JP2014126419A - Lead wire clip and sensor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that is able to hold a lead wire, extending from a sensor, by a simple configuration such that the lead wire is bent in a predetermined direction.SOLUTION: A lead wire clip has a lead wire projecting backward along the axial direction thereof, and is attached to an approximately cylindrical sensor provided with a groove in its own side face such that the groove extends in the circumferential direction thereof. This lead wire clip comprises: an arcuate arm part that can be fitted in the groove of the sensor; and a holding part that is able to hold the lead wire while the lead wire is bent in a direction intersecting the axial direction, the arm part and holding part being integrally formed.

Description

  The present invention relates to a lead wire clip and a sensor unit.

  As a gas sensor attached to an exhaust pipe of an engine provided in a vehicle, for example, a sensor including an oxygen ion conductive gas detection element is known. The gas sensor is provided with a lead wire for outputting a detection signal obtained by the gas detection element to the outside. This lead wire normally projects toward the rear side along the axial direction from the rear end of the main body of the gas sensor (see Patent Document 1).

JP 2000-314715 A

  However, there are cases where it is desired to restrict the direction in which the lead wire extends in a predetermined direction different from the axial direction of the gas sensor due to the layout of auxiliary equipment and piping in the vehicle body. For example, when a pipe exists on the rear side in the axial direction of the gas sensor, the lead wire interferes with the pipe, and therefore, it is necessary to bend the lead wire in a direction crossing the axial direction of the gas sensor. Therefore, the problem to be solved by the present invention is to provide a technique capable of holding a lead wire protruding toward the rear side of the sensor in a state bent in a predetermined direction with a simple configuration.

  The present invention has been made to solve the above-described problems, and can be realized as the following forms.

(1) According to one aspect of the present invention, there is provided a substantially cylindrical sensor having a lead wire protruding rearward along the axial direction and having a groove on its side surface extending in the circumferential direction. An attached lead clip is provided. The lead wire clip includes an arcuate arm portion that can be fitted into the groove of the sensor; a holding portion that can hold the lead wire in a state in which the lead wire is bent in a direction intersecting the axial direction; The arm portion and the holding portion are integrally formed. In the case of such a lead wire clip, the arm portion is fitted in the groove of the sensor and the lead wire extending from the rear end of the gas sensor is held by the holding portion, and the lead wire intersects with a predetermined direction (axial direction). Direction).

(2) In the lead wire clip, the sensor may be provided with a plurality of the grooves, and the arm portion can fit into two or more of the plurality of grooves, respectively. A plurality of them may be provided. In the case of the lead wire clip of such an aspect, since a plurality of arm portions are provided, the lead wire clip can be stably attached to the sensor.

(3) In the lead wire clip, each of the plurality of grooves is located on a bottom surface, a first side surface that is positioned on a front end side in the axial direction and rises from the bottom surface, and a rear end side in the axial direction. And a second side surface rising from the bottom surface. One arm portion of the plurality of arm portions can contact the first side surface and the second side surface in one groove of the plurality of grooves, and the plurality of arm portions The other arm portion may be in contact with the bottom surface in another groove of the plurality of grooves. In the case of the lead wire clip in such a form, one arm portion of the plurality of arm portions contacts the first side surface and the second side surface in one groove of the plurality of grooves. The movement of the lead wire clip in the axial direction can be suppressed. As a result, the lead wire clip can be stably attached to the sensor. On the other hand, the other arm portion of the plurality of arm portions can contact the bottom surface in the other groove of the plurality of grooves, so that the shape of the groove changes or the distance from the other groove changes. Even if it is a case, other arm parts can be made to contact other grooves favorably. As a result, even if a manufacturing error occurs in each groove, the lead wire can be stably fixed while absorbing the error.

(4) According to another aspect of the present invention, a substantially cylindrical sensor having a lead wire protruding rearward along the axial direction and having a groove on its side surface extending in the circumferential direction. And a lead wire clip attached to the sensor. Among these, the lead wire clip includes: an arc-shaped arm portion that fits in the groove of the sensor; and a holding portion that holds the lead wire in a state in which the lead wire is bent in a direction intersecting the axial direction. And the holding portion are integrally formed. In the case of such a sensor unit, the arm of the lead wire clip is fitted in the groove of the sensor, and the lead wire extending from the rear end of the gas sensor is held by the holding portion, and the lead wire is moved in a predetermined direction (axial direction). Can be bent in a direction that intersects with.

