WO2011039446A1 - Probe for measuring the oil level in a housing of a motor vehicle, consisting of a polymer material - Google Patents

Probe for measuring the oil level in a housing of a motor vehicle, consisting of a polymer material Download PDF

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Publication number
WO2011039446A1
WO2011039446A1 PCT/FR2010/051953 FR2010051953W WO2011039446A1 WO 2011039446 A1 WO2011039446 A1 WO 2011039446A1 FR 2010051953 W FR2010051953 W FR 2010051953W WO 2011039446 A1 WO2011039446 A1 WO 2011039446A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
probe according
measuring probe
socket
cavity
Prior art date
Application number
PCT/FR2010/051953
Other languages
French (fr)
Inventor
Pierre Goderneaux
Eric Moisson
Jean-Pierre Bey
Original Assignee
Sc2N
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 Sc2N filed Critical Sc2N
Publication of WO2011039446A1 publication Critical patent/WO2011039446A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
    • G01F23/242—Mounting arrangements for electrodes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices
    • G01F23/247—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices for discrete levels
    • G01F23/248—Constructional details; Mounting of probes

Definitions

  • the field of the present invention is that of equipment for the automobile, and more particularly that of instruments for controlling the proper functioning of the engine.
  • the invention more specifically relates to an oil level probe.
  • Motor vehicles are designed to operate with a properly lubricated engine, which assumes, among other things, that the engine crankcase maintains a sufficient volume of oil at all times.
  • vehicles have an oil gauging system that is present in this case.
  • Such a system comprises a probe attached to the housing, associated with a dip tube which is immersed in the oil and allows the remaining level to be determined by means of an element sensitive to the height of the liquid carried by the tube.
  • the probe generally comprises a socket fixed on the housing and which passes through a piercing, the sealing being provided for example by O-rings surrounding the socket and interposed between it and the housing wall.
  • This plug serves, on the outside of the housing, mechanical support and electrical connection for a connector that collects information from the sensing element and transmits it to the lubrication monitoring system, which will then shape them for a presentation to the driver or to trigger an alert. It comprises, on the inside of the housing, a connection element to the dip tube.
  • the latter optionally comprises a first portion bent to take into account the shape and orientation of the housing where the plug is located and straighten the rest of the tube to place it in a vertical position in the oil; it thus comprises a second part which extends vertically in the oil until it exceeds the maximum level attainable by the oil.
  • This second part has two opening windows whose height positioning corresponds to the two extreme limits of the level that one wishes to monitor.
  • a resistive electric wire constituting the sensitive element, which starts from the socket and extends by making a return trip in the tube, passing in front of the window furthest from the socket .
  • the wire is thus immersed in the oil, over part of its length which is a function of the level thereof in the housing.
  • the principle of measuring the oil level is based on the measurement of the potential difference between the ends of the wire at the plug, when an electric current of a predefined intensity is injected.
  • the passage of current causes the creation of heat by Joule effect, which dissipates in the environment. The dissipation of this heat is different depending on whether the wire is more or less immersed in the oil.
  • the temperature obtained, resulting from this greater or lesser dissipation acts on the resistivity of the wire and therefore on the voltage that must be applied to the terminals to pass the predefined current.
  • the tube immersed in the oil is made in two parts: a first part is made of metal to meet the requirements of mechanical strength and in particular the vibration requirements which are high because, on the one hand of the vibratory level in the zone considered, on the other hand the relative length of the tube; the second part is made of polymer material for obvious reasons of cost.
  • the first part is fixed on the socket which is made of metallic material, and the second part of the tube is fixed on the first, the two connections being made by crimping the metal.
  • the second part of the tube is in the form of two half-shells, one of which carries the two windows of entry of the oil; this conformation with two shells makes it possible to have access to the wire during its assembly and, among other things, to be able to tension it during its installation, before closing the shells.
  • the two half-shells fit one against the other and their common end located on the side of the metal part of the tube, is positioned in the crimp zone of this first portion of metal material.
  • the object of the present invention is to remedy these drawbacks by proposing an oil level measurement probe in a low cost engine casing which is resistant to vibrational stresses and which ensures proper positioning of the dip tube in the liquid. .
  • the subject of the invention is a sensor for measuring the oil level in an engine casing, comprising a plug for fixing said probe on a wall of said casing and a dip tube carried by said plug, intended to be at least partially immersed in the oil and equipped with a measuring element sensitive to the height of the oil in the housing, characterized in that said dip tube is formed (made) of polymeric material.
  • the merit of the inventors is to overcome the prejudice that one could not manufacture a "all-polymer" tube by providing, contrary to the teaching of the prior art that required that at least a portion of the tube be made of metallic material in the purpose of damping the vibrations, that the whole of this tube is in polymer (one speaks fluently of plastic material).
  • the manufacture of a polymer tube allows a significant reduction in the mass and cost of the probe.
  • the tube comprising an end portion (or distal portion) intended to be at least partly immersed in the oil and a connecting portion between the end portion and the socket, the connecting portion and the terminal portion of the tube are formed (made) of polymeric material.
  • This configuration allows, thanks to the connecting portion, to place the socket at a preferential location on the housing, while maintaining a vertical orientation for the terminal portion.
  • the plug is also formed (made) of polymer material.
  • a connector can be fixed on the socket, outside the housing, by a welding which can be of the type welding by vibration, ultrasonic welding or infrared welding.
  • the end portion has two half-shells nested one inside the other.
  • the invention transgresses even more here the prejudices of the prior art according to which, if the end tube had two half-shells, it was impossible not to support them by a metal coupling portion because of the vibrations to which a casing is subjected. engine.
  • the coupling portion comprises a monoblock tube portion.
  • the connecting portion supports, preferably integrally, a half-shell, a half-shell being adapted to be fitted on the half-shell supported by the connecting portion to form with she the terminal portion.
  • the assembly of the probe is simplified, the connecting portion supporting even before mounting a portion of the end portion.
  • the plunger tube comprises a male end cooperating with a cavity of the socket, the plunger tube being connected to the socket by a plugging force of said male end into said cavity.
  • the plugging force makes it possible to ensure a good maintenance in rotation of the dip tube on the socket. It also ensures a translational hold, avoiding inadvertent withdrawal of the dip tube from the socket.
  • said cavity has an inner surface with a knurled area cooperating with a knurled area of an outer surface of said male end for their engagement in force.
  • the male end has hooking means, said socket comprising holding means adapted to cooperate with said hooking means for holding the male end in the socket.
  • hooking means further improve the translational holding of the dip tube in the cavity.
  • the attachment means comprise lugs projecting from the male end and the receptacle comprises a groove for receiving said lugs.
  • the male endpiece comprises at least one elastically deformable zone for reversibly reducing the section of the male endpiece when introduced into the cavity.
  • the introduction of the tip into the cavity and the passage thereof through the first knurled zone of the latter are optionally facilitated.
  • said deformable zone is made elastically deformable by cuts made in the direction of insertion of the male end into the cavity.
  • the notches are in number equal to the number n of clipping means and offset by ⁇ / ⁇ relative to them.
  • the invention also relates to a motor vehicle engine comprising a housing equipped with an oil level measuring probe as described above and a vehicle equipped with such a motor.
  • FIG. 1 is a partial sectional view of a plug and a dip tube according to the preferred embodiment of the probe of the invention, in front view;
  • FIG. 2 is a perspective view of a dip tube according to the preferred embodiment of the probe of the invention, in profile view;
  • FIGS. 3 and 4 are sectional views, respectively front and side, of a socket for supporting the dip tube of Figure 2 for a measuring probe according to the preferred embodiment of the invention
  • FIGS. 5 and 6 are sectional views, respectively front and side, of the male end of the plunger tube of FIG.
  • FIG. 7 is an isometric view of the male end of the dip tube of FIG.
  • an oil level probe comprising a jack 1 on which is mounted by crimping a first part, called a tube or connecting portion 2, of a dip tube, this first part being it - Same carrier of a second part, said portion or end tube 3.
  • This dip tube is, according to the invention, made entirely of polymer material; in this case therefore, the connecting tube 2, just like the end tube 3, are formed of polymer material.
  • the plunger tube can be formed in one piece.
  • the plug 1 is partially seen in section, as well as the connecting tube 2, while the end tube 3 is shown in front view.
  • the end tube 3 comprises two half-shells of which one, which appears in FIG. 1, comprises two openings, in this case called lower window 4 and upper window 5 because of their position in FIG. penetrate the oil whose level is to be measured.
