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EP2350584A1 - Temperature sensor, manufacturing process and corresponding method of assembly - Google Patents

Temperature sensor, manufacturing process and corresponding method of assembly

Info

Publication number
EP2350584A1
EP2350584A1 EP09756156A EP09756156A EP2350584A1 EP 2350584 A1 EP2350584 A1 EP 2350584A1 EP 09756156 A EP09756156 A EP 09756156A EP 09756156 A EP09756156 A EP 09756156A EP 2350584 A1 EP2350584 A1 EP 2350584A1
Authority
EP
European Patent Office
Prior art keywords
temperature
peripheral
temperature sensor
cavity
peripheral portion
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP09756156A
Other languages
German (de)
French (fr)
Inventor
Dominique Le Bouquin
Jean-Pierre Robic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SC2N SAS
Original Assignee
SC2N SAS
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 SAS filed Critical SC2N SAS
Publication of EP2350584A1 publication Critical patent/EP2350584A1/en
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/16—Special arrangements for conducting heat from the object to the sensitive element
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2205/00—Application of thermometers in motors, e.g. of a vehicle
    • G01K2205/04—Application of thermometers in motors, e.g. of a vehicle for measuring exhaust gas temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • the present invention relates to a temperature sensor, particularly adapted for measuring the temperature of motor vehicle gases such as gases in the engine compartment.
  • Such sensors are known for example from documents FR 2 847 979, FR 2 880 685 or FR 2 864234.
  • These sensors comprise a temperature-sensitive element connected to the outside with an electrical / electronic circuit for operating a measurement signal.
  • the temperature-sensitive element is disposed in a peripheral envelope which is inserted into a corresponding cavity of a body (for example the cylinder head of an engine) whose temperature is to be known.
  • the senor is screwed into this corresponding cavity so that the closed end of the peripheral envelope is disposed as close as possible to the temperature zone that is to be measured.
  • the present invention aims to remedy these problems by proposing a temperature sensor, a manufacturing method and an assembly method capable of overcoming the difficulties of the state of the art without increasing costs and manufacturing time.
  • the invention provides a temperature sensor comprising: a temperature-sensitive element and a peripheral envelope receiving the temperature-sensitive element at a closed end, the peripheral envelope being able to be inserted into a corresponding cavity, characterized in that the closed end of the peripheral envelope comprises a peripheral portion releasing at the end of the closed end a flexible assembly abutment consecutively to said peripheral portion, said stop being capable of deforming towards the peripheral portion by cooperation shape with the bottom of the corresponding cavity.
  • the flexible assembly stop has a disc shape
  • the peripheral portion has a frustoconical shape
  • the flexible assembly stop and the peripheral portion of the peripheral envelope are formed in one piece
  • the peripheral envelope is metallic
  • the temperature-sensitive element is a PTC (Positive Temperature Coefficient) type thermistor or a CTN (Negative Temperature Coefficient).
  • the subject of the invention is also a method for manufacturing a temperature sensor as previously described, characterized in that the flexible assembly abutment and the peripheral portion are produced by turning by machining a groove of triangular cross-section in the region. peripheral envelope.
  • the invention further relates to a method of assembling a temperature sensor in a corresponding cavity, the temperature sensor comprising a temperature-sensitive element and a peripheral envelope receiving the temperature-sensitive element at a closed end.
  • the peripheral envelope fitting into said cavity characterized in that it comprises:
  • FIG. 1 represents a view partly in longitudinal section of a temperature sensor according to the invention being assembled in a cavity
  • FIG. 2 represents an enlarged view of a portion of the sensor of FIG. 1,
  • FIG. 3 represents the sensor of FIG. 1 when assembled in the cavity
  • FIG. 4 represents an enlarged view of a portion of the sensor of FIG. 3.
  • the temperature sensor 1 illustrated in FIG. 1 comprises a temperature sensitive element 3, a wiring element 5 connected to the temperature sensitive element 3 and a peripheral envelope 7 enveloping the temperature sensitive element 3 to a closed end 9.
  • the temperature sensitive element 3 is for example a thermistor.
  • the thermistor is a passive component in semiconductor material whose resistance varies according to the temperature and can be of the type "CTN", negative temperature coefficient (or “NTC”, Negative Temperature Coefficient in English) when the temperature decreases in depending on the temperature rise or type "CTP” positive temperature coefficient (or “PTC”, Positive Temperature Coefficient in English) otherwise.
  • the wiring element 5 is connected to the temperature sensitive element 3 to route a temperature signal to a processing unit.
