WO2005001404A1 - 温度センサ - Google Patents
温度センサ Download PDFInfo
- Publication number
- WO2005001404A1 WO2005001404A1 PCT/JP2004/008752 JP2004008752W WO2005001404A1 WO 2005001404 A1 WO2005001404 A1 WO 2005001404A1 JP 2004008752 W JP2004008752 W JP 2004008752W WO 2005001404 A1 WO2005001404 A1 WO 2005001404A1
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- WO
- WIPO (PCT)
- Prior art keywords
- holder
- temperature sensor
- resin
- temperature
- sensor according
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
Definitions
- the present invention relates to a temperature sensor that detects an oil temperature such as an ATF (Automatic Transmission Fluid) of an automobile.
- ATF Automatic Transmission Fluid
- FIG. 15 is a schematic sectional view showing a prototype (unknown) of the temperature sensor.
- a temperature detecting element 56 to which a pair of lead wires 54A and 54B is connected is disposed at the bottom of a bottomed cylindrical holder 52 made of metal.
- the resin 52 is filled in the holder 52.
- the resin 58 filled in the holder 52 forms a cylindrical side wall 62 on the opening 60 side of the holder 52.
- a hole 64 through which a lead wire penetrates is formed in a side wall 62 made of this resin, and the lead wires 54A and 54B drawn out of the resin 58 are bent and drawn out through the hole 64. .
- a lead wire lead-out member 66 mounted so that a part thereof is supported by the side wall 62 is mounted.
- the lead wire lead-out member 66 is a cylindrical elastic body, and suppresses excessive bending of the lead wires 54A and 54B near the hole 64.
- the lead wire 54A, 54B is drawn out to the outside by such a lead wire drawing member 66, and the vicinity of the hole 64, where the lead wires 54A, 54B are greatly bent, is used. This prevents the lead wires 54A and 54B from being bent and bent by nearly 90 degrees.
- a waterproof cap 70 is covered so as to cover the resin 68 and the side wall 62.
- the waterproof cap 70 covers the upper part of the temperature sensor exposed to the environment receiving water droplets and water vapor, thereby preventing the water droplets and the like from entering the sensor 50 from the boundary of each member and reaching the temperature detecting element 56. It is planned.
- Reference numeral 72 denotes a metal stay that is insert-molded in the resin 58 and supports the lead wire from below to suppress the movement thereof
- reference numeral 74 denotes the metal stay 72 that damages the lead wires 54A and 54B. It is a protection tube for preventing a situation.
- Patent Document 1 Japanese Patent Application Laid-Open No. H11-23379
- Patent Document 2 Japanese Utility Model Application No. 5-3955
- Patent Document 3 Japanese Patent Application Laid-Open No. 2002-267540
- Patent Document 4 Japanese Utility Model Application Laid-Open No. 6-62336
- Patent Document 5 JP-A-8-128901
- the above-described temperature sensor in the prototype stage has the following problems. That is, since the constituent materials of the lead wire lead-out member 66 and the waterproof cap 70 are different, the temperature sensor 50 is configured as a separate member. This has hindered the reduction in the number of parts and, accordingly, the simplification of the manufacturing process.
- the present invention has been made to solve the above-described problems, and has as its object to provide a temperature sensor in which the number of parts is reduced.
- the temperature sensor according to the present invention is connected to a bottomed cylindrical holder having an opening so that a pair of lead wires is introduced from the opening side, and the temperature stored in the bottom of the holder.
- a sensor cover having a neck portion extending outwardly of the cap portion along the outer peripheral surface of the lead wire pair is provided.
- the entire opening of the holder is covered by the cap portion of the sensor cover, and the situation where water droplets or the like enter between the holder and the filling resin portion is prevented.
- the break of the lead wire due to excessive bending is suppressed by the neck portion of the sensor cover.
- Such a cap portion and a neck portion are both part of the sensor cover and are integrated.
- the number of parts is reduced as compared with a temperature sensor in a prototype stage in which a cap and a lead wire lead-out member are separate bodies.
- the apparatus further includes a guide portion projecting from an edge of the opening of the holder and guiding each of the lead wires constituting the lead wire pair, and the sensor cover preferably covers the guide portion. Les , since the sensor cover restricts the movement of the lead wire pair around the guide, the guide can more reliably guide the lead.
- the shape of the guide portion is a ⁇ -shape having a portion extending in a direction perpendicular to the extending direction of the holder and a portion extending in parallel to the extending direction of the holder. It is preferable. In this case, the portion extending in the direction perpendicular to the extending direction of the holder prevents the sensor cover from falling off.
