Closing aid for a motor vehicle lock and motor vehicle lock with closing aid

Abstract

The invention relates to a motor vehicle lock (1) having a closing aid (2, 2'), comprising: a locking mechanism (3) having a rotary latch (16) and at least one locking pawl (17), wherein the rotary latch (16) can be latched in a preliminary latching position and a main latching position by means of the locking pawl (17); and an electrically actuatable drive pawl (12), wherein the rotary latch (16) can be moved from a preliminary latching position into a main latching position by means of the drive pawl (12) and at least part of the drive pawl (12) can be guided at least by means of a control contour (8), at least part of the drive pawl (12) being engageable by means of the latching pawl (7, 7').

Description

[0001] Description

[0002] Pulling aid for a motor vehicle lock and motor vehicle lock with pulling aid

[0003] The invention relates to a pulling aid for a motor vehicle lock and to a motor vehicle lock with a pulling aid comprising a locking mechanism with a rotary latch and at least one pawl, wherein the rotary latch can be locked in a pre-latch and a main latch position by means of the pawl, an electrically actuated, movable drive pawl, wherein the rotary latch can be moved from a pre-latch position to a main latch position by means of the drive pawl and the drive pawl can be guided at least partially by means of a control cam.

[0004] The demands placed on modern motor vehicles, and especially the demands on user comfort, are constantly increasing. One goal of the automotive industry is to make closing movable components on the vehicle, such as hatches or doors, as easy as possible for the operator. The functionality and features of the vehicle's locking mechanism play a crucial role in this.

[0005] The automotive locks according to the invention contain a locking mechanism. A locking mechanism consists of a rotary latch and a pawl, which, in conjunction with a lock holder (usually fixed in place), can be moved into a latched position. Consequently, if an open locking mechanism is moved relative to a lock holder, the rotary latch moves into a closing position and is finally locked in a closed or latching position by means of the pawl. Locks are available with one or two latching positions, i.e., a pre-latching position and a main latching position, and there are locking mechanisms equipped with one, two, or more pawls to achieve one or two latching positions within the locking mechanism. The locking behavior is generally differentiated into manual and electrically assisted operation.

[0006] The rotary latch and pawl form the locking mechanism. For example, when an open side door of a motor vehicle is closed, a catch arm of the rotary latch, as part of the rotary latch's engagement jaw, first engages with the lock holder, which is attached, for example, to a B-pillar of the motor vehicle. The relative movement of the door to the lock holder pivots the rotary latch, causing a spring-loaded pawl with, for example, a detent on the rotary latch to engage. When the detent is reached, only a slight preload is applied to the rotary latch.

[0007] When the door is fully closed, two different mechanisms can be used. Firstly, the door can be closed manually by moving the door leaf beyond the pre-latch position into a closed position, closing the door against a door seal. This movement is sufficient to pivot the rotary latch far enough for the locking pawl to engage in the main latch position. The contact areas between the locking pawl and the rotary latch in the latch positions are usually made of metal, which can result in a metallic noise. A buffer on the rotary latch, and in particular a buffer formed by a plastic casing on the rotary latch, can reduce this noise.

[0008] Alternatively, the locking mechanism can be electrically assisted from the pre-latch position to the main latch position by means of a pulling aid. For this purpose, a mechanism, in particular a lever mechanism, engages the rotary latch and moves it from the main latch position into an overtravel position, allowing the pawl to engage. After reaching the overtravel position and engaging the rotary latch, the electrically actuated pulling aid is deactivated, so that the pawl engages with the main latch of the rotary latch.

