JP4061204B2 - Manufacturing method of temperature sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a temperature sensor and a manufacturing method thereof.
[0002]
[Prior art]
Conventionally, a temperature sensor described in Patent Document 1 is known. This temperature sensor is provided in the exhaust passage of the vehicle and is used to detect the temperature of the exhaust gas. This temperature sensor includes a metal cover, a flange, a nut, an outer cylinder and a grommet, a thermistor as a temperature sensitive element, and a sheath pin. The metal cover is closed at the front end side, and is fixed on one end side of the sheath pin. The thermistor which detects temperature and outputs it as an electrical signal to the first electrode and the second electrode is housed in the metal cover. The sheath pin includes a cylindrical sheath and a first core wire and a second core wire provided in an insulated state in the sheath. In the metal cover, the first core wire of the sheath pin is connected to the first electrode of the thermistor, and the second core wire of the sheath pin is connected to the second electrode of the thermistor. The first and second electrodes and the first and second core wires are attached to an insulating holder inserted between the thermistor and the sheath of the sheath pin in the metal cover.
[0003]
According to this temperature sensor, since the first and second electrodes are held by the insulating holder, even if vibration is applied to the thermistor due to vehicle vibration or the like, vibration of the first and second electrodes is suppressed. Therefore, in this temperature sensor, the earthquake resistance of the first and second electrodes is improved, and disconnection of the first and second electrodes can be prevented.
[0004]
[Patent Document 1]
JP 2002-267547 A
[0005]
[Problems to be solved by the invention]
However, in the above conventional temperature sensor, after welding the overlapping portion of the first and second electrodes and the first and second core wires by laser welding or the like, the first and second electrodes and the first and second core wires are attached to the insulating holder. Yes. Therefore, a jig that is used only for welding the first and second electrodes and the first and second core wires is required separately. Furthermore, since the insulating holder is composed of two divided members that are divided along the axial direction of the hole at a portion corresponding to the hole, the number of parts increases. For these reasons, this temperature sensor leads to an increase in manufacturing cost. Further, in this temperature sensor, when the first and second electrodes and the first and second core wires are attached to the insulating holder, the holes are also divided so that the first and second electrodes and the first and second electrodes are formed. The core wire is likely to be displaced with respect to the divided holes, and the first and second electrodes and the first and second core wires are sandwiched between the divided members, which may impair insulation.
[0006]
The present invention has been made in view of the above-described conventional circumstances, and the temperature at which the first and second electrodes and the first and second core wires are reliably insulated from each other and the manufacturing cost can be reduced. Providing a sensor is an issue to be solved.
[0011]
[Means for Solving the Problems]
  FirstThe manufacturing method of the temperature sensor of the invention includes a bottomed cylindrical metal cover having a closed tip, a temperature sensing element capable of detecting the temperature and outputting the electric signal to the first electrode and the second electrode, and insulating inside A first step of preparing at least a sheath pin provided with a first core wire and a second core wire in a state;
[0012]
  A single insulating holder having a partition part that separates both sides in an insulated state, a first insertion port that opens on one side of the partition part, and a second insertion port that opens on the other side of the partition partThe inner diameter of the first insertion port is formed substantially equal to the sum of the outer diameter of the first electrode and the outer diameter of the first core wire, and the inner diameter of the second insertion port is the second Insulating holder formed substantially equal to the sum of the outer diameter of the electrode and the outer diameter of the second core wireA second step of preparing
[0013]
  In the first insertion port of the insulating holderThe overlapping portion between the first electrode and the first core wire is exposed to the opening side of the first insertion port.The first electrode and the first core wire are inserted and overlappedWhileIn the second insertion slotThe overlapping portion of the second electrode and the second core wire is exposed on the opening side of the second insertion port.A third step of inserting and overlapping the second electrode and the second core wire;
[0014]
  The first electrode positioned in the first insertion port of the insulating holder and the first core wireSaidThe overlapping portion is joined, and the second electrode located in the second insertion port and the second core wireSaidA fourth step of joining the overlapping portions;
[0015]
  The thermosensitive element is housed in the metal cover together with the insulating holder, and a fifth step of fixing the metal cover and the sheath pin is provided.
