CN1963486A - Gas sensor - Google Patents
Gas sensor Download PDFInfo
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- CN1963486A CN1963486A CN 200610144529 CN200610144529A CN1963486A CN 1963486 A CN1963486 A CN 1963486A CN 200610144529 CN200610144529 CN 200610144529 CN 200610144529 A CN200610144529 A CN 200610144529A CN 1963486 A CN1963486 A CN 1963486A
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- Prior art keywords
- side insulator
- atmospheric side
- gas sensor
- projection
- keeps
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- 239000012212 insulator Substances 0.000 claims abstract description 148
- 238000012423 maintenance Methods 0.000 claims description 13
- 239000007789 gas Substances 0.000 description 83
- 238000010586 diagram Methods 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 101000793686 Homo sapiens Azurocidin Proteins 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- Measuring Oxygen Concentration In Cells (AREA)
Abstract
A gas sensor is disclosed having an element holder body with which a senor element is fixedly supported, and an atmosphere-side insulator covering a base portion of the sensor element and providing electrical connection between lead wires and terminal electrodes of the sensor element. The element holder body includes a housing and an element-side insulator fixedly mounted in the housing. The atmosphere-side insulator incorporates therein a plurality of spring terminals held in electrical contact with the electrode terminals of the sensor element. At least one of the element holder body and the atmosphere-side insulator carries thereon convexed portions with which the atmosphere-side insulator can tilt with respect to the element holder body.
Description
The mutual reference of related application
The application relates to Japanese patent application No. 2005-326464 and the 2006-192590 that submits to respectively on November 10th, 2005 and on July 13rd, 2006, and the content of these applications is incorporated into this for your guidance.
Technical field
The present invention relates to be used for to detect gas sensor in the concentration of the specific gas of gas to be measured.
Background technology
In correlation technique, a common practice is to have waste gas system in the internal combustion engine of motor vehicles, and gas sensor is installed on the waste gas system to detect the concentration of the specific gas as oxygen or nitrogen oxide that contains in waste gas.
An example of this gas sensor is open in Japanese unexamined patent publication No. publication number 2003-294684.This correlation technique at Figure 14 to shown in Figure 17.As shown in figure 14, gas sensor 9 comprises a sensing element 92 that is made of tabular bar, and it has a test section and is used for detecting concentration at the specific gas of measurement gas, in the test section insertion element side insulator 93 and be supported by it.Component side insulator 93 is arranged in the housing 94 and is supported by it.Sensing element 92 has last cardinal extremity, and it is coated with the atmospheric side insulator 95 of axially aligning setting with component side insulator 93.And housing 94 has cardinal extremity, and it supports atmosphere side cover 96 regularly, and atmospheric side insulator 95 is covered by this lid.
The last cardinal extremity of sensing element 92 has the facing surfaces that is formed with the electrode terminal 921 that is electrically connected with the test section.Atmospheric side insulator inside holds a plurality of spring terminals 972, and spring terminal keeps electrically contacting to provide between electrode terminal 921 and lead 971 being electrically connected with the electrode terminal 921 of sensing element 92.By this structure, atmospheric side insulator 95 is installed on the cardinal extremity part of sensing element 92, covering it, thereby allow the electrode terminal 921 pressure contact of spring terminal 972 beginnings with sensing element 92.
By the structure that proposes above, under the situation that the axial direction with respect to element retainer 934 tilts, sensing element 92 is easy to keep by the element retainer 934 that is made of housing 94 and component side insulator 93.In this case, as shown in figure 15, if attempt atmospheric side insulator 95 is arranged on the upper surface of element retainer 934, make an end face 951 of atmospheric side insulator 95 keep contacting with a cardinal extremity face 935 of element retainer 934, the position relation between the electrode terminal 921 of spring terminal 972 that is contained in atmospheric side insulator 95 inside and sensing element 92 worsens.This causes electrically contacting the generation defective between the electrode terminal 921 of spring terminal 972 and sensing element 92.
And owing to need miniaturization on sensing element 92 structures, sensing element 92 need have narrow width.For the structure of such sensing element 92, electrode terminal 921 also needs to have extremely narrow width.Therefore, the width that is formed at the electrode terminal 921 on the sensing element 92 is narrow more, and the generation that the inefficacy between the electrode terminal of spring terminal 972 and sensing element 92 electrically contacts is just frequent more.
At this problem, imagined and make atmospheric side insulator 95 be formed with the inwall 95a that diameter reduces, between the periphery of the endoporus 95a of atmospheric side insulator 95 and sensing element 92, provide narrow gap 95b, as shown in figure 16.Yet, for this structure, if atmospheric side insulator 95 is placed on a position relevant with the upper surface of element retainer 934, and sensing element 92 is supported with the state that favours element retainer 934, then causes danger easily between the inwall 95a of the cardinal extremity of sensing element 92 and atmospheric side insulator 95.This causes sensing element 92 to damage.
