JP4855798B2 - Temperature sensor manufacturing method and temperature sensor inspection method - Google Patents

Description

  The present invention provides a temperature sensing unit that detects the temperature of a measurement object flowing through a flow pipe, and a sensor mounting part that supports the temperature sensing part and is fixed in contact with a sensor mounting position of the flow pipe. The present invention relates to a temperature sensor manufacturing method for manufacturing a sensor, and a temperature sensor inspection method for inspecting such a temperature sensor.

  Conventionally, a temperature provided with a temperature sensing part that detects the temperature of a measurement object that circulates through the circulation pipe, and a sensor attachment part that supports the temperature sensing part and is fixed in contact with the sensor attachment position of the circulation pipe. Sensors are known (see Patent Document 1 and Patent Document 2).

  A boss member having a mounting seat is provided at the sensor mounting position of the flow pipe to which the temperature sensor is mounted. By attaching a nut member to the boss member so as to press the sensor mounting portion against the mounting seat, sensor mounting The temperature sensor is fixed to the sensor mounting position of the flow pipe in a state where the portion is in contact with the mounting seat of the boss member in the flow pipe.

  As the boss member, boss members of various shapes are adopted depending on various conditions such as the installation location, etc., but if the shape of the sensor mounting part of the temperature sensor does not correspond to the shape of the boss member, it will loosen to the sensor mounting state And problems such as a decrease in adhesion between the sensor mounting portion and the boss member may occur.

For this reason, the temperature sensor needs to be assembled after appropriately selecting the type (shape) of the sensor mounting portion according to the type of the boss member. For example, when manufacturing multiple types (part numbers) of temperature sensors using multiple types of sensor mounting parts with different shapes, selecting the appropriate type of sensor mounting parts and assembling the temperature sensor, the difference in shape It is possible to prevent a problem caused by the occurrence of the problem.
JP 2004-239716 A JP 2002-122486 A

  However, in the temperature sensor manufacturing process, if manufacturing is performed in a state where the type (shape) of the sensor mounting part is mistakenly recognized, the temperature sensor is used by using a different type of sensor mounting part than the type planned in the design. As a result, the temperature sensor may become a rejected product that is not suitable for attachment to a planned boss member.

  In particular, when the difference in the shape of each type of sensor mounting portion is a minute difference that cannot be identified by visual recognition, erroneous recognition of the sensor mounting portion is likely to occur. In particular, in the case of mass production of temperature sensors, if such an incorrect assembly of the sensor mounting portion occurs, there arises a problem that the generation rate of rejected products among the temperature sensors is increased and the manufacturing efficiency is lowered.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a temperature sensor manufacturing method capable of preventing the sensor mounting portion from being erroneously assembled, and the temperature at which the sensor mounting portion is erroneously assembled. An object is to provide a temperature sensor inspection method for detecting a sensor.

The invention method according to claim 1, which has been made to achieve this object, includes a temperature sensing part for detecting the temperature of the measurement object flowing through the flow pipe, a temperature sensing part, and a sensor mounting position of the flow pipe. A temperature sensor including a sensor mounting portion fixed in contact with the temperature sensor, and selecting a temperature sensor by selecting one of the plurality of types of sensor mounting portions having different shapes as the sensor mounting portion. A temperature sensor manufacturing method for manufacturing, wherein the sensor mounting portion is preliminarily provided with an identification marking determined according to its own shape, and a shape determination step for determining the shape of the sensor mounting portion based on the identification marking; And an assembling step for selecting a sensor mounting portion necessary for assembly based on the determination result of the shape discrimination step and assembling the selected sensor mounting portion and the temperature sensing portion to obtain a temperature sensor. And, a plurality of types of sensor mounting portion, includes a different sensor attachment portion of at least linear thermal expansion coefficient, the identification markings are determined depending on the shape and the linear thermal expansion coefficient of the sensor mounting portion, It has a thermal expansion coefficient determination process that determines the linear thermal expansion coefficient of the sensor mounting part based on the identification marking. In the assembly process, it is necessary for assembly based on the determination results of the shape determination process and the thermal expansion coefficient determination process. A temperature sensor manufacturing method characterized in that a temperature sensor is obtained by assembling a selected sensor mounting portion and assembling the selected sensor mounting portion and a temperature sensing portion.

  According to this temperature sensor manufacturing method, the sensor mounting portion in which an identification marking representing its own shape is provided in advance is used. In the shape determination step, the shape of the sensor mounting portion is determined based on the identification marking, and the determination is made. A temperature sensor is obtained by assembling the sensor mounting portion and the temperature sensing portion selected based on the result.

  Accordingly, the temperature sensor can be manufactured in a state where the type (shape) of the sensor mounting portion is correctly recognized, and the temperature sensor can be prevented from being manufactured in a state where the shape of the sensor mounting portion is erroneously recognized. .

