DE102021112496A1 - Roller blind device on a vehicle roof - Google Patents

Abstract

The invention relates to a roller blind device (3) for a vehicle with a roller blind (4) which is wound up on a winding shaft (8) which is rotatably mounted by means of two shaft bearings (9, 10) and prestressed in the winding direction by means of a torsion spring (22), the The winding shaft (8) is formed by two winding shaft tubes (11, 12) through which a central non-rotatable axis (18) passes and which are connected to one another in a rotationally fixed manner by means of a bushing (16), and each winding shaft tube (11, 12) is externally attached to the associated Shaft bearing (9, 10) is rotatably mounted and the bushing (16) is rotatably mounted on the axle (18), characterized in that the torsion spring (22) is inside one of the winding shaft tubes (11, 12) and surrounds the axle (18). and is attached on the one hand to the bushing (16) and on the other hand to a spring support part (26) in the region of the shaft bearing (9) of the winding shaft tube (11) surrounding the torsion spring (22).

Description

The invention relates to a roller blind device for a vehicle with a roller blind web that is wound up on a winding shaft that is rotatably mounted by means of two shaft bearings and is prestressed in the winding direction by means of a torsion spring, the winding shaft being formed by two winding shaft tubes through which a central non-rotating axis passes and by means of a bush are connected to one another in a rotationally fixed manner, and wherein each winding shaft tube is rotatably mounted on the outside of the associated shaft bearing and the bush is rotatably mounted on the axle.

From the DE 10 2018 117 156 A1 a generic roller blind device has become known in which two torsion springs are arranged coaxially next to one another on an axis, each of which initiates its clamping force on the associated winding shaft tube at its centrally arranged end, so that the winding shaft tubes are loaded with reduced torsional force.

The invention is based on the object of creating a roller blind device as mentioned at the outset, which is simplified and improved in its structure.

The object is achieved according to the invention with the roller blind device mentioned at the outset in that the torsion spring is arranged within one of the two winding shaft tubes and surrounding the axis and is fastened on the one hand to the bushing and on the other hand to a spring support part in the region of the shaft bearing of the winding shaft tube surrounding the torsion spring.

Advantageous developments of the invention are specified in the dependent claims.

The use of a single torsion spring is sufficient to ensure the required spring preload on the winding shaft. The force is introduced via the central socket, to which the two winding shaft tubes are attached at least in a rotationally fixed manner. In this way, the torsional load is divided equally between the two tubes and thus reduced for each tube. Undesirable material deformation can be reduced, in particular if the spiral-wound tubes are made of plastic. The bushing is preferably arranged centrally on the winding shaft or between the two winding shaft tubes. The two winding shaft tubes thus have the same length and are formed in the same way.

The bush is expediently rotatably mounted on a bush bearing. If the roller blind device has a continuous one-piece axle, the bushing bearing is expediently fixed to the axle, in particular in the middle of the axle.

If the roller blind device has an axle that is divided in the longitudinal direction and formed in two parts, the bush bearing forms a connecting element that connects the two axle parts of the axle to one another at least in a rotationally fixed manner. On the other hand, the socket can also be rotatably mounted directly on the axle.

The bushing bearing provides a plain bearing for the bushing and therefore includes one or more plain bearing areas along its length at its periphery.

It is particularly preferred that the bush is axially supported on the bush bearing against the tensile force of the torsion spring. Depending on its torsion, the torsion spring generates an axial spring force in addition to the torsional force, which has to be supported by the bushing in the axial direction. The bushing is expediently supported on a supporting collar or the like formed on the bush bearing.

According to a preferred embodiment, it is provided that the bush bearing is fixed by means of a form-fitting element or by means of a locking pin on the axle in the axial direction and expediently also in the direction of rotation. The form-fitting element is z. B. a web-like projection of the bush bearing, which engages in a recess of the axle. The positive-locking element can also be a locking pin that is inserted in the radial direction or on a diameter line through openings in the axle or in the tube of the axle and at the same time passes through a radial bore in the bush bearing or rests against an end face of the bush bearing.

The bush bearing may be formed by two half-shells positioned straddling the axle and retained in the central opening of the bush as a unit of the bush on the axle. The bush bearing can thus be an injection molded part that can be attached to the axle. The bush bearing is z. B. formed in the manner of a clip, the two half-shells z. B. by means of a hinge, film hinges or a material weakening can be pivoted against each other and placed around the axis during assembly and then closed.

On the other hand, the bush bearing can be formed as an overmold over the axle. It is thus fixed both in the axial direction and in the direction of rotation.

It is expediently provided that a casing or an injection molding is attached to the area of the axle or axle part surrounded by the torsion spring. Such a casing can have a noise-dampening or noise-preventing effect when it comes into contact with the torsion spring. The sheathing can, for. B. a plastic extrusion coat or a net-like or tubular jacket or the like, which is mounted on the axle part or on the section of the axle.

