FR2811707A1 - ELECTROMECHANICAL ACTUATOR FOR ACTUATING A GAS CHANGE VALVE OF AN INTERNAL COMBUSTION ENGINE - Google Patents

Abstract

The invention starts from an electromagnetic actuator for actuating a gas change valve of an internal combustion engine, which has at least one electromagnet arranged in a housing, and with a device which has at least one channel, extending in at least one housing wall (10, 11), for the transport of a fluid. It is proposed that the housing wall (10, 11) has at least one three-dimensional stiffening forming (12, 13), and the three-dimensional stiffening forming (12, 13) forms at least part of the channel.

Description

The invention relates to an electromagnetic actuator for actuation

  of a gas change valve of an internal combustion engine, which has at least one electromagnet arranged in a housing, and with a device which has at least one channel, extending in at least one wall of

  housing, for transporting a fluid.

  DE 197 14 496 Ai discloses an electromagnetic actuator of the preamble type, for actuating a gas change valve of an internal combustion engine. In an actuator housing are arranged an opening magnet and a closing magnet each having a magnetic coil wound on a coil core. The magnets act on an armature capable of moving in the axial direction of the valve. In addition, the actuator comprises a cooling device having a cooling channel extending in the housing of this actuator. The cooling channel is produced by holes provided in the actuator housing. A coolant can be passed through the coolant channel, without this coolant coming into direct contact with the coils

  magnetic and coil cores.

  The invention aims to improve the actuator of the aforementioned type and, specifically, in particular from the point of view of the volume of construction, the weight and the manufacturing costs that can be achieved. The problem is solved according to the invention by the fact that the housing wall has at least one three-dimensional stiffening formation, and the three-dimensional rigidification forming forms at

minus part of the canal).

  Other embodiments result from the fact that:

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  - the housing wall is made at least partially in at least two layers, and the channel

is made between two layers.

  - The housing wall is formed at least partially from sheet metal. - the fluid is likely to be used for

  perform cooling and lubrication.

  - the fluid is guided by a connecting channel, from a first housing wall at least to a

second boot wall.

  - the electromagnet acts on a pivoting armature.

  the channel formed in the first housing wall is guided at least towards a first pivot point of a pivoting armature and the connecting channel is guided along a journal axis of the pivoting armature, at least up to at a second journal point located

  in the second housing wall.

  The invention starts from an electromagnetic actuator for the actuation of a gas change valve in an internal combustion engine, which has at least one electromagnet arranged in a housing and with a device which has at least one channel, s 'extending into at least one housing wall, to ensure the transport of a fluid. I1 is proposed that the housing wall has at least one three-dimensional stiffening forming and that this three-dimensional stiffening forming forms at least part of the channel. Thanks to the three-dimensional forming, the housing wall can be thin, not very bulky and light and this three-dimensional stiffening forming can advantageously be used to form a channel and precisely in particular a channel for cooling and / or lubrication fluid. We can avoid having

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  massive housing walls and expensive manufacturing processes, such as for example drilling processes, for arranging channels in walls

massive housing.

  The three-dimensional stiffening forming is advantageously carried out by a trough-shaped cavity or molding having a small width compared to the length, which can be isolated towards the outside in a simple manner from the construction point of view. In addition, it is possible with moldings to particularly stiffen the walls of the housing. It is however also conceivable to provide other forms which appear relevant to those skilled in the art for carrying out the three-dimensional forming of

stiffening.

  If we consider the housing per se, the channel can be opened and closed by a shutter component, attached to the housing wall, by

  example by a surface of a core of the electromagnet.

  The channel is however advantageously closed in the housing wall, making it possible to avoid having a leak in undesirable places, the tightness of the channels is checked before mounting the electromagnet and moreover any direct contact between the fluid passed through the channel, for example a special coolant, and the electromagnet can be avoided. Closed channels formed in the housing wall can be obtained in a particularly economical and simple manner, by forming the housing wall at least partially at least in double layer and by arranging the channel between two layers. The layers can be assembled by pressing with a form-fitting connection and / or be joined together by a connection by the material at least in the region of the channels, such as for example by brazing, welding, bonding etc.

