WO2011035851A1

WO2011035851A1 - Lifting system for changing the position of a movable hood

Info

Publication number: WO2011035851A1
Application number: PCT/EP2010/005418
Authority: WO
Inventors: Patrik Fuchs; Heinz Jacobus
Original assignee: Hydac Electronic Gmbh
Priority date: 2009-09-23
Filing date: 2010-09-03
Publication date: 2011-03-31
Also published as: DE102009042468A1

Abstract

A lifting system for changing the position of a movable hood (2) of a vehicle, especially a motor vehicle, comprising a first energy store (3), provided for moving the hood (2), and an unlockable locking device (4), is characterized in that the locking device (4) maintains the hood (2) in its locked position by virtue of a first magnet (5) and in that the magnetic field of a second magnet (6) superimposes the magnetic field of the first magnet (5) in the direction of off-setting its magnetic force to unlock the hood (2) and change its position.

Description

Lifting system for changing the position of a displaceable hood

The invention relates to a lifting system for changing the position of a displaceable hood of a vehicle, in particular of a motor vehicle, provided with a displacement of the hood provided first energy storage and an unlock Baren locking device.

In automotive engineering, numerous forms of safety devices, such as airbags, harness restraints and the like, are known to occupants of motor vehicles. Protective measures of a constructive nature, in particular actively acting protection systems for pedestrians and cyclists, which are detected in particular in the area of the front bumper of a passenger car, have hitherto hardly been proposed, nor have they been implemented in practice. Vehicle accidents involving pedestrians, which occur at speeds of up to 60 km / h, are particularly problematic, since the pedestrian often hits his head on the passenger compartment of the passenger car when he is detected head-on, suffering severe or even fatal injuries can.

The severity of the injuries results from the fact that the front or bonnet, which is usually formed of thin sheet metal, would tend to deform and to this extent mitigate the impact by forming deformation energies; just below the bonnet are virtually no or only difficult deformable parts available, such as Engine block, the valve cover or the longitudinal and transverse beams of the vehicle, which then significantly increase the risk of injury.

It would therefore be desirable if the impact, in particular the head of a pedestrian, could be mitigated in its consequences, it being shown that at speeds above 60 km / h, the pedestrian regularly no longer, as described above, detected, but rather is thrown over the vehicle. DE 29 22 893 A1 proposes to support energy absorbing U-shaped profiles on body parts and to arrange them between the hood and fender. The pertinent U-profiles are then in the event of a collision to convert the impact into deformation energy.

The disadvantage of this arrangement is on the one hand that already considerable forces would have to act on the profiles to deform them, and also the profiles are expensive to assemble, so that the realization of this known solution is also costly.

DE 28 41 315 A1 describes a safety device in which, in response to a signal of a sensor arranged in the front region of a vehicle for detecting a collision with a pedestrian, the front hood is displaced from a rest position into a contrast raised crash position by a piston-cylinder unit , wherein the displacement is supported by an energy storage. When lifting the front hood is pivoted about a arranged on the front end side of the vehicle horizontal axis of rotation by a predetermined angular amount upwards.

DE 197 10 41 7 A1 likewise describes an arrangement for lifting the front hood, in which a pivoting movement about a horizontal axis of rotation arranged on the front side of the vehicle is ensured by the same. Be triggered by the gas spring, which also supports the lifting of the front hood at the other end in the windscreen area.

DE 197 21 565 A1 describes a safety device on motor vehicles for lifting the front hood, in which the lifting of the front hood is speed-dependent by a cooperating with the hood lock mechanism. For this purpose, either the normally triggered for safety reasons out of the cab unlocking the acted upon by a compression spring lock is caused by a sensor or triggered by an impact at a higher speed by an integrated in the hood lock piston-cylinder unit is used together with a propellant charge.

Disadvantage of this arrangement is that the force required to close the front hood must not exceed a certain threshold, in order to allow the driver still to be able to close the bonnet comfortably from the outside. However, since the impact forces are relatively high in a personal accident, then the bonnet is pushed down prematurely quickly and can absorb too little impact energy in the event of a possible accident.

