WO2012111245A1 - ガスセンサ及びその中間部品 - Google Patents
ガスセンサ及びその中間部品 Download PDFInfo
- Publication number
- WO2012111245A1 WO2012111245A1 PCT/JP2012/000146 JP2012000146W WO2012111245A1 WO 2012111245 A1 WO2012111245 A1 WO 2012111245A1 JP 2012000146 W JP2012000146 W JP 2012000146W WO 2012111245 A1 WO2012111245 A1 WO 2012111245A1
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- WO
- WIPO (PCT)
- Prior art keywords
- connection terminal
- fitting portion
- separator
- end side
- sensor element
- Prior art date
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
-
- 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
- G01N27/4077—Means for protecting the electrolyte or the electrodes
Definitions
- the present invention relates to a gas sensor including a cylindrical sensor element, a connection terminal fitted to the sensor element, and a separator having a through hole into which a part of the connection terminal is inserted, and an intermediate part thereof.
- an oxygen sensor that detects the concentration of oxygen contained in an automobile exhaust gas
- an internal electrode is provided inside the solid electrolyte body formed in a bottomed cylindrical shape, and an external electrode is provided outside the solid electrolyte body. Is known.
- an inner connection terminal that is fitted into the sensor element and is electrically connected to the internal electrode (of the sensor element) is arranged.
- the rear end side of the inner connection terminal Is connected to an output lead wire.
- the inner connection terminal is attached so as to be fitted on the ceramic heater.
- an outer connection terminal (ground connection terminal) that is externally fitted to the sensor element and electrically connected to the external electrode (of the sensor element) is disposed.
- a grounding lead wire is connected to the rear end side of the terminal.
- the above-described outer connection terminal P1 includes a cylindrical outer fitting portion (specifically, an outer fitting portion including left and right wing portions) P2 that contacts the sensor element from the outside, and an outer fitting portion. It is comprised from the elongate part P3 (to which a lead wire is connected) extended in an axial direction from the rear end (upper end of the figure) of P2.
- the inner connection terminal P4 includes a cylindrical inner fitting portion (specifically, an inner fitting portion including left and right wing portions) P5 that contacts the sensor element from the inner side, and an inner fitting portion. It is comprised from the elongate part P6 (to which a lead wire is connected) extended in the axial direction from the rear end of P5.
- extension part P3 of the outer side connection terminal P1 mentioned above and the extension part P6 of the inner side connection terminal P4 are the through-holes P8 each penetrated to the axial direction of the column-shaped separator P7, as shown in FIG.13 (c), It is inserted into P9.
- the extension portion P3 of the outer connection terminal P1 and the extension portion P6 of the inner connection terminal P4 are assembled by being inserted into the through holes P8 and P9 of the separator P7. Therefore, it is necessary to set the dimensions of the through holes P8 and P9 with some allowance.
- the outer connection terminal P1 and the inner connection terminal P4 are slightly in the radial direction with respect to the central axis, as shown in FIG. There is also a problem that positioning is difficult from this point because there is a case of shifting to the inner side or the outer side.
- the extension P3 of the outer connection terminal P1 and the extension P6 of the inner connection terminal P4 are inserted into the through holes P8 and P9 of the separator P7, and the separator P7 and the outer connection terminal P1 are inserted.
- the inner connection terminal P4, etc. in an integrated state (intermediate part state) the outer fitting part P2 of the outer connection terminal P1 is fitted on the sensor element by an automatic machine and the inner fitting part P5 of the inner connection terminal P4 is fitted. It is fitted in the sensor element.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a gas sensor and an intermediate part thereof capable of suitably assembling the gas sensor by accurately positioning the connection terminal on the separator.
- the present invention provides, as a first aspect, a cylindrical sensor element disposed on the front end side, a connection terminal disposed on the rear end side of the sensor element and contacting an electrode of the sensor element, and the sensor In a gas sensor intermediate part used in the manufacture of a gas sensor, the separator having a through-hole into which the rear end side of the connection terminal is inserted and disposed on the rear end side of the element, the connection terminal is connected to the separator.
- the connection terminal includes a cylindrical fitting portion that fits on the sensor element and contacts the electrode on the front end side, and extends from the fitting portion on the rear end side.
- the surface on the tip side of the separator is provided with a projecting portion projecting toward the tip side, and the fitting portion of the connection terminal has its urging force on the side surface in the radial direction of the projecting portion. It is fixed by.
- the position of the connection terminal with respect to the separator is less likely to shift, and the connection terminal can be accurately positioned. Therefore, when manufacturing (assembling) a gas sensor using an intermediate part in which the connection terminal is incorporated in the separator, for example, using an automatic machine, the position of the connection terminal is accurate. The fitting can be performed reliably.
