Wiper lever

Abstract

A wiper rod (10) for cleaning a vehicle window by means of movement in a first and a second direction is proposed. The wiper rod comprises a wiper blade (12), a wiper arm (14), an adapter (16) for fixing the wiper blade (12) to the wiper arm (14), and a hydraulic system (18) that guides liquid from the vehicle via the wiper arm (14) to the wiper blade (12) so as to discharge the liquid at the wiper blade (12) through a nozzle (20). The wiper rod has at least one nozzle (20) aligned in the first direction (1) and one nozzle (20) aligned in the second direction. According to the present invention, a first valve (221) for the first direction is positioned closer to the nozzle (20) in the flow direction (3) of the liquid than a second valve (222) for the second direction (2).

Description

Technical Field

[0001] The invention relates to a wiper lever for cleaning a vehicle windshield by means of a movement in a first direction and a second direction, the wiper lever comprising a wiper blade, a wiper arm, an adapter for fastening the wiper blade to the wiper arm, and a hydraulic system, which conducts liquid from the vehicle via the wiper arm to the wiper blade so that the liquid is discharged at the wiper blade through nozzles, wherein at least one nozzle is aligned in the first direction and one nozzle is aligned in the second direction. Background Art

[0002] Wiper blades with nozzles are known that direct liquid directly to the wiper blade and discharge it there. The liquid is supplied by a liquid pump located in the vehicle. If a valve is placed in the pipeline required for supply to control the liquid flow, then when the valve is spaced apart from the nozzle, there is a delay between the liquid emerging from the nozzle and the pump being activated. This is because the section of the pipeline between the valve and the nozzle is empty. The pump must refill this empty section of the pipeline with liquid before the liquid can be discharged. The greater the distance between the valve and the nozzle, the longer it takes to fill the empty section of the pipeline. In particular, if the wiper bar can spray in two directions, providing a valve for each direction is advantageous in that at least one direction does not experience a significant delay. Summary of the Invention

[0003] SUMMARY OF THE INVENTION The object of the present invention is to provide a hydraulic system for a wiper lever which ensures extremely short reaction times of the nozzles.

[0004] It is recommended that a first valve for a first direction be positioned closer to the nozzle in the direction of liquid flow than a second valve for a second direction. A pipeline extends from a reservoir with a pump for the liquid provided for cleaning to the nozzle. The valve is arranged in the pipeline. The pipeline section between the nozzle and the valve for the first valve is shorter than that for the second valve. This reduces the reaction time for discharging the liquid in the first direction.

[0005] The cleaning motion can advantageously be a reciprocating motion of the wiper rod, with the first direction being upward wiping and the second direction being downward wiping. The first valve allows liquid to pass to nozzles aligned in the first direction, while the second valve allows liquid to pass to nozzles aligned in the second direction. The nozzles' response time for spraying liquid is shortened during the upward motion because the first valve is located directly on the adapter. This allows for a balanced response time during upward and downward wiping.

[0006] It may be particularly preferred if the second valve is impermeable to liquid when moved in the first direction, wherein the first valve is impermeable to liquid when moved in the second direction, thereby preventing the line from being unintentionally emptied.

[0007] A particular embodiment can include arranging the first valve upstream of a fixing bracket of the wiper arm in the direction of flow of the liquid, wherein the fixing bracket extends transversely to the longitudinal extent of the wiper arm. The fixing bracket surrounds the adapter part on the wiper blade side and fixes the wiper blade to the wiper arm. The valve is arranged in particular in a groove between the bracket and the wiper arm.

[0008] To ensure a quick response time, the first valve and the second valve are advantageously arranged at different distances from the liquid pump. The liquid pump can be arranged in the vehicle together with the liquid reservoir. Preferably, by arranging the first valve close to the nozzle area and further adjusting the distance between the first valve and the pump, liquid can be discharged from the nozzle for the first direction sooner after the pump is actuated than from the nozzle for the second direction.

[0009] Of course, the features mentioned above and those yet to be explained below can be used not only in the respectively specified combination but also in other combinations. The scope of the invention is limited solely by the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The invention will be explained in more detail below using exemplary embodiments with reference to the accompanying drawings.

[0011] Figure 1 The wiper lever with valve is shown. DETAILED DESCRIPTION

[0012] Figure 1 A wiper bar 10 is shown for cleaning a vehicle windshield by means of a reciprocating motion, wherein the motion takes place in a first and a second direction 1, 2. The first direction 1 represents upward wiping along the windshield, while the motion in the second direction represents downward wiping.

[0013] The wiper lever 10 includes a wiper blade 12, a wiper arm 14, and an adapter 16 for securing the wiper blade 12 to the wiper arm 14. The adapter 16 comprises an adapter part on the wiper blade side and an adapter part on the wiper arm side. The adapter part on the wiper arm side has a fixing bracket 22 that surrounds the adapter part on the wiper blade side when the wiper blade 12 is secured to the wiper arm 14. However, according to the claims, the present invention is also applicable to adapters without the fixing bracket 22. A two-part adapter part on the wiper blade side can be provided, wherein one part of the adapter part on the wiper blade side is movable.

