JP2000193633A - Oxygen sensor with heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oxygen sensor in which the position of a ceramic heater in the inner space of a detection element is hardly shifted. SOLUTION: A recess part 17a, engageable with a heater gripper 9a, is formed on the circumferential face of a ceramic heater 17 for heating and activating a detection element of an oxygen sensor. When the ceramic heater 17 is gripped by the heater gripper 9a, the heater gripper 9a is engaged with the recess part 17a, to thereby make the gripped position hard to slip. As a result, the possibility of moving of the position or the posture of the ceramic heater 17 in the inner space of the detection element can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxygen sensor with a heater, which is used for measuring the concentration of oxygen in exhaust gas and has a ceramic heater for heating in an inner space of a bottomed cylindrical detecting element.

[0002]

2. Description of the Related Art Conventionally, there has been known an oxygen sensor for detecting an oxygen concentration in exhaust gas of an internal combustion engine or the like by using an oxygen ion-concentrating cell using an oxygen ion conductive solid electrolyte such as zirconia. . This type of oxygen sensor is formed on the inner surface side and the outer surface side of the detection element body formed by the solid electrolyte body or the like into a bottomed cylindrical body having one end closed and the other end opened. And a detection element including an inner electrode and an outer electrode. An electromotive force is generated between the inner electrode and the outer electrode in accordance with the oxygen concentration difference between the inner space and the outer space of the detection element formed in the cylindrical body. It becomes possible to detect the oxygen concentration in the exhaust gas of an engine or the like.

[0003] Conventionally, there has been known a technique of disposing a rod-shaped ceramic heater in an internal space of a detection element in order to heat and activate the detection element. The ceramic heater is, for example, held by a holding member formed integrally with a terminal member that is fitted through an opening of the detection element and is electrically connected to the inner electrode, and is disposed in the internal space of the detection element.

[0004]

However, since such a gripping member grips the outer periphery of the rod-shaped ceramic heater by the elastic force of the gripping member itself, the gripping position is shifted due to, for example, external vibration. Therefore, the position and posture of the ceramic heater in the internal space of the detection element may fluctuate. If the position or posture of the ceramic heater changes, the heat generated by the ceramic heater may be difficult to be transmitted to the detection element, and eventually, the warm-up performance of the detection element may be reduced, and the oxygen There is also a possibility that the detection characteristics are degraded.

The present invention has been made in view of the above problems, and has as its object to provide a heater-equipped oxygen sensor in which the position of a ceramic heater in an internal space of a detection element is not easily shifted.

[0006]

Means for Solving the Problems and Effects of the Invention The present invention (claim 1) to solve the above-mentioned problems has the following features.
A detection element in which an oxygen ion conductive solid electrolyte body is formed in a closed-end cylindrical shape having one end closed and the other end opened, and a porous electrode formed on the inner and outer surfaces of the solid electrolyte body; And a ceramic heater provided with a heat generation pattern that generates heat when energized in the ceramic sintered body, wherein the ceramic heater is gripped by a heater gripping member formed to be able to grip the outer periphery of the ceramic heater. In the oxygen sensor with a heater fixed in the internal space of the detection element, a locking portion capable of locking the heater gripping member is provided at a position on the outer peripheral surface of the ceramic heater gripped by the heater gripping member. It is characterized by.

In the oxygen sensor with heater according to the present invention having the above-described structure (claim 1), the ceramic heater for generating heat in the heat generation pattern to heat the detecting element is formed in a rod shape. The outer peripheral surface is gripped by the heater gripping member and fixed in the internal space of the detection element.
An engaging portion formed to be capable of engaging the heater holding member is provided at a position where the heater holding member is held on the outer peripheral surface of the ceramic heater.

