CN1945304A - Impact absorbing structure for gas sensor - Google Patents
Impact absorbing structure for gas sensor Download PDFInfo
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- CN1945304A CN1945304A CN 200610142129 CN200610142129A CN1945304A CN 1945304 A CN1945304 A CN 1945304A CN 200610142129 CN200610142129 CN 200610142129 CN 200610142129 A CN200610142129 A CN 200610142129A CN 1945304 A CN1945304 A CN 1945304A
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- base portion
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- sensing element
- ceramics insulator
- shell
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- 239000012212 insulator Substances 0.000 claims abstract description 127
- 239000000919 ceramic Substances 0.000 claims description 123
- 229910052573 porcelain Inorganic materials 0.000 abstract 5
- 230000000717 retained effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 63
- 238000005452 bending Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000007784 solid electrolyte Substances 0.000 description 3
- 230000002463 transducing effect Effects 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005211 surface analysis Methods 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
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- Measuring Oxygen Concentration In Cells (AREA)
Abstract
A gas sensor includes a sensor element holder, a porcelain insulator, an outer cover disposed on a housing to surround the porcelain insulator, and a sensor element disposed in the housing. The gas sensor also includes outside springs and at least one pair of terminal springs each of which is disposed between the porcelain insulator and the sensor element in abutment with the sensor element. The terminal springs work to form a nip in which a thickness of the sensor element is retained. The outside springs are disposed between the porcelain insulator and the outer cover and have a combined spring constant which is greater than or equal to that of the terminal springs, thereby causing external pressure to be transmitted more to the outside springs than to the terminal springs to suppress vibrations of the porcelain insulator effectively to avoid application of an undesirable impact to the sensor element.
Description
The cross reference of related application
The application number that the application requires on October 4th, 2005 to submit be the application number submitted in 2005-291032 and on May 26th, 2006 be 2006-146671 Japanese patent application formerly right of priority, here their are introduced for your guidance.
Technical field
The present invention relates in general to the gas sensor that is used for engine combustion control in a kind of exhaust system that is installed in internal combustion engine, relate in particular to the improvement structure of gas sensor, be used for the external force of absorption on gas sensor and impacted to prevent sensing element.
Background technology
Figure 11 shows the example of existing sensor, and it is installed in the draw-off composition that is used to measure engine in the exhaust system of car combustion engine (oxygen (O for example
2) or nitrogen oxide (NO
x)) concentration.
This gas sensor comprises sensing element 92, shell 94, the first ceramics insulators (being the ceramics insulator of element one side) 93, the second ceramics insulators (being atmosphere one side ceramics insulator) 95 and air side capping 96.First ceramics insulator 93 remains in the shell 94, and sensing element 92 is installed in first ceramics insulator 93.Second ceramics insulator 95 is around the base portion 921 of sensing element 92.Air side capping 96 is connected to shell 94 and centers on second ceramics insulator 95.
If any one injustice in the opposing end surface of first ceramics insulator 93 and second ceramics insulator 95, and second ceramics insulator 95 is placed on and presses first ceramics insulator 93 on first ceramics insulator 93 so that second ceramics insulator 95 aligns with sensing element 92, then produce the bending stress that acts on the sensing element 92, and can cause its breakage under the even worse situation.Therefore, second ceramics insulator 95 is positioned in first ceramics insulator, 93 tops and leaves air gap, and keeps quick condition in air side capping 96.
But,, as shown in figure 12, then can cause second ceramics insulator 95 laterally to move, thereby make bending stress impose on sensing element 92 by terminal springs 94 if the external force F that is produced by for example mechanical vibration or physical impact is applied on the gas sensor.Especially, one of them terminal springs 94 and another second ceramics insulator 95 will produce unbalanced elastic pressure f, f '.This makes pressure | f-f ' | and act on the base portion 921 of sensing element 92, this can cause the damage of sensing element 92.
For fear of the problems referred to above, Jap.P. open source literature 2004-144732 instruction first uses the spring that is positioned between air side capping (being equivalent to the air side capping 96 among Figure 11) and the ceramics insulator (being equivalent to second ceramics insulator 95) so that the compartment of terrain remains on the ceramic insulation body elasticity in the air side capping.
