JPH0915058A - Temperature sensor and method of manufacturing the same - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a low-cost temperature sensor with a reduced number of parts and improved assembly efficiency. A temperature sensor in which a temperature-sensitive element A2 is housed inside a metal case 1 having a cylindrical shape with a bottom, wherein the outer periphery of the metal case 1 is surrounded by an insulating tube 6 and the temperature-sensitive element A2 is provided. The conductive spring 4 is pressed and fixed, and a terminal C11 is provided on the conductive spring 4 to electrically connect the metal case 1 and the temperature sensitive element A2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature sensor in which a temperature sensitive element is sealed in a metal case.

[0002]

2. Description of the Related Art A conventional temperature sensor is shown in FIG. The conventional temperature sensor has a bottomed cylindrical metal case 1 having a substantially T-shaped cross section.
The temperature sensitive element A2a is inserted and fixed to the bottom of a, and the terminal A5a and the end of the pattern 14 are soldered to the temperature sensitive element B3a, the mounting board 12, and the inner case 7a, and the conductive spring 4a and the lid 16 are provided.
The opening 10a of the metal case is caulked to be formed by pressing.

The terminal B9a, the terminal C11a, the temperature sensitive element A2a, the temperature sensitive element B3a, and the terminal A5a are electrically connected to a substrate 12 having a pattern 14 formed thereon through a lead wire 13. Further, the temperature sensitive element A2a and the metal case 1a are also electrically connected.

An insulating tube 6a is provided to insulate the side surface of the temperature sensitive element A2a from the metal case 1a.

As a cushioning material for crimping the lid 16, the lid 1
A rubber packing 8a is provided in the vicinity of the caulked portion between 6 and the metal case 1a. Also, the terminal B9a and the terminal C1
In order to protect the connection between 1a and the lead wire 13, resin 1
5 is applied.

[0006]

However, the structure of the conventional temperature sensor as described above has a drawback that the number of parts is large and the work efficiency at the time of assembly is poor.

An object of the present invention is to reduce the number of parts,
It is an object of the present invention to provide a low-cost temperature sensor with improved efficiency during assembly and a manufacturing method thereof.

[0008]

In order to solve the above-mentioned problems, a temperature sensor according to the present invention is a temperature sensor in which a temperature-sensitive element A and a temperature-sensitive element B are housed in a cylindrical metal case having a bottom. At the bottom of the metal case, with an insulating tube,
A disk-type temperature sensitive element A having electrodes formed on both sides is pressed and fixed by a conductive spring so as to surround the outer periphery, and a signal detection terminal C is provided on the conductive spring, and the metal case and the sensor are provided. A temperature sensor characterized in that the temperature element A and the terminal C are electrically connected, and the temperature sensor A and the temperature element B are housed in a cylindrical metal case having a bottom. Then, a disk-type temperature sensitive element A having electrodes formed on both sides is pressed and fixed by a conductive spring to the bottom of the metal case so as to surround the outer circumference with an insulating tube, and a signal is detected on the conductive spring. In the temperature sensor in which the terminal C is provided to electrically connect the metal case, the temperature sensitive element A, and the terminal C, the temperature sensitive element A is pressed against the bottom of the metal case as the conductive spring. , A bent conductive spring integrated with the terminal C Used at a temperature sensor is ,, or wherein a temperature sensor is characterized in that electrically connecting the temperature sensitive device A and the metal casing,
A temperature sensor characterized in that a molded body in which the terminal C and a lid covering the opening of the metal case are integrally molded with resin is fixed to the inside of the metal case,
Or the temperature sensor described above, the method of manufacturing the temperature sensor, wherein the lid that covers the opening of the metal case, the temperature sensitive element B, and the terminal C are integrally molded. In the sensor, a method for manufacturing a temperature sensor is characterized in that the conductive spring and the terminal C are integrally molded.

[0009]

The temperature sensing element A is pressed against the inside of the insulating tube by a conductive spring and fixed to the bottom of the metal case, and the metal case, the temperature sensing element and the signal detecting terminal C are electrically connected. , The lid, the terminals B and C, and the temperature-sensitive element B are integrally formed of resin, and the temperature-sensitive element A is pressed against the bottom of the metal case. The bent conductive spring is integrated with the terminal C for signal detection. By electrically connecting the metal case and the temperature sensitive element A by using, and integrally molding the terminals B, C, the temperature sensitive element B and the conductive spring with resin, the number of parts is reduced, Cost can be reduced, working time can be shortened, and a low cost temperature sensor can be provided.

