Wiper blade, especially for a motor vehicle, with at least one air outlet

Abstract

A wiper blade (8), particularly for a motor vehicle (1), comprising an elongated base body (30) and a wiper strip (31) arranged on the base body (30), which is guided over a disc (2) during operation, wherein at least one cavity (34) extending along a longitudinal dimension (33) of the base body (30) is formed on the base body (30). It is proposed that at least one air outlet (40) be provided on at least one longitudinal side (35) of the base body (30), through which air (41) can be guided from the at least one cavity (34) during operation, and that the at least one air outlet (40) is directed at least partially towards the disc (29) during operation. Furthermore, a wiping device (3) is specified.

Description

State of the art

[0001] The invention relates to a wiper blade, particularly for a motor vehicle. Specifically, the invention relates to passenger cars (PCs) and trucks (Trucks).

[0002] DE 10 2021 212 195 A1 discloses a wiper blade with a wind deflector strip and a wiper bar. The wind deflector strip has a hollow space. The wiper bar is connected to the wind deflector strip via two spring rails. The hollow space serves as a reservoir for a cleaning fluid. Disclosure of the invention

[0003] The wiper blade according to the invention with the features of claim 1 and the wiper device with the features of claim 8 have the advantage of enabling an improved design and functionality. This allows for an improved wiper performance when wiping a windshield. In addition, aqueous liquids can be wiped away from the visible area of ​​the windshield in an improved manner.

[0004] The measures listed in the subclaims result in further advantageous developments and improvements of the wiper blade and the wiper device.

[0005] The wiper arm is not a component of the wiper blade according to the invention. In particular, the wiper blade can also be manufactured and sold independently of a wiper arm.

[0006] It is advantageous that the at least one air outlet, through which air can be guided from the at least one cavity during operation, is provided on only one long side of the base body. This allows for more effective removal of, for example, an aqueous liquid from the wiper strip on this long side.

[0007] It is advantageous that a mounting direction is predetermined in which the wiper blade can be mounted on a wiper arm, and that the long side of the base body, on which the at least one air outlet is provided, is oriented away from a region of the windshield swept by the wiper strip during operation in an end position of the wiper arm in which the wiper blade is oriented at least approximately vertically, when the wiper blade is mounted on the wiper arm in the mounting direction. Especially in the vertical position, an aqueous liquid, for example, adheres to the wiper strip and can be drawn back into the field of vision after the wiper arm reverses its movement. A blast of air can reduce or at least substantially prevent the retraction of an aqueous film.

[0008] It is advantageous that at least one air outlet is designed as an at least substantially slot-shaped air outlet. This allows for the beneficial effect of an air blast to be achieved.

[0009] It is advantageous to provide a plurality of at least substantially slot-shaped air outlets, which are spaced apart from one another along the longitudinal extent of the base body and / or arranged at least substantially adjacent to one another. This reliably ensures a suitable gap width of the air outlets over the entire service life.

[0010] It is advantageous that a rigid frame is provided, that the base body has a header and a web, that the base body can be connected to the rigid frame at its header, wherein the rigid frame encloses the base body on the long side and on a further long side facing away from the long side, and that the at least one air outlet has an outlet opening arranged on the web. This allows the outlet to be arranged close to the pane, and at the same time, the air jet can be directed to the aqueous liquid on the pane at an advantageous angle to the pane.

[0011] It is advantageous for the cavity to be formed at least partially in the header and, if necessary, partially in the web. This allows for a space-optimized design. In addition, a favorable connection to at least one air outlet can be achieved.

[0012] Especially in a wiper device, it is advantageous to provide at least one air pump that can be activated by a rotational movement of the wiper arm, and to generate a pneumatic pressure pulse from the air pump, which, when installed, is directed into the cavity of the wiper blade. This makes it possible to achieve independence from other devices and to enable easy adaptation of existing systems.