- a substantially annular return portion that protrudes outward from the holder is formed at an edge of the opening of the holder, and at least a part of the sensor cover is locked by the return portion. Is preferred. In this case, dropping of the sensor cover from the holder can be suppressed.
- the sensor cover is preferably formed by hot melt molding. In this case, it is possible to reliably form the sensor cover by hot melt molding, which is a molding method suitable for practical use.
- a sensing unit which is immersed in the fluid in the case to be measured for temperature is provided, and the sensing unit accommodates a temperature detecting element to which a pair of lead wires is connected. It is preferable that the element is covered only with the element protection part made of resin.
- a temperature detecting element to which a pair of lead wires is connected is housed in a sensing unit. The temperature detecting element is covered only by the element protection part made of resin. Ie However, this temperature sensor does not use a conductive holder, and the temperature detection element and the lead wire pair do not come into contact with the conductor, so that the temperature detection signal of the sensor is stabilized.
- this temperature sensor unlike the conventional temperature sensor in which the temperature detecting element is housed in a metal holder, when the temperature detecting element is housed in the holder, the temperature detecting element, the lead wire pair, and the conductor are connected. Since there is no need to consider the insulation of the sensor, the fabrication of the sensor is simplified, and the efficiency of the fabrication is improved. In addition, since a metal holder, which is difficult to mold, is not used, the fabrication of the sensor is facilitated, and the cost of fabricating components is reduced.
- the element protection portion has a laminated structure made of different or the same kind of resin.
- the resin on the side immersed in the fluid and the resin on the side directly covering the temperature detecting element can be selected as necessary.
- the holder is made of a resin
- the element protection section is made up of the holder and a filled resin part filled in the holder.
- the water tightness between the holder and the filled resin portion filled in the holder is low.
- the watertightness between the holder and the filled resin portion is improved.
- the element protection section contains a polyphenylene sulfide resin as a constituent material. Since this resin has high thermal conductivity, it does not hinder the temperature detection level of the temperature detection element. In addition, since this resin has a high fluidity, even if the shape of the mold is complicated, the resin can be molded with high accuracy.
- thermosensor in which the number of parts is reduced.
- FIG. 1 is a schematic perspective view showing a temperature sensor according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the temperature sensor shown in FIG. 1, taken along the line II-II.
- FIG. 3 is a cross-sectional view of the temperature sensor shown in FIG. 1, taken along line III-III.
- FIG. 4 is a schematic perspective view showing a temperature sensor different from the temperature sensor shown in FIG. 1.
- FIG. 5 is a cross-sectional view showing a VV direction of FIG.
- FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG.
- FIG. 7 is a view showing a thermistor housed in the temperature sensor of FIG. 4.
- FIG. 8 is a perspective view showing a primary molded body of the temperature sensor of FIG.
- FIG. 9 is a sectional view taken along line IX-IX of FIG.
- FIG. 10 is a side view taken along line X—X of FIG.
- FIG. 11 is a diagram showing a state in which the temperature sensor of FIG. 4 is applied to an automatic transmission.
- FIG. 12 is a diagram showing a fixed-side mold in the mold for temperature sensor of FIG.
- FIG. 13 is a cross-sectional view showing the XIII-XIII direction in FIG.
- FIG. 14 is a view showing a process of performing secondary molding.
- FIG. 15 is a schematic sectional view showing a prototype of a temperature sensor.
- FIG. 1 is a schematic perspective view showing a temperature sensor according to an embodiment of the present invention.
- FIG. 2 is a sectional view taken along line II-II of the temperature sensor shown in FIG. Figure 3 shows the temperature sensor I shown in Figure 1.
- FIG. 3 is a sectional view taken along line II-III.
- the temperature sensor 10 is a temperature sensor which is inserted into an automatic transmission (Automatic Transmission) of an automobile and detects an ATF temperature in the transmission.
- the temperature sensor 10 has a bottomed cylindrical holder 12 made of polyphenylene sulfide (PPS) resin. Since this PPS resin has high fluidity, a highly accurate holder 12 can be obtained.
- the holder 12 has a bottom side 12a, which is a lower end side, having a small diameter.
- the bottom side 12a is immersed in an ATF in an automatic transmission housing (case) to be measured.
- the sensing unit 12a is.
- An opening 14 is formed on the upper end side 12b of the holder 12.
- the opening 14 has a circular shape, and a barbed portion 16 is formed at an edge thereof.
- the return portion 16 projects so as to extend in a direction perpendicular to the side wall of the holder 12, and is substantially annular.
- a T-shaped guide portion 18 is formed at the edge of the opening 14 in a direction parallel to the direction in which the holder 12 extends.
- the guide portion 18 is provided so as to protrude along the edge of the opening portion 14, and a harness pair 34A, 34B described later is guided between the guide portion 18 and the edge of the opening portion 14.
