EP2492423B1 - Barrier with opening trends - Google Patents

Description

The present invention relates to a locking mechanism for a motor vehicle door according to the preamble of claim 1. The term motor vehicle door is to be interpreted comprehensively and also includes motor vehicle flaps, covers, sliding doors, hoods and all closure elements that cover openings in a vehicle.

In the EP 2 161 398 A2 is a barrier with a catch, an intermediate lever and a pawl mounted thereon known.

In the US 3,386,761 , from which the invention proceeds, is in Fig. 5 a locking mechanism shown that includes a rotary latch, which is loaded by a spring in the opening direction. This catch is positively locked in the closed state by a pawl. The pawl is pivotally mounted on a pawl lever and loaded by a spring in the blocking direction to the catch. The pawl lever is loaded by another spring in the opening direction. The opening of the lock is prevented by the positive connection to a locking lever. The locking lever is loaded by a further spring in the closing direction. This locking lever can be brought by means of a solenoid out of engagement with the pawl lever, so that the pawl lever pivots with the pawl of the engagement region of the rotary latch and this opens. When closing the door, the striker, not shown, rotates the catch in the closing direction. Only the pawl, without pawl lever moves in the opening direction and closed immediately by the pawl spring.

In this embodiment, however, the pawl and the rotary latch are arranged to each other such that the rotary latch on the pawl generates a torque in the opening direction. This is indicated by the force parallelogram in Fig. 2 of the US 3,386,761 shown in detail. However, this arrangement has the disadvantage that the pawl can move in the opening direction with strong vibration forces. By the movement of the pawl in the opening direction of the blocking of the catch is released, so that the lock and thus the vehicle door can open.

The invention has for its object to provide a barrier, which has a low noise when closing, but keeps the door safely in the closed position even with vibration and other mechanical influences.

To solve this problem, the barrier invention is characterized by the features specified in claim 1. Details of the invention will become apparent from the dependent claims.

The blocking mechanism according to the invention consists i.a. from a catch and a pawl mechanism, which are usually part of a motor vehicle lock. These motor vehicle locks hold in conjunction with a striker vehicle doors, trunk lid, trunk hoods, hoods, trunk lid or sliding doors in the closed position, or can be opened by means of the locks. The term motor vehicle door stands for all elements that cover openings in vehicles.

For side doors, the locks with the locking mechanisms are usually mounted in the doors, with the corresponding firing bracket to the body, preferably on the B or C-pillar is attached. In tailgate lids, however, the lock with the locking mechanism is attached to the body, wherein the striker on the moving part, the trunk lid is complained. The positioning of the components thus has no influence on the invention. The same applies to the geometric shape of the striker. As a striker, all elements are designated, e.g. also locking bolts or strikers, which form a positive connection with the locking mechanism.

The locking mechanism according to the invention consists of a rotary latch and a pawl mechanism. The catch is in closed door with the striker in positive connection. When opening the door, this positive connection is released. The catch is preferably a U-shaped element which is pivotally mounted. A spring loads the catch in the opening direction. During the closing process, the striker presses on one leg of the U-shaped rotary latch, whereby the other leg of the rotary latch rotates around the striker and thus forms a positive connection with the striker. This position of the catch is when the door is closed fixed by a pawl. Both the pawl spring and the door seal exert pressure on the pawl via the striker and the catch. Generated the force of the catch on the pawl a torque that stabilizes the positive connection between pawl and rotary latch, for example, because the catch presses the pawl against a fixed stop, this loading direction is referred to as "in the closing direction". As the opening direction, the direction of movement is referred to, in which the rotary latch pushes the pawl, or the pawl assembly in the direction in which the pawl is disengaged from the catch.

The essence of the invention is now to arrange the contact surfaces between the catch, pawl and pawl lever, and their pivot points such that the force of the catch acting on the pawl, generates a torque which enhances the blocking between pawl and rotary latch. At the same time generates the same force of the rotary latch, a torque on the assembly of pawl lever and pawl, through which the assembly of pawl lever and pawl is loaded in the opening direction.