[0013] It is advantageous that a cam is provided that rotates with the rotational movement of the wiper arm, and that the air pump is actuated by the cam. This allows for a reliable generation of an air blast without the need for special control systems.

[0014] It is advantageous that, at least approximately in an end position of the wiper arm, in which the wiper blade is oriented at least approximately vertically, a pneumatic pressure pulse is directed into the cavity of the wiper blade. This allows for easy timing.

[0015] It is advantageous that a pneumatic pressure pulse is directed into the cavity of the wiper blade at least approximately in an end position of the wiper arm and preferably before a reversal of the wiper arm's movement. This allows an air pulse to be generated at a preferred time or at a preferred position of the wiper arm.

[0016] One or more of the following features and advantages can be realized depending on the design and desired functionality.

[0017] A motor vehicle's wipers are designed to ensure adequate visibility for the driver, especially in rainy conditions. The largest possible field of vision is desirable, and a certain field of vision is usually specified for the driver.

[0018] Cohesive forces can act between a wiper strip and a film of water, or water droplets, or the like, on the windshield and a wiper strip. Due to the surface tension of the water, water swept to the side can be drawn back after a reversal of motion. This can draw water surfaces and / or streaks into the driver's field of vision. A blast of air can overcome the surface tension of the water, so that the water swept to the side preferably remains at least substantially on the side and thus out of the field of vision.

[0019] At higher speeds, a faster wiper movement is generally required. This can promote the effect of surface tension on the wiper blade and the water on the windshield.

[0020] The air blast directed onto the water via at least one air outlet can reduce surface tension. The driver's field of vision can be increased accordingly, or even improved.

[0021] For example, the wiper can move the water from the windshield to the A-pillar in a first movement. A second movement can move the wiper back to its original position at the bottom edge of the windshield.

[0022] When the water is forced into a vertical position by the first sweep and the wiper then begins the second sweep, the water film tends to cling to the wiper blade due to surface tension. This can pull the water film back into the field of vision. The air blast ensures that the water wiped onto the A-pillar essentially stays there. This preserves the driver's field of vision, improving safety.

[0023] One potential advantage is that the water film's surface tension reduces the likelihood of it being pulled back onto the wiped windshield. This is especially true when driving in the rain.

[0024] This improves visibility for the driver, thereby improving safety for all road users.

[0025] It goes without saying that the design of the wiper blade is not limited to a driver's field of vision. It can also be used for a passenger, for example, or on a rear window.

[0026] Preferably, the air blast is generated by compressed air guided through the at least one air outlet. This compressed air can be generated during the first movement of the wiper arm. In particular, the first movement of the wiper arm can actuate a cylinder piston that defines an air space in a cylinder bore to compress the air in the air space.

[0027] The cylinder piston can be actuated via a cam, for example, attached to an electric motor or a bearing of the wiper arm, or to the wiper arm. The cylinder piston can then be reset during the second movement of the wiper arm, after the water film has been removed from the wiper strip by an air curtain. The air space can be filled via a check valve, for example, as in a piston air pump, to prevent air from being sucked in via at least one air outlet of the wiper blade.

[0028] If the water is at a distance from the wiper strip (wiper lip), the surface tension of the water there is reduced to approximately zero, i.e. the surface tension disappears at least essentially, so that the water collected by wiping does not stick to the wiper strip. Short description of the drawings

[0029] Preferred embodiments of the invention are explained in more detail in the following description with reference to the accompanying drawings, in which corresponding elements are provided with identical reference numerals. They show: Fig. 1 shows a motor vehicle with a windscreen and a wiper device with wipers in a partial, schematic representation according to an exemplary embodiment, wherein a first movement of a wiper arm towards an A-pillar of the motor vehicle is shown; Fig. 2 that in Fig. 1 shows a motor vehicle and a schematic detailed view illustrating an air blast, wherein a second movement of the wiper arm away from the A-pillar of the motor vehicle is shown; Fig. 3 that in Fig. 1 shows a motor vehicle and a schematic detailed illustration to explain the generation of the air blast, wherein the second movement of the wiper arm away from the A-pillar of the motor vehicle is shown; and Fig. 4 shows a profile of a wiper with a wiper blade viewed perpendicular to a longitudinal extent of the wiper blade in a schematic representation as well as the window of the motor vehicle in an excerpted representation, wherein the wiper is shown in a position during a reversal of movement on the A-pillar. Embodiments of the invention