(5) In the sensor unit, the sensor may be provided with a plurality of the grooves, and the lead wire clip includes the arm portion in each of two or more of the plurality of grooves. A plurality may be provided so that they can be fitted. With such a gas sensor unit, since the lead wire clip has a plurality of arm portions, the lead wire clip can be stably attached to the sensor.

(6) In the sensor unit, each of the plurality of grooves is a bottom surface, a first side surface that is positioned on the tip end side in the axial direction and rises from the bottom surface, and a bottom surface that is positioned on the rear end side in the axial direction. And a second side surface that rises from the second side surface. One arm portion of the plurality of arm portions can contact the first side surface and the second side surface in one groove of the plurality of grooves, and the plurality of arm portions The other arm portion may be in contact with the bottom surface in another groove of the plurality of grooves. In the case of such a sensor unit, one arm portion of the plurality of arm portions contacts the first side surface and the second side surface in one groove of the plurality of grooves. The movement of the line clip in the axial direction can be suppressed. As a result, the lead wire clip can be stably attached to the sensor. On the other hand, the other arm portion of the plurality of arm portions can contact the bottom surface in the other groove of the plurality of grooves, so that the shape of the groove changes or the distance from the other groove changes. Even if it is a case, other arm parts can be made to contact other grooves favorably. As a result, even if a manufacturing error occurs in each groove, the lead wire can be stably fixed while absorbing the error.

  The present invention is not limited to the form of the lead wire clip or sensor unit described above, but can be implemented in various forms. For example, it can be realized in the form of a lead wire clip manufacturing method, a sensor unit manufacturing method, or the like.

It is a figure which shows schematic structure of the sensor unit as one Embodiment of this invention. It is sectional drawing of the gas sensor along an axis. It is explanatory drawing showing the external appearance of a sensor element. It is explanatory drawing which shows the structure of a lead wire clip. It is sectional drawing which shows the state in which the lead wire clip was attached to the gas sensor. It is a figure for demonstrating the 1st modification of a sensor unit. It is a figure for demonstrating the 2nd modification of a sensor unit. It is a figure for demonstrating the 3rd modification of a sensor unit.

A. Configuration of Sensor Unit FIG. 1 is a diagram showing a schematic configuration of a sensor unit as one embodiment of the present invention. The sensor unit 1 includes a gas sensor 100 and a lead wire clip 200. Hereinafter, in FIG. 1, the downward direction along the axis O of the gas sensor 100 will be described as the front end side, and the upward direction will be described as the rear end side. The gas sensor 100 is an oxygen sensor that measures the oxygen concentration in the exhaust gas of a vehicle such as a motorcycle. The gas sensor 100 is fixed to the vehicle in such a manner that its tip portion protrudes into the exhaust pipe of the vehicle. The lead wire clip 200 is a device that holds the lead wire 60 protruding rearward of the gas sensor 100 in a state bent in a direction intersecting the axis O.

B. Configuration of Gas Sensor FIG. 2 is a cross-sectional view of the gas sensor 100 along the axis O. FIG. The gas sensor 100 as a whole has a substantially cylindrical shape extending along the axis O. The gas sensor 100 includes a sensor element 10, a metal shell 20, a protector 62, an inner cylinder member 40, and an outer cylinder member 38.

  The sensor element 10 constitutes an oxygen concentration cell in which a pair of electrodes are stacked on both sides of a solid electrolyte body having oxide ion conductivity (oxygen ion conductivity). The sensor element 10 is a known oxygen sensor element that outputs a detection value corresponding to the oxygen partial pressure. The sensor element 10 includes a bottomed cylindrical solid electrolyte body 11 whose outer diameter is tapered toward the tip, an inner electrode (reference electrode) 10a formed on the inner surface of the solid electrolyte body 11, a solid An outer electrode (detection electrode) 10 d formed on the outer surface of the electrolyte body 11. The sensor element 10 detects the gas by making the internal space of the sensor element 10 a reference gas atmosphere and bringing the gas to be detected into contact with the outer surface of the sensor element 10. A lead wire 60 for taking out a detection signal from the inner electrode 10 a protrudes from the rear end of the gas sensor 100. A glass braided tube for protecting the lead wire 60 is provided on the outer periphery of the lead wire 60. This glass braided tube 61 can be omitted.