  Further, the manufacturing method of the temperature sensor of the second invention includes a bottomed cylindrical metal cover having a closed end, a temperature sensing element capable of detecting the temperature and outputting the electric signal to the first electrode and the second electrode. A first step of preparing at least a sheath pin provided with a first core wire and a second core wire in an insulated state inside;
  Preparing a single insulating holder having a partition part that separates both sides in an insulated state, a first insertion port that opens on one side of the partition part, and a second insertion port that opens on the other side of the partition part; Process,
  In the first insertion port of the insulating holder, the first electrode and the first core wire are arranged so that the smaller outer diameter of the first electrode or the first core wire is located on the opening side of the first insertion port. And inserting the second electrode and the second core so that the smaller outer diameter of the second electrode or the second core wire is located on the opening side of the second insertion port. A third step of inserting and overlapping the second core wire;
  The overlapping portion between the first electrode located in the first insertion port of the insulating holder and the first core wire is joined, and the overlapping portion between the second electrode located in the second insertion port and the second core wire A fourth step of bonding
  The thermosensitive element is housed in the metal cover together with the insulating holder, and a fifth step of fixing the metal cover and the sheath pin is provided.
[0016]
  1st and 2ndIn the manufacturing method of the invention, first, in the first step, a metal cover whose tip is closed, a temperature sensing element capable of detecting the temperature and outputting it as an electrical signal to the first electrode and the second electrode, and an insulating state inside. At least a sheath pin provided with a first core wire and a second core wire is prepared. Also, in the second step, a single insulation having a partition part that separates both sides in an insulated state, a first insertion port that opens on one side of the partition part, and a second insertion port that opens on the other side of the partition part Prepare a holder.
[0017]
In the third step, the first electrode and the first core wire are inserted and overlapped in the first insertion port of the insulating holder, and the second electrode and the second core wire are inserted and overlapped in the second insertion port. When inserting and overlapping, it is also possible to insert the first electrode and the first core wire in a state where the second electrode and the second core wire are overlapped. At this time, in the present invention, a pair of insertion openings for inserting and arranging the first electrode and the first core wire and the second electrode and the second core wire are formed by overlapping the insulating holders divided as in the prior art. Instead, the single insulating holder is recessed with a partitioning portion. For this reason, both can be overlap | superposed, inserting a 1st electrode, a 1st core wire, a 2nd electrode, and a 2nd core wire into each insertion port easily. Further, after each electrode and each core wire are inserted (arranged) into each insertion port, the periphery of the electrode and the core wire is surrounded by the inner peripheral surface of the insertion port, so that the displacement of the electrode and the core wire in the insertion port is unlikely to occur. Thus, it is possible to satisfactorily join the overlapping portion between the electrode and the core wire in the fourth step described later. Furthermore, since the pair of insertion openings are formed (recessed) in such a way as to open on both sides of the partition part with respect to a single insulating holder, the state in which the electrodes and core wires are inserted into each insertion opening can be obtained by image processing or the like. It is easy to confirm, and it becomes possible to reliably join the electrode and the core wire in the fourth step described later.
[0018]
And in a 4th process, the overlapping part of the 1st electrode and 1st core wire which are located in the 1st insertion slot of an insulating holder is joined, and the overlapping part of the 2nd electrode and 2nd core wire which are located in the 2nd insertion slot Join. In other words, in the manufacturing method of the present invention, the insulating holder serves to insulate the first and second electrodes and the first and second core wires from each other when the temperature sensor is actually used. And a jig for joining the second electrode and the second core wire. Therefore, it is not necessary to separately prepare a jig for joining the first electrode and the first core wire and the second electrode and the second core wire as in the prior art. Further, since the first electrode and the first core wire are inserted into the first insertion port, and the second electrode and the second core wire are further inserted into the second insertion port, the bonding operation is performed. Can be done easily.
[0019]
  Thereafter, in the fifth step, the temperature sensitive element is housed in the metal cover together with the insulating holder, and the metal cover and the sheath pin are fixed. In this way, a temperature sensor is obtained.
