CN201207043Y - Gas sensor - Google Patents
Gas sensor Download PDFInfo
- Publication number
- CN201207043Y CN201207043Y CNU2008200605555U CN200820060555U CN201207043Y CN 201207043 Y CN201207043 Y CN 201207043Y CN U2008200605555 U CNU2008200605555 U CN U2008200605555U CN 200820060555 U CN200820060555 U CN 200820060555U CN 201207043 Y CN201207043 Y CN 201207043Y
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- sensor
- side lining
- spring
- gas sensor
- lining
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Abstract
The utility model discloses a gas sensor, comprising a short sensor(10), a spring lathe dog(20), and a wiring harness subassembly(30). A plurality pairs of contact springs(33) are arranged inside a protective sleeve(31)of the wiring harness subassembly(30), and each pair of springs(33)are fixed relatively. A sensing element(17)of the short sensor(10) is provided with a contact plate(171) which is arranged between the contact springs(33). The contact plate(171)directly contacts with the contact springs(33). The gas sensor has fewer component parts and is low in making cost and is easy to realize structural miniaturization. Therefore, the gas sensor has great application value.
Description
Technical field
The utility model relates to a kind of internal combustion engine electric parts, is specifically related to a kind of gas sensor.
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.
The motorcycle annual production of China at present surpasses 2,000 ten thousand, and major part still adopts carburetor structure, and its pollution on the environment can not be ignored, and it is imperative that the discharging of motorcycle is controlled.Lambda sensor also is essential as a vital part in the engine management system for the motorcycle management system.Because motorcycle industry is to the susceptibility of price and have that himself is exclusive, develops the tight demand that a lambda sensor becomes market for motorcycle specially.
The utility model content
The technical problems to be solved in the utility model provides a kind of gas sensor, and it can satisfy the miniaturization requirement, and cost is low.
For solving the problems of the technologies described above, the technical solution of the utility model gas sensor is:
Comprise short sensor, spring clip, wire harness assembly;
Short sensor comprises metal sensor seat, ceramic sensing unit at least; Sensing unit places the central authorities of sensor holder;
Wire harness assembly comprises metal protection protector, ceramics springs seat, contact spring at least; Be provided with somely to contact spring in the protective sleeve, contact spring is fixed on the spring base, and every pair of contact spring is fixed relative to one another;
The contact disc of sensing unit bottom places between the described contact spring, and contact disc directly contacts with contact spring, realizes being electrically connected;
The spring clip places in the wire harness assembly, is used for fixing spring base.
The inwall that described sensor holder matches with the reference side lining is provided with and is no less than two salient points, is used for fixing the reference side lining.
The technique effect that the utility model can reach is:
The utility model gas sensor adopts simple machinery assembling to realize connecting between its protective cover and the sensor holder, avoided traditional laser bonding or flanging process, has greatly reduced the installation manufacturing cost.
The utility model 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 utility model gas sensor, 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
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
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 of the utility model gas sensor.
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.
Embodiment
As shown in Figure 8, the utility model gas sensor 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;
Exhaust gas side lining 13 bottoms are provided with seal 14, and seal 14 bottoms are provided with reference side lining 16.
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.
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;
Contact spring 33 can adopt the high temperature resistant stainless steel material, makes as Inconel.
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.
The utility model gas sensor adopts simple machinery assembling to realize connecting between its protective cover 11 and the sensor holder 12, avoided traditional laser bonding or flanging process, has greatly reduced the installation manufacturing cost.
The utility model 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.
The utility model gas sensor, 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.
Claims (9)
1, a kind of gas sensor is characterized in that: comprise short sensor (10), spring clip (20), wire harness assembly (30);
Short sensor (10) comprises metal sensor seat (12), ceramic sensing unit (17) at least; Sensing unit (17) places the central authorities of sensor holder (12);
Wire harness assembly (30) comprises metal protection protector (31), ceramics springs seat (32), contact spring (33) at least; Be provided with somely to contact spring (33) in the protective sleeve (31), contact spring (33) is fixed on the spring base (32), and every pair of contact spring (33) is fixed relative to one another;
The contact disc (171) of sensing unit (17) bottom places between the described contact spring (33), and contact disc (171) directly contacts with contact spring (33), realizes being electrically connected;
Spring clip (20) places in the wire harness assembly (30), is used for fixing spring base (32).
