KR20200012919A - Car Drive - Google Patents

Abstract

The invention has in particular a housing 3 consisting of a housing shell 2 and a housing cover, an electric drive 4 used to move the actuation means 6, the actuation means 6 having at least a spindle drive 4. , 12, 13, and the spindle 5 can be supported by the bearing retainer 18 under preload. The preload can be generated by a spring element 19 which can be inserted into the housing 3.

Description

Car Drive

The invention comprises in particular a control means movable by an electric drive, an electric drive, a housing consisting of a housing shell and a housing cover, the control means being at least movable by a spindle drive, the spindle being under pretension. It is possible to be supported in a bearing receptacle.

Such actuating drives are preferably used for performing control operations in the vehicle. In this case, the actuation drive can be integrated into or interact with the vehicle latch, for example. It can also be appreciated that the actuating drive moves the control means, for example to lock the fuel cap or storage compartment or cover. Control means are thus used where movements in the vehicle must be initiated and made. In this case, traction or pressure may act on the control means depending on the application and arrangement on or in the vehicle. For example, the control means may interact with a Bowden cable such that, for example, a pulling movement can be generated in the vehicle latch. Depending on the application, the traction and pressure that may be generated by the intervention of the electric drive alternatively act on the control means and thus on the spindle drive.

Various troubleshooting approaches are known to ensure a sufficient amount of play when mounting the spindle of the spindle drive so that the spindle can be mounted with the smallest possible amount of friction loss and at the same time ensure that the spindle is firmly mounted in the working drive. have. These problem solving approaches are characterized by reducing friction or bearing losses in the bearing receptacles of the components being moved while the components being moved are mounted with as little play as possible.

EP 0 133 527 B2 discloses a device, whereby the shaft or drive shaft of the micro drive can be mounted slidably. The tip of the motor shaft is mounted in a disk which can in fact be considered to be an axial stop at the same time.

DE 10 2013 007 272 A1 discloses a microdrive which houses a microdrive and a worm gear and has a housing consisting of a housing box and a housing cover, wherein the motor shaft of the microdrive is supported in the housing by the bore of the bearing and is axially oriented. It is fixed there by a stop. To minimize friction in the bearing receptacle, the motor shaft includes a tip that interacts with the axial stop. In this example, the axial stop is formed by the housing cover, and the axial stop has a cavity for receiving the corresponding tip of the motor shaft. The corresponding portion of the axial stop also includes a longitudinal gap, whereby the corresponding axial movement of the motor housing can be elastically supported.

WO 2015/036837 A1 discloses a drive unit to be used in an automobile, in particular in a vehicle door latch or in combination with a vehicle door latch, which comprises a housing and a motor and an associated motor shaft. The drive unit is provided with at least one spring element at one end of the motor shaft, which spring element generates an axial force and the spring element is disposed in at least one receptacle in the housing. The spring element is substantially T-shaped when viewed from above and is provided with an end plate and two protrusions on both sides, the end plate acting on the motor shaft and at least the protrusions being arranged in the receptacle of the housing. When the drive unit is viewed from above, the two projections are arranged mainly transverse to the motor shaft with an end plate extending therebetween; The end plate thereby abuts the end face of the motor shaft under pretension.

In the comprehensive document DE 10 2007 021 268 A1, the spindle is accommodated in axial and radial bearings and the bearing receptacles are arranged in the housing so as to be movable. In addition, an elastic element is provided on the housing, which protrudes into the interior of the housing and acts on the bearing receptacle under pretension so that the receptacle is pretensioned in the direction of its intended position within the housing. The prior art is not clear with regard to mounting the spindle without play. In particular, these solutions are partly complex and are linked, for example, by complex laser welding methods. This is the starting point of the present invention.

It is an object of the present invention to mount a spindle in a working drive in an improved manner. In particular, it is an object of the present invention to provide a flexible spring element with a simple design and easy to assemble to ensure that the play is reliably compensated at different loads and / or at different temperatures.

