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Patent Searching and Data


Title:
HEATING ARRANGEMENT FOR WIPER SYSTEMS IN VEHICLES, AND WIPER SYSTEM
Document Type and Number:
WIPO Patent Application WO/2017/202612
Kind Code:
A1
Abstract:
The invention relates to a heating arrangement (10) for wiper systems (100) in vehicles, with connecting leads (16; 16a; 16b, 17; 17a; 17b), which are able to be connected to a voltage source (15), wherein the connecting leads (16; 16a; 16b, 17; 17a; 17b) are connected with an electrically and thermally conducting element (21; 21a to 21d) forming a first heating element (20; 20a to 20d). Provision is made according to the invention for the connecting leads (16; 16a; 16b, 17; 17a; 17b), to be additionally connected a second heating element (26).

Inventors:
SCHAEUBLE MICHAEL (DE)
OEHLER GERHARD (DE)
Application Number:
EP2017/061191
Publication Date:
November 30, 2017
Filing Date:
May 10, 2017
Export Citation:
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Assignee:
VALEO SYSTÈMES D'ESSUYAGE (FR)
International Classes:
B60S1/38; H05B3/84
Domestic Patent References:
WO2013056821A12013-04-25
WO2012150166A12012-11-08
Foreign References:
US20080000039A12008-01-03
US20130219647A12013-08-29
US5327614A1994-07-12
DE102014018372A12015-06-18
US20120291216A12012-11-22
US20130157489A12013-06-20
EP2626257A22013-08-14
US5065471A1991-11-19
US20110185531A12011-08-04
Attorney, Agent or Firm:
VINCENT, Catherine (8 Rue Louis LormandCS 90581 LA VERRIERE, LE MESNIL SAINT DENIS, FR)
Download PDF:
Claims:
Claims

1 . A heating arrangement (10) for wiper systems (100) in vehicles, with connecting leads (1 6; 1 6a; 1 6b, 17; 17a; 17b) which are able to be connected to a voltage source (15), wherein the connecting leads (1 6; 1 6a; 16b, 17; 17a; 17b) are connected with an electrically and thermally conducting element (21 ; 21 a to 21 d) forming a first heating element (20; 20a to 20d),

characterized in that

the connecting leads (1 6; 1 6a; 1 6b, 17; 17a; 17b) are additionally connected to a second heating element (26).

2. The heating arrangement according to Claim 1 ,

characterized in that

the electrically and thermally conducting element (21 ; 21 a to 21 d) contains at least nanotubes made of carbon.

3. The heating arrangement according to Claim 1 or 2,

characterized in that

the first heating element (20; 20a to 20d) is arranged in operative connection with at least one hose line (1 1 ; 1 1 b; 1 1 c, 12; 12b; 12c) for a washing fluid.

4. The heating arrangement according to Claim 3,

characterized in that

the first heating element (20b; 20c) is arranged at a distance (a) to the at least one hose line (1 1 b; 1 1 c, 12b; 12c).

5. The heating arrangement according to Claim 3 or 4, characterized in that

the electrically and thermally conducting element (21 c) is arranged in a cavity (33) of a casing (32) surrounding several hose lines (1 1 c, 12c).

6. The heating arrangement according to one of Claims 3 to 5,

characterized in that

the electrically and thermally conducting element (21 b; 21 c) is arranged between several hose lines (1 1 b; 1 1 c, 12b; 12c) and preferably has the same distance (a) to the hose lines (1 1 b; 1 1 c, 12b; 12c).

7. The heating arrangement according to Claim 3,

characterized in that

the electrically and thermally conducting element (21 ) forms at least a partial section of the at least one hose line (1 1 , 12).

8. The heating arrangement according to one of Claims 1 to 7,

characterized in that

the electrically and thermally conducting element (21 ) is surrounded at least in certain areas by an electrically non-conducting insulation layer (27).

9. The heating arrangement according to one of Claims 1 to 8,

characterized in that

the second heating element (26) is constructed to heat a wiper blade (1 )-

10. The heating arrangement according to Claim 9,

characterized in that

the second heating element (26) is an electrically conducting foil (25), which is connected with the wiper blade (1 ) in the region of a strip- shaped carrier element (3, 4).

1 1 . A wiper system (100) with a heating arrangement (10) according to one of Claims 1 to 10.

Description:
Heating arrangement for wiper systems in vehicles, and wiper system

Prior art

The invention relates to a heating arrangement for wiper systems in vehicles according to the preamble of Claim 1 . The invention further relates to a wiper system with a heating arrangement according to the invention.

DE 10 2014 018 372 A1 discloses a heating arrangement according to the preamble of Claim 1 . Provision is particularly made in said document for a fluid line to be coated with an electrically conductive varnish, which for example contains carbon black, graphite, carbon nanotubes or similar conductive particles, and for the electrically conductive varnish to be connected to the two poles of a (DC) voltage source. Such a heating arrangement thus brings about the heating of the fluid line which serves to deliver a washing fluid to spray openings arranged for example in the region of a wiper blade. In particular, a heating arrangement of this type makes it possible to prevent freezing of the washing fluid in the fluid line at low temperatures.

