CN101320011A - Production method of gas transducer - Google Patents
Production method of gas transducer Download PDFInfo
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- CN101320011A CN101320011A CNA200810043391XA CN200810043391A CN101320011A CN 101320011 A CN101320011 A CN 101320011A CN A200810043391X A CNA200810043391X A CN A200810043391XA CN 200810043391 A CN200810043391 A CN 200810043391A CN 101320011 A CN101320011 A CN 101320011A
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Abstract
The invention discloses a manufacturing method of a gas sensor. The gas sensor is made with the following steps: the first step is to respectively assemble a short sensor (10) and a wiring harness component (30); the second step is to fit the short sensor (10) to a spring caliper (20); the third step is to connect the spring base (32) of the wiring harness component (30) with the spring caliper (20) and arrange the sensing element (17) of the short sensor (10) on the wiring harness component (30); the forth step is to connect the wiring harness component (30) with the short sensor (10); the fifth step is to fix the wiring harness component (30) on the short sensor (10). The manufacturing method successfully solves the connecting problem of a ceramic sensing element with a metal terminal. The solving proposal is provided with great cost advantage. The gas sensor made through the invention has the advantages of fewer parts, lower installing and manufacturing cost, easy realization of size structure miniaturization and great application value.
Description
Technical field
The present invention relates to the manufacture method of a kind of internal combustion engine, be specifically related to a kind of manufacture method of gas sensor with electric parts.
Background technology
Gas sensor is a vitals in the engine management system as lambda sensor, and it is installed in the exhaust system of internal combustion engine, is used for perception waste gas concentration of oxygen, realizes the emission control to pollutant.Lambda sensor is installed in the engine's exhaust system, and working environment is more abominable, and temperature of being born in the lifetime and mechanical stress be all than higher, and therefore, reliable and stable Machine Design becomes the key that can the design of lambda sensor successful.
Existing Nernst galvanic cell type lambda sensor need provide the reference cavity of a standard at interior electrode, is generally atmosphere.The partial pressure of oxygen of the canonical reference gas in the reference cavity must remain unanimity, for atmosphere, to guarantee exactly the atmosphere cleaning and can with fresh air generation gas exchange, otherwise, will cause the signal bias of sensor.Way commonly used is with this reference cavity sealing, and is wired to cleaner zone, realizes and extraneous gas exchange by expanding with heat and contract with cold of gas.Form an annular seal space at sensor internal, must solve the sealing problem of annular seal space and waste gas.Way commonly used is to adopt resistant to elevated temperatures Inorganic Non-metallic Materials, and by certain structure with its compacting, thereby realize sealing.As shown in Figure 1, be applied to the axial force on the protective sleeve 251, can pass to high temperature sealing material 254 by ceramic chamber lining 252.Compacted encapsulant 254 can prevent effectively that exhaust gas leakage from arriving annular seal space.In order to guarantee the validity of sealing, must guarantee that the encapsulant 254 of lambda sensor can both guarantee sealing in lifetime.Therefore, after the axial force that is applied is cancelled, must guarantee that also encapsulant 254 still is in compressive state.Generally certain groove is set at sensor holder 253 outside surfaces; by riveting protective sleeve 251; form projection at protective sleeve 251 inside surfaces; realization is fixed on protective sleeve 251 on the sensor holder 253; thereby guarantee that compacted encapsulant 254 can not fluff, satisfy the interior requirement of lifetime sealing.
The cover 251 yet this way of realization needs protection, and in order to guarantee that encapsulant 254 all is in compressive state in lifetime, to the control more complicated of the riveting technology of protective sleeve 251, to the dimension precision requirement of sensor holder 253 also than higher.
Need at high temperature work owing to be used for the ceramic body of perception oxygen concentration in the lambda sensor, how to be connected to become the problem that must solve in the design process of lambda sensor reliably realizing between refractory ceramics and the metal terminal.
US Patent specification US006082175A (open day on July 4th, 2000) discloses a kind of gas sensor, and as shown in Figure 2, refractory ceramics 150 is realized electric and mechanical connection by metal terminal 153 and lead 152.Electrode 151 on the refractory ceramics 150 is realized being connected with metal terminal 153, and two ceramic members 154 that have groove can cover metal terminal 153, thereby realizes metal terminal 153 and fixture 155 insulation.Fixture 155 has a U type structure, two ceramic members 154 can be clamped.Metal terminal 153 is when electrode 151 on the refractory ceramics 150 is connected, the oral area that needs to adopt special tooling will have the fixture 155 of U type structure struts, make two ceramic members 154 can separate certain distance each other, could smoothly the electrode on the refractory ceramics 150 151 be placed between the metal terminal 153 then, after finishing above-mentioned action, make special tooling withdraw from the oral area of fixture 155, fixture 155 is with two ceramic members 154 interlinear notes firmly, be fixed in two metal terminals 153 on the ceramic member 154 and be pressed in tightly on the electrode 151 of refractory ceramics 150, realize electric and mechanical connection.