This object is manifested by the features of independent claim 1. Advantageous embodiments of the invention are specified in the dependent claims. The illustrative embodiments described below are not limiting, and it is emphasized that any possible variations of the features described in the description of the invention and the dependent claims are possible.

According to claim 1, the object of the invention is achieved in that an actuating drive is provided for the vehicle, in particular a control means movable by a housing, an electric drive, an electric drive made of a housing shell and a housing cover. It is possible for the control means to be movable by at least the spindle drive and to generate pretension by a spring element which can be inserted into the housing. The design of the actuating drive according to the invention makes it possible to put the spindle of the actuating drive under pretension, wherein the spring element can be inserted or introduced into the housing as a separate component. As a result of the separate spring elements, the spring elements can be adapted to the individual requirements and thus flexibly adapted to the requirements of the actuating drive. In particular, therefore, various spring constants can be made and / or the play can be compensated for different angles, which makes it possible to use a working drive for various applications, while at the same time a sufficient play of the play for the spindle. Alternatively, it is possible to obtain a sufficient amount of pretension.

As a result of the possibility of introducing or replacing the spring element into the housing, it is also possible to assemble the spring element independently of the additional components of the spindle and the actuating drive, which, on the one hand, makes maintenance work easier and on the other hand It is possible to adapt the spring element to the requirements of the actuating drive. In this case, different spring elements can be used, for example, depending on the application, ie depending on the required pretension, and the individual spring elements can be assembled. Thus the spring element can be adapted.

Operational drives are used in vehicles, for example, where they require movement on or in the vehicle. Thus, the actuating drive can be used, for example, as a pull drive to the vehicle latches, where the spindle moves the control means, which in turn interacts with, for example, the Bowden cable or is directly connected to the lever mechanism of the pull drive. However, actuation drives can also be used at points where simple control movements are required. For example, actuating drives can be used to close hinged lids or hoods. Preferred applications are gas flap closures. However, the back sheets or flaps or covers may also be locked to prevent theft.

The actuating drives comprise a housing which is preferably formed as plastic injection molded components. The housings are preferably made of a housing shell and a housing cover. Component parts of an actuating drive, such as a motor switch, an electric motor, are inserted into the housing shell, for example, which housing is also possible to be used to receive additional fastening means. The housing is sealed by a housing cover, preferably in a watertight manner. At the same time, the housing cover can also be used to fix additional components, or for example as a bearing shell for control means, spindle or shaft.

In a preferred embodiment, the housing cover may also be used to firmly position the spring element. In this case, the molded parts and / or extensions on the housing cover may interact with the molded parts, raised parts and / or extensions of the housing shell, thus for example forming bearing points or fixing points. Can be. The housing cover preferably comprises at least one raised portion and / or extension, which can be engaged with the housing shell such that the spring element can be fixed inside the housing. This ensures that the spring element is specifically mounted inside the housing. The housing cover may at the same time be used to orient the spring element inside the housing such that the spring element is specifically oriented and thus functions reliably.

The electric drive is preferably used as an electric drive. In this case, DC motors with counterclockwise and clockwise rotation are preferably used, as used in conventional vehicles and in particular operational drives. In this case, the electric drive can interact with the worm gear, for example, and it is possible that at least part of the worm gear is formed integrally with the spindle. In this case, the worm is placed on the drive shaft of the motor that engages the worm wheel of the spindle and thus transmits torque to the spindle. By counterclockwise and clockwise rotation, the control means arranged on the spindle can be moved.

Of course, depending on the movement to be made, namely the path and the force to be produced, it is also possible to directly couple the transmission to the drive of the electric drive and indirectly drive the spindle. The spindle or spindle drive moves the control means. The control means can be assembled directly on the spindle of the spindle drive, but it can also be appreciated that the spindle drive is subsequently coupled to the lever, which for example forms part of the pull drive.

