JP4069802B2 - Gas sensor - Google Patents

Description

[0001]
【Technical field】
The present invention relates to a gas sensor used for combustion control of an internal combustion engine for automobiles.
[0002]
[Prior art]
The gas sensor includes a housing through which the sensor element is inserted through an element side insulator, a gas side cover to be measured provided on the distal end side of the housing, and an atmosphere side cover provided on the base end side of the housing. Are known.
[0003]
In the gas sensor according to this configuration, the atmosphere-side insulator is located closer to the base end side than the element-side insulator and inside the atmosphere-side cover so as to surround the outside of the base-end side end portion of the sensor element. Is provided.
That is, a plurality of terminals and terminal springs are electrically connected on the proximal end side of the sensor element. It is necessary to provide an atmosphere side insulator to ensure the insulation.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 2-146365
[0005]
[Problems to be solved]
However, when the atmosphere-side insulator is provided in a floating state inside the atmosphere-side cover of the gas sensor, the sensor element is cantilevered, and when the gas sensor is subjected to vibration or impact, the atmosphere-side insulator is shaken and the sensor element May break down.
Therefore, there has been a need for a gas sensor having a configuration in which the atmosphere-side insulator does not enter a floating state.
[0006]
The present invention has been made in view of such conventional problems. The atmospheric insulator is fixed at a predetermined position with respect to the atmospheric cover, and the atmospheric insulator is hardly displaced. An object of the present invention is to provide a gas sensor that is not easily broken.
[0007]
[Means for solving problems]
  According to a first aspect of the present invention, there is provided a housing through which a sensor element is inserted through an element side insulator, a measured gas side cover provided at a distal end side of the housing, and an atmosphere side cover provided at a proximal end side of the housing. A gas sensor comprising:
  An atmosphere side insulator is provided on the base end side of the element side insulator and inside the atmosphere side cover so as to surround the outside of the base end side end portion of the sensor element,
  A cylindrical fixing member is provided on the outer periphery of the atmosphere-side insulator,
  The cylindrical fixing member includes a main body that is fixed to the outer periphery of the atmosphere-side insulator, a fixing piece that faces the inner surface of the atmosphere-side cover from the main body, and fixes a tip end portion to the inner surface.R
And the inner surface of the atmosphere side cover has a protrusion, and the fixing piece is fixed to the protrusion.The gas sensor is characterized in that (claim 1).
[0008]
  According to a second aspect of the present invention, there is provided a housing through which the sensor element is inserted through an element side insulator, a measured gas side cover provided at the distal end side of the housing, and an atmosphere side cover provided at the proximal end side of the housing. A gas sensor comprising:
  An atmosphere-side insulation composed of a plurality of clamping members that are arranged on the base end side of the element-side insulator and inside the atmosphere-side cover so as to sandwich the base-end side end of the sensor element from the outside. A lion
  A pressing spring for pressing and fixing the holding member from the outer periphery;
  The pressing spring includes a main body that is fixed to the outer periphery of the atmosphere-side insulator, and a fixing piece that faces the inner surface of the atmosphere-side cover from the main body and fixes the tip to the inner surface.R
And the inner surface of the atmosphere side cover has a protrusion, and the fixing piece is fixed to the protrusion.The gas sensor is characterized in that (Claim 2).
[0009]
  According to a third aspect of the present invention, there is provided a housing through which the sensor element is inserted through an element side insulator, a measured gas side cover provided at the distal end side of the housing, and an atmosphere side cover provided at the proximal end side of the housing. A gas sensor comprising:
  An atmosphere side insulator is provided on the base end side of the element side insulator and inside the atmosphere side cover so as to surround the outside of the base end side end portion of the sensor element,
  A cylindrical fixing member is provided on the outer periphery of the atmosphere-side insulator,
  The cylindrical fixing member includes a main body that is fixed to the outer periphery of the atmosphere-side insulator, and a fixing piece that is fixed to the inner surface of the atmosphere-side cover from the main body toward the inner surface intersecting the radial direction of the gas sensor and fixing the tip to the inner surface. NaR
And the said inner surface of the said atmosphere side cover has a protrusion, and fixes the said fixing piece in this protrusionThe gas sensor is characterized in that (Claim 5).
[0010]
  According to a fourth aspect of the present invention, there is provided a housing through which the sensor element is inserted through an element side insulator, a measured gas side cover provided at the distal end side of the housing, and an atmosphere side cover provided at the proximal end side of the housing. A gas sensor comprising:
  An atmosphere-side insulation composed of a plurality of clamping members that are arranged on the base end side of the element-side insulator and inside the atmosphere-side cover so as to sandwich the base-end side end of the sensor element from the outside. A lion
  A pressing spring for pressing and fixing the holding member from the outer periphery;
  The pressing spring includes a main body fixed to the outer periphery of the atmosphere-side insulator, and a fixing piece for fixing the front end portion to the inner side surface from the main body toward the inner surface intersecting with the radial direction of the gas sensor on the inner surface of the atmosphere-side cover.R
And the said inner surface of the said atmosphere side cover has a protrusion, and fixes the said fixing piece in this protrusionThe gas sensor is characterized in that (Claim 6).
