JP4891883B2 - Fixing structure and fixing unit of sensor element having lead - Google Patents

Description

  The present invention relates to a fixing structure and a fixing unit for fixing a measuring element having a sensor element and a lead extending from the element to a measured object, and more particularly to a fixing structure and a fixing unit suitable for fixing a thermistor to a reactor.

  For example, a reactor generally includes a coil that is a winding and a magnetic core, and an inductance is obtained by winding the coil around the core. Conventionally, a reactor is used in a booster circuit, an inverter circuit, an active filter circuit, and the like. As such a reactor, a core and a coil wound around the core are placed in a case such as a metal together with other insulating members. In many cases, a structure that is housed in a container is used (see, for example, Patent Document 1).

  For example, in a reactor used in an on-vehicle booster circuit, in order to obtain a high inductance value in a high current region, two single coil elements formed with a predetermined winding diameter and the number of turns are formed in parallel, and both coil elements A coil is used that is connected (connected) so that the directions of the currents flowing through are opposite to each other. In such a reactor, if a high current continues to flow, the coil overheats and the electrical characteristics deteriorate, and therefore, the internal temperature is measured by a thermistor so that the coil does not generate heat above a certain temperature.

JP 2003-1224039 A

  In order to stably manufacture a reactor having a thermistor capable of high-precision temperature measurement, it is necessary to position the temperature measurement region including the thermistor element at the tip at the same location every time. However, since it is almost impossible to directly fix the temperature measurement part, it is difficult to position the temperature measurement part at the same place every time because the parts other than the temperature measurement part are fixed with screws. Further, it is necessary to provide a screw locking structure at a site other than the temperature measuring site, which leads to a significant increase in the cost of the thermistor.

  An object of the present invention is to provide a technique capable of positioning and fixing a measurement site of a measurement body having a sensor element having a simple configuration and a lead extending from the element to the measurement object with high accuracy.

  In order to stably manufacture a measurement object having a sensor element capable of measuring with high accuracy and a measurement object having a lead extending from the element, the inventor provides a measurement site including a sensor element with a simple configuration. The present inventors have found a measuring structure fixing structure and a fixing unit having a novel configuration that can be positioned and fixed at the same location of the measured object every time.

That is, in order to achieve the above-described object, the present invention provides a fixing structure for fixing a measurement body having a sensor element and a lead extending from the element to the body to be measured, and the measurement body connects the lead from the sensor element. A portion including a predetermined length is covered with a coating material harder than the hardness of the lead, and the covering portion is folded back toward the remaining portion of the lead extending from the portion, and the covering portion and the remaining portion of the lead A measurement site constituted by a portion having substantially the same length as the covering portion, and the object to be measured includes an insertion port through which the measurement site is inserted from the folded end portion side, and the insertion port. a storage unit for storing the inserted said measurement site, and wherein said to have a front end of the covering portion and a contact portion for retaining by abutment when the leads are pulled.

  According to this configuration, since the measurement site can be formed by covering and folding, the measurement body has a simple configuration. In addition, the covering part of the measurement site once stored in the storage part comes into contact with the contact part when the lead is pulled and is made of a material harder than the hardness of the lead, so it is difficult to deform. Can be prevented. And since the sensor element of the measurement site | part accommodated in the accommodating part is always positioned in the same location of a to-be-measured body, a highly accurate measurement is attained.

In addition, since the contact portion is formed in the insertion port, it is possible to simultaneously design an insertion port through which the measurement site can be easily inserted and a contact portion that can reliably contact the covering portion.
Further, since the insertion port and the opening of the storage portion are formed so as to be substantially the same as the dimensions of the entire measurement site in the direction orthogonal to the length direction of the predetermined length of the covering portion, The measurement site once stored in the storage unit is firmly held.
In addition, since the depth of the storage portion is formed so as to be substantially the same as the length dimension of the covering portion of the predetermined length of the measurement site, the measurement site once stored in the storage portion is surely attached to the contact portion. It comes into contact and is prevented from coming off.