For fear of this problem, also imagined atmospheric side insulator 95 was arranged to and sensing element 92 positions relevant rather than that be correlated with element retainer 934, to guarantee correct conductivity between electrode terminal 921 and the spring terminal 972, avoid the interference between sensing element 92 and the atmospheric side insulator 95 simultaneously, as shown in figure 17.For this structure, attempted making the axis of sensing element 92 and the axis of atmospheric side insulator 95 to be in alignment with each other, even sensing element 92 is fixing under the situation that favours element retainer 934, it is floating from element retainer 934 that atmospheric side insulator 95 keeps in the case.
Yet for sensing element 92 was fixed under the situation that favours element retainer 934, it is structurally unstable that atmospheric side insulator 95 becomes.In this case, the corner regions 952 and the element retainer 934 of the end face 951 of atmospheric side insulator 95 are conflicted easily, cause the electrode terminal 921 of sensing element 92 to damage.
Summary of the invention
The present invention is intended to solve top problem, and an object of the present invention is to provide a kind of gas sensor, it can guarantee to have well between the spring terminal of the electrode terminal of sensing element and atmospheric side insulator and electrically contact, and makes described atmospheric side insulator stably to be provided with respect to the element retainer simultaneously.
In order to realize top purpose, one aspect of the present invention provides a kind of gas sensor, it comprises that element keeps body, and described element keeps body to comprise the housing on the gas channel that can be installed in gas to be measured and is fixedly fastened on a insulating part on the described housing.A sensing element that is fixedly fastened on the described insulating part has a cardinal extremity, and the apparent surface of described cardinal extremity is formed with a plurality of electrode terminals respectively.An atmospheric side insulator has covered the described cardinal extremity of described sensing element, and inside is combined with a plurality of spring terminals that keep in touch with described electrode terminal respectively.Keep being provided with a tilting gearing between the body at described atmospheric side insulator and described element, in order to allow described atmospheric side insulator on a plane on the surface that is parallel to described sensing element with given inclined at inclination angles.
For the gas sensor that proposes above, described atmospheric side insulator is arranged on element and keeps body neighbouring to mate with described sensing element in the axial direction.That is to say that described tilting gearing is arranged on described atmospheric side insulator and described element keeps between the body, to allow the relevant setting of described atmospheric side insulator rather than to keep the relevant setting of body with described element with described sensing element.By this structure, even favouring described sensing element, described sensing element keeps body, the situation that described electrode terminal with described sensing element breaks away from also can not take place in the described spring terminal of described atmospheric side insulator, thereby guarantees conductivity between described spring terminal and the described electrode terminal in the mode of high reliability very.
For the gas sensor of present embodiment, described tilting gearing can comprise along an axis parallel with the bias voltage direction of each described spring terminal and is formed at projection on the far-end of described atmospheric side insulator.
And for the gas sensor of present embodiment, described tilting gearing can comprise that being formed at described element along an axis parallel with the bias voltage direction of each described spring terminal keeps projection on the cardinal extremity of body.
For this structure, described atmospheric side insulator is supported on described element by described tilting gearing and keeps on the body, and can place with stable manner.And, suppose that described tilting gearing can make described atmospheric side insulator keep keeping the body next-door neighbour to engage with described element, with its inclination relatively.Therefore, described atmospheric side insulator can become free variable angle tilt to keep body with respect to described element.As a result, described atmospheric side insulator can have a down dip at given angle according to the angle of inclination of described sensing element.
For the gas sensor of present embodiment, described element keeps body can comprise an atmosphere side cover, and it is fixedly secured a cardinal extremity at described housing to cover described atmospheric side insulator; With an interior guard circle cylinder, the zone that it is arranged on described atmosphere side cover inside and is fixedly fastened on the outside of described atmospheric side insulator by the described cardinal extremity of described housing.Described tilting gearing can comprise that one is radially given prominence to; it radially extends from described atmospheric side insulator in a zone of described atmosphere side cover inside; described radially outstanding the maintenance, engage with guard circle cylinder next-door neighbour in described, to have a down dip at given angle of inclination.
By above-described structure; described tilting gearing be included in the described atmosphere side cover from described atmospheric side insulator radially extend described radially outstanding; with the described interior guard circle cylinder that is arranged on described atmosphere side cover inside, described radially outstanding the maintenance with guard circle cylinder next-door neighbour joint in described.Therefore, keep body even described sensing element favours described sensing element, the described atmospheric side insulator given angle that can tilt keeps the co-axially align between described sensing element and the described atmospheric side insulator simultaneously.Therefore, the described spring terminal of described atmospheric side insulator and the situation of the described electrode terminal disengaging of described sensing element can not take place, thereby guarantee conductivity between described spring terminal and the described electrode terminal in the mode of high reliability.
For the described gas sensor according to present embodiment, described leaning device can comprise a described projection of radially giving prominence to that is formed at described atmospheric side insulator.