  • the plug 1 comprises a thread 6 intended to allow its attachment to the wall 7 of the housing in which is the oil whose level is to be measured.
  • the connecting tube 2 is an intermediate piece whose primary function is to ensure correct positioning of the end tube 3, that is to say, in the first place to position it vertically regardless of the orientation of the housing to the where the plug 1 is mounted, and secondly to place it at a height such that the lower window 4 is placed below the lowest oil level that we want measure.
  • the upper window is then, by the choice made when defining the dimensions of the end tube 3, at or above the highest level of oil that is to be measured.
  • the connecting tube 2 fulfills a second vibration damping function between the socket 1 and the end tube 3.
  • the dip tube is traversed by a resistive wire 8, U-shaped, which constitutes the measuring element and which goes back and forth inside the connecting tube 2 and the end tube 3. It is connected to its ends with two contacts 9 and 10 located in the socket, at which the desired voltage measurement takes place, and it extends throughout the entire length of the dip tube, to exceed the height of the upper window 5.
  • the dip tube according to the preferred embodiment of the invention in profile view; it is noted that the junction between the connecting tube 2 and the end tube 3 is bent.
  • the dip tube is shown in the configuration of an upwardly extending tube, the end tube 3 being located above the connecting tube 2 and the dip tube thus dipping into the oil from below; in another embodiment it could be oriented with the end tube located below the connecting tube, the dip tube then dipping into the oil from above.
  • the connecting tube 2 has the function of connecting the end tube 3 to a socket 1 fixed in a wall of the housing 7 containing the oil whose level is to be measured.
  • the connecting tube 2 also makes it possible to position the end tube 3 in a vertical direction at the desired height, bypassing any obstacles in the volume of the casing. Since the connecting tube 2 according to the invention is no longer made of metal but of plastic, it is possible to compensate for the lack of stiffness of the plastic by increasing its thickness relative to that of an equivalent metal tube. The separation of the dip tube into two portions thus makes it possible to stiffen only the connecting portion 2 and to retain the same characteristics, for the end portion 3, as in the prior art.
  • the connecting tube 2 has, at its end connected to the socket 1, in this case its lower end, a male end 21 intended to allow the attachment of the dip tube to a corresponding female portion 11 of the socket 1 and to ensure its holding in position, the socket 1 (not shown in Figure 2) being mounted on the housing 7 by a known fastening device.
  • the male end 21 is in this case cylindrical and therefore extends globally along an axis.
  • the female part 11 of the socket 1 comprises a cavity 12 with a cylindrical portion, for receiving the male end-piece 21, whose internal diameter substantially corresponds to the outside diameter of the male end 21 of the connecting tube 2, the inside diameter of the cavity 12 of the socket 1 being arranged with respect to the outer diameter of the male end 21 in order to impose a forcible engagement for the insertion of the male end 21 into the cavity 12.
  • the inlet of the cavity 12 is flat longitudinally, without this characteristic being imperative, while the bottom of the cavity flares radially so as to create a circular groove 13 whose diameter is greater than that of its cylindrical portion.
  • a chamfer 15 is also present at the bottom of the cavity and forms a connection between the cylindrical portion of the cavity 12 and the groove 13, in order to facilitate the passage of the cylindrical portion of the cavity 12 to its circular groove 13 for means of hooking, such as lugs 22, placed at the insertion end of the male end 21 and which are described in more detail below.
  • the cavity 12 has, along a length, denoted L, of its cylindrical portion, a knurled zone 14, with a knurling which projects slightly inside this cavity 12.
  • the male end 21 has a cylindrical shape complementary to that of the cavity 12 and has on its outer face a knurled zone 24, of a length substantially equal to the length L of the knurled zone 14 of the cavity 12 and positioned facing this knurled zone 14 when the two parts are in position one in the other.
  • the knurling 24 projects slightly towards the outside of the cylinder, the tip 21 of which has the shape, the diameters of the two knurled zones being adapted so as to cause the two parts to be clamped together when the male end 21 is inserted into the cavity 12 of the socket 1, to prevent any rotation of the plunger tube relative to the socket 1; because of the interlocking knurling, any rotation of the male end 21 in the cavity 12 of the socket 1 would indeed cause a seizing knurling 14, 24 against each other, which would prohibit this rotation.
  • the male end 21 has two protuberances or lugs 22, diametrically opposite to the axis of the tip 21, for maintaining the translation of the tip 21.
  • These lugs 22 form hooking means.
  • These lugs 22 project, at the end of the nozzle 21, on its periphery, that is to say that they project out of its cross section.
  • the lugs 22 have a first inclined face (bevel) with respect to a plane perpendicular to the insertion direction of the nozzle 21 in the cavity 12, so as to facilitate the introduction thereof into the cavity 12 of take 1; they also have a stop face perpendicular (transverse) to the axis of the nozzle 21 so as to ensure a locking in translation thereof when it is completely inserted into the cavity 12.
  • the lugs 22 penetrate into the groove 13 and prevent the removal of the tip 21, by the cooperation of the stop face of the lugs 22 with a radially extending face 16 of the groove 13, which thus completes a function of retaining hooking means 22, by abutment of the latter on it.
  • notches 23 In the insertion end of the male end 21 in the cavity 12 are formed two notches 23, diametrically opposite one another and offset by a quarter of a turn relative to the two lugs 22. These notches 23 are through the entire thickness of the nozzle 21 and cut along two generatrices of the cylinder whose tip 21 has the shape; they extend from the end of the nozzle 21 to its knurled portion 24; their length and their width are defined in a manner known to those skilled in the art to give sufficient flexibility to the two remaining half-cylinders (because of the cuts 23), thus defining an elastically deformable zone 25, and to allow the erasure of the lugs 22 during the introduction of the end of the nozzle 21 into the cavity 12 of the socket 1.
  • the operator first mounts the socket 1, alone, on the housing, by a suitable method and conventional for a skilled person.
  • the plug 1 may have been previously provided with its dip tube if it is able to pass through the hole in the wall 7.
  • the dip tube is mounted after the fixing of the socket 1 on the housing 7; the principle of mounting the dip tube on the socket 1 remains unchanged in the case of a prior assembly of the tube on the socket 1.
  • the method of fixing the socket 1 to the wall 7 of the housing can be screwing on a threading on the wall of a hole (piercing) pierced in the thickness of the wall 7 or a plugging force in such a hole. Seals are generally positioned, in known manner, between the socket 1 and the casing wall 7.
  • the connecting tube 2 and the end tube 3 are pre-assembled, with the resistive wire extending from the connection terminals with the contacts 9 and 10, at the bottom of the connecting tube, until the height of the upper window 5 is exceeded.
  • This operation is in this case made possible by the constitution of the end tube 3 which is made in two half-shells, detachable one from the other, and which are assembled (nested) before their common attachment to the connecting tube 2.
  • the connecting tube 2 is made in one piece with one of the two half-shells, a half-shell then being fitted on the half-shell of the connecting tube 2 to form with it the end tube.
  • the operator then approaches the connecting tube 2 of the socket 1 and has the male end 21 in front of the inner cavity 12 of the socket 1. It then engages in force the male end 21 in this cavity 12.
  • the end of the male end 21 then engages in the cavity 12, passes through the knurled zone 14 of the socket 1 and moves forward that the lugs 22 open at the groove 13.
  • the half-cylinders carrying the lugs 22 then resume their position, since they form an elastically deformable zone 25, and engage the stop face of the lugs 22 against the radial extension face 16 of the groove.
  • the two knurled areas 14, 24 of the socket 1 and the nozzle 21 are engaged and cooperate to maintain the nozzle 21 in position in the socket 1; the pressure exerted on the surfaces in contact, associated with the interlocking of the two knurls 14, 24, ensures a good holding of the dip tube on the socket 1 and prevents its rotation.
  • the dip tube is thus maintained both in rotation, by the cooperation of the two knurls 14, 24, and in translation, firstly by the two knurls 14, 24 and then, in a complementary and non-imperative manner, by the cooperation of pins 22 with the radial extension face 16.
  • the male end 21 and the cavity 12 have been represented as cylinders of revolution; they may take any other form, provided that it allows them to be fixed to each other. Preferably, they are arranged to fit one into the other, preferably such that this interlocking is effected by fitting, thus generating a pressure between the surfaces in contact, so as to ensure their joining.
  • the lugs 22, like the notches 23, have been represented in number of two; this number n of lugs 22 may be different from 2, the number of notches 23 then preferably being equal to the number of lugs 22 and each of them being positioned between two lugs 22.