In addition, since the length dimension of the covering portion of the predetermined length of the measurement site is formed to be larger than the overall dimension of the measurement site in a direction orthogonal to the length direction of the coating portion of the predetermined length , the lead Even when the is pulled, the measurement site does not rotate in the storage portion, and the measurement site can be prevented from coming out.
In addition, since the lead is formed of an elastic material, the opening of the storage portion is larger than the dimension of the entire measurement site in the direction orthogonal to the length direction of the predetermined length of the covering portion . It is possible to prevent the covering portion from being opened and reliably contacting the contact portion, and the measurement site from coming out.

In order to achieve the above object, a fixing unit for fixing a sensor element of the present invention and a measurement body having a lead extending from the element to a measurement object is provided such that a predetermined length portion including the lead from the sensor element is formed on the lead. It is covered with a coating material harder than the hardness, and the covered portion is folded back toward the remaining portion of the lead extending from the portion, and the covering portion and the remaining length of the lead are substantially the same as the covered portion. A measurement site constituted by the portion, an insertion port through which the measurement site is inserted from the folded end side, a storage unit for storing the measurement site inserted from the insertion port, and the lead being pulled. wherein for retaining by the tip of the covering part and abuts and a contact portion, said measurement site is received in the receiving portion is inserted through a previously the insertion opening when the And features. With this configuration, since it can be packaged as a fixed unit provided with a measurement body, it can be widely used for various measurement objects.

  According to the present invention, since the measurement site can be formed by covering and folding, the measurement body has a simple configuration, and the cost increase can be minimized. In addition, the covering part of the measurement site once stored in the storage part comes into contact with the contact part when the lead is pulled and is made of a material harder than the hardness of the lead, so it is difficult to deform. Can be prevented, and rough handling can be handled. And since the sensor element of the measurement site stored in the storage part is always positioned at the same location of the measured object, high-precision measurement is possible, and the measured object equipped with such a measured object can be manufactured stably. can do.

  A sensor element fixing structure and a fixing unit having leads according to an embodiment of the present invention will be described in detail with reference to the drawings. In the present embodiment, the present invention is applied to the case where the thermistor (measurement body) is fixed to the reactor (measurement body).

FIG. 1 is a perspective view of a reactor to which a thermistor to which an embodiment of the present invention is applied is fixed, and FIG. 2 is a cross-sectional view of the reactor partition plate shown in FIG.
The reactor 10 is used, for example, in an electric circuit of a device having a forced cooling means. The reactor 10 and the bobbin 15a, 15b, the reactor core 17, the thermistor 20, and a heat resistor (not shown) are integrated with the coil partition plates 13a and 13b. It includes a conductive case and an insulating / heat dissipating sheet. The reactor coil 11 has a configuration in which two single coil elements are formed in parallel. As shown in FIG. 4, the bobbins 15a and 15b include flange portions 15aa and 15ba and two boss portions 15ab and 15bb integrated with the flange portions 15aa and 15ba, and the boss portions 15ab and 15bb are arranged to face each other. It becomes the composition which is done. The coil partition plates 13a and 13b are disposed between the two boss portions 15ab and 15bb of the bobbins 15a and 15b, and are integrated with the flange portions 15aa and 15ba. The reactor core 17 is formed so as to be substantially oval when viewed from above, and is configured to be inserted into the reactor coil 11.

  In the reactor 10, two boss portions 15ab and 15bb of bobbins 15a and 15b are inserted into the reactor coil 11, coil partition plates 13a and 13b are inserted between the reactor coils 11, and both ends of the reactor coil 11 are connected to the bobbin. It is clamped by two flange portions 15aa and 15ba of 15a and 15b. Then, the reactor core 17 is inserted into the two boss portions 15ab and 15bb of the bobbins 15a and 15b, and the thermistor 20 is fixed to the coil partition plates 13a and 13b. And these are accommodated in the heat conductive case via the insulating and heat radiating sheet, and the filling material is poured and fixed. The thermistor 20 and the coil partition plates 13a and 13b are formed with the constituent parts of the characteristic fixing structure of the present invention, and will be described in detail below with reference to the drawings.

