WO2012080991A1 - Microantenna and transmitter device for monitoring the pressure of a tire of a motor-vehicle - Google Patents

Microantenna and transmitter device for monitoring the pressure of a tire of a motor-vehicle Download PDF

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Publication number
WO2012080991A1
WO2012080991A1 PCT/IB2011/055745 IB2011055745W WO2012080991A1 WO 2012080991 A1 WO2012080991 A1 WO 2012080991A1 IB 2011055745 W IB2011055745 W IB 2011055745W WO 2012080991 A1 WO2012080991 A1 WO 2012080991A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit board
tire
antenna
board
battery
Prior art date
Application number
PCT/IB2011/055745
Other languages
French (fr)
Inventor
Salvatore Cappitella
Aniello Cambio
Original Assignee
Bitron S.P.A.
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 Bitron S.P.A. filed Critical Bitron S.P.A.
Publication of WO2012080991A1 publication Critical patent/WO2012080991A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
    • B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
    • B60C23/0433—Radio signals
    • B60C23/0447—Wheel or tyre mounted circuits
    • B60C23/0452—Antenna structure, control or arrangement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0491—Constructional details of means for attaching the control device
    • B60C23/0496—Valve stem attachments positioned outside of the tyre chamber

Definitions

  • the present invention relates to a microantenna which can be used particularly, but not exclusively, in a transmitter device for monitoring the pressure of a tire of a motor vehicle.
  • One object of the present invention is to provide an improved microantenna which can be simply and economically manufactured and which has characteristics including limited dispersion and good stability over time.
  • microantenna comprising:
  • a support structure including an annular member of an electrically insulating material, in an external surface of which there is provided a helical groove, and to which a circuit board is coupled, which extends in a plane orthogonal to the axis of the annular member, at one end thereof;
  • a wire of an electrically conducting material wound in the groove of the annular member, and having a first end which engages holding means of the annular support member, and a second end which is fastened to the circuit board.
  • the present invention also proposes a radio transmitter device, particularly a device for monitoring the pressure in a tire of a motor vehicle, comprising a microantenna having the characteristics defined above.
  • this radio transmitter comprises
  • a mass of an electrically insulating sealing material which incorporates the circuit board in such a way as to leave the transducer uncovered, and which incorporates further a portion of the antenna adjacent to the board, and preferably at least part of the battery, in such a way that the antenna, the board and the battery form a monolithic assembly.
  • a radio transmitter of this type also comprises a supporting casing which has an opening that can be coupled pneumatically to an inflating valve of a tire, the casing housing the aforesaid monolithic assembly including the antenna, the circuit board and the battery, in such a way that the opening of the casing is in pneumatic communication with a region which the pressure transducer faces.
  • Figure 1 is a sectional view of a device for monitoring the pressure in a tire of a motor vehicle, comprising a microantenna and a radio transmitter according to the present invention
  • Figure 2 is a perspective view which shows an annular support member and an associated wire of electrically conducting material for an antenna according to the present invention
  • Figure 3 is a perspective view which shows a radio transmitter including an antenna according to the invention.
  • Figure 4 is a sectional view taken along the line IV-IV of Figure 3.
  • the number 1 indicates the whole of a device for monitoring the pressure (and possibly also the temperature) of a tire of a motor vehicle.
  • the device comprises an extension tube 2, made of metallic material for example, a first end 2a of which can be coupled sealingly to the mouth of an inflating valve of a tire, while its other end 2b is provided with a removable plug 3 for sealed closing.
  • extension tube 2 there is formed an axial conduit 4, which during use is in pneumatic communication with the inside of the tire with which the device 1 is associated.
  • the intermediate portion of the extension tube 2 has a projecting lateral formation 5, in which is formed a transverse passage 6 in communication with the conduit 4.
  • the extension tube 2 is laterally connected, by welding for example, to a support casing indicated as a whole by 7.
  • this support casing comprises an essentially cup-shaped member 8, made of metallic material for example, which in its base wall has an opening 8a into which the formation 5 of the extension tube 2 sealingly extends.
