Pneumatic component for a control bearing

Abstract

An active pneumatic component for pneumatically controlling a hydraulic bearing includes an electrically driven oscillating membrane pump combined with a multiway valve into an integrated structural component, in such a way that an armature which activates the oscillating membrane also controls the valve functions of the multiway valve. The valve also containing the inlet and outlet valves of the pump.

1 . An active pneumatic component especially for pneumatically switching of a hydraulic bearing,  
       characterized by 
 a combination of an electrically driven oscillating membrane pump ( 3 ) and of a multiway valve ( 2 ) to an integrated component in such a way that an armature ( 15 ,  17 ) which activates the oscillating membrane ( 14 ) also controls the function of the multiway valve.  
 
     
     
         2 . Component according to  claim 1 ,  
       characterized by 
 an inlet ( 4 ) which opens to the ambient atmosphere and an outlet ( 5 ) which is switchable between one of the three switching states OPEN, CLOSED and PRESSURIZED.  
 
     
     
         3 . Component according to one of the claims I or  2 ,  
       characterized by 
 a pumping chamber ( 13 ) provided in front of the pumping membrane ( 14 ) into which an inlet channel ( 6 ) and an outlet channel ( 11 ) open; a base ( 26 ) of a tappet ( 23 ) also extending into the pumping chamber ( 13 ) due to the restoring force of a pullback spring ( 10 ); a top of said tappet opening a relief valve ( 9 ) of the multi-way valve ( 2 ) located in the pumping chamber by pressing the base of the tappet ( 26 ) out of the pumping chamber ( 13 ) connecting the inlet ( 4 ) of the component ( 1 ) with its outlet ( 5 ); said base of the tappet ( 26 ) being pressed out of the pumping chamber ( 13 ) by the pumping membrane ( 14 ) or a dome-type impact portion formed on the pumping membrane especially for this purpose, whereby the pumping diaphragm is in a position which corresponds to the maximum stroke ( 22 ) of the pumping diaphragm.  
 
     
     
         4 . Component according to one of the claims  1 - 3 ,  
       characterized by 
 an upper stationary point of stroke ( 25 ) of the oscillating membrane ( 14 ) which under normal pump conditions is positioned underneath the lowest stopping surface of the base of the tappet ( 26 ) with respect to the direction of the operational stroke of the pump.  
 
     
     
         5 . Component according to one of the claims  1 - 4 ,  
       characterized by 
 a rest position of the deenergized pumping diaphragm ( 14 ) which is positively adjusted due to the restoring force of restoring springs ( 18 ,  19 ) and which corresponds to the lower stationary point of the stroke ( 20 ) of the oscillating membrane ( 14 ) whereby, when the pumping diaphragm is in its rest position, the outlet valve ( 12 ) disposed in the outlet channel ( 11 ) of the pumping chamber ( 13 ) is closed and therefore the outlet ( 5 ) of the component ( 1 ) is shut off.  
 
     
     
         6 . Component according to one of the claims  1 - 5 ,  
       characterized by 
 an electromagnetic driver activating the oscillating membrane ( 14 ) providing a piston like reinforcement at a plunger-type armature ( 15 ) in its axially central position, wherein said armature is supported in a currentless state of the magnetic coil ( 16 ) underneath the center of the coil and therefore in a position corresponding to the lower stationary point ( 20 ) of the stroke of the diaphragm by the restoring force of restoring springs ( 18 ,  19 ) acting on both sides of said piston ( 17 ) and which by energizing the coil with a constant current flow is shifted against the force of the restoring springs ( 18 ,  19 ) in a position ( 21 ,  22 ) corresponding to the maximum stroke of the piston to be stationary supported in this position and which in case of energizing the coil with direct current flow having rectangular pulses reciprocates in axial direction corresponding to the normal stroke of the oscillating membrane activating the membrane whereby the width of the rectangular pulses is chosen to be smaller than the width required to lift the diaphragm to its maximum stroke and the distance of the supplied rectangular pulses is chosen to correspond with the time of turning back of the diaphragm ( 14 ) to the lower stationary point ( 20 ) of the stroke.  
 
     
     
         7 . Use of the pneumatic component comprising features of one or more of the claims  1 - 6  for pneumatically switching of hydraulic bearings in motor vehicles, said bearings comprising a loose piece for uncoupling vibrations and a control chamber having a displaceable wall which is formed by the loose piece.