3 is a diagram of the thermistor alone shown in FIG. 1, FIG. 4 is a perspective view of only the bobbin and the coil partition plate shown in FIG. 1, and FIG. 5 is a sectional view of the partition plate of FIG.
As shown in FIG. 3, the thermistor 20 has a thermistor element 21 and a lead 22 extending from the element 21. Further, a portion including a lead 22 a having a predetermined length indicated by a dotted line from the thermistor element 21 is covered with a resin tube 23. The portions of the thermistor element 21 and the leads 22a covered with the resin tube 23 are folded back at an angle of 180 ° toward the lead 22 extending from the tube 23, that is, a hairpin-shaped folded end 24a is formed. Thus, a measurement site 24 surrounded by a dashed line in the figure is formed. Since the folded end portion 24a of the measurement site 24 is formed in a hairpin shape without an edge portion, it is difficult to break, easy to be guided into the insertion port 31, and easy to insert into the storage portion 32. The measurement site 24 is a constituent part of the fixed structure.

  As shown in FIGS. 4 and 5, the coil partition plates 13 a and 13 b are provided with an insertion port 31, a storage portion 32, and a contact portion 33. The measurement site 24 is inserted into the insertion port 31 from the folded end 24a side. The measurement part 24 inserted from the insertion port 31 is stored in the storage part 32. The contact portion 33 prevents the measurement site 24 from coming off by contacting the tip of the resin tube 23 when the lead 22 is pulled. The insertion port 31, the storage part 32, and the contact part 33 are one component part of a fixed structure.

  As shown in FIG. 5, the insertion port 31 is formed at the upper left end of the coil partition plate 13a. That is, the upper left end portion of the coil partition plate 13 a shown in the figure is cut out in a triangular shape, and the cutout portion forms the insertion port 31. The storage portion 32 is formed between the illustrated left side and lower left end of the coil partition plate 13a and the illustrated right side of the coil partition plate 13b. That is, the left side portion of the coil partition plate 13a connected to the triangular cutout portion is cut out in a rectangular shape, and the portion surrounded by the right side portion of the coil partition plate 13b is shown in FIG. 32 is formed. The contact portion 33 is formed at the upper right end portion of the coil partition plate 13b in the figure. That is, the upper right end portion of the coil partition plate 13b is protruded in a claw shape extending in the right direction of the drawing, and this protruding portion forms the contact portion 33.

  As shown in FIG. 5, the insertion port 31 and the contact portion 33 are formed at the upper left end of the coil partition plate 13a and the upper right end of the coil partition plate 13b. For this reason, by adjusting the front opening a of the insertion port 31 (the distance a between the tip of the contact portion 33 and the upper left end of the coil partition plate 13a in the figure) and the protruding length b of the contact portion 33, the measurement site is measured. It is possible to simultaneously design the insertion port 31 into which the 24 can be easily inserted and the contact portion 33 that can reliably contact the tip of the resin tube 23.

Further, the opening a of the insertion port 31 and the opening c of the storage portion 32 (the distance c between the left side of the coil partition plate 13a and the right side of the coil partition plate 13b) are the dimensions of the measurement site 24 in the direction perpendicular to the axis. That is, it is formed so as to be substantially the same as the dimension d (see FIG. 3) of the entire measurement site 24 in the direction orthogonal to the length direction of the covering portions 21 and 22a having a predetermined length . Accordingly, the measurement site 24 once stored in the storage portion 32 through the insertion port 31 is firmly sandwiched between the illustrated left side of the coil partition plate 13a and the illustrated right side of the coil partition plate 13b in the direction perpendicular to the axis. Retained.

