LOCKING DEVICE FOR A MOVABLE PART OF A VEHICLE

Abstract

A locking device for a movable part of a vehicle, in particular for a bonnet of a vehicle, having a locking mechanism which can be mounted on the body side and intended for receiving a lock holder arranged on the movable part, and also having a raising mechanism which can be brought into contact with the lock holder and intended for moving the movable part into at least one protection position, wherein the raising mechanism has at least a first overload protector, with the result that, in a load situation, the movable part is movable from the protection position into an impact position.

Claims

1. A locking device for a movable part of a vehicle, in particular for a bonnet of a vehicle having a locking mechanism which can be mounted on the body side and is intended for receiving a lock holder that is arrangeable on the movable part, and having a raising mechanism which can be brought into contact with the lock holder and is intended for moving the movable part into at least one protection position, wherein the raising mechanism comprises at least one first overload protector which enables the movable part to, in a load condition, be movable from the protection position into an impact position.

2. The locking device according to claim 1, wherein the raising mechanism comprises a raising lever, a drive lever which is connectable to the raising lever and the locking mechanism, in particular a pawl, and an activation means which can be brought into contact with the drive lever.

3. The locking device according to claim 1, wherein the overload protector is arranged on the drive lever.

4. The locking device according to claim 1, wherein the overload protector is designed as an intended breaking point, in particular in the form of a material recess on the drive lever.

5. The locking device according to claim 1, wherein the drive lever comprises an activation arm and a raising arm, wherein the raising arm comprises an actuating element able to be brought into contact with the drive lever and a support element able to be brought into contact with the locking mechanism, in particular the pawl, and that the overload protector is arranged on a guide contour of the drive lever which connects the actuating element and the support element.

6. The locking device according to claim 1, wherein the locking mechanism, in particular the pawl, slides, at least during a movement of the movable part and at least along portions of the guide contour, from the impact position into the protection position, a closed position, and/or an open position.

7. The locking device according to claim 1, wherein a guide element having a guide contour is arranged on the overload protector of the drive lever, and that the guide contour is able to be brought into contact with the pawl during a movement of the movable part from the impact position into the protection position, a closed position, and/or an open position.

8. The locking device according to claim 1, wherein, in a load condition, the support element is deformed within the first overload protector, in particular that the guide element comprises a recess for the support element, with the result that the support element can be arranged within the recess in a load condition.

9. The locking device according to claim 1, wherein the drive lever comprises a second overload protector, in particular that the second overload protector is designed as a notch on the drive lever.

10. The locking device according to claim 1, wherein the guide element comprises at least one support arm, in particular that the support arm is designed to be essentially Z-shaped.

11. A method of actuation for a locking device for a movable part of a vehicle according to claim 1, intended for an accident-related load condition in which the movable part is located in a protection position, said method comprising the following steps: a) rotating a vehicle-side raising lever about an axis while transmitting a defined impact force from a lock holder arranged on the movable part to the vehicle-side raising lever, b) rotating a drive lever about a further axis while applying a load torque from the raising lever to the drive lever, c) triggering at least one overload protector on the drive lever, d) lowering the movable part from the protection position into an impact position.

Description

[0055] In the following embodiments, like or equivalent elements are described using like reference signs, and duplicate descriptions thereof will be avoided.

[0056] Shown are:

[0057] FIG. 1 a first potential embodiment of a locking device according to the invention,

[0058] FIG. 2 a second potential embodiment of a locking device according to the invention,

[0059] FIG. 3 a detail of a locking device according to the invention in the area of the overload protector in the first embodiment,

[0060] FIG. 4 a detail of a locking device according to the invention in the area of the overload protector in the second embodiment,

[0061] FIG. 5 the second potential embodiment of a locking device according to the invention in the impact position, and

[0062] FIG. 6 a motor vehicle having a movable part and a locking device according to the invention.

[0063] FIG. 1 illustrates a first potential embodiment of a locking device 10 according to the invention. According to the invention, the locking device features a locking mechanism 11 which is supportable or mountable on a body of a vehicle. It is also conceivable for the locking mechanism 11 to be arranged on a movable part of a vehicle. In the embodiment shown, the locking mechanism 11 comprises a pawl 12 and a rotary latch 13. The pawl 12 and the rotary latch 13 can be brought into operative engagement so that a lock holder 14 can be latched by the locking mechanism 11. The lock holder 14 is preferably arranged on a movable part of a vehicle, e.g. a hood or lid. Accordingly, the movable part of the vehicle can be immovably held in a closed position by the locking mechanism 11 so as to prevent movement into an open position. The locking device 10 further features a raising mechanism 15. This raising mechanism 15 comprises at least one raising lever 16, a drive lever 17, and an activation means 18.

