EP2805321B1 - Capteur à ultrasons - Google Patents

Capteur à ultrasons Download PDF

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Publication number
EP2805321B1
EP2805321B1 EP12797803.9A EP12797803A EP2805321B1 EP 2805321 B1 EP2805321 B1 EP 2805321B1 EP 12797803 A EP12797803 A EP 12797803A EP 2805321 B1 EP2805321 B1 EP 2805321B1
Authority
EP
European Patent Office
Prior art keywords
decoupling ring
lip
housing
ultrasound sensor
sensor according
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.)
Active
Application number
EP12797803.9A
Other languages
German (de)
English (en)
Other versions
EP2805321A1 (fr
Inventor
David Bartylla
Bayar Bayarsaikhan
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2805321A1 publication Critical patent/EP2805321A1/fr
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Publication of EP2805321B1 publication Critical patent/EP2805321B1/fr
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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • G10K9/22—Mountings; Casings

Definitions

  • the invention is based on an ultrasonic sensor according to the preamble of claim 1. Furthermore, the invention also relates to a use of an ultrasonic sensor.
  • a field of application for ultrasonic sensors are, for example, driver assistance systems in motor vehicles.
  • the distance to the motor vehicle surrounding objects is determined with the ultrasonic sensors.
  • a sound pulse is transmitted by the ultrasonic sensor, which is reflected by an object in the vicinity of the motor vehicle.
  • the reflected echo is received and from the duration of the sound, the distance to the object is determined.
  • Ultrasonic sensors as used for example for measuring distances to objects in motor vehicles, usually have a membrane, for example in the form of a diaphragm pot, which can be set in vibration with a sound transducer.
  • a transducer usually a piezo element is used.
  • the diaphragm pot is connected to a housing with which the ultrasound sensor thus mounted is mounted, for example, in a bumper of a motor vehicle.
  • Such ultrasonic sensors can be used as transmitters, as receivers or as combined transmitters and receivers. If the ultrasonic sensor is used as transmitter and receiver, then a short sound pulse is sent, waiting for the decay of the membrane and then receive the signal. Upon receiving, the membrane is vibrated again by the impinging sound waves, creating a voltage in the transducer that can be detected.
  • the diaphragm pot is usually filled with a dampening filling material.
  • the filling material is usually a foam which foams only after introduction into the membrane pot. Due to differences in manufacturing accuracy and dosing differences during foaming, the filling material may escape via the height of the diaphragm pot and may also contact the housing. As a result, there is the possibility that structure-borne noise is transmitted from the membrane to the housing through the filling material. However, this vibration transmission through the filler material to the housing is not desirable.
  • an ultrasonic sensor for transmitting and / or receiving ultrasonic signals comprising a diaphragm pot with a transducer and a housing, wherein the diaphragm pot is detachably connected to the housing and between diaphragm pot and housing
  • Decoupling ring is added and the diaphragm pot is filled with a filling material.
  • the decoupling ring has a lip which is designed such that a gap is formed between the lip and the housing inner wall and the filling material is accommodated in a space enclosed by the diaphragm pot and lip on the decoupling ring.
  • Another advantage of the solution according to the invention is that only the geometry of the decoupling ring is changed and thereby current manufacturing processes for the ultrasonic sensor can be maintained.
  • the decoupling ring is made of a damping material.
  • a material for the preparation of the decoupling ring for example, a rubber-elastic material is suitable. Suitable rubber-elastic materials are, for example, natural or synthetic rubber or a thermoplastic elastomer.
  • the rubber-elastic material from which the decoupling ring is made selected from natural rubber, styrene-butadiene copolymers (SBR), polybutadiene, polyisoprene, polychloroprene, nitrile rubber, silicone rubber, polyisobutylene, butyl rubber, ethylene-vinyl acetate rubber, ethylene-propylene Copolymers (EPM / EPDM), silicones, silicone gels and silicone foams, for example Fermasil®.
