JPH11351974A - Structure of temperature detecting sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an engagement part from disengaging off an attached member by comprising a regulation surface which regulates deformation behavior of an elastic arm at the engagement part provided on an outer wall of a resin case, so that the elasticity of the elastic arm is exhibited when the engagement part, provided with a detent function, engages with the attached member. SOLUTION: A resin case comprises, for example, a nylon resin, with one end of a temperature-sensitive element, a parallel twin-lead wire, and a terminal insert-molded while the other end of the terminal is exposed to form a connector part, with an engagement part 3 integrally formed on an outer wall. Related to the resin case, the thickness of a mold resin at a peripheral part of the temperature-sensitive element is adjusted with a recess amount at molding of a mold. The engagement part 3 is anchor-shaped, forming a regulation surface 3p together with an elastic arm 3a. The regulation surface 3b regulates the deformation behavior of the elastic arm 3a. When, for example, the engagement part 3 fitted with an attached member 7 is applied with a rotational torque, the elastic arm 3a hits the regulation surface 3b to stop the rotation of the engagement part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a temperature detecting sensor insert-molded with a resin.

[0002]

2. Description of the Related Art Conventionally, assuming that a temperature detection sensor is sealed in a resin case, for example, as shown in Japanese Utility Model Application Laid-Open No. 4-24032, a case is formed in advance and resin is poured into this case. There was one in which the temperature sensing element was sealed. This case has an anchor-shaped locking portion on the outer wall, and the temperature detecting sensor is fixed to the mounting member by inserting the locking portion into a through hole of the mounting member and elastically fitting the same.

[0003]

However, in the case of the above-mentioned prior art, a step of sealing the temperature sensing element with a resin is required in addition to the step of molding the case, and much time is required for sealing the resin. Was required. In this regard, if the temperature sensing element is insert-molded simultaneously with the molding of the case, the number of steps can be reduced. However, in order to dispose the temperature sensing element at a predetermined position in the case, it is necessary to perform an injection molding process, for example, by supporting the temperature sensing element with a positioning pin and removing the pin after completion of the molding. For this reason, a trace of the pin remains in the case, and there is a problem that water enters into the case from the trace. Therefore, it is necessary to use the pin for a limited use or to fill in the trace.

Further, in the prior art, it was not easy to change the thickness of the resin around the temperature sensing element and variously set the thermal response of the temperature sensing element.

Further, in the prior art, when the temperature detection sensor was fixed to the mounting member, it was necessary to provide a rotation preventing member. In the embodiment shown in FIGS. 1 to 3 of Japanese Utility Model Application Laid-Open No. 4-24032, a through-hole to be fitted to the projection is provided in the case or the mounting member. In the case of the embodiment shown in FIG. 4 of Japanese Utility Model Application Laid-Open No. 4-24032, since a protrusion is formed at the base of the locking portion, it is necessary to provide an extra through-hole or a protruding portion in the mounting member or the case. Instead, the elastic force of the elastic arm cannot be fully exerted when the locking portion engages with the mounting member, and there is a problem that rattling occurs.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to address the above-described problems, and has various advantages in that the thermal responsiveness of a temperature sensing element can be variously set without leaving a trace of a pin after molding. A mounting member, comprising: a sensing element; a resin case in which the temperature sensing element is insert-molded; and an anchor-shaped locking portion provided on an outer wall of the resin case and having a regulating surface for regulating a deformation operation of the elastic arm. A temperature sensing element and a resin case in which the temperature sensing element is insert-molded in order to achieve the purpose of exerting the elastic force of the elastic arm when the locking portion has the function of preventing rotation with respect to And an anchor-shaped locking portion provided on an outer wall of the resin case and having a regulating surface for regulating a deformation operation of the elastic arm.

[0007]

FIG. 1 is a partially cutaway perspective view showing a preferred embodiment of the present invention. In the figure, 1 is a temperature sensing element, 2 is a resin case, and 3 is a locking portion. Hereinafter, each of the above configurations will be described in detail.

