CN103718034B - Gas sensor - Google Patents
Gas sensor Download PDFInfo
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- CN103718034B CN103718034B CN201280037576.4A CN201280037576A CN103718034B CN 103718034 B CN103718034 B CN 103718034B CN 201280037576 A CN201280037576 A CN 201280037576A CN 103718034 B CN103718034 B CN 103718034B
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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
Abstract
Provided is a gas sensor capable of reliably securing and protecting a ceramic member inside a casing. An oxygen sensor (1) is provided with: a cylindrical detection element (6); a main bracket (5) for holding the detection element (6); a terminal bracket (70) which is electrically connected to the detection element (6); a lead line (18) extending from the terminal bracket (70) and forming a current path; a separator (8) through which the lead line (18) is inserted; an inner cylinder (3) surrounding the separator (8); a grommet (9) arranged in the cylinder hole of the inner cylinder (3), the lead line (18) being inserted through the grommet; a filter (7) arranged on the outside, in the radial direction, of the inner cylinder (3); and an outer cylinder (100), the filter (7) being positioned between the outer cylinder and the inner cylinder (3). The separator (8) is sandwiched by the detection element (6) and the grommet (9), and thereby held in a state of being set apart from the inner cylinder (3).
Description
Technical field
The present invention relates to lambda sensor, HC sensor, NO
xsensor is for detecting the gas sensor of the detected composition become in the gas of measuring object.
Background technology
In the past, be configured with the gas sensor of detecting element as everyone knows in the inner side of metal shell, this detecting element is formed with the test section for detecting detected composition on top.In such gas sensor, be provided with ceramic component (so-called separator) in the inside of shell, this ceramic component is kept for the wire obtaining detection signal from detecting element.Propose various method separator being fixed on the inside of shell all the time.
Such as, Patent Document 1 discloses a kind of gas sensor, this gas sensor, under the state keeping metal parts to be arranged between shell and separator, fixes separator from outside by shell crimp.Patent Document 2 discloses the gas sensor utilizing the maintenance metal parts being pressed into the inside of shell to fix separator.Patent Document 3 discloses a kind of gas sensor, this gas sensor utilizes a pair elastic component (grommet and containment member) being arranged at the inside of shell clamp in the axial direction and fix separator.
At first technical literature
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2010-276337 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2010-223750 publication
Patent documentation 3: Japanese Unexamined Patent Publication 2000-81412 publication
But, in the gas sensor disclosed in patent documentation 1,2, when producing vibration, impact in gas sensor, there is the position skew producing and keep metal parts, and then the hidden danger of the position skew of generation separator.In addition, owing to using the parts peculiar (in other words, keeping metal parts) being used for fixing separator, therefore there is the hidden danger that the number of parts of gas sensor and the minimizing of manufacturing cost, the miniaturization etc. of gas sensor are counteracted.In addition, in the gas sensor disclosed in patent documentation 3, the rear end side of the separator of a pair elastic component clamping is utilized only to utilize the outer barrel member protection of the surrounding surrounding interior barrel member.Therefore, when applying external pressure to gas sensor, there is the hidden danger that separator is easily damaged.
Summary of the invention
The present invention completes to solve above-mentioned problem, its object is to provide a kind of gas sensor, and this gas sensor is reliably fixed in the inside of shell and protection ceramic component
It is characterized in that of the gas sensor of a mode of the present invention, comprise: detecting element, it extends in the axial direction, in the tubular that the tip side towards measuring object is closed, the outer peripheral face of this detecting element self is provided with lateral electrode, the inner peripheral surface of this detecting element self is provided with medial electrode; Base metal housing, it surrounds around above-mentioned detecting element, and keeps above-mentioned detecting element; The terminal metal parts of tubular, it is inserted in the bore of above-mentioned detecting element, and is electrically connected with the above-mentioned medial electrode of above-mentioned detecting element; Wire, it is connected to above-mentioned terminal metal parts, backward from above-mentioned terminal metal parts extends and forms current path in side; Ceramic component, it is configured at the rear end side of above-mentioned detecting element, and has at least either party through hole run through in above-mentioned terminal metal parts and above-mentioned wire; Inner core, it is the hardware of the tubular of the surrounding surrounding above-mentioned ceramic component, and the tip side of this inner core is fixed on the rear end side of aforementioned body metal shell, and is formed with the first entrance hole for importing gas in the inside of this inner core self; Elastic component, it is configured at the rear end side of the above-mentioned ceramic component in the bore of above-mentioned inner core, presses above-mentioned inner core and have the through hole run through for above-mentioned wire from inner side to radial outside; Filtrator, it configures in the mode of above-mentioned first entrance hole of shutoff at the radial outside of above-mentioned inner core; And urceolus, it is the metal parts of the tubular of the surrounding surrounding above-mentioned inner core, between this urceolus and above-mentioned inner core, install above-mentioned filtrator, and on above-mentioned filtrator, be formed with the second entrance hole for importing gas in above-mentioned space; Above-mentioned ceramic component is directly clamped by above-mentioned detecting element and above-mentioned elastic component, or is clamped across miscellaneous part by above-mentioned detecting element and above-mentioned elastic component, thus is retained as the state be separated with above-mentioned inner core.
