CARA KERJA TRANSMISI MATIC / AT PADA MOBIL / AUTOMATIC TRANSMISSION ( TEKNIK OTOMOTIF )

Summary

This video explains the workings of an automatic transmission system, focusing on three main components: the torque converter, planetary gear unit, and hydraulic control system. It illustrates how the torque converter uses fluid to transfer power from the engine, how the planetary gears adjust speed and torque, and how the hydraulic control system regulates shifts based on vehicle speed and engine load. The video breaks down the complex process of automatic gear shifting, offering a clear understanding of how these systems work together to ensure smooth and efficient driving performance.

Takeaways

• 😀 Automatic transmissions shift gears automatically based on accelerator input and vehicle speed, eliminating the need for a clutch pedal.
• 😀 The torque converter amplifies engine power and transfers it to the planetary gear unit using fluid dynamics.
• 😀 The planetary gear unit changes the speed and torque based on driving conditions, contributing to smooth shifts.
• 😀 The hydraulic control system manages the operation of the planetary gear unit and shifting process.
• 😀 The torque converter works by transferring engine power through fluid to a turbine runner, causing it to spin and transmit power.
• 😀 A key component of the torque converter, the stator, redirects fluid flow to increase torque output, especially at low speeds.
• 😀 The planetary gear system consists of multiple gears (sun gear, planet gears, and ring gears) that interact to provide varying gear ratios.
• 😀 By controlling which gears are engaged and which are locked, the planetary gear set can produce different outputs for acceleration or deceleration.
• 😀 Hydraulic pressure, generated by an oil pump, controls the shifting mechanism by engaging clutches and brakes in the transmission system.
• 😀 In a 3-speed automatic transmission, the system uses hydraulic pressure and clutch control to shift between gears based on vehicle speed and engine load.

Q & A

What is the primary function of an automatic transmission?

The primary function of an automatic transmission is to automatically shift gears based on the accelerator pedal pressure and vehicle speed, without the need for a clutch pedal.

How does an automatic transmission transfer engine power to the wheels?

An automatic transmission transfers engine power to the wheels through a torque converter, which strengthens the engine's power and passes it to the planetary gear unit, where the speed and torque are adjusted.

What are the main components of an automatic transmission system?

The main components of an automatic transmission are the torque converter, planetary gear unit, and the hydraulic control system.

What is the role of the torque converter in an automatic transmission?

The torque converter amplifies the engine's power and transfers it to the planetary gear unit through fluid motion, allowing for smooth gear shifts.

How does the fluid within the torque converter contribute to power transfer?

Fluid inside the torque converter flows through blades, transferring kinetic energy from the pump impeller to the turbine runner, which causes it to rotate and move the engine power forward.

What is the function of the planetary gear set in an automatic transmission?

The planetary gear set adjusts the speed and torque of the vehicle by using a combination of sun gears, planetary carriers, and ring gears. These components work together to provide different gear ratios, allowing the transmission to shift automatically.

What determines whether a gear in the planetary gear set will rotate or remain stationary?

The rotation of gears in a planetary gear set is determined by which gears are held stationary and which are allowed to rotate, governed by the hydraulic control system.

What is the role of hydraulic pressure in an automatic transmission?

Hydraulic pressure is responsible for activating various clutch assemblies and brakes, controlling the operation of the planetary gear unit and determining the gear shifts based on engine load and vehicle speed.

What does the hydraulic control system consist of?

The hydraulic control system consists of an oil pump that generates hydraulic pressure, valves that direct fluid flow, and fluid channels that control the operation of clutches, brakes, and the planetary gear set.

How does the governor pressure influence the shifting of gears in a 3-speed automatic transmission?

The governor pressure increases with vehicle speed and pushes specific valves, which open fluid channels to apply the appropriate brakes or clutches, thus determining the shift to the next gear in the 3-speed automatic transmission.