- the fitting portion of the connection terminal is fixed to the side surface of the protruding portion” is not limited to the case where the fitting portion is fixed in contact with the entire side surface of the protruding portion.
- the part may just contact
- the present invention is characterized in that one or more protrusions are formed on the surface of the separator on the tip side.
- connection terminal is a connection terminal (outside connection terminal) that is externally fitted to the sensor element
- connection terminal is a connection terminal (outside connection terminal) that is externally fitted to the sensor element
- connection terminal is a connection terminal (inner connection terminal) fitted inside the sensor element
- the inner diameter of the sensor element ⁇ projection The inner diameter of the portion ⁇ the outer diameter of the connection terminal (before being fixed to the protruding portion) ”.
- the fitting portion of the connection terminal has a notch that cuts the fitting portion along the axial direction and separates the fitting portion into the left and right in the circumferential direction. It is characterized by having.
- Examples of the fitting portion of the connection terminal having this shape include a substantially C-shape that is curved when viewed from the axial direction, and a shape in which a part of a triangular or quadrangular polygon is missing.
- the surface of the separator on the tip side protrudes from the surface to the tip side in the turning direction of the fitting portion of the connection terminal. The rotation prevention part which prevents this is provided.
- the intermediate part of the gas sensor according to any one of claims 1 to 6 is fitted to the sensor element at a fitting portion of the connection terminal. This is a gas sensor.
- the assembly work of the intermediate part can be easily performed, and the fitting portion of the connection terminal (due to the displacement of the connection terminal) can be prevented from being crushed during the assembly. Therefore, it is possible to suppress the occurrence of defective products that cause poor fitting.
- the second aspect of the present invention exemplifies the configuration of the protruding portion.
- the structure of the protrusion can be simplified and is strong.
- the shape of the fitting portion of the connection terminal particularly in the case of a complicated shape
- the shape of the surface on the tip side of the separator arrangement of through holes, insertion holes, etc.
- It can be formed by dispersing the required number of the required locations. That is, it is possible to easily cope with various fitting parts and separator shapes.
- the inner diameter of the fitting portion is smaller than the outer diameter of the protruding portion.
- the fitting portion can be fixed to the outer peripheral surface of the protruding portion by its own (inward) biasing force.
- the outer diameter of the sensor element is larger than the outer diameter of the protruding part. Can be fitted externally.
- the inner diameter of the protruding portion is smaller than the outer diameter of the fitting portion, so that the fitting portion is narrowed
- the fitting portion can be fixed to the inner peripheral surface of the protruding portion by its own (outward) biasing force.
- the inner diameter of the sensor element is smaller than the inner diameter of the protruding portion. can do.
- connection terminal of this shape can be easily manufactured by cutting and bending one metal plate.
- the rotation preventing portion is provided on the surface of the front end side of the separator, when the connection terminal tries to rotate (for example, in the circumferential direction), the rotation can be prevented. it can.
- connection terminal can be accurately positioned, the connection terminal and the sensor element can be reliably fitted. As a result, it is possible to easily perform the assembling work of the intermediate parts, and it is possible to suppress the occurrence of defective products (due to poor fitting due to misalignment of the connection terminals).
- FIG. 2A shows a conventional technique
- FIG. 3A is a perspective view of an outer connection terminal
- FIG. 2B is a perspective view of an inner connection terminal
- FIG. 2C is a plan view of the front end side of the separator
- FIG. (E) is explanatory drawing which shows the front end side of intermediate
- an oxygen sensor that detects the oxygen concentration in the exhaust gas of an automobile will be described as an example of the gas sensor.
- the oxygen sensor of the present embodiment will be described with reference to FIGS.
- FIG. 1 and FIG. 2 the front end side of the oxygen sensor is shown on the lower side, and the rear end side is shown on the upper side.
- the oxygen sensor 1 of the present embodiment includes a cylindrical sensor element 3 that is elongated and closed at the end, a columnar ceramic heater 5 that is inserted into the sensor element 3, and a sensor element.
- 3 is a cylindrical metallic metal shell 7 that is inserted and fixed, a cylindrical metal protector 9 that is coaxially attached to the front end side of the metallic shell 7, and a rear end side of the metallic shell 7.
- a cylindrical metal outer cylinder 11 attached coaxially.
- the ceramic heater 5 is made of, for example, alumina or a resistance heating element.
- a metal packing 13 is provided between the sensor element 3 and the metal shell 7, a metal packing 13, a ceramic support member 15, and talc powder are provided from the front end side for fixing and gas sealing the sensor element 3.
