru iOS si Android Materiale educative Jocuri Cele mai tari jocuri de pe net Referate scoala Resurse, lucrari, referate materiale pentru lucrari de nota 10
Toate imaginile, textele sau alte materiale prezentate pe site sunt proprietatea fiind interzisa reproducerea integrala sau partiala a continutului acestui site pe alte siteuri sau in orice alta forma fara acordul scris al Va rugam sa consultati Termenii si conditiile de utilizare a site-ului. Informati-va despre Politica de confidentialitate. Daca aveti intrebari sau sugestii care pot ajuta la dezvoltarea site-ului va rugam sa ne scrieti la adresa