WO2005008233A1 - ガスセンサ及びガスセンサの製造方法 - Google Patents
ガスセンサ及びガスセンサの製造方法 Download PDFInfo
- Publication number
- WO2005008233A1 WO2005008233A1 PCT/JP2004/009971 JP2004009971W WO2005008233A1 WO 2005008233 A1 WO2005008233 A1 WO 2005008233A1 JP 2004009971 W JP2004009971 W JP 2004009971W WO 2005008233 A1 WO2005008233 A1 WO 2005008233A1
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- WIPO (PCT)
- Prior art keywords
- packing
- peripheral surface
- metal shell
- inner peripheral
- detection element
- Prior art date
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Classifications
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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
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
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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
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4078—Means for sealing the sensor element in a housing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49007—Indicating transducer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49169—Assembling electrical component directly to terminal or elongated conductor
Definitions
- the present invention relates to a gas sensor for detecting a specific gas in a gas to be measured and a method for manufacturing the gas sensor, and in particular, a member to be held, such as a bottomed cylindrical gas detection element or element holder, having a cylindrical shape.
- the present invention relates to a gas sensor held inside a metal shell and a method for manufacturing a gas sensor.
- a gas sensor in which a bottomed cylindrical gas detection element (held member) is held inside a cylindrical metal shell.
- a gas sensor 900 whose partial cross-sectional view is shown in FIG.
- This gas sensor 901 is an oxygen sensor attached to an exhaust gas pipe of an internal combustion engine to measure the oxygen concentration in exhaust gas.
- the gas sensor 901 includes a bottomed cylindrical gas detection element 911 having a closed end (the lower side in the figure) in the direction of the axis C, and a cylindrical metal shell 931 holding the gas detection element 911 coaxially inside. Is provided.
- the gas detection element 911 has a protruding portion 913 formed in the circumferential direction near the center in the direction of the axis C and protruding outward.
- the projecting portion 913 has a first tapered outer peripheral surface 913tl (also referred to as a distal end surface) which is located on the distal end side and expands from the distal end side to the proximal end side, It has a second tapered outer peripheral surface 913t2 (also referred to as a base end surface) expanding toward the center, and a central outer peripheral surface 913m of the same diameter connecting these surfaces.
- the gas detection element 911 is formed of a solid electrolyte having oxygen ion conductivity, and has an inner electrode 91 In attached to an inner peripheral surface 91 In and an outer electrode 917 attached to an outer peripheral surface 911 m. .
- the metal shell 931 includes a distal end 933 (lower side in the figure), a central part 935, and a proximal end 937 (upper side in the figure). From the top to the tip.
- the distal end portion 933 has a relatively small diameter inner peripheral surface 933 ⁇ , and on the outer periphery, a mounting screw portion 933 g for mounting the gas sensor 901 to the exhaust gas pipe is formed in the circumferential direction. In addition, the tip of the tip 933 is protected to protect the tip of the gas detection element 911.
- Cap 951 is attached.
- the protective cap 951 has a bottomed cylindrical shape, and has a large number of vent holes 951k for introducing exhaust gas in the exhaust pipe into the gas sensor 901.
- a gasket 953 is attached to the proximal end side of the distal end portion 933.
- the central portion 935 has a stepped portion 935b having a tapered inner peripheral surface 935tl (also referred to as a support surface) that is connected to the inner peripheral surface 933 ⁇ of the distal end portion 933 and expands toward the base end side.
- the outside of the central portion 935 is a hexagonal flange portion (tool engaging portion) 935r used when attaching the gas sensor 901 to the exhaust gas pipe.
- the base end 937 is connected to the central inner peripheral surface 935 ⁇ of the central portion 935, and has an inner peripheral surface 937 ⁇ larger in diameter than the central inner peripheral surface 935 ⁇ .
- An annular metal plate packing 957 is disposed on the tapered inner peripheral surface 935tl of the central portion 935 of the metal shell 931. Further, the plate packing 957 is coaxially inserted into the metal shell 931. The first tapered outer peripheral surface 913tl of the projected portion 913 of the gas detection element 911 abuts. That is, the stepped portion 935b of the central portion 935 of the metal shell 931 and the protruding portion 913 of the gas detection element 911 are engaged via the plate packing 957. Since the outer electrode 917 is also formed on the protruding portion 913, the metal shell 931 and the outer electrode 917 of the gas detection element 911 are electrically connected via the plate packing 957.
- the annular space defined by the base end side that is, the outer circumferential surface 911m of the gas detection element 911 and the inner circumferential surface 931 ⁇ of the metal shell 931 (the inner circumferential surface 937 ⁇ of the base end portion 937)
- the distal end 973 of the cylindrical enclosure 971 is inserted.
- the distal end portion 973 of the enclosing body 971 is a protruding portion formed in the circumferential direction and protruding outward, and has a tapered outer peripheral surface 973m expanding toward the distal end side.
- a C-shaped second wire Kin 965 is arranged, and the base end of base end 937 of metallic shell 931 is bent inward so as to cover second line packing 965, and second line packing 965 is compressed and caulked. Due to this compression and force, the first wire packing 959 and the filling sealing layer 961 are also compressed in the axial direction. Then, the first wire packing 959 is elastically deformed. Further, the gas detecting element 911 is coaxially held by the metal shell 931 by this elastic force.
- an element side terminal 981 is inserted, and is electrically connected to the inner electrode 915 of the gas detection element 911.
- Patent Document 1 is cited as a document related to such a technique, for example.
- Patent Document 1 Japanese Utility Model Application Publication No. 53-95884
- the first wire packing 959 is pressed only by the force of the metal shell 931 and squeezed, and is only sexually deformed. Therefore, when the gas sensor 901 is used for a long period of time and the compressive stress of the filling sealing layer 961 decreases due to the occurrence of force, loosening, etc., the first wire packing 959 is loosened and the gas detection element 911 is displaced. In addition, the detection accuracy of exhaust gas may be affected.
- the powder forming the filling sealing layer 961 passes through the gap between the outer peripheral surface 911m of the gas detecting element 911 and the inner peripheral surface 931 ⁇ of the metal shell 931 to be at the leading end. There is a risk of escaping to the side.
- the metal shell 931 and the outer electrode 917 of the gas detection element 911 are electrically connected via the plate packing 957, and the gas is filled when the caulking becomes loose.
- the compressive stress of the sealing layer 961 is reduced, the first line packing 959 is loosened, and the gas detection element 911 is displaced, the plate packing 957 and the gas detection element 911 (the outer electrode of the first tapered outer peripheral surface 913t). 917) and the metal shell 931 (tapered inner peripheral surface 935tl) are incompletely contacted, and the reliability of the electrical connection between the outer electrode 917 and the metal shell 931 is poor.
- the powder forming the filling sealing layer 961 passes through the gap between the outer peripheral surface 911m of the gas detection element 911 and the inner peripheral surface 931 ⁇ of the metal shell 931 to form a plate. It reaches a part of packing 957, between the plate packing 957 and the gas detection element 911, and the plate packing. There is also a possibility that the electrical contact between the plate packing 957 and the gas detection element 911 and the main metal member 931 may be impaired by entering between the metal member 957 and the metal shell 931.
- the conventional gas sensor 901 inserts the plate packing 957 and the gas detection element 911 into the metal shell 931 and then inserts the first wire packing 959, and further fills the powder. Thereafter, the surrounding body 971 and the second wire packing 965 are inserted, the base end of the metal shell 931 is caulked, and the gas detection element 911 is fixed to the metal shell 931.
- this kind of material is the powder force that should have been blocked by the first wire packing 959 during the time between filling the powder and pressing the metal shell 931. It passes through a gap between the outer peripheral surface 911m of the element 911 and the inner peripheral surface 931 ⁇ of the metal shell 931 to reach a portion of the plate packing 959, and between the plate packing 959 and the gas detection element 911, and between the plate packing 959 and the metal shell 931. As described above, electrical contact between the plate packing 957, the gas detection element 911, and the metal shell 931 may become defective.
- the present invention has been made in view of the current situation, and provides a gas sensor and a method of manufacturing a gas sensor that can more surely suppress the displacement of a held member such as a gas detection element or an element holder. With the goal.
- the solution is to provide a member to be held having a distal-side holding surface, a proximal-side holding surface located closer to the proximal side than the distal-side holding surface, a cylindrical shape, and an inner peripheral surface.
- a stepped portion projecting radially inward from the support member, and supporting the distal end side holding surface of the held member with the support surface of the stepped portion while surrounding the held member in the radial direction to form the held member.
- a proximal end holding surface of the held member and the inner peripheral surface of the metal shell are arranged in a wedge-shaped cross section in a gap forming an acute angle, and a base end holding surface of the held member and the metal shell are provided.
- a gas sensor characterized by being pressed against an inner peripheral surface of a tool.
- the wire packing in the conventional gas sensor is elastically deformed in the axial direction, and partially abuts the base-side holding surface of the held member and the inner peripheral surface of the metal shell.
- the first packing corresponding to the conventional wire packing is held
- the base-side holding surface of the member and the inner peripheral surface of the metal shell are arranged in a wedge-shaped cross section in a gap forming an acute angle, and the base-side holding surface of the held member and the inner peripheral surface of the metal shell.
- the gas sensor may be any one that satisfies the above requirements, and examples thereof include an oxygen sensor, an Nx sensor, an HC sensor, and a C2 sensor.
- the phrase “the metal shell holds the held member inside itself” includes holding the whole held member and a part of the held member inside the metal shell.
