CN103547916A - Gas sensor - Google Patents
Gas sensor Download PDFInfo
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- CN103547916A CN103547916A CN201280023949.2A CN201280023949A CN103547916A CN 103547916 A CN103547916 A CN 103547916A CN 201280023949 A CN201280023949 A CN 201280023949A CN 103547916 A CN103547916 A CN 103547916A
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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
- G01N27/4078—Means for sealing the sensor element in a housing
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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
- G01N27/4062—Electrical connectors associated therewith
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Abstract
Provided is a gas sensor capable of preventing water from remaining in the clearance between members constituting an outer shape such as a metal shell and preventing the members constituting the outer shape from being corroded by the remaining water. The gas sensor (1) is provided with: a sensor element (10) extending along an axial direction; a metal shell (50) for holding the sensor element (10); an inner tubular member (70) equipped with a tubular portion (71) formed in a tubular form and a flange portion (72) formed extending outwards in a radial direction from an end side of the tubular portion (71), wherein the flange portion (72) is fixed by a crimping portion (55) of the metal shell (50); a tubular outer tubular member (80) for covering the outside of the inner tubular member (70) over the radial direction; and a tubular and water-shedding ventilation filter (75) disposed sandwiched between the inner tubular member (70) and the outer tubular member (80). The ventilation filter (75) protrudes toward the axial direction from an end of the outer tubular member (80) and has an end that contacts at least a part of the rear end facing surface of the crimping portion (55) of the metal shell (50).
Description
Technical field
The present invention relates to the gas sensor of the contained oxygen of emission gases that a kind of internal combustion engine that is suitable for detecting the vehicles such as, car two-wheeled from being equipped on discharges etc.
Background technology
In the past, gas sensor as detecting the contained oxygen concentration of emission gases, is known to a kind of sensor that is provided with the gas detecting element with oxygen conduction, wherein, this installation of sensors is in the gas outlet (for example,, with reference to patent documentation 1 to 3) of the internal combustion engine of vehicle.
Mostly gas outlet is that the bottom surface from engine along vehicle configures to rear portion extension, and the gas sensor that is sometimes installed on gas outlet is also configured near the bottom surface of vehicle.If so by gas sensor arrangement near the bottom surface of vehicle, the water sometimes splashing because of the wheel of vehicle is attached to gas sensor.
If the water that is attached to gas sensor enters the inside of sensor, likely produce the unfavorable conditions such as short-circuit of sensor internal, can not detect exactly the contained oxygen concentration of emission gases.For this reason, in the gas sensor of recording at patent documentation 1 to 3, adopted by measure emission gases oxygen concentration time become benchmark atmosphere to configuration in the intercommunicating pore of the inside guiding of gas sensor, there is the filtrator etc. of water repellency and make shipwreck to enter the structure of the inside of gas sensor.
Enumerating the sensor (with reference to Fig. 5) with the structure that the gas sensor recorded with patent documentation 1, patent documentation 2 is identical describes for example; in gas sensor P5; gas detecting element P1 is fixed in base metal housing P2, and utilizes the rear end side of metal urceolus P3 and protection urceolus P4 blanketing gas detecting element P1.
In this gas sensor P5, in the rear end side of gas detecting element P1, dispose the separator P6 of the rear end side that is located in urceolus P3, dispose in contact terminal metal shell P8 with medial electrode P7.In addition, the rear end side of this terminal metal shell P8 is disposed at the through hole P9 of separator P6, and is connected in through hole P9 with for taking out the lead-in wire P10 of sensor output.
And, on urceolus P3 and protection urceolus P4, be respectively equipped with intercommunicating pore P13 and intercommunicating pore P14.Intercommunicating pore P13 and intercommunicating pore P14 be the atmospheric side that makes to become oxygen reference source, be the member that the outside of gas sensor P5 and the space P11 of the rear end side of gas detecting element P1 are connected, and the space P11 of the rear end side of this gas detecting element P1 circulates between the P12 of the inner space of this space P11 and gas detecting element for air.In addition, between urceolus P3 and protection urceolus P4, dispose can supplied gas by and the filtrator P15 that stops water to pass through.
Patent documentation 1: TOHKEMY 2007-192800 communique
Patent documentation 2: TOHKEMY 2008-101956 communique
Patent documentation 3: TOHKEMY 2009-075066 communique
But, even if adopt as mentioned above configuration filter and shipwreck in intercommunicating pore to invade the structure of the inside of gas sensor, also to have the hidden danger of the unfavorable condition that produces following explanation.
That is, the gas sensor that patent documentation 1 to 3 is recorded is configured to, and profile forms by a plurality of cylindrical structural members that overlap, and the water capacity that is therefore attached to gas sensor is easily introduced into the gap of a plurality of cylindrical structural members under capillary effect.In the situation that the gas sensor P5 of Fig. 5, salt solution is easily introduced into the gap between gap, base metal housing P2 and the urceolus P3 between urceolus P3 and protection urceolus P4.The water being introduced into is stranded in this gap for a long time, becomes one of reason of cylindrical structural member corrosion.The corrosion of cylindrical structural member is associated with the formation of be full of cracks, through hole, and this be full of cracks, through hole become the path of the inside of the intrusion gas sensor that supplies water, and likely gas sensor cannot detect the contained oxygen concentration of emission gases exactly.
