Locking device for a motor vehicle hood

Abstract

Locking device for a door or flap of a motor vehicle, comprising a locking mechanism consisting of a rotary latch (1) and at least one pawl (4) for locking the rotary latch and a puncture protection device in the form of a pivotably mounted blocking lever (29) with a motor drive, by means of which the pivotably mounted blocking lever (29) can be moved back and forth between its protective position and its non-protective position, wherein the drive moves a cam (31) on a circular path, characterized in that the cam (31) bears against a control contour (32) of a transmission element (33), and a rotary movement of the cam (31) brings about a pivoting movement of the blocking lever (29) by means of the control contour (32) and the transmission element (33) connected thereto.

Description

The invention relates to a locking device with a lock for a door or a flap and in particular for a hood of a motor vehicle with a locking mechanism. A locking mechanism comprises a rotary latch and at least one pawl for latching the rotary latch. The closing device comprises a breakdown protection in order to avoid mechanical damage.A lock of a locking device of the type mentioned at the beginning serves for temporarily closing openings in motor vehicles with the aid of doors or flaps. In the closed state of such a lock, the rotary latch engages with two arms around a locking bolt, which is in particular of bow-shaped design. If the rotary latch of such a lock reaches a closed position by pivoting starting from an open position, the rotary latch is finally latched by means of the pawl. Such pivoting is achieved by the striker (also referred to as a "striker" or "striker") when the latter falls into the rotary latch by closing an associated door or flap.DE 10 2013 022 059 A1 discloses a locking device having a lock for a door or a flap and in particular for a hood of a motor vehicle having a locking mechanism comprising a rotary latch and at least one pawl for latching the rotary latch. The closing device comprises a drive with which the locking mechanism can be moved such that a door gap or hood gap can be reduced in the closed state of the door or flap. The invention further relates to a method for closing the closing device. In particular, an electric lock is provided as the lock, which has an electric drive with which the locking mechanism can be brought into the main ratchet position of the locking mechanism and / or with which the lock can be opened.Furthermore, DE 10 2013 222 053 A1 discloses a locking device with a lock for a door or a flap and in particular for a hood of a motor vehicle with a locking mechanism comprising a rotary latch and at least one pawl for latching the rotary latch. The closing device comprises a drive with which the locking mechanism can be moved such that a door gap or hood gap can be reduced in the closed state of the door or flap. The invention further relates to a method for closing the closing device. It is an object of the invention to provide a closing device and a method with which a gap of a door or flap can be minimized. A striker, which may be attached to a frame or to the door, flap or hood, will fall into the rotary latch causing an impact. In order to avoid damage due to such dropping, a stopper for the rotary latch is attached to a plate. For reasons of stability, this plate is preferably made of metal and is fastened in particular to the body or to a door or flap of a motor vehicle. The panel may also be part of the body of a motor vehicle. Damage can be avoided by the stop.If a door or flap is closed at high speed, the locking bolt strikes the rotary latch with great force. Damage due to such an impact can be avoided by a breakdown protector. A breakdown protection, which can be, for example, a pivotable lever connected to the body, absorbs the forces introduced by impact and dissipates these, for example, into the body, in order thus to avoid damage. Following an impact, the breakdown protection is moved out of its protective position in order to allow pivoting of the rotary latch into its locking position and thus locking of the locking mechanism. The breakdown protection can be moved out of its protective position by an electric drive together with a mechanism.It is the object of the invention to further develop a closing device with a breakdown protection.The object is achieved by a closing device having the features of the first claim. Advantageous embodiments are evident from the dependent claims. Unless otherwise indicated below, the aforementioned features known from the prior art can be combined individually or in any combination with the subject matter according to the invention.The closing device according to the claim for a door or flap comprises a locking mechanism consisting of a rotary latch and at least one pawl for latching the rotary latch and a penetration protection in the form of a pivotably mounted blocking lever. A motor drive is provided by means of which the pivotably mounted blocking lever can be moved back and forth between its protective position and its non-protective position. In the protective position, the blocking lever acts as a penetration protection. The blocking lever can then intercept an impact caused by the closing of a door or flap in order to avoid damage. If the door or flap is thus closed excessively quickly, a corresponding movement of the