Door drive device for electromotively moving a vehicle door

Abstract

A door drive device (2) for electromotively moving a vehicle door (11) comprises an electric motor (20); a transmission (21) which can be driven by the electric motor (20) and which has a planetary transmission stage (23) forming a planetary transmission, the planetary transmission stage having a ring gear toothing (236), an arrangement of planet gears (234) which meshes with the ring gear toothing (236) and a planet carrier (235) which supports the arrangement of planet gears (234) and is rotatable relative to the ring gear toothing (236); and an output element (24) which is operatively connected to the transmission (21) for outputting a moving force for moving the vehicle door (11). The output element (24) is designed as a separate element relative to the planet carrier (235) and is connected to the planet carrier (235) for conjoint rotation in order to output the moving force.

Description

[0001] Door drive device for electrically adjusting a vehicle door

[0002] Description

[0003] The invention relates to a door drive device for electrically adjusting a vehicle door according to the preamble of claim 1.

[0004] Such a door drive device is used to adjust a vehicle door relative to a vehicle body, in particular to adjust a vehicle side door.

[0005] Such a door drive device comprises an electric motor, a gearbox driven by the electric motor, and an output element. The gearbox has a planetary gear stage forming a planetary gear set, which includes a ring gear, an arrangement of planet gears meshing with the ring gear, and a planet carrier rotatable relative to the ring gear and supporting the arrangement of planet gears. The output element is operatively connected to the gearbox to transmit an actuating force for adjusting the vehicle door.

[0006] A door drive device described in DE 10 2015 215 627 A1 has an adjusting element in the form of a safety strap, which is articulated to a vehicle body and can be adjusted via a drive device on the side of the vehicle door in order to move the vehicle door relative to the vehicle body. The drive device has a cable drum that can be rotated and is connected to the adjusting element in the form of the safety strap via a transmission element in the form of a pull cable, such that by rotating the cable drum the adjusting element can be moved towards the cable drum and thereby the vehicle door can be adjusted.

[0007] From DE 10 2017 230 151 A1, a door drive device with a switching device is known, which serves to establish an operative connection between two components and comprises at least one switching element that is adjustable in order to switch the switching device between different switching states. The drive device has a planetary gear driven via a worm gear.

[0008] From DE 102022 114432 A1 a door drive device with a planetary gear for driving an output element is known.

[0009] The object of the present invention is to provide a door drive device that enables a simple design, particularly with regard to the output element.

[0010] This problem is solved by a door drive device having the features of claim 1.

[0011] Accordingly, the output element is designed as a separate element relative to the planet carrier and is connected to the planet carrier in a rotating manner to transmit the adjusting force.

[0012] The door drive device has a gearbox driven by an electric motor, which includes a planetary gear stage forming a planetary gear set. The planetary gear stage has a ring gear and an arrangement of planet gears meshing with the ring gear. The planet gears are arranged on a planet carrier that is rotatable relative to the ring gear, so that when the planet carrier rotates, the planet gears roll on the ring gear and thus rotate on the planet carrier.

[0013] A drive element is connected to the planet carrier, designed to transmit an adjusting force to a higher-level assembly, thus causing the vehicle door to be adjusted relative to the vehicle body. For example, the door drive device can be fixed to the side of the vehicle door. The drive element is operatively connected to the vehicle body, so that a relative force can be generated between the vehicle door and the vehicle body via the door drive device, enabling the vehicle door to be adjusted electrically relative to the vehicle body.

[0014] The output element is designed as a separate component relative to the planet carrier and is rotatably connected to the planet carrier to transmit the adjusting force. Because the output element is not integrally formed with the planet carrier, but rather attached to the planet carrier as a separate component and rotatably arranged on it, a simplified design is achieved, offering opportunities for optimization in the manufacturing and operational characteristics of both the planet carrier and the output element.

[0015] Because the output element and the planet carrier are manufactured as separate parts, each part can be optimized with regard to its operating behavior and manufacturing process. After the (separate) manufacturing of the output element and the planet carrier, they are joined together so that, in an operational state of the door drive device, the output element and the planet carrier are rotationally connected.

