DE29804648U1 - Bonnet lock for a motor vehicle - Google Patents

Description

Utility model application

Bonnet lock for a motor vehicle

Lock and metal goods factory Böddecker & Co. GmbH & Co.KG Flieth 9

D-42327 Wuppertal (DE)

VGN 258 024 22 791 DE Munich/Paris/Western 11.3.1998

· I

Bonnet lock for a motor vehicle

The invention relates to a hood lock for a motor vehicle with a rotary latch that can be actuated by a counter-locking part and a locking pawl having a locking shoulder, wherein in the closed position a latch leg end of the rotary latch strikes the locking shoulder and wherein the rotary latch cannot be released from the locking pawl by over-tightening.

Such locks are known in various designs. For example, the underside of the bonnet has a substantially U-shaped counter-locking part, which with its U-shaped web in the locked position enters the forked mouth of the rotary latch, which is rotatably mounted in a lock housing provided on the body. The latter is pivoted during the closing movement of the bonnet into a position that catches the U-shaped web of the counter-locking part. This position is secured automatically, with the spring support of the locking pawl arranged on the lock side. When the bonnet is closed, very high forces may act on the rotary latch of the bonnet lock. In the state of the art, these forces acting in the over-rotation direction of the rotary latch are introduced into a side wall of the lock housing, for example via a stop arm on the rotary latch that interacts with the forked latch like a rocker. However, it was found that such a stop arm molded onto the rotary latch deforms or even breaks off if subjected to repeated high stress.

In view of the state of the art described above, a technical problem is seen in a bonnet lock of the type in question

VGN 258 024 22 791 DE Mu./Pa./We. 11.3.1998

which is improved in terms of the dissipation of forces acting during the closing process of the bonnet.

This problem is initially and essentially solved by the subject matter of claim 1, whereby the locking pawl has a stop shoulder in the over-rotation direction of the rotary latch, in order to divert a load occurring in the over-rotation direction into the rotary holder of the rotary latch or the locking pawl and, via this, into the fastening points of the lock. As a result of this design, the rotary movement of the rotary latch is not only limited by the stop pawl in the opening direction of rotation, as is known from the prior art, but also in the closing direction of rotation. The end of the latch leg, which is supported against the locking shoulder of the locking pawl in the secured closed position, strikes the stop shoulder of the locking pawl designed according to the invention in the over-rotation direction of the rotary latch, whereby further forces acting on the rotary latch are diverted via the locking pawl and the rotary latch in its rotary holders. According to the invention, a two-point force introduction is thereby realized. A positive interaction between the latch leg end and the stop shoulder of the pawl is preferred. Furthermore, the stop shoulder is preferably positioned in such a way that a slight over-rotation of the rotary latch is possible, for example over a rotation angle of 1 to 3°. Due to the geometric conditions, a certain over-stroke is required anyway. In an advantageous further development of the subject matter of the invention, it is provided that the locking shoulder and the stop shoulder are formed by legs of an overall U-shaped recess of the pawl. In this U-shaped recess,

VGN 258 024 22 791 DE Munich/Paris/Western 11.3.1998

In the closed position, one end of the latch leg of the rotary latch engages almost positively. It is further provided that a base of the U-shaped recess has a protrusion, which reduces the surface contact. Finally, in a bonnet lock of the type in question, where the rotary latch is accommodated in a rotary latch holder, it is proposed that the rotary latch further has a counter stop that interacts directly with the rotary latch holder. The latter is preferably designed in the form of a stop arm, which is molded onto the rotary latch behind the latch opening and interacts like a rocker with the latch leg end that enters the U-shaped recess of the pawl. In the closed position, this counter stop on the rotary latch side interacts with the rotary latch holder, for example with the lock housing, when the rotary latch is loaded in the over-rotation direction, which also diverts part of the closing forces introduced into the rotary latch. This results in a three-point force introduction.

The invention is explained in more detail below with reference to the accompanying drawing, which merely represents an exemplary embodiment. It shows:

Fig. 1 a motor vehicle with a bonnet and a closure for the same;

Fig. 2 the bonnet lock in a perspective view, omitting a body-side cross member and a front lock wall, relating to the lock position;

VGN 258 024 22 791 DE Munich/Paris/Western 11.3.1998

Fig. 3 is a top view of the bonnet lock in the position shown in Fig. 2;

Fig. 4 shows the section along the line IV-IV in Fig. 3, but relating to a position during a closing movement ;

Fig. 5 is a representation corresponding to Fig. 4, but concerning the locking position.

Shown and described with reference to Fig. 1 is a motor vehicle 1 with a hood 2. The latter has a counter-locking part 3 in its front, middle area on the underside, which is caught in a hood lock 4 arranged on the body side in order to lock the hood 2 in the closed state.

The bonnet lock 4, which is only shown schematically in Fig. 1, is shown in detail in Fig. 2. This lock 1 has a housing 5 that is to be attached to a suitable location on the motor vehicle 1, for example in the area of a front cross member of the engine compartment. A channel 6 extends from the center of the upper edge of this housing 5, which is aligned with the closing path of the counter-locking part 3 on the bonnet side and ends in a funnel-shaped widening 7 on the upper edge side. A fork-shaped rotary latch 9 provided with a forked mouth 8 protrudes into the area of the channel 6. An axle bolt 10 held in the housing 5 serves to pivotally mount it.