[0009] When the vehicle lock is unlocked electrically or manually, meaning the locking pawl is moved out of the engagement area with the rotary latch, high forces are exerted on the rotary latch. The force acting on the locking pawl from the rotary latch results, on the one hand, from a rotary latch spring, which is spring-loaded in the opening direction, and on the other hand, from the force acting on the rotary latch from the vehicle door seal. The force from the door seal is significantly greater than the force from the rotary latch spring. When the locking pawl is moved out of the engagement area with the rotary latch, which is usually done using a release lever, a snapping noise occurs precisely at the moment the locking pawl leaves the rotary latch. It can also happen that the closing process is interrupted, namely if the door lock is reopened while closing.To enable simple and easy electric or manual opening of the lock, a detent element was incorporated into the engagement area between the rotary latch and the pawl, as described in EP 3 870 786 B1. The detent element is pivotally mounted in the rotary latch, with both the detent element and the pawl being concentric to their respective bearing points within their engagement area, thus allowing a rolling motion between the detent element and the pawl. This design of the lock enables easy and simple opening with minimal force. When the lock is opened, the detent element pivots sufficiently to generate an opening moment within the lock, resulting in its automatic opening.An opening moment in the engagement area with the rotary latch leads to a situation where, when the blockage of the pawl is lifted, an independent opening occurs in the locking mechanism.

[0010] A closing aid for a lock of the type mentioned above is known from publication WO 2010 / 142280 Al. The closing aid comprises a drive unit with which the rotary latch can be moved by motor power from the pre-latch position to the fully latched position, thus fully closing an associated door or flap. The drive unit includes a closing latch, called a pull bar, which is movable by the motor. During closing, the closing latch rests against a bolt of the rotary latch, so that the rotary latch can be rotated from the pre-latch position to the fully latched position by motorized movement of the closing latch. The closing latch is then moved back to its initial position. Once the closing latch has reached its initial position, the lock can be opened again.

[0011] Moving the locking latch back to its initial position takes time. During this time, the lock cannot be opened. Therefore, it is known from EP 3 445 933 B1 that the locking latch is moved out of the engagement area with the rotary latch immediately after the locking process. The printed document discloses a locking aid for a motor vehicle lock with a rotary latch that can be locked by at least one pawl in a pre-latch position and in a main latch position, in order to move the rotary latch from the pre-latch position to the main latch position by motor power, wherein the locking aid comprises a movable locking latch for locking by motor power, and wherein the locking latch can be moved from an initial position to an end position along a first path for locking, with the return movement of the locking latch from the end position to the initial position occurring along a second path.The lock can therefore be reopened immediately after the closing process has ended.

[0012] The solutions known from the prior art have generally proven effective and offer good approaches, but are in need of improvement. In particular, the use of the smallest possible electric motors to operate the locking functions depends on the ease of operation of the functional elements. This is where the invention comes in. The object of the invention is to enable easy and immediate interruption of the closing action, which, moreover, requires only a small number of components and allows for a space-saving design.

[0013] The problem is solved by the features of independent claim 1. Advantageous embodiments of the invention are specified in the dependent claims. It should be noted that the exemplary embodiments described below are not limiting; rather, any number of variations of the features described in the description and the dependent claims are possible.

[0014] According to claim 1, the object of the invention is achieved by providing a closing aid for a motor vehicle lock and a motor vehicle lock with a closing aid, comprising a locking mechanism with a rotary latch and at least one pawl, wherein the rotary latch can be locked in a pre-latching and a main latching position by means of the pawl, an electrically actuated drive pawl, wherein the rotary latch can be moved from a pre-latching position to a main latching position by means of the drive pawl, and the drive pawl can be guided at least partially by means of a control contour and wherein the drive pawl can be engaged at least partially with a locking pawl. The inventive design of the closing aid now makes it possible to fix the drive pawl in the actuating lever in order to ensure a reliable transmission of the closing force from the actuating lever to the drive pawl.The detent pawl acts directly on the drive pawl or a bearing point of the drive pawl, thus ensuring the interaction and transmission of force to the rotary latch. During the closing process, the drive pawl itself is directly engaged with the rotary latch. However, it is also conceivable that, for example, a cylindrical bolt is mounted on the rotary latch, which can be used to engage the drive pawl. The drive pawl is at least partially engaged with a control contour, and the detent pawl can fix the drive pawl in a position within the control contour. In other words, the detent pawl holds the drive pawl in a closing position within the control contour. This offers the advantage that the closing process itself can be immediately interrupted by actuating the detent pawl during the closing process.Interrupting the closing process is advantageous because the rotary latch is immediately released and the opening of the lock can be initiated immediately.

