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ABSTRACT
The transmission system is a vital organ in any combustion-engined vehicle. In 2020, 105 million transmission systems are expected to be produced, 35% more than in 2010. Today the world market is split evenly between manual and automatic transmissions (all types of each). This paper deals with three types of transmission: (i) manual gearboxes with ranging designs, and five or six gears, (ii) automated manual gearboxes based on existing manual gearboxes, and intended for low-end applications, and (iii) double-clutch gearboxes, which give the best trade-off between yield, adaptation and shift comfort. These use dry or wet clutches and hydraulic or electrohydraulic actuators, with different designs aiming to increase the number of gear ratios and span.
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Read the articleAUTHORS
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Elian BARON: Doctoral engineer - Powertrain expert, Renault Automobiles
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Philippe PESCAROU: Doctoral engineer - Powertrain Expert-Leader, Renault Automobiles
INTRODUCTION
All internal combustion engine vehicles are equipped with a mechanical component known interchangeably as a gearbox or transmission. The internal combustion engine, whatever its type, cannot propel the vehicle on its own.
We therefore prefer to speak of GMP (Groupe Moto-Propulsion), the mechanical entity which groups together the engine and transmission, and which largely determines the vehicle's performance, noise and fuel consumption...
If we look specifically at transmissions, we should first point out that there are many different types, virtually all dating back to the origins of the automobile, but it would probably be impossible, and indeed of little interest, to detail them all.
In this article, we restrict ourselves to the technical description of three concepts that are relatively close "cousins" in terms of architecture: the manual gearbox, the automated manual gearbox and the dual-clutch automatic gearbox. As a prelude, we'd like to give you a few points to help you better understand the context in which the global transmissions market is evolving.
Automatic transmissions with inverters and continuously-variable transmissions are covered in a separate article at
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KEYWORDS
automotive transmissions | manual transmissions | automated transmissions | dual-clutch transmissions
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