CN116142138A

CN116142138A - Wiper blade device and heating element

Info

Publication number: CN116142138A
Application number: CN202211470034.8A
Authority: CN
Inventors: H·德蓬特; M·辛纳维
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2021-11-23
Filing date: 2022-11-22
Publication date: 2023-05-23
Also published as: FR3129338A1

Abstract

The invention is based on a wiper blade device (10 a;10 b) having at least one base unit (12 a;12 b), in particular a cover unit (16 a;16 b), which preferably has at least one cover element (18 a, 18a ';18b, 18 b') for covering a wiper lip (14 a;14 b). It is proposed that the wiper blade device (10 a;10 b) has at least one heating element (20 a;20 b) comprising at least one thermistor material (22 a;22 b), advantageously at least one cold conductor material (24 a;24 b).

Description

Wiper blade device and heating element

Technical Field

A wiper blade device has been proposed which has at least one base unit, in particular a cover unit, which preferably has at least one cover element for covering a wiper lip.

Disclosure of Invention

The invention is based on a wiper blade device having at least one base unit, in particular a cover unit, which preferably has at least one cover element for covering a wiper lip.

It is proposed that the wiper blade device has at least one heating element, which comprises at least one thermistor material, advantageously at least one cold conductor material.

A "wiper blade arrangement" is to be understood preferably as at least one component, preferably a subassembly, of a wiper blade, preferably a windscreen wiper. In particular, the wiper blade arrangement can also comprise the entire wiper blade. In particular, the wiper blade arrangement can also comprise the entire windscreen wiper, in particular with the wiper blade. Preferably, the wiper blade arrangement is provided for use on a vehicle. Preferably, the wiper blade arrangement is provided in particular as part of a windscreen wiper for cleaning a surface, preferably a surface of a glazing on a vehicle. Preferably, the wiper blade device is coupled to the vehicle for cleaning the vehicle window, for example by a wiper arm. The object is preferably provided for a determined function, which is understood to mean that the object fulfills and/or performs the determined function in at least one application and/or operating state. The term "operating state" is to be understood to mean a state in which the wiper blade device is ready for a wiping operation and/or is at least coupled to a wiper arm and/or a vehicle and/or is in a wiping operation in which, for example, a wiper lip of the wiper blade device, in particular of a windscreen wiper, is preferably guided past the vehicle pane and in this case advantageously bears against the vehicle pane.