[0016] While manufacturing the output element and the planet carrier from a single piece using, for example, a machining process, such as turning, typically results in a large volume of material removed and thus high material and manufacturing costs, separate manufacturing allows the output element and the planet carrier to be produced as compact components with reduced material usage, for example due to a reduced volume of material removed during a machining process.

[0017] Furthermore, the components can be optimized, for example, with regard to their strength, corrosion resistance and bearing properties.

[0018] Furthermore, for example, adapting the output element can provide a variable customer interface for using the door drive device. While the planetary carrier, for instance, can always be used unchanged as a standard component, the output element can be adapted to meet specific customer requirements, allowing a single planetary carrier design to be used with different output element designs without significantly increasing manufacturing costs.

[0019] In one embodiment, the output element is formed by a shaft extending along a longitudinal axis and rotatable about that axis. This shaft serves as the output for transmitting the adjusting force, thereby effecting a relative movement of the vehicle door relative to the vehicle body. The shaft is rotatable about its associated longitudinal axis. The planet carrier is rotationally connected to the output element and is thus also rotatable about the longitudinal axis associated with the output element.

[0020] In one embodiment, the door drive device has a housing part that carries the ring gear teeth. The housing part forms a ring gear, on the radially inward-facing side of which the ring gear teeth are formed, with which the planet gears arranged on the planet carrier, rotatable relative to the planet carrier, mesh.

[0021] The housing part is, for example, permanently attached to the door drive device and forms a housing for the planetary gear.

[0022] In one embodiment, the housing part has a first bearing section on which the planet carrier is rotatably mounted about the longitudinal axis. Preferably, no teeth are formed on the first bearing section. In particular, the ring gear teeth do not extend into the area of ​​the first bearing section. The first bearing section can, for example, be formed as an annular surface circumferentially on the inside of the housing part, on which the planet carrier is slidably mounted.

[0023] In one embodiment, the housing part, in addition to the first bearing section, has a second bearing section axially offset along the longitudinal axis relative to the first bearing section, on which the output element is rotatably mounted. For example, the second bearing section is supported relative to the output element by a bearing, such as a ball bearing.

[0024] Generally, the first and second bearing sections can form a plain bearing and slide against the planet carrier or the output element, respectively. However, it is also conceivable and possible that the first and / or second bearing sections are supported relative to the planet carrier or the output element by an additional bearing, for example, a ball bearing.

[0025] By providing a rotatable, bearing-mounted support for the planet carrier with the output element attached to it at axially offset locations relative to the housing part, the planet carrier with the output element is mounted centrally relative to the housing part and is supported against transverse forces.

[0026] In one embodiment, the planet carrier is axially supported relative to the housing part. For example, a running section in the form of an axially projecting arrangement of one or more ribs can be formed on the planet carrier, with which the planet carrier runs against a corresponding running surface of the housing part. Additionally or alternatively, a running section, for example in the form of a projecting rib, can be formed on the housing part. Due to the axial support of the planet carrier relative to the housing part, the planet carrier, with the output element attached to it, is axially positioned and supported in a defined position relative to the housing part.

[0027] In one embodiment, the planet carrier has a plurality of openings arranged along a circumferential axis around its longitudinal axis. Bearing axes for the planet gears of the planetary gear stage are mounted at these openings, allowing the planet gears to rotate on the planet carrier. When the planet carrier rotates relative to the ring gear teeth, the planet gears mesh with the ring gear teeth and roll along them, thus rotating the planet gears on the planet carrier. The planet gears are mounted eccentrically to the longitudinal axis around which the output element and the planet carrier rotate, by arranging the bearing axes, which are mounted at the openings of the planet carrier, along a circle around the longitudinal axis.

[0028] In one embodiment, the bearing axes support the output element axially relative to the planet carrier. For example, the bearing axes each have a step for this purpose. The output element rests against the steps of the bearing axes for axial support and is thus axially fixed relative to the planet carrier by the bearing axes.

[0029] The openings that accommodate the bearing shafts are, for example, shaped as through-holes in the planet carrier. The bearing shafts extend through these openings and are fixed relative to the planet carrier, for example, by each bearing shaft extending through its respective opening with a tapered shaft section and being plastically deformed at one end to secure the bearing shafts to the planet carrier. The bearing shafts overlap, for example, a radially projecting flange section of the output element such that the flange section occupies an axial position between the bearing shafts and the planet carrier, thus fixing the output element axially in a defined position relative to the planet carrier.

