Motor vehicle door lock

Abstract

A motor vehicle door lock which is equipped with a locking mechanism that consists essentially of a rotary latch and a pawl. Also, at least one actuating lever chain for opening the locking mechanism in an emergency is provided. In addition, a control element which blocks the actuating lever chain indirectly or directly in normal operation and releases it in the event of an emergency, is provided. The control element is equipped with an electric motor having an output element.

Claims

1. A motor vehicle door lock comprising: a locking mechanism having a rotary latch and a pawl, an actuating lever chain for opening the locking mechanism in an emergency, and a control element which blocks the actuating lever chain in normal operation and releases the actuating lever chain when the emergency occurs, wherein the control element has an electric motor and an output element; wherein: the control element further has a worm gear operated by the electric motor, and the output element meshes with the worm gear and has a blocking contour; the actuating lever chain comprises an outer actuating lever and a coupling element that operatively couples the outer actuating lever to the locking mechanism, and the outer actuating lever has an abutment surface; the output element is rotatable by interaction with the worm gear between a blocking position and a release position; in the blocking position the blocking contour abuts directly against the abutment surface thereby interacting directly against the abutment surface to prevent movement of the outer actuating lever, and in the release position the blocking contour is disengaged from the abutment surface to permit movement of the outer actuating lever; and the output element is arranged in a plane below a plane of the outer actuating lever, and the blocking contour extends from the plane of the output element to the plane of the outer actuating lever for interacting against the abutment surface.

2. The motor vehicle door lock according to claim 1 further comprising a sensor, wherein the electric motor is activated as a function of signals from the sensor.

3. The motor vehicle door lock according to claim 2, wherein the sensor is configured to detect a crash.

4. The motor vehicle door lock according to claim 1, wherein the control element interacts directly with the outer actuating lever of the actuating lever chain.

5. The motor vehicle door lock according to claim 1 further comprising a flexible connecting element for coupling the actuating lever chain to a handle, wherein the control element interacts indirectly with the actuating lever chain and selectively blocks and releases the flexible connecting element.

6. The motor vehicle door lock according to claim 5, wherein the flexible connecting element is a Bowden cable.

7. The motor vehicle door lock according to claim 1 further comprising a lock housing, wherein the control element is arranged in an interior of the lock housing.

8. The motor vehicle door lock according to claim 1, wherein during the normal operation, the locking mechanism can only be opened by electric motor power.

9. The motor vehicle door lock according to claim 1, wherein the worm gear is rotatable in a plane that is parallel to a plane in which the outer actuating lever is rotatable.

10. The motor vehicle door lock according to claim 1, wherein the actuating lever chain is coupled mechanically to an outer door handle.

11. A motor vehicle door lock comprising: a locking mechanism having a rotary latch and a pawl, an actuating lever chain for opening the locking mechanism in an emergency, and a control element which blocks the actuating lever chain in normal operation and releases the actuating lever chain when the emergency occurs, wherein the control element has an electric motor and an output element; wherein: the control element further has a worm gear operated by the electric motor, and the output element meshes with the worm gear and has a blocking contour; the actuating lever chain comprises an outer actuating lever and a coupling element that operatively couples the outer actuating lever to the locking mechanism, and the outer actuating lever has a connector element that is articulated on an end of the actuating lever; the output element is rotatable by interaction with the worm gear between a blocking position and a release position; and in the blocking position the blocking contour abuts directly against the connector element thereby interacting directly against the connector element to prevent movement of the outer actuating lever, and in the release position the blocking contour is disengaged from the connector element to permit movement of the outer actuating lever.

12. The motor vehicle lock according to claim 11, wherein the output element pivots the blocking contour about an axis of the output element to disengage the blocking contour from the connector element.

13. The motor vehicle door lock according to claim 11, further comprising a flexible connecting element for coupling the actuating lever chain to a handle, wherein the flexible connecting element is connected to the connector element.

14. The motor vehicle door lock according to claim 13, wherein the flexible connecting element is a Bowden cable.

15. The motor vehicle door lock according to claim 11, further comprising a lock housing, wherein the control element is arranged in an interior of the lock housing.

