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KR20130056524A - Gas sensor for automotive exhaust system - Google Patents

Gas sensor for automotive exhaust system Download PDF

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Publication number
KR20130056524A
KR20130056524A KR1020110122168A KR20110122168A KR20130056524A KR 20130056524 A KR20130056524 A KR 20130056524A KR 1020110122168 A KR1020110122168 A KR 1020110122168A KR 20110122168 A KR20110122168 A KR 20110122168A KR 20130056524 A KR20130056524 A KR 20130056524A
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KR
South Korea
Prior art keywords
outer housing
housing
insulating
circumferential surface
exhaust system
Prior art date
Application number
KR1020110122168A
Other languages
Korean (ko)
Inventor
김규준
서호철
조용준
김태완
이창근
Original Assignee
세종공업 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 세종공업 주식회사 filed Critical 세종공업 주식회사
Priority to KR1020110122168A priority Critical patent/KR20130056524A/en
Publication of KR20130056524A publication Critical patent/KR20130056524A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • 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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electrochemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)

Abstract

The present invention relates to a gas sensor for a vehicle exhaust system, and more particularly, to a gas sensor for a vehicle exhaust system that can effectively implement the process simplification and cost reduction.
Gas sensor for vehicle exhaust system according to the present invention, the outer housing; A gas introduction cover provided at one end of the outer housing; An insulating housing installed inside the outer housing; And a sensor element installed in the lengthwise direction of the insulating housing, wherein the outer housing has a first outer housing having a gas introduction cover coupled to one end thereof, and a second outer housing having one end coupled to the other end of the first outer housing; A third outer housing having one end coupled to the other end of the second outer housing, the insulating housing having a first insulating portion at one side and a second insulating portion at the other side, and an outer diameter of the first insulating portion being an outer diameter of the second insulating portion; It is formed to be smaller, the outer diameter of the first insulating portion is characterized in that the interference fit to the inner diameter surface of the first outer housing.

Description

Gas sensor for vehicle exhaust system {GAS SENSOR FOR AUTOMOTIVE EXHAUST SYSTEM}

The present invention relates to a gas sensor for a vehicle exhaust system, and more particularly, to a gas sensor for a vehicle exhaust system that can effectively implement the process simplification and cost reduction.

As is well known, a gas sensor is a kind of measuring instrument for accurately measuring the pressure, temperature, concentration, flow rate, flow rate, and the like of a gas.

Such a gas sensor is mainly installed in the flow path or valve side through which gas passes in an automobile, a chemical facility, a semiconductor manufacturing process, and the like, and is mainly used to accurately measure the pressure, temperature, concentration, flow rate, and flow rate of gas.

A gas sensor for a vehicle exhaust system exposed to a high temperature exhaust environment such as a vehicle exhaust system is composed of a gas introduction cover, a sensor element, a housing for supporting the sensor element, and the like.

The gas sensor for a vehicle exhaust system should be hermetically sealed to prevent gas, moisture, and other foreign substances introduced through the gas introduction cover from being leaked to the outside by the sensor element or the housing when exposed to a high temperature exhaust environment.

On the other hand, the housing of the gas sensor for a conventional vehicle exhaust system is composed of a metal outer housing and an insulating housing of a ceramic material coupled to the inside of the outer housing, the outer housing and the insulating housing is sealed as they are bonded to each other by an adhesive Bonding (gas sealing) and adhesion between the two materials are achieved. In particular, between the outer housing of the metal material and the insulating housing of the ceramic material, the outer housing and the insulating housing are bonded as the high temperature ceramic adhesive and the metal adhesive are laminated and applied.

As such, the conventional gas sensor for a vehicle exhaust system has a disadvantage in that the assembling process is difficult due to a narrow bonding space as a separate bonding process is required to bond the outer housing and the insulating housing. There was a disadvantage that the manufacturing cost is increased due to the application of the adhesive.

The present invention has been made in view of the above, it does not require the bonding process when the coupling between the outer housing and the insulating housing to provide a gas sensor for a vehicle exhaust system that can simplify the manufacturing process and reduce cost Its purpose is to.

Gas sensor for vehicle exhaust system according to the present invention for achieving the above object,

Outer housing;

A gas introduction cover provided at one end of the outer housing;

An insulating housing installed inside the outer housing; And

And a sensor element installed in the lengthwise direction in the insulating housing.