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  The housing can be made from various materials which appear relevant to those skilled in the art, in particular a heat-resistant synthetic material. The three-dimensional stiffening formations can be formed in one piece, in a simple manner at the stage of

  manufacturing, in a plastic case.

  If the housing wall, however, is at least partially preferably made entirely of sheet metal, particularly thin wall thicknesses can be produced, which is cost-effective and three-dimensional stiffening moldings can be provided in sheet metal thicknesses by

  reforming processes or folding processes-

stamping, economical.

  If the fluid, intended for cooling and lubrication, is usable, for example by the fact that this fluid is formed by oil of the internal combustion engine, one can in addition save the fact of having to provide channels additional, manufacturing cost and other costs. The oil of the internal combustion engine can advantageously be used as a pressurized fluid, for example for a clearance compensating element. In particular, it is possible to economize on certain supply and discharge channels because the fluid has passed through a connecting channel from a first housing part at least to a second housing wall In principle, however, it is also possible to use the channel exclusively for a lubrication fluid or else for a special cooling fluid, by through which heat can be removed, for example

particularly advantageous.

  The solution according to the invention can be implemented for different actuators appearing to be

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  relevant to those skilled in the art. This, however, is particularly advantageous for actuators having a pivoting armature, which frequently are indirectly connected to a cylinder head and for which, thanks to the solution according to the invention, however, a supply of lubricating and / or cooling fluid can be produced. simple. With the solution according to the invention, it is also possible to carry out advantageously flexible channel guidance for

  actuators provided with a pivoting armature.

  If the channel formed in the first housing wall is guided towards a first pivot point of a pivoting armature and the connecting channel is guided along a bearing axis of the armature pivoting at least towards a second point swivel located in the second housing wall, it is advantageous to supply the two swivel points by means of a supply of cooling fluid and the connecting channel can be integrated of simple construction and compact from the point of view of construction, in the area of the journal axis, for example

  inside a bearing tube.

  Other advantages result from the description

  below drawings. An exemplary embodiment of the invention is illustrated in the drawing. The

  description and claims contain

  many features, in combination. Those skilled in the art will also appropriately consider the features individually and combine them to obtain other relevant combinations. In the drawings: FIG. 1 represents two electromagnetic actuators according to the invention in

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  a housing, seen obliquely from above, FIG. 2 represents a housing of the electromagnetic actuators of FIG. 1 without the electromagnets, seen obliquely from above, and FIG. 3 represents the housing of FIG. 2, seen

On top.

  Figure 1 shows two electromagnetic actuators 25, 26 arranged in a housing 27, for the actuation of two gas change valves not shown in detail, of an internal combustion engine. The electromagnetic actuators 25, 26 each have two electromagnets 19, 20, 21, only one electromagnet 21 of the second actuator 26 being visible. The electromagnets 19, 20, 21 each have a magnetic coil and a core. Between the two electromagnets 19, 20, 21 of each actuator 25, 26 is each time disposed a pivoting armature 22 by means of which the electromagnets 19, 20, 21 act on the gas change valves and

open and close them.

  The box 27 with three housing walls 10, 11, 30 made of sheet metal, precisely a bottom wall 30 with one layer and two side walls 10, 11 with two layers. Above the bottom wall 30 of the boot 27, the actuators 25, 26 are fixed to a cylinder head of the internal combustion engine. Two recesses 31, 32, surrounded by three-dimensional stiffening formations 33, 34 of circular shape which extend in the direction of the electromagnets 19, 20, are formed in the bottom wall 30, the recesses being connected by a three-dimensional forming 35 in the form of a rib, which also extends in the direction of the electromagnets 19, 20,

21 (Figures 2 and 3).

