Patent Application
20220003023
The invention relates to a motor vehicle lock, in particular a motor vehicle door lock, which has a locking mechanism consisting of a rotary latch and at least one pawl, wherein the pawl exerts an opening torque on the rotary latch, wherein the pawl further has an arched contact region, which interacts with a latching contour of the rotary latch, and wherein the contact region of the pawl has a first arch portion and a second arch portion, each having different radiuses.
The aforementioned motor vehicle locks are not restricted to motor vehicle door locks. Basically, tailgate locks, front hood locks, tank flap locks, loading flap locks, etc. can also be meant at this point and are also included in the invention.
With such motor vehicle locks and in particular motor vehicle door locks, the state of the art according to WO 2013/163982 A2 proceeds in such a way that the rotary latch introduces a torque into the pawl, in particular an opening torque. In this way, the opening operation of the associated locking mechanism is supported based on the rotary latch and the pawl. This is particularly helpful when, for example, a tailgate or front hood is to be opened so far that an operator can reach behind a gap in order to open the hood or tailgate in question. The same applies, of course, when a motor vehicle side door is to be opened.
For reasons of convenient opening and in particular to implement a low-noise locking mechanism, a two-pawl or multi-pawl locking mechanism is often used, as described in the scope of DE 10 2013 103 245 A1 by the applicant. A convenience pawl and a locking pawl are implemented here. The convenience pawl is blocked with the aid of the pawl and in turn ensures that the rotary latch assumes and maintains its closed position or latching position. This has proven itself in principle.
In the generic state of the art according to DE 20 2009 019 025 U1, the pawl there is not only used to lock the rotary latch in the pre-ratchet and the main ratchet. Rather, in the pre-locking position, the pawl has a closing torque that acts on the rotary latch. In addition, the contour or the contact region of the pawl is also designed in such a way that the pawl exerts an opening torque on the rotary latch in the main locking position.
In detail, a flat contour region is implemented on the pawl, which causes a latching in the pre-ratchet. In contrast, a different contour region is provided on the pawl for the main ratchet. In this way, it should be possible overall to provide the pre-ratchet position on the same locking level as the main ratchet position. A comparable locking mechanism for a lock of a motor vehicle is presented and described in DE 10 2009 029 031 A1.
The state of the art mentioned and previously acknowledged is not free from defects. Because if the pawl exerts an opening torque on the rotary latch, this opening torque is only made available, for example, during the opening of the locking mechanism. As a result, situations are possible in practice which lead to the opening torque of the pawl having a reduced effect or no effect at all on the rotary latch. This applies, for example, to the case that there is dirt between the arched contact region on the pawl and the latching contour of the rotary latch in the closed position of the locking mechanism or, for example, as a result of a long downtime, increased holding forces due to moisture, corrosion etc. As a result of this, the associated motor vehicle lock can no longer be opened properly, in particular opened electrically, under certain circumstances. In addition, the closing operation is also impaired by any dirt or dust in this region. The invention as a whole seeks to remedy this.
The invention is based on the technical problem of further developing such a motor vehicle lock and in particular a motor vehicle door lock in such a way that the functionality is improved and, in particular, a secure collapse when closing as well as a perfect opening are ensured.
To solve this technical problem, the invention proposes in a generic motor vehicle lock and in particular in a motor vehicle door lock that the first arch portion of the contact region of the pawl has a larger radius in the closing direction of the locking mechanism than the second following arch portion with the radius there.
This dimensioning rule first of all ensures that the first arch portion with the larger radius in the closing direction of the locking mechanism has a large so-called “pre-cut.” In fact, according to the explanations in DE 10 2013 103 245 already mentioned and referred to, the pre-cut expresses how large the opening torque of the pawl is designed for the rotary latch. Since the first arch portion of the contact region of the pawl with the latching contour of the rotary latch has a larger radius than the second following arch portion, this also corresponds to a higher torque exerted by the pawl on the rotary latch during an opening operation than in the second arch portion. In this way, any contamination or holding forces that may be present in the contact region of the pawl with the latching contour of the rotary latch can on the one hand be easily overcome. On the other hand, these increased torques may be associated with increased forces when opening the locking mechanism, as will be explained in detail below.
Since the second arch portion following the first arch portion in the closing direction of the locking mechanism is equipped with the smaller radius in comparison, a reduced torque or opening torque of the pawl is observed with increasing closed position, particularly in the closed position of the locking mechanism. This is advantageous in that it ensures that the pawl can securely collapse into the latching contour of the rotary latch during the closing operation of the locking mechanism, without the still existing opening torque or opening torque of the pawl preventing or making this difficult. Herein lie the essential advantages.
According to an advantageous embodiment, the two arch portions in the contact region of the pawl are arranged and designed in such a way that they directly adjoin one another in the closing direction of the locking mechanism. In other words, in the closing direction of the locking mechanism, the latching contour of the rotary latch first strike the first arch portion with the larger radius and consequently the higher opening torque of the pawl and then the second arch portion with the smaller radius and lower opening torque until the closed position of the locking mechanism is reached. As a result, the pawl can fall securely into the latching contour of the rotary latch and thus a secure collapse when closing is ensured. In this context, the two adjoining arch portions ensure that the pre-cut, i.e. the opening torque exerted by the pawl on the rotary latch, is designed to be variable, namely in such a way that the opening torque decreases in the closing direction of the locking mechanism.
