JPH0536330U - Temperature sensor - Google Patents

Abstract

(57) [Summary] [Object] To provide a temperature sensor capable of improving the reliability of a soldered portion even when an external force is applied to a lead wire soldered to a terminal of a sensor body. [Structure] One end of each of the terminals 2 and 3 is connected to both poles of the thermistor 1, and the other end of each of the terminals 2 and 3 is exposed to form a sensor main body 4 by resin insert molding. In the temperature sensor in which the ends of the lead wires 5 and 6 are soldered to the other ends of the bent portions 3, the bent portion 10 in which the lead wires 5 and 6 are fitted to one surface of the sensor body 4
Grooves 10 and 11 having a and 10b are formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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]

[Prior 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 ends 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 ends of the terminals 2 and 3 protrude from the sensor body 4, and the protruding ends of the terminals 2 and 3 are soldered to the metal portions at the ends of the lead wires 5 and 6, 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 covered and protected by heat-shrinkable tubes 8 and 9, respectively.

[0003]

[Problems to be solved by the device]

 However, according to the conventional temperature sensor configured 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. There was a risk that the reliability of soldering would decrease.

Further, when the heat shrinkable tubes 8 and 9 are assembled to the soldering portion 7, heat shrinkage must be performed, workability is poor, and the tube material must be heat and oil resistant. There was a problem of high cost.

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. In addition, there was a problem that the function of the sensor could not be fulfilled due to the short circuit between the electrodes due to the 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 improved even when an external force is applied to the lead wire soldered to the terminal of the sensor body. Moreover, it is an object of the present invention to provide a temperature sensor capable of preventing a short circuit between electrodes.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention connects one end of each terminal to both poles of a thermistor, exposes the other end of the terminal to form a sensor main body by resin insert molding, and comprises the pair of terminals. In the temperature sensor in which the tip ends of the lead wires are soldered to the other ends of the above, a groove having a bent portion into which the lead wires fit is formed on one surface of the sensor body.

[0008]

[Action]

 According to the above configuration, even if a pulling force is applied to the lead wire, that force is received by the bent portion of the groove formed in the sensor body, so that no force is applied to the soldered portion. Further, since the cap completely covers the terminals protruding from the sensor body, the soldered parts, and the metal parts of the lead wires, this connection part is not affected by the outside and the assembly is easy.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention. In these figures, portions corresponding to those of the conventional example shown in FIG. 9 are designated by the same reference numerals, and description thereof will be omitted as appropriate. The feature of this embodiment is that the bottom surface of the sensor body 4 is formed with grooves 10 and 11 having substantially the same cross section as that of the lead wires 5 and 6 and having bent portions 10a and 11a penetrating between opposite sides. is there. Lead wires 5, 6 each having one end soldered to the protruding ends of the pair of terminals 2, 3 are fitted and held in the grooves 10, 11, respectively. Further, the soldering portion 7 may be protected by coating the heat shrinkable tubes 8 and 9 as in the conventional example shown in FIG. 8, but the cap 12 as shown in FIGS. It is preferably mounted on the main body 4.

The cap 12 is formed of a synthetic resin in a box shape with one end open, and the opening of the cap 12 is fitted to the step 13 formed on the outer periphery of the sensor body 4 on the protruding side of the terminal. Thus, the sensor body 4 is mounted. A fitting groove 14 is formed on the end surface of the cap 12 facing the opening, and the fitting groove 14 is fitted with a bracket 15 mounted on the engine side to prevent the bracket 15 from falling off. Further, fitting grooves 16 are formed on both side surfaces of the sensor body 4, and a bracket 17 as shown in FIG. 6 is attached. That is, a pair of arms 17b are integrally formed by bending at right angles on both sides of the bottom surface 17a of the bracket 17, and the arms 17b fit into the fitting groove 16 and the step portion 13 of the sensor body 4. Thus, the sensor body 4 is held and fixed to the bracket 17. Further, the lead wires 5 and 6 fitted into the grooves 10 and 11 of the sensor body 4 are pressed by the bottom surface 17a of the bracket 17, and the lead wires 5 and 6 are securely fixed to the sensor body 4. Further, the sensor body 4 is fixed to the engine side via the bracket 17.

On the other hand, a wall 18 is provided in the center of the inner surface of the cap 12 in parallel with the insertion direction, and when the cap 12 is mounted on the sensor body 4, the wall 18 prevents the protruding portions of the terminals 2 and 3 from protruding. Completely partitioned.

As shown in FIG. 7, a wall 19 may be provided between the terminals 2 and 3 of the sensor body 4, and a groove 20 into which the wall 19 fits may be formed on the inner surface of the cap 12.

According to this embodiment, even if an external force such as a pulling force is applied to the lead wires 5 and 6, the force is received by the bent portions 10a and 11a of the grooves 10 and 11 formed in the sensor body 4. Therefore, no force is applied to the soldering portion 7. As a result, the soldered portion 7 is not damaged, and the reliability of electrical connection can be improved.

Further, the cap 12 is easy to mount on the sensor body 4 and completely covers the connecting portions of the protruding terminals 2 and 3 and the lead wires 5 and 6, so that these connecting portions can be handled from the outside. Is not affected by. Furthermore, since the terminals 2 and 3 are partitioned by the walls 18 and 19, it is possible to prevent a short circuit between the electrodes due to adhesion of iron powder or the like.

Further, as shown in FIG. 8, locking protrusions 31 are formed on both side surfaces of the sensor body 4, and locking holes 32 are formed through both side walls of the cap 12 to form the protrusions 31. The sensor body and the cap 12 may be integrally held by engaging with the hole 32. Reference numeral 33 is a groove formed on both side surfaces of the cap 12 for attachment to an engine such as a mission.

With this structure, the bracket 17 shown in FIG. 6 can be eliminated.

[0018]

[Effect of the device]

 As described above, according to the present invention, since the groove having the bent portion into which the lead wire fits is formed on one surface of the temperature sensor body, even if an external force is applied to the lead wire, no force is applied to the soldered portion. Therefore, the reliability of the soldered portion can be improved.

[Brief description of drawings]

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

FIG. 2 is a side view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a plan view showing the structure of the cap.

FIG. 5 is a side view of the same.

FIG. 6 is a perspective view showing a bracket that supports the sensor body.

FIG. 7 is an explanatory view showing a wall according to another embodiment of the present invention.

FIG. 8 is a perspective view showing a configuration of still another embodiment of the present invention.

FIG. 9 is a perspective view showing an example of a conventional temperature sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Thermistor 2, 3 ... Terminal 4 ... Sensor main body 5, 6 ... Lead wire 10, 11 ... Groove 10a, 11a ... Bending part 12 ... Cap

Front Page Continuation (72) Ken Ken Asami, Toyota City, Toyota City, Aichi Prefecture 1 Toyota Motor Co., Ltd. (72) Inventor, Nobuaki Miki 10 Takane, Fujii Town, Anjo City, Aichi Aisin A / D Abriyu Co., Ltd. (72) Inventor Toshiya Morishita 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aisin A-Daburi Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A sensor body is formed by connecting one end of each of the terminals to both poles of a thermistor, exposing the other end of the terminal, and insert-molding the resin into a sensor main body. A temperature sensor having a soldered tip, wherein a groove having a bent portion into which the lead wire fits is formed on one surface of the sensor body.