EP1717392B1 - Additional lock arrangement for vehicle sliding door - Google Patents

Description

The present invention relates to a sliding door for a motor vehicle according to the preamble of claim 1 and to a lock arrangement for the sliding door of a motor vehicle according to the preamble of claim 19.
In the present case, all components which are necessary for the functionality of a sliding door are combined under the term "sliding door". These include, in addition to the displaceable component, the corresponding frame provided in the motor vehicle body, possibly existing guide rails, etc. In the following, the term "sliding door" is used interchangeably with the term "displaceable component" where it is used for easy readability.
Sliding doors have long been used for vans and vans, and more recently for passenger cars. All sliding doors have in common that they are adjustable by a sliding movement in an open and in a closed position. This sliding movement takes place substantially parallel to the side wall of the motor vehicle. Particularly advantageous is the fact that an undisturbed loading and unloading or getting in and out is possible.

Numerous variants are known for the structural implementation of the movement kinematics of a sliding door. This includes, for example, the principle of the rail guide, which is possibly supplemented by a lever arrangement. In the present case, it does not depend on the specific structural realization of the motion kinematics. Rather, the solution according to the invention is applicable to all conceivable constructions. It also does not matter in the present case, where the sliding door is arranged on the motor vehicle, so that both laterally and rearwardly arranged on the motor vehicle sliding doors are included.

In particular, in the use of sliding doors for cars wins ensuring a secure fixation of the sliding door in the closed position increasingly important. An unintentional opening of the sliding door, for example by a force acting from the inside perpendicular to the sliding door force here leads to significant dangers to the occupants of the motor vehicle.

At the same time, the requirements for ease of use are steadily increasing. This includes, for example, the function of fixing the sliding door in the open position, so that the sliding door does not automatically close during loading and unloading or when entering and exiting. This function is especially necessary when the motor vehicle is so on a slope that pushes the weight of the sliding door in the closing direction.

From the US 6 135 513 A (D2) has become known a sliding door for a motor vehicle, in which in addition to the lock arrangements, a so-called full-open holder is provided. The Full-Open Holder is used exclusively for fixing the sliding door in the open position.

From the US 3,198,564 A (D3), a sliding door for a motor vehicle has become known in which one and the same lock latch of the main lock arrangement is provided for fixing the sliding door on the one hand in the closed position and on the other hand in the open position.

From the US 2004/194385 A1 (D4), there has been known a sliding door for a motor vehicle in which a foreign matter detection unit is provided in the opening portion of the sliding door and a holding device for holding the sliding door upon detection of a foreign matter in the opening portion.

One approach to ensure the secure fixing of the sliding door in the closed position shows the known sliding door ( US 4,662,109 A ), from which the present invention proceeds. This is a rail-guided sliding door, which has a main lock assembly on the rear side seen in the direction of travel of the sliding door and an additional lock arrangement on the seen in the direction of travel front side of the sliding door. The additional lock assembly supports the main lock assembly in the fixation the sliding door in the closed position. This is particularly advantageous in a force acting from the inside outwards perpendicular to the sliding door force, since this force is now taken over three points of force application, namely the main lock assembly, the rail guide and the auxiliary lock assembly. Furthermore, the additional lock arrangement counteracts an adjustment of the sliding door in the opening direction, ie substantially along the direction of travel. In one embodiment, it is such that the main lock assembly has the usual closure elements latch and pawl, while the additional lock assembly is realized by a simple hook. In normal operation, the main lock assembly takes up most of the holding force required to fix the sliding door in the closed position. A disadvantage of the known sliding door is the fact that the ease of use is comparatively low. This is, inter alia, that a fixation of the sliding door in the open position is not provided.

Another well-known sliding door ( DE 2 347 702 A1 ) has, in addition to a main lock assembly on a fixing arrangement by which the sliding door can be fixed in the open position. The fixing arrangement is arranged with a pivotable pin which is arranged on the displaceable part of the sliding door and which, when the sliding door is moved into the open position, engages in a hook-shaped formation and thus prevents a return movement of the sliding door. A disadvantage of this sliding door with fixing the low security against accidental opening of the sliding door out of the closed position.