locking bolt attached to the door or flap is finally stopped or blocked by the blocking lever, in order thus to avoid damage.The breakdown protection is at the given time moved out of its protective position by the motor drive when the door or flap is closed. The drive moves a cam on a circular path. The cam may protrude from a control disk which can be rotated by the motor drive. By means of a control contour, against which the cam abuts or into which the cam extends, the circular movement of the cam is converted into a basically linear movement of a transmission element. The transmission element extends as far as the blocking lever and is connected thereto in particular movably in such a way that the blocking lever can be pivoted from its protective position into its non-protective position and vice versa by the movement of the transmission element.The transmission element ensures that the motor drive, which is in particular an electric drive, can be located remote from the blocking lever. This makes it possible to select the position of the drive independently of location. In particular, it thus becomes possible to provide a drive not only for moving the blocking lever, but also additionally for a comfortable opening and / or closing of the door or flap. In the present case, the drive is additionally used for closing movements and opening movements of the door or flap. In the case of closing a door or flap, a door or flap is moved and / or pulled from an initial position into the end position in which the door or flap is completely closed. In the case of opening the door or flap, the door or flap is moved back from the end position into the starting position by the drive. If the flap is a hood, the motorized drive lowers the hood starting from the starting position and finally pulls the hood completely up to the end position. During opening, the drive vice versa lifts the hood. If the hood or a locking bolt of the hood is placed on the locking device, the starting position is reached.Using a cam which is moved on a circular path for moving the blocking lever has the advantage that in this way further movements are effected in that further cams or bolts are provided suitable for controlling and moving.The control contour is preferably an elongated hole into which the cam extends. This allows the blocking lever to be moved back and forth in a technically simple manner.The elongated hole preferably has a straight section and an arcuate section. The rectilinear portion can be used to move the blocking lever. The arcuate portion may be used to stop moving the blocking lever and still continue rotating movement to control and move other components.The transmission element is preferably movably connected to the blocking lever, so that a linear movement of the transmission element can be suitably converted into a rotational movement of the blocking lever in a technically simple manner.In one embodiment, a bolt of the transmission element reaches into an elongated hole of the blocking lever, in order to thus suitably create the aforementioned movable connection between transmission element and blocking lever.In one embodiment, the blocking lever blocks an ejector lever in its protective position. This causes the breakdown protection. The presence of an ejector lever facilitates opening of a hood. By pivoting the ejector lever, movements of the hood can be effected.In an advantageous embodiment, the motorized drive can raise, lower and / or pull a hood of a motor vehicle. The motorized drive, which is in particular an electric motor, takes over a plurality of functions, which advantageously keeps the number of components low and nevertheless makes possible great comfort.In an advantageous embodiment, the motorized drive can rotate a control disk, on which a plurality of cams or bolts are attached, by means of which the lifting, lowering and / or pulling of the hood is effected. In a technically simple manner, the possibility is thus comfortably available of opening or closing a hood.Advantageously, a lever is provided with which the blocking lever can be moved manually out of its protective position and / or vice versa. This contributes to the fact that, in the event of a power failure or another electrical fault, a hood can nevertheless be closed and / or opened in this way.The lever with which the blocking lever can be moved manually out of its protective position advantageously comprises an elongated hole into which a bolt or cam of the transmission element extends. The elongated hole allows the transmission element to be moved independently of the lever for manually moving the blocking lever. The lever for manually moving the blocking lever therefore does not have to be moved together with a regular opening and closing. Nevertheless, the pin or cam of the transmission element can be used to move the blocking lever manually in an electrical fault. The number of parts is thus kept small.The lever with which the blocking lever can be moved manually out of its protective position preferably has a support on which an ejector lever and / or the rotary latch and / or a locking bolt of a hood or flap can rest when the blocking lever has been moved manually out of its protective position. A hood or flap therefore cannot fall immediately. The risk of fingers and the like being jammed is thus reduced, since the hood must also be moved manually after the blocking lever has been moved