CN104583766A - Gas sensor and gas sensor unit - Google Patents
Gas sensor and gas sensor unit Download PDFInfo
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- CN104583766A CN104583766A CN201380043797.7A CN201380043797A CN104583766A CN 104583766 A CN104583766 A CN 104583766A CN 201380043797 A CN201380043797 A CN 201380043797A CN 104583766 A CN104583766 A CN 104583766A
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- enclosure body
- gas sensor
- glaze layer
- base metal
- rear end
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4077—Means for protecting the electrolyte or the electrodes
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- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Provided are a gas sensor and a gas sensor unit that are able, even if a ceramic enclosure provided with a glaze layer on the outer surface thereof is secured to a main fitting, to resist cracking and breakage of the glaze layer. The gas sensor is provided with a gas detection element, a main fitting, and a ceramic enclosure. The ceramic enclosure has an enclosure trunk section provided with an enclosure-exposing section and an enclosure-covering section. The enclosure trunk section has on the outer surface thereof a glaze layer. The glaze layer on the enclosure-covering section has a recessed section that is recessed further inward in the radial direction than the glaze layer on the enclosure-exposing section. Metal packing is in contact with at least portions of the glaze layer other than the recessed section.
Description
Mutually quoting related application
This international application advocates the right of priority based on the 2012-181169 Japanese patent application of filing an application to Japan Office on August 17th, 2012, and is quoted by the full content of this 2012-181169 Japanese patent application in border application home.
Technical field
The present invention relates to the gas sensor and gas sensor unit with the gas detecting element formed primarily of pottery.
Background technology
In the past, propose various scheme about the gas sensor with the gas detecting element be made up of pottery etc.About these gas sensors, can enumerate be installed in internal combustion engine gas outlet on and the gas sensor of oxygen concentration detected in exhaust.
Such as, Patent Document 1 discloses such gas sensor following, by the rear end side of ceramic enclosure body blanketing gas detecting element, and cover the ceramic enclosure body of the outside of gas outlet with metal cylindrical shell.
In addition, Patent Document 2 discloses such gas sensor following, metal cylindrical shell is split, gap is set between, dispelled the heat by the ceramic enclosure body exposed from the gap portion of metal cylindrical shell, improve thermal diffusivity thus.
In addition, such gas sensor is Patent Document 3 discloses following, by at the exposed portion of ceramic enclosure body formation glaze layer, even in vehicle travels during ceramic enclosure body immersion, also can suppress to produce be full of cracks and breakage due to its thermal shock at ceramic enclosure body.
[prior art document]
[patent documentation]
[patent documentation 1] Japanese Unexamined Patent Publication 2001-50928 publication
[patent documentation 2] Japanese Patent Publication 6-60883 publication
[patent documentation 3] Japanese Unexamined Patent Publication 2005-201888 publication
Summary of the invention
The problem that invention will solve
But, even as mentioned above when ceramic enclosure body arranges glaze layer, also there is problem as described below, need further to improve.
Specifically, as Fig. 9 example, pottery enclosure body P1 is the shape being provided with flange shape large-diameter portion P3 in the front of the minor diameter part P2 of tubular, the i.e. shape (having concave part P4) of the outer surface depressions of the boundary member of minor diameter part P2 and large-diameter portion P3, thus when form glaze layer P5 on ceramic enclosure body P1, such as when using spraying or cylinder coating glaze material, glaze material is trapped in concave part P4 by surface tension, consequently form the thicker glaze layer P5 of thickness at concave part P4.
And the ceramic enclosure body P1 with this glaze layer P5, by the metal pad P 6 configured at the outside surface of concave part P4 and large-diameter portion P3, is fixed by base metal part P7.
Therefore, the part that metal pad P 6 is thicker with the thickness of glaze layer P5 abuts, and thus when the pressing force based on this compression is applied to glaze layer P5, sometimes crack and breakage, according to circumstances this crackle etc. will spread to ceramic enclosure body.
Particularly, when compressing, in pad P 6, by the inside, (i.e. ceramic enclosure body P1 side) pushing is mobile, if there is thicker glaze layer P5 on ceramic enclosure body P1, glaze layer P5 sometimes bears incessantly loading and ftractures.
Consequently, the output that there is gas sensor produces abnormal, the possibility of gas sensor failure.
Expect according to an aspect of the present invention to provide gas sensor and gas sensor unit, even when ceramic enclosure body outside surface with glaze layer is fixed on base metal part, glaze layer also can be suppressed to crack and breakage.
For solving the technical scheme of problem
The present invention of (1) mode is the gas sensor with gas detecting element, base metal part and ceramic enclosure body.
Gas detecting element is to axial extension, and its front is exposed in measured gas.Base metal part surrounds around described gas detecting element.Pottery enclosure body is formed by insulating ceramics and for tubular, and under the rear end side of self state more outstanding than the rear end of base metal part, to be fixed by this base metal part by metal liner around the rear end side of surrounding described gas detecting element.