  FIG. 3 is an explanatory diagram showing the appearance of the sensor element 10. The sensor element 10 is formed with a flange 12 projecting (protruding) in the outer peripheral direction at the center in the direction of the axis O. A bottomed portion 13 that is gradually reduced in diameter toward the distal end side and closed at the distal end portion is formed on the distal end side of the flange portion 12. In the sensor element 10, a substantially hollow cylindrical base portion 18 having an opening at the rear end is formed on the rear end side of the flange portion 12.

  The outer electrode 10d includes an electrode part 10b formed so as to cover a part of the outer surface on the tip side of the bottomed part 13, and an external lead part 10c electrically connected to the electrode part 10b. The external lead portion 10 c includes a vertical lead portion 14 and a ring lead portion 15. The ring lead portion 15 is formed in an annular shape extending in the circumferential direction of the sensor element 10 on the tip-side surface of the flange portion 12 (stepped portion provided on the bottomed portion 13 side in the flange portion 12). The vertical lead portion 14 is formed to extend linearly in the direction of the axis O so as to connect the rear end of the electrode portion 10 b and the ring lead portion 15. The electrode portion 10b is covered with an electrode protection layer (not shown) for protecting the electrode portion 10b.

  As described above, the inner electrode 10 a is provided on the inner surface of the sensor element 10. A cylindrical hole 10e is formed inside the bottomed cylindrical solid electrolyte body 11 (see FIG. 2), and the inner electrode 10a is formed so as to cover the entire inner surface of the cylindrical hole 10e excluding the vicinity of the rear end. Has been.

The solid electrolyte body 11 can be composed of, for example, zirconium oxide (ZrO ₂ ) to which yttrium oxide (Y ₂ O ₃ ) is added, that is, yttria-stabilized zirconia. Alternatively, by other solid electrolyte such as stabilized zirconia to which an oxide selected from calcium oxide (CaO), magnesium oxide (MgO), cerium oxide (CeO ₂ ), aluminum oxide (Al ₂ O ₃ ) and the like is added. The sensor element 10 may be configured.

  The inner electrode 10a and the outer electrode 10d are preferably formed of a noble metal or a noble metal alloy such as platinum (Pt) or a platinum alloy. The inner electrode 10a and the outer electrode 10d can be formed by a plating method such as electroless plating, for example. When the solid electrolyte body 11 is manufactured by firing a molded body made of a solid electrolyte powder such as zirconia powder containing yttria, for example, the external lead portion 10c uses a noble metal paste on the outer surface of the molded body. By printing with a predetermined pattern, the molded body can be formed simultaneously with firing.

  Returning to FIG. 2, the gas sensor 100 includes a metal shell 20 made of metal (for example, stainless steel or carbon steel) that surrounds the sensor element 10 and exposes the tip of the sensor element. On the inner surface of the metal shell 20, a step portion 20b whose inner diameter is reduced toward the distal end is provided. Further, in the vicinity of the center of the metal shell 20, a polygonal flange portion 20c protruding outward in the radial direction is provided to engage the attachment tool. Furthermore, a male screw portion 20d is formed on the outer surface on the tip side of the flange portion 20c. The male screw 20d of the metal shell 20 is attached to, for example, a screw hole of an exhaust pipe of a motorcycle (motorcycle), and the tip of the sensor element 10 is disposed in the exhaust pipe. ) Can be detected. In the gas sensor 100, a gasket 29 that prevents gas from being released when the gas sensor 100 is attached to the exhaust pipe is further fitted into the step portion between the front end surface of the flange portion 20c and the rear end of the male screw portion 20d. It is.

  The gas sensor 100 includes a protector 62 that protrudes from the tip of the metal shell 20. The protector 62 is a bottomed cylindrical metal member formed by extending the bottom on the tip side in the axis O direction, and covers the tip of the sensor element 10 protruding from the metal shell 20. The protector 62 is formed with a plurality of holes 64 for taking the exhaust gas into the protector 62. The exhaust gas that has flowed into the protector 62 from the plurality of holes 64 is supplied to the outer electrode 10d as a gas to be detected. The rear end portion of the protector 62 is formed with a bent portion 63 that is bent outward in the radial direction so as to increase in diameter toward the rear end side.