Therefore, according to the oxygen sensor with a heater of the present invention (claim 1), since the outer peripheral surface of the ceramic heater is provided with the locking portion capable of locking the heater gripping member, the heater gripping member is provided. When the ceramic heater is gripped, by locking the heater gripping member to the locking portion,
The holding position can be made hard to shift. As a result, the possibility that the position of the ceramic heater in the internal space of the detection element fluctuates can be reduced, and consequently, the warm-up performance of the detection element decreases, and the oxygen detection characteristics of the oxygen sensor may deteriorate. Can also be reduced.

In order to prevent the gripping position of the heater gripping member from being displaced by providing the locking portion on the outer peripheral surface of the ceramic heater, specifically, the heater gripping member is provided on the shaft of the ceramic heater. It is conceivable to limit the movement along the direction.
The effects of the invention described in (1) can be obtained. Claim 3
As described in the above, the movement of the heater gripping member along the outer peripheral direction of the ceramic heater may be restricted, and in such a case, the effect of the invention described in claim 1 can be obtained. It should be noted that the inventions of claims 2 and 3 may be combined, so that the position fluctuation of the ceramic heater in the internal space of the detection element can be more effectively suppressed, and the warm-up of the detection element can be further extended. This is preferable because performance can be maintained.

[0010] The specific shape of the locking portion is described in claim 4.
It may be configured as a concave portion provided on the outer peripheral surface of the ceramic heater, as described in (5), or as a groove portion provided along the outer peripheral direction on the outer peripheral surface of the ceramic heater, as described in (5). You may. A part of the heater holding member may be fitted into the concave portion or the groove provided on the outer peripheral surface of the ceramic heater to lock the heater holding member, or the entire heater holding member may be fitted and locked. You may make it do. Further, as described in claim 6,
The locking portion may be configured as a step portion provided on the outer peripheral surface of the ceramic heater so that the thickness of the ceramic heater changes in the axial direction.

By the way, conventionally, the energization of the ceramic heater has been performed through a heater energization terminal brazed to the electrode portion of the heating pattern. However, it is troublesome to braze the terminal for energizing the heater to the electrode part of the heat generation pattern, and the heat from the exhaust gas, which is becoming increasingly hot, reduces the brazing strength, resulting in poor electrical connection. There was a possibility.

Therefore, as described in claim 7, at the end of the ceramic heater, a second step having a thickness different from that of the ceramic heater in the axial direction is provided, and a heat generating pattern is provided near the second step. An electrode section is provided. Then, it is preferable that a current-carrying terminal for supplying power to the heat-generating pattern via the electrode part of the heat-generating pattern is locked to the second step so as to contact the electrode part of the heat-generating pattern.

According to the oxygen sensor with a heater according to the seventh aspect of the present invention, since the energizing terminal is locked to the second step portion so as to contact the electrode portion of the heat generating pattern, The terminal for use can be prevented from deviating from the electrode portion of the heat generation pattern, and the electrical connection with the electrode portion can be ensured. In addition, since electrical connection can be easily achieved without using brazing, there is an effect that the number of manufacturing steps can be reduced and the manufacturing cost can be reduced. The invention according to claim 7 may be applied to the oxygen sensor with a heater according to any one of claims 2 to 6.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the overall configuration of an oxygen sensor with a heater (hereinafter, simply referred to as “oxygen sensor”) according to a first embodiment. In the oxygen sensor according to the present embodiment, as shown in FIG. 1, a detection element S for detecting oxygen concentration has a cylindrical shape with one end closed and the other end opened, and has an oxygen ion conductivity mainly composed of zirconia. Element body 3 formed of a solid electrolyte body. An inner electrode 5 and an outer electrode 7, which are heat-resistant porous electrodes made of platinum, are provided on the inner surface side and the outer surface side of the detection element body 3, respectively.
Is formed, and a flange 3a is formed in the center of the outside of the detection element body 3. On the inner side and the outer side of the opening of the detection element S, lead wires 13 and 14 (covered and protected) for extracting signals from the inner electrode 5 and the outer electrode 7 are provided on the inner output terminal 9 and the inner output terminal 9, respectively. It is connected via the outer output terminal 10.