16. The motor vehicle door lock according to claim 11, further comprising a sensor, wherein the electric motor is activated as a function of signals from the sensor.

17. The motor vehicle door lock according to claim 16, wherein the sensor is configured to detect a crash.

18. The motor vehicle door lock according to claim 11, wherein during the normal operation, the locking mechanism can only be opened by electric motor power.

19. The motor vehicle door lock according to claim 11, wherein the worm gear is rotatable in a plane that is parallel in a plane in which the outer actuating lever is rotatable.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) The invention is explained in greater detail below with reference to drawings which show two exemplary embodiments. In the drawings:

(2) FIG. 1 shows a motor vehicle door lock according to the invention in a first design variant in normal operation,

(3) FIG. 2 shows the subject according to FIG. 1 in emergency opening mode,

(4) FIG. 3 shows a motor vehicle door lock according to the invention in a second variant in normal operation,

(5) FIG. 4 shows the subject according to FIG. 3 in emergency opening mode.

DETAILED DESCRIPTION

(6) The drawings show a motor vehicle door lock which has a locking mechanism 1, 2, merely indicated schematically in FIG. 1, which comprises at least a rotary latch 1 and a pawl 2. The locking mechanism 1, 2 in the interior of the motor vehicle door lock or in the interior of a lock housing 3 interacts with a body-side closing bolt or striker 4, as is indicated in the drawings and as has been sufficiently described previously in the prior art. For this purpose the closing bolt 4 moves into an inlet opening 5 in the lock housing 3, in order to be able to interact with the rotary latch 1. In the respective FIGS. 1 to 4 the relevant locking mechanism 1, 2 is shown in the closed state with locking bolt or striker 4 moved in.

(7) Furthermore, a locking drive 6 is shown, which acts upon a coupling element 7. The coupling element 7, in combination with an actuating lever or outer actuating lever 8 and a triggering lever (not shown in greater detail), defines an actuating lever chain 7, 8. The outer actuating lever 8 can be pivoted about its axis 9. In this case a pivoting movement of the actuating lever or outer actuating lever 8 about the relevant axis 9 in the counter-clockwise direction indicated in FIG. 1 corresponds to the actuating lever or outer actuating lever 8 acting on the triggering lever, which for its part lifts the pawl 2 from its engagement with the rotary latch 1. In other words, in the present case the described counterclockwise movement of the outer actuating lever 8 leads to the so-called emergency opening of the locking mechanism 1, 2.

(8) In normal operation such emergency opening of the locking mechanism 1, 2 is not possible, because in this case a control element 10, 11, 12 directly blocks the actuating lever chain 7, 8 or, in the illustrated exemplary embodiment in FIG. 1, the outer actuating lever 8. Consequently, in normal operation the locking mechanism 1, 2 cannot be opened mechanically with the aid of the actuating lever chain 7, 8. Rather, the locking mechanism 1, 2 is opened by electric motor power. For this purpose an indicated control drive 13, 14 is provided, which serves as an opening drive for electrically opening the locking mechanism 1, 2.

(9) The control drive or opening drive 13, 14 for electrically opening the locking mechanism 1, 2 has an electric motor 13 and an output element 14, which is a worm gear 14, which meshes with the electric motor 13. Rotary movements of the worm gear 14 in normal operation and for opening of the locking mechanism 1, 2 are transmitted indirectly or directly to the triggering lever, which consequently the lifts the pawl 2 from its engagement with the rotary latch 1. For example, the control drive 13, 14 for electrically opening the locking mechanism 1, 2 can be constructed and can operate as described in detail in DE 10 2008 028 256 A1 in the name of the applicant.