The force transmitted by the catch to the pawl is generated by a rotary latch spring and the door seal. The rotary latch spring engages directly on the rotary latch and generates a torque that loads the rotary latch in the opening direction. A much higher force is generated by the door seal when the door is closed. The door seal, which is arranged between the body and the door, generates a force on the door structure, also referred to as a door frame, on the lock, in particular on the locking mechanism, in particular on the catch. When the door is closed, the rotary latch is in positive connection with the striker, whereby the power flow is closed. The force thus generated is transmitted from the catch to the pawl or to the assembly of pawl lever and pawl.

Both pawl and pawl lever are loaded by a spring in the direction of the catch. The pawl is shaped so that it is mounted on the pawl lever and welißt a contour which is in positive connection with a contour of the pawl lever. The spring force of the rotary latch spring is now transmitted to this contour of the pawl and directly on the pawl lever contour on the pawl lever, which is thereby loaded in the direction of the rotary latch.

Both rotary latch and pawl and pawl lever are designed such that the rotary latch on the assembly of pawl lever and pawl generates a torque that loads the assembly in the opening direction. When the door is closed, the movement of the pawl pawl lever assembly in the opening direction is prevented by the locking lever. This is done by the locking lever blocking the pawl lever in the opening direction. During the opening process, the locking lever is pivoted out of the path of the pawl lever, whereby the positive engagement is released and the pawl-pawl lever assembly moves in the opening direction.

The locking lever is loaded by a spring in the direction in which it blocks the pawl lever. By a motor drive or manually, the locking lever can be disengaged from the pawl lever.

It may be clarified at this point that the term "intermediate lever" used in the claims corresponds to the term "pawl lever" used in the description, even if this relationship has already been taken from the preceding description and from the description of the figures to the Fig. 1 to 5 evident.

The opening operation described above is always associated with the fact that the engagement between the pawl and the catch is canceled. This can be done in a pulse-like manner in a preferred variant by the pawl is pulled out of the range of motion of the rotary latch. This type of lifting the pawl is always associated with a corresponding pulse-like noise. In a particularly preferred embodiment, it is therefore provided that the opening operation is accompanied by a rolling movement of the pawl on the rotary latch. Further preferably, the pawl rotates in the course of the rolling movement of the main catch or pre-catch the catch out. The rolling movement described above ensures that a pulse-like noise by canceling the engagement between pawl and rotary latch does not occur.

According to a further teaching according to claim 14, which has independent significance, a motor vehicle door lock is claimed with a barrier. The proposed motor vehicle door lock can be positioned in a motor vehicle door or in a door frame. The motor vehicle door lock keeps the motor vehicle door closed in conjunction with a striker positioned on the door frame or door or opens the motor vehicle door accordingly, with a detent having a catch positively connected to the striker when the motor vehicle door is closed, with a detent pawl holding the catch closed motor vehicle door, in a pre-locking position or a main detent position, blocked and with an assembly consisting of a pivotable intermediate lever and the pivotally mounted therein pawl which blocks the catch when the vehicle door is closed, in a pre-locked position or a main detent position.

Essential to this further teaching is that the catch loaded with closed motor vehicle door, the pawl in the closing direction, but also loaded the assembly of intermediate lever and pawl in the opening direction.

With regard to the advantages of further teaching and possible embodiments may be made to the full extent to the comments on the proposed barrier.

Fig. 1

ein Sperrwerk in geöffneter Position,

Fig. 2

das Sperrwerk gemäß Fig. 2 während des Schließvorganges,

Fig. 3

das Sperrwerk gemäß Fig. 1 in Hauptraststellung,

Fig. 4

einen vergrößerten Ausschnitt aus Fig. 3,

Fig. 5

das Sperrwerk gemäß Fig. 3 mit ausgehobenem Sperrhebel,

Fig. 6

ein weiteres Sperrwerk in geöffneter Position,

Fig. 7

das Sperrwerk gemäß Fig. 6 während des Schließvorganges,

Fig. 8

das Sperrwerk gemäß Fig. 6 in Hauptraststellung,

Fig. 9

das Sperrwerk gemäß Fig. 6 in einem ersten Abschnitt des Öffnungsvorgangs und

Fig. 10

das Sperrwerk gemäß Fig. 6 in einem zweiten Abschnitt des Öffnungsvorgangs.

