JPH10185704A - Temperature sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a temperature sensor which protects a temperature detecting element from being broken down due to the pressure of a high-pressure oil by a method wherein the temperature detecting element in which a conductor is connected to a terminal is inserted into a protective pipe so as to be fixed by a cushioning material and a sensor body is insert-molded so as to cover the circumference and the opening part of the protective pipe. SOLUTION: A temperature sensor 1 is provided with a temperature detecting element 3 which is housed in the bottom part of a protective pipe 2, with conductors 4 which are connected to the detecting element 3 and which are insulated by protective tubes 4a, with terminals 5 base end parts 5a of which are situated inside the pipe 2, which are connected to the conductors 4 and tip parts 5b of which protrude from the opening part of the pipe 2, with an insulating cushioning material 6 which is filled so as to cover the conductors 5 in connection parts 45 from the pipe 2 and with a sensor body 7 which is insert-molded so as to cover the circumference and the opening part of the pipe 2. Thereby, since the detecting element 3 is protected by the pipe 2, it is possible to protect the detecting element 3 from being broken down due to the pressure of a high-pressure oil when the temperature of hot water is detected. Consequently, it is possible to obtain the temperature sensor 1 whose reliability is high when the temperature of the high-pressure oil is measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature sensor provided in, for example, various engines of an automobile and detecting the temperature of oil, water, etc. in the engine.

[0002]

2. Description of the Related Art As a temperature sensor of this type, for example, a temperature sensor disclosed in Japanese Utility Model Laid-Open No. 6-33636 is known. This temperature sensor is configured by soldering a thermistor (temperature detecting element) to a base end of a terminal, and insert-molding a sensor body with a resin so as to cover the thermistor and the base end of the terminal.

[0003]

In the above-described conventional temperature sensor, the temperature of low-pressure oil is measured.
It was possible to sufficiently protect the thermistor just by covering the periphery with resin. However, when measuring the temperature of the high-pressure oil, the pressure of the high-pressure oil may act on the thermistor via the resin.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to prevent high-pressure oil from acting on a temperature detecting element even in high-pressure oil temperature measurement. It is to provide a temperature sensor that can be used.

[0005]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 comprises a protective pipe having a bottom, a temperature detecting element housed in the bottom of the protective pipe, and a temperature detecting element. A conductor connected to the element, a terminal whose base end is inside the protection pipe and connected to the conductor, and whose tip projects from the opening of the protection pipe; and at least a conductor and the terminal from the bottom of the protection pipe. A cushioning material having an insulating property filled up to a portion covering the conductor of the connection portion, and a sensor body insert-molded so as to cover the periphery and the opening of the protection pipe with the tip of the terminal protruding. It is characterized by having.

According to a second aspect of the present invention, in the first aspect of the present invention, the cushioning material is obtained by injecting a silicone adhesive into a protective pipe and curing the silicone adhesive.

According to a third aspect of the present invention, in the first or second aspect of the invention, a convex portion is formed on an outer peripheral surface of the protection pipe to prevent the movement of the protection pipe with respect to the sensor body. It is characterized by:

According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, a lid is provided at an opening of the protective pipe.

According to a fifth aspect of the present invention, in the first, second, third or fourth aspect of the present invention, the terminal is temporarily fixed to the wall of the opening of the protective pipe by press-fitting. Is formed.

According to a sixth aspect of the present invention, in the first, second, third, fourth, or fifth aspect, a metal case is provided around a portion corresponding to the temperature detecting element in the protective pipe. It is characterized by having provided.

The invention according to claim 7 is characterized in that, in the invention according to claim 6, a press-fitting rib that is deformed when pressed into a metal case is formed on an outer peripheral surface of the protective pipe.

The invention according to claim 8 is the invention according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, or claim 7, wherein the outer peripheral surface of the sensor body is It is characterized in that two grooves extending in parallel are formed, a key portion is inserted into each of the grooves, and a key plate for fixing the sensor body at a predetermined position on the measured side is provided. I have.

[0013] The first aspect of the present invention is configured as described above.
In the invention according to the present invention, the one obtained by inserting the temperature detecting element connected to the conductor and the terminal into the protective pipe and hardening it with the cushioning material,
It is manufactured in advance as a subassembly. Then, the sensor main body is insert-molded so as to cover the periphery and the opening of the protection pipe in the subassembly.

