EP4127369A1

EP4127369A1 - Bonnet lock positive driving of pawl by rotary latch with double lift

Info

Publication number: EP4127369A1
Application number: EP21719038.8A
Authority: EP
Inventors: Elena SUHOLUTSKAJA
Original assignee: Kiekert AG
Current assignee: Kiekert AG
Priority date: 2020-03-25
Filing date: 2021-02-15
Publication date: 2023-02-08
Also published as: JP2023518879A; DE112021001831A5; WO2021190684A1; DE102020108310A1

Abstract

The invention relates to a motor vehicle lock, and in particular a motor vehicle bonnet lock, which is equipped with a locking mechanism (1, 2) consisting of a rotary latch (1) and at least one pawl (2). In addition, a release lever (4) is realized for the pawl (2). The pawl (2) is equipped with at least a first blocking tooth (2a) and a second blocking tooth (2b). The rotary latch (1) has at least one preliminary detent (11b) and a main detent (11a). According to the invention, the pawl (2), which is lifted by its first blocking tooth (2a) off the main detent (11a) of the rotary latch (1) by means of the release lever (4) for unlocking, has its second blocking tooth (2b) interacting with the main detent (11a) of the rotary latch (1) for positively guiding the pawl (2) and blocking the preliminary detent (11b) of the rotary latch (1).

Description

description

HOOD LOCK FORCED OPERATION OF THE LOCKING LOCK DUE TO THE ROTARY LATCH AT DOUBLE STROKE

The invention relates to a motor vehicle lock, in particular a motor vehicle hood lock, with a locking mechanism consisting of a rotary latch and at least one pawl, and with a release lever for the pawl, the pawl being equipped with at least a first ratchet tooth and a second ratchet tooth, and wherein the rotary latch has at least one preliminary detent and one main detent.

Motor vehicle locks and in particular motor vehicle hood locks are typically used to close a motor vehicle hood or also a motor vehicle flap, for example a motor vehicle front hood or a motor vehicle tailgate. Of course, such motor vehicle fitters are not restricted to such areas of application. An example of such a motor vehicle lock is described in DE 10 2014201 808 A1 by the applicant.

In the case of motor vehicle hood locks and in particular motor vehicle front hood locks, the relevant motor vehicle lock is generally opened with the aid of an actuating device ending in the interior of the associated motor vehicle. This can, for example, work manually via a linkage or a Bowden cable on the release lever and ensure the unlocking or opening of the motor vehicle lock. For this purpose, the actuating device may be a handle or a loop for manual actuation. In principle, however, a switch for the electrical application of the release lever can also be actuated.

Motor vehicle hood locks can in principle be opened in this way, but are only opened by spring force and for safety reasons put up a crack. This is necessary in order, for example, to prevent the motor vehicle front hood from being completely swung open if the actuating device is operated incorrectly while driving. The complete opening of the motor vehicle wing from this gap position usually takes place with the aid of a catch lever which, for this purpose, has to be pivoted by an operator while the associated motor vehicle is at a standstill, so that the wing is finally released. In this case, in the open position of the locking mechanism, the catch lever engages around or over the locking bolt attached to the motor vehicle front hood. For this purpose, the catch lever typically interacts with a locking bolt attached to the front hood of the motor vehicle.

Such a catch lever and the associated mechanics are unnecessary if it is ensured or can be ensured during the unlocking of the motor vehicle lock in question that, for example, the locking position of the locking mechanism is reliably assumed by the unlocking. The opening then takes place, for example following this, in that the pawl can be manually pivoted out of this pre-latching position on the rotary latch and the motor vehicle front hood can be opened as a result. However, that assumes the safe assumption of the pre-locking position. There are currently no reliable approaches in the prior art.

It is true that the motor vehicle lock forming the genus works according to DE 10 2006 052 773 A1 already with a pawl that has a support point as the first ratchet tooth and also a locking point as the second ratchet tooth of the pawl. In the end, however, it is a matter of detecting a radial distance between the preliminary detent and the flattened detent of the axis of rotation via a sensor and, as a function of this, to apply a closing aid. However, this prior art has not been able to make any contribution to the approaches described above.