According to a preferred embodiment, it is provided that the bushing has two receptacles and in particular slip-on receptacles for the two winding shaft tubes on its circumference. The winding shaft tubes are arranged in a rotationally fixed and axially movable manner on the receptacles or slip-on receptacles, in particular by means of a form fit. In this way, axial compensation is possible when there are changes in the length of the two winding shaft tubes.

According to a further preferred embodiment, it is provided that the axis or the two axis parts is or are bent or curved and that the two winding shaft tubes are formed elastically in such a way that they also adapt to the axis or the two axis parts during rotation Adjust given bend. By means of a bent or curved axis, the roller blind device can be adapted with its winding shaft to a curvature of the roof surface to be shaded in the transverse direction of the vehicle roof.

The torsion spring is expediently fastened to the spring support part which is rotatably mounted between the winding shaft and, in particular, coaxially to the winding shaft.

Provision is preferably made for an adjustment device to adjust the spring support part relative to the winding shaft in order to set a spring preload that is adapted to the extension length of the roller blind. Due to the fact that the spring support part can be adjusted by an adjustment device relative to the winding shaft, the spring preload can be adjusted to the respective extension length of the roller blind. Thus, the spring preload can be adjusted to a desired allowable magnitude or range of magnitudes. An avoidable or impermissible increase in the spring preload can thus be prevented, even when the roller blind is extended to a greater length. Thus, the spring preload set when the roller blind is wound up or when the roller blind is open, e.g. B. be kept largely constant or increase only slightly when the roller blind is unwound from the winding shaft when the blind is closed while rotating.

It is therefore expedient for the adjusting device to rotate the spring support part when the roller blind is unwound in the direction of rotation of the winding shaft, in order to maintain a spring pretension set when the roller blind is wound up or to change it only to a comparatively small extent. When the roller blind is wound up, the spring support part rotates in the winding direction of the winding shaft.

The adjusting device can be designed in different ways. Thus, the adjusting device can have a drive motor such as e.g. B. have an electric motor. The drive or electric motor drives the spring support part, e.g. B. by means of direct coupling or by means of indirect coupling via a coupling element such as an intermediate shaft or a push-pull cable. On the other hand, the drive or electric motor can also form the spring support part or a part of the spring support part. The control of the drive or electric motor is z. B. depending on the rotational position of the winding shaft or the position of the pull bow or the pull bow adjusting drive element.

It is expediently provided that a pull bow is connected to an extension end of the roller blind, is slidably mounted on both sides on a guide rail and can be adjusted for winding and unwinding the roller blind onto or from the winding shaft along the guide rails, in particular by means of a drive device. A pinion is in adjustment engagement with a drive cable, which is connected to the pull bow and can be adjusted in particular by a drive motor.

According to a preferred embodiment, the spring support part or the pinion or the drive wheel can be coupled to the drive cable via a gear mechanism and can be rotationally adjusted by the latter. Such a gear can be used to set a step-up or step-down between the movement of the drive cable and thus the rotation of the winding shaft on the one hand and the rotation of the spring support part on the other hand. Furthermore, the gearbox can be used to adapt the drive cable running to the cable guide and can be designed accordingly. The transmission preferably has a drive pinion, on which the drive cable is drivingly engaged, and an output pinion which is arranged on a common shaft and is in mesh with the pinion which is coupled to the spring support part. However, other gear arrangements with more than two pinions can also be used.

It is expediently provided that one shaft bearing has a bearing journal which rotatably supports a shaft bearing bushing of the associated winding shaft tube and on which the central axis is non-rotatably attached at one end is introduced, and that the other shaft bearing supports the spring support part or a spring adjustment shaft carrying the spring support part so that it can rotate relative to the fixed central axis and to the associated other winding shaft tube.

While in a conventional roller blind device with a tension or torsion spring firmly clamped on both sides, a greater extension length of the roller blind of z. B. 2000 mm would require, for example, about 20 revolutions of the winding shaft and these revolutions of the winding shaft are converted directly into 20 tensioning revolutions of the tensioning or torsion spring, however, in a roller blind device according to the invention by a corresponding adjustment of the spring support part, the pretension of the torsion spring can be changed by z. B. only three clamping revolutions can be set.

Furthermore, the adjusting device can have a drive element such as a drive wheel, a friction wheel, a pinion, a cable drum, a belt drum or a running wheel or the like. Such a drive element is in particular arranged coaxially with the spring support part and is formed on it or connected to it in a rotationally fixed manner. The drive element or drive wheel or the pinion is connected to an adjustment element such. B. a corresponding drive cable or rope or the like in adjustment engagement, which is connected to the Zugspriegel and is adjustable by a drive motor. Such a drive cable is in particular a gradient cable, as z. B. of sunroof drives is known. The drive wheel or the pinion can also be formed by a ring gear which is attached to or on the spring support part. The drive cable can also be a so-called outlet cable, which is formed by the section of the drive cable that runs beyond the drive motor and that is opposite the drive section connected to the pull bow with respect to the drive motor.