The inner output terminal 9 is electrically connected to the inner electrode 5 by fitting the detecting element S into the opening. At its lower end (closed end side of the detection element body 3), a heater grip 9a for holding a ceramic heater 17 for heating and activating the detection element S is provided. The heater holding portion 9a is formed by bending a plate-like body into a substantially cylindrical shape, and its inner diameter is slightly smaller than the outer diameter of the ceramic heater 17;
7 can be held by elastic force.

The detecting element S includes a ceramic cylindrical holding member 21, 23, talc powder 25, and a packing 27.
And so on, are arranged in the metal shell 29 made of heat-resistant metal so as to extend vertically through the metal shell 29 so as to extend in the vertical direction in the figure. And in the lower part of the metal shell 29,
A protective cap 31 having a hole 31a for introducing a gas to be measured is attached so as to cover the tip of the detection element S (the side where one end of the cylinder is closed). An inner cylinder 33 made of a heat-resistant metal (stainless steel in this embodiment) is attached by crimping via an O-ring 35 so as to cover the periphery of the upper part of the element S and the ceramic heater 17. An outer cylinder 39 made of a heat-resistant metal (made of stainless steel in this embodiment) is fitted to the outside.

A space 41 between the upper part of the inner cylinder 33 and the outer cylinder 39 (that is, a space above the detecting element S) is formed in a substantially circular shape having a through hole 43 through which the lead wires 13 to 16 penetrate. Columnar ceramic separator 45 and grommet rubber 4
7 are arranged in order from the detection element S side.
It prevents water from entering inside.

The oxygen sensor thus configured is attached to an exhaust pipe of an internal combustion engine or the like via a metal shell 29, and the tip of the detection element S protected by the protective cap 31 is placed inside the exhaust pipe. It protrudes and is exposed to the exhaust gas to be measured. On the other hand, the lead 1
Atmosphere is introduced through gaps between 3 to 16 twisted core wires. As a result, the inner electrode 5 and the outer electrode 7 of the detection element S
A voltage corresponding to the ratio of the oxygen concentration in the atmosphere to the oxygen concentration in the gas to be measured is generated between the two, and the voltage is output to the outside as a detection signal.

In the oxygen sensor of this embodiment, the ceramic heater 17 disposed inside the detecting element S is formed in a rod shape and has a heater pattern 50 (see FIG. 2) inside. A lead terminal 18 to which heater lead wires 15 and 16 are respectively connected is soldered to 50. That is, the ceramic heater is configured to be capable of generating heat in the heater pattern 50 by energization through the lead wires 15 and 16.

As shown in FIG. 2, the heater pattern 50 used for producing the ceramic heater 17 includes a heat generating pattern portion 52 which generates heat by energization, and a pair of conductive pattern portions 54a extending at both ends of the heat generating pattern portion 52. 54b, and electrode pattern portions 56a and 56b formed at the other ends of the conductive pattern portions 54a and 54b.

In order to form the ceramic heater 17, first, the heater pattern 50 is sandwiched between green sheets mainly composed of alumina, that is, a first green sheet 62 and a second green sheet 64 to form a laminate. To form In addition, on the surface of the first green sheet 62,
Electrode pattern for soldering lead terminals (brazing part) 6
6a and 66b are formed in advance, and through holes (not shown) are formed in the corresponding electrode pattern portions 56a and 56b, respectively.
Is electrically connected via the. Ceramic heater 17
Is manufactured by winding the laminated body formed as described above around a rod-shaped base material (porcelain tube) 68 mainly composed of alumina with the first green sheet 62 as a front side, followed by firing.

The ceramic heater 1 manufactured as described above
7, the brazing portion 66 formed on the surface
At a and 66b, a lead terminal 18 for connecting a lead wire is soldered. Then, the ceramic heater 17 holds the detection element S by holding the inner output terminal 9 by the heater holding portion 9a.
Is fixed in the internal space, and heat is generated in the heat generating pattern portion 52 by energization through the lead terminal 18 to heat and activate the detecting element S.