  Therefore, according to the method of the present invention, a temperature sensor including an appropriate type (shape) of a sensor mounting portion can be manufactured, generation of rejected products can be reduced, and manufacturing efficiency can be improved. Further, according to the method of the present invention, since a correct type of sensor mounting portion is assembled, an appropriate temperature sensor according to the conditions of the sensor mounting position (such as the shape of the boss member) can be manufactured. Furthermore, in the temperature sensor installation environment, it is possible to prevent problems due to the difference in shape (such as looseness in the mounting state and a decrease in adhesion between the sensor mounting portion and the boss member).

  The identification marking can be formed, for example, as a concave or convex portion on the surface of the sensor mounting portion, and more specifically, an identification groove formed in a depressed state on the surface of the sensor mounting portion or a sensor mounting It can be formed as an identification protrusion formed in a state protruding from the surface of the part.

Furthermore, the identification marking can also be formed on the sensor mounting portion by using a stamp set in a different manner for each shape.
Further, in the shape determination step, for example, the shape of the sensor mounting portion can be determined by determining the identification marking using an optical sensor or an image determination device.

In the temperature sensor manufacturing method of the present invention , the plurality of types of sensor mounting portions include at least sensor mounting portions having different linear thermal expansion coefficients, and the identification marking includes the shape of the sensor mounting portion and the linear thermal expansion. A coefficient of thermal expansion that determines the coefficient of linear thermal expansion of the sensor mounting portion based on the identification marking. In the assembly process, the process of determining the shape and the coefficient of thermal expansion is determined. Based on the determination result, a sensor mounting part necessary for assembly is selected, and the selected sensor mounting part and the temperature sensing part are assembled to obtain a temperature sensor .

  According to this temperature sensor manufacturing method, the sensor mounting portion in which the identification marking representing not only its own shape but also its own linear thermal expansion coefficient is provided in advance, and in the thermal expansion coefficient determination step, based on the identification marking The linear thermal expansion coefficient of the sensor mounting portion is determined. Then, in the assembly process, based on the determination results of the shape determination process and the thermal expansion coefficient determination process, the sensor mounting part necessary for the assembly is selected, and the selected sensor mounting part and the temperature sensing part are assembled to install the temperature sensor. obtain.

  Therefore, the temperature sensor can be manufactured in a state where the material characteristic (linear thermal expansion coefficient) of the sensor mounting part is correctly recognized, and the temperature sensor is manufactured in a state where the material characteristic of the sensor mounting part is erroneously recognized. Can be prevented.

  Therefore, according to the method of the present invention, it is possible to manufacture a temperature sensor including a sensor mounting portion with appropriate material characteristics, to reduce the generation of rejected products, and to improve manufacturing efficiency. Further, according to the method of the present invention, since the correct type of sensor mounting portion is assembled, an appropriate temperature sensor according to the conditions of the sensor mounting position (such as the material of the boss member) can be manufactured. Furthermore, in the environment where the temperature sensor is installed, it is possible to prevent problems caused by differences in the coefficient of linear thermal expansion (such as loose mounting or occurrence of seizure).

In the thermal expansion coefficient determination step, for example, the linear thermal expansion coefficient of the sensor mounting portion can be determined by determining the identification marking using an optical sensor or an image determination device.
In the temperature sensor manufacturing method described above, the identification marking is formed as a concave or convex portion on the surface of the sensor mounting portion. In the shape determination step and the thermal expansion coefficient determination step , the identification marking is performed using an optical sensor. May be identified.
Next, in order to achieve the above-mentioned object, the invention method according to claim 3 is characterized in that a temperature sensing part for detecting a temperature of a measurement object flowing through a circulation pipe, and supporting the temperature sensing part and the circulation pipe. A temperature sensor inspection method for inspecting a temperature sensor comprising a sensor attachment portion that is fixed in contact with the sensor attachment position, wherein the temperature sensor comprises a plurality of types of sensor attachment portions having different shapes as the sensor attachment portion. The sensor mounting part is configured with any one of them, and the sensor mounting part is preliminarily provided with an identification marking determined according to its own shape, and the shape for determining the shape of the sensor mounting part based on the identification marking The plurality of types of sensor mounting portions include at least sensor mounting portions having different linear thermal expansion coefficients, and the identification marking includes the shape of the sensor mounting portion and the linear thermal expansion. Has been determined according to the coefficient, have a thermal expansion coefficient determination step of determining the linear thermal expansion coefficient of the sensor mounting portion on the basis of the identification marking is a temperature sensor inspection method according to claim.

  In this temperature sensor inspection method, a temperature sensor to be inspected is configured to include a sensor mounting portion in which an identification marking determined according to its shape is provided in advance as a sensor mounting portion. And in this temperature sensor test | inspection method, since the shape of a sensor attachment part is discriminate | determined based on the identification marking in a shape discrimination | determination process, the shape of a sensor attachment part can be discriminate | determined correctly.

That is, by using this temperature sensor inspection method, it is possible to discriminate a temperature sensor in which the sensor mounting portion is incorrectly assembled.
Therefore, according to the method of the present invention, it is possible to determine whether or not the temperature sensor has an appropriate type of sensor mounting portion assembled, and it is possible to remove the temperature sensor having an inappropriate sensor mounting portion assembled. . Further, according to the method of the present invention, it is possible to determine whether or not the temperature sensor is suitable for the sensor mounting position condition (the shape of the boss member), and the shape of the sensor mounting portion is not suitable in the temperature sensor installation environment. It is possible to prevent problems (such as occurrence of looseness in the mounting state and a decrease in adhesion between the sensor mounting portion and the boss member) caused by being appropriate.

