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Info: Biography, Pictures, Discography of all CDs & DVDs |
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| We deliver the easiest technology and the best selection of titles with the best service and best user experience.Go where your patrons go with easy digital media.Kirshbaum Joins OverDrive Board of DirectorsDecember 18, 2007: Download Audio Books Arrive at Nassau County LibrariesMore...The software is available for use on many devices, such as laptops, Pocket PCs, PDAs, and even Smartphones!We integrate your digital collection with your main library website, and all formats are available on a single platform.Partner Services (PDF, 236k).How To: Repair a hose
A ruptured hose can sideline a big truck on the spot.YOU choose which company gets your resumeStart your new career TODAY!Trucker users the best freight matching service on the Internet.Buying a new truck anytime soon?Read the newly updated and expanded Overdrive 2007 Spec Guide to figure out how to spec that new beauty...Polish truck beauty contests.Here, you can enjoy the fruits of their labor.Buy an Overdrive shirt or hat, or a Partner's in Business Manual!For other uses, see Overdrive.An overdrive is sometimes a separate unit that fits into the back of a gearbox, as with this Fairey unit.Overdrive can refer to two different things.It also refers to a combination of gearing inside a transmission or transaxle which results in the output speed being greater than the input speed.This left an unfulfilled need for a higher gear ratio for highway cruising, which was filled by the addition of separate overdrive units.This trend has rendered the overdrive a complex and obsolete solution to economy gearing in automobiles, and very few cars are fitted with them today, although they still appear on large trucks, where more gear ratios are always in demand.Usage
Generally speaking, overdrive (OD) is the highest gear in the transmission.Most automatic transmissions have three speeds and overdrive (fourth speed).Overdrive allows the engine to operate at a lower rpm for a given road speed.The automatic transmission automatically shifts from OD to third gear when more load is present.When less load is present, it shifts back to OD.It may also be advantageous to switch it off if engine braking is desired, for example when driving downhill.How an overdrive unit works
The overdrive consists of an electrically or hydraulically operated epicyclic gear train bolted behind the transmission unit.Thus the output shaft may be "overdriven" relative to the input shaft.In these cases, there is no separately identifiable "overdrive" unit.Newer vehicles have electronic overdrive in which the computer automatically adjusts to the conditions of power need and load.Overdrive in Europe
The vast majority of overdrives in European cars were manufactured by an English company called Laycock de Normanville (later GKN Laycock), which is now defunct, though an uprated version of this product is produced in the U.Laycock de Normanville employee trading as Overdrive Repair Services.The system was devised by an Englishman, named Captain Edgar de Normanville, through a chance meeting with a Laycock Products Engineer.De Normanville overdrives were found in vehicles manufactured by Ford, British Leyland, Jaguar, Rootes and Volvo to name but a few.Land Rover, which is still in production in America today.MGBs, the Ford Zephyr, early Reliant Scimitars, TVRs, and Gilberns.Opel, American Motors and Chrysler motorcars, and Ford Transit vans.Over a period of 40 years, Laycock Engineering manufactured over three and a half million overdrive Units, and over one million of these were fitted to Volvo motorcars.The system featured an oil pressure operated device attached to the back of the standard gearbox operating on the gearbox output shaft.Through a system of oil pressure, solenoids and pistons, the overdrive would drop the revs on whatever gears it was used on by a set amount of revs.For instance, the overdrive system applied to a Triumph TR5 operates on 2nd, 3rd and top gear.When engaged, the overdrive would drop the revs by approximately 450rpm.The advantages this had on fuel consumption was quite marked over long distances.Fuel economy and drivetrain wear
Using overdrive gearing, the car's engine RPM drops, reducing engine wear and normally saving fuel.One should refer to the car's owner's manual for the proper speed to run at overdrive.However, all engines have a range of peak efficiency; it is possible for the use of overdrive to keep the engine out of this range, thus cutting into any fuel savings from the lower engine speed.There is some debate on the overall efficiency of overdrive gearing, as it requires more moving parts than direct 1:1 drive, but most will agree that within the transmission, this effect is minimal.The other difficulty can be in the drive shaft rotation speed.Overall drivetrain reduction comes down to three basic factors: transmission gearing (including overdrive), differential gearing (in the axle), and tire size.The rotation speed problem comes into effect when the differential gearing is high ratio and an overdrive is used to compensate.The driveshaft is usually a hollow metal tube that requires balancing to reduce vibration and contains no internal bracing.The higher speeds on the driveshaft and related parts can cause heat and wear problems if an overdrive and high differential gearing (or even very small tires) are combined, and create unnecessary friction.The impetus is then to minimize overdrive use and provide a higher ratio first gear, which means more gears between the first and the last to keep the engine at its most efficient speed.This is part of the reason that automobiles have been coming with more gears in their transmissions.Also, it is why more than one overdrive gear is seldom seen in a vehicle except in special circumstances.In technology
