DE102014115239A1 - Closing device for a motor vehicle hood - Google Patents

Abstract

A locking device for a door or flap of a motor vehicle comprises a catch of the catch and at least one pawl for locking the catch and a punch-through protection in the form of a pivotally mounted blocking lever. There is a motor drive through which the pivotally mounted blocking lever between its protective position and its non-protective position can be moved back and forth. In the protective position, the blocking lever can intercept an impact caused by closing a door or flap to prevent damage. The break-through guard will in due course be 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 can protrude from a control disk, which can be rotated by the motor drive. By a control contour on which the cam is applied or in which the cam extends, the circular movement of the cam is converted into a linear movement of a transmission element. The transmission element extends to the blocking lever and is movably connected to it so that the blocking lever can be pivoted from its protective position to its non-protective position by the linear movement of the transmission element and vice versa.

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 ratchet comprises a catch and at least one pawl for locking the catch. The locking device includes a punch-through protection to prevent mechanical damage.

A lock of a locking device of the type mentioned is used for temporary closure of openings in motor vehicles by means of doors or flaps. In the closed state of such a lock, the rotary latch engages with two arms around a particular bow-shaped locking bolt around. Reached the catch of such a lock, starting from an open position by pivoting a closed position, the catch is finally locked by means of the pawl. Such pivoting is achieved by the locking bolt (also called "lock retainer" or "striker") when it is engaged by closing an associated door or flap in the catch.

If a door or flap is closed at great speed, the locking pin impacts the catch with great force. Damage due to such an impact can be avoided by a puncture protection. A puncture protection, which may be, for example, connected to the body, pivoting lever, absorbs the forces introduced by impact and derives this, for example, in the body, so as to avoid damage. Subsequent to an impact, the breakdown protection is moved out of its protective position in order to enable a pivoting of the rotary latch into its latching position and thus a 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 an object of the invention to further develop a locking device with a breakdown protection.

The object is achieved by a locking device having the features of the first claim. Advantageous embodiments emerge from the subclaims. Unless otherwise stated below, the aforementioned known from the prior art features can be combined individually or in any combination with the subject invention.

The claimed closing device for a door or flap comprises a catch of the catch and at least one pawl for locking the catch and a punch-through protection in the form of a pivotally mounted blocking lever. There is a motor drive through which the pivotally mounted blocking lever between its protective position and its non-protective position can be moved back and forth. In the protective position, the blocking lever acts as a punch-through protection. The blocking lever can then intercept an impact caused by closing a door or flap to prevent damage. Thus, if the door or flap is closed excessively fast, a corresponding movement of the latch bolt attached to the door or flap will eventually be stopped or blocked by the blocking lever so as to avoid damage.

The break-through guard will in due course be 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 can protrude from a control disk, which can be rotated by the motor drive. By a control contour on which the cam rests or in 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 to the blocking lever and is in particular so movably connected to it that can be pivoted by the movement of the transmission element of the blocking lever from its protective position to its non-protective position and vice versa.

By the transmission element is achieved that the motor drive, which is in particular an electric drive, can be located away from the blocking lever. This makes it possible to select the position of the drive location-independent. In particular, it is possible to provide a drive not only for moving the blocking lever, but also for a comfortable opening and / or closing the door or flap. In the present case, the drive is also 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 to 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 by the drive from the end position to the starting position. If the flap is a hood, the motor drive lowers the hood starting from the starting position and finally pulls the hood completely up to the end position. During opening, the drive reversely lifts the hood. Will the hood or a Locking bolt of the hood placed on the locking device, the initial position is reached.

Using a cam, which is moved in a circular path, for moving the blocking lever, has the advantage that in this way further movements are effected, in which further cams or bolts are provided suitable for controlling and moving.

The control contour is preferably a slot into which the cam extends. As a result, the reciprocation of the locking lever can be effected in a technically simple manner.

The slot preferably has a rectilinear portion and an arcuate portion. The straight-line section can be used to move the blocking lever. The arcuate portion may be used to stop the blocking lever from moving and still allow rotational movement to continue to control and move other components.

The transmission element is preferably movably connected to the blocking lever, so as to be able to convert a linear movement of the transmission element suitably and in a technically simple manner into a rotational movement of the blocking lever.

A bolt of the transmission element is sufficient in one embodiment in a slot in the blocking lever, so as to provide in a suitable manner, the aforementioned movable connection between the transmission element and the blocking lever.

