wiper arm, wiper mechanism and motor vehicle

Abstract

The invention relates to a wiper arm (6) for holding a wiper blade (4) of a wiping device (3) of a motor vehicle (1), wherein the wiper arm (6) has a one-piece manufactured carbon body (7), a wiper blade holder (8) formed on the carbon body (7) for fixing the wiper blade (4) to the carbon body (7) and a wiper arm holder (9) formed on the carbon body (7) for fixing the wiper arm (6) to a wiper drive (5) of the wiping device (3). Improved functionality at low weight can be achieved by having a spoiler (17) formed on the carbon body (7) and by having a maintenance opening (18) on the carbon body (7) through which a spring (16) of the wiper mechanism (3) is accessible.

Description

[0001] The present invention relates to a wiping unit for holding a wiper blade of a wiping device of a motor vehicle, according to the preamble of claim 1. The invention further relates to a wiping device equipped with such a wiping arm. The invention also relates to a motor vehicle equipped with such a wiping device.

[0002] A conventional wiping unit is known from DE 10 2019 208 809 A1 and comprises a wiper arm, a wiper foot, and a joint connecting the wiper arm to the wiper foot. The joint has a wiper arm joint section and a wiper foot joint section articulated thereto. The wiper arm has a wiper arm body on which the wiper arm joint section is formed, and a wiper blade holder formed on the wiper arm body for securing the wiper blade to the wiper arm body. The wiper foot has a wiper foot body on which the wiper foot joint section is formed, and a drive bracket for securing the wiping unit to a wiper drive of the wiping device. In the known wiping unit, a maintenance opening is formed on the wiper foot body through which lines for supplying a cleaning fluid are accessible.

[0003] A wiper unit of this type is known from DE 10 2019 219 627 A1 and is distinguished from the aforementioned conventional wiper unit in that the joint has a spring for holding the wiper arm and the wiper foot in a working state of the wiper unit, wherein, in the installed state of the wiper unit on the motor vehicle, the wiper blade rests on a window of the motor vehicle.

[0004] From DE 10 2018 219 117 A1 a wiper arm is known which has a one-piece manufactured carbon body.

[0005] Other wiper arms with a carbon body are known from CN 212 073 966 U and from CN 211 252 527 U.

[0006] From DE 10 2014 226 401 A1 a wiper blade is known which has a stabilizing body made of carbon.

[0007] A wiper arm with a spoiler is known from WO 2010 / 009922 A1.

[0008] Wiper blades with a spoiler are known from US 2016 / 0 375 867 A1 and US 2012 / 0 030 894 A1.

[0009] A wiper arm with an integrally formed spoiler is known from DE 100 06 850 A1.

[0010] The subsequently published DE 10 2024 117 365 B3 reveals a carbon wiper arm with integrated spoiler and integrated maintenance opening.

[0011] The present invention addresses the problem of providing an improved or at least a different embodiment for a wiping unit of the type described above, or for a wiping device equipped therewith, or for a motor vehicle equipped therewith, which is characterized in particular by high functionality at low weight.

[0012] This problem is solved according to the invention by the subject matter of the independent claim. Advantageous embodiments are the subject matter of the dependent claims.

[0013] The invention is based on the general concept of manufacturing the wiper arm body and the wiper foot body from carbon fiber and integrating a maintenance opening into the wiper arm body, thereby giving the wiper arm an additional function. This additional function can already be taken into account during the manufacturing of the one-piece carbon fiber bodies of the wiper arm and the wiper foot, thus eliminating any additional assembly effort for integrating this additional function. In this context, "carbon fiber" refers to a composite material, i.e., a composite material or a composite material, which typically comprises a polymer matrix and embedded carbon fibers.

[0014] In detail, it is proposed according to the invention that the wiper arm body and the wiper foot body are each made of carbon in one piece, that the joint has a spring for holding the wiper arm and the wiper foot in a working state of the wiping unit, and that the wiper arm body has a maintenance opening through which the spring of the joint is accessible.

[0015] When installed on a motor vehicle, the wiper arm and wiper blade rest on a window of the vehicle, preferably a windshield. According to an advantageous embodiment, the wiper arm body can have a top surface facing away from the window, with the maintenance opening located on this top surface. This makes the maintenance opening easily accessible for servicing purposes.