[0011]
In the gas sensor according to the present invention, the atmosphere-side insulator is fixed to the inner surface and the inner surface of the atmosphere-side cover using a cylindrical fixing member and a pressing spring provided on the outer periphery of the atmosphere-side insulator. For this reason, it is difficult for a large positional shift with respect to the atmosphere side insulator inside the atmosphere side cover to occur, and breakage of the sensor element can be prevented.
[0012]
As described above, according to the present invention, it is possible to provide a gas sensor that fixes an atmosphere-side insulator to a predetermined position with respect to an atmosphere-side cover, does not easily cause a displacement of the atmosphere-side insulator, and does not easily break a sensor element. Can do.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In the gas sensor according to the first and second inventions, the inner surface has an inner ceiling surface intersecting the gas sensor axial direction, and at least one of the fixing pieces of the cylindrical fixing member is fixed to the inner ceiling surface. (Claim 3). Alternatively, the inner surface has an inner surface intersecting with the gas sensor radial direction and an inner ceiling surface intersecting with the gas sensor axial direction, and at least one of the fixing pieces of the cylindrical fixing member is disposed on the inner ceiling surface. It is preferable that at least one of these is fixed to the inner surface (claim 4).
[0014]
In any of the above-described configurations, the atmosphere-side insulator can be fixed in the gas sensor axial direction by fixing the fixing piece of the cylindrical fixing member to the internal ceiling surface intersecting with the gas sensor axial direction.
Further, the configuration according to claim 4 can fix the atmosphere side insulator in the gas sensor radial direction as well as in the gas sensor axial direction. In this case, a plurality of fixing pieces can be provided, and one can be fixed to the inner ceiling surface and another fixing piece to the inner side surface. A configuration in which one fixed piece is fixed to both the inner ceiling surface and the inner side surface is also possible.
When it is configured to be fixed in both the gas sensor axial direction and the gas sensor radial direction, it is possible to firmly fix the cylinder side fixing member so as not to be displaced in the axial direction or the radial direction.
Note that the internal ceiling surface is the inner surface of the atmosphere-side cover that intersects the gas sensor axial direction and faces the element-side insulator, and is formed at a portion where the diameter of the atmosphere-side cover is switched, for example, as shown in FIG. Is done.
[0015]
Further, the cylindrical fixing member in the present invention is a cylindrical member provided on the outer periphery of the atmosphere side insulator, and is provided mainly to play a role of fixing the atmosphere side insulator to the atmosphere side cover.
The pressing spring is a member having a spring action that goes inward from the outside in the radial direction of the gas sensor. By applying a pressing force inward from the outside to the plurality of holding members, the plurality of holding members are integrally configured to form the atmosphere. It functions as a side insulator (see Example 1 described later).
[0016]
In the gas sensor according to any one of the first to fourth inventions, the sensor element is a stacked sensor element having a rectangular cross section in the gas sensor radial direction, and the cylindrical fixing member and the pressing spring are arranged in a cross section of the sensor element. It is preferable to have a fixing piece formed in a direction orthogonal to each of the two long sides.
[0017]
Alternatively, the sensor element is a stacked sensor element having a rectangular cross section in the gas sensor radial direction, and the cylindrical fixing member and the pressing spring are in directions orthogonal to two short sides of the cross section of the sensor element. It is preferable to have a formed fixing piece (claim 8).
[0018]
In a sensor element having a rectangular cross section, a long side and a long side, and a short side and a short side are opposite side surfaces. Therefore, according to the seventh and eighth aspects of the invention, since the fixing piece and the inner side surface of the atmosphere side cover are fixed in a direction passing through the opposite side surfaces of the sensor element, the atmosphere side insulator is opposed to the sensor element. In particular, it is difficult for positional deviation to occur in the direction penetrating the side surface, and it is possible to prevent the air side insulator from shaking when an impact or vibration is applied from the outside, thereby preventing breakage of the sensor element.
[0019]
Alternatively, the sensor element is a stacked sensor element having a rectangular cross section in the gas sensor radial direction, and the cylindrical fixing member and the pressing spring are formed in directions orthogonal to four sides of the cross section of the sensor element. It is preferable to have a fixed piece (claim 9).
Since the cylindrical fixing member and the pressing spring are fixed inside the atmosphere-side cover at the four locations, the displacement of the atmosphere-side insulator in the radial direction is further less likely to occur, and breakage of the sensor element can be prevented.
[0020]
Further, it is preferable that the distal end side end surfaces of the cylindrical fixing member and the pressing spring abut on the proximal end side of the element side insulator.
As a result, the atmosphere-side insulator is less likely to be displaced with respect to the element-side insulator, so that breakage of the sensor element due to the displacement of the atmosphere-side insulator can be more effectively prevented. In addition, when it abuts on the base end side, there are a case where it abuts directly on the element side insulator and a case where it abuts via another member (see FIG. 21).
[0021]
  Also,As explained in claims 1, 2, 5 and 6,The inner surface of the atmosphere side coverOrThe inner surface has a protrusion, and the fixing piece is fixed at the protrusion.The
  By fixing the fixing piece at the protrusion and fixing the cylindrical fixing member and the pressing spring at a predetermined position in the atmosphere-side cover with respect to the atmosphere-side cover, the displacement of the atmosphere-side insulator is further less likely to occur. Element breakage can be prevented.