  • the lugs 22 are regularly distributed on the periphery of the nozzle 21 and the notches 23 are offset by ⁇ / ⁇ relative to the lugs 22.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a probe for measuring the oil level in an engine housing, comprising a connection point (1) for fixing said probe to a wall (8) of the housing and a plunger tube (2, 3) carried by the connection point (1), that can be submerged in the oil and is provided with a measuring element (8) sensitive to the height of the oil in the housing. The plunger tube (2, 3) consists of a polymer material. The probe according to the invention is produced at a low cost and is as light as possible.

Description

Sonde de mesure du niveau d'huile dans un carter  Probe for measuring the oil level in a crankcase
d'automobile réalisée en matériau polymère  made of polymer material
Le domaine de la présente invention est celui des équipements pour l'automobile, et plus particulièrement celui des instruments de contrôle du bon fonctionnement du moteur. L'invention concerne plus précisément une sonde de niveau d'huile. The field of the present invention is that of equipment for the automobile, and more particularly that of instruments for controlling the proper functioning of the engine. The invention more specifically relates to an oil level probe.
Les véhicules automobiles sont conçus pour fonctionner avec un moteur correctement lubrifié, ce qui suppose entre autres que le carter moteur conserve en permanence un volume d'huile suffisant. Pour s'assurer du respect de cette condition, les véhicules disposent d'un système de jaugeage de l'huile qui est présente dans ce carter. Un tel système comprend une sonde fixée sur le carter, associée à un tube plongeur qui est immergé dans l'huile et permet de déterminer le niveau restant grâce à un élément sensible à la hauteur du liquide porté par le tube.  Motor vehicles are designed to operate with a properly lubricated engine, which assumes, among other things, that the engine crankcase maintains a sufficient volume of oil at all times. To ensure compliance with this condition, vehicles have an oil gauging system that is present in this case. Such a system comprises a probe attached to the housing, associated with a dip tube which is immersed in the oil and allows the remaining level to be determined by means of an element sensitive to the height of the liquid carried by the tube.
La sonde comporte généralement une prise fixée sur le carter et qui le traverse au niveau d'un perçage, l'étanchéité étant assurée par exemple par des joints toriques entourant la prise et s'intercalant entre elle et la paroi du carter. Cette prise sert, du côté extérieur au carter, de support mécanique et de liaison électrique pour un connecteur qui recueille les informations en provenance de l'élément sensible et les transmet au système de surveillance de la lubrification, qui les mettra alors en forme pour une présentation au conducteur ou pour le déclenchement d'une alerte. Elle comporte, du côté de l'intérieur du carter, un élément de raccordement au tube plongeur. Ce dernier comprend éventuellement une première partie coudée pour tenir compte de la forme et de l'orientation du carter là où se trouve la prise et redresser le reste du tube afin de le placer en position verticale dans l'huile ; il comprend ainsi une seconde partie qui s'étend verticalement dans l'huile jusqu'à dépasser le niveau maximal atteignable par l'huile. Cette seconde partie comporte deux fenêtres d'ouverture dont le positionnement en hauteur correspond aux deux limites extrêmes du niveau que l'on souhaite surveiller.  The probe generally comprises a socket fixed on the housing and which passes through a piercing, the sealing being provided for example by O-rings surrounding the socket and interposed between it and the housing wall. This plug serves, on the outside of the housing, mechanical support and electrical connection for a connector that collects information from the sensing element and transmits it to the lubrication monitoring system, which will then shape them for a presentation to the driver or to trigger an alert. It comprises, on the inside of the housing, a connection element to the dip tube. The latter optionally comprises a first portion bent to take into account the shape and orientation of the housing where the plug is located and straighten the rest of the tube to place it in a vertical position in the oil; it thus comprises a second part which extends vertically in the oil until it exceeds the maximum level attainable by the oil. This second part has two opening windows whose height positioning corresponds to the two extreme limits of the level that one wishes to monitor.
A l'intérieur de ce tube est déroulé un fil électrique résistif, constituant l'élément sensible, qui part de la prise et s'étend en effectuant un aller et retour dans le tube, en passant devant la fenêtre la plus éloignée de la prise. Le fil est ainsi immergé dans l'huile, sur une partie de sa longueur qui est fonction du niveau de celle-ci dans le carter. Le principe de mesure du niveau d'huile repose sur la mesure de la différence de potentiel existant entre les extrémités du fil au niveau de la prise, lorsqu'on y injecte un courant électrique d'une intensité prédéfinie. Le passage du courant provoque la création de chaleur par effet Joule, qui se dissipe dans le milieu ambiant. La dissipation de cette chaleur est différente selon que le fil est plus ou moins immergé dans l'huile. La température obtenue, résultant de cette plus ou moins grande dissipation, agit sur la résistivité du fil et donc sur la tension qu'il faut appliquer aux bornes pour faire passer le courant prédéfini. Inside this tube is unwound a resistive electric wire, constituting the sensitive element, which starts from the socket and extends by making a return trip in the tube, passing in front of the window furthest from the socket . The wire is thus immersed in the oil, over part of its length which is a function of the level thereof in the housing. The principle of measuring the oil level is based on the measurement of the potential difference between the ends of the wire at the plug, when an electric current of a predefined intensity is injected. The passage of current causes the creation of heat by Joule effect, which dissipates in the environment. The dissipation of this heat is different depending on whether the wire is more or less immersed in the oil. The temperature obtained, resulting from this greater or lesser dissipation, acts on the resistivity of the wire and therefore on the voltage that must be applied to the terminals to pass the predefined current.
Dans les sondes connues, le tube plongé dans l'huile est réalisé en deux parties : une première partie est réalisée en métal pour répondre aux exigences de tenue mécanique et notamment aux exigences vibratoires qui sont élevées du fait, d'une part du niveau vibratoire dans la zone considérée, d'autre part de la longueur relative du tube ; la seconde partie est réalisée en matériau polymère pour des raisons évidentes de coût. La première partie est fixée sur la prise qui est en matériau métallique, et la seconde partie du tube est fixée sur la première, les deux liaisons étant réalisées par sertissage du métal. La seconde partie du tube se présente sous la forme de deux demi-coquilles, dont l'une porte les deux fenêtres d'entrée de l'huile; cette conformation avec deux coquilles permet d'avoir accès au fil lors de son montage et, entre autres, de pouvoir le tendre lors de sa mise en place, avant fermeture des coquilles. Les deux demi-coquilles s'emboîtent l'une contre l'autre et leur extrémité commune située du côté de la partie métallique du tube, est positionnée dans la zone à sertir de cette première partie en matériau métallique.  In the known probes, the tube immersed in the oil is made in two parts: a first part is made of metal to meet the requirements of mechanical strength and in particular the vibration requirements which are high because, on the one hand of the vibratory level in the zone considered, on the other hand the relative length of the tube; the second part is made of polymer material for obvious reasons of cost. The first part is fixed on the socket which is made of metallic material, and the second part of the tube is fixed on the first, the two connections being made by crimping the metal. The second part of the tube is in the form of two half-shells, one of which carries the two windows of entry of the oil; this conformation with two shells makes it possible to have access to the wire during its assembly and, among other things, to be able to tension it during its installation, before closing the shells. The two half-shells fit one against the other and their common end located on the side of the metal part of the tube, is positioned in the crimp zone of this first portion of metal material.
L'utilisation de ces sondes, du fait du choix du métal pour leur réalisation et de l'opération de sertissage, se traduit par un coût relativement élevé. Le remplacement du métal par un matériau polymère se heurte au problème du niveau vibratoire à soutenir et du mode de fixation du tube sur la prise, le sertissage n'étant plus envisageable. Le mode de fixation doit en effet garantir l'absence de rotation du tube par rapport à la prise, car sa position angulaire conditionne le positionnement vertical de la seconde partie du tube plongeur.  The use of these probes, because of the choice of the metal for their realization and the crimping operation, results in a relatively high cost. The replacement of the metal with a polymer material encounters the problem of the vibratory level to be supported and the method of fixing the tube to the socket, crimping being no longer possible. The method of attachment must indeed guarantee the absence of rotation of the tube relative to the plug, because its angular position conditions the vertical positioning of the second portion of the dip tube.
La présente invention a pour but de remédier à ces inconvénients en proposant une sonde de mesure du niveau d'huile dans un carter de moteur, de faible coût, qui soit résistante aux sollicitations vibratoires et qui assure un bon positionnement du tube plongeur dans le liquide.  The object of the present invention is to remedy these drawbacks by proposing an oil level measurement probe in a low cost engine casing which is resistant to vibrational stresses and which ensures proper positioning of the dip tube in the liquid. .