The temperature sensor thus manufactured is
Since the temperature detecting element is protected by the protection pipe, it is possible to prevent the high-pressure oil from acting on the temperature detecting element when measuring the temperature of the high-pressure oil. Therefore, a highly reliable temperature sensor can be provided for measuring the temperature of high-pressure oil.

Moreover, since the cushioning material is filled from the bottom of the protective pipe to at least cover the conductor at the connection between the conductor and the terminal, the molding pressure when insert-molding the sensor body increases the temperature detecting element, the conductor, and It can be prevented from acting on the connection between the conductor and the terminal. That is, it is possible to prevent the molding pressure from destroying the temperature detecting element, the conducting wire, and the connecting portion between the conducting wire and the terminal, thereby improving the yield.

[0016] Further, there is an advantage that an integrated sub-assembly can be easily manufactured by putting the connection of the temperature detecting element, the conducting wire and the terminal into the protective pipe.

Moreover, by integrally forming the subassembly, the sensor main body can be easily insert-molded.

In the invention according to the second aspect, since the silicone adhesive is used as the cushioning material, the cushioning material can be filled in the protective pipe so that no air layer remains. That is, by injecting the liquid silicone adhesive into the protective pipe, it is possible to form a buffer material that has been sufficiently defoamed.

The silicone adhesive has sufficient elasticity even after curing, and is advantageous in protecting the temperature detecting element, the conductor, and the connection between the conductor and the terminal.

Further, since the silicon adhesive is hardly deteriorated even at a high temperature, it is possible to stably protect the temperature detecting element, the conductor, and the connection between the conductor and the terminal for a long period of time.

According to the third aspect of the present invention, the protection pipe is provided with a convex portion on the outer peripheral surface thereof for preventing relative movement with the sensor main body, so that the protection pipe and the sensor main body can be more firmly integrated. Can be. That is, when measuring the temperature of oil under high pressure, the pressure of the oil directly acts on the protection pipe. However, since the sensor main body side is fixed to the case on the measured side, the oil pressure acts to push the protection pipe out of the sensor main body. However, as described above, since the connection between the protection pipe and the sensor main body is strengthened by providing the convex portion on the outer peripheral surface of the protection pipe, the protection pipe moves with respect to the sensor main body even when exposed to high pressure. Nothing to do.

According to the fourth aspect of the present invention, since the cover is provided at the opening of the protective pipe, the temperature detecting element, the conducting wire, and the connecting portion between the conducting wire and the terminal are more sufficiently than the case where the protective pipe is protected by the cushioning material. Can be protected against molding pressure. In addition, for example, even when the filling amount of the cushioning material is small, the lid can protect the temperature detecting element, the conductor, and the connection between the conductor and the terminal from the molding pressure.

In the invention according to claim 5, since the terminal is provided with a concave portion and is temporarily fixed to the end of the opening of the protective pipe by press-fitting, variation in the height of the terminal protruding from the protective pipe is reduced. Accordingly, the variation in the height of the terminal projecting from the sensor body to be insert-molded can be reduced.

In the invention according to claim 6, since the metal case is provided around the portion corresponding to the temperature detecting element in the protection pipe, the thermal conductivity of the portion corresponding to the temperature detecting element can be improved. . Therefore, the sensitivity of the detected temperature can be improved. The metal case also has the effect of protecting the protection pipe and protecting the temperature detecting element from high oil pressure.

In the invention according to claim 7, since the press-fitting rib is provided on the outer peripheral surface of the protection pipe, the protection pipe can be easily press-fitted into the metal case.
By this press-fitting, the protection pipe and the metal case can be firmly connected.

In the invention according to claim 8, since the key portion is inserted into the two grooves of the sensor main body and the key plate for fixing the sensor main body at a predetermined position on the measured side is provided, the temperature sensor is provided. Can be securely fixed to the measured side and the rotation of the temperature sensor can be prevented.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. 1 to 14 show the first embodiment, FIGS. 15 to 16 show the second embodiment, and FIG. 17 shows the third embodiment.

