EP1541789B1 - Motor vehicle lock, in particular for a boot lid or a rear hatch - Google Patents

Description

The present invention relates to a motor vehicle lock, in particular for a trunk lid or a rear door of a motor vehicle, having the features of the preamble of claim 1.

The known motor vehicle lock, from which the invention proceeds and which is particularly suitable and suitable for a trunk lid or a rear door of a motor vehicle ( DE 195 05 779 A1 ), is advantageous because the electric motor drive can be controlled without the need of a return spring with a rotating in a direction of rotation drive element in block operation and thus without a microswitch.

The well-known, previously explained motor vehicle lock is further designed to ensure that in case of failure of the electric motor drive by an emergency operation by hand, the pawl can be moved at any time in the Aushebestellung.

Altogether allowed for the constructive background of motor vehicle locks of the type in question and for the particularities just in motor vehicle locks for trunk lid or rear doors on the DE 195 05 779 A1 Reference is also made to the disclosure of the present patent application by reference.

In the previously described, known motor vehicle lock of the driver pin is in the strict sense, a cylindrical component. Within the meaning of the teaching of the present patent application, however, a cam-like component or a component having another different shape, for example an elliptical shape, is to be regarded as a driving pin. Instead of a cylindrical pin in the narrower sense, it has already been provided in the prior art, the drive with a degressive start-up characteristic Mistake. This means that when starting a large moment can first be applied to release the pawl from the engaged position on the latch, in the course of the lifting movement of the pawl this moment is continuously reduced by the shape of the driving pin. In particular, a helical control cam as a driving pin has been naturalized here ( DE 101 00 008 A1 respectively. WO 03/071065 A1 ). In that regard, it is also known to realize a step-shaped reduction of the moment by differently long lever action arms ( DE 41 19 703 C1 ). However, the latter is not realized with a circulating in one direction drive element of an electric motor drive, but realized in a motor vehicle lock with manual over a stepwise engaging coupling of an opening handle to the pawl.

The teaching of the present patent application is based on the problem to optimize the known, initially explained motor vehicle lock with respect to the opening function, taking into account the specifics of an electric motor drive with a rotating in one direction drive element and a realization of a block operation for the drive.

The above-explained problem is solved in the motor vehicle lock with the features of the preamble of claim 1 by realizing the features of the characterizing part of claim 1. According to the invention, preferably designed as a drive pulley drive element of the electric motor drive is not provided with only one, but with two driving pins. These are in different positions, in particular in different radial position on the drive element. The second driving pin is preferably designed as a helical control cam and makes the actual lifting of the pawl with a large force on the pawl, so a large reduction ratio. The first driving pin is freed from its function of actually lifting the pawl and realized only with a small force on the pawl, but comparatively higher speed, the Überhubbewegung the pawl and then the block operation.

This has succeeded in a particularly suitable for an electric motor drive with a rotating in one direction drive element Way to realize a two-stage opening movement of the pawl without having to introduce additional lever. This means that a high force is available for lifting the pawl, but this is then gradually reduced in favor of a fast path to be covered. By this type of reduction on the drive element can be overcome with a comparatively small electric drive motor, as it is normally used for central locking drives, large holding forces on the latch.

Preferred embodiments and further developments of the motor vehicle lock according to the invention are the subject of the dependent claims.

Fig. 1

eine schematische, perspektivische Darstellung eines Kraftfahrzeugs mit einem Kraftfahrzeugschließsystem,

Fig. 2

ein Ausführungsbeispiel eines erfindungsgemäßen Kraftfahrzeugschlosses, ausgeführt als Schloß für eine Hecktür, die Schloßfalle in Hauptschließstellung, die Sperrklinke eingefallen,

Fig. 3

das Ausführungsbeispiel aus Fig. 2, die Sperrklinke in Aushebestellung und

Fig. 4

das Ausführungsbeispiel aus Fig. 2, den Antrieb durch Blockbetrieb abgeschaltet.

