Patent Application
20200362732
The invention relates to a support arrangement for an actuator of a cam phaser, with an actuator module including an actuator, and a support element for supporting the actuator module on a camshaft.
Cam phasers are used in valve trains of internal combustion engines to be able to set the phase relationship between the crankshaft and camshaft optimally and variably.
Support arrangements for the actuator or actuator drive for the cam phaser have been known for some time in the prior art. DE 102013013659 A1 discloses for example an assembly with at least one camshaft adjustment magnet and a support for attachment to a cylinder head of an internal combustion engine. As a further example, reference is made to publication DE 102016221990 A1 which discloses an electromagnetic actuator device with a housing, wherein the housing comprises amongst other elements a unit for fixing to a component receiving the electromagnetic actuator device.
The object of the invention is to improve the structure and function of a support arrangement of the type cited initially, and facilitate its installation.
According to one aspect, the object is achieved by a support arrangement for an actuator of a cam phaser, with an actuator module comprising an actuator, and a support element for supporting the actuator module on a camshaft. Here, the actuator module is connected to the support element by means of an electrical contacting for actuating the actuator, wherein the electrical contacting comprises an elastic clamping element.
Advantageous embodiments are provided in the dependent claims.
The improved support arrangement brings the advantage that, because of its modular structure, various installation positions are possible. Also, the design allows lower production costs since the arrangement can be produced in very high numbers to allow applications with lower quantities and different interface mounting requirements. In particular, it is possible to adapt an actuator and an actuator housing for different customer-specific interfaces, since only the support element is adapted to the corresponding interface. Different mounting configurations can be produced on one production line and adapted customer-specifically by means of the support element. Also, by means of the elastic clamping element, a fixed but still releasable electrical contacting is created. The clamp connection allows compensation for stresses and vibrations, whereby service life is extended and failure probability reduced. Damage to welded or soldered contacts can no longer occur. Irrespective of this, the actuator or actuator module may be tested for function before fitting to the support element.
Also, the actuator inside the actuator module is preferably an electromagnetic actuator.
According to an advantageous embodiment, the elastic clamping element is arranged on the support element. This means that the actuator contact is arranged externally on the actuator module so as to achieve the electrical contacting to the clamping element. In this way, the customer-specific adaptations are located entirely on the side of the support element. This increases the possible quantities for series production of the actuator module.
In a particularly advantageous embodiment, the elastic clamping element comprises a first clamping means and a second clamping means. The two clamping means are arranged separately or isolated from each other. By means of the two clamping means, an electrical circuit can be created which for example controls an electromagnet inside the actuator module. The electromagnet can thus be activated or deactivated and/or its polarity reversed.
The clamping means are preferably arranged parallel to each other. A parallel arrangement of the two clamping means is suitable in particular when the actuator contact is formed as a standard plug and hence with two plug pins arranged parallel to each other.
Also, the clamping element preferably comprises at least a first clamping arm for fixedly clamping an actuator contact, in particular, the one or both clamping means of the clamping element are formed with a clamping arm. The clamping arm is arranged such that on electrical contacting, the actuator contact is loaded or clamped by means of the clamping arm. In this way, the electrical contacting is particularly stable but can still compensate for stresses and vibrations.
According to a preferred embodiment, the clamping element comprises a second clamping arm for fixed clamping the actuator contact, wherein the second clamping arm is arranged opposite the first clamping arm. The actuator contact is thus clamped between the two clamping arms. The electrical contacting thus becomes more stable and more secure.
According to a further preferred embodiment, the clamping element comprises a third clamping arm for fixedly clamping the actuator contact, wherein the three clamping arms together form an M-shaped receiver for the actuator contact. The three clamping arms are arranged as an M-slot, wherein one of the clamping arms extends between the other two, mutually opposite clamping arms. As well as a particularly stable and secure contacting, with this arrangement it is also possible for the actuator contact to latch into the clamping element. For this, the actuator contact is formed wider on its side facing the support element than on its side facing away from the support element. The M-shaped slot also has the advantage that differently configured actuator contacts with different shape, size and orientation can be gripped or clamped.
According to the invention, advantageously the clamping arm is arranged at an angle of between 0° and 80°, preferably between 10° and 60°, to a longitudinal axis of the clamping element. The clamping arm, in a state in which the actuator module is held on the support element, is bent in a direction facing away from the actuator module. This has the advantage that, for example, the actuator contact can be introduced more easily into the clamping element. Also, subsequent release or extraction of the actuator contact becomes more difficult since the clamping arm acts as a claw. A particularly stable retention of the actuator contact is achieved if several bent clamping arms are arranged on the clamping element.