First, a first embodiment will be described with reference to FIGS. That is, the temperature sensor 1 shown in this embodiment comprises a bottomed protection pipe 2 and this protection pipe 2.
Thermistor (temperature detection element) 3 housed in the bottom of the inside
And two conductors 4 connected to the thermistor 3 and insulated by a protection tube 4a, and a base end 5a in the protection pipe 2 and connected to each conductor 4, and a distal end 5b connected to the protection pipe 2 Two terminals 5 protruding from the opening of the protective pipe 2, and a buffer material 6 having an insulating property filled from at least a portion of the connection portion 45 between the conductor 4 and the terminal 5 covering the conductor 5 from the bottom of the protection pipe 2. A sensor main body 7 is formed by insert molding so as to cover the periphery and the opening of the protection pipe 2 with the distal end of the terminal 5 protruding.

The protection pipe 2 is formed by a bottomed cylindrical portion 2a on the lower side from the approximate center in the axial direction, and is formed by a flattened enlarged portion 2b on the upper side. On the outer peripheral surface of the upper portion of the cylindrical portion 2a, a convex portion 2c that protrudes annularly is formed.
The convex portion 2c is attached to the protective pipe 2 with respect to the sensor body 7.
Is prevented from moving in the axial direction.

A metal case 8 is attached to the cylindrical portion 2a by press fitting. As shown in FIGS. 9 and 10, a press-fit rib 2 d that is deformed when press-fitted into the metal case 8 is formed in a portion of the cylindrical portion 2 a corresponding to the metal case 8.

The metal case 8 is provided so as to be in close contact with the outer periphery of a portion corresponding to the thermistor 3 in the cylindrical portion 2a from the bottom. In the opening of the metal case 8, an annular rib 8a extending outward is formed. This annular rib 8a is attached to the metal case 8
Is prevented from moving in the axial direction.

On the flattened enlarged diameter portion 2b of the protection pipe 2, a ridge 2e for holding the conductor 4 and the terminal 5 (see FIG. 9).
Are formed, and a lid 9 is provided so as to close the opening. As shown in FIG. 6, the cover 9 has a groove 9a through which the two terminals 5 pass.

The terminal 5 has a base 5a and a tip 5b bent at a right angle, and is temporarily fixed to the upper part of the base 5a by press-fitting into the wall of the opening of the flattened enlarged portion 2b. Recess 5c is formed. Further, an oblique cutout 5d for connecting the conductor 4 to the terminal 5 without hitting the protective tube 4a is formed in the base end 5a. Further, a through hole 5 for connecting the lead wire 10 is formed in the tip 5b.
e is formed. The connecting portion 45 between the conductive wire 4 and the terminal 5 is connected by spot welding, and the lead wire 10 and the terminal 5 are connected by soldering.

The cushioning material 6 is obtained by injecting a silicone adhesive into the protection pipe 2 and hardening the same. The cushioning material 6 is sealed by the lid 9. The cushioning material 6 made of the silicone adhesive is also filled between the protection pipe 2 and the metal case 8.
And are firmly connected.

The sensor body 7 is formed so as to cover the temperature detecting portion of the thermistor 3 from above. The sensor body 7 covers the metal case 8 and the protection pipe 2 and also covers the lid 9 from above. It is configured as follows. A groove 7 a for guiding the lead wire 10 is formed on the upper surface of the sensor body 7. As shown in FIG. 3, triangular irregularities are formed on the side surfaces of the groove, so that the lead wire 10 is securely held.

The sensor body 7 has a cylindrical portion 7b at a portion substantially below the center thereof.
As shown in FIGS. 11 to 12, the case 11 on the measured side
Is inserted into the temperature measurement hole 11a formed in the hole. An O-ring groove 7c for providing an O-ring 12 for sealing between the cylindrical portion 7b and the temperature measurement hole 11a is formed.

Further, two parallel grooves 7d are formed in the sensor body 7 on the upper outer peripheral surface of the cylindrical portion 7b. As shown in FIGS. 11 to 13, the sensor body 7 is fixed to the case 11 by a key plate 13 having a key portion 13a inserted into each groove 7d. The key plate 13 has a through hole 13b, and is fixed to the case 11 by a bolt (not shown) screwed into the case 11 through the through hole 13b.

A cover 14 is provided on the case body 7 so as to be detachable so as to cover the connection between the terminal 5 and the lead wire 10 and the top of the case body 7.