Furthermore, the roller blind can also be actuated by manually moving the pull bow, the coupling between the pull bow and the drive element z. B. can be done by means of a drive cable or by means of a cable.

Basically, the roller blind device can be arranged under a vehicle roof as well as behind a vehicle window and the extension direction is possible due to a corresponding arrangement of the winding shaft and the guide rails in different directions.

A flat covering or shading element is referred to as a roller blind. B. is formed from a fabric or a film.

The roller blind device according to the invention thus makes it possible, by selecting a diameter of the pinion connected to the spring support part and/or by designing the gearing, to achieve very flat, slightly degressive or "dish-shaped" or also almost constant spring characteristics of the torsion spring over the entire extended length of the roller blind can, so that very long extension lengths such as at least 2000 mm can be achieved. The torsion spring is preferably installed in such a way that it is strongly or maximally prestressed in the open position. If the blind is closed, the torsion spring is tensioned by the unwinding of the blind web from the winding shaft, with the drive cable moving along with the closing movement of the blind. The spring end of the torsion spring, which is mounted on the spring support part, is driven by the revolving pinion and relieves the torsion spring, so that the desired spring characteristic results from the superimposition. It is possible, for example, that the torsion spring itself only experiences approx. 3 tensioning turns over a pull-out distance of 2000 mm instead of 20 tensioning turns in a conventional roller blind device.

Since the ratio of spring tension and relaxation is not constant due to the changing winding diameter of the roller blind on the winding shaft, different types of characteristic curves can be generated by the diameter of the pinion coupled to the spring support part or by adjustable gear ratios.

The transmission or its components can, for. B. be integrated on the spring support and the pinion, z. B. by injection molding.

The adjusting drive can take place via the drive cable on its drive section connected to the pull bow or via the outlet cable, which then has to be a little longer on one side. When using the outlet cable, the course of the drive cable, the package of the roller blind centering and the connection to the pinion are more flexible.

• 1 in einer Draufsicht ein Fahrzeug mit einem Fahrzeugdach, das einen transparenten Dachabschnitt und eine Rollovorrichtung zum Abschatten des Dachabschnitts aufweist;
• 2 in einer isometrischen Ansicht in Explosionsdarstellung eine Wickelwelle der Rollovorrichtung mit beidseitigen Wellenlagern und weiteren Bauteilen;
• 3 in einer isometrischen Ansicht die in 2 dargestellten Bauteile in Einbaustellung;
• 4 in einer isometrischen Ansicht in vergrößerter Darstellung einen zentralen Bereich der Wickelwelle;
• 5 in einer horizontalen Draufsicht die Anordnung der 3;
• 6 in einer Längsschnittansicht einen mittigen Verbindungsbereich von zwei die Wickelwelle bildenden Wickelwellenrohren;
• 7 in einer Längsschnittansicht den mittigen Verbindungsbereich der zwei die Wickelwelle bildenden Wickelwellenrohren;
• 8 in einer isometrischen Ansicht in Explosionsdarstellung die in 7 dargestellten Bauteile;
• 9 in einer Längsschnittansicht in schematischer Darstellung eine Ausführungsform des Verbindungsbereichs der beiden Wickelwellenrohre;
• 10 in einer Längsschnittansicht eine weitere Ausführungsform des Verbindungsbereichs der beiden Wickelwellenrohre;
• 11 in einer Längsschnittansicht eine weitere Ausführungsform des Verbindungsbereichs der beiden Wickelwellenrohre;
• 12 in einer Längsschnittansicht eine weitere Ausführungsform des Verbindungsbereichs der beiden Wickelwellenrohre;
• 13 in einer Längsschnittansicht eine weitere Ausführungsform eines an einer zentralen Achse angeordneten Buchsenlagers;
• 14 in einer Längsschnittansicht eine weitere Ausführungsform eines an einer zentralen Achse angeordneten Buchsenlagers;
• 15 in einer Längsschnittansicht eine weitere Ausführungsform eines an der zentralen Achse angeordneten Buchsenlagers;
• 16 in einer Querschnittsansicht das an der Achse zu montierende Buchsenlager;
• 17 in einer Querschnittsansicht eine weitere Ausführungsform des an der Achse zu montierenden Buchsenlagers; und
• 18 in einer Längsschnittansicht ein Wellenlager mit einer Verstelleinrichtung für eine die Wickelwelle vorspannenden Drehfeder.