DE 27 1 1 338 A1 in turn describes a device for damping the impact of a pedestrian, in which an airbag in the region of a cowl, adjacent to the windshield of the vehicle is arranged, the filling is triggered by a sensor signal in the impact case. The airbag is preferably arranged such that it simultaneously lifts a portion of the front hood with its filling. It is also proposed to additionally arrange flexible profile body in strip form in the manner of a seal between the hood and side parts of the vehicle, in order to provide further protection during impact. DE 27 1 1 339 A1 again describes a hinged front panel on the front, in which the articulation is designed so resilient that it allows a horizontal displacement of the front hood by the impact of a pedestrian, with the front hood displaced to the rear side one end of a rigid locking element is connected, the other end is displaced backwards in a kind of guide curve upwards and backwards upon displacement of the front hood in such a way that the front hood performs a movement upwards. This lifting works only under the condition that it actually comes to a horizontal displacement of the bonnet by the impact of a pedestrian, which would not always be guaranteed, for example, in the case of impact of children due to their small body size.

Based on the above-mentioned prior art, the invention is based on the object of providing a lifting system for changing the position of a displaceable hood of a vehicle, which offers a high level of safety required for series production and yet is inexpensive and of compact construction. This object is achieved with a lifting system with the features of claim 1 in its entirety.

The lifting system according to the invention makes it possible to activate a hood of a vehicle and in particular a front hood so actively that in the case of a possible impact of a person who can be detected, for example, by a sensor arranged in the front region of the motor vehicle, the hood is abruptly moved to a raised position so as to significantly mitigate the effect of the impact, especially in the head area of the person. The lifting system according to the invention is further characterized in that it moves with a minimum of mechanical Parts so that the risk of malfunction is significantly minimized by possible inhibitions during operation.

The lifting system has a locking device for unlocking the hood, which is held in its locked position by a first magnet, which is preferably a permanent magnet. The thus locked position of the locking device corresponds to the usual installation position of the hood in the closed state. A second magnet, which may be an electromagnet, is capable of weakening or canceling the magnetic field of the first magnet in the sense that it may come to a sudden release of the hood, which then brought from a first energy storage in a raised position which leads to an increase in their possible absorbable impact energy. When weakening or canceling the magnetic field of the first magnet, a second energy storage occurs and displaces an axially displaceable component in a frame or a housing of the lifting system. The second energy storage comprises radially the axially displaceable component and is supported on housing parts of the lifting system and on a fixedly connected to the axially displaceable component stop plate or other stop element.

The axially displaceable component preferably has a control element at its one free end. The designed in the form of a locking bell control has a cam or control cam track, in order to control at least one blocking element of the locking device. The respective locking element releasably connects the hood with a vehicle-fixed other body component and dissolves the hood abruptly from the vehicle-mounted components with a corresponding displacement of the axially displaceable component on the triggering device by means of the indicated magnetic control. The hood can be integral part of the movable hood; However, the displaceable hood in the sense of the invention can also optionally act on further third components on the hood. The stop element, on which the second energy store is supported, is formed in a particularly preferred embodiment in the manner of a circular disk. If the second energy store is designed as a helical compression spring, the disk has approximately the same or a slightly larger diameter than the second energy store. The unlocking process and the associated displacement of the stop element take place counter to the direction of force of a third energy store. The unlocking and the associated displacement of the stop element is thus opposite to the direction of force of this third energy storage. The third energy store is further able, when the countermagnetic field is raised to the magnetic field of the first magnet, to return the stop element, together with the axially displaceable component and control element, under the effect of the magnetic field of the first magnet, to return the hood to its locked position, so that the lifting system is set back to the initial state for a possible re-triggering or application. In this case, at least the respective blocking element is returned by the control again in its locked original position.

To produce a particularly compact design of the lifting system, which allows an application at various points on a hood or other displaceable component of the body of a motor vehicle, is provided, the first and second magnets and the second energy storage and axially displaceable component in a replaceable To arrange unit. In this case, the axially displaceable component, which may be formed in the manner of a bolt-like plunger, forms the axial actuating center of the lifting system. The second magnet is preferably designed as energizable electromagnet whose energization is caused by an output stage of a triggering device, if necessary. The triggering device is preferably controlled by a proximity sensor and / or by a force sensor device or another suitable pressure sensor or acceleration sensor. It may also be expedient to interconnect a plurality of said sensors in an overall circuit with one another, wherein a computer unit can make a plausibility check for the actuation state of the overall arrangement as a function of the incoming sensor signals.