Furthermore, WO 2013/056821 A1 has disclosed a heating arrangement for wiper systems in vehicles according to the preamble of Claim 1 in which a heating element, which comprises at least carbon nanotubes and is connected to a voltage source, is arranged in the region of a wiper rubber of a wiper blade. In summary, the known heating arrangements thus have only a single electrically and thermally conducting element. Disclosure of the invention Taking the prior art illustrated as the starting point, the object on which the invention is based is to develop a heating arrangement for wiper systems in vehicles according to the preamble of Claim 1 in such a way that an additional functionality of the heating arrangement can be achieved with minimum outlay in terms of equipment.

This object is achieved in the case of a heating arrangement for wiper systems in vehicles having the features of Claim 1 .

The idea on which the invention is based is to additionally connect one and the same voltage source or the connecting leads thereof to a second heating element and to arrange this second heating element in a region of the wiper system which is not arranged in operative connection with the first electrically and thermally conducting heating element. Advantageous developments of the heating arrangement according to the invention for wiper systems in vehicles are listed in the subclaims. All combinations of at least two of the features disclosed in the claims, the description and/or the figures fall within the scope of the invention. It is particularly preferred if the electrically and thermally conducting element contains at least nanotubes made of plastic. Such an embodiment makes it possible in a particularly simple manner to arrange the (heating) element in operative connection with a hose line for a washing fluid. Alternatively, it is also conceivable for the (heating) element to comprise carbon particles (carbon black) or the like, for example. In order to make it possible that the electrically and thermally conducting element can simultaneously heat several hose lines which are required for example in the case of wiper blades in which both longitudinal sides have arranged thereon respective spray nozzles for the washing fluid so that these can be controlled in dependence on the movement or wiping direction of the wiper blade, provision is made for the first heating element or the thermally conducting element to be arranged at a distance to the at least one hose line. There thus occurs heat transfer by radiant heat from the thermally conducting element in the direction of the hose line. Moreover, this design makes it possible to be able to use hose lines known per se for the washing fluid.

In order, on the one hand, to avoid undesired radiation by the electrically and thermally conducting element in directions in which no hose line for the washing fluid is arranged and, moreover, to make possible particularly protected mounting of the electrically and thermally conducting element, provision can be made for the thermally conducting element to be arranged in a cavity of a casing surrounding the several hose lines. Such an embodiment furthermore makes it possible for the (heating) element to be installed in a particularly well-protected manner with respect to mechanical forces and media without the (heating) element itself having to be specially designed or provided with a protection.

To obtain uniform heating in the case of several hose lines, the electrically and thermally conducting (heating) element is arranged between the several hose lines preferably at the same distance to the hose lines.

In a further advantageous embodiment of the invention, the electrically and thermally conducting element forms at least a partial section of the at least one hose line. In this case, particularly good heat transfer is made possible, since radiant heat does not first have to penetrate the material of the hose line from outside, but instead the electrically or thermally conducting material is already present in the hose line in direct contact with the washing fluid. In order to avoid electrical short circuits on the electrically and thermally conducting element through contact with metallic surfaces or the like, it is moreover advantageous if the electrically and thermally conducting element is surrounded at least in certain areas by an electrically nonconducting insulation layer.

What is particularly critical in terms of the functionality at low temperatures is not only the hose line which channels the washing fluid but also the wiper blade, which is to be prevented from adhering to or freezing on a windscreen. Therefore, in a preferred embodiment of the second heating element, provision is made for the latter to be designed to heat a wiper blade. In particular, the second heating element can be an electrically conducting foil, which is connected with the wiper blade in the region of a strip-shaped (metallic) carrier element. The invention also comprises a wiper system using a heating arrangement according to the invention described thus far. The wiper system has the same advantages as have been explained within the context of the heating arrangement. Further advantages, features and details of the invention will become apparent from the description hereinbelow of preferred exemplary embodiments and with reference to the drawing, in which:

Figure 1 shows a simplified illustration of a wiper system for vehicles with a heating arrangement using two heating elements, Figure 2 shows a section in the plane 11-11 of Figure 1 in the region of an electrically and thermally conducting element,

Figure 3 shows the connection region of a wiper blade using a thermally and electrically conducting element in a perspective illustration, and

Figure 4 each show cross sections in the region of two hose lines for to channelling a washing fluid in connection with a thermally Figure 6 and electrically conducting element.