  The identification marking can be formed, for example, as a concave or convex portion on the surface of the sensor mounting portion, and more specifically, an identification groove formed in a depressed state on the surface of the sensor mounting portion or a sensor mounting It can be formed as an identification protrusion formed in a state protruding from the surface of the part.

Furthermore, the identification marking can also be formed on the sensor mounting portion by using a stamp set in a different manner for each shape.
Further, in the shape determination step, for example, the shape of the sensor mounting portion can be determined by determining the identification marking using an optical sensor or an image determination device.

In the temperature sensor inspection method of the present invention, the plurality of types of sensor mounting portions include at least sensor mounting portions having different linear thermal expansion coefficients, and the identification marking includes the shape of the sensor mounting portion and the linear thermal expansion coefficient. Is a temperature sensor inspection method having a thermal expansion coefficient determination step of determining a linear thermal expansion coefficient of the sensor mounting portion based on the identification marking .

  In this temperature sensor inspection method, a temperature sensor to be inspected is configured to include a sensor attachment portion in which an identification marking representing not only its own shape but also its own linear thermal expansion coefficient is provided as a sensor attachment portion. Yes. And in this temperature sensor test | inspection method, in the thermal expansion coefficient discrimination | determination process, since the linear thermal expansion coefficient of a sensor attachment part is discriminate | determined based on the identification marking, the material characteristic (linear thermal expansion coefficient) of a sensor attachment part is determined. It can be determined correctly.

That is, by using this temperature sensor inspection method, it is possible to discriminate a temperature sensor in which the sensor mounting portion is erroneously assembled.
Therefore, according to the method of the present invention, it is possible to determine whether or not the temperature sensor has an appropriate type of sensor mounting portion assembled, and it is possible to remove the temperature sensor having an inappropriate sensor mounting portion assembled. . Further, according to the method of the present invention, it can be determined whether or not the temperature sensor is suitable for the sensor mounting position conditions (such as the material of the boss member). It is possible to prevent problems (such as occurrence of loose mounting or occurrence of seizure) caused by inappropriateness.

In the thermal expansion coefficient determination step, for example, the linear thermal expansion coefficient of the sensor mounting portion can be determined by determining the identification marking using an optical sensor or an image determination device.
In the above-described temperature sensor inspection method, the identification marking is formed as a concave or convex portion on the surface of the sensor mounting portion. In the shape determination step and the thermal expansion coefficient determination step , the identification marking is performed using an optical sensor. May be identified.

The preferred embodiments of the present invention will be described below.
In addition, this invention is not limited to the following embodiment at all, and it cannot be overemphasized that various forms may be taken as long as it belongs to the technical scope of this invention.

FIG. 1 is a cross-sectional view showing the internal structure of a temperature sensor 1 according to an embodiment of the present invention.
The temperature sensor 1 includes a sheath member 12 in which a pair of metal core wires 11 are insulated and held inside an outer cylinder 121, a bottomed cylindrical metal tube 2 extending in an axial direction closed at the distal end side, and electricity that changes according to temperature. A thermistor element 5 as a temperature-sensitive element capable of outputting a target characteristic as an electric signal, a pair of lead wires 6 for taking out an electric signal from the thermistor element 5, and a sensor mounting portion 13 for supporting the metal tube 2. Configured.

  The axial direction is the longitudinal direction of the temperature sensor 1 and corresponds to the vertical direction in FIG. Moreover, the front end side in the temperature sensor 1 is a lower side in the figure, and the rear end side in the temperature sensor 1 is an upper side in the figure.

Further, the temperature sensor 1 includes a nut member 14 having a hexagon nut portion 251 and a screw portion 252.
And the temperature sensor 1 is mounted | worn with the flow pipe (exhaust gas pipe etc.) in internal combustion engines, such as a vehicle, for example, and arrange | positions a temperature sensing element in the flow pipe through which measurement object gas (exhaust gas etc.) flows, It can be used for temperature detection of the measurement object gas. That is, the temperature sensor 1 corresponds to a so-called vehicle temperature sensor.

The metal tube 2 has a bottomed cylindrical shape with a closed tip, and a thermistor element 5 is accommodated in the inside of the tip.
The thermistor element 5 includes a thermistor sintered body 51 whose electrical characteristics change according to a temperature change, and a pair of electrodes 105 for outputting the electrical characteristics of the thermistor sintered body 51 as electrical signals. Yes. The pair of electrodes 105 is connected to one end 111 of the pair of metal core wires 11 in the sheath member 12.

  The sheath member 12 is provided such that the distal end side is accommodated in the metal tube 2 and the rear end side protrudes from the metal tube 2. The metal tube 2 is filled with cement 53 to prevent the thermistor element 5 and the sheath member 12 from swinging, and the sheath member 12 is stably held inside the metal tube 2. .