Particularly in the situation that for forming the varying in size of ionization tendency of the metal material of the adjacent cylindrical structural member that forms gap, for example, in the situation that the cylindrical structural member of stainless steel alloy system is adjacent with cylindrical structural member made of iron, the cylindrical structural member that ionization tendency is larger easily corrodes.
In addition, in recent years, in order to seek the miniaturization of gas sensor, carried out the research of shortening as the total length of the length of the length direction of gas sensor.The gas sensor P5 that enumerates Fig. 5 is example, can consider to shorten the length from base metal housing P2 to rear end.
Like this, the rear end of base metal housing P2 likely approaches to the top of protection urceolus P4 the degree that water is introduced under capillary effect.In this case, water is easy to be introduced into the gap between the rear end of base metal housing P2 and the top of protection urceolus P4.Once water is introduced into and is detained; thereby have and take the water droplet of this delay and be gathered together each other and form larger water droplet as core is attached to water droplet around; near the not only gap between the rear end of base metal housing P2 and the top of protection urceolus P4, and the moistening hidden danger of being also detained it that extends to.Its result, at least one of base metal housing P2 and protection urceolus P4 likely corrodes.
Summary of the invention
The present invention makes in order to address the above problem, and its object is to provide a kind of gas sensor of the corrosion of component that forms profile that can suppress in the gap of member that salt solution is stranded in the formation profiles such as base metal housing and suppress to be caused by hydropexis.
In order to achieve the above object, the invention provides following technical scheme.
Gas sensor of the present invention is a kind of being inserted into for the gas sensor in the stream of measured gas flow, it is characterized in that, this gas sensor is provided with: sensor element, and it extends along axis direction; Base metal housing, it is for keeping this sensor element; Interior barrel member, it comprises that the end side with above-mentioned direction of insertion opposition side that is fixed on this base metal housing is rear end side the cylinder portion that forms tubular and the flange part that extends to form to radial outside from the tip side of this portion, and the pressurizing and deformation fastening part that this flange part is arranged at the rear end side of aforementioned body metal shell covers and is fixed; Outer barrel member, it upwards covers the outside of the cylinder portion of this interior barrel member in whole footpath, and the top of this outer barrel member self is left and formed mutually on axis direction with the end face backwards of above-mentioned pressurizing and deformation fastening part; And breather filter, it is clamping and is configured in the tubular between above-mentioned interior barrel member and above-mentioned outer barrel member, and has water repellency; The top of above-mentioned breather filter barrel member from above-mentioned is outstanding towards axis direction, and the top of above-mentioned breather filter utilizes at least a portion to contact with the above-mentioned end face backwards of the above-mentioned pressurizing and deformation fastening part of aforementioned body metal shell.
According to gas sensor of the present invention, by means of the top of breather filter, salt solution is difficult to be stranded between interior barrel member and outer barrel member and between the pressurizing and deformation fastening part and interior barrel member of base metal housing.That is, the breather filter that is disposed at the outer circumferential side of interior barrel member and the inner circumferential side of outer barrel member has water repellency, and further towards base metal housing, configures highlightedly than the top of outer barrel member.For this reason, by configuration in the gap between inner core member and outer barrel member (gap radially), must have the breather filter of water repellency, thereby shipwreck is to be detained.In addition, due to the ground connection configuration that offsets of the top of breather filter and the pressurizing and deformation fastening part of base metal housing, therefore water is configured in than the gap between base metal housing and interior barrel member and leans on the breather filter of radial outside to stop, thereby become, be difficult to immerse in the gap between base metal housing and interior barrel member, and become and be difficult to be detained.More particularly, salt solution becomes and is difficult to be stranded in the gap between gap, pressurizing and deformation fastening part and the flange part between pressurizing and deformation fastening part and cylinder portion.And, owing to exposing the breather filter that has top and base metal housing to connect in the top of barrel member outside and the gap between base metal housing (gap of axis direction), thus salt solution be difficult to be stranded in the top of outer barrel member and the gap between base metal housing and near.
Like this, by salt solution be difficult to be stranded in gap between gap, base metal housing and the interior barrel member between interior barrel member and outer barrel member and the gap between outer barrel member and base metal housing and near, can suppress the generation of the corrosion of base metal housing, interior barrel member, outer barrel member.
In addition, preferably, the top of breather filter utilizes at least a portion to contact with the end face backwards of the pressurizing and deformation fastening part of base metal housing, and water does not enter the above-mentioned backwards between end face of the top of above-mentioned breather filter and above-mentioned pressurizing and deformation fastening part.