Accordingly, the present invention is based on the technical problem of developing such a motor vehicle lock so that in the course of the Unlocking the pre-latching position is safely assumed.

To solve this technical problem, a generic motor vehicle lock and in particular a motor vehicle hood lock is characterized within the scope of the invention in that the pawl, with its second ratchet tooth, lifted off the main catch of the rotary latch with its first ratchet tooth with the aid of the release lever for unlocking Rotary latch interacts with the forced guidance of the pawl and blocking the preliminary catch of the rotary latch during the opening process of the locking mechanism.

In the context of the invention, in order to unlock the motor vehicle lock and safely assume the pre-latching position, the pawl is first lifted off the rotary latch with the aid of the release lever. For this purpose, the first ratchet tooth of the pawl is removed or lifted off the main catch of the rotary latch in detail. As a result, the rotary latch is initially free and swivels (spring-assisted) in its opening direction. As a result, the main ratchet of the rotary latch can interact with the second ratchet tooth of the pawl. According to the invention, the pawl is forced to operate, which is typically pivoted in the direction of the rotary latch during this process, so that the pawl can properly block the preliminary detent of the rotary latch or interacts with the preliminary detent of the rotary latch during the further opening movement of the rotary latch. The blocking of the preliminary catch of the rotary latch is advantageously carried out with the aid of the first ratchet tooth.

In fact, the forced guidance of the pawl by the main catch of the rotary latch that swings open in the opening direction ensures that the pawl with its first ratchet tooth is pivoted in the direction of contact with the rotary latch by the main catch of the opening rotary latch moving against the second ratchet tooth of the pawl. As a result of this, the first ratchet can now block the preliminary catch of the opening rotary latch. The positive guidance of the pawl through the interaction with the main notch of the opening rotary latch ensures that the pawl always faces up the rotary latch is pivoted so that the first ratchet tooth interacts with the preliminary catch of the rotary latch during this opening process and the rotary latch is effectively blocked as a result. It is therefore ensured in any case that the rotary latch in the motor vehicle lock according to the invention cannot fundamentally open completely, but instead initially and forcibly changes from the main locking position to the pre-locking position. As a result, the motor vehicle lock can then - as described - be opened manually, starting from the pre-latching position, by pivoting the pawl (again). This is where the main advantages can be seen.

According to an advantageous embodiment, the first catch of the rotary latch is blocked in the course of unlocking with the aid of the first ratchet tooth of the pawl. This is possible because through the positive guidance of the pawl through the mutual interaction of the second ratchet with the main ratchet, the first ratchet tooth of the ratchet is pivoted in the direction of the rotary latch, so that the opening rotary latch automatically during this process with its preliminary ratchet against the first ratchet in question the pawl moves and is blocked as a result.

According to a further advantageous embodiment, the preliminary detent and the main detent of the rotary latch are each designed as a preliminary detent tooth or main detent tooth. It is consequently not a pre-locking recess or main locking recess, but rather a pre-locking tooth and a main locking tooth, consequently a tooth-like elevation on the outer circumference of the rotary latch.

The rotary latch is usually equipped with a catch arm and a load arm, as is customary for rotary latches in motor vehicle hood locks. The two ratchet teeth are generally arranged adjacent to the load arm on the outer circumference of the rotary latch. As a result of this, the two locking teeth arranged exposed on the outer circumference of the rotary latch can easily interact with the respective locking tooth of the locking pawl as described.

In fact, at this point the design is advantageously made so that the first ratchet is arranged on the front of the pawl. In contrast, the second ratchet tooth is arranged such that it is designed as a projection offset in the direction of an axis of the ratchet pawl relative to the first ratchet tooth. That is, starting from the first ratchet tooth on the front side of the ratchet pawl, the second ratchet tooth follows in the direction of the axis of the ratchet pawl, specifically as a projection offset with respect to the first ratchet tooth.

In addition, the pawl is usually equipped with a stop for interaction with the release lever. The stop is usually a further projection offset on the second ratchet tooth in the direction of the axis. In other words, starting from the first ratchet tooth, the pawl has a stepped design in the direction of its axis such that the first ratchet tooth is followed by the second ratchet tooth as a projection and the stop follows the second ratchet tooth as a further projection.