The joint member 4 has a cylindrical shape larger in diameter than the metal tube 2.
The sensor mounting portion 13 is formed in a cylindrical shape, and a flange portion 113 that protrudes radially outward is provided on the distal end side. A sensor-side contact surface 114 that contacts a boss-side contact surface of a boss member to be described later is formed on the distal end side of the flange portion 113.

  The sensor mounting portion 13 is joined to the metal tube 2 in a state of surrounding the outer periphery of the metal tube 2, and is joined to the joint member 4 in a state where the rear end portion of the sensor attachment portion 13 is disposed inside the front end side of the joint member 4. ing. At this time, the metal tube 2 and the joint member 4 are arranged coaxially, and are arranged so that a part on the rear end side of the metal tube 2 and a part on the front end side of the joint member 4 overlap each other. Has been.

  The sensor mounting portion 13 supports the metal tube 2. Since the sheath member 12, that is, the thermistor element 5 is held inside the metal tube 2, the sensor mounting portion 13 includes the thermistor element 5. It corresponds to the member which hold | maintains indirectly.

  A nut member 14 is rotatably disposed on the outer periphery on the front end side of the joint member 4, and the front end portion of the nut member 14 is in contact with the rear end surface of the flange portion 113 of the sensor mounting portion 13.

  The other end 112 of the pair of metal core wires 11 protruding from the rear end of the sheath member 12 is electrically connected to one end 106 of the pair of lead wires 6 through the crimping terminal 16 inside the joint member 4. Yes.

  In addition, two insulating tubes 17 are provided inside the joint member 4, and the insulating tubes 17 cover the other end 112 of the metal core wire 11, one end 106 of the lead wire 6, and the outer periphery of the crimping terminal 16, respectively. Arranged in a state. Further, a heat-resistant rubber grommet 18 is caulked and fixed to the rear end side of the joint member 4. The pair of lead wires 6 penetrates the grommet 18 and protrudes from the rear end of the joint member 4.

Next, an attachment structure for attaching the temperature sensor 1 to a flow pipe (in this embodiment, an exhaust gas pipe) will be described.
FIG. 2 is an explanatory diagram showing a cross-sectional structure of the boss member 210 with the temperature sensor 1 attached.

  The boss member 210 is welded to the exhaust gas pipe 20 to form a part of the exhaust gas pipe. In FIG. 2, a part of the exhaust gas pipe 20 is also shown as a cross-sectional view. In FIG. 2, the temperature sensor 1 is shown as an external view, not a cross-sectional view, and a part of the temperature sensor 1 on the rear end side is not shown.

The boss member 210 includes a female screw portion 211 and an insertion portion 212.
The female screw portion 211 is formed with a female screw 214 that is screwed with the screw portion 252 of the nut member 14 in the temperature sensor 1.

  The insertion portion 212 is located closer to the wall surface of the exhaust gas pipe 20 than the female screw portion 211, and an insertion hole 215 having a smaller diameter than the minimum inner diameter of the female screw portion 211 is formed. Also, a boss-side contact surface 216 is formed on a portion of the inner wall of the insertion portion 212 closer to the female screw 214 than the insertion hole 215.

  When the temperature sensor 1 (sensor mounting portion 13) is attached to the boss member 210 by screwing the nut member 14 into the female screw portion 211, the boss side contact surface 216 of the boss member 210 and the sensor side of the sensor mounting portion 13. The contact surface 114 is in close contact (contact). Thereby, the sensor mounting portion 13 is fixed to the sensor mounting position (boss member 210) of the exhaust gas pipe 20, and a gap (in other words, a gas leakage path) is generated between the temperature sensor 1 and the boss member 210. And the leakage of gas from the exhaust gas pipe 20 is prevented.

In the present embodiment, the sensor mounting portion 13 is made of SUS310S (linear thermal expansion coefficient of 17.5 × 10 ^-6 / ℃), the nut member 14 is SUS430 (coefficient of linear thermal expansion 11.9 × 10 ^{- 6} / ° C.), and the boss member 210 is made of SNB16 (linear thermal expansion coefficient 13.6 × 10 ⁻⁶ / ° C.).

  Although SUS310S and SUS430 have substantially the same appearance, SUS310S is an austenite-based material (a material having a small amount of Fe (iron) component), and SUS430 is a ferrite-based material (a large amount of Fe (iron) component). Material). That is, since SUS310S is a non-magnetic material, it has a property that cannot be attracted to the magnet, and SUS430 has a property that is attracted to the magnet because it is a magnetic material.

  Further, the temperature sensor 1 is not limited to one type of sensor mounting portion 13, and may be configured using the sensor mounting portion 13 formed in a different shape according to the shape of the boss member on the vehicle side. it can. For example, the temperature sensor 1 can be configured using one selected from a plurality of types of sensor mounting portions 13 having different shapes of the flange portions 113.