- the first packing does not necessarily have to have a wedge-shaped cross section over the entire circumference of the packing disposed in the gap, and at least a part may have a wedge-shaped cross section.
- the first packing need not have a wedge-shaped cross section as a whole, but may have a wedge-shaped shape at least on the tip end side.
- the held member has a protruding portion including the distal end side holding surface and the base end holding surface and protruding outward in the radial direction, and the distal end side in the axial direction is closed.
- the gas sensor may be a gas detecting element having a bottomed cylindrical shape.
- the held member is the bottomed tubular gas detection element itself. Since the gas detection element has a protrusion that includes the distal-side holding surface and the base-side holding surface and protrudes radially outward, the first packing presses against the base-side holding surface of the protrusion of the gas detection element. As well as the inner peripheral surface of the metal shell. In such a case, the gas detection element can be fixed to the metal shell by the first packing even when no external force acts on the first packing. For this reason, even if the gas sensor is used for a long period of time and the caulking becomes loose, the first packing is less likely to be loosened than before, so that the displacement of the gas detection element can be suppressed more reliably.
- the gas sensor described above further comprises a gas detection element extending in the axial direction, wherein the held member has the distal end side holding surface and the base end side holding surface, and the gas detection element is Gas sensor characterized by being an element holder having an opening through which it passes It is good to
- the held member is an element holder into which the gas detection element is inserted. Since the element holder has the distal end holding surface and the base end holding surface, the first packing is pressed against the base end holding surface of the element holder and is pressed against the inner peripheral surface of the metal shell. In such a case, the element holder can be fixed to the metal shell by the first packing even if no external stress acts on the first packing. For this reason, even if the gas sensor is used for a long period of time and the force is loosened, the first packing is less likely to be loosened than before, and the displacement of the element holder can be suppressed more reliably.
- a gas sensor having a filling sealing layer filled with powder it is preferable to provide a gas sensor having a filling sealing layer filled with powder.
- the gap formed by the outer peripheral surface of the gas detection element and the inner peripheral surface of the metallic shell on the base end side of the first packing is filled with powder. It has a filling sealing layer. Therefore, the sealing performance between the gas detection element and the metal shell can be further improved.
- the gas sensor has been used for a long period of time, causing loosening, etc., resulting in a gap between the outer peripheral surface of the projecting portion of the gas detection element and the inner peripheral surface of the metal shell, or the outer periphery of the element holder. There was a risk that the tip would leak out of the gap between the surface and the inner peripheral surface of the metal shell.
- the first packing is formed into a wedge-shaped cross section at an acute gap formed between the base-side holding surface of the held member (gas detection element or element holder) and the inner peripheral surface of the metal shell.
- the metal member is pressed against the base-side holding surface of the held member and the inner peripheral surface of the metal shell. Therefore, even if the gas sensor is used for a long period of time, even if the force is loosened, the powder is not removed from the gap between the outer peripheral surface of the projecting portion of the gas detecting element and the inner peripheral surface of the metal shell, or the outer periphery of the element holder. It is possible to suppress the leakage to the tip side from the gap between the surface and the inner peripheral surface of the metal shell.
- the first packing includes a wire pad inserted into the gap between a base end side holding surface of the held member and an inner peripheral surface of the metal shell.
- the gas sensor is characterized in that the gasket has a wedge-shaped cross section by plastically deforming the packing by pressing it in the axial direction.
- the first packing presses in an axial direction the wire packing inserted into the gap between the base-end holding surface of the held member and the inner peripheral surface of the metal shell to plastically deform. Therefore, it has a wedge-shaped cross section.
- Such a first packing is pressed so strongly that the packing is plastically deformed, and has a wedge-shaped shape. Therefore, the first packing is strongly pressed against the base-side holding surface of the held member and the inner peripheral surface of the metal shell. . Therefore, the held member and the metal shell can be firmly fixed.
- the base-side holding surface of the member to be held and the inner peripheral surface of the metal shell are at least the front-end side of the gap.
- an angle formed between the base-side holding surface and the inner peripheral surface becomes smaller toward the front end side, and the first packing is formed by the first packing and the base-side holding surface and the inner surface of the gap.
- the gas sensor may be provided so that the angle formed with the peripheral surface becomes smaller toward the tip.
- the base-side holding surface of the member to be held and the inner peripheral surface of the metal shell are formed at least at the front-end side of the gap-forming portion with the base-side holding surface. It has a form in which the angle with the peripheral surface becomes smaller toward the tip. Then, the first packing is arranged up to that part. In such a structure, the effect of the wedge is increased toward the tip end of the first packing, so that the held member and the metal shell can be more firmly fixed.
- a gas detection element which has a cylindrical shape with a closed bottom at the axial end, has an outer electrode on the outer peripheral surface, and has a protrusion protruding radially outward.
- a tubular portion having a stepped portion projecting radially inward from an inner peripheral surface, and having a distal end surface of the projecting portion supported by the support surface of the stepped portion while radially outside the gas detection element.
- a metal shell for holding the gas detection element inside itself, wherein the supporting surface of the stepped portion abuts on the outer electrode on the distal end surface of the protruding portion to electrically connect with the outer electrode.
- the first packing includes a base end face of the protruding portion and the main body.
- a wedge-shaped cross section is installed in the gap at an acute angle with the inner peripheral surface of the bracket And a gas sensor that is pressed against a base end surface of the protruding portion and an inner peripheral surface of the metal shell.
- the wire packing in the conventional gas sensor is elastically deformed in the axial direction, and partially contacts the base end surface of the protruding portion of the gas detection element and the inner peripheral surface of the metal shell.
- the first packing corresponding to the conventional wire packing has a wedge-shaped cross section in an acute gap formed between the base end surface of the protruding portion of the gas detection element and the inner peripheral surface of the metal shell. It is arranged in a shape and is pressed against the base end surface of the protruding portion and the inner peripheral surface of the metal shell. Therefore, even if no external stress acts on the first packing, the first packing can fix the gas detection element to the metal shell.
- the first packing is less likely to be loosened than before, so that the displacement of the gas detection element is suppressed and the tip of the protrusion of the gas detection element is prevented. Poor contact between the outer electrode on the surface and the support surface of the stepped portion of the main metal fitting can be suppressed. Therefore, the reliability of the electrical connection between the outer electrode of the gas detection element and the metal shell can be improved.
- a gas detection element which has a cylindrical shape with a closed bottom at the axial end, has an outer electrode on the outer peripheral surface, and has a protrusion protruding radially outward.
- a tubular portion having a stepped portion projecting radially inward from an inner peripheral surface, and having a distal end surface of the projecting portion supported by the support surface of the stepped portion while radially outside the gas detection element.
- a metal shell holding the gas detection element inside itself, a first packing abutting on a base end surface of the protruding portion and an inner peripheral surface of the metal shell, and a front end surface of the protruding portion.
- the outer electrode and the metal shell are disposed between the supporting surface of the stepped portion and electrically contact the outer electrode and the metal shell by respectively contacting the outer electrode and the supporting surface of the stepped portion on the distal end surface of the protruding portion.
- a wedge-shaped cross section is disposed in a gap between the base end surface of the protruding portion and the inner peripheral surface of the metal shell, the base end surface of the protruding portion and the inner peripheral surface of the metal shell. This is a gas sensor characterized by being pressed against each other.
- the first packing is provided in a wedge-shaped cross section in an acute gap formed between the base end surface of the protruding portion of the gas detection element and the inner peripheral surface of the metallic shell. It is pressed against the base end surface of the part and the inner peripheral surface of the metal shell. Therefore, the first packing This gasket can fix the gas detection element to the metal shell without external stress.
- the first packing is less likely to be loosened than before, so the displacement of the gas detection element is suppressed, and the second packing and the gas detection Poor contact between the outer electrode on the tip end surface of the protruding portion of the element and the support surface of the stepped portion of the metal shell can be suppressed. Therefore, the reliability of the electrical connection between the outer electrode of the gas detection element and the metal shell can be improved.
- the gas sensor is located on the base end side with respect to the projecting portion, and includes an outer peripheral surface of the gas detecting element and an inner peripheral surface of the metal shell. It is preferable to provide a gas sensor characterized by having a filling sealing layer in which the powder is filled in the thus configured void.
- the gap defined by the outer peripheral surface of the gas detection element and the inner peripheral surface of the metal shell has a filling sealing layer filled with powder. Therefore, the sealing performance between the gas detection element and the main fitting can be further improved.
- the first packing is provided in a wedge-shaped cross section in an acute gap formed between the base end surface of the protruding portion of the gas detection element and the inner peripheral surface of the metal shell. It is pressed against the base end face of the part and the inner peripheral surface of the metal shell. Therefore, even if the gas sensor is used for a long period of time, even if the force is loosened, the powder reaches the second packing through the gap between the outer peripheral surface of the projection of the gas detection element and the inner peripheral surface of the metal shell. It is possible to prevent the second packing and the gas detection element or the second packing and the metal shell from getting into contact with each other, thereby preventing poor contact.
- the first packing is made of metal, and is in contact with the outer electrode on the base end surface of the protruding portion and the inner peripheral surface of the metal shell, respectively.
- the gas sensor may be characterized in that the gas sensor contacts and electrically connects the outer electrode and the metal shell.
- the first packing comes into contact with the outer electrode on the base end surface of the protruding portion of the gas detection element and the inner peripheral surface of the metal shell, respectively, so that the outer electrode of the gas detection element and the metal shell are in contact with each other. Electrical connection with the tool. For this reason, the outer electrode of the gas detection element and the metal shell can be more reliably electrically connected.