[0030] Fig. Figure 1 shows a motor vehicle 1 with a windshield 2 and a wiper device 3 with wipers 4, 5 in a partial, schematic representation according to an exemplary embodiment. The wipers 4, 5 have wiper arms 6, 7 and wiper blades 8, 9. Fig. 1 shows a first movement of the wiper arm 6 toward an A-pillar 10 of the motor vehicle 1. The motor vehicle can be designed, in particular, as a car or truck.

[0031] Furthermore, Fig. 2 that in Fig. 1 shows motor vehicle 1 and a schematic detailed illustration II to illustrate an air blast, wherein in Fig. 1 shows a second movement of the wiper arm 6 away from the A-pillar 10 of the motor vehicle 1 and in detail II an end position 55 of the wiper blade 8 on the A-pillar 10. In addition, Fig. 3 that in Fig. 1 shows motor vehicle 1 as well as a schematic detailed illustration III to explain the generation of the air blast, wherein the second movement of the wiper arm 6 away from the A-pillar 10 of the motor vehicle 1 is also shown.

[0032] During operation, the wiper blades 8, 9 are moved in a pendulum motion across the windshield 2 of the motor vehicle 1 by the wiper arms 6, 7, wherein the pendulum motion creates an imaginary pendulum axis. At the first end 15, 16 of the respective wiper blade 8, 9, which is closer to this respective pendulum axis, this end 15, 16 moves along an inner path 18, 18. Accordingly, the second end 19, 20 of the wiper blade 8, 9, which is further away from the respective pendulum axis, moves along an outer path 21, 22. The inner path 18, 19 and the outer path 21, 22 are circular or elliptical paths, wherein the radius of the inner path 18, 19 is smaller than the radius of the outer path 21, 22.

[0033] The design of the wiper device 3 is explained in more detail below with reference to the wiper 4. In this case, the wiper 4 can serve the driver's side. However, the wiper 5 can also be designed accordingly, for example, to achieve a corresponding effect on the passenger side. Furthermore, such a design can also be implemented, for example, on a rear window of the motor vehicle 1, for a wiper that may be provided there.

[0034] Fig. Figure 4 shows the wiper blade 8 for the wiper arm 6 in a schematic profile view as well as the windscreen 2 in a partial, schematic view. The wiper blade 8 has an elongated base body 30 and a wiper strip 31 arranged on the base body 30. During operation, the wiper strip is guided over the windscreen 2 in contact with the windscreen 2, taking along in particular rainwater and / or an aqueous cleaning fluid as well as any foreign matter transported with the fluid and, during the first movement ( Fig. 1) to the A-pillar 10.

[0035] On the base body 30 there is a longitudinal extension 33 ( Fig. 2) of the base body 30 extending cavity 34 ( Fig. 4) is formed. Fig. 4 the profile of the wiper blade 8 of the wiper 4 viewed perpendicular to the longitudinal extent of the wiper blade.

[0036] An air outlet 40 is provided on a longitudinal side 35 of the base body 30. Preferably, several such air outlets 40 are provided, wherein in the profile view of the Fig. 4, only one air outlet 40 is shown. At a suitable time, air 41 is guided from the cavity 34 via the air outlet 40. The air 41 is directed onto the pane 29. This preferably takes place in the form of at least one air blast. Fig. 4 illustrates the exit of the air 41 in the form of at least one air blast.