A particularly preferred operative connection of the axially displaceable component with the respective blocking element is obtained by the control element being arranged on an end region of the axially displaceable component and having control surfaces or inclined surfaces onto which the respective blocking element can slide, in order thus to release the axial displacement direction To reach locking elements together with the hood. In a particularly advantageous manner, the control is spring-loaded and axially displaceably guided in a predefinable damping region on the likewise axially displaceable component. The respective blocking element is arranged approximately transversely to the longitudinal axis of the axially displaceable component and spring-biased in the direction of the control, so that it can slide on the control or inclined surfaces.

In a particularly preferred embodiment of the lifting system two diametrically opposed locking pins are provided as locking elements and thus as part of the locking device. The second energy store is preferably designed in the manner of a helical compression spring, in particular of a cylindrical design. The first and second magnet are annular, wherein the first magnet can be designed to save space as a flat disc.

The first energy storage, which ensures the change in position of the hood with unlocked locking device is in the form of two compression springs, in particular in the form of two cylindrical helical compression springs formed. The helical compression springs may be arranged diametrically opposite to the locking device, wherein the lifting system has an all-component housing to form a kind of exchangeable assembly. It is particularly worth mentioning that the use of a permanent magnet, which causes a permanent force in a magnetic circuit of the lifting system, thereby keeps the triggering and locking system closed over its entire lifetime, for which no applied electrical energy or the like is necessary. In this way, the security system is independent of outside energies, which greatly enhances security.

The locking device may further form a separate assembly for itself, which can be summarized in the housing of the lifting system. To protect against operating fluids and dirt, it may be advantageous to surround the first and the second magnet with a housing made of elastomeric material. The invention is explained in more detail with reference to the drawing. This show in principle and not to scale representation of the

1 shows a schematic cross section through an embodiment of the lifting system according to the invention; 2 shows another cross section through the invention

Lifting system comparable to the structure of FIG.

FIG. 1 shows, in a schematic cross section, a lifting system designated as a whole with 1 for a hood 2 or for another body component of a passenger car. 1 shows only in principle the basic structure of the lifting system according to the invention and gives in particular of the free drive and traversing forth only the basic function structure again. The lifting system 1 serves the sudden lifting or another position change a hood 2 in case of need, wherein the hood 2 is shown only in a partial cross-section. The hood 2 is further pivotally mounted about an axis of rotation, not shown, formed by hinges, wherein the lifting system 1 occupies a predetermined distance to the front pivot region of the hood 2.

The hood 2 is directly part of the body cover, but can also attack from the bottom of a swiveling body hood on selbige to trigger a reversible lifting operation can.

A locking device 4 for blocking and unlocking the hood 2 has a flat disk designed as a first magnet in the form of a permanent magnet 5. Further, a second magnet 6 is present, which in energizing its coil winding in the event of a collision of a pedestrian or a cyclist with the Passenger cars (not shown) the magnetic field of the first magnet 5 abruptly superimposed in the sense of a repeal or weakening of the magnetic force. The first magnet 5 is separated from the second magnet 6 by a sleeve-like T-piece 26, seen in cross-section, which, together with a T-piece 26 Neten 5.6 surrounding sleeve 27 Flußleitelemente for the magnetic flux of both magnets 5.6 forms.

A second energy storage 7 is fixedly disposed in the unactuated biased state at one end in a cylindrical housing part 23, wherein the housing part 23 to form a telescopic guide with the other housing parts 40 of the lifting system 1 and under the action of the second energy storage 7 after loosening the decker-shaped hood. 2 can be moved axially upward from its shown position in the figures, whereby the second energy store relaxes. Further, the second energy storage 7 is supported in the direction of the figures with its upper end over about two Windungsbereiche on a centering 35 of the housing part 23, which is viewed in the longitudinal direction of the lifting system 1 centered by the longitudinally displaceable member 8. At its other, lower end of the second energy storage 7 is in contact with a formed as a kind of disc 14 stop member 13. The stop member 13 is fixedly connected to the axially displaceable member 8, which in the manner of a plunger in sliding guides in the frame 9 of Hubsystems 1 is guided.