The blocking lever blocked in one embodiment in its protective position an ejector. As a result, the breakdown protection is effected. The presence of an ejector lever facilitates the opening of a hood. By pivoting the ejector lever movements of the hood can be effected.

The motor drive can raise, lower and / or pull in a preferred embodiment, a hood of a motor vehicle. The motor drive, which is in particular an electric motor, performs a variety of functions, which advantageously keeps the number of components low while still allowing great comfort.

The motor drive can turn in an advantageous embodiment, a control disk on which a plurality of cams or bolts are mounted, via which the lifting, lowering and / or closing of the hood is effected. In a technically simple way is so comfortable the opportunity to open a hood or close.

Advantageously, a lever is provided with which the blocking lever can be manually moved out of its protective position and / or vice versa. This helps to ensure that a hood can still be closed and / or opened in the event of a power failure or other electrical failure.

The lever with which the blocking lever can be manually moved out of its protective position advantageously comprises a slot into which a bolt or cam of the transmission element extends. The slot allows the transmission member to be moved independently of the lever for manually moving the blocking lever. The lever for a manual movement of the locking lever must therefore not be moved with a regular opening and closing. Nevertheless, the pin or cam of the transmission element can be used to manually move the locking lever in an electrical accident. The number of parts is kept so low.

The lever with which the locking lever can be manually moved out of its protective position, preferably has a support on which an ejector lever and / or the catch and / or a locking bolt of a hood or flap can rest when the locking lever manually from his protective position has been moved out. A hood or flap can not fall immediately. The risk of pinched fingers and the like is reduced because the hood must be moved manually from its protective position even after a move out of the locking lever.

The lever with which the blocking lever can be manually moved out of its protective position is advantageously latched in the position in which the blocking lever has been manually moved out of its blocking position. This will u. a. Risk of injury further reduced.

A lever with which a blocking lever can be moved manually out of its protective and non-protective position, which is provided with a support to secure a hood from falling off immediately after being moved out, constitutes an independent invention independently of this motor drive for moving the locking lever in a locking device for a motor vehicle and in particular in combination with the possibility of locking in the raised position.

In an advantageous embodiment of the invention can be reduced with the motor or electric drive in the closed state of a door or flap, a gap between the door or flap and the adjacent body and / or enlarged. When closed, the locking mechanism is locked and the locking bolt can not leave the locking mechanism. It can be pivoted by the motor drive then a rocker. The locking mechanism is then wholly or partially moved by means of the rocker so 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, for example, a sealing pressure is reduced by a gap enlargement caused by the motor drive. Following this, therefore, the locking mechanism can then be unlocked with little force, since no frictional forces are to be overcome, which are associated with a sealing pressure. By the motor pulling a door or flap in the end position is achieved conversely that a gap between the body and the door or flap can be minimized. It can be achieved as a zero joint between the body and door or flap, so that a gap is not or practically no longer exists.

By means of the motor drive, for example, a hood is raised starting from a zero joint by preferably 4 mm to 8 mm, particularly preferably 5 to 7 mm, for example approximately 6 mm. The opening force and the opening noise can be significantly reduced in comparison to conventional hood closures, since the raised hood is no longer exposed to any sealing load.

Following this, the locking mechanism is unlatched, which can be done both purely mechanically and by an electric drive and in both cases advantageously with a relatively small force when previously the hood has been raised. Following this, in a preferred embodiment, a preferably spring-loaded ejector lever lifts the hood in such a way that a sufficiently large gap for easy further manual lifting of the hood arises. The resulting gap is preferably at least 10 mm, more preferably least 12 mm, such as about 15mm. In addition, the locking lever is finally moved by the motor drive in its protective position,

In one embodiment, a hood with the claimed closing device is opened by pulling and releasing a Innenbetägungshebels or opening lever twice as follows.

In the first stroke only a lever is folded, which engages, bringing the locking device from the locked to the unlocked state. Opening is reliably prevented. The actuation force is far below today's usual force in the first stroke, since only unlocked.

In the first stroke, a switching signal is generated, so that the motor drive the lock or the hood at least 10 mm, preferably at least 12 mm, particularly preferably at least 15mm raises. Only after a complete release of the opening lever is the clutch engaged. This ensures that only in the second stroke the lock can be opened. In the second stroke, the closing device is opened via the sunken clutch, thus unlocking the locking mechanism. The opening force and the opening noise can be significantly reduced at the second stroke, since the raised hood no longer biased sitting in the lock. In addition, the blocking lever is moved from its non-protective position to its protective position by the electric drive.