2 In entertainment
2.Look up overdrive in Wiktionary, the free dictionary.In technology
Overdrive (mechanics), a part of automobile transmissions aimed at increasing fuel efficiency
FIRST Overdrive, the 2008 game for the FIRST Robotics Competition
Overdrive (music), the practice of forcing output of a guitar amplifier past maximum, resulting in distortion
Intel 80486 OverDrive, a CPU specifically designed for personal computer upgrades
Pentium OverDrive, a CPU specifically designed for personal computer upgrades
Overdrive Media Console, a proprietary .If an internal link led you here, you may wish to change the link to point directly to the intended article.All text is available under the terms of the GNU Free Documentation License.DRIVERS FIND THE BEST TRUCKING JOBS!Our clients need drivers, plain and simple.We work with companies that have some of the best pay and benefit packages available.Want the trucking opportunity of a lifetime?Mercer drives host charity auction...Will tolls be the price to pay to finish the massive job?...See what's possible when you break out of financial bondage...The Absolute Highest Horsepower Handling Overdrive you can buy!Splitting Performance and Overdrive Economy.For RV's, Trucks, Muscle Cars, Hot Rods, and Racing.GEAR VENDORS provides overdrive product to racing cars and trucks up to
2000hp and trucks towing heavy RV's up to 25,000lbs gcvw.With fuel costs high the overdrive can pay for itself in mileage and
engine wear reductions.GEAR VENDORS is one of few products that can work both sides of this equation for real performance
gains as well as consistent fuel consumption reductions.Splitting capability allows you to shift to a gear with more mechanical advantage than the next stock gear
in automatic transmissions and wide ratio manuals.And then shift to an overdrive final and reduce both rpm and torque to reduce the manufacture of HP when
steady cruising to improve fuel mileage and decrease wear on the engine and engine driven accessories.True OEM Quality
OEM means that new vehicles have come factory equipped with GEAR VENDORS as original equipment.GEAR VENDORS first started producing the DeNormanville planetary overdrive in 1979 there were no
American vehicles with overdrive.Only the import cars with manual transmissions had an overdrive gear.In 1981 we won our first Best Engineered award from SEMA (the largest
automotive aftermarket organization).Driving Green for the Earth
GEAR VENDORS has been manufacturing overdrives for 27 years.Green House gas
emissions became the buzzword they are today.GEAR VENDORS overdrive kits include
electronics that keep the vehicle in the optimum performing gear.AutoLaunch for both
manuals and automatics.Customer Service Guarantee
GEAR VENDORS makes the highest quality, most expensive overdrive you can buy.These factory reps can give you the
details of installation and use and send you photos, diagrams, and brochures for free.Based in Boston, Massachusetts, Overdrive Interactive's search engine marketing and online media and advertising programs allow our clients to quickly and efficiently open as well as widen their online marketing and branding channels using a full spectrum of online marketing strategies and tactics.Coupled with our creative services, we turn Internet traffic into solid leads, sales, and brand perceptions that truly drive sales and measurable growth.Our second core offering from our Boston headquarters is providing companies with a full complement of services that they need to launch, maintain, and optimize their online media and online advertising campaigns.Overdrive Interactive has the staff and technology solution to make things happen quickly and efficiently with the best possible outcome.Overdrive CEO Harry J.Your Success: At Overdrive Interactive, we believe that in order to create a successful online marketing and branding channel, your prospects journey from impression to sale needs to be modeled and created in a flexible environment that facilitates rapid testing, measurement, and ongoing optimization.Find out what it costs to put Overdrive Interactive to work for your company.Schedule a capabilities and case study presentation to see how Overdrive Interactive can help your company succeed and grow from the power and promise of search engine marketing and online media.Overdrive Interactive's CEO is a regular speaker on search marketing and online media for many top trade shows and associations. |
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