EP1225290A2 - Motor vehicle door lock - Google Patents

Abstract

A click-and-pawl drive (5) uses a driven pulley (DP) (6) to make an extension (13) on a detent pawl (2) release a rotary latch. The DP has a guide curve (15) for the extension moving along it. A near-center spiral readjusting spring (8) engages in a slot for the optional use of a manipulating tool while a far-center end rests against a stop. The click-and-pawl drive has an electric motor (5a) that engages the DP's outer screw thread by means of a worm gear (5b).

Description

The invention relates to a motor vehicle door lock, with a rotary latch and an associated pawl, and with a ratchet drive, the ratchet drive by means of a driven pulley on an extension the pawl acts to release the catch.

Such a motor vehicle door lock is described in US Pat. No. 5 020 838. To trigger the pawl there serves a ratchet motor, which in the driven pulley Rotation offset. For this purpose, the electrical Motor at the end with a worm wheel, which in a toothing realized at the edge of the driven pulley intervenes to rotate them.

Specifically, the driven pulley performs the triggering the pawl moves counterclockwise, so that the extension on the pawl is in contact with one Stop on the driven pulley occurs. Hence turns also the pawl counterclockwise and gives the Catch free. In addition, it is possible to use the pawl lifted manually using a lever to ensure safety and security Service aspects to be taken into account.

The well-known pawl drive can not in all points to satisfy. So it takes up a lot of space, what on the one hand with the stop on the driven pulley cooperating extension on the pawl and on the other hand, the additional manual that is independent of this Can release trigger lever. The more functions modern Motor vehicle door locks have to do so the more problematic will of course a ratchet drive, which is expansive. The manufacturing costs are too not inconsiderable in such a case. - Here she wants Total invention remedy.

The invention is based on the technical problem, one to further develop such a motor vehicle door lock, that it is as compact as possible with the same functionality is constructed.

To achieve this object, the invention proposes generic motor vehicle door lock that the Driven pulley a guide curve for the along this has moving extension. This is usually the guiding curve close to the axis compared to the axis of rotation of the driven pulley arranged and forms together with an off-axis Stop curve a guide slot for the extension. there can the guide curve as embedded in the driven pulley Spiral curve formed with end stops his. The same applies to the touch curve, so that overall and, according to a preferred embodiment, into the Output pulley recessed spiral slot with end Attacks is realized.

This already leads to a significant reduction in the Available space is reached. Because the driven pulley provides the necessary due to your material thickness Leadership or leadership curve for the extension of the Pawl available, mostly as essentially Executed at right angles from this protruding guide pin and dips into the spiral slot in question.

To ensure that the pawl is operated manually, has the guide slot in the starting position of the Pawl drive a manual lifting of the pawl permissible slot width for the extension. This Slot width of the guide slot in the driven pulley takes towards the end position of the pawl drive continuously. In this end position of the pawl drive corresponds essentially to the slot width the diameter of the extension so that the extension in the relevant position (end position of the pawl drive) is held or clamped.

The end position of the pawl drive usually corresponds to a position of the extension of the pawl, which in any case is a spring-assisted free Allows turning of the catch. In other words the end position of the pawl drive of a position the pawl, which goes beyond the position that is just necessary to release the catch.

So that the pawl drive as a whole after reaching its Return the end position to the start position can, the output pulley is mostly spiral Return spring equipped. The near center takes effect End of the spiral return spring usually into a slot while the far end abuts a stop. This allows the spiral Return spring different tension states easily take into account, because the far end of the center can slide along the associated stop.

The slot mentioned above also opens the Possibility of a manipulation tool, for example a screwdriver. That offers itself especially in the event that the described motor vehicle door lock without additional manual release options works for the pawl. Consequently, the Pawl even if the pawl drive fails or for service purposes, by using the Manipulation tool the slot on the driven pulley and so that the driven pulley itself is rotated, which the Extension and thus the pawl moves. Result from this not inconsiderable cost advantages.

These can be increased even more by being axially aligned release lever mounted in comparison to the pawl is provided, which has one end on the extension the pawl attacks and with its other end with an inner operating lever or the like triggering device communicates. Because uses in this way the release lever is advantageous between the driven pulley and pawl remaining space in which it is coaxial is rotatably supported compared to the pawl. A linkage or Bowden cable can be attached to this release lever connect, which with a manual operating lever communicates so that the motor vehicle door lock even if the drive fails or for service purposes can be opened.