  • the cup-shaped body 8 is coupled to a body 9 essentially in the form of an inverted socket. In the illustrated exemplary embodiment, the mouth of the body 8 is turned down on to the body 9.
  • the assembly 1 1 includes an antenna 12 with a circuit board 13 and a voltage supply battery 14.
  • the antenna 12, the circuit board 13 and the battery 14 are conveniently incorporated, at least partially, by moulding into a mass 15 of an electrically insulating sealing, and possibly vibration damping, material.
  • the antenna 12 which, owing to its small dimensions, is also termed a “microantenna” herein, comprises a support structure which includes an annular member 16 of electrically insulating material, coupled to the circuit board 13.
  • the annular member 16 has a helical groove 17 in its outer lateral surface, a wire 18 of electrically conducting material, preferably tinned copper, being wound in this groove.
  • the conducting wire 18 forms the radiating member of the antenna, and has a first end 18a ( Figures 2 and 3) bent in an approximately radial direction and engaged and retained by a holder 19 which is conveniently made in one piece with the annular support member 16.
  • the other end of the conducting wire 18, indicated by 18b in Figures 2 and 3, is bent in a direction at least approximately parallel to the axis of the annular member 16, and extends through a corresponding through hole formed in the circuit board 13 ( Figure 3), to which it is fixed, by soldering for example.
  • the annular support member 16 has in its lower part a pair of sprung appendages 20, with retaining catches 20a at their distal ends (Figure 2). These appendages 20 engage in corresponding peripheral recesses 13a of the circuit board 13 ( Figure 3), by means of their catches 20a which engage under the board.
  • the circuit board 13 carries an electrical pressure transducer indicated by 21, and possibly also a temperature sensor, on its upper face.
  • the board 13 also carries a plurality of further electrical and/or electronic components, indicated as a whole by 22.
  • Conducting strips 24 for the connection of the battery 14 are also connected to the board 13.
  • the mass 15 of electrically insulating material incorporates the lower portion of the antenna 12, the circuit board and the components of the latter - with the exception of the pressure transducer 21, as stated above - and at least a part of the battery 14.
  • the assembly 1 1 formed in this way can be handled individually and can easily be mounted in the region or chamber 10 formed in the support casing 7 ( Figure 1).
  • the arrangement is such that the portion of the region 10 located above the pressure transducer 21 is in pneumatic communication with the passage 6 of the extension tube 2, and therefore with the conduit 4 formed in this tube.
  • the transducer 21 is capable of generating electrical signals indicating the pressure in the tire with which the monitoring device 1 is associated for operation. These signals are processed by the devices 22 carried on the circuit board 13, and are transmitted by the antenna 12 to a receiving, processing and control device mounted on board the motor vehicle.
  • a resilient ring seal 25 (Figure 1) is positioned in an outer annular recess 26 of the body 9, so as to be radially compressed between the body 9 and the lateral wall of the body 8. This resilient ring seal 25 prevents the pneumatic communication of the passage 6 with the region in which the pressure transducer, and the temperature transducer, if used, are not present.
  • the annular support member 16 is made individually by moulding a plastic material having a predetermined dielectric constant.
  • the method of individual moulding is preferable to the method of producing the annular support member by cutting from an insulating tube, since it provides greater precision and reproducibility of dimensions.
  • the winding of the conducting wire 18 in the groove of the annular support member 16 provides greater dimensional stability and less dispersion of the characteristics of the antenna compared with solutions using free spiral wire in air. Additionally, greater dimensional stability of the conducting wire 18 is provided throughout the service life of the device, even in the presence of high mechanical stresses.

Abstract

The microantenna (12) comprises a support structure (16, 13) including an annular member (16) of an electrically insulating material, in an external surface of which there is provided a helical groove (17), and to which a circuit board (13) is coupled, which extends in a plane orthogonal to the axis of the annular member (16), at one end thereof; and a wire (18) of an electrically conducting material, wound in the groove (17) of the annular member (16), and having a first end (18a) which engages holding means (19) of the annular member (16), and a second end (18b) which is fastened to the circuit board (13).

