JPH1172174A - Coil bobbin integral type sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts and costs by forming a body for a sensor of a position sensor and a coil bobbin for winding a coil integrally by a resin for molding on a stator. SOLUTION: A resin is overmolded on a stator 10 to fix an assembly body 12 made of the resin on the stator 10. When this assembly body 12 is molded and formed, a sensor terminal 14 is also molded at the same time. The assembly body 12 is formed by integrating a bobbin part 16 for winding a coil and a sensor body part 18. A coil is wound around the bobbin part 16 of the assembly body 12 from this condition. Consequently, it is possible to eliminate a necessity of a coil bobbin as a part and reduce costs owing to the reduction of the number of parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a coil bobbin integrated sensor in which a coin bobbin for winding a coil for driving a valve and a body of a sensor for detecting a valve position are integrally formed.

[0002]

2. Description of the Related Art Conventionally, in various valves, a coil bobbin around which a coil is wound, a stator, and a position sensor for detecting the position or opening of the valve are separately provided. It is fixed. Here, a conventional procedure for fixing the coil bobbin, the stator and the position sensor is shown in FIGS. As shown in FIG. 3, a coil bobbin 42 around which a coil 40 for generating a magnetic force is wound,
It is formed separately from the stator 44 that guides magnetic flux in a cylindrical shape.
Coil bobbin 42 wound with coil 40 and stator 4
4 are arranged in a predetermined positional relationship, and resin is over-molded from above to form a sensor body 46 of the position sensor.
Is formed (FIG. 4). The sensor body 46 connects and fixes the coil bobbin 42 and the stator 44, and
Cover the outer surface. Note that the sensor body 46 may not cover the outer surface of the coil 40. When molding the sensor body 46, the sensor terminal 48 is also molded at the same time.

As shown in FIG. 4, a concave portion 50 is formed in the upper surface of the sensor body 46, and a through hole 52 connecting the concave portion 50 and the internal space of the cylindrical stator 44 is formed.
To form The stator 44 is inserted into the recess 50 of the sensor body 46 through the element assembly 54 and the through hole 52.
Slider assembly 5 for projecting into the internal space of the vehicle
6. Attach a spring 58, etc., and then
To close the recess 50. The sensor body 46, the sensor terminal 48, the element assembly 54, the slider assembly 56, the spring 58, and the cap 60 constitute a sensor assembly.

[0004]

In the conventional apparatus for fixing the coil bobbin, the stator and the position sensor, the coil bobbin 42 around which the coil 40 is wound and the stator 44 are separated from each other, and a resin is used as a material from above. The sensor body 46 was overmolded. For this reason, two parts, the coil bobbin 42 and the stator 44, are required, which increases the cost. Further, when the sensor body 46 is molded, the positional relationship between the two components of the coil bobbin 42 and the stator 44 must be ensured accurately, and there is a possibility that the dimensions of the product may vary.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a coil bobbin integrated sensor that can reduce the number of parts and cost and improve the dimensional accuracy of a product.

[0006]

According to the present invention, in order to achieve the above object, a sensor body of a position sensor and a coil bobbin for winding a coil are integrally formed of a resin molded on a stator.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention in which a sensor body is molded on a stator. In the present invention, although a cylindrical stator 10 is used, a coil bobbin as a component is not used. The resin is overmolded on the stator 10, and the resin-made assembly body 12 is fixed to the stator 10. When the assembly body 12 is molded, the sensor terminals 14 are also molded at the same time. The assembly body 12 is formed by integrally forming a bobbin portion 16 for winding a coil and a sensor body portion 18. The sensor body 18 has a recess 20 formed in the upper portion, and a through hole 22 that connects the recess 20 to the internal space of the cylindrical stator 10.

[0008] From the state of FIG.
The coil 24 is wound around the bobbin part 16 (FIG. 2).
After winding the coil 24 around the bobbin portion 16, the coil 2
4, a coating member 26 for overmolding the resin is formed, and the coating member 26 covers the outer surface of the coil 24.
Note that, instead of the covering member 26, the outer surface of the coil 24 may be covered with a non-conductive tape. Next, the element assembly 2 is inserted into the recess 20 of the sensor body 18.
8, a slider assembly 30 for projecting through the through hole 22 into the internal space of the stator 10, a spring 3
Then, the recess 20 is closed with the cap 34. The sensor body portion 18, the sensor terminal 14,
The element assembly 28, the slider assembly 30, the spring 32, and the cap 34 constitute a sensor assembly. As described above, in the present invention, the bobbin portion 16 around which the coil 24 is wound and the sensor body portion 18 which is a component of the sensor assembly are formed as an integrated assembly body 12.

[0009]

As described above, the coil bobbin integrated sensor according to the present invention is such that the sensor body and the coil bobbin are formed as an integral assembly body, and the coil bobbin as a conventionally required component is not required. The cost can be reduced by reducing the number of parts. Further, as compared with the conventional mold for the stator and the coil bobbin, the present invention is a mold for only the stator, so that the present invention can improve the dimensional accuracy of the product as compared with the conventional.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the present invention showing a state in which a sensor body is molded on a stator.

FIG. 2 is a sectional view showing a coil bobbin integrated sensor according to the present invention.

FIG. 3 is an exploded sectional view showing a conventional stator and coil.

FIG. 4 is a cross-sectional view showing a state where the sensor assembly is molded on the stator and the coil of FIG. 3;

FIG. 5 is a cross-sectional view showing a state where the components of the sensor assembly are assembled into the state shown in FIG. 4;

[Description of sign]

 DESCRIPTION OF SYMBOLS 10 Stator 12 Assembly body 16 Bobbin part 16 18 Sensor body part 24 Coil

Claims (1)

[Claims] 1. A coil bobbin integrated sensor, wherein a body of the sensor and a coil bobbin for winding a coil are integrally formed of a resin molded on a stator.