Windshield wiper device and vehicle equipped with such a device

Abstract

Title: Windscreen wiper device and vehicle equipped with such a device Vehicle windscreen wiper device (10) comprising a wiper blade (12) with a wiping lip (14), a wiper drive for moving the wiper blade (12) over a vehicle window (20) or sensor surface (22) and at least one wiper arm for connecting the wiper blade (12) to the wiper drive, the wiper device characterized by a suction unit (24) having a suction recess (26) for at least partially sucking liquid from the vehicle window (20) or sensor surface (22). Figure 3

Description

Title of the invention: Windshield wiper device and vehicle equipped with such a device FIELD OF THE INVENTION

[0001] The present invention relates to a vehicle windshield wiper device comprising a wiper blade with a wiping lip, a wiper drive for driving the wiper blade over a vehicle window or a sensor surface and a wiper arm connecting the wiper blade to the wiper drive. STATE OF THE ART

[0002] Such a windshield wiper device is already known.

[0003] DISCLOSURE AND ADVANTAGES OF THE INVENTION

[0004] The present invention aims to overcome the disadvantages of the known solutions and for this purpose relates to a vehicle windscreen wiper device comprising a wiper blade with a wiping lip, a wiper drive for moving the wiper blade over a vehicle window or sensor surface and at least one wiper arm for connecting the wiper blade to the wiper drive, which wiper device is characterized by a suction unit having a suction recess for at least partially sucking liquid from the vehicle window or sensor surface.

[0005] The windscreen wiper device according to the invention has a very high cleaning capacity because, in particular, the suction of the liquid leaves practically no residual water on the window, which is thus cleaned in a particularly effective manner. This has the advantage of very high safety and high user comfort because the suction of the liquid leaves practically no residual water on the window and thus guarantees particularly good visibility for the driver. The operation is economical because, by suctioning the liquid, it can be reused or the consumption of liquid (water or windscreen washer fluid) can be reduced thanks to this recovery of the liquid.

[0006] Preferably, the wiping device is a window wiping device or a sensor or similar function. The windshield wiper device is applied to a vehicle, in particular a passenger vehicle or a truck. The vehicle may also be a boat or an airplane or a locomotive or a comparable vehicle or more generally a means of transport. The windshield wiper device forms at least a part of the wiping means, in particular the windshield wiper. The device wiper is intended for cleaning a surface such as a vehicle window or a sensor or projector surface.

[0007] The wiper device is intended to wipe a vehicle window such as the windshield or the rear window or the surface of a sensor by being coupled to the wiper drive of the vehicle.

[0008] The wiper drive enables the wiper blade to be moved over the vehicle window or the sensor surface. The wiper blade has a lip which, in operation, is in contact with the vehicle window or the sensor surface. The wiper blade is coupled to the wiper arm of the wiping device. The wiper blade has an adapter for mechanically coupling the wiper blade to the wiper arm, in particular the wiper arm adapter. The term "install" or "intended for" means that it is a means specially designed or equipped to perform a certain function. The fact that an object performs a certain function means that the object performs this function in at least one application or operating state.

[0009] The wiper blade suction unit is provided on the wiper blade deflector or a wiper blade end cap or the wiper blade adapter or any other component of the wiper blade. The suction unit has a fluid conducting element for conducting the liquid which is water, windshield washer fluid or rainwater. The suction unit has a suction element with a suction recess. The fluid conducting element is used to create a vacuum to suck the liquid through the suction recess.

[0010] The suction recess has a suction opening which is partially or completely delimited by the suction element or is surrounded by it. The suction opening of the suction recess is in the area close to the window pane. The area close to the suction opening is constituted by all points which are at a distance from the suction opening which is less than 10 mm, preferably 5 mm, and even more preferably 1 mm.

