Damping device for movable masses, preferably for electromagnetic systems

A damping device for an electromagnetic valve control of an internal combustion engine has a pressure chamber, a hydraulic supply line communicating with a first pressure chamber and supplying the pressure chamber with a hydraulic medium. A damping piston is positioned at one side of the pressure chamber and is moveable relative to the pressure chamber. A moveable mass acts on the damping piston. When the damping piston is moved in a first direction by the moveable mass from a rest position into the first pressure chamber, the hydraulic medium is initially displaced from the pressure chamber into the hydraulic supply line until the hydraulic supply line is closed off by the damping piston and a hydraulic pressure is generated in the pressure chamber to create a force acting counter to the movement of the moveable mass.

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What is claimed is:

1. A damping device for an electromagnetic valve control of an internal combustion engine, said damping device comprising:

a pressure chamber (15, 54, 55, 79, 82);

a hydraulic supply line (25, 60, 62, 80, 81) communicating with said pressure chamber (15, 54, 55, 79, 82) and supplying said pressure chamber (15, 54, 55, 79, 82) with a hydraulic medium;

a first damping piston (13) positioned at one side of said pressure chamber (15, 54, 55, 79, 82) and movable relative to said pressure chamber (15, 54, 55, 79, 82);

a moveable mass (5, 6, 47, 75, 37, 42) acting on said first damping piston (13);

wherein, when said first damping piston (13) is moved in a first direction by said moveable mass (5, 6, 47, 75, 37, 42) from a rest position into said pressure chamber (15, 54, 55, 79, 82), the hydraulic medium is initially displaced from saidpressure chamber (15, 54, 55, 79, 82) into said hydraulic supply line (25, 60, 62, 80, 81) until said hydraulic supply line (25, 60, 62, 80, 81) is closed off by said first damping piston (13) and a hydraulic pressure is generated in first pressurechamber (15, 54, 55, 79, 82) to create a force acting counter to a movement of said moveable mass (5, 6, 47, 75, 37, 42).

2. A damping device according to claim 1, wherein said moveable mass (5, 6, 47, 75, 37, 42) has a rest position in which said moveable mass (5, 6, 47, 75, 37, 42) is spaced from said first damping piston (13).

3. A damping device according to claim 1, wherein said first damping piston (13) has an end face (22) bordering said pressure chamber (15, 54, 55, 79, 82), wherein said end face (22) has a depression (23) providing communication between saidhydraulic supply line (25) and said pressure chamber (15, 54, 55, 79, 82) in said rest position of said first damping element (13).

4. A damping device according to claim 3, wherein said depression (23) has a cross-section widening in a direction toward said pressure chamber (15, 54, 55, 79, 82).

5. A damping device according to claim 3, wherein said first damping piston (13) has at least one control cross-section portion (30) positioned perpendicularly to central axis of said first damping piston (13) and at a spacing to said end face(22).

6. A damping device according to claim 5, wherein said control cross-section portion (30) is connected to said hydraulic supply line (25) when said first damping piston (13) is moved past a closing position in which said hydraulic supply line(25, 60, 62, 80, 81) is closed off.

7. A damping device according to claim 5, wherein said hydraulic supply line (25) has at least one throttle (32).

8. A damping device according to claim 7, comprising a receiving chamber (20) in which said first damping piston (13) is guided, wherein said throttle (32) is an annular gap between said first damping piston (13) and a wall of said receivingchamber (20).

9. A damping device according to claim 3, wherein said first damping piston (13) has a bore (85) having an opening at said end face (22) and having an opening at a mantle surface of said first damping piston (13).

10. A damping device according to claim 1, comprising a reservoir (18) for the hydraulic medium, wherein said first hydraulic supply line (25, 60, 62, 80, 81) is connected to said reservoir (18).

11. A damping device according to claim 1, further comprising a second damping piston (13) positioned at an end of said moveable mass (37, 42, 5, 6, 47, 75) remote from said first damping piston (13).

12. A damping device according to claim 11, wherein said first and second damping pistons (13) are mirror-symmetrically arranged relative to one another.

13. A damping device according to claim 1, further comprising a spring (14) acting on said first damping piston (13) in a direction counter to said first direction.

14. A damping device according to claim 13, wherein said moveable mass (5, 6, 47, 75) engages said first damping piston (13) after overcoming a free float spacing (27, FF) and entrains said first damping piston (13) against said spring (14) andagainst said hydraulic pressure in said pressure chamber so that said first damping piston (13) performs a damping stroke (DH).

15. A damping device according to claim 14, wherein said moveable mass (5, 6, 47, 75) entrains said first damping piston (13) farther after completion of said damping stroke (DH) so that said first damping piston (13) performs a relief stroke(EH) to release said hydraulic pressure in said pressure chamber (15, 79, 82).

16. A damping device according to claim 1, wherein said damping piston (13) has a first annular stay and a second annular stay (51, 52), wherein each one of said annular stays (51, 52) separates two hydraulic chambers (53-56) from one another.

17. A damping device according to claim 16, wherein each one of said first and second annular stays (51, 52) has at least one opening (57, 58) connecting said two hydraulic chambers (53, 54, 55, 56) separated by said annular stay (51, 52).

18. A damping device according to claim 16, wherein said damping piston (13) further comprises a third annular stay (65) positioned between said first and second annular stays (51, 52) and separating two neighboring ones of said hydraulicchambers (54, 55) from one another.

19. A damping device according to claim 1, wherein said damping piston (13) is a part of an armature axle (5) of an electric drive (1).

20. A damping device according to claim 1, wherein said damping piston (13) is slidably mounted on an armature axle (5) of an electric drive (1).