WO2009092669A1 - Device for dispensing and spraying a washing liquid onto the window of an automobile and wiper system including such spraying device - Google Patents

Device for dispensing and spraying a washing liquid onto the window of an automobile and wiper system including such spraying device Download PDF

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Publication number
WO2009092669A1
WO2009092669A1 PCT/EP2009/050487 EP2009050487W WO2009092669A1 WO 2009092669 A1 WO2009092669 A1 WO 2009092669A1 EP 2009050487 W EP2009050487 W EP 2009050487W WO 2009092669 A1 WO2009092669 A1 WO 2009092669A1
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WO
WIPO (PCT)
Prior art keywords
liquid
pressure
projection
window
dispensing
Prior art date
Application number
PCT/EP2009/050487
Other languages
French (fr)
Inventor
Gérald CAILLOT
Original Assignee
Valeo Systemes D'essuyage
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes D'essuyage filed Critical Valeo Systemes D'essuyage
Priority to EP09704803A priority Critical patent/EP2244916A1/en
Publication of WO2009092669A1 publication Critical patent/WO2009092669A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/46—Cleaning windscreens, windows or optical devices using liquid; Windscreen washers
    • B60S1/48—Liquid supply therefor
    • B60S1/52—Arrangement of nozzles; Liquid spreading means
    • B60S1/522—Arrangement of nozzles; Liquid spreading means moving liquid spreading means, e.g. arranged in wiper arms
    • B60S1/524—Arrangement of nozzles; Liquid spreading means moving liquid spreading means, e.g. arranged in wiper arms arranged in wiper blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/46—Cleaning windscreens, windows or optical devices using liquid; Windscreen washers
    • B60S1/48—Liquid supply therefor
    • B60S1/481—Liquid supply therefor the operation of at least part of the liquid supply being controlled by electric means
    • B60S1/485—Liquid supply therefor the operation of at least part of the liquid supply being controlled by electric means including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/38—Wiper blades
    • B60S1/3806—Means, or measures taken, for influencing the aerodynamic quality of the wiper blades
    • B60S1/381—Spoilers mounted on the squeegee or on the vertebra
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/38—Wiper blades
    • B60S1/3848—Flat-type wiper blade, i.e. without harness
    • B60S1/3874—Flat-type wiper blade, i.e. without harness with a reinforcing vertebra
    • B60S1/3875—Flat-type wiper blade, i.e. without harness with a reinforcing vertebra rectangular section
    • B60S1/3881—Flat-type wiper blade, i.e. without harness with a reinforcing vertebra rectangular section in additional element, e.g. spoiler

Definitions

  • the present invention relates to a device for dispensing and spraying a washing liquid on a motor vehicle window. It also relates to a wiper system comprising said projection device.
  • the invention finds a particularly advantageous application in the field of wiper systems for motor vehicles, and more particularly in that of wiper systems comprising flat wiper blades, also known by the generic term of "Fiat Blade”.
  • washing liquid spray devices consist of one or more nozzles placed on the hood of the vehicle.
  • a pump performs under a pressure of 2 to 4 bar the transfer of a certain amount of washing liquid from a tank up to to the nozzles, the liquid arriving on the glass to be cleaned, the windshield of the vehicle for example, in the form of jet or tablecloth.
  • an object of the invention is to provide a device for dispensing and spraying a washing liquid on a window of a motor vehicle, said device comprising at least one liquid transport ramp pierced with at least one a washing liquid projection hole on said window, which would project a larger quantity of liquid when the temperature outside the vehicle becomes, for example low (below 5 ° C) or negative, while maintaining a liquid flow rate reduced to the minimum necessary when the outside temperature is positive.
  • said transport ramp further comprises at least one additional projection means adapted to project the washing liquid on said window under a liquid pressure greater than a threshold given pressure.
  • the projection device allows to project the washing liquid through the (s) only (s) hole (s) projection under a nominal pressure ensuring a minimum flow, and this as long as the outside temperature remains above a given threshold, for example the freezing temperature of water, ie 0 ° C.
  • the washing liquid can be also projected, in addition to the projection holes, through the complementary projection means, it suffices for this purpose. bring the pressure of the liquid to a value greater than the pressure threshold beyond which the complementary projection means is adapted to project liquid.
  • This pressure threshold is a characteristic quantity of the complementary projection means.
  • the respective values of the nominal liquid pressure for the positive temperatures and the pressure threshold are chosen such that the pressure threshold is greater than the nominal pressure. This produces an increase in liquid flow only for negative temperatures, in accordance with the purpose of the invention.
  • said complementary projection means comprises a perforation made through said transport ramp, said liquid pressure threshold being PatXML 4/10 WFR1194 PCT
  • Perforation means an opening made without removal of material, for example by means of a needle passing through an elastomeric transport ramp.
  • the notion of "hole” on the contrary implies a removal of material.
  • the perforation is "closed” in the sense that its edges remain contiguous, a pressure force greater than a given threshold is necessary to separate them and "open” and the perforation.
  • said complementary projection means comprises a complementary hole pierced through said transport ramp, and a closure means adapted to close said complementary hole under the action of a elastic return force, said pressure threshold being defined by the pressure to be applied to said closure means to exert a force equal to said elastic return force.
  • the invention also relates to a wiper system of a motor vehicle window, comprising a projection device according to the invention.
  • the wiper system comprises a temperature sensor for determining the washing liquid pressure to be supplied by at least one pump. supply according to the temperature outside the vehicle measured by said sensor.
  • said transport ramp extends along a wiper blade of the wiper system.
  • said wiper blade is a flat broom.
  • the invention furthermore relates to a windscreen wiper blade comprising a PatXML 5/10 WFR1194 PCT
  • Figure 1 is a sectional view of a flat wiper blade comprising a liquid projection device according to the invention.