- the first packing is formed by inserting a wire packing inserted into the gap between a base end surface of the protruding portion and an inner peripheral surface of the metal shell in the axial direction.
- the gas sensor is preferably characterized in that it has a wedge-shaped cross section by being plastically deformed by being pressed.
- the first packing is formed into a wedge cross-section by pressing the line packing inserted into the gap between the base end surface of the protruding portion and the inner peripheral surface of the metal shell in the axial direction to cause plastic deformation. It has a shape. Such a first packing is pressed so strongly that the packing is plastically deformed, and has a wedge-shaped shape. Therefore, the first packing strongly contacts the base end surface of the protruding portion and the inner peripheral surface of the metal shell. Therefore, the gas detection element and the metallic shell can be firmly fixed.
- the base end surface of the protruding portion and the inner peripheral surface of the metal shell may be at least a distal end portion of the gap.
- An angle between the base end surface and the inner peripheral surface is smaller toward the distal end side, and the first packing is such that, in the gap, an angle between the base end surface and the inner peripheral surface is closer to the distal end side. It is preferable to provide a gas sensor characterized in that the gas sensor is provided even in a portion that becomes smaller as the size of the gas sensor decreases.
- the base end surface of the protruding portion and the inner peripheral surface of the metal shell have an angle formed by the base end surface and the inner peripheral surface in at least the distal end portion of the gap. It has a form that becomes smaller toward the tip. Then, the first packing is provided up to this portion. In such a structure, the effect of the wedge is increased toward the tip end of the first packing, so that the gas detection element and the metal shell can be more firmly fixed.
- a gas detection element which has a closed-end cylindrical shape with a closed end in the axial direction, has an outer electrode on the outer peripheral surface, and has a protrusion protruding radially outward.
- a tubular portion having a stepped portion projecting radially inward from an inner peripheral surface, and having a distal end surface of the projecting portion supported by the support surface of the stepped portion while radially outside the gas detection element.
- a metal shell surrounding the gas detection element and holding the gas detection element inside the metal detection element.
- a metal shell whose supporting surface is in contact with the outer electrode on the distal end surface of the protruding portion and is electrically connected to the outer electrode; and a base metal surface of the protruding portion and an inner peripheral surface of the metal shell.
- a method for manufacturing a gas sensor comprising: a first packing in contact with the gas sensor, wherein an element inserting step of inserting the gas detection element into the main fitting; and a line packing for inserting a line packing serving as the first packing. And pressing the wire packing inserted into the metal shell in the axial direction to plastically deform the wire packing so that the base end surface of the protruding portion and the inner peripheral surface of the metal shell have an acute angle. Forming the first packing having a wedge-shaped cross section in the gap formed, and pressing the first packing against the base end surface of the protruding portion and the inner peripheral surface of the metal shell, respectively. Characteristic gasses This is the method of manufacturing the sensor.
- wire packing insertion step After the gas detection element is inserted into the metallic shell (element insertion step), wire packing is inserted (wire packing insertion step). Thereafter, the wire packing is pressed in the axial direction, and the wire packing is plastically deformed, and is arranged in a wedge-shaped cross section in an acute gap formed between the base end surface of the protrusion and the inner peripheral surface of the metal shell. At the same time, they are pressed against the base end surface of the protruding portion and the inner peripheral surface of the metal shell (first packing forming step). With this configuration, the first packing formed by plastic deformation strongly presses against the base end surface of the protruding portion of the gas detection element and also strongly presses against the inner peripheral surface of the metal shell.
- the first packing can fix the gas detection element to the metal shell. For this reason, even if the gas sensor is used for a long time and the power is loosened, the first packing is less likely to be loosened than in the past, so that the displacement of the gas detection element is suppressed and the protrusion of the gas detection element is reduced. Poor contact between the outer electrode on the tip surface and the support surface of the stepped portion of the metal shell can be suppressed. Therefore, it is possible to improve the reliability of the electrical connection between the outer electrode of the gas detection element and the metal shell. Since the first packing as described above is formed by utilizing the wire packing and plastically deforming the wire packing, the gas sensor can be manufactured at low cost and easily.
- a gas detection element which has a cylindrical shape with a closed bottom on the axial end side, has an outer electrode on the outer peripheral surface, and has a protrusion protruding radially outward.
- a cylindrical portion having a stepped portion protruding radially inward from the inner peripheral surface;
- a cylindrical metal shell for supporting the gas detection element inside itself while supporting a distal end surface on a support surface of the stepped portion in a radial direction of the gas detection element, and a base of the protrusion;
- a first packing contacting an end surface and an inner peripheral surface of the metal shell, and a first packing disposed between a distal end surface of the protruding portion and a support surface of the stepped portion;
- a method for manufacturing a gas sensor comprising: a metal second packing that abuts an outer electrode and a support surface of the stepped portion to electrically connect the outer electrode and the metal shell.
- the first packing having a wedge-shaped cross section is formed in a gap at an acute angle with the inner peripheral surface, and the first packing is formed by pressing the first packing against a base end surface of the protruding portion and an inner peripheral surface of the metal shell. And a process for producing a gas sensor.
- the gas detecting element is further inserted (the element inserting step), and the second packing and the gas detecting element are pressed in the axial direction. Then, the second packing is brought into close contact with the supporting surface of the stepped portion of the metal shell (second packing pressing step). Therefore, the contact between the second packing and the metal shell is improved.
- the wire packing is inserted (wire packing input step). Thereafter, the wire packing is pressed in the axial direction, and the wire packing is plastically deformed, and is arranged in a wedge-shaped cross section in an acute gap formed between the base end surface of the protruding portion and the inner peripheral surface of the metal shell. At the same time, they are pressed against the base end surface of the protruding portion and the inner peripheral surface of the metal shell (first packing forming step).
- first packing formed by plastic deformation strongly presses against the base end surface of the protruding portion of the gas detection element and also strongly presses against the inner peripheral surface of the metal shell.
- the first packing allows the gas detecting element to be used as a base metal. Can be fixed to the tool.
- the first packing is less likely to be loosened than before, so that the displacement of the gas detection element is suppressed and the protrusion of the gas detection element is reduced. Poor contact between the outer electrode on the tip surface and the support surface of the stepped portion of the metal shell can be suppressed. Therefore, the reliability of the electrical connection between the outer electrode of the gas detection element and the metal shell can be improved. Since the first packing as described above is formed by using a wire packing and plastically deforming the wire packing, it is possible to easily and inexpensively manufacture a gas sensor.
- FIG. 1 is a cross-sectional view of a gas sensor according to Embodiment 1.
- FIG. 2 is a partially enlarged cross-sectional view showing the vicinity of a first packing and a plate packing of the gas sensor according to the first embodiment.
- FIG. 3 is a partially enlarged cross-sectional view of a main part near a first packing of the gas sensor according to Embodiment 1.
- FIG. 4 is an explanatory view showing a pressing jig for pressing a wire packing in the method for manufacturing a gas sensor according to Embodiment 1.
- FIG. 5 is an explanatory view showing how a wire packing is plastically deformed in the method for manufacturing a gas sensor according to Embodiment 1.
- FIG. 6 is a partially enlarged cross-sectional view near a first packing of the gas sensor according to Embodiment 2.
- FIG. 7 is a cross-sectional view of a gas sensor according to Embodiment 3.
- FIG. 8 is a partially enlarged sectional view of the vicinity of a first packing and a plate packing of the gas sensor according to Embodiment 3.
- FIG. 9 is a partially enlarged cross-sectional view of a main part near a first packing of the gas sensor according to Embodiment 3.
- FIG. 10 is a cross-sectional view of a gas sensor according to Embodiment 4.
- FIG. 11 is a partially enlarged cross-sectional view of the vicinity of a first packing and a plate packing of the gas sensor according to Embodiment 4.
- FIG. 12 is a partially enlarged cross-sectional view of a main part near a first packing of a gas sensor according to Embodiment 4.
- FIG. 13 is a partial cross-sectional view of a gas sensor according to the related art.
- FIG. 1 is a cross-sectional view of the gas sensor 101 of the present embodiment
- FIG. 2 is a partially enlarged cross-sectional view of the vicinity of the first packing 159 and the plate packing (second packing) 157.
- FIG. 3 shows a partially enlarged cross-sectional view of a main part near the first packing 159.
- the gas sensor 101 is an oxygen sensor attached to an exhaust gas pipe of an internal combustion engine to measure the oxygen concentration in exhaust gas.
- the gas sensor 101 has a bottomed cylindrical gas detecting element (member to be held) 111 having a closed end (lower side in the figure) in the direction of the axis C, and a cylindrical shape for holding the gas detecting element 111 coaxially inside. And a metal shell 131.
- the gas detecting element 111 is formed in the circumferential direction near the center in the direction of the axis C, and is formed in the radial direction. It has a protrusion 113 protruding outward.
- the protruding portion 113 has a first tapered outer peripheral surface (distal surface (distal side holding surface)) 113tl which is located on the distal side and expands from the distal side to the proximal side, and a proximal side which is located on the proximal side.
- the gas detection element 111 is made of a solid electrolyte having oxygen ion conductivity, for example, a solid electrolyte mainly containing partially stabilized zirconia.
- An inner electrode 115 is formed on substantially the entire inner peripheral surface 11 In of the gas sensor element 111.
- the outer electrode 117 is formed on substantially the entire front end portion of the outer peripheral surface 111m protruding from the metal shell 131. Further, an outer electrode 117 is formed linearly in the axial direction on the base end side of the distal end portion up to the protruding portion 113.