The outer housing has a first outer housing having a gas introduction cover coupled to one end, a second outer housing having one end coupled to the other end of the first outer housing, and a third outer housing having one end coupled to the other end of the second outer housing. Has,

One end outer circumferential surface of the insulating housing is forcibly fitted to the inner circumferential surface of the first outer housing, and the interference fit tolerance between one outer circumferential surface of the insulating housing and the inner circumferential surface of the first outer housing is 0.1 to 3 mm.

The chambers may be formed at corner portions where the inner surface of the first outer housing and the outer surface of the insulating housing are in contact with each other.

The inner diameter of the second outer housing is formed larger than the outer diameter of the first outer housing, the outer peripheral surface of the other end of the first outer housing is inserted into one end of the inner peripheral surface of the second outer housing and fitted, and the second outer housing of the second outer housing An annular stopper portion protrudes in an inner diameter direction on one side of the inner circumferential surface, and the other end surface of the first outer housing is caught by the stopper portion of the second outer housing to restrict the insertion position thereof.

An annular stopper portion protrudes in an outer diameter direction on an outer circumferential surface adjacent to one end of the first outer housing, a mounting member is movably installed on an outer circumferential surface of the first outer housing, and a threaded portion is formed on one outer circumferential surface of the mounting member. A fitting groove is formed at the other end of the mounting member, and one end of the mounting member is caught by the stopper portion of the first outer housing to restrict its upper position, and the fitting groove of the mounting member is formed in the second outer housing. It is characterized in that it is caught on one side and its lower position is regulated.

The other end of the second outer housing is formed with a stepped portion recessed in the inner diameter direction, one end inner peripheral surface of the third outer housing is fitted to the stepped side, and the other end of the third outer housing is sealingly sealed. It is characterized by being combined.

According to the present invention, since the bonding process between the outer housing and the insulating housing is not required by forcibly fitting the outer peripheral surface of the insulating housing to the inner diameter surface of the first outer housing of the outer housing, the manufacturing process can be simplified and the cost can be reduced. There is an advantage.

In addition, the present invention by forming the chamber portion in the corner portion where the first outer housing of the outer housing and the outer peripheral surface of the insulating housing are in contact with each other, the shock generated during the interference fit between the one outer peripheral surface of the insulating housing in the first outer housing There is an advantage that can be minimized to minimize the damage or breakage.

1 is a cross-sectional view showing a gas sensor for a vehicle exhaust system according to an embodiment of the present invention.
2 is an exploded cross-sectional view of a gas sensor for a vehicle exhaust system according to the present invention.
3 is a view showing a state in which the gas sensor for a vehicle exhaust system according to the present invention is mounted on the exhaust pipe side of the vehicle exhaust system.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 are views illustrating a gas sensor for a vehicle exhaust system according to an embodiment of the present invention.

As shown, the gas sensor for a vehicle exhaust system according to the present invention is the outer housing 10, the gas introduction cover 20 provided at one end of the outer housing 10, the insulating housing installed inside the outer housing 10 (15), and a sensor element (5) installed in the longitudinal direction on the insulating housing (15) side.

The outer housing 10 is configured such that the first outer housing 11, the second outer housing 12, and the third outer housing 13 are assembled in the longitudinal direction.

The first outer housing 11 has a gas introduction cover 20 coupled to one end thereof, and one end of the second outer housing 12 is coupled to the other end of the first outer housing 11. An annular stopper portion 11b protrudes in the outer diameter direction on an outer circumferential surface adjacent to one end of the first outer housing 11, and a mounting member 14 is movably fitted on the outer circumferential surface 11a of the first outer housing 11. Lose.

A threaded portion 14a is formed at one outer circumferential surface of the mounting member 14, and the threaded portion 14a of the mounting member 14 is fastened and mounted to a vehicle exhaust system side such as an exhaust pipe 1 as illustrated in FIG. 3. One end of the mounting member 14 is hooked to the stopper portion 11b side of the first outer housing 11 to restrict its upper position, and the fitting end 14a is formed at the other end of the mounting member 14. The mounting member 14 is restricted in its lower position as the fitting groove 14a is caught by one end surface of the second outer housing 12. That is, the mounting member 14 may be restricted in position within a predetermined range on the outer circumferential surface of the first outer housing 11.