- a filling member 17, a ceramic sleeve 19, and a metal gasket 21 are arranged.
- a ceramic separator 27 having a plurality of through holes 23, 25 is inserted into the through holes 23, 25 to make electrical connection with the sensor element 3.
- a metal outer connection terminal 29 and an inner connection terminal 31 and a fluororesin grommet 33 that closes the rear end side of the outer cylinder 11 are disposed, and the outer connection terminal 29 and the inner connection through the grommet 33 are disposed.
- Lead wires 35 and 37 connected to the connection terminal 31 and lead wires 39 and 41 connected to the ceramic heater 5 are disposed.
- the lead wires 35 to 41 are electrically connected to a sensor control device (not shown) or an electronic control device (ECU) of an automobile provided at a position away from the oxygen sensor 1.
- a sensor control device not shown
- ECU electronice control device
- the sensor element 3 includes a base body 43 in which a solid electrolyte body mainly composed of zirconia is formed in a bottomed cylindrical shape.
- a porous inner electrode (reference electrode) 45 made of Pt or a Pt alloy is formed almost entirely.
- the inner connection terminal 31 contacts the inner electrode 45.
- a porous outer electrode (detection electrode) 47 made of Pt or a Pt alloy is formed on the front end side of the outer peripheral surface of the base body 43 so as to cover the entire surface.
- An electrode lead portion 49 is formed from the outer electrode 47 toward the rear end side, and an annular electrode portion 51 is formed by being connected to the electrode lead portion 49.
- the outer connection terminal 29 contacts the annular electrode portion 51.
- the surface of the outer electrode 47 is covered with a porous electrode protection layer (not shown) made of heat-resistant ceramics in order to prevent poisoning from the exhaust gas.
- the outer connection terminal 29 is fitted on the sensor element 3 at the lower end side thereof to contact the annular electrode portion 51, and at the upper end side, the lead wire 35 is fitted.
- This is a long earthing terminal connected to.
- the outer connection terminal 29 is formed by bending a single metal plate made of, for example, Inconel, and has a cylindrical outer fitting portion 53 having elasticity on the lower end side, and the outer fitting.
- An extension portion 55 extending upward along the axial direction from the upper portion of the portion 53 is provided.
- the outer fitting portion 53 is composed of a pair of left and right wing portions 57 and 59 that are curved in an arc shape (as viewed from the axial direction), and the distal end side in the circumferential direction (direction around the central axis) of both wing portions 57 and 59. Is provided with a gap (slit) 61 that separates the wings 57 and 59 into left and right.
- the outer side of the outer fitting terminal 53 is arranged at almost equal intervals and radially outward (in a direction away from the central axis).
- the guide piece 63 protrudes obliquely toward).
- the extension portion 55 includes a root portion 65 extending upward from the outer fitting portion 53 (specifically, the root portion of the left and right wing portions 57 and 59), and an upper portion extending from the root portion 65 along the axial direction.
- An intermediate portion 67 extending to the intermediate portion 67, and a grip portion 69 provided above the intermediate portion 67 to grip the lead wire 35.
- a protruding piece 71 protrudes outward from the intermediate portion 67.
- the inner connection terminal 31 is formed of a single metal plate made of, for example, Inconel.
- the inner connection terminal 31 is provided with a cylindrical inner fitting portion 73 (fitted to the ceramic heater 5) and fitted into the sensor element 3, and from the rear end side of the inner fitting portion 73 in the axial direction.
- An elongated extension 75 is provided.
- the inner fitting portion 73 is composed of a pair of left and right wing portions 77 and 79 (as viewed from the axial direction) that are curved in an arc shape. A gap 81 for separating 79 is provided.
- the extension portion 75 is provided above the intermediate portion 85, a root portion 83 extending upward from the inner fitting portion 73 toward the outside, an intermediate portion 85 extending upward along the axial direction from the root portion 83, and the intermediate portion 85. And a gripping portion 87 for gripping the lead wire 37. Note that a protruding piece 89 protrudes outward from the intermediate portion 85.
- the separator 27 is a cylindrical member made of alumina having electrical insulation and having a flange 91 on the outer periphery, and the pair of the separators 27 is symmetrical with respect to the central axis in the axial direction.
- Has a long insertion hole 97 (the rear end side is closed).
- the through hole 23 is a hole into which the extension 55 of the outer connection terminal 29 is inserted. As shown in FIG. 4B, the through hole 23 has a substantially trapezoidal cross-sectional shape perpendicular to the axial direction. A central hole 99, a slit hole 101 extending in a slit shape from the central hole 99 in the vertical direction of the figure, and a convex hole 103 protruding outward from the central hole 99.
