WO2020259749A1

WO2020259749A1 - Door lock, in particular motor vehicle door lock

Info

Publication number: WO2020259749A1
Application number: PCT/DE2020/100491
Authority: WO
Inventors: Madhu Basavarajappa
Original assignee: Kiekert Ag
Priority date: 2019-06-25
Filing date: 2020-06-15
Publication date: 2020-12-30
Also published as: DE102019117054A1; EP4013930B1; EP4013930A1

Abstract

The invention relates to a door lock, in particular a motor vehicle door lock, which is provided with a locking mechanism (1, 2) consisting of a rotary latch (1) and at least one pawl (2). In addition, at least one damping means (6) is created between two components (1, 2) of the locking mechanism, which acts in a noise-damping manner via the deformation thereof at least with the closing interaction between the locking mechanism components. The damping means (6) is provided at the edge of at least one stop face (4) on the rotary latch (1) and/or the pawl (2). In addition, the damping means (6) has a determined height (H) in relation to the associated stop face (4). According to the invention, the damping means (6) is provided with a cavity (9) which is compressed with the closing contact between the two locking mechanism components (1, 2).

Description

description

Door lock, in particular motor vehicle door lock

The invention relates to a door lock, in particular a motor vehicle door lock, with a locking mechanism consisting of a rotary latch and at least one pawl, and with at least one damping means between two locking components, which at least when they interact with each other has a noise-damping effect due to its deformation, with the damping means at the edge of at least one stop surface the rotary latch and / or the pawl is provided, and wherein the damping means has a certain height with respect to the associated stop surface.

Door locks and, in particular, motor vehicle door locks are typically equipped with a so-called single lock consisting of a rotary latch and a pawl securing the rotary latch. In the context of the present application, however, multiple ratchets or multi-ratchet ratchets are also considered, ie those that are equipped with a rotary latch and, for example, two ratchet pawls, a comfort pawl and a blocking pawl securing the comfort pawl.

With such door locks and in particular the associated locking mechanism, more or less pronounced “metallic” noises often occur, particularly during the locking process of the locking mechanism. These can be traced back to the fact that the pawl falling into the rotary latch, ie both of the aforementioned locking components, are each equipped with a metallic stop surface for security reasons in order to achieve the associated pre-locking position or main locking position. A comparable metallic contact with corresponding acoustic noises can in principle also occur between the previously mentioned comfort pawl and the blocking pawl securing the comfort pawl and is here under Observed under certain circumstances, but is mostly negligible in practice. For this reason, the present application concentrates on single locks, although the teaching described is not reduced to this, but can also be used in principle with multiple locks or multi-ratchet locks.

In the prior art, there are already various approaches to positively influence the noise development mentioned above. In fact, DE 102 01 367 B4 or DE 102 16 313 A1 work with a damping means or a damping layer at contact points of the rotary latch where a locking bolt or a pawl come to rest. For this purpose and to avoid impact noises, recesses are provided in a damping layer on the surface of the rotary latch. The recesses are filled with an elastic damping material, the elasticity of which can be adapted to the respective impact mass. In this context, outwardly projecting thickenings are also addressed, which increase the cross section of a damping membrane.

A rotary latch or fork latch with a casing made of a damping material is also described in DE 23 20 351. The sheathing made of the damping material is equipped with additional buffer designs in the form of spring mechanism chambers and bridging projections at the contact points between the fork latch and the locking bolt or the rotary latch and the pawl.

In the generic prior art according to EP 1 500 762 B1, the procedure for a motor vehicle door lock is that the damping means is implemented on the edge of at least one stop surface on the rotary latch and / or pawl. In addition, the damping means has a certain amount of fleas in relation to the associated stop surface. The damping means is, for example, web-like or wedge-like in cross section. Through the The arrangement of the damping means selected on the edge of the stop surface achieves particularly effective damping because this causes the opposite stop surface or counter-stop surface to first move against the damping means and then the stop surface. This has basically proven itself.

The prior art, however, needs to be improved insofar as in the known teaching according to EP 1 500 762 B1 the effective deformation path of the damping means implemented on the edge is relatively small. In connection with inevitable signs of aging, this leads to the fact that, particularly on long time scales and when hardening of the damping means, which is mostly made of plastic, is observed, for example, its effectiveness decreases compared to when it is new. This is where the invention comes in.

The invention is based on the technical problem of further developing such a door lock, and in particular a motor vehicle door lock, in such a way that the effectiveness of the damping means is once again improved compared to the prior art, also and in particular on long time scales.

To solve this technical problem, the invention proposes in a generic door lock and in particular a motor vehicle door lock that the damping means be equipped with a cavity which is compressed when the locking components make contact.