In addition, on the basis of the gas sensor of a mode of the present invention, preferably, be formed with edge part in the top ends of above-mentioned elastic component, this edge part is outstanding to above-mentioned axis direction tip side, and is configured in the gap between above-mentioned ceramic component and above-mentioned inner core.
In addition, on the basis of the gas sensor of a mode of the present invention, preferably, above-mentioned first entrance hole is formed at than the position of the abutted position between above-mentioned inner core and above-mentioned elastic component by tip side.In addition, though preferably the first entrance hole whole are formed at abutted position than inner core and elastic component by the position of tip side, also can be that a part for the first entrance hole is formed at the position leaning on tip side than inner core and the abutted position of elastic component.
In addition, on the basis of the gas sensor of a mode of the present invention, also can be, above-mentioned terminal metal parts have the flange part expanded to radial outside from the rearward end of these terminal metal parts self, and the flange part of above-mentioned terminal metal parts is clamped between above-mentioned detecting element and above-mentioned ceramic component.
In addition, on the basis of the gas sensor of a mode of the present invention, also can be that above-mentioned detecting element take zirconia as principal ingredient, and above-mentioned ceramic component take aluminium oxide as principal ingredient.
According to the gas sensor of a mode of the present invention, ceramic component is directly clamped by detecting element and elastic component or is clamped across miscellaneous part by detecting element and elastic component in the axial direction, and configures inner core, filtrator, urceolus successively at its radial outside.Thus, being limited towards axis direction and towards the movement of radial direction of ceramic component, ceramic component is stably fixed in the inside of shell (inner core and urceolus).In addition, because ceramic component is kept in the mode be separated with inner core, and by inner core, filtrator, urceolus triple protection, therefore the tolerance of ceramic component to the external pressure towards gas sensor is higher.Therefore, it is possible to reliably fix in the inside of shell and protection ceramic component.
If on the basis of the gas sensor of a mode of the present invention, edge part is formed in the top ends of above-mentioned elastic component, this edge part is to the outstanding and gap be configured between above-mentioned ceramic component and above-mentioned inner core of above-mentioned axis direction tip side, in this case, due to the movement towards radial direction utilizing edge part reliably to limit ceramic component, therefore, it is possible to more reliably fix ceramic component in the inside of shell.And then, such as, when producing vibration, impact in gas sensor, owing to preventing ceramic component from contacting with inner core, therefore also more reliably can protect ceramic component.
In addition, on the basis of the gas sensor of a mode of the present invention, also can be, air hole is formed in the position corresponding with the first entrance hole of inner core of elastic component, extraneous air is imported in detecting element, but as representative of the present invention, because ceramic component is separated with inner core, therefore, by the first entrance hole be formed at than ceramic component and elastic component abutted position by tip side position and the separate section between this ceramic component and inner core can be used as vent passage, easily extraneous air can be imported in detecting element through filter under the prerequisite or not forming air hole elastic component.
In addition, on the basis of the gas sensor of a mode of the present invention, at above-mentioned terminal metal parts, there is the flange part expanded from the rear end side of self towards radial outside, when being clamped between above-mentioned detecting element and above-mentioned ceramic component by the flange part of above-mentioned terminal metal parts, can simply construct reliably fixed terminal metal parts not arranging to utilize under the prerequisite for the special-purpose member of fixed terminal metal parts.
In addition, on the basis of the gas sensor of a mode of the present invention, when above-mentioned detecting element is principal ingredient with zirconia and above-mentioned ceramic component is principal ingredient with aluminium oxide, can by above-mentioned gas sensor application in such as lambda sensor etc.
Accompanying drawing explanation
Fig. 1 is the longitudinal section of lambda sensor 1.
Fig. 2 is the figure for being described the operation that protector 4 is configured at base metal housing 5.
Fig. 3 is the figure for being described the operation that detecting element 6 is configured at base metal housing 5.
Fig. 4 is the figure for being described the operation that filling component 15 and terminal metal parts 70 are configured at base metal housing 5.
Fig. 5 is the figure for being described the operation that sleeve 16, liner 17, inner core 3 are configured at base metal housing 5.
Fig. 6 is the figure for being described the operation forming crimp portion 57.
Fig. 7 is the figure for being described operation filtrator 7 being configured at downside assembly 200.
Fig. 8 is the figure for being described operation upside assembly 300 being configured at downside assembly 200.
Fig. 9 is the figure for being described the operation forming crimp portion 102,103,104.
Embodiment
Below, with reference to accompanying drawing, the gas sensor that the present invention has been specialized embodiment is described.First, with reference to Fig. 1, the structure of the lambda sensor 1 of the example as gas sensor is described.Lambda sensor 1 shown in Fig. 1 is installed on the gas outlet (not shown) of the discharge gas of discharging from the engine of the internal combustion engine of automobile etc., engine cylinder cover by the lambda sensor used.Below, on the axes O direction of lambda sensor 1, by (the side of closedown, side on the top towards the detecting element 6 be inserted in gas outlet, engine cylinder cover, i.e. downside in figure) as tip side, and the side (in figure upside) towards direction is in contrast to this described as rear end side.In addition, the radial direction of the direction orthogonal with axes O direction as lambda sensor 1 is described.
