Reverse gearbox for automatic transmissions
A reverse gearbox for automatic transmissions (automatic transmissions) is a mechanism that allows the car to move in reverse. It is usually located separately from the main gearbox and is driven by a separate hydraulic or electric drive.
Operating principle
When the driver shifts the automatic transmission selector lever into reverse, the transmission electronic control unit (ECU) sends a signal to the reverse drive. The drive includes a clutch that connects the reverse gears to the transmission output shaft. This allows the car to move in reverse.
Design
A reverse gearbox typically consists of the following components:
*Planetary Gear: Consists of sun gear, planetary gears and carrier. The planetary gears rotate around a carrier, which is connected to the transmission output shaft.
* Friction: A device that connects and separates gears. When the clutch is engaged, the gears rotate together, transmitting power to the output shaft.
* Sensors: Sensors determine the position of the gears and the rotation speed of the output shaft, providing information to the ECU.
* Hydraulic or electric drive: Drives the clutch.
Advantages
* Convenience: Allows you to easily shift into reverse without having to manually change gears.
* Safety: Reduces the risk of accidents when reversing thanks to fast and smooth shifting.
* Efficiency: Optimizes transmission performance for reverse driving, improving fuel consumption.
Flaws
*Additional Costs: A reverse gearbox increases the cost of an automatic transmission.
* Complexity: Its design is more complex than that of a conventional automatic transmission, which can lead to higher maintenance costs.
* Space Restrictions: Reverse gearboxes may take up additional space under the hood.