KR101678778B1 - Terminal for gas sensor - Google Patents

Terminal for gas sensor Download PDF

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Publication number
KR101678778B1
KR101678778B1 KR1020150057789A KR20150057789A KR101678778B1 KR 101678778 B1 KR101678778 B1 KR 101678778B1 KR 1020150057789 A KR1020150057789 A KR 1020150057789A KR 20150057789 A KR20150057789 A KR 20150057789A KR 101678778 B1 KR101678778 B1 KR 101678778B1
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South Korea
Prior art keywords
terminal
sensor element
pressing portion
sensor
terminal body
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KR1020150057789A
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Korean (ko)
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KR20160126570A (en
Inventor
이대건
고양주
김정택
박헌준
정윤기
조성은
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주식회사 현대케피코
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Priority to KR1020150057789A priority Critical patent/KR101678778B1/en
Publication of KR20160126570A publication Critical patent/KR20160126570A/en
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Publication of KR101678778B1 publication Critical patent/KR101678778B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/0015—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using exhaust gas sensors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/10—Sockets for co-operation with pins or blades
    • H01R13/11—Resilient sockets
    • H01R13/113—Resilient sockets co-operating with pins or blades having a rectangular transverse section

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

Abstract

The present invention relates to a gas sensor terminal, and more particularly, to a gas sensor terminal that is grounded with a sensor element of a gas sensor to transmit and receive an electrical signal, the gas sensor terminal comprising: a terminal body; Wherein the pressing portion includes a bent portion formed by bending the other end from one end of the terminal body, a first pressing portion extending from the bent portion in a direction away from the terminal body, And a grounding portion formed at a position where the first pressing portion and the second pressing portion meet and contacting the electrode surface of the sensor element, And a first inclined portion formed to be inclined in a direction approaching the terminal body, Is formed at one end portion at least one inclined terminal to the terminal of the gas sensor capable of preventing the ceramic decomposition occurring is in contact with the portions other than the electrode of the sensor element.

Description

[0001] TERMINAL FOR GAS SENSOR [0002]

The present invention relates to a gas sensor terminal, and more particularly, to a gas sensor terminal capable of accurately and stably measuring the concentration of a gas in an exhaust gas of an automobile by preventing performance deterioration of a gas sensor used in an automobile or the like.

Generally, a vehicle mounts a gas sensor to operate the engine at an optimum air-fuel ratio. The gas sensor measures the concentration of the gas contained in the exhaust gas and transmits the result to the ECU.
The ECU feeds back the signal of the gas sensor and uses it as a basic signal for ignition timing and fuel injection amount correction.
That is, the gas sensor is installed in an exhaust line of a vehicle, etc., and determines the air-fuel ratio of the exhaust gas and transmits it to the ECU to correct the amount of air or fuel supplied to the engine. Thereby maintaining the optimum air-fuel ratio.
One of the key components of such a gas sensor is a sensor element. Generally, one side of the sensor element is formed with a contact surface contacting the exhaust gas, and the other side is formed with an electrode surface in contact with the atmospheric gas.
A gas sensor terminal is connected to the electrode surface to transmit the electromotive force generated in the gas element to the ECU according to the air-fuel ratio of the gas passing through the exhaust line of the vehicle.
Such a gas sensor terminal is preferably made of a conductive material such as SUS so that electromotive force can be transmitted to the ECU, and is preferably made elastic like a leaf spring, and the sensor element is made of a ceramic material.
The sensor element may be provided with an electrode surface contacting the gas sensor terminal. The gas sensor terminal may be pressed against the electrode surface of the sensor element by being pressed when the sensor element is grounded.
At this time, if the gas sensor terminal is brought into contact with a portion other than the electrode of the sensor element and the frequency of contact becomes frequent or the contact time becomes long, the sensor element may be disassembled by the ceramic, and stability may be deteriorated.

US Patent Application Publication No. 2008-0295576 'GAS SENSOR HAVING INSULATOR ASSEMBLY FOR SUPPORTING HEATER' (disclosed on December 04, 2008)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gas sensor terminal capable of preventing ceramic decomposition caused by contact of a terminal other than an electrode of a sensor element with at least one inclined portion formed at one end of a terminal body.

