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Variomatic is the stepless, fully automatic transmission of the passenger car manufacturer DAF.
The final drive has two pulleys with moveable conical drums. The distance between the drums is controlled by the engine vacuum in the inlet manifold and engine RPM, through centrifugal weights inside the drums. Between the two pulleys runs a drive belt. As a result of change in the distance of the conical drums in both pulleys, the diameters and so also the reduction ratio changes continuously.
With the DAF 600 - 55 each rear wheel was propelled individually by a pair of conical drums and drive belt with the effect of a limited slip differential: if a drive wheel on slippery road revs up, the other wheel can still transfer the full torque. This results in unusually good traction characteristics, which were also a reason for successes of the DAFs in rallies. It was even used in a Formula 1 car, but it was only allowed to start in one race before it was banned since it gave an unfair advantage.
The Variomatic is also used in today's motorscooters. It is a standard part of all common scooters since 1985, and several companies such as Malossi, Polini, Doppler and Stage6 are offering tuning clutches and variomatic for most common 50, 70 and 125 cc scooters.
A version of the Variomatic called Transmatic is still made by Van Doorne's Transmissie b.v. in Tilburg, The Netherlands and Nissan Primera is offered with this transmission.
Today the Continuously Variable Transmission (CVT) works according to the same principle. Rather than rubber drive belts, the modern transmission is made much more durable by the use of steel link belts. The CVT is available in cars such as Audi, Honda and the MINI ONE and MINI Cooper.
Categories: Automotive transmission technologies | Automatic transmission tradenames |
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Driver contests seat belt ticket
South Idaho Press - Mar 14 10:04 AM A Paul man has taken the question of whether or not he is required to wear the seat belt in his pickup all the way to district court. Fifth District Judge John Melanson took the issue under advisement Friday after hearing both sides in an appeal filed by Larry D. Olson, 54, of Paul.Save
Don't Belt Me In, Paul Man Says
KIFI - Mar 12 5:16 PM PAUL, Idaho (AP) - A Paul resident is fighting in court so he can drive without a seat belt. Larry Olson was ticketed in May 2006 for speeding and not wearing a seat belt. He paid the speeding ticket, but is contesting the seat belt violation.Save
Seeking security, Dutch turn to Bible Belt
Reuters via Yahoo! News - Mar 12 8:54 PM Just 90 minutes' drive from Amsterdam and its temptations is a village so devout that swearing is banned, women refuse to wear trousers and the bank machine does not dispense cash on a Sunday.Save
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AP via Yahoo! News - Mar 14 11:51 AM Key U.S. and Iraqi officials on Wednesday issued cautiously optimistic reports one month into the latest drive to curb sectarian bloodshed in Baghdad but warned that months would pass before the operation could be labeled a success.Save
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Roberts closes out interviews
The Demopolis Times - 2 hours, 29 minutes ago DEMOPOLIS - The final round of interviews ended last night with two people who have strong ties to Black Belt communities. The evening started with William Holiday III, principal of Oxford High School. Holiday graduated the University of West Alabama and coached in Clarke and Marengo counties.Save
Daniels overcomes many obstacles
The Natchez Democrat - Mar 14 10:57 PM VIDALIA For Finley Daniels, 88, it s been a long and challenging life. Daniels now lives at 103 Pecan Way Drive in O Neal and Ross Assisted Living, though he seems not to need much assistance. He sits, stands, walks and eats on his own, with a walker for balance.Save
Lebanon man dies in car-motorcycle collision
The Springfield News-Leader - Mar 14 4:09 PM A Lebanon man was killed today in Laclede County when a car backed out of a private drive and struck his motorcycle, the Missouri Highway Patrol said. Lynn R. Smith, 42, died after he was ejected from his 2000 Harley-Davidson, which was struck by a 2005 Dodge Stratus driven by Alyssa A. Digman, 17, of Richland, a patrol report said. The accident occurred at 7:45 a.m. on Historic Route 66, 14 ...Save
Iraqi, U.S. Officials Upbeat on Security
RedNova - Mar 14 11:20 AM By KIM GAMEL BAGHDAD - Key U.S. and Iraqi officials on Wednesday issued cautiously optimistic reports one month into the latest drive to curb sectarian bloodshed in Baghdad but warned that months would pass before the operation could be labeled a success. Maj. Gen. William B.Save
Students come to Pine Belt to volunteer
Hattiesburg American - Mar 14 4:31 AM While their peers bask in the Hawaiian sunlight or revel in a week free of homework and responsibilities, many students are busy building roofs, putting up drywall and landscaping.Save
Last Update: 2007-03-15 05:57:58
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