An automatic transmission is a complex component in a vehicle that consists of several parts, each with a specific function. Here are the main parts and components found in an automatic transmission:

1. Torque Converter: The torque converter is a fluid coupling that connects the engine to the transmission. It allows the engine to continue running even when the vehicle is stopped.

2. Planetary Gear Sets: These gear sets are responsible for controlling the different gear ratios. They consist of sun gears, planet gears, and a ring gear.

3. Hydraulic System: Automatic transmissions rely on hydraulic fluid pressure to engage and disengage the gears. The hydraulic system includes a pump, valve body, and various hydraulic circuits.

4. Clutches and Bands: These are used to engage and disengage different gear sets within the transmission. Clutches are used for shifting gears, while bands are used to hold gears.

5. Transmission Control Module (TCM): The TCM is the brain of the automatic transmission, controlling the operation of the transmission based on input from various sensors.

6. Sensors: Sensors, such as speed sensors, throttle position sensors, and more, provide information to the TCM, helping it make decisions about gear changes and other functions.

7. Valve Body: The valve body is a crucial component of the hydraulic system. It contains valves, solenoids, and passageways that control the flow of hydraulic fluid to engage and disengage gears.

8. Governor and Modulator (if applicable): Some older automatic transmissions use a governor and modulator to control gear changes based on vehicle speed and engine load.

9. Oil Pan and Filter: Automatic transmissions have an oil pan that houses a filter to remove contaminants from the transmission fluid.

10. Cooler Lines: These lines carry transmission fluid to and from an external transmission cooler to maintain proper operating temperature.

11. Output Shaft: The output shaft connects the transmission to the vehicle's drive wheels, transferring power from the transmission to propel the vehicle.

12. Solenoids: Solenoids are electromagnetic switches used to control the flow of hydraulic fluid within the transmission.

13. Seals and Gaskets: Seals and gaskets are used to prevent leaks and ensure the transmission remains sealed.

These are the fundamental parts and components of an automatic transmission. The exact design and configuration of an automatic transmission may vary depending on the make and model of the vehicle, but these are the key elements you'll find in most automatic transmissions.

what parts in details contain automatic transmission

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Automatic transmissions are complex systems with various intricate components that work together to control the power delivery from the engine to the wheels. Here's a more detailed breakdown of the major parts and components found within an automatic transmission:

1. Torque Converter:

   • Impeller: Driven by the engine.

   • Turbine: Connected to the input shaft of the transmission.

   • Stator: Redirects the fluid to maximize torque output.

   • Lockup Clutch: Engages to create a direct mechanical link, improving efficiency.

2. Planetary Gear Sets:

   • Sun Gear: Central gear connected to the torque converter.

   • Planet Gears: Orbit around the sun gear.

   • Ring Gear: External gear that encircles the planet gears.

   • Carrier: Holds the planet gears in place.

3. Hydraulic System:

   • Hydraulic Pump: Driven by the engine, it pressurizes transmission fluid.

   • Valve Body: Controls fluid flow and houses various valves and solenoids.

   • Accumulators: Store and release hydraulic pressure for smooth shifts.

   • Fluid Cooler: Helps regulate transmission temperature.

4. Clutches and Bands:

   • Forward and Direct Clutches: Engage to produce forward movement.

   • Reverse Clutch: Engages for reverse gear.

   • Bands (e.g., Overdrive and Intermediate): Hold specific gears.

   • Clutch Packs: Sets of friction and steel plates engage and disengage to change gears.

5. Transmission Control Module (TCM):

   • Electronic control unit that manages the transmission's operation.

   • Receives input from various sensors to make decisions on gear changes.

6. Sensors:

   • Input and Output Speed Sensors: Monitor shaft speeds.

   • Throttle Position Sensor: Detects driver input.

   • Transmission Fluid Temperature Sensor: Monitors fluid temperature.

   • Transmission Range Sensor: Indicates the gear position.

   • Engine Control Module (ECM): Communicates with the TCM to coordinate shifting.

7. Valve Body:

   • Contains valves and passages to direct fluid flow for gear selection.

   • Includes solenoids to control specific functions, such as gear changes and lockup torque converter engagement.

8. Governor and Modulator (if applicable):

   • Older transmissions use these devices to control shift points based on speed and load.

9. Oil Pan and Filter:

   • The oil pan contains a sump where excess fluid collects.

   • The filter removes contaminants from the transmission fluid.

10. Cooler Lines:

• Carry transmission fluid to and from an external cooler to manage temperature.

1. Output Shaft:

   • Transfers power from the transmission to the vehicle's wheels.

2. Solenoids:

   • Electromagnetic switches control the flow of hydraulic fluid within the transmission.

3. Seals and Gaskets:

   • Ensure the transmission remains sealed and free from leaks.

4. Sprags (One-Way Clutches):

   • Allow power to be transmitted in one direction only, preventing reverse rotation.

5. Pump and Transmission Fluid:

   • The pump maintains fluid pressure, and the fluid itself is essential for lubrication and cooling.

6. Drive Chain (in some designs):

   • Transmits power from the torque converter to the planetary gear sets.

These components work together to regulate the transmission of power from the engine to the wheels, ensuring smooth and efficient vehicle operation. The exact configuration and design of an automatic transmission can vary by make and model, but these are the primary elements found in most automatic transmissions.