[0064] The raising mechanism 15 enables the movable part to be elevated, with the locking mechanism 11 simultaneously latching the lock holder 14. An activation means 18 is provided for this purpose and is, for example, designed as a pyrotechnic activation means which exerts a force on the drive lever 17 by means of pyrotechnic action. The drive lever 17 diverts this force to the raising lever 16 so that the latter comes into contact with the lock holder 14 and moves it in opposition to the force vector 50 shown.

[0065] FIG. 1 shows the locking device 10 in the protection position I, in which a movable part is elevated with respect to a closed position. The raising mechanism 15 is accordingly designed as a lever mechanism, as a result of which the force generated by the activation means 18 is able to be transmitted to the lock holder 14. In order to divert the force from the activation means 18 to the lock holder 14, the activation means 18 is associated with a guide lever 17. In FIG. 1, the activation means 18 is illustrated in an activated state, in which case contact between the activation means 18 and the guide lever 17 is designed such that the guide lever 17 is rotated about an axis A by a force from the activation means 18.

[0066] The guide lever 17 comprises an activation arm 17.1 and a raising arm 17.2. In FIG. 1, the activation arm 17.1 is in contact with the activation means 18. The raising arm 17.2 is simultaneously in contact with the raising lever 16. In this context, the raising arm 17.2 in the embodiment shown comprises an actuating element 17.3, which forms a curved contour of the raising arm 17.2 and is in contact with the raising lever 16. In an accident, i.e., when a person strikes the movable part, the force 50 acts on the raising lever 16, thereby transmitting the force to the raising lever 16 via the lock holder 14. In order to then at least reduce injuries to the person involved in the accident, it is desirable for the movable part to yield in the direction of force vector 50 so that the impact forces can at least be partially diverted to move the movable part from the protection position I into an impact position II. In the impact position, the movable part is again moved by a defined distance towards the closed position.

[0067] In order to lower the movable part and, therefore, the raising lever 16, it is proposed according to the invention that an overload protector 20 be arranged on the guide lever 17. Moreover, as shown in FIG. 1, it is preferable for a second overload protector 30 to be provided. In FIG. 1, the overload protector 20 features a material recess 20. This recess is formed on the guide lever 17 between a support element 17.4 and the actuating element 17.3. Moreover, a support contour 17.5 is formed in the area between the support element 17.4 and the actuating element 17.3, in which case the pawl 12 can be guided along the support contour 17.5 during a movement between a blocking position, in which the rotary latch is blocked, and the released position.

[0068] As previously explained, the locking device 10 in FIG. 1 is located in the protection position I, in which the locking mechanism 11 is latching the lock holder 14. The rotary latch 13 is arranged around the lock holder 14 for this purpose, with the pawl 12 blocking the rotary latch 13 at the same time. In this case, the pawl 12 contacts the drive lever 17 in the area of the support element 17.4, the support element 17.4 thus lying against the pawl 12.

[0069] The drive lever 17 in FIG. 1 further features a second overload protector 30 in the area of the support element 17.4.

[0070] In the embodiment according to FIG. 1, overload protector 20 and overload protector 30 are, by way of example, designed as notches in order to enable a deformation of the support element if the raising lever 16 is moved into the impact position.

[0071] FIG. 2 shows a further potential embodiment of the locking device 10 according to the invention. In this context, the only difference in the second embodiment is an additional guide element 19 on the overload protector 20. Accordingly, the following will address only the differences in detail.

[0072] The guide element 19 according to the invention features a first support arm 19.3 and a second support arm 19.4. Both support arms 19.3 and 19.4 are in this case arranged to overlap at least in portions and are arranged in the overload protector, hence (in FIG. 2) in the material recess 20. In FIG. 2, both support arms 19.3 and 19.4 are arranged one behind the other (based on the frontal view shown). A recess 19.2 and a guide contour 19.1 are formed by means of this arrangement and the essentially Z-shaped design of the support arms 19.3 and 19.4. The guide contour 19.1 enables the support contour 17.5 of the drive lever 17 to continue despite the material recess 20. As a consequence, the advantage of the guide contour 19.1 is that the pawl 12 will not slip into or get stuck in the material recess 20 when sliding across the support contour 17.5. Moreover, the two support arms form a recess 19.2 for the support element 17.4 in case the support element 17.4 is deformed about the bending axis 40 (as will be explained in more detail hereinafter).

