WO2020053401A1

WO2020053401A1 - Wiper, wiper system for a windscreen of a vehicle, and vehicle

Info

Publication number: WO2020053401A1
Application number: PCT/EP2019/074515
Authority: WO
Inventors: Franz Lorey; Dominik SCHÖLLMANN; Joshua KREUDER
Original assignee: Edag Engineering Gmbh
Priority date: 2018-09-14
Filing date: 2019-09-13
Publication date: 2020-03-19
Also published as: DE202018105291U1

Abstract

The present invention relates to a wiper for a wiper system for wiping a windscreen of a vehicle, comprising a body, which has at least one wiper lip along its length, the body being designed such that it can be fastened at one end to a wiper arm of the wiper system and bears freely at its other end with the at least one wiper lip against the windscreen when the wiper is installed with the wiper system on the windscreen, and comprising a parabolic spring, which prestresses the wiper arm with the wiper received thereon by a predetermined prestress so that the wiper bears along its entire length with the at least one wiper lip against the windscreen when the wiper is installed with the wiper system on the windscreen. The present invention also relates to a wiper system for a windscreen of a vehicle, and to a vehicle comprising a corresponding wiper system.

Description

WIPER, WIPER SYSTEM FOR A DISC OF A VEHICLE AND

VEHICLE

FIELD OF THE INVENTION

The present invention relates to a wiper and a wiper system for a window of a vehicle, in particular for wiping a window of a vehicle, which can in particular be a truck (truck), passenger car (car), bus, rail vehicle, etc. The invention further relates to such a vehicle with a corresponding Wi shear system

TECHNICAL BACKGROUND

Many vehicles, such as lorries, passenger cars, locomotives, etc., have at least one pane through which the occupants can view their surroundings to protect occupants, such as the driver and front passenger. For a good view through the window in all weather conditions, a wiper system is usually attached to at least the outside of the windscreen of the vehicle, which can wipe water drops and / or dirt from the window.

The problem with such wiper systems is that their components, depending on the design, impair the field of vision of the occupants of the vehicle and / or are difficult to access for assembly or maintenance. In addition, with conventional wiper systems, the wiping field, which is the wiping field on the windshield by the wiper system, is not always optimized. As a result, a non-negligible edge area of the pane cannot be wiped with the wiper system even during operation of the wiper system. As a result, the field of vision of the occupants sen by dirt present in the edge region of the window and / or water drops that cannot be removed by wiping the wiping system, for example due to rain or snow or wiping water from the wiping system.

SUMMARY OF THE INVENTION

Against this background, it is an object of the present invention to provide a wiper and a wiper system for a window of a vehicle, with which the aforementioned problems can be solved. In particular, a wiper system is to be provided for a vehicle, which maximizes the field of vision of occupants of the vehicle through a window of the vehicle in all external weather conditions.

This object is achieved by a wiper with the features of claim 1 and / or by a wiper system for a window of a vehicle with the features of the claim.

Accordingly, it is provided:

- A wiper for a wiper system for wiping a windshield of a vehicle, with a body which has at least one wiper lip along its length, the body being designed to be fastened at one end to a wiper arm of the wiper system and at the other end with the at least one egg NEN wiper lip rests freely on the windshield when the wiper is mounted on the windshield with the wiper system, and a parabolic spring that pretensions the wiper arm with the wiper attached to it with a predetermined preload, since the wiper runs along its entire length with the minimum There is at least one wiper lip on the window when the wiper with the wiper system is mounted on the window. - A wiper system for a windshield of a vehicle, with a wiper arm for detachably receiving a wiper, in particular a wiper according to the invention, for wiping the windshield, a drive device for driving the wiper arm in a movement about an axis, the wiper being a parabola has, which prestresses the wiper arm with the wiper accommodated thereon with a predetermined pretension, since the wiper lies along the entire length with the at least one wiper lip on the window when the wiper with the wiper system is mounted on the window.

- A vehicle with a cab, a chassis frame, and at least one wiper system according to the invention.

According to the invention, the wiper has a body which has at least one wiper lip along its length, the body being designed to be fastened at one end to a wiper arm of the wiper system and at the other end with the at least one wiper lip lying freely against the windshield when the wiper is mounted on the windshield with the wiper system, and a parabolic spring which prestresses the wiper arm with the wiper accommodated there with a predetermined preload so that the wiper lies against the windshield along its entire length with the at least one wiper lip when the wiper with the Wiper system is mounted on the window.

The design of the wiper or wiper system described ensures that the wiping field can always be optimally adapted to the windshield. As a result, the non-wipable edge area of the pane can be minimized. This also optimizes the occupants' field of vision for all vehicle operating conditions. Another advantage of the wiper system described is that the construction of the wiper system offers improved accessibility for the wiper drive. This results on the one hand in assembly advantages for the wiper drive and in a lower sealing effort for the drive system against rainwater, snow and ice than in other constructions.