  • the wiring element 5 comprises two electrical conductors in contact with the temperature sensitive element 3 and travels along the peripheral envelope 7 to be accessible outside the it and to provide an electrical information representative of the resistance of the element 3 and therefore the measured temperature.
  • the peripheral casing 7 is of elongate and cylindrical general shape, the longitudinal direction of which corresponds to the direction of the electric wires 5, so that it can be inserted into a corresponding cavity 11.
  • the corresponding cavity 11 is formed in a body 13 whose temperature is to be measured, for example in the motor cylinder head of a motor vehicle.
  • the cavity 11 is of tubular shape and the bottom 15 of the cavity 11, generally of conical shape, is disposed closest to the zone whose temperature is to be measured.
  • peripheral envelope 7 advantageously comprises a threaded portion 17 adapted to be screwed into a corresponding threaded portion 19 of the cavity 11 to fix the sensor 1 to the body 13.
  • the sensor 1 further comprises external fixing means 14 making it possible to grip the sensor 1 to screw it and / or to unscrew it in the body 13.
  • the external fixing means 14 are formed by a bolt.
  • the closed end 9 of the peripheral envelope 7 comprises a thinned peripheral portion 21 that releases at the end of the closed end 9, a flexible assembly stop 23 consecutively to said thinned portion 21, the abutment 23 being capable of deforming towards the thinned peripheral portion 21 by shape cooperation with the bottom 15 of the corresponding cavity 11.
  • the abutment 23 then deforms towards the thinned peripheral portion 21 by shape cooperation with the bottom 15 of the corresponding cavity 11 as can be seen in FIGS. 3 and 4.
  • the end 9 of the deformed peripheral envelope 7 is then in contact with the bottom 15 of the cavity 11, which allows a better heat exchange between the sensor and the body 13, by conduction of the temperature. This gives a temperature measurement with a decreased response time and increased accuracy.
  • the flexible assembly stop 23 has a disc shape.
  • the disc 23 is disposed coaxially with the peripheral envelope 7.
  • the contact surface between the stop 23 and the cavity 11 is larger, making it possible to optimize the heat exchange and thus further reduce the response time of the sensor 1.
  • the deformation of the abutment 23 towards the thinned portion 21 makes it possible to optimize the thermal conduction locally in the zone from which it is desired to measure the temperature and to bring the temperature-sensitive element 3 as close as possible to the bottom 15. the cavity 11 3 which further increases the accuracy of the measurement.
  • the thinned peripheral portion 21 has a frustoconical shape, the top of which adjoins the flexible assembly stop 23.
  • the flexible assembly stop 23 and the thinned peripheral portion 21 of the peripheral envelope 7 are formed. in one piece.
  • the flexible assembly stop 23 is produced by turning by machining a groove of triangular section in the peripheral envelope 7.
  • the disc-shaped abutment 23 is therefore easily realizable and does not require any resumption of machining.
  • the senor 1 In operation and in a first step (FIGS. 1 and 2), the sensor 1 is assembled in the corresponding cavity 11 so as to position a flexible assembly stop 23 of the closed end 9 of the peripheral envelope 7 facing the bottom 15. of the corresponding cavity 11.
  • the assembly of the sensor 1 in the cavity 11 can be achieved by screwing the sensor 1 into the threaded portion of the corresponding cavity 11 until it abuts in the bottom 15 of the corresponding cavity 11. It is expected that the length of the peripheral envelope 7 is substantially equal to the depth of the corresponding cavity 11 but with a clearance J in the assembly of the sensor 1 in the cavity 11, so that during assembly, when the flexible assembly stop 23 is in contact with the bottom 15 of the cavity 11, the sensor 1, which is then not completely screwed into the cavity 11, protrudes slightly from the cavity 11.
  • This clearance J corresponds to the distance that can still go through the sensor 1 from its abutment position 23 undeformed in the assembled state, that is to say with the flexible abutment 23 deformed.
  • a second step (FIGS. 3 and 4), projecting walls of the flexible assembly abutment 23 are deformed at least partially in the direction of the thinned peripheral portion 21 of the closed end 9 of the peripheral envelope 7 by cooperation of formed between the abutment 23 and the bottom 15 of the cavity 11.
  • This operation is performed by applying a greater force by screwing the temperature sensor 1 allowing the deformation of the flexible assembly abutment 23.
  • the protruding portions of the flexible abutment assembly 23 then deform outwardly, taking the shape of the conical bottom 15 of the cavity 11.