[0011] The suction recess or suction opening is formed at least in part by the vehicle window or the sensor surface. The suction element is at least in part in contact with the window. The suction recess allows liquid such as washing water, windshield washer fluid or rainwater or the surrounding air to be permanently removed from the window. The suction unit continuously sucks in the liquid during the wiping operation. Alternatively, the suction unit can also suck in the liquid only in the storage area or the reversing area of ​​the wiper blade or only during a wiping movement. The term "depression" means that it is a pressure which is lower than the ambient pressure such as atmospheric pressure.

[0012] The windshield wiper device comprises a pump for generating air pressure, preferably pressure or vacuum relative to ambient pressure. The air pressure is used to move the liquid in the fluid line element. It is also possible to envisage that the windshield wiper device is connected pneumatically to a pressure accumulator by a fluid connection via the pump or the fluid line element. Alternatively, the wiping device may also comprise a water or windshield washer fluid pump for supplying the washing water or windshield washer fluid under pressure. It is also possible to envisage that the suction unit can be retrofitted to an existing compressed air network of the vehicle.

[0013] According to another feature, the suction recess is integrated into the wiping lip or is formed at least partially by the wiping lip. This has the advantage of reduced complexity since additional components such as the suction element or fastening elements are superfluous. The wiping lip has several suction recesses distributed over the length of the wiper blade. In particular, the wiping lip has more than six suction recesses. The wiping lip has a suction channel connected by a fluid connection to a suction recess. The suction channel is formed by the wiping lip. Alternatively, the suction channel can also be formed by a suction pipe. The suction channel allows the liquid to be discharged. The suction channel is connected by a fluid connection to the pump which provides a vacuum to suck the liquid through the suction recess and through the suction channel.

[0014] According to another feature, the wiper blade has at least one scraper lip in continuous contact with the vehicle window along the entire length of the wiping lip. This provides a high cleaning capacity because the scraper lip in continuous contact scrapes the liquid along the entire length of the wiping lip and leaves no liquid residue or streaks. The scraper lip is in contact with the vehicle window or the sensor surface along its entire length or along the entire length of the wiping lip. The scraper lip scrapes the liquid from the window. The scraper lip does not have a suction recess. The length of the wiping lip is at least practically equal to that of the scraper lip. The scraper lip is spaced from the wiping lip and is practically parallel to it.

[0015] The wiping lip and the wiper lip are connected by a connecting element which positions the wiping lip and the wiper lip relative to each other. The wiping lip or the wiper lip are connected to each other by a connecting element which provides a form-fitting connection. Alternatively, the wiping lip or the wiper lip may be made in one piece with the connecting element, for example, by vulcanization. The connecting element is made of a form-stable material. such as a metal or a plastic material or a composite material or a comparable material. The expression "at least practically" means in the present context that the deviation from a predefined value is in particular less than 25%, preferably less than 10% and particularly preferably less than 5% of the predetermined value.

[0016] According to another characteristic, the wiper blade has at least one other wiping lip located on the opposite side relative to the wiper lip. This will provide a very high cleaning capacity because the other wiping lip which is on the opposite side relative to the wiper lip thus allows the liquid to be sucked up in both directions of movement.

[0017] The other wiping lip comprises further suction recesses. This other wiping lip is identical to the wiping lip. Alternatively, the other wiping lip may have a geometry symmetrical to that of the first wiping lip with respect to the wiper lip. The other wiping lip is spaced from the wiper lip. This other wiping lip is connected to the connecting element by a form-fitting or material connection. The wiping lip and the other wiping lip are in contact with the window, in particular, at least in an adjustment mode. The wiping lip and the other wiping lip may be without contact with the window. For example, they may, in particular, in adjustment mode, have a distance, preferably, less than 5 mm, in particular, preferably, less than 1 mm from the window. The wiping lip and the other wiping lip as well as the wiper lip are made of the same material.It is also possible to envisage that the wiping lip, in particular without contact with the window and / or the other wiping lip, is made of a shape-stable material, for example, plastic, in particular a thermoplastic material.