(10) Consequently, in normal operation the control drive 13, 14 ensures the opening of the locking mechanism 1, 2 by electric motor power. In this case the actuating lever chain 7, 8 is blocked, specifically with the aid of the control element 10, 11, 12. On the other hand, if emergency opening of the locking mechanism 1, 2 is necessary, the control element 10, 11, 12 releases the actuating lever chain 7, 8. Thus in this case the locking mechanism 1, 2 can also be opened without operation of the control drive 13, 14. In the event of a crash it may be assumed that the electrical power supply of the electric motor 13 fails. Therefore in the emergency opening mode the locking mechanism 1, 2 can be opened by means of a flexible connecting element 15 in combination with a handle 16, which is an outer handle or an outer door handle 16.

(11) The distinction between the normal operating and the emergency opening mode is made as a function of signals from a sensor 17. The signals from the sensor 17, which is merely indicated in FIG. 1, are evaluated by a control unit 18. The actuating element 10, 11, 12 is acted upon by means of the control unit 18. For this purpose the control unit 18 is connected to an electric motor 10 as component of the control element 10, 11, 12.

(12) In addition to the electric motor 10, the control element 10, 11, 12 also has an output element 11. Moreover, the output element 11 is equipped with a blocking contour 12. The output element 11 meshes with a worm on an output shaft of the electric motor 10, so that the output element 11 is configured as a worm gear 11 in the present case. Consequently, the output element or worm gear 11 can carry out pivoting movements indicated in FIG. 1 about a central axis in a clockwise direction and a counterclockwise direction.

(13) Depending upon the position of the blocking contour 12 by comparison with the outer actuating lever 8, the blocking contour 12 abuts an abutment surface 19 of the outer actuating lever 8. In this case the outer actuating lever 8 cannot be pivoted about its axis 9, as illustrated in FIG. 1. On the other hand, the functional position in FIG. 2 corresponds to the control element 10, 11, 12 releasing the actuating lever chain 7, 8 for emergency opening of the locking mechanism 1, 2. In the functional position according to FIG. 2 the abutment surface 19 of the outer actuating lever 8 is released by the blocking contour 12 as a component of the control element 10, 11, 12, so that the outer actuating lever 8 can carry out the counter-clockwise movement about its axis 9 as indicated in FIG. 2. For this, it is merely necessary that the outer door handle 16 is acted upon manually.

(14) Consequently, the flexible connecting element 15 also undergoes a corresponding deflection, which is transmitted to the outer actuating lever 8, so that this lever is pivoted about its axis 9 in the counterclockwise direction as indicated in FIG. 2. In this way the outer actuating lever 8 can act on the triggering lever (not shown), which for its part lifts the pawl 2 from its engagement with the rotary latch 1. The locking bolt or striker 4 comes free from its engagement with the locking mechanism 1, 2. The motor vehicle door lock and the associated motor vehicle door are opened or can be opened.

(15) The mode of operation is as follows. FIGS. 1 and 2 show a first embodiment of the motor vehicle door lock according to the invention. This first embodiment is characterized in that the control element 10, 11, 12 there directly blocks the actuating lever chain 7, 8 in normal operation, as FIG. 1 shows. In normal operation the aforementioned blocking contour 12 of the worm gear 11 abuts the abutment surface 19 of the outer actuating lever 8. If in the functional position according to FIG. 1 the outer door handle 16 is acted upon manually and as a result the flexible connecting means 15 is deflected, this action of force is not converted into a pivoting movement of the outer actuating lever 8 about its axis 9. The counterclockwise pivoting movement of the outer actuating lever 8 indicated in FIG. 1 is blocked by the control element 10, 11, 12. This corresponds to normal operation.

(16) In other words, in normal operation corresponding to the representation in FIG. 1 in the first embodiment the locking mechanism 1, 2 there can be opened merely by electric motor powered with the aid of the control drive 13, 14—as previously already described. However if emergency operation and an emergency opening of the locking mechanism 1, 2 becomes necessary, a corresponding signal of the sensor 17 corresponds to this situation. The sensor 17 is advantageously a crash sensor. In other words, the sensor 17 can also be designed as a deceleration sensor or basically also as a voltage sensor, by means of which a crash or generally the lowering of an operating voltage of the motor vehicle body is detected. The corresponding signal from the sensor 17 is processed by the control unit 18. If the control unit 18 recognizes an emergency operation or a necessary emergency opening of the locking mechanism 1, 2, the control unit 18 acts upon the electric motor 10 as a component of the actuating element 10, 11, 12.