This means that the cavity extends largely at an angle and mostly even at right angles to the closing direction between the two locking components, so that during a closing process and the resulting closing contact between the locking components, the largely transverse cavity is compressed as desired. By making use of the cavity, the damping means as a whole can be equipped with a significant height compared to the associated stop surface, which in any case is that of the damping means according to the prior art according to E 1 500 762 B1 more or less clearly exceeds. In fact, the prior art speaks in this context of a height of the damping means in relation to the associated stop surface which is between 0.1 and 1 mm. In contrast, by using the cavity, the invention allows heights or structural heights with respect to the stop surface, which as a rule more or less clearly exceed 1 mm.

Such a design is possible because during a closing process and consequently when the stop surface and the counter-stop surface approach the interacting locking components, the cavity is first compressed until its defining walls or longitudinal walls lie on top of one another. The damping means is then intrinsically compressed as such.

In this way, the invention can ultimately work with two different spring constants of the elastic damping for the damping means used. First of all, the compression of the cavity at the beginning of the closing process corresponds to a low spring constant, because the damping means, which are usually made of plastic, are mainly macroscopically deformed. However, if the cavity has disappeared due to compression and accordingly the longitudinal walls defining the cavity lie one on top of the other, a further and mostly larger or significantly larger spring constant is observed. Because now the damping means typically opposes microscopic deformation forces in the material of the movement to the further closing movement. As a result, a slight damping is observed at the beginning of the closing movement, which becomes greater and greater as the closing movement increases. As a consequence of this, a particularly effective noise damping is realized according to the invention.

All of this succeeds in combination with space-saving and effective damping in such a way that the damping means is arranged on the edge of the stop surface. That is, the stop surface as such is determined in terms of its size and their metallic character, which is still present, is not or at least slightly influenced. This is where the main advantages can be seen.

According to an advantageous embodiment, the cavity is designed in the shape of a lens. In addition, the cavity mostly has a length which is adapted to a longitudinal extent of a counter stop moving against the stop surface.

The longitudinal extent of the stop surface and the counter-stop surface usually correspond, so that the cavity can be easily adapted to the relevant longitudinal extent. With this topological design, the invention ensures that during a closing process between the two locking components, the counter-stop surface moving against the stop surface compresses the cavity, which is adapted to the length of its longitudinal extension, practically over its entire length in the first region of the travel path. In the second part of the travel path, the longitudinal walls delimiting the cavity ensure, through their mutual abutment, that the plastic mostly used for the damping means is intramolecularly elastically deformed during this second travel path, as already described above.

It has proven useful if the damping means is arranged in the region of a recess in the stop surface. The design is usually made in such a way that the recess of the stop surface merges in the direction of a locking component axis into a recess in the metallic core of the locking component. That is, the recess of the stop surface for receiving and defining the damping means is not (only) designed to be flat, but also has a spatial character, because the recess merges into the previously mentioned recess in the direction of the locking component axis. In this way, the plastic, which is generally used as a material for the damping means, is connected particularly effectively and over a large area to a metallic core of the locking component. In addition, the recess ensures that the plastic can be deformed first macroscopically and then microscopically particularly effectively, namely intramolecularly. The anchoring of the damping means in the depression is also favorably influenced in the event that the depression opens conically in the direction of the recess. What is achieved thereby is that the plastic defining the damping means is, as it were, wedged within the depression. The constricting effect increases due to the conicity in the closing direction of the locking components.

This is important insofar as, particularly in the case of intramolecular deformation of the plastic during the closing process, such a plastic typically tends to "expand" or to become convex or barrel-shaped. In order to counteract such a deformation, the depression opens in the direction of the recess or, conversely, the plastic is increasingly wedged in the depression in the closing direction and this deformation of the plastic is counteracted accordingly.

The recess is therefore primarily used to anchor the damping means. In addition, the depression counteracts any and possibly permanent deformations of the damping means due to the application of force during the closing process.

As already explained, the stop surface having the damping means on the edge is equipped with the recess. In order to compensate for the associated loss of surface area at this point, a bulge or bulge is moreover usually implemented on an edge of the stop surface opposite the recess. This bulge in the metallic core of the locking component also goes advantageously in the direction of the locking component axis in a thickening in the metallic core of the Locking component over. Due to the recess and also the bulge or bulge, a predominantly fissured surface of the metallic core is observed in the area of the stop surface of the locking part, which promotes the adhesion of the damping means in this area. This is because the damping means is advantageously designed as part of a plastic sheathing of the metallic core. In any case, this special design ensures that the plastic sheathing adheres perfectly to the metallic core, particularly in the area of the stop surface with the damping means, also and in particular taking into account the deformation forces absorbed in this area during the closing process.

