Overview
FrançaisABSTRACT
This paper describes automatic gearboxes with converters and continuously variable transmission. The former are being steadily improved for ever increasing quality of service. There are many designs for continuously variable transmission gearboxes. This paper describes two such designs that have been, or are being routinely manufactured: the belt variator and the toroidal variator. A comparison of the performance of the main types of transmission is outlined (manual gearbox, automated gearbox, double-clutch gearbox, automatic gearbox with converter, and continuous variation gearbox), emphasizing yield and fuel consumption.
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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
Since the early days of the automobile, gearbox-related inventions and patents have been numerous, and will continue to be so, as developments linked to hybridization and even full vehicle electrification go hand in hand with new gearbox architectures.
There are many different types of gearbox, often based on very different concepts, each claiming different qualities in terms of performance or comfort.
In our first article
In this article, we focus on converter automatics and continuously variable transmissions, two concepts that monopolize the market in the USA and Asia. Converter automatic transmissions as we know them today have been around since the middle of the last century. They are therefore a tried-and-tested concept, but one that is constantly being improved to meet ever-higher performance levels. Continuously variable gearbox concepts are numerous, but often less compatible with current technological and industrial constraints. We will therefore limit ourselves here to describing two concepts that are or have been in series production: the belt drive and the toroidal drive.
We also provide some comparative performance data for all the main types of transmission (manual gearbox, automated gearbox, dual-clutch gearbox, automatic converter gearbox and continuously variable transmission), focusing on efficiency and fuel consumption.
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KEYWORDS
automative transmissions | automatic transmissions | continuous variable tranmissions | car consumption | transmissions efficiency
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