Torque converter automatic transmission Nissan Note
Torque converter functions:
*Transmits power from the engine to the transmission.
* Serves as a fluid coupling for smooth starting and gear shifting.
* Acts as a hydrodynamic torque converter (4-speed automatic transmission only).
Design:
The Nissan Note automatic transmission torque converter consists of the following main components:
* Pump wheel: Driven by a motor and creates a flow of fluid.
* Turbine Wheel: Connected to the transmission input shaft and driven by fluid flow.
* Stator: The stationary element that directs the flow of fluid from the pump wheel to the turbine wheel.
* Overrun Clutch: Locks the torque converter at high speeds, allowing direct transmission.
Working principle:
When the engine is running, the pump wheel rotates and creates a flow of transmission fluid. The fluid flow hits the turbine wheel, causing it to rotate. Since the stator prevents the direct flow of liquid, it is forced to circulate inside the transformer. The circulating fluid creates a hydrodynamic force that is transferred from the pump wheel to the turbine wheel.
At low speeds, the force generated by the torque converter increases, resulting in more torque being transmitted to the transmission. As speed increases, the torque converter enters a lock-up mode in which a direct drive is established between the engine and transmission, bypassing the torque converter.
Types of torque converters:
Nissan Note is equipped with two types of torque converters:
* 3-speed automatic transmission: Torque converter with freewheel, without torque converter.
* 4-speed automatic transmission: Torque converter with freewheel and torque converter.
Main malfunctions of the torque converter:
*Transmission fluid leak
*Slippage or vibration when shifting gears
* Increased fuel consumption
* Automatic transmission overheating