  In the protector 62, the bent portion 63 and the packing 50 provided at the rear end portion of the protector 62 are sandwiched between the front surface side of the flange portion 12 of the sensor element 10 and the step portion 20 b of the metal shell 20. It is fixed by. The packing 50 is a thin plate-like metal member formed in an annular shape. When the sensor element 10 is assembled to the metal shell 20, first, the protector 62 is inserted into the metal shell 20 from the rear end side of the metal shell 20, and the bent portion 63 of the protector 62 is connected to the step portion 20 b of the metal shell 20. Abut. Thereafter, the packing 50 is further inserted into the metal shell 20 from the rear end side of the metal shell 20 and is brought into contact with the bent portion 63 of the protector 62. Then, the sensor element 10 is further inserted from the rear end side of the metal shell 20, and the surface on the front end side of the flange portion 12 is brought into contact with the packing 50.

  As described above, the ring lead portion 15 is provided on the front surface of the flange portion 12 of the sensor element 10. Therefore, the electrode portion 10 b is electrically connected to the metal shell 20 through the vertical lead portion 14, the ring lead portion 15, the protector 62, and the packing 50.

  A powder filling portion 31 in which talc powder is compressed and filled is disposed in a gap between the rear end portion of the sensor element 10 relative to the flange portion 12 and the metal shell 20. The gap between the sensor element 10 and the metal shell 20 is sealed by the powder filling portion 31. A cylindrical insulating member (ceramic sleeve) 32 is disposed on the rear end side of the powder filling unit 31.

  An inner cylindrical member 40 made of metal is fixed to the rear end portion of the metal shell 20. The inner cylinder member 40 covers a part of the rear end portion of the sensor element 10. The inner cylinder member 40 can be made of stainless steel or carbon steel such as SUS430, SUS304, SUS304L, SUS310S, SUS316, SUS316L, or the like. A metal ring 33 formed of, for example, stainless steel or carbon steel is disposed between the inner surface of the rear end portion of the metal shell 20 and the outer surface of the front end portion of the inner cylindrical member 40. The metal shell 20 and the inner cylinder member 40 are connected by crimping the front end portion of the inner cylinder member 40 with the rear end portion of the metal shell 20. By crimping the rear end portion of the metal shell 20 in this manner, the insulating member 32 is pressed toward the distal end side, the powder filling portion 31 is crushed, and the insulating member 32 and the powder filling portion 31 are crimped and fixed. At the same time, the gap between the sensor element 10 and the metal shell 20 is sealed.

  A substantially cylindrical and insulating separator 34 is disposed inside the inner cylindrical member 40. The separator 34 is formed with an insertion hole 35 that penetrates the separator 34 in the direction of the axis O and through which the lead wire 60 is inserted. A connection terminal 70 is connected to the leading end side of the lead wire 60. The connection terminal 70 is a member for taking out the sensor output to the outside, and is inserted into the sensor element 10 so as to be electrically connected to the inner electrode 10a.

  A substantially columnar grommet 36 is further disposed inside the inner cylindrical member 40 so as to contact the rear end of the separator 34. The grommet 36 has an insertion hole 42 that passes through the grommet 36 in the direction of the axis O and through which the lead wire 60 is inserted. The grommet 36 can be formed of a rubber material such as silicon rubber or fluorine rubber, for example.

  In the side surface of the inner cylindrical member 40, a plurality of first ventilation holes 41 are opened side by side in the circumferential direction at a position closer to the tip than the position where the grommet 36 is disposed. An annular breathable filter 37 is covered on the radially outer side of the rear end portion of the inner cylindrical member 40 so as to cover the first vent hole 41. Further, on the radially outer side of the inner cylindrical member 40 and the filter 37, a metallic cylindrical outer cylindrical member 38 is further arranged. The rear end of the outer cylindrical member 38 is bent inward, and the bent portion presses the grommet 36 from the rear end side. The outer cylinder member 38 can be formed of stainless steel or carbon steel such as SUS430, SUS304, SUS304L, SUS310S, SUS316, or SUS316L. A plurality of second vent holes 39 are opened side by side in the circumferential direction on the side surface of the outer cylindrical member 38. As a result, the inside of the inner cylinder member 40 and further to the inner electrode 10a of the sensor element 10 through the second ventilation hole 39 of the outer cylinder member 38, the filter 37, and the first ventilation hole 41 of the inner cylinder member 40. And outside air can be introduced.

