JP5255076B2 - Gas sensor - Google Patents

Description

  The present invention relates to a gas sensor that detects the concentration of a specific component in a gas to be measured.

Conventionally, a gas sensor for detecting the concentration of a specific component (oxygen, NOx, etc.) in exhaust gas of an internal combustion engine has been used. FIG. 8 shows a cross-sectional structure of a conventional gas sensor 1000.
The gas sensor 1000 is provided in a surrounding shape on the plate-shaped gas sensor element 10 extending in the axial direction O, a cylindrical metal shell 138 for fixing the gas sensor element 10, and a rear end (upper end in the drawing) side of the metal shell 138. A metal protective cylinder (outer cylinder) 144, a separator 166 disposed in the protective cylinder 144, five connection terminals 110 (four shown in FIG. 8) held in the separator 166, and a connection An elastic member having five lead wires 146 connected to the rear end side of the terminal 110 and drawn out to the rear end, and a through hole 161 that is disposed in the protective cylinder 144 on the rear end side of the separator 166 and through which the lead wire 146 is inserted. And a member (rubber cap) 150.
The gas sensor element 10 is composed of a solid electrolyte body and a pair of electrodes arranged on the solid electrolyte body, and one or more (a total of five) electrode pads 10a and 10b are provided on both surfaces of the rear end side of the gas sensor element 10, respectively. Has been placed. The front end side of the connection terminal 110 is electrically connected to one of the electrode pads 10 a and 10 b, and the rear end side of the connection terminal 110 is electrically connected to the front end of the lead wire 146. The separator 166 is provided with a contact insertion hole 168 surrounding the rear end portion of the gas sensor element 10, and the distal end side of each connection terminal 110 is disposed facing the insertion hole 168 so as to contact the electrode pads 10 a and 10 b. It has become.

  Here, the connection terminal 110 is usually formed in a plate shape extending in the axial direction, but the lead wire 146 connected to the position of the electrode pads 10a and 10b with which the tip of the connection terminal 110 contacts and the rear end of the connection terminal 110 is connected. (The position of the through hole 161 of the elastic member 150) is deviated (different). For this reason, the technique which provided the intermediate part by curving a connection terminal to the thickness direction of a board surface is disclosed (refer patent document 1). Further, a technique is disclosed in which the vicinity of the center in the axial direction of the connection terminal is bent to intersect the plate surface directions on the front end side and the rear end side of the connection terminal (see Patent Document 2).

Japanese translation of PCT publication 2000-500876 (FIG. 4) Japanese Patent Laying-Open No. 2005-91223 (FIG. 3)

By the way, when the gas sensor having the above-described configuration is manufactured, after passing each lead wire 146 through each through-hole 161 of the elastic member 150, the sealing cylinder portion 144a near the rear end of the protective cylinder 144 is reduced in diameter from the outer peripheral surface. Caulking (Happo-maru caulking) compresses the sealing cylinder portion 144a in the radial direction and holds the seal in the through-hole 161 and the like. And the sealing performance of the lead wire 146 improves by compressing the lead wire 146 inserted in the cylindrical elastic member 150 as uniformly and efficiently as possible. For this reason, the through-holes 161 of the elastic member 150 are arranged at equiangular intervals or close to them on a circumference (virtual circumference) concentric with the cross section (circle) of the elastic member 150 and as close to the outer circumference as possible. Preferably it is provided.
In this way, the lead wires 146 need to be arranged on the virtual circumference of the through-hole 161, whereas the electrode pads 10 a and 10 b are arranged side by side along the plate surface of the gas sensor element 10. Therefore, the front end side of the connection terminal 110 is arranged side by side in the insertion hole 168 so as to correspond to the electrode pads 10a and 10b, while the rear end side of the connection terminal 110 corresponds to the lead wire 146 on the virtual circumference. Will be arranged side by side.

In this case, as described in Patent Document 1 described above, the connection terminal is curved in the thickness direction or formed in a crank shape in the plate surface direction, so that the positions of the front end side and the rear end side of the connection terminal are It corresponds to the deviation. However, when the connection terminal is bent in the thickness direction, the connection terminal can be bent in the thickness direction and the position can be finely adjusted, but the connection terminal is bent (deformed) in the plate surface direction. There is a problem that fine adjustment of the position in the plate surface direction is difficult. If the connection terminal is forcibly bent, the connection terminal may be broken, and if the connection terminal cannot be deformed following the position of the through hole 161, an excessive deformation stress may be applied to the lead wire 146. This is the same even when the through-holes 161 are not arranged on the virtual circumference, and may be caused if the positions of the front end side and the rear end side of the connection terminal are shifted.
Also, as described in Patent Document 2, when the connection terminal is bent in the axial direction, stress concentration may occur in the screw bending portion due to vibration during operation of the vehicle, and the terminal may be broken.