In foregoing invention, it is characterized in that, form the size of ionization tendency of metal material and the varying in size of the ionization tendency of the metal material of the above-mentioned outer barrel member of formation of above-mentioned interior barrel member.
Like this, in the situation that the member consisting of the less metal material of ionization tendency and the member that consists of the larger metal material of ionization tendency are used in to gas sensor, if salt solution is present between two members, the member consisting of the larger metal material of ionization tendency is easier to produce corrosion.Yet, in gas sensor of the present invention, by means of breather filter, salt solution is difficult to be stranded in the gap between outer barrel member and interior barrel member, even if therefore interior barrel member has been used the metal material that ionization tendency is larger than the ionization tendency of outer barrel member, also can suppress the generation of corrosion.
In foregoing invention, it is characterized in that, form the size of ionization tendency of metal material and the varying in size of the ionization tendency of the metal material of the outer barrel member of formation of base metal housing.
Like this, in the situation that the member consisting of the less metal material of ionization tendency and the member that consists of the larger metal material of ionization tendency are used in to gas sensor, if salt solution is present between two members, the member consisting of the larger metal material of ionization tendency is easier to produce corrosion.Yet, in gas sensor of the present invention, by means of breather filter, salt solution is difficult to be stranded in the gap between base metal housing and outer barrel member, even if therefore base metal housing has been used the metal material that ionization tendency is larger than the ionization tendency of outer barrel member, also can suppress the generation of corrosion.
In foregoing invention, preferably, the rear end of the sensor element is positioned at the position by rear end side than the end face backwards of above-mentioned pressurizing and deformation fastening part, and the top of above-mentioned outer barrel member is configured in the position by tip side than the rear end of the sensor element.
By so making the top of outer barrel member be configured in the rear end of ratio sensor element by the position of tip side, outer barrel member and sensor element part are configured overlappingly, can make gas sensor miniaturization on axis direction.
In addition, even if make the top of outer barrel member near base metal housing, owing to exposing the breather filter that has top and base metal housing to connect in the top of barrel member outside and the gap between base metal housing, so salt solution is also difficult to be stranded in the top and the gap between base metal housing of outer barrel member.
In foregoing invention, preferably, at the engine cylinder that forms above-mentioned internal combustion engine, cover and be provided with above-mentioned exhaust flow path, on aforementioned body metal shell, be provided with for being installed on the installation portion of above-mentioned engine cylinder cover.
By so gas sensor being installed on to engine cylinder cover, thereby compare with the situation that gas sensor is installed on to the gas outlet extending from internal combustion engine, be easy to seek the miniaturization of gas sensor.That is, the engine cylinder at internal combustion engine covers the cooling-parts such as water jacket that are provided with for cooled engine cylinder cap.Compare with the gas outlet that is not provided with this cooling-part, it is lower that the temperature of engine cylinder cover generally becomes., compare with the situation that is installed on gas outlet for this reason, the element that breather filter etc. can be easy to be subject to heat effects near engine cylinder cover be configured, become and be easy to make gas sensor miniaturization on axis direction.In addition, engine cylinder cover is also known as cylinder head sometimes.
Yet, if make gas sensor miniaturization on axis direction, the top of outer barrel member is sometimes near base metal housing, in this case, there is salt solution to be easily stranded in the top of outer barrel member and the gap between base metal housing and then cause the hidden danger of corrosion, but owing to exposing the breather filter that has top and base metal housing to connect in the top of barrel member outside and the gap between base metal housing, therefore salt solution is difficult to be stranded in the top and the gap between base metal housing of outer barrel member, therefore can eliminate this hidden danger.
In foregoing invention, preferably, the top of above-mentioned outer barrel member and above-mentioned breather filter connect.
Conventionally, in the process of assembling gas sensor, by after breather filter being disposed between interior barrel member and outer barrel member, from radially carrying out, pressurizing and deformation is fastening to be fixed, if but now pressurizing and deformation is fastened to about the centre of outer barrel member, float on the top of outer barrel member, sometimes between breather filter and the top of outer barrel member, forms gap.The water capacity is easily introduced into this gap, once water is introduced into and is detained, form larger water droplet, will be stranded in for a long time gap between base metal housing and outer barrel member and near, its result, at least one in base metal housing and outer barrel member likely corrodes.
Therefore, the top of the outer barrel member after fastening with respect to pressurizing and deformation, if via the top and the breather filter close contact that make outer barrel member such as operations such as punchings, the top of outer barrel member and breather filter seamlessly connect, thereby because ground pressure, the contact area of filtrator with respect to base metal housing increases, therefore salt solution become be difficult to be stranded in gap between outer barrel member and base metal housing and near, can suppress the generation of the corrosion of base metal housing, outer barrel member.
According to gas sensor of the present invention, because the end face backwards of the top of breather filter and the pressurizing and deformation fastening part of base metal housing contacts, therefore play salt solution and become and be difficult to be stranded between interior barrel member and outer barrel member and between the pressurizing and deformation fastening part of base metal housing and interior barrel member and the such effect of corrosion of the base metal housing that can suppress to be caused by hydropexis etc.