By this structure, the formation of described projection on described atmospheric side insulator described radially outstanding does not cause the increase of described gas sensor element, and this can make designs simplification when keeping lightweight, obtain low cost simultaneously.
For the described gas sensor according to present embodiment, described leaning device can comprise a projection that is formed on the described interior guard circle cylinder, and its described radially outstanding next-door neighbour with described atmospheric side insulator engages.
By this structure, the formation on the guard circle cylinder in described of described projection does not cause the increase of described gas sensor element, and this can make designs simplification when keeping lightweight, obtain low cost simultaneously.
Described gas sensor for present embodiment, described tilting gearing can comprise a projection that is formed on one of described atmospheric side insulator and described element maintenance body, has the relation that is expressed as H/W＞0.1, wherein H represents that described projection keeps the outstanding length of one of body from described atmospheric side insulator and described element, W represents that described atmospheric side insulator and described element keep the width smaller of one of body, and its width keeps another width of body littler than described atmospheric side insulator and described element.
Suppose to be formed at described atmospheric side insulator and described element and keep the described projection on one of body to have the relation that is expressed as H/W＞0.1, described atmospheric side insulator is had a down dip in given angle keep body in described element.Therefore, one of the described spring terminal of described atmospheric side insulator can not break away from the described electrode terminal of described sensing element, thereby guarantees conductivity between described spring terminal and the described electrode terminal in the mode of high reliability.
Described gas sensor for present embodiment, described housing can comprise that one keeps body spare, first a cylindrical extension portion and one second cylindrical extension portion, the described first cylindrical extension portion keeps described insulating part towards described atmospheric side insulator extension and in inside in one direction, and the described second cylindrical extension portion extends from described maintenance body spare on the direction opposite with the described first cylindrical extension portion.The described first cylindrical extension portion has the radially inside part in the face of described atmospheric side insulator, and described oblique tube comprises a projection, its keep with the described first cylindrical extension portion described radially inwardly the part next-door neighbour engage.
Comprise with the described first cylindrical extension portion described radially inwardly part keep the described oblique tube of the described projection that the next-door neighbour engages make described atmospheric side insulator can by utilize the described first cylindrical extension portion described radially inwardly part favour described element and keep body.Therefore, break away from, thereby guarantee conductivity between described spring terminal and the described electrode terminal in the mode of high reliability by the described spring terminal neither one of described atmospheric side insulator carrying described electrode terminal together with described sensing element.And this structure does not cause the increase of described gas sensor element, and this can make designs simplification when keeping lightweight, obtain low cost simultaneously.
Described gas sensor for present embodiment, described insulating part can comprise a component side insulator, it comprises a cylindrical body, the cardinal extremity of described cylindrical body keeps the described housing of body to extend from described element, and wherein, described tilting gearing can comprise a projection that engages with described atmospheric side insulator next-door neighbour.
Description of drawings
Fig. 1 is the longitudinal sectional view according to the gas sensor of the first embodiment of the present invention.
Fig. 2 is the partial sectional view along the gas sensor of first embodiment shown in the line A-A of Fig. 1.
Fig. 3 is a synoptic diagram, shows the placement situation of the sensing element of formation gas sensor shown in Figure 1 with respect to the atmospheric side insulator.
Fig. 4 is the planimetric map relevant with side view of far-end that forms the atmospheric side insulator of gas sensor shown in Figure 1.
Fig. 5 A is a synoptic diagram to 5E, shows the multiple profile of the projection on the far-end of the atmospheric side insulator that is formed at gas sensor shown in Figure 1.
Fig. 6 is a synoptic diagram, shows the atmospheric side insulator, and it has a sensing element, and by the spring terminal bias voltage, projection is formed on the atmospheric side insulator of gas sensor shown in Figure 1 sensing element on the direction of the axis that is parallel to projection.
Fig. 7 is the longitudinal sectional view of gas sensor according to a second embodiment of the present invention.
Fig. 8 is the sectional elevation along the line B-B of Fig. 7.
Fig. 9 is the longitudinal sectional view of the gas sensor of a third embodiment in accordance with the invention.
Figure 10 is the sectional elevation along the line C-C of Fig. 9.
Figure 11 is the sectional elevation along the line D-D of Fig. 9.
Figure 12 is the longitudinal sectional view of the gas sensor of Fig. 9 version of arriving the 3rd embodiment shown in Figure 11.
Figure 13 A is a synoptic diagram, shows the gas sensor of a fourth embodiment in accordance with the invention, and shows the placement situation between sensing element and atmospheric side insulator, and wherein element keeps body to have the width bigger than atmospheric side insulator.
Figure 13 B is a synoptic diagram, shows the gas sensor of a fourth embodiment in accordance with the invention, and shows another placement situation between sensing element and atmospheric side insulator, and wherein element keeps body to have the width littler than atmospheric side insulator.