  • SBR styrene-butadiene copolymers
  • polybutadiene polyisoprene
  • polychloroprene nitrile rubber
  • silicone rubber polyisobutylene
  • butyl rubber ethylene-vinyl acetate rubber
  • EPM / EPDM ethylene-propylene Copolymers
  • silicones silicone gels and silicone foams
  • Fermasil® ethylene-propylene copolymers
  • the decoupling ring usually has the same shape as the circumference of the diaphragm pot.
  • the decoupling ring is therefore rotationally symmetric, that is designed circular.
  • any other design for example, as a polygon, for example, with three, four or six corners or the design in the form of an ellipse is conceivable. Any other form for the decoupling ring is possible.
  • the decoupling ring is rotationally symmetrical circular. Since the decoupling ring completely surrounds the diaphragm pot, the lip extends in the axial direction to the symmetry axis of the decoupling ring.
  • the lip for example, has an angle to the axis of symmetry.
  • the space laterally delimited by the lip can, for example, be rejuvenated or widened. It is only essential that the lip does not touch the housing. It is preferred if the lip is aligned in the same direction as the side walls of the diaphragm pot.
  • the decoupling ring has a contact region in which the decoupling ring rests with one side on the diaphragm pot and with an opposite side on the housing, wherein the decoupling ring has at least one rib in the contact region.
  • the rib is preferably designed circumferentially.
  • the height of the lip is preferably chosen so that the filling material, with which the diaphragm cup is filled, does not penetrate via the lip into the gap between the decoupling ring and the housing inner wall.
  • the height of the lip is to be selected such that, even with different dimensions of the space formed by the diaphragm pot and the lip due to manufacturing tolerances and due to manufacturing tolerances different amount of filler each ensures that no filler over the lip in the gap between Decoupling ring and housing inner wall penetrates.
  • the height of the lip is therefore preferably chosen so that with minimal height of the space formed by diaphragm pot and lip and maximum filling nor the entire filler after foaming remains in the space formed by diaphragm cup and lip and not on the lip in the gap between the lip and Housing inner wall penetrates.
  • the sound transducer which is used to generate a sound signal or, in the receiving mode of the ultrasonic sensor, a sound signal impinging on the sensor is preferably a piezo transducer.
  • a piezo transducer In addition to a piezo transducer but any other known to the expert sound transducer is used. However, the use of a piezoelectric transducer is preferred since it allows the transmission of defined pulses.
  • the filling material used for damping in the ultrasonic sensor is preferably a closed-cell polymer foam.
  • Any suitable polymer foam known to the person skilled in the art is suitable here. It is particularly preferred if the polymer foam is a silicone-based foam.
  • Such a closed-cell polymer foam based on silicone is available, for example, under the trade name Fermasil® from Sonderhoff Chemicals GmbH.
  • closed-cell polyurethane-based foams are also suitable, for example.
  • the ultrasound sensor designed according to the invention is suitable, for example, as a distance sensor in a driver assistance system, the ultrasound sensor in this case being mounted on the vehicle and being used to measure the distance to objects around the vehicle.
  • the ultrasonic sensor according to the invention can also be used, for example, in driverless transport systems.
  • the ultrasonic sensor according to the invention is particularly preferably used as a distance sensor for driver assistance systems in motor vehicles or in driverless transport systems.
  • the single FIGURE shows a sectional view of an inventively designed ultrasonic sensor.
  • An ultrasonic sensor 1 comprises a diaphragm pot 3, which is fastened to a housing 7 with a union nut 5.