[0015] For example, if the operator issues an opening command during the closing process, stopping the drive for the drive pawl and simultaneously releasing the locking pawl from its engagement with the drive pawl, the transmission of the closing torque or closing force to the rotary latch is immediately interrupted. Since the drive pawl can now move freely within the control contour after being released from the locking pawl, it can move out of the engagement with the rotary latch immediately after the operator's opening command. Regardless of any return movement of the closing drive and any associated mechanism, the rotary latch is released, and the opening of the lock can be initiated.There is no need to wait for the closing drive to reset; the drive pawl can release the drive force and free the rotary latch by disengaging from the locking pawl, thus enabling the rotary latch to move in an opening direction.

[0016] The detent holds the drive pawl in the engaged position until an opening command is initiated by the operator, at which point the detent disengages from the drive pawl. The detent can also be described as a blocking device, particularly a blocking lever, since it prevents free movement of the drive pawl within the control contour. Detent, detent blocking device, and blocking lever are therefore synonymous.

[0017] In one embodiment of the invention, the drive pawl is guided by means of the locking pawl. When a door is closed with a door closer according to the invention, the closing movement moves the rotary latch at least into a pre-latching position. A pre-latching position is characterized by the fact that the locking pawl engages with the rotary latch, but the door is not yet completely closed. Upon reaching the pre-latching position of the locking mechanism, a signal is generated, which is detected, for example, by a microswitch, which then initiates the closing process. A door closer motor, which can be mounted on the vehicle lock or arranged at a distance from the vehicle lock, actuates an actuating lever, the actuating lever being pivotably mounted in the vehicle lock.The transmission of the closing force from the motor to the actuating lever can be achieved, for example, via a gearbox or via a gearbox and a Bowden cable. In each case, a closing force is transmitted to the actuating lever so that the drive pawl mounted in the actuating lever can transmit a closing force to the rotary latch. During the closing process, the detent pawl holds the drive pawl in the closing position, thus enabling a reliable transmission of the closing force and allowing the rotary latch to be moved from a pre-lock position to a main locking position. If the lock is equipped with a single locking pawl, the closing process releases the locking pawl from the pre-lock position and moves the rotary latch into an overtravel position.Upon reaching the overtravel position, the pawl can engage freely in a main detent surface of the rotary latch and, after the closing process is complete and the drive pawl returns to its starting position, securely hold the rotary latch in the main detent position. During the closing process, the drive pawl is guided by the detent pawl.

[0018] The drive pawl is held in a closed position by means of the detent pawl. In other words, the detent pawl secures the drive pawl in a position that allows the closing force to be transmitted to the rotary latch. Advantageously, the drive pawl is held in a position within the actuating lever by the detent pawl during the closing process. It can also be advantageous if the drive pawl is mounted in a cam guide. The drive pawl is driven by an actuating lever. The drive pawl itself is mounted in a cam guide. The cam guide allows the drive pawl to move within the cam guide after being released by the locking lever or the detent pawl. The path traversed within the cam is designed such that immediately after the drive pawl is released by the detent pawl, it disengages from the rotary latch.This ensures that the closing process is immediately interrupted and that the lock can be opened.