[0016] Since the joint spring can hold the wiper arm and wiper foot in the working position, this position is stable relative to the wiper arm and wiper foot. In the working position, the joint spring can be configured, in particular, to generate a preload to press the wiper blade against the windshield being wiped. The spring can be connected directly or indirectly to the wiper arm joint section and the wiper foot joint section, respectively, to generate the desired preload. The joint can advantageously be configured so that the wiper unit can be adjusted between the working position and a maintenance position, in which the wiper arm is pivoted at least 90° about a pivot axis perpendicular to the longitudinal direction of the wiper arm relative to the wiper foot.Optionally, the joint's kinematics can also be configured so that the spring can hold the wiper arm and wiper foot in this maintenance state of the wiper unit. Consequently, the maintenance state also results in a stable relative position of the wiper arm and wiper foot.

[0017] In the present context, a “configuration” is synonymous with a “design” and / or “setup”, so that the phrase “configured so that” is synonymous with the phrase “designed and / or set up so that”.

[0018] According to an advantageous embodiment, a wiper foot spoiler can be formed on the wiper foot body. Such a wiper foot spoiler is configured to generate pressure of the wiper blade against a window to be wiped during operation of the motor vehicle equipped with the wiping device, particularly at higher speeds.

[0019] According to the invention, a wiper arm spoiler is formed on the wiper arm body. Such a wiper arm spoiler is configured to generate pressure of the wiper blade against a window to be wiped during operation of the motor vehicle equipped with the wiping device, particularly at higher speeds.

[0020] According to an advantageous configuration, the wiper arm body can have a first longitudinal end at which the wiper arm joint section is located, a second longitudinal end at which the wiper blade holder is located, and a longitudinal direction extending from the first longitudinal end to the second longitudinal end. The longitudinal direction thus extends along the elongated wiper arm body and can be straight or slightly curved.

[0021] According to an advantageous embodiment, the wiper arm body can be configured as a hollow body and have a hollow profile transverse to the longitudinal direction. This makes the wiper arm body extremely lightweight, while simultaneously providing high rigidity against twisting about the longitudinal axis.

[0022] A further development is advantageous in which the hollow profile tapers longitudinally from the first end to the second. This measure leads to a reduced weight of the wiper arm body. At the same time, the flow resistance of the wiper arm body or wiper arm is reduced in the area of ​​the wiper blade.

[0023] According to an advantageous embodiment, the wiper arm spoiler can be formed on the wiper arm body between the wiper blade holder and the wiper arm joint section with respect to the longitudinal direction. This allows the wiper arm spoiler to be dimensioned relatively large with respect to the longitudinal direction and configured with sufficient efficiency.

[0024] According to another advantageous embodiment, the wiper arm body can have an outer contour transverse to the longitudinal direction, wherein the outer contour in the area of ​​the wiper arm spoiler does not project beyond the outer contour in the area of ​​the wiper arm joint section. In other words, the wiper arm spoiler is shaped on the wiper arm body in such a way that it does not project transversely to the longitudinal direction beyond the outer contour defined in the area of ​​the wiper arm joint section. This results in an extremely compact wiper arm spoiler, and in particular, it does not create any visually disruptive contour on the wiper arm.

[0025] According to another advantageous embodiment, the wiper foot body can have an outer contour transverse to the longitudinal direction, wherein the outer contour in the area of ​​the wiper foot spoiler does not project beyond the outer contour in the area of ​​the drive bracket. In other words, the wiper foot spoiler is shaped on the wiper foot body in such a way that it does not project transversely to the longitudinal direction beyond the outer contour defined in the area of ​​the drive bracket. This results in an extremely compact wiper foot spoiler, and in particular, it does not create any visually disruptive contours on the wiper foot.

[0026] It may be advantageous to design the maintenance opening between the wiper arm spoiler and the wiper arm joint section on the wiper arm body. This results in a compact design.

[0027] When the wiper unit is installed on the vehicle, the wiper blade rests on a window. In an advantageous embodiment, the wiper arm can be configured such that a flow channel is formed between the wiper blade and the wiper arm spoiler, through which an airflow can pass. This improves the airflow across the window. In particular, a wiper blade spoiler formed on the wiper blade can be additionally exposed to the airflow, thus improving the pressure of the wiper blade against the window.

