DOOR DRIVE DEVICE HAVING A SENSOR APPARATUS FOR MEASURING A FORCE IN THE FORCE FLOW

Abstract

It is provided a door drive device for adjusting a vehicle door relative to a vehicle body comprising an adjustment part, which can be adjusted in an adjustment direction, for transmitting force between the vehicle door and the vehicle body, a drive motor, a gear assembly which couples the drive motor to the adjustment part, and a gear housing which at least partially encloses the gear assembly. An adapter element is connected to the gear housing for fastening the door drive device to the vehicle door or the vehicle body. A sensor apparatus is used to determine a measured value which indicates a force between the vehicle door and the vehicle body.

Claims

1. A door drive device for adjusting a vehicle door relative to a vehicle body, comprising an adjustment part, which can be adjusted in an adjustment direction, for transmitting force between the vehicle door and the vehicle body, a drive motor, a gear assembly which couples the drive motor to the adjustment part, a gear housing which at least partially encloses the gear assembly, an adapter element connected to the gear housing for fastening the door drive device to the vehicle door or the vehicle body, a sensor apparatus for determining a measured value which indicates a force between the vehicle door and the vehicle body, wherein the sensor apparatus is configured to detect a change in position at least one of between the gear housing and the adapter element and between the gear housing and a component of the gear assembly in order to determine the measured value.

2. The door drive device according to claim 1, wherein the gear housing comprises a connection element which is connected to the adapter element, wherein the sensor apparatus is configured to detect a change in position between the connection element and the adapter element in order to determine the measured value.

3. The door drive device according to claim 2, wherein the adapter element comprises a first end and the connection element comprises a second end, wherein the first end and the second end are interconnected.

4. The door drive device according to claim 3, wherein the first end and the second end are interconnected for conjoint rotation.

5. The door drive device according to claim 2, wherein the adapter element and the connection element extend in parallel with one another, and their position relative to one another can be changed resiliently by the application of force.

6. The door drive device according to claim 1, wherein the gear assembly comprises a guide rail that is connected to the gear housing and a sliding element that is guided on the guide rail longitudinally in the adjustment direction is adjustable by means of the drive motor and is coupled to the adjustment part.

7. The door drive device according to claim 6, wherein the sensor apparatus is configured to detect a change in position between the gear housing and the guide rail in order to determine the measured value.

8. The door drive device according to claim 6, wherein the guide rail is resiliently movable relative to the gear housing transversely to the adjustment direction.

9. The door drive device according to claim 6, wherein the adapter element is arranged on the end face of the guide rail.

10. The door drive device according to claim 1, wherein the adapter element extends transversely to the adjustment direction.

11. The door drive device according to claim 1, wherein the adapter element comprises an opening through which the adjustment part extends and in which the adjustment part is movable in the adjustment direction.

12. The door drive device according to claim 1, wherein the gear assembly comprises a spindle that can be rotated about a rotational axis and can be driven by the drive motor, wherein the sliding element is in a threaded connection to the spindle and is adjustable longitudinally in the adjustment direction by rotating the spindle.

13. The door drive device according to claim 12, wherein the sliding element comprises a spindle nut portion having a threaded opening formed thereon, wherein the spindle engages in the threaded opening.

14. The door drive device according to claim 1, wherein the gear assembly comprises a gear wheel mounted on the gear housing for transmitting force from the drive motor to the spindle.

15. The door drive device according to claim 1, wherein the sensor apparatus comprises a strain gauge, an electrical coil or a piezoelectric sensor for detecting the change in position.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The concept underlying the solution will be explained in greater detail in the following with reference to exemplary embodiments shown in the drawings.

[0047] FIG. 1 is a schematic view of a vehicle door on a vehicle body, comprising an adjustment part in the form of a thrust element that is arranged on the vehicle body in an articulated manner and is moved relative to the vehicle door when the vehicle door is pivoted.

[0048] FIG. 2 is a view of an exemplary embodiment of a door drive device for adjusting a vehicle door.

[0049] FIG. 3 is an exploded view of the door drive device.

[0050] FIG. 4 is another view of the door drive device, from the side.

[0051] FIG. 5 is a top view of the door drive device.

[0052] FIG. 6 is an end-face view of the door drive device.

[0053] FIG. 7 is the view according to FIG. 4, but with the adjustment part extended.

[0054] FIG. 8 is the view according to FIG. 5, with the adjustment part extended.

[0055] FIG. 9 is the view according to FIG. 6, with the adjustment part extended.