A common feature of all of these actuation drives is that the actuation drive is placed under different requirements. The spindle is intended to be positioned with as little play as possible, while at the same time a low noise movement is obtained. In addition, the actuating drive undergoes a temperature change, which in turn affects expansion, and therefore tolerance, in the actuating drive, especially when the actuating drive is formed largely of plastic components. Thus, it is intended to be able to produce a play without movement of the spindle, and at the same time intended to be able to compensate for the tolerances. By using spring elements, pretension can be created on the spindle so that the spindle remains under pretension and can react to changes in temperature and the load exerted by the drive. The design of the spring element according to the invention allows a sufficient amount of pretension to be obtained under different environmental conditions at any point in time while at the same time introducing as little friction as possible to ensure low frictional movement of the spindle. have.

In a preferred embodiment of the invention, one advantage is obtained when at least one axial end of the spindle is supported in a bearing receptacle to compensate for axial play. In this case, a hole in the housing can be used as a bearing receptacle, into which the axial end of the spindle can be introduced. It is essential here in the present invention that at least part of the axial end protrude out of the bearing receptacle, or that the axial end be laid free so that the spring element can interact with the axial end of the spindle. In particular, by means of the spring element a force can be introduced to the spindle in the axial direction. At least one spring element is preferably arranged at one axial end of the spindle. However, the spring element may be arranged at each of the axial ends of the spindle. It can also be appreciated that the axial end of the spindle is inserted into the connecting piece of the housing, in which a groove or hole is made in the connecting piece so that the spindle end can be mounted to the connecting piece and / or the connecting piece and the housing cover. It is possible. In this case, the axial force can be introduced to the spindle by the spring element at any point in time.

The spring element is preferably made of spring steel. Designing the spring element into spring steel and designing it as a separate component is advantageous in that the pretension can be reliably generated during its service life. In addition, suitable spring pretension can be obtained by selection of the material. In addition, the metal is malleable, which in turn makes it possible and easy to adapt the spring element to the conditions in the actuating drive.

The spring element can advantageously be formed as a strip of metal foil. Strips of thin metal sheets are cheap to manufacture and can be adapted to the spindle or the axial end of the spindle. In addition, forming and adapting strips of thin metal sheet can be easily adapted to geometric installation conditions inside the housing. Designing the spring element as a strip of thin metal sheet is also advantageous in that it is possible to ensure that the assembly is reliable at the same time. The assembly can be reliably formed by forming the spring element into an elongated strip of metal sheet disposed transverse to the axis, ie extending in the direction of the housing shell, so that incorrect assembly of the spring element can be ruled out. . This increases the assembly reliability and thus the quality of the working drive.

In another embodiment, the strip of metal sheet comprises at least one part shaped in the direction of the spindle, which makes it possible to engage the shaped part with the spindle, in particular the shaft end of the spindle. As a result of the shape made on the strip of metal sheet, it is possible to form a strip of sheet metal by making it possible to compensate for play and to support the spindle under pretension by deforming the strip of sheet metal. In particular, as a result of the shape made on the strip of metal foil, the spring constant of the strip of metal foil can be adapted, and the shaped part increases the strength of the strip of metal foil.

The strip of metal foil is preferably deformed in the direction of the spindle from the housing receptacle so that a strip of metal foil can be made which can be characterized as being bridged. The strip of metal sheet is preferably in contact with the spindle end by a plane. In this case, the strip of metal sheet may cover the entire shaft end.

It may also be advantageous for the strip of metal foil to comprise at least one additional angle of bend, in particular an additional bend edge in the end region of the strip of metal foil. By providing the strip or spring element of the metal sheet with a plurality of molded parts and / or bending edges, it is possible to firmly position the spring element inside the housing. In this case, the bend edges at the respective ends of the strip of metal sheet can be used to create a positive fit between the housing and the spring element. The combination of the bent edges and the molded part can thus produce a cross-sectional shape of the strip of metal sheet which is described as being M-shaped, which allows the strip of metal sheet to be firmly positioned and mounted inside the housing and free It allows the tension to be introduced into the spindle.