According to an aspect of the present invention, there is provided a gas sensor terminal including a terminal body and a pressing portion bent and extended in the other direction from one end of the terminal body, The pressing portion includes a bent portion formed by bending the other end of the terminal body in the other direction, a first pressing portion extending from the bent portion in a direction away from the terminal body, a second pressing portion extending from the first pressing portion to the terminal A second pressing portion extending in a direction approaching the body and a ground portion formed at a position where the first pressing portion and the second pressing portion meet and contacting the electrode surface of the sensor element, And a first inclined portion formed to be inclined in the direction of approaching.
Further, the pressing portion according to the present invention is characterized by pressing the ground portion toward the electrode surface side of the sensor element.
Also, the ground portion according to the present invention may include a linear ground portion formed parallel to the electrode surface and in line contact with the electrode surface, and the first inclined portion may be inclined from the linear ground portion toward the outer surface side of the sensor element .
Further, the ground portion according to the present invention may include a second inclined portion formed to be inclined in a direction approaching the terminal body, and the second inclined portion may be inclined from the linear ground portion in an inner side direction of the sensor element .
Also, the ground unit according to the present invention may include a pointed ground unit for point contact with the electrode surface, and the first inclined unit may be inclined from the linear ground unit toward the outer surface of the sensor element.
The ground portion according to the present invention may include a second inclined portion formed to be inclined in a direction approaching the terminal body and the second inclined portion may be inclined from the pointed ground portion in an inner side direction of the sensor element .
At this time, the first inclined portion according to the present invention may be inclined at an angle of 10 to 50 degrees.

The gas sensor terminal of the present invention can minimize the contact of the terminal to a portion other than the electrode of the sensor element, thereby preventing the sensor element from being disassembled.
In addition, the gas sensor terminal of the present invention minimizes the area where the terminal directly contacts the sensor element, thereby realizing a stable electrical connection structure.
Further, the gas sensor terminal of the present invention has the effect of preventing the deformation of the sensor element and improving the durability of the gas sensor.