The base unit may comprise at least one spring rail. Preferably, the at least one spring rail is configured as a curved spring-elastic metal rod, in particular as a metal strip. Preferably, the at least one spring rail is configured to form a reaction force against deflection upon deflection from the basic shape of the spring rail. The base unit can comprise the wiper lip. The wiper lip is configured to wipe the surface. Preferably, the wiper lip is composed of an elastomeric material. The wiper lip can be configured as part of a wiper strip unit which, for accommodating the at least one spring rail, at least partially defines at least one spring rail receptacle, in particular as a groove and/or recess. The wiper lip is preferably constructed in one piece with the wiper strip unit, in particular from the same material. By "one-piece" is understood in particular a one-piece molding, wherein the one piece is preferably produced from a single blank, material and/or cast part, particularly preferably by injection molding, in particular by single-component and/or multicomponent injection molding. The at least one spring rail is designed in particular for stabilizing the wiper lip. The base unit can comprise at least one wiper blade adapter. The wiper blade adapter is preferably designed for releasable, preferably pivotable connection with a wiper arm, in particular on a vehicle, about a pivot axis. Preferably, the pivot axis is oriented at least substantially perpendicular to a longitudinal axis of the wiper blade device, in particular of the base unit. The expression "substantially perpendicular" is intended to define in particular an orientation of a direction relative to a reference direction, wherein the direction and the reference direction enclose an angle of 90 ° when viewed in particular in the projection plane, and the angle has a maximum deviation of in particular less than 8 °, advantageously less than 5 ° and particularly advantageously less than 2 °. The base unit may comprise at least one, preferably at least two end caps. The at least one end cap is preferably configured for sealing the wiper blade device along a longitudinal axis of the wiper blade device, in particular of the base unit, at an end of the wiper blade device. The base unit preferably comprises a cover unit, which can be designed in particular as a spoiler unit. Preferably, the spoiler unit has at least one concavely curved outer surface for pressing the wiper lip onto the surface with the aid of the running wind. Preferably, the at least one concavely curved outer surface is arranged on a side of the cover unit facing away from the wiper lip. In particular, the at least one cover element can be configured as a spoiler element, which preferably has at least one concavely curved outer surface for pressing the wiper lip against the surface by means of the running wind. The cover unit, the wiper blade adapter, the at least one end cap and/or the wiper strip unit can define at least one fluid channel which extends through the cover unit, the wiper blade adapter, the end cap and/or the wiper strip unit, preferably over at least 50%, particularly preferably over at least 75%, at least substantially parallel to the longitudinal axis of the cover unit, the wiper blade adapter, the end cap and/or the wiper strip unit. The "longitudinal axis" of the object is understood to mean, in particular, an axis which runs parallel to the longest edge of a smallest geometrical cuboid which just surrounds the object completely, and preferably extends through the geometric center point of the object, in particular of the cuboid. By "substantially parallel" is understood in particular an orientation of the direction relative to a reference direction, in particular in a plane, wherein the direction has a deviation of in particular less than 8 °, advantageously less than 5 °, and particularly advantageously less than 2 °, relative to the reference direction. The cover unit, the wiper blade adapter, the at least one end cap and/or the wiper strip unit may alternatively not restrict the fluid channel. In particular, the cover unit, the wiper blade adapter, the at least one end cap and/or the wiper strip unit, except for the heating recess, cannot completely define a further cavity in a cross section perpendicular to the longitudinal axis of the cover unit, the wiper blade adapter, the end cap and/or the wiper strip unit. In particular, the wiper blade device, in particular the base unit, can be configured without elements defining at least one fluid channel. The base unit, in particular the cover unit, the spoiler unit, the wiper blade adapter, the end cap, the wiper lip and/or the wiper strip unit, is preferably composed at least in part, preferably at least in large part, in particular preferably completely, of a TPE material, in particular of a thermoplastic elastomer material. Preferably, the base unit is co-extruded.

Preferably, the thermistor material constitutes at least 50%, preferably at least 60%, particularly preferably at least 70% and very particularly preferably at least 80% of the heating element by volume. Preferably, the thermistor material is configured as a PTC thermistor material. Preferably, the at least one heating element is at least partially integrated into the base unit. Preferably, at least one heating element is arranged at least partially, preferably at least largely, particularly preferably at least 90% by volume in the base unit.

Particularly preferably, the thermistor material is configured as a cold conductor material. Preferably, the heating element has a temperature-dependent electrical resistance which varies, in particular increases exponentially, in particular exponentially, with a temperature change in a high temperature range of at least 40 ℃, preferably at least 50 ℃. Alternatively, the thermistor material may be at least partially, in particular sectionally, embodied as a heat conductor material. Preferably, the at least one heating element comprises at least two conductor cables. Preferably, at least one heating element, in particular at least two conductor cables and/or at least one thermistor material extends at least 50%, preferably at least 60%, particularly preferably at least 70% and very particularly preferably at least 80% through the base unit, preferably at least one covering element, in particular at least substantially parallel to the longitudinal axis of the base unit. Preferably, at least one thermistor material connects at least two conductor cables to each other. Preferably, the at least one thermistor material connects at least two conductor cables to each other at least over 50%, preferably at least over 60%, particularly preferably at least over 70% and very particularly preferably at least over 80% of the extension of the conductor cable parallel to the longitudinal axis of the conductor cable. Preferably, at least two conductor cables are connected at least substantially parallel to each other in orientation by at least one thermistor material.

The design according to the invention of the wiper blade device advantageously reduces the risk of overheating of the wiper blade device, in particular of the base unit, starting from the heating element. In particular, the temperature monitoring of the at least one heating element can advantageously be dispensed with. In particular, an advantageous cost-effective control for the vehicle can be achieved with respect to the heatable wiper blade.