In addition, the design of the wiper and / or wiper system realizes that the wiping water can be optimally metered and positioned in the wiping field. As a result, for example, rainwater and / or splashing water can flow along the vehicle more optimally. This increases the safety for the operation of the vehicle with regard to visibility in rainy weather or snowfall.

The wiper system also ensures that its components impair the field of vision of the vehicle's occupants as little as possible. As a result, the field of vision of the occupants is optimized for all operating conditions of the vehicle. In addition, the wiper system is thus in a protected position during a non-operation or a rest position. This also has advantages with regard to reduced corrosion on the wiper system and, if the wiper system can be mounted on the vehicle in a protected manner, for example under a sun visor, can also be provided with sun protection for the wiper system. As a result, for example, rubber embrittlement and / or aging of the wiper can be delayed. As a result, the wiper system is more durable than an exposed construction.

Advantageous refinements and developments result from the further subclaims and from the description with reference to the figures of the drawing. According to one embodiment, the wiper is designed as a multi-component component with the parabolic spring, which distributes pressure on the wiper lips of the wiper evenly along the length of the wiper.

According to one embodiment, the parabolic spring has a width that changes over the length of the wiper and / or a cross section that changes over the length of the wiper.

According to one embodiment, the parabolic spring is made of metal and / or fiber-reinforced plastic.

According to one embodiment, the wiper has two wiper lips, between which a channel for introducing wiper fluid is arranged between the wiper lips. In particular, the channel is perforated on the side which is arranged between the wiper lips and which connects the wiper lips.

According to one embodiment, the wiper system has a mechanism for generating a predetermined pivoting movement of the wiper about the axis. The mechanism has a linear guide for guiding the wiper during a translational movement due to an extension or retraction of the telescopic wiper arm. Furthermore, the mechanism has a guide for guiding the wiper arm along an eccentric path relative to the axis, and a coupling element for mechanically coupling the linear guide and the guide, so that the wiper is superimposed on the curved path by the drive device during the predetermined pivoting movement linear movement is driven via the disc.

According to one embodiment, the wiper arm is a wiper arm that is variable in length in the longitudinal direction. As an alternative or in addition, the link guide is designed in the form of a dovetail. According to one embodiment, the coupling element is designed as a gear wheel at one end and is designed as a sliding block with rollers at its other end.

According to one embodiment, the sliding block has concave side surfaces between the rollers.

According to one embodiment, the drive device is a servo motor.

According to one embodiment, the vehicle is a truck or a bus or an agricultural machine or a rail vehicle. Alternatively or additionally, the at least one wiper system is arranged under a sun visor of the vehicle.

According to one embodiment, the at least one wiper system is arranged above a window of the vehicle or below a window of the vehicle.

At least one previously described wiper system can be part of a vehicle, which also has a driver's cab and a chassis frame. The vehicle is, for example, a truck or a passenger car or a bus or an agricultural machine or a rail vehicle.

Further possible implementations of the invention also include combinations of features or embodiments described above or in the following with regard to the exemplary embodiments, which are not explicitly mentioned. In particular, all the features of a wiper can be transferred to a wiper system and vice versa. The person skilled in the art will also add individual aspects as improvements or supplements to the respective basic form of the invention. CONTENTS OF THE DRAWING

The invention is described in more detail with reference to the enclosed drawing and using exemplary embodiments. Show it:

A simplified side view of a truck as an example of a vehicle having a wiper system according to a first embodiment;

2 to 7 each a pane of the vehicle of FIG.

1, on which a wiper system according to a first exemplary embodiment is mounted and each shown in different snapshots during operation of the wiper system;

8 shows a plan view of a mechanism of the wiper system according to the first exemplary embodiment;

FIG. 9 shows a three-dimensional view of a coupling element of the mechanism from FIG. 8;

10 to 12 each show a three-dimensional view of a

Wiper of the wiper system according to the first embodiment;

13 is a three-dimensional view of a wiper for a

Wiper system according to a second exemplary embodiment; and

14 is a three-dimensional view of a wiper for a

Wiper system according to a third exemplary embodiment. The accompanying drawings are intended to provide further understanding of the embodiments of the invention. They illustrate illustrative embodiments and serve in connection with the description of the explanation of principles and concepts of the invention. Other embodiments and many of the above parts arise in view of the drawings. The elements of the drawings are not necessarily shown to scale with respect to one another.

In the figures of the drawing, elements, features and components which are the same, have the same function and have the same effect - unless otherwise stated - are each provided with the same reference characters.

DESCRIPTION OF EMBODIMENTS

Fig. 1 shows a side view of a vehicle 1, which is in Fig. 1 as an example, a truck, in particular a saddle tractor. Instead of a truck for the transport of goods, the vehicle 1 can alternatively be another vehicle, for example a passenger car (passenger car) or a bus, in particular a coach and / or double-decker bus for the transport of people. It is alternatively possible that the vehicle 1 is an agricultural machine, in particular a tractor, a combine harvester, etc., or a rail vehicle. Here, the driver, one or more passengers and other passengers are each occupants of vehicle 1. The vehicle can be any vehicle on which the features described below can be used.