[0028] According to the invention, when the wiper unit is installed on the motor vehicle, the wiper blade rests on a window of the motor vehicle, the wiper arm spoiler having a flat spoiler cross-section and a spoiler front facing away from the window and a spoiler back facing the window. The flat spoiler cross-section can be configured, in particular, as rectangular. A spoiler length extending along the spoiler front and rear within the spoiler cross-section is at least twice, preferably at least five times, greater than a spoiler thickness extending from the spoiler front to the spoiler back within the spoiler cross-section. The spoiler front can have a front section, in particular a straight one, within the spoiler cross-section.The rear of the spoiler can have a rear section, particularly a straight one, which extends substantially equidistant from the front section. "Substantially" here means a deviation of no more than 10°. In other words, the wiper arm spoiler has at least a partially constant spoiler thickness. Specifically, if the front and rear sections are straight, they can be designed to run substantially parallel to each other. "Substantially" here means an angle of inclination of no more than 10°.

[0029] According to the invention, the wiper arm spoiler has a spoiler recess on the rear side of the spoiler cross-section. The spoiler thickness is minimal in this spoiler recess. This spoiler recess creates a pressure drop in the flow channel, which improves the airflow around the wiper arm spoiler and the airflow towards the windshield.

[0030] A particularly advantageous configuration is one in which the spoiler recess on the rear side of the spoiler is positioned closer to a leading edge than to a trailing edge of the wiper arm spoiler. Preferably, the spoiler recess can be formed between the leading edge of the wiper arm spoiler and the aforementioned rear section, where the spoiler thickness is essentially constant. This improves the pressure drop in the flow channel.

[0031] According to an advantageous embodiment, the wiper arm body can have a substantially square cross-section, preferably a substantially rectangular cross-section, transversely to the longitudinal direction in the area of ​​the wiper blade holder. The wiper arm body can also have a substantially square, preferably rectangular, cross-section transversely to the longitudinal direction in the area of ​​the wiper arm joint section. Furthermore, the wiper arm body can have a substantially square, in particular rectangular, preferably flat cross-section transversely to the longitudinal direction in the area of ​​the spoiler. In this way, the integration of the spoiler into the outer contour of the wiper arm or wiper arm body is used to reduce the cross-section of the wiper arm body in the area of ​​the spoiler. The wiper arm presented here is therefore extremely lightweight.

[0032] A wiping device according to the invention for a motor vehicle for wiping a windshield of the motor vehicle comprises at least one wiper blade for wiping the windshield, at least one wiper drive for driving the wiper blade relative to the windshield, and at least one wiper unit of the type described above for connecting the wiper drive to the wiper blade. Advantageously, the respective wiper blade can be configured as a flat blade wiper.

[0033] A motor vehicle according to the invention has at least one window, preferably a windshield and / or a rear window, and at least one wiping device of the type mentioned above for wiping the window.

[0034] Further important features and advantages of the invention will become apparent from the dependent claims, the drawings and the associated description of the figures based on the drawings.

[0035] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention as defined by the claims. Components of a higher-level unit, such as a device, apparatus, or arrangement, mentioned above and those to be mentioned below, which are designated separately, can form separate parts or components of this unit or be integral areas or sections of this unit, even if this is depicted differently in the drawings.

[0036] Preferred embodiments of the invention are shown in the drawings and are explained in more detail in the following description, wherein identical reference numerals refer to identical or similar or functionally identical components.

[0037] They show, schematically, Fig. 1 an isometric front view of a motor vehicle in the area of ​​a wiper mechanism, Fig. 2 an isometric rear view of the motor vehicle in the area of ​​another wiper device, Fig. 3 a top view of a driver's side, front wiper unit of the wiper system, Fig. 4 an enlarged cross-section of the wiping unit corresponding to section lines IV in Fig. 3, Fig. 5 an enlarged cross-section of the wiping unit corresponding to section lines V in Fig. 3, Fig. 6 an enlarged cross-section of the wiping unit corresponding to section lines VI in Fig. 3, Fig. 7 a top view of a passenger-side, front wiper unit of the wiper system, Fig. 8 an enlarged cross-section of the wiping unit corresponding to section lines VIII in Fig. 7, Fig. 9 an enlarged cross-section of the wiping unit corresponding to section lines IX in Fig. 7, Fig. 10 an enlarged cross-section of the wiping unit corresponding to section lines X in Fig. 7, Fig. 11 a top view of a rear wiper unit of the wiper system, Fig. 12 an enlarged cross-section of the wiping unit corresponding to section lines XII in Fig. 11, Fig. 13 an enlarged cross-section of the wiping unit corresponding to section lines XIII in Fig. 11, Fig. 14 an enlarged cross-section of the wiping unit corresponding to section lines XIV in Fig. 11, Fig. 15 a cross-section as in the Fig. 6, Fig. 10 and Fig. 14, however, during the operation of the wiping device.