The result is a door lock, and in particular a motor vehicle door lock, which has particular advantages over the prior art. First of all, the realization of a cavity in connection with the arrangement of the damping means on the edge ensures that particularly effective noise damping is achieved during a closing movement between the stop surface and the counter-stop surface. This is because the movement of the counter-stop surface moving towards the stop surface is already braked relatively far before it hits the stop surface with the aid of the damping means.

In fact, the damping means provided according to the invention at the edge of the stop surface can be equipped with a height above the stop surface which exceeds one millimeter more or less significantly, for example 2 mm, 3 mm, 5 mm and more. Nevertheless, the movement of the counter-stop surface is effectively damped when it approaches the stop surface, because the cavity of the damping means is initially compressed. Only after the compression of the cavity and the associated abutment of the longitudinal walls defining the cavity against one another does intramolecular damping of the further closing movement occur. All of this is advantageously combined with a particularly effective sheathing of the relevant locking component, to which, on the one hand, the indentation provided in the area of the recess and, on the other hand, the thickening on the respective metallic core opposite the indentation contribute. This is where the main advantages can be seen.

In the following the invention is explained in more detail with reference to a drawing showing only one embodiment; show it:

Fig. 1 The door lock according to the invention in an overview and reduced to the components essential for the invention,

Fig. 2 is a plan view of the stop surface with the damping means and

Fig. 3 shows a closing process between two locking components in

Side view.

In the figures, a door lock is shown which, according to the exemplary embodiment and not by way of limitation, is a motor vehicle door lock. The motor vehicle door lock has a locking mechanism 1, 2 consisting of a rotary latch 1 and a locking pawl 2 interacting therewith. With the aid of the rotary latch 1, a locking bolt 3 is caught and secured in the (main) closed state of the locking mechanism 1, 2 shown in FIG. An additionally realized in this context operating lever system and / or Verrie gelungshebelwerk and also provided electric motors are not shown overall because they are meaningless for the present invention, but of course find their expression in practice.

To, in particular, when closing the locking mechanism 1, 2

To avoid the development of noise, which can essentially be attributed to the fact that, during this process, a metal stop surface 4, which can be seen in FIG When the counter-stop surface 5 hits the rotary latch 1, a specially designed damping means 6 is implemented on the pawl 2 according to the invention. In principle, the damping means 6 can also be implemented on the rotary latch 1. For this reason, the following primarily and generally refers to locking components 1, 2, which are equipped with the corresponding stop surfaces 4, 5, which move against each other during a closing process of locking components 1, 2 and typically generate "metallic noises", which, however, according to the invention The dampening means 6 can be suppressed. These metallic noises can be attributed to the fact that both the rotary latch 1 and the pawl 2 are each equipped with a plastic casing 7 for the rotary latch 1 and a plastic casing 8 for the pawl 2, which is interrupted in the area of the stop surface 4, 5 . Otherwise, the plastic casing 7, 8 almost completely encloses a metallic core of the rotary latch 1 or pawl 2. As a result, the stop surface 4, 5 is also made of metal and the described noise development occurs without the damping means 6.

By comparing FIGS. 2 and 3, it can be seen that the damping means 6 is provided between the two locking components 1, 2 on the edge of the stop surface 4 on the pawl 2. The damping means 6 between the two locking components 1, 2 has a noise-dampening effect at least when they close interaction with one another due to its deformation, as will be explained in more detail below.

In addition to the attachment of the damping means 6 at the edge in relation to the few at least one stop surface 4 of the pawl 2 in the example, the damping means 6 also has a (vertical) height H compared to the associated stop surface 4. This height H is according to the exemplary embodiment in FIG As a rule, 1 mm, 2 mm, 3 mm or even 5 mm and more, is therefore significantly larger than in the generic prior art according to EP 1 500 762 B1. Of particular importance to the ok

Invention is the fact that the damping means 6 is equipped with a cavity 9 which is defined between two longitudinal walls 10 of the damping means 6. It can be seen that the cavity 9 extends essentially transversely to a closing movement or closing direction S of the locking components 1, 2 indicated in FIG. 3. In addition, the cavity 9 is designed in the shape of a lens. Furthermore, the cavity 9 has a length L which is adapted to a longitudinal extent L of the counter-stop surface 5 moving against the stop surface 4.