  In view of the above, an object of the present invention is to provide a gas sensor including a connection terminal that can be reliably connected to the electrode pad of the gas sensor element and a lead wire while being deformed in accordance with a positional shift.

In order to solve the above-mentioned problems, a gas sensor according to the present invention has a plate shape extending in the axial direction, and includes a gas sensor element in which one or more electrode pads are arranged on both sides of the rear end of the gas sensor element, and the electrode pads. A plurality of connection terminals, each of which is electrically connected to the front end side thereof, a separator that holds the plurality of connection terminals in a state of being separated from each other, and an electrical connection to the rear end side of the connection terminal, respectively A gas sensor comprising: a plurality of lead wires extending toward the rear end side; and an elastic member disposed on the rear end side of the separator and having a plurality of through holes through which the lead wires are inserted in the axial direction. The front end side of the connection terminal forms a plate-like element connection portion connected to the electrode pad, and the rear end side of the connection terminal is connected to the lead wire. Forming a lead wire connecting portion, so that the orientation of the principal surface and the principal surface of the lead wire connecting portions of the element connection portion intersect each main faces are connected via a connecting portion.
According to this gas sensor, since the lead wire connecting portion on the rear end side of the connecting portion and the element connecting portion on the front end side of the connecting portion of the connecting terminal are bent (deformed) in the intersecting directions, the connecting terminal Can bend (deform) in any direction perpendicular to the axial direction as a whole. Therefore, the connection terminal is deformed corresponding to the displacement between the electrode pad of the gas sensor element and the lead wire, and the connection terminal can be reliably connected to the electrode pad and the lead wire.

It is preferable that a first bent portion that shifts from the rear end portion in a direction perpendicular to the axial direction is provided in the element connection portion on the front end side from the rear end portion of the element connection portion.
When the first bent portion is provided in the element connecting portion, the position of the tip portion can be shifted (offset) from the rear end portion without forcibly bending the entire element connecting portion, and the position of the electrode pad and the lead wire is shifted. Can cope better.

The lead wire connecting portion on the rear end side from the tip portion of the lead wire connecting portion may be provided with a second bent portion that shifts from the tip portion in a direction perpendicular to the axial direction.
If the second bent portion is provided in the lead wire connecting portion, the position of the rear end portion can be shifted (offset) from the tip portion without forcibly bending the entire element connecting portion, and the position of the electrode pad and the lead wire can be changed. It can cope with the deviation better.

The connection terminals may all have the same shape.
In the conventional gas sensor, the shapes of the plurality of connection terminals are different from each other in order to cope with the positional deviation between the electrodes and the lead wires. However, in the present invention, the connection terminals bend in all directions perpendicular to the axial direction. Since the amount of deformation and the degree of freedom of deformation are large, even if the shape of the connection terminal is the same, it is possible to cope with the displacement of the position of the electrode pad and the lead wire, and the common parts Cost reduction.

  According to the present invention, the electrode pad can be deformed in any direction perpendicular to the axial direction, and is arranged side by side along the plate surface of the gas sensor element, and the lead wire arranged on the circumference along the through hole of the elastic member. Thus, it is possible to obtain a gas sensor provided with a connection terminal that can be reliably connected to each other while being deformed corresponding to the positional deviation.