[0010]

1 shows a temperature sensor according to a first embodiment of the present invention. In the temperature sensor of the present embodiment, the entire shape is a bolt having a hexagonal nut, the total length is about 40 mm, the head has a diameter of 24 mm, the lower part has a cylindrical shape, the outer diameter is 16 mm, and the inner diameter is 1.
A disc-shaped temperature-sensitive element A2 having a plate-like diameter of φ7 mm × 5 mm so as to surround the outer circumference with an insulating tube 6 at the bottom of a bottomed metal case 1 made of a brass material of 1 φmm and having a substantially T-shaped cross section.
Is inserted and fixed. On the surface of the temperature sensitive element A2, the terminal A5 and the spiral conductive spring 4 are arranged so as to be located inside the insulating tube 6, and a signal detecting device is provided via the terminal A5 and the conductive spring 4. It is electrically connected to the terminal C11. The insulating tube 6 is a side surface of the temperature sensitive element A2,
It is provided to insulate the metal case 1 from the terminal A5, the conductive spring 4 and the terminal C11. The temperature sensitive element A2
Detects the contact temperature of the bottom of the metal case 1.

Further, the temperature sensitive element B3, the terminal B9 and the terminal C
11 is integrally molded with resin and is fixed inside the metal case 1 in a molded body 7 having a substantially T-shaped cross section. The temperature sensitive element B3 detects the temperature of the position where the molded body 7 is installed. At this time, the opening 10 of the metal case 1 is crimped in a state where the temperature sensitive element A2 is pressed against the bottom of the metal case 1 by the molded body 7 via the terminal A5 and the conductive spring 4.

A rubber packing 8 is provided on the contact surface between the molded body 7 and the metal case 1 as a cushioning material for crimping the molded body 7.

The temperature sensor of the second embodiment of the present invention is shown in FIG.
Shown in In the temperature sensor of the second embodiment, a temperature-sensitive element A2A having a plate diameter φ7 mm × 5 mm is inserted and fixed to the bottom of the same metal case 1A as that of the first embodiment so as to surround the outer circumference with an insulating tube 6A. There is. A bent conductive spring 4A integrated with the terminal C11A is installed on the surface of the temperature sensitive element A2A and electrically connected.

Further, the temperature sensitive element B3A and the signal detecting terminal B9A are integrally molded and fixed inside a metal case 1A in a molded body 7A having a substantially T-shaped cross section. At this time,
The metal case 1A and the temperature sensitive element A are fixed in a state where the temperature sensitive element A is pressed against and fixed to the bottom of the metal case 1A by the bent conductive spring 4A integrated with the terminal A11A fixed in the molded body 7A. It is electrically connected to the bent conductive spring.
Further, the opening 10A of the metal case 1A is crimped.

Side surface of temperature sensitive element A2A and conductive spring 4A
Insulation tube 6A for insulation between metal case 1A and
Is provided.

A rubber packing 8A is provided as a cushioning material when the molded body 7A is caulked.

[0017]

As described above, according to the first and second embodiments of the present invention, not only the cost of members is reduced, but also the assembling and working time is shortened, which facilitates the manufacture. Was
A low-cost temperature sensor can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a temperature sensor according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a temperature sensor according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a conventional temperature sensor.

[Explanation of symbols]

 1, 1a, 1A Metal case 2, 2a, 2A Temperature sensing element A 3, 3a, 3A Temperature sensing element B 4, 4a, 4A Conductive spring 5, 5a Terminal A 6, 6a, 6A Insulation tube 7, 7a, 7A Molded body 8, 8a, 8A Rubber packing 9, 9a, 9A Terminal B 10, 10a, 10A Opening 11, 11a, 11A Terminal C 12 Mounting board 13 Lead wire 14 Pattern 15 Resin 16 Lid

Claims (5)

[Claims] 1. A temperature sensor in which a temperature-sensitive element A and a temperature-sensitive element B are housed in a cylindrical metal case having a bottom, wherein an insulating tube is provided at the bottom of the metal case so as to surround the outer circumference.
A disk type temperature sensitive element A having electrodes formed on both sides is pressed and fixed by a conductive spring, and a signal detection terminal C is provided on the conductive spring, and the metal case, the temperature sensitive element A and the terminal are provided. A temperature sensor characterized by being electrically connected to C. 2. A temperature sensor having a temperature-sensitive element A and a temperature-sensitive element B housed in a cylindrical metal case having a bottom, wherein the outer periphery is surrounded by an insulating tube at the bottom of the metal case,
A disk type temperature sensitive element A having electrodes formed on both sides is pressed and fixed by a conductive spring, and a signal detection terminal C is provided on the conductive spring, and the metal case, the temperature sensitive element A and the terminal are provided. In a temperature sensor electrically connected to C, a bent conductive spring integral with the terminal C is used as the conductive spring for pressing the temperature sensitive element A against the bottom of the metal case. A temperature sensor characterized in that a case and the temperature sensitive element A are electrically connected. 3. The temperature sensor according to claim 1, wherein the terminal C and a lid that covers the opening of the metal case are integrally molded with resin, and the molded body is fixed to the inside of the metal case. A temperature sensor characterized in that 4. The temperature sensor according to claim 1, 2, or 3, wherein a lid that covers the opening of the metal case, the temperature sensitive element B, and the terminal C are integrally molded. Production method. 5. The temperature sensor according to claim 1, 2, or 3, wherein the conductive spring and the terminal C are integrally molded.