[0037] The air outlets 40, through which air 41 is expelled from the cavity 34 during operation, are provided in this embodiment only on a single longitudinal side 35 of the base body 30. In this case, a mounting direction 42 ( Fig. 2) in which the wiper blade 8 is mounted on a wiper arm 6. The mounting direction 42 can be clearly specified by the attachment of the wiper blade 8 to the wiper arm 6 if this attachment allows only one mounting direction 42.

[0038] During operation, the wiper strip 31 sweeps over an area 46 of the windshield 2. The longitudinal side 35 of the base body 30, on which the air outlets 40 are provided, is oriented away from the swept area 46 of the windshield 2 in an end position 55 of the wiper arm 6, in which the wiper blade 8 is oriented at least approximately vertically. In this exemplary embodiment, the air outlets 40 are oriented toward the A-pillar 10 in the end position 55. Furthermore, the air outlets are directed toward the windshield 2 approximately in the direction 49, which points toward the windshield 2.

[0039] In a preferred embodiment, one or more air outlets 40 are designed as slot-shaped air outlets 40. In this exemplary embodiment, several slot-shaped air outlets 40 are provided, which are arranged adjacent to one another at a distance from one another along the longitudinal extension 33 of the base body 30. In a different embodiment, it is also conceivable, for example, for several slot-shaped air outlets 40 to be arranged parallel to one another.

[0040] In this exemplary embodiment, the wiper blade 8 has a rigid frame 32, to which it can be attached to the wiper arm 6. The base body 30 comprises a head strip 47 and a web 48. The base body 30 is connected to the rigid frame 32 at its head strip 47. In this exemplary embodiment, the rigid frame 32 surrounds the base body 30 on the opposite longitudinal sides 35, 36.

[0041] In this embodiment, the air outlets 40 are provided on the longitudinal side 35. In this embodiment, several openings 50 are formed on the web 48 for the air outlets 40. The cavity 34 can be formed entirely or partially in the header strip 47. In this embodiment, the cavity 34 is also partially formed in the web 48.

[0042] In this embodiment, an air pump 51 is provided to generate the air blasts at the upper end position 55. Upon rotation of the wiper arm 6, the air pump 51 is actuated, so that a pneumatic pressure blast is generated by the air pump 51. The pneumatic pressure blast is then directed into the cavity 34 of the wiper blade 8.

[0043] To actuate the air pump 51, a cam 52 is provided, which can be mounted on a bearing 53 of the wiper arm 6 in a rotationally fixed manner to the wiper arm 6, so that it rotates with the rotational movement of the wiper arm 6. The cam 52 then actuates the air pump 51.

[0044] In this exemplary embodiment, the air pump 51 is actuated via the cam 52 or by other means in an end position 55 of the wiper arm 6, in which the wiper blade 8 is oriented at least approximately vertically. The pneumatic pressure pulse is preferably generated before a reversal of the wiper arm 6's movement. Preferably, the discharge of air via the air outlets 40 begins before the reversal of the movement.

[0045] Thus, the air 55 acts on the water 57, so that the water 57 remains on the side 57 after the reversal of movement, as shown in detail II of the Fig. 2. This is illustrated here as an example at the end position 55 of the wiper arm 6.

[0046] Accordingly, an air blast can be generated at an end position 56 on the wiper blade 9. Furthermore, an air blast can also be generated additionally or alternatively at at least one further end position. Furthermore, several air blasts can also be generated in quick succession.

[0047] The cam 52 can actuate a tappet 60 of a cylinder piston 61 of the air pump 51. The cylinder piston 61 can be guided in a cylinder bore 62 and there define a pneumatic pump chamber 63. The cylinder piston 61 can be designed at the edge, similar to a bicycle pump, to form a directional valve, so that air can flow into the pump chamber 63 at least substantially directly and not necessarily indirectly via the cavity 34 during resetting.