In this case, the molded part can advantageously be used to create a pretension and at the same time compensate for the play if the spindle undergoes longitudinal expansion, for example due to temperature differences. This thus ensures that the spindle is firmly received in the housing and assembled in the housing under pretension at any given point in time. Thus, it is possible to ensure that the spindle is firmly mounted and the bearing noise can be reduced at the same time. By an advantageous embodiment of the strip of metal sheet, a minimum amount of bearing friction can also be produced between the strip of metal sheet and the spindle.

According to one advantageous embodiment of the invention, the spring elements can be interlocked with the housing. The sliding fit between the spring element and the housing preferably takes place at the radial ends of the strip of thin metal sheet. For this purpose, the strip of housing and / or sheet metal can have a corresponding shape and / or can comprise fastening elements, for example, by which the strip of sheet metal can be clipped to the housing, for example. However, it can also be appreciated that the strip of metal sheet is insertable into the housing by fit, in particular an interference fit, in order to ensure that the strip of metal sheet is firmly fixed inside the housing.

According to another preferred embodiment, the spring element can be inserted into the housing shell and fixed in place by the housing cover. Insertion of the spring element is facilitated by a spring element that can be introduced into the housing with play. If a strip or spring element of metal sheet is introduced into the housing or housing shell, in particular to be still gripped by the operator, manual assembly and simple assembly can thus be ensured. The spring element is then fixed in place by the housing cover. In this case, the housing cover may then receive the spring elements in interlocking engagement with each other and / or place it inside the housing such that the spring element takes its fixed end position only after the housing cover is firmly connected to the housing shell. For this purpose, the strip of metal foil and / or the housing shell can be made to interlock with the housing cover.

According to another advantageous embodiment of the invention, the width of the strip of thin metal sheet is equal to or greater than the diameter of the shaft end of the spindle. As a result of the width of the strip of metal sheet that corresponds at least to the diameter of the shaft end in contact with the strip of metal sheet, it is possible to ensure that the shaft ends lie over the entire strip of metal sheet. As a result of the shaft end lying on the entire strip of metal sheet, force can be transmitted evenly between the shaft end and the spring element. It should be taken into account here that the shaft end may for example be conical, ie tapered, in order to create as little friction as possible between the shaft end and the pretension strip of the metal sheet. The strip of metal foil is preferably made of spring steel so that a small amount of frictional loss can be taken as a result of the material combination of the plastic spindle and the steel strip of metal foil. As a result of the design of the spring element according to the invention, it is possible to ensure that the spindle is reliably pretensioned by simple design means.

The invention will be described in more detail below on the basis of preferred exemplary embodiments with reference to the attached drawings. However, the principle is that the exemplary embodiments do not limit the invention, but represent only one embodiment. The features shown may be performed individually or in combination with other features of the description and claims.

1 is a three-dimensional plan view of an actuating drive that does not include a housing cover and includes an electrically driven spindle and control means;
2 is a detailed view of an actuating drive formed in accordance with the invention, including a spring element acting on the shaft end of the spindle.

1 shows the actuating drive 1 in a three-dimensional view of the housing shell 2. The housing 3 is shown without a housing cover for the purposes of the present invention. The actuating drive 1 comprises an electric drive 4, a spindle 5, a control means 6, a micro switch 7, a bowden cable 8, an electrical contact 9 and an elastic fastening means 10. The elastic fixing means 10 is assembled to the extension part 11 of the housing shell 2. The spindle 5 comprises a worm wheel 12 integrally formed on the spindle 5, which interacts with a worm assembled to the drive shaft 13 of the electric drive 4.