  And in the temperature sensor obtained by the manufacturing method of the temperature sensor of 1st, 2nd invention, since an insulation holder consists of a single member, a number of parts reduces. In addition, since this temperature sensor includes a single insulating holder having a first insertion port that opens on one side of the partition portion and a second insertion port that opens on the other side of the partition portion, the first electrode and the first electrode The one core wire, the second electrode, and the second core wire can be separated by a partition part of a single insulating holder, and the joint between the first electrode and the first core wire and the second electrode and the second core wire The joint portion can be reliably arranged in each insertion port. Therefore, the electrode and the core wire are hardly displaced with respect to the insertion opening of the insulating holder, and the first electrode and the first core wire are reliably insulated from the second electrode and the second core wire. Therefore, in the temperature sensor of the first and second inventions, the first and second electrodes and the first and second core wires are reliably insulated from each other, and the cost can be reduced.
[0020]
The joining method in the fourth step is not particularly limited, and examples thereof include laser welding, argon welding, brazing joining, and the like. In order to obtain a good welding strength between the electrode and the core wire, and considering that the electrode and the core wire located in a narrow region such as the insertion opening are joined to each other, laser welding may be employed. preferable.
[0021]
  Also,In the manufacturing method of the first invention,Above2In the process, the inner diameter of the first insertion port (second insertion port) is formed substantially equal to the sum of the outer diameter of the first electrode (second electrode) and the outer diameter of the first core wire (second core wire). One insulating holder is prepared, and the overlapping portion of the first electrode (second electrode) and the first core wire (second core wire) is the opening side of the first insertion port (second insertion port) in the third step. Both are inserted into the first insertion slot (second insertion slot) so as to be exposed toTheBy doing so, in the fourth step, it is possible to maintain the contact state between the electrode and the core wire in the insertion port without performing a pressing work for maintaining contact with the overlapping portion (joint surface) of the core wire, Bonding can be reliably performed on the overlapping portion of the electrode and the core wire, and the bonding operation can be simplified.
[0022]
  Also,In the manufacturing method of the second invention,In the third step, the first electrode (second electrode) and the first core wire (second core wire) are overlapped in the opening direction of the first insertion port (second insertion port) (direction orthogonal to the axial direction of the insulating holder). If the first electrode (second electrode) or the first core wire (second core wire) has a smaller outer diameter, both are positioned on the opening side of the first insertion port (second insertion port). PlaceTheBy doing so, it becomes possible to confirm the arrangement position of the electrode and the core wire well by image processing or the like before joining the overlapping portion of the electrode and the core wire in the fourth step. However, it is possible to perform the dashi accurately, and thus, it is possible to satisfactorily join the overlapping portion between the electrode and the core wire.
[0023]
  1st and 2ndIn the temperature sensor of the invention, it is preferable that the relationship D−d ≦ 0.2 mm is satisfied, where d is the maximum outer diameter of the insulating holder and D is the inner diameter of the metal cover corresponding to the position of the maximum outer diameter. . Thus, since the insulating holder is suitably held in the metal cover, even if vibration is applied to the temperature sensor itself, the insulating holder can be prevented from shaking by the inner peripheral surface of the metal cover. The vibrations of the electrode and the first and second core wires are effectively suppressed, and disconnection of the first and second electrodes and the first and second core wires can be prevented.
[0024]
  1st and 2ndIn the temperature sensor of the invention, the insulating holder may be one in which the first insertion port and the second insertion port are open in the same direction. If the first insertion port and the second insertion port of the insulation holder are open in the same direction, the first electrode, the first core wire, the second electrode, and the second core wire are inserted into the first and second insertion ports of the insulation holder. Then, since the first electrode, the first core wire, the second electrode, and the second core wire can be continuously welded as they are, workability is good. In this case, the cross-sectional shape orthogonal to the axial direction of the insulating holder can be substantially E-shaped. An insulating holder having a substantially E-shaped cross section perpendicular to the axial direction has a simple structure and can be manufactured relatively easily.