It is furthermore proposed that the at least one heating element comprises at least one nickel-plated copper cable. Preferably, at least one of the at least two conductor cables is configured as a nickel-plated copper cable. Particularly preferably, the at least two conductor cables are each formed as nickel-plated copper cables. The at least two conductor cables may be configured as stranded wires. Advantageous electrical contact between the conductor wire and the thermistor material can be achieved.

It is furthermore proposed that the at least one heating element comprises at least one heating matrix doped with carbon. The thermistor material is preferably configured as a polymer matrix, which is mixed with carbon particles, in particular carbon black particles. A favorable temperature to resistance ratio can be achieved in a favorable temperature range.

It is furthermore proposed that the at least one base unit defines a heating recess, in particular the already mentioned heating recess, which has an elongated outer contour in a cross section perpendicular to the longitudinal axis of the at least one base unit. Preferably, the outer contour of the at least one heating recess of the at least one base unit, in particular in a cross section perpendicular to the longitudinal axis of the at least one base unit, has at least substantially an I-shape. Preferably, the outer contour of the at least one heating recess of the at least one base unit has, in particular in a cross section perpendicular to the longitudinal axis of the at least one base unit, two opposite parallel longer outer edges and two opposite shorter outer edges. Preferably, the two shorter outer edges of the outer contour are curved with the same radius. Preferably, the two curved shorter outer edges are each oriented toward the imaginary end of the pivot axis. A heating recess can be realized which can advantageously be filled with a conductor cable having a circular cross section and a thermistor material.

It is furthermore proposed that the wiper blade device is free of a temperature sensor. Preferably, the base unit is free of temperature sensors, in particular on the heating element. Preferably, the entire wiper blade is free of temperature sensors. An advantageously compact wiper blade device can be achieved. A wiper blade device which is advantageously low maintenance can be achieved.

It is furthermore proposed that the wiper blade device has at least one, in particular already mentioned, end cap with at least one electrical connector for electrically coupling the at least one heating element to a power supply line. Preferably, the at least one electrical connector is immovably connected with the at least one end cap. Preferably, the at least one electrical connector is connected on the inside with the heating element, in particular with the free ends of the at least two conductor cables, preferably the at least two conductor cables. Preferably, the at least one end cap arranged on the inner diameter of the wiper movement of the wiper blade device has the at least one electrical connector. Preferably, the electrical connector is configured for connection to the at least one power supply line on a side facing away from the wiper lip. Preferably, the at least one electrical connector is formed on the outside of the at least one wiper blade adapter as two connector pins, the longitudinal axis of which extends in particular perpendicularly to the pivot axis and perpendicularly to the longitudinal axis of the base unit. An advantageously short supply line, in particular on the wiper arm, for supplying the at least one heating element with electrical energy can be realized.

It is furthermore proposed that the wiper blade device has at least one, in particular the already mentioned wiper blade adapter for connection to the at least one covering element, which wiper blade adapter has at least one electrical connector for electrically coupling the at least one heating element to a supply line. Preferably, the at least one electrical connector is immovably connected with the at least one wiper blade adapter. Preferably, the at least one electrical connector is connected on the inside with the heating element, in particular with the free ends of the at least two conductor cables, preferably the at least two conductor cables. Preferably, the at least one wiper blade adapter has at least one adapter base body and at least one retaining spring, which are provided for being connected to one another in a pivotable manner about a pivot axis. Preferably, the electrical connector is configured for connection to the at least one power supply line on a side facing away from the wiper lip. Preferably, the at least one electrical connector is formed on the outside of the at least one wiper blade adapter as two connector pins, the longitudinal axis of which extends in particular perpendicularly to the pivot axis and perpendicularly to the longitudinal axis of the base unit. An advantageously slip-preventing electrical connection of the wiper blade device can be achieved.