Description

Microantenna and transmitter device for monitoring the pressure of a tire of a motor vehicle
The present invention relates to a microantenna which can be used particularly, but not exclusively, in a transmitter device for monitoring the pressure of a tire of a motor vehicle.
One object of the present invention is to provide an improved microantenna which can be simply and economically manufactured and which has characteristics including limited dispersion and good stability over time.
This and other objects are achieved according to the invention with a microantenna comprising:
a support structure including an annular member of an electrically insulating material, in an external surface of which there is provided a helical groove, and to which a circuit board is coupled, which extends in a plane orthogonal to the axis of the annular member, at one end thereof; and
a wire of an electrically conducting material, wound in the groove of the annular member, and having a first end which engages holding means of the annular support member, and a second end which is fastened to the circuit board.
The present invention also proposes a radio transmitter device, particularly a device for monitoring the pressure in a tire of a motor vehicle, comprising a microantenna having the characteristics defined above.
In one embodiment, this radio transmitter comprises
an electric pressure transducer and associated transmission circuits carried by the circuit board of the antenna,
a voltage supply battery having terminals fixed to the circuit board and connected to the circuits carried on this board, and
a mass of an electrically insulating sealing material, which incorporates the circuit board in such a way as to leave the transducer uncovered, and which incorporates further a portion of the antenna adjacent to the board, and preferably at least part of the battery, in such a way that the antenna, the board and the battery form a monolithic assembly.
For the purpose of monitoring the pressure in a tire of a motor vehicle, a radio transmitter of this type also comprises a supporting casing which has an opening that can be coupled pneumatically to an inflating valve of a tire, the casing housing the aforesaid monolithic assembly including the antenna, the circuit board and the battery, in such a way that the opening of the casing is in pneumatic communication with a region which the pressure transducer faces.
Further characteristics and advantages of the invention will be made clear by the following detailed description, provided purely by way of non-limiting example, with reference to the appended drawings, in which:
Figure 1 is a sectional view of a device for monitoring the pressure in a tire of a motor vehicle, comprising a microantenna and a radio transmitter according to the present invention;
Figure 2 is a perspective view which shows an annular support member and an associated wire of electrically conducting material for an antenna according to the present invention;
Figure 3 is a perspective view which shows a radio transmitter including an antenna according to the invention; and
Figure 4 is a sectional view taken along the line IV-IV of Figure 3.
In Figure 1, the number 1 indicates the whole of a device for monitoring the pressure (and possibly also the temperature) of a tire of a motor vehicle.
In the illustrated exemplary embodiment, the device comprises an extension tube 2, made of metallic material for example, a first end 2a of which can be coupled sealingly to the mouth of an inflating valve of a tire, while its other end 2b is provided with a removable plug 3 for sealed closing.
In the extension tube 2 there is formed an axial conduit 4, which during use is in pneumatic communication with the inside of the tire with which the device 1 is associated. The intermediate portion of the extension tube 2 has a projecting lateral formation 5, in which is formed a transverse passage 6 in communication with the conduit 4.
Around the projecting formation 5, the extension tube 2 is laterally connected, by welding for example, to a support casing indicated as a whole by 7. In the illustrated exemplary embodiment, this support casing comprises an essentially cup-shaped member 8, made of metallic material for example, which in its base wall has an opening 8a into which the formation 5 of the extension tube 2 sealingly extends. The cup-shaped body 8 is coupled to a body 9 essentially in the form of an inverted socket. In the illustrated exemplary embodiment, the mouth of the body 8 is turned down on to the body 9.
Between the bodies 8 and 9 which combine to form the support casing 7, there is formed a region or chamber 10, in which is mounted an assembly indicated as a whole by 11.
As described more fully below, the assembly 1 1 includes an antenna 12 with a circuit board 13 and a voltage supply battery 14.
The antenna 12, the circuit board 13 and the battery 14 are conveniently incorporated, at least partially, by moulding into a mass 15 of an electrically insulating sealing, and possibly vibration damping, material.