[0038] According to the Fig. 1 and Fig. 2 comprises a motor vehicle 1, only partially depicted here, which may preferably be a passenger car, a disc 2, which is in Fig. 1 is a front glass or windshield and in Fig. 2 is a rear window. Furthermore, the motor vehicle 1 comprises a wiping device 3 configured for wiping the window 2. The wiping device 3 has at least one wiper blade 4 configured for wiping the window 2 and resting on the window 2 for this purpose, and at least one wiper drive 5 for driving the wiper blade 4 relative to the window 2. The wiper blade 4 can preferably be configured as a flat blade wiper 4. In the example of the Fig. 1 The wiping device 3 has two wiper blades 4 and two wiper drives 5. The two wiper drives 5 can be connected to a common drive motor (not shown here), which drives the respective wiper drive 5 to perform the wiping movement. In the example of the Fig. In Figure 2, the wiping device 3 has only one wiper blade 4 and only one wiper drive 5. The wiper drive 5 can be connected to a drive motor (not shown here) which drives the wiper drive 5 to perform the wiping movement.

[0039] Each wiping device 3 is also equipped with at least one wiping unit 6, which is configured to connect the respective wiping drive 5 to the respective wiping blade 4. Accordingly, in Fig. 1 In the front-side arrangement, two such wiper units 6 are also provided, namely a front-side driver's side wiper unit 6 and a front-side passenger's side wiper unit 6, while in Fig. 2. In the rear-side arrangement, only one such wiper unit 6 is provided, namely a rear-side wiper unit 6. The driver-side wiper unit 6 is located in the Fig. 3, Fig. 4, Fig. 5 to Fig. 6 shown enlarged. The passenger-side wiper unit 6 is located in the Fig. 7, Fig. 8, Fig. 9 to Fig. 10 shown enlarged. The rear wiper unit 6 is in the Fig. 11, Fig. 12, Fig. 13 to Fig. 14 shown enlarged.

[0040] According to the Fig. In sections 1 to 3, 7 and 11, the respective wiper unit 6, configured to hold the wiper blade 4 of the wiper assembly 3 of the motor vehicle 1, has a wiper arm 7, a wiper foot 8, and a joint 9 that articulates the wiper arm 7 to the wiper foot 8. For this purpose, the joint 9 has a wiper arm joint section 10 and a wiper foot joint section 11 articulates to it, e.g., by means of a bearing pin (not shown). The wiper blade holder 13 is configured to secure the wiper blade 4 to the wiper arm body 12 and may, for example, have a receptacle for inserting a complementary receiving part formed on the wiper blade 4. Advantageously, the wiper blade holder 13 may also have a detent connection for fixing the receiving part inserted into the receptacle to the wiper arm body 12. Fig. 3, Fig. 7 and Fig. In each case 11 an opening 18 is visible, through which a locking element can be actuated to release the locking connection.

[0041] The wiper arm 7 has a wiper arm body 12 made in one piece from carbon fiber, on which the wiper arm joint section 10 is formed. The wiper arm 7 also has a wiper blade holder 13 formed on the wiper arm body 12 for securing the wiper blade 4 to the wiper arm body 12. The wiper foot 8 has a wiper foot body 14 made in one piece from carbon fiber, on which the wiper foot joint section 11 is formed. The wiper foot 8 also has a drive mount 15, which is configured for securing the wiper unit 6 to the wiper drive 5 of the wiper assembly 3. The wiper unit 6, attached to the wiper drive 5, is then rotated about a pivot axis D, which is located in the Fig. 3, Fig. 7 and Fig. 11 is positioned vertically on the drawing plane, adjustable by oscillating and rotating motion.

[0042] The joint 9 has a spring 16 for holding the wiper arm 7 and the wiper foot 8 in an operating state AZ of the wiper unit 6. The operating state AZ is described in the Fig. Figures 1 to 3, 7 and 11 are shown. The joint 9 allows the wiper arm 7 to pivot relative to the wiper foot 8 by a distance into the Fig. 3, Fig. 7 and Fig. The pivot axis S is shown in Figure 11. The wiper arm 7 can be advantageously pivoted about this pivot axis S by at least 90° relative to the wiper foot 8 to set a maintenance state of the wiper unit 6. In particular, the joint 9 can be configured so that the spring 16 can also maintain the maintenance state. The wiper arm body 12 has a maintenance opening 17 through which the spring 16 of the joint 9 is accessible. In the operating state AZ, the spring 16 serves to pre-tension the wiper blade 4 against the disc 2. For this purpose, the spring 16 can be held and tensioned within the joint 9 on one side at the wiper arm joint section 10 and thus on the wiper arm 7, and on the other side at the wiper foot joint section 11 and thus on the wiper drive 5, such that it can generate the desired pre-tension to press the wiper blade 4 against the disc 2.