[0019] It has proven advantageous that the cam guide can be arranged on an actuating lever. By arranging the cam guide directly on the actuating lever, the number of components required for a closing interruption is reduced to a minimum. The actuating lever also serves an additional function. On the one hand, the actuating lever transmits the closing force from the closing motor to the drive pawl, which is its primary function. On the other hand, the actuating lever itself can act as a means of closing interruption. This occurs when the drive pawl is released from the locking pawl and can move freely within the cam guide. The movement curve of the drive pawl's bearing point in the cam guide is selected such that the restoring force of the rotary latch can easily and reliably move the drive pawl out of engagement with the rotary latch.The scenery is advantageously angled, at least in some areas.

[0020] In another embodiment, the drive pawl is held in place within the cam guide by means of a detent pawl. The detent pawl, or locking lever, is integrated into the vehicle lock in such a way that the drive pawl remains in the cam guide even during the closing process. In other words, the detent pawl follows the movement of the drive pawl and holds it in a specific position within the cam guide.

[0021] It has proven particularly advantageous if the detent pawl is rotatably mounted on the actuating lever itself. By mounting the detent pawl on the actuating lever, it can directly follow the movement of the drive pawl. The actuating lever itself serves as the pivot point for the detent pawl, so that pivoting the actuating lever simultaneously moves the detent pawl. If the drive pawl is held in the guide track within the actuating lever and the detent pawl is mounted on the same arm as the guide track, a structurally simple system for guiding the drive pawl can be implemented. The detent pawl and drive pawl are moved in the same direction by the actuating lever, thus enabling a structurally simple design for guiding the drive pawl.

[0022] A further advantage arises when the drive pawl is held in engagement with the cam guide by means of the detent pawl and a rotatable retaining element, in particular a roller. In this design, the drive pawl is indirectly fixed in the cam guide via a rotatable retaining element. It has proven particularly advantageous if the retaining element is designed as a roller. In other words, the detent pawl holds the drive pawl indirectly in the cam guide via a roller. This has the advantage that when the detent pawl is disengaged, a rolling motion is performed with the drive pawl. The detent pawl rolls on the retaining element, resulting in easy and quiet release of the detent pawl.The drive pawl remains in the cam guide, but unlike in the preceding embodiments, it is not held in the cam by the detent pawl. Instead, the roller, acting as a holding element, is subjected to a holding force by the detent pawl. The roller or holding element can, for example, be integrally connected to a bearing shaft of the drive pawl in the cam guide. The bearing shaft of the drive pawl and the holding element can also be formed as a single unit. Preferably, the drive pawl, the bearing shaft of the drive pawl, the roller, the actuating lever, and the detent pawl are made of a metallic material to ensure reliable and long-term stability in transmitting the high forces required for the closing forces. To minimize noise, the aforementioned drive components can also have a plastic coating, at least in certain areas.

[0023] The inventive design of the closing aid allows for easy interruption of the closing movement, and in particular, interruption with low force. The force required to interrupt the closing function is especially low because only the supporting force of the pawl needs to be overcome. If the pawl acts directly on a bearing axis of the drive pawl, only a force supporting the closing force in the cam of the actuating lever is needed to transmit the closing force to the rotary latch. In the preferred embodiment, in which an additional holding element, for example in the form of a cylindrical roller, is provided, moving the pawl out of engagement with the drive pawl is further facilitated by the pawl rolling motion on the holding element. Only a small force is required to release the pawl from the supporting or locking element.The locking lever moves the latch out of the locking position, thus interrupting the closing process. The closing force itself is transmitted to the drive pawl via the operating lever. The locking lever merely supports the position of the drive pawl in the guide. Consequently, a smooth and quiet interruption of the closing function can be achieved.

[0024] To further improve the puller according to the invention, it can be advantageous if a spring element can be engaged with the detent pawl and the drive pawl. A combined spring support for the detent pawl and the drive pawl can reduce the number of components required for spring support to a minimum and simultaneously improve the functionality of the puller. The spring element holds the drive pawl in an engaged position, thus enabling reliable engagement with the rotary latch. At the same time, the spring element holds the detent pawl in the detent position, so that a supporting effect can be introduced into the detent pawl. Thus, the reliability of the puller's function can be increased with minimal design effort.

