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Topic: Automatic transmission

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Transmission (mechanics)

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Torque converter

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Planetary gear

Tiptronic

CVT

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	Howstuffworks "How Automatic Transmissions Work"
		Just like that of a manual transmission, the automatic transmission's primary job is to allow the engine to operate in its narrow range of speeds while providing a wide range of output speeds.
		Without a transmission, cars would be limited to one gear ratio, and that ratio would have to be selected to allow the car to travel at the desired top speed.
		The key difference between a manual and an automatic transmission is that the manual transmission locks and unlocks different sets of gears to the output shaft to achieve the various gear ratios, while in an automatic transmission, the same set of gears produces all of the different gear ratios.
	auto.howstuffworks.com /automatic-transmission.htm (446 words)

	Mission - Automatic Transmission
		Similar to the manual transmission, the automatic transmission has several friction plates that are brought into contact with one another by the transmission to change the relative rotation rates (revolutions) between the second impeller and the vehicle's wheels.
		Continuously variable transmission (CVT) is an automatic transmission that uses a belt that connects two variable-diameter pulleys.
		CVT transmissions have better fuel efficiency because the transmission ratio is not changed by switching gears.
	www.edhelper.com /ReadingComprehension_33_177.html (571 words)

	Automatic transmission - Wikicars
		An automatic transmission is an automobile gearbox that can change gear ratios automatically as the car or truck moves, thus freeing the driver from having to shift gears manually.
		In recent years, automatic transmissions have significantly improved in their ability to support high fuel efficiency but manual transmissions are still generally more efficient.
		The predominant form of automatic transmission is hydraulically operated, using a fluid coupling or torque converter and a set of planetary gearsets to provide a range of torque multiplication.
	wikicars.org /en/Automatic_transmission (1775 words)

	Automatic Transmissions A Short Course on How They Work
		The modern automatic transmission consists of many components and systems that are designed to work together in a symphony of clever mechanical, hydraulic and electrical technology that has evolved over the years into what many mechanically inclined individuals consider to be an art form.
		The transmission oil pump (not to be confused with the pump element inside the torque converter) is responsible for producing all the oil pressure that is required in the transmission.
		If a late model transmission (computer-controlled transmissions started becoming popular in the early '90s) is not shifting properly, it is often the result of a computer sending incorrect signals due to a faulty sensor, or the transmission is not reacting to the computer command because of a bad connection or defective solenoid pack.
	www.familycar.com /transmission.htm (5276 words)

	Automatic transmission at AllExperts
		In recent years, automatic transmissions have significantly improved in their ability to support high fuel efficiency but manual transmissions are still generally more efficient.
		The predominant form of automatic transmission is hydraulically operated, using a fluid coupling or torque converter and a set of planetary gearsets to provide a range of torque multiplication.
		Automatic transmission families are usually based on Ravigneaux, Lepelletier, or Simpson planetary gearsets.
	en.allexperts.com /e/a/au/automatic_transmission.htm (1843 words)

	Automatic transmission
		Automatic transmission – for crawling in the slow lane or emergencies in the fast lane.
		Automatic transmission completely overcomes the problem, leading to a lower cost of operation and easier driving.
		Automatic transmission systems specified by Scania are based on well proven Allison units.
	www.scania.com /products/newtruckrange/transmission/automatic_transmission (253 words)

	Castrol Australia - Automatic Transmission Fluid (Site not responding. Last check: )
		Automatic transmission fluid formulated to satisfy the frictional characteristics, and wear resistance of the Ford M2C-33G specification to ensure transmission durability.
		Automatic transmission fluid developed for Mitsubishi, Hyundai, Kia and Proton vehicles to satisfy the friction requirements of their automatic transmissions, particularly those equipped with damper clutches.
		Automatic transmission fluid formulated to satisfy the GM 6297M specification (1975), and suitable for older automatic transmissions requiring a GM type fluid.
	www.castrol.com /castrol/multipleproductsection.do?categoryId=8000015&contentId=7000381 (245 words)

	Automatic Transmissions: What Makes Them Work
		The key to the modern automatic transmission is the torque converter.
		Gear shifting in an automatic transmission is very similar to the action taken while riding your mountain bike -- except that a series of valves, sensors, and other components take the place of your brain, deciding when to upshift and downshift to a larger or smaller gear.
		The transmission is connected to the wheels via an output shaft, which meshes to the axles in a variety of ways, depending on your car's design.
	www.edmunds.com /ownership/techcenter/articles/43836/article.html (1750 words)

	Audi Worldwide > Glossary > Automatic transmission tiptronic, 5-speed
		This automatic transmission has all of the same advantages and technical features (dynamic shift program (DSP), Keylock, Shiftlock) as the 4-speed automatic transmission (automatic transmission, 4-speed, with dynamic shift program).
		Tiptronic permits override of the automatic mode by moving the selector lever into a second shift gate and permits, for example, downshifting in twisting, downhill mountainous terrain to increase the braking effect of the engine or for a more sporty driving style.
		The continuous display of the gear selected in the instrument panel is just as much of a driving aid as the optional sport steering wheel or the multifunction leather-covered steering wheel which permits the hands to stay on the steering wheel.
	www.audi.com /audi/com/en2/tools/glossary/engine_driveline/automatic_transmission_tiptronic__5_speed.html (217 words)

	ATRA - Automatic Transmission Rebuilders Association devoted to automatic transmission repair
		ATRA is an international trade association for automatic transmission repair professionals, from coast to coast across North America.
		We are composed mainly of independent transmission repair facilities.
		to their automatic transmission repair and diagnostic services which better assists consumers with their automatic transmission repair complaints and concerns.
	www.atra.com (99 words)

	Diagnose Automatic Transmission
		Automatic transmissions are a mystery to most motorists.
		So if the transmission starts to slip, shift oddly, makes noise or misbehaves, most motorists do not have a clue as to what might be causing their problem -- nor do many technicians who are not transmission experts.
		Rebuilding automatic transmissions is an exact science that requires familiarity with the unit being rebuilt as well as the the correct parts, tools and specifications.
	www.aa1car.com /library/2002/bf90222.htm (2322 words)

	Daimler - Home - 7G-TRONIC: Mercedes-Benz Presents the World’s First Seven-Speed Automatic Transmission for Passenger ...
		The newly developed seven-speed automatic transmission reduces fuel consumption in the NEDC driving cycle by as much as 0.6 litres per 100 kilometres (depending on the car), increases acceleration from 0 to 100 km/h by up to 0.3 seconds and allows significantly quicker intermediate sprints from 60 to 120 km/h.
		These allow the automatic transmission to retain the small increases in engine speed which are important in ensuring optimum gear ratios, whilst at the same time offering a larger ratio spread between the lowest and highest gear.
		In contrast to conventional automatic transmissions, in which torque converter lockup is only possible in higher gears, the lockup clutch in the new seven-speed automatic transmission from Mercedes-Benz is active from the first gear up.
	www.daimlerchrysler.com /dccom/0-5-7153-1-65976-1-0-0-0-0-0-10748-7145-0-0-0-0-0-0-1.html (753 words)

	All World Knowledge - Automatic Transmission
		Both the automatic transmission and the manual transmission accomplish exactly the same thing, and are identical in every respect, except that they do it in totally different ways.
		Just like that of a manual transmission, the automatic transmission's primary job is to allow the engine to operate in its narrow range of speeds while providing a wide range of output speeds to drive the car in any direction you want, as long as it is forwards or backwards.
		Without a transmission, cars would be limited to one gear ratio, and that ratio would allow the car to travel at 80 mph, making the gear ratio similar to tenth gear in most manual transmission cars.
	www.allworldknowledge.com /auto_transmission/index.html (984 words)

	The legendary torqueflite automatic transmission
		The TorqueFlite transmission was Chrysler's mainstay from its introduction in 1956 through the early 1990s, remaining in duty in modified form (for front wheel drive) through 2001 in the Neon, and continuing even today with electronic controls for trucks.
		There is a Canadian transmission builder (Doug Miller of Fireball Performance Automatics in Williamsburg, Ontario) who has successfully converted these to shift via cable linkage as was the practice through 1965, thereby allowing owners of older MoPars to use this newer transmission and keep their pushbuttons.
		New for 1978 was a new lockup torque converter system for the TorqueFlite automatics, which, like its Packard and Studebaker predecessors, replaced the normal fluid interface in the transmission with a mechanical one.
	www.allpar.com /mopar/torqueflite.html (2896 words)

	automatic transmission problem
		Offers automatic transmission problem with a product or service that delivers automotive repair and automotive troubleshooting.
		Our site Offers automatic transmission problem with a product or service that delivers automotive repair and automotive troubleshooting.
		Lee Myles Offers automatic transmission problem with a product or service that delivers automotive repair and automotive troubleshooting.
	www.leemyles.com /automotive/automatic-transmission-problem.html (123 words)

	AUTOMATIC , Standard Transmission Repair, AUTOMATIC Standard Transmission Rebuild, AUTOMATIC Standard Transmission ...
		Each qualified automotive transmission repair technician at TUFF Transmissions understands that a Transmission repair problem can confuse most people.
		A reputable transmission repair facility will not quote to fix your Automatic Transmission based on a test drive around the block and a bunch of Computer Codes.
		At TUFF Transmissions we follow a set protocol to best serve our in customers' and provide correct and accurate diagnosis of their transmission problem, along with written estimates and options for repair.
	www.tufftransmissions.com /www/automatic-transmission/automatic-transmission.asp?veh=Automatic (731 words)

	Chrysler, Plymouth, and Dodge four-speed automatic transmission repairs
		One way to extend the life of any transmission is with a transmission fluid cooler and a deeper pan.
		Greg, a DCX tech, wrote that the AW4/AX4 transmission was used on 4.0L 6-cyl Jeep Cherokees through the end of their production, and on the first six-cylinder 1993 Grand Cherokees (built in 1992 and 1993), but on the Grand Cherokee it was phased out midway through the 1993 model year.
		Transmission Exchange said the computer should be retrained when a rebuilt transmission is put in.
	www.allpar.com /fix/trans.html (4605 words)

	How to check transmission and discover possible transmission problem when buying a used car. (Site not responding. Last check: )
		With the engine idling, transmission in "Park" (some car may have different procedure, refer to owner's manual) remove the automatic transmission dipstick and wipe it out with the clean cloth.
		One of the indications of a transmission problem is delayed engagement, when there is a long delay between the moment you shift the shifter into "D" (Drive) or "R" (Reverse) and the moment the transmission kicks in.
		If the transmission is extremely worn it may shift with quite a strong jerk, shudder or a delay (especially from first to second gear).
	www.samarins.com /check/transmission.html (1828 words)

	Automatic Transmission Fluid Additives (Site not responding. Last check: )
		Automatic transmission fluids are used in the transmissions of passenger cars, commercial vehicles, off-road trucks, mobile equipment and in non-transmission applications, such as power steering, small hydraulic pumps and farm applications.
		Automatic transmissions are changing in design from 5 to 6 speed and now even 7 speed capability, improving drivability and performance.
		Problems such as transmission shudder, poor shift feel and accelerated wear are becoming more common as drain intervals are increased.
	www.lubrizol.com /ATF/default.asp (392 words)

	AMSOIL Universal Synthetic Automatic Transmission Fluid
		AMSOIL Synthetic Universal Automatic Transmission Fluid is recommended for use up to 60,000 miles under severe service* and up to 100,000 miles under normal service* or according to the vehicle manufacturer recommended intervals, whichever is longer.
		Over 40 percent of total energy loss in an automatic transmission can be attributed to the act of pumping automatic transmission fluid to the transmission’s working components during transfer of power.
		The mechanical efficiency of an automatic transmission is directly affected by the viscosity of the transmission fluid.
	www.syntheticwarehouse.com /automatic_transmission_fluid.htm (1086 words)

	Manual & Automatic Transmission — Tech, Overview - Kit Car Magazine
		Jon McKean, director of operations for TPI Performance, builders of automatic transmissions, likes automatics for rear-wheel-drive cars and for cars that take on the dragstrip for "quarter-mile consistency." He said, "For street use, it is an issue of labor for the driver--the way traffic has increased.
		He said, "We sell lots of transmissions to kit car builders who understand that you put 15 to 20 percent more power to the ground in a manual than in an automatic, as there is very little parasitic loss in a manual trans system.
		A rebuilt automatic transmission is a good buy because it is less expensive, and a number of companies have produced bullet-proof rebuilt units for years.
	www.kitcarmag.com /techarticles/0311_manual_automatic_transmission_tech (2827 words)

	Car Talk Bulletin Boards: manual vs. automatic transmission (Site not responding. Last check: )
		If you use the average gas-burning V-6 for towing with a normal manual transmission, you are going to be working that clutch for slow-speed menouvers like normal acceleration and backing it in a driveway, in which case you might be better off with an automatic transmission.
		In this case, the automatic's torque converter would allow you to simply take your foot off the brake while in gear to move slowly.
		Towing with a manual transmission that was designed for towing is very different from towing with a typical car's manual transmission.
	www.cartalk.com /board/showflat.php?Cat=0&Number=317780&page=0&fpart=12&vc=1 (991 words)

	BMW Biturbo Petrol Inline Six Engine In Depth
		But at the same time the automatic transmission is always ready for any change in driving conditions, responding instantaneously and precisely to new demands and requirements, regardless of whether the driver wishes to slowly build up extra speed or whether he obviously wishes to accelerate fast and dynamically.
		Whether the transmission should shift back and, if so, to what degree, is determined by the electronic control unit applying data provided on load and driving conditions as well as the rate at which the driver presses down the gas pedal.
		The new six-speed automatic transmission therefore responds more quickly than the driver is even able to notice – all he feels is the spontaneous reaction to his commands and wish for dynamic acceleration.
	www.worldcarfans.com /news.cfm/newsID/2060426.001/page/5/country/gcf/lang/eng/bmw/bmw-3.0-litre-engine-in-depth (1725 words)

	Royal Purple Max ATF Automatic Transmission Fluid
		Automatic transmissions generate a great deal of heat and depend on the transmission fluid for cooling and protection.
		Max ATF significantly reduces heat to extend the life of your transmission and is recommended for all automatic transmissions requiring Ford Mercon® or GM Dexron® III transmission fluids.
		For manual transmissions and / or transfer cases specifying a Ford Mercon® or GM Dexron® type ATF, Royal Purple recommends either its Max ATF or for greater performance, its Synchromax.
	www.royalpurple.com /prodsa/matfa.html (369 words)

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