DE102007052890A1 - Motor vehicle door lock - Google Patents

Abstract

The invention relates to a motor vehicle door lock, with a locking mechanism (3, 4) and with a closing / opening device (10 to 18), which by means of at least one motor (10) with the interposition of a transmission device (11 to 17), the locking mechanism (3, 4 ), wherein the transmission device (11 to 14) with variable drive torque to the locking mechanism (3, 4) works.

Description

The The invention relates to a motor vehicle door lock, with a locking mechanism, and with a closing / opening device, which by means of at least one motor with the interposition of a transmission device the lock is applied.

Closing devices in motor vehicle door closures generally serve to assist the closing operation of an associated motor vehicle door. This results from the realization that often only the pre-locking position is achieved, especially in heavyweight doors and slamming. In order to still be able to ensure a perfect closure, the closing device ensures that the locking mechanism is transferred to the main locking position. Here, more or less large opposing forces would have to be overcome, which are usually applied by a door rubber seal. An example of such a closing device is in the DE 20 2004 001 850 U1 described.

In addition, there are opening devices for locking mechanism, as they are the subject of DE 10 2004 052 599 A1 are. Here, following an opening signal, an opening movement is effected on the rotary latch in the closing direction of the rotary latch, namely until the pawl can be lifted or adjusted. As a result, the associated locking mechanism can be opened by motor.

The known procedures have proven to be fundamentally But then come to limits when large forces either overcome during the opening process or during the closing process Need to become. Especially when closing a Motor vehicle door today increase the forces disproportionately high. That leaves attributed to the increasing desire of automobile manufacturers, wind noise To keep as effectively as possible from the interior. As a result this is resorted to tight-fitting door rubber gaskets, their restoring forces when closing the door are not negligible. Nevertheless, a flawless Closure to ensure even a secure closure the motor vehicle door in the event of an accident As a result of this, relatively large motors are used worked for the closing device. These are not only expensive, but often also expansive and difficult to set up. Both properties are contrary to previous efforts, Reduce costs and save space, for example, additional units in the doors (side airbags, speakers, windows etc.) at all to be able to accommodate. This is where the invention starts.

Of the Invention is based on the technical problem of a motor vehicle door lock to further develop the embodiment described above, that with a compact and inexpensive construction nevertheless high Actuating forces can be generated.

to Solution of this technical problem proposes the invention in a generic motor vehicle door lock before, that the transmission device with variable drive torque on the locking mechanism works. This is usually done so that the drive torque of the transmission device first rises and then remains in the range of a maximum value, respectively after exceeding of the relevant maximum value slightly decreases again.

The The invention is based on the knowledge that in particular when pulling a motor vehicle door first rising restoring forces overcome and then the drive torque can be reduced or does not need to be further increased. This can be essentially the property of door rubber gaskets attributed to their deformation in the course the door closing initially rising Build restoring forces and after crossing a certain deformation usually even sinking restoring forces produce. In any case, the invention bears this particular Deformation behavior of door rubber gaskets bill.

Thereby, that the transmission device with variable drive torque and in particular a rising to the maximum value drive torque works, the engine can be relatively small and inexpensive be executed. Nevertheless, the desired Functionality achieved. Mostly follows the rise of variable drive torque of the transmission device an exponential function which is asymptotically the maximum value approaches. It is also possible in principle that the drive torque after reaching the maximum value slightly (again) drops.

This Course of the drive torque is achieved by a special kinematics of the transmission device for Provided. For this purpose, the transmission device advantageously has a crank mechanism, which advantageous to a rotary member or Rotary element is connected, in turn, applied by the motor becomes. In an advantageous embodiment, the crank mechanism is set essentially a first crank arm and a second crank arm together.

The first crank arm is regularly connected to the rotary element acted upon by the engine, while the second crank arm is connected to the first Crank arm enters into a pivotal connection and pivoted about a stationary axis. In this way, the first crank arm not only ensures that the second crank arm pivotally connected thereto makes pivoting movements about the stationary axle, as a result of which the locking mechanism is ultimately loaded, but at the same time an angle enclosed by the two crank arms also changes. This will be explained in more detail with reference to the description of the figures.

Of the Crankshaft respectively the second crank arm operates on a drive lever. The drive lever acts on its part in a contour on the locking mechanism engaging latch. Here are the drive lever and the pawl usually connected by a swivel joint. The swivel is usually acted upon by a spring, which ensures that the drive lever and the pawl a predetermined Include angle to each other, although against spring force can be changed, but with the help of the spring after the end a force is taken again.

Of the Crank drive is usually in a connection point to the rotary element connected, which is rotated by means of the motor in rotation. In most cases, the first crank arm of the crank mechanism is a swivel-jointed Connection with the said connection point. Looking at the Movement of this connection point, for example during the closing process, so does the connection point between its starting point and end point in about half a turn.