In the direction along the axis of the ceramic heater 17,
A notch 62 is provided at the edge of the first green sheet 62.
a, 62b are formed. Notches 64a and 64b are formed at the same position of the second green sheet 64 corresponding to the notches 62a and 62b. Therefore, a concave portion 17a is formed on the surface of the ceramic heater 17 configured by winding the laminate of the two green sheets 62 and 64 around the base material 68.

The concave portion 17a is provided at a position where the ceramic gripper 9a grips the ceramic heater 17, and the outer peripheral edge 9b of the heater grip portion 9a is engaged with the concave portion 17a. . In addition, as shown in FIG. 3, it is preferable to bend the outer peripheral edge 9b of the heater grip 9a inward (that is, toward the ceramic heater 17) because the edge 9b is securely locked by the concave portion 17a. .

According to the oxygen sensor of the first embodiment configured as described above, since the outer peripheral surface of the ceramic heater 17 is provided with the concave portion 17a engageable with the heater grip portion 9a, the heater grip portion 9a When the ceramic heater 17 is gripped, the gripping position can be hardly shifted by engaging the heater gripping portion 9a with the concave portion 17a.
That is, the gripped ceramic heater 17 is hardly shifted in the axial direction and hardly shifted in the outer circumferential direction. As a result, it is possible to reduce the possibility that the position and the posture of the ceramic heater 17 in the internal space of the detection element fluctuate. The possibility of deterioration can be reduced.

The heater grip 9a has an inwardly directed edge 9b and is securely engaged with the recess 17a, so that the ceramic heater 17 can be gripped more reliably. Next, an oxygen sensor as a second embodiment will be described.

FIG. 4 is an explanatory view showing the structure of the ceramic heater 117 used in the oxygen sensor of the second embodiment. In the oxygen sensor according to the second embodiment, the laminate wound around the base material 68 includes the first green sheet 162 and the second green sheet 162.
In addition to the green sheet 164, it is further composed of two green sheets (a third green sheet 170 and a fourth green sheet 172).

First, the heater pattern 50 is sandwiched between the first green sheet 162 and the second green sheet 164, and the third green sheet is placed on the surface of the first green sheet 162 opposite to the second green sheet 164. 1
70 and the fourth green sheet 172 are brought into close contact with each other. The third green sheet 170 and the fourth green sheet 172 are pressed against the first green sheet 162 at predetermined intervals in the axial direction of the base material 68.

Brazing portions 174a and 174b for brazing lead terminals are formed on the surface of the third green sheet 170 in advance. Brazing parts 174a, 174b
Correspond to the through holes (not shown) provided in the third green sheet 170 and the through holes 162a, 16a provided in the first green sheet 162.
2b, the corresponding electrode pattern portions 56a, 56
6b.

The laminate thus formed is wound around the base material 68 with the third green sheet 170 and the fourth green sheet 172 facing up and fired.
As shown in (a), a rod-shaped ceramic heater 117 having a groove 117a formed in the outer peripheral direction is obtained. Groove 11
7a is provided at a holding position of the inner output terminal 109 by the heater holding portion 109a, and when the heater holding portion 109a holds the ceramic heater 17, the heater holding portion 109a is provided.
Is fitted into the groove 117a (FIG. 5B), and the gripped ceramic heater 117 is prevented from shifting in the axial direction. The brazing portion 1 on the surface of the ceramic heater 117
74a and 174b have lead terminals 1 for connecting lead wires.
8 is brazed.