The vehicle 1 is in Fig. 1 on a base 5. The vehicle 1 has a vehicle base frame or chassis or chassis frame 10, on which in the example of FIG. 1, front wheels 11 and rear wheels 12 are rotatably mounted. At its front end is the chassis frame 10 with a bumper 13 completed. On a wing 15 of the chassis frame 10, any structure for receiving goods at at least one point of the chassis frame 10 who the. For example, the structure can be a container, a box for a refrigerated truck, etc. If the vehicle 1 is not a satellite tractor, the vehicle 1 can have a platform, a platform with tarpaulin, etc. as a body.

The vehicle 1 has a driver's cab or a cab 20, which is shown in FIG. 1 in a special embodiment as an example. In the interior 21 of the cab 20, in addition to the driver, depending on the design of the vehicle 1 and the cab 20, at least one additional occupant can also be accommodated. The interior 21 is accessible via a vehicle door 22. In the example of FIG. 1, the driver's cab 20 has an A-pillar 23 on each of the two sides of the vehicle 1. In addition, the driver's cab 20 is closed to the outside by a pane 24 in its upper and front area. In addition, the vehicle 1 has a very schematically represented floor 25. A sun visor 26 is provided at the top of the vehicle 1.

On the disc 24, a wiper system 30 is mounted, which is shown only very schematically in Fig. 1, but is illustrated in more detail in the usual figures. The wiper system 30 is arranged in the example of FIG. 1 over the disc 24. The wiper system 30 can be arranged at least partially under the sun visor 26. As a result, the Wi shear system 30 is very effectively covered against the environment and thus protected.

Fig. 2 to Fig. 7 each show a partial view of the vehicle 1 of Fig. 1. Here, the disk 24 is shown ge, on which the wiper system 30 is operated. In the example shown, the disk 24 is the windshield or windshield of the vehicle 1 of FIG. 1. Each of FIG. 2 7 shows a different operating status of the wiper system 30. It goes without saying that the wiper system 30 may instead be mounted, if desired, for wiping a window 24 of the vehicle 1 other than the front window.

The pane 24 is installed in a frame or pane frame 241 of the vehicle 1 in such a way that a field of vision 242 is present, through which an occupant of the vehicle 1 can see from the driver's house 20 through the pane 24 to the outside of the cab 20. The wiper system 30 is designed and arranged such that it can wipe a wiping field 243 on the window 24, which is illustrated in FIGS. 5 to 7. In Fig. 5 to Fig. 7, the wiping field 243 is for demonstration purposes only on the left half of the pane 24 Darge. However, the wiping area 243 is actually present on the right half of the pane 24, mirrored at the center of the pane 24. At the center of the disk 24, the wiper 31 is in a position 42, which is shown in FIGS. 5 to 7.

According to FIGS. 2 to 7, the wiper system 30 has a wiper 31, a wiper arm 32, a drive device 33, a mechanism 34 and an aperture 35. The wiper 31 is connected to the drive device 33 by means of the wiper arm 32 in such a way that the wiper 31 about the axis 331 of the Antriebseinrich device 32 is rotatable. Here, the wiper 31 is pivoted about the axis 331 in a certain pivoting movement. The axis 331 of the drive device 32 is arranged perpendicularly to the plane of the drawing in FIGS. 2 to 7. If necessary, another axis can be selected as the fulcrum, but the arrangement shown offers the most compact design.

When the wiper arm 32 and thus the wiper 31 are rotated about the axis 331 of the drive device 33, the wiper arm 32 and thus the wiper 31 are guided with the mechanism 34. The Mechanism 34 has a linear guide 341, a link guide 342, and a coupling element 343. The coupling element 343 engages both in the linear guide 341 and in the link guide 342. The coupling element 343 is also coupled to the wiper arm 32. The link guide 342 has a curved path. The link guide 342 need not be designed as a mechanical link track. Instead, the link guide 342 may at least partially be impressed on the wiper arm 31 and thus on the wiper 31 as a predetermined movement. This can be done electrically, pneumatically, etc. In this case, the coupling element 343 can be omitted or is adapted to the design of the link guide 342.

The wiper arm 32 can be attached to the drive device 33 by a fixed or detachable screw connection and / or by a click and / or clip and / or snap connection.

The wiper system 30 moves or swivels the wiper 31 eccentrically during operation in order to maximize the wiping field 243 on the window 24. For this purpose, the wiper 31 with the wiper arm 32 is moved from a rest position 40 under the sun visor 26, which is shown in FIG. 2, to a first end position 41, in which the free end of the wiper 31 on the edge of the pane 24 or rests against the window frame 241. The wiper 31 is then leads up to its second end position 4N, which is illustrated in FIG. 7 and is mirrored to the first end position 41 at the edge of the pane 24 or at the pane ben frame 241.