  • Figure 2 is a side view of a transport ramp of the projection device of Figurei.
  • Figure 3a is an operating diagram of a wiper system according to the invention to a feed pump.
  • Figure 3b is an operating diagram of a wiper system according to the invention with two feed pumps.
  • Figure 4 is a graph giving the number of effective projection orifices depending on the outside temperature of the vehicle.
  • Figure 5 is a sectional view of a transport ramp comprising a variant of the complementary projection means according to the invention.
  • Figure 1 is shown in section a wiper blade belonging to a wiper system of a motor vehicle window, windshield or rear window in particular.
  • the wiper blade of Figure 1 is made in accordance with the technology "flat blade” or “Fiat Blade” and has as such a longitudinal support 10 extruded semi-rigid plastic material in which is housed a metal stiffening rod, or “vertebra", of curved shape, extending substantially over the entire length of the blade so as to create a distribution of pressure on the window as uniform as possible.
  • the support 10 also comprises a longitudinal claw 12 in which is introduced an elastomeric wiper blade 30.
  • a device 40 for projecting a washing liquid of the vehicle window comprising one or two ramps 41 of liquid transport which also extend the along the wiper blade. These ramps 41 are pierced with orifices for spraying washing liquid on the window, referenced PatXML 6/10 WFR1194 PCT
  • the projection device 40 is associated with an aerodynamic deflector 50 in the same molded elastomer part, reinforced by a longitudinal rib 13 of the support 10.
  • FIG. 2 shows that the projection orifices 42 of the transport ramps 41 are of two types, namely permanently open projection holes 42a and complementary projection means constituted in this exemplary embodiment by perforations 42b capable of to spray the washing liquid on the vehicle window provided that the liquid pressure is sufficient, that is to say at least equal to a given pressure threshold.
  • said perforations 42b are made without removal of material, by laser in the example of the notches cross of Figure 2 or by means of a cold needle. It is understood that, if the liquid pressure inside the ramp 41 is small, only the holes 42a open at all times are operational and let the liquid pass, while the perforations 42b remain closed, the pressure being below the threshold of pressure necessary to overcome the stiffness of the elastomer and spread the edges of the perforations so as to allow the passage of the washing liquid. Note that the holes 42a are made by removal of material, by machining or by means of a laser or a heated needle.
  • This configuration is suitable when the amount necessary for satisfactory cleaning of the window is limited, especially to remove traces of mud or insect residues, in positive outdoor temperature conditions. It is then expected from the ramp supply system 41 in washing liquid that it supplies the liquid under a pressure lower than the opening threshold of the perforations 42b.
  • the pressure of the liquid in the ramp 41 is brought by the system PatXML 7/10 WFR1194 PCT
  • FIG. 3a illustrates a wiper system incorporating at least one ramp 41 provided with projection orifices 42a, 42b as they have just been described with reference to FIG. 2.
  • the ramp 41 is fed from a reservoir 62 of washing liquid via a pump 61 adapted to deliver the liquid under a first pressure P 0 , lower than the opening threshold P 8 of the perforations 42b, and under a second pressure P 1 to less than the P 8 threshold.
  • the outside temperature T supplied, directly or indirectly, by a temperature sensor 70 installed on the vehicle is compared with a threshold temperature T 8 , the temperature 0 ° C of freezing water in the embodiment example treated here.
  • the pump 61 is set to provide the washing liquid to the ramp 41 under a pressure equal to the first pressure P 0 . In this case, the liquid consumption is reduced.
  • Figure 3b shows a wiper system with two pumps 61a, 61b supply.
  • the graph of FIG. 4 gives, as a function of the outside temperature T, the number of holes 42a that are efficient in dotted lines, the number of PatXML 8/10 WFR1194 PCT
  • perforations 42b effective in phantom, and the total number of effective orifices in solid line The reduction in the number of orifices effective at low temperatures is due to the increase in the viscosity of the washing liquid, which is particularly noticeable at the level of the furthest orifices.
  • Figure 5 is an alternative embodiment of the complementary closure means of the invention.
  • the complementary closure means 42c comprises, on the one hand, a complementary hole 421c, similar to the holes 42a of Figure 2, pierced through the transport ramp 41 and, on the other hand, a means 422c for closing the hole 421c constituted, in the example of FIG. 5, by a tongue-shaped element of the wall of the ramp 41 able to be applied against the hole 421c under the action of a force of return related to the elastic nature of the material in which the ramp 41 is made.
  • the pressure threshold is in this case defined by the pressure to be applied to the shutter means to exert a force equal to said restoring force.
  • the closing element 422c closes on the hole 421c by elastic hinge effect.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Nozzles (AREA)

Abstract

The invention relates to a device for dispensing and spraying a washing liquid onto the window of an automobile, wherein said device includes at least one liquid-conveying rail (41) including at least one hole (42a) for spraying a washing liquid onto said window. According to the invention, said conveyor rail (41) further includes at least one additional spraying means (42b) capable of spraying a washing liquid onto said window at a liquid pressure higher than a predetermined pressure threshold. The invention can be used in automobile wiper systems.

Description

PatXML 1/10 WFR1194 PCT PatXML 1/10 WFR1194 PCT
DescriptionDescription
DISPOSITIF DE DISTRIBUTION ET DE PROJECTION D'UN LIQUIDE DEDEVICE FOR DISTRIBUTING AND PROJECTING A LIQUID OF
LAVAGE SUR UNE VITRE DE VEHICULE AUTOMOBILE ET SYSTEMEWASHING ON A GLASS OF A MOTOR VEHICLE AND SYSTEM
D'ESSUYAGE COMPRENANT LEDIT DISPOSITIF DE PROJECTIONWIPING COMPRISING SAID PROJECTION DEVICE
[0001] La présente invention concerne un dispositif de distribution et de projection d'un liquide de lavage sur une vitre de véhicule automobile. Elle concerne également un système d'essuyage comprenant ledit dispositif de projection.The present invention relates to a device for dispensing and spraying a washing liquid on a motor vehicle window. It also relates to a wiper system comprising said projection device.