[0022]
  Preferably, the fixed piece and the atmosphere side cover are fixed by welding.11).
  By welding, the cylindrical fixing member and the pressing spring can be securely and firmly fixed to the atmosphere-side cover, and the displacement of the atmosphere-side insulator is further less likely to occur, and breakage of the sensor element can be prevented. .
[0023]
  Also, bend the tip of the fixed piece to~ sideIt is preferable to form a tip portion to be fixed in contact with the inner surface or inner surface of the cover.12(See FIG. 20).
  As a result, the contact area between the inner surface and inner surface and the fixed piece at the tip is reduced.TheA wide contact can be made, the frictional force increases, and the fixing piece can be fixed to the inner surface and the inner surface more firmly.
[0024]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
Example 1
As shown in FIG. 1, the gas sensor 1 of this example includes a housing 10 through which the sensor element 29 is inserted through the element side insulator 2, a measured gas side cover 109 provided at the front end side of the housing 10, and the housing 10 and an atmosphere-side cover 11 provided on the base end side.
[0025]
Two clamping members 61 configured to sandwich the proximal end of the sensor element 29 from the outside on the proximal side of the element side insulator 2 and inside the atmosphere-side cover 11; An atmosphere side insulator 3 composed of 62 is provided, and pressing springs 31 and 32 for pressing and fixing the clamping members 61 and 62 from the outer periphery are provided.
[0026]
As shown in FIG. 4, the pressing spring 32 has a main body 320 fixed to the outer periphery of the atmosphere side insulator 3 and an inner surface of the atmosphere side cover 11 from the main body 320 toward the inner side surface 110 intersecting with the gas sensor radial direction. And a fixing piece 321 for fixing the 322 to the inner side surface 110.
[0027]
This will be described in detail below.
The gas sensor 1 according to this example is installed in an exhaust pipe of an automobile engine, and measures the oxygen concentration and NOx concentration in the exhaust gas and the air-fuel ratio of the engine combustion chamber.
The sensor element 29 incorporated in the gas sensor 1 is a laminated element formed by laminating ceramic plates. The sensor element 29 measures and monitors the oxygen concentration in the measured gas chamber provided inside the element, and the oxygen in the measured gas chamber. An oxygen pump cell for adjusting the concentration, a sensor cell for measuring the NOx concentration in the gas chamber to be measured, and a heater that generates heat when energized are integrally provided (not shown).
Voltage application to the heater, voltage application to each cell, and output extraction are performed at terminals 291 and 292 provided on the side surface of the sensor element 29.
[0028]
Therefore, the gas sensor 1 according to this example requires a total of eight lead wires 41 to supply power to the three cells and the heater and take out the output, and the lead wire 41 and the terminals 291 and 292. Eight connecting members 42 and terminal springs 51 and 52 are also required.
[0029]
As shown in FIGS. 2 and 5, there are four terminal electrodes 291 and 292 on one side of the sensor element 29, and four terminal electrodes 291 and 292 on the opposite side. Accordingly, four terminal springs 51 and 52 are arranged so as to sandwich the sensor element 29 from one side surface and the opposite side surface.
Since FIG. 1 is a cross-sectional view cut along the axial direction of the gas sensor 1, the description of the lead wire in an invisible position is omitted.
[0030]
As shown in FIG. 1, the gas sensor 1 of this example includes a metal housing 10, a double-structured metal gas side cover 109 attached to the distal end side of the housing 10, and a metal attached to the proximal end side. It consists of the atmosphere side cover 11 made from. The atmosphere-side cover 11 includes a first cover 111 that is caulked and fixed to the housing 10, and an outer cover 112 that is caulked and fixed to the base end side of the first cover 111 via a water repellent filter 113.
[0031]
The ceramic element-side insulator 2 is inserted into the housing 10, and the side surface of the element-side insulator 2 has a tapered surface 102 facing the front end side of the gas sensor. Further, the inner surface of the housing 10 faces the base end side of the gas sensor, and has a receiving surface 101 for supporting the tapered surface 102 via the metal packing 200.
[0032]
A disc spring 21 is placed on the end side end face of the element side insulator 2, and the pressing member 22 is crowned from above the disc spring 21. The pressing member 22 includes a pressing plate 221 that presses the disc spring 21 and contracts in the gas sensor axial direction, and a leg portion 222 that extends from the pressing plate 221 along the proximal end side surface of the housing 10 toward the distal end side. The element side insulator 2 is fixed to the housing 10 by fixing between the end side surface and the leg portion 222.
[0033]
In the state where the conduction contact portions 502 of the terminal springs 51 and 52 are in contact with the terminals 291 and 292 (see FIG. 5) and the conduction contact portion 502 is bent toward the support portion 50 (see FIG. 7), The terminal springs 51 and 52 and the sensor element 29 are clamped and fixed using the clamping members 61 and 62.