When the wiper arm 32 and thus the wiper 31 move, the wiper arm 32 is guided in the link guide 342 via the disk 24 between the end positions 41, 4N. Thereafter, the wiper 31 can be reversed with the wiper arm 32 tion, again guided in the link guide 342, are guided from its second end position 4N via the disk 24 to its first end position 41. Will the wiper system

30 switched off, the wiper 31 with the wiper arm 32 returns to the rest position 40 under the sun visor 26. It goes without saying that the rest position 40 need not be arranged on the right side of the disk 24. Instead, the rest position 40 can be arranged on the left side of the disc 24, so that the movement sequence described above runs in the opposite direction over the disc 24 as shown in FIGS. 2 to 7 and described above.

The wiper system 30 thus makes it possible for the wiper 31 not to be moved back into the completely constant rest position or rest position 40 during the operation of the wiper system 30. Instead, the wiper 31 is moved in an oscillating manner in the work area and only moves outside the field of view 242 when it is switched off to the rest position or rest position 40. This enables a time-optimized availability of the wiper system 30 and a time-optimized operation of the wiper

31 of the wiper system 30.

In the example from FIGS. 2 to 8, the wiper system 30 is connected to the driver's cab 20 via the window 24. Depending on requirements, for example in the case of a passenger car or another vehicle 1, it is alternatively possible to connect the wiper system 30 at the bottom of the pane 24. This is useful if there is not enough space at the top of the vehicle 1 for the wiper system 30 without restricting the field of vision 242. In all cases, the wiper system 30 is preferably arranged on or near the disk 24 such that the aerodynamic influence of the wiper system 30 is as small as possible. In addition to the wiper 31, the wiper system 30 has only one wiper arm 32, the drive device 33 with the mechanism 34, which is designed in particular as a servomotor, and the diaphragm 35. The drive device 33 or the servomotor can be arranged directly on the wiper arm 32. The drive device 33 can drive the wiper arm 32 and thus the wiper 31 in such a way that the wiper 31 stops at any position on the disk 24 after movement from the first end position 41, for example at one of the positions 41 to 47 or any other Position on the disc 24.

Fig. 8 shows the mechanism 34 in more detail, which is coupled to the Wi shear arm 32. The wiper arm 32 can be varied in length in the longitudinal direction, in particular telescopically. Here, the wiper arm 32 has a carrier 321 on which a carriage 322 can travel back and forth. The wiper 31 can be fastened at one end to the end of the carriage 322, which projects from the wiper arm 32 in the direction of the wiper 31.

The coupling element 343 of the mechanism 34 is embodied at one end as a gear 343A, as also illustrated in greater detail in FIG. 9. The gear 343A is so arranged on the mechanism 34 of FIG. 8 that it engages on one side in a corresponding toothing 3411 of the linear guide 341. On its other side, the gear 343A engages in a corresponding toothing 3221 of the carriage 322. As a result, the movement of coupling element 343 and linear guide 341 is positively coupled to one another. In addition, the movement of coupling element 343 and carriage 322 is rela tively coupled to each other. In addition, the coupling element 343 engages with its other end in the link guide 342. For this purpose, the coupling element 343 is designed with its other end as a sliding block 343B, each with a roller 3431, 3432, 3433 at its corners, as shown in FIG. 9 more visible. One of the rollers at the four corners of the Nu ^¬ stone is in Fig. 9 is not visible. The sliding block 343B has concave wall surfaces, so that the sliding block 343B can move, in particular slide, without collisions in the link guide 342.

Thus, driving the axis 331 of Antriebseinrich device 33 causes both a rotational movement or pivoting movement of the wiper arm 32 and the wiper 31 about the drive axis or axis 331 and a movement of the coupling element 343 along the link guide 342 and the linear guide 341, thereby a Extend or retract in the longitudinal direction of the Wi arm 32 and thus the wiper 31 is effected. As a result, the length of the wiper arm 32 is varied. Here, the type of movement is pre-determined by the shape of the link guide 342. In the example described here, the link guide 342 is designed as an eccentric track, in particular dovetail-shaped. However, it is of course possible to design the link guide 342 in a different shape. As a result, the movement of the wiper 31 over the window 24 can be adapted to the wiping area 243 desired for the window 24 as required.

As a result, the wiper 31 executes a predetermined pivoting movement of a linear motion overlaid with the curved path via the disk 24.

As already mentioned, the wiper 31 is coupled to the very flat wiper arm 32 which sits on the window 24. For this purpose, the wiper 31 is designed as a flat wiper element, as shown in FIGS. 10 to 12. The Wi shear element can also be referred to as a Fiat blade and is described in more detail below. FIGS. 10 and 11 show the wiper 31 from above or from the side which faces away from the window 24 when the wiper 31 is in operation. 11 shows only a partial view of the wiper 31. FIG. 12 shows the wiper 31 from below or from the side which is facing the window 24 during operation of the wiper 31.