[0002] L'invention trouve une application particulièrement avantageuse dans le domaine des systèmes d'essuyage pour véhicules automobiles, et plus spécialement dans celui des systèmes d'essuyage comprenant des balais d'essuie-glace plats, également connus sous le terme générique de « Fiat Blade ».The invention finds a particularly advantageous application in the field of wiper systems for motor vehicles, and more particularly in that of wiper systems comprising flat wiper blades, also known by the generic term of "Fiat Blade".
[0003] Actuellement, les dispositifs de projection de liquide de lavage les plus utilisés sont constitués d'un ou plusieurs gicleurs placés sur le capot du véhicule. Lorsque l'utilisateur active le dispositif de projection au moyen d'un organe de commande situé généralement à proximité du volant, une pompe effectue sous une pression de 2 à 4 bars le transfert d'une certaine quantité de liquide de lavage depuis un réservoir jusqu'aux gicleurs, le liquide arrivant sur la vitre à nettoyer, le pare-brise du véhicule par exemple, sous forme de jet ou de nappe.Currently, the most used washing liquid spray devices consist of one or more nozzles placed on the hood of the vehicle. When the user activates the projection device by means of a control member located generally close to the steering wheel, a pump performs under a pressure of 2 to 4 bar the transfer of a certain amount of washing liquid from a tank up to to the nozzles, the liquid arriving on the glass to be cleaned, the windshield of the vehicle for example, in the form of jet or tablecloth.
[0004] L'inconvénient de ces dispositifs de projection connus est qu'ils consomment une quantité assez importante de liquide de lavage, et ceci pour plusieurs raisons.The disadvantage of these known projection devices is that they consume a fairly large amount of washing liquid, and this for several reasons.
[0005] Une de ces raisons est l'écoulement d'une partie du liquide projeté hors de la zone d'essuyage du fait que les gicleurs ne sont pas correctement orientés ou mal réglés. Cette fraction de liquide ne participant pas au nettoyage est donc perdue.One of these reasons is the flow of a portion of the liquid sprayed out of the wiping area because the sprinklers are not properly oriented or incorrectly adjusted. This fraction of liquid not participating in the cleaning is lost.
[0006] II peut se produire également que du liquide pourtant projeté par les gicleurs ne parvient pas jusqu'au pare-brise à cause d'un fort vent ou d'une vitesse élevée du véhicule par exemple qui dévient le jet de liquide de sa trajectoire normale, ou encore du fait que les gicleurs partiellement bouchés par des impuretés dispersent le jet ou le projettent dans une PatXML 2/10 WFR1194 PCTIt may also occur that the liquid yet sprayed by the sprinklers does not reach the windshield because of a strong wind or a high speed of the vehicle for example that deviate the jet of liquid from its normal trajectory, or because the jets partially clogged with impurities disperse the jet or throw it into a PatXML 2/10 WFR1194 PCT
direction différente de sa direction de projection nominale.direction different from its nominal projection direction.
[0007] Pour remédier à ces inconvénients et obtenir une moindre consommation en liquide de lavage, il est proposé des dispositifs de distribution et de projection qui sont intégrés au système d'essuyage lui-même. Ces dispositifs intégrés se présentent sous la forme d'au moins une rampe de transport de liquide percée d'une pluralité de trous de projection sur au moins une partie de sa longueur. Le liquide de lavage est amené jusqu'à la rampe par une pompe d'alimentation reliée au réservoir de liquide et est projeté sur la surface de la vitre à travers les trous de projection.To overcome these disadvantages and obtain a lower consumption of washing liquid, it is proposed distribution and projection devices that are integrated into the wiper system itself. These integrated devices are in the form of at least one liquid transport ramp pierced with a plurality of projection holes over at least a portion of its length. The washing liquid is brought to the ramp by a feed pump connected to the liquid reservoir and is projected onto the surface of the glass through the projection holes.
[0008] La demande internationale n° WO2007/000346 décrit une réalisation d'un tel dispositif de projection où les rampes de transport percées de trous de projection sont disposées de part et d'autre le long de la lame d'essuyage d'un balai d'essuie-glace plat conforme à la technologie « Fiat Blade ».[0008] International Application No. WO2007 / 000346 describes an embodiment of such a projection device where the transport ramps pierced with projection holes are arranged on either side along the wiper blade of a Flat wiper blade conforming to "Fiat Blade" technology.
[0009] On comprend aisément que ces dispositifs de distribution et de projection à rampes intégrées conduisent à une diminution sensible de la consommation en liquide de lavage pour un même résultat de nettoyage. En effet, le liquide étant projeté directement sur la vitre, à proximité immédiate de la lame d'essuyage, exactement sur la zone à essuyer et dans le même mouvement, aucune perte ne peut se produire par déviation ou dispersion du jet et la totalité de la quantité de liquide projetée est utilisée par la lame d'essuyage pour nettoyer la vitre. L'efficacité de ces dispositifs de projection est donc maximum.It is easy to understand that these distribution devices and projection integrated ramps lead to a significant decrease in the consumption of washing liquid for the same cleaning result. Indeed, the liquid being sprayed directly on the glass, in the immediate vicinity of the wiper blade, exactly on the area to be wiped and in the same movement, no loss can occur by deviation or dispersion of the jet and the entire the amount of liquid spray is used by the wiper blade to clean the glass. The efficiency of these projection devices is therefore maximum.