Accompanying drawing explanation
Fig. 1 is the integrally-built cut-open view of the gas sensor of explanation one embodiment of the present invention.
Fig. 2 is the figure of structure of the gas detecting element of key diagram 1.
Fig. 3 is the exploded stereographic map of the structure of the separator, obstruction component of key diagram 1 and protection urceolus etc.
Fig. 4 is the local amplification view contacting between base metal housing and the filtrator of key diagram 1.
Fig. 5 is the integrally-built cut-open view that gas sensor is in the past described.
Embodiment
The gas sensor of one embodiment of the present invention is described with reference to Fig. 1～Fig. 4.Fig. 1 is the integrally-built cut-open view of the gas sensor 1 of explanation present embodiment.
In the present embodiment, such as the engine cylinder cover with being equipped on the internal combustion engine of the vehicles such as passenger vehicle, be connected and be formed in the exhaust flow path in engine cylinder cover the outstanding sensor that is provided with the head portion of gas sensor, measure and in the lambda sensor of the oxygen concentration in emission gases, apply gas sensor of the present invention and describe.In addition, in the following description, using a side in the direction along axes O, that guard member 60 is installed as tip side, its opposition side is described as rear end side.
The gas sensor 1 of present embodiment is well heater, the so-called heaterless sensor for gas detecting element 10 described later is heated not, and this gas sensor 1 is utilize the heat of emission gases to heat gas detecting element 10 and make its activation and measure the sensor of the oxygen concentration in emission gases.
As shown in Figure 1; gas sensor 1 mainly comprises gas detecting element (sensor element) 10, separator 20, closure member 30, terminal metal shell 40 and goes between 45, and comprises base metal housing 50, protective cover 60, urceolus (interior barrel member) 70 and the protection urceolus (outer barrel member) 80 etc. for covering the surrounding of above-mentioned these members.
Fig. 2 is the figure of structure of the gas detecting element 10 of key diagram 1, and gas detecting element 10 is the members that formed by the solid electrolyte with oxygen-ion conductive.Gas detecting element 10 forms upwardly extending cylindric in axes O side, and this gas detecting element 10 mainly consists of the element body 11 of end 12 sealings by tip side.In the periphery of element body 11, be upwards provided with radially outwards outstanding flange part 13 whole week.In addition, in the present embodiment, although be applied to the example that gas detecting element 10 forms tubular, describe, be not limited to form tubular, also can form tabularly, be not particularly limited.
As the solid electrolyte of composed component main body 11, for example, make Y
2o
3or the ZrO of CaO solid solution
2it is representational solid electrolyte.Except this solid electrolyte, also can be used as oxide and the ZrO of alkaline earth metal or rare earth metal
2between the solid electrolyte of solid solution.In addition, also can be at oxide and the ZrO of alkaline earth metal or rare earth metal
2between solid solution in use and also to contain HfO
2solid electrolyte.
On the outer peripheral face of element body 11, be formed with lateral electrode 14, vertical guidance part 15 and ring-type guidance part 16.Lateral electrode 14 is, in the end 12 of gas detecting element 10, Pt or Pt alloy (are recited as to " Pt etc. " below.) form the electrode of Porous.Vertical guidance part 15 is the conductive parts that extend from lateral electrode 14 on axis direction, is the member being formed by Pt etc.Ring-type guidance part 16 side (below of Fig. 2) below flange part 13 forms ring-type, is mode and the conductive part that vertical guidance part 15 is connected conducting electricity, and is the member being formed by Pt etc.On the inner peripheral surface of element body 11, be formed with the medial electrode 17 that Pt etc. is formed to Porous.
Fig. 3 is the exploded stereographic map of the structure of the separator 20, obstruction component 30 of key diagram 1 and protection urceolus 80 etc., and as shown in figures 1 and 3, separator 20 is the members that are configured between gas detecting element 10 and obstruction component 30.In addition, separator 20 is members of the drum that formed by the material with electrical insulating property, for example aluminium oxide, in the axis centre of separator 20, is formed with for lead-in wire 45 through holes that run through 21.
In the rear end of terminal metal shell 40, on circumferentially, equally spaced arrange and be provided with three flange pieces 41 that extend towards radial outside.In other words, between three flange pieces 41, be formed with the gap of upwards expanding in week.
As shown in Figure 1, base metal housing 50 is the members that formed by iron, and is to form roughly member cylindraceous.On base metal housing 50, from inner peripheral surface towards radially inner side be provided with for supporting the stage portion 51 of the flange part 13 of gas detecting element 10 projecting upwards in whole week.In addition, on the outside surface of base metal housing 50, implement in advance plating Ni, be formed with the Ni coating (not shown) of film.
