This application claims priority to German Patent Application No. 102016010316.7, filed Aug. 25, 2016, which is incorporated herein by reference in its entirety.
The invention relates to a hood hinge for a motor vehicle having two attachment parts, of which one attachment part is designed for supporting and/or fastening to a vehicle body part and the other attachment part is designed for supporting and/or fastening to a front hood of the motor vehicle, having a mechanism for extending the attachment parts in relation to one another from a starting position into an end position, to raise the front hood from a starting position into a cushioning position for a pedestrian, for which purpose the mechanism has at least two lever parts, of which one lever part is linked to one of the attachment parts and the other lever part is linked to the other attachment part so they are respectively rotatable about a rotational axis and the lever parts are linked to one another so they are rotatable in relation to one another about a rotational axis, and having a limiting element for limiting an extension movement of the attachment parts in relation to one another. The invention furthermore relates to a motor vehicle having such a hood hinge.
A hood hinge of the type claimed here is known from DE 10 2010 023 283 A1. The hood hinge has a function in the event of a collision of the motor vehicle with a pedestrian. This is because it permits raising of the front hood from a starting position into a cushioning position for the pedestrian, for example, to moderate the force of the impact of the pedestrian by the front hood. For this purpose, the hood hinge is typically a component of a pedestrian protection system of the motor vehicle, which is activated, for example, via sensorial recognition of an imminent collision or an already occurring collision with a pedestrian, and then causes raising of the front hood, for example, by an actuator.
In the development or refinement of such pedestrian protection systems, efforts have been made to cause the extension of the front hood into the cushioning position for the pedestrian as rapidly as possible with respect to time. However, this is frequently made more difficult in that in the end phase of the extension procedure, when a limiting element which limits the extension movement becomes active, the front hood is excited into oscillations because of its mass inertia and the kinetic energy acting during the extension procedure. The desired cushioning position is then only reached after an oscillation-related time delay.
One embodiment of the invention is based on the object of proposing at least one possibility for being able to positively influence the raising movement of the front hood in the event of a collision of a motor vehicle with a pedestrian and raising of the front hood of the motor vehicle linked thereto as a pedestrian protection measure, in order to counteract possible oscillations of the front hood.
This object is achieved by a hood hinge which has the features of Claim 1. Furthermore, a motor vehicle having the features of Claim 11 is proposed to achieve the object. Advantageous embodiments of the invention result from the dependent claims, the following description, and the figures.
According to one embodiment of the invention, a hood hinge for a motor vehicle is provided, which has two attachment parts, of which one attachment part is designed for supporting and/or fastening to a vehicle body part and the other attachment part is designed for supporting and/or fastening to a front hood of the motor vehicle. The hood hinge has a mechanism, which is operationally connected to the attachment parts in particular and is designed for extending the attachment parts in relation to one another from a starting position into an end position, to raise the front hood from a starting position into a cushioning position for a pedestrian. For this purpose, the mechanism has at least two lever parts, of which one lever part is linked to one of the attachment parts and the other lever part is linked to the other attachment part so they are respectively rotatable about a rotational axis and the lever parts are linked to one another so they are rotatable in relation to one another about a rotational axis. Furthermore, the hood hinge has a limiting element for limiting an extension movement of the attachment parts in relation to one another.
The limiting element is designed as traction means, which is linked on one side in relation to one of the attachment parts and on the other side in relation one of the lever parts, so that a traction force is generated by the extension of the attachment parts in relation to one another, which limits the extension movement of the attachment parts. A use of the hood hinge in a broad palette of different motor vehicles is thus possible. This is because an extension movement of the front hood in the event of a collision of the motor vehicle with a pedestrian may be influenced in a simple and flexible manner by the hood hinge depending on the requirement, for example, by the respective design conditions, in particular the respective design of the front hood, for example, to counteract possible oscillations of the front hood in the end phase of the extension movement. For this purpose, it is provided, inter alia, that the limiting element is linked in relation to one of the lever parts. These lever parts make a rotational movement about at least one of the associated rotational axes in the course of the extension movement of the front hood, so that, if needed, the kinetic energy from the rotational movement can be used to positively influence the extension procedure. For example, it is provided that the limiting means designed as the traction means is connected on one side to the one attachment part, for example, directly or indirectly via an interconnected component, and on the other side engages directly or indirectly on the one lever part via an intermediate element connected thereto in a rotationally-fixed manner.
According to one embodiment of the invention, the limiting element is linked in relation to the one lever part at a distance to the rotational axes thereof. The linkage point of the limiting element is thus at a distance to the rotational axes of the lever part. This distance acts as a lever when the attachment parts of the hood hinge execute an extension movement in relation to one another and a pivot movement of the lever parts in relation to one another thus occurs. A torque is induced by the lever when the extension movement of the attachment parts in relation to one another is advanced enough that the limiting element becomes active and limiting of the extension movement is initiated.