out of its protective position.The lever with which the blocking lever can be moved manually out of its protective position is advantageously locked in the position in which the blocking lever has been moved manually out of its blocking position. This further reduces injury risks, among other things.A lever with which a blocking lever can be moved manually out of its protective and its non-protective position, which is provided with a support for securing a hood against immediate dropping following the moving out, constitutes an independent invention independently of the motor drive for moving the blocking lever in a closing device for a motor vehicle, and in particular also in combination with the possibility of latching in the extended position.In an advantageous embodiment of the invention, a gap between the door or flap and the adjoining vehicle body can be reduced and / or enlarged by the motorized or electrical drive in the closed state of a door or flap. In the closed state, the locking mechanism is locked and the locking bolt can no longer leave the locking mechanism. A rocker can then be pivoted by the motor drive. The locking mechanism is then moved completely or partially by means of the rocker in such a way that a door gap or flap gap can be reduced and enlarged. Starting from an end position in which a door gap or hood gap is minimized, a sealing pressure is reduced, for example, by increasing the gap caused by the motor drive. Subsequently, the locking mechanism can therefore then be unlocked with low forces, since no frictional forces which are associated with a sealing pressure have to be overcome. By pulling a door or flap toward the end position by motor, it is achieved in the opposite direction that a gap between the body and the door or flap can be minimized. A zero joint can thus be achieved between the body and the door or flap, so that a gap is no longer present or practically no longer present.By means of the motor drive, for example, a hood is raised, starting from a zero gap, by preferably 4 mm to 8 mm, particularly preferably 5 to 7 mm, for example approximately 6 mm. The opening force and opening noises can be reduced so much as compared with conventional hood closing devices because the lifted hood is no longer subjected to a sealing load.Subsequently, the locking mechanism is unlocked, which can be done purely mechanically as well as by an electric drive, and in both cases advantageously with a comparatively low force exertion, if the hood has been lifted previously. Subsequently, in a preferred embodiment, a preferably spring-loaded ejector lever lifts the hood, namely in such a way that a sufficiently large gap is formed for further manual lifting of the hood without problems. The gap thus formed is preferably at least 10 mm, particularly preferably at least 12 mm, for example about 15 mm. In addition, the motor drive finally moves the blocking lever into its protective position,In one embodiment, a hood with the closing device according to the claim is opened by pulling and releasing an inner support lever or opening lever twice as follows.In the first stroke, only one lever is reversed, which engages and thus brings the closing device from the locked state into the unlocked state. Opening is reliably prevented. The actuating force is far below the current usual force in the first stroke, since only unlocking takes place.In the first stroke, a switching signal is also generated, so that the motor drive lifts the lock or the hood at least 10 mm, preferably at least 12 mm, particularly preferably at least 15 mm. Only after the opening lever has been completely released does the clutch drop. This ensures that the lock can be opened only in the second stroke. In the second stroke, the closing device is opened via the engaged clutch, i.e. the locking mechanism is disengaged. The opening force and the opening noises can thus be significantly reduced during the second stroke, since the lifted hood is no longer seated in the lock in a prestressed manner. Moreover, the blocking lever is moved from its non-protective position into its protective position by the electric drive.Preferably, a hood is closed with a closing device according to the claim as follows:The hood is placed on the locking device so that, for example, the striker or the striker then rests on an arm of the rotary latch and / or on an ejector lever, wherein a gap of at least 10 mm, preferably of at least 12 mm, particularly preferably of at least 15 mm remains between the hood and the adjoining body.The motorized drive, which is usually an electric drive, moves the blocking lever out of its protective position. The hood is then lowered, for example, by the electric drive. The electric drive rotates a control disk, for example, and thereby lowers the ejector lever or a rocker and thus the hood. The hood thus lowers by electric motor after the hood has been placed on top, for example, at a height of about 15 mm, but can be raised again at any time, so that there is no risk of fingers being caught.If a predetermined gap dimension of preferably 4 mm to 8 mm is thus achieved between the hood and the adjoining vehicle body, the pawl locks the rotary latch. There is no risk of jamming because the gap is so small that no fingers can enter the gap.Subsequently, the hood is lowered further by the electric drive and can now also be pulled closed in a force-locking manner against a sealing