In the following the invention will be explained in more detail with reference to the drawing with reference to a preferred embodiment or preferred embodiments. In the course of this explanation, further refinements and developments and further features, properties, aspects and advantages of the invention will be explained. In the drawing shows

Fig. 1

a schematic, perspective view of a motor vehicle with a motor vehicle locking system,

Fig. 2

An embodiment of a motor vehicle lock according to the invention, designed as a lock for a rear door, the lock latch in the main closed position, the pawl incident,

Fig. 3

the embodiment Fig. 2 , the pawl in the out position and

Fig. 4

the embodiment Fig. 2 , shut off the drive by block operation.

In the figures of the drawing, the same reference numerals are used for the same or similar parts. This is intended to indicate that corresponding or comparable properties and advantages are achieved, even if a repeated description of these parts is omitted.

Fig. 1 shows a schematic representation of a motor vehicle 1 with an only partially indicated motor vehicle locking system 2. This has in particular a plurality of motor vehicle locks 3, namely those for side doors 4, for a trunk lid 5, possibly for a tailgate or tailgate, but also for a glove box, a Tank cover o. The like .. In the illustrated embodiment, the installation positions of the motor vehicle locks 3 by arrows in Fig. 1 indicated schematically.

In the illustrated embodiment, it is indicated that the motor vehicle locks 3 are motor-operated, in particular electromotively unlockable and lockable and / or electric motor-openable motor vehicle locks.

Fig. 2 to 4 Now show a motor vehicle lock according to the present invention, which is particularly intended and suitable for a trunk lid or a rear door of a motor vehicle. Fig. 2 shows the closed position of the motor vehicle lock, Fig. 3 shows the order and Fig. 4 shows the block shutdown for this motor vehicle lock.

The illustrated motor vehicle lock initially has a latch 6, which is designed in the illustrated embodiment and according to the most common embodiment as a rotary latch. At the latch 6, which is pivotally mounted on a pivot axis 7, there is a main catch 8, which is used in the main closed position of the latch 6, and a preliminary catch 9, which is used in a prelocking this latch 6. The Vorrast occasionally falls away.

The latch 6 is held in the main closed position and in the illustrated embodiment in the prelocking position of a pawl 10. This is pivotally mounted on a pivot axis 11 and latched to the main catch 8 or pre-catch 9 of the latch 6 by means of a corresponding locking lug 12. The closing elements of the motor vehicle lock are sheathed in the illustrated embodiment with plastic or partially designed as plastic parts, wherein the engaging force-transmitting areas lie free in the metal.

The illustrated embodiment shows that the pawl 10 is a one-piece component. In principle, however, the pawl 10 could also be coupled with a further locking lever, which then transmits movements to the pawl 10.

At the pawl 10 or just at the coupled with the pawl locking lever an actuating surface 13 is provided at a distance from the point of engagement with the latch 6, so here at a distance from the latch 12. Also provided is an electric motor drive 14 with a circumferential in one direction, in the illustrated embodiment, counterclockwise rotating, here and preferably designed as a drive pulley drive 15. At this designed as a drive pulley drive element 15 is eccentrically arranged a driving pin 16. Other drive elements 15 have For example, club shape or ellipse shape or even just the shape of a one-armed pivot lever.

By rotation of the drive element 15 of the driving pin 16 runs on the actuating surface 13, moves the pawl 10 in an overrun position lying beyond an overstroke position and then runs past the actuating surface 13. You can see that in the transition from Fig. 3 to Fig. 4 well imagine. The Aushebestellung the pawl 10 is the position in which the locking lug 12 with the main catch 8 and the pre-catch 9 of the latch 6 is not engaged, the latch 6 so easily swing out about its pivot axis 2 clockwise in the direction of the open position.