Described ceramic enclosure body has enclosure body main part, and this enclosure body main part comprises enclosure body exposed division and enclosure body covering part.Enclosure body exposed division is exposed to outside in side more rearward in the rear end than described base metal part.Enclosure body covering part is being covered by this base metal part than more forward side, the rear end of described base metal part.
The outside surface of described enclosure body main part self has glaze layer.Described glaze layer in described enclosure body covering part has the recess that the described glaze layer compared on described enclosure body exposed division caves in radially inner side.Described metal liner is at least connected to the position beyond the described recess in described glaze layer.
In the invention of the manner, the outside surface of enclosure body main part self has glaze layer, and the glaze layer in enclosure body covering part has the recess that the glaze layer compared on enclosure body exposed division caves in radially inner side.
That is, in the invention of the manner, glaze layer is thinning to radially inner side depression in enclosure body covering part, and glaze can not be detained as before and make glaze layer thickening, and thus metal liner is difficult to the glaze layer that touches in enclosure body covering part.
Namely be configured to, when metal liner abuts to glaze layer, can not abut in the recess of glaze layer, but position beyond recess (around recess etc.) abut.
Therefore, when the ceramic enclosure body with glaze layer is fixed by base metal part by metal liner, even when being applied in pressing force (the comparing radial outside towards inner side) based on compressing, particularly power directly can not be applied to the recess of the glaze layer in enclosure body covering part.
In addition, in the invention of the manner, glaze layer in enclosure body covering part is formed as than the described glaze layer thin (depression) on described enclosure body exposed division, thus when when compressing, hypothesis metal liner is pushed mobile and location contacts beyond glaze layer center dant in enclosure body covering part to the inside, the loading being applied to glaze layer is also little, and thus glaze layer is not easy to crack.
Therefore, glaze layer not easily cracks and breakage, thus also can suppress the damage of ceramic enclosure body self.Consequently, the output of gas sensor etc. can be reduced and produce abnormal, the risk of gas sensor failure.
In addition, in the invention of the manner, by arranging recess, not needing to make glaze layer integral thinned, the glaze layer on enclosure body exposed division thus can be made thicker.Therefore, when enclosure body exposed division (specifically the glaze layer on its surface) soaks, the breakage of the ceramic enclosure body caused because of its thermal shock can also effectively be suppressed.
(2) the present invention of another mode, the surface configuration of described recess has the radius-of-curvature of below 1.0mm.
The invention of the manner defines the preferred shape of recess.If the radius-of-curvature of this scope, then effectively can suppress the generation of the crackle of glaze layer etc.
(3) the present invention of another mode again, the thickness of the described glaze layer on described recess is in the scope of 1 ~ 10 μm.
The invention of the manner illustrates the preferred thickness of recess.If the glazed thickness of this scope, then effectively can suppress the generation of the crackle of glaze layer etc. etc.
In addition, the thickness of this glaze layer does not refer to average thickness, and refers to: comprise maximum and minimum thickness, be controlled in this scope.
At this, the thickness of recess represents the thickness of ceramic enclosure body relative to the radial direction on the cross section of axially vertically cutting formation.
(4) the present invention of another mode again, the thickness of the described glaze layer on described enclosure body exposed division is in the scope of 15 ~ 100 μm.
The invention of the manner illustrates the preferred thickness of the glaze layer on enclosure body exposed division.If the glazed thickness of this scope, then can alleviate the thermal shock formed because of immersion, effectively suppress the generation of the crackle of ceramic enclosure body etc.
In addition, the thickness of this glaze layer does not refer to average thickness, and refers to: comprise maximum and minimum thickness, be controlled in this scope.
(5) the present invention of another mode is the gas sensor unit with gas sensor and gas sensor lid again.
Gas sensor has gas detecting element, base metal part, ceramic enclosure body and terminal component.Gas detecting element is to axial extension, and its front is exposed in measured gas.Base metal part surrounds around described gas detecting element.Pottery enclosure body is formed by insulating ceramics and for tubular, and under the rear end side of self state more outstanding than the rear end of base metal part, to be fixed by this base metal part by metal liner around the rear end side of surrounding described gas detecting element.Terminal component is connected with the medial electrode formed on the inner peripheral surface of described gas detecting element and the output signal from described gas detecting element is outputted to outside; And
The lid terminal that gas sensor lid has tubular and the insulation division formed by the elastic body of insulativity.Lid terminal is connected with the described terminal component of described gas sensor, and described output signal is sent to external device (ED).Insulation division covers the rear end side of lid terminal and described ceramic enclosure body.
The gas sensor of this gas sensor unit adopts the gas sensor described in any one aspect above-mentioned.
The gas sensor unit of this aspect above-mentioned in any one described in gas sensor installing gas sender unit cap.