Since the configuration of the oxygen sensor of the second embodiment other than the above is the same as that of the first embodiment, the description is omitted. According to the oxygen sensor of the second embodiment configured as described above, since the outer peripheral surface of the ceramic heater 117 is provided with the groove 117a engageable with the heater grip 109a, the ceramic heater 11 is provided in the heater grip 109a.
7 is held, the heater holding portion 109a is
By engaging with a, it is possible to prevent the gripping position from shifting in the axial direction. As a result, it is possible to reduce the possibility that the position and the posture of the ceramic heater 117 in the internal space of the detection element fluctuate.
It is possible to reduce the possibility that the warm-up performance for the detection element is reduced and the oxygen detection characteristics of the oxygen sensor are deteriorated.

Next, an oxygen sensor as a third embodiment will be described. FIG. 6 is an explanatory diagram showing the configuration of the ceramic heater 217 used in the oxygen sensor of the third embodiment. In the oxygen sensor according to the third embodiment, the laminate wound around the base material 68 includes the first green sheet 262 and the second green sheet 262.
It is composed of a green sheet 264, a third green sheet 270 and a fourth green sheet 272.

First, the heater pattern 250, that is, the first green sheet 262 and the second green sheet 26
4 between. As shown in FIG. 6, a heater pattern 250 used for producing the ceramic heater 217 includes a heat generating pattern portion 252 that generates heat by energization, and a pair of conductive pattern portions 25 extending at both ends of the heat generating pattern portion 252.
4a, 254b, and the respective conductive pattern portions 25
Electrode patterns 25 formed on the other ends of 4a and 254b
6a and 256b. This electrode pattern part 2
56a and 256b are provided at positions shifted in the axial direction of the base material 68. The first green sheet 262 is provided with an electrode section 266 for energizing the heater in advance, and is electrically connected to the electrode pattern section 256a via a through hole (not shown).

Furthermore, the second green sheet 262
On a surface opposite to the green sheet 264, a third green sheet 270 is sequentially provided from the first green sheet 262 side.
The fourth green sheet 272 is adhered. The third green sheet 170 is pressed against the first green sheet 262 so that the electrode portion 266 is exposed. The third green sheet 270 is provided with an electrode portion 274 for energizing the heater in advance, and the electrode pattern portion 256 b is provided through a through hole 268 provided in the first green sheet 262.
Is electrically connected to The fourth green sheet 272 is
The third green sheet 2 is exposed so that the electrode portion 274 is exposed.
The first green sheet 70 is pressed against the surface opposite to the first green sheet 262.

When the laminate thus formed is wound around the base material 68 with the fourth green sheet 272 facing the front side and fired, the laminate is formed in a rod shape as shown in FIG. The electrode portions 266 and 274 for energizing the heater are formed, and the electrode step portion 21 whose thickness changes in the axial direction is provided.
A ceramic heater 217 in which 7a and 217b are sequentially formed toward the center is obtained. Electrode parts 266, 27
4 and the electrode steps 217a and 217b are, specifically, from the end of the ceramic heater 217 toward the center, the electrode section 266, the electrode step 217a, and the electrode section 27.
4, the electrode steps 217b are arranged in this order.
These electrode steps 217a and 217b correspond to a second step in claim 7.

The lead terminals 218 for energizing the ceramic heater 217 are provided with electrode holding portions 218a and 218b capable of holding the outer peripheral portions where both electrode portions 266 and 274 are formed.
It has. These electrode grips 218a, 218b
Then, when the outer peripheral portions on which the electrode portions 266 and 274 are formed are respectively gripped, the electrode grip portions 218a and 218b are locked by the electrode step portions 217a and 217b, respectively (FIG. 7).
(B)). In addition, these electrode holding parts 218a, 218b
The lead terminal 218 provided with is equivalent to the energizing terminal of claim 7.

The fourth green sheet 272 has a through hole 27 having substantially the same size as the heater grip 9a of the inner output terminal 9.
2a is provided, and a concave portion 217c is formed on the outer peripheral surface of the ceramic heater 217. The ceramic heater 217 is gripped by the heater grip 9a and engages with the heater grip 9a at the concave portion 217c to form the detection element S.
Is fixed in the internal space of. The configuration of the oxygen sensor according to the third embodiment other than the above is the same as that of the first embodiment, and a description thereof will be omitted.