[0030] In one embodiment, the output element has a first positive-locking section and the planet carrier a second positive-locking section. The first and second positive-locking sections engage with each other to connect the output element to the planet carrier in a rotationally fixed manner. The first and second positive-locking sections are each formed, for example, by a toothed section extending around the longitudinal axis about which the output element is rotatable. The engagement of the first and second positive-locking sections creates a positive-locking connection between the output element and the planet carrier, such that the output element and the planet carrier are fixed to each other in a rotationally fixed manner (with respect to a rotational movement about the longitudinal axis of the output element).

[0031] The second positive-locking section, for example in the form of a toothed section, can be formed within the receiving opening of the planet carrier. When the output element engages in the receiving opening, the first positive-locking section of the output element, for example in the form of a toothed section, engages with the second positive-locking section, for example in the form of a toothed section within the receiving opening, thus creating a rotationally fixed connection between the output element and the planet carrier.

[0032] Instead of a positive-locking, rotationally fixed connection via positive-locking sections, the output element can also be torque-resistant relative to the planet carrier by clamping it relative to the planet carrier, for example, axially clamped, such as by an axially acting clamping screw or by axial support via the bearing shafts on which the planet gears are mounted. In one embodiment, the output element has a flanged section projecting radially outwards relative to the first positive-locking section, which axially supports the output element against the planet carrier. The flanged section is formed, for example, at an end face of the output element formed by a shaft.The flange section is preferably flush with a surface of the planet carrier in the operational position and provides support in the axial direction (with reference to the longitudinal axis of the output element) between the output element and the planet carrier.

[0033] In one embodiment, the planetary gear stage has an axle element that meshes with the arrangement of planet gears. The axle element forms a sun gear with respect to the planet gears of the planet carrier and is, for example, arranged concentrically to the longitudinal axis of the output element. The output element meshes with the planet gears mounted on the planet carrier, so that the planet gears can be driven via the axle element, thereby rolling on the ring gear teeth, rotating on the planet carrier, and thus setting the planet carrier and the output element into a rotary motion.

[0034] In one embodiment, the output element has a pin opening for receiving a centering pin to center the axle element relative to the planet carrier. The output element is thus centered relative to the axle element, which, however, is rotatable relative to the output element. By means of a centering pin arranged in the pin opening and also supported in a centering manner on the axle element, the axle element is centered relative to the output element, so that the output element and the axle element are rotatable about a common longitudinal axis, while relative movement between the output element and the axle element about the longitudinal axis is possible.

[0035] In one embodiment, the planetary gear stage comprises an arrangement of further planet gears rotatably mounted on a further planet carrier, meshing with the ring gear teeth. The axle element is preferably rotationally connected to the further planet carrier, whereby the axle element can be formed integrally with the further planet carrier, or the axle element and the further planet carrier, analogous to the output element and the (first) planet carrier, can be manufactured as separate components. The planetary gear of the planetary gear stage is accordingly designed as a two-stage planetary gear. For this purpose, the planetary gear stage has two planet carriers, on each of which an arrangement of associated planet gears is rotatably mounted, meshing with the ring gear teeth.The axle element is connected to one, drive-side planet carrier and is in meshing with the planet gears of the other, output-side planet carrier, so that by driving one, drive-side planet carrier the axle element is rotated, thereby moving the planet gears on the other, output-side planet carrier and setting the planet carrier, together with the output element connected to this planet carrier, into a rotary motion.

[0036] The planetary gear can, in particular, reduce the speed, so that the speed of the electric motor towards the output element is reduced, but the torque is translated and thus increased.

[0037] In one embodiment, the output element has a toothed output for transmitting the adjusting force. The toothed output is formed at an end of the output element, which is preferably formed by a shaft and is located away from the planet carrier, and provides an interface for connecting it to a higher-level, output-side assembly.

[0038] In one embodiment, the output element is made of a first material and the planet carrier of a second material that differs from the first. Because the output element and the planet carrier are manufactured as separate components, they can readily be made of different materials. This allows the component properties of both the output element and the planet carrier to be optimized.