Lambda sensor 1 shown in Fig. 1 is for detecting the sensor that whether there is oxygen in the discharge gas that circulates in gas outlet.Lambda sensor 1 has and utilizes base metal housing 5 to surround and keep elongated and the structure of the detecting element 6 of the tubular of top closure.The wire 18 for obtaining the signal that detecting element 6 exports is pulled out from lambda sensor 1.Wire 18 is electrically connected with the electronic-controlled installation (ECU) of the not shown sensor control or automobile that are arranged at the position be separated with lambda sensor 1.
Detecting element 6 be with zirconia be principal ingredient solid electrolyte body 61 along axes O direction extend, be formed as the tubular of top closure, the inner circumferential side of detecting element 6 be provided with reference electrode 62, the outer circumferential side of detecting element 6 is provided with detecting electrode 63.Reference electrode 62 is made up of Pt or Pt alloy, is formed as vesicular in the mode of the almost whole inside surface covering solid electrolyte body 61.Detecting electrode 63 is made up of Pt or Pt alloy too, and the outside surface of solid electrolyte body 61 is formed as vesicular.Thus, the tip side (closed side) of detecting element 6 plays function as test section 64.Be exposed in the discharge gas of circulation in gas outlet (not shown) by making test section 64 and carry out gas concentration detection.Although not shown, but detecting electrode 63 is covered by the cavernous electrode protecting layer be made up of thermotolerance pottery, and protection detecting electrode 63 is not discharged gas and pollutes.In addition, be provided with in the roughly centre position in the axes O direction of detecting element 6 along with the wide diameter portion 65 outstanding in the circumferential towards radial outside.
Detecting element 6 is held in the bore 55 of base metal housing 5 with the state of footpath base metal housing 5 encirclement of tube shape towards periphery at self.Base metal housing 5 is the cartridges be made up of carbon steels such as stainless steel, S17C such as SUS430, is formed with the external thread part 52 screwed togather with the installation portion of gas outlet, engine cylinder cover (not shown) in tip side.Aforesaid test section 64 is outstanding to tip side in bore 55.Tool engagement portion 53 expanding is diametrically formed in the rear end side of the external thread part 52 of base metal housing 5.Lambda sensor 1 is installed on gas outlet, engine cylinder cover installation portion (not shown) time use erecting tools be sticked in tool engagement portion 53.Position intercalation between tool engagement portion 53 and external thread part 52 has the packing ring 11 of the ring-type for preventing the installation portion generation Leakage Gas via gas outlet, engine cylinder cover.The rearward end of base metal housing 5 is provided with the crimp portion 57 for fixed test element 6, inner core described later 3.The rearward end 66 of detecting element 6 is given prominence to side to the back-end than crimp portion 57.
In the bore 55 of base metal housing 5, be provided with stage portion 59, this stage portion 59 makes its inner circumferential give prominence to towards radially inner side.Aforesaid wide diameter portion 65 via the rearward end 46 of protector 4 described later engaging in stage portion 59.In other words, between stage portion 59 and wide diameter portion 65, the rearward end 46 of protector 4 is clamped along axes O direction.Be filled with in the mode of surrounding around detecting element 6 in the rear end side of wide diameter portion 65 noggin piece 15 be made up of talcum powder in bore 55.In addition, in bore 55, oxidation aluminum is configured with and tubular sleeve 16 in the rear end side mode of surrounding around detecting element 6 at noggin piece 15.The liner 17 of ring-type is configured with, to clamp the top ends 31 of inner core 3 described later between liner 17 and sleeve 16 in the rear end side of this sleeve 16.
By top orientation to the inside, the rearward end crimp of base metal housing 5 is formed crimp portion 57, top ends 31 and sleeve 16 are pressed against noggin piece 15 via liner 17.Noggin piece 15 is filled in the bore 55 of base metal housing 5, so that the wide diameter portion 65 of the stage portion 59 pressing detection element 6 towards base metal housing 5 by compression.Gap between the inner peripheral surface of bore 55 and the outer peripheral face of detecting element 6 is by filling component 15 filling in a gas tight manner.Like this, detecting element 6 is fixed by each component clamped via between the crimp portion 57 and stage portion 59 of base metal housing 5 in the bore 55 of base metal housing 5.
Cover from the test section 64 of the bore 55 of base metal housing 5 detecting element 6 outstanding to tip side by there being the protector 4 of bottom tube-like.Protector 4 prevents the collision of the test section 64 to detecting element 6 from outside, until lambda sensor 1 is installed on gas outlet, engine cylinder cover (not shown).The periphery of the open side of protector 4, i.e. rearward end 46 are bent and are processed into taper.Rearward end 46 is clamped by wide diameter portion 65 and stage portion 59 as described above, thus protector 4 is fixed with the state being accommodated with test section 64 in inside.Be formed at the side face of protector 4 and exhaust imported to the inner and introducing port 42 that is that guide to the test section 64 of detecting element 6 of protector 4.Be formed in the bottom surface of protector 4 for discharge enter into protector 4 inside water droplet, exhaust escape hole 43.