The depth e of the storage portion 32 (the distance e between the lower end of the contact portion 33 and the lower left end of the coil partition plate 13a in the drawing) is the axial dimension of the measurement site 24, that is, a predetermined length of the measurement site 24. It is formed so as to be substantially the same as the length dimension f (see FIG. 3) of the covering portions 21 and 22a . As a result, the measurement site 24 once stored in the storage portion 32 is restricted from moving in the axial direction by the abutting portion 33 and the lower left end portion of the coil partition plate 13a in the figure, and the tip of the resin tube 23 is brought into contact with the abutting portion 33 It is securely abutted and prevented from coming off.

Here, the dimension of the measurement site 24 in the axial direction, that is, the length dimension f of the covering portions 21 and 22a of the predetermined length of the measurement site 24 is the dimension of the measurement site 24 in the direction perpendicular to the axis , that is, the predetermined length of coating. It is formed to be larger than the dimension d of the entire measurement site 24 in the direction orthogonal to the length direction of the portions 21 and 22a . If the dimension f of the measurement site 24 is smaller than the dimension d of the measurement site 24 when the lead 22 is pulled, the measurement site 24 is stored in the storage portion 32 with the tip of the resin tube 23 in contact with the contact portion 33 as a fulcrum. May rotate counterclockwise in the figure and come out of the storage portion 32. By forming the dimension f of the measurement site 24 to be larger than the dimension d of the measurement site 24, when the lead 22 is pulled, the measurement site 24 is arranged on the left side of the coil partition plate 13a and the coil partition plate 13b. Since it abuts on the right side storage portion in the figure, it does not rotate, and the measurement site 24 can be prevented from coming out of the storage portion 32.

  Furthermore, if the resin tube 23 is made of a soft material, the lead 22 may be bent and pulled out of the storage portion 32 when the lead 22 is pulled. Therefore, the resin tube 23 needs to be formed of a material harder than at least the lead 22. Further, the resin tube 23 needs to protect the thermistor element 21 from insulation. Further, the resin tube 23 needs to be made of a slippery material so that it can be easily inserted into the storage portion 32 from the insertion port 31. From the above viewpoint, the resin tube 23 is preferably made of, for example, a fluororesin.

  In the embodiment described above, the opening c of the storage portion 32 is formed to be substantially the same as the dimension d of the measurement site 24 in the direction perpendicular to the axis, but larger than the dimension d of the measurement site 24 in the direction perpendicular to the axis. You may form so that it may become. In this case, the lead 22 needs to be formed of a material having elasticity. As a result, even when the opening c of the storage portion 32 is larger than the dimension d of the measurement site 24 in the direction perpendicular to the axis, the resin tube 23 is opened until it contacts the right side of the coil partition plate 13b. The tip of 23 can be surely brought into contact with the contact portion 33, and the measurement site 24 can be prevented from coming out of the storage portion 32.

FIGS. 6A, 6B, and 6C are views showing an operation procedure for fixing the thermistor to the coil partition plate.
First, as shown in FIG. 6A, the portions of the thermistor element 21 and the lead 22a covered with the resin tube 23 are folded back to the side of the lead 22 extending from the tube 23 into an angle of 180 °, that is, a hairpin shape. A measurement site 24 is formed. And the folding | turning edge part 24a of this measurement site | part 24 is orient | assigned to the insertion port 31 currently formed in the coil partition plates 13a and 13b.

  Subsequently, as shown in FIG. 6B, the measurement site 24 is inserted into the insertion port 31 from the folded end 24 a side. At this time, the upper left portion of the coil partition plate 13a connected from the insertion port 31 to the storage portion 32 is formed as an inclined surface, and the measurement site 24 is guided by the inclined surface. It can be slid smoothly inside.

  Finally, as shown in FIG. 6C, the measurement site 24 is stored in the storage portion 32 by being pushed in until the tip of the resin tube 23 clears the contact portion 33. As a result, the tip of the resin tube 23 is caught by the contact portion 33, so that the position of the thermistor element 21 is fixed. Even if the lead 22 is pulled, the tip of the resin tube 23 is in contact with the contact portion 33, so that the measurement site 24 can be prevented from coming off. As described above, according to the fixing structure of the present embodiment, the application process and the curing process of the fixing agent for preventing removal of the thermistor from the reactor, which has been necessary in the past, are unnecessary, and thus the reactor 10 to which the thermistor 20 is fixed. The manufacturing process can be greatly simplified, and variations in work can be reduced.