[0039] For example, the output element of the door drive device, when installed as intended, may be located in a wet environment within a vehicle, while the planetary carrier is located in a dry environment, such as within the housing of the door drive device's gearbox. The output element may be optimized for corrosion resistance and thus adapted for use in wet environments. In contrast, the planetary carrier may be manufactured to be cost-effective and load-bearing, with good bearing properties, for use in dry environments. In one embodiment, the gearbox includes an input gear stage operatively connected to the planetary gear stage. This input gear stage is located upstream of the planetary gear stage.

[0040] The door drive mechanism thus uses a two-stage gearbox. The input gear stage is located on the input side of the electric motor and is driven by the electric motor during operation. The downstream planetary gear stage is operatively connected to the input gear stage and to the output element, through which an adjusting force can be transmitted and introduced into a power flow for adjusting the vehicle door.

[0041] In one embodiment, the input gear stage comprises a drive wheel and a drive worm gear, driven by the electric motor, which meshes with the drive wheel. The drive worm gear, which forms a worm tooth, is mounted on a motor shaft of the electric motor and is rotated by the electric motor during operation. The rotational movement of the drive worm gear is converted into a rotational movement of the drive wheel. The drive wheel is operatively connected to the downstream planetary gear stage, which is implemented by the planetary gear set, and thus drives the planetary gear stage implemented by the planetary gear set.

[0042] The door drive device is used to operate a vehicle door, particularly a side door. The door drive device can be connected via its output element to, for example, a door hinge and act on a pivot axis of the door hinge to adjust the vehicle door. A kinematic transmission for transmitting an adjustment force to the vehicle door is also conceivable and possible, for example, a lever mechanism similar to a four-bar linkage or the like.

[0043] The underlying concept of the invention will be explained in more detail below with reference to the exemplary embodiments shown in the figures. These show:

[0044] Fig. 1 shows a schematic view of a vehicle door on a vehicle with a door drive device attached to it;

[0045] Fig. 2 shows a view of an embodiment of a door drive device;

[0046] Fig. 3 shows a view of a gearbox of a door drive device; Fig. 4 shows another view of the gearbox;

[0047] Fig. 5 shows yet another view of the gearbox;

[0048] Fig. 6 shows yet another view of the gearbox;

[0049] Fig. 7 shows a view of the gearbox, without a housing part.

[0050] planetary gear stage formed ring gear;

[0051] Fig. 8 shows a view of an assembly of the gearbox, comprising a

[0052] Planet carrier with planet gears arranged on it and an output element of the planetary gear stage;

[0053] Fig. 9 shows a separate view of the planet carrier with the output element attached to it;

[0054] Fig. 10 shows the arrangement according to Fig. 9 in an exploded view;

[0055] Fig. 11 shows a side view of the arrangement according to Fig. 10;

[0056] Fig. 12 shows a longitudinal section view through the arrangement according to Fig. 9;

[0057] Fig. 13 shows a view of the bearing axes on the planet carrier;

[0058] Fig. 14 shows a cross-sectional view of a bearing axis on the planet carrier; and

[0059] Fig. 15 shows a view of a housing part forming a ring gear with the planet carrier and the output element.

[0060] Fig. 1 shows a schematic view of a vehicle 1, which has a side door 11 that can be pivoted relative to a vehicle body 10. The vehicle door 11 is coupled to the vehicle body 10 via door hinges 110 and can be pivoted around the door hinges 110 relative to the vehicle body 10. A door drive device 2 serves to adjust the vehicle door 11 relative to the vehicle body 10 by means of an electric motor and comprises an electric motor 20 and a gearbox 21 for introducing an adjustment force into the vehicle door 11. The door drive device 2 can, for example, act on one of the door hinges 110 and introduce a torque into a pivot axis of the door hinge 110 in order to adjust the vehicle door 11 between a closed and an open position by means of an electric motor.

