DE102009029031A1 - Locking mechanism for door lock of motor vehicle, has contact area arranged adjacent to stop surface such that closing moment of pawl is changed into opening moment during opening of mechanism - Google Patents

Abstract

The mechanism has a rotatably supported catch (1) and a pawl (4) provided for locking the supported catch in a closing position. The pawl has a closing moment in a main locking position of the mechanism. A contact area (8) is provided between the pawl and the catch. The contact area is arranged adjacent to a stop surface (9) such that the closing moment of the pawl is changed into an opening moment during opening of mechanism, where the stop surface serves for locking a door lock. The contact area extends over a distance of 3 mm.

Description

The invention relates to a locking mechanism for a lock of a motor vehicle. Such a lock has a - against a spring force - rotatably mounted rotary latch for receiving a locking bolt and a pawl, with which the catch can be rusted in at least one closed position - usually against a spring force.

An initially mentioned lock comprises at least one lock housing with a metal plate, which is usually made of metal (also called lock case), with a locking mechanism mounted thereon. The lock plate is generally provided with an inlet slot for receiving a locking bolt. A locking mechanism comprises a rotatably mounted rotary latch for receiving a locking bolt. The locking mechanism further has a pawl with which the catch can rust.

The catch of a motor vehicle lock usually has a bifurcated inlet slot formed by load arm and catching arm into which the locking bolt of a vehicle door or flap, for example bonnet or trunk lid, comes when the door / flap is closed. The locking pin then rotates the catch from an open position to a closed position. If the catch has reached the closed position, it will rust in this position on the pawl. The locking bolt can not leave the inlet slot of the rotary latch. This detent position is called main detent position.

There are motor vehicle locks with a second Verrastungsposition, namely the so-called pre-locking position. The pre-detent position serves to intercept the corresponding door or flap if it does not reach the main detent position when closing.

In the pre-locking position, the rotary latch is consequently not completely closed, but an opening movement of the rotary latch is already prevented by a pawl. Therefore, also the area of the catch that receives the pawl in this position, referred to as a pre-rest. Finally, in the main catch position, the catch is completely closed. The pre-restraint thus represents a transition state between the opened state and the main rest and is provided for safety reasons.

If a pawl rusted a catch, so the catch applies in simple held locks, in particular due to a door seal pressure so directed pressure on the pawl that this transmits a directed towards the rotary latch torque on the pawl. Therefore, the pawl can not then leave the rest independently and has a so-called closing moment. "Closing moment" means the case below that the pawl can not leave a detent position solely due to a pressure exerted by a rusted catch on the pawl. According to the document DE 10 2007 045 228 A1 is in relatively simple locks required a relatively large force required to open this. If the pawl has a closing moment, such a ratchet is usually designed in such a way that said torque is small in order not to complicate the opening process too much.

In order to reduce the force required for opening, according to the DE 10 2007 045 228 A1 proposed a locking mechanism in which the catch in the main locking position transmits an oppositely directed torque to the pawl, so that the pawl is able to leave a detent position solely on the basis of the pressure exerted by the catch and the pawl is able to push out of the detent position, which however the closed position is prevented by a further pawl. The pawl then has an opening moment. "Opening moment" thus means that the catch transmits such a torque to the pawl by exerting pressure that the pawl is able to leave the detent position solely because of this pressure.

Will the from the DE 10 2007 045 228 A1 . 1 pivoted known pawl with the closing moment in the main detent position of the rotary latch away, so slides a lateral contour portion of the rotary latch on an adjacent lateral contour region of the pawl and is finally moved over an edge of the pawl. The edge has a small corner radius. In such locks, the corner radius is usually about 1 mm. If the lateral contour region of the rotary latch slides over this pawl edge, then both the rotary latch and the pawl are abruptly accelerated abruptly. The result is sounds that are called Öffnungsplopp.

Such Öffnungsplopp occurs in a much attenuated form, even with locks with a pawl, which have an opening moment. In such a case, neither the catch nor the pawl is abruptly maximally accelerated. Instead, the catch urges the pawl initially relatively slowly out of the detent position. Both the catch and the pawl are thereby accelerated relatively slowly. Although a lateral contour region of the catch is at the out of the 2 of the DE 10 2007 045 228 A1 finally known embodiment also via a pawl edge moved away and then released so that the catch can rotate to the open position. However, since both the rotary latch and the pawl already perform a rotary motion at this moment, the opening pop is much lower.