- a sensor fixing portion 20 is formed on the upper end side 12b of the holder 12 so as to extend in a direction perpendicular to the side wall of the holder 12.
- a through hole 22 is formed in the free end side 20a of the sensor fixing portion 20 in a direction parallel to the direction in which the holder 12 extends, and a screw 23 having a predetermined dimension is used to connect the temperature sensor 10 through the through hole 22.
- the installation object 24 (that is, the case of the automatic transmission) is fixed.
- a cylindrical metal pipe 26 is provided on the side wall of the through hole 22, and the rigidity of the through hole 22 with respect to the screw 23 is increased.
- a hermetically closed portion 12c for preventing ATF from leaking out of the installation object 24 is formed.
- the sealing portion 12c is formed along the outer periphery of the holder 12.
- An annular recess 28 is formed, and a sealing ring 30 made of an elastic resin is fitted into the recess 28.
- the installation object 24 described above has a hole 24a smaller than the outer diameter of the sealing ring 30.When the holder 12 is inserted into the hole 24a, the installation object 24 is securely secured by the sealing ring 30. Sealed.
- an NTC (Negative Temperature Coefficient) thermistor 32 for detecting an ATF temperature in a range of -40 ° C to 150 ° C is arranged.
- the PPS resin constituting the outer shell of the sensing unit 12a is preferable because it does not hinder the temperature detection level of the thermistor 32 having high thermal conductivity.
- the thermistor (temperature detecting element) 32 is made of, for example, manganese, nickel, cobalt, or the like, and is a so-called polycrystalline ceramic in which crystal grains having a so-called spinel structure are gathered.
- the thermistor 32 is sealed with glass for waterproofing, and is introduced from a pair of harness pairs (lead wire pairs) 34A and 34B, which are covered with cross-linked polyethylene, respectively. It is connected.
- the pair of conductors 35A, 35B passing through the interior of the pair of harnesses 34A, 34B and the pair of conductors 36A, 36B drawn out of the thermistor 32 are joined by crimping with bonding bands 38A, 38B, respectively.
- Reference numeral 39 shown in FIGS. 2 and 3 is a fluororesin tube (for example, Teflon (registered trademark) tube) that covers the conductor 36A, and prevents short circuit due to contact between the conductors.
- One end of the harness pair 34A, 34B is connected to the thermistor 32 as described above.
- the other end is pulled out of the temperature sensor 10 and bundled with a protective tube 40 made of cross-linked polyolefin.
- It is connected to a control processing device (not shown) that processes the temperature detection signal detected by 32.
- the control processing device that has received the temperature detection signal controls the shift timing and the like of the automatic transmission based on the signal.
- the thermistor 32 and the harness pair 34A, 34B are housed in a state where the epoxy resin is filled up to the vicinity of the opening 14 on the upper end side 12b of the holder 12, and the resin is thermally cured to fill the resin part. 42 are formed.
- the filled resin portion 42 By the filled resin portion 42, the intrusion of water into the opening portion 14 of the holder 12 and the harness pair 34A, 34B and the thermistor 32 is suppressed, and the movement of the thermistor 32 and the like is suppressed.
- the thermistor 32 is covered with the filling resin portion 42 covering the thermistor 32 and the holder 12 accommodating the filling resin portion 42, and the thermistor 32 is watertightly sealed.
- An element protection section 43 is formed. Note that the harness pair 34A, 34B is fixed so as to be parallel to the extending direction of the holder 12 when filling the resin, and stands substantially vertically near the surface 42a of the filling resin portion 42.
- the harness pair 34A, 34B extending in a substantially vertical direction from the surface 42a of the filling resin portion 42 is bent at a substantially right angle in the direction of the guide portion 18 described above.
- the harness pair 34A, 34B is divided into individual harnesses 34A, 34B by a portion 18a of the guide portion 18 extending in parallel with the extending direction of the holder 12, and is separated from the harness 34A in the extending direction of the holder 12. Is guided so as to pass between the vertically extending portion 18b and the edge of the opening 14.
- the harnesses 34A and 34B are guided by the guide portion 18, the harnesses 34A and 34B are pressed from above by the portion 18b of the guide portion 18, and the movement of the harnesses 34A and 34B is suppressed by the frictional force accompanying the pressing. At the same time, the drop off of the honoreda 12 harnesses of the harnesses 34A and 34B is prevented.
- a sensor cover (lead wire lead-out portion) 44 is formed in the opening 14 of the holder 12 so as to cover the entire opening 14.
- the sensor cover 44 is formed by hot polyester molding of polyester, and includes a cap portion 44A and a neck portion 44B (see FIG. 2).