[0025] It can also be advantageous if the drive pawl can be engaged with a stop on the housing. A stop, in combination with a spring element, can provide an additional guide for the drive pawl. The stop can act as a guide during the closing process and simultaneously provide an end stop for retracting the drive pawl. Additionally, the stop, in combination with the cam guide, can provide a means that allows and / or assists the drive pawl to pivot immediately after the detent pawl is released from engagement with the drive pawl, thus enabling quick and controlled disengagement of the drive pawl from the rotary latch.

[0026] In one embodiment of the invention, the locking pawl can be released from its engagement with the drive pawl by means of the locking pawl. To reduce the number of components required for improved closing interruption, the locking pawl can be assigned an additional function. If the locking pawl is arranged and designed such that, when the locking mechanism is unlocked, it is both moved out of its engagement with the rotary latch and actuates the locking pawl, thus releasing the locking pawl from its engagement with the drive pawl, then the closing function can be interrupted with minimal design effort. The locking pawl thus has a dual function. On the one hand, the locking pawl serves to engage the rotary latch in the pre- and main detent positions, and on the other hand, the locking pawl serves as a release lever for the locking pawl.In addition to actuating the ratchet by the locking pawl, according to the invention it is also possible that a release lever, which actuates the locking pawl, simultaneously actuates the ratchet in such a way that the ratchet is released from the engagement with the drive pawl or the holding means.

[0027] It can be advantageous for the pawl to have a release arm. To enable easy and reliable force transmission to the pawl, the pawl can have a release arm. In addition to the light actuation force described above for moving the pawl out of engagement with the drive pawl, the release arm can also provide a lever arm that facilitates releasing the pawl from engagement with the axle or the drive pawl. This additional lever arm on the pawl further reduces the force required to move it out of engagement with the drive pawl. Therefore, the inventive design of the pulling aid allows the pulling process to be interrupted with a low force.

[0028] When a motor vehicle lock is mentioned in the context of the invention, this includes motor vehicle locks that are used, for example, in side doors, sliding doors, flaps, hoods and / or covers, wherever pivotally movable or slidably mounted components are arranged on the motor vehicle.

[0029] The vehicle lock has a locking mechanism comprising a rotary latch and at least one pawl. Preferably, at least one pawl is arranged in the same plane as the rotary latch and is capable, in conjunction with the lock holder, of locking the rotary latch in a specific position. When the locking mechanism is open, the entry jaw of the rotary latch points towards the lock holder, and a relative movement between the lock holder and the rotary latch causes the rotary latch to pivot. The pawl is generally biased towards the rotary latch so that, upon reaching a detent position, the pawl engages with the rotary latch or the detent element.

[0030] To unlock the lock, a release lever is used, the release lever interacting with the lock and preferably with the pawl in such a way that the locked lock can be unlocked by moving the release lever. The release lever is, for example, pivotally mounted in the vehicle lock and capable of moving at least one pawl out of the engagement area with the rotary latch. Systems with one, two, or even three pawls are used. For example, it is conceivable that the pre-lock position is provided with a separate pawl, with the pawl interacting with another pawl in the main lock position, the second pawl being held in engagement with the rotary latch by a third pawl, which can also be called a blocking lever or locking lever.

[0031] The vehicle lock constructed according to the invention is particularly suitable for an electrically operated vehicle lock. As already explained in the introduction, an electrically operated vehicle lock is unlocked by means of an electric drive, preferably an electric motor with a downstream gearbox. It can therefore be unlocked particularly easily because only small forces act between the rotary latch and the pawl during the unlocking process. There is no immediate tearing, i.e., a release of the pawl from the detent element, but rather the pawl first rolls on the detent element, which reduces the force, in particular the sealing force acting on the rotary latch of, for example, a tailgate, so that there is a low surface pressure between the detent element and the pawl when the pawl releases from the detent element.Furthermore, the ability to set a high locking ratio results in lower overall surface pressures between the locking pawl and the detent element. The vehicle lock according to the invention is therefore particularly suitable for electrical unlocking of the locking mechanism, so that an electrically operated lock, a so-called e-lock, can advantageously be provided.