For example, the limiting element is linked on a material section of the one lever part, in particular is linked directly or indirectly via a component held in a rotatable manner in relation to the material section, wherein the material section protrudes outward away from one of the rotational axes of the one lever part. For example, the material section protrudes outward away from one of its rotational axes in longitudinal extension of the lever part. Alternatively, the limiting element can be linked on a fastening element which is connected in a rotationally-fixed manner to the lever part, and which protrudes outward away from one of the rotational axes of the one lever part. The material section or fastening element protruding outward away from one of the rotational axes is to be understood in particular to mean that the material section or the fastening element, respectively, is arranged outside the region between the two rotational axes. It is decisive for the arrangement of the material section or the fastening element that the material section or the fastening element, respectively, protrudes outward away from one of the rotational axes such that an extension movement of the attachment part in relation to one another generates a torque when the limiting element exerts a limiting force acting on at least one of the attachment parts.
A torque oriented opposite in comparison thereto is generated according to one possible other embodiment of the invention if the limiting element is linked on a material section of the one lever part at a linkage point which is arranged between the rotational axes of the one lever part. Alternatively, the limiting element can be linked to a fastening element, which is connected in a rotationally-fixed manner to the one lever part, at a linkage point which is arranged between the rotational axes of the one lever part.
By way of the limiting element linking or engaging on the lever part at a distance to the rotational axes thereof, a torque is generated when the attachment parts are extended in relation to one another enough that the limiting element becomes active and exerts its limiting force on at least one of the attachment parts. This torque acts to assist the rotational movement on the lever part when the torque acts in the direction of the rotational direction of the lever part during the extension of the hood hinge. The torque, in contrast, brakes the rotational movement of the lever part during the extension of the hood hinge when the torque is oriented opposite to the rotational direction of the lever part. Depending on whether the linkage point for the limiting element is between the rotational axes of the lever part or is associated with the material section protruding outward away from one of the rotational axes, such an assisting or braking action on the rotational movement of the lever part and therefore on the end phase of the extension movement of the hood hinge is possible when the limiting element exerts its limiting force. The braking or assisting torque is only then generated by the limiting element.
Alternatively, according to a further embodiment of the invention, the limiting element can be linked so it is rotatable about one of its rotational axes on the one lever part. The limiting element can be linked so it is rotatable about one of its rotational axes on the one lever part directly or indirectly via an intermediate element connected in a rotationally-fixed manner thereto. For example, the intermediate element of the one lever part is arranged coaxially with respect to the one rotational axis and the limiting element is associated with a movement element, in particular attached thereon, which is rotatable about the rotational axis and at least partially encompasses the intermediate element coaxially with respect to the one rotational axis and so it is rotatable in relation to the intermediate element. An attachment of the limiting element on the one lever part is thus implemented in a technically simple manner, without a torque acting on the lever part being generated by the limiting element, when the limiting element exerts its limiting force on the at least one attachment part.
The intermediate element can be an axial section or another extension arranged in a rotationally-fixed manner on the one lever part, the center axis of which is coincident with the one rotational axis. The fastening element can also be an eye-shaped terminus part. The hood hinge is thus to be implemented in a technically simple manner.
It is thus suggested that one of the lever parts on which the limiting element engages is the lever part which is linked to the attachment part formed for supporting and/or fastening to the vehicle body part. Good lever relationships thus result for the limiting element, to limit the extension movement of the attachment parts in relation to one another.
The measure, according to which, according to a further embodiment of the invention, the limiting element is aligned on the lever part in respect to the rotational axis about which the lever part is linked so it is rotatable on the attachment part formed for support and/or fastening to the vehicle body part, is also aimed in this direction.
Furthermore, it is thus suggested that one of the attachment parts to which the limiting element is operationally connected is the attachment part designed for supporting and/or fastening to the front hood. A direct introduction of the limiting force exerted by the limiting element into the target component thus takes place, namely the attachment part used for extending the front hood.
The limiting element can be a cable pull, a tension rod which can be buckled, a chain, or a belt or can at least have such a component. The limiting element is formed in a technically simple and stable manner.
According to a further embodiment of the invention, the mechanism is or has a multiple joint, in particular a multiple pivot joint, which is designed for pivoting the front hood from a closed position into an open position. The mechanism thus has a double function. On the one hand, it is used for pivoting the front hood and, on the other hand, it is used in case of a crash with a pedestrian for extending the front hood into the cushioning position for the pedestrian.
For example, the mechanism has a further lever part, which is linked so it is rotatable about an axis of rotation on one of the attachment parts, on the one hand, and is linked so it is rotatable about an axis of rotation on the lever part which is linked so it is rotatable on the other of the attachment parts, on the other hand. The mechanism is thus embodied as robust and stable, to be able to pivot the front hood from the closed position into the open position and, on the other hand, in case of a crash with a pedestrian, to extend the front hood into the cushioning position for the pedestrian.
Furthermore, the invention comprises a motor vehicle having at least one vehicle body part, a front hood, and at least one hood hinge, as described above, by means of which the front hood is attached to the vehicle body part. The front hood can be the above-described front hood. The vehicle body part can be the above-described vehicle body part.