[0061] In an embodiment of a door drive device 2 shown in Fig. 2, an electric motor 20 is coupled to a gearbox 21, which has an input gear stage 22 and a planetary gear stage 23. An output element 24 is driven via the gearbox 21, which is operatively connected, for example, to a pivot axis of a door hinge 110 of a vehicle door 11, or drives a kinematic transmission, for example a four-bar linkage or the like, in order to move the vehicle door 11 relative to the vehicle body 10.

[0062] The door drive device 2 can, for example, be permanently mounted on the vehicle door 11 and, in this case, is adjusted together with the vehicle door 11. For this purpose, the door drive device 2 can, for example, be located inside the door cavity of the vehicle door 11, for instance, in a wet area of ​​the vehicle door 11.

[0063] In the illustrated embodiment, the input gear stage 22 of the gearbox 21 has a housing part 220 to which the electric motor 20 and a control unit 27 are rigidly connected. As can be seen from the different views of the gearbox 21 according to Figures 3 to 7, a drive wheel 222, arranged on an axle element 223, is received in an opening 225 of the housing part 220. This drive wheel meshes with a drive worm 221 arranged on a motor shaft 200 of the electric motor 20, such that the drive wheel 222 can be set into a rotary motion within the housing part 220 by the drive worm 221.

[0064] The motor shaft 200 with the drive worm 221 arranged on it is rotatable about a first longitudinal axis L1 relative to the housing part 220. The drive wheel 222 is rotationally connected to the axle element 223 and is rotatable about a second longitudinal axis L2 perpendicular to the first longitudinal axis L1 relative to the housing part 220. The axes of rotation L1, L2 of the drive worm 221 on the one hand and of the drive wheel 222 on the other are thus perpendicular to each other. The planetary gear stage 23 is formed by a planetary gear and has a housing part 230 which has a cylindrical basic shape and forms a ring gear toothing 236 in an inner cavity, as can be seen, for example, in Fig. 5. The planetary gear has two planet gear stages with two groups of planet gears 232, 234, each rotatably mounted on an associated planet carrier 231, 235 and meshing with the ring gear teeth 236.

[0065] The first planet gears 232 on a first planet carrier 231 are in tooth engagement with a toothing 224 at one end of the axle element 223, so that the axle element 223 drives the planet gears 232 and sets them in a rotary motion during operation, which causes the planet gears 232 to rotate on the ring gear toothing 236 and thereby rotate the planet carrier 231 within the housing part 230.

[0066] The planet carrier 231 of the first planetary gear stage is rotationally connected to an axle element 233, which has teeth that mesh with the planet gears 234 on the planet carrier 235 of the second planetary gear stage. When the first planet carrier 231 is thus set into rotation by the input gear stage 22, this rotation is transmitted via the axle element 233 to the planet gears 234 of the second planetary gear stage, causing the planet gears 234 to rotate on the ring gear teeth 236 and thereby rotate the planet carrier 235 within the housing part 230.

[0067] The planet carrier 235 is connected to the output element 24 in a rotational manner, so that a rotational movement of the planet carrier 235 leads to a twisting of the output element 24.

[0068] In the gearbox 21, the housing parts 220 and 230 are fixed to one another in a torque-resistant manner, so that the ring gear 236 of the housing part 230 is held in position relative to the housing part 220 during operation, and thus stationary relative to the electric motor. To connect the housing parts 220 and 230, an intermediate element 25 is provided, which is arranged between the housing parts 220 and 230 and centers the housing parts 220 and 230 relative to each other and also fixes them to one another in a torque-resistant manner.

[0069] Inside, the intermediate element 25 forms a bearing seat in which a bearing 26 is received. The bearing 26 serves to support the axle element 223 of the input gear stage 22. Because the bearing 26 is arranged on the intermediate element 25 and thus centered by the intermediate element 25, and because the housing parts 220 and 230 are also aligned and thus centered relative to each other via the intermediate element 25, it is ensured that the axle element 223, and thus the drive gear 222, is radially supported within the housing part 220 in the intended, centered manner. Furthermore, the ring gear 236, and thus the planetary gear set of the planetary gear stage 23, is centered relative to the axle element 223, resulting in low-friction and quiet operation.

[0070] The bearing 26 is fixed via a fixing element 260, which engages, for example, with detent sections in the intermediate element 25 and thus axially secures the bearing 26 in the bearing seat of the intermediate element 25.