[0018] The wiper lip forms, with the wiping lip or with the other wiping lip, a suction reservoir which, in at least one operating state, is under vacuum. This allows for a high cleaning capacity because the liquid between the wiping lip and the other wiping lip will be sucked in. The wiper lip forms, with the wiper lift, a suction reservoir. The wiper lip forms, with the other wiping lip, another suction reservoir. The suction reservoir can be under vacuum or pressure independently of the other suction reservoir.

[0019] Alternatively, it is possible to envisage connecting, by a fluid connection, the suction tank and the other suction tank and that it has at least in one operating state, practically the same depression. The suction tank is delimited by the connecting element. The connecting element has one, and preferably, several suction connections for sucking the liquid from the suction tank. The The suction tank is connected to the liquid tank (wash water or windshield washer fluid) by the suction connections.

[0020] According to another feature, the wiper blade has a spray unit with at least one nozzle element for applying a liquid to the vehicle window or the sensor surface. This provides a high cleaning capacity because, in particular, for very stubborn dirt, liquid is applied to the window. The nozzle element is designed to at least partially wet the vehicle window or the sensor surface. The spray unit is provided on the wiper blade, for example, the wiper blade deflector or a wiper blade end cap or the wiper blade adapter or another component of the wiper blade. The spray unit has a fluid-conducting element for the liquid, which is washing water, windshield washer fluid or rainwater. The nozzle element has an orifice for distributing the liquid onto the window.

[0021] According to another feature, the nozzle element is formed by a suction recess. The advantage is reduced assembly complexity because, in particular, the nozzle element is formed by the suction recess. Very high safety and comfort are achieved because, in particular, the liquid remains largely between the wiper lip and the wiping lip or the other wiping lip and the liquid is thus practically not perceived by the driver. The suction reservoir allows the liquid to be received, either by vacuum through a suction recess or by forming at least one suction recess, by applying an overpressure to the liquid through the nozzle element.

[0022] According to another characteristic, the suction unit comprises a set of suction recesses distributed along the longitudinal direction of the wiper blade with a gap or interval of less than 5 cm. This has the advantage of construction properties because advantageous construction properties are thus available because the suction is uniform over the entire length of the wiping lip. In particular, the suction recesses have a gap of less than 10 cm, preferably less than 5 cm. In particular, the suction recesses have a gap of at least 0.5 cm, preferably at least 1 cm. The wiping lip or the other wiping lip has in particular at least 3, at least 6 and particularly preferably at least 10 suction recesses. The other wiping lip has the same number of suction recesses as the first wiping lip.The suction recesses of the wiper lip are offset relative to the suction recesses of the other wiper lip. The longitudinal direction of the wiper blade is at least substantially parallel to the main direction of extension of the wiper blade and / or the wiper lip. The term "main direction . "extension" of an object is notably the direction parallel to the longest edge of the smallest geometric parallelepiped which closely and completely surrounds the object.

[0023] According to another feature, the gaps or intervals between two adjacent suction recesses in the longitudinal direction of the wiper blade decrease from the inner end to the outer end of the wiper blade. This provides a particularly high suction capacity because the particularly high quantity of liquid at the outer end of the wiper blade will be guaranteed to be sucked in due to the circulating wind. For example, the closer the liquid is to the outer end of the wiper blade, the more liquid can be sucked in.For example, due to the effect of the circulating wind or the centrifugal force induced by the wiping movement, the liquid moves towards the outer end of the wiper blade as in operation at the outer end of the wiper blade, it is foreseeable to have more liquid than at the inner end of the wiper blade, the distance between two suction recesses at the outer end of the wiper blade will be less than the distance at the inner end of the wiper blade. The distance decreases linearly depending on the length of the wiper blade. Alternatively, it is also possible to have a variation of the distance which is not linear, but, for example, exponential or a comparable variation which is technically interesting. The term "outer end of the wiper blade" refers to the point on the wiper blade which is furthest from the wiper drive.The term "inner wiper blade end" refers in particular to the point on the wiper blade closest to the wiper drive. In particular, the speed of the wiper at the inner end of the wiper blade is less than or equal to the speed at the outer end of the wiper.