It is sectional drawing which follows the axial direction of the gas sensor which concerns on embodiment of this invention. It is a perspective view which shows the arrangement | positioning state of the elastic member in an outer cylinder, a connection terminal, a 1st separator, and a main metal fitting. It is a perspective view which shows the structure of a connection terminal. FIG. 4 is a cross-sectional view of the connection terminal in the vicinity of the coupling portion taken along the line AA in FIG. 3. It is a top view of an elastic member. It is a top view which shows arrangement | positioning of the electrode pad of the gas sensor element in a 1st separator. It is sectional drawing which shows the position shift | offset | difference of an electrode pad and the lead wire located in a line along a through-hole. It is sectional drawing in alignment with the axial direction of the conventional gas sensor.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 shows a cross-sectional view along an axial direction O (longitudinal direction) of a gas sensor (oxygen sensor) 200 according to an embodiment of the present invention. The oxygen sensor 200 includes a cylindrical metal shell 138 having a screw portion 139 for fixing to an exhaust pipe formed on the outer surface, and a plate extending in the axial direction O (longitudinal direction of the oxygen sensor 200: vertical direction in the figure). An oxygen sensor element (gas sensor element) 10 having a shape, and a first separator 166 disposed so that an inner wall surface of a contact insertion hole 166a penetrating in the axial direction O surrounds the periphery of the rear end portion of the oxygen sensor element; The five connecting terminals 30 (three are shown in FIG. 1) that are held apart from each other by the separator 166 are electrically connected to the rear end side of the connecting terminals 30. Five lead wires 146 (three are shown in FIG. 1) drawn out to the rear end, and a rubber elastic member (rubber cap) 150 disposed on the rear end side of the separator 166 are provided. There. As will be described in detail later, a metal outer tube 144 is connected to the rear end side of the metal shell 138, the elastic member is inserted into the rear end side of the outer tube 144, and the elastic member 150 is The outer cylinder 144 is caulked to a reduced diameter.
The elastic member 150 is formed in a columnar shape, and five through holes 161 (one shown in FIG. 1) through which the lead wires are inserted in the axial direction O are formed along the circumferential direction of the elastic member 150. The elastic member 150 is made of, for example, silicon rubber or fluorine rubber. The through hole 161 may be formed by shifting from the circumferential direction of the elastic member 150.

  The connection terminal 30 is held in the separator 166 so as to face the contact insertion hole 166a. On the other hand, one or more electrode pads 10a and 10b are disposed on both surfaces of the rear end of the oxygen sensor element 10, and the protrusions 31p on the distal end side of the connection terminal 30 are in electrical contact with the individual electrode pads 10a and 10b. It has become. 1 shows a cross section perpendicular to the plate surface of the oxygen sensor element 10, and two electrode pads 10a are formed on one surface (left side in FIG. 1) of the rear end of the oxygen sensor element 10, and the other surface. Three electrode pads 10b are formed on the right side of FIG. A porous protective layer 20 is coated on the outer surface of the oxygen sensor element 10 on the front end side.

In this embodiment, the second separator 169 is disposed between the first separator 166 and the elastic member 150 along the axial direction O, and the rear end side of the connection terminal 30 is the insertion hole of the second separator 169. 169a, respectively. Therefore, the first separator 166 and the second separator 169 are collectively referred to as “separator” in the claims. However, the number of separators may be one.
Further, in this embodiment, the first separator 166 has a box shape that is divided into two along the axial direction O. After the connection terminals 30 are assembled into the two divided members, the members are assembled. Assembling is further performed by fitting a frame 167 around the outer periphery of each member. At this time, the L-shaped locking end 31 e at the leading edge of the connection terminal 30 is locked to the tip-facing surface of the first separator 166 to fix the connection terminal 30.

  The metal shell 138 has a substantially cylindrical shape having a through hole 154 that penetrates in the axial direction, and a shelf 152 that protrudes radially inward of the through hole 154. Further, the metal shell 138 holds the oxygen sensor element 10 in the through hole 154 in a state where the front end side is disposed outside the front end side of the through hole 154 and the electrode pads 10a and 10b are disposed outside the rear end side of the through hole 154. ing. Further, the shelf portion 152 is formed as an inwardly tapered surface having an inclination with respect to a plane perpendicular to the axial direction.

  In addition, inside the through hole 154 of the metal shell 138, an annular ceramic holder 151, a powder filling layer 156 (talc ring), and the above-described ceramic sleeve 106 are provided so as to surround the radial periphery of the oxygen sensor element 10. They are laminated in order from the front end side to the rear end side. Further, a caulking packing (not shown) is disposed between the ceramic sleeve 106 and the rear end of the metal shell 138, and between the ceramic holder 151 and the shelf 152 of the metal shell 138, A metal holder (not shown) for holding the talc ring 156 and the ceramic holder 151 and maintaining hermeticity is disposed. Note that the rear end portion of the metal shell 138 is crimped so as to press the ceramic sleeve 106 toward the distal end side via a crimping packing. The ceramic sleeve 106 may also be replaced with a talc filling layer, similar to the powder filling layer 156.