The invention will be described below with reference to an embodiment. From the accompanying drawings shows:

Fig. 1

a locking mechanism in the open position,

Fig. 2

the barrage according to Fig. 2 during the closing process,

Fig. 3

the barrage according to Fig. 1 in main position,

Fig. 4

an enlarged section Fig. 3 .

Fig. 5

the barrage according to Fig. 3 with raised locking lever,

Fig. 6

another blockage in the open position,

Fig. 7

the barrage according to Fig. 6 during the closing process,

Fig. 8

the barrage according to Fig. 6 in main position,

Fig. 9

the barrage according to Fig. 6 in a first section of the opening process and

Fig. 10

the barrage according to Fig. 6 in a second section of the opening process.

Fig. 1 shows an inventive locking mechanism in the open position. The firing bow 2 is not in engagement with the rotary latch 1. The pawl 3 is mounted on the pawl mandrel 7, wherein the pawl mandrel 7 is positioned on the pawl lever 4. The pawl lever 4 is pivotally mounted on a mandrel 8. The force of the pawl spring 5 engages the lever arm 9 of the pawl 3 and is transmitted to the lever arm 10 of the pawl lever 4. This causes a movement of the pawl lever 4 in a clockwise direction. The movement of the pawl lever 4 is stopped via the Blockadehebelarm 11 which abuts against the contour 12 of the locking lever 6. A locking lever spring 13 loads the locking lever 6 in the closing direction.

When closing the locking mechanism, the striker 2 moves, as in Fig. 2 In this case, the striker 2 presses on the contour 15 of the catch 1, whereby the catch 1 moves around the rotary mandrel 16 in the closing direction. In parallel, the contour 18 of the rotary latch pivots the pawl 3 on the contour 17 in the counterclockwise direction in the opening direction. This is done against the force of the pawl spring 5 is particularly clear in Fig. 2 in that, during the closing operation, only the pawl 3 pivots about the pawl mandrel 7, the pawl lever 4 remaining in its position. After the catch 1 has reached its end position, the pawl 3 falls due to the spring force of the spring 5 back to its original position (see Fig. 3 ). Due to the low mass of the pawl 3 is formed when hitting the pawl lever 4 only a slight noise.

In Fig. 3 the locking mechanism is shown in closed position. Here, the rotary latch 1 presses on the pressure contour 23 on the locking contour 19 of the pawl third

The point of attack on the pawl contour 19, on which the pressure contour 23 of the catch 1 engages and the pivot point 7 is mounted on the pawl 1, are arranged to each other that the lever arm 9 of the pawl 3, the lever arm 10 of the pawl lever 4 charged. The locking lever 6 blocked with the contour 12 on the blocking arm 11, the pawl lever 4. Due to this assignment blocks the pawl 3 in conjunction with the pawl lever 4 and the locking lever 6, the movement of the catch 1 in the open position.

In Fig. 4 is the rotary latch 1, the pawl 3, the pawl lever 4 and the locking lever 6 is shown enlarged. The direction of the force exerted by the rotary latch 1 on the pawl 3 is shown in this view by the arrow 20. The force direction 20 extends between the pivot point 7 of the pawl 3 and the pivot point 8 of the pawl lever 4. This causes the pawl 3, a clockwise torque is generated. Even with vibrations, the pawl 3 always tries to move in the clockwise direction. However, this movement of the pawl 3 is positively locked by the lever arm 10 of the pawl lever 4 and the lever arm 9 of the pawl 3. Thus, a torque in the closing direction is generated on the pawl 3 in the closed position. On the other hand, if a torque is generated counterclockwise, the pawl can escape against the spring force of the pawl spring 5. In this case, a torque is generated in the opening direction.

Since the pawl 3 is mounted on the pawl lever 4, a torque is generated on the pawl lever 4 at the same time under load of the pawl 3. In this arrangement, the pivot points 7, 8 and the orientation of the force according to arrow 20, this torque acts with respect to the pivot point 8 counterclockwise. However, the movement of the pawl lever 4 is stopped by the blocking of the pawl lever 4 by the locking contour 21 on the locking lever 6. However, the locking lever 6 is pivotable about the pivot point 22 (see Fig. 5 ). In the view of FIG. 5 is the locking lever 6 out of engagement with the pawl lever 6. The previously described torque on the pawl lever 4, which acts counterclockwise about the pivot point 8, rotates the assembly of pawl lever 4 and pawl 3 outside the engagement region of the rotary latch 1 and thus in the opening direction. If the torque acts on the pawl lever 4 counterclockwise, the Assembly of pawl lever 4 and pawl in the region of the rotary latch 1 and thus loaded in the closing direction.

