CN101590790A - Surface transverse fluctuation mode tire pressure sensor - Google Patents
Surface transverse fluctuation mode tire pressure sensor Download PDFInfo
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- CN101590790A CN101590790A CNA2009100533081A CN200910053308A CN101590790A CN 101590790 A CN101590790 A CN 101590790A CN A2009100533081 A CNA2009100533081 A CN A2009100533081A CN 200910053308 A CN200910053308 A CN 200910053308A CN 101590790 A CN101590790 A CN 101590790A
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Abstract
A kind of surface transverse fluctuation mode tire pressure sensor of mechanical pick-up device technical field, comprise: the quartzy cantilever beam element of housing, cover plate, cantilever beam bearing and Li Min, wherein: housing is connected with cover plate for sealing, and the quartzy cantilever beam element of cantilever beam bearing and Li Min is fixedly set in enclosure interior respectively.Single port resonator works on the quick quartzy cantilever beam element of power is in the surface transverse fluctuation mode formula.The present invention has ability, fatigue durability and the very high stress sensitivity of anti-mechanical vibration, impact, need not adjust the requirement of range 0～1MPa tire pressure measurement that just can suit.
Description
Technical field
The present invention relates to a kind of device of mechanical pick-up device technical field, be specifically related to a kind of surperficial transversal wave movement (STW) pattern tire pressure sensor.
Background technology
The major traffic accidents that highway automobile is blown out and easily caused, if the interior pressure of tire is low excessively, squeegee action then, the deflection of tire increases, and therefore because the increase of friction, makes the sharply rising of tire temperature, thereby causes tire deliquescing, strength degradation.In addition, super heat can quicken the aging and distortion of radial-ply tyre steel wire and rubber, even causes the inside tires fracture.These factors all may produce the accident of blowing out.Among running car, because squeegee action can make tire shoulder wearing and tearing aggravation the fitfull wearing and tearing to occur.In addition,, cause resistance to motion to increase, cause consumption of fuel to increase because tire and ground-surface friction force increase.
When the tire pressure mal travelled, the increase of oil consumption will inevitably cause the increase of exhaust emission, and this also is a kind of pollution to environment.According to data report, when tire deflation travels, when air pressure descends 10% the time from normal value, its tire life will reduce 15%; If air pressure is lower than normal value 0.21KPa, oil consumption will increase by 1.5% so.If tire pressure is too high, then will make tire uphold distortion, carcass tension reduce, and automobile suffered minor load when travels down also increases.This moment is if run into physical shock, then can produce implosion or blows out.If the hypertonia of tire, the ground contact area of tire reduces so, thereby crown middle part quick-wearing so also can cause the explosion of taking turns crown part very much.
Not long ago " intelligent tire " of Wen Shiing can be monitored parameters such as tire pressure, temperature in real time, can give warning in advance to tyre break, avoid the generation of accidental disaster, can improve the traveling comfort of manipulative capability, saving fuel oil, the service life that prolongs tire and the raising vehicle of vehicle simultaneously effectively.The stability of surface acoustic wave (SAW) pressure-temperature sensor is high, frequency signal output, can adopt the work of wireless interrogated formula, can power supply need be installed in tire, is the outstanding person among " intelligent tire ".
There is following shortcoming in tire pressure sensor of the prior art: SAW intelligent tire pressure sensor almost all adopts the work of R wave pattern, its shortcoming is that Q value (quality factor) is not high, defective (cut, twin, pore) to wafer surface is very sensitive, anti-surface contamination (dust, greasy dirt, aqueous vapor) ability, aging characteristics is not good enough; Power conduction mechanism and elastic element all are to adopt the crystal cup structure, and not only range is narrow, and pressure sensitivity is low, the diaphragm thickness of crystal cup is difficult to processing evenly, thereby causes the strain distribution of diaphragm asymmetric, and constant characteristic is bad, pressure overload capacity is poor, and conformability is not good enough; The transferring structure of pressure---force transducer and power all is the Metal Packaging box of adopts pressure sensor and the bulge-structure on the box, the elasticity modulus of the elasticity modulus of metal box-lid bulge-structure and temperature factor and elastic element body and sensing device (all adopting quartz crystal materials) and temperature factor are also unequal usually, and not matching between them tends to produce " leading the slippage between power media and the elastic medium " and " occurring thermal stress in sensing device ".