If the permanent magnet 5 no longer has sufficient attractive force on the plate-shaped stop element 13, this can be moved together with the axially displaceable component 8 under the action of the second energy store 7 in the direction of the viewer of the figures down. This displacement movement takes place in the time range of milliseconds. The stop element 13 thereby moves in the direction of a Einschraubdeckeis 28, against the force of a third energy storage 15, which is arranged between the screw-28 and the stopper 13. The third energy storage 15 is preferably designed as a helical compression spring, the one Inner diameter limited, which is tangible by the axially displaceable component 8, if necessary.

As also illustrated in particular in FIG. 2, a control element 10, which is provided with sliding surfaces 29 formed at an angle of approximately 45 [deg.] To the axially displaceable component 8, is arranged on an upper axial end region 16 of the component 8. The control element 10 is supported under the action of a compression spring 31 in a spiral shape on an end stop 17, which is fixedly connected to the upper free end of the axially displaceable component 8. At the other opposite end of the coil compression spring 31 is fixed to a further fixed stop on the component 8, so that the control element 10 against the action of the spring 31 in case of need can move down under increasing the axial distance to said stop 1 7 in the form of Retaining rings 30. The oblique sliding surfaces 29 in turn cooperate with locking elements 1 1, which are performed in pairs diametrically opposite each other at least partially in the hood 2 and engage with their free ends in the cylindrical outer peripheral region of the frame 9 with its wall parts.

As shown in particular Fig.1-shows, the two locking elements 1 1 are formed from locking pins 19, which are guided in axial guides in the hood 2. Furthermore, the free ends of the two locking elements 1 1 on compression springs (not shown) can be supported, in order to support the Einfahrbewe- supply, as soon as the control 10 moves downward. In the pertinent retraction then drive the two locking elements 1 1 toward each other in the direction of the spool 10 as soon as the pertinent sliding surfaces 29 of the spool 10 come to rest below the lower edge of the locking elements 1 1. The locking elements 1 1 in the form of the locking pins 19 thus engage in their locked state in openings 32 in the housing 40 of the lifting system 1, which, as part of the Ge Stells 9 stationary component of the vehicle from which the hood 2 has to solve in the event of a collision.

Thus, if the second magnet 6 is energized in the event of a collision of the motor vehicle with a person and thus the magnetic field of the permanent magnet 5 is removed from its detention function, the control element 10 moves downwards out of the area of the locking pins 19, causing them to move radially towards one another move inside and thus cancel the Verras- tion of the hood 2 with the vehicle-mounted component 12 in the form of the frame 9. A first energy storage 3, which is preferably formed by two compression springs 21, 22, serves to raise the hood 2, wherein the two helical compression springs 21, 22 are arranged diametrically to the locking device 4 and extent in the closed housing 40 formed as a frame 9 for the lifting system 1 are held in pretensioned position before the actual release operation.

The housing 40, as shown in the embodiment of Figure 1, have a cross section in a kind of double U-shape. Furthermore, the inner vertical legs 33 of the housing 40 form a sleeve-shaped receptacle for the locking device 4 via the cover 41 as part of the hood 2 closes the housing 40 and extent the frame 9 to the outside, so that the lifting system 1 a total of compact design with a correspondingly large variance in terms of its applicability in the field of a motor vehicle.

FIG. 2 shows a lifting system 1 which has been modified with respect to FIG. 1 insofar as the two magnets 5, 6 are surrounded by a bell-shaped housing part 24, which preferably consists of an elastomeric material, so that the magnets 5, 6 are protected from the effects of splashed water and / or dirt and supplies are protected. The lifting system 1 can be controlled directly by an output stage of a triggering system (not shown) and, after tripping, can again be brought into a new, ready-to-operate position by a manual operation, which provides for pressing the hood 2 against the frame 9, in turn the permanent magnet 5 holds the plate-shaped stop element 1 3 in its attracted original position. Furthermore, the housing part 23 is brought together with the second energy storage 7 in the pre-release position according to the representations of Fig.l and 2 on the hood 2 and the telescopic guide. The axially displaceable component 8 can thereby be guided in sliding guides 34 of the cover part 35 as the end of the sleeve-shaped housing part 27.

