Definition

1. Noun:
   • A torque converter is a type of fluid coupling used in automatic transmissions to transfer and multiply rotational force (torque) from the engine to the transmission. It uses hydraulic fluid to accomplish this, allowing a vehicle to come to a complete stop without stalling the engine.

Usage

• The torque converter is a key component that replaces the mechanical clutch found in manual transmissions.
• It operates automatically, requiring no driver input to engage or disengage power flow.
• Its primary functions are to allow the engine to idle while the vehicle is stopped, to multiply engine torque during initial acceleration, and to provide smooth power delivery.

Examples

• Noun:
  • A faulty torque converter can cause shuddering during acceleration.
  • Modern automatic transmissions use a lock-up clutch inside the torque converter to improve fuel efficiency at cruising speeds.
  • The mechanic diagnosed the problem as a failure of the torque converter.

Advanced Usage

• "Torque converter stall speed": A technical term referring to the maximum engine speed (RPM) a torque converter can reach while the output turbine is prevented from turning (e.g., when the vehicle's brakes are fully applied). This is a performance characteristic.
  • A higher stall speed torque converter is often used in performance vehicles for better off-the-line acceleration.

Variants and Related Words

• Fluid coupling (n): A broader term for a hydrodynamic device used to transmit rotating mechanical power. A torque converter is a type of fluid coupling that can also multiply torque.
• Hydraulic coupling (n): Another term for a fluid coupling, emphasizing the use of liquid (hydraulic fluid).

Synonyms

• Hydraulic torque multiplier: A descriptive synonym highlighting its function.
• Fluid drive unit: A general term for the component.

Related Phrases

• Lock-up torque converter: A specific design that includes a mechanical clutch to directly link the engine and transmission at certain speeds, eliminating slippage and improving efficiency.
  • When the lock-up torque converter engages, it feels like shifting into a higher gear.

Noun

1. converter for transmitting and amplifying torque (especially by hydraulic means)