JP2515121Y2 - Temperature sensor - Google Patents

Description

[Detailed description of the device]

[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 in the engine.

[0002]

2. Description of the Related Art A conventional example of this type of temperature sensor is shown in FIG. In FIG. 9, both ends of the thermistor 1 are connected to one end of terminals 2 and 3, respectively, and the sensor body 4 is formed by insert molding the outside of the thermistor 1 and the terminals 2 and 3 with resin. The other end of the terminals 2 and 3 is the sensor body 4
The metal portions at the tips of the lead wires 5 and 6 are soldered to the protruding ends of the terminals 2 and 3, respectively. The portions 7 where the protruding portions of the terminals 2 and 3 and the metal portions of the lead wires 5 and 6 are soldered are heat-shrinkable tubes 8 and 9, respectively.
It is covered and protected by.

[0003]

However, according to the conventional temperature sensor constructed as described above, the external force applied to the lead wires 5 and 6 is directly applied to the soldered portion 7. Therefore, the external force applied to the lead wires 5 and 6 is always applied to the soldering portion 7 due to handling from soldering to assembly to the engine, vibration during operation after being attached to the engine, and the like. The reliability of soldering may be reduced.

Further, the heat shrinkable tubes 8 and 9 are attached to the soldering portion 7.
There was a problem that the cost was high because the workability was poor and the tube material had to be heat and oil resistant when it was assembled in the above.

Furthermore, unless the metal parts of the terminals 2 and 3 and the lead wires 5 and 6 protruding from the sensor body 4 are surely covered with the heat-shrinkable tubes 8 and 9, when the sensor body 4 is immersed in oil. However, there was also a problem that the electrodes could not function due to the short circuit between the electrodes due to iron powder mixed in the oil.

The present invention has been made in view of the above points, and the reliability of the soldered portion can be ensured even when an external force is applied to the lead wire soldered to the terminal of the sensor body, and An object is to provide a temperature sensor capable of preventing a short circuit between electrodes.

[0007]

In order to achieve the above-mentioned object, the present invention is to connect one end of each terminal to both poles of a thermistor, expose the other end of the terminal, and insert the sensor main body by resin molding. In the temperature sensor configured by soldering the ends of the lead wires to the other ends of the pair of terminals, a wall for partitioning the pair of terminals is formed in the sensor body, and exposed ends of these terminals are formed. Is bent in a U shape, and notches for passing the lead wires are formed on the side surfaces of these terminals facing the wall.

Further, the present invention is characterized in that the sensor body is equipped with a cap for covering a connecting portion between the terminal and the lead wire.

[0009]

According to the above construction, the lead wire passes through the notch formed in the terminal and is then soldered to the tip of the U-shaped bent terminal, so that the lead wire is also bent in the V shape. Therefore, even if an external force is applied to the lead wire, the lead wire is locked by the notch, and no force is applied to the soldered portion. Further, since the connecting portion between the terminal and the lead wire is covered with the cap, it is possible to eliminate the influence from the outside. Further, since the pair of terminals are partitioned by the wall, it is possible to prevent a short circuit between the terminals due to metal powder or the like.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment of the present invention. 1 to 3, one ends of terminals 12 and 13 are respectively connected to both poles of the thermistor 11, and the outsides of the thermistor 11 and the terminals 12 and 13 are insert-molded with resin to form a substantially cylindrical sensor body 14 Is configured. The other ends of the terminals 12 and 13 project from one end surface of the sensor body 14. A wall 15 is formed in the center of the sensor body 14 in the diametrical direction, and the pair of terminals 12 and 13 are isolated from each other to divide the sensor body 14 into two chambers. Furthermore, the end surface of the sensor body 14 on the side where the thermistor 11 is sealed is closed, and a case 16 having good thermal conductivity is attached to the outside of this end surface. Also,
An epoxy resin is filled between the inner peripheral surface of the sensor body 14 and the wall 15, and the terminals 12 and 13 are fixed.

On the other hand, one end of each of the terminals 12 and 13 projecting from the sensor main body 14 is curved in a substantially U shape, and notches 12a and 13a are formed on the side surfaces facing the wall 15, respectively.
Are formed. Further, projections 12b and 13b are formed on the upper portions of the cutouts 12a and 13a in the figure, and they are inserted into the wall 15 and insert-molded. The pair of lead wires 17 drawn from the outside are, as shown in FIG. 3, cutout portions 12a of the terminals 12 and 13,
Through 13a, it is soldered to the U-shaped curved tip.

