The e-Valve system developed by Valeo, a French automotive supplier, uses electromagnetic controls to open and shut valves instead of pushrods operated by a camshaft.
Increasingly, employees can personalise their page, so that if they are working in the marketing department they do not receive a deluge of news clippings on camshaft design.
The camshaft, which opens and closes the valves, is driven from the crankshaft by a chain drive or gears on the front end of the engine.
For this reason, the overhead-camshaft engine is quite popular.
A gear, chain, or belt compartment for the camshaft drive from the crankshaft is formed between the front or rear end of the block and a cover plate.
Located immediately above the valves, this type of camshaft is driven either by a vertical shaft and bevel gears or by a cog belt.
To admit the gasoline air mixture to the cylinders and exhaust the burned gases, valves are used; these are opened and closed by the wedging action of cams (projections) on a rotating camshaft that is driven from the crankshaft by gears or a chain.
A passage bored lengthwise in the block houses the camshaft that operates the valves.
Because one turn of the camshaft completes the valve operation for an entire cycle of the engine and the four-stroke-cycle engine makes two crankshaft revolutions to complete one cycle, the camshaft turns half as fast as the crankshaft.
The big news is the new 2.0-litre EcoBoost petrol engine, which uses a turbocharger, direct fuel injection, and extremely variable camshaft timing to produce a lot of power and, even more useful, a lot of pulling ability while using remarkably little fuel.
The cams and the camshaft are usually formed as a unit, with the cams set at angles so as to open and close the valves in a prescribed sequence as the cams rotate.