In fact, the longitudinal extension or length L of the cavity 9 corresponds to both the longitudinal extension L of the stop surface 4 and that of the counter-stop surface 5. In this way, the cavity 9 is practically over its entire length in the closing movement shown in FIG L compressed. Here, the stop surface 4 moves against the counter-stop surface 5 or vice versa. In this way, in a first area of the damping of the closing movement S between the two locking parts 1, 2, the cavity 9 is mainly compressed, which is accompanied by a macromolecular deformation of the plastic mostly used at this point to implement the damping means 6. In fact, it can be seen from the figures that the damping means 6 is designed as a component of the plastic casing 8 of the pawl 2. A thermoplastic material can advantageously be used as the plastic at this point, in which case, for example, polyethylene, polypropylene, polyester, polyamide, etc. have proven to be favorable. This is because such plastics can advantageously be processed into the respective plastic casing 7, 8 in such a way that the metallic core of the locking component 1, 2 remaining inside is encapsulated with the aid of the plastic, in which case only the two stop surfaces 4, 5 or the stop surface 4 and the counter stop surface 5 are cut out.

After the cavity 9 has been compressed in the first region of the damping during the closing movement S to such an extent that the two enter the cavity 9 defining longitudinal walls 10, the further relative movement between the two locking components 1, 2 along the closing direction S results in the damping means 6 or the plastic used at this point being intramolecularly deformed. Here, individual chains of the plastic molecules are elastically deformed, which corresponds to relatively high damping rates. That is, at the beginning of the damping of the closing movement S between the two locking parts 1, 2, there is a slight damping which, after the compression of the cavity 9, changes into a steadily increasing damping. This is expressly desired and leads to a particularly effective damping of the closing movement S and thus to the fact that disturbing noises associated therewith are avoided.

It can be seen from FIG. 2 that the damping means 6 is arranged in the region of a recess 4a of the stop surface 4. In addition, the figures make it clear that the recess 4a of the stop surface 4 extends in the direction of a locking component axis 2 'into a recess 11. The recess 11 is conically opened in the direction of the recess 4a. As a result, the plastic of the damping means 6 that engages in the recess 11 is constrained in the recess 11, as already described in the introduction. As a result, the recess 11 not only serves to anchor the damping means 6, but also counteracts any excessive deformations of the damping means 6 along the closing movement S.

On the basis of FIG. 2, it can also be seen that a bulge 4b is also implemented on an edge of the stop surface 4 opposite the recess 4a. The bulge 4b merges in the direction of the locking component axis 2 'into a thickening 12 in the metallic core of the associated locking component 2. The thickening 12 in connection with the recess 11 ensures that, through this jagged design of the surface of the relevant locking part 2, the plastic casing 8 in the area of the damping means 6 is particularly effective with the metallic core and cannot detach from it even on long time scales.

Reference number

Lock 1, 2

Rotary latch 1

Pawl 2

Locking component axis 2 ‘

Lock bolt 3

Stop surface 4

Recess 4a

Bulge 4b

Counter stop surface 5

Stop surfaces 4, 5

Damping means 6

Plastic coating 7

Plastic coating 8

Cavity 9

Longitudinal walls 10

Deepening 1 1

Thickening 12

Height H

Length L

Closing movement, closing direction S

Claims

1 door lock, in particular a motor vehicle door lock, with a locking mechanism (1, 2) consisting of a rotary latch (1) and at least one locking pawl (2), and with at least one damping means (6) between two locking components (1, 2), which at least when they are closing Interaction with one another has a noise-dampening effect due to its deformation, the damping means (6) being provided at the edge of at least one stop surface (4) on the rotary latch (1) and / or the pawl (2), and the damping means (6) opposite the associated stop surface ( 4) has a certain height (H), d a- denotes that the damping means (6) is equipped with a cavity (9) which is compressed when the two locking components (1, 2) make contact.

2. Door lock according to claim 1, characterized in that the cavity (9) is lens-shaped.

3. Door lock according to claim 1 or 2, characterized in that the cavity (9) has a length (L) which is adapted to a longitudinal extent (L) of a counter-stop surface (5) moving against the stop surface (4).

4. Door lock according to one of claims 1 to 3, characterized in that the damping means (6) is arranged in the region of a recess (4a) of the stop surface (4).

5. Door lock according to claim 4, characterized in that the recess (4a) of the stop surface (4) merges in the direction of a locking component axis (2 ‘) in a recess (1 1) in the metallic core of the locking component (2).

6. Door lock according to claim 5, characterized in that the recess (1 1) opens conically in the direction of the recess (4a).

7. Door lock according to claim 5 or 6, characterized in that the recess (1 1) is used to anchor the damping means (6).

8. Door lock according to one of claims 4 to 7, characterized in that a bulge (4b) is realized on one of the recess (4a) opposite edge of the stop surface (4).

9. Door lock according to claim 8, characterized in that the bulge (4b) merges in the direction of the locking mechanism (2 ‘) into a thickening (12) in the metallic core of the locking component (1, 2).

10. Door lock according to one of claims 1 to 9, characterized in that the damping means (6) is designed as part of a plastic casing (8) of the metallic core of the locking component (2).