The BMW 740iL is part of the BMW 7 Series of cars. Called the E38 models, the E38 was the basis for the 1994 through 2001 740iL. Replaced by the E32 in 1995. The E38 models were offered with either a five-speed automatic or manual transmission; 740iL had a 5-speed ZF automatic standard. We have BMW 740iL Transmissions for sale, both manual and automatic.
The automatic transmission used in the 740iL model BMW is the ZF 5HP30. A 5 speed automatic overdrive transmission for rear wheel drive applications. A longitudinal mounted [rear wheel drive] engine and transmission setup, with a lock-up torque converter.
Called the AS5, it is an electronically controlled five speed automatic transmission using three planetary sets [Wilson gearing] three sets of rotating multiple-clutch plate discs, four brake clutches, two one way sprag clutches to offer reverse and 5 forward gears.
Major W. G. Wilson (1874–1957) was rewarded as one of the major co-inventors of the tank after World War One.[5] He had mainly been involved with the development of transmissions for tanks, particularly the problem of their steering gearbox. He had become an advocate for the benefits of the epicyclic gearbox, which allowed large torques to be transmitted whilst still being controllable through a small input force.[6] In June 1917, the first mock-up of the Mark V tank appears with the Wilson epicyclic steering gear. This was the first of the heavy tanks that could be driven by a single driver, without requiring him to signal orders inside to others working the brake levers.
Since 1900, the Lanchester Motor Company had built cars with manually controlled epicyclic gearboxes, first with a cone clutch, then with multi-plate clutches. These formed the ratio-changing gearbox of the transmission. In 1918, an experimental tank “Lanchester Gearbox Machine” or “Experimental Machine K” was tested, fitted with an epicyclic gearbox built by Lanchester.[7]
After the War, Wilson had a considerable reputation as an engineer of genius, particularly for gearbox design. In 1928 he patented his design for a novel pre-selective gearbox. Various manufacturers produced preselector transmissions under licence to the Wilson patents. One of the top manufacturers was a French company called Cotal. Wilson himself formed a partnership with J. D. Siddeley of the car maker Armstrong-Siddeley, first under the name of “Improved Gears Ltd.”, then later as “Self-Changing Gears Ltd.”.
As its name suggests, gear changes were made by selecting a gear ratio in advance of its being needed. The chosen gear was then brought into operation by pressing and releasing the ‘gear change pedal’, which was normally the left pedal, installed in place of the usual clutch pedal. It is not to be confused with automatic transmission, in that gear changing is initiated by the driver. Unlike the “crash” gearboxes of the first half of the 20th century, the gearwheels in a preselector box are permanently in mesh in an epicyclic layout.
On some cars, starting off from rest involved using the gear change pedal like a clutch. On others, first gear could be selected but while the engine was still idling the car would not move even after the gear change pedal had been pressed and released. When the accelerator was pressed a centrifugal clutch or fluid coupling would engage and the car would begin to move.
[edit] Use in cars* Armstrong Siddeley [8]
* Many Daimler models, notably the Daimler Double Six
* MG K-type
* Crossley…wiki
It has adaptive shift control, which allows for the computer module to adapt to different driving conditions. For instance, highway driving as opposed to city driving. It also has a fail-safe mode. It is designed to alert the driver of a transmission problem, hopefully having the problem fixed asap, thus saving money.
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