2, gas sensor according to claim 1 is characterized in that: described short sensor (10) also comprises protective cover (11), exhaust gas side lining (13), seal (14), reference side lining (16);
Protective cover (11) is fixed in the top of sensor holder (12);
Be provided with exhaust gas side lining (13), seal (14), reference side lining (16) in the sensor holder (12); Described seal (14) places between exhaust gas side lining (13) and the reference side lining (16) and by exhaust gas side lining (13) and reference side lining (16) and compresses.
3, gas sensor according to claim 2 is characterized in that: described protective cover (11) comprises extension (112), fixed part (113), and protective cover (11) is fixed in the top of sensor holder (12) by fixed part (113);
The external diameter of the fixed part (113) of described protective cover (11) is interference fit greater than extension (112) between fixed part (113) outside surface and sensor holder (12) top inner surface.
4, gas sensor according to claim 2 is characterized in that: the inwall that described sensor holder (12) matches with reference side lining (16) is provided with and is no less than two salient points (1211), is used for fixing reference side lining (16).
5, gas sensor according to claim 2 is characterized in that: described protective cover (11) is provided with umbrella portion (114), and described sensor holder (12) inside surface is provided with the taper surface that matches with umbrella portion (114); Described exhaust gas side lining (13) top is provided with the conical surface that matches with umbrella portion (114);
Exhaust gas side lining (13) is pressed on the umbrella portion (114) of protective cover (11) on the taper surface of sensor holder (12) inside surface.
6, gas sensor according to claim 2 is characterized in that: described seal (14) is for one or more.
7, gas sensor according to claim 1 is characterized in that: described wire harness assembly (30) also comprises lining (34), grommet (35), lead (36);
Described protective sleeve (31) bottom is provided with grommet (35), and the middle part is provided with lining (34), and the lead (36) that an end is connected with described contact spring (33) passes lining (34) and grommet (35), stretches out protective sleeve (31).
8, gas sensor according to claim 1 is characterized in that: described spring clip (20) comprises clip body (21), and clip body (21) periphery is provided with plurality of elastic body (22).
9, gas sensor according to claim 1 is characterized in that: described spring base (32) is provided with projection (321), and assembling back projection (321) closely cooperates with the inside surface of spring clip (20).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNU2008200605555U CN201207043Y (en) | 2008-05-16 | 2008-05-16 | Gas sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CNU2008200605555U CN201207043Y (en) | 2008-05-16 | 2008-05-16 | Gas sensor |
Publications (1)
Publication Number | Publication Date |
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CN201207043Y true CN201207043Y (en) | 2009-03-11 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CNU2008200605555U Expired - Fee Related CN201207043Y (en) | 2008-05-16 | 2008-05-16 | Gas sensor |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101315346B (en) * | 2008-05-16 | 2013-02-06 | 联合汽车电子有限公司 | Gas sensor |
CN103293206A (en) * | 2012-02-29 | 2013-09-11 | 日本特殊陶业株式会社 | Gas sensor |
CN105424886A (en) * | 2015-12-09 | 2016-03-23 | 苏州工业园区传世汽车电子有限公司 | Oxygen sensor for internal combustion engine |
CN109564183A (en) * | 2016-08-01 | 2019-04-02 | 株式会社电装 | Gas sensor |
-
2008
- 2008-05-16 CN CNU2008200605555U patent/CN201207043Y/en not_active Expired - Fee Related
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101315346B (en) * | 2008-05-16 | 2013-02-06 | 联合汽车电子有限公司 | Gas sensor |
CN103293206A (en) * | 2012-02-29 | 2013-09-11 | 日本特殊陶业株式会社 | Gas sensor |
CN103293206B (en) * | 2012-02-29 | 2015-12-09 | 日本特殊陶业株式会社 | Gas sensor |
CN105424886A (en) * | 2015-12-09 | 2016-03-23 | 苏州工业园区传世汽车电子有限公司 | Oxygen sensor for internal combustion engine |
CN105424886B (en) * | 2015-12-09 | 2017-10-13 | 苏州工业园区传世汽车电子有限公司 | Oxygen sensor for internal combustion engine |
CN109564183A (en) * | 2016-08-01 | 2019-04-02 | 株式会社电装 | Gas sensor |
CN109564183B (en) * | 2016-08-01 | 2022-04-01 | 株式会社电装 | Gas sensor |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C17 | Cessation of patent right | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090311 Termination date: 20130516 |