  The outer cylinder member 38 is fixed to the outer periphery of the inner cylinder member 40 by being crimped together with the inner cylinder member 40. In the present embodiment, the first groove 71, the second groove 72, and the third groove 73 are formed in this order from the front end side on the outer periphery of the outer cylindrical member 38 by this caulking. The first groove 71 is formed around the tip of the separator 34 on the tip side of the second vent hole 39. The second groove 72 is formed around the rear end portion of the separator 34 on the rear end side of the second ventilation hole 39. The third groove 73 is formed around the grommet 36.

  The filter 37 is held between the inner cylinder member 40 and the outer cylinder member 38 by crimping the inner cylinder member 40 and the outer cylinder member 38 at the front end side and the rear end side of the second vent hole 39. . The filter 37 can be constituted by a porous structure of a water repellent resin such as a fluorine-based resin. Since the filter 37 has water repellency, the reference gas (atmosphere) can be introduced into the internal space of the sensor element 10 without passing outside water.

C. Configuration of Lead Wire Clip FIG. 4 is an explanatory diagram showing the configuration of the lead wire clip 200. The lead wire clip 200 includes an arm part 210 and a holding part 220.

  The arm portion 210 is formed in an arc shape (in the present embodiment, an arc shape) so as to be able to fit into a groove provided on the side surface of the gas sensor 100 so as to extend in the circumferential direction. In the present embodiment, the arm part 210 includes a first arm part 211 and a second arm part 212. The first arm portion 211 is formed to fit in the first groove 71 (FIG. 2) provided in the gas sensor 100. The second arm portion 212 is formed so as to fit in the second groove 72 (FIG. 2) provided in the gas sensor 100. The circumferential tip of the first arm part 211 and the circumferential tip of the second arm part 212 are connected by a connection part 213.

  The arm portion 210 may be formed so as to fit into a groove other than the first groove 71 and the second groove 72, for example, the third groove 73 or the bent portion 20 a of the metal shell 20 (see FIG. 2). ) May be formed so as to be fitted into a groove or the like in which is formed. Further, the shape of the arm portion 210 is not limited to the arc shape as long as it can fit into the groove of the gas sensor 100, and may be formed in a U shape. In the present invention, the U-shape is also included in the “arc shape” in the claims. Moreover, as long as it can fit in the groove | channel of the gas sensor 100, a part instead of all of the arm part 210 may be formed in the arc shape.

  The holding unit 220 bends the plate body into a clip shape so that the lead wire 60 extending from the rear end of the gas sensor 100 can be held in a direction intersecting the axis O (in this embodiment, a direction perpendicular to the axis O). It is formed with. In the present embodiment, the holding unit 220 holds the lead wire 60 via the glass braided tube 61, but the holding unit 220 may hold the lead wire 60 directly. The holding part 220 and the arm part 210 are connected at their proximal ends 214. That is, the holding part 220 and the arm part 210 are integrally formed. The lead wire clip 200 can be formed by punching a metal plate using a predetermined die and bending the metal plate into the shape shown in FIG. The holding unit 220 may have a shape other than the clip shape as long as it can hold the lead wire 60. For example, the holding portion 220 may be formed in a spiral shape, and the lead wire 60 may pass through the holding portion 220.

  FIG. 5 is a cross-sectional view showing a state where the lead wire clip 200 is attached to the gas sensor 100. In FIG. 5, the cross-sectional shape along the axis O of the first arm portion 211 a and the second arm portion 212 a and the axis line of the outer cylindrical member 38 in which the first groove 71 and the second groove 72 are formed. Only the cross-sectional shape along O is shown.

  The first groove 71 includes a bottom surface 71a, a first side surface 71b that is located on the front end side in the axis O direction and rises from the bottom surface 71a, and a second side surface 71c that is located on the rear end side in the axis O direction and rises from the bottom surface 71a. And have. In the present embodiment, the first arm portion 211 a is formed so as to contact only the first side surface 71 b and the second side surface 71 c of the first groove 71. That is, the first arm portion 211a can be in line contact with the first groove 71 at two locations as shown by the circles in the drawing without contacting the bottom surface 71a. The first arm portion 211a projects the central portion of the metal plate constituting the first arm portion 211a outward from the axis O side, so that the upper end portion and the lower end portion of the metal plate are respectively the first The side surface 71b and the second side surface 71c can be contacted.