A cet effet, l'invention a pour objet une sonde de mesure du niveau d'huile dans un carter de moteur, comportant une prise de fixation de ladite sonde sur une paroi dudit carter et un tube plongeur porté par ladite prise, destiné à être au moins en partie immergé dans l'huile et équipé d'un élément de mesure sensible à la hauteur de l'huile dans le carter, caractérisée en ce que ledit tube plongeur est formé (réalisé) en matériau polymère. Le mérite des inventeurs est de vaincre le préjugé selon lequel on ne pouvait fabriquer un tube "tout polymère" en prévoyant, contrairement à l'enseignement de l'art antérieur qui exigeait qu'au moins une partie du tube soit en matériau métallique dans le but d'amortir les vibrations, que l'ensemble de ce tube soit en polymère (on parle couramment de matière plastique). La fabrication d'un tube en polymère permet une réduction importante de la masse et du coût de la sonde. For this purpose, the subject of the invention is a sensor for measuring the oil level in an engine casing, comprising a plug for fixing said probe on a wall of said casing and a dip tube carried by said plug, intended to be at least partially immersed in the oil and equipped with a measuring element sensitive to the height of the oil in the housing, characterized in that said dip tube is formed (made) of polymeric material. The merit of the inventors is to overcome the prejudice that one could not manufacture a "all-polymer" tube by providing, contrary to the teaching of the prior art that required that at least a portion of the tube be made of metallic material in the purpose of damping the vibrations, that the whole of this tube is in polymer (one speaks fluently of plastic material). The manufacture of a polymer tube allows a significant reduction in the mass and cost of the probe.
Selon une forme préférée de réalisation le tube comportant une portion terminale (ou distale) destinée à être au moins en partie immergée dans l'huile et une portion de raccord entre la portion terminale et la prise, la portion de raccord et la portion terminale du tube sont formées (réalisées) en matériau polymère.  According to a preferred embodiment, the tube comprising an end portion (or distal portion) intended to be at least partly immersed in the oil and a connecting portion between the end portion and the socket, the connecting portion and the terminal portion of the tube are formed (made) of polymeric material.
Cette configuration permet, grâce à la portion de raccord, de placer la prise à un endroit préférentiel sur le carter, tout en gardant une orientation verticale pour la portion terminale.  This configuration allows, thanks to the connecting portion, to place the socket at a preferential location on the housing, while maintaining a vertical orientation for the terminal portion.
Préférentiellement la prise est également formée (réalisée) en matériau polymère. Dans ce cas un connecteur peut être fixé sur la prise, à l'extérieur du carter, par un soudage qui peut être du type soudage par vibrations, soudage par ultrasons ou soudage par infrarouge.  Preferably the plug is also formed (made) of polymer material. In this case a connector can be fixed on the socket, outside the housing, by a welding which can be of the type welding by vibration, ultrasonic welding or infrared welding.
L'utilisation de matériau polymère pour la prise également permet d'accroître encore la réduction du coût et de la masse de la sonde.  The use of polymer material for setting also makes it possible to further increase the reduction in the cost and mass of the probe.
Selon une forme de réalisation préférée, la portion terminale comporte deux demi-coquilles emboîtées l'une dans l'autre.  According to a preferred embodiment, the end portion has two half-shells nested one inside the other.
L'invention transgresse encore plus ici les préjugés de l'art antérieur selon lesquels, si le tube terminal comportait deux demi-coquilles, il était impossible de ne pas les supporter par une portion de raccord métallique en raison des vibrations auxquelles est soumis un carter de moteur.  The invention transgresses even more here the prejudices of the prior art according to which, if the end tube had two half-shells, it was impossible not to support them by a metal coupling portion because of the vibrations to which a casing is subjected. engine.
Selon une forme de réalisation préférée, la portion de raccord comporte une portion de tube monobloc.  According to a preferred embodiment, the coupling portion comprises a monoblock tube portion.
Une telle portion de tube monobloc peut amortir les vibrations. Selon une forme de réalisation préférée dans ce cas, la portion de raccord supporte, de préférence de manière monobloc, une demi-coquille, une demi-coquille étant apte à être emboîtée sur la demi-coquille supportée par la portion de raccord pour former avec elle la portion terminale.  Such a portion of integral tube can dampen vibrations. According to a preferred embodiment in this case, the connecting portion supports, preferably integrally, a half-shell, a half-shell being adapted to be fitted on the half-shell supported by the connecting portion to form with she the terminal portion.
Ainsi, le montage de la sonde est simplifié, la portion de raccord supportant avant même le montage une partie de la portion terminale. De façon préférentielle, le tube plongeur comporte un embout mâle coopérant avec une cavité de la prise, le tube plongeur étant relié à la prise par un emmanchage en force dudit embout mâle dans ladite cavité. Thus, the assembly of the probe is simplified, the connecting portion supporting even before mounting a portion of the end portion. Preferably, the plunger tube comprises a male end cooperating with a cavity of the socket, the plunger tube being connected to the socket by a plugging force of said male end into said cavity.
L'emmanchage en force permet d'assurer un bon maintien en rotation du tube plongeur sur la prise. Il assure également un maintien en translation, évitant un retrait intempestif du tube plongeur de la prise.  The plugging force makes it possible to ensure a good maintenance in rotation of the dip tube on the socket. It also ensures a translational hold, avoiding inadvertent withdrawal of the dip tube from the socket.
Préférentiellement ladite cavité présente une surface interne avec une zone moletée coopérant avec une zone moletée d'une surface externe dudit embout mâle pour leur emmanchage en force.  Preferably said cavity has an inner surface with a knurled area cooperating with a knurled area of an outer surface of said male end for their engagement in force.
L'utilisation de moletages garantit un bon maintien du tube plongeur dans la cavité, contre toute translation intempestive du tube et surtout contre toute rotation.  The use of knurling ensures a good maintenance of the dip tube in the cavity, against inadvertent translation of the tube and especially against any rotation.
Dans un mode particulier de réalisation l'embout mâle comporte des moyens d'accrochage, ladite prise comportant des moyens de retenue aptes à coopérer avec lesdits moyens d'accrochage pour le maintien de l'embout mâle dans la prise.  In a particular embodiment, the male end has hooking means, said socket comprising holding means adapted to cooperate with said hooking means for holding the male end in the socket.
Ces moyens d'accrochage améliorent encore la tenue en translation du tube plongeur dans la cavité.  These hooking means further improve the translational holding of the dip tube in the cavity.
De façon préférentielle les moyens d'accrochage comportent des ergots en saillie de l'embout mâle et la prise comporte une gorge de réception desdits ergots.  Preferably, the attachment means comprise lugs projecting from the male end and the receptacle comprises a groove for receiving said lugs.
Avantageusement l'embout mâle comporte au moins une zone déformable élastiquement permettant de réduire de façon réversible la section de l'embout mâle lors de son introduction dans la cavité. L'introduction de l'embout dans la cavité et le passage de celui-ci au travers de la première zone moletée de cette dernière en sont le cas échéant facilités.  Advantageously, the male endpiece comprises at least one elastically deformable zone for reversibly reducing the section of the male endpiece when introduced into the cavity. The introduction of the tip into the cavity and the passage thereof through the first knurled zone of the latter are optionally facilitated.
Dans un mode particulier de réalisation ladite zone déformable est rendue élastiquement déformable par des entailles pratiquées selon la direction d'introduction de l'embout mâle dans la cavité.  In a particular embodiment, said deformable zone is made elastically deformable by cuts made in the direction of insertion of the male end into the cavity.
Préférentiellement les entailles sont en nombre égal au nombre n de moyens d'accrochages et décalées de π/η par rapport à eux.  Preferably, the notches are in number equal to the number n of clipping means and offset by π / η relative to them.
L'invention concerne également un moteur de véhicule automobile comprenant un carter équipé d'une sonde de mesure du niveau d'huile telle que décrite ci-dessus et un véhicule équipé d'un tel moteur.  The invention also relates to a motor vehicle engine comprising a housing equipped with an oil level measuring probe as described above and a vehicle equipped with such a motor.
L'invention sera mieux comprise, et d'autres buts, détails, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative détaillée qui va suivre, d'une forme de réalisation de l'invention donnée à titre d'exemple purement illustratif et non limitatif, en référence aux dessins schématiques annexés. The invention will be better understood, and other objects, details, features and advantages thereof will become more apparent in the following detailed explanatory description of an embodiment of the invention given to As a purely illustrative and non-limiting example, with reference to the accompanying schematic drawings.
