DE102020202459A1 - Drive system for a functional device of a motor vehicle - Google Patents

Abstract

Such a drive system comprising at least one drive element which is mounted rotatably about an axis of rotation in a drive housing and - in a ready-to-use assembled state - is operatively connected to a drive motor in a torque-transmitting manner, at least one elongated drive transmission line which extends into the drive housing through a passage channel of the drive housing and on which The drive element engages, the drive transmission train being translationally displaceable by means of a rotation of the drive element about the axis of rotation for the transmission of drive forces to an output element assigned to the functional device, and having at least one cable casing which is inserted into the passage channel at one end and envelops the drive transmission train at least in the area of the passage passage , is known. According to the invention, at least one sealing element assigned to the strand casing is provided, which on its inner circumference is fluid-tight with the strand casing and cooperates on its outer circumference in a fluid-tight manner with a duct wall of the passage duct, whereby the drive housing is sealed in a fluid-tight manner by means of the sealing element against the ingress of moisture through the passage duct. Use in a passenger vehicle.

Description

The invention relates to a drive system for a functional device of a motor vehicle, having at least one drive element which is rotatably mounted about an axis of rotation in a drive housing and - in a ready-to-use assembled state - is operatively connected to a drive motor in a torque-transmitting manner, at least one elongated drive transmission train which passes through a passage channel of the Drive housing extends into the same and engages the drive element, the drive transmission train being translationally displaceable by means of a rotation of the drive element about the axis of rotation for the transmission of drive forces to an output element assigned to the functional device, and having at least one cable casing which is inserted into the passage channel at one end and envelops the drive transmission train at least in the area of the passage channel.

Such a drive system is from DE 101 23 420 A1 known and provided for an adjustable closing element of a vehicle roof. The known drive system is designed as a cable drive system and accordingly has a drive element in the form of a cable drum which is rotatably mounted about an axis of rotation in a drive housing referred to as a cable drum housing. Furthermore, the known drive system has an elongated drive transmission train in the form of a pull cable harness, which extends through a passage channel of the cable drum housing into the same and engages the cable drum. The pulling cable loom also engages the closing element of the vehicle roof and is translationally displaceable by means of a rotation of the cable drum in order to transmit drive forces to the closing element. The known drive system also has a strand casing called a cuff. The sleeve is inserted into the passage channel of the cable drum housing at one end and encloses the pull cable loom at least in the area of the passage channel.

The object of the invention is to provide a drive system of the type mentioned at the beginning which has improved properties compared to the prior art.

This object is achieved in that at least one sealing element is provided which is assigned to the strand casing and which interacts in a fluid-tight manner on its inner circumference with the strand casing and in a fluid-tight manner on its outer circumference with a duct wall of the passage, whereby the drive housing by means of the sealing element against the ingress of moisture through the passage duct is sealed fluid-tight. The solution according to the invention can prevent moisture from penetrating into the drive housing and the associated impairment of the drive system. For this purpose, the sealing element assigned to the strand casing is provided according to the invention. The inner circumference of the sealing element interacts in a fluid-tight manner with the strand casing and the outer circumference of the sealing element interacts in a fluid-tight manner with the channel wall of the passage channel. As a result, a gap extending between the strand casing and the duct wall is sealed in a fluid-tight manner by means of the sealing element. The drive housing and / or the said gap is preferably sealed in a fluid-tight manner by means of the sealing element in the sense of water-tight in accordance with a protection class of IP66, IP67 or IP68. The drive transmission train is preferably designed to be tensile and flexible and is provided for the transmission of tensile forces to the output element of the functional device. The strand casing is preferably flexible and pressure-resistant. The strand casing serves to support and guide the drive transmission train in a slidable manner. One end of the strand casing extends axially into the passage channel of the drive housing. The passage channel extends between an outside and an inside of the drive housing. The drive transmission train engages frictionally and / or positively on the drive element. The drive transmission train can in particular be designed as a rope, cable pull, Bowden cable or chain hoist. Accordingly, the drive element can be designed in particular as a cable drum, cable drum, Bowden cable drum, chain wheel or pinion. The at least one sealing element is preferably made from a flexible material, preferably from an elastomeric plastic material. The sealing element is preferably arranged coaxially to the strand casing and / or the passage channel. The drive system is provided for a functional device of a motor vehicle, which can be designed in particular in the form of a tank flap device, an openable vehicle roof, a cargo space cover, a cargo space partition network, a shading device or the like.