In this context, the design is also made such that the stop on the pawl is engaged from behind by a nose of the release lever. As a result, a pivoting movement of the release lever in the direction of unlocking or opening the motor vehicle lock means that the mostly radially arranged and extending nose of the release lever engages behind the stop on the pawl and thereby pivots the pawl so that it releases the rotary latch as described.

As a result, a motor vehicle lock is made available which is particularly suitable as a motor vehicle hood lock and is predestined for this. Because a first actuation of the release lever to unlock the motor vehicle lock in question leads to the locking pawl being positively guided with the help of the rotary latch and the locking mechanism as a whole and as a result of the forced guidance being able to assume the mandatory pre-locking position. Only in the course of a second actuation of the release lever, for example, can the pawl be lifted off the rotary latch so that it is in its entirety the open position.

As a result, the inevitable pre-locking position can be used, for example, to move the motor vehicle front hood equipped with the motor vehicle lock in question into the gap position already described above, so that the second actuation of the release lever enables the motor vehicle front hood to be completely opened. In other words, a double-stroke actuation of the release lever is ultimately required to open the motor vehicle lock. This is where the main advantages can be seen.

The invention is explained in more detail below with the aid of a drawing showing only one exemplary embodiment; show it:

Fig. 1 shows the motor vehicle lock according to the invention in

Starting position in his flauptrast position,

Figures 2A to 2C the unlocking of the lock and the forced operation of the

Pawl in the direction of the pre-locking position of the locking mechanism and

Fig. 3 the pre-locking position assumed at the end in the course of

Unlocking.

In the figures, a motor vehicle lock is shown, which is not restrictively a motor vehicle leaf lock, preferably a motor vehicle front hood lock. This has a locking mechanism 1, 2 consisting of a rotary latch 1 and a pawl 2. The figures show that the rotary latch 1 is equipped with a catch arm 1 a and a load arm 1 b, with an insertion slot between them for one in the figures define only indicated locking bolt 3, which is connected according to the embodiment to the motor vehicle front hood, which is not expressly shown. The basic structure also includes a release lever 4, which, starting from the main detent position in FIG. 1, must be pivoted clockwise about its axis 5 in order to unlock or open the locking mechanism 1, 2, as will be explained in more detail below. The clockwise movement of the release lever 4 about its axis 5 may be brought about by an actuating device 6, indicated only in FIG.

It can be seen that the pawl 2 is equipped with at least one first ratchet tooth 2a and a second ratchet tooth 2b. In addition, the pawl 2 also has a stop 7. The stop 7 on the pawl 2 is engaged from behind by a nose 8 on the release lever 4. As a result, the already mentioned action of the actuating lever 4 around its axis 5 in a clockwise direction causes the actuating lever 4 to move with its nose 8 against the stop 7 of the pawl 2 and this counterclockwise around its during such an unlocking or opening process of the locking mechanism 1, 2 Axis 9 is pivoted, as shown in particular in FIGS. 2A to 2C to be described below.

As a result, the rotary latch 1 is initially at least partially free and can rotate about its axis 10 in the indicated counterclockwise direction. This is ensured in particular by door rubber sealing forces or other spring forces which are introduced into the rotary latch 1 via the locking bolt 3 and which pretension it about its axis 10 in the counterclockwise direction of the opening movement.

The rotary latch 1 is also equipped with a preliminary catch 11 b and a main catch 11 a. The figures show that the preliminary ratchet 11 b as well as the main ratchet 11 a are each ratchet teeth 11 a, 11 b, namely a preliminary ratchet tooth 11 b and a main ratchet tooth 11 a. Besides, they are two ratchet teeth 11 a, 11 b then arranged on the load arm 1 b of the rotary latch 1 on the outer circumference of the rotary latch 1. As a result, a pivoting movement of the rotary latch 1 about its axis 10 to open it counterclockwise results in the main ratchet tooth 11a and then the pre-ratchet tooth 11b interacting with the pawl 2, as will be explained in more detail below.

In fact, according to the invention, the design is such that the pawl 2 is lifted off the main detent or main detent tooth 11a of the rotary latch 1 with the aid of the release lever 4 to unlock the locking mechanism 1, 2, with its first locking tooth 2a. That is to say, in the main ratchet position shown in FIG. 1, the first ratchet tooth 2a of the pawl 2 rests on the main ratchet tooth 11a of the rotary latch 1.