Ceramics insulator is formed by the complex assemblies of a plurality of parts, therefore makes the overall cost of gas sensor raise.In addition, if big percussive action on gas sensor, may make impact be directly delivered to ceramics insulator from spring, therefore bending stress is applied on the sensing element.
Summary of the invention
Therefore, fundamental purpose of the present invention is to avoid the shortcoming of prior art.
Another object of the present invention provides the improvement structure of gas sensor, is used for the external force of absorption on gas sensor and is impacted to prevent sensing element.
According to an aspect of the present invention, provide a kind of gas sensor, the concentration that it can be installed in the exhaust system of car combustion engine with the selected composition of measuring draw-off is used for the burning control of engine.Described gas sensor comprises: (a) element keeper, and it has top and the cardinal extremity opposite with the top; (b) sensing element, it has the length that comprises detecting means and base portion, and utilize the base portion of the cardinal extremity outside extend to described element keeper and be firmly held in the described element keeper, described detecting means is used to produce the signal of function of the concentration of the selected gas componant of expression; (c) shell of hollow, it has top and the base portion opposite with the top, and described shell remains on described element keeper wherein; (d) ceramics insulator of hollow, its cardinal extremity top that is arranged on described element keeper is with the base portion around described sensing element; (e) outer cover, it is arranged on the base portion of described shell with around described ceramics insulator; (f) at least one pair of terminal springs, each terminal springs is set between the inwall and described sensing element of described ceramics insulator, base portion with the described sensing element of butt, described terminal springs is arranged opposite to each other to form clip, and clip remains on the base portion of described sensing element wherein on thickness direction; And (g) external springs, they are set between described ceramics insulator and the described outer cover, allow to be compressed or to launch in the direction of clip.The cluster spring constant of described external springs is more than or equal to the cluster spring constant of described terminal springs.
When big percussive action is on described gas sensor, will make external springs compression or launch and make ceramics insulator towards or deviate from outer cover and move.Simultaneously, terminal springs is with direction compression or the expansion identical with external springs, thereby generation is applied to the bending stress on the sensing element.But, be distributed on external springs and the terminal springs owing to impact, thereby reduced the impact degree that acts on the sensing element, avoided sensing element that the damage of not expecting takes place.
As mentioned above, the cluster spring constant of external springs is more than or equal to the cluster spring constant of terminal springs, thereby makes the external force that is delivered on the external springs more than the power that is delivered on the terminal springs, thereby suppresses the vibration of ceramics insulator effectively.Owing in terminal springs, do not accumulate big load, therefore avoided sensing element is applied the pressure of not expecting.
In preference pattern of the present invention, gas sensor also can comprise the inboard protection tube that is arranged in the outer cover, and external springs is set between inboard protection tube and the ceramics insulator.
According to a second aspect of the invention, provide a kind of gas sensor, it comprises: (a) element keeper, and it has top and the cardinal extremity opposite with the top; (b) sensing element, it has the length that comprises detecting means and base portion, and utilize the base portion of the cardinal extremity outside extend to described element keeper and be firmly held in the described element keeper, described detecting means is used to produce the signal of function of the concentration of the selected gas componant of expression; (c) shell of hollow, it has top and the base portion opposite with the top, and described shell remains on described element keeper wherein; (d) ceramics insulator of hollow, its cardinal extremity top that is arranged on described element keeper is with the base portion around described sensing element; (e) outer cover, it is arranged on the base portion of described shell with around described ceramics insulator; (f) at least one pair of terminal springs, each terminal springs is set between the base portion of the inwall of described ceramics insulator and described sensing element, base portion with the described sensing element of butt, described terminal springs is arranged opposite to each other to form clip, and clip remains on the base portion of described sensing element wherein on thickness direction; And (g) external springs, they are set between described ceramics insulator and the described outer cover allowing and are compressed or launch in the direction of clip, make the range of described external springs be less than or equal to the range of described terminal springs.