Through the existing Searches of Patent Literature is found, number of patent application 200810200032.0 has been put down in writing a kind of " adopting the surface acoustic wave pressure sensor of superposable die ", this technology adopts the cylindrical shape of plunderring the face bulk wave mode and having a blind hole to lead the new-type cantilever beam structure of power tube, done bigger improvement at the problems referred to above, but because the thickness of pressure sensor is thicker, oad is bigger.In addition, complex structure, the suitable high-accuracy pressure sensor of this technology uses, and the usual pressure sensor that not too is fit to have a large capacity and a wide range uses.
Summary of the invention
The objective of the invention is to improve the deficiencies in the prior art, a kind of surface transverse fluctuation mode tire pressure sensor is provided, the present invention has the ability and the very high stress sensitivity of stronger anti-mechanical vibration and impact, and its sensitivity does not change with force application location; The main difficult problem of acoustic current surface wave pressure sensor design and production can be solved, the requirement that same pressure sensor need not adjusted range 0～1MPa tire pressure measurement that just can suit can be solved.
The present invention is achieved through the following technical solutions, the present invention includes: the quartzy cantilever beam element of housing, cover plate, cantilever beam bearing and Li Min, wherein: housing is connected with cover plate for sealing, and the quartzy cantilever beam element of cantilever beam bearing and Li Min is fixedly set in enclosure interior respectively.
Described housing is the rectangle frame body structure, and the end face of this housing is wavy curved-surface structure or planar structure, and the bottom surface of housing is the plane, and the madial wall of housing is provided with housing groove.
The middle part of the housing end face of described planar structure is provided with a thimble, and this thimble contacts with the cantilever beam bearing.
Described cover plate comprises: front shroud and back shroud, this front shroud and back shroud are tightly connected with the leading flank and the trailing flank of housing respectively.
Described cantilever beam bearing comprises load thing and balanced body, and wherein: the load thing is sphere or cylindrical structural; Balanced body is the cuboid structure, and a side of balanced body is captiveed joint with the edge of load thing, and the load thing contacts with the inboard, bottom surface of housing, and balanced body is suspended in the housing and with the end face or the bottom surface of housing and parallels.
Described load thing is provided with vee groove and miniature control apparatus, wherein: gap slot is connected with the end coupling of the quick quartzy cantilever beam element of power, miniature control apparatus is positioned at the top of load thing, and its position with respect to the center of gravity of load thing can change all around.
The quick quartzy cantilever beam element of described power is equicrural triangle or isosceles trapezoidal structure, and its thickness is 0.2mm～2mm.The two ends of the quick quartzy cantilever beam element of this power are respectively fixed end and free end.Wherein: the width of fixed end is greater than free-ended width.
The upper surface and the lower surface of the quick quartzy cantilever beam element of described power pass through optical grinding and polishing respectively, and are provided with the single port resonator of surface transverse fluctuation mode formula at upper surface, and lower plane is provided with the strain hardening groove.
The fixed end of the quick quartzy cantilever beam element of described power inserts in the housing groove of housing madial wall, and the free end of the quick quartzy cantilever beam element of power inserts in the gap slot of little arch cantilever beam bearing.Above-mentioned junction all utilizes adhesive bonds, and is provided with 1-3 the through hole with Surface Vertical at the weld of the quick quartzy cantilever beam element surface of power, and the center of circle of this through hole is positioned at inside, the cooresponding position of gap slot.
The quick quartzy cantilever beam element of described power is chosen the Eulerian angles variation range and is made for the quartz crystal materials of [0 °, 33 °～41 °, 0 °].
Quick quartzy cantilever beam element fixed end of described single port resonator and power and free-ended closure are perpendicular, and this single port resonator works is under the surface transverse fluctuation mode formula.
The load thing of thimble and cantilever beam bearing is little the contact with inboard, housing bottom surface on the balanced body of described cantilever beam bearing and the housing end face.
Described little contact is meant: spacing is zero, and contact pressure is less than 100 newton.
Described housing and thimble all are by commaterial, comprise what organic resin, plastics etc. constituted.
The present invention at first adjusts miniature control apparatus to change the moment of cantilever beam bearing, and making its spacing with inboard, housing bottom surface is zero, also is zero to the application force of inboard, housing bottom surface.When ambient pressure acts on the sensor, utilize the housing wavy surface that tested " pressure " is converted to " concentrated force " then, and utilize end face that " concentrated force " is delivered to pressure-sensing device---on the STW pressure responsive device.