The inner core 3 of the tubular be made up of carbon steels such as stainless steel, S17C such as SUS304 is assembled with in the rear end side of base metal housing 5.Inner core 3 is formed as the tubular extended along axes O direction.Top ends 31 bending machining of inner core 3 becomes taper.By forming crimp portion 57 as described above, thus top ends 31 is clamped by sleeve 16 and liner 17, and inner core 3 is fixed with the state that side is outstanding to the back-end of the bore 55 from base metal housing 5.The inner core 3 extended from bore 55 towards rear end side surrounds the rearward end 66 of detecting element 6, the periphery of separator described later 8.
Terminal metal parts 70 are inserted with from the opening of rearward end 66 to the inner circumferential side (in other words bore 69) of the detecting element 6 surrounded by inner core 3.Terminal metal parts 70, in roughly tubular, are provided with the electrode contact 71 be connected with reference electrode 62 in tip side.The rearward end of terminal metal parts 70 is flange parts 72 outstanding to radial outside.Flange part 72 is clamped with separator 8 described later by the rearward end 66 of detecting element 6 on axes O direction.
Further, in the bore of terminal metal parts 70, be inserted with the connection metal parts 20 of the top ends being arranged at wire 18.Connection metal parts 20 have line (twisting thread) crimp in wire 18 and the base portion 21 carrying out being electrically connected, from base portion 21 backward the taper that extends of side the portion that is connected with 22, from being connected with the portion 22 roughly cylindric connecting portion 23 that extends of side and teat 24 from connecting portion 23 to radial outside that radially extend from backward.The base portion 21 of connection metal parts 20 inserts in bore 69, until teat 24 is positioned at the position (in other words, flange part 72 is engaging in the position of rearward end 66) contacted with the flange part 72 of terminal metal parts 70 to tip side.Now, connecting portion 23 contacts with the inner peripheral surface of electrode contact 71, and connection metal parts 20 are electrically connected with terminal metal parts 70, and then wire 18 is electrically connected with reference electrode 62.
Separator 8 is configured with in the rear end side of the rearward end 66 of detecting element 6.Separator 8 forms by insulating ceramics is formed as tubular, and has the through hole 81 made from running through on axes O direction.To through hole 81 run through from the connection metal parts 20 be configured in detecting element 6 backward side extend wire 18.
Be configured with grommet 9 in the rear end side of separator 8, this grommet 9 is made up of fluorine class rubber, EPDM etc.Grommet 9 is roughly cylindric in what extend on axes O direction, and has from the substantial middle position ring in axes O direction around geocentric vertical flange part 92 protruding outside.Ratio flange part 92 in grommet 9 leans on the front pillar portion 95 of tip side to be embedded in the opening 33 of the rear end side of inner core 3.And then, near opening 33 as described later such from outside by crimp, thus grommet 9 is fixed on inner core 3.In other words, front pillar portion 95 is to radial outside pressing inner core 3, thus inner core 3 is fixed on self by grommet 9.
Thus, in the inside of inner core 3, separator 8 is clamped by grommet 9 and detecting element 6 on axes O direction.And then, separator 8 is supported by grommet 9, thus is limited towards the movement of rear end side, and, support via the detected element 6 of other components (teat 24 of connection metal parts 20 and the flange part 72 of terminal metal parts 70), thus be limited towards the movement of tip side.In addition, the rear end face of separator 8 and the top plane-plane contact of grommet 9, and because the close property between the top end face of grommet 9 and the rear end face of separator 8 increases because of the elastic deformation of the top end face of grommet 9, therefore the movement towards circumference (in other words radial) of separator 8 is also restricted.
Further, remain in the inside of inner core 3 state that separator 8 is pressed against grommet 9, and the rearward end elastic deformation accordingly of grommet 9 and separator 8.Now, the recess 93 of the rearward end landfill for separator 8 is formed in the top ends central authorities of grommet 9.Form edge part 94 at the top ends periphery of grommet 9, this edge part 94 is outstanding to tip side along the profile of recess 93, and is configured at the gap between separator 8 and inner core 3.Thus, limited further towards the movement of radial direction by edge part 94 under separator 8 state that portion is accommodated in recess 93 in its back-end.
Identical with separator 8, grommet 9 also has the through hole 91 made from running through on axes O direction.Run through from the through hole 81 of separator 8 wire 18 that extends of side backward to through hole 91.In other words, the wire 18 be connected with reference electrode 62 via connection metal parts 20 and terminal metal parts 70 in detecting element 6 pulled into the outside of lambda sensor 1 via through hole 81,91.
Multiple hole portion running through the side face of inner core 3 is the first entrance hole 34 for importing to the inside of inner core 3 as the air (extraneous air) of reference gas.First entrance hole 34 is formed in order to ensure the inside to inner core 3 imports extraneous air the position leaning on tip side than inner core 3 and the abutted position of grommet 9.At the radial outside of inner core 3, be configured with the filtrator 7 of tubular in the mode of shutoff first entrance hole 34.Filtrator 7 is such as utilize the preventions such as the multiporous fiber tectosome of teflon penetrate based on the liquid of water droplet etc. and allow the watertightness filtrator of the gas penetration such as air and/or water vapor.