- the inner electrode 115 and the outer electrode 117 are mainly made of Pt.
- the metal shell 131 is made of stainless steel (SUS430), and has a distal end 133 (lower side in the figure), a central part 135, and a base end 137 (upper side in the figure).
- the configured through-hole has a shape that tapers from the base end to the tip end.
- the distal end portion 133 has an inner peripheral surface 133 ⁇ having a relatively small diameter (approximately 6.5 mm in diameter), while an outer peripheral portion is provided with a mounting screw portion 133g for mounting the gas sensor 101 to an exhaust gas pipe in a circumferential direction. ing. Further, a protection cap 151 for protecting the tip of the gas detection element 111 is attached to the tip of the tip 133.
- the protection cap 151 is made of stainless steel, has a cylindrical shape with a bottom, and has a large number of ventilation holes 151k for introducing exhaust gas in an exhaust pipe into the gas sensor 101.
- a gasket 153 made of stainless steel is attached to the proximal end of the distal end 133.
- the central portion 135 is connected to the inner peripheral surface 133 ⁇ of the distal end portion 133 and has a first tapered inner peripheral surface (support surface) 135tl extending toward the base end side.
- a cylindrical portion 135c having a central inner peripheral surface 135 ⁇ connected to the tapered inner peripheral surface 135tl and having a diameter (about 9.1mm in diameter) larger than the inner peripheral surface 133 ⁇ , and a proximal end connected to the central inner peripheral surface 135 ⁇ .
- 2nd table expanding toward A second stepped portion 135d having an inner circumferential surface 135t2.
- the outer side of the central portion 135 is a hexagonal flange portion (tool engaging portion) 135r used when attaching the gas sensor 101 to the exhaust gas pipe.
- the base end 137 is connected to the second tapered inner peripheral surface 135t2 of the central portion 135, and has an inner peripheral surface 137n larger in diameter (about 12.5 mm in diameter) than the central inner main surface 135n.
- an annular 0.3 mm-thick metal (SUS430) plate packing 157 is arranged on the first tapered inner peripheral surface 135tl of the central portion 135 of the metal shell 131. It is in close contact with the peripheral surface 135tl.
- the first tapered outer peripheral surface 113tl of the protruding portion 113 of the gas detection element 111 provided coaxially with the metal shell 131 is in contact with the plate packing 157. That is, the first stepped portion 135b of the central portion 135 of the metal shell 131 and the protruding portion 113 of the gas detection element 111 are securely engaged with each other via the plate packing 157.
- the plate packing 157 electrically and reliably connects the outer electrode 117 of the gas detection element 111 and the metal shell 131.
- a C-shaped first packing 159 composed of Ni and NW2201 IIS H4551-2002 is disposed at a position to close the gap between the first packing 159 and the NW2201. That is, the first packing 159 is disposed in a wedge-shaped cross section in an acute gap 120 formed between the second tapered outer peripheral surface 113t2 of the protrusion 113 and the central inner peripheral surface 135n of the metal shell 131.
- the second tapered outer peripheral surface 113t2 of the protruding portion 113 and the central inner peripheral surface 135 ⁇ of the main metal fitting 131 are pressed against each other. More specifically, in the gap 120 (see FIG. 3), the leading end portion of the second tapered outer peripheral surface 113t2 of the projecting portion 113 is the first curved surface 113t21. The angle formed by the second tapered outer peripheral surface 113t2 and the central inner peripheral surface 135 ⁇ of the metal shell 131 becomes smaller toward the distal end. Then, the first packing 159 is provided even to a portion where the angle becomes small.
- the first packing 159 was originally a line packing having a diameter of about 0.6 mm, but is plastically deformed by being pressed toward the tip end in the axial direction, and has a wedge-shaped shape as described above.
- the base end side of the protrusion 113 of the gas detection element 111 (the base end side of the first packing 159)
- the outer peripheral surface 11 lm on the proximal end side of the gas detecting element 111 and the inner peripheral surface 13 In of the metal shell 131 (the inner peripheral surface 135 t 2 of the second tapered inner peripheral surface 135 of the central portion 135 and the inner peripheral surface of the proximal end portion 137).
- the surface formed by the surface 137 ⁇ ) is filled with a powder mainly composed of talc to form a filling sealing layer 161.
- the distal end portion 173 of the cylindrical enclosure 171 is inserted.
- the enclosure 171 is made of alumina.
- the distal end portion 173 of the enclosing body 171 is a large-diameter portion formed in the circumferential direction and protruding outward, and has a tapered outer peripheral surface 173m expanding toward the distal end side.
- a second wire packing 165 made of stainless steel (SUS430) is arranged on the tapered outer peripheral surface 173m, and a base end 137 of the metal shell 131 is provided so as to cover the second wire packing 165.
- the proximal end is bent inward, and the second wire packing 165 is compressed and squeezed.
- the filling sealing layer 161 is compressed in the axial direction, and the gas detection element 111 is held coaxially with the metal shell 131.
- the sealing property between the outer peripheral surface 11 lm of the gas detecting element 111 and the inner peripheral surface 13 In of the metal shell 131 is ensured by the elastic force (stress) of the filling sealing layer 161 generated by compression and force. Te, ru.
- An element-side terminal 181 is inserted inside the gas detection element 111, and is electrically connected to the inner electrode 115 of the gas detection element 111. Further, the element side terminal 181 is electrically connected to an enclosure side terminal 183 formed inside the enclosure 171 to output an output signal from the gas detection element 111 to the outside.
- the element side terminal 181 and the enclosure side terminal 183 are made of a Ni alloy such as Inconel.
- the first packing 159 is formed by the second tapered outer peripheral surface (the base end surface (the base end holding surface) of the protrusion 113 of the gas detection element 111). In addition to being pressed against 113 t2, it is also pressed against the inner peripheral surface 131 ⁇ of the metal shell 131 (the central inner peripheral surface 135 ⁇ ). Therefore, the gas sensing element (member to be held) 111 can be fixed to the metal shell 131 by the first packing 159 even when no external stress acts on the first packing 159.
- the first packing 159 is less likely to be loosened than before, so that the displacement of the gas detecting element 111 is suppressed and the plate packing is suppressed.
- the first packing 159 has a wedge-shaped cross section by pressing the line packing inserted into the gap 120 in the axial direction and plastically deforming it. Such a first packing 159 is pressed strongly enough so that the packing is plastically deformed, and has a wedge-shaped shape. Therefore, the first packing 159 is strongly pressed against the second tapered outer peripheral surface 113t2 and the central inner peripheral surface 135 ⁇ , respectively. Therefore, the gas detection element 111 and the metal shell 131 can be firmly fixed.
- the angle formed by the second tapered outer peripheral surface 113t2 and the inner peripheral surface 131 ⁇ becomes smaller toward the distal end side (the first curved surface 113t21 in FIG. 3). Since the first packing 159 is provided, the effect of the wedge increases at the tip end side of the first packing 159, and the gas detection element 111 and the metal shell 131 can be more firmly fixed.
- the outer peripheral surface 111m on the proximal end side of the gas detection element 111 and the inner peripheral surface 131 ⁇ of the metal shell 131 (the second tapered inner peripheral surface 135t2 of the central portion 135 and the proximal end portion 137) And the inner peripheral surface 137 ⁇ ) of the sealing layer 161 is filled with a powder. Therefore, the sealing performance between the gas detection element 111 and the metal shell 131 can be further improved.
- the first packing 159 as described above allows the powder to remain on the outer peripheral surface of the projecting portion 113 of the gas detecting element 111 (central outer peripheral surface 113 m). ) And the inner peripheral surface (central inner peripheral surface 135 ⁇ ) of the metal shell 131 to prevent the gasket 157 from reaching the plate packing 157 and the plate packing 157 and the gas detection element 111 or the plate packing 157 and the main body.
- the force S can be prevented from penetrating between the metal fittings 131 and making these contacts defective.
- a metal shell 131 molded into a predetermined shape by a known method is prepared.
- the inner electrode 115 and the outer electrode 117 are applied to the solid electrolyte body by a known method, and baked.
- the prepared gas detection element 111 is prepared.
- a plate packing 157 having a thickness of about 0.3 mm is inserted into the metal shell 131, and the plate packing 157 is arranged on the first tapered inner peripheral surface 135tl of the stepped portion 135b of the central portion 135 (second packing). Kin import process).
- the gas detection element 111 is coaxially inserted into the metal shell 131, and the first tapered outer peripheral surface 113 tl of the projection 113 of the gas detection element 111 is brought into contact with the plate packing 157 (element insertion step). ).
- the plate packing 157 and the gas detection element 111 are pressed in the axial direction with a force of about 3 kN, so that the plate packing 157 is brought into contact with the first tapered inner peripheral surface 135 tl of the stepped portion 135b of the central portion 135. (2nd packing pressing step).
- the wire packing 159 serving as the first packing 159 is inserted into the metal shell 131 in which the gas detection element 111 is inserted, and the wire packing 159 is provided on the base end side of the protrusion 113 of the gas detection element 111. It is arranged between the outer peripheral surface 111m of the gas detecting element 111 and the inner peripheral surface 131 ⁇ of the metal shell 131 (gap 120) (line packing insertion step) (see FIG. 4).
- the wire packing 159 is pressed toward the distal end in the axial direction, and the wire packing 159 is plastically deformed in the axial direction to form the first packing 159 (first packing forming step).