  • the assembly is completed when the external fastening means 14 are in contact with the body 13. It is no longer possible to screw the sensor 1, which ensures not to damage the sensor 1 and to deform optimally the flexible assembly stop 23 in the cavity 11.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

The invention relates to a temperature sensor comprising: a temperature-sensitive element (3); and a peripheral casing (7) accommodating the temperature-sensitive element (3) and having a closed end (9), the peripheral casing (7) being able to be inserted into a corresponding cavity (11), characterized in that the closed end (9) of the peripheral casing (7) has a peripheral portion (21) revealing, butted against the closed end, a flexible assembly stop (23) after said peripheral portion (21), said stop (23) being able to deform towards the peripheral portion (21) by shape cooperation with the bottom (15) of the corresponding cavity (11). The subject of the invention is also a process for manufacturing a temperature sensor as described above and a method of assembling said sensor.

Description

Capteur de température, procédé de fabrication et procédé d'assemblage correspondant Temperature sensor, manufacturing method and corresponding assembly method
La présente invention concerne un capteur de température, notamment adapté pour mesurer la température des gaz de véhicules automobiles tels que les gaz dans le compartiment moteur.The present invention relates to a temperature sensor, particularly adapted for measuring the temperature of motor vehicle gases such as gases in the engine compartment.
On connaît de tels capteurs par exemple des documents FR 2 847 979, FR 2 880 685 ou FR 2 864234.Such sensors are known for example from documents FR 2 847 979, FR 2 880 685 or FR 2 864234.
Ces capteurs comprennent un élément sensible à une température, relié vers l'extérieur à un circuit électrique / électronique d'exploitation d'un signal de mesure. L'élément sensible à la température est disposé dans une enveloppe périphérique qui s'insère dans une cavité correspondante d'un corps (par exemple la culasse d'un moteur) dont on cherche à connaître la température.These sensors comprise a temperature-sensitive element connected to the outside with an electrical / electronic circuit for operating a measurement signal. The temperature-sensitive element is disposed in a peripheral envelope which is inserted into a corresponding cavity of a body (for example the cylinder head of an engine) whose temperature is to be known.
De façon connue, le capteur est vissé dans cette cavité correspondante de sorte que l'extrémité fermée de l'enveloppe périphérique soit disposée au plus proche de la zone de température que l'on souhaite mesurer.In a known manner, the sensor is screwed into this corresponding cavity so that the closed end of the peripheral envelope is disposed as close as possible to the temperature zone that is to be measured.
Il peut toutefois subsister un jeu entre l'extrémité fermée de l'enveloppe périphérique et le fond de la cavité du fait des tolérances dimensionnelles de l'enveloppe périphérique et de la cavité. Ce jeu est nécessaire pour le montage du capteur dans la cavité mais peut cependant contribuer à diminuer sensiblement le temps de réponse du capteur ainsi que de sa précision.However, there may be a gap between the closed end of the peripheral envelope and the bottom of the cavity due to the dimensional tolerances of the peripheral envelope and the cavity. This clearance is necessary for mounting the sensor in the cavity but can however contribute to significantly reduce the response time of the sensor as well as its accuracy.
La présente invention vise à remédier à ces problèmes en proposant un capteur de température, un procédé de fabrication et un procédé d'assemblage aptes à surmonter les difficultés de l'état de la technique sans augmenter les coûts et les temps de fabrication.The present invention aims to remedy these problems by proposing a temperature sensor, a manufacturing method and an assembly method capable of overcoming the difficulties of the state of the art without increasing costs and manufacturing time.
A cet effet, l'invention prévoit un capteur de température comprenant : un élément sensible à la température et, une enveloppe périphérique recevant l'élément sensible à la température à une extrémité fermée, l'enveloppe périphérique étant apte à s'insérer dans une cavité correspondante, caractérisé en ce que l'extrémité fermée de l'enveloppe périphérique comporte une portion périphérique dégageant en bout de l'extrémité fermée une butée flexible d'assemblage consécutivement à ladite portion périphérique, ladite butée étant susceptible de se déformer vers la portion périphérique par coopération de forme avec le fond de la cavité correspondante.For this purpose, the invention provides a temperature sensor comprising: a temperature-sensitive element and a peripheral envelope receiving the temperature-sensitive element at a closed end, the peripheral envelope being able to be inserted into a corresponding cavity, characterized in that the closed end of the peripheral envelope comprises a peripheral portion releasing at the end of the closed end a flexible assembly abutment consecutively to said peripheral portion, said stop being capable of deforming towards the peripheral portion by cooperation shape with the bottom of the corresponding cavity.