In the temperature sensor 1 configured as described above, as shown in FIG. 14, the conducting wire 4 extending from the thermistor 3 is spot-welded to the two terminals 5 connected by the tie bars 15, thereby forming a thermistor. 3 is connected to the conductive wire 4 and the terminal 5. And
After injecting a predetermined amount of the liquid buffer material 6 into the protection pipe 2, the thermistor 3, the conducting wire 4 and the terminal 5 connected as described above are inserted into the protection pipe 2, and the recess 5 c of each terminal 5 is formed. Is temporarily fixed to the wall of the opening of the protection pipe 2 by press-fitting.

Then, the buffer material 6 in a liquid state is injected into the protection pipe 2 and the buffer material 6 is filled to a level at which the tip of the conductive wire 4 at the connecting portion 45 is buried. At this time, the buffer material 6 is injected while performing a defoaming treatment so that an air layer does not remain. Then, after the cushioning material 6 is cured by natural drying or forced drying, the lid 9 is put on the opening of the protective pipe 2.

On the other hand, the metal case 8 and the protection pipe 2 are connected by press-fitting the protection pipe 2 into the metal case 8. At this time, the cushioning material 6 is filled between the metal case 8 and the protection pipe 2 so that the metal case 8 is protected.
And the protection pipe 2 are securely connected.

As described above, a subassembly including the protection pipe 2, the thermistor 3, the conductor 4, the terminal 5, the metal case 8, and the lid 9 is manufactured in advance. Then, the sensor body 7 is insert-molded so as to cover the periphery of the metal case 8, the periphery of the protection pipe 2 and the upper side of the lid 9 in the subassembly. Then, the tie bar 15 is separated from the terminal 5.

The temperature sensor 1 manufactured as described above
Will be attached and used as shown in FIG. That is, in FIG. 11, the lower side of the case 11 is a line pressure oil passage of the hydraulic circuit of the automatic transmission, and the pressure of the high-pressure oil in the line pressure oil passage is applied to the protection pipe 2 via the metal case 8. Works.

Since the thermistor 3 is protected by the protection pipe 2, it is possible to prevent the high-pressure oil from acting on the thermistor 3 when measuring the temperature of the high-pressure oil. Therefore, a highly reliable temperature sensor can be provided for measuring the temperature of high-pressure oil.

Further, since the cushioning material 6 is filled from the bottom of the protective pipe 2 to the tip of the conductive wire 4 and the lid 9 is provided on the upper side of the cushioning material 6, when the sensor body 7 is insert-molded. The molding pressure of the thermistor 3, the conductor 4,
And it can prevent acting on the connection part 45 of the conductor 4 and the terminal 5. That is, it is possible to prevent the thermistor 3, the conductor 4, and the connection part 45 between the conductor 4 and the terminal 5 from being broken by the pressure of the resin when the sensor body 7 is insert-molded, thereby improving the yield. be able to.

Further, there is an advantage that an integrated subassembly can be easily manufactured by putting the connection of the thermistor 3, the conductor 4 and the terminal 5 into the protection pipe 2.

By integrally configuring the subassembly, the sensor body 7 can be easily insert-molded.

Further, since the silicone adhesive is used as the cushioning member 6, the cushioning member 6 can be filled in the protective pipe 2 so that no air layer remains. That is, by injecting the liquid silicone adhesive into the protective pipe 2, it is possible to form the cushioning material 6 which has no air layer and is sufficiently defoamed.

The silicone adhesive has sufficient elasticity even after curing, and the thermistor 3, the conductor 4, and the conductor 4
It is advantageous in protecting the connection portion 45 between the terminal 5 and the terminal 5.

Further, since the silicon adhesive is hardly deteriorated even at a high temperature, the thermistor 3, the conductor 4,
In addition, the connection portion 45 between the conductor 4 and the terminal 5 can be stably protected for a long period of time.

Further, since the convex portion 2c for preventing relative movement with the sensor body 7 is provided on the outer peripheral surface of the protection pipe 2, the protection pipe 2 and the sensor body 7 can be more firmly integrated. . That is, when measuring the temperature of the oil under high pressure, the pressure of the oil acts on the protection pipe 2.

However, since the sensor body 7 is fixed to the case 11 on the measured side, the oil pressure acts on the sensor body 7 so as to push the protection pipe 2.