On the outer peripheral face of the tip side of base metal housing 50, that gas sensor 1 is installed on to the engine cylinder cover of internal combustion engine is (not shown being upwards provided with in whole week.) threaded portion (installation portion) 52 and be used in the hexagonal portion 53 that threaded portion 52 is screwed into the erecting tools engaging of engine cylinder cover.In addition, from the top of base metal housing 50, towards rear end, be arranged in order threaded portion 52, the hexagonal portion 53 of disposing.And, in the rear end side with this base metal housing 50, be in other words provided with cylindrical portion 54 in the adjacent position of the rear end side with hexagonal portion 53.
Urceolus 70 is the members that formed by iron, its insert base metal housing 50 inside and with the rear end side disposed adjacent of ceramic sleeve 66.At urceolus 70, be provided with the air hole 73 that the cylinder portion 71 that forms tubular of extending along axis direction, the flange part 72 of expanding towards radial outside from the tip side of cylinder portion 71 and conduct are formed at the through hole of a portion 71.In addition, on the outside surface of urceolus 70, implement in advance plating Ni, and be formed with the Ni coating (not shown) of film.
The face of the tip side of flange part 72 and ceramic sleeve 66 configure in contact, and on the face of rear end side, dispose the becket 67 consisting of the iron that has been implemented plating Ni.
In addition, in base metal housing 50, in the rear end of cylindrical portion 54, be provided with for urceolus 70 being fixed on to the pressurizing and deformation fastening part 55 of base metal housing 50.Pressurizing and deformation fastening part 55 is the parts that apply power and be out of shape towards radially inner side being the rear end of the cylindrical portion 54 of tubular extension.Becket 67, flange part 72, ceramic sleeve 66, ceramic powders 65 etc. are pressed in pressurizing and deformation fastening part 55 along axis direction to tip side.In addition, pressurizing and deformation fastening part 55 both can and the cylinder portion 71 of urceolus 70 between be formed with gap, also can contact with the cylinder portion 71 of urceolus 70.Gap forms than the thin thickness of urceolus 70 or filtrator 75.In addition, the Ni coating on the pressurizing and deformation fastening part 55 of base metal housing 50 also cracks in the fastening process of pressurizing and deformation sometimes.Now, if water droplet is stranded in this crackle for a long time, base metal housing likely corrodes.
In the periphery of urceolus 70, dispose and for example use PTFE(teflon) form the filtrator with water repellency (breather filter) 75 of tubular.As shown in Figure 1 and Figure 4, the end of the tip side of filtrator 75 upwards contacted with the pressurizing and deformation fastening part 55 of base metal housing 50 in whole week.As shown in Figure 1, configuration is extended to the position identical with the rear end of urceolus 70 in the rear end of filtrator 75.Filtrator 75 is can ventilate but can prevent the member that moisture is invaded.
In addition, as mentioned above, filtrator 75 both can directly contact with the pressurizing and deformation fastening part 55 of base metal housing 50, also can contact with pressurizing and deformation fastening part 55 across other members, in other words, also can directly contact with other members that same pressurizing and deformation fastening part 55 contacts, be not particularly limited.In addition, although preferably on complete cycle, contact, as long as utilize at least a portion to contact.
And, in the above-mentioned filtrator 75 that forms tubular, except in fact forming the filtrator of tubular, also comprise the filtrator 75 that the forms sheet filtrator that circles form of reeling, in other words, also comprise and reel and make the overlapping filtrator of a part.
In the periphery of filtrator 75, dispose and use the stainless steel (for example SUS304L) different from base metal housing 50 to form the roughly protection urceolus 80 of tubular.Protection urceolus 80 be by from outer circumferential side, carry out pressurizing and deformation fastening and and urceolus 70 between sandwich filtrator 75 and keep the member of this filtrator 75.And the rear end of protection urceolus 80 forms littlely with top phase diameter group, in the rear end of protection urceolus 80, embed the rear end that has obstruction component 30.Fastening owing to carrying out pressurizing and deformation from outer circumferential side under this state, therefore protect urceolus 80 obstruction component 30 can be fixed on to the rear end of urceolus 70.
In protection urceolus 80, in position corresponding to air hole 73 with urceolus 70, be provided with the air hole 81 as through hole.Air hole 73 and air hole 81 for make atmosphere with the inside of gas sensor 1, be to make atmosphere be connected and can supply circulation of air with the inner space 18 of medial electrode 17 sides of gas detecting element 10 in detail.
The manufacturing step of the gas sensor 1 of present embodiment then, is described simply.
First, as shown in Figure 1, in being formed at the through hole of base metal housing 50, from rear end side, towards tip side, insert protective cover 60 and gas detecting element 10.Then, in the space between base metal housing 50 and gas detecting element 10, configure ceramic powders 65 and ceramic sleeve 66.