Selon d'autres caractéristiques du capteur de température,According to other characteristics of the temperature sensor,
- la butée flexible d'assemblage présente une forme de disque,the flexible assembly stop has a disc shape,
- la portion périphérique présente une forme tronconique,the peripheral portion has a frustoconical shape,
- la butée flexible d'assemblage et la portion périphérique de l'enveloppe périphérique sont formées d'une seule pièce,the flexible assembly stop and the peripheral portion of the peripheral envelope are formed in one piece,
- l'enveloppe périphérique est métallique,the peripheral envelope is metallic,
- l'élément sensible à la température est une thermistance de type CTP (Coefficient de Température Positif) ou une CTN (Coefficient de Température Négatif). L'invention a aussi pour objet un procédé de fabrication d'un capteur de température tel que précédemment décrit, caractérisé en ce qu'on réalise la butée flexible d'assemblage et la portion périphérique par tournage en usinant une gorge de section triangulaire dans l'enveloppe périphérique.the temperature-sensitive element is a PTC (Positive Temperature Coefficient) type thermistor or a CTN (Negative Temperature Coefficient). The subject of the invention is also a method for manufacturing a temperature sensor as previously described, characterized in that the flexible assembly abutment and the peripheral portion are produced by turning by machining a groove of triangular cross-section in the region. peripheral envelope.
L'invention a encore pour objet un procédé d'assemblage d'un capteur de température dans une cavité correspondante, le capteur de température comprenant un élément sensible à la température et une enveloppe périphérique recevant l'élément sensible à la température à une extrémité fermée, l'enveloppe périphérique s'insérant dans ladite cavité, caractérisé en ce qu'il comporte :The invention further relates to a method of assembling a temperature sensor in a corresponding cavity, the temperature sensor comprising a temperature-sensitive element and a peripheral envelope receiving the temperature-sensitive element at a closed end. , the peripheral envelope fitting into said cavity, characterized in that it comprises:
- une première étape d'assemblage dudit capteur dans la cavité correspondante de façon à positionner une butée flexible d'assemblage de l'extrémité fermée de l'enveloppe périphérique face à un fond de la cavité correspondante,a first step of assembling said sensor in the corresponding cavity so as to position a flexible assembly stop of the closed end of the peripheral envelope facing a bottom of the corresponding cavity,
- une seconde étape au cours de laquelle on déforme au moins partiellement des parois saillantes de la butée flexible d'assemblage en direction d'une portion périphérique de ladite extrémité de l'enveloppe périphérique par coopération de forme entre ladite butée et le fond de ladite cavité, de façon à sertir l'assemblage dudit capteur dans ladite cavité.a second step during which at least partially projecting walls of the flexible assembly abutment are deformed in the direction of a peripheral portion of said end of the peripheral envelope by co-operating of shape between said stop and the bottom of said cavity, so as to crimp the assembly of said sensor in said cavity.
D'autres avantages et caractéristiques apparaîtront à la lecture de la description de l'invention, ainsi que des figures suivantes sur lesquelles :Other advantages and characteristics will appear on reading the description of the invention, as well as the following figures in which:
- la figure 1 représente une vue en partie en coupe longitudinale d'un capteur de température selon l'invention en cours d'assemblage dans une cavité,FIG. 1 represents a view partly in longitudinal section of a temperature sensor according to the invention being assembled in a cavity,
- la figure 2 représente une vue agrandie d'une partie du capteur de la figure 1,FIG. 2 represents an enlarged view of a portion of the sensor of FIG. 1,
- la figure 3 représente le capteur de la figure 1 à l'état assemblé dans la cavité et, - la figure 4 représente une vue agrandie d'une partie du capteur de la figure 3.FIG. 3 represents the sensor of FIG. 1 when assembled in the cavity, and FIG. 4 represents an enlarged view of a portion of the sensor of FIG. 3.
Sur toutes les figures, les éléments identiques portent les mêmes numéros de référence.In all the figures, the identical elements bear the same reference numbers.
Le capteur de température 1 illustré sur la figure 1, comprend un élément sensible à la température 3, un élément de câblage 5 connecté à l'élément sensible à la température 3 et une enveloppe périphérique 7 enveloppant l'élément sensible à la température 3 à une extrémité fermée 9.The temperature sensor 1 illustrated in FIG. 1 comprises a temperature sensitive element 3, a wiring element 5 connected to the temperature sensitive element 3 and a peripheral envelope 7 enveloping the temperature sensitive element 3 to a closed end 9.