The invention is explained in more detail below using exemplary embodiments of a roller blind device according to the invention for a vehicle with reference to the drawing. It shows:

• 1 in a top view, a vehicle with a vehicle roof that has a transparent roof section and a roller blind device for shading the roof section;
• 2 in an isometric view in an exploded view, a winding shaft of the roller blind device with shaft bearings on both sides and other components;
• 3 in an isometric view the in 2 components shown in the installed position;
• 4 in an isometric view in an enlarged representation a central area of the winding shaft;
• 5 in a horizontal plan view the arrangement of the 3 ;
• 6 in a longitudinal sectional view, a central connection area of two winding shaft tubes forming the winding shaft;
• 7 in a longitudinal sectional view, the central connection area of the two winding shaft tubes forming the winding shaft;
• 8th in an exploded isometric view the in 7 components shown;
• 9 in a longitudinal sectional view in a schematic representation an embodiment of the connection area of the two winding shaft tubes;
• 10 in a longitudinal sectional view a further embodiment of the connection area of the two winding shaft tubes;
• 11 in a longitudinal sectional view a further embodiment of the connection area of the two winding shaft tubes;
• 12 in a longitudinal sectional view a further embodiment of the connection area of the two winding shaft tubes;
• 13 in a longitudinal sectional view, a further embodiment of a bush bearing arranged on a central axis;
• 14 in a longitudinal sectional view, a further embodiment of a bush bearing arranged on a central axis;
• 15 in a longitudinal sectional view, a further embodiment of a bush bearing arranged on the central axis;
• 16 in a cross-sectional view, the bush bearing to be mounted on the axle;
• 17 in a cross-sectional view a further embodiment of the bush bearing to be mounted on the axle; and
• 18 in a longitudinal sectional view, a shaft bearing with an adjusting device for a torsion spring that pretensions the winding shaft.

A vehicle such as B. a car has a vehicle roof 1 with a transparent roof section 2, the z. B. is formed by a glass cover of a sunroof or a fixed roof part or roof section. A roller blind device 3 with a roller blind web 4 for shading the transparent roof section 2 is arranged under the transparent roof section 2 . The roller blind 4, the z. B. is made of a fabric or a film or the like, has at its free front edge or pull-out end a Zugspriegel 5, which is slidably mounted at its two lateral ends 6 each on a lateral running in the longitudinal direction of the roof guide rail 7. The roller blind device 3 has a winding shaft 8 which is mounted on the vehicle roof 1 in a transverse orientation z. B. is arranged behind the roof section 2 to be shaded and is rotatably mounted on end-side shaft bearings 9 and 10 . The shaft bearings 9 and 10 are z. B. arranged on a roller blind frame attached to the vehicle roof 1 . The two shaft bearings 9 and 10 are arranged in particular in the area of the rear ends of the two guide rails 7 with respect to the longitudinal direction of the roof.

The winding shaft 8 is formed from two winding shaft tubes 11 and 12 which are non-rotatably connected to one another at their inner ends. The roller blind 4 is fixed at its rear edge or rear end to the two winding shaft tubes 11 and 12 and wound onto them. Each guide rail 7 has a cable guide 13 on which a drive cable 14 is slidably mounted. The drive cable 14 is connected on the one hand to a bow slider (not shown) which is arranged at the lateral end 6 of the pull bow 5 and which is slidably mounted on the guide rail 7, and on the other hand to a drive motor 15, e.g. B. an electric geared motor z. B. is arranged on the blind frame, adjustable. Using the two drive cables 14, the pull bow 5 can be adjusted along the two guide rails 7 for winding and unwinding the roller blind 4 onto or from the spring-loaded winding shaft 8 or from the winding shaft tubes 11 and 12, so that a desired shading position of the Roller blind 4 can be adjusted.

A bushing 16 connects the two winding shaft tubes 11 and 12 to one another in a torque-proof manner. The centrally located bushing 16 has a central through bore or cylindrical opening 17 . The roller blind device 3 contains a central axis 18, which is mounted on both sides on the shaft bearings 9 and 10 and is non-rotatably fixed at least at one end. The axis 18 extends through the winding shaft tubes 11 and 12 and through the bushing 16. The central axis 18, which z. B. is formed by a steel tube, according to one embodiment (see 2 until 9 ) divided in two and formed by two axle parts 19 and 20, which are in particular steel tubes and which are connected to one another by means of a connecting element 21. The rigid central axle 18 has a gebo in its one-piece form as well as in the two-piece form Gene or curved shape, being arranged in its installed position on the roller blind device 3 with preferably upward curvature.

The two winding shaft tubes 11 and 12 of the winding shaft 8 are made in particular as plastic tubes or corrugated tubes so flexible that they can adapt to the course of the curved central axis 18 in the rest position as well as during its rotation by elastic deformation.

A torsion or torsion spring 22, which is formed helically or helically and can deform elastically torsionally under torsional loading, is located in a cylindrical space 23 (see FIG 9 ) between the one or left winding shaft tube 11 (according to the left winding shaft tube 11 2 ) and the associated left axle part 19 and surrounds the axle part 19 with radial play. The torsion spring 22 is firmly attached to the socket 16 at its inner end on the one hand. A fixing point 24 of the bushing 16 contains, for example, a protrusion (see 6 and 7 ), in which a hook end 25 of the torsion spring 22 is suspended. The other end of the torsion spring 22 is on the left shaft bearing 9 z. B. firmly attached. Alternatively, the other end of the torsion spring 22 can be attached to a spring support part 26 ( 2 ), which is rotatably mounted on the left shaft bearing 9 coaxially to the winding shaft 8 or to the winding shaft tube 11 and can be adjusted relative to the winding shaft 8 by means of an adjustment device for setting a spring preload adapted to the extension length of the roller blind 4 (see the following explanation for the in 18 illustrated embodiment).

