MOTOR VEHICLE LOCK COMPRISING A BRAKING PAWL AND A DRIVING DOG MECHANISM

Abstract

The aim of the invention is to provide a locking mechanism for a lock, which can be opened quietly. To achieve this aim, a lock is proposed comprising a locking mechanism with a rotary latch, a locking pawl for locking the rotary latch in a detent position and a braking pawl which initially can brake a rotary motion of the rotary latch that occurs after or during a movement of the locking pawl out of its detent position. Opening sounds can be reduced by means of this initial braking action. The lock also comprises a driving dog mechanism with a translatory action that can lift the braking pawl out of its braking position. This ensures that the braking pawl is moved out of its braking position in a reliable manner so that the lock can be opened.

Claims

1. A latch with a locking mechanism comprising a catch for the accommodation of a locking bolt and a pawl for ratcheting of the catch in a ratchet position, wherein a brake latch is present which is capable of braking a rotational movement of the catch during lifting or following lifting of the pawl out of its ratchet position and that a towing arm mechanism with transmission is present.

2. The latch according to claim 1, wherein the towing arm is attached on the pawl with the locking moment.

3. The latch according to claim 1, wherein the brake latch is made of plastic.

4. The latch according to claim 1, wherein the brake latch is thinner than the pawl.

5. The latch according to claim 1, wherein the pawl is at least predominantly made of metal.

6. The latch according to claim 1, wherein the catch is at least as thick as the pawl.

7. The latch according to claim 1, wherein the catch is at least predominantly thinner than the overall thickness of the brake latch and the pawl.

8. The latch according to claim 1, wherein the catch is thicker in the area of its locking surface compared to the remaining thickness.

9. The latch according to claim 1, wherein the pawl and brake latch are pivotably accommodated coaxially.

10. The latch according to claim 1, wherein the radius of the braking surface of the brake latch is greater than 0.8 mm.

11. The latch, in particular according to claim 1, with a locking mechanism comprising a catch for the accommodation of a locking bolt and a pawl for ratcheting of the catch in a ratchet position, wherein a brake latch is present which is capable of braking a rotational movement of the catch during lifting or following lifting of the pawl out of its ratchet position which is pre-tensioned by a spring in the direction of the braking position

12. The latch according to claim 11, wherein the pre-tensioning of the spring can be adjusted.

13. The latch according to claim 12, wherein a number of mountings are present for mounting of a leg of the spring.

14. A procedure for opening of a locking mechanism according to claim 1, for opening of the locking mechanism initially the pawl is moved out of its ratchet position by actuation of an actuation device and subsequently the brake latch is moved out of its braking position by the catch.

Description

[0032] The invention is described in greater detail on the basis of figures hereinafter.

[0033] The following are shown:

[0034] FIG. 1: A top view of the locking mechanism in the ratcheted state;

[0035] FIG. 2: locking mechanism in a perspective view;

[0036] FIG. 3: locking mechanism during an opening process;

[0037] FIG. 4: cut through catch, pawl and brake latch in the area of the locking surfaces/braking surface.

[0038] A catch 1 with a load arm 2 and a catching arm 3 is shown in FIG. 1. The catch 1 can be rotated around its axis 4. In the ratcheted state, a locking bolt 5 cannot leave the catch 1. The catch 1 can be ratcheted by means of a pawl 6 as shown in FIG. 1. A brake latch 7 is located behind the pawl 6. Both latches 6 and 7 are pivotably accommodated coaxially 8. The latch furthermore demonstrates a deflection lever 9 which is capable of transmitting a pivoting movement of the pawl 6 to the brake latch 7. The deflection lever 9 is a towing arm mechanism with transmission. The deflection lever 9 is pivotably accommodated by an axis 10.

[0039] In the ratcheted state, the locking surface 12 of the pawl 6 is adjacent to the locking surface 11 of the catch 1 as shown in FIG. 1. At the same time, behind this the brake latch 7 with a braking surface 13 (see FIG. 2) lies adjacent to the locking surface 11 of the catch 1 lies.