L'élément sensible à la température 3 est par exemple une thermistance. La thermistance est un composant passif en matériau semi-conducteur dont la résistance varie en fonction de la température et peut être du type « CTN », coefficient de température négatif (ou « NTC », Négative Température Coefficient en anglais) lorsque la température décroît en fonction de l'élévation de la température ou de type « CTP » coefficient de température positif (ou « PTC », Positive Température Coefficient en anglais) dans le cas contraire. L'élément de câblage 5 est connecté à l'élément sensible à la température 3 pour acheminer un signal de température à une unité de traitement.The temperature sensitive element 3 is for example a thermistor. The thermistor is a passive component in semiconductor material whose resistance varies according to the temperature and can be of the type "CTN", negative temperature coefficient (or "NTC", Negative Temperature Coefficient in English) when the temperature decreases in depending on the temperature rise or type "CTP" positive temperature coefficient (or "PTC", Positive Temperature Coefficient in English) otherwise. The wiring element 5 is connected to the temperature sensitive element 3 to route a temperature signal to a processing unit.
Par exemple, et comme illustré sur la figure 1, l'élément de câblage 5 comporte deux conducteurs électriques en contact avec l'élément sensible à la température 3 et cheminent le long de l'enveloppe périphérique 7 pour être accessibles à l'extérieur de celle-ci et pour fournir une information électrique représentative de la résistance de l'élément 3 et par conséquent de la température mesurée.For example, and as illustrated in FIG. 1, the wiring element 5 comprises two electrical conductors in contact with the temperature sensitive element 3 and travels along the peripheral envelope 7 to be accessible outside the it and to provide an electrical information representative of the resistance of the element 3 and therefore the measured temperature.
L'enveloppe périphérique 7 est de forme générale allongée et cylindrique, dont la direction longitudinale correspond à la direction des fils électriques 5, de manière à pouvoir être insérée dans une cavité correspondante 11.The peripheral casing 7 is of elongate and cylindrical general shape, the longitudinal direction of which corresponds to the direction of the electric wires 5, so that it can be inserted into a corresponding cavity 11.
La cavité correspondante 11 est ménagée dans un corps 13 dont on souhaite mesurer la température, par exemple dans la culasse moteur d'un véhicule automobile.The corresponding cavity 11 is formed in a body 13 whose temperature is to be measured, for example in the motor cylinder head of a motor vehicle.
La cavité 11 est de forme tubulaire et le fond 15 de la cavité 11, généralement de forme conique, est disposé au plus proche de la zone dont on souhaite mesurer la température.The cavity 11 is of tubular shape and the bottom 15 of the cavity 11, generally of conical shape, is disposed closest to the zone whose temperature is to be measured.
En outre, l'enveloppe périphérique 7 comporte avantageusement une partie filetée 17 apte à être vissée dans une partie taraudée 19 correspondante de la cavité 11 pour fixer le capteur 1 au corps 13.In addition, the peripheral envelope 7 advantageously comprises a threaded portion 17 adapted to be screwed into a corresponding threaded portion 19 of the cavity 11 to fix the sensor 1 to the body 13.
Le capteur 1 comporte en outre des moyens de fixation extérieurs 14 permettant de saisir le capteur 1 pour le visser et/ou dévisser dans le corps 13.The sensor 1 further comprises external fixing means 14 making it possible to grip the sensor 1 to screw it and / or to unscrew it in the body 13.
Dans l'exemple schématisé sur les figures, les moyens de fixation extérieurs 14 sont formés par un boulon.In the example shown schematically in the figures, the external fixing means 14 are formed by a bolt.
Selon l'invention, et comme mieux visible sur la figure 2, l'extrémité fermée 9 de l'enveloppe périphérique 7 comporte une portion périphérique amincie 21 dégageant en bout de l'extrémité fermée 9, une butée flexible d'assemblage 23 consécutivement à ladite portion amincie 21, la butée 23 étant susceptible de se déformer vers la portion périphérique amincie 21 par coopération de forme avec le fond 15 de la cavité correspondante 11.According to the invention, and as best seen in FIG. 2, the closed end 9 of the peripheral envelope 7 comprises a thinned peripheral portion 21 that releases at the end of the closed end 9, a flexible assembly stop 23 consecutively to said thinned portion 21, the abutment 23 being capable of deforming towards the thinned peripheral portion 21 by shape cooperation with the bottom 15 of the corresponding cavity 11.
Ainsi, après assemblage du capteur 1 dans la cavité 11, la butée 23 se déforme alors vers la portion périphérique amincie 21 par coopération de forme avec le fond 15 de la cavité correspondante 11 comme on peut le voir sur les figures 3 et 4.Thus, after assembly of the sensor 1 in the cavity 11, the abutment 23 then deforms towards the thinned peripheral portion 21 by shape cooperation with the bottom 15 of the corresponding cavity 11 as can be seen in FIGS. 3 and 4.