10 to 12, the wiper 31 has a body 310, on which two wiper lips 311, 312 are formed, and in which a channel 313 is provided. The body 310 also has fastening devices 314, which in the example of FIG. 9 are designed as through holes. The fastening devices 314 are provided for fastening the wiper 31 with a suitable fastening element on the wiper arm 32, in particular the carriage 322. In addition, the body 310 has a recess 315 in which a parabolic spring 316 is received. The parabolic spring 316 is designed such that the body 310 is biased along its length.

Thus, the wiper 31 is attached to the wiper arm 32 only at one end, namely at the end with the fastening devices 314, which is closer to the pivot point or pivot point about the axis of the drive device 33 than the free end of the wiper 31. The second The end of the wiper 31 lies freely against the pane 24 when it is mounted on the pane 24. The parabolic spring 316 is designed in such a way that the wiper 31, even at a speed of the vehicle of 100 km / h or more along its entire length with the tips 311A, 312A of the wiper lips 311, 312, bears sufficiently against the disk 24 that a flawless wiping field 243 is achieved. Therefore, the spring constant of the parabolic spring 316 is chosen over its length in such a way that the wiper 31 is biased more at its free end than at its other end. The wiper lips 311, 312 together form a double wiper lip pe. The wiper lips 311, 312 have an arrow-shaped cross section. The wiper lip 311 has a tip 311A, a first oblique side 311B and a second oblique side 311C. The wiper lip 312 has a tip 312A, a first oblique side 312B and a second oblique side 312C.

If the wiper 31 is moved to the left in FIG. 11 over the disk 24, the wiper lips 311, 312 tilt from the position shown in FIG. 11 such that the tips 311A, 312A and at least part of the first inclined sides 311B, 312B lies against the disc. If the wiper 31 is moved to the right in FIG. 11 over the disk 24, the wiper lips 311, 312 tilt from the position shown in FIG. 11 such that the tips 311A, 312A and at least part of the second oblique sides

311C, 312C abuts the disc 24.

Between the wiper lips 311, 312, a channel 313 is at least provided in the body 310 min, through which a wiping fluid, for example water and / or a cleaning agent, can be passed. If only one channel 313 is present, the channel 313 in particular has an oval or rectangular cross section such that the side of the wiper 31 facing the window 24 is longer than the side of the wiper 31 approximately perpendicular to the window 24. As a result, the wiper 31 can lie flat on the pane 24 than in the case of a round or square channel. This principle applies equally if more than one channel 313 is provided.

The channel 313 is perforated on the side which is arranged between the wiper lips 311, 312 and which is the wiper lips

311, 312 connects. This allows the wiping fluid between the

Wiper lips 311, 312 emerge from at least one opening or nozzle from the channel 313, as best shown in FIG. 10 represents. The wiping fluid preferably comes from a plurality of nozzles arranged adjacent to the wiping lips 311, 312 in order to distribute the wiping fluid as evenly as possible on the disk 24 in a fluid film. The nozzles are arranged as desired between the wiper lips 311, 312. It is preferably taken into account in the arrangement of the nozzles that, during operation of the wiper system 30, the wiping fluid due to the centrifugal force, which acts by pivoting the wiper 31 over the disk 24, from the attachment point of the wiper arm 31 on the disk 24 to the free end of the wiper 31 is pressed. Here, the centrifugal force is different, depending on whether the Wi shear 31 is moved in intervals with pauses between two wiping cycles or in continuous operation without pauses between two wiping cycles. Here, a wiping cycle includes moving the wiper 31 from position 41 to 4N and back. So with preferably the number of nozzles decreases in the direction of the free end of the wiper 31. Alternatively or additionally, the distance between the nozzles increases in the direction of the free end of the wiper 31. In particular, the nozzles are arranged between the wiper lips 311, 312 in at least one row. More than one row of nozzles can be arranged such that the nozzles are arranged in a plane both horizontally and vertically in straight rows.

Instead, the more than one row of nozzles may be arranged such that a horizontal row of nozzles is vertically offset from the next horizontal row of nozzles. In addition, the nozzles can have different distances from one another in the at least one row.

An advantage of the double wiper lips or wiper lips 311, 312 is that the wiper fluid can be introduced between them, so that the wiper field 243, even if one of the wiper lips 311, 312 is worn, is even cleaner than when only one of the wiper lips is used 311, 312 is wiped. The wiper 31 is a single component manufactured in a multi-component construction 13. In addition, the pa rabelfeder 316 is integrated in the multi-component design in the wiper 31. The Wi scher 31 has a comparatively very low overall height. This primarily results in aerodynamic advantages. Here are a reinforcing structure (glass fiber reinforced plastic, (GRP), carbon fiber) for the wiper arm 32 and the wiper 31 made of rubber or a rubber-like material positively and / or materially, in particular by adhesive bonded together.