Here, FIG. 3 is an explanatory view showing the appearance of three types of sensor mounting portions 13 having different shapes of the flange portions 113 (specifically, taper angles of the sensor-side contact surfaces 114).
In the first type sensor mounting portion 13, the sensor-side contact surface 114 is formed in a tapered shape having a taper angle, and the taper angle α of the sensor-side contact surface 114 is set to 120 °.

  In the second type sensor mounting portion 13, the sensor-side contact surface 114 is formed in a tapered shape having a taper angle, and the taper angle α of the sensor-side contact surface 114 is set to 123 °.

In the third type sensor mounting portion 13, the sensor side contact surface 114 is formed in a planar shape having no taper angle.
And these 3 types of sensor attaching parts 13 are previously provided with the identification marking determined according to each shape. Note that each of the first to third type sensor mounting portions 13 in FIG. 3 includes a groove-shaped identification marking 31 formed over the entire periphery on the outer peripheral side surface of the flange portion 113.

  Among these, the 1st type sensor attachment part 13 is identified in the area | region of the front end side rather than the center position 30 in an axial direction (in the figure lower area | region in the figure) among the outer peripheral side surfaces in the flange part 113. A marking 31 is formed.

  The second type sensor mounting portion 13 has an identification marking 31 in a region on the rear end side with respect to the central position 30 in the axial direction on the outer peripheral side surface of the flange portion 113 (in the drawing, an upper region from the central position 30). Is formed.

  In the third type sensor mounting portion 13, identification markings 31 are formed on the outer peripheral side surface of the flange portion 113 in the region on the front end side with respect to the central position 30 in the axial direction and the region on the rear end side with respect to the central position 30. And an identification marking 31 composed of two identification grooves.

  By using such three types of identification markings, for example, it is possible to discriminate three types of sensor mounting portions 13 having different shapes of the flange portion 113 (specifically, the sensor-side contact surface 114). .

That is, the temperature sensor 1 can be configured using the sensor mounting portion 13 formed in a different shape according to the shape of the boss member 210.
For this reason, in order to prevent the sensor mounting portion 13 of a type different from the type planned in the design from being assembled, a determination step for determining the type of the sensor mounting portion 13 in the manufacturing process of the temperature sensor 1. To implement.

  The manufacturing method of the temperature sensor 1 will be briefly described. First, a process of assembling the sensor attachment portion 13 to the metal tube 2 is executed. At this time, before assembling the sensor attachment portion 13 to the metal tube 2, a discrimination process for discriminating the type of the sensor attachment portion 13 is performed.

  In the discrimination process, as a method for identifying the groove-shaped identification marking, for example, an irradiation target is irradiated with irradiation light, an optical sensor that captures the reflected light, an image to be identified is read, and image processing is performed. An image processing apparatus that identifies the type of identification marking can be used. In FIG. 4, the conceptual diagram of the method of identifying the identification marking of the sensor attachment part 13 using the optical sensor apparatus provided with an optical sensor is shown. In FIG. 4, the left half of the sensor mounting portion 13 is shown as a cross-sectional view.

  That is, the reflected light generated by reflecting the irradiation light irradiated from the optical sensor device 121 to the sensor mounting portion 13 changes according to the surface shape of the sensor mounting portion 13 (in other words, the type of identification marking). A method of discriminating the surface state (identification marking) of the identification object based on the difference in reflected light received by the optical sensor device 121 can be adopted.

  For example, in the manufacturing process of the temperature sensor 1 to which the first type sensor mounting portion 13 is to be assembled, the axis of the outer peripheral side surface of the flange portion 113 is based on the reflected light received by the optical sensor device 121 in the determination step. The sensor attachment part 13 in which the identification marking 31 is formed in the region on the tip side of the center position 30 in the direction is determined. And based on the discrimination | determination result, the 1st type sensor attachment part 13 is selected, and the assembly | attachment process of assembling the selected sensor attachment part 13 and the metal tube 2 is implemented.

  In the manufacturing process of the temperature sensor 1 to which the second type sensor mounting portion 13 is to be assembled, the axis line of the outer peripheral side surface of the flange portion 113 is based on the reflected light received by the optical sensor device 121 in the determination step. The sensor mounting portion 13 in which the identification marking 31 is formed in the region on the rear end side with respect to the central position 30 in the direction is determined. And based on the discrimination | determination result, the 2nd type sensor attachment part 13 is selected, and the assembly | attachment process of assembling the selected sensor attachment part 13 and the metal tube 2 is implemented.

  Furthermore, in the manufacturing process of the temperature sensor 1 to which the third type sensor mounting portion 13 is to be assembled, the axis line of the outer peripheral side surfaces of the flange portion 113 is based on the reflected light received by the optical sensor device 121 in the determination step. The sensor mounting portion 13 in which the identification marking 31 is formed in the region on the rear end side with respect to the central position 30 in the direction is determined. And based on the discrimination | determination result, the 3rd type sensor attachment part 13 is selected, and the assembly | attachment process of assembling the selected sensor attachment part 13 and the metal tube 2 is implemented.