Be provided with hardware and the urceolus 100 of tubular at the radial outside of inner core 3, mounting filter 7 between this urceolus 100 and inner core 3 and this urceolus 100 surround around inner core 3.Be formed with crimp portion 104 in the rearward end of urceolus 100, the inside in this crimp portion 104 of grommet 9 embed wholly and this crimp portion 104 are in the form of a ring.Urceolus 100 is fixed the rear pillar portion 96 of ratio flange part 92 in grommet 9 side rearward by crimp portion 104.
In addition, multiple hole portion running through the side face of urceolus 100 is the second entrance hole 101 for importing to the inside of urceolus 100 as the air (extraneous air) of reference gas.Second entrance hole 101 is formed at the position corresponding with filtrator 7 in order to ensure supplying extraneous air towards filtrator 7.The tip side of the second entrance hole 101 in the side face of urceolus 100 is formed with the crimp portion 102 of ring-type, and the rear end side of the second entrance hole 101 in the side face of urceolus 100 is formed with the crimp portion 103 of ring-type.Crimp portion 102,103, along axes O direction the second entrance hole 101 to be clipped between both sides, press fixed outer cylinder 100 towards inner core 3, and filtrator 7 be clamped between urceolus 100 and inner core 3.
In addition, as mentioned above, because urceolus 100 is by inner core 3 crimp, therefore urceolus 100 preferably has flexibility of carrying out crimp processing easier than inner core 3.As an example, in the lambda sensor 1 of present embodiment, thermal treatment is utilized to make inner core 3 and urceolus 100 have difference of hardness.
According to above-mentioned structure, the extraneous air importing to the inside of urceolus 100 from the second entrance hole 101 imports to the inside of inner core 3 further from the first entrance hole 34.Now, filtrator 7 is utilized to stop the water droplet etc. contained by extraneous air to invade in inner core 3.In addition, between separator 8 and the rearward end 66 of detecting element 6, the teat 24 of radial connection metal parts 20 is utilized to be formed with the space 19 that can import extraneous air.The extraneous air imported in inner core 3 imports to the inside (being in other words bore 69) of detecting element 6 via space 19.
Like this, in the lambda sensor 1 of present embodiment, extraneous air imports to the inside of detecting element 6 as reference gas, and on the other hand, the exhaust imported from introducing port 42 contacts with the outside surface (in detail test section 64) of detecting element 6.And then the difference in oxygen concentration according to the surfaces externally and internally of detecting element 6 correspondingly produces oxygen concentration cell electromotive force.Obtain the detection signal of this oxygen concentration cell electromotive force as the oxygen concentration exhaust from reference electrode 62 via wire 18, thus the oxygen concentration of discharging in gas can be detected.
Next, with reference to Fig. 2 ~ Fig. 9, the manufacturing process of lambda sensor 1 is described.First, as shown in Figure 2, from the opening of the rearward end 56 of base metal housing 5, protector 4 is pressed in bore 55.Now, to top press-in escape hole 43 until the rearward end 46 of protector 4 is positioned at the position engaging in stage portion 59, protector 4 is temporarily fixed in base metal housing 5.
Next, as shown in Figure 3, by the opening of the rearward end 56 of base metal housing 5, detecting element 6 is inserted in bore 55.Now, insert test section 64 to top until the wide diameter portion 65 of detecting element 6 is positioned at the position of the rearward end 46 engaging in protector 4, detecting element 6 is temporarily fixed in base metal housing 5.
Next, as shown in Figure 4, noggin piece 15 is filled into detecting element 6 around by the opening via the rearward end 56 of base metal housing 5.Thus, the space of noggin piece 15 between the rear end side filling base metal housing 5 and detecting element 6 of wide diameter portion 65.In addition, terminal metal parts 70 are inserted into bore 69 by the opening via the rearward end 66 of detecting element 6.Now, to top electrode insertion contact site 71 until the flange part 72 of terminal metal parts 70 is positioned at the position of the rearward end 66 engaging in detecting element 6.Electrode contact 71 utilizes the spring force of self to radial outside effect to be fixed on bore 69 with the state contacted with reference electrode 62.
Next, as shown in Figure 5, sleeve 16, inner core 3, liner 17 are installed on detecting element 6 around by opening via the rearward end 56 of base metal housing 5 successively.Thus, sleeve 16 is connected to noggin piece 15 from rear end side, and the top ends 31 of inner core 3 is clamped by sleeve 16 and liner 17 on axes O direction, and inner core 3 forms the state erected from sleeve 16 towards rear end side.
Next, as shown in Figure 6, by the rearward end 56 of base metal housing 5 to radially inner side crimp to the position contacted with the outer peripheral face of inner core 3, crimp portion 57 is formed.Utilize form crimp portion 57 and the external pressure of paying liner 17 via the top ends 31 of inner core 3 to tip side pressing sleeve 16, noggin piece 15.Thus, wide diameter portion 65 is firmly clamped between filling component 15 and stage portion 59, and detecting element 6 is fixed.In addition, rearward end 46 is firmly clamped between wide diameter portion 65 and stage portion 59, and protector 4 is fixed.Further, top ends 31 is firmly clamped between sleeve 16 and liner 17, and inner core 3 is fixed.Utilize above operation to make base metal housing 5, protector 4, detecting element 6, inner core 3 etc. and be assembled into the integrally downside assembly 200 obtained.