The multi-component design enables wiper lips 311, 312 that are soft enough to fit perfectly on the pane 24, but are hard enough at the edges to be able to remove stubborn dirt. In particular, with the wiper lips 311, 312, insects can be easily wiped off the disk 24. In addition, snow can easily be wiped off the window 24. In addition, the wiper system 30 is very sensitive to frost since it has few mechanical components.

The parabolic spring 316 is inserted into the recess 315 of the wiper 31 in such a way that with the wiper 31 mounted on the wiper system 30, a sufficient pressure P can be exerted on the disc 24 at all points of the wiper lips 311, 312. In particular, the tips 311A, 312B of the wiper lips 311, 312 rest against the window 24 along the length of the wiper 31. The parabolic spring 316 acts together with the wiper arm 32 with such a high pressure P on the wiper 31 that each of the wiper lips 311, 312 can slide over the window 24. Here, the wiper lips 311, 312 are tilted against the wiping direction to the rear, as described above. When changing the direction of the wiper 31, as described above, each of the wiper lips 311, 312 must tip over, however, so that the respective wiper lip 311, 312 can cleanly slide over the pane 24. If the pressure P is too high, the respective wiping tip lip 311, 312 does not turn around when changing direction, which leads to both an undesirable noise and an unclean wiping pattern.

This pressure P exerted by the parabolic spring 316 depends on the geometry and material of the wiper lips 311, 312. The pressure P in passenger cars (cars) when the passenger car is at a standstill, in particular in the range from 7N to 18N. As the driving speed of the passenger car increases, the wiper 31 is pressed more strongly against the windshield 24 by the driving wind. The wiper system 30 is designed and constructed such that the wiper 31 exerts this pressure P on the disc 24 via the parabolic spring 316.

Unloaded, the wiper 31 with the wiper arm 32 has a strong curvature. If the wiper 31 is then pressed onto the disk 24, the contact pressure P would consequently rise first at the outermost contact point on the disk 24, that is to say the free end of the wiper 31. Therefore, the parabolic spring 316 is of variable profile width and / or profile thickness equipped to allow a more even force distribution or distribution of the pressure P along the length of the wiper 31. Parabolic spring 316 is widest at the end of wiper 21 where wiper 31 is attached to wiper arm 32. The parabolic spring 316 becomes narrower towards the other end of the wiper 31, as illustrated in FIGS. 10 and 11. The parabolic spring 316 thus has a trapezoidal shape with respect to its width over its length.

It is also typical for a parabolic spring 316 with respect to its thickness or the cross section of the spring or parabolic spring 316. With a smaller cross section, the spring force of the spring 316 is smaller than with a larger cross section of the spring 316 parabolic change in the cross section of the spring 316 a uniform force curve Achievable over the entire length of the wiper 31. In such a case, the parabolic spring 316 has a trapezoidal shape with respect to its cross section over its length. The length and cross-section as well as their trapezoidal shape can be selected depending on the existing circumstances.

If the parabolic spring 316 is not made of metal but at least partially of carbon fiber composite or other materials, the weight of the combination of wiper 31 and wiper arm 32 can be reduced. In this case, it is conceivable to partially manufacture the mechanism 34 from plastic, since lower forces occur. As a result, the mechanism 34 can be manufactured significantly more economically. A lighter wiper arm 32 therefore has advantages with respect to the mechanism 34.

The wiper system 30 is thus designed in such a way that it is possible to keep the field of vision clear in accordance with applicable standards for vehicles 1, in particular the ECE-125-R. Here, the wiper system 30 ensures functionality and cleaning ability up to a speed of 100 km / h, especially in Central European weather. In addition, the cleaning system can remove dirt, in particular insects, etc., from the pane 24.

Overall, the wiper system 30 is made very light due to its construction with few components. In addition, the wiper system 30 is therefore very inexpensive to manufacture and maintain. Here, the wiper system 30 is very error-prone, since the mechanism 34 is the only complex factor, but the mechanism 34 can largely be hidden. As a result, the mechanism 34, and thus the wiper system 30, is not very susceptible to foreign bodies. In addition, the aerodynamic influence of the wiper system 30 during operation of the vehicle 1 is very low. FIG. 13 shows a wiper 31A which can be used in a wiper system 30A according to a second exemplary embodiment instead of a wiper 31 according to the first exemplary embodiment. In contrast to the wiper 31, a structure with the function of the parabolic spring 316 of the previous exemplary embodiment is integrated in the wiper 31A. In this case, the wiper 31A is shaped accordingly to enable a more even distribution of force along the length of the wiper 31. The parabolic spring 316 is cast into the wiper 31. Thus, there is a one-piece composite, which has no connections on the outside, where foreign substances such as liquid or dirt, etc., can easily settle. Instead, there is a surface on which foreign substances, such as liquid or dirt, etc., can accumulate as little as possible.