First, the temperature sensing element 1 is, for example, a thermistor, and is connected to a terminal 5 by a parallel two-core wire 4.
The parallel two-core wire 4 is formed by arranging two lead wires 4a in parallel at a predetermined interval and applying a coating 4b to make them integral with each other. It has a certain degree of rigidity against external forces. The terminal 5 has a connection portion 5a for the lead wire 4a and a positioning projection 5b for fixing the terminal 5 to a molding die 6.

The resin case 2 is made of, for example, a nylon resin. The temperature sensing element 1, the parallel two-core wire 4, and one end of the terminal 5 are insert-molded, and the other end of the terminal 5 is exposed to form a connector portion 2a. And the locking part 3 on the outer wall
Are integrally formed. In the resin case 2, the thickness of the molding resin in the peripheral portion 2 b of the temperature sensing element 1 is adjusted by the amount of retreat during molding of the molding die 6.

The locking portion 3 has an anchor shape as shown in FIG. 2, and has an elastic arm 3a and a regulating surface 3b. The restricting surface 3b restricts the deformation operation of the elastic arm 3a. For example, when a rotational torque is applied in the direction of arrow A in FIG. 3
a contacts the regulating surface 3b, and stops the rotation of the locking portion 3.

Next, using the molding die 6, the temperature sensing element 1 is used.
Will be described step by step in the step of insert molding the resin into the resin case 2. (1) First Step: FIG. 4 shows the first step, in which the temperature sensing element 1 is supported by the slide block 6c of the molding die 6. This molding die 6 includes a lower die 6a,
The slide block 6c includes an upper die 6b, a slide block 6c, and a spring 6f. The slide block 6c further includes a first support 6d for the positioning protrusion 5b and a second support 6e for the temperature sensing element 1. To set the temperature sensing element 1 on the molding die 6, first insert the terminal 5 into the lower die 6a, and then put the upper die 6b on the lower die 6a. At this time, the terminal 5 is connected to the first support portion 6 of the lower mold 6a and the slide block 6c.
d, the temperature sensing element 1 is pressed against the second support portion 6e of the slide block 6c and supported by the rigidity of the parallel two-core wire 4.

(2) Second step: FIG. 5 shows a second step following the first step, and shows a state in which the slide block 6c is retracted by the injection pressure of the molten molding resin 2 '. The molten molding resin 2 ′ is injected under pressure through a gate (not shown) into a space in a molding die 6 in which the temperature sensing element 1 is set. This pressure is called an injection pressure. The molding resin 2 ′ injected under pressure flows in the directions indicated by arrows B and C in FIG. 5, and the injection pressure eventually acts on the slide block 6c, and the slide block 6c moves backward in the direction indicated by the arrow D in FIG. I do. As a result, the second support portion 6e of the slide block 6c moves from the P position shown in FIG.
The melted molding resin 2 'flows into this position and flows into this portion. After the above steps, if the molding die 6 is cooled, the temperature detection sensor shown in FIG. 1 is completed.

When it is desired to change the thickness of the molding resin in the peripheral portion 2b of the temperature sensing element 1, the slide block 6c can be replaced or the retreat amount of the slide block 6c can be changed by using an adjustment mechanism (not shown). Good.

[0014]

According to the present invention, since the locking portion has the restricting surface for restricting the deformation operation of the elastic arm, when the locking portion engages with the mounting member with the function of preventing rotation, the elastic portion is elastic. The elastic force of the arm can be exerted, and the locking portion does not fall off the mounting member.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a preferred embodiment of the present invention.

FIG. 2 is an enlarged view of a locking portion shown in FIG.

FIG. 3 is a sectional view taken along line EE in FIG. 2;

FIG. 4 is a cross-sectional view showing a first step of molding the one shown in FIG.

FIG. 5 is a sectional view showing a second step of molding the one shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Temperature sensing element 2 Resin case 3 Locking part 4 Parallel two-core wire 5 Terminal 6 Molding die 3a Elastic arm 3b Regulation surface 6c Slide block

Claims (1)

[Claims] 1. A temperature sensing element, a resin case in which the temperature sensing element is insert-molded, and an anchor-shaped locking portion provided on an outer wall of the resin case and having a regulating surface for regulating a deformation operation of an elastic arm. The structure of the temperature detection sensor comprising: