The most common design of automatic transmissions is the hydraulic automatic, which typically uses planetary gearsets that are operated using hydraulics. The transmission is connected to the engine via a torque converter (or a fluid coupling prior to the 1960s), instead of the friction clutch used by most manual transmissions.
- Hydraulic automatics
The most common design of automatic transmissions is the...
- Continuously variable transmission (CVT)
A continuously variable transmission can change seamlessly...
- Dual-clutch transmission (DCT)
A dual-clutch transmission uses two separate clutches for...
- Hydraulic automatics
Most semi-automatic transmissions used in cars and motorcycles are based on conventional manual transmissions or a sequential manual transmission, but use an automatic clutch system. However, some semi-automatic transmissions have also been based on standard hydraulic automatic transmissions , with a fluid coupling or torque converter .
An automatic transmission shifts between gears by itself (except reverse gear, and a parking gear). A manual transmission needs the driver to decide when to shift gears. Manual transmission is also called standard transmission. This is confusing because almost all cars in the U.S. have automatic transmission.
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From Wikipedia, the free encyclopedia General Motors is an innovator of automatic transmissions, introducing the Hydra-Matic in 1940. This list includes some GM transmissions.
- Design and operation
- Usage in passenger cars
- Usage in motorcycles
- Usage in motor racing
- Usage in other vehicles
Semi-automatic transmission denotes a multi-speed motor vehicle transmission where part of its operation is automated, but the driver's input is still required to start from a standstill and to manually change gears. Most semi-automatic transmissions used in cars and motorcycles are based on conventional manual transmissions or a sequential manual transmission, but use an automatic clutch system. However, some semi-automatic transmissions have also been based on standard hydraulic automatic tran
Semi-automatics facilitate easier gear shifts by removing the need to depress a clutch pedal or lever at the same time as changing gears. Depending on the mechanical build, design, and age of the vehicle, they can use anything from, or a combination of hydraulic, pneumatic, or electric servos, solenoids, electrical sensors, electric switches, motors, processors, and actuators, to execute gear shifts when requested by the driver, typically when the driver moves or touches and moves the gearshift.
In 1901, Amédée Bollée developed a method of shifting gears which did not require the use of a clutch and was activated by a ring mounted within the steering wheel. One car using this system was the 1912 Bollée Type F Torpedo.
Prior to the arrival of the first mass-produced hydraulic automatic transmission in 1940, several American manufacturers offered various devices to reduce the amount of clutch or gear shifter usage required. These devices were intended to reduce the difficulty of operating the un
The Automotive Products Manumatic system, available on the 1953 Ford Anglia 100E was a vacuum-powered automatic clutch system that was actuated by a switch that was triggered whenever the gear lever was moved. The system could control the throttle cable and could vary the rate of
An early example for motorcycles was the use of an automatic centrifugal clutch in the early 1960s by the Czechoslovakian manufacturer Jawa Moto. This design was also used without Jawa's permission in the 1965 Honda Cub 50, which resulted in Jawa suing Honda for patent infringement. Eventually, Honda agreed to pay royalties for each motorcycle that used the Jawa design.
Semi-automatic transmissions in racing cars are typically operated by paddle-shift systems, which is connected to a designated Gearbox control unit. The first Formula One car to use a semi-automatic transmission was the 1989 Ferrari 640. This system used electro-hydraulic actuators, powered by hydraulic fluid, and electrical solenoids for controlling the clutch and shifting, and was operated by paddle shifters mounted behind the steering wheel. Another paddle on the steering wheel controlled the
Other notable uses for semi-automatic transmissions include: 1. During the 1940s to 1960s, many small diesels shunting locomotives used epicyclic semi-automatic transmissions. For example, the British Rail Class 03 and British Rail Class 04 used the Wilson-Drewry CA5 R7 transmission. 2. Sinclair S.S.S. Powerflow: Used from the 1950s to the early 1960s in Huwood-Hudswell diesel mining locomotives, the British Rail Class D2/7 and the British Rail Class D2/12. The Powerflow design is the layshaft-t
- Modern use
- Current fluids
- "Lifetime" Fluids
- Aftermarket Automatic Transmission Fluids
Automatic transmission fluid is a kind of transmission fluid used in vehicles with self-shifting or automatic transmissions. It is typically coloured red or green to distinguish it from motor oil and other fluids in the vehicle. The fluid is optimized for the special requirements of a transmission, such as valve operation, brake band friction, and the torque converter, as well as gear lubrication. ATF is also used as a hydraulic fluid in some power-assisted steering systems, as a lubricant in so
Modern ATF consists of a base oil plus an additive package containing a wide variety of chemical compounds intended to provide the required properties of a particular ATF specification. Most ATFs contain some combination of additives that improve lubricating qualities, such as anti-wear additives, rust and corrosion inhibitors, detergents, dispersants and surfactants; kinematic viscosity and viscosity index improvers and modifiers, seal swell additives and agents; anti-foam additives and anti-ox
Synthetic ATF is available in modern OEM and aftermarket brands, offering better performance and service life for certain applications. Oil pan of an automatic transmission with sedimented wear The use of a lint-free white rag to wipe the dipstick on automatic transmissions is advised so that the color of the fluid can be checked. Dark brown or black ATF can be an indicator of a transmission problem, vehicle abuse, or fluid that has far exceeded its useful life. Over-used ATF often has reduced l
The history of automatic transmission fluids parallels the history of automatic transmission technology. The world's first mass-produced automatic transmission, the Hydra-Matic 4-speed, was developed by General Motors for the 1940 model year. The Hydra-Matic transmission required a special lubricant GM called Transmission Fluid No. 1. for the Hydra-Matic Drive. This transmission fluid was only available at Oldsmobile, Pontiac, and Cadillac dealerships. Subsequent automatic transmission and fluid
In 1967, Ford produced the Type-F fluid specification. The Type-F specification was intended to produce a “lifetime” fluid which would never need to be changed. This was the first of many Ford “lifetime” fluids. The 1974 Ford Car Shop Manual reads "The automatic transmission is filled at the factory with "lifetime" fluid. If it is necessary to add or replace fluid, use only fluids which meet Ford Specification M2C33F. Many other transmission manufacturers have followed with their ...
For over 70 years, the oil aftermarket has produced both licensed, and non-licensed, formulations of automatic transmission fluids. Today, aftermarket fluids asserted by their manufacturers to be compatible for use in various brands of automatic transmissions continue to be sold under names such as Multi-Purpose and Multi-Vehicle fluids. Non-licensed fluid is typically less expensive; these fluids are not regulated or endorsed by the vehicle manufacturer for use in their transmissions. Vehicle m
The 2012-2016 DPS6 Powershift transmission was used in the 2012-2016 Ford Focus and 2011-2016 Ford Fiesta sedans. This transmission is the subject of a massive number of lawsuits alleging Ford lied in order to sell cars Ford knew had defective transmissions. 2008-present 6DCT450 Ford Powershift (MPS6) 6-speed wet clutch
Toyota Motor Corporation's A family is a family of automatic FWD/RWD/4WD/AWD transmissions built by Aisin-Warner.They share much in common with Volvo's AW7* and Aisin-Warner's 03-71* transmissions, which are found in Suzukis, Mitsubishis, and other Asian vehicles.
7G-Tronic is Mercedes-Benz's trademark name for its seven-speed automatic transmission, starting off with the W7A 700 and W7A 400 (Wandler-7-Gang-Automatik bis 700 oder 400 Nm Eingangsdrehmoment; converter-7-gear-automatic with 516 or 295 ft·lb maximum input torque; type 722.9) as core models.
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