[0025]
  Also,1st and 2ndIn the temperature sensor of the invention, the insulating holder may be one in which the first insertion port and the second insertion port are open in the opposite directions. If the first insertion port and the second insertion port of the insulating holder are opened in the opposite directions, the insulation between the first electrode, the first core wire, the second electrode, and the second core wire is particularly good. As such an insulating holder, one having a substantially H-shaped or substantially S-shaped cross-section perpendicular to the axial direction can be adopted.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
  Less than,1st and 2ndEmbodiments 1 to 3 embodying a temperature sensor, a manufacturing method thereof, and an insulating holder for a temperature sensor will be described with reference to the drawings.
[0027]
(Embodiment 1)
FIG. 1 shows a partially broken sectional view of the temperature sensor 100 of the first embodiment. The temperature sensor 100 is provided in the exhaust passage of the vehicle and is used to detect the temperature of the exhaust gas over a wide range. This temperature sensor includes a metal cover 1, a flange 12, a nut 13, an outer cylinder 10 and a grommet 18, a thermistor 2 as a temperature sensitive element, and a sheath pin 3.
[0028]
  As shown in FIG. 2, the bottomed cylindrical metal cover 1 made of metal such as stainless steel is composed of a detail 1a and a large diameter portion 1b. The tip of the detail 1a is closed, and the large diameter portion 1b has an opening. Have. The opening side of the large diameter portion 1b is put on the outer surface of the one end side 3a of the sheath pin 3, and is fixed by all-around laser welding. The detail 1a of the metal cover 1 is provided with a thermistor 2 that detects the temperature and outputs it as an electrical signal to the first electrode 2a and the second electrode 2b (formed from a Pt—Rh alloy wire or the like). The seaspin 3 is a cylindrical sheath made of a metal such as stainless steel.WithinThe first core wire 4 and the second core wire 5 are stored in the two core wires 4, 5 and the sheet.WithInsulating powder such as silica is filled in between. In the metal cover 1, one end side 4 a of the first core wire 4 of the sheath pin 3 is connected to the first electrode 2 a of the thermistor 2 by laser welding, and one end side 5 a of the second core wire 5 of the sheath pin 3 is connected to the second electrode of the thermistor 2. 2b is connected by laser welding. The first and second electrodes 2a and 2b and the one end sides 4a and 5a of the first and second core wires 4 and 5 are alumina inserted between the thermistor 2 and the one end side 3a of the sheath pin 3 in the metal cover 1. It is attached to an insulating holder 6 made of In the temperature sensor 100 of the first embodiment, when the maximum outer diameter of the insulating holder 6 is d and the inner diameter of the metal cover 1 corresponding to the position of the maximum outer diameter is D, D−d = 0.1 It is designed to be (mm) and has a structure in which the vibration of the insulating holder 6 due to vibration can be effectively suppressed by the inner peripheral surface of the metal cover 1.
[0029]
As shown in FIG. 3, the insulating holder 6 is made of insulating ceramics that is a single member having a substantially cylindrical shape, and has a substantially E-shaped cross section perpendicular to the axial direction. The first insertion port 6a and the second insertion port 6b that open in the same direction on the peripheral surface are recessed in parallel to the axial direction, and a partition 6d is formed between the first insertion port 6a and the second insertion port 6b. Has been. The width t2 of the partition 6d is 0.1 mm or more in consideration of mechanical strength and the like.