- the cap portion 44A covers the entire portion from the edge of the opening portion 14 to the center of the surface 42a of the filling resin portion 42, and has a height enough to cover the harness pair 34A, 34B and the guide portion 18.
- Such a cap portion 44A functions as a portion for preventing a situation where water droplets or the like enter between the holder 12 and the filling resin portion 42.
- the portion outside the transmission must be entirely covered with the force cap 44A exposed to the environment that receives water droplets and water vapor. This prevents water droplets and the like from entering the temperature sensor 10.
- the sensor cover 44 covers the guide portion 18, the movement of the harnesses 34A and 34B around the guide portion 18 is restricted, and the guide portion 18 can more reliably guide the harnesses 34A and 34B.
- the position where the temperature sensor is pulled out of the harness is limited by the arrangement relationship with other parts on the layout where the automatic transmission is arranged.
- the temperature sensor 10 can be used to change the layout of the automatic transmission for each model, It is possible to more easily cope with the change of the mold.
- the resin surrounding the portion 18b of the guide portion 18 extending in the direction perpendicular to the direction in which the holder 12 extends prevents the sensor cover 144 from moving in the direction in which the holder 12 extends. The situation in which the cover 44 falls off can be more reliably prevented.
- the neck portion 44B is drawn out of the cap portion 44A in a direction perpendicular to the direction in which the holder 12 extends, and the harness pair 34A, 34B and the protective tube 40 for bundling the harness pair 34A, 34B. Extends outwardly of the cap portion 44A along the outer circumferential surface of the cap portion 44A. Since the net portion 44B is made of polyester as described above, it has elasticity. Such a neck portion 44B functions as a portion for suppressing a situation in which the harness pair 34A, 34B bends greatly in the vicinity of a portion pulled out from the temperature sensor 10, and this neck portion 44B serves as a harness due to excessive bending. Disconnection of 34A and 34B is prevented.
- the entire opening 14 can be easily and reliably resin-molded at a low temperature and a low pressure, and since the resin has fluidity during molding, Polyester can be reliably poured into the space below the turnover 16 provided at the edge of the opening 14.
- the resin portion that has flowed into the gap below the return portion 16 and solidified prevents the sensor cover 44 from dropping out of the holder 12 in cooperation with the return portion 16. That is, the sensor cover 44 is locked by the return portion 16, thereby preventing the sensor cover 44 from dropping off the holder 12.
- the cap portion 44 A which is a portion for preventing water drops or the like from entering between the force cover 12 and the filled resin portion 42 in the sensor cover 44
- a harness pair 34A, 34B has a neck portion 44B, which is a portion that suppresses a situation where the harness pair 34A, 34B is largely bent near the portion pulled out from the temperature sensor 10.
- the cap portion and the lead wire lead-out member neck portion are in a prototype stage. The number of components is reduced compared to the temperature sensor 50 (see Fig. 15).
- the metal holder 52 and the resin 58 filled therein have physical properties (for example, thermal conductivity) and mechanical properties (for example, Young's rate) differed greatly. Therefore, a sudden temperature change, internal stress, etc. A gap is easily formed between 52 and the resin 58. If the water gap between the holder 52 and the resin 58 is reduced due to the formed gap and water drops or the like may enter through the gap, the temperature detection level of the sensor may be reduced. If it occurs, in the worst case, it will be undetectable due to an electrical short circuit.
- physical properties for example, thermal conductivity
- mechanical properties for example, Young's rate
- the difference in physical characteristics and mechanical characteristics between the holder 12 and the filling resin portion 42 is very small. Therefore, compared to the temperature sensor 50 in the prototype stage, a gap is less likely to be formed between the holder 12 and the filled resin portion 42, and the watertightness between the holder 12 and the filled resin portion 42 is improved. Therefore, in the temperature sensor 10, the temperature detection level of the thermistor 32 is stable. Also, since the adhesiveness between the resins is higher than the combination of a polymer resin composed of C, H and O and a metal, the metal holder 52 is also employed from this point. It is considered that the temperature sensor 10 improves the watertightness between the holder 12 and the filled resin portion 42 as compared with the temperature sensor 50 that is used.
- the material of the metal holder used for the temperature sensor 50 and the like often contains lead in order to improve the free-cutting property.
- this lead has a problem of environmental pollution. Requires restrictions on its use.
- the production of a metal holder made of a material that does not contain lead requires sophisticated technology and expensive equipment, and thus tends to be expensive.
- the temperature sensor 10 can reduce the amount of lead used at low cost because the material of the holder 12 is a resin and does not contain lead.