[0024] According to another feature, the opening surfaces of the suction recesses in the longitudinal direction of the wiper blade increase from the inner end to the outer end of the wiper blade. A particularly high suction capacity is achieved because, also due to the circulating wind, the largest amount of liquid at the outer end of the wiper blade will be safely sucked in. Preferably, the suction recesses have different surfaces. The suction recess which is at the shortest distance from the inner end of the wiper blade has the smallest opening surface of the suction recesses of the wiping lip or the other wiping lip.The suction recess which is at the shortest distance from the outer edge of the wiper blade has the largest opening area among the suction openings of the wiper lip or the other wiper lip.

[0025] Two neighboring suction recesses have a different opening surface. Preferably, the suction recess of two neighboring suction recesses which are, in the longitudinal direction of the wiper blade, closer to the outer end of the wiper blade will have a larger opening surface than the other two neighboring suction recesses. Each other suction surface, in particular at the inner end of the wiper blade relative to the outer end of the wiper blade, varies linearly. The longitudinal extension of the opening surface is greater the closer it is to the opening surface of the outer end of the wiper blade. In particular, the longitudinal extension of the opening surface is at least substantially parallel to the main direction of extension of the wiping lip and / or the other wiping lip.The opening surface along the longitudinal direction of the wiper blade perpendicular to the longitudinal direction of the wiper blade is at least substantially the same. Alternatively, the opening surfaces perpendicular to the longitudinal direction of the wiper blade could also have a variable length which is in particular all the greater the closer the opening surface is to the outer end of the wiper blade.

[0026] The invention also relates to a vehicle equipped with a wiping device which offers high safety and comfort of use because, in particular, thanks to the suction of the liquid, there is no residual water left on the window so that the driver will have particularly good visibility. Advantageously, the distance that the vehicle can travel is particularly high because the windshield washer fluid or rainwater will be sucked from the window for re-use. The wiping device has a control or regulation unit. This control or regulation unit is the control apparatus of the vehicle. The term "control or regulation unit" designates a unit having at least one control electronics. The term "control electronics" designates in particular a unit with a processor and a memory as well as an operating program stored in the memory.

[0027] According to another feature, in at least one step of the method, the liquid is sucked from the window by the wiping device. This provides a high cleaning capacity because the suction of the liquid leaves no residual water on the window, which is thus cleaned in a particularly effective manner. The pump generates a vacuum and the liquid on the vehicle window or the sensor surface will be sucked through the suction recesses. The liquid is sucked into the reservoir through the suction recesses. The liquid from the suction reservoir will be sucked into the windshield washer fluid reservoir via the pipe.

[0028] The wiping device according to the invention, the vehicle according to the invention and the method according to the invention are not limited to the applications and embodiments described above. Brief description of the drawings

[0029] The present invention will be described below in more detail with the aid of an embodiment of a vehicle window wiping device or sensor surfaces shown in the accompanying drawings in which,

[0030] Thus:

[0031] [Fig-1] diagram of a vehicle equipped with a wiping device,

[0032] [Fig.2] schematic sectional view of the windshield wiper device with a wiper lip,

[0033] [Fig.3] schematic perspective view of the wiping device, and

[0034] [Fig.4] very schematic flowchart of a device management process wiping.

[0035] DESCRIPTION OF THE EMBODIMENT OF THE INVENTION

[0036] [Fig.l] shows a vehicle 10 which is a motor vehicle 10, but which could also be a utility vehicle, a train, an airplane, a boat or a comparable vehicle. The vehicle 10 has a window which is a vehicle window 20 such as the windshield. The vehicle window 20 may also be the rear window or a comparable window. Alternatively or additionally, the window 20 may also be the surface 22 of a sensor. The vehicle 10 is equipped with a wiping device. The wiping device has a wiper arm 16. The wiping device or wiper device has a wiper drive 18. The wiper arm 16 is attached to the wiper drive 18. The wiper device has a wiper blade 12. The wiper drive 18 moves the wiper blade 12 across the window.