Otherwise, the wiper system 30 or the wiper 31A according to the present exemplary embodiment is constructed in the same way as described above for the wiper system 30 according to the first exemplary embodiment.

14 shows a wiper 31B which can be used in a wiper system 30B according to a second exemplary embodiment instead of a wiper 31, 31A according to the preceding exemplary embodiments. In contrast to the wiper systems 30, 30A, there is no wiper arm 32 which can be varied in length in the present wiper system 31B. Accordingly, the wiper 31B is coupled directly to a coupling unit 36 with the drive device 33. Here, the wiper 31B can be configured, for example, as one of the wipers 31, 31A. In addition, the wiper 31B is optionally equipped with more than two wiper lips 311, 312, even if the wiper lips 311, 312 are not shown in FIG. 14. Otherwise, the wiper system 30B according to the present exemplary embodiment is constructed in the same manner as previously described for the wiper system 30 according to the first exemplary embodiment or the wiper system 30A according to the second exemplary embodiment.

The wiper systems 30, 30A, 30B described above thus have, in all configurations, a self-supporting double wiper lip or wiper lip 311, 312 including reinforcing structure and attachment to only one end face or edge side of the wiper 31, 31A, 31B. Thus, a central contact point of a wiper 31, 31A, 31B, as is used in the prior art when using a linkage, is not required. However, a variable projection of the wiper length for optimizing the wiping area 243 of the vehicle window 24 is possible.

All previously described configurations of the vehicle 1 and the wiper system 30, 30A, 30B can be used individually or in all possible combinations. In particular, any combination or exchange of the features of the exemplary embodiments is possible. If necessary, features of the exemplary embodiments can also be omitted insofar as the functions described are guaranteed. In addition, the following modifications are particularly conceivable.

The parts shown in the figures are schematically Darge presents and may vary in shape from the shapes shown in the figures, as long as their previously described functions are guaranteed.

The wiper 31, 31A may have seen a changing cross-section and / or a change in the mass and / or volume of the wiper 31, 31A along the length of the wiper 31, 31A - from the point of attachment to the wiper arm 32 (large cross-sectional area and / or mass) to the outside (small Cross-sectional area and / or mass). This is particularly a tapered, z. B. smaller cross-sectional area to the outermost point of the wiper 31, 31A possible. In this way too, the contact pressure P can be adjusted to the same value along the length of the wiper 31A on the disk 24.

In another modification of the wiper 31, 31A, the

Wiper 31, 31A provided a change in material properties along the length of wiper 31A. For example, a constant linear frame line of reinforcement structures of the wiper 31, 31A by means of material recesses, variable bores in the reinforcement structure for targeted weakening or adjustment of the component properties in the middle and in particular in the outer areas of the max. Wiper 31, 31A can be unloaded. In this way too, the contact pressure P can be adjusted to the same value along the length of the wiper 31A on the disk 24.

Instead of a double wiper lip or wiper lip 311, 312, it is alternatively possible to equip the wiper 31, 31A with a single wiper lip only. Here, too, it is possible, if desired, to provide at least one wash water nozzle on the wiper 31, 31A for targeted application of the windshield wiper water close to the wiper lip.

The wiper arm 32 is, for example, completely or at least partially made of metal, in particular steel, titanium, etc. At least partially, the wiper 31 can be made of plastic, in particular a fiber-reinforced plastic

his .

In addition, it is advantageous to use the wiper 31, 31A and / or the wiper arm 32 with aerodynamic properties of the surface / To design the outer contour of the outer surface. As a result, the wiping properties of the wiping system 30 can be further improved.

As previously mentioned, the link guide 342 need not be designed as a mechanical link track. As an alternative or in addition to a positive specification of the deflection of the wiper length in the longitudinal direction from the connection point on the vehicle 1 with the aid of the link guide 342 and the coupling element 343, a variable wiper length movement by electrical means can be achieved in order to achieve an optimal need-based wiping field 243 and thus the field of vision 242 and / or pneumatic design are impressed. The wiper length movement is preferably carried out smoothly. Here, the lengthwise variable wiper arm 32 can be configured as desired, for example as at least one of the following designs or combinations thereof, namely as a spring-mass damper system, as a system with a pneumatic spring, as electro-mechanical system with a threaded rod, which can be driven in a rotary motion by an electric motor, in particular Servomo tor, as electro

Mechanical system with a rack and / or chain, which can be driven by an electric motor, in particular a servo motor, in a linear motion, as a toothed slot.

