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Question

Difficulty: EasyClutches and Transmissions

In vehicles equipped with an automatic transmission, which component uses fluid coupling to transfer rotational energy from the engine to the transmission input shaft?

  1. A
    Differential
  2. Torque converterAnswer
  3. C
    Brake master cylinder
  4. D
    Shock absorber

Answer

Torque converter
The torque converter serves as the hydrodynamic fluid coupling between the engine and the automatic transmission. It allows the vehicle to remain stationary while idling in gear and smoothly transfers torque to the transmission input shaft as engine speed increases.

Step-by-Step Solution

1
Identify the primary mechanism described in the question.
The question specifies a fluid coupling device in an automatic drivetrain that transfers engine power to the transmission input shaft.
Automatic transmissions use hydraulic fluid circulation rather than a dry friction disc to engage engine torque.
2
Select the component engineered for this hydrodynamic function.
The torque converter contains an impeller, turbine, and stator that circulate fluid to transmit rotational torque.
The engine drives the impeller, which pushes transmission fluid against the turbine splined to the transmission input shaft.

Key Concept

Hydraulic torque converter operation in automatic transmissions
Estimated Time:45s
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Topics

Clutches and Transmissions

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