[0056] FIG. 10 is a partial sectional view of the door drive device, with the adjustment part retracted.

[0057] FIG. 11 is the view according to FIG. 10, but with the adjustment part extended.

[0058] FIG. 12 is a separate side view of a sliding element of a gear assembly of the door drive device.

[0059] FIG. 13 is a plan view of the sliding element.

[0060] FIG. 14 is an end-face view of the sliding element.

[0061] FIG. 15 is a perspective view of the sliding element.

[0062] FIG. 16 is a side view of a gear assembly of the door drive device.

[0063] FIG. 17 is a plan view of the gear assembly.

[0064] FIG. 18 is an end-face view of the gear assembly.

[0065] FIG. 19 is a perspective view of the gear assembly.

[0066] FIG. 20 is a view of an exemplary embodiment having a sensor apparatus for detecting a change in position between a gear housing and a guide rail for guiding a sliding element.

[0067] FIG. 21 is a view of an exemplary embodiment having a sensor apparatus for detecting a change in position at an adapter element, by means of which the drive device can be fixed to a vehicle door.

DETAILED DESCRIPTION

[0068] FIG. 1 is a schematic view of a vehicle 1 comprising a vehicle body 10 and a vehicle door 11 which is arranged on the vehicle body 10 so as to be articulated about a door hinge 111 and can be pivoted relative to the vehicle body 10 in an opening direction O in order to open or close a door opening.

[0069] A door drive device 2, which comprises an adjustment part 21 in the form of a thrust element and is used to adjust the vehicle door 11 relative to the vehicle body 10, acts between the vehicle body 10 and the vehicle door 11. The adjustment part 21 in the form of the thrust element is arranged so as to be articulated about a joint 20 on the vehicle body 10, for example on the A pillar of the vehicle 1, and moves relative to the vehicle door 11 when the vehicle door 11 is pivoted. Here, one end 211 of the adjustment part 21 projects into a door interior space 110 of the vehicle door 11 and moves in this door interior space 110 when the vehicle door 11 is adjusted.

[0070] FIGS. 2 to 19 show views of an exemplary embodiment of a door drive device 2 which serves to adjust an adjustment part 21 and thus to move a vehicle door 11 relative to a vehicle body 10.

[0071] In the exemplary embodiment shown, the door drive device 2 comprises an electromotive drive motor 22, which serves to drive a spindle 25 of a gear assembly of the door drive device 2, which spindle can be rotated about a rotational axis D. The drive motor 22 comprises a motor shaft 220 and a worm gear 221 arranged thereon comprising worm gearing, which meshes with a gear wheel 230 in the form of a spur gear of a gear 23.

[0072] The gear wheel 230 is arranged on a shaft 233 and is connected to a portion 250 of the spindle 25 via the shaft 233 for conjoint rotation such that the gear wheel 230 is fixed to the spindle 25 for conjoint rotation.

[0073] The gear wheel 23 is mounted so as to be rotatable about the rotational axis D of the spindle 25 relative to a gear housing 24 by means of bearings 231, 234. As shown in particular in the partial sectional views according to FIGS. 10 and 11 when considered together with the exploded view according to FIG. 3, a bearing 231 is received in a bearing bush 232 and is supported thereby in a bearing opening 240 in the gear housing 24. By contrast, another bearing 234 lies in a portion 245 of the gear housing 24 and provides support for the shaft 233 on an end of the shaft 233 remote from the bearing 231.

[0074] The door drive device 2 comprises a sliding element 26 and a guide rail 27. As shown in particular in the exploded view according to FIG. 3, the guide rail 27 is received in a receiving opening 246 in the gear housing 24 and is rigidly connected to the gear housing 24 by means of flange portions 273.

[0075] The sliding element 26 slides in the guide rail 27 such that the sliding element 26 can be adjusted longitudinally on the guide rail 27 in an adjustment direction V. The guide rail 27 has, in the cross section transverse to the adjustment direction V, a C shape, formed by a base 270 and legs 271 extending on the base 270 at an angle to the base 270, the edges 272 of which legs remote from the base 270 are bent such that they point towards one another. The sliding element 26 is guided in the guide rail 27 such that the sliding element 26 is received between the legs 271 and is enclosed at its periphery by the base 270, the legs 271 and the bent edges 272.