- the temperature sensor 50 in the prototype stage also had the following problems. That is, Since the holder 52 made of metal such as brass is used, the holder 52 has conductivity. Therefore, when the lead wire drawn from the thermistor 56 comes into contact with the holder 52, the temperature detection signal of the sensor 50, which is a resistance value, is disturbed, and accurate temperature detection cannot be performed. Therefore, the thermistor 56 needs to be extremely carefully accommodated in the holder 52, so that the production efficiency of the sensor 50 is reduced, which causes a problem that the production time is delayed. Therefore, in the temperature sensor 10, the efficiency of the manufacturing operation was improved.
- the thermistor 32 is covered only by the element protection part 43 composed of the filling resin part 42 and the holder 12.
- the filling resin portion 42 is made of epoxy resin
- the holder 12 is made of PPS resin.
- the sensing section 12a has a configuration in which the element protection section 43 covers the thermistor 32, and does not use a conductive holder. Therefore, the thermistor 32 and the harness pair 34A, 34B do not come into contact with the conductor.
- the temperature sensor 10 is different from the temperature sensor 50 in the prototype stage in which the thermistor is housed in the metal holder, when the thermistor 32 is housed in the holder 12 and the thermistor 32 and the harness pair Since there is no need to consider the insulation between the 34A and 34B and the conductor, the production of the sensor is simplified and the production is made more efficient. That is, in the temperature sensor 10, the efficiency of the manufacturing operation is improved.
- the holder used in the temperature sensor 50 in the prototype stage is made of metal and is manufactured by cutting, it takes a great deal of labor and time to manufacture the holder.
- the holder 12 applied to the temperature sensor 10 is made of resin, and can be easily manufactured by molding. Therefore, when the holder is made of resin instead of metal, the manufacture of the sensor is facilitated. In addition, with the simplification of the holder manufacturing, the holder manufacturing cost can be reduced.
- the holder 12 since PPS resin is used as the resin material for the holder 12, the holder 12 has high thermal conductivity and does not hinder the temperature detection level of the temperature detection element.
- the PPS resin has a high fluidity, the resin molding can be performed with high precision even if the mold shape is complicated.
- FIG. 4 is a perspective view showing a temperature sensor different from the temperature sensor 10 described above.
- FIG. 5 is a sectional view taken along the line V--V in FIG. 4
- FIG. 6 is a sectional view taken along the line VI--VI in FIG. It is sectional drawing.
- the temperature sensor 101 has a built-in thermistor and detects the temperature of oil (ATF) or the like used in an automatic transmission of a vehicle.
- ATF temperature of oil
- the thermistor 110 is an NTC thermistor, and includes a temperature sensing section 111 for detecting the temperature of water, oil, or the like, and a pair of lead wires 112 and 113 connected to both sides thereof.
- the temperature sensing portion 111 is made of, for example, manganese, nickel, cobalt, or the like, and is a polycrystalline ceramic in which crystal grains having a so-called spinel structure are gathered. Further, the temperature sensing portion 111 is coated with an epoxy rubber in order to reduce a stress applied from a resin portion (described later) covering the periphery thereof.
- conductive wires 114 and 115 coated with a fluororesin for example, Teflon (registered trademark) are connected to the lead wire pairs 112 and 113 by pressing the crimp terminals 116 and 117.
- the temperature sensor 101 includes a resin part (element protection part) 120 that directly covers the thermistor 110 and an outer resin part 150 that covers the resin part 120.
- the resin part 120 is formed by first insert molding (primary molding), and the outer resin part 150 is formed by second insert molding (secondary molding).
- the operating temperature range of the thermistor 110 is, for example, ⁇ 40 ° C. to 150 ° C.
- the resin section 120 is formed of PPS resin, and has a first area (sensing section) 121 at the tip which covers the temperature sensing section 111 of the thermistor 110 and directly touches the oil or the like to be subjected to temperature measurement. Has been established.
- the cross-sectional shape of the first region 121 is a flat ellipse.
- FIG. 8 is a perspective view of the primary molded body
- FIG. 9 is a perspective view of the primary molded body.
- FIG. 10 is a sectional view taken along line IX-IX of FIG. 8 and FIG.
- a second region 122 is formed continuously from the first region 121 described above.
- the second region 122 covers a part of the pair of lead wires 112 and 113 of the thermistor 110 arranged in parallel.
- the portion of the first region 121 that is connected to the second region 122 has a peripheral edge thickness.
- a disk portion 121a that gradually becomes thinner toward the surroundings is formed. The reason why the periphery of the disk portion 121a is extended outward is to increase the creepage distance and improve the adhesion to the resin for the secondary molding.
- the cross section of the second region 122 has a cross shape, and the width W of the second region 122 is the same as that of the first region 121.