pressure due to the locked state of the locking mechanism in order to further reduce the gap mentioned, in particular until a gap dimension of 0 to 2 mm is reached. This further reduction of the gap dimension takes place, for example, with the aid of the mentioned rocker.It is thus also achieved that the closing noises are low. Opening can be effected purely electrically without problems, and in particular when the control is sufficiently protected, for example, by an emergency current concept.A clutch can be coupled to the pawl in one embodiment such that the clutch is decoupled by latching the pawl, that is to say, for example, a lever provided for this purpose is lifted out of its coupling position. It is thus ensured that the clutch is in its decoupled position after the closure of the hood. Alternatively or additionally, the clutch can be designed such that, following a clutch engagement, it automatically disengages after a predetermined time period has elapsed. In order to open a hood, the inner operating lever in this embodiment must be operated twice within the predetermined period of time in order to be able to open the hood. This further prevents incorrect operation.With a sufficiently low closing speed of a door or flap, a breakdown protection is not required. Therefore, in one embodiment, at a sufficiently low closing speed, the latter is moved prematurely out of its protective position by the motor drive, namely in particular before the rotary latch or another component provided, which can be braked or blocked by the breakdown protection, can strike the breakdown protection, that is to say the blocking lever. The locking mechanism can thus be latched without delay without having to move the rotary latch subsequently out of its protective position after the catch has hit the penetration protector. The breakdown protection thus advantageously develops its protective effect in this embodiment only when a door or flap is closed at an excessively high speed, i.e. at a speed above a threshold value.If the breakdown protection is moved in one embodiment by the motor drive with a time delay from its protective position due to an excessively rapid closing of a door or flap, it is advantageously not necessary to first move the door or flap back or lift it somewhat in the opening direction again in order to be able to close a door or flap. In this embodiment, the breakdown protection develops a type of braking effect, i.e., it cannot permanently block or only temporarily stop the closing movement.In one embodiment, there is, in addition to the motor drive, a manually movable actuating lever, with which the blocking lever can be moved out of its protective position. This contributes to being able to close a door or flap even if the electric drive is damaged or no current is available.In one embodiment of the invention, the pivotable blocking lever is fastened to a plate which generally consists of metal. The panel may be part of the body or may be fastened to the body in order to dissipate impact forces into the body and to protect them from damage.In one embodiment of the invention, by excessively rapidly closing a door or flap, the rotary latch strikes the blocking lever directly if the blocking lever has not been moved out of its protective position. However, the impact can also be introduced first into an ejector lever, which then transfers the force into the blocking lever. The locking bolt can alternatively or additionally impact directly on the blocking lever, namely at least when the door or flap is closed at an excessively high speed.In a technically simple embodiment of the invention, the breakdown protection is moved into its protective position and / or held in its protective position in a purely mechanical manner, for example by a prestressed spring and / or by gravity. In order to move the breakdown protection out of its protective position, this must take place against the force of the prestressed spring and / or against the force of gravity.The invention relates in particular to flaps or hoods which can penetrate right beyond a main ratchet position. The possibility of penetration serves for passive safety in the event of a crash in order to protect persons improved in the event of an impact on the hood. If a person strikes the hood or flap, the rotary latch can be rotated further in such a way that the hood or flap yields and thus risks of injury are reduced. In particular, such hoods or flaps have the problem that, in the absence of penetration protection, damage to paint, body, headlights and add-on parts can occur in the event of excessively rapid closing of the hood or flap. In order to prevent this, such a hood is blocked or braked beforehand by the penetration protection, and in particular preferably at least 6 mm, before the hood or flap has reached its closed position. If no gap remains between the hood or flap in the closed state according to plan (so-called 0-joint), the penetration protection preferably brakes or blocks at least 12 mm before the hood or flap reaches the closed state. The hood or flap must then be lowered further by at least 6 mm or at least 12 mm in order to move from the braked or blocked position into its intentionally closed position or end position.After a blockage, in one embodiment, a spring-loaded ejector lever, for example, lifts the hood one piece. The blocking lever is thus relieved and the hood can subsequently