Figure 14 is the longitudinal sectional view of the gas sensor of prior art.
Figure 15 is a synoptic diagram, and what show prior art is obliquely installed gas sensor under the situation at sensing element.
Figure 16 is a synoptic diagram, shows the gas sensor of prior art, wherein keeps minimum clearance between sensing element and the atmospheric side insulator.
Figure 17 is a synoptic diagram, shows the gas sensor of prior art, and wherein the atmospheric side insulator is with respect to the sensing element setting.
Embodiment
Now, with the gas sensor that is described in detail with reference to the attached drawings according to a plurality of embodiment of the present invention.Yet, these embodiment that the present invention is not limited to describe below, and technological concept of the present invention can realize in conjunction with other known technologies or in conjunction with the other technologies with the function that is equivalent to this known technology.
In description subsequently, identical label is represented identical or corresponding parts in these accompanying drawings.
(first embodiment)
To with reference to the accompanying drawings according to the gas sensor of the first embodiment of the present invention, 1-6 describes in detail.
As illustrated in fig. 1 and 2, gas sensor 1 of the present invention comprises the sensing element 2 that an xsect is a rectangle, it has a test section 2a and a cardinal extremity part 2b of the concentration that is used for detecting gas to be measured (after this being called measurement gas) specific gas, be used to insert and keep an element maintenance body 3 of sensing element 2, and an atmospheric side insulator 4, it is arranged on certain position covers sensing element 2 with the zone at the cardinal extremity that keeps body 3 near element base portion.
Element keeps body 3 to comprise a housing 31, and it is formed with threaded portion 31a, and the flow passage area that this threaded portion can be screwed into measurement gas detects measurement gas to allow sensing element 2; And an insulating part, just be fixedly mounted in a component side insulator 32 of housing 31 inboards.The sensing element 2 that remains on housing 31 inboards is inserted through component side insulator 32 and is retained in wherein.
Shown in Fig. 3 the best, sensing element 2 has cardinal extremity part 2b, just goes up distal portions for one, and it is formed with the pair of electrodes terminal 21,21 that forms at the interval location place that gives set a distance.
As Fig. 2 and shown in Figure 4, the cross section is that tetragonal atmospheric side insulator 4 has a pair of rectangular aperture 4a, 4a, and 4b, 4b, 4c, 4c are given prominence in the location that extends internally.Outstanding 4b, 4b are arranged between rectangular aperture 4a, the 4a with the apparent surface with sensing element 2 with becoming face-to-face relation in the location.Be respectively formed at outstanding 4c, the 4c center on its vertical side, location among rectangular aperture 4a, the 4a.Wherein a pair of two spring terminals 41,41 are with given being disposed among the rectangular aperture 4a, and are positioned at the fixed position by locating outstanding 4c.Equally, two spring terminals 41,41 of another centering are disposed among the rectangular aperture 4b with given, and are positioned at the fixed position by locating outstanding 4c.And as shown in Figure 3, atmospheric side insulator 4 is arranged on the cardinal extremity 3a of element maintenance body 3, can mate with axial direction to allow sensing element 2.
Shown in Fig. 3 and Fig. 4 the best, gas sensor 1 further comprises tilting gearing 100 as described later.Atmospheric side insulator 4 has a far-end 401 that is formed with a pair of outward extending projection 11, plays the effect of tilting gearing 100, and projection is arranged on and locatees on the Centered axis of outstanding 4c, 4c.Each projection 11 has a circular surface 11a.Therefore, the projection 11 of atmospheric side insulator 4 keeps keeping with element the cardinal extremity 3a contiguous engagement of body 3, makes to make atmospheric side insulator 4 keep the cardinal extremity 3a swing of body 3 with respect to element.
As shown in Figure 6, the axis that aligns with it of projection 11 is gone up parallel in spring terminal 41,41 biased each direction (arrow " f " expression).
More specifically, projection 11 is formed on the far-end 40a of atmospheric side insulator 4 in two positions along a straight line, and the phase surface formed thereon with electrode terminal 21,21 intersects, and this straight line crosses the central axis of sensing element 2.And Fig. 6 is an exemplary view, and wherein spring terminal 41,41 has at the biasing force with arrow " f " expression shown in the position of spring terminal 41,41.
For present embodiment, the semicircle that projection 11 forms shown in Fig. 3 and Fig. 5 A.In a selection, projection also can be the leg-of-mutton projection 11-1 of the cardinal principle shown in Fig. 5 B.In another was selected, projection also can be the trapezoidal projection 11-2 of the cardinal principle shown in Fig. 5 C.In another is selected, projection can also be the cardinal principle triangular-shaped profile 11-3 on the whole zone of the far-end that is formed at atmospheric side insulator 4 shown in Fig. 5 D, or the circular 11-4 of the cardinal principle on the whole zone of the far-end that is formed at atmospheric side insulator 4 shown in Fig. 5 E.