(17) In this case the electric motor 10 is supplied with current in such a way that the control element 10, 11, 12 moves from its position shown in FIG. 1 into the functional position according to FIG. 2. Consequently, starting from the functional position in FIG. 1, the output element or worm gear 11 carries out a movement about its central axis in the counterclockwise direction by approximately 180°. This corresponds to the position in FIG. 2.

(18) Since in the example the worm gear 11 is arranged in a plane below the outer actuating lever 8, by action on the outer door handle 16 in the functional position according to FIG. 2 the outer actuating lever 8 can be pivoted in the counter-clockwise direction about its axis 9 by means of the intermediate flexible connecting element 15, as indicated by the arrow in FIG. 2. As a result, in the described exemplary case emergency opening of the locking mechanism 1, 2 is possible.

(19) FIGS. 3 and 4 show another exemplary embodiment of the invention. In this case, the control element 10, 11, 12 ensures that the actuating lever chain 7, 8 is blocked indirectly in normal operation. Normal operation corresponds to the functional position in FIG. 3. It will be recognized that in this case the outer actuating lever 8 has a connected connector element 20. The connector element 20 is articulated on an end of the outer actuating lever 8 remote from the axis. Moreover, the connector element 20 ensures the connection of the flexible connecting element 15. By action upon the outer door handle 16 in normal operation corresponding to the representation in FIG. 3, the outer actuating lever 8 in turn cannot be pivoted about its axis 9.

(20) Such pivoting movements of the outer actuating lever 8 about its axis 9 are blocked by the worm gear 11 of the actuating element 10, 11, 12 coming into abutment with its blocking contour 12 on the connector element 20 or blocking the connector element 20. This corresponds to normal operation. In other words, in the functional position according to FIG. 3 the locking mechanism 1, 2 can again be opened merely by electric motor power by means of the electric opening drive or control drive 13, 14.

(21) If an emergency or crash occurs and emergency opening of the locking mechanism 1, 2 becomes necessary, the signal from the sensor 17 is again evaluated by means of the control unit 18. The control unit 18 acts upon the electric motor 10 in such a way that the worm gear 11 and, with it, the blocking contour 12 carries out a pivoting movement in the counterclockwise direction about approximately 45° starting from the functional position in FIG. 3. This can be recognized in the transition from FIG. 3 to FIG. 4. Consequently the connector element 20 articulated on the outer actuating lever 8 comes free from the blocking contour 12. Action on the outer door handle 16 now leads directly by means of the interposed flexible connecting element 15 to the outer actuating lever 8 being pivoted in the counter-clockwise direction about its axis 9 and in this way the pawl 2 lifts off from its engagement with the rotary latch 1 by means of the interposed triggering lever. Emergency opening of the locking mechanism 1, 2 takes place.

(22) A common feature of both embodiments is that the control element 10, 11, 12 in each case is arranged in the interior of the lock housing 3. Moreover, it will be recognized that in the present case the actuating lever chain 7, 8 is designed as an outer actuating lever. The actuating lever chain 7, 8 is coupled mechanically to the outer door handle 16 or an outer handle. Moreover, the outer actuating lever 8 is configured as a component of the relevant outer actuating lever chain or actuating lever chain 7, 8. In the illustrated exemplary embodiments the flexible connecting element 15 is a Bowden cable, but differently configured flexible connecting elements 15 or even a rigid connecting element such as a rod can be used in principle.

(23) Furthermore, the control element 10, 11, 12 is arranged in the region of the outer actuating lever 8. As a result, on the one hand, the control element 10, 11, 12 is accommodated and protected in the interior of the lock housing 3 and, furthermore, the control element 10, 11, 12 is arranged directly on the outer actuating lever 8, in order to be able to ensure the required blocking in normal operation and the release for emergency opening of the locking mechanism 1, 2 as described.