In an embodiment of the invention, the sealing element is formed in one piece with the strand casing. This allows, in particular, a particularly simple assembly of the drive system. Because the sealing element is held captive on the strand casing as a result of the one-piece design with the strand casing and can be inserted together with the strand casing into the passage channel of the drive housing.

In a further embodiment of the invention, the sealing element is formed from a plastic material which is integrally molded onto an outer jacket surface of the strand casing. This enables a particularly simple and inexpensive production. Simultaneously, a simplified assembly is achieved, because the sealing element can be inserted into the passage channel together with the strand casing as a result of the material connection with the outer jacket surface of the strand casing. This means that separate handling of the sealing element during assembly can be dispensed with.

In a further embodiment of the invention, the sealing element has at least one first ring section extending in the radial direction between the strand casing and the duct wall and circumferentially, the outer circumference of which forms a first sealing lip which interacts in a fluid-tight manner with the duct wall. With this design of the sealing element, a simple structure with a reliable seal is achieved. The ring section has a circular ring and / or circular disk shape. The outer circumference of the ring section contacts the duct wall in a circumferential direction and in this way forms the first sealing lip.

In a further embodiment of the invention, the first ring section is inclined obliquely in the direction of an outside of the passage channel, as a result of which pressurization of the passage channel from the outside causes increased pressing of the sealing lip against the channel wall. The outside of the passage channel faces away from an inside of the passage channel in the axial direction, the latter opening into a receiving space of the drive housing that accommodates the at least one drive element. Due to the inclination of the first ring section in the direction of the outside, the sealing element has a bulbous, concave and / or arched shape in sections, at least in the area of the first ring section. The application of pressure emanating from the outside therefore effects a radial force component on the first ring section and thus also on the first sealing lip. The first sealing lip is thus pressed against the duct wall to a greater extent in the radial direction. In other words, in this embodiment of the invention, the sealing element has a self-reinforcing sealing effect.

In a further embodiment of the invention, the sealing element has at least one second ring section which is arranged axially spaced apart from the first ring section and the outer circumference of which forms a second sealing lip which interacts in a fluid-tight manner with the duct wall. This is a particularly advantageous embodiment of the invention. The first ring section and the second ring section are preferably configured to be uniform, preferably identical, to one another. The same applies preferably to the first sealing lip and the second sealing lip. With this embodiment of the invention, an improved and / or redundant sealing effect can be achieved in comparison to an embodiment with only one ring section and thus also only one sealing lip.

In a further embodiment of the invention, at least one holding element assigned to the strand casing is provided, which on its inner circumference acts in a force-transmitting manner with the strand casing and on its outer circumference in a form-fitting manner with the duct wall of the passage, whereby the strand casing is positively fixed to the drive housing by means of the holding element. This embodiment of the invention enables a particularly simple attachment of the cable casing to the drive housing. On its inner circumference, the holding element can interact with the strand casing in a form-fitting, non-positive and / or cohesive manner. On its outer circumference, the holding element interacts with the duct wall in a form-fitting manner. The form fit acts at least in the axial direction of the passage channel and / or in the axial direction of the strand casing. The at least one holding element and the at least one sealing element are preferably fixed so that they cannot be displaced relative to the strand casing and thus also relative to one another, at least in the axial direction.

In a further embodiment of the invention, the holding element is formed in one piece with the strand sheath. This enables a particularly simple assembly. Because of the one-piece design with the strand casing, the holding element is held captive on the strand casing and can be inserted into the passage channel together with it.

In a further embodiment of the invention, the holding element is formed from a plastic material which is integrally molded onto an outer jacket surface of the strand casing. This enables a particularly simple and inexpensive manufacture, while at the same time the assembly is simplified. The at least one holding element is preferably made from a dimensionally stable plastic material, in particular from a thermoplastic polymer.