- the width here is the arrangement of the lead wire pairs 112 and 113
- the lead wire pairs 112 and 113 are located at both ends in the width direction in the second region 122. In the area where the lead wire pairs 112 and 113 in the second area 122 are arranged, the height H (the direction intersecting the width direction; Y direction) is the first area.
- the third region 123 is connected to the second region 122.
- the third region 123 is wider than the second region 122 and accommodates the above-mentioned crimp terminals 116 and 117 for connecting the lead wire pairs 112 and 113 and the springs 114 and 115.
- a through-hole 124 whose longitudinal direction faces in a direction (Y direction) intersecting with the parallel direction of the lead wires is formed between the crimp terminals 116 and 117, that is, between the lead wire pairs 112 and 113.
- a pair of fixing portions 127 protrude from the upper and lower surfaces of the through hole 124 in the third region 123 in the figure (see FIGS. 8 and 10).
- the fixing portions 127, 127 each have a groove having a V-shaped cross section, and the primary molded body can be positioned at the time of secondary molding by bringing a fixing bar into contact with the groove. Further, a pair of thin plate portions 125, 126 are provided upright at both upper ends of the third region 123, and the force conducting wires 114, 115 between the thin plate portions 125, 126 extend upward.
- a substantially rectangular parallelepiped protective portion 128 that covers the periphery of the conductive wires 114 and 115 is formed.
- the protection part 128 is formed integrally with the first, third and third regions from the same material and serves to prevent the conductive wires 114 and 115 from being damaged by contact with the mold during the secondary molding. Have. It is not always necessary to provide a protective part for bending such a conductive wire.
- the outer resin part 150 defines the outer shape of the temperature sensor 101, and covers an area of the resin part 120 excluding most of the first area 121. In other words, the shape of the area that comes into contact with water, oil, or the like to be subjected to temperature measurement is determined by primary molding. Lower part of outer resin part 150 in the figure A pair of ring portions 151 and 152 are formed in the region of the portion, and a ring groove 153 for fitting an O-ring is formed therebetween.
- a rectangular parallelepiped key receiving portion 154 into which a key plate described later is inserted is formed above the upper ring portion 152 of the outer resin portion 150.
- the key receiving portion 154 has a thickness in the Y direction narrower than that of the ring portion 152 located below and the rectangular parallelepiped head 155 located above in order to prevent the key plate from being displaced in the vertical direction. It's getting done.
- a protrusion 156 is formed on one side surface of the head 155.
- the conductors 114 and 115 that protrude in the vertical direction (Z direction) in the primary molded body are bent at substantially right angles to extend from the protrusion 156. It is protruding.
- FIG. 11 shows an application example of such a temperature sensor 101.
- the figure shows an example in which the temperature sensor 101 is applied to the temperature measurement of the oil F of an automatic transmission, and is attached to a case 160 that stores the oil F.
- a circular through hole 160h is formed in the case 160, and the ring portions 151 and 152 of the temperature sensor 101 are accommodated in the through hole 160h.
- An O-ring is fitted into the ring groove 153 to seal a gap between the case 160 and the temperature sensor 101.
- the first region 121 of the resin part 120 is immersed in the oil F.
- a key plate 161 is inserted into a key receiving portion 154 located outside the case 160, and the key plate 161 is fixed to the case 160 by screws 162.
- ECU electronice control unit
- the thermistor 110 is accommodated in the first region 121 of the resin portion 120 immersed in the oil F in the case 160. That is, the thermistor 110 is covered only with the resin part 120 made of PPS. Thus, the first region 121 covers the thermistor 110 only with the resin portion 120, and does not use a conductive holder. Therefore, the thermistor 110 and the pair of lead wires 112 and 113 do not contact the conductor.
- the temperature sensor 101 needs to consider insulation between the thermistor and the harness pair and the conductor when housing the thermistor in the holder. Since there is no sensor, the manufacturing operation of the sensor is simplified, and the efficiency of the manufacturing operation is improved.
- a method of manufacturing the temperature sensor 101 and a mold for the temperature sensor suitably used in the method will be described.
- a mold (mold for temperature sensor) 170 for insert molding (primary molding) the temperature sensor 101 is prepared. Forces using fixed-side mold and movable-side mold as molds Here, only the fixed-side mold 170 will be described in detail.
- the type on the moving side can be determined according to the outer shape of the temperature sensor.
- the cavity of the mold 170 includes a first cavity region 171 for forming the first region 121 of the resin part 120, a second cavity region 172 for forming the second region 122 which is continuous with the region 171, and There is a third cavity region 173 that is continuous with the region 172 and forms the third region 123.
- the width W of the second cavity region 172 is smaller than the width W of the first cavity region 171.
- a space 174 for allowing the injected resin to reach the tip of the first cavity region 171 is formed in the first cavity region 171 on the side opposite to the second cavity region 172.