Sur ces dessins :  On these drawings:
- la figure 1 est une vue en coupe partielle d'une prise et d'un tube plongeur selon la forme de réalisation préférée de la sonde de l'invention, en vue de face ;  - Figure 1 is a partial sectional view of a plug and a dip tube according to the preferred embodiment of the probe of the invention, in front view;
- la figure 2 est une vue en perspective d'un tube plongeur selon la forme de réalisation préférée de la sonde de l'invention, en vue de profil ;  FIG. 2 is a perspective view of a dip tube according to the preferred embodiment of the probe of the invention, in profile view;
- les figures 3 et 4 sont des vues en coupe, respectivement de face et de côté, d'une prise servant de support au tube plongeur de la figure 2 pour une sonde de mesure selon la forme de réalisation préférée de l'invention ;  - Figures 3 and 4 are sectional views, respectively front and side, of a socket for supporting the dip tube of Figure 2 for a measuring probe according to the preferred embodiment of the invention;
- les figures 5 et 6 sont des vues en coupe, respectivement de face et de côté, de l'embout mâle du tube plongeur de la figure 2 et  FIGS. 5 and 6 are sectional views, respectively front and side, of the male end of the plunger tube of FIG.
- la figure 7 est une vue isométrique de l'embout mâle du tube plongeur de la figure 2.  FIG. 7 is an isometric view of the male end of the dip tube of FIG.
En se référant à la figure 1, on voit une sonde de niveau d'huile comprenant une prise 1 sur laquelle est montée par sertissage une première partie, dite tube ou portion de raccord 2, d'un tube plongeur, cette première partie étant elle- même porteuse d'une seconde partie, dite portion ou tube terminal 3. Ce tube plongeur est, selon l'invention, réalisé entièrement en matériau polymère; en l'espèce donc, le tube de raccord 2, tout comme le tube terminal 3, sont formés en matériau polymère. Selon une forme de réalisation alternative non représentée, le tube plongeur peut être formé d'une seule pièce.  Referring to FIG. 1, an oil level probe comprising a jack 1 on which is mounted by crimping a first part, called a tube or connecting portion 2, of a dip tube, this first part being it - Same carrier of a second part, said portion or end tube 3. This dip tube is, according to the invention, made entirely of polymer material; in this case therefore, the connecting tube 2, just like the end tube 3, are formed of polymer material. According to an alternative embodiment not shown, the plunger tube can be formed in one piece.
Sur la figure 1 , la prise 1 est vue partiellement en coupe, de même que le tube de raccord 2, alors que le tube terminal 3 est montré en vue de face. Le tube terminal 3 comporte deux demi-coquilles dont l'une, qui apparaît sur la figure 1, comporte deux ouvertures, en l'espèce dénommées fenêtre inférieure 4 et fenêtre supérieure 5 en raison de leur position sur la figure 1, par lesquelles peut pénétrer l'huile dont le niveau est à mesurer.  In Figure 1, the plug 1 is partially seen in section, as well as the connecting tube 2, while the end tube 3 is shown in front view. The end tube 3 comprises two half-shells of which one, which appears in FIG. 1, comprises two openings, in this case called lower window 4 and upper window 5 because of their position in FIG. penetrate the oil whose level is to be measured.
La prise 1 comporte un filetage 6 destiné à permettre sa fixation sur la paroi 7 du carter dans lequel se trouve l'huile dont le niveau est à mesurer. Le tube de raccord 2 est une pièce intermédiaire qui a pour première fonction d'assurer un positionnement correct du tube terminal 3, c'est-à-dire, en premier lieu de le positionner verticalement quelle que soit l'orientation du carter à l'endroit où se monte la prise 1, et en second lieu de le placer à une hauteur telle que la fenêtre inférieure 4 soit placée en dessous du plus bas niveau d'huile que l'on veuille mesurer. La fenêtre supérieure se trouve alors, par le choix effectué lors de la définition des dimensions du tube terminal 3, au niveau ou au-dessus du plus haut niveau d'huile que l'on veut mesurer. Le tube de raccord 2 remplit une deuxième fonction d'amortissement des vibrations entre la prise 1 et le tube terminal 3. The plug 1 comprises a thread 6 intended to allow its attachment to the wall 7 of the housing in which is the oil whose level is to be measured. The connecting tube 2 is an intermediate piece whose primary function is to ensure correct positioning of the end tube 3, that is to say, in the first place to position it vertically regardless of the orientation of the housing to the where the plug 1 is mounted, and secondly to place it at a height such that the lower window 4 is placed below the lowest oil level that we want measure. The upper window is then, by the choice made when defining the dimensions of the end tube 3, at or above the highest level of oil that is to be measured. The connecting tube 2 fulfills a second vibration damping function between the socket 1 and the end tube 3.
Le tube plongeur est parcouru par un fil résistif 8, en forme de U, qui constitue l'élément de mesure et qui effectue un aller et retour à l'intérieur du tube de raccord 2 et du tube terminal 3. Il est relié à ses extrémités à deux contacts 9 et 10 situés dans la prise, au niveau desquels s'effectue la mesure de tension recherchée, et il s'étend dans toute la longueur du tube plongeur, jusqu'à dépasser la hauteur de la fenêtre supérieure 5.  The dip tube is traversed by a resistive wire 8, U-shaped, which constitutes the measuring element and which goes back and forth inside the connecting tube 2 and the end tube 3. It is connected to its ends with two contacts 9 and 10 located in the socket, at which the desired voltage measurement takes place, and it extends throughout the entire length of the dip tube, to exceed the height of the upper window 5.
En se référant maintenant à la figure 2 on voit le tube plongeur selon la forme de réalisation préférée de l'invention en vue de profil; on note que la jonction entre le tube de raccord 2 et le tube terminal 3 est coudée. Le tube plongeur est représenté dans la configuration d'un tube s'étendant vers le haut, le tube terminal 3 étant située au dessus du tube de raccord 2 et le tube plongeur plongeant donc dans l'huile par le bas ; dans une autre forme de réalisation il pourrait être orienté avec le tube terminal situé en dessous du tube de raccord, le tube plongeur plongeant alors dans l'huile par le haut.  Referring now to Figure 2 we see the dip tube according to the preferred embodiment of the invention in profile view; it is noted that the junction between the connecting tube 2 and the end tube 3 is bent. The dip tube is shown in the configuration of an upwardly extending tube, the end tube 3 being located above the connecting tube 2 and the dip tube thus dipping into the oil from below; in another embodiment it could be oriented with the end tube located below the connecting tube, the dip tube then dipping into the oil from above.
De nouveau, le tube de raccord 2 a pour fonction de raccorder le tube terminal 3 à une prise 1 fixée dans une paroi du carter 7 contenant l'huile dont le niveau est à mesurer. Le tube de raccord 2 permet par ailleurs de positionner le tube terminal 3 dans une direction verticale, à la hauteur recherchée, en contournant d'éventuels obstacles dans le volume du carter. Le tube de raccord 2 selon l'invention n'étant plus en métal mais en plastique, on peut compenser le manque de raideur du plastique en augmentant son épaisseur par rapport à celle d'un tube équivalent en métal. La séparation du tube plongeur en deux portions permet ainsi de ne rigidifîer que la portion de raccord 2 et de conserver les mêmes caractéristiques, pour la portion terminale 3, que dans l'art antérieur.  Again, the connecting tube 2 has the function of connecting the end tube 3 to a socket 1 fixed in a wall of the housing 7 containing the oil whose level is to be measured. The connecting tube 2 also makes it possible to position the end tube 3 in a vertical direction at the desired height, bypassing any obstacles in the volume of the casing. Since the connecting tube 2 according to the invention is no longer made of metal but of plastic, it is possible to compensate for the lack of stiffness of the plastic by increasing its thickness relative to that of an equivalent metal tube. The separation of the dip tube into two portions thus makes it possible to stiffen only the connecting portion 2 and to retain the same characteristics, for the end portion 3, as in the prior art.
Le tube de raccord 2 présente, à son extrémité reliée à la prise 1, en l'espèce son extrémité inférieure, un embout mâle 21 destiné à permettre la fixation du tube plongeur sur une partie femelle 11 correspondante de la prise 1 et à assurer ainsi son maintien en position, la prise 1 (non représentée sur la figure 2) étant montée sur le carter 7 par un dispositif de fixation connu. L'embout mâle 21 est en l'espèce de forme cylindrique et s'étend donc globalement suivant un axe.  The connecting tube 2 has, at its end connected to the socket 1, in this case its lower end, a male end 21 intended to allow the attachment of the dip tube to a corresponding female portion 11 of the socket 1 and to ensure its holding in position, the socket 1 (not shown in Figure 2) being mounted on the housing 7 by a known fastening device. The male end 21 is in this case cylindrical and therefore extends globally along an axis.