L'extrémité 9 de l'enveloppe périphérique 7 déformée est alors en contact avec le fond 15 de la cavité 11, ce qui permet un meilleur échange thermique entre le capteur et le corps 13, par conduction de la température. On obtient ainsi une mesure de température avec un temps de réponse diminué et une précision augmentée.The end 9 of the deformed peripheral envelope 7 is then in contact with the bottom 15 of the cavity 11, which allows a better heat exchange between the sensor and the body 13, by conduction of the temperature. This gives a temperature measurement with a decreased response time and increased accuracy.
Selon un mode de réalisation préféré, la butée flexible d'assemblage 23 présente une forme de disque. Le disque 23 est disposé coaxialement à l'enveloppe périphérique 7.According to a preferred embodiment, the flexible assembly stop 23 has a disc shape. The disc 23 is disposed coaxially with the peripheral envelope 7.
Ainsi, une fois les parties saillantes du disque 23 déformées, la surface de contact entre la butée 23 et la cavité 11 est plus importante, permettant d'optimiser l'échange thermique et donc de diminuer encore le temps de réponse du capteur 1.Thus, once the projecting portions of the disk 23 are deformed, the contact surface between the stop 23 and the cavity 11 is larger, making it possible to optimize the heat exchange and thus further reduce the response time of the sensor 1.
En outre, la déformation de la butée 23 vers la portion amincie 21, permet d'optimiser la conduction thermique localement dans la zone dont on souhaite mesurer la température et de rapprocher l'élément sensible à la température 3 le plus possible du fond 15 de la cavité 113 ce qui permet encore d'augmenter la précision de la mesure.In addition, the deformation of the abutment 23 towards the thinned portion 21 makes it possible to optimize the thermal conduction locally in the zone from which it is desired to measure the temperature and to bring the temperature-sensitive element 3 as close as possible to the bottom 15. the cavity 11 3 which further increases the accuracy of the measurement.
On prévoit en outre que la portion périphérique amincie 21 présente une forme tronconique dont le somment jouxte la butée flexible d'assemblage 23. De préférence, la butée flexible d'assemblage 23 et la portion périphérique amincie 21 de l'enveloppe périphérique 7 sont formées d'une seule pièce.It is further provided that the thinned peripheral portion 21 has a frustoconical shape, the top of which adjoins the flexible assembly stop 23. Preferably, the flexible assembly stop 23 and the thinned peripheral portion 21 of the peripheral envelope 7 are formed. in one piece.
Ainsi, aucun composant n'est ajouté au capteur 1, ce qui permet d'obtenir un capteur 1 robuste.Thus, no component is added to the sensor 1, which makes it possible to obtain a robust sensor 1.
Selon un mode de fabrication du capteur 1, on réalise la butée flexible d'assemblage 23 par tournage en usinant une gorge de section triangulaire dans l'enveloppe périphérique 7.According to a method of manufacturing the sensor 1, the flexible assembly stop 23 is produced by turning by machining a groove of triangular section in the peripheral envelope 7.
La butée 23 en forme de disque est donc facilement réalisable et ne nécessite aucune reprise d'usinage.The disc-shaped abutment 23 is therefore easily realizable and does not require any resumption of machining.
En fonctionnement et dans une première étape (figures 1 et 2) on assemble le capteur 1 dans la cavité correspondante 11 de façon à positionner une butée flexible d'assemblage 23 de l'extrémité fermée 9 de l'enveloppe périphérique 7 face au fond 15 de la cavité correspondante 11.In operation and in a first step (FIGS. 1 and 2), the sensor 1 is assembled in the corresponding cavity 11 so as to position a flexible assembly stop 23 of the closed end 9 of the peripheral envelope 7 facing the bottom 15. of the corresponding cavity 11.