- a partition wall 175 that forms the through hole 124 is provided upright.
- a similar partition wall 181 (see FIG. 13) is provided on the mold on the moving side, so that the partition walls 175 and 181 come into contact with each other when the mold is clamped.
- a groove 176 for forming the fixed portion 127 of the primary molded body is provided on the partition wall 175 on the side opposite to the second cavity region 172. The groove 176 has such an inclination that the center is the shallowest and both ends are the deepest.
- the third cavity region 172 is provided with spaces 177 and 178 for forming the thin plate portions 125 and 126 of the primary molded body. Spaces 177 and 178 are connected to a protection portion cavity region 179 for forming a protection portion 128 for protecting the conductors 114 and 115.
- the mold 170 includes various other known elements. Such elements include, for example, a gate for injecting resin into the cavity, an ejector pin for removing the molded body from the mold, a guide pin and a guide pin for accurately fitting the fixed and movable molds. Bush and the like.
- the thermistor 110 is set on the mold 170. At this time, as shown in FIG. 12, the temperature sensing portion 111 is located in the first cavity region 171 and the second cavity region is located. At 172, a pair of lead wires 112, 113 force S to make the same IJ. Also, lead wires 112 and 113 are passed one by one on both sides of the partition wall 175. After setting the thermistor 110, the movable mold is moved toward the fixed mold 170, and the mold is clamped.
- FIG. 13 is a cross-sectional view of the clamped state in the XIII-XIII direction of FIG.
- Reference numeral 180 indicates a mold on the moving side.
- the second cavity region 172 has a width W smaller than the width W of the first cavity region 171 as well as the lead wires 112 and 113.
- a high-pressure resin is injected into the cavity through the gate, and insert molding is performed. Since a highly fluid PPS resin is used here, even if the mold shape is complicated, the resin spreads to every corner of the cavity and high-precision resin molding can be realized. Also, since the resin has high thermal conductivity, it does not hinder the temperature detection level of the thermistor. Further, since the mold 170 is configured as described above, in the process of injecting the resin into the first cavity region 171 and the second cavity region 172, the resin is simultaneously injected into the protection portion cavity region 179. be able to. This eliminates the necessity of performing two injection moldings in the process of forming the first region 121 and the second region 122 and the process of molding the protection portion 128, thereby reducing the number of resin injections. In addition, simplification of the manufacturing operation can be achieved.
- the manufacturing method described above has the following effects. That is, even if pressure is applied to the thermistor 110 during resin injection and the thermistor 110 is displaced, the lead wires 112, 113 force S come into contact with the inner wall surfaces 172a, 172b of the second cavity region 172, and thus the thermistor 110 The movement of 110 is regulated. Therefore, it is possible to prevent the temperature sensing portion 111 from reaching the inner wall surfaces 171a and 171b of the first cavity region 171 during insert molding. Thereby, in the obtained temperature sensor 101, the situation where the temperature sensing part 111 of the thermistor 110 is exposed on the surface of the resin part 120 covering the same is suppressed. Since the exposure of the temperature sensitive part 111 is suppressed, it is not necessary to cover the first area 121 where the thermistor 110 is located in the secondary molding described later, and the resin size around the temperature sensitive part 111 is reduced. The size can be reduced.
- the height H of the area where the lead wires 112 and 113 are arranged in the second cavity area 172 is Is lower than the height H of the first cavity region 171,
- the thermistor 110 is displaced in the height direction, the movement of the leads, the wires 112 and 113 can be restricted by the inner wall surfaces 172c and 172d of the second cavity region 172.
- the situation of reaching the inner wall surfaces 171c and 171d of the 171 can be suppressed. For this reason, the situation where the temperature sensing part 111 is exposed on the surface of the resin part 120 that covers the temperature sensing part 111 can be further effectively suppressed.
- the thermistor 110 is set in a mold 170 so as to pass through the lead wires 112 and 113, one by one, on both sides of the partition wall 175, and then laid. For this reason, since the partition wall 175 (therefore, the reed springs 112 and 113 can be restricted from moving toward each other, the displacement of the thermistor 110 can be suppressed more effectively.
- the mold is opened, and the molded body is taken out of the mold by using edge tapping pins. Next, a portion connecting the protection portion 128 and the thin plate portions 125 and 126 is cut, and a portion formed by the space 174 is cut off. As a result, the primary compact shown in FIGS. 8 to 10 is obtained.