En se référant aux figures 3 à 6 on voit le détail des moyens d'assemblage de l'embout mâle 21 du tube de raccord 2 sur la partie femelle 11 de la prise 1. La partie femelle 11 de la prise 1 comporte une cavité 12 avec une portion cylindrique, de réception de l'embout mâle 21, dont le diamètre intérieur correspond sensiblement au diamètre extérieur de l'embout mâle 21 du tube de raccord 2, le diamètre intérieur de la cavité 12 de la prise 1 étant agencé par rapport au diamètre extérieur de l'embout mâle 21 afin d'imposer un emmanchage en force pour l'introduction de l'embout mâle 21 dans la cavité 12. Referring to Figures 3 to 6 we see the detail of the assembly means of the male end 21 of the connecting tube 2 on the female part 11 of the socket 1. The female part 11 of the socket 1 comprises a cavity 12 with a cylindrical portion, for receiving the male end-piece 21, whose internal diameter substantially corresponds to the outside diameter of the male end 21 of the connecting tube 2, the inside diameter of the cavity 12 of the socket 1 being arranged with respect to the outer diameter of the male end 21 in order to impose a forcible engagement for the insertion of the male end 21 into the cavity 12.
L'entrée de la cavité 12 est plane longitudinalement, sans que cette caractéristique soit impérative, alors que le fond de la cavité s'évase radialement de façon à créer une gorge circulaire 13 dont le diamètre est plus grand que celui de sa partie cylindrique. Un chanfrein 15 est également présent en fond de cavité et forme un raccord entre la portion cylindrique de la cavité 12 et la gorge 13, afin de faciliter la passage de la portion cylindrique de la cavité 12 à sa gorge circulaire 13 pour des moyens d'accrochage, tels que des ergots 22, placés à l'extrémité d'introduction de l'embout mâle 21 et qui sont décrits plus en détails plus bas. La cavité 12 possède, sur une longueur, notée L, de sa portion cylindrique, une zone moletée 14, avec un moletage qui fait légèrement saillie à l'intérieur de cette cavité 12.  The inlet of the cavity 12 is flat longitudinally, without this characteristic being imperative, while the bottom of the cavity flares radially so as to create a circular groove 13 whose diameter is greater than that of its cylindrical portion. A chamfer 15 is also present at the bottom of the cavity and forms a connection between the cylindrical portion of the cavity 12 and the groove 13, in order to facilitate the passage of the cylindrical portion of the cavity 12 to its circular groove 13 for means of hooking, such as lugs 22, placed at the insertion end of the male end 21 and which are described in more detail below. The cavity 12 has, along a length, denoted L, of its cylindrical portion, a knurled zone 14, with a knurling which projects slightly inside this cavity 12.
Pour sa part, l'embout mâle 21 a une forme cylindrique complémentaire à celle de la cavité 12 et présente sur sa face externe une zone moletée 24, d'une longueur sensiblement égale à la longueur L de la zone moletée 14 de la cavité 12 et positionnée en regard de cette zone moletée 14 lorsque les deux pièces sont en position l'une dans l'autre. Le moletage 24 fait, ici, légèrement saillie vers l'extérieur du cylindre dont l'embout 21 a la forme, les diamètres des deux zones moletées étant adaptés de façon à générer un serrage l'une contre l'autre des deux pièces lorsque l'embout mâle 21 est inséré dans la cavité 12 de la prise 1, afin d'empêcher toute rotation du tube plongeur par rapport à la prise 1 ; du fait de l'imbrication des moletages, toute rotation de l'embout mâle 21 dans la cavité 12 de la prise 1 engendrerait en effet un grippage des moletages 14, 24 l'un contre l'autre, qui interdirait cette rotation.  For its part, the male end 21 has a cylindrical shape complementary to that of the cavity 12 and has on its outer face a knurled zone 24, of a length substantially equal to the length L of the knurled zone 14 of the cavity 12 and positioned facing this knurled zone 14 when the two parts are in position one in the other. Here, the knurling 24 projects slightly towards the outside of the cylinder, the tip 21 of which has the shape, the diameters of the two knurled zones being adapted so as to cause the two parts to be clamped together when the male end 21 is inserted into the cavity 12 of the socket 1, to prevent any rotation of the plunger tube relative to the socket 1; because of the interlocking knurling, any rotation of the male end 21 in the cavity 12 of the socket 1 would indeed cause a seizing knurling 14, 24 against each other, which would prohibit this rotation.
A son extrémité d'introduction dans la cavité 12, l'embout mâle 21 présente deux excroissances ou ergots 22, diamétralement opposées par rapport à l'axe de l'embout 21, de maintien en translation de l'embout 21. Ces ergots 22 forment moyens d'accrochage. Ces ergots 22 font saillie, à l'extrémité de l'embout 21, sur sa périphérie, c'est-à-dire qu'ils sont en saillie hors de sa section transversale. Les ergots 22 présentent une première face inclinée (en biseau) par rapport à un plan perpendiculaire à la direction d'introduction de l'embout 21 dans la cavité 12, de façon à faciliter l'introduction de celui-ci dans la cavité 12 de la prise 1 ; ils présentent en outre une face d'arrêt perpendiculaire (transversale) à l'axe de l'embout 21 de façon à assurer un blocage en translation de celui-ci lorsqu'il est complètement introduit dans la cavité 12. Lorsque l'embout 21 se trouve dans cette position les ergots 22 pénètrent dans la gorge 13 et empêche le retrait de l'embout 21, par la coopération de la face d'arrêt des ergots 22 avec une face d'extension radiale 16 de la gorge 13, qui remplit ainsi une fonction de retenue des moyens d'accrochage 22, par butée de ces derniers sur elle. At its insertion end in the cavity 12, the male end 21 has two protuberances or lugs 22, diametrically opposite to the axis of the tip 21, for maintaining the translation of the tip 21. These lugs 22 form hooking means. These lugs 22 project, at the end of the nozzle 21, on its periphery, that is to say that they project out of its cross section. The lugs 22 have a first inclined face (bevel) with respect to a plane perpendicular to the insertion direction of the nozzle 21 in the cavity 12, so as to facilitate the introduction thereof into the cavity 12 of take 1; they also have a stop face perpendicular (transverse) to the axis of the nozzle 21 so as to ensure a locking in translation thereof when it is completely inserted into the cavity 12. When the tip 21 is in this position, the lugs 22 penetrate into the groove 13 and prevent the removal of the tip 21, by the cooperation of the stop face of the lugs 22 with a radially extending face 16 of the groove 13, which thus completes a function of retaining hooking means 22, by abutment of the latter on it.
Dans l'extrémité d'introduction de l'embout mâle 21 dans la cavité 12 sont ménagées deux entailles 23, diamétralement opposées l'une de l'autre et décalées d'un quart de tour par rapport aux deux ergots 22. Ces entailles 23 sont traversantes sur toute l'épaisseur de l'embout 21 et découpées selon deux génératrices du cylindre dont l'embout 21 a la forme; elles s'étendent depuis l'extrémité de l'embout 21 jusqu'à sa partie moletée 24; leur longueur et leur largeur sont définies de façon connue par l'homme du métier pour donner une souplesse suffisante aux deux demi-cylindres restants (du fait des entailles 23), définissant ainsi une zone élastiquement déformable 25, et permettre l'effacement des ergots 22 lors de l'introduction de l'extrémité de l'embout 21 dans la cavité 12 de la prise 1.  In the insertion end of the male end 21 in the cavity 12 are formed two notches 23, diametrically opposite one another and offset by a quarter of a turn relative to the two lugs 22. These notches 23 are through the entire thickness of the nozzle 21 and cut along two generatrices of the cylinder whose tip 21 has the shape; they extend from the end of the nozzle 21 to its knurled portion 24; their length and their width are defined in a manner known to those skilled in the art to give sufficient flexibility to the two remaining half-cylinders (because of the cuts 23), thus defining an elastically deformable zone 25, and to allow the erasure of the lugs 22 during the introduction of the end of the nozzle 21 into the cavity 12 of the socket 1.