The gas sensor of this structure is installed manufacturing cost on the one hand than higher, and part is many on the other hand, can't realize the miniaturization of dimensional structure.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of manufacture method of gas sensor, can satisfy the miniaturization requirement of sensor with the gas sensor of manufacturing of the present invention, and cost is low.
For solving the problems of the technologies described above, the technical solution of the manufacture method of gas sensor of the present invention is:
Adopt following steps to make gas sensor:
The first step, assemble short sensor and wire harness assembly respectively;
Second goes on foot, short sensor is press fit over the spring clip; The spring base of wire harness assembly is taken out from protective sleeve, place frock; Aid is inserted between the contact spring;
The spring base and the spring clip of the 3rd step, rat tail assembly; And the sensing unit of short sensor is assembled on the wire harness assembly;
A, with the inboard that the sensing of short sensor unit inserts aid, make that the contact disc of sensing unit is corresponding with the contact portion of contact spring;
B, aid is withdrawed from between the contact spring, contact spring is directly contacted with the contact disc of sensing unit;
The 4th step, rat tail assembly and short sensor;
The 5th step, fixed beam assembly and short sensor.
The technique effect that the present invention can reach is:
1, the present invention separates contact spring by aid, therefore can not destroy the contact disc of sensing unit in assembling process, can guarantee the accuracy of the signal that sensing unit is transmitted.
2, the present invention places aid between the contact spring earlier, and then sensing unit is inserted, and need not the edging to sensing unit, and this assembly method can thoroughly solve the problem of corner breakage in the assembling process, can save the manufacturing cost of sensing unit.
The present invention has solved the connectivity problem of ceramic sensing unit and metal terminal well, and this solution has great cost advantage.
The present invention processes a plurality of salient points by riveting or other method on sensor holder and inwall that the reference side lining matches, the reference side lining is fixed in the sensor holder, and can prevent that seal from losing sealing effectiveness because of resilience takes place, and solved the sealing problem of gas sensor well.
The gas sensor of manufacturing of the present invention, on the one hand part is fewer, and it is lower that manufacturing cost is installed on the other hand, and be easy to realize the miniaturization of dimensional structure, has great using value.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 is the structural representation of prior art lambda sensor;
The structural representation of Fig. 2 prior art gas sensor;
Fig. 3 is the structural representation of short sensor;
Fig. 4 is the cut-open view of short sensor;
Fig. 5 is the structural representation of wire harness assembly;
Fig. 6 is the synoptic diagram of the wire harness assembly after spring base is taken out from protective sleeve;
Fig. 7 is the synoptic diagram of spring clip;
Fig. 8 is the structural representation with the gas sensor of manufacturing of the present invention;
Fig. 9 is the synoptic diagram that the sensing unit insertion contact spring of aid will be housed;
Figure 10 extracts the synoptic diagram that behind the aid contact spring and the contact disc of sensing unit is directly contacted out;
Figure 11 is the process flow diagram of the manufacture method of gas sensor of the present invention.
Among the figure, 150 refractory ceramicss, 151 electrodes, 152 leads; 153 metal terminals, 154 ceramic members, 155 fixtures, 251 protective sleeves; 252 ceramic chamber linings, 253 sensor holders, 254 encapsulants, 10 short sensors; 20 spring clips, 30 wire harness assemblies, 11 protective covers; 111 through holes, 112 extensions, 113 fixed parts; 114 umbrella portions, 12 sensor holders, 13 exhaust gas side linings; 14 seals, 16 reference side linings, 17 sensing units; 171 contact discs, 121 first mating surfaces; 122 second mating surfaces, 1211 salient points; 21 clip bodies, 22 elastic bodys, 31 protective sleeves; 32 spring bases, 321 projectioies, 33 contact springs; 34 linings, 35 grommets, 36 leads; protective sleeve after 40 assemblings are finished, 50 aids, 60 frocks.