However, as described above, the projection 2c is provided on the outer peripheral surface of the protection pipe 2 so that the protection pipe 2 and the sensor main body 7 are provided.
Therefore, the protection pipe 2 does not move with respect to the sensor body 7 even when exposed to high pressure. Therefore, the durability of the temperature sensor 1 can be improved.

Further, since the cover 9 is provided at the opening of the protection pipe 2, the thermistor 3, the conductor 4, and the connection portion 45 between the conductor 4 and the terminal 5 are more sufficiently than the case where the protection is performed only with the cushioning material 6. Can be protected against molding pressure. In addition, for example, even when the amount of the buffer material 6 to be filled is small, there is an advantage that the lid 9 can protect the thermistor 3, the conductor 4, and the connecting portion 45 between the conductor 4 and the terminal 5 from molding pressure.

Furthermore, since the terminal 5 is provided with the concave portion 5c and is temporarily fixed to the end of the opening of the protective pipe 2 by press-fitting, the variation in the height of the terminal 5 protruding from the protective pipe 2 can be reduced. Thus, the variation in the height of the terminal 5 protruding from the sensor body 7 to be insert-molded can be reduced.

Furthermore, since the metal case 8 is provided around the portion corresponding to the thermistor 3 in the protection pipe 2, the thermal conductivity of the portion corresponding to the thermistor 3 can be improved. Therefore, the sensitivity of the detected temperature can be improved. Further, the metal case 8 has an effect of protecting the protection pipe 2 and further protecting the thermistor 3 from high pressure oil.

Since the press-fit ribs 2d are provided on the outer peripheral surface of the protection pipe 2, the protection pipe 2 is
The protective pipe 2 and the metal case 8 can be firmly connected by this press-fitting.

Further, since the key portion 13a is inserted into the two grooves 7d of the sensor body 7 and the key plate 13 for fixing the sensor body 7 to the case 11 on the side to be measured is provided, the temperature sensor 1 is 11 can be reliably fixed, and the rotation of the temperature sensor 1 can be prevented.

Next, a second embodiment of the present invention will be described with reference to FIG.
5 and FIG. However, the same reference numerals are given to the elements common to the constituent elements of the first embodiment,
The description will be simplified. The difference between the second embodiment and the first embodiment is that a flange 7e is provided below two parallel grooves 7d provided in the sensor main body 7.

The temperature sensor thus configured also has the same operation and effect as the first embodiment. However, there is a disadvantage that the dimension L from the case 11 to the top of the temperature sensor 1 is larger than the dimension L of the first embodiment (see FIG. 15) by the provision of the flange 7e. Further, in the case 11, a step must be provided between the surface on which the flange 7e is mounted and the surface on which the key plate 13 is mounted, and there is a disadvantage that the number of processing steps is increased. Therefore, it is preferable to adopt the structure of the first embodiment without the flange 7e as the structure of the groove 7d.

Next, a third embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. However, the same elements as those of the first embodiment are denoted by the same reference numerals, and description thereof will be simplified. The third embodiment is different from the first embodiment in that the terminal 5 is provided with a locking projection 5f,
Is provided with a locking hole 2f.

The temperature sensor thus configured also has the same functions and effects as those of the first embodiment.

In each of the above embodiments, an example is shown in which the thermistor 3 is used as the temperature detecting element. Instead of the thermistor 3, a thermocouple or another temperature detecting element may be used.

Although the cover 9 is provided at the opening of the protective pipe 2, the cover 9 may be provided without the cover 9 so that the cushioning material 6 is exposed. In this case, the resin pressure at the time of forming the sensor body 7 on the cushioning material 6 acts. However, the thermistor 3 and the conductor 4
And the high-pressure resin can be prevented from directly acting on the thermistor 3 and the conductor 4.

Further, the connecting portion 45 between the conducting wire 4 and the terminal 5 is constituted by connecting by spot welding, and the lead wire 10 and the terminal 5 are connected by soldering. , Or by other welding. However, since the connecting portion 45 is sealed by insert molding, it is preferable to use a connecting means capable of securely connecting such as spot welding. On the other hand, lead wire 10 and terminal 5
It is preferable that the connection be made with a material such as solder that can be easily removed.