  On the other hand, as shown in FIG. 1, a metal (for example, stainless steel) having a plurality of holes and covering the protruding portion of the oxygen sensor element 10 on the outer periphery of the front end side (downward in FIG. 1) of the metal shell 138. A double external protector 142 and an internal protector 143 are attached by welding or the like.

  A metal protective cylinder (outer cylinder) 144 is fixed to the outer periphery on the rear end side of the metal shell 138 by welding or the like. Further, an elastic member 150 is disposed at the opening on the rear end side (upper side in FIG. 1) of the outer cylinder 144, and after passing each lead wire 146 through each through-hole 161 of the elastic member 150, The sealing cylinder portion 144a at the end portion is caulked from the outer peripheral surface in a reduced diameter (clamped with Happo-maru), thereby compressing the sealing cylinder portion 144a in the radial direction and holding the seal in the through hole 161 and the like. .

  The first separator 166 is disposed inside the outer cylinder 144, and the outer cylinder 144 is caulked from the outer peripheral surface in a reduced diameter (Happo-maru caulking) so that the first separator 166 is positioned at a predetermined position in the outer cylinder 144. Is held in. The second separator 169 has a cylindrical shape, and a cylindrical spring material 170 is disposed in the outer cylinder 144 between the first separator 166 and the second separator 169. Then, the second separator 169 is urged toward the rear end side by the spring material 170 and comes into contact with the surface facing the front end of the elastic member 150, so that the second separator 169 is held at a predetermined position in the outer cylinder 144.

Although the oxygen sensor element 10 has a known structure, in brief, the oxygen sensor element 10 includes a first pumping cell and an oxygen concentration detection cell, each cell comprising an oxygen ion permeable solid electrolyte body and a pair of electrodes. ing. The oxygen sensor element 10 includes a heater. When the gas to be measured is introduced into the measurement chamber in the oxygen sensor element 10, the oxygen concentration detection cell detects the oxygen concentration in the measurement chamber, but the oxygen concentration detection cell has a constant reference voltage (theoretical air-fuel ratio). In order to detect, the first pumping cell pumps or pumps excess oxygen in the gas to be measured to the outside, and detects the Ip current at that time to detect the oxygen concentration.
The electrode pads 10a and 10b are used to input / output the Ip2 current (voltage conversion value thereof), the detection value of the oxygen concentration detection cell, and the pumping current of the first pumping cell to / from an external controller.

FIG. 2 is a perspective view showing an arrangement state of the elastic member 150, the connection terminal 30, the first separator 166, and the metal shell 138 in the outer cylinder 144. The front end sides of the five connection terminals 30 are arranged close to each other in a relatively small first separator 166 (more specifically, as shown in FIG. 6, they are arranged laterally along both surfaces of the gas sensor element 10. In contrast, it can be seen that the rear end side of the connection terminal 30 extends toward the through hole 161 (that is, the lead wire 146) of the elastic member 150.
Note that the outer cylinder 144 and the second separator 169 are omitted in FIG. 2 for easy understanding of the arrangement of the connection terminals 30.
The connection terminal 30 is disposed along the gas sensor element around the electrode pad (front end side), and is disposed along the circumferential direction at the connection portion (rear end side) with the lead wire 146. And the through-hole 161 (refer FIG. 1) formed in the elastic member 150 is also arrange | positioned along the circumferential direction. At this time, the positions of the specific electrode pad and the through hole corresponding to the specific electrode pad are shifted when viewed in the axial direction.

Next, with reference to FIG. 3 and FIG. 4, the structure of the connection terminal 30 which is the characteristic part of this invention is demonstrated. The connection terminal 30 includes a plate-like element connection portion 31 located on the front end side, a plate-like lead wire connection portion 33 located on the rear end side, a main surface 31 s of the element connection portion 31, and the lead wire connection portion 33. A coupling portion 35 that connects the main surface 33s is provided. The coupling portion 35 couples the side surfaces of the main surfaces 31s and 33s so that the main surfaces 31s and 33s intersect each other (in this example, a right angle) (see FIG. 4).
The element connecting portion 31 and the lead wire connecting portion 33 are “plate-like” means that a portion including the tip end side to the rear end side is plate-like, and is twisted (twisted in the middle of the front and back). Does not include).