The edge of the quick quartzy cantilever beam element of the power of equicrural triangle of the present invention or isosceles trapezoidal structure is of value to the reflection of reduction STW ripple at Waffer edge.The strain hardening groove (line of centers of this housing groove and fixed end and free-ended closure are perpendicular) that lower surface is provided with can be increased in the stress concentration effect of STW resonator area, improves its strain sensitivity, the resolution and the accuracy of raising sensor.Apex zone at fixed end, utilize anisotropic etching method or ultrasonic punch method to make some and the vertical through hole of the quick quartzy cantilever beam element surface of power, be delivered to the quick quartzy cantilever beam element surface of power so that prevent extraneous mechanical vibration, impact by the cantilever beam bearing, can reduce the interference of thermal stress simultaneously the pressure responsive device characteristic.Because the gummed point is very long to the distance in strain hardening district, above-mentioned interference stress decay is very big, and therefore, it will not introduce cantilever beam to thermal stress, thereby the present invention does not have the shortcoming that former beam type pressure sensor lag error is big, long-time stability are not good enough.
Description of drawings
Fig. 1 is a section-drawing of the present invention;
Fig. 2 a is a cantilever beam bearing section-drawing;
Fig. 2 b is a cantilever beam bearing birds-eye view;
Fig. 3 a is cantilever beam element section figure among the embodiment 1;
Fig. 3 b is a cantilever beam element birds-eye view among the embodiment 1;
Fig. 4 a is cantilever beam element section figure among the embodiment 2;
Fig. 4 b is a cantilever beam element birds-eye view among the embodiment 2.
The specific embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: the quartzy cantilever beam element 6 of housing 1, cover plate 13, cantilever beam bearing 8 and Li Min, wherein: housing 1 and sensor cover plate 13 are tightly connected, and the quartzy cantilever beam element 6 of cantilever beam bearing 8 and Li Min is fixedly set in housing 1 inside respectively.
Described housing 1 is the rectangle frame body structure, and the end face of this housing 1 is wavy curved surface, and the bottom surface of housing 1 is the plane, and the madial wall of housing 1 is provided with housing groove 15, and described housing 1 is made by polyimide resin.
Described cover plate 13 comprises: front shroud and back shroud, this front shroud and back shroud are tightly connected with the leading flank and the trailing flank of housing 1 respectively, and this cover plate 13 is made by polyimide resin.
Shown in Fig. 2 a and Fig. 2 b, described cantilever beam bearing 8 comprises: cylindrical load thing 9 and unsettled balanced body 12, wherein: a side of balanced body 12 is captiveed joint with the edge of load thing 9, load thing 9 contacts with the inboard, bottom surface of housing 1, and balanced body 12 is suspended in the housing 9 and with the end face or the bottom surface of housing 9 and parallels.
The cylindrical load thing 9 of described cantilever beam bearing 8 is provided with a leg-of-mutton gap slot 10, and this gap slot 10 is connected with the end coupling of the quick quartzy cantilever beam element 6 of power.
Also be provided with a miniature control apparatus 11 on the described cylindrical load thing 9, so that the moment of the quick quartzy cantilever beam element 6 of adjustment force makes it produce micro-strain, being little arch, is zero thereby make the distance of cylindrical load thing 9 and housing bottom surface 14 shell inner surface relative with described diaphragm.By the purpose that cylindrical load thing 9 and miniature control apparatus 11 are set is to produce micro-strain for the quick quartzy cantilever beam element 6 of exerting all one's strength; the sensitivity of further 6 pairs of concentrated forces of the quick quartzy cantilever beam element of raising power and the overload protection ability of improving pressure sensor; miniature control apparatus 11 also can be adjusted some characteristic of product simultaneously, improves consistency of product.
The quick quartzy cantilever beam element 6 of described power is an isosceles trapezoidal structure, and shown in Fig. 3 a and Fig. 3 b, the two ends of the quick quartzy cantilever beam element 6 of this power are respectively fixed end 19 and free end 20, and wherein: the width of fixed end 19 is greater than the width of free end 20.
Described free end 20 is bonding with gap slot 10, and described fixed end 19 is bonding with housing groove 15.