Around ultimately, and overall, that of the transmission facility on the ratchet applied drive torque to a high To raise the level, it has been proven, if that of the Motor applied rotary member to which the crank mechanism connected is designed as a gear transmission. Mostly come at this Make two intermeshing gears to Insert, namely a first gear of small diameter, which is carried by a worm wheel, which directly with a worm on an output shaft of the engine meshes. This first small diameter gear engages in a second In contrast, a gear with multiple diameter, so that the rotational movement of the output shaft of the engine as a whole a reduction experiences and a considerable torque on the output side of the second gear and thus of the rotary element in total to Available.

This Torque will now be in turn with the help of the subsequent Crank drive increased, and variable, as already described has been. As a result, the invention contributes in particular a Zuziehvorgang occurring different restoring forces Invoice and is particularly well adapted to these. As a result of this comes a small-scale and cost-effective engine for use. Here are the main benefits.

in the The invention will be described below with reference to a purely exemplary embodiment descriptive drawing explained in more detail; show it:

1 the motor vehicle door lock according to the invention with its essential elements and a closing device,

2 a detail from 1 in different functional positions and

3a and 3b a front and rear view of the locking mechanism.

In the figures, a motor vehicle door lock is shown, which basically consists of a motor vehicle door lock 1 and one only in 3a indicated lock holder 2 composed. The motor vehicle door lock 1 is arranged inside a motor vehicle door, not shown, whereas the lock holder 2 For example, may be posted to the body in the area of a B-pillar.

The motor vehicle door lock or the motor vehicle door lock 1 has a locking mechanism 3 . 4 which one in particular in the 3a recognizes. This is made up of a rotary latch 3 and a pawl 4 together, working together in the usual way. That is, to the locking mechanism 3 . 4 to bring into its closed position, moves the lock holder 2 in the catch 3 one, leaving the pawl 4 first in a Vorrast 5 and then a main stop 6 the catch 3 incident.

In the 1 you can still recognize an inlet mouth 7 into which the lock holder 2 enters the described process. In addition, the shows 1 a combined and for the further considerations unessential engine 8th , which takes over a central locking and anti-theft function and at the same time provides or can provide, insert a child safety device. Finally, components of an actuating / locking lever chain 9 shown, which are also of minor importance for the further considerations.

Decisive for the invention is now a closing / opening device 10 . 11 . 12 . 13 . 14 . 15 . 16 . 17 and 18 , in the present case as a closing aid 10 to 18 is designed. The closing / opening device 10 to 18 or the closing aid 10 to 18 has one as an electric motor 10 engine running 10 , wel cher with the help of an output shaft 11 and a snail 12 on a first gear 13 is working. The first gear 13 has a small diameter and is made by one with the snail 12 worn worm wheel. The first gear 13 with a small diameter meshes with a second gear 14 considerably larger diameter, so that in this way a rotary element 13 . 14 is provided, which is designed as a gear transmission and of the engine 10 can be offset in rotations and provides a reduction of the motor rotation.

In the present case, the second gear performs 14 for closing the locking mechanism 3 . 4 in about half a turn, as in the comparison of the two end positions according to the 2 becomes clear. For this purpose, the second gear moves 14 in the illustration according to the 1 and 2 clockwise.

To the rotary element 13 . 14 or the second gear 14 is a crank mechanism 15 . 16 connected, which in turn on a drive lever 17 works, the one at the end of the drive chain described a pawl 18 applied. The handle 18 is present and not limiting as Zuziehklinke 18 educated.

The closing pawl 18 engages in a contour 19 at the rotary latch 3 a, in the embodiment as Zuziehkontur 19 is designed. That is the case when the electric motor 10 is applied in the attracting sense and the second gear 14 moved in a clockwise direction. Because in this case ensures the Zuziehkontur 19 retractable closing pawl 18 for that the catch 3 in the illustration 3a is pivoted clockwise and for example safely from its pre-locking position in the pre-rest 5 recessed pawl 4 in the main lodge with in the main lodge 6 recessed pawl 4 as shown transferred.

The closing / opening device or closing aid 10 to 18 is according to the invention and in principle from the already mentioned motor or electric motor 10 and one of them acted upon transfer facility 11 to 18 together, in the end the locking mechanism 3 . 4 acted as described, in the embodiment ensures that the catch 3 is drawn. Of particular importance, it is now according to the invention that the transmission device 11 to 18 with variable drive torque on the ratchet 3 . 4 is working. In fact, the drive torque of the transmission device increases 11 to 18 first and reaches a maximum value. The drive torque essentially follows an exponential function which asymptotically approaches the maximum value. This maximum value is either maintained or the drive torque falls slightly after exceeding the aforementioned maximum value.

To accomplish this in detail, the transmission facility has 11 to 18 about the already mentioned crank drive 15 . 16 , This crank mechanism 15 . 16 is as described to the rotating element 13 . 14 connected and is acted upon by this.