Next, as shown in Figure 7, filtrator 7 is installed on downside assembly 200 by the mode covering the outer peripheral face of inner core 3 with the rear end side in crimp portion 57.Further, as shown in Figure 8, ready-made upside assembly 300 is assembled in the downside assembly 200 being provided with filtrator 7.The component that upside assembly 300 is grommets 9, urceolus 100, wire 18, separator 8 etc. are assembled into one and obtain, as long as make like that as described below.
Urceolus 100 before assembling has: rear cylinder portion 106, and it is the cylindrical portion of diameter roughly the same with rear pillar portion 96; Front barrel portion 105, it is arranged at than the position of rear cylinder portion 106 by tip side, and is the cylindrical portion of diameter roughly the same with flange part 92; And being connected with portion 107, it extends from the top edge in rear cylinder portion 106 to radial outside, and is connected with the end edge of front barrel portion 105.Aforesaid second entrance hole 101 is formed at front barrel portion 105.Via the tip side opening being connected with portion 107, grommet 9 is inserted in urceolus 100.Now, insert rear pillar portion 96 to the back-end until the flange part 92 of grommet 9 is positioned at the position in the portion that is connected with 107 engaging in urceolus 100, rear pillar portion 96 is embedded in rear cylinder portion 106.
And then, from rear end side, wire 18 is inserted into through hole 91, to the tip side pull-out wire 18 of grommet 9.Further, from rear end side, the wire 18 pulled out from grommet 9 is inserted into through hole 81, to the tip side pull-out wire 18 of separator 8.By base portion 21 to wire (twisting thread) crimp in the wire 18 pulled out from separator 8, thus connection metal parts 20 are fixed on wire 18.Thus, separator 8 is clamped between the teat 24 and grommet 9 of connection metal parts 20, makes upside assembly 300.
As shown in Figure 8, when upside assembly 300 being assembled in downside assembly 200, by the opening 33 of inner core 3, the connection metal parts 20 being installed on the tip side of wire 18 are inserted into the bore 69 of detecting element 6.Now, base portion 21 is inserted to top until the teat 24 of connection metal parts 20 is positioned at the position of the flange part 72 engaging in terminal metal parts 70.Connecting portion 23 utilizes the spring force of self to radial outside effect to be fixed on bore 69 with the state contacted with the inner peripheral surface of electrode contact 71.
On the other hand, along with the insertion of above-mentioned connection metal parts 20, the inner core 3 being provided with filtrator 7 is inserted in urceolus 100 via the tip side opening of front barrel portion 105, and the space between the front pillar portion 95 entering front barrel portion 105 and grommet 9.And then, under state engaging in the flange part 72 of terminal metal parts 70 of the teat 24 of connection metal parts 20, can further inwardly tip side press-in upside assembly 300 until the rearward end of cylinder 3 is positioned at the position of the flange part 92 engaging in grommet 9.Press-in upside assembly 300 if so, then grommet 9 is pressed against separator 8 and elastic deformation, forms recess 93 and edge part 94 in front pillar portion 95.In addition, in the present embodiment, grommet 9 is pressed against separator 8 and elastic deformation, thus is formed with recess 93 and edge part 94 in front pillar portion 95, but also before grommet 9 is pressed against separator 8, recess 93 and edge part 94 can be formed with in front pillar portion 95.
Finally, according to the assembled state shown in Fig. 8, as shown in Figure 9, respectively by the tip side of the second entrance hole 101 of front barrel portion 105 and rear end side circumferentially towards radially inner side crimp, form the crimp portion 102,103 of ring-type.Thus, urceolus 100 is pressed against inner core 3, and upside assembly 300 is fixed on downside assembly 200, and filtrator 7 is fixed between urceolus 100 and inner core 3.Further, by rear cylinder portion 106 circumferentially towards radially inner side crimp, the crimp portion 104 of ring-type is formed.Thus, urceolus 100 is pressed and becheduled for the detailed rear pillar portion 96 of grommet 9(), lambda sensor 1 completes.
As described above, lambda sensor 1 according to the present embodiment, separator 8 is clamped by detecting element 6 and grommet 9 on axes O direction, and, configure inner core 3, filtrator 7, urceolus 100 successively at its radial outside.Thus, being restricted towards axis direction and towards the movement of radial direction of separator 8, separator 8 is stably fixed in the inside of shell (inner core 3 and urceolus 100).In addition, because separator 8 keeps in the mode be separated with inner core 3, and utilize inner core 3, filtrator 7, urceolus 100 triple protection, the tolerance of separator 8 to the external pressure towards lambda sensor 1 is higher.Therefore, it is possible to reliably fix in the inside of shell and protection separator 8.
In addition, due to the movement towards radial direction utilizing the edge part 94 being formed at the top ends of grommet 9 reliably to limit separator 8, therefore, it is possible to more reliably fix separator 8 in the inside of shell.And then, such as, when lambda sensor 1 produces vibration, impact, owing to preventing separator 8 from contacting with inner core 3, therefore, it is possible to more reliably protect separator 8.
In addition, because the first entrance hole 34 is formed at the position leaning on tip side than inner core 3 and the abutted position of grommet 9, therefore, it is possible to separator 8 and the separated part of inner core 3 are used as vent passage, easily extraneous air can be imported in lambda sensor 1 through filter 7.