The worm wheel 12 is in both directions of movement by the electric drive 4 such that the control means 6 and thus the bowden cable 8 can be moved along the spindle 5 in the direction of the arrow p. Can be driven. The movement of the control means 6 can be detected by the micro switch 7. The electrical contacts 9 for the micro switch 7 and the electrical drive 4 can be connected, for example, by an electrically conductive path integrated in the housing shell 2, the connector 15 being in contact with the electrically conductive path 14. It is possible.

The axial end 16 of the spindle 5 is housed in a bearing 18 formed as a rib 17. Ribs 17 and bearing points 18 on the axial end 16 of the spindle 5 are integrally formed with the housing shell 2 in this example. The axial end 16 is in contact with the spring element 19 shown in FIG. 2 under pretension.

The spring element 19 is inserted in engagement with the housing shell 2. In this example, the spring element 19 comprises shaped parts 20, which extend in a flat manner in the bearing area 21, so that the flat surface 21 is provided so that the axial end 16 abuts. do. Bend edges are provided at the lateral ends 22, 23 of the strip 19 of the metal sheet, which make it possible to firmly fix the spring element 19 to the housing shell 2. The sliding fit is received in mutual engagement with the housing shell 2 as a result of the raised portions 26, 27. The raised portions 26, 27, the molded portion 20 and the bent edges 24, 25 enable the spring element 19 to be firmly supported in the housing shell. At the same time, the spring element 19 is fixed in the housing shell 2 so that pretension can be introduced into the spindles 5.

If the spindle 5 expands as a result of heating, the spindle 5 expands in the direction of arrow P1. This expansion is received by the spring element and the spindle 5 is firmly mounted in the actuating drive 1 at the same time.

1 operating drive 2 housing shell
3 housing 4 electric drive
5 spindles 6 control means
7 micro switch 8 boden cable
9 Electrical contacts 10 Elastic fixing means
11 Extension 12 Worm Wheel
13 Drive shaft 14 Electrical conduction path
15 connector 16 axial end
17 rib 18 bearing
19 Spring elements 20 Molded parts
21 bearing area, flat surface 22, 23 lateral ends
24, 25 Bend corners 26, 27 Raised parts
P arrow P1 arrow

Claims (10)

A vehicle actuated drive 1 comprising, in particular, a housing 3 made of a housing shell 2 and a housing cover, an electric drive 4, a control means 6 which can be moved by the electric drive 4, and control The means 6 can be moved by at least the spindle drives 4, 12, 13 and it is possible for the spindle 5 to be supported on the bearing receptacle 18 under pretension, with the pretension being inserted into the housing. Actuated drive 1, characterized in that it can be produced by a spring element 19. The actuating drive (1) according to claim 1, characterized in that at least one axial end (16) of the spindle (5) is supported in the bearing receptacle (18) so as to compensate for axial play. 3. The actuating drive (1) according to claim 1, wherein the spring element (19) is made of spring steel. 4. The actuating drive (1) according to claim 1, wherein the spring element (19) can be formed as a strip (19) of metal foil. 5. The strip 19 of metal foil comprises at least one shaped part 20 in the direction of the spindle 5, the shaped part 20 being connected to the spindle 5, in particular the spindle 5. Actuated drive 1, characterized in that it is possible to engage the shaft end 16. 6. The additional bending according to claim 4, wherein the strip of metal foil 19 is at least one additional bend edge 24, 25, in particular at the end regions 22, 23 of the strip 19 of metal foil. Actuated drive (1), characterized in that it comprises corners (24, 25). 7. The actuating drive (1) according to claim 1, wherein the spring elements (19) can be interlocked into the housing (3). 8. 8. The actuating drive (1) according to claim 1, wherein the spring element (19) can be inserted into the housing shell (2) and fixed in place by the housing cover. 9. 9. The actuating drive (1) according to claim 4, wherein the width of the strip (19) of the thin metal sheet is equal to or greater than the diameter of the shaft end (16) of the spindle (5). . 10. The actuating drive (1) according to any one of the preceding claims, wherein the spring element (19) can be fixed by a bearing cover.

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