In order to achieve this in detail, the two arch portions are also equipped with different arch lengths. In fact, the first arch portion regularly has a larger arch length than the second arch portion. Here, arch lengths for the first arch portion of 8 mm and more have proven to be particularly favorable. In contrast, the second arch portion is equipped with an arch length of 5 mm and less.
In addition, the design is usually such that the first arch portion in the closing direction of the locking mechanism is adapted to the latching contour of the rotary latch in the contact region of the pawl. For this purpose, the design is such that the first arch portion of the pawl in question overlaps a specific arch length with an associated arched contour region of the latching contour of the rotary latch. As a result of this overlap, the region of the first arch portion of the contact region of the pawl becomes less sensitive to dust, dirt, or any holding forces.
The pawl of the motor vehicle lock according to the invention is generally a convenience pawl which, together with an additionally provided pawl and the rotary latch, defines a two-pawl locking mechanism or multi-pawl locking mechanism. In other words, the two arch portions and consequently the contact region of the pawl are each arranged on the convenience pawl. In addition, the design is usually made such that the second arch portion of the convenience pawl is adapted to an arched abutment region of the locking pawl for the convenience pawl.
In other words, in the closed position of the locking mechanism, the pawl with its arched abutment region ensures that the convenience pawl is held securely in engagement with the latching contour of the rotary latch and cannot pivot open in the opening direction. In fact, the convenience pawl is mostly equipped with a spring which acts on the convenience pawl in an opening direction and also ensures that the opening torque described above is applied to the rotary latch via the first arch portion and the second arch portion.
By adapting the second arch portion of the convenience pawl to the arched abutment region of the pawl for the convenience pawl, the invention ensures that, in the closed position of the locking mechanism, the opening torque exerted by the convenience pawl on the rotary latch corresponds approximately to the closing torque that the pawl securing the convenience pawl exerts over its arched abutment region onto the convenience pawl. As a result, the convenience pawl is held securely in place on the latching contour of the rotary latch. At the same time, the pawl can easily be pivoted away from the convenience pawl during an opening operation, which then releases the rotary latch. In other words, in the closed position of the locking mechanism, there is largely an overlap of the radiuses of the arched abutment region of the pawl on the one hand and the second arch portion of the convenience pawl on the other hand. For example, the radius of the second arch portion of the convenience pawl can substantially correspond to the radius of the abutment region of the locking pawl.
As a result, the pawl can be lifted out with relatively little effort and releases the convenience pawl during the opening operation of the locking mechanism. The convenience pawl, in turn, swings open, supported by the force of the spring, and supports the opening movement of the rotary latch due to the opening torque increasing in the opening direction of the locking mechanism. Conversely, in the closing direction of the locking mechanism, the variable design of the pre-cut ensures that the opening torque exerted by the convenience pawl on the locking pawl is reduced in the closing direction of the locking mechanism, so that a secure collapse of the convenience pawl into the rotary latch is provided when closing the locking mechanism. In this way, the functionality is significantly improved overall compared to the state of the art. Herein lie the essential advantages.
The invention is explained in greater detail below with reference to drawings, which show only one exemplary embodiment. In the drawings:
The drawings show a motor vehicle lock which, in the exemplary embodiment, is a motor vehicle door lock and in particular a motor vehicle side door lock. This motor vehicle lock has a locking mechanism 1, 2, 3, which is composed of a rotary latch 1 and two pawls 2, 3. The first pawl 2 is designed as a convenience pawl, while the further second pawl 3 is or can be designed as a second pawl or blocking pawl that secures the convenience pawl 2 in the closed position.
In
In
The convenience pawl 2 is equipped with an arched contact region 8, 9. In the closed position of the locking mechanism 1, 2, 3, as shown in
According to the invention, the first arch portion 8, which first interacts with the latching contour 10 of the rotary latch 1 in the closing direction S of the locking mechanism 1, 2, 3, has a larger radius or first radius R1 than the second subsequentially following arch portion 9, whose associated additional radius R2 on the other hand is dimensioned smaller relative thereto.
In other words, the following applies:
R1>R2.
In addition, it can be seen in particular from a comparative consideration of
The first arch portion 8 is adapted to the latching contour 10 of the rotary latch 1, as can be seen in particular in
In contrast, the second arch portion 9 on the convenience pawl 2 is adapted to an arched abutment region 12 of the locking pawl 3. In fact, the radius R2 of the second arch portion 9 on the convenience pawl 2 substantially corresponds to the associated radius R3 of the abutment region 12 of the pawl 3, which moves against the convenience pawl 2 in the closed position of the locking mechanism 1, 2, 3 shown in
Based on a comparison of
M1>M2.
As a result, a variable pre-cut is made available overall on the convenience pawl 2, namely initially a large pre-cut or a large opening torque M1 in the closing direction S of the locking mechanism 1, 2, 3 and immediately thereafter a smaller pre-cut and, associated therewith, a smaller opening torque M2.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2018 125 641.8 | Oct 2018 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/DE2019/100835 | 9/24/2019 | WO | 00 |