[0010] Cependant, dans des conditions de températures négatives, il peut se former à la surface de la vitre une couche de givre qui pour être éliminée nécessite une quantité de liquide de lavage beaucoup plus grande que celle habituellement utilisée à des températures positives pour débarrasser la vitre des particules solides pouvant s'y fixer, comme les projections de boue ou les résidus d'insectes écrasés.However, under conditions of negative temperatures, it can form on the surface of the glass a layer of frost which to be removed requires a much greater amount of washing liquid than that usually used at positive temperatures to rid the pane of solid particles that can attach to it, such as mud splashes or crushed insect residues.
[0011] Pour résoudre cette difficulté, on pourrait bien entendu penser à augmenter le débit nominal de liquide de lavage projeté sur la vitre, mais ceci se ferait au détriment de l'avantage mentionné plus haut des dispositifs de projection à rampes intégrées en termes d'économie de consommation de liquide dans des conditions de températures positives, PatXML 3/10 WFR1194 PCTTo solve this difficulty, one could of course think to increase the nominal flow rate of washing liquid projected on the glass, but this would be to the detriment of the advantage mentioned above projection devices integrated ramps in terms of economy of liquid consumption under conditions of positive temperatures, PatXML 3/10 WFR1194 PCT
qui sont les conditions les plus fréquentes.which are the most frequent conditions.
[0012] Aussi, un but de l'invention est de proposer un dispositif de distribution et de projection d'un liquide de lavage sur une vitre de véhicule automobile, ledit dispositif comprenant au moins une rampe de transport de liquide percé d'au moins un trou de projection de liquide de lavage sur ladite vitre, qui permettrait de projeter une quantité plus importante de liquide lorsque la température extérieure au véhicule devient, par exemple basse (inférieure à 5°C) ou négative, tout en maintenant un débit de liquide réduit au minimum nécessaire lorsque la température extérieure est positive.Also, an object of the invention is to provide a device for dispensing and spraying a washing liquid on a window of a motor vehicle, said device comprising at least one liquid transport ramp pierced with at least one a washing liquid projection hole on said window, which would project a larger quantity of liquid when the temperature outside the vehicle becomes, for example low (below 5 ° C) or negative, while maintaining a liquid flow rate reduced to the minimum necessary when the outside temperature is positive.
[0013] Ce but est atteint, conformément à l'invention, du fait que ladite rampe de transport comporte en outre au moins un moyen complémentaire de projection apte à projeter le liquide de lavage sur ladite vitre sous une pression de liquide supérieure à un seuil de pression donné.This object is achieved, according to the invention, because said transport ramp further comprises at least one additional projection means adapted to project the washing liquid on said window under a liquid pressure greater than a threshold given pressure.
[0014] Ainsi, le dispositif de projection selon l'invention permet de projeter le liquide de lavage à travers le(s) seul(s) trou(s) de projection sous une pression nominale assurant un débit minimum, et ceci tant que la température extérieure reste supérieure à un seuil donné, par exemple la température de congélation de l'eau, soit 0°C.Thus, the projection device according to the invention allows to project the washing liquid through the (s) only (s) hole (s) projection under a nominal pressure ensuring a minimum flow, and this as long as the outside temperature remains above a given threshold, for example the freezing temperature of water, ie 0 ° C.
[0015] Par contre, si la température extérieure descend au-dessous du seuil précité de 0°C, le liquide de lavage peut être également projeté, outre les trous de projection, à travers le moyen complémentaire de projection, il suffit pour cela d'amener la pression du liquide à une valeur supérieure au seuil de pression au-delà duquel le moyen complémentaire de projection est apte à projeter du liquide. Ce seuil de pression est une grandeur caractéristique du moyen complémentaire de projection. Les valeurs respectives de la pression nominale de liquide pour les températures positives et du seuil de pression sont choisies telles que le seuil de pression soit supérieur à la pression nominale. On obtient ainsi une augmentation de débit de liquide uniquement pour les températures négatives, conformément au but poursuivi par l'invention.By cons, if the outside temperature falls below the aforementioned threshold of 0 ° C, the washing liquid can be also projected, in addition to the projection holes, through the complementary projection means, it suffices for this purpose. bring the pressure of the liquid to a value greater than the pressure threshold beyond which the complementary projection means is adapted to project liquid. This pressure threshold is a characteristic quantity of the complementary projection means. The respective values of the nominal liquid pressure for the positive temperatures and the pressure threshold are chosen such that the pressure threshold is greater than the nominal pressure. This produces an increase in liquid flow only for negative temperatures, in accordance with the purpose of the invention.
[0016] Selon un premier mode de réalisation de l'invention, ledit moyen complémentaire de projection comprend une perforation réalisée à travers ladite rampe de transport, ledit seuil de pression de liquide étant PatXML 4/10 WFR1194 PCTAccording to a first embodiment of the invention, said complementary projection means comprises a perforation made through said transport ramp, said liquid pressure threshold being PatXML 4/10 WFR1194 PCT
sensiblement égal à la pression d'ouverture de ladite perforation.substantially equal to the opening pressure of said perforation.
[0017] On entend par « perforation » une ouverture réalisée sans enlèvement de matière, au moyen par exemple d'une aiguille traversant une rampe de transport en élastomère. La notion de « trou » au contraire implique un enlèvement de matière. Au repos, la perforation est « fermée » au sens où ses bords restent jointifs, une force de pression supérieure à un seuil donné étant nécessaire pour les écarter et « ouvrir » ainsi la perforation."Perforation" means an opening made without removal of material, for example by means of a needle passing through an elastomeric transport ramp. The notion of "hole" on the contrary implies a removal of material. At rest, the perforation is "closed" in the sense that its edges remain contiguous, a pressure force greater than a given threshold is necessary to separate them and "open" and the perforation.