Similarly, a known sliding door ( GB 2 210 339 A ), which has a main lock assembly for fixing the sliding door in the closed position and a fixing arrangement for fixing the sliding door in the open position. Again, the security of the fixation of the sliding door in the closed position against unwanted opening is low. In one embodiment, the main lock assembly simultaneously assumes the function of the fixing, whereby the design effort is reduced. However, this does not lead to an optimal solution with regard to the structural design of the components involved, since the holding forces are considerably lower when the sliding door is in the open position than in the sliding door located in the closed position.

A corresponding combination of the above two functions, namely the fixing of the sliding door in the closed position and the fixing of the sliding door in the open position, finally shows another known sliding door ( US 5,520,423 A ), which has a system of two lock traps. Both lock traps are assigned to both functions above. In any case, this also raises the problem of optimum structural design.

The present invention is based on the problem, the known sliding door for a motor vehicle in such a way and further, that a secure fixation of the sliding door in the closed position with maximum ease of use with minimal design effort is guaranteed.

The above problem is solved by a sliding door for a motor vehicle according to the preamble of claim 1 by the features of the characterizing part of claim 1.

It is essential to consider that the additional lock assembly is not only the support of the main lock assembly in the fixation of the sliding door in the closed position, but that the sliding door is further fixed by the additional lock assembly in the open position. This ensures on the one hand a secure fixation of the sliding door in the closed position. On the other hand, the fixing of the sliding door is ensured in the open position, with minimal design effort.

Particularly advantageous is the fact that the additional lock assembly for fixing the sliding door in the closed position on the one hand and for the fixation of the sliding door in the open position on the other hand compared with the main lock assembly does not need to be particularly strong. As a result, the sliding door can be interpreted in an optimal manner so that oversizing is largely avoided. This generally leads to a reduction in production costs,

The preferred embodiment according to claim 5 with a latch, which has a first fork-shaped formation and a second fork-shaped formation, leads to a particularly simple and at the same time compact construction.

The further preferred embodiment according to claim 10 ensures a particularly simple structural design, since the pawl only on a single paragraph - latch - the latch attacks, the detent position of the latch is located in the open position sliding door and located in the closed position sliding door respectively identical.

A further increase in the ease of use can be achieved by the embodiment according to claim 15 by the pawl of the auxiliary lock assembly is designed to be motorized liftable. For the detailed embodiment of claim 16 gives preferred approaches.

According to another teaching, which has independent significance, a lock assembly for the sliding door of a motor vehicle is claimed, which corresponds to the above additional lock assembly. Reference may be made to the above statements.

Fig. 1

in schematischer Darstellung ein Kraftfahrzeug mit der erfindungsgemäßen Schiebetür,

Fig. 2

die erfindungsgemäße Schiebetür in der geöffneten Stellung in einer Schnittansicht gemäß Linie II-II in Fig. 1,

Fig. 3

die Schiebetür gemäß Fig. 2 in der geschlossenen Stellung,

Fig. 4

in schematischer Darstellung die Schloßfalle und die Sperrklinke der Zusatzschloßanordnung bei in der geöffneten Stellung befindlicher Schiebetür,

Fig. 5

die Darstellung gemäß Fig. 4 bei in der geschlossenen Stellung befindlicher Schiebetür,

Fig. 6

die Darstellung gemäß Fig. 5 bei in einer Zwischenstellung befindlicher Schiebetür,

Fig. 7

die Zusatzschloßanordnung mit einem Antrieb zum motorischen Ausheben der Sperrklinke in einer Darstellung gemäß Fig. 4,

Fig. 8

die Darstellung gemäß Fig. 7 mit einem Antrieb nach einer zweiten Ausführungsform,

Fig. 9

die Darstellung gemäß Fig. 7 mit einem Antrieb nach einer dritten Ausführungsform.

