DE202020102588U1 - Drive motor for a motor vehicle locking system - Google Patents

Abstract

Motor (10) for a motor vehicle locking system with a shaft (1) and a worm (3) attached to the shaft (1), characterized in that the shaft (1) has at least a first and a second oval-shaped section (2), into which the worm (3) extends for a positive connection, the sections (2) being offset relative to the axis of rotation (R) of the shaft (1).

Description

The present invention relates to the field of vehicle locking systems and relates to a motor with a shaft and a worm wheel attached to the shaft for use in an actuating unit of a motor vehicle. The invention further relates to a manufacturing method.

Actuators with worm gears are often used to achieve positioning movements in motor vehicle locks, closing devices or linear drives. Motors with an extended output shaft are used, with a worm wheel connected to the output shaft of the electric motor. The pamphlets DE 10 2009 036 834A1 , WO 12 028 120 A1 , WO 12 028 121 A1 such as WO 13 000 454 A1 disclose to use such actuators with worm gears in motor vehicles.

In order to reliably attach a worm wheel to the shaft of a motor, shafts with a D-shape in cross section are preferably used for power transmission. This shape is also known as the D-Cut. A recess in the worm wheel is also D-shaped in cross section. A positive connection effected in this way can ensure reliable power transmission.

In the case of actuators for use in motor vehicle locks, what is important is a particularly small design and low weight. The components of an actuator are made correspondingly small. A diameter of a shaft of an electric motor used is therefore also particularly small. The components of such an actuating unit are made of plastic where possible to save weight.

With the known D-cut geometries, difficulties may arise with regard to the component tolerances, which then lead to problems when the screw is under load and then accordingly lead to the screw rotating on the motor shaft or to material failure of the screw.

The object of the invention is to at least partially overcome the disadvantages known from the prior art. In particular, it is the object of the present invention to enable the worm to be securely locked on the motor shaft.

According to the invention, the object is achieved by a motor for a motor vehicle locking system with a shaft and a worm attached to the shaft. It is essential here that the shaft has at least a first and a second oval-shaped section, into which the screw extends for a positive connection, the oval sections being offset relative to the axis of rotation of the shaft.

Advantageous further developments and improvements of the invention are specified in particular in the subclaims. It is pointed out that the exemplary embodiments described below are not restrictive for explaining the invention, but rather there are numerous possible combinations and variations of the features described in the description, the drawings and the subclaims for carrying out the invention. Features and details that have been described in connection with the device according to the invention apply, of course, also in connection with the motor vehicle locking system according to the invention and vice versa, so that with respect to the disclosure of the individual aspects of the invention, reference is always or can be made to one another.

The configuration according to the invention now enables the necessary power transmission to be guaranteed and at the same time prevents the worm from rotating on the motor shaft. The oval sections, formed sections of the shaft, are preferably arranged in complementary recesses in the worm. Accordingly, the worm has corresponding recesses in the area of the contacted motor shaft, into which the sections can engage in a form-fitting manner. It is also conceivable that the worm is elastically deformed when the shaft drills into the worm / when the motor shaft is inserted into the worm.

It can be advantageous if there are more than two sections. A plurality of sections can improve the power transmission and enable a further improvement of the anti-rotation device.

The two or more sections preferably extend to one end of the shaft and have a course such that the worm can be pushed onto the shaft and thus connected to the shaft. This simplifies assembly. Nevertheless, a reliable connection can be achieved even if the shaft is prevented from detaching from the shaft simply because of a material connection (using an adhesive) and / or due to a non-positive connection (due to an interference fit).

The sections can be shaped, for example, by means of a die. However, further forming processes or primary forming processes are also conceivable.

According to the invention, it can be provided that the oval sections are formed / arranged offset from one another between approximately 1 ° and approximately 180 °, preferably between approximately 20 ° and approximately 90 °. This further improves the anti-rotation device. The motor shaft can be designed to be comparable to a connecting rod.

Furthermore, it is conceivable that in addition a plurality of elevations running around the shaft, in particular only in sections, are provided. These can be, for example, ring-shaped or part-circular around the axis of the shaft, the elevations preferably not being formed in full. This essentially prevents the worm from slipping on the shaft, in particular in the axial direction. According to the invention, the elevations can have a bead-like design. The increases prevent the worm from being unintentionally pulled off the shaft as a result of loads.

In the context of the invention, the screw can have plastic and / or the shaft can be metal, in particular the screw can be made of plastic and the shaft can be made of metal. The screw can have, for example, polyoxymethylene (POM) or polyacetal. The screw is preferably made of plastic in order to keep the weight low and to enable simple production. However, it can also consist of metal if even higher forces are to be transmitted.

The shaft / motor shaft can be essentially round, square or, for example, octagonal.

According to the invention, it is conceivable that the sections have a height (h) between approximately 0.1 mm and approximately 5 mm. This enables simple and inexpensive production of the shaft and at the same time sufficient lever arm for power transmission.

It may be advantageous for the shaft to be connected to the worm in a material-locking and / or non-positive manner. This further improves protection against twisting and / or unintentional removal of the worm from the shaft.