  • a sound transducer 11 is mounted on the inner side. With the sound transducer 11 ultrasonic pulses are generated, which set the bottom 9 of the diaphragm pot 3 in vibration. The vibrations are output to the outside, whereby a sound pulse is sent from the ultrasonic sensor 1. The transmitted sound pulse is reflected in the presence of an object of this object and the echo is received from the bottom 9 of the diaphragm pot 3. As a result, the bottom 9 of the diaphragm pot 3 is set in vibrations which are transmitted to the sound transducer 11. The vibrations are detected by the transducer 11 and converted into a signal. In this way, the distance to the object can be determined by the sound transit time from the transmission of the signal to the reception of the reflected echo. As a transducer 11, a piezoelectric element is usually used.
  • the diaphragm pot 3 is preferably filled with a dampening filling material 15.
  • the filling material 15 is preferably a closed-cell polymer foam, preferably a closed-cell polymer foam based on silicone.
  • a decoupling ring 13 is accommodated between the diaphragm pot 3 and the housing 7.
  • the union nut 5 is also on the decoupling ring 13 and not directly on the diaphragm pot 3.
  • the diaphragm pot has a collar 17, which is enclosed by the decoupling ring 13.
  • the decoupling ring 13 is applied to the collar 17.
  • the union nut 5 With the union nut 5, the decoupling ring 13 is pressed against the collar 17 and so the diaphragm pot 3 is connected to the housing 7.
  • the decoupling ring 13 is made of a damping material. Suitable damping materials are in particular, as already described above, elastomers.
  • the decoupling ring is preferably formed with a low rigidity.
  • the decoupling ring 13 has a contact region 19. In the contact region 19 of the decoupling ring 13 is located with a first side 21 on the diaphragm pot 3. With one of the first side 21 opposite side 23 of the decoupling ring 13 is located on the housing 7.
  • a reduction of the rigidity is achieved by the contact region 19 having at least one rib 25.
  • the ribs are the areas that rest on the diaphragm pot 3 or on the housing 7.
  • the ribs 25 are preferably designed circumferentially in the contact region of the decoupling ring 13.
  • the ribs may alternatively also run in a zigzag or wavy manner. The number of ribs results from the desired reduction of the wall thickness of the decoupling ring and the width of the collar 17 on the diaphragm pot 3.
  • the decoupling ring 13 furthermore has a lip 27.
  • the lip 27 is preferably formed circumferentially on the decoupling ring 13.
  • the lip is aligned in the axial direction parallel to a symmetry axis 29.
  • the lip is designed so that a gap 31 between the lip 27 and the housing 7 is formed.
  • the lip 27 has an inclination to the axis of symmetry 29, wherein the lip can be both inclined so that one of the diaphragm pot 3 and the lip 27 enclosed space 33 widened in the region of the lip 27 or, alternatively, tapers in the area of the lip 27 as well.
  • the lip points with increasing distance from the diaphragm pot 3 outwardly away from the axis of symmetry 29 and at a taper of the diameter of the space, the lip 27 with increasing distance from the diaphragm pot 3 in the direction of the axis of symmetry 29th
  • the sound transducer 11 is usually inserted only after the assembly of diaphragm pot 9 and housing 7 and is generally connected by gluing to the diaphragm pot 9, it is necessary that the diameter of the space 33 be kept so large that a mounting of the transducer after mounting the other components of the ultrasonic sensor 1 is still possible.
  • the space 33 is filled with the filler 15.
  • the filling material 15 is preferably introduced in the form of a liquid in the space 33, wherein the liquid cures after introduction into the space 33 and thereby foams.
  • the filler material is usually a material that forms a closed-cell foam after foaming, preferably based on silicone.
  • the filling material 15 serves for damping, so that a fast decay is achieved after sending a sound pulse.
  • the lip 27 is formed on the decoupling ring 13. This prevents the filling material 15 from coming into contact with the housing 7.
  • the height of the lip 27 is selected so that the filling material 15 does not flow via the lip 27 into the gap 31 after foaming.
  • the height of the lip 27 is chosen so that at minimum height of the side wall 35 of the diaphragm pot 13 and maximum amount of filler material after foaming no filler 15 via the lip 27 in the Gap 31 arrives. In this way, on the one hand, optimum damping of the sound transducer 11 is achieved after the termination of a signal, and on the other hand, structure-borne noise is transmitted via the filling material 15 from the sound transducer 11 to the housing 7.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Claims (11)

