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US 4,762,095 AGranted
Device for actuating a fuel-exchange poppet valve of a reciprocating internal-combustion engine
AssigneeDr. Ing. h.c.F. Porsche Aktiengesellschaft
InventorsHans Mezger, Reinhard Konneker, Hans-Joachim Esch
Life of this patent
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Abstract
A fuel-exchange poppet valve of a reciprocating internal-combustion engine is actuated by two electromagnets that, in an alternating way, are energized periodically to attract an armature disk arranged between them. The armature disk is fastened at an armature that is coupled to a one-armed fuel-exchange poppet valve control lever. The control lever is pivotally moved back and forth against the spring tension of a torsional bar spring to open and close a poppet valve.
Claims18
A device for actuating a fuel-exchange poppet valve of a reciprocating combustion engine, comprising:
- a pivotable valve control lever having a first movable portion engageable with a poppet valve shaft of a poppet valve to move the poppet valve between open and closed positions in response to pivotal movement of the valve control lever about its bearing center;
- movable armature means connected to a second portion of the valve control lever;
- electromagnetic means for selectively moving the armature means to thereby forcibly pivotably move the valve control lever between respective open and closed positions of the poppet valve;
- and
- torsion bar spring means connected to the valve control lever for resiliently resisting movement of the valve control lever from an unstressed position of the torsion bar spring means toward both the respective open and closed positions of the poppet valve.
2 more elements
A device for actuating a fuel-exchange poppet valve of a reciprocating combustion engine, comprising:
- a pivotable valve control lever having a first movable portion engageable with a poppet valve shaft of a poppet valve to move the poppet valve between open and closed positions in response to pivotal movement of the valve control lever about its bearing center;
- movable armature means connected to a second portion of the valve control lever;
- electromagnetic means for selectively moving the armature means to thereby forcibly pivotably move the valve control lever between the respective open and closed positions of the poppet valve;
- and
- torsion bar spring means connected to the valve control lever for resiliently resisting movement of the valve control lever toward the respective open and closed positions of the poppet valve;
- wherein the first movable portion of the valve control lever is at a free end of the valve control lever, wherein the armature means is pivotally connected to the second position of the valve control lever by means of an armature pivotal connection disposed between the free end and a bearing center pivotal connection of the valve control lever at its opposite end, and wherein the torsion bar spring means has one portion fixed to the pivotal bearing center of the valve control lever and another portion fixed to a fixed vehicle engine part;
- and
- wherein the distance between the coupling joint of the armature to the longitudinal axis of the poppet valve is shorter than the distance between the coupling joint and the bearing center of the valve lever.
5 more elements
A device for actuating a fuel-exchange poppet valve of a reciprocating combustion engine, comprising:
- a pivotable valve control lever having a first movable portion engageable with a poppet valve shaft of a poppet valve to move the poppet valve between open and closed positions in response to pivotal movement of the valve control lever about its bearing center;
- movable armature means connected to a second portion of the valve control lever;
- electromagnetic means for selectively moving the armature means to thereby forcibly pivotably move the valve control lever between respective open and closed positions of the poppet valve;
- and
- torsion bar spring means connected to the valve control lever for resiliently resisting movement of the valve control lever toward the respective open and closed positions of the poppet valve;
- wherein the first movable portion of the valve control lever is at a free end of the valve control lever, wherein the armature means is pivotally connected to the second position of the valve control lever by means of an armature pivotal connection disposed between the free end and a bearing center pivotal connection of the valve control lever at its opposite end, and wherein the torsion bar spring means has one portion fixed to the pivotal bearing center of the valve control lever and another portion fixed to a fixed vehicle engine part;
- wherein the closing movement of the poppet valve is dampened by a hydraulic damping device;
- and
- wherein the damping device includes a damping sleeve that is fastened at an end face on the poppet valve shaft, an oil-filled damping cylinder equipped with damping disks, an oil inlet bore, and throttling gaps.
6 more elements
Dependencies are inferred from the claim text.