1 is an exploded perspective view of an oxygen sensor having an oxygen sensor terminal according to an embodiment of the present invention.
2 is a perspective view showing a structure in which an oxygen sensor terminal and a sensor element are in contact with each other.
3 is a side view showing a structure in which a conventional oxygen sensor terminal and a sensor element are in contact with each other.
4 is a front view showing a structure in which a conventional oxygen sensor terminal and a sensor element are in contact with each other.
5 is a front view showing the structure in which the oxygen sensor terminal and the sensor element are in contact with each other according to the first embodiment of the present invention.
6 is a front view showing a structure in which an oxygen sensor terminal and an oxygen sensor are in contact with each other according to a second embodiment of the present invention.
7 is a front view showing a structure in which an oxygen sensor terminal and an oxygen sensor are in contact with each other according to a third embodiment of the present invention.
8 is a front view showing a structure in which an oxygen sensor terminal and an oxygen sensor are in contact with each other according to a fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate a person skilled in the art to easily carry out the technical idea of the present invention. . In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The gas sensor is a generic term of a sensor for detecting a gas. Examples of the gas sensor include an oxygen (O 2 ) sensor, a knox (NO x ) sensor, etc. In the following embodiments, the oxygen sensor is used as a reference.
1 is an exploded perspective view of an oxygen sensor having an oxygen sensor terminal according to an embodiment of the present invention. Referring to FIG. 1, the oxygen sensor terminal 100 is installed to be in contact with the sensor element 300, and the holder 400 is disposed to surround the oxygen sensor terminal 100.
A conductive electrode surface 310 is formed at an end of the sensor element 300 to transmit and receive an electrical signal to and from the outside. For this purpose, a metallic oxygen sensor terminal 100 is grounded. A receiving hole 410 capable of receiving the sensor element 300 and the oxygen sensor terminal 100 may be formed in the holder 400 in the longitudinal direction of the holder 400. That is, the oxygen sensor terminal 100 may be arranged in a symmetrical structure so as to face the upper and lower surfaces of the sensor element 300 in the receiving hole 410 of the holder 400.
An unshown other side of the sensor element 300 is installed to be in contact with the exhaust gas. In addition, the holder 400 fixes the sensor element 300 and the terminal, and various components may be additionally mounted around the holder 400. [ The components of the oxygen sensor are well known in the art and will not be described in detail below.
The receiving hole 410 formed in the holder 400 may be a rectangular parallelepiped shaped groove but may be formed in a groove having another shape capable of fixing and supporting the terminal at the end of the sensor element 300 have. More specifically, the sensor element 300 is disposed at the center of the receiving hole 410 and the terminal is disposed symmetrically on the upper and lower surfaces of the receiving hole 410 so that the sensor element 300 and the terminal are fixed . Specifically, referring to FIG. 1, the receiving hole 410 is formed in a shape of 'H' in cross section, and a guide groove 420 is formed in which the terminal can be seated and fixed.
The oxygen sensor terminal 100 includes a connection unit 120 electrically connected to an ECU of a vehicle, a terminal body 110 connected to one end of the connection unit 120, And a pressing portion 200 that is bent and extended in the other direction.
The pressing part 200 includes a bent part 210 bent from one end of the terminal body 110 in the other direction so as to extend from the bent part 210 in a direction away from the terminal body 110 A second pressing part 230 extending from the first pressing part 220 in a direction approaching the terminal body 110 and a second pressing part 230 extending from the first pressing part 220 toward the terminal body 110. The first pressing part 220, And a grounding part 240 formed at a position where the second pressing part 230 meets the electrode surface 310 of the sensor element 300.
2 is a perspective view showing a structure in which an oxygen sensor terminal and a sensor element are in contact with each other. Parts of the oxygen sensor terminal and the holder 400 are omitted in order to easily understand the contact structure between the oxygen sensor terminal 100 and the sensor element 300 in the following drawings including this figure.
The sensor element 300 can be formed by molding a ceramic material such as zirconia into a rod shape. The sensor element 300 may include a contact surface 301 that is in contact with the exhaust gas on one side and an electrode surface 310 that is in contact with oxygen in the air on the other side. The surface other than the electrode surface 310 may include a non- (320). The contact surface 301 and the electrode surface 310 may be coated with platinum to form a negative electrode or a positive electrode.
The sensor element 300 generates a low voltage when the oxygen concentration in the exhaust gas is high and generates a high voltage when the oxygen concentration in the exhaust gas is low according to the difference between the oxygen concentration in the exhaust gas and the oxygen concentration in the atmosphere, (100) is grounded on the electrode surface (310) of the sensor element (300) to transmit the voltage generated in the sensor element (300) to the ECU.
FIG. 3 is a side view showing a structure in which a conventional oxygen sensor terminal is in contact with a sensor element, and FIG. 4 is a front view showing a structure in which a conventional oxygen sensor terminal is in contact with a sensor element.
In this case, the side view is a view showing the contact structure between the oxygen sensor terminal 100 and the sensor element 300 in the A direction in the perspective view of FIG. 2. For example, the front view is a view showing the oxygen And a contact structure between the sensor terminal 100 and the sensor element 300. FIG.
As shown in the drawing, the terminal body 110 of the conventional oxygen sensor terminal 100 is formed such that the entire ground portion 240 formed at the point where the first pressing portion 220 and the second pressing portion 230 meet, When the grounding unit 240 is pressed toward the electrode surface 310 of the sensor element 300 by the pressing unit 200, the oxygen sensor terminal 100 is connected to the sensor element 300 The non-electroconductive surface 320, which is a portion other than the electrodes of the electrodes 300, 300, can be contacted.
When the oxygen sensor terminal 100 is brought into contact with the non-electrode surface 320 of the sensor element 300, there is a problem that the sensor element 300 made of a ceramic material such as zirconia is disassembled and the oxygen sensor malfunctions or durability There was a problem of deterioration.