be slowly closed, namely electromechanically, that is to say with the inclusion of the electric drive. The electric drive then advantageously also ensures that the hood is finally closed sufficiently slowly. The electric drive can serve to suitably lower an ejector lever at the given time, so that the flap is slowly closed. For this purpose, for example, the locking bolt or striker of the hood can rest on the ejector lever at the suitable point in time due to gravity.In one embodiment, the blocking lever can directly block or brake the ejector lever and thus indirectly the rotary latch. However, other components can also be directly blocked, such as a rotary latch, locking bolt or hood.The invention is explained in more detail below with reference to figures. The following are shown: FIG. 1 : closing device with blocking lever; FIG. 2 : Drive for moving the blocking lever in the blocking position; FIG. 3 : Drive for moving the blocking lever following the removal of the blocking lever from its blocking position; FIG. 4 : Continuation of the movement of the blocking lever from its blocking position; FIG. 5 : Further rotational movement of the drive without further movement of the blocking lever; FIG. 6 : Configuration of the manual drive with a support in the blocking position of the blocking lever; FIG. 7 : Resting of an ejector lever on a support following the manual moving out of the blocking lever from its blocking position; FIG. 8 : Manual lowering of an ejector lever; FIG. 9 : Locking of the lever for manual movement of the blocking lever.FIG. 1 shows a rotary latch 1 which can be pivoted about its axis 2. In the inlet slot of the rotary latch 1, a striker 3 of a hood of a motor vehicle is held. The rotary latch 1 is locked by a pawl 4 which can be pivoted about its axis 5. An actuating lever, not shown, in the interior of the motor vehicle is connected to a coupling 7 via a Bowden cable 6. The clutch 7 is coupled, as indicated, to a lever arm 8 of the pawl 4. If the actuating lever is actuated a first time, the clutch engages. At the same time, a microswitch 9 is thereby actuated. The microswitch 9 actuates an electric motor, not shown. The electric motor rotates a control disk 10 about its axis 11 for example in the clockwise direction. A bolt 12 emerges from the control disk, against which bolt one end of a lever arm 13 of an ejector lever 14 bears, biased from below, on account of a spring tension. The spring 15 is responsible for this purpose, which bears in a prestressed manner against the end of a further lever arm 16 of the ejector lever 14. The ejector lever 14 extends approximately linearly, namely substantially parallel to the inlet slot of the rotary latch 1 when the hood is closed.The control disk 10 has a further protruding bolt 18 which extends into the input-shaped end 19 of a rocker lever 20, also called rocker 20. The rocker 20 is rotatably supported by its axle 21, for example, on a plate held stationary. The axes 2, 5, 17 of the rotary latch 1, the pawl 4 and the ejector lever 14 are mounted on the rocker 20. This has the consequence that pivoting of the rocker 20 about its axis 21 likewise pivots these axes 2, 5, 17 and thus the locking mechanism comprising the rotary latch 1 and the pawl 4 and the ejector lever 14 overall. If, starting from the closed state of a hood and thus starting from the situation shown in FIG. 1, the control disk 10 is rotated, for example, counter-clockwise by the electric drive, which can be an electric motor, then the rocker 20 is pivoted about its axis 21 counter-clockwise. The locking mechanism consisting of the rotary latch 1 and the pawl 4 and the lever arm 13 of the ejector lever 14 are thereby raised. Since the striker 3 is located in the fork-shaped inlet slot of the rotary latch 1 and rests on a support 22 of the ejector lever 14, the hood is thus raised. A gap is formed or enlarged between the hood and the adjoining vehicle body, until, for example, the gap dimension is 4 to 8 mm, for example 6 mm. The hood is thus relieved of a sealing pressure. One or more microswitches 23, 24, 25 control the positions of the closing device, for example the positions of rotary latch 1 and / or control disc 10, and stop the electric drive as soon as the corresponding position of rotary latch 1 or control disc 10 and thus the desired gap dimension of, for example, 6 mm is reached. Since the bolt 18 for the rocker 20 is advantageously located close to the axis 11 in comparison to the bolt 12, the rocker 20 can be pivoted with a comparatively great force.If the inner actuating lever is now actuated a second time, the pawl 4 is thereby pivoted counter-clockwise about its axis 5. As a result, the latching arm 26 of the pawl 4 is lifted out of its latching position shown in FIG. 1, i.e. pivoted out. Since the rotary latch 1 can now be pivoted about its axis 2 in the counterclockwise direction, the ejector lever 14 can now move the bolt 12 further by the spring force of the spring 15 or, if required, the control disk 10 is rotated further accordingly by the electric motor for this purpose. If necessary, the bolt 18 can thereby be moved out of the fork-shaped end 19 and the rocker 20 can thus be released. The ejector lever 14 is thus pivoted by spring force in the counterclockwise direction about its axis 17, which results in a pivoting of the rotary latch 1 and a further lifting of the striker 3. The gap dimension mentioned