A locking mechanism for a motor vehicle lock with a reduced opening plop is out of the box DE 10 2007 003 948 A1 known because the pawl known from this has an opening moment.

From the DE 10 2007 055 412 A1 is the occurrence of excessive opening noise known, which occurs in motor vehicle locks, in which run when notching the pawl small radii of curvatures and cause a sudden release of the contact of the rotary latch and pawl. In order to avoid an associated opening noise, a pawl with an additional relief element and the catch is expediently provided with a cam. The cam interacts with the relief element. The relief element or the cam are provided with a shock absorbing means, whereby excessive opening noise can be avoided.

The object of the invention is to provide a simplified locking mechanism for locks, which can be opened relatively quietly.

This object is achieved with a locking mechanism for a lock, which has the features of claim 1.

Advantageous embodiments and modifications of the invention are the subject of the dependent claim 1 dependent claims.

According to the pawl is provided with a stop surface on which the catch rests with a contact surface provided on it, when the pawl locks the catch and thus this is in its locking position and especially in the so-called main rest position, in which the lock is completely closed , The stop surface of the pawl and the contact surface of the pawl are selected so that the pawl has a closing moment. The contour regions of pawl and rotary latch are also such that the closing moment of the pawl when opening the door lock passes into an opening moment. For this purpose, adjacent to the abutment surface directly adjacent to another surface which extends so that the pawl is urged out of its detent position by the pressure of the rotary latch out. So there is no abrupt demolition, which would cause the unwanted opening popping. In contrast to the conventional state of the art, the rotary latch is therefore not merely moved over a pawl edge with a radius of 1 mm and less, in order then to release the rotary latch abruptly.

If a lock according to the invention is opened, after the static friction has been overcome, a sliding friction region occurs between the surfaces abutting one another in the locking position, namely the stop surface of the pawl and the contact surface of the rotary latch. Due to the sliding friction, the catch and the pawl are braked separated from each other, so to speak.

In contrast to the one from the publication DE 10 2007 055 412 A1 known prior art is not required in addition to the pawl a relief element together with shock absorbing means. This leads to a considerable simplification of the structure of the locking mechanism. It was surprisingly found that can be avoided by a transition from a closing moment of the pawl to an opening moment in the same good way the opening popping as in the from DE 10 2007 055 412 A1 known prior art, although a significantly reduced technical effort is operated.

In one embodiment, the contact area between the rotary latch and the pawl causing the opening element extends over a distance of at least 2 mm, preferably at least 3 mm. This contact area is formed for example by a chamfer of the pawl, which acts on the catch, so as to create an opening moment. A contour region of the rotary latch then has to glide over a surface of the rotary latch that is several millimeters long before the pawl releases the rotary latch.

In the 1 to 3 are exemplary embodiments of the locking mechanism according to the invention shown schematically in plan to further explain the invention.

The locking mechanism according to the invention is part of a door lock for motor vehicles, which is not shown in detail. From this door lock is in the drawing, the catch of interest here 1 shown. The catch 1 is about the axis of rotation 12 rotatably mounted and includes an inlet slot 2 in the form of a recess for receiving the locking bolt, not shown, of the door lock The locking bolt is held by the catch in the inlet slot when the catch 1 is in a closed position.

The catch 1 contains another indentation 3 into which the pawl 4 for the purpose of Lock the latch can latch, as described below.

The pawl 4 is about an axis 5 pivoted. On a lever arm 6 the pawl 4 is a protruding nose 7 provided in the in 1 shown locking position in the recess 3 the catch 1 can be indented, as the drawing illustrates.

On the inside of the indentation 3 is the catch 1 with a contact surface 8th provided, the planar surface radially to the axis of rotation shown 12 the catch 1 runs.

The nose 7 the pawl 4 has a stop surface 9 on that in the in 1 shown locking position at least substantially parallel to the contact surface 8th the catch 1 lies and completely against the contact surface 8th sets. The contact surface 8th exerts in the locking position shown such a directed pressure on the pawl that it has a closing moment.