REFERENCE SIGN LIST

vehicle

document

0 chassis frame

1 front wheels

2 rear wheels

3 bumper

5 wing

0 cab

1 interior

2 vehicle door

3 A pillar

4 disc

5 floor

6 sun visor

0, 30A, 30B wiper system

1, 31A, 31B wipers

2 wiper arm

3 drive device

4 mechanics

5 aperture

0 Rest position / rest position

1 first end position

2-47 position

N second end position

41 frame / pane frame

42 field of view

43 Wischfeld

10 bodies

11, 312 wiper lip / double wiper lip 11A, 312A tip

11B, 312B first oblique side

11C, 312C second oblique side

13 channel

14 fastening devices 315 recess

316 parabolic spring

322 sledges

331 axis / drive axis 341 linear guide

342 scenery guide

343 coupling element

343A gear

343B sliding block

3221 gearing

3411 gearing

3431-3433 rolls

3435 side surface

Claims

PATENT CLAIMS

1. wiper (31; 31A, 31B) for a wiper system (30; 30A; 30B) for wiping a window (24) of a vehicle (1), with a body (310) that has at least one wiper lip along its length (311 , 312), wherein the body (310) is designed to be attachable to an end on a wiper arm (32) of the wiper system (30; 30A; 30B) and freely at its other end with the at least one wiper lip (311, 312) the disc (24) abuts when the wiper (31; 31A, 31B) with the wiper system (30; 30A; 30B) is mounted on the disc (24), and a parabolic spring (316) which holds the wiper arm (32) with the wiper (31) received thereon with a predetermined pre-tension so that the wiper (31; 31A, 31B) lies along the entire length with the at least one wiper lip (311, 312) on the disc (24) when the wiper (31; 31A, 31B) with the wiper system (30; 30A; 30B) on the disc (24).

2. Wiper (31; 31A, 31B) according to claim 1, wherein the wiper (31) is designed as a multi-component component with the parabolic spring (316), which exerts pressure on wiper lips (311, 312) of the wiper (31) along the length of the Wischers (31) evenly distributed.

3. wiper (31; 31A, 31B) according to claim 1 or 2, wherein the parabolic spring (316) a changing over the length of the wiper (31; 31A) and / or changing over the length of the wiper (31; 31A ) changing cross-section.

4. Wiper (31; 31A, 31B) according to one of the preceding claims, wherein the parabolic spring (316) is made from metal and / or from fiber-reinforced plastic.

5. wiper (31; 31A, 31B) according to one of the preceding claims, wherein the wiper (31) has two wiper lips (311, 312), between which a channel (313) for introducing wiping fluid between the wiper lips (311, 312 ) is arranged.

6. Wiper system (30) for a window (24) of a vehicle

(1), with a wiper arm (32) for releasably receiving a wiper (31) for wiping the window (24), a drive device (33) for driving the wiper arm (32) in a movement about an axis (331) , wherein the wiper (31) has a parabolic spring (316) which biases the wiper arm (32) with the wiper (31) received thereon with a predetermined preload so that the wiper (31; 31A, 31B) along its entire length with the at least one wiper lip (311, 312) on the window (24) when the wiper (31; 31A, 31B) with the wiper system (30; 30A; 30B) is mounted on the window (24).

7. wiper system (30) according to claim 6, with a mechanism (34) for generating a predetermined pivoting movement of the wiper (31) about the axis (331), the mechanism (34) comprising:

a linear guide (341) for guiding the wiper (31) during a translational movement due to an extension or retraction of the telescopic wiper arm (32),

a link guide (342) for guiding the wiper arm (32) along an eccentric path relative to the axis (331), and

a coupling element (343) for mechanically coupling the line arführung (341) and the link guide (342), so that the Wi shearer (31) from the drive device (33) in the vorbe certain pivoting motion to a linear motion overlaid with the curved path the disc (24) is driven ben.

8. wiper system (30) according to claim 6 or 7, wherein the Wi shear arm 32 a longitudinally variable in length wi- is low-shear (32), and / or wherein the link guide (342) is dovetail-shaped.

9. wiper system (30) according to any one of claims 6 to 8, wherein the coupling element (343) is designed at one end as a gear (343A) and at its other end as a sliding block (343B) with rollers (3431 to 3433) is.

10. Wiper system (30) according to one of claims 6 to 9, wherein the sliding block (343B) between the rollers (3431 to 3433) has concave side surfaces (3435).

11. Wiper system (30) according to one of claimsö to 10, wherein the drive device (33) is a servo motor.

12. Vehicle (1), with a cab (20), a chassis frame (10), and at least one wiper system (30; 30A; 30B) according to one of the preceding claims.

13. Vehicle (1) according to claim 12, wherein the vehicle (1) is a truck or a bus or an agricultural machine or a rail vehicle, and / or wherein the at least one Wi shear system (30; 30A; 30B) under a sun visor of the driver stuff (1) is arranged.

14. Vehicle (1) according to claim 12 or 13, wherein the at least one wiper system (30; 30A; 30B) is arranged above a window (24) of the vehicle (1) or below a window (24) of the vehicle (1) .