Drive device for an adjustable element of a vehicle

Abstract

Drive device (1) for an adjustable element of a vehicle, in particular for a sunroof, comprising - a housing (2), - an output shaft (5) mounted in the housing (2), - a pinion (6) on an output-side end (10) of the output shaft (5) for driving the adjustable element, - a worm gear stage with a worm wheel (7) on the output shaft (5) and a worm shaft (8), and - an electric motor for driving the worm shaft (8), wherein - a first axial emergency tool engagement (12) for rotating the output shaft (5) is formed at the output-side end (10) in the output shaft (5), and - the output shaft (5) is made of a different material than the worm gear (7), wherein at an end (11) of the output shaft (5) opposite the output-side end (10) in the output shaft (5) a second axial emergency tool engagement (13) for rotating the output shaft (5) is formed, wherein the housing (2) comprises a stub (15), wherein the output shaft (5) is inserted on the stub (15) and is rotatably mounted on the stub (15), with a housing cover (3) with an extension (14) inserted into the stub (15), wherein the extension (14) is open on both sides for the passage of an emergency tool, wherein the housing cover (3) is designed as a cover of an electronics unit which is separated from the gearbox by means of a gearbox housing wall.

Description

Prior ArtThe present invention relates to a drive device for an adjustable element of a vehicle, in particular for a sliding roof, and to a drive arrangement comprising the drive device and an emergency adjustment tool.The adjustment of sliding roofs in motor vehicles is nowadays effected by means of a drive device according to the species of claim 1.The electrical energy of a motor is transmitted via the gear comprising worm shaft and worm wheel to the pinion and thus to the sliding roof. In order to ensure a closing movement of the sliding roof even in the event of failure of the electrical power supply, a coaxial engagement for a crank (emergency tool) is integrated in previously known drives at the end of the output shaft facing away from the pinion.DE 10 2009 046 517 A1, DE 10 2011 121 460 A1, EP 2 218 944 A1 and JP 2008 025 643 A all show drive devices in which a worm wheel is driven by an electric motor. On the worm wheel, a driven pinion is arranged, on the axial end face of which an emergency engagement opening for an emergency tool is formed.Disclosure of the InventionThe drive device according to the invention having the features of claim 1 enables a very flexible installation position of the drive device in a vehicle. According to the invention, an axial emergency tool engagement is provided at least at the output-side end of the output shaft. The output device according to the invention can thus be installed with the output-side end pointing toward the vehicle interior. This advantage is achieved by a drive device for an adjustable element of a vehicle. In particular, the drive device is used for actuating a sliding roof. The drive device comprises a housing, an output shaft supported in the housing, and a pinion on an output-side end of the output shaft. The adjustable element is driven by the pinion. Furthermore, a worm gear stage is provided. This is composed of a worm wheel, which is mounted on the output shaft in a rotationally fixed manner, and a worm shaft. The worm shaft is driven by means of an electric motor. Thus, the torque runs from the electric motor via the worm shaft to the worm wheel. The worm wheel rotates with the output shaft and thus with the pinion. According to the invention, a first axial emergency tool engagement is formed at the output-side end of the output shaft. The output-side end of the output shaft is the end with the pinion. By means of the emergency tool engagement and a corresponding emergency tool, the output shaft can be actuated, for example in the event of failure of the electric motor. Advantageously, the output shaft is formed from a different-in particular harder-material than the worm wheel.According to the invention, it is provided that an axial emergency tool engagement is provided at each of the two axial ends of the output shaft. As a result, the installation position of the drive device in the vehicle can be selected to be even more flexible.According to the invention, the housing is supplemented by a housing cover (also: electronic cover). This housing cover is located at the opposite end of the output shaft. The housing cover has an extension. This extension preferably extends coaxially to the output shaft. The stump described above is again plugged onto the extension of the housing cover. The extension is hollow on the inside, so that the emergency tool can be inserted through the extension and through the stump as far as the second emergency tool engagement.The dependent claims show preferred developments of the invention.For a cost-effective and efficient production of the drive device, it is preferably provided that both emergency tool engagements are formed by a common through hole in the output shaft. A driver profile is formed in this through hole, so that a form-fit connection to the corresponding emergency tool is possible. In particular, the driver profile is designed as an internal polygon.In a preferred embodiment, the output shaft is cup-shaped. The pot shape is seated on a stump of the housing. This stump of the housing thus serves for receiving and mounting the output shaft. The stump is open on both sides, so that the emergency tool can also be inserted from the end of the output shaft opposite the output-side end.In a preferred embodiment, the pinion is manufactured integrally with the output shaft. The pinion is thus an integral component made of the same material as the output shaft. For example, the output shaft with the pinion is made of metal-in particular of sintered metal component. Advantageously, the worm wheel is injection-molded onto the output shaft-in particular by means of plastic injection molding.The invention furthermore comprises a drive arrangement comprising one of the drive devices just described and an emergency tool. The emergency tool is designed for positive connection to the output shaft via one of the two emergency tool engagements. In particular, for this purpose the emergency tool has an external polygonal shape. The subclaims and advantageous embodiments described within the scope of the drive device according to the invention are correspondingly advantageously applied to the drive arrangement according to the invention.BRIEF DESCRIPTION OF THE DRAWINGAn embodiment of the invention will be described in detail below with reference to the accompanying drawings. The drawing shows: FIG. 1 shows a drive device according to the invention according to an exemplary embodiment.Embodiment of the InventionFIG. 1 shows a drive device 1 in section; the drive device 1 comprises a housing 2; the housing 2 is closed by a housing cover 3 (electronics cover) and a further housing cover 4 (transmission cover). In the housing 2, an output shaft 5 is rotatably mounted. The output shaft 5 extends along an axis 9. In the example shown, the pinion 6 is an integral part of the output shaft 5.An electric motor is not shown, which is located in the housing 2 or is flange-connected to the housing 2. The armature shaft of the electric motor is connected coaxially to a worm shaft 8, the worm shaft 8 being in engagement with a worm wheel 7, the worm wheel 7 being mounted (injection molded) on the output shaft 5 in a rotationally fixed manner.Along the output shaft 5 and the axis 9, respectively, an output-side end 10 and an opposite end 11 are defined. The side with the pinion 6 is the output-side end 10, since here the torque is transmitted to further elements to be adjusted, e.g. two riser spirals for driving a sliding roof.A through hole is formed in the output shaft 5 coaxially with the axis 9. The through-hole has an internal polygon as a driver profile. A side of the through hole facing the output-side end 10 is defined as the first emergency tool engagement 12. The side of the through hole facing the opposite end 11 is defined as a second emergency tool engagement 13.An emergency tool can be inserted into the emergency tool engagements 12, 13, for example with an external polygonal element. The emergency tool is inserted into the first emergency tool engagement 12 from the output-side end 10 coaxially with the axis 9. The emergency tool is inserted into the second emergency tool engagement 13 from the opposite end 11 coaxially to the axis 9.A stump 15 is formed in the housing 2. The stump 15 extends coaxially to the axis 9. the output shaft 5 is inserted on the stump 15 and is rotatably mounted on the stump 15. The stump 15 is open on both sides. An extension 14 is formed in the housing cover 3. The extension 14 likewise extends coaxially with respect to the axis 9. the extension 14 is inserted into the stump 15. Since both the stump 15 and the extension 14 are open on both sides, the emergency tool can be inserted along the axis 9 from the opposite end 11 into the second emergency tool engagement 13. In particular, the inner surface of the extension 14 is used as a bushing 17 for the radial guidance of the emergency tool.The drive device 1 shown is used in particular for driving a sliding roof in a vehicle. Because the emergency tool can be inserted from both axial sides of the output shaft 5, the vehicle manufacturer can install the illustrated drive device 1 in two different installation positions.