[0030]
Further, as shown in FIG. 1, the sheath pin 3 is fixed to the flange 12 in a state where the other end side 3 b of the sheath pin 3 is inserted inside the flange 12. The flange 12 includes a sheath portion 12b extending in the axial direction and a projecting portion 12a that is located on one end side of the sheath portion 12b and projects outward in the radial direction. The projecting portion 12a is formed in an annular shape having a seating surface 12c having a tapered shape corresponding to a taper portion of an attachment portion of an exhaust pipe (not shown) on one end side, and the seating surface 12c is in close contact with the taper portion of the attachment portion. Thus, the exhaust gas is prevented from leaking outside the exhaust gas pipe. The sheath pin 3 is press-fitted into the flange 12 and is fixed without gaps by all-around laser welding. Around the flange 12, a nut 13 having a hexagonal nut portion 13a and a screw portion 13b is rotatably fitted. The temperature sensor 1 is fixed by a nut 13 with the seating surface 12c of the projecting portion 12a of the flange 12 in contact with the mounting portion of the exhaust pipe. In addition, one end side 10a of the cylindrical outer cylinder 10 is coaxially joined (for example, all-around laser welding) to the radially outer side of the sheath 12b of the flange 12 in an airtight state. In the outer cylinder 10, the other end sides 4 b and 5 b of the first and second core wires 4 and 5 are caulked by one end sides 14 a and 15 a of the first and second lead wires 14 and 15 and a crimping terminal 16. The other end sides 4b and 5b and the one end sides 14a and 15a are covered with an insulating tube 17 together with crimping terminals 16. A heat-resistant rubber grommet 18 in which first and second lead wire insertion ports 18a and 18b for inserting the first and second lead wires 14 and 15 are formed inside the other end side 10b of the outer cylinder 10. Is arranged and the grommet 18 is fixed to the outer cylinder 10 by caulking the other end side 10b radially inward.
[0031]
A method for manufacturing the temperature sensor 100 will be described. First, the metal cover 1, the thermistor 2, and the sheath pin 3 are prepared in the first step, and the insulating holder 6 is prepared in the second step.
[0032]
In the third step, the first electrode 2a and the first core wire 4 are inserted and overlapped in the first insertion port 6a of the insulating holder 6, and the second electrode 2b and the second core wire 5 are inserted into the second insertion port 6b. Insert and overlay.
[0033]
In the first embodiment, when the outer diameters of the first and second electrodes 2a and 2b and the first and second core wires 4 and 5 are compared, the first and second electrodes 2a and 2b are adjusted to be smaller. Yes. Therefore, when the first electrode 2a and the first core wire 4 are inserted and overlapped in the first insertion opening 6a, the first electrode 2a is inserted so as to be positioned on the opening side of the first insertion opening 6a. By inserting and arranging the first electrode 2a and the first core wire 4 in the first insertion port 6a in this way, the overlapping portion of the first electrode 2a and the first core wire 4 is joined in the fourth step described later. In the previous stage, both positions can be accurately positioned. The same applies to the insertion of the second electrode 2b and the second core wire 5 into the second insertion port 6b.
[0034]
Further, in the insulating holder 6 according to the first embodiment, the width becomes narrower toward the outside on the side where the first and second electrodes 2a and 2b and the first and second core wires 4 and 5 are inserted in the partition 6d. A chamfered portion (C surface which is a chamfered portion in the first embodiment) 6c is formed. By forming the chamfered portion 6c in the partition portion 6d in this way, in the third step, the first and second electrodes 2a and 2b and the first and second core wires 4 and 5 with respect to the first and second insertion ports 6a and 6b are formed. Insertion can be performed smoothly.
[0035]
Further, in the fourth step, the overlapping portion of the first electrode 2a located in the first insertion opening 6a of the insulating holder 6 and the first core wire 4 is joined, and the second electrode 2b located in the second insertion opening 6b. And the overlapping portion of the second core wire 5 are joined.
[0036]
  In the fifth step, the thermistor 2 is housed in the metal cover 1 together with the insulating holder 6, and the one end side 3 a of the sheath pin 3 and the metal cover 1 areLarge diameter partThe overlapping part with 1b is fixed by laser welding all around. Thereafter, the other ends 4b and 5b of the first and second core wires 4 and 5 and the one ends 14a and 15a of the first and second lead wires 14 and 15 are connected by caulking terminals 16 and covered with an insulating tube 17, and then the outer cylinder 10, the flange 12, the nut 13, and the grommet 18 are assembled, and the temperature sensor 100 is completed.