A cylindrical cap 21 whose one end is substantially sealed as shown in FIGS. 4 and 5 is attached to the end surface of the sensor body 14 from which the terminals 12 and 13 are projected.
2, 13 and the soldering portion 18 are completely covered. A hole portion 21a is formed in the end surface of the cap 21 for inserting the pair of lead wires 17 therein. In addition, a hole 21b into which the projection 15a formed at the tip of the wall 15 is fitted is provided at the center of the end surface of the cap 21 to strengthen the fixation when the cap 21 is attached to the sensor body 14. There is.

FIG. 6 shows a state in which the sensor body 14 is attached to the oil passage 31 of the engine. A concave groove 32 is formed on the outer periphery of the sensor body 14 near the lower end in the drawing.
A ring 33 is attached. The sensor body 14 is liquid-tightly mounted via an O-ring 33 into a mounting hole 34 formed in the wall of the oil passage 31.

According to this embodiment, the lead wire 17 has the notches 12a and 13a formed in the terminals 12 and 13, respectively.
After passing through, the lead wires 17 are also soldered to the tips of the terminals 12 and 13 which are curved in a U shape, and therefore the lead wire 17 is also cut out.
It is bent into a V shape at the portions a and 13a. Therefore, the coating of the lead wire 17 is locked by the notches 12a and 13a, and even if an external force such as a tensile force acts on the lead wire 17, the force does not act on the soldering portion 18. Therefore, the reliability of the soldered portion 18 can be improved. Although the core of the lead wire 17 may be slightly displaced from the coating by an external force, the U-shaped portions of the terminals 12 and 13 are elastically deformed, and the displacement is absorbed and the soldered portion is absorbed. 18 is not affected.

Further, since the projecting portions of the terminals 12 and 13 and the soldering portion 18 are completely covered with the cap 21, it is possible to eliminate the influence from the outside. Moreover, since the terminals 12 and 13 are partitioned by the wall 15, it is possible to prevent a short circuit between the terminals due to metal powder or the like.

Further, as shown in FIGS. 7 and 8, the plate-like terminals 41 are fixed at right angles to both sides of the wall 15 of the sensor body 14, and the holes 41 and the notches 43 are formed in the terminals 41. Good. Then, the tip of the lead wire 17 is soldered to the hole 42, and the vicinity of the tip is locked to the notch 43.

According to this structure, the bending process of the terminal is not necessary and the process is facilitated. Since the lead wire 17 is covered with the cap 21, it does not escape to the outside.

[0019]

As described above, according to the present invention, the lead wire is guided to the U-shaped curved tip through the notch of the terminal of the temperature sensor and soldered, so that an external force is applied to the lead wire. Also, since no force acts on the soldered portion, the reliability of the soldered portion can be improved. Moreover, since one end of the sensor body of the temperature sensor is covered with the cap, it is possible to prevent external influences on the terminals and the soldered portions. Further, since the pair of terminals in the sensor body is partitioned by the wall, it is possible to prevent a short circuit due to metal powder or the like.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a configuration of an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view of the same.

FIG. 4 is a vertical sectional view showing a cap according to this embodiment.

FIG. 5 is a plan view of the same.

FIG. 6 is an explanatory diagram showing a state in which a temperature sensor according to this embodiment is attached to an oil passage.

FIG. 7 is a perspective view showing the configuration of another embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view of FIG.

FIG. 9 is a perspective view showing a conventional temperature sensor.

[Explanation of symbols]

 11 Thermistor 12, 13 Terminal 12a, 13a Notch 14 Sensor body 15 Wall 17 Lead wire 21 Cap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junji Fukushiro 1-7-1 Yokoi, Shimada City, Shizuoka Yazaki Keiki Co., Ltd. (56) References -67237 (JP, U)

Claims (2)

(57) [Scope of utility model registration request] 1. A thermistor is connected to both poles at one end of each of the terminals, the other end of the terminal is exposed to form a sensor body by resin insert molding, and the other end of each of the pair of terminals is provided with a lead wire. In a temperature sensor having its tip soldered, a wall for partitioning the pair of terminals is formed in the sensor body, and the exposed ends of these terminals are bent in a U shape, and the walls of these terminals are attached to the walls. A temperature sensor, characterized in that a notch portion for passing the lead wire is formed on opposite side surfaces. 2. The temperature sensor according to claim 1, wherein the sensor body is equipped with a cap that covers a connecting portion between the terminal and the lead wire.