Claims

Drive device (1) for an adjustable element of a vehicle, in particular for a sliding roof, comprising - a housing (2), - an output shaft (5) mounted in the housing (2), - a pinion (6) on an output-side end (10) of the output shaft (5) for driving the adjustable element, - a worm gear stage having a worm wheel (7) on the output shaft (5) and a worm shaft (8), and - an electric motor for driving the worm shaft (8), wherein - a first axial emergency tool engagement (12) for rotating the output shaft (5) is formed in the output shaft (5) at the output-side end (10), and - the output shaft (5) is formed from a different material than the worm wheel (7), wherein a second axial emergency tool engagement (13) for rotating the output shaft (5) is formed in the output shaft (5) at an end (11) of the output shaft (5) opposite the output-side end (10), wherein the housing (2) comprises a stump (15), wherein the output shaft (5) is plugged onto the stump (15) and is rotatably mounted on the stump (15), having a housing cover (3) with an extension (14) inserted into the stump (15), wherein the extension (14) is open on both sides for passing an emergency tool, wherein the housing cover (3) is formed as a cover of an electronics unit which is separated from the transmission by means of a transmission housing wall.Drive device according to claim 1, characterised in that the extension (14) is hollow on the inside, so that the emergency tool can be inserted through the extension (14) and through the stump (15) as far as the second emergency tool engagement (13). (3, 6-9)Drive device according to Claim 1, characterized in that the first and second emergency tool engagements (12, 13) are formed by an axial through hole with a driver profile in the output shaft (5), wherein the driver profile is in particular designed as an internal polygon.Drive device according to one of the preceding claims, characterized in that an inner surface of the extension (14) is designed as a passage (17) for the radial guidance of the emergency tool. (5,5-7)Drive device according to claim 4, characterised in that the stump (15) for guiding through the emergency tool is open on both sides.Drive device according to one of the preceding claims, characterized in thatthe torque can be transmitted on the pinion (6) to further elements to be adjusted, for example two riser spirals for driving a sliding roof. (4,15)Drive device according to one of the preceding claims, characterized in that the pinion (6) is manufactured in one piece - from the same material as a single integral component - with the output shaft (5).Drive device according to one of the preceding claims, characterized in that the output shaft (5) with the pinion (6) is formed from metal - in particular as a sintered component.Drive device according to one of the preceding claims, characterized in that the worm wheel (7) is injection-moulded onto the output shaft (5), in particular by means of plastic injection-moulding.Drive arrangement, comprising a drive device (1) according to one of the preceding claims, and an emergency tool, wherein the emergency tool is designed for positive connection to the output shaft (5) via the first and / or second emergency tool engagement (12, 13).

Images