[0071] The housing parts 220 and 230 are torque-resistant to each other in their assembled position via the intermediate element 25. The intermediate element 25 provides a simple and cost-effective connection between the housing parts 220 and 230. The intermediate element 25 serves as both a centering element and a torque-resistant connection. Furthermore, the intermediate element 25 also supports gear components, particularly the input gear stage 22.

[0072] In the illustrated embodiment, the (output-side) planet carrier 235 of the planetary gear stage 23 is rotationally connected to the output element 24 and provides the output for the planetary gear stage 23 and thus the gearbox 21.

[0073] Referring now to Figs. 8 to 15, in the illustrated embodiment the planet carrier 235 and the output element 24 are manufactured as separate components and, in the operational state of the door drive device 1, are connected to each other by rotating the output element 24 in an associated receiving opening 238 of the planet carrier 235.

[0074] In the illustrated embodiment, the output element 24 is configured as a shaft element extending along the longitudinal axis L2 and rotatable about the longitudinal axis L2 together with the planet carrier 235 during operation. The output element 24 forms an output toothing 240, via which the output element 24 is operatively connected to a higher-level assembly for transmitting an adjusting force.

[0075] At one end opposite the output toothing 240, the output element 24 forms a positive-locking section 242 in the form of a tooth. With this positive-locking section 242, the output element 24, in its assembled position, is arranged within the receiving opening 238 of the planet carrier 235 and engages with an associated positive-locking section 239 within the receiving opening 238 of the planet carrier 235 in a positive-locking manner, so that the output element 24 and the planet carrier 235 are rotationally fixed relative to each other.

[0076] At the end associated with the positive-locking section 242, the output element 24 is bounded by a radially outwardly projecting collar section 241. In the assembled position, the collar section 241 is received in the receiving opening 238 such that the collar section 241 is flush with a surface of the planet carrier 235, as can be seen particularly in the sectional view according to Fig. 12.

[0077] The output element 24 is arranged concentrically to the planet carrier 235 and concentrically to the longitudinal axis L2 by engaging the receiving opening 238. At the end associated with the positive-locking section 242, a pin opening 243 is formed on the output element 244, into which a centering pin 244 engages, as can be seen in Fig. 8. The centering pin 244 is in centering engagement with the axle element 233 of the input-side planet gear stage of the planet carrier 231, so that the axle element 233, which is in tooth engagement with the planet gears 234 of the output-side planet gear stage of the planet carrier 235, is centered relative to the planet carrier 235, but is rotatable relative to the planet carrier 235 and thus relative to the output element 24.

[0078] On the planet carrier 235, openings 237 are formed and arranged around the longitudinal axis L2 along a circular line. Bearing shafts 234A are received in these openings (as can be seen in Figures 13 and 14), and the planet gears 234 are rotatably mounted on these bearing shafts. In the assembled position, the bearing shafts 234A support the output element 24 axially relative to the planet carrier 235, thus preventing axial relative movement between the output element 24 and the planet carrier 235. As can be seen in Figures 13 and 14, the bearing shafts 234A are arranged around the longitudinal axis L2 along a circular line. Each bearing shaft 234A extends with a tapered shaft section 234C through an associated opening 237 formed as a through-hole in the planet carrier 235.An end 234D, which is turned away from the section of the bearing axis 234A supporting the associated planet gear 234, is plastically deformed and thereby determines the respective bearing axis 234A relative to the planet carrier 235, as can be seen in Fig. 14.

[0079] In the area of ​​the transition between the tapered section 234C and the bearing section of the bearing axis 234A that supports the respective planet gear 234, a step 234B is formed, with which the respective bearing axis 234A engages the radially projecting flanged section 241 of the output element 24. The flanged section 241 thereby occupies an intermediate position, axially along the longitudinal axis L2, between the bearing axes 234A and the planet carrier 235, so that the output element 24 is secured in an axial position relative to the planet carrier 235.

[0080] Because the output element 24 and the planet carrier 235 are made from different components, the components of the output element 24 and the planet carrier 235 can be optimized with regard to their properties.