This gas sensor unit is when being installed in gas outlet etc. and using, between gas sensor and gas sensor lid, the enclosure body exposed division (specifically the glaze layer on its surface) of pottery enclosure body is exposed to outside, and thus thermal diffusivity is good.Further, owing to being formed with glaze layer on the surface of ceramic enclosure body, even also there is higher resistance to sudden heating when thus soaking.In addition, gas sensor adopts the gas sensor described in any one aspect above-mentioned, and thus glaze layer and ceramic enclosure body are difficult to breakage, therefore have higher permanance.
Accompanying drawing explanation
Fig. 1 represents the cut-open view by the state of the gas sensor of embodiment cutting vertically.
Fig. 2 represents the partial sectional view by the state of the glaze pottery enclosure body cutting vertically used in gas sensor.
The part B of Fig. 1 is amplified the key diagram represented by Fig. 3.
Fig. 4 A represents key diagram glaze slip being sprayed at the state on the outside surface of ceramic enclosure body in the manufacture method of glaze pottery enclosure body, Fig. 4 B represents the key diagram being formed with the state of glaze material layer in the manufacture method of glaze pottery enclosure body on the outside surface of ceramic enclosure body, and Fig. 4 C represents the key diagram air blowing of glaze material layer being removed to the state of unnecessary glaze slip in the manufacture method of glaze pottery enclosure body.
Fig. 5 represents the cut-open view by the state of axial for the gas sensor cover rim of embodiment cutting.
Fig. 6 is the key diagram of state when representing the gas sensor unit using embodiment.
Fig. 7 is the key diagram of the measuring position of the thickness of the glaze layer represented on ceramic enclosure body etc.
Fig. 8 is the curve map of the measurement result of the thickness representing the glaze layer measured vertically on ceramic enclosure body.
Fig. 9 is the key diagram representing prior art.
Label declaration
1 gas sensor;
3 gas detecting elements;
9 ceramic enclosure bodies;
10 glaze pottery enclosure bodies;
15 base metal parts;
39 large-diameter portions;
41 minor diameter parts;
47 glaze layers;
53 the 2nd liners (metal liner);
65 lid terminals;
67 enclosure body bights;
73 recesses;
91 gas sensor lids;
111 gas sensor units;
9A enclosure body exposed division (immersion portion);
9B enclosure body covering part;
The upper enclosure body covering part of 9b;
9C enclosure body main part.
Embodiment
Below, the embodiment of gas sensor of the present invention is described.
[embodiment]
A) first, the one-piece construction of the gas sensor of present embodiment is described according to Fig. 1.
In addition, using the below in Fig. 1 as gas sensor front, top is described as rear end side.
As shown in Figure 1, the gas sensor 1 of present embodiment has gas detecting element 3, lateral electrode 5, medial electrode 7, ceramic enclosure body 9, terminal component 11, shell 13.
Wherein, described shell 13 has base metal part 15 and protective cover 17.
Base metal part 15 is made up of SUS 430, and is formed as general cylindrical shape.In the inside of base metal part 15, be circumferentially provided with the inner peripheral support portion 21 of the flange part 19 for supporting gas detecting element 3.The threaded portion 25 for gas sensor 1 being installed on gas outlet 23 (with reference to Fig. 6) is formed in the outside of base metal part 15.Rear end side in this threaded portion 25 is circumferentially provided with for by the hexagonal portion 27 in screwed for threaded portion 25 gas outlet 23.
On the other hand, protective cover 17 is cylindrical shells of metal general cylindrical shape, has the air hole 29 for the exhaust in gas outlet 23 being imported gas sensor 1 inside.
Described gas detecting element 3 is made up of the solid electrolyte with oxygen-ion conductive, is fixed with the state be inserted in base metal part 15.This gas detecting element 3 have leading section 31 blocked and along axis A direction extend substantially cylindrical shape.Further, be provided with the flange part 19 protruded to radial outside in the periphery of gas detecting element 3, metal 1st liner 33 is configured between the surface of the front end face of this flange part 19 and the inner peripheral support portion 21 of base metal part 15.
In addition, about forming the solid electrolyte of gas detecting element 3, such as representationally make Y
2o
3or the ZrO of CaO solid solution
2, but also can use oxide and the ZrO of alkaline-earth metal in addition
2solid solution, or the oxide of rare earth metal and ZrO
2solid solution.In addition, also can make in this solid solution containing HfO
2.
Pt or Pt alloy is formed as Porous and forms by described lateral electrode 5, arranges in the mode of the lateral surface 35 of the leading section 31 of blanketing gas detecting element 3.In addition, this lateral electrode 5 is set to the front end face of flange part 19 always, and is electrically connected with base metal part 15 by the 1st liner 33.
On the other hand, Pt or Pt alloy is also formed as Porous and forms by described medial electrode 7, arranges in the mode of the medial surface 37 of blanketing gas detecting element 3.