- the wire packing 159 is pressed with a force of about 5 kN toward the distal end in the axial direction indicated by the arrow in the figure.
- the pressing jig 201 has a cylindrical shape, and has a small-diameter distal end portion 203 and a large-diameter proximal end portion 205.
- the distal end 203 has a size that can be inserted into a gap defined by the outer peripheral surface 111m on the proximal end side of the gas detection element 111 and the inner peripheral surface 131 ⁇ of the metal shell 131.
- the wire packing 159 has a thin shape so that the wire packing 159 can be pressed.
- the wire packing 159 is plastically deformed from a circular shape to a wedge shape in cross section, and the second tapered outer peripheral surface 113t2 of the projecting portion 113 of the gas detecting element 111 and the central portion 135 of the metallic shell 131 are formed. It is pressed against the central inner peripheral surface 135 n.
- a powder mainly composed of talc is applied to the outer peripheral surface 11 lm on the base end side of the gas detection element 111 and the metal shell 131 by a known method.
- the space formed by the peripheral surface 13 In is filled.
- the distal end portion 173 of the enclosure 171 is inserted into the space, and pressed in the axial direction.
- the wire packing 165 is inserted and arranged on the tapered outer peripheral surface 173 m of the distal end portion 173 of the enclosure 171.
- the base end of the base end portion 137 of the metal shell 131 is bent inward and compressed in the axial direction to increase the force.
- the element side terminal 181 is inserted into the gas detection element 111, and is brought into contact with the inner electrode 115 of the gas detection element 111.
- the enclosure-side terminal 183 is inserted and fixed inside the enclosure 171.
- the protective cap 151 is attached to the distal end of the metallic shell 131
- the gasket 153 is attached to the base end side of the distal end 133 of the metallic shell 131.
- the plate packing (second packing) 157 is pressed in the axial direction, and the plate packing 157 is pressed.
- the metal shell 131 is in close contact with the first tapered inner peripheral surface (support surface) 135tl of the stepped portion 135b. Therefore, the contact between the plate packing 157 and the metal shell 131 is improved.
- the wire packing 159 is pressed in the axial direction and is plastically deformed into a wedge shape, and the wire packing (first packing) 159 is formed on the protrusion 113 of the gas detecting element 111.
- the second tapered outer peripheral surface 113t2 is pressed against the central inner peripheral surface 135 ⁇ of the central portion 135 of the metal shell 131, respectively. Therefore, the gas sensing element (member to be held) 111 can be fixed to the metal shell 131 by the first packing 159 even when no external stress acts on the first packing 159.
- the first packing 159 is less likely to be loosened than before, so that the displacement of the gas detecting element 111 is suppressed, and the plate packing 157 and the ,
- FIG. 6 shows a partially enlarged cross-sectional view of a main part of the gas sensor according to the present embodiment.
- This gas sensor differs from the first embodiment in that the plate packing (second packing) is eliminated.
- the other parts are the same as those in the first embodiment, and thus the same reference numerals are given and the description thereof will be omitted.
- the first stepped portion 135b of the central portion 135 of the metal shell 131 directly engages with the projection 113 of the gas detection element 111, and the outer electrode 117 of the gas detection element 111 and the metal shell 131 are directly electrically connected.
- the first packing 159 strongly presses against the second tapered outer peripheral surface (base end surface (base end holding surface)) 113t2 of the projecting portion 113 of the gas detection element 111, and the metal shell 13 It also strongly presses against the inner peripheral surface 131 ⁇ (center inner peripheral surface 135 ⁇ ). Therefore, the gas detection element (member to be held) 111 can be fixed to the metal shell 131 by the first packing 159 even when no external stress acts on the first packing 159.
- the first packing 159 is less likely to be loosened than before, so that the displacement of the gas detecting element 111 is suppressed, and the plate packing 157 and the gas
- the step related to the absence of the plate packing is omitted. That is, after preparing the metal shell 131 and the gas detection element 111, the element insertion step is performed without performing the second packing insertion step. Next, a wire packing inserting step is performed without performing the second packing pressing step. After that, a first packing forming step is performed as in the first embodiment. Thereafter, the gas sensor is completed in the same manner as in the first embodiment. [0067] Also in the present embodiment, since the first packing 159 is formed by performing the first packing forming step, even if no external stress acts on the first packing 159, the first packing 159 is formed.
- the gas detection element (member to be held) 111 can be fixed to the metal shell 131. For this reason, even if force, loosening, or the like occurs by using the gas sensor 101 for a long period of time, the first packing 159 is less likely to be loosened than in the past, and the displacement of the gas detection element 111 is suppressed, and the gas detection element is suppressed.
- the outer electrode 117 on the first tapered outer peripheral surface (tip surface) 113tl of the protruding portion 113 of the terminal 111 and the first tapered inner peripheral surface (support surface) 135tl of the first stepped portion 135b of the metal shell 131 Poor contact can be suppressed.
- the reliability of the electrical connection between the outer electrode 117 of the gas detection element 111 and the metal shell 131 can be improved. Since the first packing 159 as described above is formed by using the wire packing 159 and plastically deforming the wire packing 159, the gas sensor can be manufactured inexpensively and easily.
- FIG. 7 is a cross-sectional view of the gas sensor 301 according to the present embodiment
- FIG. 8 is a partially enlarged cross-sectional view of the vicinity of the first packing 359 and the plate packing (second packing) 357
- FIG. 9 is a partially enlarged cross-sectional view of a main part near the first packing 359.
- This gas sensor 301 is also an oxygen sensor attached to an exhaust gas pipe of an internal combustion engine to measure the oxygen concentration in exhaust gas.
- the gas sensor 301 includes a bottomed cylindrical gas detection element (held member) 311 having a closed end (lower side in the figure) in the direction of the axis C, and a cylinder that coaxially holds the gas detection element 311 inside. And a metal shell 331 in the shape of a letter.
- the gas detection element 311 has a protruding portion 313 formed in the circumferential direction near the center in the direction of the axis C and protruding radially outward.
- the protruding portion 313 has a first tapered outer peripheral surface (distal end surface (distal end holding surface)) 313tl located on the distal end side and extending from the distal end side to the proximal end side, and a proximal end side located on the proximal end side.
- a second tapered outer peripheral surface (a base end surface (a base side holding surface)) 313t2 that extends toward the distal end side from the other end, and a central outer peripheral surface 313m having the same diameter that connects these surfaces. More specifically, as shown in FIG. 9, the second tapered outer peripheral surface (base end surface (base end holding surface)) 3 13t2 is located on two curved surfaces, that is, on the front end side, , Right) first curved surface 3 13t21 and a second curved surface 313t22 which is connected to the second curved surface 313t22 and located on the base end side and convex inward (to the left in FIG. 9).
- the gas detection element 311 is made of a solid electrolyte having oxygen ion conductivity, for example, a solid electrolyte mainly containing partially stabilized zirconia.
- An inner electrode 315 is formed on substantially the entire inner peripheral surface 311 ⁇ of the gas sensor element 311.
- an outer electrode 317 is formed on substantially the entire front end portion of the outer peripheral surface 311m protruding from the metal shell 331. Further, on the outer electrode 317, an insulating porous protective layer 319 is formed.
- the inner electrode 315 and the outer electrode 317 are mainly made of Pt.
- a heater 312 is inserted inside the gas detection element 311.
- the heater 312 is a rod-shaped ceramic heater, and has a heating member having a resistance heating element formed on a core material mainly composed of alumina.
- the metal shell 331 is made of stainless steel (SUS430), and has a front end 333 (lower side in the figure), a center part 335, and a base end 337 (upper side in the figure).
- the configured through-hole has a shape that tapers from the base end to the tip end.
- the tip 333 has an inner peripheral surface 333 ⁇ having a relatively small diameter. Outside the distal end portion 333 and a central portion 335 described later, a mounting screw portion 333g for mounting the gas sensor 301 to the exhaust gas pipe is formed in the circumferential direction. Further, a protection cap 351 for protecting the tip of the gas detection element 311 is attached to the tip of the tip 333.
- the protective cap 351 is made of stainless steel, has a cylindrical shape with a bottom, and has a large number of ventilation holes 35 lk for introducing exhaust gas in an exhaust pipe into the gas sensor 301.
- the central portion 335 is connected to the inner peripheral surface 333 ⁇ of the distal end portion 333 and has a first tapered inner peripheral surface (support surface) 335tl extending toward the base end side.
- a cylindrical portion 335c connected to the tapered inner peripheral surface 3 35tl and having a central inner peripheral surface 335 ⁇ larger in diameter than the inner peripheral surface 333 ⁇ , and a second taper connected to the central inner peripheral surface 135 ⁇ and expanding toward the base end side.
- a second stepped portion 335d having an inner peripheral surface 335t2. Outside this central portion 335, a gasket 353 made of stainless steel is attached.
- the base end 337 is connected to the second tapered inner peripheral surface 335t2 of the central portion 335, and has an inner peripheral surface 337 ⁇ larger in diameter than the central inner peripheral surface 335 ⁇ .
- the hexagonal flange part (tool engagement part) used when attaching the gas sensor 301 to the exhaust gas pipe is outside the distal end part of the base end part 337. 37r.
- annular metal (SUS430) plate packing 357 (second packing) is arranged, and the first tapered inner peripheral surface is provided. Close contact with 335tl.
- the first tapered outer peripheral surface 313tl of the protruding portion 313 of the gas detecting element 311 provided coaxially with the metal shell 331 is in contact with the plate packing 357. That is, the first stepped portion 335 b of the central portion 335 of the metal shell 331 and the protruding portion 313 of the gas detection element 311 are securely engaged with each other via the plate packing 357.