[0066]

According to the first aspect of the present invention, a protection pipe in which a temperature detection element having a conductor and a terminal connected thereto is inserted and fixed with a cushioning material is manufactured in advance as a subassembly. Then, the sensor main body is insert-molded so as to cover the periphery and the opening of the protection pipe in the subassembly.

The temperature sensor thus manufactured is
Since the temperature detecting element is protected by the protection pipe, it is possible to prevent the high-pressure oil from acting on the temperature detecting element when measuring the temperature of the high-pressure oil. Therefore, a highly reliable temperature sensor can be provided for measuring the temperature of high-pressure oil.

Moreover, since the cushioning material is filled from the bottom of the protective pipe to at least cover the conductor at the connection between the conductor and the terminal, the molding pressure when insert-molding the sensor body increases the temperature detecting element, the conductor, and It can be prevented from acting on the connection between the conductor and the terminal. That is, it is possible to prevent the molding pressure from destroying the temperature detecting element, the conducting wire, and the connecting portion between the conducting wire and the terminal, thereby improving the yield.

[0069] Further, there is an advantage that an integrated sub-assembly can be easily manufactured by putting the connection of the temperature detecting element, the conducting wire and the terminal into the protective pipe.

Moreover, by integrally forming the subassembly, the sensor main body can be easily insert-molded.

In the second aspect of the present invention, since the silicone adhesive is used as the cushioning material, the cushioning material can be filled in the protective pipe so that no air layer remains. That is, by injecting the liquid silicone adhesive into the protective pipe, it is possible to form a buffer material that has been sufficiently defoamed.

The silicone adhesive has sufficient elasticity even after curing, and is advantageous in protecting the temperature detecting element, the conductor, and the connection between the conductor and the terminal.

Further, since the silicon adhesive is hardly deteriorated even at a high temperature, it is possible to stably protect the temperature detecting element, the conductor, and the connection between the conductor and the terminal for a long period of time.

According to the third aspect of the present invention, since the protection pipe is provided on the outer peripheral surface thereof with a projection for preventing relative movement with the sensor main body, the protection pipe and the sensor main body can be more firmly integrated. Can be. That is, when measuring the temperature of oil under high pressure, the pressure of the oil directly acts on the protection pipe. However, since the sensor main body side is fixed to the case on the measured side, the oil pressure acts to push the protection pipe out of the sensor main body. However, as described above, since the connection between the protection pipe and the sensor main body is strengthened by providing the convex portion on the outer peripheral surface of the protection pipe, the protection pipe moves with respect to the sensor main body even when exposed to high pressure. Nothing to do.

According to the fourth aspect of the present invention, since the cover is provided at the opening of the protective pipe, the temperature detecting element, the conducting wire, and the connecting portion between the conducting wire and the terminal are more sufficiently than protected by the cushioning material. Can be protected against molding pressure. In addition, for example, even when the filling amount of the cushioning material is small, the lid can protect the temperature detecting element, the conductor, and the connection between the conductor and the terminal from the molding pressure.

In the invention according to claim 5, since the terminal is provided with a concave portion and is temporarily fixed to the end of the opening of the protective pipe by press-fitting, variation in the height of the terminal protruding from the protective pipe is reduced. Accordingly, the variation in the height of the terminal projecting from the sensor body to be insert-molded can be reduced.

In the invention according to claim 6, since the metal case is provided around the portion corresponding to the temperature detecting element in the protective pipe, the thermal conductivity of the portion corresponding to the temperature detecting element can be improved. . Therefore, the sensitivity of the detected temperature can be improved. The metal case also has the effect of protecting the protection pipe and protecting the temperature detecting element from high oil pressure.

In the invention according to claim 7, since the press-fitting rib is provided on the outer peripheral surface of the protection pipe, the protection pipe can be easily press-fitted into the metal case.
By this press-fitting, the protection pipe and the metal case can be firmly connected.

According to the eighth aspect of the present invention, since the key portion is inserted into the two grooves of the sensor main body and the key plate for fixing the sensor main body at a predetermined position on the measured side is provided, Can be securely fixed to the measured side and the rotation of the temperature sensor can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a temperature sensor shown as a first embodiment of the present invention.

FIG. 2 is a view showing the temperature sensor, which is taken along the line II-II in FIG.
Sectional view along the line.