  The second groove 72 includes a bottom surface 72a, a first side surface 72b positioned on the front end side in the axis O direction and rising from the bottom surface 72a, and a second side surface 72c positioned on the rear end side in the axis O direction and rising from the bottom surface 72a. And have. In the present embodiment, the second arm portion 212 a is formed so as to contact only the bottom surface 72 a of the second groove 72. That is, the second arm portion 212a does not contact the first side surface 72b and the second side surface 72c, but is in line contact with the second groove 72 at one place as shown by a circle in the drawing. Is possible. The second arm portion 212a projects the central portion of the metal plate constituting the second arm portion 212a from the outside toward the axis O, so that the central portion of the metal plate comes into contact with the bottom surface 72a. ing.

  According to the lead wire clip 200 of the present embodiment described above, the gas sensor 100 can be obtained simply by fitting the arm portion 210 of the lead wire clip 200 into the groove formed in the gas sensor 100 and holding the lead wire 60 on the holding portion 220. The lead wire 60 extending from can be easily bent and fixed in a direction intersecting the axis O. In addition, the lead wire clip 200 can be manufactured very easily because the arm portion 210 and the holding portion 220 are integrally formed.

  Further, according to the present embodiment, the lead wire clip 200 can be attached to the gas sensor 100 by the two arm portions 211 and 212, so that the lead wire 60 can be stably held.

  Furthermore, in this embodiment, since the first arm portion 211a makes line contact with the first groove 71 at two locations, it is possible to effectively suppress the movement of the lead wire clip 200 along the axis O direction. it can. Further, since the second arm portion 212a is in line contact with the second groove 72 at one place, the shape of the second groove 72 and other shapes can be obtained by caulking to form each groove. Even when the distance from the groove changes, the second arm portion 212a and the second groove 72 can be satisfactorily brought into contact with each other. Thus, according to the lead wire clip 200 of the present embodiment, even if a manufacturing error occurs in each groove formed by caulking, the lead wire 60 is stably fixed while absorbing the error. It becomes possible.

D. Modification D1. First Modification FIG. 6 is a diagram for explaining a first modification of the sensor unit. The sensor unit of the first modification has the same gas sensor configuration as that of the present embodiment. Also, the lead wire clip has the same configuration as that of the present embodiment except for the shape of the arm portion. Therefore, in the first modification, only the arm portion of the lead wire clip will be described, and the other parts will be omitted. In the first modification, the first arm portion 211 b is in line contact with the first groove 71 at one location. The second arm portion 212b is also in line contact with the second groove 72 at one location. Both the first arm portion 211b and the second arm portion 212b project the central portion of the metal plate constituting each from the outside toward the axis O side, so that the central portion of the metal plate is in the groove of each groove. It contacts the bottom surfaces 71a and 72a. Also according to the first modified example, since the lead wire clip 200 can be attached to the gas sensor 100 by the two arm portions 211b and 212b, the lead wire 60 can be stably held.

D2. Second Modification FIG. 7 is a diagram for explaining a second modification of the sensor unit. The sensor unit of the second modification has the same gas sensor configuration as that of the present embodiment. Also, the lead wire clip has the same configuration as that of the present embodiment except for the shape of the arm portion. Therefore, in the second modification, only the arm portion of the lead wire clip will be described, and the other parts will be omitted. In the second modified example, the first arm portion 211 c is in line contact with the first groove 71 at two locations. The second arm portion 212 c is also in line contact with the second groove 72 at two locations. Both the first arm portion 211c and the second arm portion 212c project the central portion of the metal plate from the axis O side toward the outside, so that the upper end portion and the lower end portion of the metal plate have the respective grooves 71. , 72 can contact the first side surfaces 71b and 72b and the second side surfaces 71c and 72c. Also according to the second modified example, since the lead wire clip 200 can be attached to the gas sensor 100 by the two arm portions 211c and 212c, the lead wire 60 can be stably held.

D3. Third Modified Example In the above embodiment and the modified example, the lead wire clip includes two arm portions. On the other hand, as shown in FIG. 8, the lead wire clip 200d may be provided with only one arm portion 210d. Further, three or more arm portions may be provided. When three or more arm portions are provided, it is preferable that at least one of the arm portions is in line contact with the corresponding groove at two locations.

