السلام عليكم
Leonardo da Vinci, in 1490, conceptualized a stepless continuously variable transmission. [1] The first patent for a toroidal CVT was filed in 1886. [2]
From the 1950s, CVTs have been applied to aircraft electrical power generating systems.
A CVT, called Variomatic, was designed and built by the Dutchman Hub van Doorne, co-founder of Van Doorne's Automobiel Fabriek (DAF), in the late 1950s, specifically to produce an automatic transmission for a small, affordable car. The first DAF car using van Doorne's CVT, the DAF 600,[1] was produced in 1958. Van Doorne's patents were later transferred to a company called VDT (Van Doorne Transmissie B.V.) when the passenger car division was sold to Volvo; it's CVT was used in Volvo 340.
The Ford Fiesta and Fiat Uno were the first mainstream European cars to be equipped with steel-belted CVT (as opposed to the less robust rubber-belted DAF design), in 1987.
In the 1980s and 1990s, the Subaru Justy was offered with a CVT. While the Justy saw only limited success, Subaru continues to use CVT in its keicars to this day, while also supplying it to other manufacturers.
Nissan first introduced CVT in the 1992 Nissan
.
After studying pulley-based CVT for years, Honda also introduced their own version on the 1995 Honda Civic VTi. Dubbed Honda Multi Matic, this CVT gearbox accepted higher torque than traditional pulley CVTs, and also includes a torque converter for "creep" action. The CVT is also currently employed in the Honda City ZX that is manufactured in India.
Toyota introduced the E-CVT in the 1997 Prius, and all subsequent Toyota and Lexus hybrids sold internationally continue to use the system (marketed under the Hybrid Synergy Drive name). Although sold as a CVT it is in fact not such a device as the gear ratios are fixed and the transmission is actually a Power Split Transmission (PST), allowing either the electric motor or the ICE (internal combustion engine) or both to propel the vehicle. The response of the complete system (under computer control) is similar in feel to a CVT in that the ICE speed is relatively low and constant under low power or high and constant under high power.
BMW used a belt-drive CVT as an option for the low and middle range MINI in 2001, forsaking it only on the supercharged version of the car where the increased torque levels demanded a conventional automatic gearbox. The CVT could also be manually "shifted" if desired with software simulated shift points.
General Motors designed a CVT for use in small cars, which was first offered in 2002. After just three years, however, this transmission will be phased out in favor of conventional planetary automatic transmissions.
Audi has, since 2000, offered a chain-type CVT as an option on some of its larger-engine models, for example the A4 3.0 L V6.
Ford introduced a chain-driven CVT known as the CFT30 — with a maximum torque capacity of 221 ft·lbf (300 N·m) — in their 2005 Ford Freestyle, Ford Five Hundred and Mercury Montego. The transmission was designed in cooperation with German automotive supplier ZF Friedrichshafen and was produced in Batavia, Ohio at Batavia Transmissions LLC (a subsidiary of Ford Motor Company) until 3/22/07. The Batavia plant also produced the belt-driven CFT23 CVT which went in the Ford Focus C-MAX and Escape Hybrid and still produces the 4-speed automatic (CD4E) for the Ford Escape and Mazda Tribute. Ford also sold Escort (European version) and Orion models in Europe with CVTs in the 1980s and 1990s.
ZF Friedrichshafen supplied its belt drive VT-1 CVT unit to BMW for use in some versions of the European Mini Cooper.
The 2007 Dodge Caliber[3] and the related Jeep Compass employ a CVT using a variable pulley system as their optional automatic transmission.
Contract agreements were established in 2006 between MTD and Torotrak for the first full toroidal system to be manufactured for outdoor power equipment such as jet skis, ski-mobiles and ride-on mowers.[/COLOR]
هذا تاريخ نظام السي في تي
من صانعه الأول ... (مخترعه )
إلى أول شركه تبنته ( فولفوا 340 )
إلى أول سياره أدخلته لليابان (سوبارو) (وكان نجاحها محدود)
إلى أول شركه أنتجته في اليابان ونجحت فيه وانتشر بين سياراتها (
نيسان )
وبعدها هوندا سيفيك وهوندا سيتي ...( والجميع عارف أن هوندا سيتي متواجده بهذا النظام)
ولكن لسياره تعتبر ثانويه من هوندا ورغم تواجد هذا النظام لم يكن لها السمعه ولا القوه ...
يتبع