On va maintenant décrire le montage d'une sonde de mesure de niveau d'huile selon la forme de réalisation décrite de l'invention, sur un carter de rétention d'huile.  The assembly of an oil level measuring probe according to the described embodiment of the invention will now be described on an oil retention housing.
L'opérateur monte tout d'abord la prise 1, seule, sur le carter, par un procédé approprié et classique pour un homme du métier. La prise 1 peut avoir été préalablement munie de son tube plongeur si celui-ci est apte à passer par le trou pratiqué dans la paroi 7. Dans la suite de la description il est supposé que le tube plongeur est monté postérieurement à la fixation de la prise 1 sur le carter 7 ; le principe de montage du tube plongeur sur la prise 1 reste inchangé dans le cas d'un assemblage préalable du tube sur la prise 1. Le procédé de fixation de la prise 1 à la paroi 7 du carter peut être le vissage sur un filetage pratiqué sur la paroi d'un trou (perçage) percé dans l'épaisseur de la paroi 7 ou bien un emmanchage en force dans un tel trou. Des joints d'étanchéité sont généralement positionnés, de façon connue, entre la prise 1 et la paroi du carter 7.  The operator first mounts the socket 1, alone, on the housing, by a suitable method and conventional for a skilled person. The plug 1 may have been previously provided with its dip tube if it is able to pass through the hole in the wall 7. In the following description it is assumed that the dip tube is mounted after the fixing of the socket 1 on the housing 7; the principle of mounting the dip tube on the socket 1 remains unchanged in the case of a prior assembly of the tube on the socket 1. The method of fixing the socket 1 to the wall 7 of the housing can be screwing on a threading on the wall of a hole (piercing) pierced in the thickness of the wall 7 or a plugging force in such a hole. Seals are generally positioned, in known manner, between the socket 1 and the casing wall 7.
Le tube de raccord 2 et le tube terminal 3 sont pré-assemblés, avec le fil résistif s'étendant des bornes de connexion avec les contacts 9 et 10, en pied du tube de raccord, jusqu'à dépasser en hauteur la fenêtre supérieure 5. Cette opération est en l'espèce rendue possible par la constitution du tube terminal 3 qui est réalisé en deux demi-coquilles, détachables l'une de l'autre, et qui sont assemblées (emboîtées) avant leur fixation commune sur le tube de raccord 2. The connecting tube 2 and the end tube 3 are pre-assembled, with the resistive wire extending from the connection terminals with the contacts 9 and 10, at the bottom of the connecting tube, until the height of the upper window 5 is exceeded. This operation is in this case made possible by the constitution of the end tube 3 which is made in two half-shells, detachable one from the other, and which are assembled (nested) before their common attachment to the connecting tube 2.
Dans une forme particulière de réalisation le tube de raccord 2 est réalisé de façon monobloc avec l'une des deux demi-coquilles, une demi-coquille étant alors emboîtée sur la demi-coquille du tube de raccord 2 pour former avec elle le tube terminal 3.  In a particular embodiment, the connecting tube 2 is made in one piece with one of the two half-shells, a half-shell then being fitted on the half-shell of the connecting tube 2 to form with it the end tube. 3.
L'opérateur approche ensuite le tube de raccord 2 de la prise 1 et présente l'embout mâle 21 en face de la cavité intérieure 12 de la prise 1. Il emmanche alors en force l'embout mâle 21 dans cette cavité 12. La pression exercée sur les ergots 22 lors de l'appui de l'embout 21 sur la face d'introduction de la cavité 12, associée à leur forme en biseau, les force à rentrer vers l'intérieur de la cavité 12, ce qui est rendu possible par la flexibilité générée par les entailles 23 ménagées dans l'embout 21; ainsi, l'embout mâle 21 se déforme élastiquement pour pouvoir passer dans la cavité 12. L'extrémité de l'embout mâle 21 s'engage alors dans la cavité 12, traverse la zone moletée 14 de la prise 1 et s'avance jusqu'à ce que les ergots 22 débouchent au niveau de la gorge 13. Les demi-cylindres porteurs des ergots 22 reprennent alors leur position, puisqu'ils forment une zone déformable élastiquement 25, et engagent la face d'arrêt des ergots 22 contre la face d'extension radiale 16 de la gorge. Dans cette position les deux zones moletées 14, 24 de la prise 1 et de l'embout 21 se trouvent en prise et coopèrent pour maintenir l'embout 21 en position dans la prise 1 ; la pression exercée sur les surfaces en contact, associée à l'imbrication des deux moletages 14, 24, assure une bonne tenue du tube plongeur sur la prise 1 et empêche sa rotation.  The operator then approaches the connecting tube 2 of the socket 1 and has the male end 21 in front of the inner cavity 12 of the socket 1. It then engages in force the male end 21 in this cavity 12. The pressure exerted on the lugs 22 during the support of the nozzle 21 on the insertion face of the cavity 12, associated with their beveled shape, forces them to return towards the interior of the cavity 12, which is rendered possible by the flexibility generated by the notches 23 formed in the tip 21; thus, the male end 21 is deformed elastically to be able to pass into the cavity 12. The end of the male end 21 then engages in the cavity 12, passes through the knurled zone 14 of the socket 1 and moves forward that the lugs 22 open at the groove 13. The half-cylinders carrying the lugs 22 then resume their position, since they form an elastically deformable zone 25, and engage the stop face of the lugs 22 against the radial extension face 16 of the groove. In this position the two knurled areas 14, 24 of the socket 1 and the nozzle 21 are engaged and cooperate to maintain the nozzle 21 in position in the socket 1; the pressure exerted on the surfaces in contact, associated with the interlocking of the two knurls 14, 24, ensures a good holding of the dip tube on the socket 1 and prevents its rotation.
Le tube plongeur est ainsi maintenu tant en rotation, par la coopération des deux moletages 14, 24, qu'en translation, tout d'abord par les deux moletages 14, 24 et ensuite, de façon complémentaire et non impérative, par la coopération des ergots 22 avec la face d'extension radiale 16.  The dip tube is thus maintained both in rotation, by the cooperation of the two knurls 14, 24, and in translation, firstly by the two knurls 14, 24 and then, in a complementary and non-imperative manner, by the cooperation of pins 22 with the radial extension face 16.
Dans la forme de réalisation décrite, l'embout mâle 21 et la cavité 12 ont été représentés comme des cylindres de révolution ; ils peuvent prendre toute autre forme, pour autant que celle-ci permette leur fixation l'un à l'autre. De préférence, ils sont agencés pour s'emboîter l'un dans l'autre, de préférence de telle sorte que cet emboîtement s'effectue par emmanchement, générant ainsi une pression entre les surfaces en contact, de façon à assurer leur solidarisation.  In the embodiment described, the male end 21 and the cavity 12 have been represented as cylinders of revolution; they may take any other form, provided that it allows them to be fixed to each other. Preferably, they are arranged to fit one into the other, preferably such that this interlocking is effected by fitting, thus generating a pressure between the surfaces in contact, so as to ensure their joining.
Enfin les ergots 22, comme les entailles 23, ont été représentés au nombre de deux ; ce nombre n d'ergots 22 peut être différent de 2, le nombre d'entailles 23 étant alors de préférence égal au nombre d'ergots 22 et chacune d'elle étant positionnée entre deux ergots 22. De façon préférentielle les ergots 22 sont répartis régulièrement sur la périphérie de l'embout 21 et les entailles 23 sont décalées de π/η par rapport aux ergots 22. Finally, the lugs 22, like the notches 23, have been represented in number of two; this number n of lugs 22 may be different from 2, the number of notches 23 then preferably being equal to the number of lugs 22 and each of them being positioned between two lugs 22. Preferably the lugs 22 are regularly distributed on the periphery of the nozzle 21 and the notches 23 are offset by π / η relative to the lugs 22.
Bien que l'invention ait été décrite en relation avec un mode de réalisation particulier, il est bien évident qu'elle n'y est nullement limitée et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre de l'invention.  Although the invention has been described in connection with a particular embodiment, it is obvious that it is not limited thereto and that it comprises all the technical equivalents of the means described and their combinations if they are within the scope of the invention.

Claims

REVENDICATIONS
1. Sonde de mesure du niveau d'huile dans un carter de moteur, comportant une prise (1) de fixation de ladite sonde sur une paroi (7) dudit carter et un tube plongeur (2, 3) porté par ladite prise (1), destiné à être au moins en partie immergé dans l'huile et équipé d'un élément de mesure (8) sensible à la hauteur de l'huile dans le carter, caractérisée en ce que ledit tube plongeur (2, 3) est formé en matériau polymère. 1. A sensor for measuring the oil level in a motor housing, comprising a plug (1) for fixing said probe on a wall (7) of said casing and a dip tube (2, 3) carried by said plug (1). ), intended to be at least partly immersed in the oil and equipped with a measuring element (8) sensitive to the height of the oil in the casing, characterized in that said dip tube (2, 3) is formed of polymer material.