When big percussive action on the described gas sensor and ceramics insulator towards or when deviating from outer cover and moving, to make terminal springs not exclusively compression or expansion, therefore reduced to impact and be applied to degree on the sensing element, the damage of having avoided sensing element to be subjected to not expecting as bending stress.
In preference pattern of the present invention, gas sensor also can comprise the inboard protection tube that is arranged in the outer cover, and external springs is set between inboard protection tube and the ceramics insulator.
The cluster spring constant of external springs is more than or equal to the cluster spring constant of described terminal springs.
According to a third aspect of the invention we, provide a kind of gas sensor, it comprises: (a) the cylindrical sensing element of hollow, and it has the length that comprises detecting means and base portion, and described detecting means is used to produce the signal of function of the concentration of the selected gas componant of expression; (b) shell of hollow, it has top and the base portion opposite with the top, and the shell of described hollow remains on described sensing element wherein, and the base portion of described sensing element extends to outside the base portion of described shell; (c) well heater, it has the length that comprises top and base portion, and described top is set at the inside of described sensing element, and described base portion extends to outside the base portion of described sensing element; (d) ceramics insulator of hollow, its cardinal extremity top that is arranged on described element keeper is with the base portion around described sensing element; (e) outer cover, it is arranged on the base portion of described shell with around described ceramics insulator; (f) at least one pair of terminal springs, each terminal springs are set at the base portion of the described well heater of butt in the described ceramics insulator, so that from the base portion that radially clamps described well heater of described well heater; And (g) external springs, they are set between described ceramics insulator and the described outer cover allowing and are compressed or launch in the clamped direction of the base portion of described well heater.The cluster spring constant of described external springs is more than or equal to the cluster spring constant of described terminal springs.
When big percussive action is on described gas sensor, as described in a first aspect of the present invention, impact being distributed on external springs and the terminal springs, therefore reduced the impact degree that acts on the well heater, the damage of having avoided sensing element to be subjected to not expecting.
In preference pattern of the present invention, gas sensor also can comprise the inboard protection tube that is arranged in the outer cover, and external springs is set between inboard protection tube and the ceramics insulator.
According to a forth aspect of the invention, provide a kind of gas sensor, it comprises: (a) the cylindrical sensing element of hollow, and it has the length that comprises detecting means and base portion, and described detecting means is used to produce the signal of function of the concentration of the selected gas componant of expression; (b) shell of hollow, it has top and the base portion opposite with the top, and the shell of described hollow remains on described sensing element wherein, and the base portion of described sensing element extends to outside the base portion of described shell; (c) well heater, it has the length that comprises top and base portion, and described top is set at the inside of described sensing element, and described base portion extends to outside the base portion of described sensing element; (d) ceramics insulator of hollow, its cardinal extremity top that is arranged on described element keeper is with the base portion around described sensing element; (e) outer cover, it is arranged on the base portion of described shell with around described ceramics insulator; (f) at least one pair of terminal springs, each terminal springs are set at the base portion of the described well heater of butt in the described ceramics insulator, so that from the base portion that radially clamps described well heater of described well heater; And (g) external springs, they are set between described ceramics insulator and the described outer cover and are compressed or launch in the clamped direction of the base portion of described well heater with permission, make the range of described external springs be less than or equal to the range of described terminal springs.
When big percussive action on the described gas sensor and ceramics insulator towards or when deviating from outer cover and moving, to make terminal springs not exclusively compression or expansion, therefore reduced to impact and be applied to degree on the sensing element, the damage of having avoided sensing element to be subjected to not expecting as bending stress.
In preference pattern of the present invention, gas sensor also can comprise the inboard protection tube that is arranged in the outer cover, and external springs is set between inboard protection tube and the ceramics insulator.
The cluster spring constant of external springs is more than or equal to the cluster spring constant of described terminal springs.