It goes without saying that 10 spring elements are provided for the lock latch 6 and the pawl, which bias them into the respective desired position, the latch 6 so in the open position, the pawl 10 in the engaged position. Two springs can also be replaced by a spring acting on both closing elements. For this purpose, reference may be made to the state of the art as a whole, which has already been explained in the introduction.

On the pawl 10, which is coupled to the pawl 10 locking lever or a separate from the pawl 10, but with this motion-coupled blocking lever is in the direction of rotation of the drive element 15th seen at a distance behind the actuating surface 13 a driver stop surface 17 is arranged. This is in befindlicher in Aushebestellung pawl 10 in the path of movement of the driving pin 16 ( Fig. 4 ) in the engaged position pawl 10 but outside the path of movement of the driving pin 16 (FIG. Fig. 2 ).

When in the open position located latch 6, the latch 6 holds the pawl 10 in the Aushebestellung ( Fig. 4 ). This makes it possible that the driving pin 16 starts after passing on the actuating surface 13 at befindlichem in Aushebestellung pawl 10 on the stop surface 17 and thereby the electric motor drive is turned off (block operation). The pawl 10 and the locking lever or the separate locking lever are fixed by the latch 6, so that the necessary resistance to the start of the driving pin 16 results, which can be exploited for block operation.

Block operation means shutdown by torque monitoring, current monitoring, time monitoring or a combination of different types of monitoring. Also in this respect may be made to the state of the art, which has been explained in the introduction.

In so far as the arrangement has been described above, this description still corresponds to what has already been realized in such a motor vehicle lock in the prior art.

According to the invention it is now provided that the driving pin 16 does not make the actual lifting of the pawl 10 from the engagement position on the latch 6, that the drive element 15, a second eccentrically arranged driving pin 18 and the pawl 10 and the locking lever with the second driving pin 18th cooperating opening control surface 19 is provided that at the start of the drive 14 for lifting the pawl 10 from the main closed position initially the second driving pin 18 with the opening control surface 19 engages and only then the first driving pin 16 engages with the actuating surface 13 and that the effective Reduction ratio with respect to the second entrainment pin 18 is greater than with respect to the first entrainment pin 16. By this division on the first driving pin 16 and the second driving pin 18 is an optimal torque loading of the pawl 10 at the beginning of the lifting movement with a quick adjustment of the pawl 10 to the end of the lifting movement, in particular in the overtravel combined. The known from the prior art, realized by double leverage graded startup characteristic is realized here only by using a further driving pin 18 on the drive element 15. This is very simple, convenient and inexpensive.

The illustrated and so far preferred embodiment shows, moreover, that the pawl 10 and the locking lever is arranged in registration with the drive element 15 and that the first driving pin 16 is arranged radially further out on the drive element 15 than the second driving pin 18. One can the different Easy to understand lever arm ratios that lead to the desired different reduction effect.

In this embodiment, it is further provided that the opening control surface 19 is located farther from the point of engagement with the latch 6 than the stop surface 17. In fact, the stop surface 17 is near a lower reversal point of the first driving pin 16, if the pawl 10 is in the raised position ( Fig. 4 ). Thereby, the stop surface 17 engages with the shortest possible lever arm with respect to the pivot axis 11 on the pawl 10, so far as the blocking effect of the stop surface 17 with as little force as possible between the latch 6 and the pawl 10 is accompanied, so that the total bending stress of the pawl 10th kept as low as possible.

The illustrated and preferred embodiment further shows a slot-like design of the second driving pin 18 such that the second driving pin 18 extends from a point near the center of the drive member 15. It is envisaged that, as practiced in the prior art, the second driving pin 18 is designed as a helical cam control cam.

The illustrated and preferred embodiment has a further special feature in that both driving pins 16, 18 lie on one side of the drive element 15, in particular in a plane with respect to the pawl 10 and the locking lever or the blocking lever. The fact that both drive pins 16, 18 lie in one plane, the introduction of force into the pawl 10 and the locking lever or the blocking lever is particularly effective.