In the rear end side of ceramic sleeve 66, in the mode contacting with flange part 72, configure urceolus 70, on the face of the rear end side of flange part 72, configure becket 67.Under this state, pressurizing and deformation is carried out in the rear end of the cylindrical portion 54 of base metal housing 50 fastening, specifically, from radial outside towards making the rear end plastic yield of cylindrical portion 54 and form pressurizing and deformation fastening part 55 medially.Pressurizing and deformation fastening part 55 presses on ceramic sleeve 66 by means of becket 67 by urceolus 70, and urceolus 70 is fixed on to base metal housing 50.
Afterwards, as shown in Figure 1 and Figure 4, upwards to cover the mode configuration filter 75 of the periphery of urceolus 70 in whole week.Now, the pressurizing and deformation fastening part 55 of the end of the tip side of filtrator 75 and base metal housing 50 leans, and is configured in the boundary upwards covering in whole week between pressurizing and deformation fastening part 55 and the cylinder portion 71 of urceolus 70.
It as shown in Figure 3, makes to go between 45 through the through hole 21 of separator 20, the through hole 31 of obstruction component 30 and protection urceolus 80, at this lead-in wire top fixed terminal metal shell 40 of 45 on the other hand.Below, they are expressed as to composite component 91.
Formed composite component 91 is inserted in urceolus 70, as shown in Figure 1, the top of terminal metal shell 40 is inserted to the inner space 18 of gas detecting element 10, terminal metal shell 40 is contacted with medial electrode 17.Now, terminal metal shell 40 is inserted into flange piece 41 and contacts with the rearward end of gas detecting element 10, and is positioned.
, the tip side of separator 20 and obstruction component 30 is configured in urceolus 70 meanwhile, and presses separator 20, obstruction component 30 and protection urceolus 80 to tip side.And then, to the outer circumferential side embedding protection urceolus 80 of filtrator 75.Now, as shown in Figure 1 and Figure 4, the end of the tip side of protection urceolus 80 is configured in the position near base metal housing 50 than the rear end of gas detecting element 10.And because the pressurizing and deformation fastening part 55 of end autonomous agent metal shell 50 of the tip side of protection urceolus 80 is left, so the end of the tip side of filtrator 75 is exposed between the end and pressurizing and deformation fastening part 55 of tip side of protection urceolus 80.
Afterwards, by from radial outside towards the fastening protection urceolus 80 of inner side pressurizing and deformation, the fixing protection of one urceolus 80 and urceolus 70.In the position except being formed with the position of air hole 73 and air hole 81, carry out pressurizing and deformation fastening.According to more than, complete the explanation to gas sensor 1.
embodiment
Below, with reference to embodiment, specifically describe the present invention.
(sample 1～sample 6)
In the manufacture process of above-mentioned gas sensor 1, make the sample 1～sample 6 that has distributed the gap between filtrator 75 and base metal housing 50 as shown in table 1.
Then, for the gas sensor 1 of sample 1～sample 6, carry out the salt spraytest being as the criterion with Japanese JIS H8502 of 24 hours, evaluate and on base metal housing 50, have rustless generation.The results are shown in table 1.
In addition, evaluation is that each carries out salt spraytest with 10 to each sample, and represents with the ratio of test number (10) with rust generation number.In addition, whether having produced rust is by element map, each sample to be analyzed, and the situation that the iron of base metal housing 50 is disappeared is as the situation that exists rust to produce.
[table 1]
The result of above-mentioned salt spraytest is, the sample 1 that is 0mm on the top from filtrator 75 to the gap base metal housing 50, connects, do not produce rust, on the top from filtrator 75, to there is the sample 2,3 in gap base metal housing 50, produced rust.Thus, top and base metal housing 50 by filtrator 75 connect, thus salt solution be difficult to be stranded in gap and near, known as its result, can suppress the generation of the corrosion of base metal housing 50.
In the present embodiment, being applied in the tip side of the position that is formed with air hole 73 and air hole 81 and these two positions of rear end side carries out the fastening example of pressurizing and deformation and is illustrated.In this case, preferably, the end of tip side of protection urceolus 80 at least extend to the pressurizing and deformation restraint location carrying out in tip side tip side one end or than this pressurizing and deformation restraint location the position near base metal housing 50.
According to the gas sensor 1 of said structure, by means of the top of filtrator 75, salt solution is difficult to be stranded between urceolus 70 and protection urceolus 80 and between the pressurizing and deformation fastening part 55 and urceolus 70 of base metal housing 50.That is, the filtrator 75 that is configured in the outer circumferential side of urceolus 70 and the inner circumferential side of protection urceolus 80 has water repellency, and further to base metal housing 50, gives prominence to configuration than the top of protection urceolus 80.For this reason, by configuration in the gap (gap radially) between inner core 70 and protection urceolus 80, must have the filtrator 75 of water repellency, thereby shipwreck is to be detained.In addition, due to the ground connection configuration that offsets of the top of filtrator 75 and the pressurizing and deformation fastening part 55 of base metal housing 50, therefore water is configured in than the gap between base metal housing 50 and urceolus 70 and leans on the filtrator 75 of radial outside to stop, thereby be difficult to immerse in the gap between base metal housing 50 and urceolus 70, and be difficult to be detained.More particularly, salt solution is difficult to be stranded in the gap between gap, pressurizing and deformation fastening part 55 and the flange part 72 between pressurizing and deformation fastening part 55 and cylinder portion 71.And; due to the filtrator 75 that in top and the gap between base metal housing 50 (gap of axis direction) at protection urceolus 80, exposure has top and base metal housing 50 to connect, thus salt solution be difficult to be stranded in protect the top of urceolus 80 and the gap between base metal housing 50 and near.