[0032] When the door, flap, or sliding door closes, the locking mechanism engages with the latch. The rotary latch has an engagement area, also known as a fork opening, which consists of a catch arm and a load arm. The latch first engages with the catch arm and pivots the rotary latch until the locking pawl engages in a pre-latch or main latch position. In the main latch position, a high load acts on the rotary latch, preferably generated by a seal on the door or flap. A rotary latch spring, which additionally applies force to the rotary latch in the opening direction, also generates a force, but this is much less than the sealing force acting on the rotary latch in the opening direction.

[0033] In the locked state, and especially in the main locking position of the locking mechanism, the load arm of the rotary latch engages with the lock holder. The load or force that develops between the lock holder and the rotary latch then acts on the load arm of the rotary latch. The force on the load arm, the distance of the lock holder's engagement point on the load arm, and the distance of this engagement point on the load arm to the axis of the rotary latch constitute the measure for calculating the locking ratio. The increasing force, which manifests as torque in the rotary latch, is counteracted by the pawl. The pawl provides the opposing force and, relative to the distance between the pawl's engagement point and the axis of the rotary latch, the corresponding counter-torque for holding the lock holder in the vehicle lock.

[0034] The invention is explained in more detail below with reference to the accompanying drawings and a preferred embodiment. However, it is important to note that the embodiment does not limit the invention but merely represents an advantageous configuration. The features shown can be implemented individually or in combination with other features described in the description and claims.

[0035] Fig. 1 shows a side view of a motor vehicle lock equipped according to the invention, wherein only the components of the motor vehicle lock necessary for explanation are shown.

[0036] Fig. 2 shows a detailed view of the actuating lever with a cam guide, and

[0037] Fig. 3 shows a view of the puller with an additional holding element between the ratchet and the drive pawl.

[0038] Figure 1 shows a side view of a vehicle lock 1 with a pull-out aid 2 and a locking mechanism 3. The pull-out aid 2 has an actuating lever 4, a bearing axis 5 for the actuating lever 4, a bearing axis 6 for a pawl 7, and a cam guide 8. In this embodiment, the actuating lever 4 is pivotably mounted in a metallic support arm 9. The actuating lever 4 can be actuated, for example, via a Bowden cable 10 and by means of a pull-out drive 11. The pull-out drive 11 can be located at a distance from the vehicle lock 1 or on the vehicle lock 1 itself. By actuating the pull-out drive 11, the actuating lever 4 can be pivoted clockwise about the bearing axis 5. Pivoting the actuating lever 4 causes a drive pawl 12 to move in the direction of arrow P.