Described ceramic enclosure body 9 is made up of insulating ceramics (specifically aluminium oxide), has substantially cylindrical shape.The large-diameter portion 39 that this ceramic enclosure body 9 has a tubular protruded to radial outside in front is positioned at the minor diameter part 41 of the tubular of rear end side with comparing large-diameter portion 39, be formed between large-diameter portion 39 and minor diameter part 41 towards axis A direction rear end side towards the rear end conical surface 43.
In addition, the outside surface 45 of the radial direction towards the rear end conical surface 43 and minor diameter part 41 of large-diameter portion 39 is formed glaze layer 47 (with reference to Fig. 2), and details describes later.In addition, the ceramic enclosure body 9 outside surface being formed with glaze layer 47 is called glaze pottery enclosure body 10.
The large-diameter portion 39 of this ceramic enclosure body 9, with the state around the rear end side of surrounding gas detecting element 3, is got involved between gas detecting element 3 and base metal part 15 together with the ceramic powders 49 formed by talcum.
In addition, compacting ring and metal the 2nd liner (metal liner) 53 is being configured with towards the rear end side of the rear end conical surface 43, the compressed part 55 being positioned at the rear end of base metal part 15 is compressed to the inside, 2nd liner 53 is by pressing towards the rear end conical surface 43 (specifically glaze layer 47) towards ceramic enclosure body 9 thus, and ceramic enclosure body 9 is fixed by base metal part 15.
In addition, the 2nd liner 53 is such as made up of SUS 430, the circular metal gasket be radius (radius of inner peripheral portion) being 5mm.Further, the cross section (cross section along axle center) of the 2nd liner 53 is rounded, and the radius in its cross section is such as 0.4mm.
Described terminal component 11 is such as made up of Inconel750 (English イ ンコネル society, brand name), roughly in barrel shape, has outgoing side portion of terminal 57, component side portion of terminal 59 and the connecting portion 61 both connection.
Wherein, outgoing side portion of terminal 57 is configured to the tubular of the substantially C-shaped shape in cross section orthogonal to the axial direction, and carry out elasticity when the lid terminal 65 (with reference to Fig. 5) of lid terminal component 63 is inserted the inner side of self and connects expanding.
On the other hand, component side portion of terminal 59 has the barrel shape of the substantially C-shaped shape in cross section orthogonal to the axial direction.This component side portion of terminal 59 is carried out elasticity undergauge and is inserted in gas detecting element 3, and is electrically connected with medial electrode 7.
B), below, the glaze pottery enclosure body 10 as the major part of present embodiment is described in detail according to Fig. 2 and Fig. 3.
Illustrating as in fig. 2 a part of cutting also amplified, the glaze layer 47 that glaze pottery enclosure body 10 has ceramic enclosure body 9 and formed in a part for its outside surface.
Specifically, ceramic enclosure body 9 has the minor diameter part 41 of rear end side and the large-diameter portion 39 of front, and has the enclosure body bight 67 connected between minor diameter part 41 and large-diameter portion 39.
Further, be formed with the boundary member towards the rear end conical surface 43 annular recessed portion 71 being cut into ring-type at the outer peripheral face 69 of large-diameter portion 39.
In addition, as in figure 3 by the B portion of Fig. 1 amplify illustrate, glaze layer 47 from the outside surface of ceramic enclosure body 9 large-diameter portion 39 towards the rear end conical surface 43, the rear end being formed into the outside surface 45 of minor diameter part 41 by enclosure body bight 67 always.
In addition, in the ceramic enclosure body 9 shown in Fig. 3, than base metal part 15 upper end (rear end) by the top (rear) be exposed to outside part and belong to enclosure body exposed division 9A (with reference to Fig. 6), belong to enclosure body covering part 9B than the upper end part on the lower (until intersection point of annular recessed portion 71 and large-diameter portion 39) of base metal part 15.In addition, enclosure body main part 9C is formed by enclosure body exposed division 9A and enclosure body covering part 9B.Further, at this, upper end from its upper end up to enclosure body bight 67 in enclosure body covering part 9B is called enclosure body covering part 9b.
This glaze layer 47 is such as by containing SiO
2: 77.5wt%, Al
2o
3: 12.1wt%, MgO:3.4wt%, K
2o:5.4wt%, Na
2o:1.4wt%, CaO:0.1wt%, Fe
2o
3: the glaze of 0.1wt% is formed.
Especially in the present embodiment, the thickness of glaze layer 47 is not homogeneous, glaze layer 47 outside surface of enclosure body bight 67 (especially on) on the outside surface of enclosure body covering part 9B caves in smoothly to radially inner side, forms the recess 73 that the thickness of the glaze layer 47 on the Thickness Ratio enclosure body exposed division 9A of the glaze layer 47 on enclosure body covering part 9B is thin thus.