[0014] The hydraulic system 18 is part of the wiper arm, wherein the hydraulic system 18 has a liquid line 19, a reservoir for the liquid and a pump 24. The pump 24 conveys the liquid from the vehicle through a line via the wiper arm 14 to the wiper blade 12 so that the liquid is discharged at the wiper blade 12 through a nozzle 20.

[0015] At least two nozzles 20 are provided, at least one nozzle 20 being aligned in the first direction 1 and one nozzle 20 being aligned in the second direction. The nozzles can be formed into a rubber element of the wiper blade 12, for example a wiper rubber or a spoiler, and / or can be formed into a separate nozzle unit fastened to the wiper blade 12. A heating element can also be provided, which prevents the liquid from freezing, wherein the heating element is arranged in the region of the nozzles and / or the lines.

[0016] The first valve 221, which controls the discharge of liquid in a first direction, is positioned closer to the nozzle 20 in the liquid flow direction 3 than the second valve 222, which controls the discharge of liquid in a second direction 2. The liquid flows from the reservoir and pump 24 toward the nozzle 20. When a reciprocating cleaning motion is implemented, the first direction 1 represents upward wiping. The second direction 2 represents downward wiping. The first valve 221 allows liquid to pass to the nozzle 20 aimed in the first direction 1. This occurs during upward wiping, while the second valve 222 allows liquid to pass to the nozzle aimed in the second direction 2 during downward wiping. The liquid is sprayed directly in front of the wiper rubber of the wiper blade 12 so that it can be quickly wiped off the wiper blade after application. The two valves 221 and 222 alternate during the wiping motion, so that when wiping upward, the first valve 221 is open and the second valve 222 is closed, while when wiping downward, the second valve is open and the first valve 221 is closed.

[0017] Since the wiping process usually begins with an upward movement, the time until the liquid is discharged can be shortened by positioning the first valve 221 spatially close to the nozzle 20. Furthermore, the time until the liquid is discharged can also be set by the length of the line 19 from the pump 24 or the reservoir to the valves 221, 222. The closer the valves 221, 222 are to the pump 24 or the reservoir, the faster the liquid can reach the nozzle 20.

[0018] The first valve 221 is arranged in the flow direction of the liquid upstream of the fixing bracket 22 of the wiper arm 14, wherein the fixing bracket 22 extends transversely to the longitudinal extent of the wiper arm 14. The first valve 221 is arranged in a groove between the fixing bracket 22 and the wiper arm 14, wherein the valve 221 is arranged on the side of the fixing bracket 22 facing the vehicle.

[0019] Reference Signs List

[0020] 1 First Direction

[0021] 2 Second direction

[0022] 3 Flow direction

[0023] 10 Wiper lever

[0024] 12 Wiper Blades

[0025] 14 Wiper Arm

[0026] 16 Adapter

[0027] 18 Hydraulic system

[0028] 19 pipelines

[0029] 20 nozzles

[0030] 22 Fixed bow

[0031] 24 Liquid Pumps

[0032] 221 First Valve

[0033] 222 Second Valve

Claims

1. A wiper lever (10) for cleaning a vehicle window by means of a movement in a first and a second direction, the wiper lever comprising a wiper blade (12), a wiper arm (14), an adapter (16) for fastening the wiper blade (12) to the wiper arm (14), and a hydraulic system (18), the hydraulic system conveying a liquid from the vehicle via the wiper arm (14) to the wiper blade (12) in order to discharge the liquid through a nozzle (20) at the wiper blade (12), wherein: At least one nozzle (20) is aligned in a first direction (1) and one nozzle (20) is aligned in a second direction, characterized in that a first valve (221) for the first direction is positioned closer to the nozzle (20) in the flow direction (3) of the liquid than a second valve (222) for the second direction (2), and after operating a liquid pump (24), the liquid is discharged from the nozzle (20) for the first direction in a shorter time than from the nozzle (20) for the second direction (2).

2. The wiper lever (10) according to claim 1, characterized in that The motion for cleaning is a reciprocating motion, wherein the first direction is upward wiping and the second direction (2) is downward wiping, wherein the first valve (221) allows liquid to pass to the nozzle (20) aligned in the first direction (1) and the second valve (222) allows liquid to pass to the nozzle aligned in the second direction.

3. The wiper lever (10) according to claim 1 or 2, characterized in that When moving in the first direction (1), the second valve (222) is impermeable to liquid, wherein when moving in the second direction (2), the first valve (221) is impermeable to liquid.

4. The wiper lever (10) according to claim 1 or 2, characterized in that The first valve (221) is arranged upstream of a fixing bracket (22) of the wiper arm (14) in the flow direction of the liquid, wherein the fixing bracket (22) extends transversely to the longitudinal extent of the wiper arm (14).

5. The wiper lever (10) according to claim 1 or 2, characterized in that The first valve (221) and the second valve (222) are located at different distances from the liquid pump (24).

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