D4. Other Modifications In the embodiment and the modification described above, the lead wire clip is attached to the gas sensor. On the other hand, the lead wire clip may be attached to another sensor (for example, a temperature sensor or a humidity sensor) having a groove. The gas sensor may be provided with a heater.

  In the embodiment and the modification, one lead wire is drawn from the gas sensor 100. On the other hand, two or more lead wires may be drawn.

  The present invention is not limited to the above-described embodiments, examples, and modifications, and can be realized with various configurations without departing from the spirit thereof.

DESCRIPTION OF SYMBOLS 1 ... Sensor unit 10 ... Sensor element 10a ... Inner electrode 10b ... Electrode part 10c ... External lead part 10d ... Outer electrode 10e ... Cylindrical hole 11 ... Solid electrolyte body 12 ... Gutter part 13 ... Bottomed part 14 ... Vertical lead part 15 ... Ring Lead part 18 ... Base part 20 ... Metal fitting 20a ... Bending part 20b ... Step part 20c ... Hard part 20d ... Male thread part 29 ... Gasket 31 ... Powder filling part 32 ... Insulating member 33 ... Metal ring 34 ... Separator 35 ... Through hole 36 ... Grommet 37 ... Filter 38 ... Outer cylinder member 39 ... Second vent hole 40 ... Inner cylinder member 41 ... First vent hole 42 ... Insertion hole 50 ... Packing 60 ... Lead wire 61 ... Glass braided tube 62 ... Protector 63 ... Bending Portion 64 ... Hole 70 ... Connection terminal 71 ... First groove 71a ... Bottom surface 71b ... First side surface 71c ... Second side surface 72 ... First Groove 72a ... bottom surface 72b ... first side surface 72c ... second side surface 73 ... third groove 100 ... gas sensor 200, 200d ... lead wire clip 210,210d ... arms 211, 211a, 211b, 211c ... first Arm part 212, 212a, 212b, 212c ... 2nd arm part 213 ... Connection part 214 ... Base end 220 ... Holding part O ... Axis line

Claims (6)

A lead wire clip having a lead wire protruding rearward along the axial direction and attached to a substantially cylindrical sensor having a groove on its side surface extending in the circumferential direction,
An arcuate arm that can fit into the groove of the sensor;
A holding portion capable of holding the lead wire in a state bent in a direction intersecting the axial direction;
With
The lead wire clip, wherein the arm portion and the holding portion are integrally formed. The lead wire clip according to claim 1,
The sensor is provided with a plurality of the grooves,
A lead wire clip, wherein a plurality of the arm portions are provided so as to be able to fit into two or more of the plurality of grooves, respectively. A lead wire clip according to claim 2,
The plurality of grooves are respectively a bottom surface, a first side surface that is located on the tip end side in the axial direction and rises from the bottom surface, and a second side surface that is located on the rear end side in the axial direction and rises from the bottom surface, Have
One arm portion of the plurality of arm portions can contact the first side surface and the second side surface in one groove of the plurality of grooves.
The other arm portion of the plurality of arm portions can contact the bottom surface in another groove of the plurality of grooves. A substantially cylindrical sensor having a lead wire protruding rearward along the axial direction and having a groove on its side surface extending in the circumferential direction;
A lead clip attached to the sensor;
A sensor unit comprising:
The lead wire clip is
An arcuate arm that fits into the groove of the sensor;
A holding portion for holding the lead wire in a state bent in a direction intersecting the axial direction,
The sensor unit, wherein the arm portion and the holding portion are integrally formed. The sensor unit according to claim 4,
The sensor is provided with a plurality of the grooves,
The lead wire clip is provided with a plurality of arm portions so as to fit into two or more of the plurality of grooves, respectively. The sensor unit according to claim 5,
The plurality of grooves are respectively a bottom surface, a first side surface that is located on the tip end side in the axial direction and rises from the bottom surface, and a second side surface that is located on the rear end side in the axial direction and rises from the bottom surface, Have
One arm portion of the plurality of arm portions is in contact with the first side surface and the second side surface in one groove of the plurality of grooves,
The other arm portion of the plurality of arm portions is in contact with the bottom surface in another groove of the plurality of grooves.

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