The element connecting portion 31 has its side surface connected to the coupling portion 35 and bends in the thickness direction of the plate surface from the main surface 31 s toward the front end side (the axial direction O). A first bent portion 31c (shifted in a vertical direction), a tip portion 31d extending in the axial direction O from the first bent portion 31c toward the tip side, and a protrusion 31p protruding from one surface of the tip portion 31d And a locking end 31e that is bent in an L-shape from the tip edge of the tip 31d to the side opposite to the protrusion 31p. As already described, the protrusion 31p is in electrical contact with the individual electrode pads 10a and 10b.
The lead wire connecting portion 33 has its side surface connected to the coupling portion 35 and bends in the thickness direction of the plate surface from the main surface 33 s to the rear end side (axis direction O). A second bent portion 33c, a rear end portion 33d extending in the axial direction O from the second bent portion 33c toward the rear end side, and a crimp terminal on the rear end side of the rear end portion 33d. Part 33e. The crimp terminal portion 33e has a known cylindrical shape, and the lead wire is electrically connected to the lead wire connecting portion 33 by inserting and crimping the lead wire with the conductive wire exposed in the cylinder. The

4 is a cross-sectional view of the connection terminal 30 in the vicinity of the coupling portion 35 taken along the line AA in FIG. Since the entire plate surface of the element connecting portion 31 is oriented in the same direction as the main surface 31s when viewed in the axial direction O, the whole can be bent (deformed) in a direction L perpendicular to the main surface 31s. On the other hand, as viewed in the axial direction O, the entire plate surface of the lead wire connecting portion 33 faces in the same direction as the main surface 33 s, and as a whole may be bent (deforms) in a direction T perpendicular to the main surface 33 s. it can.
That is, the lead wire connecting portion 33 on the rear end side of the connecting portion 30 and the element connecting portion 31 on the front end side of the connecting portion 35 bend (deform) in two directions L and T intersecting with each other. Therefore, the connection terminal 30 can bend (deform) in all directions perpendicular to the axial direction O as a whole.

Accordingly, when viewed from a cross section perpendicular to the axial direction, the through-holes 161 of the elastic member 150 are arranged along the circumferential direction as shown in FIG. 5, while the both surfaces on the rear end side of the gas sensor element 10 as shown in FIG. 6. When the electrode pads 10a and 10b are arranged on each other, the connection terminal 30 can bend (deform) in any direction perpendicular to the axial direction O. Therefore, the electrode pads are arranged side by side along the plate surface of the gas sensor element 10. 10a and 10b and the lead wire 146 aligned on the circumference along the through hole 161, the connection terminal 30 is deformed, and the electrode pads 10a and 10b and the lead wire 146 as shown in FIG. Thus, the connection terminal 30 can be reliably connected.
That is, while the element connection portion 31 on the front end side of the connection terminal 30 is arranged in the lateral direction along both surfaces of the gas sensor element 10, the connection terminal 30 is deformed and the lead wire connection portion 33 on the rear end side is changed. The elastic member 150 can expand corresponding to the through hole 161 (that is, the lead wire 146).

In the present embodiment, since the first bent portion 31c is provided in the element connecting portion 31, the tip end portion 31d of the element connecting portion 31 can be shifted in the direction L from the main surface 31s. Therefore, compared to the case where the first bent portion 31c is not provided, the position of the front end portion 31d can be shifted (offset) from the rear end portion 31s without forcibly bending the entire element connection portion 31, and the electrode pads 10a, 10b And the lead 146 can better cope with the positional deviation.
Similarly, when the second bent portion 33c is provided in the lead wire connecting portion 33, the rear end portion 33d of the lead wire connecting portion 33 can be shifted in the direction T from the main surface 33s. Therefore, compared to the case where the second bent portion 33c is not provided, the position of the rear end portion 33d can be shifted (offset) from the front end portion 33s without forcibly bending the entire lead wire connecting portion 33, and the electrode pads 10a, 10b and the lead wire 146 can better cope with the positional deviation.

  In the present invention, if the connection terminals have the same shape, the parts can be shared, which is preferable in terms of cost reduction. In the conventional gas sensor, the shapes of the plurality of connection terminals are different from each other in order to cope with the positional deviation between the electrode pads 10a and 10b and the lead wire 146. However, in the present invention, the connection terminals are perpendicular to the axial direction O. Since it can bend (deform) in any direction, the amount of deformation and the degree of freedom of deformation are large, and even if the shape of the connection terminal is the same, it corresponds to the displacement of the positions of the electrode pads 10a, 10b and the lead wire 146. be able to.