In addition, the flange part 72 expanded from the rearward end of terminal metal parts 70 to radial outside is clamped between detecting element 6 and separator 8, therefore, it is possible to simply construct reliably fixed terminal metal parts 70 not arranging to utilize under the prerequisite for the parts peculiar of fixed terminal metal parts 70.
But in the above-described embodiment, lambda sensor 1 is equivalent to " gas sensor " of the present invention.Separator 8 is equivalent to " ceramic component " of the present invention.In addition, the present invention is not limited to the embodiment of above detailed description, also can add various change without departing from the scope of spirit of the present invention.
In the above-described embodiment, separator 8 keeps a wire 18.Replacing this situation, also can be that separator 8 insulation keeps multiple conducting wires.In addition, in the above-described embodiment, separator 8 has the through hole 81 run through for wire.Replacing this situation, also can be at least either party through hole 81 run through that separator 8 has for terminal metal parts 70 and wire 18.Further, in the above-described embodiment, separator 8 is clamped by detecting element 6 and grommet 9 via other components (flange part 72 of terminal metal parts 70, the teat 24 etc. of connection metal parts 20).Replacing this situation, also can be that separator 8 is directly clamped by detecting element 6 and grommet 9.
In addition, in the above-described embodiment, as sensor of the present invention a mode and exemplified with the lambda sensor 1 as lambda sensor.But the present invention can be applied to the sensor that ceramic component is arranged at the inside of shell, this ceramic component is kept for the wire obtaining detection signal from detecting element.Thus, also can at such as HC sensor, NO
xthe present invention is applied in gas sensor beyond sensor lambda sensor.
The explanation of Reference numeral
1: lambda sensor
3: inner core
5: base metal housing
6: detecting element
7: filtrator
8: separator
9: grommet
18: wire
34: the first entrance holes
62: reference electrode
63: detecting electrode
70: terminal metal parts
72: flange part
81: through hole
91: through hole
100: urceolus
101: the second entrance holes
Claims (9)
1. a gas sensor, is characterized in that, comprising:
Detecting element, it extends in the axial direction, in the tubular that the tip side towards measuring object is closed, is provided with lateral electrode, is provided with medial electrode at the inner peripheral surface of this detecting element self at the outer peripheral face of this detecting element self;
Base metal housing, it surrounds around above-mentioned detecting element, and keeps above-mentioned detecting element;
The terminal metal parts of tubular, it is inserted in the bore of above-mentioned detecting element, and is electrically connected with the above-mentioned medial electrode of above-mentioned detecting element;
Wire, it is connected to above-mentioned terminal metal parts, backward from above-mentioned terminal metal parts extends and forms current path in side;
Ceramic component, it is configured at the rear end side of above-mentioned detecting element, and has at least either party through hole run through in above-mentioned terminal metal parts and above-mentioned wire;
Inner core, it is the hardware of the tubular of the surrounding surrounding above-mentioned ceramic component, and the tip side of this inner core is fixed on the rear end side of aforementioned body metal shell, and on this inner core, be formed with the first entrance hole for importing gas to the inside of this inner core self;
Elastic component, it is configured at the rear end side of the above-mentioned ceramic component in the bore of above-mentioned inner core, presses above-mentioned inner core and have the through hole run through for above-mentioned wire from inner side to radial outside;
Filtrator, it configures in the mode of above-mentioned first entrance hole of shutoff at the radial outside of above-mentioned inner core; And
Urceolus, it is the hardware of the tubular of the surrounding surrounding above-mentioned inner core, between this urceolus and above-mentioned inner core, above-mentioned filtrator is installed, and on the position corresponding with above-mentioned filtrator of above-mentioned urceolus, is formed with the second entrance hole for importing gas to the inside of this urceolus;
Above-mentioned ceramic component is directly clamped by above-mentioned detecting element and above-mentioned elastic component, or is clamped across other components by above-mentioned detecting element and above-mentioned elastic component, thus is retained as the state be separated with above-mentioned inner core,
The hardness of above-mentioned urceolus is less than the hardness of above-mentioned inner core.
2. gas sensor according to claim 1, is characterized in that,
Be formed with edge part in the top ends of above-mentioned elastic component, this edge part is outstanding to above-mentioned axis direction tip side, and is configured in the gap between above-mentioned ceramic component and above-mentioned inner core.
3. gas sensor according to claim 1 and 2, is characterized in that,
Above-mentioned first entrance hole is formed at than the position of the abutted position between above-mentioned inner core and above-mentioned elastic component by tip side.
4. gas sensor according to claim 1 and 2, is characterized in that,
Above-mentioned terminal metal parts have the flange part expanded to radial outside from the rearward end of these terminal metal parts self,
The flange part of above-mentioned terminal metal parts is clamped between above-mentioned detecting element and above-mentioned ceramic component.
5. gas sensor according to claim 3, is characterized in that,
Above-mentioned terminal metal parts have the flange part expanded to radial outside from the rearward end of these terminal metal parts self,
The flange part of above-mentioned terminal metal parts is clamped between above-mentioned detecting element and above-mentioned ceramic component.
