Type of Gearbox in Automobile Vehicles [Explained in Detail] 2021

Summary

This educational video delves into the world of gearboxes, explaining their purpose and types used in modern vehicles. It covers the sliding mesh, constant mesh, synchromesh, and epicyclic gearboxes, detailing their construction, working principles, and how they facilitate vehicle speed changes and torque management. The video also highlights the benefits of synchromesh for smoother gear shifting and the unique features of epicyclic gearboxes in automatic transmissions.

Takeaways

• 🚗 The transmission is a device located between the clutch and the propeller shaft, serving to provide high torque during starting, hill climbing, accelerating, and pulling loads.
• 🔧 The gearbox is a type of transmission enclosed in a metal box that allows the engine to revolve at high speeds while the wheels turn at lower speeds.
• 🔄 There are four main types of gearboxes used in modern vehicles: sliding mesh type, constant mesh type, synchromesh gearbox, and epicyclic gearbox.
• 🔩 The sliding mesh type gearbox is the simplest, with gears arranged in a neutral position and connected by a shifter yoke when the gear lever is operated.
• 🔄 In a constant mesh gearbox, all gears on the main shaft are in constant mesh with the counter shaft gears, providing a safe and smooth gear engagement.
• 🌀 Synchromesh gearboxes use helical gears and synchromesh devices to synchronize the rotation of gears, eliminating gear clashing and making shifting easier.
• 🔧 Synchromesh devices are often fitted only on top gears, with the first and reverse gears sometimes lacking them due to their intended use when the vehicle is stationary.
• 🌐 The epicyclic gearbox is widely used in automatic transmission systems, featuring an epicyclic gear arrangement with sun, planet, and ring gears.
• 🔒 In epicyclic gearboxes, locking one gear allows the remaining two to act as input and output, providing a wide variety of speed variations.
• 🚗 Automatic transmission systems with epicyclic gearboxes do not require a clutch pedal or gear lever, simplifying the driving experience.
• 👍 The video concludes by encouraging viewers to share and subscribe for more engineering content, highlighting the educational value of the channel.

Q & A

What is the main purpose of a transmission in a vehicle?

The main purpose of the transmission in a vehicle is to provide high torque during starting, hill climbing, accelerating, and pulling a load. It also changes vehicle speed while keeping the engine speed within a certain limit.

What are the different types of gearboxes mentioned in the script?

The script mentions four types of gearboxes: sliding mesh type, constant mesh type, synchromesh gearbox, and epicyclic gearbox.

How does a sliding mesh type gearbox operate?

In a sliding mesh type gearbox, the gears are arranged in a neutral position, and the clutch gear is fixed to the clutch shaft. Gears can be slid into mesh by the shifter yoke, connecting them to the corresponding gears and reverse idler gear.

What is special about the constant mesh type gearbox?

In a constant mesh type gearbox, all the gears of the main shaft are in constant mesh with the corresponding gears of the counter shaft. This design is safe from damage and prevents unpleasant grinding sounds during gear engagement and disengagement.

How does a synchromesh device in a gearbox work?

A synchromesh device in a gearbox synchronizes the rotation of gears that are about to mesh, eliminating gear clashing and making gear shifting easier.

What is an epicyclic gearbox and where is it commonly used?

An epicyclic gearbox is a type of transmission where at least one gear rotates about its own axis and also about some other axis. It is most widely used in automatic transmission systems.

What are the components of an epicyclic gearbox?

An epicyclic gearbox consists of an epicyclic gear arrangement with three gears: sun gear, planet gear, and ring gear. The sun gear is mounted on the sun gear shaft, the planet gear on the planet carrier, and the ring gear on the planet carrier shaft.

How does the locking mechanism work in an epicyclic gearbox?

In an epicyclic gearbox, locking one gear allows the remaining two gears to act as input and output. For example, if the sun gear is locked, the ring gear and planet gear act as input and output.

What is the advantage of an epicyclic gearbox in terms of speed variation?

The advantage of an epicyclic gearbox is that it can achieve a wider variety of speed variations compared to other types of gearboxes.

What is the role of the reverse idler gear in a sliding mesh type gearbox?

The reverse idler gear in a sliding mesh type gearbox is fixed on another shaft and remains connected to the reverse gear of the counter shaft. It changes the rotation of the wheels from forward to backward, allowing the vehicle to move in the reverse direction.

How does the script describe the gear shifting process in a synchromesh gearbox?

The script describes the gear shifting process in a synchromesh gearbox as involving a synchromesh device that first takes the two gears to be engaged into frictional contact, adjusting their speed before engaging them easily.