According to the oxygen sensor of the third embodiment constructed as described above, the recess 217c engageable with the heater grip 9a is formed on the outer peripheral surface of the ceramic heater 217. The same effect as the oxygen sensor of the example is exerted. Then, at the end of the rod-shaped ceramic heater 217, steps 217a and 217b whose thickness changes in the axial direction are provided.
Are formed in order toward the center, so that the electrode grip 21
When the end portions of the ceramic heater 217 are gripped by the electrodes 8a and 218b and brought into contact with the electrode portions 266 and 274, they are locked by the step portions 217a and 217b. As a result, the gripping position can be prevented from shifting in the axial direction, and the electrical connection between the electrode gripping portions 218a, 218b and the electrode portions 266, 274 can be ensured. Conventionally, electrical connection with the lead terminals for energizing the heater was attempted by brazing, which took a lot of time and effort in manufacturing.However, if the heater terminals formed so as to be grippable can be easily gripped, Electrical connection to the
There is an effect that the number of manufacturing steps can be reduced, and thus the manufacturing cost can be suppressed.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.
Various aspects can be taken. For example, in the above-described embodiment, the ceramic heater 17 is described as being manufactured by winding a laminate of the two green sheets 62 and 64 as a base material around a base material 68 formed into a cylindrical shape by an extrusion molding method. However, the ceramic heater 17 may be formed in a prism shape, for example, by being wound around a base material formed in a prism shape.

In the oxygen sensor according to the first embodiment, the entire outer peripheral edge 9b of the heater grip 9a is described as engaging with the recess 17a. However, the present invention is not limited to this. For example, as shown in FIG.
7a, the heater holding portion 3 of the inner output terminal 309 is provided.
09a may be provided with a claw portion 309b corresponding to the concave portion 317a, and this may be engaged. This recess 31
7a may be formed in the same manner as the concave portion 17a of the first embodiment. Further, a concave portion having a size that can fit the entire heater holding portion may be formed. These recesses also cause the first
The same effect as that of the oxygen sensor of the embodiment is obtained.

The recesses 17a and 17d are provided in the first
The green sheet 62 and the second green sheet 64 may be formed by providing through holes. Further, the second green sheet 64 is not provided with the cutout portions 64a and 64b and the through holes, but is provided with the cutout portions 62a and 62b and the through holes only in the first green sheet 62, and the concave portions 17a and 17d.
May be formed.

In the second embodiment, as shown in FIG. 4, a groove 117a is formed between the third green sheet 170 and the fourth green sheet 172 which are brought into close contact with the first green sheet 162. Although the description has been made assuming that only the third green sheet 170 is in close contact. That is, as shown in FIG.
Alternatively, a step 417a may be formed as an engaging portion on the outer peripheral surface of the ceramic heater 417. In this case, the heater holding portion 4 of the inner output terminal 409 is provided at the step portion 417a.
09a is locked, and the holding position is the ceramic heater 1
7 can be suppressed from shifting in the axial direction. As a result, it is possible to reduce the possibility that the position or the posture of the ceramic heater 117 in the internal space of the detection element fluctuates. Can be reduced. In FIG. 4, only the fourth green sheet 172 may be in close contact with the first green sheet 162 to provide a stepped portion.
Similar effects can be obtained. The step portion provided in this way corresponds to the step portion of claim 6.

Further, in the above embodiment, the heater holding member of claim 1 is connected to the inner output terminals 9, 109, 309, 409.
Grippers 9a, 109a, 30 formed integrally with
Although described as 9a and 409a, the invention is not limited to this, and it is clear that the heater holding member may be provided separately from the inside output output terminal.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of an oxygen sensor according to an embodiment.

FIG. 2 is an explanatory diagram illustrating a configuration and a manufacturing procedure of a ceramic heater in the oxygen sensor according to the first embodiment.