As soon as the pawl 2 with its first ratchet tooth 2a has been lifted from the main ratchet or the main ratchet tooth 11 a of the rotary latch 1 with the aid of the release lever 4 to unlock the locking mechanism 1, 2, the ratchet 2 with its second ratchet tooth 2b with the main ratchet or interact with the main ratchet tooth 11 a of the rotary latch 1 (cf. FIG. 2A). This results in a forced guidance of the pawl 2, as shown in particular in Figures 2B and 2C. Following this, the preliminary catch 11 b of the rotary latch 1 or the preliminary ratchet tooth 11 b of the rotary latch 1 is blocked, as the end position in FIG. 3 shows. That is, the pre-catch or the pre-catch tooth 11 b of the rotary latch 1 is blocked in the course of unlocking with the aid of the first ratchet tooth 2a of the pawl 2 at the end of the unlocking process described and following the illustration in Figure 3, as explained in more detail below will.

For this purpose, the first ratchet tooth 2a of the pawl 2 is arranged on the front. The second ratchet 2b of the pawl 2 is designed in the direction of the axis 9 of the pawl 2 as an offset projection with respect to the first ratchet 2a. The already mentioned stop 7 on the pawl 2 for interaction with the release lever 4 is as a further and on the second ratchet 2b in the direction the said axis 9 carried out offset projection. As a result, the first ratchet tooth 2a provided on the front side of the ratchet 2 is followed in a stepped and cascade-like manner in the direction of the axis 9 of the ratchet 2 with the second ratchet tooth 2b as the first projection and then the stop 7 as a further projection with respect to the second ratchet tooth 2b.

The way it works is as follows. In the figure 1, the locking mechanism 1, 2 is shown in the main locking position. Here, the main ratchet tooth 11 a of the rotary latch 1 rests on the first ratchet tooth 2a of the pawl 2. If the locking mechanism 1, 2 is now to be unlocked starting from the main locking position in FIG. 1, this corresponds to the fact that the actuating lever 4 is pivoted clockwise about its axis 5. Corresponding to this is an impact on the part of the actuating device 6 in accordance with the exemplary embodiment, as can be seen in the transition from FIG. 1 to FIG. 2A.

As a result of this, the nose 8 on the release lever 4 moves against the projection 7 of the pawl 2 and ensures that the pawl 2 in the counterclockwise direction indicated there by the clockwise rotation of the release lever 4 around its axis 5 in the transition from Figure 1 to Figure 2A Axis 9 is pivoted. As a result, the first ratchet tooth 2a comes free from the main ratchet tooth 11a of the rotary latch 1. The rotary latch 1 can then open (slightly) counterclockwise about its axis 10, as indicated in FIG. 2A.

This opening movement of the rotary latch 1 is limited or the rotary latch 1 is blocked because the main ratchet tooth 11a of the rotary latch 1 moves against the second ratchet tooth 2b of the pawl 2 during this process. This is shown in Figure 2B. The actuating lever 4 is here acted upon unchanged with the aid of the actuating device 6.

As a result of the interaction of the main ratchet tooth 11 a of the rotary latch 1 with the second ratchet 2b of the pawl 2, the pawl 2 is now forced to move, in the transition from Figure 2B to Figure 2C in the sense that the pawl 2 is now acted counterclockwise counterclockwise against its opening direction. That is, the pawl 2 ensures with its second ratchet tooth 2b through its interaction with the Flauptrast or the Flauptrastzahn 11 a of the rotary latch 1 for the forced guidance of the pawl 2 and finally for the blocking of the preliminary ratchet or the preliminary ratchet tooth 11 b of the rotary latch 1, as shown in the end position according to FIG.

Before that, however, the Flauptrastzahn 11a of the rotary latch 1 moving counterclockwise about its axis 10 ensures that the pawl 2 is positively guided because the Flauptrastzahn 11a moves against the second ratchet tooth 2b of the pawl 2 during this process and thereby the pawl 2 in Is pivoted clockwise about its axis 9. This can be seen in the transition from FIG. 2B to FIG. 2C.