Identical elements or elements having the same function are provided with the same reference numerals in the figures. Figures 1 and 2 illustrate a wiper system 100 for a vehicle in highly simplified form. The wiper system 100 has a heating arrangement 10 which is designed to (electrically) heat not only two hose lines 1 1 , 12 for channelling a washing fluid but also a wiper blade 1 of the wiper system 100. For this purpose, provision is made for the heating arrangement 10 to have two electrical connecting leads 16, 17 which are connected to different poles of a (DC) voltage source 15 and which are surrounded at least in certain areas by an electrically and thermally conducting element 21 as first heating element 20. The element 21 is produced for example by an extrusion process and has two through-openings 22, 23 which are arranged parallel to one another and which at the same time form a part of the hose lines 1 1 , 12, the element 21 being formed in one piece, that is to say that the two hose lines 1 1 , 12 are connected to one another as a structural unit. For the sake of simplicity, the two hose lines 1 1 , 12 are illustrated only over a part of their length. The two hose lines 1 1 , 12 are connected, on the one hand, via a pump to a reservoir (not shown) for the washing fluid, and, on the other hand, to spray openings or spray nozzles for applying the washing fluid to a vehicle window. The two hose lines 1 1 , 12 arranged parallel to one another have an at least virtually circular cross section (Figure 2). The two connecting leads 16, 17 are arranged on mutually opposed sides of the two hose lines 1 1 , 12 and extend in a alignment with a centre plane 24 through which the centres or mid-points of the two hose lines 1 1 , 12 also extend. It is essential that the element 21 contains at least nanotubes made of carbon to form its electrical and thermal conductivity. Furthermore, the two electrical connecting leads 1 6, 17 are arranged in direct contact with the material of the element 21 or annularly surrounded thereby. As a result of the electrical connection of the two connecting leads 16, 17 to the voltage source 15, the material of the first heating element 20 or of the element 21 is heated, and the washing fluid channelled within the hose lines 1 1 , 12 in the through-openings 22, 23 is thus also heated. The element 21 is, moreover, surrounded by an electrical insulation layer 27. Moreover, it can be seen from Figure 1 that the two connecting leads 1 6, 17 are connected in an electrically conducting manner to a heating foil 25 on the wiper blade 1 , which forms a second heating element 26. The heating foil 25 is connected, on the side facing away from a wiper lip 2 of the wiper blade 1 to the upper sides of two strip-shaped carrier elements 3, 4 consisting of metal, for example by an adhesive bond or by bearing contact.

The wiper blade 1 illustrated in Figure 1 takes the form of a so-called flat wiper blade 1 , by contrast with a so-called bow wiper blade, as is also known from the prior art. The second heating device 26 heats the wiper blade 1 as a result of the electrical resistance of the two carrier elements 3, 4.

It is shown in Figure 3 that the two connecting leads 16a, 17a are surrounded by an electrically and thermally conducting element 21 a which forms the first heating element 20a. The two connecting leads 1 6a, 17a are connected to a connection plug 28 which serves, for example, to make electrical contact with the heating element 26 or the heating foil 25. In this case, the element 21 a serves for heating the wiper blade 1 in the region of connection to a wiper arm (not shown) by radiant heat.

Figure 4 illustrates the case in which the first heating element 20b or the element 21 b is formed as an element which is separate from the two hose lines 1 1 b, 12b. The two connecting leads 1 6b, 17b, together with the element 21 b, are surrounded by an electrically non-conducting insulation layer 29, the element 21 b being in the form of a strip between the two connecting leads 1 6b, 17b and being connected to the two connecting leads 1 6b, 17b. The two hose lines 1 1 b, 12b are arranged on both sides at a slight distance to the element 21 b, the two hose lines 1 1 b, 12b being heated by radiant heat, as the arrows 31 are intended to illustrate. It is also essential that the same distance a is formed in each case between the insulation layer 29 or the element 21 b and the two hose lines 1 1 b, 12b.

Figure 5 illustrates the case in which the two hose lines 1 1 c, 12c are surrounded by a common casing 32 which forms a cavity 33 in an intermediate space between the two hose lines 1 1 c, 12c, in which cavity the element 21 c or the first heating element 21 c is arranged, the design and arrangement of the element 21 c with respect to the hose lines 1 1 c, 12c corresponding to the arrangement and design of Figure 4. Finally, Figure 6 illustrates the case in which the two hose lines 1 1 d, 12d are arranged parallel to one another and are connected to one another in one piece via a central web 34. The element 21 d or the first heating element 20d is again formed as a separate element from the two hose lines 1 1 d, 12d and structurally configured in accordance with Figures 4 and 5. The two connecting leads 1 6b, 17b extend in alignment with the two hose lines 1 1 d, 12d, the element 21 d being arranged parallel to a centre plane 35 of the two hose lines 1 1 d, 12d.

The heating arrangement 10 described thus far can be amended modified in various ways without departing from the concept of invention.

List of reference siqns

1 Wiper blade

2 Wiper lip

3 Carrier element

4 Carrier element

10 Heating arrangemen

11, 11b, 11c, 11d Hose line

12, 12b, 12c, 12d Hose line

15 Voltage source

16, 16a, 16b Connecting lead

17, 17a, 17b Connecting lead

20, 20a- 20d 1 st heating element

21, 21a- 21d Element

22 Through-opening

23 Through-opening

24 Centre plane

25 Heating foil

26 2 nd heating element

27 Insulation layer

28 Connection plug

29 Insulation layer

31 Arrow

32 Casing

33 Cavity

34 Central web

35 Centre plane

100 Wiper system a Distance