[0039] The drive pawl 12 is received in the cam guide 8 via a bearing shaft 13. The bearing shaft 13, and thus the drive pawl 12, is fixed or held in the cam guide 8 by a detent pawl 7. The drive pawl 12 has an engagement section 14, which can be brought into engagement with a closing contour 15 of a rotary latch 16. When the actuating lever 4 pivots about the contact axis 5, the drive pawl 12 moves in the direction of the closing contour 15, so that a closing force originating from the closing drive 11 can be transmitted via the Bowden cable 10 to the actuating lever 4, to the drive pawl 12, and thus to the rotary latch 16. By means of the drive pawl 12 the rotary latch 16 can be moved from a pre-latching position shown in figure 1 to a main latching position .The main locking position, and in particular the position of the rotary latch 16 in the main locking position, is shown by way of example and is additionally included in Figure 1. The rotational movement during the closing process can be seen from the angle ' shown in Figure 1, whereby the closing contour 15 can be moved into position 15' by the closing process. The rotary latch 16 is therefore shown in the figure in the pre-lock position and the main locking position. A pawl 17 holds the rotary latch 16, or rather, locks the rotary latch 16 in both the pre-lock position and the main locking position. The illustrated locking mechanism 3 therefore has a single pawl 17. Figure 1 shows the vehicle lock 1 in a pre-lock position. The pre-lock position can be queried, for example, via a microswitch, whereby, for example, the position of the rotary latch 16 can be detected by the microswitch 18.In the exemplary embodiment, the microswitch 18 generates a signal that activates the closing drive. The closing drive 11, via the Bowden cable 10, applies load to the actuating lever; in particular, the Bowden cable 10 generates a tensile force F, causing the actuating lever 4 to pivot clockwise around the axis 5. The detent pawl 7 engages with the bearing shaft 18 of the drive pawl 12 and holds the bearing shaft 13 in a defined position within the cam guide 8. The detent pawl 7 is pivotally movable on the actuating lever 4, and in particular on the part of the actuating lever 4 on which the cam guide 8 is also located. Consequently, the detent pawl 7 is also moved by the pivoting movement of the actuating lever 4, so that the detent pawl 7 guides the drive pawl 12 during the closing process.The pivoting movement of the actuating lever 4 moves the drive pawl 12 in the direction of arrow P, causing the engagement section 14 with the closing contour 15 to engage the rotary latch 16. During the closing process, i.e., the transition of the rotary latch from the pre-latch to the main latch, the rotary latch 16 is pivoted by the angle α and around the bearing axis 19. The pivoting movement of the rotary latch 16 is illustrated by the two positions of the closing contour 15, 15'. In the end position of the rotary latch 16, the rotary latch 16 is moved against a stop buffer 20 before the locking pawl 17 moves into the main latch, allowing the rotary latch 16 to move from the overtravel position to the main latch position.

[0040] To illustrate the interruption of the closing process, the actuating lever 4 is now shown in Figure 2 detached from the locking mechanism 3 and without the ratchet 7 and drive pawl 12.

[0041] As can be clearly seen, the cam guide 8 is formed integrally with the actuating lever 4. The bearing axis 13 of the drive pawl 12 is visible within the cam guide 8. In this end position of the cam guide 8, the drive pawl 12 is held by the detent pawl 7 during the closing process. The cam guide 8 is angled within the actuating lever 4. If, during an interruption of the closing process, the detent pawl 7 is disengaged from the bearing axis 13 or the drive pawl 12, the bearing axis 13 or the drive pawl 12 can move along the cam guide. The angled shape of the cam guide 8 allows the drive pawl to pivot out of the engagement with the rotary latch 16.A first angled section 21 of the cam guide 8 causes the drive pawl 12 to perform a pivoting movement, resulting in the immediate release of the engagement section from the closing contour 15, 15'. A second section 22 of the cam guide 8 then causes the drive pawl to move completely out of the path of movement of the rotary latch 16.

[0042] Figure 3 illustrates the interruption of the closing process itself using a slightly modified embodiment of the closing aid. The closing aid 2' is shown with a modified bearing shaft 13', which has a roller section 23. The also slightly modified detent pawl 7' engages with the roller section 23 of the bearing shaft 13'. A spring element 24 engages the detent pawl 7' with a first spring leg 25 and the drive pawl 2 with a second spring leg 26. The spring element 24 secures the position of the detent pawl 7' in the holding position for the drive pawl 12 and simultaneously secures the position of the drive pawl 12 itself. The drive pawl 12 rests against a stop 27. A detent element 28 can be engaged with the stop 27, so that an end position for the movement of the drive pawl 12 and thus also for the actuating lever 4 can be realized.