With reference to Figures 2 to 4, the antenna 12 which, owing to its small dimensions, is also termed a "microantenna" herein, comprises a support structure which includes an annular member 16 of electrically insulating material, coupled to the circuit board 13.
The annular member 16 has a helical groove 17 in its outer lateral surface, a wire 18 of electrically conducting material, preferably tinned copper, being wound in this groove.
The conducting wire 18 forms the radiating member of the antenna, and has a first end 18a (Figures 2 and 3) bent in an approximately radial direction and engaged and retained by a holder 19 which is conveniently made in one piece with the annular support member 16. The other end of the conducting wire 18, indicated by 18b in Figures 2 and 3, is bent in a direction at least approximately parallel to the axis of the annular member 16, and extends through a corresponding through hole formed in the circuit board 13 (Figure 3), to which it is fixed, by soldering for example.
The annular support member 16 has in its lower part a pair of sprung appendages 20, with retaining catches 20a at their distal ends (Figure 2). These appendages 20 engage in corresponding peripheral recesses 13a of the circuit board 13 (Figure 3), by means of their catches 20a which engage under the board.
As is shown more fully in Figure 4, the circuit board 13 carries an electrical pressure transducer indicated by 21, and possibly also a temperature sensor, on its upper face. The board 13 also carries a plurality of further electrical and/or electronic components, indicated as a whole by 22.
On the upper face of the board 13, around the pressure transducer 21 , there is a tubular protective member 23 (Figures 1, 3 and 4), fixed by gluing for example, the functions of which are described below.
Conducting strips 24 for the connection of the battery 14 are also connected to the board 13.
When the antenna 12 has been assembled together with the circuit board 13 and the battery 14, as shown in Figures 3 and 4, this assembly is conveniently placed in a mould into which an electrically insulating sealing material is poured to form the mass indicated by 15 in Figure 1. During this operation, the tubular element 23 prevents the poured material from incorporating the pressure transducer 21 and any associated temperature sensor.
As shown in Figure 1, the mass 15 of electrically insulating material incorporates the lower portion of the antenna 12, the circuit board and the components of the latter - with the exception of the pressure transducer 21, as stated above - and at least a part of the battery 14. The assembly 1 1 formed in this way can be handled individually and can easily be mounted in the region or chamber 10 formed in the support casing 7 (Figure 1). In the assembled condition (Figure 1), the arrangement is such that the portion of the region 10 located above the pressure transducer 21 is in pneumatic communication with the passage 6 of the extension tube 2, and therefore with the conduit 4 formed in this tube. In use, therefore, the transducer 21 is capable of generating electrical signals indicating the pressure in the tire with which the monitoring device 1 is associated for operation. These signals are processed by the devices 22 carried on the circuit board 13, and are transmitted by the antenna 12 to a receiving, processing and control device mounted on board the motor vehicle.
A resilient ring seal 25 (Figure 1) is positioned in an outer annular recess 26 of the body 9, so as to be radially compressed between the body 9 and the lateral wall of the body 8. This resilient ring seal 25 prevents the pneumatic communication of the passage 6 with the region in which the pressure transducer, and the temperature transducer, if used, are not present.
Conveniently, the annular support member 16 is made individually by moulding a plastic material having a predetermined dielectric constant. The method of individual moulding is preferable to the method of producing the annular support member by cutting from an insulating tube, since it provides greater precision and reproducibility of dimensions.
The winding of the conducting wire 18 in the groove of the annular support member 16 provides greater dimensional stability and less dispersion of the characteristics of the antenna compared with solutions using free spiral wire in air. Additionally, greater dimensional stability of the conducting wire 18 is provided throughout the service life of the device, even in the presence of high mechanical stresses.
Clearly, provided that the principle of the invention is retained, the forms of application and the details of construction can be varied widely from what has been described and illustrated purely by way of non-limiting example, without thereby departing from the scope of protection of the invention as defined by the attached claims.

