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Monday, 21 August 2017

HOW TORQUE CONVERTER WORKS


How make a automatic transmission vehicle idle?? We usually press brake to make idle to our manual transmission vehicle idle . What to do in automatic transmission vehicle ?? Is it automatic ??HOW TORQUE CONVERTER WORKS??

HOW TORQUE CONVERTER WORKS


It is the torque converter who helps to make idle our vehicles means engine will run but vehicle will not move . It also give the initial torque to vehicle to move. It converts the speed of engine to torque when needed , & also reduce the loss and moves vehicle in same speed when needed as well.

The torque is often seen is most complicated part of vehicle of today. It is however the very important part of automatic vehicle today .This explanation explains the theory behind this component . The first part is impeller. It has curve blades & is filled with fluid .when impeller spins the fluid thrown outwards due to centrifugal force caused by the rotation of impeller. The faster the Impeller rotates the higher the centrifugal forces develop. The turbine is situated opposite to the impeller. In fact we can say if impeller rotate by 180, the fluid flow from the impeller is directed over the blade surface so the turbine rotates. 


The blades colour in red is the impeller, the yellow one is turbine. Here we can see the yellow blades of turbine are much slower than impeller. Because for example torque conversion & energy loses between impeller & turbine take place.
HOW TORQUE CONVERTER WORKS

The fluid in the impeller is forced outwards due to centrifugal force & transmits the energy to the turbine. The turbine blade are installed & made in such the way that is to allows the fluid to flow to the inner part of turbine & in the impeller. From there the cycle repeat itself. This device is called as fluid coupling.



HOW TORQUE CONVERTER WORKS



When a engine is running but a vehicle is static, there no torque is converted. To convert the torque another special feature is necessary -the starter which is interposed between the impeller & the turbine. The fluid flows through the turbine through the stator. The stators curve blade turn the fluid flow at angle of almost 90*. The result is multiplication of torque where the fluid flows back more slowly. The impeller is mounted to the housing & housing is connected is to the engine. Consequently the impeller receives the mechanical energy produced by the engine. General torque converter use a lock up clutch. & turbine output shaft that connects the turbine to the transmission & runs the vehicle.



Torque converters have 3 stages of operations .The first place is called stop. This happens mainly in traffic .In this the engine applies power to the impeller but the turbine does not rotate because of  the driver presses the brakes. So the vehicle does not move.


Next the second phase is acceleration. This happens mainly when the traffic light turns green. The brakes removes & the drive presses the accelerator pedal. Consequently so the impeller rotates faster. There is a relatively loss differences between impeller & turbine speed. Under this condition the converter produces torque multiplication. For acceleration this torque multiplication is needed.

The 3rd phase is called coupling.  The vehicle moves first, the vehicle is moves approximately 90 of the speed of impeller. The torque multiplication is keyed. Now the torque converter is a simple fluid coupling.  Morden vehicle uses at this stage of operation a lock-up clutch to lock the turbine to the impeller. After that there is some losses i.e due to fluid drive .

BENEFITS


  •  It allows vehicles to come to a complete stop without stopping the engine, the torque converter actually gives your car more torque when we accelerate out of a stop. Modern torque converters can multiply the torque of the engine by 2-3 times. This effect only happens when the engine is turning much faster than the transmission.

WEEK POINTS


  • At higher speeds, the transmission catches up to the engine, eventually moving at almost the same speed. Ideally, though, the transmission would move at exactly the same speed as the engine, because this difference in speed wastes power. This is part of the reason why cars with automatic transmissions get worse mileage than cars with manual transmissions.

Image credit- Hemming motors, The Chronicle Herald, Mechanical Booster 


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