Description of drawings
According to the accompanying drawing of following detailed and the preferred embodiments of the present invention, the present invention is readily appreciated that, but specific embodiment is not intended to limit the invention, and just is used for explaining and understanding, in these accompanying drawings:
Fig. 1 is the longitudinal section that the gas sensor of first embodiment of the invention is shown;
Fig. 2 is the cross-sectional view of being got along the straight line A-A among Fig. 1;
Fig. 3 is the synoptic diagram that the pressure that is produced by external springs and terminal springs among Fig. 2 is shown;
Fig. 4 is the local vertically synoptic diagram that the pressure that is produced by external springs and terminal springs is shown;
Fig. 5 is the local vertically synoptic diagram of the stroke range of external springs and terminal springs in the expression second embodiment of the present invention;
Fig. 6 is the local longitdinal cross-section diagram of the motion of expression when second ceramics insulator is subjected to big physical impact;
Fig. 7 (a) and 7 (c) represent to be in respectively the terminal springs under the steady state (SS) and the longitdinal cross-section diagram of external springs;
Fig. 7 (b) and 7 (d) represent to be in respectively the terminal springs under the complete compressive state and the longitdinal cross-section diagram of external springs;
Fig. 8 is the longitudinal section that the gas sensor of third embodiment of the invention is shown;
Fig. 9 is the longitudinal section that the gas sensor of fourth embodiment of the invention is shown;
Figure 10 is the cross-sectional view of being got along the straight line B-B among Fig. 9;
Figure 11 is the longitudinal section of the existing gas sensor of expression;
Figure 12 is the local longitdinal cross-section diagram of the motion of expression when atmosphere one side ceramics insulator is subjected to physical impact.
Embodiment
With reference to the accompanying drawings, wherein identical Reference numeral is represented identical parts in a plurality of views, particularly, the gas sensor 1 of first embodiment of the invention has been shown among Fig. 1, this sensor is designed to be installed in the automobile burning control system, and the composition that is used for detecting the discharge gas that is included in internal combustion engine is NO for example
x, CO, HC or O
2Concentration.
As shown in Figure 2, second ceramics insulator 5 is elastically mounted in the hollow cylindrical keeper 13, and keeper 13 has the notch that is roughly the C tee section.Keeper 13 is by the inwall of annulus gap in the face of air side capping 6, and wherein external springs 12 is arranged in this annulus gap.External springs 12 is the tongue pieces that extend to the diagonal angle, outer from keeper 13, thus they flexibly the inwall of butt air side capping 6 produce the spring pressure that imposes on keeper 13 in opposite direction.
As mentioned above, sensing element 2 is by utilizing aluminium oxide (Al
2O
3) or zirconia (ZrO
2) potsherd of the lamination made forms, assembled on it and be used to the well heater (not shown) that produces the sensing unit (not shown) of output and be used for the temperature of sensing unit is remained on expectation value, the output that is produced is included in the O in the combustion gas of car combustion engine for example
2Or nitrogen oxide (NO
x) the function of concentration.
Sensing element 2 is positioned in first ceramics insulator 3.The middle part that first ceramics insulator 3 keeps sensing element 2 hermetically by glass seal 141, and first ceramics insulator 3 remains in the shell 4 hermetically by grommet type seals 142.Shell 4 has openend (promptly, upper end as shown in Figure 1), it has ruffle so that utilize annular disc spring 143 to force first ceramics insulator 3 flexibly to press the interior shoulder of shell 4 by O-ring seal 142, thereby sets up sealing between first ceramics insulator 3 and shell 4.
As mentioned above, the cap assemblies 144 of protectiveness is connected to the end of shell 4 to cover the transducing part of sensing element 2.The cap assemblies 144 of protectiveness is formed with the gas access thereon, and forms a gas chamber, and the transducing part of sensing element 2 is exposed to the gas that enters from the gas access in this chamber.
As shown in Figure 2, four terminal springs 11 that are positioned in second ceramics insulator, 5 inside are electrically connected with the lead 145 that the outside that extends to gas sensor 1 arrives sensor external controller (not shown).Wherein two terminal springs 11 are electrically connected with the lead-out terminal of the sensing unit of sensing element 2.In addition two terminal springs 11 be attached to the lip-deep power supply terminal of sensing unit and electrically contact so that to the heater supplies electric energy.