Like this; by salt solution, be difficult to be stranded in the gap between gap, base metal housing 50 and the urceolus 70 between urceolus 70 and protection urceolus 80 and protect the gap between urceolus 80 and base metal housing 50, can suppress the generation of the corrosion of base metal housing 50, urceolus 70, protection urceolus 80.
In addition, in the situation that the member consisting of the less metal material of ionization tendency and the member that consists of the larger metal material of ionization tendency are used in to gas sensor, if salt solution is present between two members, the member consisting of the larger metal material of ionization tendency is easy to produce corrosion.But; in gas sensor 1 of the present invention; due to by means of filtrator 75; salt solution is difficult to be stranded in the gap between protection urceolus 80 and urceolus 70; even if therefore urceolus 70 has been used ionization tendency than the large metal material of ionization tendency of protection urceolus 80, also can suppress well the generation of corrosion.Even if similarly base metal housing 50 has been used ionization tendency than the large metal material of ionization tendency of protection urceolus 80, also can suppress well the generation of corrosion.
Top by making to protect urceolus 80 near base metal housing 50, makes to protect urceolus 80 and gas detecting element 10 parts to be configured overlappingly than the rear end of gas detecting element 10, can make gas sensor 1 miniaturization on axis direction.
In addition; even if make to protect the top of urceolus 80 near base metal housing 50; owing to exposing the filtrator 75 that has top and base metal housing 50 to connect in the top at protection urceolus 80 and the gap between base metal housing 50, so salt solution is also difficult to be stranded in the top and the gap between base metal housing 50 of protection urceolus 80.
By gas sensor 1 is installed on to engine cylinder cover, thereby compare with the situation that gas sensor is installed on to the gas outlet extending from internal combustion engine, become and be easy to seek the miniaturization of gas sensor 1.That is, the engine cylinder at internal combustion engine covers the cooling-parts such as water jacket that are provided with for cooled engine cylinder cap.Compare with the gas outlet that is not provided with this cooling-part, it is lower that the temperature of engine cylinder cover generally becomes., compare with the situation that is installed on gas outlet for this reason, filtrator 75 grades can be easy to be subject to the arrangements of components being formed by resin etc. of heat effects near engine cylinder cover, be easy to make gas sensor 1 miniaturization on axis direction.
Yet; if make gas sensor 1 miniaturization on axis direction; protect the top of urceolus 80 sometimes near base metal housing 50; in this case; there is salt solution to be easy to be stranded in the top of protection urceolus 80 and the gap between base metal housing 50 and then cause the hidden danger of corrosion; but owing to exposing the filtrator 75 that has top and base metal housing 50 to connect in the top at protection urceolus 80 and the gap between base metal housing 50, so salt solution is difficult to be stranded in the top and the gap between base metal housing 50 of protection urceolus 80.
In addition; in the present embodiment; although applications exploiting iron form base metal housing 50 with urceolus 70, utilize the ionization tendency stainless steel different with the ionization tendency of iron to form to protect the example of urceolus 80 to be illustrated; but also can utilize stainless steel to form base metal housing 50, urceolus 70 and protection urceolus 80, be not particularly limited.In this case; (for example at ionization tendency, forming situations different between the stainless steel of base metal housing 50 and urceolus 70 and the stainless steel of formation protection urceolus 80; the situation that stainless production code member is different) in; base metal housing 50, urceolus 70 become and are easy to corrosion; but by adopting the structure of present embodiment, can suppress the corrosion of base metal housing 50, urceolus 70.
In addition, preferably, top and the filtrator 75 of protection urceolus 80 connect.
Conventionally; in the process of assembling gas sensor 1; by after filtrator 75 being disposed between urceolus 70 and protection urceolus 80, from radially carrying out, pressurizing and deformation is fastening to be fixed; if but now pressurizing and deformation is fastened to the middle left and right of protecting urceolus 80; protect the top of urceolus 80 to float, sometimes between filtrator 75 and the top of protection urceolus 80, form gap.The water capacity is easily introduced in this gap; once water is introduced into and is detained, form larger water droplet, be stranded in for a long time base metal housing 50 with protect gap between urceolus 80 and near; its result, at least one in base metal housing 50 and protection urceolus 80 likely corrodes.