Further details, features and advantages of the present invention will be explained in more detail with reference to the drawing of preferred exemplary embodiments. In the drawing shows

Fig. 1

a schematic representation of a motor vehicle with the sliding door according to the invention,

Fig. 2

the sliding door according to the invention in the open position in a sectional view along line II-II in Fig. 1 .

Fig. 3

the sliding door according to Fig. 2 in the closed position,

Fig. 4

in a schematic representation of the lock latch and the pawl of the auxiliary lock assembly in befindlichem in the open position sliding door,

Fig. 5

the representation according to Fig. 4 when the sliding door is in the closed position,

Fig. 6

the representation according to Fig. 5 in an intermediate position sliding door,

Fig. 7

the additional lock assembly with a drive for motorized lifting of the pawl in a representation according to Fig. 4 .

Fig. 8

the representation according to Fig. 7 with a drive according to a second embodiment,

Fig. 9

the representation according to Fig. 7 with a drive according to a third embodiment.

Fig. 1 shows a motor vehicle, which is equipped with the sliding door according to the invention. The sliding door can be adjusted by a sliding movement in an open and in a closed position and thus closes a loading and unloading the motor vehicle. For this purpose, the sliding door is rail-guided, as will be explained in more detail below. But it can also be chosen other constructive solutions to realize the desired movement kinematics of the sliding door.

The sliding door is equipped with a main lock assembly 1 by which the sliding door can be fixed in the closed position. To support the main lock assembly 1 in the fixation of the sliding door in the closed position, an additional lock assembly 2 is provided. It is essential that the additional lock assembly 2 is further configured such that the sliding door through the auxiliary lock assembly 2 in the open position ( Fig. 2 ) is fixable.

The main lock assembly 1 is in the Fig. 1 to 3 indicated only schematically. The main lock assembly 1 preferably has the usual closing elements lock catch and pawl, which cooperate in the usual way with a closing wedge o. For the realization of the main lock assembly 1 but many other variants are conceivable. On the specific design of the main lock assembly 1 is not important for the present teaching.

The additional lock assembly 2 is designed so that it can absorb forces perpendicular to the direction of travel in the sliding door located in the closed position. This means in the first place perpendicular to the sliding door from the inside out acting forces. Such a configuration is particularly advantageous for cases in which objects or people bouncing against the door while driving. The additional lock arrangement 2 then counteracts the unwanted opening of the sliding door.

An optimal distribution of the holding forces results from the fact that when in the closed position sliding door, the main lock assembly. 1 and the auxiliary lock assembly 2 seen in the direction of travel are arranged on opposite sides of the sliding door.

There are several variants conceivable, at which height the main lock assembly 1 on the one hand and the auxiliary lock assembly 2 on the other hand are arranged on the sliding door. According to a preferred embodiment, in which the main lock arrangement 1 is arranged in a vertical direction in the middle region of the sliding door, the additional lock arrangement 2 is seen in a vertical direction in the lower area or in the upper area of the sliding door Sliding door is arranged. In principle, however, both the main lock arrangement 1 and the additional lock arrangement 2 can be arranged in a vertical direction in the middle region of the sliding door.

It can be the FIGS. 2 and 3 It can be seen that the additional lock assembly 2 has an engagement module 3, a first engagement member 4a and a second engagement member 4b, wherein the engagement module 3 comes in the open position in engagement with the first engagement member 4a in the adjustment of the sliding door 1 and thereby the sliding door 1 in the fixed in the open position ( Fig. 2 ). In the adjustment of the sliding door 1 in the closed position, the engagement module 3 then comes into engagement with the second engagement member 4b, whereby the sliding door 1 is fixed in the closed position. This is to be understood in the above sense, that the additional lock assembly 2, the main lock assembly 1 is supported in the fixation of the sliding door in the closed position.