Embodiment
As shown in Figure 8, the gas sensor of manufacturing of the present invention comprises short sensor 10, spring clip 20, wire harness assembly 30;
As shown in Figure 3, Figure 4, short sensor 10 comprises protective cover 11, metal sensor seat 12, exhaust gas side lining 13, seal 14, reference side lining 16, ceramic sensing unit 17;
Protective cover 11 comprises extension 112, fixed part 113, umbrella portion 114, and the external diameter of fixed part 113 is interference fit greater than extension 112 between fixed part 113 outside surfaces and sensor holder 12 top inner surface.
Protective cover 11 is fixed in the top of sensor holder 12 by fixed part 113, and the extension 112 of protective cover 11 stretches out from the top of sensor holder 12, and extension 112 is provided with some through holes 111.Because the external diameter of extension 112 less than fixed part 113, therefore in assembling process, can stretch out sensor holder 12 with protective cover 11 at an easy rate.
Sensor holder 12 inside surfaces are provided with the taper surface that matches with umbrella portion 114; Described exhaust gas side lining 13 tops are provided with the conical surface that matches with umbrella portion 114.
Umbrella portion 114 with protective cover 11 is pressed on the taper surface of sensor holder 12 inside surfaces by exhaust gas side lining 13, can make protective cover 11 and sensor holder 12 further fixing.
Exhaust gas side lining 13 bottoms are provided with seal 14, and seal 14 bottoms are provided with reference side lining 16.
Sensor holder 12 outside surfaces are provided with first mating surface 121, second mating surface, 122, the first mating surfaces 121 closely cooperate with the inside surface of spring clip 20, are used for fixing spring clip 20; Second mating surface 122 closely cooperates with the inside surface of the protective sleeve 31 of wire harness assembly 30, and sensor holder 12 is fixedlyed connected with protective sleeve 31.
The inwall that sensor holder 12 matches with reference side lining 16 is provided with a plurality of salient points 1211, and salient point 1211 can be fixed in the sensor holder 12 reference side lining 16, and can prevent that seal 14 from losing sealing effectiveness because of resilience takes place.Salient point 1211 is generally three to six.
Seal 14 adopts elastic powdery high temperature sealing material to make; For the enhanced leaktightness effect, can adopt a plurality of seals 14, embodiment shown in Figure 4 has adopted three seals 14.
As Fig. 5, shown in Figure 6, wire harness assembly 30 comprises metal protection protector 31, ceramics springs seat 32, contact spring 33, lining 34, grommet 35, lead 36;
Be provided with somely to contact spring 33 in the protective sleeve 31, contact spring 33 1 ends are fixed on the spring base 32, and the other end is connected with an end of lead 36; Every pair of contact spring 33 is fixed relative to one another, is used for fixing sensing unit 17; The bottom of sensing unit 17 is provided with contact disc 171, and contact disc 171 places between the contact spring 33, and the contact disc 171 of sensing unit 17 directly contacts with contact spring 33;
As shown in Figure 7, spring clip 20 comprises clip body 21, and clip body 21 peripheries are provided with plurality of elastic body 22, and clip body 21 is fixed in the inwall of protective sleeve 31 by elastic body 22.
As shown in Figure 8, spring clip 20 places in the wire harness assembly 30, and the sensor holder 12 of short sensor 10 is by closely cooperating between the inside surface of the protective sleeve 31 of second mating surface 122 and wire harness assembly 30, makes between short sensor 10 and the wire harness assembly 30 to fixedly connected; First mating surface 121 of sensor holder 12 closely cooperates with clip body 21 inside surfaces of spring clip 20, and spring clip 20 is fixedlyed connected with the sensor holder 12 of short sensor 10.
As shown in figure 11, the manufacture method of gas sensor of the present invention is:
1, assembling short sensor 10;
1.1, protective cover 11 is inserted sensor holder 12 from the bottom of sensor holder 12, make its extension 112 stretch out sensor holder 12, and its fixed part 113 and sensor holder 12 top inner surface be connected;
1.2, respectively reference side lining 16, seal 14, exhaust gas side lining 13 are placed in the sensing unit 17;
1.3, the sensing unit 17 that assembles is inserted in the sensor holder 12 from the bottom of sensor holder 12, make exhaust gas side lining 13 press the umbrella portion 114 of protective cover 11, thereby make protective cover 11 and sensor holder 12 further fixing;
1.4, the bottom surface of reference side lining 16 is applied size is 2 tons axial force (scope can at 2 ± 0.5 tons), makes seal 14 become compaction state by rarefaction, makes seal 14 play sealing function;
Adopt this method to handle seal 14, can make seal 14 play good sealing effectiveness, and need not to adopt the protective sleeve of riveting complex process, simplified the structure of gas sensor, reduced the dimension precision requirement of sensor.