5 is a front view showing the structure in which the oxygen sensor terminal and the sensor element are in contact with each other according to the first embodiment of the present invention.
The oxygen sensor terminal 100 includes a terminal body 110 and a pressing portion 200. The pressing portion 200 is provided with a pressing portion 200 which is in contact with the electrode surface 310 of the sensor element 300, The ground unit 240 includes a first inclined portion 245 formed to be inclined in a direction approaching the terminal body 110.
The ground unit 240 includes a linear ground unit 241 formed parallel to the electrode surface 310 and in line contact with the electrode surface 310. The first inclined unit 245, May be formed to be inclined from the linear ground portion (241) toward the outer surface of the sensor element (300).
The grounding portion 240 of the pressing portion 200 can secure a gap that is spaced apart from a portion other than the electrode surface 310 of the sensor element 300, It is possible to effectively prevent the contact with the non-electroconductive surface 320 of the element 300. [
6 is a front view showing a structure in which an oxygen sensor terminal and an oxygen sensor are in contact with each other according to a second embodiment of the present invention.
The oxygen sensor terminal 100 includes a terminal body 110 and a pressing portion 200. The pressing portion 200 is provided with a pressing portion 200 which is in contact with the electrode surface 310 of the sensor element 300, The ground unit 240 includes a first inclined portion 245 formed to be inclined in a direction approaching the terminal body 110.
The ground portion 240 includes a pointed ground portion 242 for point contact with the electrode surface 310 and the first inclined portion 245 is disposed on the outer side surface of the sensor element 300 As shown in Fig.
The grounding part 240 of the pressing part 200 forms a point contact with the electrode surface 310 of the sensor element 300 so as not to be in line contact with the electrode surface 310 of the sensor element 300, So that it is possible to more effectively prevent the oxygen sensor terminal 100 from coming into contact with the non-conductive surface 320 of the sensor element 300.
7 is a front view showing a structure in which an oxygen sensor terminal and an oxygen sensor are in contact with each other according to a third embodiment of the present invention.
The oxygen sensor terminal 100 includes a terminal body 110 and a pressing portion 200. The pressing portion 200 is provided with a pressing portion 200 which is in contact with the electrode surface 310 of the sensor element 300, The ground unit 240 includes a first inclined portion 245 formed to be inclined in a direction approaching the terminal body 110.
The ground unit 240 includes a linear ground unit 241 formed in parallel with the electrode surface 310 and in line contact with the electrode surface 310. The first inclined unit 245, May be formed to be inclined from the linear ground portion (241) toward the outer surface of the sensor element (300).
The grounding portion 240 includes a second inclined portion 246 inclined in a direction approaching the terminal body 110 and the second inclined portion 246 includes the linear grounding portion 241, The sensor element 300 may be inclined in the direction of the inner side of the sensor element 300.
The grounding portion 240 of the pressing portion 200 has the first inclined portion 245 and the second inclined portion 246 together and the portion other than the electrode surface 310 of the sensor element 300 And the gap between the non-conductive surface 320 of the sensor element 300 and the non-conductive surface 320 of the sensor element 300 can be ensured at both ends of the ground portion 240, Can be effectively prevented from being brought into contact with each other.
8 is a front view showing a structure in which an oxygen sensor terminal and an oxygen sensor are in contact with each other according to a fourth embodiment of the present invention.
The oxygen sensor terminal 100 includes a terminal body 110 and a pressing portion 200. The pressing portion 200 is provided with a pressing portion 200 which is in contact with the electrode surface 310 of the sensor element 300, The ground unit 240 includes a first inclined portion 245 formed to be inclined in a direction approaching the terminal body 110.
The ground portion 240 includes a pointed ground portion 242 for point contact with the electrode surface 310 and the first inclined portion 245 is disposed on the outer side surface of the sensor element 300 As shown in Fig.
The ground portion 240 includes a second inclined portion 246 that is inclined in a direction approaching the terminal body 110 and the second inclined portion 246 includes the pointed ground portion 242, The sensor element 300 may be inclined in the direction of the inner side of the sensor element 300.
The grounding part 240 of the pressing part 200 has the first inclined part 245 and the second inclined part 246 together and is spaced apart from the non-electric conductive surface 320 of the sensor element 300 The gap can be secured at both ends of the grounding part 240 and the oxygen sensing terminal 100 is contacted to the non-conductive surface 320 of the sensor element 300 even if the oxygen sensing terminal 100 is pushed to any side of the sensor element 300 Can be effectively prevented. The grounding part 240 of the pressing part 200 forms a point contact with the electrode surface 310 of the sensor element 300 so as not to be in line contact with the electrode surface 310 of the sensor element 300, It is possible to more effectively prevent the oxygen sensor terminal 100 from coming into contact with the non-conductive surface 320 of the sensor element 300.
Preferably, the first inclined portion 245 is inclined at an angle? Of 10 to 50 degrees with respect to an imaginary line formed in parallel with the electrode surface 310 of the sensor element 300 Do. If the angle is less than 10 degrees, it may be contacted to a portion other than the electrode surface 310 of the sensor element 300 when the grounding portion 240 is pressed. If the angle is more than 50 degrees, The grounding of the ground portion 240 and the electrode surface 310 of the sensor element 300 may become unstable.
The second inclined portion 246 may be inclined at an angle of 10 to 50 degrees with respect to an imaginary line formed so as to be in parallel with the electrode surface 310 of the sensor element 300. [ Since the second inclined portion 246 is less likely to be in contact with the non-electroconductive surface 320 than the first inclined portion 245 at the position thereof, the angle of the second inclined portion 246 beta] is smaller than the angle [alpha] of the first inclined portion 245.
As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: gas sensor terminal 110: terminal body
120: connection part 200:
210: bent portion 220: first pressing portion
230: second pressing portion 240: grounding portion
241: linear ground portion 242:
245: first inclined portion 246: second inclined portion
300: sensor element 301: contact surface
310: Electrode surface 320: Non-electrifying surface
400: holder 410: receiving hole
420: Guide groove