It goes without saying that the present invention is not limited to the above-described embodiment, but extends to various modifications and equivalents included in the spirit and scope of the present invention.
For example, in the above embodiment, the connection terminal is formed by integrally punching a single metal plate (Inconel (registered trademark) or the like) and integrally forming the rear end portion of the element connection portion and the front end portion of the lead wire connection portion. The boundary between the connecting part and the lead wire connecting part is bent, and this bent part is used as a connecting part. The element connecting part and the lead wire connecting part are formed separately, and both are connected by welding or the like. It is good. In this case, different materials suitable for the required characteristics can be used for the element connecting portion and the lead wire connecting portion.
The shape of the connection terminal is not limited to the above, and the first bent portion and the second bent portion may not be provided. Further, the shape of the separator is not limited.
Further, the gas sensor element is plate-shaped, and it is sufficient that one or more electrode pads are disposed on both sides of the rear end side of the gas sensor element. In addition to the oxygen sensor element (entire region air-fuel ratio sensor element), the λ sensor can be used element, NO _x sensor element, the ammonia sensor element.

In the above embodiment, the element connection portion of the connection terminal is disposed “along the plate surface” of the gas sensor element (the electrode pad), and the lead wire connection portion of the connection terminal is “circumferentially (through hole of the elastic member). However, the present invention is not limited to this, and a plurality of connection terminals are provided, and the lead wire connection portion can follow the position of the through hole of the elastic member (corresponding to a positional shift). It is sufficient that the element connecting portions are arranged along the plate surface, and it is not essential that the lead wire connecting portions are arranged along the circumference.
However, especially when the element connection part of the connection terminal is arranged along the plate surface of the gas sensor element and the through holes of the elastic member are arranged along the circumference, the position of the element connection part and the lead wire connection part Since the deviation becomes large, the present invention can be effectively applied.

  Note that. As shown in the above embodiment (FIG. 2), when viewed in the axial direction, the connection terminal at the position of the through hole of the elastic member is larger than the distance between the connection terminals at the position of the electrode pad (corresponding to the distance between the element connection portions) When the distance between the connection terminals (corresponding to the distance between the lead wire connecting portions) is large (when the distance between the connection terminals spreads in the radial direction toward the rear end side), the displacement of the position of the connection terminals described above is large. Therefore, the present invention can be effectively applied.

10 Gas sensor element (NO _x sensor element)
10a, 10b Electrode pad 30 Connection terminal 31 Element connection portion 31s Element connection main surface 31c First bent portion 33 Lead wire connection portion 33s Lead wire connection main surface 33c Second bend portion 35 Joint portion 146 Lead wire 150 Elasticity Member 161 Through hole 166, 169 Separator 200 Gas sensor O Axial direction

Claims (4)

A gas sensor element having a plate shape extending in the axial direction and having one or more electrode pads disposed on both sides of the rear end side of the gas sensor element;
A plurality of connection terminals each of which is electrically connected to the tip side of the electrode pad;
A separator that holds the plurality of connection terminals inside each other in a separated state;
A plurality of lead wires electrically connected to the rear end side of the connection terminal and extending to the rear end side;
An elastic member disposed on a rear end side of the separator and formed with a plurality of through holes through which the lead wires are inserted in the axial direction, respectively,
The front end side of the connection terminal forms a plate-like element connection portion connected to the electrode pad, and the rear end side of the connection terminal forms a plate-like lead wire connection portion connected to the lead wire, as the orientation of the principal surface and the principal surface of the lead wire connecting portions of the element connection portion intersect, a gas sensor, each of the main faces are connected via a connecting portion.   2. The gas sensor according to claim 1, wherein a first bent portion that shifts from the rear end portion in a direction perpendicular to the axial direction is provided in the element connection portion on the front end side from the rear end portion of the element connection portion. .   The lead wire connecting portion on the rear end side of the leading end portion of the lead wire connecting portion is provided with a second bent portion that shifts from the leading end portion in a direction perpendicular to the axial direction. The gas sensor described.   The gas sensor according to claim 1, wherein all of the connection terminals have the same shape.

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