It may be noted that, in principle, with appropriate arrangement and design of the main lock assembly 1 and additional lock assembly 2, the first engagement member 4a of the auxiliary lock assembly 2 can also take over the function of the closing wedge of the main lock assembly 1.

The representation according to Fig. 2 as well as the representations according to the 4 to 6 show a particularly preferred embodiment of the engagement module 3 of the auxiliary lock assembly 2. Here, the engagement module 3 for engaging with the first engagement member 4a and the second engagement member 4b a about a pivot axis 5 pivotable latch 6 and one of the latch 6 associated pawl 7. The latch 6 is between an open position ( Fig. 6 ) and a detent position ( Fig. 4, 5 ) adjustable and is held by the pawl 7 in the locked position.

The lock catch 6 allows engagement with the first engagement element 4a on the one hand and the second engagement element 4b on the other hand. In a preferred embodiment, the lock catch 6 is provided with a first fork-shaped recess 6a for engagement with the first engagement element 4a and with a second fork-shaped formation 6b for engagement with the second engagement element 4b. In the illustrated and thus preferred embodiment, the two fork-shaped formations open towards opposite directions and extend in opposite directions. The pivot axis 5 of the latch 6 is preferably arranged between the two fork-shaped formations 6a, 6b. The latch 6 is thus configured substantially H-shaped, as the representations in the 4 to 6 can be seen. It can also be seen from these illustrations that both fork-shaped formations 6a, 6b each have two fork arms of different lengths. The particular advantage of this embodiment will become apparent from the following explanation of the operation of the engagement module 3.

When adjusting the sliding door to the open position, in Fig. 3 to the left, the first engagement element 4a engages the first fork-shaped formation 6a (FIG. Fig. 6 ) and presses the latch in the Fig. 4 illustrated detent position. When adjusting the sliding door in the closed position, however, the second engaging member 4b comes into engagement with the second fork-shaped formation 6b and pushes the latch 6 again in the locked position. For this purpose, the lock latch 6 also pivots to the right, so that the pivoting of the latch 6 takes place during the adjustment of the sliding door in the open position and in the closed position in the same pivoting direction.

In the in the 4 to 6 illustrated and so far preferred embodiment, it is such that in the adjustment of the sliding door in the open position or in the closed position and in the engagement with the engagement module 3, the two engagement elements 4a, 4b relative to the engagement module 3 are each located on "fictitious" motion paths that lead past the pivot axis 5 of the latch 6. According to Fig. 4 leads the first engagement element 4a associated movement path above the pivot axis 5 of the lock latch 6 over. According to Fig. 5 leads the second engagement element 4b associated movement path below the pivot axis 5 of the lock latch 6 over. This does not mean that the two engagement elements 4a, 4b actually pass by the pivot axis 5. It should only be clear that the two engagement elements 4a, 4b are arranged offset from each other to ensure that they can come into engagement with the respective associated fork-shaped formation 6a, 6b.

With the above explanation, the illustration in FIG Fig. 6 It is also clear why the left fork arm of the first fork-shaped formation 6a or the right fork arm of the second fork-shaped formation 6b should be made shorter than the respective opposite fork arm. This ensures namely that the two engagement elements 4 a, 4 b come into engagement with the respectively associated, longer fork arm and thereby press the latch 6 into the rest position. For this it is further necessary that the lock catch 6 with respect to the above-described, fictitious trajectories, as in Fig. 6 shown, is arranged diagonally in the open position.

With the above embodiment of the latch 6 results in respect of the two engagement elements 4a, 4b a completely symmetrical operation of the latch 6. In the simplest case, the latch 6 is designed with respect to its pivot axis 5 substantially point-symmetrical. This can in particular bring manufacturing advantages.