Thereby, in the manufacturing process of the temperature sensor 1, it can prevent that the wrong kind of sensor attaching part 13 is assembled | attached.
Then, after the assembly process, the electrode 105 of the thermistor element 5 is welded to one end 111 of the metal core wire 11 in the sheath member 12 to form an element assembly. And after inject | pouring the cement of the softened state in the inside of the metal tube 2 with which the sensor attaching part 13 was assembled | attached, an element assembly is inserted in the inside of this metal tube 2. FIG. At this time, insertion is performed so that the thermistor sintered body 51 of the thermistor element 5 is disposed at a predetermined position of the metal tube 2.

  Next, heat treatment is performed for caulking the long holes toward the sheath member 12 from two locations in the outer peripheral direction of the portion located around the outer cylinder 121 of the sheath member 12 in the metal tube 2, and then solidifying the cement. I do. Thereby, the sheath member 12 and the thermistor element 5 are stably supported with respect to the metal tube 2 and eventually the sensor attachment part 13.

  In the subsequent manufacturing process, the step of connecting the metal core wire 11 and the lead wire 6 with the crimp terminal 16, the step of inserting the lead wire 6 into the grommet 18, and the joint member 4 after the sensor mounting portion 13 The process of joining to the end side, the process of joining the nut member 14 to the outer periphery of the joint member 4 (the rear end of the sensor mounting portion 13), the process of caulking and fixing the grommet 18 to the rear end of the joint member 4, etc. Thus, the temperature sensor 1 is completed.

In the present embodiment, the determination step corresponds to the shape determination step described in the claims, and the thermistor element 5 corresponds to the temperature sensitive portion.
As described above, in the manufacturing method of the temperature sensor 1 of the present embodiment, the sensor mounting portion 13 in which the identification marking 31 representing its own shape is provided in advance is used, and based on the identification marking 31 in the determination step. The shape of the sensor mounting portion 13 can be determined.

  Thereby, since the temperature sensor 1 can be manufactured in a state where the shape of the sensor mounting portion 13 is correctly recognized, the temperature sensor 1 is prevented from being manufactured in a state where the shape of the sensor mounting portion 13 is erroneously recognized. it can.

  In particular, in the present embodiment, the first-type sensor mounting portion 13 and the second-type sensor mounting portion 13 are common in that the sensor-side contact surface 114 is tapered, and the respective taper angles α Since the difference between the two is a small angle of 3 °, there is a possibility that an erroneous determination is made in visual identification. On the other hand, by determining based on the identification marking 31, the shape of the sensor mounting portion 13 can be correctly recognized.

  Therefore, according to this temperature sensor manufacturing method, the temperature sensor 1 including the sensor mounting portion 13 having an appropriate shape can be manufactured, generation of rejected products can be reduced, and manufacturing efficiency can be improved. Moreover, according to this temperature sensor manufacturing method, since the correct type of sensor mounting portion 13 is assembled, it is possible to manufacture an appropriate temperature sensor 1 according to the sensor mounting position conditions (such as the shape of the boss member). Furthermore, in the installation environment of the temperature sensor 1, it is possible to prevent problems caused by the difference in shape (such as occurrence of looseness in the mounting state and a decrease in adhesion between the sensor mounting portion and the boss member).

  In the above embodiment, the embodiment in which the determination process for determining the sensor mounting portion 13 is executed in the manufacturing process of the temperature sensor has been described. However, the execution timing of the determination process is not limited to the manufacturing process. It may be executed between the completion of the temperature sensor and the installation time of the temperature sensor.

  For example, in an inspection process for inspecting the temperature sensor 1 after completion and an inspection process before attaching the temperature sensor 1 to the sensor attachment position of the exhaust gas pipe 20, a discrimination process for discriminating the sensor attachment portion 13 based on the identification marking. May be executed.

  In this temperature sensor inspection method, the temperature sensor 1 to be inspected is configured as a sensor attachment portion 13 having a sensor attachment portion in which an identification marking 31 representing its own shape is provided in advance. And in this temperature sensor test | inspection method, since the shape of the sensor attachment part 13 is discriminate | determined based on the identification marking 31 in a shape discrimination | determination process, the shape of the sensor attachment part 13 can be discriminate | determined correctly.

That is, by using this temperature sensor inspection method, it is possible to determine the temperature sensor 1 in which the sensor mounting portion 13 has been assembled by mistake.
Therefore, according to this temperature sensor inspection method, it can be determined whether or not the temperature sensor 1 has an appropriate type of sensor mounting portion 13 assembled, and the temperature sensor 1 with an improper sensor mounting portion 13 assembled can be determined. It can be removed. Further, according to this temperature sensor inspection method, it can be determined whether or not the temperature sensor 1 is appropriate according to the conditions of the sensor mounting position (such as the shape of the boss member). It is possible to prevent problems caused by the inappropriate shape of the portion 13 (occurrence of looseness in the mounting state, decrease in adhesion between the sensor mounting portion and the boss member, etc.).

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can take a various aspect.
For example, the identification markings are not limited to those determined only according to the shape of the sensor mounting portion, but can also be determined according to the shape and material characteristics (linear thermal expansion coefficient, etc.) of the sensor mounting portion.