1.5, keeping under the condition of axial force, on sensor holder 12 and inwall that reference side lining 16 matches, process a plurality of salient points 1211 by riveting or other method, reference side lining 16 is fixed in the sensor holder 12;
2, the assembly line tread assembly 30;
3, the spring base 32 with wire harness assembly 30 takes out from protective sleeve 31;
Promote lead 36, the spring base 32 of wire harness assembly 30 and the contact spring 33 that is attached thereto are released from protective sleeve 31, place frock 60;
4, short sensor 10 is press fit over spring clip 20;
The inside surface of spring clip 20 is press fit on first mating surface 121 of sensor holder 12, spring clip 20 is fixed on the sensor holder 12 of short sensor 10;
5, aid 50 is inserted between the contact spring 33, make contact spring 33 separately;
6, the sensing unit 17 with short sensor 10 is assembled on the wire harness assembly 30;
6.1, as shown in Figure 9, the inboard with the sensing of short sensor 10 unit 17 inserts aids 50 makes that the contact disc 171 of sensing unit 17 is corresponding with the contact portion of contact spring 33;
6.2, aid 50 is withdrawed between contact spring 33, as shown in figure 10, contact spring 33 is directly contacted with the contact disc 171 of sensing unit 17.
Because sensing unit 17 works in hot environment, for generating oxide layer on the surface of contact of avoiding sensing unit 17 and contact spring 33, cause contact resistance to change, make the output voltage generation deviation of sensor, the distorted signals that causes sensing unit 17 to be transmitted, must closely contact between the contact disc 171 that requires sensing unit 17 and the contact spring 33, make contact spring 33 can produce enough big contact force at contact disc 171.
Assembly method commonly used is directly sensing unit 17 to be inserted between the contact spring 33 to be electrically connected with realization, adopt this assembly method, on the one hand, because the contact force that contact spring 33 is provided is excessive, when the contact disc 171 of sensing unit 17 slides between contact spring 33, cause the damage of surface in contact on the contact disc 171 easily, influence the accuracy of the signal that sensing unit 17 transmitted.Therefore the present invention by aid 50 with contact spring 33 separately can not destroy the contact disc 171 of sensing unit 17, can guarantee the accuracy of the signal that sensing unit 17 is transmitted.
On the other hand, sensing unit 17 itself is a kind of hard and crisp stupalith, and contact spring 33 is generally refractory metal.The manufacturing technical feature of sensing unit 17 has determined after under normal circumstances sensing unit 17 creates it all is straight stupefied straight flange.When inserting sensing unit 17 between the contact spring 33, easily the straight flange of sensing unit 17 is inserted out fragment.Not only influence assembling also can produce harmful effect to the performance of sensing unit 17.For this reason, traditional way is to adopt diamond abrasive tool that straight flange is erased, yet because the singularity of sensing unit 17 itself, this edging technology can greatly increase the manufacturing cost of sensing unit.
The present invention places aid 50 between the contact spring 33 earlier, and then sensing unit 17 is inserted, and need not 17 edgings to sensing unit, and this assembly method can thoroughly solve the problem of corner breakage in the assembling process, can save the manufacturing cost of sensing unit 17.
7, the spring base 32 and spring clip 20 of rat tail assembly 30;
The spring clip 20 that has been assembled together with short sensor 10 spring base 32 with wire harness assembly 30 is press fit over, make the projection 321 of spring base 32 and spring clip 20 realize wringing fits;
8, rat tail assembly 30 and short sensor 10;
Push wire harness assembly 30 to short sensor 10, the inside surface of its protective sleeve 31 and second mating surface 122 of sensor holder 12 are press-fitted, thereby wire harness assembly 30 is connected with short sensor 10;
9, fixed beam assembly 30 and short sensor 10;
10, further processing line tread assembly 30;
The protective sleeve 31 of processing line tread assembly 30 diminishes the lower outer diameter of protective sleeve 31 ccontaining grommets 35, forms the shape of the protective sleeve 40 after assembling shown in Figure 8 is finished.
Because the spring base 32 that needs to be connected with lead 36 in assembling process is released, and therefore is provided with the gap between grommet 35 and the lead 36 in assembling process, so that the release of spring base 32; And the assembling finish after, for guaranteeing the sealing property of sensor, the lower outer diameter that makes protective sleeve 31 be used for ccontaining grommet 35 diminishes, and can eliminate the gap between grommet 35 and the lead 36.
The present invention has solved the connectivity problem of ceramic sensing unit 17 and metal terminal contact spring 33 well, and this solution has great cost advantage.
