Product category:
Gears, brakes, couplings and engines
News Release from: Schaeffler (UK) | Subject: Valvetrain systems for internal combustion engines
Edited by the Engineeringtalk Editorial
Team on 10 December 2007
Valvetrain technology explained
Since the introduction of multivalve technology in automotive engine building, there has been considerable progress in valvetrain technology.
Schaeffler UK has published a free pocket-sized, 70-page reference guide to the development, manufacture and application of the latest valvetrain systems for internal combustion engines The guide includes information on the development, manufacture and application of valvetrain systems and components for internal combustion engines, including the company's latest switchable and fully variable vale train systems, which help OEMs reduce vehicle fuel consumption and emissions
This article was originally published on Engineeringtalk on 14 Aug 2008 at 8.00am (UK)
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The book will be of interest to students, car mechanics, design engineers, mechanical engineers or drivers who wish to find out more about how their engine develops its power.
Since the introduction of multivalve technology in automotive engine building, there has been considerable progress in valvetrain technology.
Therefore, new terms are now being used that some engineers may find confusing: finger followers, tappets, hydraulic valve lash adjustment, variable and fully variable valvetrains, and so on.
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These engine components are responsible for supplying the engine with the necessary air for aspiration and for developing power.
This new technology has also significantly improved the performance of petrol and diesel engines in the last 20 years.
The guide covers the various valvetrain systems now available, including Schaeffler's own INA-branded systems, and the components these systems require.
In five concise chapters, the various basic valvetrain concepts are explained, including tappet valvetrains and rocker-type valvetrains, as well as the design, manufacture, testing and calculation of such systems.
The book concludes with a chapter on switchable and continuously variable valvetrains.
Fully variable valvetrains that have already reached volume production include BMW's Valvetronic system, which enables reductions in vehicle emissions and fuel consumption.
Engineers at the Schaeffler Group's Engine Systems Division have recently developed a fully variable valve control system which, in tests, reduced fuel consumption by 10% compared with conventional valvetrain systems.
A significant reduction in diesel engine NOx emissions was also achieved, as well as improved engine response and torque.
The INA UniAir (universal air) system is a cam-actuated, electrohydraulic valvetrain system, which is supplied by the vehicle's existing engine oil circuit.
The system can be used in both petrol and diesel engines and should be ready for volume production in 2009. Request a free brochure from Schaeffler (UK) ...
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