[0037]
In the temperature sensor 100 of the first embodiment configured as described above, the temperature of the exhaust gas is transmitted to the thermistor 2 through the details 1a of the metal cover 1, and the resistance value of the thermistor 2 changes according to the temperature. The resistance of the thermistor 2 is taken out from the first and second lead wires 14 and 15 through the first and second electrodes 2a and 2b and the first and second core wires 4 and 5 as an electric signal. In this way, the temperature of the exhaust gas can be detected by the electrical signal taken out from the first and second lead wires 14 and 15.
[0038]
In this temperature sensor 100, the overlapping portion between the first electrode 2a and the one end side 4a of the first core wire 4 is positioned and laser-welded in the first insertion port 6a of the insulating holder 6, and the second electrode 2b and the second electrode 2b are connected to each other. The one end side 5a of the core wire 5 is positioned in the second insertion port 6b of the insulating holder 6 and laser welded. That is, the insulating holder 6 also serves as a jig for welding the first and second electrodes 2 a and 2 b and the first and second core wires 4 and 5. Therefore, it is not necessary to separately prepare a jig for welding the first and second electrodes 2a and 2b and the first and second core wires 4 and 5. Laser welding is performed with the first electrode 2 a, one end side 4 a of the first core wire 4, the second electrode 2 b, and one end side 5 a of the second core wire 5 inserted into the first and second insertion ports 6 a and 6 b of the insulating holder 6. it can. Therefore, the laser welding operation is easy.
[0039]
Moreover, in this temperature sensor 100, since the insulating holder 6 consists of a single member, the number of parts decreases.
[0040]
Furthermore, in this temperature sensor 100, the one end side 4a of the first electrode 2a and the first core wire 4 and the one end side 5a of the second electrode 2b and the second core wire 5 are separated from each other by the partition portion 6d of the single insulating holder 6. Since no work mistake occurs, the two are reliably insulated from each other.
[0041]
Further, in this temperature sensor 100, one end side 4 a of the first electrode 2 a and the first core wire 4 and one end side 5 a of the second electrode 2 b and the second core wire 5 are held on the metal cover 1 by the insulating holder 6. Therefore, the vibrations of the first and second electrodes 2a and 2b and the first and second core wires 4 and 5 when vibration is applied to the thermistor 2 without fixing the thermistor 2 and the like in the metal cover 1 using cement. Therefore, the manufacturing cost can be reduced and the first and second electrodes 2a and 2b and the first and second core wires 4 and 5 can be prevented from being disconnected.
[0042]
Furthermore, in this temperature sensor 100, since the first insertion port 6a and the second insertion port 6b of the insulating holder 6 are opened in the same direction, the first electrode 2a, the one end side 4a of the first core wire 4 and the second After the electrode 2b and the one end side 5a of the second core wire 5 are inserted into the first and second insertion ports 6a and 6b of the insulating holder 6, the first electrode 2a, the one end side 4a of the first core wire 4 and the second one are left as they are. Since the electrode 2b and the one end side 5a of the second core wire 5 can be continuously laser-welded, workability is good. In particular, since the shape of the cross section perpendicular to the axial direction of the insulating holder 6 is substantially E-shaped, the structure is simple and can be manufactured relatively easily.
[0043]
Therefore, according to the temperature sensor 100, the first electrode 2a and the first core wire 4, the second electrode 2b and the second core wire 5 can be reliably insulated from each other, and the manufacturing cost can be reduced.
[0044]
(Embodiment 2)
The temperature sensor of the second embodiment uses an insulating holder 26 shown in FIG. The insulating holder 26 is made of insulating ceramics that is a single member having an outer shape that is substantially cylindrical, and has a substantially H-shaped cross section orthogonal to the axial direction. The first insertion port 26a and the second insertion port 26b that open in the opposite direction on the peripheral surface are recessed in parallel to the axial direction, and a partition portion 26d is formed between the first insertion port 26a and the second insertion port 26b. Has been. The width t4 of the partition portion 26d is 0.1 mm or more in consideration of mechanical strength.
[0045]
Also in the temperature sensor of the second embodiment, the first electrode 2a and the one end side 4a of the first core wire 4 and the one end of the second electrode 2b and the second core wire 5 are in the first insertion port 26a and the second insertion port 26b. After inserting the side 5a, both are overlapped and laser welding is performed on both overlapping portions to connect the electrodes and the core wire.