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  The housing walls 10, 11 delimit the electromagnets 19, 20, 21 laterally, are connected to the cores of the electromagnets 19, 20, 21 (for example welded, screwed etc.) and each time form two pivot points 23, 28, 24 , 29 for the two pivoting armatures 22, the journal axes of which are perpendicular to the valve axes of

gas change (Figure 2).

  Each time in a layer of outer sheet 14, 15 of the housing walls 10, 11 is formed a three-dimensional stiffening forming 12, 13 in the form of a molding or in the form of a chute, which forms hollow spaces for channels of the cooling device. and lubrication. The three-dimensional stiffening formations 12, 13 are produced from their depth in the direction opposite to the electromagnets 19, 20, 21 and are closed in a sealed manner in the direction of the electromagnets 19, 20, 21 transversely to the direction of flow, each time by a second layer of sheet metal 16, 17 of the housing walls 10, 11. The layers of sheet metal 14, 15, 16, 17 are each welded together, but can however be assembled by pressing, exclusively by using a bond by force interaction . The fluid transported in the channels can be formed by oil for the internal combustion engine, another fluid being however also possible. A molding-shaped forming 36 is formed in the bottom wall 30 and forms a supply channel in which the oil of the internal combustion engine is capable of being guided from the cylinder head, from a median zone of the wall of bottom 30, towards a channel formed in the first housing wall 10 and formed

  by three-dimensional stiffening forming 12.

  The three-dimensional forming 36 has been carried out since its

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  depth, in the direction of the electromagnets 19,, 21 and closed sealingly transversely to the direction of flow of the oil of the internal combustion engine by one side of the cylinder head cover. In the housing wall 10, the oil of the internal combustion engine is directed into a first branch 37 going to the first pivot point 23 of the pivoting armature 22 and into a second branch 38 going to the first pivot point 28 of the second pivoting armature not shown in detail. A third branch 39 is certainly filled with oil from the internal combustion engine, but is however used exclusively

  to stiffen the housing wall 10.

  The oil of the internal combustion engine is directed from the pivot points 23, 24 each time through a connecting channel 18 formed by a bearing tube 40, passing along the bearing axes of the pivoting armature 22, towards the second journaling points 24, 29 of this pivoting armature 22, from which the oil of the internal combustion engine is discharged towards the outside, via a channel formed by the three-dimensional stiffening forming 13, corresponding

  substantially to the housing wall 10.

Claims (7)

  1. Electromagnetic actuator for actuating a gas change valve of an internal combustion engine, which has at least one electromagnet arranged in a housing, and with a device which has at least one channel, extending in at least one housing wall, for transporting a fluid, characterized in that the housing wall (10, 11) has at least one three-dimensional stiffening formation (12, 13), and the three-dimensional rigidification forming (12 , 13) forms at least part of the channel.   2. electromagnetic actuator according to claim 1, characterized in that the housing wall (10, 11) is made at least partially in at least two layers, and the channel is formed between two layers (14, 15, 16, 17).   3. electromagnetic actuator according to claim 1 or 2, characterized in that the housing wall (10, 11) is formed at least partially in jail.   4. Electromagnetic actuator according to one   any of the preceding claims, characterized   in that the fluid is likely to be used   for cooling and lubrication.   5. Electromagnetic actuator according to one   any of the preceding claims, characterized   in that the fluid is guided by a connecting channel (18), from at least a first housing wall (10) to a second wall bootmaker (11).   6. Electromagnetic actuator according to one   any of the preceding claims, characterized 1 0 2811707   in that the electromagnet (19, 20, 21) acts on a pivoting armature (22).   7. Electromagnetic actuator according to   claims 5 and 6, characterized in that the channel   formed in the first housing wall (10) is guided at least towards a first pivot point (23, 28) of a pivoting armature (22) and the connecting channel (18) is guided along an axis of swiveling of the pivoting armature (22), at least up to a second swiveling point (24, 29)   located in the second housing wall (11).