Furthermore, it is conceivable that the individual elevations are V-shaped in section. The elevations are V-shaped in section in order to further improve reliable power transmission even with higher forces between the shaft of the motor and worm and or worm wheel.

Another aspect of the invention is a motor vehicle locking system, in particular a motor vehicle lock of a movable part of a vehicle with at least one motor according to the invention. Accordingly, all design features and advantages of the motor according to the invention also apply to the motor vehicle locking system according to the invention.

The engine is used in particular in an actuating unit for a motor vehicle. In particular, the motor is connected to a motor vehicle lock or installed in a motor vehicle lock in such a way that the motor can actuate, ie move, a component of the motor vehicle door lock. Especially in the case of a motor vehicle door lock, particularly problematic boundary conditions must be observed for the reasons mentioned at the outset, which can be met particularly well with the present invention.

Further measures improving the invention result from the following description of some exemplary embodiments of the invention, which are shown schematically in the figures. All of the features and / or advantages arising from the claims, the description or the drawing, including structural details, spatial arrangements and method steps, can be essential to the invention both individually and in the most varied of combinations. It should be noted that the figures are only descriptive and are not intended to limit the invention in any way.

• 1 schematisch eine erfindungsgemäße Ausführungsform eines Motors und
• 2 schematisch eine erfindungsgemäße Ausführungsform eines Kraftfahrzeugschließsystems in Form eines Kraftfahrzeugschlosses.

Show it:

• 1 schematically an embodiment of an engine according to the invention and
• 2nd schematically an embodiment of a motor vehicle locking system according to the invention in the form of a motor vehicle lock.

In the 1 is a possible embodiment of an engine according to the invention 10 shown for a motor vehicle locking system. The motor 10 points a wave 1 which is essentially round. At one end of the wave 1 are the oval sections according to the invention 2nd educated. Here are 3 sections as examples 2nd present, the sections 2nd related to the axis of rotation R are staggered. The sections are preferred and shown 2nd arranged at an angle between approximately 20 ° and approximately 90 ° to one another.

The wave 1 has a diameter of preferably 2 mm and is preferably manufactured in one piece by injection molding from plastic or metal.

The 2nd shows a possible embodiment of a motor vehicle locking system according to the invention 20 in the form of a motor vehicle lock 20 . The motor vehicle lock has a motor according to the invention 10 with a wave 1 and a snail 3rd on, the snail 3rd on the wave 1 is mounted and by means of the geometry of the shaft according to the invention 1 Power from the engine 10 to a worm wheel 24th can transfer without twisting the screw 3rd on the wave 1 happens.

Furthermore, the motor vehicle locking system 20 a ratchet with a catch 21st and a pawl 22 on to securely lock the lock holder 23 serve a moving part of a vehicle. An example is in 2nd shown that the engine according to the invention 10 for driving components of the castle 20 can serve. Here the snail drives 3rd a worm wheel 24th with the worm wheel 24th has an actuating contour, which the pawl 22 from the catch 21st can take off. So the engine serves 10 for electrically opening the motor vehicle lock 10 . The required actuation forces can now be achieved through the geometry of the shaft according to the invention 1 from the engine 10 over the snail 3rd on the worm wheel 24th transmitted without the snail 3rd on the wave 1 is twisted and therefore no power transmission from the screw 3rd on the worm wheel 24th is made possible.

Reference list

1

wave

2nd

Sections

3rd

slug

10th

engine

20

Motor vehicle locking system

21

Catch

22

Pawl

23

Lock holder

24th

Worm wheel

R

Axis of rotation

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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.

Patent literature cited

• DE 102009036834 A1 [0002]
• WO 12028120 A1 [0002]
• WO 12028121 A1 [0002]
• WO 13000454 A1 [0002]

Claims (8)

Motor (10) for a motor vehicle locking system with a shaft (1) and a worm (3) attached to the shaft (1), characterized in that the shaft (1) has at least a first and a second oval-shaped section (2), into which the worm (3) extends for a positive connection, the sections (2) being offset relative to the axis of rotation (R) of the shaft (1). Motor (10) according to the preceding claim, characterized in that the sections (2) between approximately 1 ° and approximately 180 °, preferably between approximately 20 ° and approximately 90 ° are offset from one another. Motor (10) according to one of the preceding claims, characterized in that in addition a plurality of elevations (4) are provided which rotate around the shaft (1), in particular only in sections. Motor (10) according to one of the preceding claims, characterized in that the worm (3) consists of plastic and / or the shaft (1) consists of metal. Motor (10) according to one of the preceding claims, characterized in that the sections have a height (h) of between approximately 0.1 mm and approximately 5 mm. Motor (10) according to one of the preceding claims, characterized in that the shaft (1) is integrally and / or non-positively connected to the worm (3). Motor (10) according to one of the preceding claims, characterized in that the individual elevations (2) are V-shaped in section. Motor vehicle locking system (20), in particular motor vehicle lock with at least one motor according to one of the preceding claims.

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