Preferably, a hood is closed with a claimed closing device as follows:
The hood is placed on the locking device so that, for example, the lock holder or the locking bolt then rests on an arm of the rotary latch and / or on an ejector lever, with a gap of at least 10 mm, preferably of at least 12 mm, more preferably of at least 15 mm between hood and adjacent body remains.

The motor 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, for example, a control disc and thereby lowers the ejector or a rocker and so the hood. The hood therefore lowers electromotive, after the hood has been placed, for example, in about 15mm height, but can be raised again at any time, so there is no risk of entrapment for fingers.

If such a predetermined gap between the hood and adjacent body of preferably 4 mm to 8 mm is reached, the pawl locks the catch. There is no danger of pinching, because the gap is so small that no fingers can get into the gap.

Following this, the hood is further lowered by the electric drive and can now due to the latched state of the Locks are also drawn positively against a sealing pressure to further reduce the said gap and in particular until reaching a gap of 0 to 2 mm. This further reduction of the gap dimension takes place, for example, with the aid of the aforementioned rocker.

It is also achieved so that the locking noise is low. Opening can be done without any problems purely electrically, especially if the control is sufficiently secured, for example by an emergency power concept.

A clutch can be coupled to the pawl in one embodiment, that by disengaging the pawl, the clutch is decoupled, so for example, a designated lever is lifted from its coupling position. It is thus ensured that the clutch is in its disengaged position after closing the hood. As an alternative or in addition, the coupling can be designed so that it disengages automatically after a predetermined period of time following engagement. In order to open a hood, the internal operating lever in this embodiment must be operated twice within the predetermined period of time to open the hood can. This counteracts further improved misoperation.

At a sufficiently low closing speed of a door or flap a punch-through protection is not required. Therefore, it is in an embodiment at sufficiently low closing speed early moved from its protective position by the motor drive out, and in particular before the catch or other intended component, which can be slowed down or blocked by the breakdown protection, on the breakdown protection, ie on the Blocking lever, can hit. The locking mechanism can be latched without delay, without having to subsequently move this out of its protective position after an impact of the catch on the breakdown protection. The punch-through protection unfolds its protective effect so advantageous in this embodiment only when a door or flap is closed at an excessively high speed, ie at a speed above a threshold.

If the puncture protection is delayed in one embodiment by an excessively fast closing of a door or flap from its protective position by the motor drive out, so it is advantageously not necessary to move the door or flap initially something in the opening direction or raise to close a door or flap. The breakdown protection unfolds in this embodiment, a kind of braking action, so can not permanently block or stop the closing movement only temporarily.

In one embodiment, in addition to the motor drive, there is a manually movable adjusting lever with which the blocking lever can be moved out of its protective position. This helps to close a door or flap even if the electric drive is damaged or no power is available.

In one embodiment of the invention, the pivotable locking lever is attached to a usually made of metal plate. The plate may be part of the body or be attached to the body, so as to dissipate impact forces in the body and protect it from damage.

In one embodiment of the invention, by an excessively fast closing of a door or flap, the catch bounces directly on the blocking lever, if it has not been moved out of its protective position. But the impact can also be first introduced into an ejector lever, which then forwards the force in the blocking lever. The locking bolt may alternatively or additionally impinge directly on the blocking lever, at least when the door or flap is closed at excessively high speed.

In a technically simple embodiment of the invention, the breakdown protection is moved in a purely mechanical manner, for example by a prestressed spring and / or by gravity, into its protective position and / or held in its protective position. In order to move the puncture protection out of its protective position, this must be done against the force of the prestressed spring and / or against gravity.

In particular, the invention relates to flaps or hoods that can penetrate beyond a main rest position. The possibility of breakthrough serves to provide passive safety in the event of a crash to protect persons in case of an impact on the hood. If a person strikes the hood or flap, the rotary latch can be turned on in such a way that the hood or flap yields and thus the risk of injury is reduced. In particular, in such hoods or flaps is the problem that damage to the paint, body, headlights and attachments may occur in the case of an excessively fast closing of the hood or flap in the absence of puncture protection. To prevent this, such a hood is previously blocked by the breakdown protection or braked and preferably preferred at least 6 mm before the hood or flap has reached its closed position. If no gap (so-called 0-gap) remains between the hood or flap in the planned closed state, the penetration protection preferably brakes or blocks at least 12 mm before reaching the closed state of the hood or flap. The hood or flap must then be at least 6 mm or at least 12 mm further lowered to get from the braked or blocked position in their planned closed position or end position.

