Wiper blades, especially for motor vehicles

Abstract

A wiper blade (10), in particular for a motor vehicle, is disclosed. The wiper blade comprises a wiper strip (14), a liquid channel (30, 32) for conducting a cleaning liquid, and a heating device (38). According to the invention, the heating device (38) is substantially arranged within the liquid channel (30, 32).

Description

Technical Field

[0001] The invention relates to a wiper blade, in particular for a motor vehicle. Background Art

[0002] A large number of wiper blades for motor vehicles are already known, which have a wiper strip, a fluid channel for conducting a cleaning fluid, and a heating device. Such wiper blades have a heating device, which heats the spring guide rail of the wiper blade. This is complicated and costly to manufacture. Summary of the invention

[0003] The wiper blade with the features according to the invention has the advantage that the heating device is substantially placed in the liquid channel. This is simple and cost-effective to manufacture and in addition the heat of the heating device is applied directly where the heat is needed.

[0004] Advantageous improvements and enhancements of the present invention include but are not limited to: the heating device is constructed as a coated heating wire; the heating device includes a heating wire with a plastic cover; the liquid channel has at least one opening for outputting cleaning liquid; a plurality of openings are provided, which are arranged in a distributed manner on the longitudinal extension; the liquid channel is constructed integrally with the wiper strip; the wiper strip has a wiper lip and is constructed integrally; at least one liquid channel extends in the fastener; the liquid channel has at least one opening in the fastener for outputting cleaning liquid.

[0005] It is particularly advantageous if the heating device is designed as a sheathed heating wire. Such heating wires are available at low cost and can be introduced into the liquid channel in a simple manner.

[0006] Furthermore, it is advantageous if the heating wire comprises a plastic sheathing, which is advantageously inexpensive and has the required service life.

[0007] Ideally, the liquid channel has at least one opening for discharging the cleaning liquid, thereby enabling a simple and cost-effective construction.

[0008] It is particularly advantageous here if the openings are arranged distributed over the longitudinal extension of the wiper blade, since this ensures a uniform discharge of the washer fluid along the longitudinal extension.

[0009] The fluid duct can be designed particularly simply and cost-effectively in one piece with the wiper strip.

[0010] Ideally, the wiper strip has a wiper lip and is formed integrally with the wiper lip. In this way, the wiper strip can be directly extruded or injection-molded together with the wiper lip.

[0011] In a particularly efficient and therefore advantageous design, the wiper blade has a fastening element for fastening to the wiper arm, and the heating device is guided through the fastening element. In this way, the fastening element can also be heated in a simple manner.

[0012] Ideally, the liquid channel also extends through the fastening element here.

[0013] Furthermore, it is advantageous if the liquid channel has at least one opening in the fastening element for discharging the cleaning liquid, so that the cleaning liquid can be discharged directly from the fastening element. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Various exemplary embodiments of the invention are shown in the drawings and are explained in more detail in the following description.

[0015] in:

[0016] Figure 1 A wiper blade according to the invention is shown in a schematic side view,

[0017] Figure 2 A schematic diagram shows a transverse section through a wiper strip of a wiper blade according to the invention, and

[0018] Figure 3 A central section of a wiper blade is shown in a schematic side view. DETAILED DESCRIPTION

[0019] exist Figure 1 1 shows a wiper blade 10 according to the invention in a schematic side view. The wiper blade 10 according to the invention comprises a spring rail 12 which is made of strip steel and is pre-bent in a convex manner. This results in a convex upper side and a concave lower side. A wiper strip 14 is fastened to the spring rail 12, in particular to the concave lower side of the spring rail 12, which wiper strip is placed on the windshield of a motor vehicle in the assembled position.

[0020] A wind deflector strip 16 is fastened to the side of the spring rail 12 facing away from the wiper strip 14, i.e., to the protruding upper side. The wiper blade 10 has a longitudinal extension (double arrow L), wherein a fastening element 18 is arranged approximately centrally to the longitudinal extension and serves to fasten the wiper blade 10 to a wiper arm, which is not shown here for reasons of clarity. An end cap 20 is provided at each end of the longitudinal extension (double arrow L) and closes the wiper blade 10 along its longitudinal extension (double arrow L).

[0021] exist Figure 2Schematically shows a transverse section of a wiper strip 14 of a wiper blade 10 according to the invention. The wiper strip 14 comprises a wiper lip 22 and a fastening region 24. The wiper lip 22 is fastened to the fastening region 24 via an inclined web 26. The fastening region 24 has a fastening element 28, which serves to fasten the wiper strip 14 to the spring rail 12.