A pawl 11 pivotably mounted on the other side of the channel 6 forms a locking shoulder

VGN 258 024 22 791 DE Munich/Paris/Western 11.3.1998

12. This pawl 11 is mounted in the housing 5 via another axle bolt 13.

The rotary latch 9 is pre-tensioned in the opening direction, i.e. in the direction of release of the counter-locking part, by a leg spring 14. In the hood locking position according to Fig. 2, the counter-locking part 3 is caught in the fork mouth 8 of the rotary latch 9. The rotary latch 9 is locked by the locking pawl 11 against rotational reversal in the direction of release. In this case, in a known manner, a latch leg end 15 of a fork arm rests on the underside of the locking shoulder 12 of the locking pawl 11, which is pre-tensioned in this locking position by means of a further leg spring 16.

The locking shoulder 12 is formed as a leg of a U-shaped recess 17 of the pawl 11. The opposite leg of this recess 17 forms a stop shoulder 18. The flank of the latch leg end 15, which is formed opposite the locking shoulder 12, strikes against this during the closing rotational movement. The latch leg end 15 is caught in the U-shaped recess 17 in the closed position according to Fig. 5. As a result, the rotary latch 9 is locked in the over-rotation direction (arrow a).

The forces introduced into the rotary latch 9 by the locking process via the counter-locking part 3 are diverted via the inventive form fit between the latch leg end 15 and the stop shoulder 18 into the rotary brackets, i.e. into the axle bolts 10 and 13 of the rotary latch 9 and the pawl 11. In addition, a force is introduced into the fastening tabs 25 formed on the housing 5 and associated with the axle bolts 10, 13, via which the lock 4 is attached to the body of the

VGN 258 024 22 791 DE Munich/Paris/Western 11.3.1998

vehicle. This provides a two-point force introduction.

The distance between the locking shoulder 12 and the stop shoulder 18 of the recess 17 is selected so that a certain over-stroke of the rotary latch 9 of approx. 1 to 3° is permitted, which over-stroke serves to facilitate the locking parts engaging (see dash-dotted representation in Fig. 5). This slight over-stroke is limited in its path by the stop shoulder 18.

The base 19 of the U-shaped recess 17 has a protrusion 20, which in the closed state is acted upon by a front edge of the latch leg end 15. This reduces the surface contact.

Furthermore, the rotary latch 9 has a counter stop 21 in the form of a stop arm that interacts with the latch leg end 35 like a rocker at the rear of the forked jaw 8, i.e. in the area facing away from the latch leg end 15. As can be seen from the sectional view in Fig. 5, this interacts with the housing, which here forms a rotary latch holder, in the permitted slight over-rotation position. Specifically, the design is selected so that the counter stop passes through a slot-like opening 22 in a housing side wall 23 and, in the described over-rotation position, rests on an edge of this recess 22. This design forms a further force introduction point, which is to be considered secondary. The main dissipation of the acting forces takes place - as described - via the rotary holders of the rotary latch 9 and pawl 11.

VGN 258 024 22 791 DE Mu./Pa./We. 11.3.1998

In addition, the engagement of the counter stop 21 in the opening 22 prevents the rotary latch 9 from breaking through in the event of incorrect operation (pulling the pawl 11 in the release direction while simultaneously closing the bonnet).

The previously described design can also be used, for example, on tailgate locks or the like that are provided with a rotary latch and a locking pawl.

All disclosed features are essential to the invention. The disclosure content of the associated/attached priority documents (copy of the prior application) is hereby fully included in the disclosure of the application, also for the purpose of incorporating features of these documents into the claims of the present application.

VOJ 258 024 22 791 DE Mu./Pa./We. 11.3.1998

Claims (4)

EXPECTATIONS 1. Bonnet lock (4) for a motor vehicle (1) with a rotary latch (9) that can be actuated by a counter-locking part (3) and a locking pawl (11) having a locking shoulder (12), wherein in the closed position a latch leg end (15) of the rotary latch (9) comes against the locking shoulder (12), and wherein the rotary latch (9) cannot be released from the locking pawl (11) by over-twisting, characterized in that the locking pawl (11) in the over-rotation direction (arrow a) of the rotary latch (9) has a stop shoulder (18) for diverting a load occurring in the over-rotation direction (arrow a) into the rotary holder of the rotary latch (9) or the pawl (11). 2. Bonnet lock according to claim 1 or in particular according thereto, characterized in that the locking shoulder (12) and the stop shoulder (18) are formed by legs of an overall U-shaped recess (17) of the locking pawl (11). 3. Bonnet lock according to one or more of the previous claims or in particular according thereto, characterized in that a base (19) of the U-shaped recess (17) has a protrusion (20). 4. Bonnet lock according to one or more of the preceding claims, wherein the rotary latch (9) is accommodated in a rotary latch holder, characterized in that the rotary latch (9) further comprises a counter-stop (21) which interacts directly with the rotary latch holder. VG3SF 258 024 22 791 DE Munich/Paris/Western 11.3.1998