And projection is from far-end 40 outstanding 0.3 to the 3.0mm altitude ranges of atmospheric side insulator 4.
The sensing element 2 that the stack element that is formed by the laminated ceramic plate constitutes is taked unified structure, comprise sensing unit that is used for detectable concentration (such as the concentration of the oxygen in the waste gas of internal combustion engine or the concentration of nitrogen oxide) and the well heater that is used to regulate the sensing unit temperature, they all do not illustrate, and wherein each laminated ceramic plate is all by aluminium oxide (AL
2O
3) or zirconium (ZrO
2) make.
Two electrode terminals 21 are formed on a side of sensing element 2, and its opposite side is formed with two other electrode terminal 21, and sensing element carries all four terminal electrodes 21 thereon.In these electrodes, two electrode terminals 21 are electrically connected with sensing unit, and two other electrode is electrically connected on well heater.
Look back at Fig. 1 and Fig. 2, component side insulator 32 comprises a cylindrical body 32a who is formed with cylindrical cavity 32b, and is formed with a cylindrical protrusion 32c who extends axially endoporus 32d.Housing 31 comprises that keeps a body spare 31b, one second 31e of cylindrical extension portion that it has one first 31c of cylindrical extension portion that is formed with the first endoporus 31d and is formed with the second endoporus 31f, and the diameter of second endoporus is less than the diameter of the first endoporus 31d.Housing 31 has an annular shoulder 31g who is formed between the first and second endoporus 31d, the 31f.
By this structure, sensing element 2 inserts by the endoporus 32d that extends axially of component side insulator 32, and inner chamber 32b is filled with glass-sealing agent 33, and sensing element 2 is sealed in the fixed position by glass-sealing agent.And, component side insulator 32 is accommodated in the housing 31, the column of winning is arranged among the first cylinder endoporus 31d of the first cylindrical extension portion 31, and the second endoporus 31f that cylindrical protrusion 32c passes the second cylindrical extension portion of housing 31 extends, and wherein the diapire of cylindrical body 32a is placed on the annular shoulder 31g of the maintenance body spare 31b that forms housing 31.First 31c of cylindrical extension portion of housing 31 has a far-end, and this far-end has to extend on inward direction radially and divides 31h with an embedding real part that component side insulator 32 is remained on the fixed position.The embedding real part that annular disc spring 35 inserts housings 31 divides between cylindrical body 32a extreme of 31h and component side insulator 32 and firmly fixes.
Further, as Fig. 2 and shown in Figure 4, four spring terminals 41,41 that are arranged in the atmospheric side insulator 4 keep being clipped in the middle with the cardinal extremity part 2b with sensing element 2 with relevant electrode terminal 21 pressure contact.In addition, spring terminal 41,41 is electrically connected with lead 42 respectively.
And, as depicted in figs. 1 and 2, first 31c of cylindrical extension portion, just the base portion of housing 31 carries and supports regularly an atmosphere side cover 36 thereon, a buttonhole 36a is assemblied in the lid with support wire 42,42, so that sealing atmospheric side insulator 4 and sensing element 2.And, second 31e of cylindrical extension portion, just the far-end of housing 31 carries an over cap 37 thereon, is used to protect the test section 20a of sensing element 2 to avoid damaging.
Now, the operation of the gas sensor 1 of present embodiment will be described below.
For gas sensor 1, atmospheric side insulator 4 is installed to that element keeps on the cardinal extremity of body 3 and is thereon fastening.Just, as shown in Figure 3, it is basis instrument that atmospheric side insulator 4 does not keep body 3 with element, but is basis instrument with sensing element 2.By this layout, even sensing element 2 keeps body 3 to tilt with respect to element, atmospheric side insulator 4 is also with sensing element 2 same straight lines.Therefore, spring terminal 41,41 can guarantee to keep electrically contacting with electrode terminal 21, and does not cause any unjustified between the electrode terminal 21 of spring terminal 41,41 and sensing element 2.
And owing to be formed with projection 11 on the far-end 401 of atmospheric side insulator 4, atmospheric side insulator 4 keeps body 3 to keep the next-door neighbour to engage by projection 11 and element.Therefore, atmospheric side insulator 4 keeps on the body 3 at element with firm support structure by projection 11.In addition, because atmospheric side insulator 4 keeps body 3 to keep the next-door neighbour to engage by projection 11 and element, atmospheric side insulator 4 can be placed on element with free variable-angle and keep on the body 3.This causes atmospheric side insulator 4 therefore can to tilt according to the angle of inclination of sensing element 2.
And, because projection 11 is formed on the far-end 401 of atmospheric side insulator 4 along the linear of the bias voltage direction that is parallel to spring terminal 41,41, atmospheric side insulator 4 can tilt in the direction that intersects with the bias voltage direction of spring terminal 41,41, and is just consistent with the angle of inclination of the electrode terminal 21 of sensing element 2.This causes can guaranteeing enough conductivity between spring terminal 41,41 and the electrode terminal 21.