- the first packing 359 is arranged in a wedge-shaped cross section in an acute gap 320 formed by the second tapered outer peripheral surface 313t2 of the protrusion 313 and the central inner peripheral surface 335 ⁇ of the metal shell 331,
- the second tapered outer peripheral surface 313t2 of the protruding portion 313 and the central inner peripheral surface 335 ⁇ of the main fitting 331 are pressed against each other.
- the distal end portion of the gap 320 (see FIG. 9) has a first curved surface 313t21 on the distal end side of the second tapered outer peripheral surface 313t2 of the projection 313, so that the second tapered outer peripheral surface 313t2
- the angle formed by the center inner peripheral surface 335 ⁇ becomes smaller toward the tip.
- the first packing 359 is provided even to a portion where the angle becomes smaller.
- the first packing 359 is plastically deformed by pressing the line packing toward the front end in the axial direction, and has a wedge-shaped shape.
- the outer peripheral surface 311m on the base end side of the gas detection element 311 and the metal shell 331 is filled with powder mainly composed of talc and filled.
- a sealing layer 361 is formed.
- the annular space formed by the base end side that is, the outer peripheral surface 311m of the gas detection element 311 and the inner peripheral surface 331 ⁇ of the metal shell 331 (the inner peripheral surface 337 ⁇ of the base end 337) is formed.
- a cylindrical insulator 371 made of anoremina is provided.
- a second wire packing 365 which also has a stainless steel (SUS430) force, is arranged.
- the base end of the base end portion 337 of the metal shell 331 covers the second wire packing 365 so as to cover the second wire packing 365.
- the second wire packing 365 is compressed and reinforced.
- the filling sealing layer 361 is compressed in the axial direction, and the gas detection element 311 is held coaxially with the metal shell 331. Further, the sealing force between the outer peripheral surface 311m of the gas detecting element 311 and the inner peripheral surface 331 ⁇ of the metal shell 331 is ensured by the elastic force (stress) of the filling sealing layer 361 generated by compression and force. .
- a cylindrical metal outer cylinder 375 is fixed to the base end 337 of the metal shell 331 from the outside by laser welding.
- a grommet 377 made of rubber is fitted into the base end side opening of the metal outer cylinder 375 and tightened.
- a filter member 379 At the center of the grommet 377, there is arranged a filter member 379 for introducing the atmosphere into the metal outer cylinder 375 while preventing moisture from entering.
- a separator 381 made of insulating alumina ceramic is provided on the tip side of the grommet 377. The sensor output leads, wires 383 and 384, and heater leads 385 and 386 are passed through the separator 381 and the grommet 377.
- the connector portions 387f and 388f of the sensor terminal fittings 387 and 388 electrically connected to the sensor output lead wires 383 and 384, and the heater lead wires 385 and 386 are electrically connected.
- Heater terminal members 391 and 392 to be connected are held insulated from each other.
- the base end of the heater 312 is inserted inside the separator 381, and is held in a state of being electrically connected to the heater terminal members 391, 392.
- One end 387e of the sensor terminal fitting 387 is inserted into the bottomed hole of the sensor detecting element 311 and is electrically connected to the inner electrode 315 of the sensor detecting element 311.
- a tip 388e of the other sensor terminal fitting 388 is electrically connected to an outer electrode 317 formed on the outer periphery of the sensor detection element 311.
- an urging metal fitting 393 for urging the metal outer cylinder 375 and holding the separator 381 inside the metal outer cylinder 375 is mounted.
- the first packing 359 is formed by the second tapered outer peripheral surface of the protrusion 313 of the gas detecting element 311 (the base end surface (the base end holding surface)). ) While being strongly pressed against 313 t2, the inner peripheral surface 331 ⁇ of the metal shell 331 (the central inner peripheral surface 335 ⁇ ) It is strongly pressed. Therefore, even when no external stress acts on the first packing 359, the gas detecting element (held member) 311 can be fixed to the metal shell 331 by the first packing 359.
- the first packing 359 is less likely to be loosened than before, so that the displacement S of the gas detecting element 311 can be suppressed.
- the first packing 359 has a wedge-shaped cross-section by pressing the wire packing inserted into the gap 320 in the axial direction to cause plastic deformation. Since the first packing 359 is pressed so strongly that the packing is plastically deformed and has a wedge shape, the first packing 359 is strongly pressed against the second tapered outer peripheral surface 313t2 and the central inner peripheral surface 335 ⁇ , respectively. Therefore, the gas detection element 311 and the metal shell 331 can be firmly fixed.
- the gap 320 is formed such that the angle between the second tapered outer peripheral surface 313t2 and the inner peripheral surface 331 ⁇ becomes smaller toward the tip end side (the first curved surface 313t21 in FIG. 9). Is provided, the effect of the wedge increases on the tip end side of the first packing 359, and the gas detection element 311 and the metal shell 331 can be more firmly fixed.
- the outer peripheral surface 311m on the proximal end side of the gas detection element 311 and the inner peripheral surface 331 ⁇ of the metal shell 331 (the second tapered inner peripheral surface 335t2 and the proximal end 337 of the central portion 335) And an inner peripheral surface 337 ⁇ ) of the sealing member 361 has a filling sealing layer 361 in which powder is filled in an annular space. Therefore, the sealing performance between the gas detection element 311 and the metal shell 331 can be further improved.
- the first packing 359 described above allows the powder to be removed from the outer peripheral surface (central outer peripheral surface 313 m ) And the inner peripheral surface of the metal shell 331 (the central inner peripheral surface 335 ⁇ ) can be suppressed from reaching the plate packing 357.
- a metal shell 331 molded into a predetermined shape by a known method is prepared.
- a gas detection element 311 is prepared by applying the inner electrode 315, the outer electrode 317, and the like to the solid electrolyte body by a known method and sintering.
- the gas detection element 311 is coaxially inserted into the metal shell 331, and the first tapered outer peripheral surface 313tl of the projection 313 of the gas detection element 311 is brought into contact with the plate packing 357 (element insertion step).
- the plate packing 357 and the gas detection element 311 are pressed in the axial direction with a force of about 3 kN, so that the plate packing 357 becomes the first tapered inner peripheral surface 33 5tl of the stepped portion 335b of the central portion 335. (2nd packing pressing step).
- the wire packing 359 serving as the first packing 359 is inserted into the metal shell 331 in which the gas detection element 311 is inserted, and the wire packing 359 is located on the base end side of the protrusion 313 of the gas detection element 311. It is arranged between the outer peripheral surface 311m of the gas detecting element 311 and the inner peripheral surface 331 ⁇ of the metal shell 331 (gap 320) (line packing insertion step).
- the wire packing 359 is pressed toward the distal end in the axial direction, and the wire packing 359 is plastically deformed in the axial direction to form the first packing 359 (first packing forming step).
- first packing forming step the wire packing 159 is pressed toward the front end in the axial direction with a force of about 5 kN.
- the wire packing 359 is plastically deformed from a circular cross section to a wedge-shaped cross section, and the second tapered outer peripheral surface 313t2 of the protruding portion 313 of the gas detection element 311 and the central inner peripheral surface of the central portion 335 of the metal shell 331. 335 ⁇ .
- a powder mainly composed of talc is applied to the outer peripheral surface 311 m on the base end side of the gas detecting element 311 and the inner peripheral surface of the metal shell 331 by a known method.
- the gap defined by the surface 331 ⁇ is filled.
- the insulator 371 is inserted into the gap and pressed in the axial direction. Thereafter, the wire packing 365 is inserted, and the base end of the base end portion 337 of the metal shell 331 is bent inward to compress in the axial direction to increase the force. Also, a protective cap 351 is attached to the tip of the metallic shell 331, and a gasket 353 is attached to the metallic shell 331.
- sensor output leads 383 and 384 are connected to sensor terminal fittings 387 and 388, respectively, and heater lead wires 385 and 386 are connected to heater terminal fittings 391 and 392, respectively. Then, these are introduced into the separator 381, and the base end of the heater 312 is also introduced into the separator 381. Further, an urging bracket 387 is attached to the outer periphery of the separator 381. After that, The parator 381 and the grommet 377 are moved into the metal outer cylinder 375.
- the metal outer cylinder 375 having the separator 381 and the like is brought into contact with a predetermined position of the metal shell 331 in which the gas detection element 311 is incorporated. Thereafter, the distal end side of the metal outer cylinder 375 is crimped to temporarily connect the metal outer cylinder 375 and the metal shell 331.
- the base end side of the metal outer cylinder 375 is reduced in diameter to fix the separator 381 and the like in the metal outer cylinder 375. Further, the base end side of the metal outer cylinder 375 is caulked to fix the grommet 377. After that, the temporarily connected metal outer cylinder 375 and metallic shell 331 are fixed by laser welding.
- the plate packing (second packing) 357 is pressed in the axial direction, and the plate packing 357 is pressed.
- the metal shell 331 is in close contact with the first tapered inner peripheral surface (support surface) 335tl of the stepped portion 335b. Therefore, the engagement between the plate packing 357 and the metal shell 331 is improved.
- the wire packing 359 is pressed in the axial direction and is plastically deformed, and the wire packing (first packing) 359 is formed into a second tapered outer periphery of the protruding portion 313 of the gas detection element 311.