[0046]
The inner diameter t3 of the first insertion port 26a and the second insertion port 26b of the insulating holder 26 whose cross-sectional shape is substantially H-shaped is the outer diameter of the first electrode 2a (second electrode 2b) and the first core wire. 4 (second core wire 5) is formed to have a size substantially equal to the total outer diameter. In the second embodiment, although not illustrated, the overlapping portion is exposed to the first insertion port so that the overlapping portion of the first electrode 2a and the first core wire 4 is exposed to the opening side of the first insertion port 26a. 26a. The same applies to the insertion of the second electrode 2b and the second core wire 5 into the second insertion port 26b. Thus, by arranging the first electrode 2a and the first core wire 4, the second electrode 2b and the second core wire 5 in the first and second insertion ports 26a and 26b, the overlapping portion (joint surface) of the electrode and the core wire. Can be maintained in good contact with each other, and laser welding of both can be performed satisfactorily without performing a pressing work for pressing the overlapping portion of the electrode and the core wire. Further, in the insulating holder 26 of the second embodiment, the width becomes narrower toward the outer side toward the side where the first and second electrodes 2a and 2b and the first and second core wires 4 and 5 are inserted in the partition portion 26d. A chamfered portion (R surface which is a chamfered portion in the second embodiment) 26c is formed. Accordingly, the first and second electrodes 2a and 2b and the first and second core wires 4 and 5 can be smoothly inserted into the first and second insertion ports 26a and 26b.
[0047]
In this temperature sensor, the insulation between the first electrode 2 a, the first core wire 4, the second electrode 2 b, and the second core wire 5 is particularly improved by the insulating holder 26.
[0048]
(Embodiment 3)
The temperature sensor of the third embodiment uses an insulating holder 36 shown in FIG. The insulating holder 36 is also made of insulating ceramics, which is a single member having a substantially cylindrical shape, and has a substantially S-shaped cross section perpendicular to the axial direction. The first insertion port 36a and the second insertion port 36b that open in the opposite direction to the peripheral surface are recessed in parallel to the axial direction, and a partition 32d is formed between the first insertion port 36a and the second insertion port 36b. Has been. The width t6 of the partition part 36d is 0.1 mm or more in consideration of mechanical strength and the like.
[0049]
Also in this temperature sensor, the insulation between the first electrode 2a, the first core wire 4, the second electrode 2b, and the second core wire 5 is particularly improved by the insulating holder 36.
[0050]
The present invention is not limited to the specific embodiments described above, and various modifications can be made within the scope of the present invention depending on the purpose and application. For example, the insulating holders 6, 26, and 36 may be formed of a single member, and the shape is not limited to a substantially cylindrical shape.
[0051]
Furthermore, the joining of the overlapping portion between the first electrode 2a and the one end side 4a of the first core wire 4 and the joining of the overlapping portion between the second electrode 2b and the one end side 5a of the second core wire 5 are as in the first to third embodiments. However, it is not limited to laser welding, and may be performed by argon welding, brazing welding, or the like. Further, the shape of the metal cover 1 may be a substantially straight cylindrical shape instead of the stepped shape as in the first embodiment.
[Brief description of the drawings]
FIG. 1 is a partially broken cross-sectional view of a temperature sensor according to a temperature sensor, a manufacturing method thereof, and a temperature sensor insulating holder according to a first embodiment.
FIG. 2 is a partially enlarged cross-sectional view of the temperature sensor according to the temperature sensor, the manufacturing method thereof, and the temperature sensor insulating holder according to the first embodiment.
FIG. 3 is a perspective view of an insulating holder according to the temperature sensor, the manufacturing method thereof, and the insulating holder for the temperature sensor according to the first embodiment.
4 is a perspective view of an insulating holder according to a temperature sensor, a manufacturing method thereof, and an insulating holder for a temperature sensor according to Embodiment 2. FIG.
FIG. 5 is a perspective view of an insulating holder according to a temperature sensor, a manufacturing method thereof, and an insulating holder for a temperature sensor according to a third embodiment.