The spring support part 26 is coaxially and non-rotatably connected at its end facing the left-hand shaft bearing 9 to a spring adjustment shaft 27, which is rotatably mounted on the shaft bearing 9 and a pinion 28 (see exemplary arrangement according to 18 ) which is arranged on the outside of a bearing wall 29 of the shaft bearing 9 . The spring adjustment shaft 27 forms a rotary bearing for a shaft bearing bushing 30 on which the left-hand winding shaft tube 11 is attached in a rotationally fixed manner. The winding shaft 8 or the right-hand winding shaft tube 12 is rotatably mounted on a bearing journal 32 of the right-hand shaft bearing 10 by means of a right-hand shaft bearing bushing 31 . The right axle part 20 or the axle 18 is also attached to the bearing pin 32 in a rotationally fixed manner.

According to one embodiment ( 2 until 9 ), the axle 18 is formed from the two axle parts 19 and 20, which are connected to one another in a rotationally fixed manner by means of the connecting element 21. The connecting element 21, which is in particular a substantially rotationally symmetrical part, has a coaxial pin 33 and 34 at each of its two ends. Each pin 33, 34 is inserted without play or firmly pressed into an open tubular end of the associated axle part 19 or 20. For sole or additional anti-rotation, the pin 33, 34 has an increase such. B. a web 35 running in the axial direction. The web 35 engages in an associated slot-shaped groove 36 which is formed at the end of the axle part 19 or 20 in its tube wall in the axial direction. The connecting element 21 forms a bush bearing 37 on which the bush 16 is rotatably mounted. The connecting element 21 has a radially projecting collar 38 which is formed adjacent to the pin 33 for the left-hand axle part 19 and on whose annular collar or support surface 39 an associated annular end face 40 of the bushing 16 is axially supported. The axial support of the bushing 16 takes place due to the spring tension of the torsion spring 22 in the axial direction. The bush bearing 37 contains z. B. two plain bearing sections 41 and 42 ( 8th ), which are axially spaced from each other and have a diameter that is larger than the diameter of a central cylindrical part of the connecting element 21. The two sliding bearing sections 41, 42 form the sliding bearing of the bushing 16 in its cylindrical opening 17.

The axle part 19 surrounded by the torsion spring 22 has a plastic casing 43 which, when it comes into contact with the torsion spring 22, has a noise-dampening or noise-preventing effect. The casing 43 can, for. B. be an overmolding or a net-like or tubular coat that is mounted on the axle part 19.

The bushing 16 contains on its circumference two receptacles and in particular slip-on receptacles 44 and 45, on which the winding shaft tubes 11 and 12 are plugged coaxially with their open ends. A positive rotation lock of each winding shaft tube 11 and 12 relative to the socket 16 is z. B. by a radially projecting lug 46 which engages in an axial longitudinal recess 47 of the winding shaft tube 11 and 12 respectively. Each winding shaft tube 11 and 12 can be moved in the axial direction on the slip-on mount 44 or 45 to the extent required for axial length compensation. The bushing 16 has in its center between the two mounting receptacles 44 and 45 a radially expanded support area 48 whose diameter corresponds to the outer diameter of the winding shaft tubes 11 and 12 so that a uniform cylindrical winding surface for the roller blind 4 is provided. The support area 48 is formed, for example, by three annular ribs arranged next to one another (see FIG 6 until 8th ) educated.

In the other right-hand winding shaft tube 12, in which no torsion spring 22 is contained, at least one annular support part 49 is expediently arranged, which is arranged without play via a central cylindrical opening 50 on the axle part 20. The support part 49 is inserted with its outer circumference 51 without play into the winding shaft tube 12, so that it provides axial support or bracing of the winding shaft tube 12 on the axle part 20, but allows a relative sliding movement. The support part 49 maintains a constant distance between the winding shaft tube 12 and the central axis 18, particularly when the winding shaft 8 is curved.

In another embodiment ( 10 ) the axle 18 is in one piece and thus has improved stability. The bushing 37 is disposed on the axle 18 with the axle 18 extending through a central cylindrical opening 52 of the bushing 37 . The bush bearing 37 has a radial through bore 53 which extends through its enlarged collar 38 . The axle 18 or the steel tube has a radial axle bore 54 which is arranged coaxially with the through bore 53 of the bush bearing 37 mounted on the axle 18 . A locking pin 55, e.g. B. a cylinder pin or steel pin, passes through the holes 53 and 54, so that the bush bearing 37 is secured to the axis 18 both axially and non-rotatably.

