Patent Application
20100024193
The invention relates to a motor vehicle door lock which is connected to a vehicle door in which the motor vehicle door lock comprises a carrier plate whereon the locking pieces are mounted and a lock housing which at least partially surrounds the locking pieces comprising the carrier plate.
Usually, used motor vehicle door locks are supplied as separately installed parts, which are then installed by the vehicle manufacturer. In most cases, the motor vehicle door lock contains moving parts that have to ensure the correct locking of the vehicle door. In most cases, catches on the door lock side are used, co-operating with pins or hinges on the chassis side to lock the motor vehicle door.
The locking pieces have to absorb considerable forces, as break-ins as well as an unwanted opening of the door, in case of an accident, must be prevented. The catches and the pawl locking the catch and the parts in the motor vehicle door lock on which these are mounted must therefore be mounted securely.
As a result of the solid connection of the moved parts on the carrier plate, the generation of noise and transmission onto and by the carrier plate can hardly be avoided, in particular due to the chassis twisting during driving.
Generally, the motor vehicle door lock is secured by bolts that extend through the door panel and are bolted to the metal carrier plate. For this purpose, threads cut into the carrier plate are provided in most cases.
As a result of this type of fixing, the generation of noise and transmission onto the door panel can only be partially reduced with considerable silencing efforts.
In modern vehicles, however, more and more emphasis is placed on ensuring that moving parts, such as motor vehicle door locks operate as silently as possible. Conventional motor vehicle door locks therefore have to be equipped with means requiring additional assembly or with costly low-noise fixings, which is expensive and laborious.
Another disadvantage in the production of standard vehicle door locks is the high number of used individual parts that have to be individually assembled as this is costly. At the same time, the individual parts and assembled unit have to fulfill high mechanical requirements with regard to stability under stress, in particular in case of a crash.
The invention has the task of reducing the aforementioned disadvantages and of providing an improved motor vehicle door lock and to improve, in particular, the overall process sequence of production with regard to its economic efficiency and quality.
This task is solved by a motor vehicle door lock provided in connection with a vehicle door, as described in claim 1.
The invention provides a connection counter piece formed from the side of the housing which is opposite the carrier plate in such a manner that it co-operates with a connection element in the vehicle door by means of a through opening in the carrier plate.
The invention suggests avoiding the until now standard connection of a motor vehicle door lock consisting of a direct connection between the motor vehicle door lock and the carrier plate itself as this has until now acted as a noise transmission bridge. Where the lock housing is produced from a noise-reducing material, the connecting element connecting the motor vehicle door lock to the vehicle door is not in contact with the carrier plate. This allows optimum noise reduction.
Preferably, the connection counter piece consists of a cone-shaped vertically extending dome.
Consequently, a particularly advantageous and thus preferred embodiment of the invention provides that on the side of the carrier plate facing the lock housing and around the through opening, a dome/cone seat is formed for co-operation with the conical dome, said seat having a funnel-shaped opening for accommodating the cone-shaped dome. This creates a self-centering connection guaranteeing an optimum process sequence during assembly. As a result of the thus created large conical support surface, lateral forces between the lock housing and the carrier plate are not transmitted onto the connection element.
The dome/cone seat is preferably produced by extrusion coating, using the so-called Outsert process. During this process, the plastic material is sprayed directly around the parts to be enclosed and edges, openings or projections on the metal carrier serve as an anchor or projection for the plastic. Assembly of the extruded parts is therefore not required. As a result, numerous process steps and material for the parts otherwise required for assembly are saved and costly logistics and storekeeping of parts that would otherwise have to be manufactured and supplied individually is also no longer required.
The Outsert method allows the production of very precise shapes with very low tolerances. As also no installation is required, any potential tolerances of the geometries associated therewith, are also avoided.
In an advantageous embodiment of the invention a bearing for the thread of a bolt extending through the through opening is provided in the connection piece. This bearing can be a thread but also an opening in a material allowing the use of self-cutting bolts as connection element.
Advantageously, the carrier plate is made from a shape-retaining material, in particular metal.
Preferably, the locking pieces are a catch and/or a pawl of the motor vehicle door lock.