[0043] In the wiper unit 6 presented here, a wiper arm spoiler 19 is formed on the wiper arm body 12. A wiper foot spoiler 20 is also formed on the wiper foot 8. The wiper arm spoiler 19 and the wiper foot spoiler 20 are configured to generate pressure of the wiper blade 4 against the windscreen 2. This pressure is generated during the vehicle 1's travel by the airflow and the forced flow deflection at the wiper arm spoiler 19 and the wiper foot spoiler 20, respectively. The maintenance opening 17 is configured such that at least one component of the wiper assembly 3, namely the spring 16, is accessible through it. For example, a visual inspection of the spring 16 can be carried out through the maintenance opening 17. Furthermore, the spring 16 can be attached to or detached from the wiper arm joint section 10 and / or the wiper foot joint section 11 through the maintenance opening 17 in order to mount the wiper arm 7 on the wiper foot 8 or vice versa.to be able to dismantle it.

[0044] The wiper arm body 12 has a first longitudinal end 21, a second longitudinal end 22, and a longitudinal direction 23 extending from the first longitudinal end 21 towards the second longitudinal end 22. The wiper arm bracket 13 is located at the first longitudinal end 21, while the wiper arm joint section 10 is formed at the second longitudinal end 22. The wiper arm body 12 is preferably configured as a hollow body, such that it has a hollow profile 24 transverse to the longitudinal direction 23. Fig. 5, Fig. 9 and Fig. Figures 13 each show a cross-section of the wiper arm body 12 perpendicular to the longitudinal direction 23 in the area of ​​the maintenance opening 17. The hollow profile 24 is visible here in the area of ​​the maintenance opening 17 and is also configured open diametrically opposite the maintenance opening 17. In contrast, the Fig. 6, Fig. 10 and Fig. 12 each a cross-section of the wiper arm body 12 running transversely to the longitudinal direction 23 in the area of ​​the wiper arm spoiler 19. Here the hollow profile 24 is configured closed.

[0045] Similarly, the wiper foot body 14 also has a first longitudinal end 21', a second longitudinal end 22', and a longitudinal direction 23' extending from the first longitudinal end 21' towards the second longitudinal end 22'. The drive bracket 15 is located at the first longitudinal end 21', while the wiper foot joint section 11 is formed at the second longitudinal end 22'. The wiper foot body 14 is preferably configured as a hollow body, such that it has a hollow profile 24' transverse to the longitudinal direction 23'. Fig. 4, Fig. 8 and Fig. Figures 14 each show a cross-section of the wiper foot body 14 running transversely to the longitudinal direction 23' in the area of ​​the wiper foot spoiler 20. Here the hollow profile 24' is configured as closed.

[0046] According to the Fig. 3, Fig. 7 and Fig. 11. It may be expediently provided that the hollow profile 24 of the wiper arm body 12 tapers in the longitudinal direction 23 from the first longitudinal end 21 to the second longitudinal end 22. At least it is discernible how an outer contour 25 extending transversely to the longitudinal direction 23, or a wiper arm width 26 extending transversely to the longitudinal direction 23, decreases from the first longitudinal end 21 in the longitudinal direction 23 to the second longitudinal end 22. In contrast, it may be provided that the hollow profile 24' of the wiper foot body 14 extends in the longitudinal direction 23' between the first longitudinal end 21' and the second longitudinal end 22' with a constant wiper foot width 26', or with an outer contour 25' extending transversely to the longitudinal direction 23' that remains substantially constant.

[0047] The wiper arm spoiler 19 is formed on the wiper arm body 12 between the wiper blade holder 13 and the wiper arm joint section 10 with respect to the longitudinal direction 23. In the wiper unit 6 presented here, the integrated wiper arm spoiler 19 remains within the outer contour 25, which is defined by the areas of the wiper arm body 12 that lie outside the wiper arm spoiler 19 with respect to the longitudinal direction 23. This allows, in particular, the outer contour 25 in the area of ​​the wiper arm spoiler 19 to not project beyond the outer contour 25 in the area of ​​the wiper arm joint section 10 in a transverse direction to the longitudinal direction 23. Since the wiper arm body 12 tapers in the longitudinal direction 23 from the wiper arm joint section 10 to the wiper blade holder 13, its outer contour 25 in the area of ​​the wiper blade holder 13 also does not protrude beyond the outer contour 25 in the area of ​​the wiper arm joint section 10, perpendicular to the longitudinal direction 23.