Each terminal springs 11 is made by C shape sheet metal, and it comprises backboard portion 111, preceding board 112, and the bend 113 that connects between backboard portion 111 and preceding board 112.Backboard portion 111 is placed with the inwall of butt second ceramics insulator 5, and preceding board 112 is placed with elasticity butt sensing element 2.
Shown in Fig. 3 and 4, terminal springs 11 and external springs 12 quilts are geometry location like this, that is, and and the feasible pressure f that produces by each terminal springs 11
1With the pressure f that produces by each external springs 12
2Towards identical direction, that is, and towards the thickness direction of sensing element 2.Should be noted that: in order to simplify description, Fig. 3 and Fig. 4 have omitted terminal springs 11 and external springs 12, and only show the arrow of representative by the pressure of terminal springs 11 and external springs 12 generations.
The architectural feature of gas sensor 1 will be described below.
As mentioned above, external springs 12 is positioned between second ceramics insulator 5 and the air side capping 6 so that second ceramics insulator, 5 compartment of terrains are remained in the air side capping 6, thereby suppresses the vibration of second ceramics insulator 5 when gas sensor 1 is subjected to outside physical impact.In other words, external springs 12 and terminal springs 11 are used for being sent to sensing element 2 by the impact that 5 minimizings of second ceramics insulator act on the gas sensor 1.
Especially when external force acts on the gas sensor 1, will make external springs 12 compress circularly or launch, thereby make second ceramics insulator 5 towards air side capping 6 or deviate from air side capping 6 and move.The direction of vibration of terminal springs 11 is identical with the direction of vibration of external springs 12.This makes bending stress be applied on the sensing element 2 by terminal springs 11.But external force is distributed on all external springs 12 and the terminal springs 11 and is absorbed, thereby has suppressed the vibration of second ceramics insulator 5, has reduced the crooked pressure that acts on the sensing element 2, feasible physical damage minimum to it.
As mentioned above, the cluster spring constant k 2 of external springs 12 is more than or equal to the cluster spring constant k of terminal springs 11
1, therefore act on impact on the gas sensor 1 be sent on the external springs 12 than being sent to many on the terminal springs 11.This makes that to be accumulated in the pressure that the pressure ratio in the terminal springs 11 is accumulated in the external springs 12 little, thereby has reduced to act on the degree of pressure on the sensing element 2.In other words, external springs 12 is used to reduce the vibration of second ceramics insulator 5, thereby reduces to act on impact degree on the sensing element 2 by terminal springs 11.
For example, when the horizontal displacement Δ L of second ceramics insulator 5, the pressure F2 that acts on second ceramics insulator 5 that is produced by external springs 12 is represented by formula F 2=k2 * Δ L.Being applied to four pressure F1 on the terminal springs 11 is represented by formula F 1=k1 * Δ L.Because k1≤k2 draws F1≤F2.Therefore, external force imposes on external springs 12 more, thereby has reduced to impose on the degree of pressure of sensing element 2.
Fig. 5 to 7 (d) shows the gas sensor 1 of second embodiment of the invention, and it is designed like this, the selected range s1 that is less than or equal to each terminal springs 11 of the range s2 of each external springs 12.
To shown in 7 (b), each terminal springs 11 and external springs 12 have the compression quantitative limitation as Fig. 7 (a).Fig. 7 (a) and 7 (c) shown be in steady state (SS) terminal springs 11 and external springs 12.Fig. 7 (b) and 7 (d) have shown terminal springs 11 and the external springs 12 that is in complete compressive state (promptly being in range s1 and s2).
Fig. 5 and 6 has shown when the thickness of the backboard portion 111 of the terminal springs of being compressed fully 11 and thickness between the preceding board 112 (being the gap) and external springs 12 is omitted, when promptly being defined as zero (0), the steady state (SS) of terminal springs 11 and external springs 12 and compressive state help analyzing the acting force of terminal springs 11 and external springs 12 like this.As shown in Figure 5, when not having external force to act on the gas sensor 1, between the surface of sensing element 2 and the inwall of second ceramics insulator 5 is the range s1 of the preceding board 112 of each terminal springs 11 at interval.Similarly, be the range s2 of each external springs 12 at interval between the inwall of the surface of second ceramics insulator 5 and air side capping 6.In the reality, range s1 and s2 are littler than range s1 shown in Figure 5 and s2 respectively, their difference is not the backboard portion 111 of terminal springs 11 and the thickness of interval between the preceding board 112 and external springs 12, is for following poor between surface analysis range s1 and the s2 but use above-mentioned qualification.
