Facts about Torque Converters

In a manual transmission, the engine is connected by a clutch to transmission. If this connection is not present, it would be impossible to stop the car without killing the engine. But, a car that has an automatic transmission does not need the clutch to disconnect transmission from the engine. The automatic transmission also needs something that can help the transmission come to a stop. The automatic transmission has a torque converter which disconnects the transmission from the engine.A torque converter is like a fluid coupling. It allows the engine to spin on its own without using the transmission.

Functions of a torque converter

  • The torque converter shifts power to transmission from the engine.
  • The torque converter isolates the engine from the load.
  • Torque converter drives the front pump.
  • It multiplies the output of the torque and transfers it to the transmission.

Working of the torque converter

PATC is a center that is actively engaged in providing better performance of the torque converter. It also explains the working of the torque converter which is separated into three stages as follows:

  • Stall: When the vehicle is at a stall condition, the turbine cannot rotate even if the engine applies power to the impeller. This condition occurs when the person driving the vehicle places his foot on the brake. At this point, the torque multiplies. When the driver moves its foot to the accelerator, the impeller moves faster, and it enables the turbine to move.
  • Acceleration: When the driver accelerates the vehicle the speed of the turbine increases. When the speed of the turbine begins to increase the multiplication of the torque reduces. The multiplication of the torque is comparatively less at acceleration as compared to the stall condition.
  • Coupling: When the turbine reaches the speed of approx 90% of the impeller that point is called the coupling. At coupling, the multiplication of the torque seizes completely. Lock up clutch comes in play when the turbine reaches the coupling point. The stator moves in the direction the same as impeller and turbine.

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