- the wide intermediate portion 67 of the extension portion 55 is fitted into the slit hole portion 101, and the protruding piece 71 is fitted into the convex hole portion 103.
- the other through-hole 25 has a similar shape.
- the protrusions (first to fourth protrusions) 105 to 111 are formed on the surface of the separator 27 on the tip side so as to protrude from the surface to the tip side.
- the protrusions 105 to 111 protrude in the form of columns at regular intervals in the circumferential direction between the through holes 23, 25, 93, and 95 around the central axis.
- the inner peripheral surfaces of the protrusions 105 to 111 have a circular shape with an inner diameter of N
- the outer peripheral surfaces of the protrusions 105 to 111 have a circular shape with an outer diameter of G. It is set to be.
- FIG. 5A shows an enlarged view of the state in which the outer connection terminal 29, the inner connection terminal 31 and the like are assembled to the separator 27 (intermediate component 113).
- the outer fitting portion 53 of the outer connection terminal 29 is disposed at the lower end of the separator 27, and the extension portion 55 of the outer connection terminal 29 is inserted into the through hole 23 of the separator 27.
- the inner fitting portion 73 of the inner connection terminal 31 is disposed at the lower end of the separator 27, and the extension portion 75 of the inner connection terminal 31 is inserted into the through hole 25 of the separator 27.
- the inner fitting portion 73 of the inner connection terminal 31 is fitted on the rear end side of the ceramic heater 5 so as to be integrated, and the rear end of the ceramic heater 5 is inserted into the insertion hole 97 of the separator 27.
- the left and right wing portions 57 and 59 of the outer connection terminal 29 are externally fitted to the outer side surfaces (outer peripheral surfaces) in the radial direction of the protruding portions 105 to 111. These are fixed so as not to move in the circumferential direction and the radial direction by their own elasticity (by being expanded from the outer peripheral surfaces of the protrusions 105 to 111).
- left and right wing portions 77 and 79 of the inner connection terminal 31 are fitted into the inner side surfaces (inner peripheral surfaces) in the radial direction of the projecting portions 105 to 111 and are narrower than the inner peripheral surfaces of the projecting portions 105 to 111. It is fixed so as not to move in the circumferential direction and the radial direction by its own elasticity.
- each part are set so as to satisfy the following condition (1).
- Inner diameter of external connection terminal (before fixing to protrusion) ⁇ Outer diameter of protrusion> ⁇ Outer diameter of sensor element ...
- the outer connection terminal 29 is fixed and positioned on the outer peripheral surface of the protruding portions 105 to 111 of the separator 27.
- the diameter of the outer connection terminal 29 is expanded, and the protrusions 105 to 111 are released from being fixed.
- the dimensions of the respective parts are set so as to satisfy the following condition (2).
- Inner diameter of sensor element ⁇ Inner diameter of protruding part ⁇ Outer diameter of inner connection terminal (before fixing to protruding part) ...
- the inner connection terminal 31 is fixed and positioned on the inner peripheral surface of the projecting portions 105 to 111 of the separator 27, and the subsequent assembly is performed.
- the diameter of the inner connection terminal 31 is reduced, and the protrusions 105 to 111 are released from being fixed.
- FIG. 6 shows a state after the grommets 33 and the like are crimped.
- a protector 9 is joined to the tip of the metal shell 7, and the sensor element 3 is packed in the cylinder of the metal shell 7 with a packing 13, a support member 15, a filling member 17, a sleeve 19, and a gasket 21. Clamp together and fix. Thereby, the intermediate assembly 115 at the front end side is configured.
- the outer connection terminal 29 and the inner connection terminal 31 are each formed in the shape shown in FIG. 3 by punching a conductive plate material. After that, as shown in FIG. 6, the core wires of the lead wires 35 and 37 are fixed to the holding portions 69 and 87 of the outer connection terminal 29 and the inner connection terminal 31 by caulking.
- the inner fitting portion 73 is fitted on the rear end side of the ceramic heater 5 so that the inner connection terminal 31 and the ceramic heater 5 are integrated.
- the lead wires 39 and 41 are also connected to the ceramic heater 5.
- the outer connection terminal 29, the inner connection terminal 31, and the ceramic heater 5 are integrated with the separator 27 to form the intermediate component 113.
- the extension 55 of the outer connection terminal 29 is inserted into the through hole 23 of the separator 27
- the extension 75 of the inner connection terminal 31 is inserted into the through hole 25 of the separator 27
- the rear end portion of the ceramic heater 5 Parts connected to the lead wires 39, 41
- the rear end side of each member is drawn into the separator 27 so that the outer connection terminal 29 and the inner connection terminal 31.