[0034]
Two pressing springs 31 and 32 configured to apply a pressing force toward the radially inner side of the gas sensor 1 to the clamping members 61 and 62 are provided on the outer periphery of the clamping members 61 and 62.
The sandwiching members 61 and 62 are made of an insulating ceramic, and the sandwiching members 61 and 62 form the atmosphere-side insulator 3 that ensures insulation between the terminal springs 51 and 52.
[0035]
The pressing springs 31 and 32 will be described.
As shown in FIG. 3, the pressing spring 31 includes a main body 310 and an elastic spring portion 319.
The main body 310 is a lightly curved rectangular plate shape along the outer peripheral surfaces of the sandwiching members 61 and 62, and a rectangular window 319 is provided in the center for weight reduction and flexibility.
In addition, there are spring portions 319 extending from the four corners of the main body 310 in a direction substantially perpendicular to the main body 310. The cross-sectional shape of the pressing spring 31 in the portion where the spring portion 319 is provided is a U-shape as shown in FIG. Further, the tip of the spring portion 319 is bent into a dogleg shape.
[0036]
And the shape of the spring part 319 before assembling | attaching with respect to the clamping members 61 and 62 was shown by the continuous line of Fig.3 (a). By assembling to the clamping members 61 and 62, the spring part 319 has a shape according to the broken line in FIG. The state in which the pressing spring 31 is assembled to the clamping members 61 and 62 is clear from FIG. Thus, the spring force generated by the deformation of the spring portion 319 of the pressing spring 31 can press the clamping members 61 and 62 in the radial direction of the gas sensor 1.
[0037]
As shown in FIG. 4, the pressing spring 32 includes a main body 320 and a spring portion 329. The pressing spring 32 extends from the main body 320 toward the inner surface of the atmosphere-side cover 11, and the distal end portion 322 has an atmosphere. A fixing piece 321 fixed to the inner surface 110 of the side cover 11 is provided.
As shown in FIG. 4A, the pressing spring 32 is formed by a U-shaped member formed by bending a long member along the outer peripheral surface of the holding members 61 and 62. The spring portion 329 is formed in a direction substantially orthogonal to the main body portion 320, and the tip of the spring portion 329 is bent into a dogleg shape.
[0038]
And the shape of the spring part 329 before assembling | attaching with respect to the clamping members 61 and 62 was shown by the continuous line of Fig.4 (a). By assembling to the clamping members 61 and 62, the spring part 329 becomes a shape concerning the broken line of Fig.4 (a). The state where the pressing spring 32 is assembled to the clamping members 61 and 62 is clear from FIG. Thus, the spring force generated by the deformation of the spring portion 329 of the pressing spring 32 can press the clamping members 61 and 62 in the radial direction of the gas sensor 1.
[0039]
The terminal springs 51 and 52 will be described.
As shown in FIGS. 5 to 7, the terminal springs 51, 52 are provided on the support portion 50 and the support portion 50, and the holding member 61 (the terminal springs 51, 52 between the holding member 62 and the sensor element 29 may be used). For example, the fixing projection 500 protrudes toward the clamping member 62) and the conductive contact portion 502 is formed by bending at the bent portion 501.
[0040]
As shown in FIGS. 5 and 6B, the support portion 50 of the terminal spring 52 has a straight shape extending in parallel with the sensor element 29, and the end of the support portion 50 is the bent portion 501. Further, a portion that is folded back from the bent portion 501 along the sensor element 29 toward the base end side becomes a conductive contact portion 502.
[0041]
Further, as shown in FIGS. 5 and 6A, the support portion 50 of the terminal spring 51 is composed of an A portion parallel to the sensor element 29 and a B portion formed perpendicular to the A portion in order from the base end side. , B ends are the bent portions 501. A portion that is folded back from the bent portion 501 along the sensor element 29 toward the base end side becomes a conductive contact portion 502. In addition, the angle θ of bending between the support part 50 and the conductive contact part 502 is an acute angle.
[0042]
6A and 6B, the conductive contact portion 502 has a second bent portion 505, and the first contact portion 503 and the second bent portion are between the bent portion 501 and the second bent portion 505. A second contact portion 504 is between 505 and the end of the conductive contact portion 502. Further, the bending angle φ in the second bent portion 505 is an obtuse angle.
[0043]
The terminal springs 51 and 52 are in contact with the terminals 291 and 292 of the sensor element 29 as shown in FIGS. The terminal spring 51 is in contact with the terminal 291, and the terminal spring 52 is in contact with the terminal 292.
And when both contact, the conduction | electrical_connection contact part 502 of the terminal spring 52 bends and deform | transforms in a gas sensor radial direction like the broken line 509 shown in FIG. The same applies to the terminal spring 51.
Further, the gas sensor 1 according to this example includes a total of eight terminal springs 51 and 52, and the distances between the eight terminal springs 51 and 52 and the terminals 291 and 292 in the gas sensor element 29 are not uniform. The bending as shown in FIG. 7 absorbs the difference in distance between the terminal springs 51 and 52 and the terminals 291 and 292.
[0044]
Next, the clamping members 61 and 62 will be described.