FIG. 7 is a view showing a cross section of another type of partition plate corresponding to FIG.
The coil partition plates 14a and 14b are provided with an insertion port 41, a storage portion 42, and a contact portion 43. The measurement site 24 is inserted into the insertion port 41 from the folded end portion 24a side. The measurement part 24 inserted from the insertion port 41 is stored in the storage part 42. The contact portion 43 prevents the measurement site 24 from coming off by contacting the tip of the resin tube 23 when the lead 22 is pulled. The insertion port 41, the storage part 42, and the contact part 43 are one component part of a fixed structure.

  The formation structure is the same as that of the fixing structure shown in FIG. 5, but is different in that the storage portion 42 and the contact portion 43 are formed to be inclined. The insertion port 41 is formed at the upper left end of the coil partition plate 14a. That is, the upper left end portion of the coil partition plate 14a shown in the figure is cut out in a triangular shape, and the cutout portion forms the insertion port 41. The storage part 42 is formed between the illustrated left side of the coil partition plate 14a and the illustrated right side of the coil partition plate 14b. That is, the left side portion of the coil partition plate 14a connected to the triangular cutout portion is cut out in a triangular shape, and the right side portion of the coil partition plate 14b is cut out in a triangular shape. A portion surrounded by the notch portion forms a storage portion 42. The contact portion 43 is formed to be inclined at the upper right end portion of the coil partition plate 14b in the figure. That is, the upper right end portion of the coil partition plate 14 b is projected in a claw shape extending obliquely downward to the right in the drawing, and this projecting portion forms the contact portion 43.

  Thus, by forming the storage part 42 and the contact part 43 in an inclined manner, it is possible to always form the same dimensions even in a small reactor, that is, a reactor having a low height. For this reason, the same measurement site | part 24 can be used from a large reactor to a small reactor.

FIG. 8 is a diagram showing another type of fixing structure.
This fixing structure is a fixing unit 50 in which the thermistor 20 is fixed in advance to a fixing plate 60 having a structure similar to that of the coil partition plates 13a and 13b and packaged.

  The fixing plate 60 is formed with an insertion port 61, a storage portion 62, and a contact portion 63 that have the same formation size and shape as the fixing structure shown in FIG. That is, the measurement site 24 of the thermistor 20 is inserted into the insertion port 61 from the folded end 24a side. The measurement part 24 inserted from the insertion port 61 is stored in the storage part 62. The contact portion 63 prevents the measurement site 24 from coming off by contacting the tip of the resin tube 23 when the lead 22 is pulled. However, a portion corresponding to the lower left end portion of the coil partition plate 13 a shown in FIG. 5 is integrally formed to constitute the storage portion 62. A transparent, translucent or opaque resin film 64 is attached to both surfaces of the fixed plate 60 in which the measurement site 24 is accommodated to prevent the measurement site 24 from coming off.

  According to the fixing unit 50 in which the thermistor 20 is fixed and packaged in advance on such a fixing plate 60, it can be applied even to a reactor in which a fixing structure is not formed on the coil partition plates 13a and 13b. Without being limited, it can be widely used for various objects to be measured. Note that the fixing structure shown in FIG. 7 may be a packaged fixing unit, which can be used for a small object to be measured.