[0018] Selon un deuxième mode de réalisation de l'invention, ledit moyen complémentaire de projection comprend un trou complémentaire percé à travers ladite rampe de transport, et un moyen d'obturation apte à obturer ledit trou complémentaire sous l'action d'une force de rappel élastique, ledit seuil de pression étant défini par la pression à appliquer audit moyen d'obturation pour exercer une force égale à ladite force de rappel élastique.According to a second embodiment of the invention, said complementary projection means comprises a complementary hole pierced through said transport ramp, and a closure means adapted to close said complementary hole under the action of a elastic return force, said pressure threshold being defined by the pressure to be applied to said closure means to exert a force equal to said elastic return force.
[0019] L'invention concerne également un système d'essuyage d'une vitre de véhicule automobile, comportant un dispositif de projection selon l'invention.The invention also relates to a wiper system of a motor vehicle window, comprising a projection device according to the invention.
[0020] Dans une application au nettoyage d'une vitre dans différentes conditions de température, l'invention prévoit que le système d'essuyage comprend un capteur de température destiné à déterminer la pression de liquide de lavage à fournir par au moins une pompe d'alimentation en fonction de la température extérieure au véhicule mesurée par ledit capteur.In an application to cleaning a window in different temperature conditions, the invention provides that the wiper system comprises a temperature sensor for determining the washing liquid pressure to be supplied by at least one pump. supply according to the temperature outside the vehicle measured by said sensor.
[0021] Cette disposition peut être mise en œuvre dans l'exemple d'application cité plus haut où l'on souhaite augmenter la quantité de liquide projeté lorsque la température extérieure au véhicule est négative. Dans ce cas, selon que la température extérieure mesurée par le capteur est positive ou négative, la pression de liquide fournie par la(es) pompe(s) d'alimentation doit être inférieure, respectivement supérieure, au seuil de pression du moyen complémentaire de projectionThis provision can be implemented in the application example cited above where it is desired to increase the amount of liquid spray when the outside temperature of the vehicle is negative. In this case, depending on whether the external temperature measured by the sensor is positive or negative, the liquid pressure supplied by the (e) pump (s) supply must be lower, respectively greater than the pressure threshold of the complementary means of projection
[0022] Avantageusement, ladite rampe de transport s'étend le long d'un balai d'essuie-glace du système d'essuyage.Advantageously, said transport ramp extends along a wiper blade of the wiper system.
[0023] En particulier, ledit balai d'essuie-glace est un balai plat.In particular, said wiper blade is a flat broom.
[0024] L'invention concerne en outre un balai d'essuie-glace comportant un PatXML 5/10 WFR1194 PCTThe invention furthermore relates to a windscreen wiper blade comprising a PatXML 5/10 WFR1194 PCT
dispositif de projection selon l'invention.projection device according to the invention.
[0025] La description qui va suivre en regard des dessins annexés, donnés à titre d'exemples non limitatifs, fera bien comprendre en quoi consiste l'invention et comment elle peut être réalisée.The following description with reference to the accompanying drawings, given by way of non-limiting examples, will explain in what the invention is and how it can be achieved.
[0026] La figure 1 est une vue en coupe d'un balai d'essuie-glace plat comportant un dispositif de projection de liquide conforme à l'invention.Figure 1 is a sectional view of a flat wiper blade comprising a liquid projection device according to the invention.
[0027] La figure 2 est une vue de côté d'une rampe de transport du dispositif de projection de la figurei .[0027] Figure 2 is a side view of a transport ramp of the projection device of Figurei.
[0028] La figure 3a est un diagramme de fonctionnement d'un système d'essuyage conforme à l'invention à une pompe d'alimentation.Figure 3a is an operating diagram of a wiper system according to the invention to a feed pump.
[0029] La figure 3b est un diagramme de fonctionnement d'un système d'essuyage conforme à l'invention à deux pompes d'alimentation.Figure 3b is an operating diagram of a wiper system according to the invention with two feed pumps.
[0030] La figure 4 est un graphe donnant le nombre d'orifices de projection efficaces en fonction de la température extérieure du véhicule.Figure 4 is a graph giving the number of effective projection orifices depending on the outside temperature of the vehicle.
[0031] La figure 5 est une vue en coupe d'une rampe de transport comportant une variante du moyen complémentaire de projection conforme à l'invention.Figure 5 is a sectional view of a transport ramp comprising a variant of the complementary projection means according to the invention.
[0032] Sur la figure 1 est représenté en coupe un balai d'essuie-glace appartenant à un système d'essuyage d'une vitre de véhicule automobile, pare-brise ou lunette arrière notamment.In Figure 1 is shown in section a wiper blade belonging to a wiper system of a motor vehicle window, windshield or rear window in particular.
[0033] Le balai d'essuie-glace de la figure 1 est réalisé conformément à la technologie « balai plat » ou « Fiat Blade » et présente à ce titre un support longitudinal 10 en matériau plastique semi-rigide extrudé dans lequel est logée une tige métallique 20 de rigidification, ou « vertèbre », de forme galbée, s'étendant sensiblement sur toute la longueur du balai de manière à créer une répartition de pression sur la vitre aussi uniforme que possible. Le support 10 comporte également une griffe longitudinale 12 dans laquelle est introduite une lame 30 d'essuyage en élastomère.The wiper blade of Figure 1 is made in accordance with the technology "flat blade" or "Fiat Blade" and has as such a longitudinal support 10 extruded semi-rigid plastic material in which is housed a metal stiffening rod, or "vertebra", of curved shape, extending substantially over the entire length of the blade so as to create a distribution of pressure on the window as uniform as possible. The support 10 also comprises a longitudinal claw 12 in which is introduced an elastomeric wiper blade 30.