- the surface 313t2 and the central inner peripheral surface 335 ⁇ of the central part 335 of the metal shell 331 are strongly pressed against each other. Accordingly, the gas detection element (member to be held) 311 can be fixed to the metal shell 331 by the first packing 359 even if no external stress acts on the first packing 359. Therefore, even if the gas sensor 301 is used for a long period of time and the caulking becomes loose, the first packing 359 is less likely to be loosened than before, and the displacement of the gas detecting element 311 can be suppressed. Since the first packing 359 as described above is formed by using the wire packing 359 and plastically deforming the wire packing 359, it is possible to inexpensively and easily manufacture the gas sensor 301.
- FIG. 10 is a cross-sectional view of the gas sensor 401 according to the present embodiment
- FIG. 11 is a partially enlarged cross-sectional view of the vicinity of the first packing 459 and the plate packing (second packing) 457
- the first patch Figure 12 is a partially enlarged cross-sectional view of the main part near the pin 459.
- This gas sensor 401 is also an oxygen sensor attached to an exhaust gas pipe of an internal combustion engine to measure the oxygen concentration in exhaust gas.
- the gas sensor 401 includes a rod-shaped gas detection element 411 extending in the direction of the axis C, a cylindrical element holder (held member) 421 having the gas detection element 411 passed through the opening, and the element holder 421. And a cylindrical metal shell 431 held inside.
- the gas detection element 411 is mainly made of ceramic, and has gas-sensitive characteristics capable of measuring the oxygen concentration in the gas to be measured.
- the gas detection element 411 includes a long plate-shaped oxygen concentration cell element formed in a form having a measurement electrode on the surface of the solid electrolyte layer (the surface exposed to the gas to be measured) and a reference electrode on the back surface;
- a long plate-shaped heater having a heating resistor provided therein is laminated, and a section perpendicular to the axial direction is rectangular.
- One surface of the outer periphery of the rear end portion 412 of the sensor element 411 was electrically connected to a measurement electrode and a reference electrode via a lead in order to extract an electromotive force generated in the oxygen concentration cell element.
- a plurality (two) of electrode terminals 413 are formed, and a plurality of (two) electrode terminals 414 for supplying power to the heating resistor of the heater are formed on the other surface.
- These electrode terminals 413 and 414 are mainly made of Pt.
- the element holder 421 has a first tapered outer peripheral surface (distal end surface (distal end holding surface)) 421tl located on the outer periphery on the distal end side and expanding from the distal end side to the proximal end side, and an outer peripheral surface on the proximal end side. And a second tapered outer peripheral surface (a proximal end surface (a proximal end holding surface)) 421 t2 which extends from the proximal end side to the distal end side, and an outer peripheral surface 421m of the same diameter connecting these surfaces.
- the element holder 421 is made of insulating ceramic. More specifically, as shown in FIG.
- the second tapered outer peripheral surface (the proximal end surface (the proximal end holding surface)) 421t2 has two curved surfaces and one flat surface, that is, is located on the distal end side and located on the outside ( A first curved surface 421t21 convex to the right (in FIG. 12), a second curved surface 421t23 located on the base end side and convex inward (to the left in FIG. 12), and a plane 421t22 connecting these surfaces. It is configured.
- the metal shell 431 is made of stainless steel (SUS430), and has a distal end 433 (lower side in the figure), a central part 435, and a base end 437 (upper side in the figure).
- the configured through-hole has a shape that tapers from the base end to the tip end.
- the tip 433 has an inner peripheral surface 433 ⁇ having a relatively small diameter.
- a protection cap 451 having a double structure for protecting the tip of the gas detection element 411 is mounted.
- the protective cap 451 is made of stainless steel, has a cylindrical shape with a bottom, and has a large number of ventilation holes 451k for introducing exhaust gas in an exhaust pipe into the gas sensor 401.
- the central portion 435 is connected to the inner peripheral surface 433 ⁇ of the distal end portion 433 and has a first tapered inner peripheral surface (support surface) 435tl extending toward the base end side. It is composed of a cylindrical portion 435c that is connected to one tapered inner peripheral surface 4 35tl and has an inner peripheral surface 435 ⁇ that is larger than the inner peripheral surface 433 ⁇ . On the outer periphery of the central portion 435, a mounting screw portion 435g for mounting the gas sensor 401 to the exhaust gas pipe is formed in the circumferential direction.
- the proximal end 437 has an inner peripheral surface 437 ⁇ that is connected to the inner peripheral surface 435 ⁇ of the central portion 435.
- a gasket 453 made of stainless steel is attached to the outer periphery of the proximal end 437 on the distal end side.
- the base end side of the gasket 453 in the base end 437 is a hexagonal flange portion (tool engagement portion) 437r used when the gas sensor 401 is attached to the exhaust gas pipe.
- annular metal (SUS430) plate packing (second packing) 457 is arranged, and the first tapered inner peripheral surface is provided. Close to 435tl.
- the first tapered outer peripheral surface 421tl of the element holder 421 inserted coaxially with the metal shell 431 is in contact with the plate packing 457.
- the first stepped portion 435b of the central portion B435 of the metal shell 431 and the element holder 421 are securely engaged with each other via the plate knocking 457 to be engaged.
- Ni is placed at a position to close the gap between the element holder 421 and the inner peripheral surface 431 ⁇ of the metal shell 431 (the central inner peripheral surface 435 ⁇ of the central portion 435).
- a C-shaped first packing 459 that also has NW2201 (JIS H4551-2002) strength as the main component is arranged. That is, the first packing 459 has a wedge-shaped cross section at an acute gap 420 (see FIG. 12) formed by the second tapered outer peripheral surface 421tl of the element holder 421 and the central inner peripheral surface 435 ⁇ of the metal shell 431.
- the first packing 459 is provided up to a portion where the angle becomes smaller.
- the first packing 459 is plastically deformed by pressing the wire packing toward the distal end in the axial direction, and has a wedge-shaped shape.
- the voids are filled with a powder mainly composed of talc to form a filling sealing layer 461.
- the annular space formed by the base end side that is, the outer peripheral surface 411m of the gas detection element 411 and the inner peripheral surface 431 ⁇ of the metal shell 431 (the inner peripheral surface 437 ⁇ of the base end 437) is formed.
- a cylindrical insulator 471 made of anoremina is provided on the base end of the insulator 471.
- a second wire packing 465 which also has a stainless steel (SUS430) force, is disposed on the base end 437 of the metal shell 431 is covered so as to cover the second wire packing 465. The proximal end is bent inward, and the second wire packing 465 is compressed and reinforced.
- the filling sealing layer 461 is compressed in the axial direction, and the element holder 421 is held coaxially by the metal shell 431.
- the sealing property between the outer peripheral surface 421m of the element holder 421 and the inner peripheral surface 431 ⁇ of the metal shell 431 is secured by the elastic force (stress) of the filling sealing layer 361 generated by compression and force.
- a cylindrical metal outer cylinder 475 is fixed to the base end 437 of the metal shell 431 by laser welding from the outside.
- a grommet 477 made of rubber is fitted and caulked into the base end side opening of the metal outer cylinder 475. The grommet 477 passes through the sensor output lead, wires 483 and 484, and the heater lead, wires 485 and 486, and passes through them.
- a separator 481 made of insulating alumina ceramic is provided. Separator 481 has sensor terminal fittings 487 and 488 electrically connected to sensor output leads 483 and 484 and heater terminal fittings 491 and 492 electrically connected to heater leads 485 and 486, respectively. It is held while being insulated. Further, a base end 412 of the gas detection element 411 is inserted inside the separator 481, and electrode terminals 413 and 414 formed on the base end 412, sensor terminal fittings 487 and 488, and a heater terminal fitting. 491 and 492 are held in an electrically connected state.
- the first packing 459 is strongly pressed against the second tapered outer peripheral surface (base end surface (base end holding surface)) 421t2 of the element holder 421.
- it is strongly pressed against the inner peripheral surface 431 ⁇ of the metal shell 431 (the central inner peripheral surface 435 ⁇ ). Therefore, even when no external stress acts on the first packing 459, the element holder (member to be held) 421 can be fixed to the metal shell 431 by the first packing 459.
- the first packing 449 is less likely to be loosened than before, and the displacement of the element holder 421 can be suppressed.
- the first knocking 459 has a wedge-shaped cross-section by pressing the wire packing inserted into the gap 420 in the axial direction to cause plastic deformation. Since the first packing 459 is pressed so strongly that the packing is plastically deformed and is formed in a wedge shape, it is strongly pressed against the second tapered outer peripheral surface 421t2 and the central inner peripheral surface 435 ⁇ , respectively. Therefore, the element holder 421 and the metal shell 331 can be firmly fixed.
- the distal end side of the gap 420 is configured such that the angle between the second tapered outer peripheral surface 421t2 and the central inner peripheral surface 435 ⁇ becomes smaller toward the distal end side (the first curved surface 421t21 in FIG. 12). Since the packing 459 is provided, the effect of the wedge becomes greater toward the tip end of the first packing 459, and the element holder 421 and the metal shell 331 can be more firmly fixed.
- the powder is placed in an annular space defined by the outer peripheral surface 411m of the gas detection element 411 and the inner peripheral surface 431 ⁇ of the metal shell 431. It has a filling sealing layer 461 that is filled. Therefore, the sealing performance between the gas detection element 411 and the metallic shell 431 can be further improved.
- the powder remains on the outer peripheral surface (the outer peripheral surface 421 m) of the element holder 421 and the metal shell 431. It is possible to suppress reaching the plate packing 457 through the gap between the inner peripheral surface (the central inner peripheral surface 435 ⁇ ).