The Fig. 6 to 10 show a locking mechanism according to the invention in a further embodiment. The basic function of the components catch 1, pawl 3, pawl lever 4 and locking lever 6 corresponds to the basic function of the corresponding components in the Fig. 1 to 5 illustrated barrier. Accordingly, it is also in the in the Fig. 6 to 10 Locking mechanism shown around a locking mechanism for a motor vehicle door lock, which is positioned in the mounted state in a motor vehicle door or in a door frame and then holds the motor vehicle door closed or opens in conjunction with a positioned on the door frame or door shooting bracket 2. The following is the operation of the in the Fig. 6 to 10 illustrated, the term used in the claims "intermediate lever" again corresponds to the term used in the description "pawl lever".

The barrier is equipped with a rotary latch 1, which is positively connected with the vehicle door closed with the striker 2 ( Fig. 8 ). Next, a pawl 3 is provided, which the catch 1 with the vehicle door closed in a pre-locked position, not shown or in Fig. 8 shown blocked main position. A pawl lever 4 (intermediate lever 4) and the above pawl 3 form an assembly.

The direction of the force of the rotary latch 1 on the pawl 3 transmitting force is in Fig. 8 indicated by the reference numeral 20. From this representation shows that it is also in the in the Fig. 6 to 10 illustrated embodiment is such that the rotary latch 1 when the vehicle door is closed, the pawl 3 in the closing direction, in Fig. 8 relative to the pawl lever 4 in the clockwise direction, but charged, but also the assembly of pawl lever 4 and pawl 3 total in the opening direction, in Fig. 8 otherwise counterclockwise, loaded relative to the blocking mechanism. The pawl 3 is pivotally mounted on the pawl lever 4 about a pawl axis 3a. The pawl lever 4, however, is pivotally mounted about a pawl lever axis 4a on a fixed part of the motor vehicle door lock, in particular on a housing part of the motor vehicle door lock. The catch 1 is according to a rotary latch axis la in turn on a fixed part, in particular on a housing part of the motor vehicle door lock, pivotally mounted.

Since all the considerations mentioned above on the first embodiment with respect to a first torque and a second torque for the in the Fig. 6 to 10 illustrated embodiment, may be made to the statements there.

A first difference in the Fig. 6 to 10 illustrated embodiment with respect to in the Fig. 1 to 5 illustrated embodiment is that the pawl 3 is coupled relative to the pawl lever 4 with a first spring assembly 5a and that the pawl lever 4 is coupled relative to a fixed part by means of a second spring arrangement 5b. The mode of action of the two spring arrangements 5a, 5b will be explained in detail below.

Like the one in the Fig. 1 to 5 embodiment shown is also in the in the Fig. 6 to 10 illustrated embodiment, a locking lever 6 is provided, the pawl lever 4 against movement in the opening direction, in Fig. 8 counterclockwise, blocked. The pawl lever 8 is for releasing the locking engagement with the locking lever 6 about a locking lever axis 6a, in Fig. 8 counterclockwise, swiveling. The locking lever 6 is closed by the locking lever spring 13 in the closing direction, in Fig. 8 clockwise, biased.

Interesting in the in the Fig. 6 to 10 illustrated embodiment is the fact that the pawl 3 on the pawl lever 4 from a sunken position out, in which the pawl 3, the catch 1 in the main latching position and in the possibly present pre-locked position ( Fig. 8 ), both in the closing direction (in Fig. 8 clockwise) as well as in the opening direction (in Fig. 8 counterclockwise), here it is pivotable. Any kind of stop the relative movement of the pawl 3 on the pawl lever 4 is therefore not provided. However, the pawl 3 with respect to both directions of movement in a middle position, here and preferably in Essentially in the sunken position, biased. The middle position is best described according to Fig. 6 remove.

