Valves and valve actuation – Electrically actuated valve – Solenoid having plural coils
Patent
1996-11-04
1998-09-29
Lee, Kevin
Valves and valve actuation
Electrically actuated valve
Solenoid having plural coils
335266, F16K 3106
Patent
active
058136533
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Electromagnetically controlled actuators, in particular those used to actuate cylinder valves in internal combustion engines, are well known, for example from EP-A-0 043 426 and EP-A-0 197 357. However, these known structures have a specific unit weight and require substantial space, so that they cannot be used as actuators for cylinder valves for internal combustion engines of a modern design, in particular those with multivalve operation.
SUMMARY OF THE INVENTION
It is an object of the invention to simplify the design of the already known electromagnetic actuators and thus achieve a more compact, space-saving structure.
This object and other to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the electromagnetic actuator for operating a cylinder valve of an internal-combustion engine includes first and second spaced electromagnets having pole faces oriented toward one another; an armature arranged for reciprocating motion between the pole faces; and a connecting rod having a first rod part being in an abutting contact with a first side of the armature and being a component separate therefrom. The abutting contact is such as to prevent a torque transmission between the first rod part and the armature. The connecting rod has a second rod part which is rigidly affixed to a second side of the armature and extending towards the cylinder valve. There are further provided a first spring situated adjacent the first electromagnet externally thereof and arranged for urging the first rod part into the abutting contact with the armature for urging the armature away from the first pole face towards the second pole face; and a second spring situated adjacent the second electromagnet externally thereof and arranged for urging the armature away from the second pole face towards the first pole face. The first and second springs act oppositely such that in a de-energized state of the first and second electromagnets the armature is held by the first and second springs in an intermediate position between the pole faces of the first and second electromagnets.
It is advisable to provide that one spring element acts directly upon the armature and the other, oppositely working spring element acts upon the armature in the manner of a return spring via the setting element. This type of design makes it possible to effectively use the pole faces, which leads to a more compact shape for the actuator on the whole. It is another advantage of this configuration that if it is used, for example, as an actuator for a cylinder valve of an internal combustion engine, the cylinder valve, which constitutes the setting element, can be provided as before with a valve spring that is effective in the closing direction, and which simultaneously functions as one of the actuator spring elements that acts upon the armature of the actuator. For an embodiment of the invention, it is therefore advisable to have the spring elements arranged on the front of at least one of the electromagnets.
A particularly advantageous embodiment of the invention provides that the connecting rod is designed in parts, wherein one part is connected fixedly with the armature and the other part which faces away from the setting element, is connected to the coordinated spring element with a force transmitting connection to the armature. As a result of such a division of the connecting rod, the armature can perform a purely axial movement with the rigidly connected segment of the connecting rod, while the connecting rod segment connected to the spring element, for example when using a coil spring as spring element, can carry out the spring rotation that occurs during movement without influencing the armature. The connecting rod can be fixedly secured to the setting element.
An advantageous embodiment of the invention provides that the spring element facing the setting element is connected to an attachment on the setting element. The attachment is connected to the setting elem
REFERENCES:
patent: 1471861 (1923-10-01), Perrault
patent: 3882833 (1975-05-01), Longstaff et al.
patent: 4649803 (1987-03-01), Abel
patent: 4831973 (1989-05-01), Richeson, Jr.
patent: 4841923 (1989-06-01), Buchl
patent: 5548263 (1996-08-01), Bulgatz et al.
Esch Thomas
Pischinger Martin
Schebitz Michael
FEV Motorentechnik GmbH & Co. KG
Lee Kevin
LandOfFree
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