[0037] The wiper blade 12 is attached to the wiper arm 16 via a wiper blade adapter. The wiper arm 16 connects the wiper blade 12 to the wiper drive 18. The wiper blade 12 moves over the vehicle window 20 or over the sensor surface 22. The wiper blade 12 has an outer wiper blade end 46. The outer end 46 is at the point of the wiper blade 12 furthest from the wiper drive 18. The wiper blade 12 has an inner end 44. This inner end 44 is designed as a point of the wiper blade 12 closest to the wiper drive 18. The vehicle 10 has a control or regulating unit 50. This control or regulating unit 50 is the control device of the vehicle 10.

[0038] [Fig. 2] is a schematic sectional view of the wiper blade 12 of the wiper device. The wiper blade 12 has a wiper lip 28. The wiper blade window 12 has a wiping lip 14. The wiper lip 28 is in contact with the window 20 of the vehicle, continuously over the entire length 30 of the wiping lip 14 (see [Fig.3]). The wiper lip 28 is in contact with the window 20 of the vehicle, continuously over the entire length 30 of the wiper lip 28. The wiping lip 14 is parallel to the wiper lip 28. The wiper blade 12 has another wiping lip 32. This other wiping lip 32 is parallel to the wiper lip 28. The wiping lip 14 and the other wiping lip 32 are of the same construction. The wiping lip 14 has the same length as the wiper lip 28. The other wiping lip 32 is of the same length as the wiper lip 28. The other wiping lip 32 is installed at the opposite end of the wiping lip 32 with respect to the wiper lip 28. The wiping lip 14 and the wiper lip 28 are spaced apart from each other.The wiping lip 14 is in contact with the vehicle window 20.

[0039] The other wiping lip 32 is in contact with the vehicle window 20. This other wiping lip 14 and the wiper lip 28 are spaced apart from each other. The wiping lip 14 and the other wiping lip 32 as well as the wiper lip 28 are connected to each other by a force connection by a connecting element 52. Alternatively or additionally, the connecting element 52 can also be connected to the wiping lip 14 and to the other wiping lip 32 and to the wiper lip 28 by a form-fitting or material-fitting connection. For example, the wiping lip 14, the other wiping lip 32 and the wiper lip 28 may be vulcanized onto the connecting element 52.

[0040] The wiper device has a wiping movement direction. The wiping movement direction is that of the forward movement 60 and that of the return movement 62. The forward movement 60 and the return movement 62 are perpendicular to the longitudinal direction 40 of the wiper blade 12. The forward movement 60 is oriented away from the storage position 70 of the wiper blade 12. The return movement 62 is oriented toward the storage position 70 of the wiper blade 12 (see [Fig.2]).

[0041] [Fig. 3] is a schematic representation of the windshield wiper device of the vehicle 10. The windshield wiper device has a suction unit 24. This suction unit 24 has several suction recesses 26. The suction recesses 26 are formed by the wiping lip 14 and by the other wiping lip 32. The suction recesses 26 allow the liquid to be sucked from the window. The suction recesses 26 are distributed along the longitudinal direction 40 of the windshield wiper blade 12 at a distance 42 of less than 5 cm from each other. The gap or distance 42 between two neighboring suction recesses 26 decreases along the longitudinal direction 40 of the wiper blade 12 from the inner end 44 to the outer end 46 of the wiper blade. The distance 42 decreases linearly at from the inner end 44 of the wiper blade towards the outer end 46 of the wiper blade.