The upper surface and the lower surface of the quick quartzy cantilever beam element 6 of described power all pass through optical grinding and polishing, the upper surface of the quick quartzy cantilever beam element 6 of this power is provided with single port STW resonator 5, and the fixed end 19 of this single port resonator 5 and the quick quartzy cantilever beam element 6 of power and the closure of free end 20 are perpendicular; The lower surface of the quick quartzy cantilever beam element 6 of power and single port STW resonator 5 relative positions are provided with strain hardening groove 7, and the fixed end 19 of the quick quartzy cantilever beam element 6 of the line of centers of this housing groove 7 and power and the closure of free end 20 are perpendicular.First edge 17 of the quartz wafer of isosceles trapezoid 19 and second edge 18 are coarse rough and scribble sound absorption glue, are of value to and reduce the reflection of STW ripple at Waffer edge.
What the quick quartzy cantilever beam element 6 of described STW power adopted is the BT cut type, and Eulerian angles are the quartz crystal slice of [0,41 °, 0].Shadow region 22 representative is inserted in the above-mentioned housing groove 15, and with the zone of adhesion agent gummed.
Also be provided with 2 through holes 21 on the quick quartzy cantilever beam element 6 of described power, this through hole 21 specifically is positioned on the free end 20 of the quick quartzy cantilever beam element 6 of power the zone relative with cylindrical load thing 9.This through hole 21 can prevent that extraneous mechanical vibration, impact are delivered to the quick quartzy cantilever beam element of power 6 surfaces by cantilever beam bearing 8, can reduce the interference of thermal stress to the pressure responsive device characteristic simultaneously.
Highly sensitive 14 times of the conventional SAW pressure sensor of the quartzy thickness of the comparable grade of present embodiment pressure sensitivity, long-time stability are good simultaneously, and compressive resistance overload capacity is strong, and volume is little, and productive costs is low, the suitable production in enormous quantities in enormous quantities.
Shown in Fig. 4 a and Fig. 4 b, the quick quartzy cantilever beam element 6 of the power that relates among the embodiment 2 is isosceles triangular structure, the free end 20 of the quick quartzy cantilever beam element 6 of this power is bonding with gap slot 10, and the fixed end 19 of the quick quartzy cantilever beam element 6 of power is bonding with housing groove 15.
It is the quartz crystal slice of [0,33 °, 0] that the quick quartzy cantilever beam element of described STW power adopts Eulerian angles, and thickness is 0.5mm.Shadow region 22 representative is inserted in the above-mentioned housing groove 15, and with the zone of adhesion agent gummed.
Highly sensitive 16 times of the conventional SAW pressure sensor of the quartzy thickness of the comparable grade of present embodiment pressure sensitivity, long-time stability are good, and compressive resistance overload capacity is strong, and volume is little, is producing the position that applies of being convenient to the power of seeking when installing, the suitable production in enormous quantities in enormous quantities.
Claims (9)
1, a kind of surface transverse fluctuation mode tire pressure sensor, comprise: the quartzy cantilever beam element of housing, cover plate, cantilever beam bearing and Li Min, it is characterized in that: housing is connected with cover plate for sealing, and the quartzy cantilever beam element of cantilever beam bearing and Li Min is fixedly set in enclosure interior respectively; Described cantilever beam bearing comprises load thing and balanced body, and wherein: the load thing is sphere or cylindrical structural; Balanced body is the cuboid structure, and a side of balanced body is captiveed joint with the edge of load thing, and the load thing contacts with the inboard, bottom surface of housing, and balanced body is suspended in the housing and with the end face or the bottom surface of housing and parallels.
2, surface transverse fluctuation mode tire pressure sensor according to claim 1, it is characterized in that described housing is the rectangle frame body structure, the end face of this housing is wavy curved-surface structure or planar structure, the bottom surface of housing is the plane, and the madial wall of housing is provided with housing groove.
3, surface transverse fluctuation mode tire pressure sensor according to claim 2 is characterized in that, the middle part of the housing end face of described planar structure is provided with a thimble, and this thimble contacts with the cantilever beam bearing.
4, surface transverse fluctuation mode tire pressure sensor according to claim 1, it is characterized in that, described load thing is provided with vee groove and miniature control apparatus, wherein: gap slot is connected with the end coupling of the quick quartzy cantilever beam element of power, and miniature control apparatus is positioned at the top of load thing.
5, surface transverse fluctuation mode tire pressure sensor according to claim 1, it is characterized in that, the quick quartzy cantilever beam element of described power is equicrural triangle or isosceles trapezoidal structure, the through hole that is provided with 1-3 and Surface Vertical of the quick quartzy cantilever beam element surface of this power.