One end of the second outer housing 12 is coupled to the other end side of the first outer housing 11, and one end of the third outer housing 13 is coupled to the other end side of the second outer housing 12. That is, the second outer housing 12 serves as a connector for connecting the first and third outer housings 11 and 13 in the longitudinal direction.

The inner diameter of the second outer housing 12 is larger than the outer diameter of the first outer housing 11, and the outer peripheral surface of the other end of the first outer housing 11 is inserted into one end of the second outer housing 12. Combined. An annular stopper portion 12a protrudes in an inner diameter direction on one side of the inner circumferential surface of the second outer housing 12, so that the other end surface of the first outer housing 11 is a stopper portion of the second outer housing 12. 12a), the insertion position is restricted.

The other end of the second outer housing 12 is formed by recessing the stepped portion 12b in the inner diameter direction, and the inner peripheral surface of one end of the third outer housing 13 is fitted to the stepped portion 12b side.

As the other end outer circumferential surface of the first outer housing 11 is inserted into one inner circumferential surface of the second outer housing 12, the outer circumferential surface of the second outer housing 12 protrudes from the outer circumferential surface of the first outer housing 11, and the second One end surface of the outer housing 12 is located higher than the other end surface of the first outer housing 11. Thus, the fitting groove 14b of the mounting member 14 is fitted to the outer peripheral surface side of one end of the second outer housing 12. Accordingly, the mounting member 14 may be prevented from being separated from the lower side of the first outer housing 11, and thereby the position of the mounting member 14 may be regulated within a predetermined range.

One end of the third outer housing 13 is fitted to the stepped portion 12b side of the second outer housing 12, and the sealing member 17 is sealingly coupled to the other end of the third outer housing 13. A tapered portion 13a is formed at one end surface of the third outer housing 13.

The gas introduction cover 20 is coupled to one end of the first outer housing 11 and is radially spaced apart from the inner side of the inner cover 21 and the inner cover 21 surrounding one side of the sensor element 5. It consists of 22. Each of the inner cover 21 and the outer cover 22 is provided with a plurality of introduction holes 21a and 22a, and is configured to introduce gas through the introduction holes 21a and 22a.

An expansion portion 21b is formed at the lower end of the inner cover 21, and the expansion portion 21b is fitted to one end of the first outer housing 11. An extended portion 22b is formed at the lower end of the outer cover 22, and the extended portion 22b of the outer cover 22 is fitted to the outer circumferential surface of the extended portion 21b of the inner cover 21.

The outer circumferential surface of one end 15a of the insulating housing 15 is forcibly fitted into the first outer housing 11 of the outer housing 10, and in particular, the outer circumferential surface of the one end 15a of the insulating housing 15 and the first outer housing 11. The tolerance fit between the inner circumferential surface of the) is characterized in that 0.1 ~ 3mm.

One end 15a of the insulating housing 15 is press-fitted to the inner circumferential surface of the first outer housing 11 through a press to effectively implement a hermetic sealing coupling between the insulating housing 15 and the first outer housing 11. Can be.

Meanwhile, as illustrated in FIGS. 1 to 3, the insulating housing 15 has a first insulating portion 15a and an outer housing 10 which are forcibly fitted into the first outer housing 11 of the outer housing 10. The second insulating portion 15b accommodated in the second and third outer housings 12 and 13 may be formed.

The outer diameter of the first insulating portion 15a is formed smaller than the outer diameter of the second insulating portion 15b, and the outer circumferential surface 15f of the first insulating portion 15a is formed on the inner circumferential surface 11f of the first outer housing 11. It is combined by force. In particular, as the outer diameter of the first insulating portion 15a is formed to be slightly larger than the inner diameter of the first outer housing 11, the interference fit can be made firm.

Meanwhile, the chamber portions 15c and 11c are formed to correspond to each other at corner portions where the first insulating portion 15a and the first outer housing 11 of the insulating housing 15 contact each other, and the first insulating portion 15a. At the time of interference fit, there is an advantage in that the shock is prevented by the chamber parts 15c and 11c to prevent damage.

Specifically, a stepped boundary surface 11d is formed at one side of the inner diameter of the first outer housing 11, and the stepped boundary surface 11d and the inner circumferential surface 11f of the first outer housing 11 are formed. The chamber part 11c is formed in the edge part which meets. The first insulating portion 15a of the insulating housing 15 has a chamber portion 15c formed at an outer edge thereof, and the chamber portion 15c and the first outer housing 11 of the first insulating portion 15a are formed. The chamber portion 11c is formed such that its inclination angle and the like correspond to each other.