Namely, when observing outside surface (fore-end from the front of minor diameter part 41 to enclosure body bight 67) of the glaze layer 47 on minor diameter part 41 along axis A, the recess 73 of glaze layer 47 becomes the shape that the glaze layer 47 compared on enclosure body covering part 9B enters inner side completely.
Specifically, the thickness of the glaze layer 47 on the outside surface 45 on enclosure body exposed division 9A in the scope of 15 ~ 100 μm, such as, is 20 μm, and the thickness of glaze layer 47 in recess 73 is in the scope of 1 ~ 10 μm thinner than it.
In addition, the thickness of glaze layer 47 is along with thinning gradually near front (below Fig. 3) from recess 73.
In addition, the radius-of-curvature of the outside surface of recess 73 is below 1.0mm, such as, be 0.6mm.
At this, when when observing in the cross section of axis A as shown in Figure 3, the scope in enclosure body bight 67 shows the R shape formed towards smooth connection between the rear end conical surface 43 of the outside surface 45 of the minor diameter part 41 of linearity and linearity, and recess 73 has thinner than the thickness of the glaze layer 47 on enclosure body exposed division 9A on the outside surface in this enclosure body bight 67 and to the bending concave part of radially inner side.
In addition, as shown in the drawing, compressed to the inside by the compressed part 55 of base metal part 15 at the 2nd liner the 53,2nd liner 53 that is configured with on the glaze layer 47 on the rear end conical surface 43 of large-diameter portion 39.
Now, the 2nd liner 53 leaves recess 73 and configures.That is, the 2nd liner 53 does not abut with recess 73, even when thus being compressed to the inside by the compressed part 55 of base metal part 15 and be applied in pressing force, also directly can not apply pressing force to the recess 73 on enclosure body covering part 9B.
C), below, the manufacture method of the gas sensor 1 of present embodiment is described.
When manufacturing ceramic enclosure body 9, first the insulating ceramics powder such as aluminium oxide being allocated according to predetermined ratio, utilizing known drawing or extrusion molding to be shaped, make the formed body becoming the original shape of ceramic enclosure body 9 thus.In addition, according to circumstances also body can be cut in cutting process.
Then, sinter this formed body at a predetermined temperature, manufacture ceramic enclosure body 9 thus.
(the formation method of glaze layer 47)
Below, about the formation method of glaze layer 47, be described according to Fig. 4 A-4C.
First, the glaze material of mentioned component is dissolved in water or solvent make glaze slip.
Then, shown in Fig. 4 A, from spray nozzle 81, this glaze slip is sprayed to the outside surface of ceramic enclosure body 9.Thus, as shown in Figure 4 B, on the outside surface of ceramic enclosure body 9, specifically at the outside surface 45 of minor diameter part 41 and form glaze material layer 83 on the rear end conical surface 43.Now, glaze material layer 83 increases by the thickness of surface tension on enclosure body bight 67.
Then, shown in Fig. 4 C, glaze material layer 83 is blown, remove unnecessary glaze slip from enclosure body bight 67 grade.Specifically, utilize air nozzle 85 to spray air along the surface towards the rear end conical surface 43, the surface portion towards the glaze slip on the rear end conical surface 43 is removed, and removes unnecessary glaze slip from enclosure body bight 67.
Thus, make the thickness towards the glaze material layer 83 on the Thickness Ratio minor diameter part 41 of the glaze material layer 83 on the rear end conical surface 43 and the glaze material layer 83 on enclosure body bight 67 thin.Consequently, on the outside surface in enclosure body bight 67, glaze material layer 83 is in the shape (shape of recess 73) of depression.
Then, after glaze material layer 83 is dried, sinter with predetermined temperature, form the glaze layer 47 with the shape of present embodiment.Thus, glaze pottery enclosure body 10 has been made.
In addition, except the painting method based on aforementioned spraying, in addition ceramic enclosure body 9 is immersed in the method added in the tank of glaze slip, the rotary body of the glaze slip that made ceramic enclosure body 9 and surface coated contacts, and makes the method etc. that ceramic enclosure body 9 and rotary body rotate.
In addition, about the formation method of other glaze layer, method as described below can be enumerated.
After utilizing glaze slip to form glaze material layer 83, utilize and there is the materials such as absorptive sponge draw unnecessary glaze slip method from enclosure body bight 67.
After utilizing glaze slip to form glaze material layer 83, utilize hairbrush etc. from enclosure body bight 67, mechanically remove the method for unnecessary glaze slip.
And non-used glaze slip forms glaze material layer 83, but use the glaze material of sheet (film-form) on ceramic enclosure body 9, form the method for glaze material layer 83.Now, make glaze material layer 83 Thickness Ratio on enclosure body bight 67 thinner.
(manufacture method of gas sensor 1 entirety)
Below, the manufacture method of gas sensor 1 entirety is described.