6. gas sensor according to claim 1 and 2, is characterized in that,
Above-mentioned detecting element take zirconia as principal ingredient, and above-mentioned ceramic component take aluminium oxide as principal ingredient.
7. gas sensor according to claim 3, is characterized in that,
Above-mentioned detecting element take zirconia as principal ingredient, and above-mentioned ceramic component take aluminium oxide as principal ingredient.
8. gas sensor according to claim 4, is characterized in that,
Above-mentioned detecting element take zirconia as principal ingredient, and above-mentioned ceramic component take aluminium oxide as principal ingredient.
9. gas sensor according to claim 5, is characterized in that,
Above-mentioned detecting element take zirconia as principal ingredient, and above-mentioned ceramic component take aluminium oxide as principal ingredient.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-250488 | 2011-11-16 | ||
| JP2011250488A JP5592336B2 (en) | 2011-11-16 | 2011-11-16 | Gas sensor |
| PCT/JP2012/007277 WO2013073170A1 (en) | 2011-11-16 | 2012-11-13 | Gas sensor |
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| CN103718034A CN103718034A (en) | 2014-04-09 |
| CN103718034B true CN103718034B (en) | 2015-07-22 |
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| JP (1) | JP5592336B2 (en) |
| CN (1) | CN103718034B (en) |
| WO (1) | WO2013073170A1 (en) |
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| JP5767196B2 (en) * | 2012-01-16 | 2015-08-19 | 日本特殊陶業株式会社 | Gas sensor |
| JP5989947B2 (en) * | 2012-10-17 | 2016-09-07 | 日本特殊陶業株式会社 | Gas sensor |
| JP5931701B2 (en) * | 2012-11-13 | 2016-06-08 | 日本特殊陶業株式会社 | Gas sensor |
| JP5934638B2 (en) * | 2012-12-14 | 2016-06-15 | 日本特殊陶業株式会社 | Gas sensor |
| JP6146271B2 (en) * | 2013-11-20 | 2017-06-14 | 株式会社デンソー | Gas sensor |
| JP6287098B2 (en) * | 2013-11-20 | 2018-03-07 | 株式会社デンソー | Gas sensor |
| JP6175004B2 (en) * | 2014-01-10 | 2017-08-02 | 日本特殊陶業株式会社 | Sensor |
| KR101612632B1 (en) * | 2014-12-05 | 2016-04-14 | 주식회사 현대케피코 | Vehicle gas sensor structure preventing deformation from heat |
| JP6908540B2 (en) * | 2018-02-15 | 2021-07-28 | 日本特殊陶業株式会社 | Gas sensor manufacturing method |
| JP6971203B2 (en) * | 2018-06-08 | 2021-11-24 | 日本特殊陶業株式会社 | Sensor |
| JP7151542B2 (en) * | 2019-02-21 | 2022-10-12 | 株式会社デンソー | sensor device |
| JP7123837B2 (en) * | 2019-03-15 | 2022-08-23 | 日本特殊陶業株式会社 | gas sensor |
| WO2020213323A1 (en) * | 2019-04-17 | 2020-10-22 | 日本特殊陶業株式会社 | Gas sensor |
| JP7332520B2 (en) * | 2020-03-30 | 2023-08-23 | 日本特殊陶業株式会社 | Gas sensor and protective member for gas sensor |
| JP7372870B2 (en) * | 2020-03-31 | 2023-11-01 | 日本碍子株式会社 | gas sensor |
| CN116609415B (en) * | 2023-03-13 | 2024-01-30 | 连云港感瓷电子科技有限公司 | Oxygen sensor for monitoring exhaust emission |
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| CN102830148A (en) * | 2011-06-14 | 2012-12-19 | 日本特殊陶业株式会社 | Gas sensor |
| CN103547916A (en) * | 2011-08-17 | 2014-01-29 | 日本特殊陶业株式会社 | Gas sensor |
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| JP3713148B2 (en) * | 1998-09-04 | 2005-11-02 | 日本特殊陶業株式会社 | Gas sensor and gas sensor manufacturing method |
| JP4716287B2 (en) * | 2006-10-18 | 2011-07-06 | 日本特殊陶業株式会社 | Sensor |
| JP2008134219A (en) * | 2006-10-30 | 2008-06-12 | Denso Corp | Gas sensor and related manufacturing method |
| JP4390841B2 (en) * | 2008-07-07 | 2009-12-24 | 日本特殊陶業株式会社 | Oxygen sensor |
| JP5310170B2 (en) * | 2009-03-24 | 2013-10-09 | 株式会社デンソー | Gas sensor and manufacturing method thereof |
| JP5662280B2 (en) * | 2011-08-17 | 2015-01-28 | 日本特殊陶業株式会社 | Gas sensor |
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| CN102830148A (en) * | 2011-06-14 | 2012-12-19 | 日本特殊陶业株式会社 | Gas sensor |
| CN103547916A (en) * | 2011-08-17 | 2014-01-29 | 日本特殊陶业株式会社 | Gas sensor |
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| JP2013104832A (en) | 2013-05-30 |
| CN103718034A (en) | 2014-04-09 |
| JP5592336B2 (en) | 2014-09-17 |
| WO2013073170A1 (en) | 2013-05-23 |
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