is thus further increased to, for example, 15 mm.The closing is carried out correspondingly in the opposite manner. The striker 3 is thus moved into the inlet slot of the rotary latch 1 and finally rests on the support 22 of the ejector lever 14. If the control disk 10 is now rotated back, the lever arm 13 of the ejector lever 14 is thereby pivoted downward and the gap dimension of the hood, i.e. the flap gap, is thus reduced from 15 mm, for example, to 6 mm, for example. Subsequently, the rotary latch 1 is latched and a further rotation of the control disk 10 then reduces the gap dimension from 6 mm to, for example, 0 to 2 mm by pulling it by pivoting the rocker 20 clockwise about its axis 21.The lever arm 13 of the ejector lever 14 can comprise a joint 27. Such a joint 27 is supported against rotation in one direction by a driver 28 in such a way that the aforementioned effects or movements are achieved. Such a joint 27 advantageously makes it possible for the bolt 12 to be located in an elongated hole or in a cable-shaped end of the lever arm 13, in order to be able to interact with the ejector lever 14 in a particularly reliable manner.The closing device shown in FIG. 1 comprises a penetration protection means in the form of a pivotable blocking lever 29 which can be pivoted about its axis 30. During a closing, excessively high impact forces can be dissipated into the penetration protection 29 via the ejector lever 14 in order to avoid damage. Subsequently, the penetration guard 29 is pivoted or lifted out of its protective position, namely by rotating the control disk 10 by a mechanism not shown in FIG. 1. Thereafter, the hood can be fully closed. Conversely, by rotating the control disk 10 during an opening, the blocking lever 29 can then also be moved into its protective position.For safety reasons, the microswitch 9 is preferably capable of diagnosis in order to further improve the safety in the case of a hood.In principle, the control disk 10 can also be rotated clockwise in order to open the closing device. During such a rotational movement, it is achieved that the bolt 18 cannot leave the fork-shaped end 19 of the rocker. If it is not provided or not necessary for the bolt 18 to be moved out of the end 19 of the rocker, an elongated hole instead of a fork-shaped end 19 can be provided in order to thus particularly reliably couple the end 19 to the bolt 18.The following figures show a mechanism with which the blocking lever 29 can be moved back and forth between the protective and non-protective positions both mechanically and by the electric motor.FIG. 2 shows components of the closing device in the situation in which a hood has been placed on the closing device for closing. A bolt 31 is connected to the axle 11, for example by the bolt 31 protruding from the control disk 10. The bolt 31 extends into a partially or sectionally arcuate slot 32 which represents a control contour. The arcuate slot 32 is connected to a transmission element 33. The transmission element 33 extends as far as the blocking lever 29 and has a bolt 34 at this end. The bolt 34 extends into an elongated hole 35 of the blocking lever 29.There is a manually operable lever 36 which is pivotable about its axis 37. An arm extending from the shaft 37 is provided with an elongated hole 38. The bolt 34 likewise extends into or through this slot 38.FIG. 2 shows the case in which the blocking lever 29 is in its protective position. In the event of an impact of the striker on the ejector lever 14, the latter would be pivoted clockwise about its axis 17 and strike the blocking lever 29, which would then prevent further pivoting.Following such an impact or upon a closing at normal closing speed, the electric motor and thus the control disk 10 is started, namely in the clockwise direction in the case of FIG. 2. This has the result that the transmission element 33 is moved linearly and thus moves the blocking lever out of its protective position, as FIGS. 2 and 3 show. During the movement, the bolt 31 has moved along a linear section within the slot 32. The bolt 31 is now moved along the arcuate portion of the slot 32 by further rotation of the control disk 10. This ensures that the position of the blocking lever no longer changes. This further rotational movement is used to completely close the hood as explained with reference to FIG. 1.The elongated hole 38 is dimensioned and positioned such that the linear movement of the transmission element 33 does not result in the lever 36 being pivoted. However, manually pivoting the lever 36 counter-clockwise about the axis 37 would likewise result in the blocking lever 29 being pivoted out of its blocking or protecting position. Thus, a hood can be closed even if the electrical system fails.By means of the reverse rotation of the control disc 10, the blocking lever 29 can be correspondingly pivoted back into its protective position. This is likewise possible manually with the lever 36 by pivoting in the clockwise direction, namely starting from the position shown in FIG. 5.FIGS. 6 to 9 illustrate an embodiment of the lever 36 with which the blocking lever 29 can be moved manually out of its protective position and back. An extension is attached to the elongated hole 38 which can serve as a support 39 for the ejector lever 14. As FIG. 7 shows, the ejector lever 14 rests on the support 39 when the lever 36 has been extended by pivoting it clockwise about