[0076] In the exemplary embodiment shown, the guide rail 27 is formed as a metal bent panel part and is rigidly connected to the gear housing 24 by means of an adapter element 242 and the flange portions 273 abutting the gear housing 24 (see in particular FIG. 2 and FIGS. 4 to 6). The adapter element 242 is connected to the gear housing 24 by means of fastening elements 243 in the form of screws, wherein the flange portions 273 are interposed, and can be fixed to a structural portion of the vehicle door 11, for example to an inner door panel portion, by means of fastening elements 244 in the form of screws such that the door drive device 2 is fixed in the vehicle door 11.

[0077] The adapter element 242 serves to fix the drive device 2 to the vehicle door 11, in particular the inner door panel of the vehicle door 11, such that the drive device 2 is arranged inside a door interior space of the vehicle door 11. The adapter element 242 thus produces an interface, which is adapted in a customer-specific manner and thus makes it possible to attach the drive device 2 to the vehicle door 11 of a particular vehicle model.

[0078] The adapter element 242 is arranged on the end face of the guide rail 27 and extends in a planar manner transversely to the adjustment direction V, in which the sliding element 26 together with the adjustment part 21 arranged thereon can be moved towards the guide rail 27. The adjustment part 21 extends through an opening 242A in the adapter element 242, is guided out of the door interior space through the opening 242A and is supported on the vehicle body 10 by means of the joint 20.

[0079] The sliding element 26 comprises a structural part 260, which is formed as a metal bent panel part and comprises a base 261 and legs 262 angled towards the base 261. Edges 267 of the legs 262 are bent towards one another, wherein portions 268 adjoining the edges 267 are in an upright position such that they point away from the base 261, as shown in FIG. 15, for example.

[0080] The structural part 260 is overmolded with plastics material in part, by means of which sliding portions 263 are formed on the outside of the legs 262, by means of which sliding portions the sliding element 26 is in sliding contact with the guide rail 27. A coupling element 266 in the form of a ball head is formed integrally with the sliding portion 263, is arranged between the legs 262 of the structural part 260 and serves to couple the sliding element 26 to the adjustment part 21 in an articulated manner. For this purpose, an end 211 of the adjustment part 21 is arranged on the coupling element 266 and is connected to the sliding element 26 in an articulated manner thereby, as shown by the views of the gear assembly according to FIGS. 16 to 19, for example. Owing to the spherical shape of the coupling element 266, the adjustment part 21 is connected to the sliding element 26 so as to be articulated about the adjustment direction V and also about the axes perpendicular to the adjustment direction V, such that tolerances in the position of the adjustment part 21 relative to the sliding element 26 can be compensated for.

[0081] In addition, a spindle nut portion 264 is integrally formed with the sliding portion 263. The spindle nut portion 264 is formed on the upright portions 268 of the structural part 260 and comprises a threaded opening 265 having an inner thread formed therein. The spindle 25 comprising a threaded portion 251 engages in the threaded opening 265, such that the spindle 25 is in threaded engagement with the spindle nut portion 264 of the sliding element 26 by means of an outer thread formed on the outside of the threaded portion 251.

[0082] As shown by FIG. 3 when considered together with FIG. 10, a cover element 241 is arranged on the gear housing 24 which covers the guide rail 27 on the side of the edges 272 and thus encloses the spindle nut portion 264 of the sliding element 26 towards the outside along the movement path predetermined by the guide rail 27.

[0083] The adjustment part 21 is coupled at one end 210 to a joint 20 so as to be articulated about a joint axis G by means of a joint pin 200, which joint is rigidly connected to the vehicle body 10, as shown schematically in FIG. 1. The adjustment part 21, however, is coupled to the sliding element 26 in an articulated manner at the end 211 remote from the end 210. By adjusting the sliding element 26, driven by the drive motor 22, the end 211 of the adjustment part 21 can be moved in the guide rail 27 such that the adjustment part 21 can be adjusted between a first, retracted position (FIGS. 4 to 6 and FIG. 10) and a second, extended position (FIGS. 7 to 9 and FIG. 11), in order to move the vehicle door 11 relative to the vehicle body 10 and adjust it between a closed position (corresponding to the retracted position of the adjustment part 21) and an open position (corresponding to an extended position of the adjustment part 21).

[0084] As shown in the partial sectional view according to FIG. 10, the sliding element 26 is further away from the gear housing 24 in the first, retracted position and is closer to an end of the guide rail 27 remote from the adapter element 242. In the second, extended position, however, the sliding element 26 is moved towards the gear housing 24 such that the spindle nut portion 264 comes closer to the gear 23 and the end 211 of the adjustment part 21 is moved towards the adapter element 242 in the adjustment direction V.