After a blockage raises in one embodiment, for example, a spring-loaded ejector lever the hood a piece. The blocking lever is thus relieved and the hood can then be closed slowly and that electromechanical, ie including the electric drive. By the electric drive is then advantageously ensured that the hood is finally closed sufficiently slowly. The electric drive can serve to suitably lower an ejector lever at the appropriate time, so as to close the flap slowly. For this purpose, for example, the locking pin or striker of the hood at the appropriate time on the ejector lever rest due to gravity.

In one embodiment, the blocking lever can directly block or decelerate the ejector lever and thus indirectly lock the catch. But it can also be blocked directly other components such as rotary latch, locking pin or hood.

The invention will be explained in more detail with reference to figures. Show it:

1 : Locking device with locking lever;

2 : Drive for moving the locking lever in the blocking position;

3 : Drive for moving the blocking lever following removal of the blocking lever from its blocking position;

4 : Continuing to move the locking lever out of its blocking position;

5 : Further rotation of the drive without further movement of the locking lever;

6 : Design of the manual drive with a support in the blocking position of the blocking lever;

7 : Resting an ejector lever on a support following manual movement of the blocking lever out of its blocking position;

8th : Manually lowering an ejector lever;

9 : Locking the lever for a manual movement of the locking lever.

The 1 shows a catch 1 around her axis 2 can be pivoted. In the inlet slot of the rotary latch 1 becomes a lock holder or locking pin 3 held a hood of a motor vehicle. The catch 1 is by a pawl 4 latched to their axis 5 can be pivoted. An unillustrated operating lever in the interior of the motor vehicle is via a Bowden cable 6 with a clutch 7 connected. The coupling 7 is as indicated with a lever arm 8th the pawl 4 coupled. When the operating lever is actuated for the first time, the clutch engages. At the same time this is a micro-switch 9 actuated. The microswitch 9 sets an unillustrated electric motor in motion. The electric motor turns a control disc 10 around its axis 11 for example, clockwise. From the control disk creates a bolt 12 from where one end of a lever arm 13 an ejector lever 14 biased by a spring tension from below applied. Responsible for this is a spring 15 , which is preloaded at the end of another lever arm 16 the ejector lever 14 is applied. The ejector lever 14 extends approximately rectilinearly and that is substantially parallel to the inlet slot of the rotary latch 1 when the hood is closed.

The control disc 10 has another protruding bolt 18 which is in input-shaped end 19 a swing lever 20 , also swingarm 20 called, extends into. The swingarm 20 gets through its axis 21 rotatably supported, for example, on a stationary held plate. At the swingarm 20 are the axes 2 . 5 . 17 from the catch 1 , Pawl 4 and ejector lever 14 appropriate. This has the consequence that a pivoting of the rocker 20 around its axis 21 these axes 2 . 5 . 17 and thus the locking mechanism comprising the catch 1 and the pawl 4 and the ejector lever 14 also pivoted overall. Will be the control disc 10 starting from the closed state of a hood and thus starting from in the 1 shown situation, for example, counterclockwise by the electric drive, which may be an electric motor, twisted, then the rocker 20 around its axis 21 pivoted counterclockwise. The locking mechanism consisting of a catch 1 and pawl 4 as well as the lever arm 13 the ejector lever 14 are raised by it. As the lock holder 3 in the fork-shaped inlet slot of the rotary latch 1 is located and on a pad 22 the ejector lever 14 flies up, so that the hood is raised. It creates or enlarges a gap between the hood and adjacent body until, for example, the gap 4 to 8 mm, for example, 6 mm. The hood is thus relieved of a sealing pressure. One or more microswitches 23 . 24 . 24 Control the positions of the locking device, such as 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 disk 10 and thus the desired gap of, for example, 6 mm is reached. Because the bolt 18 for the swingarm 20 advantageously close to the axis 11 compared to the bolt 12 The swingarm can be located 20 be pivoted with comparatively large force.

Now, if the internal operating lever is actuated a second time, so is the pawl 4 counterclockwise about its axis 5 pivoted. As a result, the locking arm 2 6 of the pawl 4 from his in the 1 dug out shown locking position, so pivoted out. Now the catch 1 around its axis 2 can be pivoted counterclockwise, now the ejector lever 14 by spring force of the spring 15 the bolt 12 move it further or it will if necessary for the control disc 10 accordingly further rotated by the electric motor. If necessary, the bolt can 18 thereby from the forked end 19 moved out and so the swingarm 20 be released. The ejector lever 14 is thus counteracted by spring force to the clockwise direction about its axis 17 pivoted, causing a pivoting of the catch 1 and another lifting of the lock holder 3 entails. The said gap is further increased to, for example, 15 mm.