  1. Capteur à ultrasons destiné à envoyer et/ou recevoir des signaux d'ultrasons,
    comprenant une cuvette (3) à membrane dotée d'un convertisseur acoustique (11) et d'un boîtier (7),
    la cuvette (3) à membrane étant raccordée de manière libérable au boîtier (7) et une bague de découplage (13) étant prévue entre la cuvette (3) à membrane et le boîtier (7),
    la cuvette (3) à membrane étant remplie d'un matériau de remplissage (15),
    caractérisé en ce que
    l'anneau de découplage (13) présente une lèvre (27) configurée de telle sorte qu'un interstice (31) soit formé entre la lèvre (27) et la paroi intérieure du boîtier et
    en ce que le matériau de remplissage (15) est repris dans un espace (33) fermé par la cuvette (3) à membrane et la lèvre (27) sur l'anneau de découplage (13).
  2. Capteur à ultrasons selon la revendication 1, caractérisé en ce que l'anneau de découplage (13) est réalisé en un matériau en caoutchouc élastique.
  3. Capteur à ultrasons selon la revendication 2, caractérisé en ce que le matériau en caoutchouc élastique est un caoutchouc naturel ou synthétique ou un élastomère thermoplastique.
  4. Capteur à ultrasons selon les revendications 2 ou 3, caractérisé en ce que le matériau en caoutchouc élastique est sélectionné parmi le caoutchouc naturel, les copolymères de styrène et de butadiène (SBR), le polybutadiène, le polyisoprène, le polychloroprène, le caoutchouc nitrile, le caoutchouc silicone, le polyisobutylène, le caoutchouc butyle, le caoutchouc d'éthylène et d'acétate de vinyle et les copolymères d'éthylène et de propylène (EPM/EPDM).
  5. Capteur à ultrasons selon l'une des revendications 1 à 4, caractérisé en ce que l'anneau de découplage (13) présente une symétrie de rotation et la lèvre (27) s'étend en direction axiale.
  6. Capteur à ultrasons selon l'une des revendications 1 à 5, caractérisé en ce que la hauteur de la lèvre (27) est sélectionnée de telle sorte que le matériau de remplissage (15) ne pénètre pas au-dessus de la lèvre (27) dans l'interstice (31) prévu entre l'anneau de découplage (13) et la paroi intérieure du boîtier.
  7. Capteur à ultrasons selon l'une des revendications 1 à 6, caractérisé en ce que l'anneau de découplage (13) présente une partie de contact (19) dans laquelle l'anneau de découplage (13) repose par un premier côté (21) sur la cuvette (3) à membrane et sur un côté (23) situé face au premier côté (21) sur le boîtier (7), l'anneau de découplage (13) présentant dans la partie de contact (19) au moins une nervure (25) de préférence périphérique.
  8. Capteur à ultrasons selon l'une des revendications 1 à 7, caractérisé en ce que le convertisseur acoustique (11) est un convertisseur piézo.
  9. Capteur à ultrasons selon l'une des revendications 1 à 8, caractérisé en ce que le matériau de remplissage (15) est une mousse polymère à cellules fermées.
  10. Capteur à ultrasons selon la revendication 9, caractérisé en ce que la mousse polymère est une mousse à base de silicone.
  11. Utilisation d'un capteur à ultrasons selon l'une des revendications 1 à 10 comme capteur de distance dans un système d'assistance au conducteur d'un véhicule automobile ou comme capteur de distance dans un véhicule sans conducteur.
EP12797803.9A 2012-01-17 2012-11-21 Capteur à ultrasons Active EP2805321B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012200639A DE102012200639A1 (de) 2012-01-17 2012-01-17 Ultraschallsensor
PCT/EP2012/073216 WO2013107542A1 (fr) 2012-01-17 2012-11-21 Capteur à ultrasons