In a further embodiment of the invention, the holding element is arranged in front of the sealing element in the axial direction, starting from an outside of the passage channel. As a result, the sealing element is protected from any direct action emanating from the outside of the passage channel. In particular, it is avoided that coarse dust, dirt, direct water jets or the like can reach the sealing element directly. Rather, such influences are kept from the sealing element by means of the retaining element arranged upstream in the axial direction. The combined arrangement of the holding element and the sealing element enables a further improved sealing effect and prevents the sealing element from being impaired. These The embodiment of the invention is therefore particularly advantageous.

In a further embodiment of the invention, the strand sheath can be fixed positively to the drive housing by means of the holding element at least in a first holding position and in a second holding position axially spaced apart from the first holding position, the sealing element in the first holding position and in the second holding position being fluid-tight with the duct wall cooperates. This embodiment of the invention makes it possible to compensate for manufacturing and / or operational differences in length of the strand casing and thus also of the drive transmission train encased by the strand casing. This is because the strand casing can be positioned differently in the axial direction relative to the drive housing, namely in the first holding position or the second holding position, on the drive housing. The sealing element interacts with the duct wall in a fluid-tight manner in each of the holding positions. In this embodiment of the invention, the sealing element preferably has a plurality of ring sections, namely at least the first ring section and the second ring section. In the different holding positions, the plurality of ring sections can interact with the channel wall in a fluid-tight manner at the same time. Alternatively, different ring sections can disengage from the channel wall in the different holding positions, with at least one of the ring sections remaining in fluid-tight contact with the channel wall.

In a further embodiment of the invention, the holding element has at least one first profile section, which in the first holding position interacts in an axially form-fitting manner with a complementary first counter-profile section of the duct wall and which in the second holding position interacts in an axially form-fitting manner with an axially spaced, complementary second counter-profile section of the duct wall. The at least first profile section can in particular be a radial protrusion or a radial depression. For example, the first profile section can be designed as a circular ring or circular disk. The first profile section is preferably oriented coaxially to the strand casing and / or the passage channel. The mating profile sections of the channel wall are correspondingly complementary and thus preferably each designed as a radial elevation or radial depression.

In a further embodiment of the invention, the first profile section and the first counter-profile section and / or the first profile section and the second counter-profile section interact to form a meandering sealing gap which has a sealing effect in addition to the sealing element. This is a particularly preferred embodiment of the invention. This is because the holding element and the channel wall form a type of labyrinth seal in the area of the first profile section, the first counter-profile section and / or the second counter-profile section. This is formed by the meandering sealing gap. In this way, a further improved sealing effect can be achieved.

The invention also relates to a functional device, in particular a tank flap device, for a motor vehicle, with at least one functional element, in particular a tank flap element, which can be displaced in an adjustable manner between a first position and a second position, and with a drive system according to the preceding description, the drive transmission train of which for the driven displacement of the functional element, in particular of the tank flap element, is operatively connected to the same.

• 1 zeigt in schematischer Perspektivdarstellung eine Ausführungsform einer erfindungsgemäßen Funktionsvorrichtung in Form einer Tankklappenvorrichtung mit einem Tankklappenelement, das mittels einer Ausführungsform eines erfindungsgemäßen Antriebssystems stellbeweglich verlagerbar ist und eine Freigabestellung einnimmt,
• 2 eine weitere perspektivische Darstellung der Tankklappenvorrichtung nach 1 in einer auf eine Rückseite gerichteten Blickrichtung, wobei das Tankklappenelement eine Abdeckstellung einnimmt,
• 3 eine vergrößerte, perspektivische Detaildarstellung der Tankklappenvorrichtung nach den 1 und 2 im Bereich eines Antriebsgehäuses des Antriebssystems, wobei eine Gehäuseoberschale des Antriebsgehäuses zeichnerisch ausgeblendet ist,
• 4 eine vergrößerte Längsschnittdarstellung in einem Bereich IV nach 3 und somit im Bereich einer stirnendseitig in einen Durchlasskanal des Antriebsgehäuses eingesetzten Stranghülle,
• 5 in schematischer Perspektivdarstellung eine weitere Ausführungsform eines erfindungsgemäßen Antriebssystems, wobei das Antriebssystem lediglich abschnittsweise im Bereich des Durchlasskanals des Antriebsgehäuses und unter zeichnerischer Ausblendung einzelner Bauteile und/oder Abschnitte dargestellt ist, und
• 6 das Antriebssystem nach 5 in einer der 5 entsprechenden abschnittsweisen Darstellung in einer radial auf den Durchlasskanal gerichteten Blickrichtung.