- the ceramic heater 5 and the separator 27 are integrated.
- the separator 27 is inserted into the outer cylinder 11, and the lead wires 35 to 41 are inserted into the grommet 33, and then the grommet 33 is fitted into the rear end side of the outer cylinder 11.
- the intermediate assembly 117 on the rear end side is configured.
- the intermediate assembly 113 on the front end side holding the sensor element 3 etc. in the metal shell 7 and the rear end side holding the outer connection terminal 29, the inner connection terminal 31, the ceramic heater 5 etc. in the outer cylinder 11.
- the intermediate assembly 117 is manufactured in a separate process.
- the intermediate assemblies 115 and 117 are combined with each other so that their axial directions coincide.
- the rear-end-side intermediate assembly 117 is disposed on the lower side upside down with respect to FIG. 6, and the front-end-side intermediate assembly 115 is disposed above the rear-end-side intermediate assembly 117 from above. Is assembled by an automatic machine.
- the intermediate assembly 117 on the rear end side is fixed to an assembly device or the like with the ceramic heater 5 facing upward, and the intermediate assembly 115 on the front end side is held above the intermediate assembly. Then, the intermediate assembly 115 on the front end side is pushed down from above so that the ceramic heater 5 is inserted into the hole inside the sensor element 3, and the inner fitting portion 73 of the inner connection terminal 31 is fitted into the sensor element 3. At the same time, the outer fitting portion 53 of the outer connection terminal 29 is fitted on the rear end side of the sensor element 3 and press-fitted to a predetermined fixed position.
- the front end of the outer cylinder 11 is externally fitted to the rear end of the metal shell 7 and the periphery thereof is crimped. Further, the intermediate portion of the separator 27 and the portion of the outer cylinder 11 corresponding to the grommet 33 are crimped, and then laser welding is performed on the outer fitting portion at the tip of the outer tube 11.
- the oxygen sensor 1 is completed by integrating the intermediate assemblies 115 and 117 on the front end side and the rear end side.
- the outer connection terminal 29 is The separator 27 is accurately positioned by fixing the protrusions 105 to 111 on the outer peripheral surface, and the outer connection terminal 29 is externally fitted to the sensor element 3 when the intermediate assemblies 115 and 117 are assembled. By doing so, the diameter is expanded and the protrusions 105 to 111 are released from being fixed.
- the inner connection terminal 31 is connected to the protruding portion 105 of the separator 27 before the oxygen sensor 1 is assembled.
- the inner connection terminal 31 is fitted into the sensor element 3 when the two intermediate assemblies 115 and 117 are assembled. The diameter is reduced, and the protrusions 105 to 111 are released from fixing.
- the front end side surface of the separator 27 is provided with the protrusions 105 to 111 protruding to the front end side, and the outer connection terminals 29 are provided on the outer peripheral surfaces of the protrusions 105 to 111.
- the outer fitting portion 53 is fixed by its own urging force, and the inner fitting portion 73 of the inner connection terminal 31 is fixed to the inner peripheral surface of the projecting portions 105 to 111 by its own urging force.
- the positions of the outer connection terminal 29 and the inner connection terminal 31 with respect to the separator 27 are less likely to be displaced than in the conventional case, and the outer connection terminal 29 and the inner connection terminal 31 can be accurately positioned.
- the oxygen sensor 1 when the oxygen sensor 1 is assembled using an automatic machine using the intermediate part 113 in which the outer connection terminal 29 and the inner connection terminal 31 are incorporated in the separator 27, the outer connection terminal 29 and the inner connection terminal 31 are used. Therefore, the outer connection terminal 29 and the inner connection terminal 31 can be reliably fitted to the sensor element 3 without being damaged. Thereby, the assembling work of the intermediate part 113 can be easily performed, and generation of defective products can be suppressed.
- the protruding portions 105 to 111 are provided in four locations so as to follow the shapes of the fitting portion 53 of the outer connection terminal 29 and the inner fitting 73 of the inner connection terminal 31. Therefore, even when a large protrusion cannot be formed due to the shape of the front end side of the separator 27 (when there is no space), the outer connection terminal 29 and the inner connection terminal 31 can be sufficiently positioned.
- the separator 121 used in the oxygen sensor of the present embodiment has a cylindrical shape, as in the first embodiment. (Through the same shape as 1), through holes 123 to 129 are formed at four positions.