It is furthermore proposed that the wiper blade device has at least one further heating element, which comprises at least one thermistor material, advantageously at least one cold conductor material. Preferably, the cover unit has at least two cover elements, which are each designed to be connected to the wiper blade adapter on opposite sides of the wiper blade adapter. Preferably, the at least one heating element is configured for connection with at least one cover element, in particular a spoiler element. Preferably, the at least one further heating element is configured for connection with the further cover element, in particular the spoiler element. Preferably, the at least one heating element and the at least one further heating element are identically, in particular dimensionally, configured. Preferably, the at least one heating element and the at least one further heating element are composed of the same conductor wire and the same thermistor material. Preferably, the at least one heating element and the at least one further heating element are configured identically to the conductor wire and the thermistor material. Preferably, at least one heating element, in particular at least two conductor cables and/or at least one thermistor material extends at least 50%, preferably at least 60%, particularly preferably at least 70% and very particularly preferably at least 80% through the base unit, preferably at least one covering element, in particular at least substantially parallel to the longitudinal axis of the base unit. Preferably, at least one heating element, in particular at least two conductor cables and/or at least one thermistor material extends at least 75%, preferably at least 80%, particularly preferably at least 90% and very particularly preferably at least substantially completely through the base unit, preferably through one of the at least two cover elements, in particular at least substantially parallel to the longitudinal axis of the base unit. Preferably, at least one further heating element, in particular at least two conductor cables and/or at least one thermistor material extends at least 75%, preferably at least 80%, particularly preferably at least 90% and very particularly preferably at least substantially completely through the base unit, preferably through one of the at least two cover elements, in particular at least substantially parallel to the longitudinal axis of the base unit. An advantageous individual heating of the wiper blade device can be achieved on both cover elements, in particular spoiler elements.

It is furthermore proposed that the at least one end cap has at least one sealing element for closing the heating recess opening on the at least one end cap in a watertight manner. A heating element which is advantageously waterproof can be realized.

Furthermore, a heating element of a wiper blade device according to the invention is proposed. Advantageous modularity can be achieved.

Furthermore, a wiper blade system is proposed, which has at least one spring rail and has a wiper blade device according to the invention. Preferably, the entire wiper blade system is free of temperature sensors. It is possible to realize a unit which is advantageously mass-producible.

The wiper blade device according to the invention, the wiper blade system according to the invention and/or the heating element according to the invention should not be limited to the above-described applications and embodiments. In particular, the wiper blade device according to the invention, the wiper blade system according to the invention and/or the heating element according to the invention can have a number different from the number of individual elements, components and units mentioned here in order to satisfy the manner of operation described here. Furthermore, in the value ranges given in this disclosure, values lying within the boundaries should also be regarded as disclosed and arbitrarily usable.

Drawings

Other advantages result from the following description of the drawings. Two embodiments of the present invention are shown in the drawings. The figures, description and claims contain many combined features. Those skilled in the art will also appropriately consider these features alone and combine them into other combinations of interest.

Figure 1 shows a schematic view of a wiper blade system according to the invention with a wiper blade device according to the invention,

figure 2 shows a schematic cross-sectional view of a wiper blade device according to the invention,

fig. 3 shows a schematic view of a wiper blade arrangement according to the invention, as well as

Fig. 4 shows a schematic view of an alternative wiper blade arrangement according to the invention.

Detailed Description

Fig. 1 shows a wiper blade system 100a. The wiper blade system 100a is configured as a wiper blade. The wiper blade system 100a includes two spring rails (not shown). The spring rail is formed as two identically curved spring-elastic metal rods, in particular metal strips. The spring rails are each designed to form a counter force against deflection when deflected from the basic shape of the respective spring rail. The wiper blade system 100a includes a wiper blade device 10a.

The wiper blade apparatus 10a is a sub-assembly of the wiper blade system 100a. The wiper blade device 10a is provided for use on a vehicle. The wiper blade device 10a is provided for cleaning a surface of a glass on a vehicle. The wiper blade device 10a is coupled to the vehicle for cleaning the vehicle window, for example by a wiper arm 102 a.

The wiper blade device 10a has a base unit 12a.

The base unit 12a includes a wiper lip 14a. The wiper lip 14a is configured to wipe a surface. The wiper lip 14a is composed of an elastomeric material. The wiper lip 14a is configured as part of a wiper strip unit 26a, which, for accommodating the spring rail, defines two spring rail receptacles, which are configured in particular as grooves. The wiper lip 14a is constructed in one piece with the wiper strip unit 26a, in particular from the same material. The spring rail is particularly designed to stabilize the wiper lip 14a.