This ensures that the motor vehicle door lock or the associated ratchet drive in each Case is in its initial position. This is ensured by spiral-shaped arranged on the back of the driven pulley Return spring. Because this transfers the pawl drive after the end of the application of an associated Electric motor reliably in the relevant starting position.

In this starting position, the one trained as a guide pin meets Extension on the pawl to a slot width of the spiral slot or guide slot, which the manual release of the pawl described.

The pawl drive has the one already mentioned Electric motor, which by means of a worm wheel meshes with an external thread of the driven pulley. Further at least a rubber stop ensures that the rotary movement the catch is limited and incidentally noises be avoided.

Finally, one or more switching elements are provided which interrogate the position of the rotary latch to its Submit position to a mandatory tax system. These switching elements are usually in one associated lock housing. An integrated electronic Circuit in the switching elements or in the motor vehicle door lock ensures the preparation of the switching elements position signals of the rotary latch and forwarding them via an external connection to control system already mentioned. This connection is designed as a connection terminal and also ensures an electrical power supply to the electric motor in Ratchet drive.

Fig. 1 und 2

verschiedene perspektivische Ansichten des erfindungsgemäßen Kraftfahrzeugtürverschlus-ses, reduziert auf seine wesentlichen Bau-teile,

Fig. 3 bis 5

nacheinander den kontinuierlichen Ablauf einer elektrischen Schlossöffnung mit Hilfe des Sperrklinkenantriebes und

Fig. 6

den Kraftfahrzeugtürverschluss in Offenstel-lung der Drehfalle in größtenteils komplet-tierter Darstellung.

The invention is explained in more detail below on the basis of a drawing illustrating only one embodiment; show it:

1 and 2

different perspective views of the motor vehicle door lock according to the invention, reduced to its essential components,

3 to 5

successively the continuous sequence of an electric lock opening with the help of the pawl drive and

Fig. 6

the motor vehicle door lock in the open position of the catch in a largely complete representation.

A motor vehicle door lock is shown in the figures, which in its basic features with a rotary latch 1 and one blocking the catch 1 in the closed position Pawl 2 is equipped. The catch 1 can Take the pre-locking and main locking position as the corresponding ones Stops 3 for the pre-locking position and 4 for the Make the main stop position clear (see Fig. 6).

In addition, a ratchet drive is part of the basic structure 5. This pawl drive 5 is exposed an electric motor 5a with an output shaft and formed thereon Worm gear 5b together, which has an external thread 5c combs on a driven pulley 6. This is the driven pulley 6 is able to rotate clockwise and counterclockwise to perform by the Electric motor 5a - controlled by a control system 7 - initiated become. As soon as the electric motor 5a no longer acts the output disk 6 rotates (and thus also the electric motor 5a) automatically in their Starting position back, as shown in FIGS. 1 and 3 is shown. This is ensured by a spiral return spring 8. This return spring 8 is shown 2 on the side facing away from the pawl 2 the driven pulley 6, that is on its back.

The spiral return spring 8 engages with its near center End in a slot 9, which is in an axial extension 10 of the driven pulley 6. twists the slot 9 correspond directly to Rotations of the driven pulley 6 about its axis 11. Das End of the spiral return spring 8 remote from the center abuts a stop 12.

As soon as the electric motor 5a from the control system 7 to rotation is applied, the worm wheel 5b engages in the External thread 5c of the driven pulley 6, so that this - starting in the starting position shown in FIG. 3 - rotates clockwise, as is an arrow in FIG. 4 suggests. At the same time, the return spring 8 is tensioned by the corresponding one also indicated in FIG. 2 Rotation. This continues until an extension 13 reaches a stop 14b on the pawl 2, which will be explained in more detail below.

In any case, such rotations of the driven pulley 6 as a result that the spiral return spring 8 tensions and at the same time their distant end at the corresponding end Stop 12 slides along or slide along can.