[0040] A spring leg 14 of a spring is adjacent to the brake latch 7 in such a way that the brake latch 7 can be moved by spring force in the direction of its braking position. The other leg 15 of this spring is located in a mounting 16, of which a number are envisaged to be able to adjust the pre-tensioning of the spring with the spring legs 14 and 15.

[0041] FIG. 2 shows the illustration from FIG. 1 from the rear in a perspective view. FIG. 2 illustrates the adjacency of the braking surface 13 to the locking surface 11 of the catch 1. Furthermore, FIG. 2 illustrates that the lever 9 is adjacent with its lever end 18 to a bolt 17 at the end of the brake latch 7. Furthermore, the spring leg 14 is adjacent to the bolt 17 in such a way that the brake latch 7 is pressed in the direction of its braking position. FIG. 2 shows that the area of the locking surface 11 of the catch 1 is broadened compared to the remaining thickness of the catch 1 (see also FIG. 4). This ensures that the brake latch 7 and the pawl 6 can simultaneously lie adjacent to the locking surface 11 of the catch without the catch 1 overall needing to be executed with relevant thickness. This helps to minimize the material consumption and the weight.

[0042] FIG. 3 shows the start of the triggering process or opening of the latch . The pawl 6 has been pivoted a few degrees around its axis 8 in a counter-clockwise direction. The pawl 6 has left its ratchet position. A lateral contour area 19 of the pawl 6 has thus reached a protruding bolt 20 of the deflection lever 9. The pawl 6 has therefore been moved out of its ratchet position without transmitting a pivoting movement to the brake latch 7.

[0043] The locking surface 11 of the pawl 1 is now only adjacent to the braking surface 13 of the brake latch 7. As the catch 1 initiates an opening moment into the brake latch 7, with sufficiently great torque the brake latch 7 is now also moved out of its braking position against the force of the spring 14, 15. In principle, the force of a pre-tensioned spring which pre-tensions the catch 1 in the direction of the opening position is not sufficient for this purpose. Firstly, a sufficiently great door sealing pressure needs to be added. As the catch 1 due to the brake latch 7 is not accelerated abruptly but comparatively slowly, opening noises are prevented.

[0044] If, for example, a door sealing pressure is not sufficient due to signs of fatigue, in order to initiate a sufficiently great torque by means of the catch 1 into the brake latch 7, the towing arm mechanism becomes effective in which the pawl is rotated further in a counter-clockwise direction. Hereby, the transmission lever 9 is now pivoted around its axis 10 also in a counter-clockwise direction.

[0045] The lever end 18 of the transmission lever then moves the bolt 17 and thus pivots the brake latch 7 out of its braking position. The transmission ratio is 4:1. It is therefore sufficient to pivot a pivoting of the pawl 6 by only 5°, around the brake latch 7 by 20°. With a relatively small additional pivoting movement of the pawl 6 the brake latch 7 can therefore be moved completely out of its braking position by means of the transmission lever 9. Subsequently, the catch 1 can be pivoted into its open position and the locking bolt 5 can leave the latch or the locking mechanism of the latch.

[0046] FIG. 4 illustrates the broadening of the catch 1 in a sectional view in the area of the locking surface 11 in addition to the adjacent areas of the brake latch 7 and the pawl 6.

REFERENCE SIGN LIST

[0047] 1. Catch [0048] 2 Load arm [0049] 3. Catching arm [0050] 4 Catch axis [0051] 5 Locking bolt [0052] 6 Pawl [0053] 7 Brake latch [0054] 8 Axis for the pawl and the brake latch [0055] 9. Deflection lever [0056] 10 Axis of the deflection lever [0057] 11 Locking surface of the catch [0058] 12 Locking surface of the pawl [0059] 13 Braking surface of the brake latch [0060] 14 Spring leg for brake latch [0061] 15 Spring leg [0062] 16 Mounting for spring leg [0063] 17 Bolt [0064] 18 Lever end