- each of the protrusions 131 to 137 is not an integral member as in the first embodiment, and the planar shape thereof is formed in a concentric manner with the central axis of the separator 121 as the center. It is composed of two members. That is, each of the protrusions 131 to 137 includes an arc-shaped inner wall 139 on the inner side in the radial direction, and an arc-shaped outer wall 141 on the outer side of the inner wall 139 with an arc-shaped gap interposed therebetween.
- the outer fitting portion 145 of the outer connection terminal 143 is fixed and positioned on the outer peripheral surface of the outer wall 141 of each of the protruding portions 131 to 137 by its own elasticity. ing.
- the inner fitting portion 149 of the inner connection terminal 147 is fixed and positioned on the inner peripheral surface of the inner wall 139 of each of the protrusions 131 to 137 by its own elasticity. Also according to this embodiment, the same effects as those of the first embodiment can be obtained.
- the separator 151 used in the oxygen sensor of the present embodiment has a cylindrical shape as in the first embodiment, and has an axial direction (having the same shape as in the first embodiment).
- Through holes 153 to 159 are opened at four locations.
- protrusions 161 to 167 are provided at four positions in the circumferential direction at substantially equal intervals. Also in this embodiment, the outer fitting portion 171 of the outer connection terminal 169 is fixed and positioned on the outer peripheral surface of each of the projecting portions 161 to 167 by its own elasticity.
- the inner fitting portion 175 of the inner connection terminal 173 is fixed and positioned on the inner peripheral surface of each of the projecting portions 161 to 167 by its own elasticity.
- the outer connection terminal 169 rotates in the circumferential direction at both circumferential ends of the outer fitting portion 171 of the outer connection terminal 169 on the surface of the separator 151 on the front end side (front side in the figure).
- rotation preventing portions 177 and 179 are erected. That is, when the outer fitting portion 171 receives a turning force, the tip of the outer fitting portion 171 is configured to contact the rotation preventing portions 177 and 179.
- the rotation preventing portions are provided at both ends in the circumferential direction of the inner fitting portion 175 of the inner connection terminal 173 in order to prevent the inner connection terminal 173 from rotating in the circumferential direction.
- 181 and 183 are erected.
- the distal end of the inner fitting portion 175 is configured to contact the rotation preventing portions 181 and 183.
- the positions of the rotation preventing portions 177 to 183 in the plane are determined when the outer fitting portion 171 of the outer connection terminal 169 and the inner fitting portion 175 of the inner connection terminal 173 are deformed when the oxygen sensor is assembled. The position is set so that it does not get in the way.
- the same effects as those of the first embodiment are provided, and the rotation preventing portions 177 to 183 that prevent the rotation of the outer connection terminal 169 and the inner connection terminal 173 are provided.
- the position of the inner connection terminal 173 is difficult to shift and the positioning accuracy is high.
- the oxygen sensor of the present embodiment is greatly different from the first embodiment in that there is no ceramic heater (a heater-less point).
- the oxygen sensor 201 of this embodiment includes a sensor element 203, a metal shell 205, a protector 207, an outer cylinder 209, and the like, as in the first embodiment. Further, on the rear end side of the sensor element 203, a separator 215 having a pair of through holes 211 and 213, and an outer connection terminal inserted into each of the through holes 211 and 213 and electrically connected to the sensor element 3 217 and the inner connection terminal 219, and a grommet 221 that closes the rear end side of the outer cylinder 209, and the lead wire 223 that penetrates the grommet 221 and is connected to the outer connection terminal 217 and the inner connection terminal 219, 225 is disposed.
- a separator 215 as shown in FIGS. 11A and 11B is used.
- the separator 215 has a cylindrical shape as in the first embodiment, and the through holes 211 and 213 are opposed to each other in the axial direction at two locations. Further, between the through holes 211 and 213, a pair of (planar shape) arc-shaped protrusions (first and second protrusions) 227 and 229 are provided to face each other. That is, the outer peripheral surfaces and inner peripheral surfaces of the projecting portions 227 and 229 are formed so that the planar shapes thereof are concentric circles with the central axis of the separator 215 as the center.
- the outer fitting portion 231 of the outer connection terminal 217 is fixed and positioned on the outer peripheral surface of each protruding portion 227, 229 by its own elasticity.
- the inner fitting portion 233 of the inner connection terminal 219 is fixed and positioned on the inner peripheral surface of each of the projecting portions 227 and 229 by its own elasticity. Also according to this embodiment, the same effects as those of the first embodiment can be obtained.
- this invention is not limited to the said Example at all, As long as it belongs to the technical scope of this invention, it can take a various form.