The base unit 12a includes a wiper blade adapter 28a. The wiper blade adapter 28a is designed for releasable pivotable connection with a wiper arm 102a, in particular on the vehicle, about a pivot axis 30 a. The pivot axis 30a is oriented perpendicular to a longitudinal axis 32a of the wiper blade device 10a, in particular of the base unit 12a. The wiper blade adapter 28a has an adapter base 34a and a retaining spring 36a, which are designed to be connected to one another in a pivotable manner about the pivot axis 30 a. The wiper blade device 10a comprises a wiper blade adapter 28a indirectly, in particular via the base unit 12a.

The base unit 12a includes a cover unit 16a. The cover unit 16a is embodied here, for example, as a spoiler unit 40a. The cover unit 16a is designed to cover the wiper lip 14a, the spring rail, the two heating elements 20a and the wiper strip unit 26a. The cover unit 16a has two

cover elements

18a, 18a'. The wiper blade adapter 28a is intended to be connected to the

covering element

18a, 18a'. The

cover element

18a, 18a' is designed for connection to the wiper blade adapter 28a on opposite sides of the wiper blade adapter 28a.

The base unit 12a includes two

end caps

46a, 46a'. The end caps 46a, 46a' are designed to seal the wiper blade device 10a, in particular the base unit 12a, along the longitudinal axis 32a of the wiper blade device 10a, in particular the longitudinal axis 38a of the base unit 12a, at the end of the wiper blade device 10a.

The spoiler unit 40a has two concavely curved

outer surfaces

42a, 42a' for pressing the wiper lip 14a onto the surfaces by means of running wind. The concavely curved

outer surface

42a, 42a' is arranged on the side of the cover unit 16a facing away from the wiper lip 14a. The concavely curved

outer surfaces

42a, 42a 'are each arranged on one of the two

cover elements

18a, 18a'. In particular, the

cover elements

18a, 18a ' are each formed as

spoiler elements

44a, 44a ' each having one of the two concavely curved

outer surfaces

42a, 42a ' for pressing the wiper lip 14a against the surface by means of the running wind.

The cover unit 16a defines two fluid passages 48a (see fig. 2). One of the fluid passages 48a in one of the spoiler elements 44a is shown in fig. 2 by way of example and representative of two. The fluid passages 48a together extend through the cover unit 16a parallel to the longitudinal axis 38a of the base unit 12a over approximately 80% of the base unit 12a.

The base unit 12a, in particular the cover unit 16a, in particular the spoiler unit 40a, is partially made of TPE material. The base unit 12a, in particular the cover unit 16a, in particular the spoiler unit 40a, is formed by coextrusion.

The wiper blade device 10a has two heating elements 20a. The wiper blade device 10a has, in particular, a heating element 20a and a further heating element 20a. One of the heating elements 20a in one of the spoiler elements 44a is shown by way of example and representative of two in fig. 2. The two

heating elements

20a, 20a' each have at least one thermistor material 22a, in particular a cold conductor material 24a. The heating element 20a has two

conductor cables

50a, 50a', respectively. A respective one of the heating elements 20a is configured for connection with one of the

cover elements

18a, 18a ', in particular the

spoiler element

44a, 44 a'.

The two heating elements 20a are identically, in particular dimensionally, configured. The two heating elements 20a are composed of the same conductor wire and the same thermistor material 22a. The two heating elements 20a are configured identically in terms of the conductor lines and the thermistor material 22a.

The two heating elements 20a, in particular the two

conductor cables

50a, 50a', together with the thermistor material 22a extend at least 80% through the base unit 12a, in particular parallel to the longitudinal axis 38a of the base unit 12a. The two heating elements 20a, in particular the two

conductor cables

50a, 50a ', and the thermistor material 22a of the heating element 20a each extend through at least 80% of one of the

cover elements

18a, 18a', in particular parallel to the longitudinal axis 38a of the base unit 12a.