[0073] FIG. 3 shows a detail of the locking device according to the invention from FIG. 1. In particular, FIG. 3 illustrates the overload protection area 21 comprising overload protector 20 and overload protector 30. Further shown is the cooperation between the mechanisms of the raising mechanism 15, which consists of the pawl 12, the raising lever 16, and the drive lever 17.

[0074] The raising lever 16 is illustrated only in the contact area for the drive lever. The raising lever and the drive lever come into contact on the actuating element 17.3 in the area of the raising arm 17.2 of the drive lever 17. The raising arm 17.2, which is formed on the upper part of the drive arm 17, further comprises a reinforcement contour 17.6 in the area of the first and second overload protectors 20, 30. The reinforcement contour 17.6 can be designed as a shape or a material reinforcement and reinforces the drive lever 17 in the area of the raising arm 17.2 otherwise weakened by the overload protectors 20, 30.

[0075] FIG. 3 further shows the contact between the pawl 12 and the support element 17.4, as a result of which movement of the raising lever 16 towards an impact position (i.e., a lowering of the movable part) is at least partially inhibited.

[0076] FIG. 4 shows a partial view of the locking device 10 from FIG. 2. The locking device is nevertheless located in the closed position. In this context, the term closed position describes a position of the movable part, e.g. a hood or a lid, in which said part is arranged essentially flush with the body of the vehicle. This corresponds to the normal position of the hood or lid when the motor vehicle is being driven. As a result, the raising lever 16 in FIG. 4 is slightly lowered as compared to that in FIGS. 1 to 3.

[0077] As a consequence, the drive lever 17, which is in contact with the raising lever 16, rotates around axis A. As previously explained in regard to FIG. 2, the drive lever 17 in FIG. 4 also features a guide element 19 according to the invention, so, for the design details thereof, reference is made to the description of FIG. 2.

[0078] FIG. 5 shows a second potential embodiment according to the invention in which, as shown in FIGS. 2 and 5, the locking device 10 is in the impact position II.

[0079] In the impact position II, the support element 17.4 is deformed within the recess 19.2 of the guide element 19 and about the bending axis 40. It is clearly evident that the inventive guide contour 19.1 of the guide element 19 then at least reduces, or even completely prevents, the otherwise potential risk of the pawl 12 catching on the drive lever 17. The rounded guide contour 19.1 adjoins the guide contour 17.5 of the guide lever 17. As a consequence, the pawl can be moved back after reaching the impact position so that the locking device is actuable even after a person has impacted the movable part. The guide element 19 thus guarantees the flawless function of the locking mechanism even after an accident.

[0080] FIG. 6 shows a vehicle 100 in the form of a motor vehicle 100. The motor vehicle 100 features a movable part 110 in the form of a hood, in particular an engine cover, having a locking device 10 according to the invention. During an accident with, for example, a pedestrian or cyclist, the hood 110 would, by means of the locking device 10 according to the invention, first be moved into a protection position in which the hood 110 is elevated by a defined positioning distance. If a person then falls onto the hood 110, then the hood can, by virtue of the first and/or second overload protector, be moved into the impact position by means of the locking device 10 according to the invention, with the result that the risk of serious injuries to said person is able to be reduced.

[0081] The foregoing explanation of the embodiments describes the present invention solely within the scope of examples. Insofar as technically practical, specific features of the embodiments may obviously be combined at will with one another without departing from the scope of the present invention.

LIST OF REFERENCE SIGNS

[0082] 10 Locking device [0083] 11 Locking mechanism [0084] 12 Pawl [0085] 13 Rotary latch [0086] 14 Lock holder [0087] 15 Raising mechanism [0088] 16 Raising lever [0089] 17 Drive lever [0090] 17.1 Activation arm [0091] 17.2 Raising arm [0092] 17.3 Actuating element [0093] 17.4 Support element [0094] 17.5 Support contour [0095] 17.6 Reinforcement contour [0096] 18 Activation means [0097] 19 Guide element [0098] 19.1 Guide contour [0099] 19.2 Recess for the support element [0100] 19.3 First support arm [0101] 19.4 Second support arm [0102] 20 First overload protector [0103] 21 Overload protection area [0104] 30 Second overload protector [0105] 40 Bending axis [0106] 50 Force vector in a load condition [0107] 100 Vehicle [0108] 110 Movable part [0109] I Protection position [0110] II Impact position [0111] A Rotational axis of the drive lever