With the help of the slot 9 such rotations can Output disc 6 also made without motor support by using a suitable manipulation tool, z. B. a screwdriver is attached. The is required if, for example, the electric motor 5a should have failed and otherwise not the possibility exists to be able to lift the pawl 2 manually.

This lifting takes place within the scope of the exemplary embodiment electromotive through the interaction of a guide curve 15 with the already mentioned extension 13 on the Pawl 2. In addition to the guide curve 15 is also a Stop curve 17 provided in connection with the already mentioned end stop 14b and a start stop 14a a total of a guide slot 18 for the extension 13 form. This guide slot 18 is as in the Driven disk 6 recessed spiral slot 18 formed, what the size of the pawl drive 5 included Output disk 6 compared to the prior art positive affected.

In detail, the extension 13 mostly only moves along the guide curve 15 within the guide curve 15, stop curve 17 and the stops 14a and 14b formed Guide slot 18. For this purpose, the guide curve 15 close to the axis compared to the axis of rotation 11 of the Output disk 6 arranged and shapes as well as the opposite Stop curve 17 positioned off-axis Spiral. Consequently, the guide slot 18 also takes the Shape of the spiral slot 18 with the end stops 14a, 14b.

The guide slot 18 allows the pawl 2 to be lifted out manually in the initial position of the pawl drive (cf. FIGS. 1 and 3). For this purpose, the guide slot 18 is equipped with a slot width S ₁ for the extension 13 at this point, which corresponds to a multiple of the diameter D of the extension 13 (S ₁ ≈ 2.5 D). In particular, such a play of movement for the extension 13 is permitted that the pawl 2 can carry out the rotary movements shown in FIG. 3 by an arrow about its axis 19.

It can be seen that the movement clearance due to the selected slot width S _{1 is} sufficient for the catch 1 to be released. This means nothing else than that the motor vehicle door lock can be opened manually, either via the manipulation tool or screwdriver which engages in the slot 9 and which rotates the driven disk 6 or a release lever 20, which will be explained below and which is in the initial position of the pawl drive 5 acts directly on the extension 13 to rotate the pawl 2 about its axis 19.

The electric motor 5a and the associated worm wheel 5b are essentially at the same level compared to the driven pulley 6 arranged. In a plane parallel to this the pawl 2 moves between these two levels the trigger lever 20 already mentioned is positioned. In order to achieve the most compact possible design, the axis of rotation of the release lever 20 coincides with the axis 19 of the pawl 2 together, d. H. Release lever 20 and Pawl 2 are mounted axially with each other.

The trigger lever 20 is equipped with a slot 21, which encloses the extension 13. Against the power of one Pawl spring 22 can now trigger lever 20 in Press clockwise pulling, as shown in FIG. 1 indicates an arrow at the end. Because at this point is mostly a lever mechanism, a Bowden cable or the like connected, which of which of an (inner) operating lever is applied. This will cause the trigger to rotate 20 around the axis 19 clockwise (see FIG. 1) and pushes the extension 13 down so that the pawl 2 in the view of FIG. 1 clockwise and in Frame of FIGS. 3 to 5 is moved counterclockwise and the rotary latch 1 - supported by a rotary latch spring 23 - is released.

So that the motor vehicle door lock or the associated Pawl drive 5 under all circumstances in the 3 is located - both when the electric motor 5a is switched off and has failed the return spring 8 already mentioned provided that builds up the necessary restoring forces as soon as the Output pulley 6 from that shown in Fig. 3 Starting position moved to its end position shown in FIG. 5. This ensures that the trigger lever 20 in the described type can act.

The electromotive disengagement of the pawl 2 happens as follows. Going from the top position of the pawl 2 according to FIG. 3, it becomes clear at the transition to FIG. 4 that when the output disk 6 begins to rotate in Clockwise the extension 13 increasingly on the guide curve 15 is present. This extension 13 is considered essential Guide pin protruding from the pawl 2 at right angles 13 executed and dips almost completely into the guide slot 18. The concern with the leadership curve 15 happens approximately when the in Fig. 4th shown angular position of the driven pulley 6 is reached. Now the guide pin or extension 13 slides on the associated spiral guide curve 15 along.