[0085] In the second position, the sliding element 26 together with the structural part 260 dips under the gear 23 by the sliding element 26, when viewed in the adjustment direction V, coming into axial overlap with the gear housing 24 and the gear 23 received therein, as shown in FIG. 11. This allows for a construction of the drive device 2 that is efficient in terms of installation space and has a comparatively great amount of travel of the adjustment part 21 in the adjustment direction V and a low installation height transverse to the adjustment direction V, in particular perpendicularly along the joint axis G.

[0086] As shown in FIG. 9, a longitudinal axis L about which the motor shaft 22 of the drive motor 22 can be rotated is arranged obliquely to the joint axis G about which the adjustment part 21 is connected to the joint 20 in an articulated manner at the end 210. This can contribute to a saving in terms of installation space, in particular in the transverse direction (transverse to the joint axis G and transverse to the adjustment direction V).

[0087] The drive device 2 can be installed in a vehicle door 11 with the drive motor 22 pointing upwards, but alternatively also with the drive motor 22 pointing downwards. Here, the drive motor 22 can also be arranged at an end of the guide rail 27 that is remote from the end of the guide rail 27 at which the adjustment part 21 emerges from the guide rail 27. In this way, the drive device 2 can be used universally on different door models of different vehicles.

[0088] In the drive device 2, for adjusting the vehicle door 11 relative to the vehicle body 10, the adjustment part 21 is adjusted by displacing the sliding element 26 on the guide rail 27 in the adjustment direction V by means of the drive motor 22. A force flow arises between the vehicle door 11 and the vehicle body 10 which flows from the vehicle door 11, through the adapter element 242, the gear housing 24, the drive wheel 23, the spindle 25, the sliding element 26 and the adjustment part 21 to the vehicle body 10. For the adjustment, a force is induced in the sliding element 26 by means of the drive motor 22 in this case, and this moves the sliding element 26 on the spindle 25 such that the adjustment part 21 is adjusted and the vehicle door 11 is thus pivoted relative to the vehicle body 10.

[0089] In order to measure the force in the force flow between the vehicle door 11 and the vehicle body 10 as part of a servo function, for example, in the exemplary embodiment according to FIG. 20, a sensor apparatus 28 is provided which serves to measure a change in position of the guide rail 27 (which is a component of the gear assembly of the drive motor 2) relative to the gear housing 24. For this purpose, the sensor apparatus 28 is arranged to be stationary on the gear housing 24 and comprises a coil 281 which is connected to an evaluation unit 280 in the form of an inductance-to-digital converter (LDC). The evaluation unit 280 is in turn connected to a control unit 3, which can be formed internally on the drive motor 2 or is coupled to the drive motor 2 by means of a plug connector 29 as an external control unit.

[0090] The coil 281 is arranged to be stationary on the gear housing 24 and is associated with a counter element 274 in the form of an electrically conductive panel element on the guide rail 27. When the guide rail 27 moves, the counter element 274 is deflected together with the guide rail 27 and is moved relative to the coil 281 as a result, which results in a change in inductance at the coil 281, which can be evaluated by the evaluation unit 280 and indicates a change in position of the guide rail 27 relative to the gear housing 24.

[0091] In operation, a force is exerted on the sliding element 26 in particular in the adjustment direction V by means of the adjustment part 21. Here, the coupling element 266 establishes the coupling to the adjustment part 21 and is vertically arranged at a distance from the spindle 25 in a vertical direction such that a force acts on the sliding element 26 (approximately) in parallel with the spindle 25, but so as to be vertically offset from the spindle 25. Owing to this application of force, an adjustment movement results in (slight) tilting of the sliding element 26 relative to the spindle 25 and thus in a change in position of the guide rail 27 in particular in the vertical direction relative to the gear housing 24.

[0092] This change in position can be detected by the sensor apparatus 28. Here, the change in position is correlated with the force in the force flow between the vehicle door 11 and the vehicle body 10 such that, on the basis of the change in position, a conclusion can be drawn on the force in the force flow, for example on the basis of a suitable calibration.

[0093] Sensor signals from the sensor apparatus 28 can be accordingly evaluated by the control apparatus 3 and can be used for regulating the drive motor 22, for example for providing a motor-assisted adjustment force as part of a servo function.

[0094] In the exemplary embodiment according to FIG. 20, the guide rail 27 is resiliently adjustable, in particular in the vertical direction relative to the gear housing 24 on which the sensor apparatus 28 is rigidly arranged. The guide rail 27 is connected to the gear housing 24 and the adapter element 242 at its end-face front end, but is not fixed to the gear housing 24 at a remote, rear end, such that the guide rail 27 can be deflected in the manner of a bending beam relative to the gear housing 20 when under load.