The closing process in which in the Fig. 6 to 10 illustrated embodiment corresponds essentially to the closing process in which in the Fig. 1 to 5 illustrated embodiment. The striker 2 moves into the inlet mouth 14 of the rotary latch 1, wherein the catch 1 moves around the rotary latch axis 1a in the closing direction. In parallel, the contour 18 of the rotary latch 1 pivots the pawl 3 on the contour 17 in Fig. 6 counterclockwise in the opening direction relative to the pawl lever 4, which takes place against the force of the first spring assembly 5a. Fig. 8 shows the state in which the pawl 3 has fallen due to the spring force of the spring assembly 5a in its original position. In this retracted position, in which the pawl 3 blocks the catch 1 in the main latching position, the pawl 3 is located on a boundary surface 24 of the catch 1, whereby the further movement of the pawl 3 in the closing direction, in Fig. 8 clockwise, is blocked. Here it is clear that it may be advantageous that the above-mentioned center position seen from the raised position of the pawl 3 from beyond the in Fig. 8 shown, sunken position of the pawl 3 is located. This ensures namely that the spring assembly 5a presses at least slightly on the boundary surface 24 on the rotary latch 1 to counteract any rattling noises.

Especially interesting in the in the Fig. 6 to 10 illustrated embodiment, the opening operation, which is made up of the sequence of Fig. 8 . 9 and 10 results.

In a synopsis of Fig. 8 . 9 and 10 it is noticeable that starting from the state of the closed motor vehicle door ( Fig. 8 ), in which the locking lever 6 blocks the pawl lever 4 against movement in the opening direction, a movement of the locking lever 6 in a non-blocking position (FIG. Fig. 8 . 9 ) triggers a driven by the rotary latch 1 rolling movement of the pawl 3 on the rotary latch 1. The rolling movement results from a synopsis of Fig. 9 and 10 , Here it is clear that the rolling movement takes place in the region of the main catch 25 or the pre-catch 26 of the rotary latch 1. The main catch 25 and the pre-catch 26 serve to take the main rest position or the pre-locking position by the catch 1, in that the pawl 3 is in blocking engagement with the main catch 25 or the pre-catch 26 when the catch 1 is in the main catch position or in the pre-engaged position.

Overall, a synopsis of Fig. 8 to 10 in that the pawl 3 turns out of the main catch 25 or out of the pre-catch 26 in the course of the rolling movement, which brings about the effect of noise reduction during the opening process mentioned above.

The term "rolling motion" is to be understood in the present case. This is not only a pure "rolling" of the pawl 3 relative to the catch 1 meant, but also a mixture of rolling and sliding movement between pawl 3 and catch 1. With such a rolling motion can be impulsive noises when canceling the engagement between pawl 3 and Avoid catch 1 as far as possible.

A prerequisite for the above-mentioned rolling movement of the pawl 3 on the rotary latch 1 is in the in the Fig. 6 to 10 illustrated embodiment that the pawl 3, starting from the above-mentioned center position against the spring force of the first spring assembly 5a relative to the pawl lever 4 in the closing direction is deflectable. This deflection shows a synopsis of Fig. 8 . 9 and 10 , Correspondingly, the spring arrangement 5a is a so-called center-zero spring, which allows a deflection of the pawl 3 out of the middle position in both pivoting directions, in each case against the spring force of the spring arrangement 5a. The pawl 3 here and preferably has a driver 27 which is aligned in the middle position to a corresponding driver 28. Both drivers 27, 28 are, as from the Fig. 6 to 10 seen, coupled to the spring assembly 5a. The second spring arrangement 5b is used in accordance with the bias of the pawl lever 4 in the closing direction, in Fig. 6 clockwise.

The opening process is now based on the state of the closed motor vehicle door, in which the locking lever 6, the pawl lever 4 against movement in the opening direction, in Fig. 8 blocked against counterclockwise movement. The opening process is triggered by the locking lever 6 in a non-blocking position, in Fig. 8 counterclockwise, in in the Fig. 9 shown position is moved. Subsequently, the rotary latch 1 drives the pawl 3 on the pawl lever 4 in the closing direction (in Fig. 9 clockwise). Here and preferably at the same time the rotary latch 1 drives the pawl lever 4 in the opening direction, in Fig. 9 counterclockwise. The transition from Fig. 9 on Fig. 10 shows that the pawl 3, as mentioned above, rolls on the rotary latch 3 until the pawl 3 finally comes out of engagement with the rotary latch 1 and then the catch 1 in Fig. 6 shown open position reached. This pivotal movement of the pawl 3 on the pawl lever 4 is here and preferably more than 10 ° and is not limited in particular by a stop.