Due to the spiral shape of the guide curve 15 with increasing The pawl moves radially from the axis 11 2 more and more down, so it performs a counterclockwise movement about its axis 19, if the Fig. 3rd considered to 5 in this order.

Shortly before the end position of the pawl drive 5 according to FIG. 5 has been reached, the pawl 2 has completely removed from the rotary latch 1, so that this - when acted upon by the rotary latch spring 23 - rotates into its open position and against a rubber stop 24 in the associated (motor vehicle door) Lock housing 27 strikes. The driven pulley 6 is moved over this position until the extension or guide pin 13 reaches the end stop 14b. At this point, the slot width S of the guide slot 18 has decreased to a value S ₂ , which essentially corresponds to the diameter D of the guide pin 13 (S ₂ ≈ D).

Consequently, the guide pin 13 in this end position the pawl drive 5 clamped or blocked. This ensures that the catch 1 under all circumstances is opened because manufacturing and installation tolerances no longer play a role.

Another rubber stop, not expressly shown ensures that the driven pulley 6 is unique takes its starting position. Because this rubber stop works with the stop 12 already described for the Return spring 8 together in the corresponding sense.

Finally, switching elements still belong to the basic structure 25, 26 (see FIG. 6), with the help of the angular position the rotary latch 1 queried and sent to the control system 7 is transmitted. For this purpose, the scope of the exemplary embodiment simple electrical switches 25, 26 are provided, which are designed as on / off switches and certain Report the rotary positions of the rotary latch 1 to the control system 7. For example, between the pre-locking and Main rest position can be distinguished. Are at the same time the switching elements 25, 26 with a not expressly shown integrated circuit inside the lock housing 27 connected, which is used for signal processing. Output lines of these switching elements 25, 26 are with Power supply lines for the electric motor 5a as accustomed to a connection block, which via a plug with the control system 7 in connection stands.

Claims (10)

Motor vehicle door lock, with a rotary latch (1) and an associated pawl (2), and with a ratchet drive (5), wherein the pawl drive (5) acts on an extension (13) on the pawl (2) to release the catch (1) by means of an output disk (6), characterized in that the output disk (6) has a guide curve (15) for the latter has along moving extension (13). Motor vehicle door lock according to claim 1, characterized in that the guide curve (15) is arranged close to the axis compared to the axis of rotation (11) of the driven pulley (6) and, together with a stop curve (17) remote from the axis, forms a guide slot (18) for the extension (13) , Motor vehicle door lock according to claim 1 or 2, characterized in that the guide curve (15) is designed as a spiral curve (15) let into the driven pulley (6) with end stops (14a, 14b) and preferably in connection with the stop curve one into the driven pulley ( 6) recessed spiral slot (18) with the end stops (14a, 14b) forms. Motor vehicle door lock according to one of Claims 1 to 3, characterized in that the guide slot (18) in the initial position of the pawl drive (5) has a slot width (S ₁ ) for the extension (13) which allows the pawl (2) to be lifted out manually, which in Direction towards the end position of the pawl drive (5) decreases continuously and here essentially corresponds to the diameter (D) of the extension (13), so that it is held in the relevant end position. Motor vehicle door lock according to one of claims 1 to 4, characterized in that the extension (13) on the pawl (2) is designed as a guide pin (13) projecting essentially at right angles from this. Motor vehicle door lock according to one of claims 1 to 5, characterized in that the driven pulley (6) is equipped with a preferably spiral return spring (8) for the entire pawl drive (5). Motor vehicle door lock according to claim 6, characterized in that the center end of the spiral return spring (8) engages in a slot (9) for the optional reception of a manipulation tool, while the center end lies against a stop (12). Motor vehicle door lock according to one of claims 1 to 7, characterized in that the pawl drive (5) has an electric motor (5a) which meshes via a worm wheel (5b) with an external thread (5c) of the driven pulley (6). Motor vehicle door lock according to one of claims 1 to 8, characterized in that at least one rubber stop (24) is provided to limit the rotary movement of the rotary latch (1). Motor vehicle door lock according to one of claims 1 to 9, characterized in that a release lever (20) which is mounted with the same axis as the pawl (2) and which engages with its end on the extension (13) of the pawl (2) and with its other End is connected to an internal operating lever or the like triggering device.

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