The sensor element 5 is installed in the insulating housing 15 in the longitudinal direction, one side of the sensor element 5 is adjacent to the gas introduction cover 20 side, the remaining portion of the sensor element 15 is insulated housing 15 It is installed in). Under the sensor element 15, a plurality of terminals 16 are electrically connected in the insulating housing 15, and the plurality of terminals 16 are held on the sealing member 17 side.

According to the present invention as described above, the outer housing 10 and the insulating housing by forcibly fitting the first insulating portion 15a of the insulating housing 15 to the inner diameter surface of the first outer housing 11 of the outer housing 10. Since the bonding process between the (15) is not required, there is an advantage that can simplify the manufacturing process and reduce the cost.

In addition, according to the present invention, the chamber portions 11c and 15c are formed at corners at which the first outer housing 11 of the outer housing 10 and the first insulating portion 15a of the insulating housing 15 contact each other. There is an advantage that the damage or breakage can be minimized by mitigating the shock that occurs during the interference between the first insulating portion 15a in the first outer housing 11.

5: sensor element 10: outer housing
11: first outer housing 12: second outer housing
13: Third outer housing 15: Insulated housing
20: gas introduction cover

Claims (5)

Outer housing;
A gas introduction cover provided at one end of the outer housing;
An insulating housing installed inside the outer housing; And
And a sensor element installed in the lengthwise direction in the insulating housing.
The outer housing has a first outer housing having a gas introduction cover coupled to one end, a second outer housing having one end coupled to the other end of the first outer housing, and a third outer housing having one end coupled to the other end of the second outer housing. Has,
One end outer circumferential surface of the insulating housing is forcibly fitted to the inner circumferential surface of the first outer housing, the interference fit between the one outer peripheral surface of the insulating housing and the inner circumferential surface of the first outer housing is 0.1 ~ 3mm Gas sensor. The method according to claim 1,
The gas sensor for a vehicle exhaust system, characterized in that the chamber portion is formed at each corner portion where the inner surface of the first outer housing and the outer surface of the insulating housing contact each other. The method according to claim 1,
The inner diameter of the second outer housing is formed larger than the outer diameter of the first outer housing, the outer peripheral surface of the other end of the first outer housing is inserted into one end of the inner peripheral surface of the second outer housing and fitted, and the second outer housing of the second outer housing An annular stopper portion protrudes in the inner diameter direction on one side of the inner circumferential surface, and the other end surface of the first outer housing is caught by the stopper portion of the second outer housing to restrict the insertion position thereof. The method according to claim 1,
An annular stopper portion protrudes in an outer diameter direction on an outer circumferential surface adjacent to one end of the first outer housing, a mounting member is movably installed on an outer circumferential surface of the first outer housing, and a threaded portion is formed on one outer circumferential surface of the mounting member. A fitting groove is formed at the other end of the mounting member, and one end of the mounting member is caught by the stopper portion of the first outer housing to restrict its upper position, and the fitting groove of the mounting member is formed in the second outer housing. A gas sensor for a vehicle exhaust system, characterized in that one end is caught and its lower position is regulated. The method according to claim 1,
The other end of the second outer housing is formed with a stepped portion recessed in the inner diameter direction, one end inner peripheral surface of the third outer housing is fitted to the stepped side, and the other end of the third outer housing is sealingly sealed. Gas sensor for vehicle exhaust system, characterized in that coupled.
KR1020110122168A 2011-11-22 2011-11-22 Gas sensor for automotive exhaust system KR20130056524A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110122168A KR20130056524A (en) 2011-11-22 2011-11-22 Gas sensor for automotive exhaust system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110122168A KR20130056524A (en) 2011-11-22 2011-11-22 Gas sensor for automotive exhaust system

Publications (1)

Publication Number Publication Date
KR20130056524A true KR20130056524A (en) 2013-05-30

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Application Number Title Priority Date Filing Date
KR1020110122168A KR20130056524A (en) 2011-11-22 2011-11-22 Gas sensor for automotive exhaust system

Country Status (1)

Country Link
KR (1) KR20130056524A (en)

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