The range s2 of external springs 12 is selected to be less than or equal to the range s1 (s2≤s1) of terminal springs 11.Therefore, when as shown in Figure 6, when external force acted on the gas sensor 1, second ceramics insulator 5 was range s2 of external springs 12 towards the maximum amount of movement of air side capping 6.If especially big percussive action is on gas sensor 1, the amount that second ceramics insulator 5 moves is not more than the range s2 of external springs 12, has therefore reduced to send to by second ceramics insulator 5 impact degree of sensing element 2.
For example, when second ceramics insulator 5 was mobile fully as shown in Figure 6, the pressure F1max that acts on the sensing element that is produced by terminal springs 11 was represented by formula F 1max=k1 * s2.Therefore, pressure F1max depends on range s2.Find that not having the big pressure of any specific pressure F1max is applied on the sensing element 2.
If s2＞s1, the big impact that sensing element 1 is applied will make second ceramics insulator 5 further from two terminal springs 11 launch fully and in addition the position compressed fully of two terminal springs 11 move, thereby make the pressure that acts on the sensing element 2 surpass the spring pressure of terminal springs 11, this can cause physical damage.
The structure of the gas sensor 1 of present embodiment designs like this: promptly, when big percussive action on gas sensor 1 and second ceramics insulator 5 when moving to air side capping 6 fully, the terminal springs 11 between second ceramics insulator 5 and the sensing element 2 is not exclusively launched or compression and being in allows them to be moved further position apart from s1-s2.This has reduced to be sent to impact degree on the sensing element 2 by second ceramics insulator 5.
Similar with first embodiment, the cluster spring constant k 2 of external springs 12 can be configured to the cluster spring constant more than or equal to terminal springs 11.
Fig. 8 shows the gas sensor 1 of third embodiment of the invention, and it has the inboard protection tube 61 that is placed in the air side capping 6.
The external springs 12 of hollow cylindrical keeper 13 is positioned between second ceramics insulator 5 and the inboard protection tube 61, protects the inwall of tube 61 to connect with the inboard.
When the stone that is for example flown here hits; air side capping 6 allows to deform in the air cavity 62 that is defined between air side capping 6 and the inboard protection tube 61; therefore stop the transmission of impacting to external springs 12 by inboard protection tube 61, guaranteed the range s2 of external springs 12.This has set up between aforesaid pressure F1 and the F2 and the relation between range s1 and the s2.
Terminal springs 11 among above-mentioned each embodiment and external springs 12 can be selected to be made of the spring or the cushion pad of volute spring or other form.
Fig. 9 and 10 shows the gas sensor of fourth embodiment of the invention, and it is equipped with cup-shaped sensing element 20.
As shown in Figure 9, sensing element 20 comprises solid electrolyte body and a pair of outside surface of solid electrolyte body and the electrode (not shown) on the inside surface of being attached to that has base portion.Sensing element 20 is maintained at shell 4 inside.At the sensing element 20 inner well heaters 22 of installing, be used for sensing element 20 is heated to the triggering temperature of expectation.Well heater 22 has the outside base portion 221 of cardinal extremity (being the upper end among Fig. 9) that extends to shell 4.Well heater 22 cylindrical ceramic well heaters made of aluminum are realized.
Settle the gas one side ceramics insulator 50 that aligns with it on the cardinal extremity of shell 4, ceramics insulator 50 covers the base portion 221 of well heater 22.
As shown in figure 10, pair of terminal spring 11 is positioned in the inboard also each other along the diameter opposed of gas one side ceramics insulator 50.The inwall of terminal springs 11 elasticity butt gases one side ceramics insulator 50 and the base portion 221 of well heater 22 are firmly held in wherein clip to form with well heater 22.