[0034] Comme le montre la figure 1 , sur le support 10 est assemblé et fixé un dispositif 40 de projection d'un liquide de lavage de la vitre du véhicule comprenant une ou deux rampes 41 de transport de liquide qui s'étendent également le long du balai d'essuie-glace. Ces rampes 41 sont percées d'orifices de projection de liquide de lavage sur la vitre, référencés PatXML 6/10 WFR1194 PCTAs shown in Figure 1, on the support 10 is assembled and fixed a device 40 for projecting a washing liquid of the vehicle window comprising one or two ramps 41 of liquid transport which also extend the along the wiper blade. These ramps 41 are pierced with orifices for spraying washing liquid on the window, referenced PatXML 6/10 WFR1194 PCT
globalement 42 sur la figure 1. On peut également voir sur l'exemple de réalisation particulier représenté sur cette figure que le dispositif 40 de projection est associé à un déflecteur aérodynamique 50 dans une même pièce en élastomère moulé, renforcée par une nervure longitudinale 13 du support 10.overall 42 in Figure 1. It can also be seen on the particular embodiment shown in this figure that the projection device 40 is associated with an aerodynamic deflector 50 in the same molded elastomer part, reinforced by a longitudinal rib 13 of the support 10.
[0035] La figure 2 montre que les orifices 42 de projection des rampes 41 de transport sont de deux types, à savoir des trous 42a de projection ouverts en permanence et des moyens complémentaires de projection constitués dans cet exemple de réalisation par des perforations 42b aptes à projeter le liquide de lavage sur la vitre du véhicule à condition que la pression de liquide soit suffisante, c'est-à-dire au moins égale à un seuil de pression donné.FIG. 2 shows that the projection orifices 42 of the transport ramps 41 are of two types, namely permanently open projection holes 42a and complementary projection means constituted in this exemplary embodiment by perforations 42b capable of to spray the washing liquid on the vehicle window provided that the liquid pressure is sufficient, that is to say at least equal to a given pressure threshold.
[0036] Comme cela a déjà été mentionné plus haut, lesdites perforations 42b sont réalisées sans enlèvement de matière, par laser dans l'exemple des entailles en croix de la figure 2 ou encore au moyen d'une aiguille à froid. On comprend que, si la pression de liquide à l'intérieur de la rampe 41 est faible, seuls les trous 42a ouverts en permanence sont opérationnels et laissent passer le liquide, tandis que les perforations 42b restent fermées, la pression étant inférieure au seuil de pression nécessaire pour vaincre la raideur de l'élastomère et écarter les bords des perforations de manière à permettre le passage du liquide de lavage. Notons que les trous 42a sont réalisés par enlèvement de matière, par usinage ou au moyen d'un laser ou d'une aiguille chauffée.As already mentioned above, said perforations 42b are made without removal of material, by laser in the example of the notches cross of Figure 2 or by means of a cold needle. It is understood that, if the liquid pressure inside the ramp 41 is small, only the holes 42a open at all times are operational and let the liquid pass, while the perforations 42b remain closed, the pressure being below the threshold of pressure necessary to overcome the stiffness of the elastomer and spread the edges of the perforations so as to allow the passage of the washing liquid. Note that the holes 42a are made by removal of material, by machining or by means of a laser or a heated needle.
[0037] Cette configuration convient lorsque la quantité nécessaire à un nettoyage satisfaisant de la vitre est limitée, notamment pour éliminer les traces de boue ou les résidus d'insectes, dans des conditions de température extérieure positive. On attend alors du système d'alimentation des rampes 41 en liquide de lavage qu'il fournisse le liquide sous une pression inférieure au seuil d'ouverture des perforations 42b.This configuration is suitable when the amount necessary for satisfactory cleaning of the window is limited, especially to remove traces of mud or insect residues, in positive outdoor temperature conditions. It is then expected from the ramp supply system 41 in washing liquid that it supplies the liquid under a pressure lower than the opening threshold of the perforations 42b.
[0038] Lorsque la température extérieure devient négative ou en deçà d'un seuil prédéfini, la quantité de liquide de lavage à projeter doit augmenter afin de faire fondre la couche de givre susceptible de se former sur la vitre. A cet effet, la pression du liquide dans la rampe 41 est amenée par le système PatXML 7/10 WFR1194 PCTWhen the outside temperature becomes negative or below a predefined threshold, the amount of washing liquid to be sprayed must increase to melt the frost layer may form on the glass. For this purpose, the pressure of the liquid in the ramp 41 is brought by the system PatXML 7/10 WFR1194 PCT
d'alimentation à une valeur supérieure au seuil d'ouverture des perforations 42b, de sorte que le débit de liquide à travers les perforations 42b ainsi ouvertes s'ajoute au débit de liquide à travers les trous 42a.supply to a value greater than the opening threshold of the perforations 42b, so that the flow of liquid through the perforations 42b thus opened adds to the flow of liquid through the holes 42a.
[0039] La figure 3a illustre un système d'essuyage incorporant au moins une rampe 41 munie d'orifices 42a, 42b de projection tels qu'ils viennent d'être décrits en référence à la figure 2. La rampe 41 est alimentée à partir d'un réservoir 62 de liquide de lavage par l'intermédiaire d'une pompe 61 apte à délivrer le liquide sous une première pression P0, inférieure au seuil P8 d'ouverture des perforations 42b, et sous une deuxième pression P1 au moins égale au seuil P8.FIG. 3a illustrates a wiper system incorporating at least one ramp 41 provided with projection orifices 42a, 42b as they have just been described with reference to FIG. 2. The ramp 41 is fed from a reservoir 62 of washing liquid via a pump 61 adapted to deliver the liquid under a first pressure P 0 , lower than the opening threshold P 8 of the perforations 42b, and under a second pressure P 1 to less than the P 8 threshold.