[Explanation of symbols]
1 ... Metal cover
2 ... Temperature sensing element (thermistor)
2a ... 1st electrode
2b ... second electrode
3 ... Seaspin
4 ... 1st core wire
5 ... Second core wire
6, 26, 36 ... Insulation holder
6a, 26a, 36a ... 1st insertion slot
6b, 26b, 36b ... 2nd insertion slot
6d, 26d, 36d ... partitioning part

Claims (8)

A bottomed cylindrical metal cover with a closed tip, a temperature sensing element capable of detecting the temperature and outputting it as an electrical signal to the first electrode and the second electrode, and the first and second core wires in an insulated state inside A first step of preparing at least a seaspin provided with:
A single insulating holder having a partition part that separates both sides in an insulated state, a first insertion port that opens on one side of the partition part, and a second insertion port that opens on the other side of the partition part , The inner diameter of the first insertion port is formed substantially equal to the sum of the outer diameter of the first electrode and the outer diameter of the first core wire, and the inner diameter of the second insertion port is equal to the outer diameter of the second electrode. A second step of preparing an insulating holder formed substantially equal to the total outer diameter of the second core wire ;
The first electrode and the first core wire are placed in the first insertion port of the insulating holder so that the overlapping portion of the first electrode and the first core wire is exposed to the opening side of the first insertion port . while that overlay inserted, to the second insertion mouth, as the overlapping portion between the second electrode and the second wire is exposed to the opening side of the second insertion opening, said second electrode and said A third step of inserting and superposing two core wires;
Joining the overlapping portion between the first electrode and the first core positioned in the first insertion mouth of the insulating holder, the the second electrode and the second core is located in the second insertion mouth A fourth step of joining the overlapping portions;
A temperature sensor manufacturing method comprising: a fifth step of housing the temperature sensitive element in the metal cover together with the insulating holder and fixing the metal cover and the sheath pin. A bottomed cylindrical metal cover with a closed tip, a temperature sensing element capable of detecting the temperature and outputting it as an electrical signal to the first electrode and the second electrode, and the first and second core wires in an insulated state inside A first step of preparing at least a seaspin provided with:
Preparing a single insulating holder having a partition part that separates both sides in an insulated state, a first insertion port that opens on one side of the partition part, and a second insertion port that opens on the other side of the partition part; Process,
In the first insertion port of the insulating holder, the first electrode and the first core wire are arranged so that the smaller outer diameter of the first electrode or the first core wire is located on the opening side of the first insertion port . while that overlay by inserting, in the second insertion mouth, as the smaller outer diameter of the second electrode or the second core is located on the opening side of the second insertion opening, and the second electrode A third step of inserting and overlapping the second core wire;
The overlapping portion between the first electrode located in the first insertion port of the insulating holder and the first core wire is joined, and the overlapping portion between the second electrode located in the second insertion port and the second core wire A fourth step of bonding
A temperature sensor manufacturing method comprising: a fifth step of housing the temperature sensitive element in the metal cover together with the insulating holder and fixing the metal cover and the sheath pin. When the maximum outer diameter of the insulating holder is d and the inner diameter of the metal cover corresponding to the position of the maximum outer diameter of the insulating holder is D, the relationship of D−d ≦ 0.2 mm is satisfied. The manufacturing method of the temperature sensor of Claim 1 or 2 . The insulating holder, the manufacturing method of the temperature sensor of any one of claims 1 to 3 first insertion opening and the second insertion opening, characterized in that the open towards the same direction. The method of manufacturing a temperature sensor according to claim 4 , wherein the insulating holder has a substantially E-shaped cross section perpendicular to the axial direction. The temperature sensor manufacturing method according to any one of claims 1 to 3 , wherein the insulating holder has the first insertion port and the second insertion port opened in opposite directions. The method for manufacturing a temperature sensor according to claim 6 , wherein the insulating holder has a substantially H-shaped cross-section perpendicular to the axial direction. The method for manufacturing a temperature sensor according to claim 6 , wherein the insulating holder has a substantially S-shaped cross section perpendicular to the axial direction.

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