- the separator 241 includes an integral protruding portion 249 in which a pair of arc-shaped protruding pieces 243 and 245 are connected by a connecting portion 247 therebetween. In this case, there is an advantage that the protruding portion 249 is strong.
- the shape of the protruding portion is not limited to a cylinder or a prism, and may be a cone or a pyramid (the tip side is thin or thick).
- the side surface is not a flat surface, and a convex portion is formed in the radial direction from the side surface, and the outer fitting portion of the outer connection terminal and the inner fitting portion of the inner connection terminal are in contact with and fixed to the tip of the convex portion. May be.
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Abstract
Description
この酸素センサのセンサ素子としては、下記特許文献1、2に記載の様に、有底筒状に形成した固体電解質体の内側に内部電極を備えるとともに、固体電解質体の外側に外部電極を備えたものが知られている。
(6)本発明は、第6態様として、前記セパレータの先端側の表面には、前記接続端子の嵌合部の回動方向において前記表面から先端側に突出して、前記嵌合部の回動を防止する回動防止部を備えたことを特徴とする。
(7)本発明は、第7態様として、前記請求項1~6のいずれか1項に記載のガスセンサの中間部品が、前記接続端子の嵌合部にて前記センサ素子に嵌合してなることを特徴とするガスセンサである。
a)まず、本実施例の酸素センサについて、図1及び図2に基づいて説明する。なお、図1及び図2では、酸素センサの先端側が下方側で、後端側が上方側となるように示してある。
以下、主要な各構成について詳細に説明する。
この基体43の内周面には、ほぼ全面にわたって、PtまたはPt合金からなる多孔質状の内側電極(基準電極)45が形成されている。なお、内側電極45に前記内側接続端子31が接触する。
同図に示す様に、セパレータ27の下端に、外側接続端子29の外嵌部53が配置され、セパレータ27の貫通孔23に、外側接続端子29の延長部55が挿入されている。同様に、セパレータ27の下端に、内側接続端子31の内嵌部73が配置され、セパレータ27の貫通孔25に、内側接続端子31の延長部75が挿入されている。
(突出部に固定前の)外側接続端子の内径<突出部の外径<センサ素子の外径…(1)
これにより、後述する様に、酸素センサ1の組付け前には、外側接続端子29は、セパレータ27の突出部105~111の外周面に固定されて位置決めされ、その後の組付けの際には、外側接続端子29がセンサ素子3に外嵌することにより、外側接続端子29の径が広がって、突出部105~111の固定から解放される。
センサ素子の内径<突出部の内径<(突出部に固定前の)内側接続端子の外径…(2)
これにより、後述する様に、酸素センサ1の組付け前には、内側接続端子31は、セパレータ27の突出部105~111の内周面に固定されて位置決めされ、その後の組付けの際には、内側接続端子31がセンサ素子3に内嵌することにより、内側接続端子31の径が狭くなって、突出部105~111の固定から解放される。
図6に示す様に、主体金具7の先端にプロテクタ9を接合し、その主体金具7の筒内にて、前記センサ素子3を パッキン13、支持部材15、充填部材17、スリーブ19、ガスケット21などとともに加締めて固定する。これにより、先端側の中間組立体115が構成される。
その後、前記図6に示す様に、外側接続端子29及び内側接続端子31の各把持部69、87に各リード線35、37の芯線を加締めにより固定する。また、内側接続端子31については、その内嵌部73をセラミックヒータ5の後端側に外嵌し、内側接続端子31とセラミックヒータ5とを一体化する。なお、セラミックヒータ5にも、各リード線39、41が接続されている。
具体的には、外側接続端子29の延長部55をセパレータ27の貫通孔23に挿入し、内側接続端子31の延長部75をセパレータ27の貫通孔25に挿入し、セラミックヒータ5の後端部分(リード線39、41に接続される部分)を、セパレータ27の挿通孔97に挿入して、各部材の後端側をセパレータ27内に引き込む様にして、外側接続端子29及び内側接続端子31及びセラミックヒータ5とセパレータ27とを一体化する。
抑制することができる。
本実施例は、前記実施例1とは、セパレータの形状が異なるので、セパレータについて説明する。
