Spin-on Filter Concept for Future Engine and Vehicle Generations
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Spin-on Filter Concept for Future Engine and Vehicle Generations
AUTHORS
Dr.-Ing. Pius Trautmann is Director Engineering Liquid Filters at Mann+Hummel GmbH in Ludwigsburg (Germany).
Spin-on filters have proven themselves to be robust filters over decades in many areas of oil and fuel filtration. The filter change and in particular the removal of the spin-on filter requires force and is often only possible with the aid of a strap wrench or similar special tool. The bayonet lock developed by Mann+Hummel for the mounting of spin-on filters sets new standards for easy servicing and reduction of service costs.
Dipl.-Ing. Martin Postel is Manager Engineering Liquid Filters at Mann+Hummel GmbH in Speyer (Germany).
Dipl.-Ing. Michael Stehmeier is Development Engineer Liquid Filters at Mann+Hummel GmbH in Speyer (Germany).
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SPIN-ON FILTERS FOR INDUSTRY AND AUTOMOTIVE APPLICATIONS
For a long time, spin-on filters have been state of the art for engine-related filtration tasks. They are used as robust filter units for oil, hydraulic and fuel filtration. A spin-on filter consists of a sheet metal filter housing which closes with a solid thread cover. Using the thread cover, the spin-on filter is screwed onto the engine or filter head. The sealing is made with an axial seal which presses onto the surface area of the flange when the thread cover is screwed on. The sealing between the dirty and clean side of the filter is made via the screw thread. The filter element is located in the filter housing and the fluid to be filtered flows from the outside to the inside. Depending on the filtration requirements, the integration of all common types of filter media is possible: cellulose-based media, high performance media with glass fibers or synthetic fibers. The modular design of the filter also allows the integration of functions such as a bypass valve, antidrain membrane or check valve on the clean side. Spin-on filters are available in a wide range of sizes with diameters from 70 to 140 mm and lengths from 60 to 300 mm. The design is based on a modular system which enables the filter to be configured for different requirements through simple adjustments. In combination with standard filter heads, a filter system can easily be composed and an economic solution found, even for lower production volumes. The integration of additional functions as found in complex liquid filter modules requires a similar effort. During servicing, a disadvantage of the simple design becomes apparent. The axial seal means that the force required for disassembly is sometimes very high. A special wrench is often needed to unscrew the spin-on filter from the filter head or engine flange. The further development of this design which has proven itself and which has been optimized over decades represented a big challenge. The targets for the further development of the spin-on filter into a modern product were: –– quick removal and fitting of the filter during a service without the need for tools –– prevention of the mounting of nonapprove
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