As shown in Figure 2 further shows, as part of the housing 27, an end 36 of the Einschraubdeckeis 28 in the region of the magnets 5, 6 are arranged. To fix the elastomer cover 24, a circumferential bead 37, which engages in a peripheral groove 38 in the screw-in cover 28, is used in the lower region. At the other end, the housing 24 engages in a corresponding annular recess 39 in the axially displaceable component 8.

Claims

P a n t a n s p r e c h e

1. Lifting system for changing the position of a displaceable hood (2) of a vehicle, in particular of a motor vehicle, with a Verlager- tion of the hood (2) provided first energy storage (3) and an unlockable locking device (4), characterized in that the locking device ( 4) by a first magnet (5) holds the hood (2) in its locked position and that the magnetic field of a second magnet (6) for unlocking the hood (2) and position change thereof, the magnetic field of the first magnet (5) in Superimposed direction of a lift of its magnetic force.

2. Lifting system according to claim 1, characterized in that the locking device (4) by the action of the first and second magnets (5,6) and a second energy store (7) axially displaceable, in a frame (9) guided component (8 ), which is connected to a control element (10), the at least one blocking element

(1 1) for decoupling the hood (2) from a vehicle-fixed component

(12) pressed.

3. Lifting system according to claim 2, characterized in that the second energy store (7) of the locking device (4) is supported with its one end to the frame (9) axially displaceably guided housing part (23) and with its other end to a with the axially displaceable component (8) fixedly connected stop element (13) in order to displace the axially displaceable component (8) in the sense of unlocking the respective blocking element (1 1) when canceling the magnetic field effect. 4. Lifting system according to claim 3, characterized in that the stop element (1 3) is a kind of circular disc (14), which in an unlocking ment and locking the same axial movement as the axially displaceable component (8) performs, wherein the stop element (13) by a third energy storage (15) in the sense of a locked position for the respective blocking element (1 1) is biased.

Lifting system according to claim 3 or 4, characterized in that the second energy store (7) comprises the first and second magnets (5,6) and the axially displaceable component (8) at least partially radially.

Lifting system according to one of claims 1 to 5, characterized in that the first magnet (5) is a permanent magnet and the second magnet (6) is an electromagnet whose energization is carried out by an output stage of a triggering device or directly via a control of the airbag safety system.

Lifting system according to one of claims 1 to 6, characterized in that the triggering device is connected to a proximity sensor and / or a force measuring device and upon detection of a collision case of the vehicle, the energization of the second magnet (6) causes.

Lifting system according to one of claims 2 to 7, characterized in that the control element (10) on the axially displaceable component (8) is displaceably arranged on an end region (16) and that the control element (10) resiliently on the axially displaceable component (8 ) is held.

Lifting system according to one of claims 2 to 8, characterized in that the respective blocking element (1 1) transversely to the axially displaceable Chen component (8) is arranged and in the direction of the control element (10) spring-loaded in the hood (2) is guided radially displaceable.

10. Lifting system according to one of claims 2 to 9, characterized marked, that the respective blocking element (1 1) in an axial guide (18) on the hood (2) is arranged and part of the hood (2).

1 1. A lifting system according to one of claims 2 to 10, characterized in that two locking elements (1 1) in the manner of locking pins (19) diametrically opposite each other in the hood (2) are guided.

12. Lifting system according to one of claims 1 to 1 1, characterized in that the second energy store (7) as a cylindrical screw compression spring (20) is formed and the first and the second magnet (5,6) have a ring shape.

13. Lifting system according to one of claims 1 to 12, characterized in that the first energy store (3) of two diametrically opposed to the locking device (4) arranged compression springs (21, 22) is formed.

14. Lifting system according to one of claims 1 to 13, characterized in that the first and the second magnet (5,6) are surrounded by a housing (24) made of elastimerem material in a sealing manner.