[0040] La température extérieure T fournie, directement ou indirectement, par un capteur 70 de température installé sur le véhicule est comparée à une température T8 de seuil, la température 0°C de congélation de l'eau dans l'exemple de réalisation traité ici.The outside temperature T supplied, directly or indirectly, by a temperature sensor 70 installed on the vehicle is compared with a threshold temperature T 8 , the temperature 0 ° C of freezing water in the embodiment example treated here.
[0041] Si la température extérieure T est supérieure au seuil T8, la pompe 61 est réglée de manière à fournir le liquide de lavage à la rampe 41 sous une pression égale à la première pression P0. Dans ce cas, la consommation en liquide est réduite.If the outside temperature T is greater than the threshold T 8 , the pump 61 is set to provide the washing liquid to the ramp 41 under a pressure equal to the first pressure P 0 . In this case, the liquid consumption is reduced.
[0042] Si la température extérieure T devient inférieure au seuil T8, une augmentation du débit de liquide est obtenue en ajustant le fonctionnement de la pompe 61 de sorte que la pression du liquide soit égale à la deuxième pression P1, supérieure au seuil P8.If the outside temperature T becomes lower than the threshold T 8 , an increase in the liquid flow is obtained by adjusting the operation of the pump 61 so that the pressure of the liquid is equal to the second pressure P 1 , greater than the threshold. P 8 .
[0043] La figure 3b montre un système d'essuyage à deux pompes 61a, 61 b d'alimentation. Une première pompe 61a est destinée à fournir, comme la pompe 61 de la figure 3a, une pression P0 inférieure au seuil P8 d'ouverture des perforations 42b, lorsque la température extérieure T est supérieure au seuil T8 de température de 0°C. Si la température extérieure T devient inférieure à ce seuil une deuxième pompe 62a, dite pompe de gavage, ajoute à la pression P0 fournie par la première pompe 61a une surpression AP=P1-P0, la pression P1 étant supérieure au seuil P8 d'ouverture des perforations 42b.Figure 3b shows a wiper system with two pumps 61a, 61b supply. A first pump 61a is intended to supply, like the pump 61 of FIG. 3a, a pressure P 0 lower than the threshold P 8 for opening the perforations 42b, when the external temperature T is greater than the temperature threshold T 8 of 0 ° vs. If the outside temperature T falls below this threshold, a second pump 62a, called a booster pump, adds to the pressure P 0 supplied by the first pump 61a an overpressure AP = P 1 -P 0 , the pressure P 1 being greater than the threshold P 8 opening perforations 42b.
[0044] Le graphe de la figure 4 donne en fonction de la température extérieure T le nombre de trous 42a efficaces en traits pointillés, le nombre de PatXML 8/10 WFR1194 PCTThe graph of FIG. 4 gives, as a function of the outside temperature T, the number of holes 42a that are efficient in dotted lines, the number of PatXML 8/10 WFR1194 PCT
perforations 42b efficaces en traits mixtes, et le nombre total d'orifices efficaces en trait continu. La diminution du nombre d'orifices efficaces aux basses températures est due à l'augmentation de la viscosité du liquide de lavage, particulièrement sensible au niveau des orifices les plus éloignés.perforations 42b effective in phantom, and the total number of effective orifices in solid line. The reduction in the number of orifices effective at low temperatures is due to the increase in the viscosity of the washing liquid, which is particularly noticeable at the level of the furthest orifices.
[0045] La figure 5 est une variante de réalisation du moyen complémentaire d'obturation de l'invention.Figure 5 is an alternative embodiment of the complementary closure means of the invention.
[0046] Selon cette variante, le moyen complémentaire 42c d'obturation comprend, d'une part, un trou complémentaire 421c, analogue aux trous 42a de la figure 2, percé à travers la rampe 41 de transport et, d'autre part, un moyen 422c d'obturation du trou 421c constitué, dans l'exemple de la figure 5, par un élément en forme de languette de la paroi de la rampe 41 apte à être appliqué contre le trou 421c sous l'action d'une force de rappel liée à la nature élastique du matériau dans lequel est réalisée la rampe 41.According to this variant, the complementary closure means 42c comprises, on the one hand, a complementary hole 421c, similar to the holes 42a of Figure 2, pierced through the transport ramp 41 and, on the other hand, a means 422c for closing the hole 421c constituted, in the example of FIG. 5, by a tongue-shaped element of the wall of the ramp 41 able to be applied against the hole 421c under the action of a force of return related to the elastic nature of the material in which the ramp 41 is made.
[0047] Lorsque la pression de liquide exerce sur le trou 421c une force supérieure à la force de rappel, l'élément 422c s'écarte de sa position d'obturation et ouvre le trou 421c. Le seuil de pression est donc dans ce cas défini par la pression à appliquer au moyen d'obturation pour exercer une force égale à ladite force de rappel. Lorsque la pression devient inférieure au seuil de pression, l'élément 422c d'obturation se referme sur le trou 421c par effet de charnière élastique. When the liquid pressure exerts on the hole 421c a force greater than the restoring force, the element 422c deviates from its closed position and opens the hole 421c. The pressure threshold is in this case defined by the pressure to be applied to the shutter means to exert a force equal to said restoring force. When the pressure becomes lower than the pressure threshold, the closing element 422c closes on the hole 421c by elastic hinge effect.