As shown in Figure 1, the shell 13 that base metal part 15 and protective cover 17 one-tenth are integrated is prepared.
Then, lateral electrode 5 and the gas detecting element 3 of medial electrode 7 will be provided with insert together with the 1st liner 33 inside of shell 13.
Then, in the rear end side of the flange part 19 of gas detecting element 3, in the gap portion of base metal part 15 and gas detecting element 3, fill the ceramic powders 49 of scheduled volume.
Then, (making through above-mentioned technique) glaze pottery enclosure body 10 is inserted in the mode got involved between gas detecting element 3 and base metal part 15, front end face is abutted with ceramic powders 49.
Then, the rear end side of base metal part 15 compressed and forms compressed part 55, making the 2nd liner 53 get involved between the compressed part 55 and glaze pottery enclosure body 10 of base metal part 15 thus, above-mentioned component parts is integrally fixed.
Finally, terminal component 11 is inserted the inner side of glaze pottery enclosure body 10 and gas detecting element 3.Specifically, make component side portion of terminal 59 flexibly undergauge inserting in gas detecting element 3, and be electrically connected with medial electrode 7.Meanwhile, outgoing side portion of terminal 57 be configured in the inner side of glaze pottery enclosure body 10 and make it abut the inner side of glaze pottery enclosure body 10.
Complete gas sensor 1 like this.
D), below, the gas sensor lid of the rear end side being embedded in gas sensor 1 is described according to Fig. 5.
As shown in Figure 5, gas sensor lid 91 has lid terminal component 63, the insulation division 93 covering lid terminal component 63 and wire 95.
Lid terminal component 63 is such as made up of SUS 310S, and the lid terminal 65 with substantially cylindrical shape compresses and the compressed part 99 be connected with by wire 95.Wherein, lid terminal 65 has rigidity, in the outgoing side portion of terminal 57 being inserted into gas sensor 1 and when connecting, self is indeformable, and makes outgoing side portion of terminal 57 expanding.
The compressed part 99 of one end tegmentum terminal component 63 of wire 95 compresses, and is electrically connected with lid terminal 65.Therefore, it is possible to the output signal of the gas detecting element 3 from gas sensor 1 is sent to external device (ED) by wire 95.
Insulation division 93 uses fluorine class rubber to be shaped as hollow shape, has contiguity portion 97 at insulation division 93.
This gas sensor lid 91 is configured in insulation division 93, make lid terminal component 63 and contiguity portion 97 arranged coaxial, makes the wire 95 be connected with lid terminal component 63 extend to outside from insert port 101.
E), below, the gas sensor unit with gas sensor 1 and gas sensor lid 91 is described according to Fig. 6.
As shown in Figure 6, the rear end side of gas sensor lid 91 fitted in gas sensor 1 is formed by gas sensor unit 111, is installed in gas outlet 23 and uses, to detect the oxygen concentration in the exhaust of internal combustion engine.
Specifically, gas sensor 1 is positioned at gas outlet 23 with the front comprising protective cover 17, is exposed to outside state is screwed togather and be installed on gas outlet 23 than the part of the side rearward, threaded portion 25 of base metal part 15.In addition, the lateral electrode 5 be now electrically connected with base metal part 15 is implemented main body ground connection by base metal part 15.
Then, the lid terminal 65 of gas sensor lid 91 is inserted the inner side of the outgoing side portion of terminal 57 of gas sensor 1, gas sensor lid 91 is installed on gas sensor 1.
Now, have gap (S) between the lower end of gas sensor lid 91 and base metal part 15, in this gap portion, the outer peripheral face (specifically the outer peripheral face of glaze layer 47) of glaze pottery enclosure body 10 is exposed to outside.In addition, this exposed portion is enclosure body exposed division (immersion portion) 9A.
F), below, the effect of present embodiment is described.
In the gas sensor 1 of present embodiment, pottery enclosure body 9 is formed with glaze layer 47 to large-diameter portion 39 towards the rear end conical surface 43 via the outside surface in enclosure body bight 67 from the outside surface 45 of the radial direction of minor diameter part 41, glaze layer 47 on enclosure body covering part 9B has the recess 73 to radially inner side depression, makes thinner than the thickness on enclosure body exposed division 9A.
In other words, when the outside surface of the glaze layer 47 on axially visual confirmation enclosure body exposed division 9A, the recess (recess on such as enclosure body bight 67) 73 of glaze layer 47 to radially inner side depression, thus visual confirmation less than.
Namely, in the present embodiment, the recess 73 that glaze layer 47 caves in the inside in the first-class formation in enclosure body bight 67, glaze can not be trapped in enclosure body bight 67 as before and make glaze layer 47 thickening, and thus the 2nd liner 53 is difficult to touch the first-class recess in enclosure body bight 67 73.