  As described above, according to the fixing structure 24, 31, 32, 33, 41, 42, 43 and the fixing unit 50 of the thermistor 20 of the present embodiment, the measurement site 24 can be formed by covering and folding the resin tube 23. The thermistor 20 can have a simple configuration. Further, the resin tube 23 of the measurement site 24 once stored in the storage portions 32, 42, 62 contacts the contact portions 33, 43, 63 when the lead 22 is pulled, and is further harder than the hardness of the lead 22. Since it is made of a material and is not easily deformed, it can be prevented from slipping out of the storage portions 32, 42, 62. And since the thermistor element 21 of the measurement site | part 24 accommodated in the accommodating parts 32,42,62 is always positioned in the same location of the reactor 10, a highly accurate measurement is attained.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the claims.

  Although the present invention has been described with respect to a structure in which a thermistor is fixed to a reactor as a measurement object as a measurement object, the invention is not limited to this. For example, a magnetic element or the like may be used as a measurement object, a transformer or the like as a measurement object. It can be widely applied to other electronic components.

It is a perspective view of a reactor to which a thermistor to which an embodiment of the present invention is applied is fixed. It is sectional drawing in the partition plate of the reactor shown in FIG. It is a figure of the thermistor single-piece | unit shown in FIG. FIG. 2 is a perspective view of only the bobbin and the coil partition plate shown in FIG. 1. It is sectional drawing in the partition plate of FIG. (A), (B), (C) is a figure which shows the operation | work procedure which fixes a thermistor to a coil partition plate. It is a figure which shows the cross section in the partition plate of another form corresponding to FIG. It is a figure which shows the fixation structure of another form.

Explanation of symbols

10 reactors, 11 reactor coils,
13, 13a, 13b, 14a, 14b coil partition plate, 15 bobbin,
17 reactors, 20 thermistors, 21 thermistors,
22, 22a lead, 23 resin tube, 24 measurement site,
24a Folding end portion 31, 41, 61 insertion port, 32, 42, 62 storage portion,
33, 43, 63 abutting part, 50 fixing unit, 60 fixing plate,
64 Resin film

Claims (7)

A fixing structure for fixing a measuring body having a sensor element and a lead extending from the element to a measured body, wherein the measuring body has a predetermined length portion including the lead from the sensor element, and the hardness of the lead Covered with a hard covering material, the covering portion is folded back to the remaining portion of the lead extending from the portion, and the covering portion and a portion of the remaining portion of the lead having a length substantially the same as the covering portion; The measurement object is constituted by an insertion port into which the measurement site is inserted from the folded end side, and a storage unit for storing the measurement site inserted from the insertion port, A sensor element fixing structure having a lead, comprising: a contact portion that prevents the lead from coming off by contacting the tip of the covering portion when the lead is pulled. The sensor element fixing structure according to claim 1, wherein the contact portion is formed in the insertion port. 3. The insertion port and the opening of the storage portion are formed substantially the same as the overall dimension of the measurement site in a direction perpendicular to the length direction of the predetermined length of the covering portion. A fixing structure of a sensor element having the lead described in 1. The lead according to any one of claims 1 to 3, wherein a depth of the storage portion is formed substantially the same as a length dimension of the predetermined length of the covering portion of the measurement site. Sensor element fixing structure. The length dimension of the predetermined-length covering portion of the measurement site is formed to be larger than the overall dimension of the measurement site in a direction orthogonal to the length direction of the predetermined-length coating portion. A fixing structure for a sensor element having a lead according to any one of claims 1 to 4. The sensor element fixing structure according to any one of claims 1 to 5, wherein the lead is formed of an elastic material. A fixing unit for fixing a measurement element having a sensor element and a lead extending from the element to a measured object, wherein the fixed unit includes a portion having a predetermined length including the lead from the sensor element than the hardness of the lead. Covered with a hard covering material, the covering portion is folded back to the remaining portion of the lead extending from the portion, and the covering portion and a portion of the remaining portion of the lead having a length substantially the same as the covering portion; When the lead is pulled, a measurement site configured by: an insertion port through which the measurement site is inserted from the folded end side; a storage unit that stores the measurement site inserted from the insertion port; A contact portion that prevents the cover portion from coming off by contacting the tip of the covering portion, and the measurement site is previously inserted from the insertion port and stored in the storage portion. Fixed unit to be.

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