Well heater 22 is formed with terminal 222 on base portion 221, it is connected to heating element, utilizes described terminal, and terminal springs 11 is placed with to contact between lead 146 and well heater 22 to set up electric current leads to.
External springs 12 is positioned between gas one side ceramics insulator 50 and the air side capping 6 so that produce the spring pressure identical with the spring pressure direction of terminal springs 11.The cluster spring constant of external springs 12 is more than or equal to the cluster spring constant of terminal springs 11.Other structure is basically the same as those in the first embodiment.
The structure of the gas sensor 1 of present embodiment is based on the principle identical with first embodiment and reduces from the physical impact of air side capping 6 outsides to the transmission of well heater 22 so that destroy minimum.This has also protected sensing element 2 to avoid impacting to be avoided the damage of sensing element 2 by well heater 22.
Based on principle same as described above, the range s1 that the range s2 of outside terminal 12 can selectedly be less than or equal to terminal springs 11 avoids acting on external force on the gas sensor 1 with protection well heater 22 and sensing element 2.
Although the present invention is open to help understanding better the present invention, to be to be understood that not breaking away under the situation of spirit of the present invention by preferred embodiment, the present invention can comprise various ways.Therefore, the present invention is interpreted as can comprising the modification of all possible embodiment and illustrated embodiment under the situation that does not break away from the illustrated principle of claim.
Claims (10)
1. gas sensor, it comprises:
The element keeper, it has top and the cardinal extremity opposite with the top;
Sensing element, it has the length that comprises detecting means and base portion, and utilize the base portion of the cardinal extremity outside extend to described element keeper and be firmly held in the described element keeper, described detecting means is used to produce the signal of function of the concentration of the selected gas componant of expression;
The shell of hollow, it has top and the base portion opposite with the top, and described shell remains on described element keeper wherein;
The ceramics insulator of hollow, its cardinal extremity top that is arranged on described element keeper is with the base portion around described sensing element;
Outer cover, it is arranged on the base portion of described shell with around described ceramics insulator;
At least one pair of terminal springs, each terminal springs is set between the inwall and described sensing element of described ceramics insulator, base portion with the described sensing element of butt, described terminal springs is arranged opposite to each other to form clip, and clip remains on the base portion of described sensing element wherein on thickness direction; And
External springs, they are set between described ceramics insulator and the described outer cover, allow to be compressed or to launch in the direction of clip, and the cluster spring constant of described external springs is more than or equal to the cluster spring constant of described terminal springs.
2. gas sensor according to claim 1 also comprises: be arranged on the inboard protection tube in the described outer cover, and described external springs is set between described inboard protection tube and the described ceramics insulator.
3. gas sensor, it comprises:
The element keeper, it has top and the cardinal extremity opposite with the top;
Sensing element, it has the length that comprises detecting means and base portion, and utilize the base portion of the cardinal extremity outside extend to described element keeper and be firmly held in the described element keeper, described detecting means is used to produce the signal of function of the concentration of the selected gas componant of expression;
The shell of hollow, it has top and the base portion opposite with the top, and described shell remains on described element keeper wherein;
The ceramics insulator of hollow, its cardinal extremity top that is arranged on described element keeper is with the base portion around described sensing element;
Outer cover, it is arranged on the base portion of described shell with around described ceramics insulator;
At least one pair of terminal springs, each terminal springs is set between the base portion of the inwall of described ceramics insulator and described sensing element, base portion with the described sensing element of butt, described terminal springs is arranged opposite to each other to form clip, and clip remains on the base portion of described sensing element wherein on thickness direction; And
External springs, they are set between described ceramics insulator and the described outer cover and are compressed or launch with the direction of permission at clip, make the range of described external springs be less than or equal to the range of described terminal springs.
4. gas sensor according to claim 3 also comprises: be arranged on the inboard protection tube in the described outer cover, and described external springs is set between described inboard protection tube and the described ceramics insulator.
5. gas sensor according to claim 3 is characterized in that, the cluster spring constant of described external springs is more than or equal to the cluster spring constant of described terminal springs.