The sandwiching members 61 and 62 are made of an insulating ceramic, and by combining them, the atmosphere-side insulator 3 having an octagonal cross section having a through hole in the axial direction is obtained. The cross-section of the clamping members 61 and 62 is a shape obtained by dividing an octagon into two in the radial direction. FIG. 2 shows the clamping members 61 and 62 as viewed from the base end side of the gas sensor 1.
[0045]
A surface of the clamping member 61 that faces the terminal springs 51 and 52 is shown in FIG. 9 (a) shows the terminal spring 61, and FIG. 9 (b) shows a cross-sectional view taken along line (aa) in FIG. 8 at a position where the storage groove portions 601 and 602 for storing the terminal spring 62 are provided. bb) It is arrow sectional drawing.
The surface of the clamping member 61 that faces the terminal springs 51 and 52 has storage groove portions 601 and 602 for storing the terminal springs 51 and 52. Each of the storage groove portions 601 and 602 has substantially the same shape as the support portion 50 of the terminal springs 51 and 52.
[0046]
When the terminal springs 51 and 52 are clamped together with the sensor element 29 by the clamping members 61 and 62, the terminal springs 51 and 52 are stored in the storage groove portions 601 and 602 and are not easily displaced in the radial direction.
Since the holding members 61 and 62 have the same shape, only the holding member 61 is shown in the drawing.
[0047]
In order to fix the clamping members 61 and 62 and the terminal springs 51 and 52, a fixing projection 500 that protrudes toward the clamping members 61 and 62 is provided on the support portion 50 of the terminal springs 51 and 52. As is apparent from FIG. 6, the fixing protrusion 500 is formed by bending the support portion 50 in the longitudinal direction.
As shown in FIGS. 8 and 9, the storage groove portions 601 and 602 have a fixing recess 600 into which the fixing protrusion 500 is fitted.
[0048]
FIG. 10 is a plan view of the outer surface of the clamping member 61. The outer side surface has depressions 605 and 606 for pressing springs for storing the pressing springs 31 and 32 for preventing the positional displacement of the pressing springs 31 and 32 when the pressing springs 31 and 32 are provided.
Reference numeral 605 denotes a pressing spring 31, and reference numeral 606 denotes a pressing spring recess for storing the pressing spring 32.
[0049]
As shown in FIG. 11A, the terminal spring 51 can be provided with a conductive protrusion 505 produced by punching as shown in FIG. 11B on the first contact portion 503 of the conductive contact portion 502. .
Further, the surfaces of the clamping members 61 and 62 facing the terminal springs 51 and 52 can be configured as shown in FIG. In the clamping members 61 and 62 according to this figure, the terminal springs 51 and 52 are housed in the same housing groove 607.
[0050]
In the gas sensor 1 according to the present example, the atmosphere-side insulator 3 is extended from the pressing spring 32 and the main body 320 provided on the outer periphery thereof toward the inner side surface 110 of the atmosphere-side cover 11, and the distal end portion 322 is located on the inner side surface 110. It has a fixed piece 321 to be fixed.
Due to the fixing piece 321, it is difficult for a large positional shift to occur in the atmosphere-side insulator 3 inside the atmosphere-side cover 11.
[0051]
As described above, according to the present example, a gas sensor is provided in which the atmospheric side insulator is fixed at a predetermined position with respect to the atmospheric side cover, so that the displacement of the atmospheric side insulator is less likely to occur and the sensor element is not easily broken. can do.
[0052]
(Example 2)
The gas sensor of this example incorporates a laminated sensor element having a rectangular cross section in the gas sensor radial direction, and a cylindrical fixing member 7 as shown in FIGS. 13 to 18 is provided on the outer periphery of the atmosphere-side insulator. The cylindrical fixing member 7 includes a cylindrical main body 70 that is fixed to the outer periphery of the atmosphere-side insulator, and a fixing piece 71 that extends from the main body 70 toward the inner side surface 110 of the atmosphere-side cover and fixes the tip 710 to the inner side surface 110. Become.
[0053]
Each cylindrical fixing member will be described.
As shown in FIG. 14, the cylindrical fixing member 7 is a cylindrical shape having a square cross section, and one of the side surfaces is an opening 701. A rectangular window portion 700 is provided on a side surface 702 orthogonal to the side surface having the opening 701, and a fixed piece 71 is provided on an edge 703 of the window portion 700. The fixing piece 71 was formed by cutting a side surface 702 and bending the edge 703.
Then, as shown in FIG. 13, the cylindrical fixing member 7 is connected to the atmosphere side insulator (illustrated) so that the fixing piece 71 is positioned in the direction orthogonal to the two long sides a with respect to the sensor element 29 having a rectangular cross section. (Omitted).
[0054]
The cylindrical fixing member 71 shown in FIGS. 15 and 16 has the same shape as that shown in FIGS. 13 and 14, but is perpendicular to the two short sides b with respect to the sensor element 29 having a rectangular cross section. The difference is that the cylindrical fixing member 7 is fitted into the outer periphery of the atmosphere side insulator (not shown) so that the fixing piece 71 is positioned in the direction.