L'assemblage du capteur 1 dans la cavité 11 peut être réalisé en vissant le capteur 1 dans la partie taraudée de la cavité 11 correspondante jusqu'à venir en butée dans le fond 15 de la cavité correspondante 11. On prévoit que la longueur de l'enveloppe périphérique 7 soit sensiblement égale à la profondeur de la cavité correspondante 11 mais avec un jeu J dans l'assemblage du capteur 1 dans la cavité 11, de sorte qu'en cours d'assemblage, lorsque la butée flexible d'assemblage 23 est en contact avec le fond 15 de la cavité 11, le capteur 1, qui n'est alors pas totalement vissé dans la cavité 11, dépasse légèrement de la cavité 11.The assembly of the sensor 1 in the cavity 11 can be achieved by screwing the sensor 1 into the threaded portion of the corresponding cavity 11 until it abuts in the bottom 15 of the corresponding cavity 11. It is expected that the length of the peripheral envelope 7 is substantially equal to the depth of the corresponding cavity 11 but with a clearance J in the assembly of the sensor 1 in the cavity 11, so that during assembly, when the flexible assembly stop 23 is in contact with the bottom 15 of the cavity 11, the sensor 1, which is then not completely screwed into the cavity 11, protrudes slightly from the cavity 11.
Ce jeu J correspond à la distance que peut encore parcourir le capteur 1 de sa position en butée 23 non déformée à l'état assemblé, c'est-à-dire avec la butée flexible 23 déformée.This clearance J corresponds to the distance that can still go through the sensor 1 from its abutment position 23 undeformed in the assembled state, that is to say with the flexible abutment 23 deformed.
Dans une deuxième étape, (figures 3 et 4) on déforme au moins partiellement des parois saillantes de la butée flexible d'assemblage 23 en direction de la portion périphérique amincie 21 de l'extrémité fermée 9 de l'enveloppe périphérique 7 par coopération de forme entre la butée 23 et le fond 15 de la cavité 11. Cette opération est réalisée en appliquant une force plus importante en vissant le capteur de température 1 permettant la déformation de la butée flexible d'assemblage 23. Les portions saillantes de la butée flexible d'assemblage 23 se déforment alors vers l'extérieur, en épousant la forme du fond conique 15 de la cavité 11.In a second step, (FIGS. 3 and 4), projecting walls of the flexible assembly abutment 23 are deformed at least partially in the direction of the thinned peripheral portion 21 of the closed end 9 of the peripheral envelope 7 by cooperation of formed between the abutment 23 and the bottom 15 of the cavity 11. This operation is performed by applying a greater force by screwing the temperature sensor 1 allowing the deformation of the flexible assembly abutment 23. The protruding portions of the flexible abutment assembly 23 then deform outwardly, taking the shape of the conical bottom 15 of the cavity 11.
L'assemblage est terminé lorsque les moyens de fixation extérieurs 14 sont en contact avec le corps 13. Il n'est alors plus possible de visser le capteur 1, ce qui assure de ne pas endommager le capteur 1 et de déformer de façon optimale la butée flexible d'assemblage 23 dans la cavité 11.The assembly is completed when the external fastening means 14 are in contact with the body 13. It is no longer possible to screw the sensor 1, which ensures not to damage the sensor 1 and to deform optimally the flexible assembly stop 23 in the cavity 11.
On obtient ainsi un capteur de température 1 facile à réaliser et à assembler, dont le temps de réponse est diminué et la précision augmentée. This gives a temperature sensor 1 easy to make and assemble, whose response time is decreased and the accuracy increased.

Claims

REVENDICATIONS
1. Capteur de température comprenant : un élément sensible à la température (3) et, une enveloppe périphérique (7) recevant l'élément sensible à la température (3) à une extrémité fermée (9), l'enveloppe périphérique (7) étant apte à s'insérer dans une cavité correspondante (11), caractérisé en ce que l'extrémité fermée (9) de l'enveloppe périphérique (7) comporte une portion périphérique (21) dégageant en bout de l'extrémité fermée une butée flexible d'assemblage (23) consécutivement à ladite portion périphérique (21), ladite butée (23) étant susceptible de se déformer vers la portion périphérique (21) par coopération de forme avec le fond (15) de la cavité correspondante (11).A temperature sensor comprising: a temperature sensitive element (3) and a peripheral envelope (7) receiving the temperature sensitive element (3) at a closed end (9), the peripheral envelope (7) being able to fit into a corresponding cavity (11), characterized in that the closed end (9) of the peripheral envelope (7) comprises a peripheral portion (21) releasing at the end of the closed end a stop flexible assembly (23) consecutively to said peripheral portion (21), said stop (23) being capable of deforming towards the peripheral portion (21) by shape cooperation with the bottom (15) of the corresponding cavity (11) .
2. Capteur de température selon la revendication 1, caractérisé en ce que la butée flexible d'assemblage (23) présente une forme de disque.2. Temperature sensor according to claim 1, characterized in that the flexible assembly stop (23) has a disc shape.
3. Capteur de température selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que la portion périphérique (21) présente une forme tronconique.3. Temperature sensor according to any one of claims 1 or 2, characterized in that the peripheral portion (21) has a frustoconical shape.