Therefore, when being utilized base metal part 15 that glaze pottery enclosure body 10 is compressed and fixed by the 2nd liner 53, even by be applied with from radial outside based on compress pressing force when, particularly power also directly can not be applied to the recess 73 on enclosure body bight 67.
In addition, in the present embodiment, glaze layer 47 on enclosure body covering part 9B is thinner (depression), thus the 2nd liner 53 when (axle central side) pushing is mobile by the inside when compressing, even during location contacts beyond recess 73, the loading being applied to glaze layer 47 is also little, and thus glaze layer 47 is not easy to crack.
Therefore, glaze layer 47 not easily cracks and breakage, thus also can suppress the damage of ceramic enclosure body 9 self.Consequently, the output of gas sensor 1 etc. can be reduced and produce abnormal, the risk of gas sensor 1 fault.
In addition, in the present embodiment, by arranging recess 73, do not need to make glaze layer 47 integral thinned.Therefore, by making the glaze layer 47 of enclosure body exposed division 9A thickening, even when enclosure body exposed division 9A soaks, the breakage of the ceramic enclosure body 9 caused because of its thermal shock also effectively can be suppressed.
In the present embodiment, the surface configuration of recess 73 has the radius-of-curvature of below 1.0mm.If the radius-of-curvature of this scope, then effectively can suppress the generation of the crackle of glaze layer 47 etc.
In the present embodiment, the thickness of the recess 73 of glaze layer 47 is in the scope of 1 ~ 10 μm.If the glazed thickness of this scope, then effectively can suppress the generation of the crackle of glaze layer 47 etc.
In the present embodiment, the thickness of the glaze layer 47 on enclosure body exposed division 9A in which part all in the scope of 15 ~ 100 μm.If the glazed thickness of this scope, then can alleviate the thermal shock formed because of immersion, effectively suppress the generation of the crackle of ceramic enclosure body 9 etc.
The gas sensor unit 111 of present embodiment is formed at above-mentioned gas sensor 1 installing gas sender unit cap 91.
This gas sensor unit 111 is when being installed in gas outlet 23 grade and using, and between gas sensor 1 and gas sensor lid 91, the enclosure body exposed division 9A of ceramic enclosure body 9 is exposed to outside, and thus thermal diffusivity is good.Further, owing to being formed with glaze layer 47 on the surface of ceramic enclosure body 9, even also there is higher resistance to sudden heating when thus soaking.In addition, gas sensor 1 adopts the gas sensor 1 of above-mentioned structure, and thus glaze layer 47 and ceramic enclosure body 9 are difficult to breakage, therefore have higher permanance.
[with the corresponding relation of claim]
At this, the corresponding relation of the statement in claim and present embodiment is described.
2nd liner 53 is equivalent to an example of metal liner.
Embodiment 1
In order to confirm effect of the present invention, following measurement and experiment are carried out.
(dimensional measurement)
For the gas sensor 1 of aforementioned embodiments glaze pottery enclosure body 10, namely utilize blowing process have adjusted the shape of glaze layer 47 glaze pottery enclosure body 10, measure the size of each several part.
Specifically, in the front end (flange lower end) from glaze pottery enclosure body 10 in each position (scope of the enclosure body bight 67 shown in Fig. 7, upper enclosure body covering part 9b, enclosure body exposed division 9A) of rear end, measure the thickness (glaze thickness) of glaze layer 47.In addition, glaze thickness refers to and the size on axially vertical direction.Its result is as shown in the example of Fig. 8.
In addition, as comparative example, only the formation method of glaze layer adopts technique in the past (not implementing the method for blowing), and other adopts the method identical with aforementioned embodiments, has made glaze pottery enclosure body, and has similarly measured glaze thickness.Its result is as shown in the past example of Fig. 8.
According to earlier figures 8, in the gas sensor of present embodiment, the thickness thin (being namely formed with recess 73) of the glaze layer 47 on the Thickness Ratio enclosure body exposed division 9A of the glaze layer 47 on upper enclosure body covering part 9b.Therefore, known as mentioned above, the generation of the crackle of glaze layer 47 can be suppressed.
In addition, in a comparative example, the thickness of the glaze layer on the Thickness Ratio enclosure body exposed division of the glaze layer in known upper enclosure body covering part is thick.
(experimental example)
In this experimental example, as the sample used in an experiment, make the gas sensor 1 with aforementioned embodiments same configuration, and by regulating air blowing when forming glaze layer 47, change the shape of the recess 73 of glaze layer 47 and the radius (R) of recess 73.In addition, except recess 73, the 2nd liner 53 grade is identical with aforementioned embodiments.
Specifically, as described in Table 1, as the present invention's example, the gas sensor (radius R of recess 73 is 0.4 ~ 1.0mm) of sample No.1 ~ 7 has been made.Further, as comparative example, the gas sensor (radius R of recess is 1.1 ~ 1.5mm) of sample No.8 ~ 12 has been made.