[0048] Thus, at the end position 55, the water wiped from the swept area 46 can be wiped to the side, i.e. in this embodiment towards the A-pillar 10, whereby a blast of air acts on the water wiped to the side. This counteracts the surface tension of the water and leads to a reduction in the thickness of the water film or to the water film breaking off during the backward movement. This avoids or completely prevents the water film from being drawn into the area 46. In a remote embodiment, the air pump 51 can also be actuated externally, in particular with an electric motor, at an end position 55, 56, so that, for example, at an end position 55, 56, several pump strokes are possible to generate several blasts of air.

[0049] The invention is not limited to the described embodiments. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2021 212 195 A1

[0002]

Claims

[1] Wiper blade (8), in particular for a motor vehicle (1), with an elongated base body (30) and a wiper strip (31) arranged on the base body (30), which is guided over a window (2) during operation, wherein at least one cavity (34) extending along a longitudinal extent (33) of the base body (30) is formed on the base body (30), characterized by that at least one air outlet (40) is provided on at least one longitudinal side (35) of the base body (30), via which air (41) can be guided out of the at least one cavity (34) during operation, and that the at least one air outlet (40) is directed at least partially towards the pane (29) during operation. [2] Wiper blade according to claim 1, characterized by that the at least one air outlet (40), via which air (41) can be guided out of the at least one cavity (34) during operation, is provided only on a single longitudinal side (35) of the base body (30). [3] Wiper blade according to claim 1 or 2, characterized by that a mounting direction (42) is predetermined, in which the wiper blade (8) can be mounted on a wiper arm (6), and that the longitudinal side (35) of the base body (30), on which the at least one air outlet (40) is provided, is oriented away from a region (46) of the windscreen (2) swept over by the wiper strip (31) during operation, in an end position (55) of the wiper arm (6), in which the wiper blade (8) is oriented at least approximately vertically, when the wiper blade (8) is mounted on the wiper arm (6) in the mounting direction (42). [4] Wiper blade according to one of claims 1 to 3, characterized by that at least one air outlet (40) is designed as an at least substantially slot-shaped air outlet (40). [5] Wiper blade according to claim 4, characterized bythat a plurality of at least substantially slot-shaped air outlets (40) are provided, which are spaced apart from one another along the longitudinal extent (33) of the base body (30) and / or are arranged at least substantially next to one another. [6] Wiper blade according to one of claims 1 to 5, characterized by that a rigid border (32) is provided, that the base body (30) has a head strip (47) and a web (48), that the base body (30) can be connected to the rigid border (32) at its head strip (47), wherein the rigid border (32) surrounds the base body (30) on the long side (35) and on a further long side (36) facing away from the long side (35), and that the at least one air outlet (40) has an opening (50) arranged on the web (48). [7] Wiper blade according to claim 6, characterized by that the cavity (34) is formed at least partially in the head strip (47) and optionally partially in the web (48). [8] Wiper device (3) with at least one wiper arm (6, 7) and a wiper blade (8, 9) fastened to the wiper arm (6, 7), wherein the wiper blade (8, 9) is designed according to one of claims 1 to 7. [9] Wiper device according to claim 8, characterized by that at least one air pump (51) is provided which can be actuated upon a rotational movement of the wiper arm (6, 7), and that a pneumatic pressure surge can be generated by the air pump (51), which, in the mounted state, is guided into the cavity (34) of the wiper blade (8, 9). [10] Wiper device according to claim 9, characterized by that a cam (52) is provided which rotates with the rotational movement of the wiper arm (6, 7), and that the air pump (51) can be actuated by the cam (52). [11] Wiper device according to one of claims 8 to 10, characterized by , a) that at least approximately in an end position (55, 56) of the wiper arm (6, 7) in which the wiper blade (8, 9) is at least approximately vertically oriented, a pneumatic pressure pulse is guided into the cavity (34) of the wiper blade (8, 9), and / or b) that at least approximately in an end position (55, 56) of the wiper arm (6, 7) and preferably before a reversal of movement of the wiper arm (6, 7), a pneumatic pressure surge is guided into the cavity (34) of the wiper blade (8, 9).

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