As set forth above, pass through present embodiment, a kind of gas sensor can be provided, and its structure can guarantee enough conductivity between the electrode terminal of sensing element and the associated spring terminal, makes the atmospheric side insulator to be arranged on element with stable manner simultaneously and keeps on the body.
(second embodiment)
Next, gas sensor 1A according to a second embodiment of the present invention will describe with reference to figure 7 and Fig. 8.Except some features, the similar of the gas sensor of the gas sensor of second embodiment and first embodiment, unnecessary description will be omitted and emphasis is described these distinguishing characteristicss.
Fig. 7 is the cut-open view of the gas sensor 1A of second embodiment, and Fig. 8 is the cut-open view of gas sensor 1A, and second embodiment has represented a kind of structure, and wherein projection 11A is formed on the cardinal extremity that element keeps body 3A.
For the gas sensor 1A of second embodiment, form element and keep an element retainer insulator 32A of body 3 to have a cylindrical body 32a, its cardinal extremity is projected into beyond the cardinal extremity, and the embedding real part that just is projected into housing 31A divides beyond the 31h.And cylindrical body 32a has a major diameter part 321 that forms between the first and second column part 32a and 32c, and it is contained in the element that forms housing 3A and keeps among the endoporus 31j of body 3A.What limit between the periphery of the endoporus 31k of housing 31A and the first cylindrical body 32a is an annular space, sealant 331, insulating part 332 and becket 333 are stacked in order, the cardinal extremity of housing 31A is divided 31h to form the embedding real part in fact by embedding, so that these componentries are remained on the fixed position.This allows the gap between component side insulator 32A and housing 31A to be tightly sealed, and makes these elements fix secured to one anotherly.
By the structure that proposes above, projection 11A is formed on the upper end wall of cylindrical body 32a, and cylindrical body 32a forms component side insulator 32A, and component side insulator 32A forms element and keeps body 3A.Atmospheric side insulator 4 has far-end 401, and it keeps engaging with projection 11A next-door neighbour.
By the gas sensor 1A of present embodiment, projection 11A can be formed in simple and reliable mode on the far-end of cylindrical body 32a of component side insulator 32A.And atmospheric side insulator 4 can be supported on element and keep on the body 3A, to have tilt capability with stationary mode.In addition, the mode of operation of the gas sensor 1A of second embodiment is identical with the mode of operation of the gas sensor 1 of first embodiment.
(the 3rd embodiment)
Then, the gas sensor 1B of a third embodiment in accordance with the invention will describe with reference to figure 9 to Figure 11.Except some features, the similar of the gas sensor 1B of the 3rd embodiment and the gas sensor 1 of first embodiment, unnecessary description will be omitted and emphasis is described these distinguishing characteristicss.
Fig. 9 is the cut-open view of the gas sensor 1B of the 3rd embodiment, and Figure 10 is the cut-open view along the line C-C of Fig. 9 of gas sensor 1B, and the 3rd embodiment has represented a kind of structure of atmospheric side insulator 4B and sensing element 2.Figure 11 is the cut-open view along the line D-D of Figure 10 of gas sensor 1B.
For the 3rd embodiment; gas sensor 1B comprises an internal protection cylinder 361; be arranged on the cardinal extremity of atmosphere side cover 36 coaxially and supported by the cardinal extremity of housing 31B, it has cardinal extremity being supported regularly by the periphery of first 31c of cylindrical extension portion and atmospheric side insulator 4B and supports thereon another cardinal extremity part 362.
Shown in Figure 10 and Figure 11 the best, atmospheric side insulator 4B comprises a rectangular base 43, be arranged in the atmosphere side cover 36, and two ends all be formed with radially outstanding 43a, 43a and from base portion 43 extend downwards an acceptance division 43b.Radially outstanding 43a, the 43a of base portion 43 have diapire, and it is formed with projection 11B, the 11B that faces downwards, and projection keeps engaging with cardinal extremity part 362 next-door neighbours of interior protection cylinder 361.
By present embodiment, gas sensor 1B can guarantee the conductivity between the electrode terminal 21 of spring terminal 41 and sensing element 2 in highly reliable mode.In addition, atmospheric side insulator 4B can be supported on the element retainer 30 with stationary mode.And the gas sensor 1B of present embodiment is identical with the mode of operation of the gas sensor 1 of first embodiment.
And; the gas sensor 1B of the 3rd embodiment can be modified; make substitute on radially extension 43a, the 43a of atmospheric side insulator 4B, provide projection be; the cardinal extremity part 362 of interior protection cylinder 361 is formed with projection 11C; the diapire that radially extends 43a, 43a is disposed thereon, as shown in figure 12.