[0022] The wiper strip 14 has a first liquid channel 30 and a second liquid channel 32 in the fastening region 24, through which the cleaning liquid can be conducted. The first liquid channel 30 also has a first opening 34, through which the cleaning liquid can be discharged in the direction of the wiper lip 22. The second liquid channel 32 also has a second opening 36, with which the cleaning liquid can also be discharged in the direction of the windshield or the wiper lip 22.

[0023] A heating device 38 is arranged within the first liquid channel 30 and the second liquid channel 32. The heating device 38 comprises a heating wire which is provided with a sheath made of plastic for insulation against the cleaning liquid. In a variant, a ceramic sheath can also be provided.

[0024] Here, the fastening element 28 has two grooves 40, into which a part of the two-part spring rail 12 can be inserted. However, any other fastening structure at the spring rail 12 is also possible. In addition to the form-fitting connection shown, an adhesive connection or a friction-locking connection can also be provided.

[0025] exist Figure 3 1 shows a schematic side view of the region of the middle of the fastening element 18 of the wiper blade 10 according to the invention. First openings 34 are arranged distributed along the longitudinal extension (double arrow L). The fastening element 18 overlaps the fastening region 24 of the wiper strip 14. A first liquid channel 30 is arranged in the fastening region 24 above the oblique ridge 26 of the wiper strip 14. The first liquid channel 30 branches off in the region of the fastening element 18 so that the first liquid channel 30 can be supplied from the wiper arm using a liquid channel supply (not shown here) so that cleaning liquid can flow into the first liquid channel 30. A heating device 38 extends within the first liquid channel 30, which extends partially within the fastening element 18.

[0026] The fastening element 18 also has a fastening hole, at which the wiper arm can be fastened. For this purpose, fastening variants known in the prior art are conceivable. In particular, the fastening hole 14 can be implemented as a pin or an opening, into which a pin of the wiper arm or an opening of the wiper arm is correspondingly embedded.

[0027] In a variant of the present invention, the first liquid channel 30 also does not need to extend through the fastener 18, but only extends through the heating device 38. The first liquid channel 30 will then be loaded with liquid at other locations. The fastener 18 is made of plastic, but in a variant it can also be made of metal. The first opening 34 or the second opening 36 can also be provided with a nozzle element to obtain a suitable spraying feature.

[0028] exist Figure 3 Only the first liquid channel 30 is shown in each. The second liquid channel 32 ( Figure 2 ) is located directly behind the first liquid channel in the side view, so that the corresponding situation described for the first liquid channel 30 applies to the second liquid channel 32.

[0029] In a variant of the present invention, it is also possible to provide only a single liquid channel 30 , ie, to provide only the first liquid channel 30 and to dispense with the second liquid channel 32 .

[0030] In another variant of the present invention, the first liquid channel 30 and / or the second liquid channel 32 can also be configured separately from the wiper strip 14. The first liquid channel 30 and / or the second liquid channel 32 can then also be arranged as separate channels on the spring rail 12. Furthermore, the first liquid channel 30 can also extend only in the fastening element 18, wherein the first opening 34 or the second opening 36 is also provided only in the fastening element. The heating device 38 then likewise extends only in the fastening element 18.

Claims

1. A wiper blade (10), comprising a wiper strip (14) extending along a longitudinal extension (L), a liquid channel (30) for guiding a cleaning liquid along the longitudinal extension (L), and a heating device, characterized in that: The heating device is arranged completely within the liquid channel (30) and extends along the longitudinal extension (L), wherein the wiper blade (10) has a fastening element (18) for fastening to a wiper arm, and the heating device and the liquid channel (30) are each guided completely through the fastening element (18) along the longitudinal extension (L).

2. The wiper blade (10) according to claim 1, characterized in that The heating device (38) is designed as a sheathed heating wire.

3. The wiper blade (10) according to claim 1, characterized in that The heating device (38) comprises a heating wire with a plastic sheath.

4. The wiper blade (10) according to claim 1, characterized in that The liquid channel (30) has at least one opening (34) for discharging cleaning liquid.

5. The wiper blade (10) according to claim 4, characterized in that A plurality of openings (34) are provided, which are arranged in a distributed manner over the longitudinal extension.

6. The wiper blade (10) according to any one of the preceding claims, characterized in that The fluid channel (30) is formed integrally with the wiper strip (14).

7. The wiper blade (10) according to any one of the preceding claims 1 to 5, characterized in that The wiper strip (14) comprises a wiper lip (22) and is designed in one piece.

8. The wiper blade (10) according to any one of the preceding claims 1 to 5, characterized in that At least one fluid passage (30) extends in the fastener (18).

9. The wiper blade (10) according to any one of the preceding claims 1 to 5, characterized in that The liquid channel (30) has at least one opening (34) in the fastening element (18) for discharging cleaning liquid.

10. The wiper blade (10) according to claim 1, characterized in that The wiper blade (10) is used for a motor vehicle.

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