[0081] The output element 24 and the planet carrier 235 can be made of different materials. This allows, for example, the output element 24 to be adapted for use in wet environments, while the planet carrier 235 can be optimized for dry environments in terms of its load-bearing capacity and bearing properties.

[0082] Both the output element 24 and the planet carrier 235 can be manufactured as compact components, with comparatively low material costs, in particular a comparatively low chip volume in a machining manufacturing process.

[0083] Because the output element 24 and the planet carrier 235 are manufactured as separate components, the output element 24 can also be adapted to customer requirements, particularly with regard to coupling with a downstream assembly. While the planet carrier 235, for example, can always be used in its original form as a standard part, the output element 24 can be adapted to specific applications, such as coupling with a downstream assembly, depending on customer requirements. This results in improved, simplified variability in the customer interface of the door drive device 1.

[0084] The arrangement of the planet carrier 235 and the output element 24 is mounted relative to the housing part 230 forming the ring gear toothing 236, as can be seen from Fig. 15.

[0085] The housing part 30 forms a first bearing section 236A, which forms a sliding surface extending annularly around the longitudinal axis L2, against which an outer circumferential surface 235B of the planet carrier 235 rests, as can be seen in Fig. 15. In addition, the housing part 230 forms a second bearing section 236C, which supports the output element 24 via a bearing in the form of a ball bearing 236B.

[0086] The arrangement of the planet carrier 235 and the output element 24 is thus supported via the position sections 236A, 236C of the housing part 230 at locations offset from each other axially along the longitudinal axis L2, so that the planet carrier 235 and the associated output element 24 are centered on the longitudinal axis L2 and are also supported against transverse forces.

[0087] In the illustrated embodiment, a starting section 235A is formed on the planet carrier 235 in the form of an arrangement of axially projecting ribs. The starting section 235A is formed on a side of the planet carrier 235 facing an end face of the housing part 230. During operation, the planet carrier 235 runs over the starting section 235A on the housing part 230 and is supported axially relative to the housing part 230 along the longitudinal axis L2.

[0088] The underlying idea of ​​the invention is not limited to the embodiments described above.

[0089] A door drive device of the type described can be used to adjust a side door on a vehicle, but also, for example, to adjust a tailgate in a vehicle.

[0090] The door drive device serves to introduce an adjusting force for adjusting the vehicle door, whereby the door drive device can act directly on a door hinge or a kinematic transmission can be arranged on the output side of the door drive device, for example in the form of a four-bar linkage or another lever transmission.

[0091] List of reference symbols

[0092] 1 vehicle

[0093] 10 Vehicle body

[0094] 11 Vehicle door

[0095] 110 Door hinge

[0096] 2 Door drive device

[0097] 20 engine

[0098] 200 motor shaft

[0099] 21 gearboxes

[0100] 22 Input gear stage

[0101] 220 Housing part

[0102] 221 Drive element (drive screw)

[0103] 222 Drive wheel

[0104] 223 Axle element

[0105] 224 gear teeth

[0106] 225 opening

[0107] 23 planetary gear stage

[0108] 230 Housing part

[0109] 231 Planetary Carriers

[0110] 232 planetary gears

[0111] 233 Axle element

[0112] 234 planetary gears

[0113] 234A Bearing axle

[0114] 234B Stage

[0115] 234C shaft section

[0116] 234D End

[0117] 235 planetary carriers

[0118] 235A Starting section

[0119] 235B External perimeter

[0120] 236 Ring gear teeth

[0121] 236A Storage section

[0122] 236B Bearing

[0123] 236C Storage section

[0124] 237 Opening

[0125] 238 Intake opening

[0126] 239 Positive locking section 24 Drive element

[0127] 240 Output teeth

[0128] 241 Federal Government

[0129] 242 Form-locking section 243 Pin opening

[0130] 244 Centering pin

[0131] 25 Intermediate element

[0132] 26 warehouses

[0133] 27 Control unit L1, L2 Longitudinal axis

Claims

Claims 1. Door drive device (2) for electrically adjusting a vehicle door (1 1 ), comprising an electric motor (20), a transmission (21) driven by the electric motor (20), which has a planetary gear stage (23) forming a planetary gear, which has a ring gear toothing (236), an arrangement of planet gears (234) meshing with the ring gear toothing (236) and a planet carrier (235) rotatable relative to the ring gear toothing (236) supporting the arrangement of planet gears (234), and an output element (24) operatively connected to the transmission (21 ) for transmitting an adjusting force for adjusting the vehicle door (11 ), characterized in that the output element (24) is designed as a separate element relative to the planet carrier (235) and is rotatably connected to the planet carrier (235) for transmitting the adjusting force.