[0055]
Moreover, the cylindrical fixing member 75 shown in FIGS. 17 and 18 has fixing pieces 71 and 76 on all four side surfaces. Similar to the cylindrical fixing member 7 shown in FIGS. 13 to 16, the side surface 706 includes the opening 73, but the width is narrower than the opening 701, and the side surface 706 also has the fixing piece 76 as in the other side surfaces 702. Have. However, a slit by the opening 73 enters the center of the fixed piece 76 and the window 760.
[0056]
Then, as shown in FIG. 17, the cylindrical fixing member 7 is connected to the atmosphere-side insulator (illustrated) so that the fixing pieces 71 and 76 are positioned in directions orthogonal to the four sides with respect to the sensor element 29 having a rectangular cross section. (Omitted).
In addition, the detailed configuration of the gas sensor is the same as that of the first embodiment in which the fixing piece 321 of the pressing spring is eliminated, and has the same function and effect.
[0057]
(Example 3)
This example demonstrates the fixed state of the fixing piece with respect to the inner surface of the atmosphere side cover. As shown in FIG. 19, the inner side surface 110 of the atmosphere-side cover 11 is punched inward to provide a protrusion 115, and the protrusion 115 and the tip of the fixed piece 321 are abutted and fixed.
Further, as shown in FIG. 20, the tip of the fixing piece 321 is bent to form a tip 322, and this tip 322 is brought into contact with the inner side surface 110 to be fixed.
19 and 20 describe the fixing piece 321 of the pressing spring 32, but the same configuration can be applied to the fixing piece of the cylindrical fixing member as in the second embodiment.
As a result, the inner surface 110 and the fixed piece 321 can come into contact with each other at the tip end portion 322 with a wide contact area, and the frictional force is increased so that the fixed piece 321 and the inner side surface 110 can be fixed more firmly.
Other details have the same configuration and operational effects as in the first embodiment.
[0058]
Example 4
In this example, as shown in FIG. 21, the gas sensor 1 is configured such that the fixing piece 321 of the pressing spring 32 abuts the inner ceiling surface 112 and the distal end side surface 325 of the pressing spring 32 abuts on the proximal end side of the element side insulator 2. explain.
The first cover 111 of the atmosphere-side cover 11 has a large diameter at the distal end side and a small diameter at the proximal end side, and has an inner surface 110 that intersects the gas sensor radial direction and an internal ceiling surface 112 that intersects the gas sensor axial direction.
The inner ceiling surface 112 is formed at a portion where the diameter of the first cover 111 is switched, and the fixing pieces 321 are both fixed to the inner ceiling surface 112.
Further, the distal end side end surface 325 of the pressing spring 32 abuts against a holding plate 221 of the disc spring 21 provided on the proximal end side of the element side insulator.
[0059]
In the gas sensor 1 of this example, the atmosphere-side insulator 3 is fixed to the axial direction of the gas sensor 1 by a pressing spring 32, and the air-side insulator 3 inside the atmosphere-side cover is large as in the first embodiment. Misalignment is unlikely to occur, and breakage of the sensor element can be prevented.
Other detailed configurations are the same as those in the first embodiment.
[0060]
(Example 5)
In this example, as shown in FIG. 22, the fixing piece 321 of the pressing spring 32 is on the inner ceiling surface 112, the fixing piece 323 is on the inner surface 110, and the distal end side end surface 325 of the pressing spring 32 is the base end of the element side insulator 2. The gas sensor 1 configured to abut on the side will be described.
The first cover 111 of the atmosphere-side cover 11 has a large diameter at the distal end side and a small diameter at the proximal end side, and has an inner surface 110 that intersects the gas sensor radial direction and an internal ceiling surface 112 that intersects the gas sensor axial direction.
The inner ceiling surface 112 is formed at a portion where the diameter of the first cover 111 is switched, and the fixing pieces 321 are both fixed to the inner ceiling surface 112.
Further, the distal end side end surface 325 of the pressing spring 32 abuts against a holding plate 221 of the disc spring 21 provided on the proximal end side of the element side insulator.
[0061]
In the gas sensor 1 of this example, the atmosphere-side insulator 3 is fixed to the axial direction of the gas sensor 1 by a pressing spring 32, and the air-side insulator 3 inside the atmosphere-side cover is large as in the first embodiment. Misalignment is unlikely to occur, and breakage of the sensor element can be prevented.
Other detailed configurations are the same as those in the first embodiment.
[0062]
(Example 6)
In a gas sensor incorporating a laminated sensor element having a rectangular cross section in the radial direction of the gas sensor, a cylindrical fixing member 7 provided on the outer periphery of the atmosphere-side insulator will be described with reference to FIGS.
The cylindrical fixing member 7 of FIG. 23 includes a cylindrical main body 70 that is fixed to the outer periphery of the atmosphere-side insulator, and a fixing piece 72 that extends further upward from the upper end of the main body 70 and is fixed to the inner ceiling surface. Become.
[0063]
The cylindrical fixing member 7 of FIG. 24 includes a cylindrical main body 70 that is fixed to the outer periphery of the atmosphere-side insulator, a fixing piece 72 that extends further upward from the upper end of the main body 70, and is fixed to the inner ceiling surface. The main body 70 is directed to the inner side surface 110 of the atmosphere side cover, and includes a fixing piece 71 that fixes the tip 710 to the inner side surface 110.