FIG. 3 is a view showing the temperature sensor, and is a view taken along the line III-
Sectional view along line III.

FIG. 4 is a sectional view showing a subassembly of the temperature sensor.

FIG. 5 is a plan view showing a subassembly of the temperature sensor.

FIG. 6 is a perspective view showing a lid of the temperature sensor.

FIG. 7 is a view showing a subassembly of the temperature sensor,
FIG. 7 is a sectional view taken along the line VII-VII in FIG. 4.

FIG. 8 is a view showing a subassembly of the temperature sensor,
FIG. 5 is a sectional view taken along the line VIII-VIII in FIG. 4.

FIG. 9 is a perspective view showing a protection pipe of the temperature sensor.

FIG. 10 is a diagram showing a protection pipe of the temperature sensor, and is a cross-sectional view taken along line XX of FIG. 9;

FIG. 11 is a sectional view showing a state where the temperature sensor is attached to a case on the side to be measured.

FIG. 12 is a view showing the temperature sensor, and is a view showing X in FIG. 11;
Sectional drawing which follows the II-XII line.

FIG. 13 is a view showing the same temperature sensor, and is Y in FIG.
Sectional drawing along the -Y line.

FIG. 14 is a plan view showing a state where the terminals of the temperature sensor are connected by tie bars.

FIG. 15 is a sectional view showing a state in which the temperature sensor shown as the second embodiment of the present invention is attached to a case on the side to be measured.

FIG. 16 is a view showing the temperature sensor, and is a view showing Z in FIG.
Sectional drawing along the -Z line.

FIG. 17 is a sectional view showing a subassembly of the temperature sensor shown as the third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Temperature sensor 2 Protective pipe 2c Convex part 2d Press-fit rib 3 Temperature detection element (thermistor) 4 Conductor 5 Terminal 5a Base end 5b Tip 5c Concave 45 Connection part 6 Buffer material 7 Sensor body 7d Groove 8 Metal case 9 Lid 13 Key plate 13a Key part

Continued on the front page (72) Inventor Toshiya Morishita Inside Aisin City, Aichi Pref., Takane Fujiimachi Aisin AW Co., Ltd. (72) Inventor Kiyozo Kato 1-7-1 Yokoi, Shimada-shi, Shizuoka Yazaki Keiki Co., Ltd. (72) Inventor Tomoaki Fukuhara 1-7-1, Yokoi, Shimada-shi, Shizuoka Yazaki Keiki Co., Ltd.

Claims (8)

[Claims] 1. A protective pipe having a bottom, a temperature detecting element housed in a bottom portion of the protective pipe, a conductive wire connected to the temperature detecting element, and a conductive wire having a base end in the protective pipe. A terminal, the tip of which protrudes from the opening of the protection pipe, and a cushioning material having an insulating property filled from the bottom of the protection pipe to at least a portion covering the conductor of the connection between the conductor and the terminal, A temperature sensor comprising: a sensor main body that is insert-molded so as to cover a periphery and an opening of the protection pipe with a tip end of the terminal protruding. 2. The temperature sensor according to claim 1, wherein the cushioning material is formed by injecting a silicone adhesive into the protective pipe and curing the silicone adhesive. 3. The temperature sensor according to claim 1, wherein a convex portion for preventing movement of the protective pipe with respect to the sensor body is formed on an outer peripheral surface of the protective pipe. 4. The temperature sensor according to claim 1, wherein a lid is provided at an opening of the protection pipe. 5. The terminal according to claim 1, wherein a concave portion temporarily fixed by press-fitting is formed in a wall of the opening of the protective pipe. 4. The temperature sensor according to 4. 6. The protection pipe according to claim 1, wherein a metal case is provided around a portion corresponding to the temperature detection element.
A temperature sensor as described. 7. The temperature sensor according to claim 6, wherein a press-fitting rib that is deformed when pressed into a metal case is formed on an outer peripheral surface of the protection pipe. 8. An outer peripheral surface of the sensor main body extends in parallel to the sensor body.
2. A key plate which is formed with a plurality of grooves, has a key portion inserted into each of the grooves, and has a key plate for fixing the sensor main body at a predetermined position on the side to be measured. ,
The temperature sensor according to claim 2, 3, 4, 5, 5, 6, or 7.