[0042] Alternatively, the gap 42 could also decrease exponentially or along a comparable path. The suction recesses 26 are denser in their arrangement the closer the recesses 26 are to the outer end 46 of the wiper blade. The suction recesses 26 each have an opening surface 48. The opening surface 48 of the suction recesses 26 along the longitudinal direction 40 of the wiper blade 12 crosses from the inner end 44 of the wiper blade 12 to the outer end 46 of the wiper blade. The suction recesses 26 passing through the wiping lip 14 have different opening surfaces 48. The suction openings 26 formed by the other wiping lip 32 have opening surfaces 48 of different sizes.The suction recess 26 of the wiper blade 14 has the shortest distance from the inner end 44 of the wiper blade which has the smallest opening area 48 among all the surfaces 48 of the suction recesses 26. The suction recess 26 of the other wiper blade 32 which has the shortest distance from the inner end 44 of the wiper blade has the smallest opening area 48 among the opening surfaces 48 of the suction recesses 26.

[0043] The suction recess 26 which has the shortest distance from the outer end 46 of the wiper blade has the largest opening surface 48 among the opening surfaces 48 of the suction recesses 26. The opening surfaces 48 have the same height along the longitudinal direction 40 of the wiper blade 12, perpendicular to this longitudinal direction 40 of the wiper blade 12. The opening surfaces 48 have the same height along the longitudinal extension direction 40 of the wiper blade 12 perpendicular to the window. Alternatively, the opening surfaces 48 of the suction recesses 26 may have different geometries. Two suction recesses 26 adjacent to the wiping lip 14 have different opening surfaces 48. Two neighboring suction recesses 26 of the other wiping lip 32 have opening surfaces 48 of different sizes.

[0044] The wiper lip 28 forms with the wiping lip 14 and with the other wiping lip 32 a suction reservoir 34. The wiper lip 28 forms with the wiping lip 14 a first suction reservoir 66. The first suction reservoir 66 is delimited by the connecting element 52 and the wiper lip 28 as well as the wiping lip 14. The wiper lip 28 forms with the other wiping lip 14 another suction reservoir 68. This other suction reservoir 68 is delimited by the connecting element 52 and the wiper lip 28 as well as the other wiping lip 32. The first suction reservoir 68 and the other suction reservoir 68 are connected by a fluid suction. The suction tank 34 is formed by the first suction tank 66 and the other suction tank 68. The first suction tank 66 could also be put under depression or pressure independently of the other suction tank 68.

[0045] The connecting element 52 has a suction connection 64 (see [Fig.2]). The suction connection 64 makes it possible to suck the liquid from the suction tank 34. It is also possible to envisage that the connecting element 52 comprises several suction connections 64. The suction unit 24 has a pump. This pump is connected by a fluid connection to the suction tank 34. The pump makes it possible to create a pressure in the suction tank 34 which is under vacuum.

[0046] The wiper blade 12 has a spray unit 36. This spray unit has nozzle elements 38. The nozzle elements 38 are used to apply a liquid to the vehicle window 20 and the sensor surface 22. The nozzle elements 38 are formed by the suction recesses 26. The nozzle elements 38 and the suction recesses 26 are in one piece.

[0047] The first wiping lip 14 and the other wiping lip 32 installed on either side of the wiper lip 28 make it possible to suck up the liquid during the forward movement 60 and the return movement 62 of the vehicle window 20. It is also possible to envisage that the windscreen wiper device only comprises the wiping lip 14 which will then make it possible to suck up the liquid only during the forward movement 60 or the return movement 62.

[0048] [Fig.4] is a very schematic flowchart of a method of operation of the windshield wiper device.

[0049] In the method step 54, the liquid is sucked from the window with the windscreen wiper device. The liquid is sucked during one direction of movement of the windscreen wiper blade 12 on the side of the windscreen wiper blade 12 in front of the wiper lip 28. The liquid is sucked into the suction reservoir 34 through the suction recesses 26. The pump creates a vacuum in the suction reservoir 34. Thus, the liquid is sucked via the liquid line from the suction reservoir 34.

[0050] In a further method step 56 the sucked liquid is collected in a water tank. It is also possible to consider collecting the sucked liquid in an additional tank. The sucked liquid will be filtered and, alternatively or additionally, the liquid could also be discharged to the outside.

