Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Reexamination Certificate
1999-07-30
2001-03-27
Walberg, Teresa (Department: 3742)
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
Reexamination Certificate
active
06205964
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a damping device for movable masses, preferably for electromagnetic drive systems, especially for electromagnetic valve controls, operating without camshaft, of internal combustion engines, comprising at least one damping element that exerts a force which is oriented counter the direction of movement of the movable mass.
For electromagnetic valve controls, operating without camshaft, of internal combustion engines it is known to open the valve by the axlel of an armature. In the closing direction, the valve is spring-loaded. An armature is seated on the armature axle which can be moved in two directions by two coils. Starting from a central position, depending on the respective supply of electricity to a coil, the armature is then moved in the desired direction. The armature axle is secured by a spring force in abutment at the valve shaft. The pressure spring loading the armature axle is pretensioned such that in the current-free state of the electric drive the armature is maintained in the central position. Upon movement the armature will impact at high force and high velocity on the stops provided at the electric drive which results in a considerable noise pollution and also reduces the service life of the electric drive. The springs loading the armature axle or the valve stem present resistance to the armature axle and the armature. However, this resistance cannot be adjusted so high that the hard impact of the armature at the stops of the electric drive are dampened or reduced.
It is therefore an object of the present invention to embody a damping device of the aforementioned kind such that it operates at reduced noise level, has a long service life, and reliably and over a path as short as possible will reduce the movement to zero.
SUMMARY OF THE INVENTION
This object is inventively solved in that the damping element is provided in the form of a damping piston which delimits a pressure chamber into which at least one hydraulic supply line opens. Upon movement of the damping piston by the movable mass the hydraulic supply line is closed, while the hydraulic medium is displaced from the pressure chamber, so that within the pressure chamber a hydraulic pressure is generated.
In the inventive damping device the damping element is a damping piston which delimits a pressure chamber in which hydraulic medium is present. When the damping piston is moved by the moveable mass, the hydraulic medium is displaced from the pressure chamber until the flow cross-section of the hydraulic supply line is closed. Since upon movement of the damping piston the flow cross-section of the hydraulic supply line is reduced, with increasing stroke of the damping piston, the hydraulic pressure is increased in the pressure chamber so that in this manner the movable mass will encounter an increasing resistance. This provides for a high noise level damping as well as an increase of the service life of the damping device, respectively, of the drive system.
REFERENCES:
patent: 5022359 (1991-06-01), Erickson et al.
patent: 6076490 (2000-06-01), Esch et al.
patent: 6116570 (2000-09-01), Bulgatz et al.
Maisch Dieter
Tischer Dieter
Trzmiel Alfred
Hydraulik-Ring GmbH
Patel Vinod D.
Robert W. Becker & Associates
Walberg Teresa
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