Method for producing motor vehicle locks with a twisted locking part edge

Patent metadata

Field	Value
Publication number	US-9856680-B2
Application number	US-201314649937-A
Country	US
Kind code	B2
Filing date	Dec 11, 2013
Priority date	Dec 12, 2012
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

In order to minimize the sliding friction between the locking parts that is, between the pawl and the rotary latch of a motor vehicle lock, it is advantageous if, during the production process, the different latch surfaces of both locking parts are provided with a stamping contour having straight grooves and with a stamping contour characterized in that the provided grooves are oblique. Said oblique grooves of the latch surface on the pawl are placed in the position indicated in figure such that the entire pawl is twisted about the longitudinal axis thereof. Also, at least two overlapping points are provided between the straight grooves and the oblique grooves such that both of the locking parts come into mutual contact reducing the friction.

First claim

The invention claimed is:

1. Method for producing a first locking part of a motor vehicle door lock, namely, a catch and a second locking part of the motor vehicle door lock, namely, a pawl, wherein:
the catch and the pawl are stamped, said stamping generates a stamped contour that includes grooves extending across a thickness of both the catch and the pawl along an axis;
after said stamping, one of the locking parts is deformed by twisting by a specified angle in an area which is engaged by a stamping contour of the other locking part such that the grooves on the twisted locking part in the area are not aligned with either the axis or the grooves on the other locking part that engage the area; and
the catch and the pawl are coated except for latching surfaces.

2. Method according to claim 1 , wherein the grooves in the stamped contour of the catch and the pawl include straight grooves, the pawl is twisted by a specified first angle, so that the twisted grooves of the pawl are oblique relative to the straight grooves in the catch.

3. Method according to claim 2 , wherein the catch is twisted by a second angle, resulting in at least two overlapping points of straight and oblique grooves.

4. Method according to claim 2 , wherein the first angle of twisting is set to 5-15° depending on the thickness of the pawl and the distance of the grooves.

5. Method according to claim 1 , wherein the catch and pawl are twisted to such an extent that the grooves of the other facing latching surface of the catch and the pawl contain respective overlapping points or contact points.

6. Motor vehicle door latch with a first locking part, namely, a catch and a second locking part, namely, a pawl locking the catch when the motor vehicle door is closed, wherein both the catch and the pawl contain corresponding ratchet surfaces on vertical edges created during stamping, the ratchet surfaces including straight grooves extending along an axis and a coating except for on the ratchet surfaces, one of the locking parts is deformed by twisting the one locking part after stamping so that the ratchet surface on the one locking part includes a stamping contour whose straight grooves are obliquely arranged in relation to both the axis and the straight grooves of the other locking part as a result of twisting of the one locking part.

7. Motor vehicle door latch according to claim 6 , wherein the oblique grooves are formed on the twisted part of the pawl.

8. Motor vehicle door latch according to claim 6 , wherein both the catch and the pawl are twisted in opposite directions by a respective smaller angle.

9. Motor vehicle door latch according to claim 6 , wherein the catch is twisted in the area opposite to the pawl creating respective overlapping points on the ratchet surfaces.

10. Motor vehicle door latch according to claim 6 , wherein the pawl or the catch is twisted around its longitudinal axis.

11. Method according to claim 3 , wherein the angle of twisting is set to 5-15° depending on the thickness of the pawl and the distance of the grooves.

12. Method according to claim 2 , wherein the catch and pawl are twisted to such an extent that the grooves of the other facing latching surface of the catch and the pawl contain respective overlapping points or contact points.

Assignees

• Kiekert Ag

Inventors

• Bendel Thorsten
• Pohle Werner
• Waldmann Thomas

Classifications

• E05B79/10

  Connections between movable lock parts · CPC title

• B21D28/16

  Shoulder or burr prevention {, e.g. fine-blanking} · CPC title

• E05B77/36 Primary

  Noise prevention; Anti-rattling means · CPC title

• E05B85/243 Primary

  with a bifurcated bolt · CPC title

• E05B85/26

  Cooperation between bolts and detents · CPC title