In an experiment, carry out the compression of base metal part 15, confirm whether ceramic enclosure body creates crackle by this compression.
Its result as described in Table 1.Zero expression in table 1 does not have sleeve crackle, × indicate sleeve crackle.In addition, sleeve crackle refers to the crackle of glaze pottery enclosure body 10.
[table 1]
Known according to this table 1, in example of the present invention, the radius R (R size) of recess 73, in the scope of 0.4 ~ 1.0mm, does not thus produce sleeve crackle.On the other hand, in a comparative example, the R of recess is of a size of 1.1 ~ 1.5mm, thus creates sleeve crackle.
In addition, the invention is not restricted to the embodiment of above detailed description, also can carry out various change without departing from the scope of spirit of the present invention.
Claims (5)
1. a gas sensor, is characterized in that, has:
Gas detecting element, described gas detecting element is to axial extension, and front is exposed in measured gas;
Base metal part, described base metal part surrounds around described gas detecting element; And
Pottery enclosure body, described ceramic enclosure body is formed by insulating ceramics and is tubular, and around the rear end side of surrounding described gas detecting element and under the rear end side of described ceramic enclosure body self state more outstanding than the rear end of described base metal part, be fixed by this base metal part by metal liner
Described ceramic enclosure body has enclosure body main part, described enclosure body main part is included in and is exposed to outside enclosure body exposed division and in the enclosure body covering part covered by this base metal part than more forward side, the rear end of described base metal part in side more rearward than the rear end of described base metal part
The outside surface of described enclosure body main part self has glaze layer,
Described glaze layer in described enclosure body covering part has the recess that the described glaze layer compared on described enclosure body exposed division caves in radially inner side,
Described metal liner is at least connected to the position beyond the described recess in described glaze layer.
2. gas sensor according to claim 1, wherein,
The surface configuration of described recess has the radius-of-curvature of below 1.0mm.
3. gas sensor according to claim 1 and 2, wherein,
The thickness of the described glaze layer on described recess is in the scope of 1 ~ 10 μm.
4. according to the gas sensor in claims 1 to 3 described in any one, wherein,
The thickness of the described glaze layer on described enclosure body exposed division is in the scope of 15 ~ 100 μm.
5. a gas sensor unit, is characterized in that, described gas sensor unit comprises:
Gas sensor, described gas sensor has gas detecting element, base metal part, pottery enclosure body and terminal component, described gas detecting element is to axial extension, front is exposed in measured gas, described base metal part surrounds around described gas detecting element, described ceramic enclosure body is formed by insulating ceramics and is tubular, and around the rear end side of surrounding described gas detecting element and under the rear end side of described ceramic enclosure body self state more outstanding than the rear end of described base metal part, be fixed by this base metal part by metal liner, described terminal component is connected with the medial electrode formed on the inner peripheral surface of described gas detecting element and the output signal from described gas detecting element is outputted to outside, and
Gas sensor lid, the lid terminal that described gas sensor lid has tubular and the insulation division formed by the elastic body of insulativity, described lid terminal is connected with the described terminal component of described gas sensor, and described output signal is sent to external device (ED), described insulation division covers the rear end side of this lid terminal and described ceramic enclosure body
Described gas sensor adopts according to the gas sensor in Claims 1 to 4 described in any one.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012181169 | 2012-08-17 | ||
| JP2012-181169 | 2012-08-17 | ||
| PCT/JP2013/071810 WO2014027642A1 (en) | 2012-08-17 | 2013-08-12 | Gas sensor and gas sensor unit |
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| Publication Number | Publication Date |
|---|---|
| CN104583766A true CN104583766A (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201380043797.7A Pending CN104583766A (en) | 2012-08-17 | 2013-08-12 | Gas sensor and gas sensor unit |
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| Country | Link |
|---|---|
| JP (1) | JPWO2014027642A1 (en) |
| CN (1) | CN104583766A (en) |
| WO (1) | WO2014027642A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7269834B2 (en) * | 2019-08-28 | 2023-05-09 | 京セラ株式会社 | gas detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4465253B2 (en) * | 2003-12-18 | 2010-05-19 | 日本特殊陶業株式会社 | Gas sensor and gas sensor unit |
| JP2007107935A (en) * | 2005-10-11 | 2007-04-26 | Ngk Spark Plug Co Ltd | Sensor unit and sensor cap |
| JP2012112739A (en) * | 2010-11-24 | 2012-06-14 | Ngk Spark Plug Co Ltd | Gas sensor, gas sensor manufacturing method, and gas sensor unit |
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2013
- 2013-08-12 CN CN201380043797.7A patent/CN104583766A/en active Pending
- 2013-08-12 JP JP2013553712A patent/JPWO2014027642A1/en active Pending
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| JPWO2014027642A1 (en) | 2016-07-28 |
| WO2014027642A1 (en) | 2014-02-20 |
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