Therefore; the top of the protection urceolus 80 after fastening with respect to pressurizing and deformation; if via the top and filtrator 75 close contacts that make to protect urceolus 80 such as operations such as punchings; protect top and the filtrator 75 of urceolus 80 seamlessly to connect; thereby because ground pressure, the contact area of filtrator 75 with respect to base metal housing 50 increases; therefore salt solution become be difficult to be stranded in gap between protection urceolus 80 and base metal housing 50 and near, can suppress base metal housing 50, protect the generation of the corrosion of urceolus 80.
description of reference numerals
1 ... gas sensor; 10 ... gas detecting element (sensor element); 50 ... base metal housing; 52 ... threaded portion (installation portion); 55 ... pressurizing and deformation fastening part; 70 ... urceolus (interior barrel member); 71 ... cylinder portion; 72 ... flange part; 75 ... filtrator (breather filter); 80 ... protection urceolus (outer barrel member).
Claims (6)
1. a gas sensor, it is inserted into in the stream of measured gas flow, it is characterized in that, and this gas sensor is provided with:
Sensor element, it extends along axis direction;
Base metal housing, it is for keeping this sensor element;
Interior barrel member, it comprises that the end side with above-mentioned direction of insertion opposition side that is fixed on this base metal housing is rear end side the cylinder portion that forms tubular and the flange part that extends to form to radial outside from the tip side of this portion, and the pressurizing and deformation fastening part that this flange part is arranged at the rear end side of aforementioned body metal shell covers and is fixed;
Outer barrel member, it upwards covers the outside of the cylinder portion of this interior barrel member in whole footpath, and the top of this outer barrel member self is left and formed mutually on axis direction with the end face backwards of above-mentioned pressurizing and deformation fastening part; And
Breather filter, it is clamping and is configured in the tubular between above-mentioned interior barrel member and above-mentioned outer barrel member, and has water repellency;
The top of above-mentioned breather filter barrel member from above-mentioned is outstanding towards axis direction, and the top of above-mentioned breather filter utilizes at least a portion to contact with the above-mentioned end face backwards of the above-mentioned pressurizing and deformation fastening part of aforementioned body metal shell.
2. gas sensor according to claim 1, is characterized in that,
Form the size of ionization tendency of metal material and the varying in size of the ionization tendency of the metal material of the above-mentioned outer barrel member of formation of above-mentioned interior barrel member.
3. gas sensor according to claim 1 and 2, is characterized in that,
Form the size of ionization tendency of metal material and the varying in size of the ionization tendency of the metal material of the above-mentioned outer barrel member of formation of aforementioned body metal shell.
4. according to the gas sensor described in any one in claims 1 to 3, it is characterized in that,
The rear end of the sensor element is positioned at the position by rear end side than the end face backwards of above-mentioned pressurizing and deformation fastening part, and the top of above-mentioned outer barrel member is configured in the position by tip side than the rear end of the sensor element.
5. according to the gas sensor described in any one in claim 1 to 4, it is characterized in that,
At the engine cylinder that forms above-mentioned internal combustion engine, cover and be provided with above-mentioned exhaust flow path,
On aforementioned body metal shell, be provided with for being installed on the installation portion of above-mentioned engine cylinder cover.
6. according to the gas sensor described in any one in claim 1 to 5, it is characterized in that,
The top of above-mentioned outer barrel member and above-mentioned breather filter connect.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-178353 | 2011-08-17 | ||
| JP2011178353 | 2011-08-17 | ||
| PCT/JP2012/005169 WO2013024598A1 (en) | 2011-08-17 | 2012-08-16 | Gas sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103547916A true CN103547916A (en) | 2014-01-29 |
| CN103547916B CN103547916B (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280023949.2A Active CN103547916B (en) | 2011-08-17 | 2012-08-16 | Gas sensor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5841066B2 (en) |
| CN (1) | CN103547916B (en) |
| WO (1) | WO2013024598A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103718034A (en) * | 2011-11-16 | 2014-04-09 | 日本特殊陶业株式会社 | Gas sensor |
| CN109313152A (en) * | 2016-06-23 | 2019-02-05 | 费加罗技研株式会社 | Gas sensor |
| CN110114661A (en) * | 2016-12-20 | 2019-08-09 | 日本特殊陶业株式会社 | Gas sensor |
| CN111656176A (en) * | 2018-01-31 | 2020-09-11 | 日本特殊陶业株式会社 | Gas sensor element and gas sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5916529B2 (en) * | 2012-06-20 | 2016-05-11 | 日本特殊陶業株式会社 | Gas sensor |
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| CN111656176A (en) * | 2018-01-31 | 2020-09-11 | 日本特殊陶业株式会社 | Gas sensor element and gas sensor |
| CN111656176B (en) * | 2018-01-31 | 2022-07-26 | 日本特殊陶业株式会社 | Gas sensor element and gas sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2013024598A1 (en) | 2015-03-05 |
| CN103547916B (en) | 2015-05-20 |
| JP5841066B2 (en) | 2016-01-06 |
| WO2013024598A1 (en) | 2013-02-21 |
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