In a particular advantageous further development of the invention, the external edges and/or edges of openings or punched-out sections of the carrier plate contain a plastic extrusion coating covering the edges at least partially, said plastic extrusion coating having, in particular, being applied using the Outsert method. As a result, potential injuries can be prevented and the usually required labor-intensive deburring is no longer necessary in most cases. The extrusion coating also protects the edges against corrosion as open punched or cut out areas are sealed and no longer in contact with air. As a result of the extrusion coating also thicker material can be used, whose edges do not contain an earlier applied protective layer, e.g. zinc layer because of the processing—e.g. punching.
The extrusion coating also allows a better design in the visible area of the door lock, as any type of surface and forms can be achieved.
In order to reduce noise or friction, a further advantageous embodiment of the invention provides that at least partially between the locking pieces and the carrier plate and/or the frame box and/or the lock housing, a layer of extrusion coating is applied, in particular by the Outsert method. Such an extrusion coating applied from the outside can, apart from reducing the noise, also achieve an improved design of the entire motor vehicle door lock.
An embodiment characterized by an efficient production provides that the plastic extrusion coatings on the carrier plate are produced in a single production step, using the Outsert method.
Advantageously, a transportation fixing extends vertically from the carrier plate for connecting the lock housing to the carrier plate containing snap-in projections for the transportation fixing which are provided on an edge or a formed shape on the lock housing for locking.
Preferably, the lock housing and/or the conical dome and/or the transport fixing are made from plastic, in particular a technical plastic and/or fiberglass or carbon-fiber reinforced plastic.
Advantageously, the carrier plate is formed by a frame box of a motor vehicle door lock. If the Outsert method is used, also the lock housing enclosing the locking pieces on the carrier plate can be produced in one piece.
Preferably, a noise-reducing layer is provided between the vehicle door and the motor vehicle door lock with the noise-reducing layer having been applied by plastic extrusion coating, in particular by using the Outsert method.
Other advantages, peculiarities and useful further developments of the invention are shown in the further subclaims or their subcombinations.
Below, the invention is explained in more detail with reference to drawings. The individual diagrammatic views are as follows:
The same reference figures in the drawings refer to the same elements or elements that function in the same way.
Also a layer of plastic extrusion coating 52 was applied onto the surface of the carrier plate 4, serving partly as gliding aid and sound insulation between the locking pieces and the carrier plate.
The edge 46 of the carrier plate 4 is also covered by plastic extrusion coating 55, sealing it from exposure to air and preventing risk of injury from sharp burrs.
The catch 21 and the pawl 22 are placed onto the ends of the bearing rods and pushed down against the carrier plate 4.
The representation also shows the locking pieces 2, in form of a catch 21 and a pawl 22 in the position they occupy on the bearing pins 1. The bearing pins are mounted with their ends in the seats 33 of the lock housing 32.
In order to achieve further noise reduction, the catch 21 and the pawl 22 are also partly coated with a plastic extrusion coating 53.
A noise-reducing layer 56 is formed around the through opening 43, serving as a noise muffler between the vehicle door and the motor vehicle door lock 3 (see also
The tip of the cone-shaped dome 35 with the opening of bearing 37 for the connection element can be seen through the through opening 43.
In this view also a plastic extrusion coating 5 of the bearing pins 1 can be seen from below.
A transportation fixing 9 extends vertically from the carrier plate 4 containing two snap-in projections 91 at its tip which engage with an edge 38 on the lock housing 32 after being pushed through the opening (see
Also a section of the plastic extrusion coating 55 of the edges is shown.
In order for the connection counter piece 34, e.g. the vertically extending cone-shaped dome 35 formed from the side 36 of the lock housing 32, which is opposite to the carrier plate 4, to be positioned exactly opposite to the through opening 43 on the surface 42 of the carrier plate 4, the dome/cone seat 44 on the carrier plate 4 was formed using the Outsert method. The funnel-shaped opening 45 ensures that the cone-shaped dome 35 is reliably arranged in its end position.
After the transportation fixing 9 has engaged with the edges 38, the through opening 43 is in
During installation in a vehicle, the ready motor vehicle door lock 3 is positioned onto a panel of a vehicle door 8 as shown in
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2004 001 982.7 | Jan 2004 | DE | national |
This application claims priority under 35 U.S.C. 119 and 35 U.S.C. 365 based upon German Patent Application No. 10 2004 001 982.7, filed on Jan. 13, 2004. Pursuant to 35 U.S.C. 121, this application is also a divisional application of U.S. patent application Ser. No. 10/586,028, filed on May 22, 2007. The entire disclosures of the aforesaid applications are incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 10586028 | May 2007 | US |
| Child | 12577697 | US |