Particularly noteworthy in the in the Fig. 6 to 10 illustrated embodiment is the fact that the pawl lever 4 never falls on the catch 1, but is always held by the locking lever 6. Namely, the locking lever 6 is coupled or coupled to the pawl lever 4 so that the locking lever 6, here and preferably independently of its position, limits the movement of the pawl lever 4 in the closing direction. For this purpose, the locking lever 6 and the pawl lever 4 each have an engagement contour 29, 30 which extend here and preferably concentrically to the locking lever axis 6a and which are engaged or engageable with each other for the above coupling. Of particular interest is the fact that this movement limit is guaranteed by a corresponding length of the engagement contours 29, 30 regardless of the position of the locking lever 6. In principle, it is of course also conceivable that such an engagement contour 29, 30 is provided exclusively on the locking lever 6 or exclusively on the pawl lever 4. Such a contour would then interact with a corresponding driver o. The like. Of the other lever.

According to another teaching, which has independent significance, a proposed motor vehicle door lock is claimed as such with a proposed barrier. Reference may be made to all versions of the proposed barrier. <B> LIST OF REFERENCES: </ b> 1 catch 1a Rotary latch axis 2 striker 3 pawl 3a Pawl axis 4 Ratchet lever 4a Ratchet lever axis 5 Pawl spring 5a First spring arrangement 5b Second spring arrangement 6 locking lever 6a Locking lever axis 7 Pawl Dorn 8th Mandrel of pawl lever 9 Lever arm of the pawl 10 Lever arm of the pawl lever 11 Blockadehebelarm 12 Contour on the locking lever 13 Latch spring 14 Inlet mouth of the catch 15 Contour on the rotary latch 16 Rotary latch mandrel 17 Contour on the pawl 18 Contour on the rotary latch 19 Locking contour on the pawl 20 Force direction of the transmitted from the catch on the pawl force 21 Locking contour on the locking lever 22 Locking lever Dorn 23 pressure contour 24 boundary surface 25 main catch 26 pre catch 27 Driver on pawl 28 Driver on pawl lever 29 Engagement contour on locking lever 30 Engagement contour on pawl lever

Claims (15)