2. Door drive device (2) according to claim 1 , characterized in that the output element (24) is formed by a shaft extending along a longitudinal axis (L2) and rotatable about the longitudinal axis (L2).

3. Door drive device (2) according to claim 2, characterized by a housing part (230) carrying the ring gear teeth (236).

4. Door drive device (2) according to claim 3, characterized in that the housing part (230) has a first bearing section (236A) on which the planet carrier (235) is rotatably mounted about the longitudinal axis (L2).

5. Door drive device (2) according to claim 4, characterized in that the housing part (230) has a second bearing section (236C) axially offset along the longitudinal axis (L2) relative to the first bearing section (236A), on which the output element (24) is rotatably mounted.

6. Door drive device (2) according to one of claims 3 to 5, characterized in that the planet carrier (235) is axially supported relative to the housing part (230).

7. Door drive device (2) according to claim 6, characterized in that the planet carrier (235) and / or the housing part (230) have a starting section (235A) on which there is an axial contact between the planet carrier (235) and the housing part (230).

8. Door drive device (2) according to one of claims 2 to 7, characterized in that the planet carrier (235) has a plurality of opening openings (237) arranged along a circumferential direction around the longitudinal axis (L2) and in which bearing axes (234A) for bearing the planet gears (234) are received.

9. Door drive device (2) according to claim 8, characterized in that the bearing axes (234A) support the output element (24) axially relative to the planet carrier (235).

10. Door drive device (2) according to claim 9, characterized in that the bearing axes (234A) each have a step (234B), wherein the output element (24) rests against the steps (234B) of the bearing axes (234A) for axial support.

11. Door drive device (2) according to one of the preceding claims, characterized in that the output element (24) engages in a receiving opening (238) of the planet carrier (235).

12. Door drive device (2) according to one of the preceding claims, characterized in that the output element (24) has a first positive locking section (242) and the planet carrier (235) has a second positive locking section (239), wherein the first positive locking section (242) and the second positive locking section (239) are in rotationally fixed engagement with each other to connect the output element (24) to the planet carrier (235).

13. Door drive device (2) according to claim 12, characterized in that the first positive locking section (242) and the second positive locking section (239) are each formed by a toothing.

14. Door drive device (2) according to one of the preceding claims, characterized in that the output element (24) has a flange section (241) projecting radially outwards relative to the first positive locking section (242), which axially supports the output element (24) on the planet carrier (235).

15. Door drive device (2) according to one of the preceding claims, characterized in that the planetary gear stage (23) has an axle element (233) which meshes with the arrangement of planet gears (234).

16. Door drive device (2) according to claim 15, characterized in that the output element (24) has a pin opening (243) for receiving a centering pin (244) for centering the axle element (233) relative to the planet carrier (235).

17. Door drive device (2) according to claim 15 or 16, characterized in that the planetary gear stage (23) has an arrangement of further planet gears (232) rotatably arranged on a further planet carrier (231) and meshing with the ring gear teeth (236).

18. Door drive device (2) according to claim 17, characterized in that the axle element (233) is rotatably connected to the further planet carrier (231).

19. Door drive device (2) according to one of the preceding claims, characterized in that the output element (24) has an output toothing (240) for transmitting the adjusting force.

20. Door drive device (2) according to one of the preceding claims, characterized in that the output element (24) is made of a first material and the planet carrier (235) is made of a second material different from the first material.

21. Door drive device (2) according to one of the preceding claims, characterized in that the transmission (21 ) has an input transmission stage (22) operatively connected to the planetary gear stage (23).

22. Door drive device (2) according to claim 21 , characterized in that the input gear stage (22) has a drive wheel (222) and a drive worm (221) which can be driven by the electric motor (20) and which meshes with the drive wheel (222).

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