The thermistor material 22a constitutes more than 80% of the heating element 20a by volume. The thermistor material 22a is configured as a PTC thermistor material 22a. The heating element 20a is largely integrated into the base unit 12a. The heating element 20a is mostly arranged in the base unit 12a.

The thermistor material 22a is configured as a cold conductor material 24a. The heating element 20a has a temperature-dependent electrical resistance which, when the temperature changes, changes exponentially, in particular increases exponentially, in the high temperature range above 60 ℃. The thermistor material 22a connects the two

conductor cables

50a, 50a' of the heating element 20a to each other.

The heating element 20a, in particular the two

conductor cables

50a, 50a 'and the thermistor material 22a extend through the base unit 12a over at least 80% of the longitudinal extension of the base unit 12a, preferably through one of the

cover elements

18a, 18a', in particular parallel to the longitudinal axis 38a of the base unit 12a. The thermistor material 22a connects the two

conductor cables

50a, 50a ' of the heating element 20a to each other parallel to the longitudinal axis 52a of the

conductor cables

50a, 50a ' over at least one extension of the

conductor cables

50a, 50a '. The two

conductor cables

50a, 50a' are connected in parallel orientation to each other by the thermistor material 22a. The two

conductor cables

50a, 50a' of each heating element 20a are configured as stranded wires. The heating element 20a has two nickel plated

copper cables

54a, 54a', respectively. All

conductor cables

50a, 50a 'are configured as nickel-plated

copper cables

54a, 54a'.

Each heating element 20a includes a heating matrix 56a doped with carbon. The thermistor material 22a is configured as a heated matrix 56a doped with carbon. The thermistor material 22a is configured as a polymer matrix that is mixed with carbon particles, in particular carbon black particles.

The base unit 12a defines two heating recesses 58a. One of the heating recesses 58a in one of the spoiler elements 44a is shown by way of example and representative of two in fig. 2. The heating recess 58a has an elongated outer contour 60a in a cross section perpendicular to the longitudinal axis 38a of the base unit 12a.

The outer contour 60a of the heating recess 58a of the base unit 12a has an approximately I-shape, in particular in a cross-section perpendicular to the longitudinal axis 38a of the base unit 12a.

The outer contour 60a of the heating recess 58a of the base unit 12a has, in particular in a cross section perpendicular to the longitudinal axis 38a of the base unit 12a, two opposite parallel longer

outer edges

62a, 62a 'and two opposite shorter

outer edges

64a, 64a'. The two shorter

outer edges

64a, 64a' of the outer contour 60a are curved with the same radius. The two curved shorter

outer edges

64a, 64a 'are each oriented toward an

imaginary end

67a, 67a' of the pivot axis 30 a.

The end caps 46a, 46a 'each have a sealing element (not shown) for closing the opening of the heating recess 58a on the

end cap

46a, 46a' watertight.

The wiper blade adapter 28a has two identical

electrical connectors

66a, 66a'.

Electrical connectors

66a, 66a' are used to electrically couple heating element 20a with the power supply line. The power supply line is arranged on the wiper arm 102 a. The

electrical connectors

66a, 66a' are immovably connected with the wiper blade adapter 28a. The

electrical connectors

66a, 66a ' are each connected on the inside to one of the heating elements 20a, in particular to the two

conductor cables

50a, 50a ' of the respective heating element 20a, preferably to the free ends of the two

conductor cables

50a, 50a ' of the respective heating element 20a. The

electrical connector

66a, 66a' is configured for connection to the power supply line on a side facing away from the wiper lip 14a.

The wiper blade device 10a has no temperature sensor. The base unit 12a is free of temperature sensors, in particular on the heating element 20a. The entire wiper blade system 100a is free of temperature sensors.

The

electrical connectors

66a, 66a 'are each formed as two

connector pins

68a, 68a' on the outside of the wiper blade adapter 28a, which extend with their

longitudinal axes

70a, 70a ', 70a ", 70 a'" in particular perpendicularly to the pivot axis 30a and perpendicularly to the longitudinal axis 38a of the base unit 12a.