[0048] The wiper foot spoiler 20 is formed on the wiper foot body 14 between the drive bracket 15 and the wiper foot joint section 11 with respect to the longitudinal direction 23'. In the wiper unit 6 presented here, the integrated wiper foot spoiler 20 remains within the outer contour 25', which is defined by the areas of the wiper foot body 14 that lie outside the wiper foot spoiler 20 with respect to the longitudinal direction 23'. This allows, in particular, the outer contour 25' in the area of ​​the wiper foot spoiler 20 to not project beyond the outer contour 25' in the area of ​​the drive bracket 15 in a transverse direction to the longitudinal direction 23'. Since the wiper foot body 14 extends in the longitudinal direction 23' between the wiper foot joint section 11 and the drive bracket 15 with a constant outer contour 25' or constant wiper foot width 26', the outer contour 25' in the area of ​​the wiper foot joint section 11 does not project beyond the outer contour 25' in the area of ​​the drive bracket 15 transversely to the longitudinal direction 23'.

[0049] The maintenance opening 17 is preferably formed on the wiper arm body 12 between the wiper arm spoiler 19 and the first longitudinal end 21, in particular between the wiper arm spoiler 19 and the wiper arm joint section 10, with respect to the longitudinal direction 23.

[0050] The wiper arm body 12 exhibits, according to the Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13 to Fig. 14 a top side facing away from disk 2 27 as well as one in the Fig. 5, Fig. 6, Fig. 9, Fig. 10, Fig. 13 and Fig. 14. The underside 28, facing the disc 2, is recognizable. The maintenance opening 17 is conveniently formed on the upper side 27.

[0051] The wiper arm body 12 has, according to the Fig. 5, Fig. 9 and Fig. 13 in the area of ​​the wiper arm joint section 10 transverse to the longitudinal direction 21, has a substantially rectangular cross-section. The wiper arm body 12 can also preferably have a substantially rectangular cross-section or an substantially rectangular outer contour 25 in the area of ​​the wiper blade holder 13. The wiper arm body 12 also has, according to the Fig. 6, Fig. 10 and Fig. 14 in the area of ​​the wiper arm spoiler 19 transverse to the longitudinal direction 21 a substantially square, in particular rectangular and preferably flat cross-section or a substantially square, in particular rectangular and / or flat outer contour 25.

[0052] Fig. Figure 15 shows a sectional view of the wiper unit 6 in the area of ​​the wiper arm spoiler 19 with the wiper assembly 3 mounted on the vehicle 1. Accordingly, it can be seen that the wiper blade 4 rests on the windshield 2 of the vehicle 1. The wiper arm 7 is configured here such that a flow channel 29 is formed between the wiper blade 4 and the wiper arm spoiler 19, through which a Fig. The airflow 30, indicated by arrows, can flow through the wiper blade 4. This airflow 30 is generated, in particular, by the wind while the vehicle 1 is in motion. A wiper blade spoiler 31 can be formed on the wiper blade 4, which is exposed to the airflow 30 in the flow channel 29.

[0053] Furthermore, the wiper arm spoiler 19 can be provided with a flat spoiler cross-section 40 extending transversely to the longitudinal direction 23 of the wiper arm body 12, and a spoiler front 32 facing away from the disc 2, as well as a spoiler rear 33 facing the disc 2. The spoiler front 32 can have a preferably straight front section 34 within the spoiler cross-section 40. The spoiler rear 33 can have a preferably straight rear section 35 within the spoiler cross-section 40, which extends substantially equidistant from the front section 34. Thus, the wiper arm spoiler 19 has at least a partially constant spoiler thickness 36. The straight front section 34 and the straight rear section 35 run substantially parallel to each other.

[0054] In the advantageous embodiment shown here, the wiper arm spoiler 19 has a spoiler recess 37 in the spoiler cross-section 40 on the rear side 35 of the spoiler. The spoiler thickness 36 is at its minimum in this spoiler recess 37. In a preferred configuration, the spoiler recess 37 on the rear side 35 of the spoiler is located close to a leading edge 38 of the wiper arm spoiler 19, i.e., closer to the leading edge 38 than to a trailing edge 39 of the wiper arm spoiler 19. Thus, the spoiler recess 37 is formed between the leading edge 38 and the straight rear section 35.

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