SMF - Oil Filters System
SMF has long been manufacturing high-quality oil filters for many large automobile and engine manufacturers—and of course the same machines produce identical filters for the aftermarket. This high level of quality has clear advantages: it ensures reliable function, good engine protection, and satisfied customers. The diversity of types is constantly increasing, however, as new engine architectures allow less and less space in the engine bay. Areas of application range from petrol and diesel engines for passenger cars and commercial vehicles to motorcycles and small engines. Because optimal lubrication of the bearings is extremely critical in all of these engines, all vehicle manufacturers require that oil filters be changed regularly.
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Downsizing (increasing engine output or reducing engine size), the use of turbochargers, stop-start technology, new fuels such as E10 or biodiesel—the requirements for engine oil and the oil filter are constantly increasing. Oil change intervals are also getting longer and longer—in part due to environmental protection. This means that oil filters must exhibit continuously improved performance and screen out dirt particles reliably for up to 50,000 km. At the same time, they need to offer less resistance to flowing oil and be smaller and lighter in weight. This is no simple task. Only the best materials and pleat geometries can meet these requirements. The pleats produce a large surface area required by the filter in order to retain a large amount of dirt and ensure sufficient oil flow.
This becomes difficult when oil become particularly thick in the cold of winter or the filter is already severely clogged. When starting the engine, the cold oil can generate up to 20 bar of pressure and flows very slowly through the filter. In this case, a pressure-relief valve is needed in order to send the oil on its way through the engine. Another valve ensures that the filter is filled with fresh oil every time the engine in started: the so-called anti-drain valve.
The cellulose is first impregnated with special resins in a complex process. This increases the stability of the pleats and prevents deformation. Then they are preheated, which prepares the paper for the forming process, known as embossing. Then the paper is pleated to meet requirements. The impregnation then needs to cure in order to give the paper mechanical strength as well as chemical and thermal resistance.
Filter mats are made from plastic fibres with thicknesses in the µm range: the finer the fibre, the better the filtration. These mats are designed in layers, and the density and fineness of the fibres increase from the dirty to the clean side. Known as the funnel effect, this allows a very high dirt-holding rate with low flow resistance.
Multilayer filter media combine non-woven and paper. Their production is complex, but in comparison with conventional paper filters they hold over 40 per cent more dirt with comparable separation efficiency.
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