The cylindrical fixing member 75 in FIG. 25 has a cylindrical main body 702 that is fixed to the outer periphery of the atmosphere-side insulator and a fixing piece 72 that extends further upward from the upper end of the main body 702 and is fixed to the inner ceiling surface. . The side surface 706 of the main body 702 has a narrow opening 73, and the fixed piece 72 is provided on the side surface 706 and the surface facing the side surface 706. There is a slit formed by the opening 73 at the center of the fixed piece provided on the side surface 706 having the opening 73.
[0064]
The cylindrical fixing member 75 in FIG. 26 has a cylindrical main body 702 that is fixed to the outer periphery of the atmosphere-side insulator and a fixing piece 72 that extends further upward from the upper end of the main body 702 and is fixed to the inner ceiling surface. . The side surface 706 of the main body 702 has a narrow opening 73, and the fixing piece 72 is provided on all four side surfaces 702. There is a slit formed by the opening 73 at the center of the fixed piece provided on the side surface 706 having the opening 73.
In addition, the detailed configuration of the gas sensor is the same as that of the first embodiment and the detailed configuration of the cylindrical fixing member is the same as that of the second embodiment, and has the same effects.
[Brief description of the drawings]
FIG. 1 is an explanatory cross-sectional view in the axial direction of a gas sensor in Embodiment 1. FIG.
FIG. 2 is a plan view showing a state in which the inside of the atmosphere side cover of the gas sensor is looked down from the base end side of the gas sensor in the first embodiment.
3 is a cross-sectional explanatory view and a plan view of a pressing spring in Embodiment 1. FIG.
4 is a cross-sectional explanatory view and a plan view of another pressing spring in Embodiment 1. FIG.
FIG. 5 is a plan view of a terminal spring in the first embodiment.
FIG. 6 is a side view of a terminal spring in the first embodiment.
FIG. 7 is an explanatory view of the bending of the terminal spring in the first embodiment.
FIG. 8 is a plan view of the side of the clamping member facing the terminal spring in the first embodiment.
FIG. 9 is an explanatory cross-sectional view of a storage groove portion of a clamping member according to the first embodiment.
10 is a plan view of an outer side surface of a clamping member in Embodiment 1. FIG.
11 is an explanatory diagram of a terminal spring different from that of FIG. 6 in the first embodiment and having a conductive protrusion. FIG.
12 is a plan view of a clamping member different from that shown in FIG. 8 according to the first embodiment, on the side facing the terminal springs of the clamping member in which four terminal springs are stored in one storage groove.
FIG. 13 is an explanatory diagram of a state in which a fixed piece is positioned in a direction orthogonal to two long sides in the second embodiment.
14 is a perspective explanatory view of a cylindrical fixing member having the fixing piece according to FIG. 13 in Embodiment 2. FIG.
FIG. 15 is an explanatory diagram of a state in which a fixing piece is positioned in a direction orthogonal to two short sides in the second embodiment.
16 is a perspective explanatory view of a cylindrical fixing member having a fixing piece according to FIG. 15 in Example 2. FIG.
FIG. 17 is an explanatory diagram of a state where a fixed piece is positioned in a direction orthogonal to four sides in the second embodiment.
18 is a perspective explanatory view of a cylindrical fixing member having a fixing piece according to FIG. 17 in Example 2. FIG.
FIG. 19 is an explanatory diagram showing a fixed state between a fixed piece and an inner surface provided with a protrusion of an atmosphere side cover in the third embodiment.
FIG. 20 is an explanatory diagram showing a fixed state between a fixed piece having a bent tip and an inner surface of an atmosphere-side cover in Example 3.
FIG. 21 is an explanatory diagram of a main part of a gas sensor having a pressing spring having a fixing piece fixed to an internal ceiling surface in Example 4.
FIG. 22 is an explanatory view of a main part of a gas sensor having a pressing spring having fixing pieces respectively fixed to an inner side surface and an inner ceiling surface in Example 5.
23 is a perspective explanatory view of a cylindrical fixing member having a fixing piece fixed to an internal ceiling surface in Embodiment 6. FIG.
24 is a perspective explanatory view of a cylindrical fixing member having fixing pieces respectively fixed to an inner ceiling surface and an inner side surface in Embodiment 6. FIG.
FIG. 25 is a perspective explanatory view of a cylindrical fixing member having a fixing piece fixed to an internal ceiling surface in Example 6.
FIG. 26 is a perspective explanatory view of a cylindrical fixing member having four fixing pieces fixed to the inner ceiling surface in the sixth embodiment.