Further advantages and features of the invention emerge from the claims and from the following description of preferred exemplary embodiments of the invention, which are illustrated with reference to the drawings.

• 1 shows a schematic perspective illustration of an embodiment of a functional device according to the invention in the form of a tank flap device with a tank flap element which can be displaced in an adjustable manner by means of an embodiment of a drive system according to the invention and which assumes a release position,
• 2 a further perspective view of the tank flap device according to FIG 1 in a direction of view directed towards a rear side, the tank flap element assuming a covering position,
• 3 an enlarged, perspective detail view of the tank flap device according to the 1 and 2 in the area of a drive housing of the drive system, an upper housing shell of the drive housing being hidden in the drawing,
• 4th an enlarged longitudinal sectional view in a region IV according to FIG 3 and thus in the area of a strand casing inserted into a passage channel of the drive housing at the end,
• 5 a schematic perspective view of a further embodiment of a drive system according to the invention, the drive system being shown only in sections in the area of the passage channel of the drive housing and with individual components and / or sections being drawn out, and
• 6th the drive system according to 5 in one of the 5 corresponding section-wise representation in a viewing direction directed radially towards the passage.

According to the 1 and 2 is a functional device in the form of a tank flap device 1 intended for a passenger car. The fuel filler flap device 1 has a tank flap element 2 on, which is described in more detail between a release position ( 1 ) and a cover position ( 2 ) driven is displaceable adjustable. In the present case, the passenger car is an electrically driven passenger car, so that the tank flap device 1 also as a loading flap device and the tank flap element 2 can also be referred to as a loading flap element.

The tailgate device 1 is assigned to a loading recess area of the passenger vehicle, not shown in detail, in which an electrical charging socket is arranged in a basically known manner. In the based 1 The loading flap element gives the apparent release position 2 the said charging recess area free, so that the charging socket is accessible from the outside for establishing a charging connector. In the release position ( 1 ) is the loading flap element 2 pivoted outward about an unspecified pivot axis and protrudes approximately at right angles from the loading cavity area. In contrast, the loading recess area is in the cover position ( 2 ) by means of the loading flap element 2 Covered inaccessible from the outside. The loading flap element is in the covering position 2 essentially aligned with the body sections of the passenger car surrounding the loading trough area. On an outside of the loading flap element 2 a cladding or planking can be attached, which is adapted to the surrounding body sections with regard to its coloring and / or design.

In the embodiment shown, the loading flap device 1 a support structure 3 on, which is mounted in a ready-to-use state on the vehicle in the area of the loading bay. The supporting structure 3 delimits a loading opening 4th , behind which the said charging socket is arranged in the ready-to-use assembled state. The loading opening 4th is released in the release position and in the cover position by means of the loading flap element 2 covered. The loading flap element 2 is relative to the support structure in the embodiment shown 3 pivotable between the cover and the release position and, for this purpose, pivotable about the said pivot axis on the support structure 3 stored. The supporting structure 3 is assembled from several unspecified plastic injection-molded components, but this does not necessarily have to be the case.

For driven displacement of the loading flap element 2 the loading flap device has between the cover position and the release position 1 a drive system 5 on. The drive system 5 has a drive element 6th on ( 3 ) around an axis of rotation 7th rotatable in a drive housing 8th ( 1 , 2 ) stored and - in which based on the 1 and 2 visible, ready-to-use assembled condition - torque-transmitting with a drive motor 9 is effectively connected. The drive motor 9 In the embodiment shown, it is designed as an electric motor and is connected in a basically known manner to an on-board electrical system of the passenger vehicle and can be controlled via a control device of the passenger vehicle. Next, the drive system 5 an elongated drive transmission train 10 on ( 3 , 4th ) passing through a passage 11 ( 4th ) of the drive housing 8th in the drive housing 8th extends into it and on the drive element 6th attacks. This is how the drivetrain is 10 by means of a rotation of the drive element 6th around the axis of rotation 7th translationally displaceable for the transmission of drive forces to the loading flap element 2 power-transmitting, operatively connected output element 12th . The output element 12th is in the embodiment shown rotatable about an unspecified axis of rotation in an output housing 13th stored. In addition, the drive system 5 a strand sheath 14th on, which ends in the passage channel 11 is used and the drive transmission train 10 at least in the area of the passage channel 11 envelops ( 3 , 4th ).