  In other words, when multiple types of sensor mounting parts include sensor mounting parts that differ not only in shape but also in material properties (such as linear thermal expansion coefficient), depending on the shape of the sensor mounting part and the linear thermal expansion coefficient The type of the sensor mounting portion can be identified based on the determined identification marking.

  And as a discrimination process in the sensor manufacturing process, in addition to the shape discrimination process for discriminating the shape of the sensor mounting portion based on the identification marking, the thermal expansion coefficient discrimination for discriminating the linear thermal expansion coefficient of the sensor mounting portion based on the identification marking It is good to execute the process. Then, in the assembly process, based on the determination results of the shape determination process and the thermal expansion coefficient determination process, the sensor mounting part necessary for the assembly is selected, and the selected sensor mounting part and the temperature sensing part are assembled to install the temperature sensor. Good to get.

  According to such a temperature sensor manufacturing method, a sensor mounting portion in which an identification marking representing not only its own shape but also its own linear thermal expansion coefficient is provided is used. Based on this, it becomes possible to determine the linear thermal expansion coefficient of the sensor mounting portion.

  Accordingly, the temperature sensor can be manufactured in a state where the material characteristics (linear thermal expansion coefficient) of the sensor mounting portion are correctly recognized, and the temperature sensor is manufactured in a state where the material characteristics of the sensor mounting portion are erroneously recognized. Can be prevented.

For example, SUS310S (linear thermal expansion coefficient 17.5 × 10 ⁻⁶ / ° C.) and SUS430 (linear thermal expansion coefficient 11.9 × 10 ⁻⁶ / ° C.) have different linear thermal expansion coefficients. The sensor mounting portion 13 and the sensor mounting portion 13 made of SUS430 can be discriminated based on the identification marking.

  Therefore, according to such a sensor manufacturing method, a temperature sensor provided with a sensor mounting portion having appropriate material characteristics can be manufactured, generation of rejected products can be reduced, and manufacturing efficiency can be improved. Moreover, according to this sensor manufacturing method, since the correct type of sensor mounting portion is assembled, an appropriate temperature sensor according to the conditions of the sensor mounting position (such as the material of the boss member) can be manufactured. Furthermore, in the environment where the temperature sensor is installed, it is possible to prevent problems caused by differences in the coefficient of linear thermal expansion (such as loose mounting or occurrence of seizure).

In the thermal expansion coefficient discrimination step, the linear thermal expansion coefficient of the sensor mounting portion can be discriminated by discriminating the identification marking using an optical sensor, as in the shape discrimination step described above.
In addition, although embodiment which performs the discrimination | determination process for discriminating the sensor attachment part 13 in the manufacturing process of a temperature sensor as embodiment which has a thermal expansion coefficient discrimination | determination process was demonstrated, the execution timing of a discrimination | determination process is the manufacturing process. The present invention is not limited, and may be executed between the completion of the temperature sensor and the installation time of the temperature sensor.

  For example, in the inspection process for inspecting the completed temperature sensor 1 or the inspection process before attaching the temperature sensor 1 to the sensor attachment position, a determination process for determining the sensor attachment portion 13 based on the identification marking may be executed. .

  In this temperature sensor inspection method, the temperature sensor 1 to be inspected is configured to include, as the sensor attachment portion 13, a sensor attachment portion in which an identification marking 31 representing its own shape and its own linear thermal expansion coefficient is provided in advance. ing. In this temperature sensor inspection method, the shape and the linear thermal expansion coefficient of the sensor mounting portion 13 are determined based on the identification marking 31 in the determination step (shape determination step and thermal expansion coefficient determination step). The shape and linear thermal expansion coefficient of the attachment portion 13 can be correctly determined.

That is, by using this temperature sensor inspection method, it is possible to determine the temperature sensor 1 in which the sensor mounting portion 13 has been assembled by mistake.
Therefore, according to this temperature sensor inspection method, it can be determined whether or not the temperature sensor 1 has an appropriate type of sensor mounting portion 13 assembled, and the temperature sensor 1 with an improper sensor mounting portion 13 assembled can be determined. It can be removed. Further, according to this temperature sensor inspection method, it can be determined whether or not the temperature sensor 1 is appropriate according to the conditions of the sensor mounting position (such as the shape and material of the boss member). It is possible to prevent problems (such as occurrence of looseness of attachment state, occurrence of seizure, deterioration of adhesion between the sensor attachment portion and the boss member) caused by an inappropriate shape and material of the sensor attachment portion 13.

  Next, the form of the identification marking is not limited to that shown in FIG. 3, and other forms can be adopted. FIG. 5 is an explanatory diagram of the fourth to sixth type sensor mounting portions 13.

  In each of the fourth to sixth type sensor mounting portions 13 in FIG. 5, groove-shaped identification markings 31 extending in the axial direction (vertical direction in the drawing) are formed on the outer peripheral side surface of the flange portion 113.

  The fourth type sensor mounting part 13 is provided with an identification marking 31 consisting of one identification groove, and the fifth type sensor mounting part 13 is provided with an identification marking 31 consisting of two identification grooves, The sixth type sensor mounting portion 13 includes an identification marking 31 including three identification grooves.