Another embodiment of the present invention is shown in fig. 4. The following description and the figures are essentially limited to the differences between the embodiments, wherein reference is made in principle also to the other embodiments, in particular to the figures and/or the description of fig. 1 to 3, with respect to identically numbered components, in particular with respect to components having the same reference numerals. To distinguish between the embodiments, the letter a is provided after the reference numerals of the embodiments in fig. 1 to 3. In the embodiment of fig. 4, the letter a is replaced by the letter b.

Fig. 4 shows an alternative wiper blade arrangement 10b. The wiper blade device 10b has precisely one heating element 20b, which extends individually from one end cap 46b to the other end cap 46b' through the base unit 12a, in particular parallel to the longitudinal axis 38a of the base unit 12a, in particular through the wiper blade adapter 28b.

End cap 46b of

end caps

46b, 46b' has electrical connector 66b. The electrical connector 66b is used to electrically couple the heating element 20b with the power supply line.

The electrical connector 66b is non-movably connected with the end cap 46 b. The electrical connector 66b is connected on the inside to the heating element 20b, in particular to the free ends of the two conductor cables 50b, 50b ', preferably the two conductor cables 50b, 50 b'.

An end cap 46b with an electrical connector 66b is provided for placement on the inner diameter of the wiper motion of the wiper blade device 10b. The other end cap 46b' lacks the electrical connector 66b.

The electrical connector 66b is configured for connection to a power supply line on the side facing away from the wiper lip 14 b. On the outside of the end cap 46b, the electrical connector 66b is formed as two

connector pins

68b, 68b ', which extend with their

longitudinal axes

70b, 70b' perpendicular to the pivot axis 30b and perpendicular to the longitudinal axis 38b of the base unit 12 b.

Claims

1. Wiper blade arrangement having at least one base unit (12 a;12 b), in particular a cover unit (16 a;16 b), which preferably has at least one cover element (18 a, 18a ';18b, 18 b') for covering a wiper lip (14 a;14 b), characterized by at least one heating element (20 a;20 b) which comprises at least one thermistor material (22 a;22 b), advantageously at least one cold conductor material (24 a;24 b).

2. Wiper blade device according to claim 1, characterized in that the at least one heating element (20 a;20 b) comprises at least one nickel-plated copper cable (54 a, 54a ';54b, 54 b').

3. Wiper blade device according to claim 1 or 2, characterized in that the at least one heating element (20 a;20 b) comprises at least one heating matrix (56 a;56 b) doped with carbon.

4. Wiper blade arrangement according to one of the preceding claims, characterized in that the at least one basic unit (12 a;12 b) defines a heating recess (58 a;58 b) having an elongated outer contour (60 a;60 b) in a cross-section perpendicular to a longitudinal axis (38 a;38 b) of the at least one basic unit (12 a;12 b).

5. Wiper blade device according to one of the preceding claims, characterized in that the wiper blade device (10 a;10 b) is free of a temperature sensor.

6. Wiper blade device according to one of the preceding claims, characterized by at least one end cap (46 b) with at least one electrical connector (66 b) for electrically coupling the at least one heating element (20 b) with a supply line.

7. Wiper blade device according to one of the preceding claims, characterized by at least one wiper blade adapter (28 a) for connection with the at least one spoiler element (44 a, 44a '), which has at least one electrical connector (66 a, 66 a') for electrically coupling the at least one heating element (20 a) with a supply line.

8. Wiper blade device according to one of the preceding claims, characterized by at least one further heating element (20 a;20 b) comprising at least one thermistor material (22 a;22 b), advantageously at least one cold conductor material (24 a;24 b).

9. Wiper blade arrangement according to at least claims 4 and 6, characterized in that the at least one end cap (46 a, 46a ';46b, 46 b') has at least one sealing element for closing off the opening of the heating recess (58 a;58 b) on the at least one end cap (46 a, 46a ';46b, 46 b') in a watertight manner.

10. The heating element of a wiper blade device (10 a;10 b) according to any one of claims 1 to 9.

11. Wiper blade system having at least one spring rail and having a wiper blade device (10 a;10 b) according to any one of claims 1 to 9.