[0051] In a further method step 58 the pump creates pressure. The sucked liquid and / or the washing water or windshield washer fluid will be pumped into the suction tank 34. The liquid is then applied to the vehicle window 20 by the nozzle elements 38. The liquid is driven by the vacuum through the nozzle elements 38 of the suction tank 34.

[0052] NOMENCLATURE OF MAIN ELEMENTS

[0053] 10 Vehicle

[0054] 12 Windshield wiper blade

[0055] 14 Wiper lip

[0056] 16 Windshield wiper arm

[0057] 18 Windshield wiper drive

[0058] 20 Vehicle glass

[0059] 22 Sensor surface

[0060] 24 Suction unit

[0061] 26 Suction recess

[0062] 28 Lip-squeegee

[0063] 30 Length of the scraper lip

[0064] 32 Other wiping lip

[0065] 34 Suction tank

[0066] 36 Spray unit

[0067] 38 Nozzle element

[0068] 40 Longitudinal direction

[0069] 42 Gap

[0070] 44 Inner end of wiper blade

[0071] 46 Outer end of wiper blade

[0072] 48 Opening surface

[0073] 52 Connecting element

[0074] 54 Process step

[0075] 60 Forward movement

[0076] 62 Return movement

[0077] 64 Suction connection

[0078] 66 Suction tank

[0079] 68 Other suction tank

Claims

Claims

1. Vehicle windscreen wiper device (10) comprising a wiper blade (12) with a wiping lip (14), a wiper drive (18) for moving the wiper blade (12) over a vehicle window (20) or sensor surface (22) and at least one wiper arm (16) for connecting the wiper blade (12) to the wiper drive (18), which wiper device is characterized by a suction unit (24) having a suction recess (26) for at least partially sucking liquid from the vehicle window (20) or sensor surface (22).

2. Windscreen wiper device according to claim 1, characterized in that the suction recess (26) is integrated in the wiping lip (14) or is formed at least partly in the wiping lip (14).

3. Windscreen wiper device according to claim 1 or 2, characterized in that the wiper blade (12) has at least one wiper lip (28) which is permanently in contact with the vehicle window (20) or the sensor surface (22) substantially over the entire length (30) of the wiper lip (28).

4. Windscreen wiper device according to claim 3, characterized in that the wiper blade (12) has at least one further wiping lip (32) which is on the opposite side to that of the wiping lip (14) with respect to the wiper lip (28).

5. Windscreen wiper device according to one of the preceding claims, characterized in that the wiper lip (28) forms with the wiping lip (14) or with the other wiping lip (32) a suction reservoir (34) under vacuum.

6. Windscreen wiper device according to one of the preceding claims, characterized in that the wiper blade (12) has a spray unit (36) with at least one nozzle element (38) for applying liquid to the vehicle window (20) or the sensor surface (22).

7. Windshield wiper device according to one of the preceding claims, characterized in that the nozzle element (38) is formed by a suction recess (26).

8. Windscreen wiper device according to one of the preceding claims, characterized in that the suction unit (24) has several suction recesses (26) distributed along the longitudinal direction (40) of the wiper blade (12) with a spacing (42) of at least 5 cm.

9. Windscreen wiper device according to one of the preceding claims, characterized in that the distances (42) between two suction recesses (26), adjacent in the longitudinal direction (40) of the wiper blade (12) decrease from the inner end (44) of the wiper blade towards the outer end (46) of the wiper blade.

10. Windscreen wiper device according to one of claims 7 to 9, characterized in that the opening surfaces (48) of the suction recesses (26) are crescent-shaped in the longitudinal direction (40) of the wiper blade (12) from the inner end (44) to the outer end (46) of the wiper blade.

11. Vehicle (10) equipped with a windshield wiper device according to one of the preceding claims.

12. Method for operating the windscreen wiper device according to one of claims 1 to 10, characterized in that in a method step (54) the liquid is sucked from the vehicle window (20) or from the sensor surface (22) by the wiping device.

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