[Explanation of symbols]
1. . . Gas sensor,
11. . . Atmosphere side cover,
110. . . Inner surface,
10. . . housing,
2. . . Element side insulator,
29. . . Sensor element,
291,292. . . Terminal,
3. . . Atmospheric insulator,
31, 32. . . Pressing spring,
321,71. . . Fixed piece,
41. . . Lead,
51,52. . . Terminal spring,
61, 62. . . Clamping members,
7, 75. . . Cylindrical fixing member,
70. . . Body,

Claims (12)

A gas sensor comprising a housing through which a sensor element is inserted through an element side insulator, a gas side cover to be measured provided at the front end side of the housing, and an atmosphere side cover provided at the base end side of the housing,
An atmosphere side insulator is provided on the base end side of the element side insulator and inside the atmosphere side cover so as to surround the outside of the base end side end portion of the sensor element,
A cylindrical fixing member is provided on the outer periphery of the atmosphere-side insulator,
Tubular fixation member is directed to the inner surface of the atmosphere-side cover from the body and the body to be fixed to the air side insulator periphery, Ri the tip name more and fixing tabs for fixing to the inner surface,
The inner surface of the atmosphere side cover has a protrusion, and the fixing piece is fixed at the protrusion . A gas sensor comprising a housing through which a sensor element is inserted through an element side insulator, a gas side cover to be measured provided at the front end side of the housing, and an atmosphere side cover provided at the base end side of the housing,
An atmosphere-side insulation composed of a plurality of clamping members that are arranged on the base end side of the element-side insulator and inside the atmosphere-side cover so as to sandwich the base-end side end of the sensor element from the outside. A lion
A pressing spring for pressing and fixing the holding member from the outer periphery;
Pressing pressure spring, toward the inner surface of the atmosphere-side cover from the body and the body to be fixed to the air side insulator periphery, Ri the tip name more and fixing tabs for fixing to the inner surface,
The inner surface of the atmosphere side cover has a protrusion, and the fixing piece is fixed at the protrusion . The inner surface according to claim 1 or 2, wherein the inner surface has an inner ceiling surface intersecting with the gas sensor axial direction,
At least one of the fixing pieces is fixed to an internal ceiling surface. In Claim 1 or 2, the inner surface has an inner surface that intersects with the gas sensor radial direction and an inner ceiling surface that intersects with the gas sensor axial direction,
At least one of the fixed pieces is fixed to an inner ceiling surface, and at least one of the fixed pieces is fixed to an inner surface. A gas sensor comprising a housing through which a sensor element is inserted through an element side insulator, a gas side cover to be measured provided at the front end side of the housing, and an atmosphere side cover provided at the base end side of the housing,
An atmosphere side insulator is provided on the base end side of the element side insulator and inside the atmosphere side cover so as to surround the outside of the base end side end portion of the sensor element,
A cylindrical fixing member is provided on the outer periphery of the atmosphere-side insulator,
The cylindrical fixing member includes a main body that is fixed to the outer periphery of the atmosphere-side insulator, and a fixing piece that is fixed to the inner surface of the atmosphere-side cover from the main body toward the inner surface intersecting the radial direction of the gas sensor and fixing the tip to the inner surface. Do Ri,
And the said inner surface of the said atmosphere side cover has a protrusion, The said fixing piece is fixed in this protrusion, The gas sensor characterized by the above-mentioned . A gas sensor comprising a housing through which a sensor element is inserted through an element side insulator, a gas side cover to be measured provided at the front end side of the housing, and an atmosphere side cover provided at the base end side of the housing,
An atmosphere-side insulation composed of a plurality of clamping members that are arranged on the base end side of the element-side insulator and inside the atmosphere-side cover so as to sandwich the base-end side end of the sensor element from the outside. A lion
A pressing spring for pressing and fixing the holding member from the outer periphery;
Pressing pressure spring, the inner surface of the atmosphere-side cover from the body and the body to be fixed to the air side insulator periphery toward the inner surface intersecting the gas sensor radially, Ri the tip name more and fixing tabs for fixing to the inner surface ,
And the said inner surface of the said atmosphere side cover has a protrusion, The said fixing piece is fixed in this protrusion, The gas sensor characterized by the above-mentioned . The sensor element according to any one of claims 1 to 6, wherein the sensor element is a stacked sensor element having a rectangular cross section in the gas sensor radial direction,
The gas sensor according to claim 1, wherein the cylindrical fixing member and the pressing spring have fixing pieces formed in directions orthogonal to two long sides in a cross section of the sensor element. The sensor element according to any one of claims 1 to 6, wherein the sensor element is a stacked sensor element having a rectangular cross section in the gas sensor radial direction,
The gas sensor according to claim 1, wherein each of the cylindrical fixing member and the pressing spring includes a fixing piece formed in a direction orthogonal to two short sides in a cross section of the sensor element. The sensor element according to any one of claims 1 to 6, wherein the sensor element is a stacked sensor element having a rectangular cross section in the gas sensor radial direction,
The gas sensor according to claim 1, wherein the cylindrical fixing member and the pressing spring have fixing pieces formed in directions orthogonal to four sides of the cross section of the sensor element.   The gas sensor according to any one of claims 1 to 9, wherein the end surfaces on the distal end side of the cylindrical fixing member and the pressing spring abut on the proximal end side of the element side insulator. The gas sensor according to claim 1, wherein the fixing piece and the atmosphere-side cover are fixed by welding. The tip of the fixing piece according to any one of claims 1 to 11, wherein the tip of the fixing piece is bent and brought into contact with an inner surface or an inner surface of the atmosphere-side cover to form a fixing tip. Gas sensor.

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