Publications (2)

Publication Number Publication Date
EP2805321A1 EP2805321A1 (fr) 2014-11-26
EP2805321B1 true EP2805321B1 (fr) 2016-02-03

Family

ID=47297176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12797803.9A Active EP2805321B1 (fr) 2012-01-17 2012-11-21 Capteur à ultrasons

Country Status (4)

Country Link
EP (1) EP2805321B1 (fr)
CN (1) CN104040619B (fr)
DE (1) DE102012200639A1 (fr)
WO (1) WO2013107542A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022122435A1 (fr) * 2020-12-08 2022-06-16 Valeo Schalter Und Sensoren Gmbh Capteur d'ultrasons pour véhicule automobile, et véhicule automobile

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014115332A1 (de) * 2014-10-21 2016-04-21 Valeo Schalter Und Sensoren Gmbh Ultraschallsensorvorrichtung für ein Kraftfahrzeug, Anordnung sowie Kraftfahrzeug
DE102014115333A1 (de) * 2014-10-21 2016-04-21 Valeo Schalter Und Sensoren Gmbh Ultraschallsensor für ein Kraftfahrzeug, Anordnung, Kraftfahrzeug sowie Herstellungsverfahren
DE102014115339A1 (de) * 2014-10-21 2016-04-21 Valeo Schalter Und Sensoren Gmbh Ultraschallsensorvorrichtung für ein Kraftfahrzeug, Anordnung sowie Kraftfahrzeug
DE102015216200A1 (de) * 2015-08-25 2017-03-02 Robert Bosch Gmbh Akustischer Sensor mit einem Gehäuse und einem an diesem Gehäuse angeordneten Membranelement
DE102016221535A1 (de) 2016-11-03 2018-05-03 Robert Bosch Gmbh Ultraschallwandler
DE102017216868A1 (de) * 2017-09-25 2019-03-28 Robert Bosch Gmbh Schallwandler
DE102022130025B3 (de) 2022-11-14 2024-04-25 Tdk Electronics Ag Ultraschall-Wandler

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Publication number Priority date Publication date Assignee Title
DE19927797C1 (de) * 1999-06-18 2000-12-07 Fraunhofer Ges Forschung Ultraschallwandler und Verfahren zu seiner Herstellung
DE10156259A1 (de) * 2001-11-09 2003-05-22 Valeo Schalter & Sensoren Gmbh Ultraschallsensor und Verfahren zur Herstellung eines Ultraschallsensors
DE102004031310B4 (de) * 2004-06-29 2017-02-09 Robert Bosch Gmbh Membrantopf für einen Ultraschallwandler
DE102005013589A1 (de) * 2005-03-24 2006-09-28 Robert Bosch Gmbh Verfahren zur Funktionsüberprüfung eines Ultraschallsensors
DE102006028213A1 (de) 2006-06-14 2007-12-20 Valeo Schalter Und Sensoren Gmbh Ultraschallsensor mit Entkopplungselement
DE102006040344B4 (de) * 2006-08-29 2022-09-29 Robert Bosch Gmbh Haltevorrichtung für einen Ultraschallwandler
DE102006050037A1 (de) 2006-10-24 2008-04-30 Robert Bosch Gmbh Ultraschallwandler
DE102008014265A1 (de) * 2008-03-13 2009-09-17 Valeo Schalter Und Sensoren Gmbh Einbauanordnung für ein schwingungsempfindliches Bauteil
JP5574674B2 (ja) * 2009-11-12 2014-08-20 キヤノン株式会社 音響波測定装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022122435A1 (fr) * 2020-12-08 2022-06-16 Valeo Schalter Und Sensoren Gmbh Capteur d'ultrasons pour véhicule automobile, et véhicule automobile

Also Published As

Publication number Publication date
DE102012200639A1 (de) 2013-07-18
EP2805321A1 (fr) 2014-11-26
CN104040619B (zh) 2017-03-22
CN104040619A (zh) 2014-09-10
WO2013107542A1 (fr) 2013-07-25

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