its axis 37. Thus, when the blocking lever 29 has been moved out of its blocking or protecting position, the hood of a motor vehicle does not immediately drop. In particular, the lever 36 is locked in this extended position.If the lever 36 is slowly pivoted back counter-clockwise about its axis 37, the ejector lever 14 is thereby slowly lowered, as FIG. 8 shows.FIG. 9 illustrates the latching of the lever 36, which is shown here in section. The lever 36 is flexible, so that it can be moved past a catch 40 shown in section, which initially runs in the shape of a ramp. After passing through the ramp-like region, the lever 36 can be moved into a step-like region, by means of which the lever 36 is latched and thus held in the extended position.For a disengaging, the lever 36 is bent to the left in the case of FIG. 9 in order to subsequently be moved back into the position not shown in broken lines.List of reference characters1 Ratchet 2 Axis for the ratchet 3 Striker, locking bolt 4 Pawl 5 Axis for the pawl 6 Bowden cable 7 Clutch 8 Lever arm of the pawl 9 Microswitch 10 Control disk 11 Axis for the control disk 12 Bolt or cam 13 Lever arm of ejector lever 14 Ejector lever 15 Spring for the ejector lever 16 Lever arm of the ejector lever 17 Axis for the ejector lever 18 Bolt or cam 19 protruding from the control disk Fork-shaped end of a rocker 20 Rocker, Rocker arm 21 Axis for rocker 22 Support of the ejector lever for the striker 23 Microswitch 24 Microswitch 25 Microswitch 26 Latching arm of the pawl 27 Pivot joint of the ejector lever 28 Driver 29 Penetration protection 30 Axis for penetration protection 31 Bolt or cam for transmission element 32 Slot of a transmission element 33 Transmission element 34 Bolt or cam at the free end of the transmission element 35 Slot of the blocking lever 36 Lever for manually moving the blocking lever 37 Axis of the lever for manually moving the blocking lever 38 Slot of the lever for manually moving the blocking lever 39 Support for ejector lever 40 Latch

Claims

Locking device for a door or flap of a motor vehicle, comprising a locking mechanism consisting of a rotary latch (1) and at least one pawl (4) for latching the rotary latch and a breakdown protection in the form of a pivotably mounted blocking lever (29) with a motor drive, by means of which the pivotably mounted blocking lever (29) can be moved back and forth between its protective position and its non-protective position, wherein the drive moves a cam (31) on a circular path, characterized in that the cam (31) bears against a control contour (32) of a transmission element (33), and by means of the control contour (32) and the transmission element (33) connected thereto a rotational movement of the cam (31) brings about a rotational movement of the blocking lever (29).Locking device according to claim 1, characterised in that the control contour is an elongated hole (32) into which the cam (31) extends.Locking device according to the preceding claim, characterized in that the slot (32) comprises a rectilinear portion and an arcuate portion.Locking device according to the preceding claim, characterized in that a rotational movement of the cam (31) does not cause a movement of the blocking lever (29) when the cam (31) is moved along the arc-shaped section of the slot (32).Locking device according to one of the preceding claims, characterized in that the transmission element (33) is movably connected to the blocking lever (29).Locking device according to the preceding claim, characterized in that a bolt (34) of the transmission element (33) extends into an elongate hole (35) of the blocking lever (29).Closing device according to one of the preceding claims, characterized in that the blocking lever (29), in its protective position, blocks an ejector lever (14).Closing device according to one of the preceding claims, characterized in that the motorized drive can raise, lower and / or pull a hood.Closing device according to the preceding claim, characterized in that the motorized drive is able to rotate a control disc (10), on which a plurality of cams or bolts (12, 18) are mounted, by means of which the raising, lowering and / or pulling of the hood is effected.Locking device according to one of the preceding claims, characterized in that a lever (36) is provided, with which the blocking lever (29) can be moved manually out of its protective position.Locking device according to the preceding claim, characterized in that the lever (36), with which the blocking lever (29) can be moved manually out of its protective position, comprises an elongated hole (38), into which a bolt or cam (34) of the transmission element (33) extends.Locking device according to one of the two preceding claims, characterized in that the lever (36) with which the blocking lever (29) can be moved manually out of its protective position has a support (39) on which an ejector lever (14) and / or the rotary latch (1) and / or a locking bolt of a hood or flap can rest when the blocking lever (29) has been moved manually out of its protective position.Locking device according to one of the two preceding claims, characterized in that the lever (36), with which the blocking lever (29) can be moved manually out of its protective position, can be latched in the position in which the blocking lever (29) has been moved manually out of its blocking position.

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