The drive system 5 also has one of the strand sheath 14th assigned sealing element 15th on ( 3 , 4th ) on its inner circumference 16 fluid-tight with the strand sheath 14th and on its outer circumference 17th fluid-tight with a channel wall 18th of the passage channel 11 cooperates. This is the drive housing 8th by means of the sealing element 15th against penetration of moisture through the passage channel 11 sealed fluid-tight.

The drive system 5 is a cable drive system in the embodiment shown. The drivetrain is accordingly 10 in this case a rope strand. The drive element 6th in the present case is a drive cable drum.

The rope strand 10 engages the drive cable drum in a fundamentally known manner in a force-transmitting manner 6th at. The rope line engages at the same time 10 on said output element 12th on, which is designed as an output cable drum in the present case. The rope strand 10 forms in the embodiment shown a closed loop between the Drive cable drum 6th and the output cable drum 12th is extended. However, such a design as a closed loop is not mandatory. How further in particular with the help of the 1 and 2 can be seen is the rope strand 10 along an unspecified laying path within an installation space available on the motor vehicle side between the drive cable drum 6th and the output cable drum 12th relocated. By means of a driven rotation of the drive cable drum 6th around the axis of rotation 7th is the rope strand 10 thus translationally displaceable along the laying path and runs almost endlessly around the drive cable drum 6th and the output cable drum 12th around. In this way there is a torque of the drive motor 9 via the drive cable drum 6th on the rope 10 and from this via the output cable drum 12th - in a way that cannot be seen in detail - for relocating the loading flap element 2 transferable to the same.

Due to the present design of the rope strand 10 the rope strand shows as a closed loop 10 in this case a first dream 19th and a second strand 20th on ( 3 ). Depending on the direction of rotation of the drive cable drum 6th can do the first dream 19th also as a load strand and the second strand 20th can also be referred to as a slack strand or vice versa. Starting from one around the axis of rotation 7th clockwise rotation of the drive cable drum 6th the rope runs 10 in the area of the first run 19th through the passage 11 in the drive housing 8th and runs in the area of the second run 20th through an unspecified further passage channel from the drive housing 8th the end. Here is the rope strand 10 in the area of the second run 20th enveloped in a corresponding manner by an unspecified further strand sheath. Because their design and function in the area of the drive housing 8th the strand sheath 14th of the rope strand 10 corresponds to, to avoid repetitions, is only on the rope strand 10 in the area of the first run 19th and the design of the strand sheath there 14th as well as the passage channel 11 and insofar on the basis 3 apparent area IV is referred to. What has been said about this applies mutatis mutandis to the area of the cable casing in that from the drive housing 8th expiring second strand 20th .

The rope strand 10 is intended for the transmission of tensile forces and is designed to be flexible and resistant to tension in a basically known manner. For this purpose, the rope strand 10 for example, twisted together from fibers or wires or designed like a cable.

The strand sheath 14th serves to support and guide the rope strand in a slidable manner 10 during its translational displacement along the laying path. The strand sheath 14th In the present case, it is designed to be flexible and rigid. For example, the strand sheath 14th be made of a sufficiently dimensionally stable plastic.

The drive housing 8th has a lower housing shell in the embodiment shown 8a and a housing upper shell 8b on ( 1 , 2 ), which are joined by unspecified screw connections. Based on 3 and 4th is the drive housing 8th with graphic masking of the upper shell of the housing 8b shown. The passage channel 11 is in the embodiment shown in the area of an unspecified parting line between the lower housing shell 8a and the upper shell of the housing 8b between an outside A and an inside I. extends.

How further based on 4th shown is the strand sheath 14th coaxially in the passage 11 used. The sealing element 15th is coaxial with the strand sheath 14th and thus also coaxial with the passage channel 11 oriented. The sealing element 15th is in the embodiment shown in the axial direction on one of the inside I. facing end region of the strand sheath 14th arranged and fixed to the strand sheath in a manner to be described in more detail 14th tied together.