6. gas sensor, it comprises:
The cylindrical sensing element of hollow, it has the length that comprises detecting means and base portion, and described detecting means is used to produce the signal of function of the concentration of the selected gas componant of expression;
The shell of hollow, it has top and the base portion opposite with the top, and the shell of described hollow remains on described sensing element wherein, and the base portion of described sensing element extends to outside the base portion of described shell;
Well heater, it has the length that comprises top and base portion, and described top is set at the inside of described sensing element, and described base portion extends to outside the base portion of described sensing element;
The ceramics insulator of hollow, its cardinal extremity top that is arranged on described element keeper is with the base portion around described sensing element;
Outer cover, it is arranged on the base portion of described shell with around described ceramics insulator;
At least one pair of terminal springs, each terminal springs are set at the base portion of the described well heater of butt in the described ceramics insulator, so that from the base portion that radially clamps described well heater of described well heater; And
External springs, they are set between described ceramics insulator and the described outer cover and are compressed or launch in the clamped direction of the base portion of described well heater with permission, and the cluster spring constant of described external springs is more than or equal to the cluster spring constant of described terminal springs.
7. gas sensor according to claim 6 also comprises: be arranged on the inboard protection tube in the described outer cover, and described external springs is set between described inboard protection tube and the described ceramics insulator.
8. gas sensor, it comprises:
The cylindrical sensing element of hollow, it has the length that comprises detecting means and base portion, and described detecting means is used to produce the signal of function of the concentration of the selected gas componant of expression;
The shell of hollow, it has top and the base portion opposite with the top, and the shell of described hollow remains on described sensing element wherein, and the base portion of described sensing element extends to outside the base portion of described shell;
Well heater, it has the length that comprises top and base portion, and described top is set at the inside of described sensing element, and described base portion extends to outside the base portion of described sensing element;
The ceramics insulator of hollow, its cardinal extremity top that is arranged on described element keeper is with the base portion around described sensing element;
Outer cover, it is arranged on the base portion of described shell with around described ceramics insulator;
At least one pair of terminal springs, each terminal springs are set at the base portion of the described well heater of butt in the described ceramics insulator, so that from the base portion that radially clamps described well heater of described well heater; And
External springs, they are set between described ceramics insulator and the described outer cover and are compressed or launch in the clamped direction of the base portion of described well heater with permission, make the range of described external springs be less than or equal to the range of described terminal springs.
9. gas sensor according to claim 8 also comprises: be arranged on the inboard protection tube in the described outer cover, and described external springs is set between described inboard protection tube and the described ceramics insulator.
10. gas sensor according to claim 8 is characterized in that, the cluster spring constant of described external springs is more than or equal to the cluster spring constant of described terminal springs.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP291032/2005 | 2005-10-04 | ||
| JP2005291032 | 2005-10-04 | ||
| JP146671/2006 | 2006-05-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1945304A true CN1945304A (en) | 2007-04-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610142129 Pending CN1945304A (en) | 2005-10-04 | 2006-10-08 | Impact absorbing structure for gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1945304A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102317766A (en) * | 2010-01-19 | 2012-01-11 | 日本碍子株式会社 | Gas sensor and manufacturing method thereof |
| CN101713758B (en) * | 2009-12-29 | 2012-10-24 | 冯江涛 | Method and structure for packaging oxygen sensor |
| CN101216452B (en) * | 2007-12-28 | 2013-02-06 | 联合汽车电子有限公司 | Oxygen sensor |
-
2006
- 2006-10-08 CN CN 200610142129 patent/CN1945304A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216452B (en) * | 2007-12-28 | 2013-02-06 | 联合汽车电子有限公司 | Oxygen sensor |
| CN101713758B (en) * | 2009-12-29 | 2012-10-24 | 冯江涛 | Method and structure for packaging oxygen sensor |
| CN102317766A (en) * | 2010-01-19 | 2012-01-11 | 日本碍子株式会社 | Gas sensor and manufacturing method thereof |
| CN102317766B (en) * | 2010-01-19 | 2014-06-18 | 日本碍子株式会社 | Gas sensor and manufacturing method thereof |
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