1. Detent mechanism for a motor vehicle door lock which is positioned in a motor vehicle door or in a door frame and which, in conjunction with a striker (2) positioned on the door frame or on the door, keeps the motor vehicle door closed or opens same, with a rotary latch (1) which, when the motor vehicle door is closed, is connected in an interlocking manner to the striker (2), with a pawl (3) which blocks the rotary latch (1) in a pre-latching position or a main latching position when the motor vehicle door is closed, with an assembly consisting of an intermediate lever (4) and a pawl mounted pivotably thereon, characterized in that, when the motor vehicle door is closed, the rotary latch (1) loads the pawl (3) in the closing direction, but also loads the assembly consisting of intermediate lever (4) and pawl (3) in the opening direction.
2. Detent mechanism for a motor vehicle door lock according to Claim 1, characterized in that a first torque which arises by the transmission of force from the rotary latch (1) to the pawl (3) loads the pawl (3) in the closing direction, in that, however, a second torque which arises by the transmission of force from the rotary latch (1) to the pawl (3), also loads the assembly consisting of pawl (3) and intermediate lever (4) in the opening direction.
3. Detent mechanism for a motor vehicle door lock according to Claim 2, characterized in that the force of a rotary latch spring and/or the force of a door seal, which force is transmitted via the door structure and/or the striker (2) to the rotary latch (1), produces the first torque and the second torque.
4. Detent mechanism for a motor vehicle door lock according to one of Claims 1 to 3, characterized in that a spring (5) is arranged between a lock housing and the pawl (3) and loads the intermediate lever (4) in the closing direction via the pawl (3).
5. Detent mechanism for a motor vehicle door lock according to one of Claims 1 to 4, characterized in that, when the motor vehicle door is closed, a blocking lever (6) blocks the intermediate lever (4) against a movement in the opening direction.
6. Detent mechanism for a motor vehicle door lock according to Claim 5, characterized in that the blocking lever (6) is loaded by a spring (13) in the direction in which the blocking lever (6) blocks the opening movement of the assembly consisting of the intermediate lever (4) and the pawl (3).
7. Detent mechanism for a motor vehicle door lock according to one of Claims 1 to 6, characterized in that the pawl (3) is movable, in particular pivotable, on the intermediate lever (4) both in the closing direction and in the opening direction out of an engaged position, in which the pawl (3) blocks the rotary latch (1) in the main latching position and in the optionally present pre-latching position, and preferably in that the pawl (3) is prestressed with respect to both directions of movement into a central position, preferably substantially into the engaged position.
8. Detent mechanism for a motor vehicle door lock according to Claim 7, characterized in that, in an engaged position in which the pawl (3) blocks the rotary latch (1) in the main latching position and in the optionally present pre-latching position, the pawl (3) lies against a boundary surface (24) of the latch (1), as a result of which a further movement of the pawl (3) in the closing direction is blocked.
9. Detent mechanism for a motor vehicle door lock according to Claim 7 or 8, characterized in that, starting from the state of the closed motor vehicle door, in which the blocking lever (6) blocks the intermediate lever (4) against a movement in the opening direction, a movement of the blocking lever (6) into a non-blocking position triggers a rolling movement of the pawl (3) on the rotary latch (1), said rolling movement being driven by the rotary latch (1).
10. Detent mechanism for a motor vehicle door lock according to Claim 9, characterized in that, when the rotary latch (1) is in the main latching position and in the optionally present pre-latching position, the pawl (3) is in blocking engagement with a main catch (25) or preliminary catch (26) of the rotary latch (1), and in that the rolling movement takes place in the region of the main catch (25) or of the preliminary catch (26) of the rotary latch (1).
11. Detent mechanism for a motor vehicle door lock according to Claim 9 or 10, characterized in that the pawl (3) rotates out of the main catch (25) or preliminary catch (26) over the course of the rolling movement.
12. Detent mechanism for a motor vehicle door lock according to one of Claims 9 to 11, characterized in that, starting from the state of the closed motor vehicle door, in which the blocking lever (6) blocks the intermediate lever (4) against a movement in the opening direction, a movement of the blocking lever (6) into a non-blocking position triggers a movement, in each case driven by the rotary latch (1), of the pawl (3) on the intermediate lever (4) in the closing direction and in particular simultaneously thereto triggers a movement of the intermediate lever (4) in the opening direction, preferably in that said movement of the pawl (3) on the intermediate lever (4) is more than 10°.
13. Detent mechanism for a motor vehicle door lock according to one of Claims 1 to 12, characterized in that the blocking lever (6) is coupled or can be coupled to the intermediate lever (4) in such a manner that the blocking lever (6), preferably irrespective of its position, restricts the movement of the intermediate lever (4) in the closing direction, preferably in that, for this purpose, the blocking lever (6) and/or the intermediate lever (4) have or has an engagement contour (29, 30), preferably, in that the engagement contour (29, 30) or the engagement contours (29, 30) runs or run concentrically with respect to a blocking lever axis (6a).
14. Motor vehicle door lock which can be positioned in a motor vehicle door or in a door frame and which, in conjunction with a striker (2) positioned on the door frame or on the door, keeps the motor vehicle door closed or opens same, wherein a detent mechanism (6) is provided, with a rotary latch (1) which, when the motor vehicle door is closed, is connected in an interlocking manner to the striker (2), with a pawl (3) which blocks the rotary latch (1) in a pre-latching position or a main latching position when the motor vehicle door is closed, with an assembly consisting of a pivotable intermediate lever (4) and the pawl (3) mounted pivotably thereon blocks the rotary latch (1) in a pre-latching position or a main latching position when the motor vehicle door is closed, characterized in that, when the motor vehicle door is closed, the rotary latch (1) loads the pawl (3) in the closing direction, but also loads the assembly consisting of intermediate lever (4) and pawl (3) in the opening direction.
15. Motor vehicle lock according to Claim 14, characterized by a detent mechanism according to one of Claims 1 to 13.

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