6, surface transverse fluctuation mode tire pressure sensor according to claim 1 or 5 is characterized in that the two ends of the quick quartzy cantilever beam element of described power are respectively fixed end and free end, and wherein: the width of fixed end is greater than free-ended width.
7, surface transverse fluctuation mode tire pressure sensor according to claim 6, it is characterized in that, the upper surface of the quick quartzy cantilever beam element of described power is provided with the single port resonator of surface transverse fluctuation mode formula, and the lower surface of the quick quartzy cantilever beam element of power is provided with the strain hardening groove.
According to claim 1 or 4 or 5 described surface transverse fluctuation mode tire pressure sensors, it is characterized in that 8, the quick quartzy cantilever beam element of described power is chosen the Eulerian angles variation range and made for the quartz crystal materials of [0 °, 33 °～41 °, 0 °].
9, surface transverse fluctuation mode tire pressure sensor according to claim 6 is characterized in that, quick quartzy cantilever beam element fixed end of described single port resonator and power and free-ended closure are perpendicular, are operated under the surface transverse fluctuation mode formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100533081A CN101590790B (en) | 2009-06-18 | 2009-06-18 | Surface transverse fluctuation mode tire pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100533081A CN101590790B (en) | 2009-06-18 | 2009-06-18 | Surface transverse fluctuation mode tire pressure sensor |
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| CN101590790A true CN101590790A (en) | 2009-12-02 |
| CN101590790B CN101590790B (en) | 2011-04-06 |
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| CN2009100533081A Active CN101590790B (en) | 2009-06-18 | 2009-06-18 | Surface transverse fluctuation mode tire pressure sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090299570A1 (en) * | 2006-05-22 | 2009-12-03 | Continental Teves Ag & Co. Ohg | Tire Module and Method For Sensing Wheel State Variables and/or Tire State Variables |
| RU2457451C2 (en) * | 2010-04-13 | 2012-07-27 | Федеральное государственное казенное военное образовательное учреждение высшего профессионального образования "Военная академия войсковой противовоздушной обороны Вооруженных Сил Российской Федерации имени Маршала Советского Союза А.М.Василевского" Министерства обороны Российской Федерации | Pressure sensor |
| CN103090778A (en) * | 2012-12-20 | 2013-05-08 | 太原理工大学 | Strain type linear bidirectional large displacement sensor and detection method thereof |
| CN105185753A (en) * | 2015-08-13 | 2015-12-23 | 北京中科飞鸿科技有限公司 | Single bare surface acoustic wave chip miniaturized package based on LTCC technology |
| CN108240880A (en) * | 2017-12-06 | 2018-07-03 | 上海交通大学 | The surface acoustic wave sensor sensitization structure of bionical spider lyrate susceptor structures |
-
2009
- 2009-06-18 CN CN2009100533081A patent/CN101590790B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090299570A1 (en) * | 2006-05-22 | 2009-12-03 | Continental Teves Ag & Co. Ohg | Tire Module and Method For Sensing Wheel State Variables and/or Tire State Variables |
| RU2457451C2 (en) * | 2010-04-13 | 2012-07-27 | Федеральное государственное казенное военное образовательное учреждение высшего профессионального образования "Военная академия войсковой противовоздушной обороны Вооруженных Сил Российской Федерации имени Маршала Советского Союза А.М.Василевского" Министерства обороны Российской Федерации | Pressure sensor |
| CN103090778A (en) * | 2012-12-20 | 2013-05-08 | 太原理工大学 | Strain type linear bidirectional large displacement sensor and detection method thereof |
| CN103090778B (en) * | 2012-12-20 | 2015-10-28 | 太原理工大学 | A kind of strain-type Linear Double is to large displacement sensor and detection method thereof |
| CN105185753A (en) * | 2015-08-13 | 2015-12-23 | 北京中科飞鸿科技有限公司 | Single bare surface acoustic wave chip miniaturized package based on LTCC technology |
| CN108240880A (en) * | 2017-12-06 | 2018-07-03 | 上海交通大学 | The surface acoustic wave sensor sensitization structure of bionical spider lyrate susceptor structures |
| CN108240880B (en) * | 2017-12-06 | 2020-07-14 | 上海交通大学 | Surface acoustic wave sensor sensitivity increasing structure of bionic spider piano-shaped receptor structure |
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| CN101590790B (en) | 2011-04-06 |
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