In another embodiment ( 11 ) the axle 18 is also in one piece. The bush bearing 37 arranged on the axle 18 contains a web 56 which projects into the central cylindrical opening 52 on the inside and engages in an associated recess 57 in the axle 18 . This combination of web 56 and recess 57 also forms an axial lock and a rotation lock by positive locking. The bush bearing 37 is z. B. formed as a clip (see 16 ), which is formed from two half-shells 58 and 59 which are connected to one another in a common pivoting area 60 and can be pivoted in relation to one another. For assembly, the clip with its open half-shells 58 and 59 is placed around the axis 18, the web 56 being inserted into the recess 57 when the half-shell 58 containing it is applied. After the clip is closed, the sleeve 16 is pushed over the clip or the half-shells 58 and 59 and thereby keeps the clip closed. The clip is preferably made of plastic and contains the sliding surfaces supporting the bushing 16 on its outer circumference. The two half-shells 58 and 59 of the clip can also be made as separate unconnected parts ( 17 ). The half-shells 58 and 59 of the clip are placed against one another during assembly on the axle 18 and are then held closed by the bushing 16 pushed over them.

Alternatively, the bush bearing 37 can be formed as a plastic encapsulation of the axle 18 . The web 56 can be resilient and can engage in the recess 57 when the bushing 16 is pushed over.

In another embodiment ( 12 ) the axle 18 is also in one piece. In modification of the embodiment of 10 the locking pin 55 passes through the axis 18 outside of the bush bearing 37. The bush bearing 37 is supported axially on the locking pin 55 with its end face 61 facing the section of the axis 18 surrounded by the torsion spring 22. The bush bearing 37 can be rotatable on the axle 18 . The bushing 16 is also rotatably slidably mounted on the bushing bearing 37 here.

Finally, according to a further embodiment, the bush bearing 37 can be omitted. The bushing 16 itself is rotatably arranged on the axle 18 (not shown) and is supported axially against the locking pin 55 .

The bush bearing 37 of 13 contains as a modification of the bush bearing 12 on its inner circumference, two bearing points 62 which project inwards in an annular manner and are axially spaced from one another. The bearing friction can be reduced due to the smaller bearing surface. In addition, a noise reduction can be achieved with this bearing. The bush bearing 37 is axially supported by the locking pin 55.

In the embodiment of 14 the axle 18 also has a casing 43 in the area of the bush bearing 37 or over its entire length. The radially protruding bearing points are embedded in the casing, in particular a plastic casing. This allows the sliding properties to be optimized.

The bush bearing 37 of 15 is designed as a plastic encapsulation of the axis 18. The bush bearing 37 is firmly connected to the axle 18 by the overmoulding. A locking pin or the like or an additional positive connection is not required.

18 shows an embodiment of the left-hand shaft bearing 9 with the adjusting device for the spring support part 26. The shaft bearing 9 has an extended bearing bushing 63 on which the shaft bearing bushing 30 is rotatably mounted. The spring adjustment shaft 27 is rotatably mounted in the bearing bush 63 . The pinion 28 is outside of the side Bearing wall 29 firmly connected to the spring adjustment shaft 27. The spring support part 26 is firmly attached to the inside of the bearing bushing 63 on the spring adjustment shaft 27 and forms an axial stop on the inner end face 64 of the bearing bushing 63. The bearing bushing 63 contains at its inner end a bearing pin 65 which extends into the open tube end of the axle 18 and supports the axis 18 radially as a plain bearing.

The central axis 18 is therefore arranged in a rotationally fixed manner only on the opposite shaft bearing 10 via the bearing journal 32, while it is supported at this end by the spring adjustment shaft 27 without being fixed in a rotationally fixed manner.

The pinion 28 is in adjustment engagement with the drive cable 14 on its circumference, in particular on its upper side. The drive cable 14 of the two drive cables 14, which are in particular ascending cables, which is guided in its course from the drive motor 15 to the guide rail 7 on which the Shaft bearing 9 is arranged is on the pinion 28 in adjustment engagement, so that the coupling of the drive cable 14 to the pinion 28 assigns the pull bow 5 connected to the drive cable 14 to the rotational position of the spring support part 26 . An adjustment device for adjusting the spring support part 26 thus includes not only the pinion 28 and the spring adjustment shaft 27 but also the drive cable 14 that actuates the pinion 28.

The drive cable 14 is in adjustment engagement with the pinion 28 at an upper circumferential position of the pinion. The roller blind 4 runs from the top of the winding shaft 8 to the pull bow 5. A longitudinal adjustment of the pull bow 5 along the guide rails 7 causes the associated movement of the blind web 4 to rotate the winding shaft 8. Synchronously, the drive cable 14 rotates the pinion 28 and thus the Spring adjustment shaft 27 with the spring support part 26 in the same direction of rotation. The winding radius of the roller blind 4 on the winding shaft 8 varies with the extended length of the roller blind 4 and thus with the layers of the roller blind 4 wound onto the winding shaft 8. The pinion 28 preferably has a radius which is approximately the winding radius of the roller blind 4 on the Winding shaft 8 corresponds to half the extension length of the roller blind 4.

