Automotive Clutch - Part 01 | Summary and Q&A

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April 5, 2020
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NPTEL-NOC IITM
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Automotive Clutch - Part 01

TL;DR

This content provides an introduction to automotive clutches, their functions, and the different powertrain layouts.

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Questions & Answers

Q: What are the main functions of an automotive clutch?

The main functions of an automotive clutch are to provide a link between the prime mover and the transmission, allow for a smooth take up of drive when the vehicle is moved from rest, and enable brief disengagement between the engine and gearbox during gear changes.

Q: How does a friction clutch work?

In a friction clutch, the clutch plate is pressed against the flywheel by a pressure plate, creating friction and allowing torque to be transmitted from the engine to the gearbox. When the clutch is disengaged, a release bearing applies a force to the pressure plate, breaking the contact between the clutch plate and the flywheel, thereby disconnecting the engine from the gearbox.

Q: What are the different powertrain configurations in automotive vehicles?

The main powertrain configurations include front engine mounted rear-wheel drive, front engine mounted front-wheel drive, and rear engine mounted rear-wheel drive. These configurations vary in the orientation and location of the engine, gearbox, clutch, and final drive components.

Q: What are the challenges in moving a vehicle from rest with an internal combustion engine?

Internal combustion engines deliver very little torque at low speeds, making it necessary to have a move-off element, such as a clutch, to overcome the initial speed differential between the engine and the gearbox. The clutch enables a smooth transfer of torque, ensuring that all components rotate in synchronization.

Q: What are some common layouts for mounting an engine in a vehicle?

The engine can be mounted longitudinally or transversely. In a longitudinal layout, the engine's crankshaft axis aligns with the vehicle's longitudinal axis. In a transverse layout, the crankshaft axis is perpendicular to the longitudinal axis when viewed from the top. Different layouts have different applications and may require specific gearbox configurations.

Q: What is the purpose of a multi-speed gearbox in an automotive powertrain?

An IC engine's torque-speed characteristics do not meet the ideal traction requirements for a vehicle. A multi-speed gearbox is used to match the engine's output to the vehicle's requirements by providing different gear ratios, allowing the engine to operate more efficiently at various speeds and loads.

Q: What are the main components of a dry clutch?

The main components of a dry clutch include the clutch plate, pressure plate assembly, clutch fork, release bearing, and clutch housing. The clutch plate is pressed against the flywheel by the pressure plate, creating friction and enabling torque transfer. The clutch fork and release bearing are used to engage and disengage the clutch, while the clutch housing houses all the components.

Summary & Key Takeaways

  • The previous class focused on the components of the powertrain, torque characteristics of IC engines, and the need for a multi-speed gearbox to match engine output to a vehicle's requirements.

  • Today's class will cover move-off elements, specifically the clutch, which allows the vehicle to move from rest by enabling a smooth transfer of torque.

  • Different powertrain configurations include front engine mounted rear-wheel drive, front engine mounted front-wheel drive, and rear engine mounted rear-wheel drive, with variations in the orientation and integration of components.

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