Claims (7)

A gas sensor terminal for grounding a sensor element of a gas sensor to transmit and receive an electrical signal,
Terminal body; And
And a pressing portion that is bent and extended from the one end of the terminal body in the other direction,
Wherein the pressing portion includes: a bent portion formed by bending the other end of the terminal body from the other end;
A first pressing portion extending from the bent portion in a direction away from the terminal body;
A second pressing portion extending from the first pressing portion in a direction close to the terminal body;
A linear grounding portion formed in parallel with an electrode surface of the sensor element at a point where the first pressing portion and the second pressing portion meet and in line contact with an electrode surface of the sensor element; And
A first inclined portion formed to be inclined from the linear ground portion toward an outer side surface of the sensor element;
The gas sensor terminal comprising: The method according to claim 1,
And the pressing portion presses the ground portion toward the electrode surface side of the sensor element. delete 3. The method of claim 2,
And a second inclined portion formed to be inclined from the linear ground portion in a direction opposite to the first inclined portion. A gas sensor terminal for grounding a sensor element of a gas sensor to transmit and receive an electrical signal,
Terminal body; And
And a pressing portion that is bent and extended from the one end of the terminal body in the other direction,
Wherein the pressing portion includes: a bent portion formed by bending the other end of the terminal body from the other end;
A first pressing portion extending from the bent portion in a direction away from the terminal body;
A second pressing portion extending from the first pressing portion in a direction close to the terminal body;
A pointed ground portion formed at a point where the first pressing portion and the second pressing portion meet and making point contact with the electrode surface of the sensor element; And
A first inclined portion formed to be inclined from the pointed ground portion toward the outer side surface of the sensor element;
The gas sensor terminal comprising: 6. The method of claim 5,
And a second inclined portion that is formed to be inclined from the pointed ground portion in a direction opposite to the first inclined portion. 6. The method according to claim 1 or 5,
Wherein the first inclined portion is inclined at an angle of 10 to 50 degrees.
KR1020150057789A 2015-04-24 2015-04-24 Terminal for gas sensor KR101678778B1 (en)

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KR101678778B1 true KR101678778B1 (en) 2016-11-23

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007047093A (en) 2005-08-11 2007-02-22 Ngk Spark Plug Co Ltd Sensor
JP2008134219A (en) 2006-10-30 2008-06-12 Denso Corp Gas sensor and related manufacturing method
KR101414875B1 (en) 2013-02-25 2014-07-03 주식회사 현대케피코 Terminal structure for oxygen sensor
KR101500869B1 (en) 2013-10-28 2015-03-09 주식회사 현대케피코 Terminal assembly for oxygen sensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007047093A (en) 2005-08-11 2007-02-22 Ngk Spark Plug Co Ltd Sensor
JP2008134219A (en) 2006-10-30 2008-06-12 Denso Corp Gas sensor and related manufacturing method
KR101414875B1 (en) 2013-02-25 2014-07-03 주식회사 현대케피코 Terminal structure for oxygen sensor
KR101500869B1 (en) 2013-10-28 2015-03-09 주식회사 현대케피코 Terminal assembly for oxygen sensor

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