The locking of the latch 6 in the locked position is in the in the 4 to 6 illustrated and so far preferred embodiment particularly simple and compact. For engagement with the pawl 7, the latch 6 has a catch in the form of a shoulder 8, said shoulder 8 is arranged on a fork arm of one of the two fork-shaped formations 6a, 6b. The pawl 7 can be brought by pivoting about its pivot axis 9 in engagement with and disengaged from the latch 6. Here it is so that the pawl 7 with the longer fork arm of the first fork-shaped formation 6a is engageable. Depending on the application, two notches can be provided here, for example, to realize a pre-rest and a main catch, as is common in the known side door locks.

In principle, it may be provided that a plurality of preferably parallel to each other arranged latch traps 6 are provided in order to accommodate greater holding forces can. In a particularly preferred embodiment, however, it is the case that the latch 6 is the only latch 6 of the engagement module 3.

In the in the FIGS. 2 and 3 illustrated embodiment, the pivot axis 5 of the latch 6 is aligned substantially vertically. It may also be advantageous to align the pivot axis 5 of the latch 6 substantially horizontally.

Numerous variants are conceivable for the design of the engagement elements 4a, 4b. The engagement elements 4a, 4b can be configured, for example, as a striker, as a latch bolt or the like.

The lock latch 6 described above with two fork-shaped formations 6a, 6b represents a particularly simple design option for realizing the above-described double function of the additional lock arrangement 2. Particularly advantageous is the fact that the movement of the latch 6 and the pawl 7 during closing and when opening the sliding door are identical.

The latch 6 is preferably biased in its open position against a stop 6c. The pawl 7 is preferably biased. In the in the 4 to 6 illustrated embodiment, a bias of the pawl 7 is provided in the incident position. For the respective bias of the latch 6 on the one hand and the pawl 7 on the other hand, the springs 10, 11 assigned.

It has already been pointed out that in the present case any structural realization of the movement kinematics of the sliding door, in particular of the displaceable Part 12 of the sliding door, is applicable. In the illustrated preferred embodiment, the sliding door is guided in an inner guide rail 13 and has a roller arrangement 14 for this purpose. The caster assembly 14 has two lateral guide rollers 15, 16 and another roller 17 for exempting the weight of the sliding member 12 of the sliding door. The guide rail 13 is arranged in the lower region of the loading and unloading.

In order to achieve a stable arrangement, according to an advantageous embodiment, the same guide rail 13 may be provided in the upper region of the loading and unloading. An outer guide rail 18 is preferably arranged on the outside of the vehicle body, which ensures stability, in particular during the adjustment of the sliding door into the open position. The coupling between the displaceable component 12 of the sliding door and the outer guide rail 18 is preferably via a pivot member 19th

The inner guide rail 13 has a portion bent toward the vehicle interior, which allows the "sliding" of the sliding part 12 of the sliding door so that the closed sliding door is initially flush with the vehicle body on one side. On the other hand, the pivot member 19 provides the desired flush termination by swinging in accordance with the adjustment of the sliding door in the closed position accordingly. When swinging the main lock assembly 1 is activated accordingly, so that it ensures a fixation of the sliding door in the closed position. Due to the above-described, curved configuration of the inner guide rail 13, the roller assembly 14 must be pivotally coupled to the sliding part 12 of the sliding door about a pivot axis 20. This results from the synopsis of FIGS. 2 and 3 ,

The engagement module 3 and the roller assembly 14 are arranged together on a support member 21, wherein on the support member 21 of the sliding part 12 of the sliding door is attached. The engagement module 3 has two inlet slots 22 for the two engagement elements 4a, 4b.

There are a number of possibilities conceivable, the pawl 7 of the auxiliary lock assembly 2 dig and thus release the sliding door. At the in Fig. 7 illustrated embodiment, the pawl 7 of the engagement module 3 via a Bowden cable 23 can be raised and this coupled to the soul 24 of the Bowden cable 23. This allows a space-saving and flexible arrangement of the engagement module. 3

It may further be provided that the additional lock assembly 2 is actuated by a motor and that for this purpose the pawl 7 of the engagement module 3 by a drive motor can be raised. For this purpose, the drive is equipped with a corresponding drive motor 25. The drive can, as in Fig. 7 shown, over the Bowden cable 23 with the pawl 7 are engaged.