Claims

1. Microantenna (12), particularly for a device (1) for monitoring the pressure, and possibly the temperature, of a tire of a motor vehicle, comprising
a support structure (16, 13) including an annular member (16) of an electrically insulating material, in an external surface of which there is provided a helical groove (17), and to which a circuit board (13) is coupled, which extends in a plane orthogonal to the axis of the annular member (16), at one end thereof; and
a wire (18) of an electrically conducting material, wound in the groove (17) of the annular member (16), and having a first end (18a) which engages holding means (19) of the annular support member (16), and a second end (18b) which is fastened to the circuit board (13).
2. Radio transmitter (11), particularly for a device (1) for monitoring the pressure, and possibly the temperature, of a tire of a motor vehicle, comprising a microantenna (12) according to Claim 1.
3. Radio transmitter according to Claim 2, comprising
an electric pressure transducer (21) and associated transmission circuits (22) carried by the circuit board (13) of the antenna (12),
a voltage supply battery (14) having terminals (24) fixed to the circuit board (13) and connected to circuits and devices (13) carried by the board (13), and
a mass (15) of an electrically insulating sealing material, possibly a vibration damping material, which incorporates the circuit board (13) in such a way as to leave the transducer (21) uncovered, and which incorporates further a portion of the antenna (12) adjacent to the board (13), and preferably at least part of the battery (14), in such a way that the antenna (12), the board (13) and the battery (14) form a monolithic assembly (1 1).
4. Radio transmitter according to Claim 3, comprising a support casing (7, 8) having an opening (8a) adapted to be pneumatically coupled to an inflating valve of a tire, and wherein there is mounted the aforesaid monolithic assembly (12) including the antenna (12), the circuit board (13), the battery (14) and a ring seal (25), in such a way that the region (10) inside the casing (7) is, in use, in communication only with the region inside the tire with which the device (1) is associated.
5. Radio transmitter according to Claim 4, wherein the casing is coupled laterally to an extension tube (2) having one end (2a) adapted to be sealingly coupled to an inflating valve of a tire, and the other end (2b) provided with a removable sealing cap (3), the aforesaid opening (8a) of the casing (7) being in pneumatic communication with a conduit (4) formed in the extension tube (2).
PCT/IB2011/055745 2010-12-17 2011-12-16 Microantenna and transmitter device for monitoring the pressure of a tire of a motor-vehicle WO2012080991A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2010A001009A IT1403407B1 (en) 2010-12-17 2010-12-17 MICROANTENNA AND TRANSMITTER DEVICE FOR THE MONITORING OF THE PRESSURE OF A TIRE OF A MOTOR VEHICLE
ITTO2010A001009 2010-12-17

Publications (1)

Publication Number Publication Date
WO2012080991A1 true WO2012080991A1 (en) 2012-06-21

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Application Number Title Priority Date Filing Date
PCT/IB2011/055745 WO2012080991A1 (en) 2010-12-17 2011-12-16 Microantenna and transmitter device for monitoring the pressure of a tire of a motor-vehicle

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IT (1) IT1403407B1 (en)
WO (1) WO2012080991A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112019007548B4 (en) 2019-07-16 2023-12-07 Hamaton Automotive Technology Co., Ltd. Commercial vehicle TPMS air valve and TPMS sensor assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6101870A (en) * 1997-11-10 2000-08-15 Pacific Industrial Co., Ltd. Tire air pressure monitoring device using the wheel or a coil wound around the stem as the transmitter antenna
FR2845031A1 (en) * 2002-09-26 2004-04-02 Siemens Vdo Automotive Mounting for tire pressure sensor comprises hollow rivet which fits into aperture in wheel rim, through which tire valve protrudes, head of rivet fitting over sensor casing
WO2008022842A1 (en) * 2006-08-21 2008-02-28 Robert Bosch Gmbh Tyre sensor module and method for its production
DE102007043077A1 (en) * 2007-09-10 2009-03-12 Robert Bosch Gmbh Sensor arrangement and method for operating a sensor arrangement
WO2011015990A1 (en) * 2009-08-04 2011-02-10 Eltek S.P.A. Device for monitoring a vehicle wheel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6101870A (en) * 1997-11-10 2000-08-15 Pacific Industrial Co., Ltd. Tire air pressure monitoring device using the wheel or a coil wound around the stem as the transmitter antenna
FR2845031A1 (en) * 2002-09-26 2004-04-02 Siemens Vdo Automotive Mounting for tire pressure sensor comprises hollow rivet which fits into aperture in wheel rim, through which tire valve protrudes, head of rivet fitting over sensor casing
WO2008022842A1 (en) * 2006-08-21 2008-02-28 Robert Bosch Gmbh Tyre sensor module and method for its production
DE102007043077A1 (en) * 2007-09-10 2009-03-12 Robert Bosch Gmbh Sensor arrangement and method for operating a sensor arrangement
WO2011015990A1 (en) * 2009-08-04 2011-02-10 Eltek S.P.A. Device for monitoring a vehicle wheel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112019007548B4 (en) 2019-07-16 2023-12-07 Hamaton Automotive Technology Co., Ltd. Commercial vehicle TPMS air valve and TPMS sensor assembly

Also Published As

Publication number Publication date
IT1403407B1 (en) 2013-10-17
ITTO20101009A1 (en) 2012-06-18

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