Further goals, advantages, features, and possible applications of the present invention result from the following description of multiple exemplary embodiments on the basis of the drawing. In this case, all features which are described and/or illustrated in the figures form the subject matter of the present invention per se or in any arbitrary reasonable combination, also independently of the summary thereof in the claims or what they refer to.
The present invention will hereinafter be described in conjunction with the following drawing figures, wherein like numerals denote like elements.
The following detailed description is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. Furthermore, there is no intention to be bound by any theory presented in the preceding background of the invention or the following detailed description.
The hood hinge 1 has two attachment parts 2 and 3, of which one attachment part 2 is designed for support and/or attachment to a vehicle body part, for example, the vehicle body part 110, and the other attachment part is designed for support and/or attachment to a front hood, for example, the front hood 120. For example, the attachment part 2 has at least one, preferably two attachment points 20, 21 for attachment to the vehicle body part 110. The hood hinge 1 furthermore has a mechanism which is operationally connected to the attachment parts 2, 3 and is designed for extending the attachment parts 2, 3 in relation to one another from a starting position A into an end position E, to raise the front hood 120 from the starting position SO into the cushioning position S1. In
The mechanism 4 has at least two lever parts 6, 7, of which one lever part 6 is linked so it is rotatable on one of the attachment parts 2, 3, in particular the attachment part 2, and the other lever part 7 is linked so it is rotatable on the other of the attachment parts 2, 3, in particular the attachment part 3, about a rotational axis 9 or 11, respectively, and the lever parts 6, 7 are linked so they are rotatable in relation to one another about a rotational axis 10. The mechanism 4 can be formed by a multiple pivot joint, for example, a fourfold pivot joint, or can have such a joint, which is designed for pivoting the front hood 120 from a closed position into an open position. For this purpose, the mechanism 4 can have a further lever part 8, which is linked on one side to one of the attachment parts 2, 3, in particular the attachment part 2, so it is rotatable about a rotational axis 12, and is linked on the other side to the lever part 7 so it is rotatable about a rotational axis 13.
As is apparent from
The limiting element 5 is designed as a traction means, which is operationally connected on one side to one of the lever parts 2, 3, in particular the lever part 3, and is linked on the other side to one of the lever parts 6, 7, in particular the lever part 6, so that a traction force is generated by the extension of the attachment parts 2, 3 in relation to one another, which limits the extension movement of the attachment parts 2, 3. The traction means can be a cable pull, a tension rod which can be buckled, a chain, or a belt.
As is apparent from
For this purpose, a fastening element 18 can be provided, which is, for example, fastened in a rotationally-fixed or rotatable manner on the material section 15 of the lever part 6 and on which the limiting element 5 engages, in particular is attached, in turn. The limiting element 5 is attached via the fastening element 18 to the lever part such that, for example, in the end phase of the extension movement of the attachment parts 2 and 3 in relation to one another, when traction force used for limiting the extension movement of the attachment parts 2 and 3 is generated by the limiting element 5, a distance is generated between the rotational axis 9 and the engagement point of the limiting element 4 in relation to the lever part 6 or in relation to the fastening element 18, so that a lever 19 is formed by the distance, which forms a torque acting about the rotational axis 9 in the course of the rotational movement of the lever part 6.
As is apparent from
The hood hinge 1′ of
In the case of a rotational direction according to arrow 30 of the lever part 6′ during the extension movement of the attachment parts 2 and 3 in relation to one another, a torque which acts in the rotational direction 30 is generated by the lever 19′. The torque generated by the lever 19′ therefore assists the extension movement of the attachment parts 2, 3 in relation to one another in the end phase of the extension procedure when the limiting element 5 unfolds its traction force.
The hood hinge 1″ of
The limiting element 5 is preferably associated with a movement element 17, in particular attached thereon, which is rotatable about the rotational axis 9 and at least partially encompasses the intermediate element 14 coaxially with respect to the rotational axis 9 and so it is rotatable in relation to the intermediate element 14. The intermediate element 14 is, for example, an eye-shaped terminus part, to which the limiting element 5 is attached.
Due to the rotational ability of the movement element 17 in relation to the lever part 16 and the coaxial attachment of the movement element 17 with respect to the rotational axis 9, no torque caused by the limiting element 5 is transmitted to the lever part 6″. This is indicated by way of example in
Since only one or more exemplary embodiments were described above, it is to be clarified that in principle a variety of variations and deviations are possible. Furthermore, it is to be clarified that the described embodiments only represent examples, which do not restrict the scope of protection, the applicability, or the construction. Rather, the abstract and the described embodiments merely represent a practical introduction for a person skilled in the art, on the basis of which a person skilled in the art can arrive at at least one exemplary embodiment. In this case, it is self-evident to a person skilled in the art that various modifications can be performed with respect to the function and the arrangement of the elements described with reference to the exemplary embodiments, without deviating from the scope of the appended patent claims and the equivalents thereof.
Number | Date | Country | Kind |
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DE102016010316.7 | Aug 2016 | DE | national |