Finally, in particular, shows Fig. 3 a special feature of the illustrated embodiment of a motor vehicle lock according to the invention, which is based on the fact that the first driver pin 16 with the actuating surface 13 only comes into engagement after the lifting of the pawl 10 is completed by the second driving pin 18. So here is a transfer from one to the other driving pin. In principle, it would also be possible to perform the influencing effect in an overlapping manner, whereby, of course, one must take into account that no static overdetermination occurs.

Claims (7)

1. Motor vehicle lock, in particular for a boot lid or a rear hatch of a motor vehicle,
   with a lock latch (6) designed in particular as a rotary latch, and a pawl (10) keeping the lock latch (6) in a main locking position and optionally in a pre-locking position,
   wherein an actuating surface (13) is provided on the pawl (10) or on a blocking lever, which is coupled to the pawl (10) and transmits movements to the pawl (10), at a distance from an engagement point with the lock latch (6),
   with an electromotive drive (14) having a driving element (15) which revolves in one direction, is preferably designed as a driving disc and has a driver lug (16) arranged eccentrically thereon, wherein, by rotation of the driving element (15), the driver lug (16) strikes against the actuating surface (13), moves the pawl (10) into an excess travel position located on the far side of a raised position and then runs past the actuating surface (13),
   wherein a driver stop surface (17) is arranged on the pawl (10) or on the blocking lever coupled to the pawl (10) or on a blocking lever which is separate from the pawl (10), but is coupled to the latter in terms of movement, at a distance behind the actuating surface (13), as seen in the direction of rotation of the driving element (15), said driver stop surface, when the pawl (10) is in the raised position, lying in the path of movement of the driver lug (16) but, when the pawl (10) is in the engagement position, lying outside the path of movement of the driver lug (16),
   wherein the lock latch (6) in the opening position keeps the pawl (10) in the raised position, and wherein the driver lug (16), after running past the actuating surface (13) when the pawl (10) is in the raised position, strikes against the stop surface (17) and the electromotive drive (14) is switched off by said striking action (blocking mode),
   characterized in that the driver lug (16) does not perform the actual raising of the pawl (10) out of the engagement position on the lock latch (6),
   in that a second eccentrically arranged driver lug (18) is provided on the driving element (15) and an opening control surface (19) which interacts with the second driver lug (18) is provided on the pawl (10) or on the blocking lever,
   in that, when the drive (14) is started up to raise the pawl (10) out of the main locking position, the second driver lug (18) first of all comes into engagement with the opening control surface (19) and only then does the first driver lug (16) come into engagement with the actuating surface (13), and
   in that the effective step-down ratio is greater with respect to the second driver lug (18) than with respect to the first driver lug (16).
2. Motor vehicle lock according to Claim 1, characterized in that the pawl (10) or the blocking lever is arranged spatially overlapping the driving element (15), and in that the first driver lug (16) is arranged on the driving element (15) further outwards radially than the second driver lug (18).
3. Motor vehicle lock according to Claim 2, characterized in that the opening control surface (19) lies further away from the engagement point with the lock latch (6) than the stop surface (17), and in particular the stop surface (17) is arranged in the vicinity of a lower reversal point of the first driver lug (16).
4. Motor vehicle lock according to one of the preceding claims, characterized in that the second driver lug (18) starts from a point in the vicinity of the centre point of the driving element (15).
5. Motor vehicle lock according to one of the preceding claims, characterized in that the second driver lug (18) is designed as a control slot in the shape of a screw curve.
6. Motor vehicle lock according to one of the preceding claims, characterized in that both driver lugs (16; 18) lie on one side of the driving element (15), in particular in a plane with respect to the pawl (10) or the blocking lever.
7. Motor vehicle lock according to one of the preceding claims, characterized in that the first driver lug (16) comes into engagement with the actuating surface (13) only after the raising of the pawl (10) by the second driver lug (18) is finished.

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