- a metal shell 431 molded into a predetermined shape by a known method is prepared. Meanwhile, a gas detection element 411 formed by a known method is prepared.
- an element holder 421 in which the gas detection element 411 is inserted is inserted coaxially into the metal shell 431, and the first tapered outer peripheral surface 421tl of the element holder 421 is brought into contact with the plate packing 457 (element holder). Import process).
- the plate packing 457 and the element holder 421 are pressed in the axial direction with a force of about 3 kN, so that the plate packing 457 is aligned with the first tapered inner peripheral surface 435tl of the stepped portion 435b of the central portion 435 and adheres closely. (Second packing pressing step).
- a wire packing 459 to be the first packing 459 is inserted into the metal shell 431, and the wire packing 459 is inserted.
- the wire packing 459 is pressed toward the distal end side in the axial direction, and the wire packing 459 is plastically deformed in the axial direction.
- the first packing 459 is formed in the same manner as in the above embodiments (first packing 459). Forming step).
- the wire packing 459 is plastically deformed from a circular cross section to a wedge-shaped cross section, and the second tapered outer peripheral surface 421t2 of the element holder 421 and the central portion of the metal shell 431 are formed.
- a powder mainly composed of talc is applied to the outer peripheral surface 411m of the gas detection element 411 and the inner peripheral surface 431 ⁇ of the metal shell 431 by a known method. Fill the configured voids.
- the insulator 471 is inserted into the space and pressed in the axial direction.
- the wire packing 465 is inserted, and the base end of the base end 437 of the metal shell 431 is bent inward to compress in the axial direction to apply force. Attach the protective cap 451 to the tip of the metal shell 431.
- sensor output leads 483 and 484 are connected to sensor terminal fittings 487 and 488, respectively, and heater lead wires 485 and 486 are connected to heater terminal fittings 491 and 492, respectively. Then, these are attached to the separator 481, and the base end 412 of the gas detection element 411 is also inserted into the separator 481. Then, the separator 481 and the grommet 477 are inserted into the metal outer cylinder 475 and fixed. Further, the metal outer cylinder 475 is fixed by laser welding the metal shell 331. Thus, the gas sensor 401 is completed.
- the plate packing (second packing) 457 is pressed in the axial direction, and the plate packing 457 is pressed.
- the metal shell 431 is in close contact with the first tapered inner peripheral surface (support surface) 435tl of the stepped portion 435b of the metallic shell 431. Therefore, the contact between the plate packing 457 and the metal shell 431 is improved.
- the wire packing 459 is pressed in the axial direction and is plastically deformed, so that the wire packing (first packing) 459 is brought into contact with the second tapered outer peripheral surface 421t2 of the element holder 421 and the metal shell.
- the element holder (member to be held) 421 can be fixed to the metal shell 431 by the first packing 459 even when no external stress acts on the first packing 459. Therefore, even if the gas sensor 401 is used for a long period of time and the force is loosened, the first packing 459 is less likely to be loosened than before, and the displacement of the element holder 421 can be suppressed. In addition, since the first packing 459 as described above is formed by using the wire packing 459 and plastically deforming the same, the gas sensor 401 can be manufactured at low cost and easily.
- the wire packings 159, 165 and the like may use a ring-shaped (C-shaped) wire packing.
- the annular wire packing has an advantage that the sealing performance can be surely improved.
- annular packing 157 and the like are used as the second packing, but a linear (C-shaped) packing or the like may be used instead.
- the gas detection element 111 and the metal shell 131 are electrically connected by the plate packing 157.
- the present invention is not limited to this, and the first packing 159 may be made of metal.
- the first packing 159 can also provide a force S for electrically connecting the gas detection element 111 and the metal shell 131. Since the first packing 159 is in contact with and pressed against the second tapered outer peripheral surface 113t2 of the protruding portion 113 and the inner peripheral surface 131 ⁇ of the metal shell 131, the first packing With 159, the gas detection element 111 and the metal shell 113 can be electrically connected reliably.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (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)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112004001325T DE112004001325B4 (de) | 2003-07-17 | 2004-07-13 | Gassensor und Methode zur Herstellung des Gassensors |
US10/564,354 US7234341B2 (en) | 2003-07-17 | 2004-07-13 | Gas sensor and method of manufacturing the gas sensor |
JP2005511823A JP4634301B2 (ja) | 2003-07-17 | 2004-07-13 | ガスセンサ及びガスセンサの製造方法 |
US11/798,959 US7506534B2 (en) | 2003-07-17 | 2007-05-18 | Gas sensor and method of manufacturing the gas sensor |
US11/798,960 US7398673B2 (en) | 2003-07-17 | 2007-05-18 | Gas sensor and method of manufacturing the gas sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003198557 | 2003-07-17 | ||
JP2003-198557 | 2003-07-17 |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/564,354 A-371-Of-International US7234341B2 (en) | 2003-07-17 | 2004-07-13 | Gas sensor and method of manufacturing the gas sensor |
US11/798,959 Continuation US7506534B2 (en) | 2003-07-17 | 2007-05-18 | Gas sensor and method of manufacturing the gas sensor |
US11/798,960 Continuation US7398673B2 (en) | 2003-07-17 | 2007-05-18 | Gas sensor and method of manufacturing the gas sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005008233A1 true WO2005008233A1 (ja) | 2005-01-27 |
Family
ID=34074380
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/009971 WO2005008233A1 (ja) | 2003-07-17 | 2004-07-13 | ガスセンサ及びガスセンサの製造方法 |
Country Status (5)
Country | Link |
---|---|
US (3) | US7234341B2 (ja) |
JP (1) | JP4634301B2 (ja) |
CN (1) | CN100588963C (ja) |
DE (1) | DE112004001325B4 (ja) |
WO (1) | WO2005008233A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007121118A (ja) * | 2005-10-28 | 2007-05-17 | Ngk Spark Plug Co Ltd | ガスセンサユニット |
JP2010025731A (ja) * | 2008-07-18 | 2010-02-04 | Ngk Spark Plug Co Ltd | ガスセンサ |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
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DE112004001325B4 (de) * | 2003-07-17 | 2013-07-04 | Ngk Spark Plug Co., Ltd. | Gassensor und Methode zur Herstellung des Gassensors |
US7568378B2 (en) * | 2007-01-15 | 2009-08-04 | Ngk Spark Plug Co., Ltd. | Sensor |
JP2009002846A (ja) * | 2007-06-22 | 2009-01-08 | Denso Corp | ガスセンサ及びその製造方法 |
US7998417B2 (en) * | 2008-08-22 | 2011-08-16 | Board Of Regents, University Of Texas System | Particulate matter sensor with a heater |
DE102009020439B4 (de) * | 2009-05-08 | 2011-05-26 | Knick Elektronische Messgeräte GmbH & Co. KG | Zweipoliger Flüssigkeits-Leitfähigkeitssensor für hohe Hygieneanforderungen |
JP2012174630A (ja) * | 2011-02-24 | 2012-09-10 | Yazaki Corp | シール構造 |
US20120223457A1 (en) * | 2011-03-01 | 2012-09-06 | General Electric Company | Method to manufacture a sensor |
CN102890109B (zh) * | 2012-10-16 | 2014-08-06 | 常州联德电子有限公司 | 一种氮氧传感器及其制作方法 |
US10626776B2 (en) * | 2016-10-10 | 2020-04-21 | Ford Global Technologies, Llc | Method and system for exhaust particulate matter sensing |
JP6824802B2 (ja) | 2017-03-31 | 2021-02-03 | 日本碍子株式会社 | 封止ピン、組立体の製造方法、及びガスセンサの製造方法 |
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2004
- 2004-07-13 DE DE112004001325T patent/DE112004001325B4/de not_active Expired - Fee Related
- 2004-07-13 JP JP2005511823A patent/JP4634301B2/ja not_active Expired - Fee Related
- 2004-07-13 WO PCT/JP2004/009971 patent/WO2005008233A1/ja active Application Filing
- 2004-07-13 CN CN200480019995A patent/CN100588963C/zh not_active Expired - Fee Related
- 2004-07-13 US US10/564,354 patent/US7234341B2/en not_active Expired - Fee Related
-
2007
- 2007-05-18 US US11/798,960 patent/US7398673B2/en not_active Expired - Fee Related
- 2007-05-18 US US11/798,959 patent/US7506534B2/en not_active Expired - Fee Related
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JPS5398895A (en) * | 1977-02-09 | 1978-08-29 | Hitachi Ltd | Exhaust gas sensor |
JPS53105285A (en) * | 1977-02-25 | 1978-09-13 | Hitachi Ltd | Gas density sensor |
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JP2010025731A (ja) * | 2008-07-18 | 2010-02-04 | Ngk Spark Plug Co Ltd | ガスセンサ |
Also Published As
Publication number | Publication date |
---|---|
US20070227229A1 (en) | 2007-10-04 |
DE112004001325T5 (de) | 2006-05-18 |
US20060174690A1 (en) | 2006-08-10 |
US20070220952A1 (en) | 2007-09-27 |
CN100588963C (zh) | 2010-02-10 |
CN1823271A (zh) | 2006-08-23 |
US7506534B2 (en) | 2009-03-24 |
US7398673B2 (en) | 2008-07-15 |
US7234341B2 (en) | 2007-06-26 |
JPWO2005008233A1 (ja) | 2006-09-21 |
JP4634301B2 (ja) | 2011-02-16 |
DE112004001325B4 (de) | 2013-07-04 |
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