4. Capteur de température selon l'une quelconque des revendications précédentes, caractérisé en ce que la butée flexible d'assemblage (23) et la portion périphérique4. Temperature sensor according to any one of the preceding claims, characterized in that the flexible assembly stop (23) and the peripheral portion
(21) de l'enveloppe périphérique (7) sont formées d'une seule pièce.(21) of the peripheral shell (7) are formed in one piece.
5. Capteur de température selon l'une quelconque des revendications précédentes, caractérisé en ce que l'enveloppe périphérique (7) est métallique.5. Temperature sensor according to any one of the preceding claims, characterized in that the peripheral envelope (7) is metallic.
6. Capteur de température selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément sensible à la température (3) est une thermistance de type CTP (Coefficient de Température Positif) ou une CTN (Coefficient de Température Négatif). 6. Temperature sensor according to any one of the preceding claims, characterized in that the temperature-sensitive element (3) is a PTC type thermistor (Positive Temperature Coefficient) or a CTN (Negative Temperature Coefficient).
7. Procédé de fabrication d'un capteur de température selon l'une quelconque des revendications 2 à 6, caractérisé en ce qu'on réalise la butée flexible d'assemblage (23) et la portion périphérique (21) par tournage en usinant une gorge de section triangulaire dans l'enveloppe périphérique (7).7. A method of manufacturing a temperature sensor according to any one of claims 2 to 6, characterized in that realizes the flexible assembly stop (23) and the peripheral portion (21) by turning by machining a triangular section groove in the peripheral envelope (7).
8. Procédé d'assemblage d'un capteur de température (1) dans une cavité correspondante (11), le capteur de température (1) comprenant un élément sensible à la température (3) et une enveloppe périphérique (7) recevant l'élément sensible à la température (3) à une extrémité fermée (9), l'enveloppe périphérique (7) s 'insérant dans ladite cavité (11), caractérisé en ce qu'il comporte :8. A method of assembling a temperature sensor (1) in a corresponding cavity (11), the temperature sensor (1) comprising a temperature-sensitive element (3) and a peripheral envelope (7) receiving the temperature sensor (1). temperature-sensitive element (3) at a closed end (9), the peripheral envelope (7) inserting into said cavity (11), characterized in that it comprises:
- une première étape d'assemblage dudit capteur (1) dans la cavité correspondante (11) de façon à positionner une butée flexible d'assemblage (23) de l'extrémité fermée (9) de l'enveloppe périphérique (7) face à un fond (15) de la cavité correspondante (11), - une seconde étape au cours de laquelle on déforme au moins partiellement des parois saillantes de la butée flexible d'assemblage (23) en direction d'une portion périphérique (21) de ladite extrémité (9) de l'enveloppe périphérique (7) par coopération de forme entre ladite butée (23) et le fond (15) de ladite cavité (11). a first step of assembling said sensor (1) in the corresponding cavity (11) so as to position a flexible assembly stop (23) of the closed end (9) of the peripheral envelope (7) facing a bottom (15) of the corresponding cavity (11), - a second step during which at least partially projecting walls of the flexible assembly abutment (23) are deformed in the direction of a peripheral portion (21) of said end (9) of the peripheral envelope (7) by shape cooperation between said stop (23) and the bottom (15) of said cavity (11).
EP09756156A 2008-10-27 2009-10-23 Temperature sensor, manufacturing process and corresponding method of assembly Ceased EP2350584A1 (en)

Applications Claiming Priority (2)

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FR0805958A FR2937724A1 (en) 2008-10-27 2008-10-27 TEMPERATURE SENSOR, METHOD OF MANUFACTURE AND METHOD FOR ASSEMBLING SAME
PCT/FR2009/001240 WO2010049605A1 (en) 2008-10-27 2009-10-23 Temperature sensor, manufacturing process and corresponding method of assembly

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BR (1) BRPI0920058A2 (en)
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MX2011004361A (en) 2011-08-12
US9039277B2 (en) 2015-05-26
CN102265128A (en) 2011-11-30
JP5756015B2 (en) 2015-07-29
US20110286494A1 (en) 2011-11-24
KR101658073B1 (en) 2016-09-21
JP2012507001A (en) 2012-03-22
FR2937724A1 (en) 2010-04-30
WO2010049605A1 (en) 2010-05-06
RU2500994C2 (en) 2013-12-10
RU2011121342A (en) 2012-12-10
BRPI0920058A2 (en) 2016-02-16
KR20110071023A (en) 2011-06-27

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