Closing is correspondingly reversed. The lock holder 3 So it is in the inlet slot of the catch 1 moved in and finally lies on the support 22 the ejector lever 14 on. Will now the control disc 10 turned back, so this is the lever arm 13 the ejector lever 14 pivoted down and so the gap of the hood, so the flap gap of, for example 15 mm reduced to, for example, 6 mm. After that, the catch will turn 1 locked and another turn of the control disc 10 then reduces the gap of 6 mm to, for example, 0 to 2 mm by pulling by pivoting the rocker 20 clockwise about its axis 21 around.

The lever arm 13 the ejector lever 14 can be a joint 27 include. Such a joint 27 is so against a twist in one direction by a driver 28 supported that the above effects or movements are achieved. Such a joint 27 makes it possible advantageously that the bolt 12 in a slot or in a cable-shaped end of the lever arm 13 can be so very reliable with the ejector lever 14 to be able to work together.

The in the 1 Locking device shown comprises a punch-through protection, in the form of a pivotable locking lever 29 that's about its axis 30 can be pivoted. During a closing can be done via the ejector lever 14 excessively high impact forces in the breakdown protection 29 be derived to avoid damage. Subsequently, the breakdown protection 29 pivoted out of its protective position or excavated by rotating the control disc 10 by a in the 1 not shown mechanics. Then the hood can be completely closed. Conversely, then by turning the control disk 10 while opening the blocking levers 29 be moved to its protective position.

For safety reasons, the microswitch is 9 preferably diagnosable, to further increase the safety in the case of a hood further improved.

Basically, the control disk 10 also be rotated in a clockwise direction to open the closing device. In such a rotational movement is achieved that the bolt 18 the forked end 19 the swingarm can not leave. Is not provided or required that the bolt 18 from the end 19 the swing arm is moved out, so can a slot instead of a forked end 19 be provided so as to be particularly reliable the end 19 with the bolt 18 to pair.

In the following figures, a mechanism is shown with the blocking lever 29 Both mechanically and by the electric motor between protective and non-protective position can be moved back and forth.

The 2 shows components of the locking device in the situation in which a hood has been placed on the locking device for closing. With the axle 11 is a bolt 31 connected, for example by the bolt 31 from the control disk 10 is off. The bolt 31 extends into a partially or sectionally arcuate slot 32 in which represents a control contour. The arched slot 32 is with a transmission element 33 connected. The transmission element 33 extends to the blocking lever 29 and has a bolt at this end 34 on. The bolt 34 reaches into a slot 35 of the locking lever 29 into it.

There is a manually operated lever 36 that's about its axis 37 can be pivoted. One from the axle 37 outgoing arm is with a slot 38 Mistake. In this slot 38 the bolt is enough 34 also into or through.

The 2 shows the case that the locking lever 29 in its protective position. In case of impact of the lock holder on the ejector lever 14 this would turn clockwise around its axis 17 pivoted and on the blocking lever 29 hit, which would then prevent further pivoting.

Following such an impact or at a close with normal closing speed of the electric motor and thus the control disk 10 set in motion in the case of 2 clockwise. This causes the transmission element 33 is moved linearly and thus moves the blocking lever out of its protective position, like the 2 and 3 clarify. Within the movement the bolt has 31 along a linear section inside the slot 32 emotional. The bolt 31 Now, by further turning the control disc 10 along the arcuate portion of the slot 32 emotional. This ensures that the position of the locking lever does not change. This further rotational movement is used to the hood as based on the 1 fully explained.

The slot 38 is dimensioned and positioned so that the linear movement of the transmission element 33 does not mean that the lever 36 is pivoted. A manual pivoting of the lever 36 counterclockwise about the axis 37 around, however, would have the same result that the locking lever 29 is pivoted out of its blocking or protective position. So closing a hood is also possible when the electrical system fails.

By reversing the control disc 10 can the locking lever 29 be swung back accordingly in its protective position. This is equally manual with the lever 36 by pivoting clockwise possible and starting from the in the 5 shown position.

The 6 to 9 illustrate an embodiment of the lever 36 with which the locking lever 29 can be manually moved out of its protective position and back. At the slot 38 An extension is attached as an edition 39 for the ejector lever 14 can serve. As the 7 clarifies, lies the ejector lever 14 on the pad 39 on when the lever 36 has been issued by this clockwise about its axis 37 has been pivoted. Is the blocking lever 29 so moved out of its blocking or protective position, the hood of a motor vehicle does not fall to immediately. In particular, the lever 36 latched in this issued position.