But it can also be provided that the drive next to the drive motor 25 has an actuating element 26, and that the actuating element 26 for motorized lifting of the pawl 7 in engagement with the pawl 7 can be brought. This is schematically in Fig. 8 shown.

In a further preferred embodiment, which enables, inter alia, a particularly quiet operation, it is provided that the drive comprises a drive motor 25 which is coupled to the motorized lifting of the pawl 7 via a flexible traction means 27, preferably via a cable with the pawl 7. At the in Fig. 9 illustrated and so far preferred embodiment, the cable 27 is wound directly onto the drive shaft of the drive motor 25.

Finally, it should be pointed out that the main lock assembly 1 is preferably equipped with a lock mechanism, not shown, for the realization of various functional states. Such functional states are, for example, the locking function CL known for side-door locks, anti-theft function DL or child-safety function CS. The additional lock assembly 2 is then preferably connected to the lock mechanism of the main lock assembly 1. Thus, the main lock assembly 1 includes, so to speak, the "intelligence" of the sliding door, while the additional lock assembly 2 has only the closure elements described above.

In principle, the Hauptschloßanordmmg 1 as described above in connection with the additional lock assembly 2 may be designed to be motor-actuated. It is also conceivable that only a single drive for the motorized operation of both the main lock assembly 1 and the auxiliary lock assembly 2 is provided. The two lock assemblies 1, 2 can then be connected to each other, for example via a Bowden cable drive technology.

In any case, it is in any case the case that when the sliding door is opened from the closed position, first the additional lock arrangement 2 and then the main lock arrangement 1 opens. The reason for this order is that jamming of the auxiliary lock assembly 2 should be avoided. This Verklemmneigung arises from the fact that the additional lock assembly 2 is usually not designed to accommodate the entire holding force of the sliding door located in the closed position, so that at too early opening of the main lock assembly 1 to a slight deformation of the additional lock assembly 2, and so that a corresponding deadlock can occur.
The sliding door is preferably provided for the operation of an outside door handle 28 and a door inner handle, not shown. It is also conceivable, however, an exclusively electrical operation, for example via a remote control o.

Claims (17)