The contour of the nose 7 also has a bevel 10 on, the absatzlos into the stop surface 9 goes over, so when unlocking the pawl 4 the contact surface 8th the catch 1 - At least with an outer edge thereof - along the chamfer 10 can slide, creating an opening moment on the pawl 4 is transmitted. The pawl is then further urged out of its position blocking the catch. The chamfer extends over a length of at least 2 to 3 mm, preferably of at least 5 mm (see 2 ). This chamfer prevents a sudden tearing of the lock and thus avoids a corresponding corresponding noise (opening pop). Essential is a closing moment followed by a gently opening moment. Stiction and sliding friction can and should then be kept as small as possible.

The bevel 10 preferably merges into an arcuate contour with a radius which is substantially greater than 1 mm. This radius is preferably at least 5 mm. Slides the contact surface 8th or an adjacent area during opening over the chamfer 10 Eventually, so the arcuate contour is finally achieved, which then avoids a greater acceleration of the pawl suitably, so as to further improve an opening popping oppose. The bevel 10 closes with the contact area 9 an angle of 135 ° (see 2 ).

To open the lock, the pawl is turned clockwise. Slides a lateral contour region of the rotary latch on the chamfer 10 away, so turns the catch 1 also clockwise towards opening position.

The stop 13 the pawl avoids that the pawl can be rotated excessively in the direction of locking position. The catch 1 has a pre-rest 14 into which the pawl 4 can also lock. Latches the pawl in the first position 14 a, so the lock is not yet completely closed. However, a locking bolt is already held by the catch.

In the 1 and 2 is the bevel 10 as a rectilinear surface that has a radius with the stop surface 9 connected to recognize.

Alternatively, the chamfer may also have an arcuate contour, the transitionless from the stop surface 9 runs out and thus also a sudden disconnection of rotary latch 1 and pawl 4 avoids how the 3 shows. The arcuate contour then has a minimum radius r, which is substantially greater than 1 mm. This radius r is preferably at least 10 mm, more preferably at least 20 mm in size.

It is essential that, on the one hand, the mutual liability of the land 8th and 9 required static friction is ensured and on the other hand, the separation between the catch and pawl gently and not abruptly, but braked, so to speak.

The aforementioned pawls contour regions, which cause a gentle acceleration of the rotary latch and pawl during opening, may also be provided alternatively in the case of the rotary latch in the sense of a kinematic reversal.

LIST OF REFERENCE NUMBERS

1

catch

2

Inlet slot of the rotary latch

3

indentation

4

pawl

5

Rotary axis of the pawl

6

lever arm

7

Pall lug

8th

contact area

9

stop surface

10

bevel

11

arcuate contour region with preferably large radius

12

Rotary axis of the rotary latch

13

attack

14

first position

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007045228 A1 [0006, 0007, 0008, 0009]
• DE 102007003948 A1 [0010]
• DE 102007055412 A1 [0011, 0017, 0017]

Claims (8)

Lock for a lock of a motor vehicle with a rotatably mounted rotary latch ( 1 ) and with a pawl ( 4 ) for locking the rotary latch in a closed position, wherein the locking pawl has a closing moment in the main locking position of the locking mechanism, characterized in that it has a contact area ( 8th . 10 . 11 ) between the pawl ( 4 ) and the contour of the catch ( 1 ) adjacent to a stop surface ( 9 ) is arranged so that the closing moment during the opening of the locking in an opening moment passes. Locking mechanism according to claim 1, characterized in that the contact area ( 8th . 10 . 11 ) extends over a distance of at least 2 mm, preferably of at least 3 mm. Locking device according to claim 1 or 2, characterized in that the contact area has a flat surface ( 10 ), which is provided with a pawl contact surface ( 9 ) includes an angle of 120 ° to 150 °. Locking device according to one of the preceding claims, characterized in that the contact region is a chamfer ( 10 ) an adjoining curved contour ( 11 ) or an arcuate contour ( 11 ) with a minimum radius (r) of 10 mm. Locking device according to the preceding claim, characterized in that the arcuate contour ( 11 ) has a minimum radius of 5 mm, preferably of 10 mm. Lock according to one of the preceding claims, characterized in that the locking mechanism is such that in the main locking position, a pressure of the rotary latch ( 1 ) directed in the direction of a rotary latch torque on the pawl ( 4 ) transmits. Locking mechanism according to one of the preceding claims, characterized in that the locking mechanism does not comprise a release means or a cam cooperating therewith. Lock of a motor vehicle with a locking mechanism according to one of the preceding claims.

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