The Cushioning Groove for Solenoid Switching Valves - Concept and Theoretical Analysis
Sprache des Vortragstitels:
Englisch
Original Tagungtitel:
The 9th JFPS International Symposium on Fluid Power, Matsue 2014, Oct. 28-31, 2014
Sprache des Tagungstitel:
Englisch
Original Kurzfassung:
A proper cushioning of the spool and armature of a switching valve at the end stops is important for a high lifetime and
a low impact sound. Squeeze gap concepts are often employed. Oil between two basically parallel surfaces, which come
into contact and which form the mechanical end stop, provides an excellent damping mechanism. But this oil film may
exhibit high stiction forces, which cause a high response delay or even a total failure of the valve, unless cavitation in
the oil film limits the stiction force. A new cushioning concept based on a notched groove is presented in this paper. Its
basic functional principle is studied by compact mathematical models. The basic differences to squeeze gap cushioning
are worked out and basic dimensioning rules are derived. This concept overcomes the stiction force problem fully.
Forschungs-