(the 4th embodiment)
Then, the gas sensor 1C of a fourth embodiment in accordance with the invention will describe with reference to figure 13A and Figure 13 B.Except some features, the similar of the gas sensor 1C of the 4th embodiment and the gas sensor 1 of first embodiment, unnecessary description will be omitted and emphasis is described these distinguishing characteristicss.
Figure 13 A is the cut-open view of an amplification, shows the major part of the gas sensor 1C of the 4th embodiment, and Figure 13 B is the cut-open view of the gas sensor 1C of the 4th embodiment.
For the 4th embodiment, gas sensor 1C has the particular kind of relationship between the outstanding length H of the width W of the cardinal extremity 301 of the width W 1 of the far-end 401 of atmospheric side insulator 4C, element maintenance body 3 and projection 11.
For present embodiment, projection 11 is formed on the far-end of atmospheric side insulator 4C, has from the outstanding length H of the far-end 401 of atmospheric side insulator 4C.
For the gas sensor 1C shown in Figure 13 A, element keep the width W of the cardinal extremity 301 of body 3 be set on the direction that the bias voltage direction with spring terminal 41 (see figure 6)s intersects greater than the width W of the far-end 401 of atmospheric side insulator 4.In this case, suppose that the width on the direction that intersects with the bias voltage direction of spring terminal 41 of the far-end 401 of atmospheric side insulator 4 is set as W, the pass of foundation is H/W＞0.1.
And for the gas sensor 1C shown in Figure 13 B, the width of the far-end 401 of atmospheric side insulator 4C keeps the width W 2 of the cardinal extremity 301 of body 3 greater than element.In this case, suppose that element keeps the width on the direction that the bias voltage direction with spring terminal 41 of the cardinal extremity 301 of body 3 intersects to be set as W, the pass of foundation is H/W＞0.1.
By this structure above-mentioned, might prevent that sensing element 2 is destroyed.That is to say that sensing element 2 might keep body 3 to have pitch angle near 1 ° with respect to element.For this possibility, if the pass of setting up is H/W＞0.1, so, atmospheric side insulator 4 and element keep body 3 can prevent to come in contact each other in other positions except projection 11.That is to say that atmospheric side insulator 4 and element keep the body 3 can be by projection 11 joint that is closely adjacent to each other.This causes therefore can preventing that atmospheric side insulator 4 from keeping body 3 floating from element.This has suppressed impact or load affacts on the sensing element 2 from atmospheric side insulator 4, and this has prevented damage sensing element 1.
And the gas sensor 1C of present embodiment is identical with the operation of the gas sensor 1 of first embodiment.
And the structure that is formed with projection 11 on the base portion 301 of element maintenance body 3 has identical effect with those structures that propose above.
And in actual practice, under expection sensing element 2 tilted near 5 ° situation with respect to element maintenance body 3, the width of atmospheric side insulator 4 and element kept the width of the cardinal extremity of body preferably can have the relation that is expressed as H/W＞0.2.
Although specific embodiments of the invention are described in detail, it should be appreciated by those skilled in the art that under the enlightenment of disclosed whole technology, those details can be made numerous modifications and variations.Therefore, disclosed special structure only is an illustrative, is not to be intended to limit the scope of the invention, and scope of the present invention is given in the four corner of the claim of back and all equivalents thereof.
Claims (9)
1. gas sensor, it comprises:
Element keeps body, and it comprises the housing on the gas channel that can be installed in gas to be measured and is fixedly fastened on insulating part on the described housing;
Sensing element, it is fixedly fastened on the described insulating part, and described sensing element has a cardinal extremity, and the apparent surface of described cardinal extremity is formed with a plurality of electrode terminals respectively;
The atmospheric side insulator, it has covered the described cardinal extremity of described sensing element, and a plurality of spring terminals that keep in touch with described electrode terminal respectively of inner combination; And
Tilting gearing, it is arranged on described atmospheric side insulator and described element and keeps between the body, in order to allow described atmospheric side insulator on a plane on the surface that is parallel to described sensing element with given inclined at inclination angles.
2. gas sensor according to claim 1 is characterized in that:
Described tilting gearing comprises along an axis parallel with the bias voltage direction of each described spring terminal and is formed at projection on the far-end of described atmospheric side insulator.
3. gas sensor according to claim 1 is characterized in that:
Described tilting gearing comprises that being formed at described element along an axis parallel with the bias voltage direction of each described spring terminal keeps projection on the cardinal extremity of body.
4. gas sensor according to claim 1 is characterized in that:
Described element keeps body to comprise the atmosphere side cover, described atmosphere side cover is fixedly secured a cardinal extremity at described housing, to cover described atmospheric side insulator, with an interior guard circle cylinder, the zone that it is arranged on described atmosphere side cover inside and is fixedly fastened on the outside of described atmospheric side insulator by the described cardinal extremity of described housing; And
Described tilting gearing comprises radially outstanding; described radially giving prominence in a zone of described atmosphere side cover inside radially extended from described atmospheric side insulator; described radially outstanding the maintenance, engage with guard circle cylinder next-door neighbour in described, with can be with given inclined at inclination angles.