In the embodiment shown, the sealing element is 15th cohesively with an outer jacket surface 21 the strand sheath 14th tied together. This is the purpose of the sealing element 15th made of a plastic material K to the outer circumferential surface 21 injected. This results in an integral, cohesive design of the strand casing 14th with the sealing element 15th achieved.

How further based on 4th is shown, the sealing element 15th one in the radial direction R. the strand sheath 14th between the strand sheath 14th , more precisely: the outer circumferential surface 21 , and the canal wall 18th extended and circumferential first ring section 22nd on. Its outer circumference forms a first sealing lip 23 . The first sealing lip 23 is in the radial direction R. against the canal wall 18th employed and interacts with the same in a fluid-tight manner.

The ring section 22nd has a circular ring and / or circular disk-shaped basic shape ( 3 ). Here is the ring section 22nd in the axial direction obliquely towards the outside A. inclined. In other words, is the ring section 22nd in relation to the outside A. designed concave, convex and / or arched. One from the outside A. outgoing pressurization of the passage channel 11 therefore leads to increased pressure on the sealing lip 23 to the canal wall 18th . Thus, also from a self-reinforcing sealing effect of the sealing element 15th be spoken.

How particularly with the 3 and 4th shown is one of the strand sheath 14th associated holding element 24 intended. The holding element 24 acts on its inner circumference 25th power-transmitting with the strand sheath 14th , more precisely: their outer circumferential surface 21 , and on its outer circumference 26th form-fitting with the duct wall 18th of the passage channel 11 together.

This is how the strand sheath is 14th by means of the holding element 24 form-fitting on the drive housing 8th set.

The holding element 24 is coaxial with the strand sheath 14th and thus also coaxial with the passage channel 11 and / or the sealing element 14th arranged.

The holding element 24 is made of a plastic material in the embodiment shown K ' manufactured. The plastic material K ' is used to form the retaining element 24 to the outer circumferential surface 21 the strand sheath 14th injected. This creates the strand sheath 14th and the holding element 24 integrally connected.

For a positive connection with the drive housing 8th has the holding element 24 in the present case one on the outer circumference 26th trained profiling 27 , 28 on that with a complementary counter-profile 29 , 30th of the passage channel 11 or the duct wall 18th cooperates.

In the embodiment shown, the holding element 24 a first profile section 27 and a second profile section 28 on. The first profile section 27 and the second profile section 28 are arranged at a distance from one another in the axial direction. The passage channel 11 or its channel wall 18th accordingly has a first mating profile section 29 and a second mating profile section 30th on. The profile sections 27 , 28 and the counter profile sections 29 , 30th work together in an axially form-fitting manner.

In the embodiment shown, the profile sections are 27 , 28 of the holding element 24 each than in the radial direction R. extended projections designed. This forms the profile sections 27 , 28 each a kind of radial collar. The counter profile sections 29 , 30th are accordingly as in the radial direction R. extended depressions in the channel wall 18th educated. This forms the counter-profile sections 29 , 30th in each case a circumferential groove in which the respective profile section 27 , 28 is fixed.

For assembling the strand cover 14th and the rope strand guided in this 10 becomes the strand sheath 14th together with the holding element 24 and the sealing element 15th in a separated state of the lower housing shell 8a and the upper shell of the housing 8b in the radial direction R. into the passage channel, which is then divided in half 11 used (cf. 3 ). After that, the drive housing 8th by attaching and screwing the upper shell of the housing 8b closed, whereby the retaining element 24 and with it the strand sheath 14th also in the radial direction R. form-fitting in the passage channel 11 are held.

How further based on 4th is shown is the retaining element 24 in the axial direction starting from the outside A in front of the sealing element 15th arranged. This is the sealing element 15th advantageously protected from direct external influences.

In addition, form the first profile section 27 and the first mating profile section 29 one in the radial direction R. and axial direction several times deflected and thus meander-shaped sealing gap S. the end. The sealing gap S. settles in the area of the second profile section 28 and the second counter-profile section 30th proceed in the axial and radial directions. The meandering sealing gap S. in this way forms a kind of labyrinth seal and has one facing the sealing element 15th additionally acting sealing effect.