1. Sliding door for a motor vehicle, wherein the sliding door is adjustable by means of a sliding movement into an open position and into a closed position, wherein a main lock arrangement (1) is provided, by means of which the sliding door can be immobilized in the closed position, wherein an additional lock arrangement (2) is provided for assisting the main lock arrangement (1) when the sliding door is immobilized in the closed position, characterised in that the additional lock arrangement (2) is furthermore configured in such a manner that the sliding door can be immobilized in the open position by the additional lock arrangement (2), and in that the additional lock arrangement (2) is configured in such a manner that, when the sliding door is installed in the motor vehicle and is in the closed position, said additional lock arrangement can absorb forces acting from the inside outwards perpendicularly to the direction of travel.
2. Sliding door according to Claim 1, characterized in that, when the sliding door is installed in the motor vehicle and is in the closed position, the main lock arrangement (1) and the additional lock arrangement (2) are arranged on opposite sides of the sliding door, as seen in the direction of travel.
3. Sliding door according to either of the preceding claims, characterized in that, when the sliding door is installed in the motor vehicle, the main lock arrangement (1) is arranged in the central region of the sliding door, as seen in a vertical direction, preferably in that, when the sliding door is installed in the motor vehicle, the additional lock arrangement (2) is arranged in the lower region or in the upper region of the sliding door, as seen in a vertical direction.
4. Sliding door according to one of the preceding claims, characterized in that the additional lock arrangement (2) has an engagement module (3), a first engagement element (4a) and a second engagement element (4b), wherein, when the sliding door is adjusted into the open position, the engagement module (3) comes into engagement with the first engagement element (4a) and thereby immobilizes the sliding door in the open position, and wherein, when the sliding door is adjusted into the closed position, the engagement module (3) comes into engagement with the second engagement element (4b) and thereby immobilizes the sliding door in the closed position, preferably in that, for the engagement with the first engagement element (4a) and the second engagement element (4b), the engagement module (3) has a lock latch (6), pivotable around a piovot pin (5), and a detent (7) assigned to the lock latch (6), in that the lock latch (6) is adjustable between an open position and a latching position and is held in the latching position by the detent (7), furthermore preferably in that the lock latch (6) has a first fork-shaped formation (6a) for the engagement with the first engagement element (4a) and a second fork-shaped formation (6b) for the engagement with the second engagement element (4b), furthermore preferably in that the two fork-shaped formations (6a, 6b) open towards opposite directions and run in opposite directions.
5. Sliding door according to Claim 4, characterized in that the pivot pin (5) of the lock latch (6) is arranged between the two fork-shaped formation (6a, 6b), preferably in that the two fork-shaped formations (6a, 6b) each have two fork arms of differing length.
6. Sliding door according to Claim 4 or 5, characterized in that, when the sliding door is adjusted into the open position, the first engagement element (4a) comes into engagement with the first fork-shaped formations (6a) and presses the lock latch (6) into the latching position, and in that, when the sliding door is adjusted into the closed position, the second engagement element (4b) comes into engagement with the second forkshaped formation (6b) and presses the lock latch (6) into the latching position, preferably in that the lock latch (6) is pivoted in the same pivoting direction when the sliding door is adjusted into the open position and into the closed position.
7. Sliding door according to one of Claims 4 to 6, characterized in that, when the sliding door is adjusted into the open position or into the closed position and upon the engagement with the engagement module (3), the two engagement elements (4a, 4b) are each located, as seen relative to the engagement module (3), on movement paths which lead past the pivot pin (5) of the lock latch (6), preferably in that the movement paths are arranged substantially parallel to each other and spaced apart from each other.
8. Sliding door according to one of Claims 4 to 7, characterized in that the lock latch (6) is configured to be substantially point-symmetrical with respect to its pivot pin (5).
9. Sliding door according to one of Claims 4 to 8, characterized in that the lock latch (6) has a step (8) for the engagement with the detent (7), preferably in that the step (8) is arranged on a fork arm of one of the two fork-shaped formations (6a, 6b).
10. Sliding door according to one of Claims 4 to 9, characterized in that the lock latch (6) is the sole lock latch (6) of the engagement module (3).
11. Sliding door according to one of the preceding claims, characterized in that the engagement elements (4a, 4b) are configured as striker hoops, striker bolts or the like.
12. Sliding door according to one of the preceding claims, characterized in that the sliding door is guided in a guide rail (13) and has a moving roller arrangement (14) for this purpose.
13. Sliding door according to one of the preceding claims, characterized in that the detent (7) of the engagement module (3) can be raised via a Bowden cable (23) and, for this purpose, is coupled to the core (24) of the Bowden cable (23).
14. Sliding door according to one of the preceding claims, characterized in that the detent (7) of the engagement module (3) can be raised in a motorized manner by means of a drive.
15. Sliding door according to Claim 14, characterized in that the drive has a drive motor (23) and an actuating element (26), and in that, for the motorized raising of the detent (7), the actuating element (26) can be brought into engagement with the detent (7), or in that the drive has a drive motor (25) which, for the motorized raising of the detent (7), is coupled to the detent (7) via a flexible traction means (27), preferably via a cable pull.
16. Sliding door according to one of the preceding claims, characterized in that the main lock arrangement (1) is provided with a lock mechanism for realising various functional states, such as locking function CL, theft protection function DL or child protection function CS, and in that the additional lock arrangement (2) is connected to the lock mechanism of the main lock arrangement (1).
17. Sliding door according to one of the preceding claims, characterized in that the arrangement is provided in such a manner that, during the opening of the sliding door from the closed position, first of all the additional lock arrangement (2) and then the main lock arrangement (1) open.

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