The roller blind device 3 is mounted in such a way that the spring support part 26 is twisted relative to the winding shaft 8 in the tensioning direction of the torsion spring 22 to such an extent that the prestressing of the torsion spring 22 that is set as a result keeps the roller blind 4 under sufficient tension. With synchronous rotation of the winding shaft 8 and the spring support part 26, the winding shaft 8 remains under essentially the same spring preload relative to the spring support part 26. A slight increase and decrease in the spring preload results from the varying winding radius of the roller blind 4 of the winding shaft 8 can be unwound to a large extension length without an excessive spring preload or compression of the torsion spring 22 occurring due to the otherwise increasing spring torsion.

Furthermore, a gear can be provided on the shaft bearing 10, the z. B. is arranged on the outside of the bearing wall 29 and includes a drive pinion and a driven pinion, which are rotatably mounted on a common shaft. The drive cable 14 is in adjustment engagement on the drive pinion and the output pinion meshes with the pinion 28 which is non-rotatably connected to the spring adjustment shaft 27 . The gear ratio can e.g. B. be designed according to the extension length of the roller blind 4 or other parameters.

• - Längenausgleich nur außen an den beiden Wellenlagerbuchsen 30 und 31, an denen die Wickelwellenrohre 11 und 12 drehfest, aber axial verschiebbar gelagert sind,
• - Längenausgleich nur innen an den Aufsteckaufnahmen 44 und 45 der Buchse 16, außen feste Anbindung der Wellenlagerbuchsen 30 und 31 an die Wickelwellenrohre 11 und 12, diese Ausführungsform kann vorteilhaft sein, um Faltenbildung durch den Rollostoff 4 zu vermeiden,
• - Längenausgleich an den vier Stellen, d. h. an den beiden äußeren Wellenlagerbuchsen 30 und 31 und an den Aufsteckaufnahmen 44 und 45 der zentral angeordneten Buchse 16, so dass die Längen der Ausgleichsbereiche jeweils kürzer ausfallen können, diese Ausführungsform kann ebenfalls bezüglich Faltenbildung der Rollobahn 4 vorteilhaft sein.

There are therefore several options for length compensation of the winding shaft tubes 11 and 12:

• - Length compensation only on the outside of the two shaft bearing bushes 30 and 31, on which the winding shaft tubes 11 and 12 are mounted in a rotationally fixed but axially displaceable manner,
• - Length compensation only on the inside on the sockets 44 and 45 of the bush 16, on the outside firm connection of the shaft bearing bushes 30 and 31 to the winding shaft tubes 11 and 12, this embodiment can be advantageous in order to avoid the formation of wrinkles through the blind fabric 4,
• - Length compensation at the four points, i.e. at the two outer shaft bearing bushes 30 and 31 and at the sockets 44 and 45 of the centrally arranged bush 16, so that the lengths of the compensation areas can be shorter in each case. This embodiment can also be advantageous with regard to the formation of folds in the roller blind 4 be.

The roller blind device according to the invention thus offers cost savings by shortening the torsion spring 22 and the sheathing or plastic coating of the axle 18, especially with a curved axle 18 ("curved shaft") or with an assembled axle with curved axle parts 19 and 20 with a torsion spring 22 that can be adjusted by the adjustment device .

Due to the symmetrical loading of the two winding shaft tubes 11 and 12, an angular offset of the two winding shaft tubes 11 and 12 or a sole continuous winding shaft is avoided. By halving the moment load on the two winding shaft tubes 11 and 12, there is less torsion of the two winding shaft tubes 11 and 12.

This achieves a uniform winding of the roller blind fabric 4, with the formation of folds due to the angular offset of the two winding shaft tubes 11 and 12 being avoided, in particular with a curved axis 18 ("curved shaft") with an adjustable torsion spring 22.

Reference List

1

vehicle roof

2

roof section

3

blind device

4

roller blind

5

drawbar

6

End

7

guide rail

8th

winding shaft

9

shaft bearing

10

shaft bearing

11

winding shaft tube

12

winding shaft tube

13

cable routing

14

drive cable

15

drive motor

16

Rifle

17

opening

18

axis

19

axle part

20

axle part

21

fastener

22

torsion spring

23

cylindrical space

24

fixation point

25

hook end

26

spring support part

27

spring adjustment shaft

28

pinion

29

storage wall

30

shaft bearing bush

31

shaft bearing bush

32

bearing journal

33

cones

34

cones

35

web

36

groove

37

bush bearing

38

Federation

39

support surface

40

face

41

plain bearing section

42

plain bearing section

43

sheathing

44

snap-on mount

45

snap-on mount

46

Nose

47

longitudinal recess

48

support area

49

support part

50

opening

51

outer perimeter

52

opening

53

through hole

54

axle bore

55

locking pin

56

web

57

recess

58

half shell

59

half shell

60

swivel range

61

face

62

storage place

63

bearing bush

64

face

65

bearing journal

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited 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 102018117156 A1 [0002]

