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2020 | Book

Historical Evolution Read chapter Read first chapter

The Automotive Chassis

Volume 1: Components Design

Authors: Dr. Giancarlo Genta, Lorenzo Morello

Publisher: Springer International Publishing

Book Series : Mechanical Engineering Series

Part of: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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About this book

This textbook draws on the authors’ experience gained by teaching courses for engineering students on e.g. vehicle mechanics, vehicle system design, and chassis design; and on their practical experience as engineering designers for vehicle and chassis components at a major automotive company.
The book is primarily intended for students of automotive engineering, but also for all technicians and designers working in this field. Other enthusiastic engineers will also find it to be a useful technical guide.
The present volume (The Automotive Chassis – Volume 1: Component Design) focuses on automotive chassis components, such as:• the structure, which is usually a ladder framework and supports all the remaining components of the vehicle;• the suspension for the mechanical linkage of the wheels;• the wheels and tires;• the steering system;• the brake system; and• the transmission system, used to apply engine torque to the driving wheels.
This thoroughly revised and updated second edition presents recent developments, particularly in brake, steering, suspension and transmission subsystems. Special emphasis is given to modern control systems and control strategies.

Table of Contents

Frontmatter

Wheels, Structures and Mechanisms

Frontmatter
Chapter 1. Historical Evolution
Abstract
It is always arduous to decide if historical notes should come before or after the description and the interpretation of the state of the art.
Giancarlo Genta, Lorenzo Morello
Chapter 2. Wheels and Tires
Abstract
Vehicle wheels have essentially two functions: to carry on the vehicle weight by exchanging vertical forces with the road surface; to exchange with the road surface longitudinal and side forces, able to move the vehicle and to control its path. As we have seen in the previous chapter the first function was already present on antique wheels that had to carry weights but only occasionally were demanded to brake the vehicle or to withstand significant side forces. With speed increasing the bearing capacity for side and longitudinal forces becomes more and more important.
Giancarlo Genta, Lorenzo Morello
Chapter 3. Suspensions
Abstract
For vehicle suspensions we mean a mechanism which links the wheel to the body directly or to a frame fixed to the body.
Giancarlo Genta, Lorenzo Morello
Chapter 4. Steering System
Abstract
In the first case the kinematic constraint exerts all forces needed to modify the trajectory without any deformation, i.e. is assumed to be infinitely stiff and infinitely strong. A perfect kinematic guidance is therefore an abstraction, although it is well approximated in many actual cases.
Giancarlo Genta, Lorenzo Morello
Chapter 5. Braking System
Abstract
The braking system must accomplish three different jobs: to completely stop the vehicle; this function entails braking moments on the wheel as high as possible; to allow speed control, when the natural deceleration of the vehicle, due to mechanical friction and motion resistances is not enough; this function entails braking moments on the wheels not very high, but applied for a long time; to keep the vehicle stopped also on a slope.
Giancarlo Genta, Lorenzo Morello
Chapter 6. Control Systems
Abstract
This chapter is dedicated to control systems working on steering mechanism, brakes and elastic and damping elements of suspensions; sections are divided according to this classification.
Giancarlo Genta, Lorenzo Morello
Chapter 7. Chassis Structures
Abstract
Chassis structures are stressed by internal and external loads.
Giancarlo Genta, Lorenzo Morello

Transmission Driveline

Frontmatter
Chapter 8. Historical Evolution
Abstract
Gearbox and clutch, or other start-up devices used as alternative, are essential to obtain from a reciprocating internal combustion engine a driving torque suitable to traction.
Giancarlo Genta, Lorenzo Morello
Chapter 9. Manual Gearboxes
Abstract
Gearboxes are normally classified according to the number of gear wheel couples involved in the motion transmission at a given speed; in case of manual vehicle transmissions, the number of gear wheel couples to be taken into account is that of the forward speeds only, without consideration of the final ratio, even if integrated into the gearbox.
Giancarlo Genta, Lorenzo Morello
Chapter 10. Shifting Mechanisms
Abstract
Mechanical devices that enables the driver shifting the pair of gearing wheels in such a way as to obtain the desired transmission ratio, are called shifting mechanisms. They are called internal if they are contained in the gearbox casings; they are called external when they mounted partly on the gearbox, partly on the vehicle body and connect the gearshift lever with the internal shifting mechanisms.
Giancarlo Genta, Lorenzo Morello
Chapter 11. Start Up Devices
Abstract
In clutches friction is applied to transmit the torque between an input and an output shaft. It is built with three discs; two of them are connected to the engine crankshaft and one, between the other two, is connected to the gearbox input shaft. These discs are respectively named driving plates and driven plate.
Giancarlo Genta, Lorenzo Morello
Chapter 12. Synchromesh Unit
Abstract
Synchronizers function is to enable changing of meshing gears couple, on a moving vehicle without negative consequences on mechanical integrity and on interior noise. During synchronization the clutch must be disengaged.
Giancarlo Genta, Lorenzo Morello
Chapter 13. Differentials and Final Drives
Abstract
Sometime, the names of differential, transfer box and final drive are used imprecisely; in addition to that these mechanisms are sometime integrated in the same subsystem in almost all possible combinations. We try to introduce some definition to better clarify this issue.
Giancarlo Genta, Lorenzo Morello
Chapter 14. Shafts and Joints
Abstract
Transmission shafts are used to apply torque to those driven components whose rotation axis cannot be perfectly aligned with their driving counterpart.
Giancarlo Genta, Lorenzo Morello
Chapter 15. Automatic Gearboxes
Abstract
Opposite to manual gearboxes, automatic gearboxes show a wide diversity of technical solutions; this situation could demonstrate the fact that this gearbox doesn’t have reached his technical maturity yet.
Giancarlo Genta, Lorenzo Morello
Chapter 16. Design and Testing
Abstract
In this chapter we will discuss about design rules and procedures for those transmission components, we have not considered in previous chapters yet, and about test methods applied for validation and qualification.
Giancarlo Genta, Lorenzo Morello
Backmatter
Metadata
Title
The Automotive Chassis
Authors
Dr. Giancarlo Genta
Lorenzo Morello
Copyright Year
2020
Electronic ISBN
978-3-030-35635-4
Print ISBN
978-3-030-35634-7
DOI
https://doi.org/10.1007/978-3-030-35635-4

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