Actually, the crank drive is set 15 . 16 from a first crank arm 15 and a second crank arm 16 together, which are pivotally connected to each other. The first crank arm is to the rotary member 13 . 14 connected, in the present case is a pivotal connection with the second gear 14 in the area of a connection point A with this one. Based on 2 it can be seen that the said connection point A performs approximately a 180 ° or half turn when the engine 10 the transmission device 11 to 18 applied in a moving sense. In fact, one in the correspond 2 to be recognized starting position and end position of said connection point A to two positions of this connection point A, which are diametrically opposed to an axis 20 of the second gear 14 are opposite.

As a result, this increases from the crank mechanism 15 . 16 on the drive lever 17 and consequently the closing pawl 18 and thus the locking mechanism 3 . 4 applied torque initially. This can be attributed to the fact that the connection point A at the described and in 2 indicated movement the first crank arm 15 increasingly raises and at the same time in this lever movement of the lever arm between the connection point A and the axis 20 and thus increases the torque. Consequently, that grows on the first crank arm 15 attacking torque. This reaches about its maximum when the connection point A - starting from the representation after 1 - made an approximately 90 ° turn.

Subsequently, the drive torque drops, but not significantly, because the crank drive 15 . 16 or the two crank arms 15 . 16 along with this movement increase their included angle between them. This angular magnification between the crank arms 15 . 16 in turn extends the effective lever arm from connection point A to the stationary axis 21 around which the second crank arm 16 of the crank mechanism 15 . 16 pivoted. This will compensate for some of the first crank arm 15 reaching and decreasing torque achieved. As a result, the drive torque so increases, remains in the range of a maximum value or falls slightly after exceeding this maximum value again.

Anyway, that goes over the closing pawl 18 on the catch 3 applied drive torque initially almost exponentially in order to achieve asymptotically a maximum value, which is essentially maintained until the end of the closing process or until reaching the end point, respectively at most slightly decreases. This is the transmission device 11 to 18 able to overcome with the thus constructed variable drive torque increasing restoring forces when closing the vehicle door. All this is possible with little design effort by resorting to a relatively small and thus inexpensive to build and compact engine 10 ,

Finally, one recognizes that the second crank arm 16 of the crank mechanism 15 . 16 around a fixed axis 21 pivoted to the described angle change between the crank arms 15 . 16 to be able to represent. The drive lever 17 and the latch 18 are about a swivel 22 connected with each other. An associated spring ensures that both parts 17 . 18 maintain the same angle to each other. Reinforcement plates for holding on the one hand the rotary element 13 . 14 and on the other hand, the crank mechanism 15 . 16 Overall, they ensure that the functionality is maintained when the force is applied.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 202004001850 U1 [0002]
• - DE 102004052599 A1 [0003]

Claims (10)

Motor vehicle door lock, with a locking mechanism ( 3 . 4 ), and with a closing / opening device ( 10 to 18 ), which by means of at least one motor ( 10 ) with the interposition of a transmission device ( 11 to 18 ) the locking mechanism ( 3 . 4 ), characterized in that the transmission device ( 11 to 14 ) with variable drive torque on the locking mechanism ( 3 . 4 ) is working. Motor vehicle door lock according to claim 1, characterized in that the drive torque of the transmission device ( 11 to 18 ) initially rises and remains in the range of a maximum value or falls slightly after exceeding the maximum value. Motor vehicle door lock according to claim 1 or 2, characterized in that the transmission device ( 11 to 18 ) a crank drive ( 15 . 16 ) having. Motor vehicle door lock according to claim 3, characterized in that the crank drive ( 15 . 16 ) essentially from a first crank arm ( 15 ) and a second crank arm ( 16 ). Motor vehicle door lock according to claim 4, characterized in that the first crank arm ( 15 ) to one of the engine ( 10 ) acted upon rotary element ( 13 . 14 ) connected. Motor vehicle door lock according to one of claims 4 or 5, characterized in that the second crank arm ( 16 ) to the first crank arm ( 15 ) is pivotally connected and about a fixed axis ( 21 ) pivots. Motor vehicle door lock according to one of claims 1 to 6, characterized in that the crank drive ( 15 . 16 ) on a drive lever ( 17 ), which in turn creates a contour ( 19 ) at the locking mechanism ( 3 . 4 ) engaging pawl ( 18 ). Motor vehicle door lock according to one of claims 1 to 7, characterized in that the drive lever ( 17 ) and the pawl ( 18 ) via a spring-loaded rotary joint ( 22 ) are interconnected. Motor vehicle door lock according to one of claims 1 to 8, characterized in that a connection point (A) of the first crank arm ( 15 ) to the rotary element ( 13 . 14 ) from the starting point to the end point in about half a turn. Motor vehicle door lock according to one of claims 1 to 9, characterized in that the rotary element ( 13 . 14 ) is designed as a gear transmission with reduction.