In an advantageous embodiment, the clamping element is arranged in at least one sealed pocket of the support element. For this, preferably, a sealant is provided for sealing the pocket on the side facing away from the actuator module. Particularly preferably, the pocket is sealed oil-tightly on this side. The pocket is initially configured still open so as to facilitate assembly and allow quality control. After complete installation and function test, the pocket is sealed on the outside by means of the sealant.
In a further embodiment, the support element has a surrounding plastic molding. The plastic molding is preferably produced by injection molding. Thus a particularly firm and sealed connection is formed between the inner components of the support element.
According to an additional advantageous embodiment, the support element is welded to the actuator module. Welding preferably takes place using ultrasound welding. Ultrasound welding is a method for joining thermoplastics and metallic materials. The welding is carried out by a high-frequency mechanical vibration in the range from usually 20 to 35 kHz, which leads to heating between the components due to molecular and interface friction, and in metals also to toothed engagement and interlocking of the joint partners. By means of the welding, in particular the ultrasound welding, the support element and actuator module are fixedly connected together. With ultrasound welding, also costs are saved since no additional materials are required in this method.
In a further preferred embodiment, the actuator module has at least one outwardly protruding pin which can be introduced into a corresponding depression of the support element. Thus the pin guarantees a precise positioning on joining of the actuator module and support element. A precise interplay of support element and actuator module is thus guaranteed.
In a refinement, the pin is preferably designed for welding to the support element. Preferably, at least two and particularly preferably three pins are arranged on the actuator module, which can each be introduced into a corresponding depression of the support element. The protruding ends of the pins are welded to the support element, preferably by ultrasound welding. This gives a precisely positioned and secure connection between the actuator module and the support element.
In a further embodiment, a radial seal is provided on the circumference of the actuator module. The seal is preferably formed as a sealing ring which allows an oil-tight contact of the actuator module on the support element.
Further advantages of the invention can be derived from the description and the drawing figures. The drawing is explained in more detail below with reference to the exemplary embodiment shown in the drawing figures, wherein:
Further components of the actuator module 2 and support element 3 are presented in the descriptions of
An elastic clamping element 20 is arranged inside the plastic molding 15 and is partly visible through the pockets 17, 18. The clamping element 20 here has the form of two clamping means 21, 22, wherein the first clamping means 21 is accessible via the first pocket 17, and the second clamping means 22 via the second pocket 18. The clamping means 21, 22 are provided to create an electrical contacting with the actuator contacts 12, 13 of the actuator module 2 inserted into the pockets 17, 18 from the actuator module side 4. Inside the plastic molding 15, the clamping means 21, 22 are connected to an electrical terminal 23. By means of the three depressions 19, the support element 3 can be positioned on the actuator module 2, wherein pins 14 protrude from the actuator module 2 and are introduced into the depressions 19 and welded thereto, preferably by means of ultrasound welding.
Secondly, a first clamping arm 26, a second clamping arm 27 and a third clamping arm 28 are arranged protruding inwardly from the frame element 24. The clamping arms 26, 27, 28 together form an M-shaped receiver and are each bent in the direction of the support element side 5. Because of the bent arrangement of the clamping arms 26, 27, 28, an actuator contact 12, 13 can be introduced more easily into a clamping means 21, 22 from the actuator module side 4. Also, subsequent release or extraction of the actuator contact 12, 13 is more difficult since the clamping arms 26, 27, 28 act as a claw. The M-shaped receiver also allows variously formed actuator contacts, with different shape, size and orientation, to be gripped or clamped.
All features explained and shown in connection with individual embodiments of the invention may be provided in various combinations in the object according to the invention in order to exercise their advantageous effects simultaneously. The scope of protection of the present invention is specified by the claims and is not restricted by the features explained in the description or shown in the figures.
Thus a support arrangement according to the invention may, in further embodiments (not shown here), comprise further interface-specific elements, functions and properties, For example, the number and position of the screw openings or bores is freely selectable, and/or a molded pressure limiter is provided for the screw openings or screw fixings. Furthermore, alternative fixing methods such as rotary locking or latch functions are possible. The support element may also contain information such as an identification number, a customer identification and/or other notes, which are for example glued or printed onto the support element. Also, a composition and orientation of actuator contacts or plug pins and the pins of the actuator module, and an electrical connection of the support element, are freely selectable. If necessary, the support element also has functions of supporting seals and/or wiring harnesses.