The present invention processes a plurality of salient points 1211 by riveting or other method on sensor holder 12 and inwall that reference side lining 16 matches, reference side lining 16 is fixed in the sensor holder 12, and can prevent that seal 14 from losing sealing effectiveness because of resilience takes place, and solved the sealing problem of gas sensor well.
Claims (5)
1, a kind of manufacture method of gas sensor is characterized in that: adopt following steps to make gas sensor:
The first step, assemble short sensor (10) and wire harness assembly (30) respectively;
Second goes on foot, short sensor (10) is press fit over spring clip (20); The spring base (32) of wire harness assembly (30) is taken out from protective sleeve (31), place frock (60); Aid (50) is inserted between the contact spring (33);
The spring base (32) and the spring clip (20) of the 3rd step, rat tail assembly (30); And the sensing unit (17) of short sensor (10) is assembled on the wire harness assembly (30);
A, with the inboard that the sensing unit (17) of short sensor (10) inserts aid (50), make that the contact disc (171) of sensing unit (17) is corresponding with the contact portion of contact spring (33);
B, aid (50) is withdrawed between contact spring (33), contact spring (33) is directly contacted with the contact disc (171) of sensing unit (17);
The 4th step, rat tail assembly (30) and short sensor (10);
The 5th step, fixed beam assembly (30) and short sensor (10).
2, the manufacture method of gas sensor according to claim 1 is characterized in that: the step of described first step assembling short sensor (10) is:
A, protective cover (11) is inserted sensor holder (12) from the bottom of sensor holder (12), make its extension (112) stretch out sensor holder (12), and its fixed part (113) and sensor holder (12) top inner surface are connected;
B, respectively reference side lining (16), seal (14), exhaust gas side lining (13) are placed in the sensing unit (17);
C, the sensing unit (17) that assembles is inserted in the sensor holder (12) from the bottom of sensor holder (12), make exhaust gas side lining (13) press the umbrella portion (114) of protective cover (11);
D, the bottom surface of reference side lining (16) is applied axial force, make seal (14) become compaction state, make seal (14) play sealing function by rarefaction.
3, the manufacture method of gas sensor according to claim 2, it is characterized in that: under the condition that keeps described axial force, on sensor holder (12) and inwall that reference side lining (16) matches, process salient point (1211) by riveting, reference side lining (16) is fixed in the sensor holder (12).
4, according to the manufacture method of claim 2 or 3 described gas sensors, it is characterized in that: the axial force size in the described d step is 2 ± 0.5 tons.
5, the manufacture method of gas sensor according to claim 1 is characterized in that: further again processing line tread assembly (30) after described the 5th step; The lower outer diameter of the ccontaining grommet of protective sleeve (31) (35) of wire harness assembly (30) is diminished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810043391XA CN101320011B (en) | 2008-05-22 | 2008-05-22 | Production method of gas transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810043391XA CN101320011B (en) | 2008-05-22 | 2008-05-22 | Production method of gas transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101320011A true CN101320011A (en) | 2008-12-10 |
| CN101320011B CN101320011B (en) | 2012-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810043391XA Active CN101320011B (en) | 2008-05-22 | 2008-05-22 | Production method of gas transducer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102576002A (en) * | 2009-10-13 | 2012-07-11 | 日本碍子株式会社 | Contact member for a gas sensor, gas sensor, restraint member, method for connecting a contact member with a sensor element in a gas sensor, and method for manufacturing a gas sensor |
| CN103620397A (en) * | 2011-07-04 | 2014-03-05 | 日本碍子株式会社 | Method for assembling gas sensor, device for assembling gas sensor, method for annularly mounting member to be annularly mounted, and method for annularly mounting cylindrical body |
-
2008
- 2008-05-22 CN CN200810043391XA patent/CN101320011B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102576002A (en) * | 2009-10-13 | 2012-07-11 | 日本碍子株式会社 | Contact member for a gas sensor, gas sensor, restraint member, method for connecting a contact member with a sensor element in a gas sensor, and method for manufacturing a gas sensor |
| CN102576002B (en) * | 2009-10-13 | 2014-07-09 | 日本碍子株式会社 | Contact member for a gas sensor, gas sensor, restraint member, method for connecting a contact member with a sensor element in a gas sensor, and method for manufacturing a gas sensor |
| CN103620397A (en) * | 2011-07-04 | 2014-03-05 | 日本碍子株式会社 | Method for assembling gas sensor, device for assembling gas sensor, method for annularly mounting member to be annularly mounted, and method for annularly mounting cylindrical body |
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| Publication number | Publication date |
|---|---|
| CN101320011B (en) | 2012-11-21 |
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