Based on 5 and 6th is a further embodiment of a drive system according to the invention only in sections in the area of a passage channel 11a shown. In order to avoid repetition, only the essential differences are referred to below on the basis of the 5 and 6th Embodiment shown received. The basic structure and functionality of the 5 and 6th apparent drive system agree with the 1 until 4th discussed drive system 5 match. That there about the drive system 5 What has been said applies mutatis mutandis with regard to the embodiment according to 5 and 6th . The main differences relate to the design of the holding element 24a and the sealing element 15a .

The sealing element 15a points in contrast to the sealing element 15th several ring sections 22a , 22b , 22c , namely a first ring section 22a , a second ring section 22b and a third ring section 22c on. These each form a channel wall on their respective outer circumference 18a of the passage channel 11a fluid-tight contacting sealing lip, namely a first sealing lip 23a , a second sealing lip 23b and a third sealing lip 23c . The ring sections 22a until 22c and thus also the sealing lips 23a until 23c are in the axial direction of the sealing element 15a spaced from each other arranged. Incidentally, the ring sections are 22a until 22c and the sealing lips 23a until 23c designed identically in terms of their shape and dimensions in the embodiment shown.

The holding element 24a has a first profile section 27a and a second profile section 28a on. The case 8th' points in the area of the passage channel 11a again a complementary counter-profile, namely a first counter-profile section 29a and a second mating profile section 30a on.

In contrast to the drive housing 8th has the drive housing 8th' one in the axial direction between the holding element 24a and the sealing element 15a arranged recess 31a on. The recess 31a is in the radial direction R. Grooved in the circumferential direction both in the lower housing shell 8a ' as well as in the upper housing shell, not shown, of the drive housing 8th' extends. Here is the recess 31a coaxial with the holding element 24a and the sealing element 15a .

In contrast to the embodiment according to the 1 until 4th is the strand cover 14th the embodiment according to the 5 and 6th by means of the holding element 24a in different holding positions positively on the drive housing 8th' definable. Here is the sealing element 15a irrespective of the respective holding position, it is always fluid-tight with the duct wall 18a in contact.

In the 5 and 6th takes the strand sheath 14th together with the holding element 24a and the sealing element 15a a first stop position. The first profile section acts in this first holding position 27a with the first mating profile section 29a together. The second profile section 28a acts with the second counter-profile section 30a together. All sealing lips are at the same time 23a until 23c with the canal wall 18a in contact.

The strand sheath 14th is alternatively in a second holding position on the drive housing 8th' definable. Another alternative is the strand sheath 14th in a third holding position on the drive housing 8th' definable. Both of the aforementioned holding positions are not shown in more detail in the drawing and are explained in detail below.

The rope casing is in the second holding position 14th together with the holding element 24a and the sealing element 15a displaced inward in the axial direction in comparison to the first holding position. The first profile section 27a is positively engaged with the second counter-profile section 30a . At the same time is the second profile section 28a out of engagement with the second mating profile section 30a and instead in the recess 31a arranged. As a result of this axial displacement, the third sealing lip is 23c towards the inside I. from the passage 11a displaced and out of engagement with the duct wall 18a . The first sealing lip 23a and the second sealing lip 23b are equally shifted in the axial direction, but still fluid-tight with the channel wall 18a in contact.

The strand casing is in the third holding position 14th together with the holding element 14a and the sealing element 15a compared to the first holding position displaced in the axial direction outward. The second profile section acts here 28a with the first mating profile section 29a together. The first profile section 27a is out of engagement with the first mating profile section 29a and in the axial direction outside the passage channel 11a on the outside A. arranged. The first sealing lip 23a is accordingly displaced outward in the axial direction and in the recess 31a arranged. The second sealing lip 23b and the third sealing lip 23c are the same as the first sealing lip 23a shifted in the axial direction, but still fluid-tight with the channel wall 18a in contact.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 10123420 A1 [0002]

Claims (14)