[0043] If the closing process is interrupted, a release lever 29 can be moved electrically or manually. The counterclockwise movement of the release lever around the axis 30 of the pawl 17 causes the pawl to disengage from the rotary latch 16 and move in the direction of arrow PI, in accordance with the movement of the release lever 29. In this embodiment, an actuating arm 31 is integrally formed with the pawl 17, so that the pivoting movement of the pawl 17 around the axis 30 in the direction of arrow PI causes the actuating arm 31, with an extension 32, to engage the detent pawl 7'. The actuating arm 31 then disengages the detent pawl 7' from the bearing axis 13' or the roller section 23.The drive pawl is released and can move along the cam guide 8, thereby pivoting the drive pawl 12 around the stop 27 and subsequently moving along the second section 22 of the cam guide 8. Interrupting the closing process thus immediately releases the drive pawl 12 from engagement with the rotary latch, allowing the door element to open immediately after unlocking the lock 3. The lever arm or extension 32 on the latch 7' and the latch 7''s sole supporting function for holding and fixing the latch 12 in the cam guide 8 allow for easy interruption with low force.

[0044] Reference symbol list

[0045] 1 motor vehicle lock

[0046] 2.2 ' Pull-in aid

[0047] 3 locks

[0048] 4 operating levers

[0049] 5, 6, 13, 13', 19, 30 Bearing axle

[0050] 7, 7 ' Latch

[0051] 8 scenery guide

[0052] 9 support arm

[0053] 10 Bowden cable

[0054] 11 Pull-in drive

[0055] 12 drive pawl

[0056] 14 Intervention section

[0057] 15, 15' Pull-in contour

[0058] 16 Rotary Trap

[0059] 17 Locking pawl

[0060] 18 micro switches

[0061] 20 bump stops

[0062] 21, 22 first and second section of the stage tour

[0063] 23 Roll section

[0064] 24 spring element

[0065] 25, 26 spring legs

[0066] 27 attacks

[0067] 28 locking elements

[0068] 29 Release lever

[0069] 31 Actuating arm

[0070] 32 extension

[0071] P, PI arrow

[0072] Angle of pull force

Claims

Patent claims 1. Motor vehicle lock (1) with a closing aid (2, 2') comprising a locking mechanism (3) with a rotary latch (16) and at least one pawl (17) , wherein the rotary latch (16) can be locked in a pre-latch and a main latch position by means of the pawl (17), an electrically actuated drive pawl (12) , wherein the rotary latch (16) can be moved from a pre-latch position to a main latch position by means of the drive pawl (12) and the drive pawl (12) can be guided at least partially by means of a control contour (8) , characterized in that the drive pawl (12) can be engaged at least partially by means of a detent pawl (7, 7').

2. Motor vehicle lock (1) according to claim 1, characterized in that the drive pawl (12) can be guided by means of the detent contour (7, 7').

3. Motor vehicle lock (1) according to one of claims 1 or 2, characterized in that the drive pawl (12) can be held in a closed position by means of the locking pawl (7, 7').

4. Motor vehicle lock (1) according to one of claims 1 to 3, characterized in that the drive pawl (12) is recorded in a behind-the-scenes tour (8).

5. Motor vehicle lock (1) according to claim 4, characterized in that the cam guide (8) can be arranged on an actuating lever (4).

6. Motor vehicle lock (1) according to claim 4 or 5, characterized in that the drive pawl (12) is held in a cam guide (8) by means of the locking pawl (7, 7').

7. Motor vehicle lock (1) according to one of claims 4 to 6, characterized in that the drive pawl (12) is held in engagement with the cam guide (8) by means of the locking pawl (7, 7') and a rotatable retaining means, in particular a roller (23).

8. Motor vehicle lock (1) according to one of claims 1 to 7, characterized in that a spring element (24) can be engaged with the latching pawl (7, 7') and the drive pawl (12).

9. Motor vehicle lock (1) according to one of claims 1 to 8, characterized in that the latching pawl (7, 7') can be released from engagement with the drive pawl (12) by means of the locking pawl (17).

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