[0095] In another exemplary embodiment shown in FIG. 21, in a modification to the previously described exemplary embodiments, the adapter element 242 is connected to a connection element 247 in the manner of a bending beam. The connection element 247 is a component of the gear housing 24 and is rigidly connected to a housing portion of the gear housing 24. A connection of the gear housing 24 to the adapter element 242 is thus produced by the connection element 247.

[0096] In the exemplary embodiment according to FIG. 21, the adapter element 242 comprises a first end 248 and the connection element 247 comprises a second end 249. The ends 248, 249 of the adapter element 242 and the connection element 247 are connected for conjoint rotation, for example by a rivet element or a screw, such that the connection element 247 is clamped to the adapter element 242, but can be deflected here under elastic deformation relative to the adapter element 242.

[0097] For instance, the adapter element 242 and the connection element 247 each extend in parallel with one another transversely to the adjustment direction V, wherein the connection between the adapter element 242 and the connection element 247 only is produced by the ends 248, 249 and the connection element 247 comprising the gear housing 24 arranged thereon can thus be deflected approximately in the adjustment direction V relative to the adapter element 242.

[0098] A defined bend line can be formed on the adapter element 242 and/or the connection element 247 for example by a thinned material portion in order for the adapter element 242 and the connection element 247 to be deflected relative to one another.

[0099] In the exemplary embodiment according to FIG. 21, a sensor apparatus 28 in the form of one or more strain gauges is arranged on the adapter element 242 and/or the connection element 247, for example in a transition region between the adapter element 242 and the connection element 247, in order to detect a deformation at the adapter element 242 and/or the connection element 247 and to thus make a force measurement possible. Sensor signals from the sensor apparatus 28 are supplied to an internal or external control apparatus 3, which evaluates the signals and thus determines a force in the force flow of the drive device 2.

[0100] Because the sensor apparatus 28 is integrated directly in the door drive device 2 both in the exemplary embodiment according to FIG. 20 and in the exemplary embodiment according to FIG. 21, the sensor apparatus 28 does not contribute to the installation space in the drive device 2, or at least only contributes to it to a negligible extent. The sensor apparatus 28 allows for a reliable, precise force measurement in the force flow while requiring only a small amount of additional installation space in the drive device 2.

[0101] The concept underlying the solution is not limited to the exemplary embodiments previously set out, but can also be implemented in completely different kinds of embodiments.

[0102] A door drive device of the kind described can in particular be used on a vehicle side door as well as on a tailgate. A door drive device of the kind described can for example also be used to adjust a bonnet or a so-called frunk (i.e. a lid of a front luggage space of a vehicle), which should also be understood to mean vehicle doors in the context of the present text.

LIST OF REFERENCE NUMERALS

[0103] 1 Vehicle [0104] 10 Body [0105] 11 Vehicle door [0106] 110 Door interior space [0107] 111 Door hinge [0108] 2 Door drive device [0109] 20 Joint [0110] 200 Joint pin [0111] 21 Adjustment part (thrust element) [0112] 210, 211 End [0113] 22 Drive motor [0114] 220 Motor shaft [0115] 221 Worm gear [0116] 23 Gear [0117] 230 Gear wheel [0118] 231 Bearing [0119] 232 Bearing bush [0120] 233 Shaft [0121] 234 Bearing [0122] 24 Gear housing [0123] 240 Bearing opening [0124] 241 Cover element [0125] 242 Adapter element [0126] 242A Opening [0127] 243, 244 Fastening element [0128] 245 Portion [0129] 246 Receiving opening [0130] 247 Connection element [0131] 248, 249 End [0132] 25 Spindle [0133] 250 Portion [0134] 251 Threaded portion [0135] 26 Sliding element [0136] 260 Structural part [0137] 261 Base [0138] 262 Leg [0139] 263 Sliding portion [0140] 264 Spindle nut portion [0141] 265 Threaded opening [0142] 266 Coupling element [0143] 267 Edges [0144] 268 Upright portion [0145] 27 Guide rail [0146] 270 Base [0147] 271 Leg [0148] 272 Edges [0149] 273 Flange portion [0150] 274 Counter element (electrically conductive panel element) [0151] 28 Sensor apparatus [0152] 280 Evaluation unit [0153] 281 Coil [0154] 29 Plug connector [0155] 3 Control apparatus [0156] D Rotational axis [0157] G Joint axis [0158] L Longitudinal axis [0159] Opening direction [0160] V Adjustment direction