Claims (15)

Roller blind device (3) for a vehicle with a roller blind (4) which is wound up on a winding shaft (8) which is rotatably mounted by means of two shaft bearings (9, 10) and prestressed in the winding direction by means of a torsion spring (22), the winding shaft (8) is formed by two winding shaft tubes (11, 12) through which a central non-rotating axis (18) passes and which are connected to one another in a rotationally fixed manner by means of a bushing (16), and wherein each winding shaft tube (11, 12) is attached to the associated shaft bearing (9th , 10) is rotatably mounted and the bush (16) is rotatably mounted on the axle (18), characterized in that the torsion spring (22) is arranged inside one of the winding shaft tubes (11, 12) and surrounds the axle (18) and on the one hand on the bushing (16) and on the other hand on a spring support part (26) in the region of the shaft bearing (9) of the winding shaft tube (11) surrounding the torsion spring (22). Roller blind device (3) after claim 1 , characterized in that the bushing (16) is rotatably mounted on a bushing bearing (37) and the bushing bearing (37) - either fixedly attached to the continuous one-piece axle (18) - or represents a connecting element (21), the axle (18) is formed in two parts in the longitudinal direction and the connecting element (21) connects the two axle parts (19, 20) to one another. Roller blind device (3) after claim 2 , characterized in that the bush (16) is supported axially on the bush bearing (37) against the tensile force of the torsion spring (22). Roller blind device (3) after claim 2 or 3 , characterized in that the bush bearing (37) is fixed to the axle (18) by means of a positive locking element (56) or by means of a locking pin (55). Roller blind device (3) according to one of claims 2 until 4 , characterized in that the bush bearing (37) is formed by two half-shells (58, 59) which are held in the bush (16) as a unit on the axle (18). Roller blind device (3) according to one of claims 2 until 5 , characterized in that the bush bearing (37) is an injection-molded part that can be attached to the axle (18) or is formed as an overmolding around the axle (18). Roller blind device (3) according to one of Claims 1 until 6 , characterized in that a casing (43) or an injection molding is attached to the region of the axle (18) or axle part (19) surrounded by the torsion spring (22). Roller blind device (3) according to one of Claims 1 until 7 , characterized in that the bushing (16) has two push-on mounts (44, 45) for the two winding shaft tubes (11, 12) on its circumference and the winding shaft tubes (11, 12) on the push-on mounts (44 or 45) in particular by means of a positive fit are rotatably and axially movable. Roller blind device (3) according to one of Claims 1 until 8th , characterized in that the axle (18) or the two axle parts (19, 20) is or are bent and that the two winding shaft tubes (11, 12) are formed so elastically that they also rotate on the of the Adjust the axle (18) or the bend specified by the two axle parts (19, 20). Roller blind device (3) according to one of Claims 1 until 9 , characterized in that the torsion spring (22) is fastened to the spring support part (26) which is rotatably mounted between the winding shaft (8) and a spring support part (26), which is in particular coaxial with the winding shaft (8), and that an adjustment device controls the spring support part (26) for setting a length adapted to the extension the roller blind (4) adjusted spring preload adjusted relative to the winding shaft (8). Roller blind device (3) after claim 10 , characterized in that the adjusting device rotates the spring support part (26) in the direction of rotation of the winding shaft (8) in order to maintain a spring pretension set when the roller blind (4) is wound up when the roller blind (4) is unwound. Roller blind device (3) after claim 10 or 11 , characterized in that the adjusting device - an electric motor which drives the spring support part (26) or forms or contains the spring support part (26), or - a drivable drive wheel or pinion (28) which is arranged coaxially with the spring support part (26) and with it is rotatably connected, has. Roller blind device (3) after claim 12 , characterized in that a pulling bow (5) is connected to an extension end of the roller blind (4), is slidably mounted on both sides on a guide rail (7) and for winding and unwinding the roller blind (4) onto or from the winding shaft (8) can be adjusted along the guide rails (7), in particular by means of a drive device, the pinion (28) being in adjustment engagement with a drive cable (14) which has is connected to the pull bow (5) and can be adjusted in particular by a drive motor (15). Roller blind device (3) after claim 12 or 13 , characterized in that the spring support part (26) or the pinion (28) is coupled to the drive cable (14) via a gear mechanism and can be rotationally adjusted by the latter. Roller blind device (3) according to one of Claims 1 until 14 , characterized in that one shaft bearing (10) has a bearing journal (32) which rotatably supports a shaft bearing bushing (31) of the associated winding shaft tube (12) and on which the central axis (18) is non-rotatably attached at one end, and that the other shaft bearing (9) rotatably supports the spring support part (26) or a spring adjustment shaft (27) carrying the spring support part (26) relative to the fixed central axis (18) and to the associated other winding shaft tube (11).

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