In this way, by using a plurality of types of identification markings having different numbers of identification grooves, for example, it is possible to determine a plurality of types of sensor mounting portions 13 having different shapes.
Further, the identification marking is not limited to the concave identification groove, and may be formed in a convex shape, or may be a combination of concave and convex shapes.

  Further, the identification marking may be provided separately with an identification marking for shape discrimination and an identification marking for thermal expansion coefficient discrimination. For example, a lateral identification groove as shown in FIG. 3 is used as an identification marking for shape discrimination, and a vertical identification groove as shown in FIG. 5 is formed as an identification marking for thermal expansion coefficient discrimination in the sensor mounting portion. To do.

  When the identification marking is formed in this way, the shape and the thermal expansion coefficient of the sensor mounting portion can be identified by separately executing the shape determination step and the thermal expansion coefficient determination step.

  Alternatively, the identification marking may be determined in advance so that both the shape and the coefficient of thermal expansion can be identified. For example, when there are three types of sensor mounting portions and two types of thermal expansion coefficients of the sensor mounting portion, the total number of combinations of shapes and thermal expansion coefficients is six (= 3 × 2). From the above, identification markings corresponding to each of the six types are determined in advance. In this case, by specifying the type of identification marking, it is possible to specify both the shape of the sensor mounting portion and the thermal expansion coefficient.

It is sectional drawing which shows the internal structure of a temperature sensor. It is explanatory drawing showing the cross-section of the boss | hub member in the state where the temperature sensor was attached. It is explanatory drawing showing the external appearance of three types of sensor attaching parts from which the shape of a flange part differs. It is a conceptual diagram of the method of identifying the identification marking of a sensor attachment part using an optical sensor. It is explanatory drawing of the 4th-6th type sensor attachment part in which the identification marking was formed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Temperature sensor, 2 ... Metal tube, 4 ... Joint member, 5 ... Thermistor, 6 ... Lead wire, 11 ... Metal core wire, 12 ... Sheath member, 13 ... Sensor attaching part, 14 ... Nut member, 16 ... Clamping terminal , 17 ... Insulating tube, 31 ... Identification marking, 114 ... Sensor side contact surface, 210 ... Boss member, 216 ... Boss side contact surface, 251 ... Hex nut part, 252 ... Screw part.

Claims (4)

A temperature sensor comprising: a temperature sensing unit that detects a temperature of a measurement object flowing through the flow pipe; and a sensor mounting portion that supports the temperature sensing section and is fixed in contact with a sensor mounting position of the flow pipe. a method, wherein the sensor mounting portion, a temperature sensor manufacturing method for manufacturing a temperature sensor by selecting one required for assembly of the sensor mounting portion of the plurality of types of different shapes,
The sensor mounting portion is provided in advance with an identification marking determined according to its own shape,
A shape determination step of determining the shape of the sensor mounting portion based on the identification marking;
Based on the determination result of the shape determination step, the sensor mounting portion required for assembly is selected, and the temperature sensor is assembled by assembling the selected sensor mounting portion and the temperature sensing portion; and
Have
The plurality of types of sensor mounting parts include at least sensor mounting parts having different linear thermal expansion coefficients ,
The identification marking is determined according to the shape and linear thermal expansion coefficient of the sensor mounting portion,
A thermal expansion coefficient determination step of determining a linear thermal expansion coefficient of the sensor mounting portion based on the identification marking;
In the assembling step, the sensor attaching portion necessary for assembling is selected based on the determination results of the shape discriminating step and the thermal expansion coefficient discriminating step, and the selected sensor attaching portion and the temperature sensing portion are assembled. To obtain a temperature sensor
A method for manufacturing a temperature sensor. The identification marking is formed as a concave or convex portion on the surface of the sensor mounting portion,
In the shape determination step and the thermal expansion coefficient determination step, using an optical sensor, the identification marking is identified,
The temperature sensor manufacturing method according to claim 1. Inspecting a temperature sensor comprising: a temperature sensing part for detecting the temperature of the measurement object flowing through the flow pipe; and a sensor mounting part that supports the temperature sensing part and is fixed in contact with the sensor mounting position of the flow pipe. A temperature sensor inspection method for
The temperature sensor is configured to include any one of a plurality of types of sensor mounting portions having different shapes as the sensor mounting portion,
The sensor mounting portion is provided in advance with an identification marking determined according to its own shape,
While having a shape determination step of determining the shape of the sensor mounting portion based on the identification marking,
The plurality of types of sensor mounting parts include at least sensor mounting parts having different linear thermal expansion coefficients,
The identification marking is determined according to the shape and linear thermal expansion coefficient of the sensor mounting portion,
Having a thermal expansion coefficient determination step of determining a linear thermal expansion coefficient of the sensor mounting portion based on the identification marking;
A temperature sensor inspection method characterized by the above. The identification marking is formed as a concave or convex portion on the surface of the sensor mounting portion,
In the shape determination step and the thermal expansion coefficient determination step, using an optical sensor, the identification marking is identified,
The temperature sensor inspection method according to claim 3.

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