Will the lever 36 slowly counterclockwise around its axis 37 swung back, so this is the ejector 14 slowly lowered, like that 8th clarified.

The 9 illustrates the locking of the lever 36 which is shown here in section. The lever 36 is flexible, so this on a catch shown in section 40 can be moved past, which initially runs ramped. After passing through the ramp-like area, the lever 36 be moved into a step-shaped area, through which the lever 36 locked in the raised position and held so.

For unlocking the lever 36 in the case of 9 bent to the left to then be moved back to the unillustrated position shown in dashed lines.

LIST OF REFERENCE NUMBERS

1

 catch

2

 Axle for the catch

3

 Lock holder, locking pin

4

 pawl

5

 Axle for the pawl

6

 Bowden

7

 clutch

8th

 Lever arm of the pawl

9

 microswitch

10

 control disc

11

 Axle for the control disc

12

 protruding from the control disc bolts or cams

13

 Lever arm of ejector lever

14

 ejector

15

 Spring for the ejector lever

16

 Lever arm of the ejector lever

17

 Axle for the ejector lever

18

 protruding from the control disc bolts or cams

19

 forked end of a swingarm

20

 Rocker, rocker arm

21

 Axle for the swingarm

22

 Edition of the ejector lever for the lock holder

23

 microswitch

24

 microswitch

25

 microswitch

26

 Locking arm of the pawl

27

 Swivel joint of the ejector lever

28

 takeaway

29

 Punch protection

30

 Axis for punch-through protection

31

 Pin or cam for transmission element

32

 Slot of a transmission element

33

 transmission element

34

 Pin or cam at the free end of the transmission element

35

 Slot of the locking lever

36

 Lever for manually moving the locking lever

37

 Axle of the lever for manual movement of the locking lever

38

 Slot of the lever for a manual movement of the locking lever

39

 Support for ejector lever

40

 notch

Claims (13)

Locking device for a door or flap of a motor vehicle comprising a catch of a catch ( 1 ) and at least one pawl ( 4 ) for a locking of the catch and a punch-through protection in the form of a pivotally mounted blocking lever ( 29 ) with a motor drive, through which the pivotally mounted blocking lever ( 29 ) between its protective position and its non-protective position can be moved back and forth, wherein the drive is a cam ( 31 ) is moved on a circular path, characterized in that the cam ( 31 ) on a control contour ( 32 ) of a transmission element ( 33 ), and by the control contour ( 32 ) and the transmission element ( 33 ) a rotary movement of the cam ( 31 ) a pivoting movement of the blocking lever ( 29 ) causes. Locking device according to claim 1, characterized in that the control contour is a slot ( 32 ) into which the cam ( 31 ). 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 ) causes no movement of the blocking lever when the cam along the arcuate portion of the slot ( 32 ) is moved. Locking device according to one of the preceding claims, characterized in that the transmission element ( 33 ) movable with the blocking lever ( 29 ) connected is. Locking device according to the preceding claim, characterized in that a bolt ( 34 ) of the transmission element ( 33 ) in a slot ( 35 ) of the blocking lever ( 29 ). Locking device according to one of the preceding claims, characterized in that the blocking lever ( 29 ) in its protective position an ejector lever ( 14 ) blocked. Locking device according to one of the preceding claims, characterized in that the motor drive can lift, lower and / or pull a hood. Locking device according to the preceding claim, characterized in that the motor drive is a control disk ( 10 ) is rotatable at which a plurality of cams or bolts ( 12 . 18 ) are attached, via which the lifting, lowering and / or closing of the hood is effected. Locking device according to one of the preceding claims, characterized in that a lever ( 36 ) is present, with which the blocking lever ( 29 ) can be manually moved 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 manually moved out of its protective position, a slot ( 38 ) into which a bolt or cam ( 34 ) of the transmission element ( 33 ). Locking device according to one of the two preceding claims, characterized in that the lever ( 36 ), with which the blocking lever ( 29 ) can be manually moved out of its protective position, an edition ( 39 ), on which an ejector lever ( 14 ) and / or the catch ( 1 ) and / or a locking bolt of a hood or flap can rest when the locking lever has been manually moved 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 manually moved out of its protective position, can be locked in the position in which the blocking lever has been manually moved out of its blocking position.

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