- the linearly extending conductive wires 114 and 115 are bent at substantially right angles, and the first region 121 covering the thermistor 110 is inserted into the through hole of the mold 185, while the protective portion 128 covering the conductive wires 114 and 115 is formed. It is clamped by a pair of lower mold 190 and upper mold 191. That is, the resin is not molded around the first region 121 (the region where the leading end partial force is also close to the second region 122) in the secondary molding. Further, a bar 192 is attached to the inner surface of the lower die 190 forming the cavity, and the bar 192 is configured to abut on one of the fixing portions 127 of the primary molded body.
- the movable mold 194 is moved and clamped. At this time, the bar 193 attached to the mold 194 comes into contact with the other fixing portion 127 of the primary molded body, so that the primary molded body can be positioned and fixed in the mold.
- a resin is injected from the gate of the mold, and secondary molding is performed.
- the PPS resin is injected similarly to the primary molding, but another resin may be used.
- Second order In the shape, as described above, the conductive wires 114 and 115 are sandwiched by the lower mold 190 and the upper mold 191 via the protection portion 128, so that damage received from these molds can be suppressed.
- resin injection for secondary molding open the mold and remove the molded body from the mold using ejecta pins. Thereby, the temperature sensor 101 shown in FIGS. 4 and 6 is obtained.
- the outer shape of the first region 121 covering the temperature sensing portion 111 of the thermistor 110 is determined only by primary molding, and the first region 121 is formed by secondary molding. Since it is not necessary to cover 21, the size of the resin around the temperature sensing portion can be reduced. In addition, the amount of resin used can be reduced, and the cost can be reduced.
- the outer resin portion formed by the secondary molding may be entirely removed as long as it covers the resin portion except at least a part of the first region 121. Further, an area other than the first area may be excluded.
- the temperature sensor may be manufactured only by the primary molding without performing the secondary molding.
- the present invention is not limited to the above embodiment, and various modifications are possible.
- the angle of the return part formed on the holder with respect to the holder side wall is not limited to vertical (90 degrees), but may be changed within the range of 0 to 90 degrees as long as the sensor cover is locked to the holder.
- Power S can.
- the shape of the neck portion is not limited to the T-shape, and may be a bar shape or a plate shape as long as it can appropriately guide the harness.
- the resin forming the holder and the resin forming the filling resin portion are not limited to the combination of the PPS resin and the epoxy resin.
- the resin forming the holder is a liquid crystal polymer, polyamide, polyimide or the like, and the resin forming the holder and the resin forming the filling resin portion may be the same.
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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CN200480017410.1A CN1809733B (zh) | 2003-06-25 | 2004-06-22 | 温度传感器 |
US10/559,763 US7410294B2 (en) | 2003-06-25 | 2004-06-22 | Temperature sensor |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2003-181598 | 2003-06-25 | ||
JP2003181598A JP4041018B2 (ja) | 2003-06-25 | 2003-06-25 | 温度センサ |
JP2003-188511 | 2003-06-30 | ||
JP2003188511A JP2005024344A (ja) | 2003-06-25 | 2003-06-30 | 温度センサ |
Publications (1)
Publication Number | Publication Date |
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WO2005001404A1 true WO2005001404A1 (ja) | 2005-01-06 |
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PCT/JP2004/008752 WO2005001404A1 (ja) | 2003-06-25 | 2004-06-22 | 温度センサ |
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US (1) | US7410294B2 (ja) |
JP (2) | JP4041018B2 (ja) |
KR (1) | KR100810937B1 (ja) |
CN (1) | CN1809733B (ja) |
WO (1) | WO2005001404A1 (ja) |
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- 2004-06-22 US US10/559,763 patent/US7410294B2/en not_active Expired - Fee Related
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- 2004-06-22 WO PCT/JP2004/008752 patent/WO2005001404A1/ja active Application Filing
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105719782A (zh) * | 2014-12-19 | 2016-06-29 | Tdk株式会社 | 热敏电阻 |
CN105719782B (zh) * | 2014-12-19 | 2018-06-05 | Tdk株式会社 | 热敏电阻 |
US20220221361A1 (en) * | 2021-01-12 | 2022-07-14 | Hitachi Metals, Ltd. | Physical quantity sensor-fixing structure |
US12066303B2 (en) * | 2021-01-12 | 2024-08-20 | Proterial, Ltd. | Physical quantity sensor-fixing structure |
Also Published As
Publication number | Publication date |
---|---|
CN1809733B (zh) | 2010-04-14 |
US20070110124A1 (en) | 2007-05-17 |
JP2005017088A (ja) | 2005-01-20 |
KR100810937B1 (ko) | 2008-03-10 |
CN1809733A (zh) | 2006-07-26 |
JP2005024344A (ja) | 2005-01-27 |
JP4041018B2 (ja) | 2008-01-30 |
US7410294B2 (en) | 2008-08-12 |
KR20060018266A (ko) | 2006-02-28 |
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