Drive system (5) for a functional device (1) of a motor vehicle, comprising at least one drive element (6) which is mounted rotatably about an axis of rotation (7) in a drive housing (8, 8 ') and - in a ready-to-use assembled state - transmits torque with a Drive motor (9) is operatively connected, at least one elongated drive transmission line (10) which extends through a passage channel (11, 11a) of the drive housing (8, 8 ') into the same and engages the drive element (6), wherein the drive transmission line (10 ) is translationally displaceable by means of a rotation of the drive element (6) about the axis of rotation (7) for the transmission of drive forces to an output element (12) assigned to the functional device (1), and having at least one strand casing (14) which ends in the passage ( 11, 11a) is inserted and the drive transmission train (10) envelops at least in the area of the passage channel (11, 11a), thereby identified characterized that at least one of the tobacco wrapper (14) associated with the sealing element (15, 15a) is provided, the fluid-tight at its inner periphery (16) with the tobacco wrapper (14) and at its outer periphery (17) fluid-tight with a channel wall (18, 18a) of the passage channel (11, 11 a) cooperates, whereby the drive housing (8, 8 ') is sealed in a fluid-tight manner by means of the sealing element (15, 15a) against the ingress of moisture through the passage channel (11, 11a). Drive system (5) Claim 1 , characterized in that the sealing element (15, 15a) is formed in one piece with the strand casing (14). Drive system (5) Claim 1 or 2 , characterized in that the sealing element (15, 15a) is formed from a plastic material (K) which is integrally molded onto an outer jacket surface (21) of the strand casing (14). Drive system (5) according to one of the preceding claims, characterized in that the sealing element (15, 15a) extends at least one in the radial direction (R) between the strand casing (14) and the duct wall (18, 18a) and circumferentially extending in the circumferential direction (22, 22a), the outer circumference of which forms a first sealing lip (23, 23a) which interacts in a fluid-tight manner with the channel wall (18, 18a). Drive system (5) Claim 4 , characterized in that the first ring section (22, 22a) is inclined obliquely in the direction of an outer side (A) of the passage channel (11, 11a), whereby a pressurization of the passage channel (11, 11a) originating from the outside (11, 11a) is increased The first sealing lip (23, 23a) is pressed against the duct wall (18, 18a). Drive system (5) Claim 4 or 5 , characterized in that the sealing element (15a) has at least one second ring section (22b) which is axially spaced apart from the first ring section (22a) and the outer circumference of which forms a second sealing lip (23b) which interacts in a fluid-tight manner with the duct wall (18a). Drive system (5) according to one of the preceding claims, characterized in that at least one holding element (24, 24a) assigned to the cable casing (14) is provided, which on its inner circumference (25) transmits force with the cable casing (14) and on its outer circumference ( 26) interacts positively with the duct wall (18, 18a) of the passage duct (11, 11a), whereby the strand casing (14) is fixed positively to the drive housing (8, 8 ') by means of the holding element (24, 24a). Drive system (5) Claim 7 , characterized in that the holding element (24, 24a) is formed in one piece with the strand sheath (14). Drive system (5) Claim 7 or 8th , characterized in that the holding element (24, 24a) is formed from a plastic material (K ') which is integrally molded onto an outer jacket surface (21) of the strand casing (14). Drive system (5) according to one of the Claims 7 until 9 , characterized in that the holding element (24, 24a) is arranged in the axial direction in front of the sealing element (15, 15a) starting from an outside (A) of the passage channel (11, 11a). Drive system (5) according to one of the Claims 7 until 10 , characterized in that the strand sheath (14) can be positively fixed to the drive housing (8 ') by means of the holding element (24a) at least in a first holding position and in a second holding position axially spaced apart from the first holding position, the sealing element (15a) in the first holding position and in the second holding position each interacts in a fluid-tight manner with the channel wall (18a). Drive system (5) Claim 11 , characterized in that the holding element (24a) has at least one first profile section (27a) which in the first holding position interacts axially with a positive fit with a complementary first counter-profile section (29a) of the duct wall (18a), and which in the second holding position has an axially positive fit with an axially spaced complementary second counter-profile section (30a) of the duct wall (18a) interacts. Drive system (5) Claim 12 , characterized in that the first profile section (27a) and the first counter-profile section (29a) cooperate to form a meandering sealing gap (S) which has a sealing effect acting in addition to the sealing element (15a). Functional device (1), in particular tank flap device, for a motor vehicle with at least one functional element (2), in particular tank flap element, which can be displaced adjustably between a first position and a second position, and with a drive system (5) according to one of the preceding claims, the drive transmission train (10) of which for the driven displacement of the functional element (2), in particular the tank flap element, is operatively connected to the same.

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