5. gas sensor according to claim 4 is characterized in that:
Described leaning device comprises the described projection of radially giving prominence to that is formed at described atmospheric side insulator.
6. gas sensor according to claim 4 is characterized in that:
Described leaning device comprises the projection that is formed on the described interior guard circle cylinder, and described projection engages with the described radially outstanding next-door neighbour of described atmospheric side insulator.
7. gas sensor according to claim 1 is characterized in that:
Described tilting gearing comprises the projection that is formed on one of described atmospheric side insulator and described element maintenance body; And
Described atmospheric side insulator and described element keep body to have the relation that is expressed as H/W＞0.1,
Wherein, H represents that described projection keeps the outstanding length of one of body from described atmospheric side insulator and described element, W represents that described atmospheric side insulator and described element keep the width smaller of one of body, and its width keeps another width of body littler than described atmospheric side insulator and described element.
8. gas sensor according to claim 1 is characterized in that:
Described housing comprises body spare, the first cylindrical extension portion and the second cylindrical extension portion of keeping, the described first cylindrical extension portion is extending on the direction of described atmospheric side insulator and is keeping described insulating part in inside, and the described second cylindrical extension portion extends from described maintenance body spare on the direction opposite with the described first cylindrical extension portion;
Wherein, the described first cylindrical extension portion has the radially inside part in the face of described atmospheric side insulator; And
Wherein, described oblique tube comprises projection, and described projection keeps engaging with described radially inwardly partly next-door neighbour of the described first cylindrical extension portion.
9. gas sensor according to claim 1 is characterized in that:
Described insulating part comprises the component side insulator, and described component side insulator comprises cylindrical body, and the cardinal extremity of described cylindrical body keeps the described housing of body to extend from described element; And
Wherein, described tilting gearing comprises the projection that engages with described atmospheric side insulator next-door neighbour.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005326464 | 2005-11-10 | ||
| JP326464/2005 | 2005-11-10 | ||
| JP192590/2006 | 2006-07-13 |
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| CN1963486A true CN1963486A (en) | 2007-05-16 |
| CN100549688C CN100549688C (en) | 2009-10-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102422152A (en) * | 2010-03-31 | 2012-04-18 | 日本碍子株式会社 | Contact member for gas sensor, gas sensor, restraining member, method of connecting sensor elements of gas sensor to contact member and method of manufacturing gas sensor |
| CN102576002A (en) * | 2009-10-13 | 2012-07-11 | 日本碍子株式会社 | Contact member for a gas sensor, gas sensor, restraint member, method for connecting a contact member with a sensor element in a gas sensor, and method for manufacturing a gas sensor |
| CN104797931A (en) * | 2012-11-20 | 2015-07-22 | 株式会社电装 | Gas sensor |
| CN105264364A (en) * | 2013-03-14 | 2016-01-20 | 斯科特科技公司 | Sensor assembly |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2500721B1 (en) * | 2009-11-09 | 2020-06-17 | NGK Insulators, Ltd. | Gas sensor, contact member of gas sensor, and sensor element holding member for contact member of gas sensor |
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2006
- 2006-11-08 CN CNB2006101445296A patent/CN100549688C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102576002A (en) * | 2009-10-13 | 2012-07-11 | 日本碍子株式会社 | Contact member for a gas sensor, gas sensor, restraint member, method for connecting a contact member with a sensor element in a gas sensor, and method for manufacturing a gas sensor |
| CN102576002B (en) * | 2009-10-13 | 2014-07-09 | 日本碍子株式会社 | Contact member for a gas sensor, gas sensor, restraint member, method for connecting a contact member with a sensor element in a gas sensor, and method for manufacturing a gas sensor |
| CN102422152A (en) * | 2010-03-31 | 2012-04-18 | 日本碍子株式会社 | Contact member for gas sensor, gas sensor, restraining member, method of connecting sensor elements of gas sensor to contact member and method of manufacturing gas sensor |
| CN102422152B (en) * | 2010-03-31 | 2014-08-13 | 日本碍子株式会社 | Contact member for gas sensor, gas sensor, restraining member, method of connecting sensor elements of gas sensor to contact member and method of manufacturing gas sensor |
| CN104797931A (en) * | 2012-11-20 | 2015-07-22 | 株式会社电装 | Gas sensor |
| CN105264364A (en) * | 2013-03-14 | 2016-01-20 | 斯科特科技公司 | Sensor assembly |
| US10024698B2 (en) | 2013-03-14 | 2018-07-17 | Scott Technologies, Inc. | Connector mechanism for a sensor |
| CN105264364B (en) * | 2013-03-14 | 2019-06-28 | 德康公司 | Sensor module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100549688C (en) | 2009-10-14 |
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