2. Sonde de mesure selon la revendication 1 dans laquelle, le tube (2, 3) comportant une portion terminale (3) destinée à être au moins en partie immergée dans l'huile et une portion de raccord (2) entre la portion terminale (3) et la prise (1), la portion de raccord (2) et la portion terminale (3) du tube sont formées en matériau polymère.  2. Measuring probe according to claim 1 wherein the tube (2, 3) having an end portion (3) intended to be at least partly immersed in the oil and a connecting portion (2) between the terminal portion. (3) and the plug (1), the connecting portion (2) and the end portion (3) of the tube are formed of polymer material.
3. Sonde de mesure selon l'une des revendications 1 ou 2 dans laquelle la prise (1) est formée en matériau polymère.  3. Measuring probe according to one of claims 1 or 2 wherein the plug (1) is formed of polymer material.
4. Sonde de mesure selon l'une des revendications 1 à 3, combinée à la revendication 2, dans laquelle la portion terminale (3) comporte deux demi-coquilles emboîtées l'une dans l'autre.  4. Measuring probe according to one of claims 1 to 3, combined with claim 2, wherein the end portion (3) comprises two half-shells nested one inside the other.
5. Sonde de mesure selon la revendication 4, dans laquelle la portion de raccord (2) comporte une portion de tube monobloc.  5. Measuring probe according to claim 4, wherein the connecting portion (2) comprises a monoblock tube portion.
6. Sonde de mesure selon la revendication 5, dans laquelle la portion de raccord (2) supporte, de préférence de manière monobloc, une demi-coquille, une demi-coquille étant apte à être emboîtée sur la demi-coquille supportée par la portion de raccord (2) pour former avec elle la portion terminale (3).  6. Measuring probe according to claim 5, wherein the connecting portion (2) supports, preferably integrally, a half-shell, a half-shell being adapted to be fitted on the half-shell supported by the portion fitting (2) to form with it the end portion (3).
7. Sonde de mesure selon l'une des revendications 1 à 6 dans laquelle le tube plongeur (2, 3) comporte un embout mâle (21) coopérant avec une cavité (12) de la prise (1), le tube plongeur (2, 3) étant relié à la prise (1) par un emmanchage en force dudit embout mâle (21) dans ladite cavité (12).  7. Measuring probe according to one of claims 1 to 6 wherein the dip tube (2, 3) comprises a male end (21) cooperating with a cavity (12) of the socket (1), the dip tube (2). , 3) being connected to the socket (1) by a plugging force of said male end (21) in said cavity (12).
8. Sonde de mesure selon la revendication 7 dans laquelle ladite cavité (12) présente une surface interne avec une zone moletée (14) coopérant avec une zone moletée (24) d'une surface externe dudit embout mâle (21) pour leur emmanchage en force.  8. Measuring probe according to claim 7 wherein said cavity (12) has an inner surface with a knurled area (14) cooperating with a knurled area (24) of an outer surface of said male end (21) for their engagement in strength.
9. Sonde de mesure selon l'une des revendications 7 ou 8 dans laquelle l'embout mâle (21) comporte des moyens (22) d'accrochage, ladite prise (1) comportant des moyens de retenue (16) aptes à coopérer avec lesdits moyens d'accrochage pour le maintien de l'embout mâle (21) dans la prise (1). 9. Measuring probe according to one of claims 7 or 8 wherein the male end (21) comprises means (22) for attachment, said socket (1) having retaining means (16) adapted to cooperate with said hooking means for holding the spigot (21) in the socket (1).
10. Sonde de mesure selon la revendication 9 dans laquelle les moyens d'accrochage comportent des ergots (22) en saillie de l'embout mâle (21) et la prise (1) comporte une gorge (13) de réception desdits ergots (22). 10. Measuring probe according to claim 9 wherein the attachment means comprise lugs (22) projecting from the male end (21) and the socket (1) comprises a groove (13) for receiving said lugs (22). ).
11. Sonde de mesure selon l'une des revendications 7 à 10 dans laquelle l'embout mâle (21) comporte au moins une zone déformable élastiquement (25) permettant de réduire de façon réversible la section de l'embout mâle (21) lors de son introduction dans la cavité (12).  11. Measuring probe according to one of claims 7 to 10 wherein the spigot (21) comprises at least one elastically deformable zone (25) for reversibly reducing the section of the spigot (21) during from its introduction into the cavity (12).
12. Sonde de mesure selon la revendication 11 dans laquelle ladite zone déformable (25) est rendue élastiquement déformable par des entailles (23) pratiquées selon la direction d'introduction de l'embout mâle (21) dans la cavité (12).  12. Measuring probe according to claim 11 wherein said deformable zone (25) is made elastically deformable by notches (23) made in the direction of introduction of the male end (21) in the cavity (12).
13. Sonde de mesure selon les revendications 9 et 12 dans laquelle les entailles (23) sont en nombre égal au nombre n de moyens d'accrochages (22) et décalées de π/η par rapport à eux.  13. Measuring probe according to claims 9 and 12 wherein the notches (23) are in number equal to the number n of hooking means (22) and offset by π / η relative thereto.
14. Moteur de véhicule automobile comprenant un carter équipé d'une sonde de mesure du niveau d'huile selon l'une des revendications 1 à 13.  Motor vehicle engine comprising a housing equipped with an oil level measuring probe according to one of claims 1 to 13.
15. Véhicule automobile équipé d'un moteur selon la revendication précédente.  15. Motor vehicle equipped with a motor according to the preceding claim.
PCT/FR2010/051953 2009-10-01 2010-09-20 Probe for measuring the oil level in a housing of a motor vehicle, consisting of a polymer material WO2011039446A1 (en)

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Application Number Priority Date Filing Date Title
FR0904685 2009-10-01
FR0904685A FR2950968B1 (en) 2009-10-01 2009-10-01 PROBE FOR MEASURING THE OIL LEVEL IN AN AUTOMOBILE HOUSING MADE OF POLYMERIC MATERIAL

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015071598A1 (en) * 2013-11-15 2015-05-21 Valeo Systemes De Controle Moteur Device for measuring a liquid level
FR3015027A1 (en) * 2013-12-12 2015-06-19 Sc2N Sa DEVICE FOR MEASURING LIQUID LEVEL

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102678A2 (en) * 1982-05-17 1984-03-14 Minnesota Mining And Manufacturing Company Liquid level sensing probe
US5057813A (en) * 1989-05-25 1991-10-15 Fuji Jukogyo Kabushiki Kaisha Oil level sensor for an internal combustion engine
FR2707004A1 (en) * 1993-06-24 1994-12-30 Jaeger Device for measuring the level of a liquid, in particlar oil, with a resistive probe
EP1209450A1 (en) * 2000-11-18 2002-05-29 Hella KG Hueck & Co. Device for oil level measurement
DE102007001192A1 (en) * 2007-01-05 2008-07-10 Siemens Ag Apparatus and method for determining a level and a temperature of a fluid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102678A2 (en) * 1982-05-17 1984-03-14 Minnesota Mining And Manufacturing Company Liquid level sensing probe
US5057813A (en) * 1989-05-25 1991-10-15 Fuji Jukogyo Kabushiki Kaisha Oil level sensor for an internal combustion engine
FR2707004A1 (en) * 1993-06-24 1994-12-30 Jaeger Device for measuring the level of a liquid, in particlar oil, with a resistive probe
EP1209450A1 (en) * 2000-11-18 2002-05-29 Hella KG Hueck & Co. Device for oil level measurement
DE102007001192A1 (en) * 2007-01-05 2008-07-10 Siemens Ag Apparatus and method for determining a level and a temperature of a fluid

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015071598A1 (en) * 2013-11-15 2015-05-21 Valeo Systemes De Controle Moteur Device for measuring a liquid level
FR3013447A1 (en) * 2013-11-15 2015-05-22 Valeo Sys Controle Moteur Sas DEVICE FOR MEASURING LIQUID LEVEL
FR3015027A1 (en) * 2013-12-12 2015-06-19 Sc2N Sa DEVICE FOR MEASURING LIQUID LEVEL

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Publication number Publication date
FR2950968B1 (en) 2012-03-23
FR2950968A1 (en) 2011-04-08

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