Following the functional position in Figure 2C, the rotary latch 1 rotates counterclockwise in its opening direction around its axis 10 a little further until the pawl 2 moves with its first ratchet tooth 2a against the ratchet tooth 11b of the rotary latch 1. As a result, the rotary latch 1 is blocked following the described positive guidance of the pawl 2, specifically with its preliminary detent or its preliminary detent tooth 11 b. This can be attributed to the fact that the forced guidance of the pawl 2 swivels the pawl 2 clockwise about its axis 9 and thereby the first ratchet tooth 2a of the pawl 2 is pivoted into contact with the rotary latch 1, namely in contact with an intermediate area 11 c between the two ratchet teeth 11 a and 11 b.

At the end of this process, the pre-ratchet tooth 11 b of the rotary latch 1 has moved against the first ratchet tooth 2a of the pawl 2. The locking bolt 3 flies through the transition from FIG. 1 to FIG. 3 and with it the The associated motor vehicle front hood has been opened slightly (by gaps). If, starting from this gap position in FIG. 3, the release lever 4 opens again with the aid of the actuating device 6 in the sense of a second and consequently double stroke in the direction, ie is acted upon in a clockwise direction about its axis 5, this ensures a counterclockwise rotation of the

Locking pawl 2 and the rotary latch 1 is completely released by the locking pawl 2. As a result, the front hood with the locking bolt 3 connected to it can leave the locking mechanism 1, 2. The motor vehicle lock is fully open.

List of reference symbols

1 rotary latch

1a catch arm 1b load arm 1, 2 ratchet 2 pawl

2a first ratchet

2b second ratchet 3 locking bolts

4 release levers / operating levers

5 axis

6 actuating device 7 stop / projection 8 nose

9 axis

10 axis 11a main detent 11b preliminary detent 11c intermediate area

Claims

1. Motor vehicle lock, in particular motor vehicle hood lock, with a locking mechanism (1, 2) consisting of a rotary latch (1) and at least one pawl (2), and with a release lever (4) for the pawl (2), the pawl (2) is equipped with at least one first ratchet tooth (2a) and a second ratchet tooth (2b), and wherein the rotary latch (1) has at least one preliminary catch (11 b) and one main catch (11 a), characterized in that the using the release lever (4) for unlocking the main catch (11 a) of the rotary latch (1) with its first ratchet tooth (2a) lifted pawl (2) with its second ratchet tooth (2b) with the main catch (11a) of the rotary latch for forced guidance of the pawl (2) and blocking of the preliminary catch (11 b) of the rotary latch (1) interacts during the opening process of the locking mechanism (1, 2).

2. Motor vehicle lock according to claim 1, characterized in that the preliminary catch (11 b) of the rotary latch (1) is blocked in the course of unlocking with the aid of the first ratchet tooth (2a) of the pawl (2).

3. Motor vehicle lock according to claim 1 or 2, characterized in that the preliminary ratchet (11 b) and the main ratchet (11 a) of the rotary latch (1) are each designed as a preliminary ratchet tooth (11 b) or main ratchet tooth (11 a).

4. Motor vehicle lock according to one of claims 1 to 3, characterized in that the first ratchet tooth (2a) is arranged on the front side of the pawl (2).

5. Motor vehicle lock according to one of claims 1 to 4, characterized in that the second ratchet tooth (2b) is designed as a projection relative to the first ratchet tooth (2a) offset in the direction of an axis (9) of the pawl (2).

6. Motor vehicle lock according to one of claims 1 to 5, characterized in that the pawl (2) additionally has a stop (7) for interaction with the release lever (4).

7. Motor vehicle lock according to claim 6, characterized in that the stop (7) is designed as a projection offset on the second ratchet tooth (2b) in the direction of the axis (9).

8. Motor vehicle lock according to claim 6 or 7, characterized in that the stop (7) on the pawl (2) is engaged from behind by a nose (8) of the release lever (4).

9. Motor vehicle lock according to one of claims 1 to 8, characterized in that the rotary latch (1) has a catch arm (1 a) and a load arm

(1 b).

10. Motor vehicle lock according to claim 9, characterized in that the two locking teeth (11a, 11b) are then arranged on the load arm (1b) on the outer circumference of the rotary latch (1).