Claims

PatXML 9/10 WFR1194 PCTRevendications PatXML 9/10 WFR1194 PCTRevendications
1. Dispositif de distribution et de projection d'un liquide de lavage sur une vitre de véhicule automobile, ledit dispositif comprenant au moins une rampe (41) de transport de liquide percée d'au moins un trou (42a) de projection de liquide de lavage sur ladite vitre, caractérisé en ce que ladite rampe (41) de transport comporte en outre au moins un moyen complémentaire (42b ; 42c) de projection apte à projeter le liquide de lavage sur ladite vitre sous une pression de liquide supérieure à un seuil (P8) de pression donné.1. Apparatus for dispensing and spraying a washing liquid onto a window of a motor vehicle, said device comprising at least one liquid transport ramp (41) pierced with at least one liquid projection hole (42a). washing on said window, characterized in that said transport ramp (41) further comprises at least one complementary projection means (42b; 42c) adapted to project the washing liquid onto said window pane under a liquid pressure greater than a threshold (P 8 ) given pressure.
2. Dispositif de distribution et de projection selon la revendication 1 , dans lequel ledit moyen complémentaire de projection comprend une perforation (42b) réalisée à travers ladite rampe (41) de transport, ledit seuil (P8) de pression de liquide étant sensiblement égal à la pression d'ouverture de ladite perforation (42b).2. Dispensing and projection device according to claim 1, wherein said complementary projection means comprises a perforation (42b) made through said transport ramp (41), said threshold (P 8 ) of liquid pressure being substantially equal at the opening pressure of said perforation (42b).
3. Dispositif de distribution et de projection selon la revendication 1 , dans lequel ledit moyen complémentaire (42c) de projection comprend un trou complémentaire (421c) percé à travers ladite rampe (41) de transport, et un moyen (422c) d'obturation apte à obturer ledit trou complémentaire (421c) sous l'action d'une force de rappel élastique, ledit seuil (P8) de pression étant défini par la pression à appliquer audit moyen (422c) d'obturation pour exercer une force égale à ladite force de rappel élastique.A dispensing and splash device according to claim 1, wherein said complementary projection means (42c) comprises a complementary hole (421c) pierced through said transport ramp (41), and shutter means (422c). adapted to close said complementary hole (421c) under the action of an elastic restoring force, said pressure threshold (P 8 ) being defined by the pressure to be applied to said closing means (422c) to exert a force equal to said elastic restoring force.
4. Dispositif de distribution et de projection selon la revendication 1 , dans lequel, ladite rampe (41) de transport présente une alternance de trou (42a) de projection de liquide et de moyen complémentaire (42b ; 42c) de projection.4. A dispensing device and projection according to claim 1, wherein, said transport ramp (41) has a alternation of hole (42a) of liquid projection and complementary projection means (42b; 42c).
5. Système d'essuyage d'une vitre de véhicule automobile, comportant un dispositif de distribution et de projection selon l'une quelconque des revendications 1 à 4.5. System for wiping a window of a motor vehicle, comprising a distribution and projection device according to any one of claims 1 to 4.
6. Système d'essuyage selon la revendication 5, comprenant un capteur (70) de température destiné à déterminer la pression de liquide de lavage à fournir par au moins une pompe (61 ; 61a, 61 b) d'alimentation en fonction de la température extérieure (T) au véhicule mesurée par ledit capteur (70).A wiper system according to claim 5, comprising a temperature sensor (70) for determining the wash liquid pressure to be supplied by at least one feed pump (61; 61a, 61b) as a function of external temperature (T) to the vehicle measured by said sensor (70).
7. Système d'essuyage selon l'une des revendications 5 ou 6, dans lequel ladite rampe (41) de transport s'étend le long d'un balai d'essuie-glace du système d'essuyage. PatXML 10/10 WFR1194 PCTThe wiper system of one of claims 5 or 6, wherein said transport ramp (41) extends along a wiper blade of the wiper system. PatXML 10/10 WFR1194 PCT
8. Système d'essuyage selon la revendication 7, dans lequel ledit balai d'essuie-glace est un balai plat.The wiper system of claim 7, wherein said wiper blade is a flat mop.
9. Balai d'essuie-glace comportant un dispositif de distribution et de projection selon l'une quelconque des revendications 1 à 4. A windscreen wiper blade having a dispensing and splashing device according to any one of claims 1 to 4.
PCT/EP2009/050487 2008-01-25 2009-01-16 Device for dispensing and spraying a washing liquid onto the window of an automobile and wiper system including such spraying device WO2009092669A1 (en)

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FR0800390 2008-01-25
FR0800390A FR2926765B1 (en) 2008-01-25 2008-01-25 DEVICE FOR PROJECTING A WASHING FLUID OF A GLASS OF A MOTOR VEHICLE AND WIPING SYSTEM COMPRISING SAID DEVICE FOR PROJECTION

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WO2013000657A1 (en) * 2011-06-28 2013-01-03 Robert Bosch Gmbh Wiping device, in particular wiping device for a motor vehicle pane
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EP3144191A1 (en) * 2015-09-15 2017-03-22 Valeo Systèmes d'Essuyage Method for de-icing a vehicle window
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EP3144190A1 (en) * 2015-09-15 2017-03-22 Valeo Systèmes d'Essuyage Method and device for de-icing a vehicle window
FR3040948A1 (en) * 2015-09-15 2017-03-17 Valeo Systemes Dessuyage METHOD AND DEVICE FOR DEFROSTING A VEHICLE GLASS
CN106515666B (en) * 2015-09-15 2019-11-05 法雷奥***公司 Vehicle window de-icing method and equipment
WO2020136079A1 (en) * 2018-12-27 2020-07-02 Robert Bosch Gmbh Wiper blade device

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FR2926765A1 (en) 2009-07-31
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