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Automatic transmission fluids have many performance-enhancing chemicals added to the fluid to meet the demands of each transmission. [ citation needed ] Some ATF specifications are open to competing brands, such as the common DEXRON specification, where different manufacturers use different chemicals to meet the same performance specification.
The transmission fluid will quickly overheat, not to mention the repeated impacts on the stator clutch (next topic). Also, overheating transmission fluid causes it to lose viscosity and damage the transmission. Such abuse can in rare cases cause the torque converter to leak and eventually stop functioning due to lack of fluid.
Cutaway view of a 2007 Toyota AA80E hydraulic automatic Typical gear selector for an automatic transmission. An automatic transmission (sometimes abbreviated AT) is a multi-speed transmission used in motor vehicles that does not require any input from the driver to change forward gears under normal driving conditions. The 1904 Sturtevant ...
The other disadvantage of Roto HydraMatic was the extreme oil pressures in the small 8" fluid coupling, which caused transmission leaks. All HydraMatic transmissions suffer some shift quality with today's ATF fluid. The original "Type A" fluid that these transmissions take is available only at O'Reilly Auto Parts.
The fluid specification for DEXRON-VI (J) was first used as the GM factory-fill automatic transmission fluid for the model year 2006. Roy Fewkes, GM Powertrain Staff Project Engineer and Chairman of the GM ATF/Driveline Lubricants Approval Committee patented the new DEXRON-VI (J) fluid composition under US Patent US8642519B2 [ 20 ] [ 21 ]
Fluid coupling on Transfluid's industrial transmission model KPTO. A fluid coupling consists of three components, plus the hydraulic fluid: The housing, also known as the shell [5] (which must have an oil-tight seal around the drive shafts), contains the fluid and turbines. Two turbines (fanlike components):