特に本実施例では、各突出部131~137は、実施例1の様にそれぞれが一体の部材ではなく、その平面形状が、セパレータ121の中心軸を中心とする同心円状に2重に形成された二体の部材から構成されている。つまり、各突出部131~137は、径方向における内側に円弧状の内壁139を備えるとともに、内壁139の外側に円弧状の間隙を介して円弧状の外壁141を備えている。
本実施例によっても、前記実施例1と同様な効果を奏する。
本実施例は、前記実施例1とは、セパレータの形状が異なるので、セパレータについて説明する。
本実施例においても、外側接続端子169の外嵌部171は、自身の弾性によって、各突出部161~167の外周面に固定されて位置決めされている。
特に本実施例では、セパレータ151の先端側(同図手前側)の表面において、外側接続端子169の外嵌部171の周方向の両先端には、外側接続端子169の周方向への回動を防止するために回動防止部177、179が立設されている。つまり、外嵌部171が回動する力を受けた場合に、外嵌部171の先端が回動防止部177、179に当たるように構成されている。
本実施例の酸素センサは、前記実施例1とは、セラミックヒータが無い点(ヒータレスである点)が大きく異なる。
また、前記センサ素子203の後端側には、一対の貫通孔211、213を有するセパレータ215と、各貫通孔211、213に挿入されて前記センサ素子3との電気的接続を行う外側接続端子217及び内側接続端子219と、外筒209の後端側を閉塞するグロメット221とが配置されるとともに、グロメット221を貫いて、外側接続端子217及び内側接続端子219に接続されたリード線223、225が配設されている。
このセパレータ215は、前記実施例1と同様に、円柱形状であり、その軸方向には、前記貫通孔211、213が対向して2箇所に開けられている。また、両貫通孔211、213の間には、一対の(平面形状が)円弧状の突出部(第1、第2突出部)227、229が対向して設けられている。つまり、両突出部227、229の外周面及び内周面は、その平面形状が、セパレータ215の中心軸を中心とした同心円となるように形成されている。
本実施例によっても、前記実施例1と同様な効果を奏する。
(1)例えば、前記実施例4においては、図12に示すセパレータ241を用いてもよい。このセパレータ241は、一対の円弧状の突出片243、245が、その間の接続部247によって接続された一体の突出部249を備えたものである。この場合には、突出部249が丈夫であるという利点がある。
3、203…センサ素子
23、25、93、95、123、125、127、129、153、155、157、159、211、213…貫通孔
27、121、151、215、241…セパレータ
29、143、169、217…外側接続端子
31、147、173、219…内側接続端子
53、145、171、231…外嵌部
73、149、175、133…内嵌部
55、75…延長部
61、81…切り欠き
105、107、109、111、131、133、135、137、161、163、165、167、227、229、249…突出部
177、179、181、183…回動防止部
Claims (7)
- 筒状のセンサ素子と、該センサ素子の後端側に配置されて該センサ素子の電極に接触する接続端子と、前記センサ素子より後端側に配置されて前記接続端子の後端側が挿入される貫通孔を有するセパレータと、を備えたガスセンサの製造の際に用いられるガスセンサの中間部品において、
前記セパレータに前記接続端子を一体に組み付けた構成を有し、
前記接続端子は、先端側に前記センサ素子に嵌合して前記電極と接触する筒状の嵌合部を備えるとともに、後端側に前記嵌合部から伸びて前記セパレータの貫通孔に嵌挿される延長部を備え、
且つ、前記セパレータの先端側の表面には、該先端側に突出する突出部を備えるとともに、
前記接続端子の嵌合部が、自身の付勢力によって前記突出部の径方向における側面に固定されていることを特徴とするガスセンサの中間部品。 - 前記セパレータの先端側の表面に、1又は複数の突出部が形成されていることを特徴とする請求項1に記載のガスセンサの中間部品。
- 前記接続端子が、前記センサ素子に外嵌する接続端子である場合には、その嵌合部において、「(突出部に固定前の)接続端子の内径<突出部の外径<センサ素子の外径」の条件を満たすことを特徴とする請求項1又は2に記載のガスセンサの中間部品。
- 前記接続端子が、前記センサ素子に内嵌する接続端子である場合には、その嵌合部において、「センサ素子の内径<突出部の内径<(突出部に固定前の)接続端子の外径」の条件を満たすことを特徴とする請求項1又は2に記載のガスセンサの中間部品。
- 前記接続端子の嵌合部には、該嵌合部を軸方向に沿って切り欠いて該嵌合部を周方向の左右に分離する切り欠きを有することを特徴とする請求項1~4のいずれか1項に記載のガスセンサの中間部品。
- 前記セパレータの先端側の表面には、前記接続端子の嵌合部の回動方向において前記表面から先端側に突出して、前記嵌合部の回動を防止する回動防止部を備えたことを特徴とする請求項1~5のいずれか1項に記載のガスセンサの中間部品。
- 前記請求項1~6のいずれか1項に記載のガスセンサの中間部品が、前記接続端子の嵌合部にて前記センサ素子に嵌合してなることを特徴とするガスセンサ。
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