FIG. 3 is an explanatory diagram showing a relationship between a concave portion on an outer peripheral surface of a ceramic heater and a heater grip portion in the first embodiment.

FIG. 4 is an explanatory diagram illustrating a configuration and a manufacturing procedure of a ceramic heater in the oxygen sensor according to the second embodiment.

FIG. 5 is an explanatory view showing the relationship between a groove on the outer peripheral surface of a ceramic heater and a heater grip in the second embodiment.

FIG. 6 is an explanatory diagram illustrating a configuration and a manufacturing procedure of a ceramic heater in an oxygen sensor according to a third embodiment.

FIG. 7 is an explanatory diagram showing a relationship between an electrode step portion at an end portion of a ceramic heater and an electrode grip portion in a third embodiment.

FIG. 8 is an explanatory diagram showing another embodiment.

FIG. 9 is an explanatory diagram showing another embodiment.

[Explanation of symbols]

3 ... detector element body, 5 ... inner electrode, 7 ... outer electrode, 9,
109, 309, 409 ... inside output terminal, 9a, 109
a, 309a, 409a ... heater holding parts, 17, 11
7, 217, 317, 417: ceramic heater, 17
a, 217c, 317a recess, 218 ... lead terminal (current-carrying terminal), 50, 250 ... heater pattern, 68
... Substrate, 117a ... groove, 217a, 217b ... electrode step (second step), 218a, 218b ... electrode grip, 266,274 ... electrode, 417a ... step.

Continuation of the front page F term (reference) 2G004 BB01 BJ02 BM07 3K092 PP20 QA01 QB45 QB68 QB74 RB02 RD09 RD42 TT30 TT37 VV02 VV32

Claims (7)

[Claims] 1. A detection element in which an oxygen ion conductive solid electrolyte body is formed in a bottomed cylindrical shape having one end closed and the other end opened, and a porous electrode formed on the inner and outer surfaces of the solid electrolyte body. A ceramic heater formed of a rod-shaped ceramic sintered body and provided with a heat generation pattern that generates heat by energizing the ceramic sintered body; anda heater gripping member formed so as to be able to grip an outer periphery of the ceramic heater, An oxygen sensor with a heater, which grips a ceramic heater and is fixed in an inner space of the detection element, wherein the heater gripping member can be locked at a gripping position of the ceramic heater outer peripheral surface by the heater gripping member. An oxygen sensor provided with a heater. 2. The oxygen sensor with a heater according to claim 1, wherein the locking portion is provided on an outer peripheral surface of the ceramic heater so as to limit movement of the heater gripping member along an axial direction of the ceramic heater. An oxygen sensor with a heater. 3. The oxygen sensor with a heater according to claim 1, wherein the locking portion is provided on an outer peripheral surface of the ceramic heater so as to limit movement of the heater gripping member along an outer peripheral direction of the ceramic heater. An oxygen sensor with a heater. 4. The oxygen sensor with a heater according to claim 1, wherein the locking portion is a concave portion provided on an outer peripheral surface of the ceramic heater. 5. The oxygen sensor with a heater according to claim 1, wherein the locking portion is a groove provided on an outer peripheral surface of the ceramic heater along an outer peripheral direction thereof. . 6. The oxygen sensor with a heater according to claim 1, wherein the locking portion is a step portion provided on an outer peripheral surface of the ceramic heater so that a thickness of the ceramic heater changes in an axial direction. An oxygen sensor equipped with a heater. 7. The oxygen sensor with a heater according to claim 1, further comprising: a second step portion having a thickness of the ceramic heater different in the axial direction at an end of the ceramic heater, and a second step portion near the second step portion. Providing an electrode portion of the heating pattern, and providing a current-carrying terminal for supplying power to the heating pattern via the electrode portion of the heating pattern to the second step portion so as to contact the electrode portion of the heating pattern. An oxygen sensor with a heater which is locked.