JPH0623210U - Coil bobbin - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a thin coil bobbin that can firmly fix the coil lead wire to the flange part of the coil bobbin with a very simple structure without using pin terminals and obtain a compact and inexpensive molded coil. To do. A coil winding wire is provided around the tubular winding body portion, and a collar portion is provided at both ends of the winding body portion. A coil bobbin for resin molding, wherein one outer surface side of the collar portion is formed with a coil lead wire storage portion composed of coil lead wire fixing walls projecting in opposition to each other, and the fixing walls are mutually formed. A coil lead wire pressing portion is formed on at least one wall surface side of the facing wall surfaces to make the minimum distance between the facing wall surfaces smaller than the coil lead wire outer diameter, thereby forming a coil bobbin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coil bobbin suitable for a mold coil such as a solenoid coil which is often used for automobile parts and the like.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, a molded coil in which a required number of coil conductors such as an enameled wire are wound around a winding body of a coil bobbin and integrally molded with resin is often used for automobile parts and the like. In general, this coil bobbin is provided with a tubular winding barrel portion and flange portions at both ends thereof and is molded from synthetic resin. Further, in the manufacture of the molded coil, the coil lead wire end and the coil lead wire end were wound around and soldered to the pin terminals 10 planted in the collar portion 5 of the coil bobbin 1 as shown in FIG. In order to dispose the pin terminal 10 on the collar portion 5 of the coil bobbin 1, the pin terminal 10 is previously embedded and integrally molded when the coil bobbin 1 is resin molded, or the resin bobbin 1 is molded. The pin terminal 10 is press-fitted into the collar portion 5 or the like. Then, the coil after the terminal treatment of the coil conductor 9 and the coil lead 8 is resin-molded to form the molded coil 7.

[0003]

[Problems to be solved by the device]

 In the conventional coil bobbin, since the pin terminal is arranged in the coil bobbin collar portion, it is necessary to form the coil bobbin collar portion thick. As a result, the mold coil becomes large and expensive. In addition, since the coil lead wire was simply soldered to its terminal at the end, it was easy to move during resin molding, and the coil lead wire was exposed on the resin surface of the molded coil, which deteriorated the insulation characteristics.

In order to eliminate these difficulties, there is also a molded coil in which a coil lead wire terminal and a coil lead wire terminal are directly solder-connected without using a pin terminal. However, in this case, it is necessary to bond and fix the coil lead wire to the coil bobbin in order to prevent the coil lead wire from breaking and exposing the coil lead wire to the resin surface. -The disadvantage is that the field coil becomes expensive.

Further, in recent years, there has been an increasing demand for miniaturization and weight reduction of these molded coils, but in order to miniaturize the conventional coil bobbin in which the pin terminal is arranged on the collar portion, the coil bobbin needs to be thinned. Was needed. However, if the coil bobbin is made thinner, it becomes impossible to implant pin terminals, and the bobbin strength is reduced.

[0006] Therefore, if the resin molding thickness is made thinner to miniaturize the molded coil, there is a problem that the pin terminals and the coil lead wires are exposed on the surface of the resin and the insulation characteristics are deteriorated. However, it has been extremely difficult to manufacture molded coils that meet the demand for weight reduction.

It is an object of the present invention to provide a coil bobbin which can solve these problems without using pin terminals and is suitable for manufacturing a compact and inexpensive molded coil.

[0008]

[Means for Solving the Problems]

 A tubular winding body portion and flanges at both ends of the winding body portion are provided, and a coil wire is wound around the tubular winding body portion, and a coil lead wire is connected to the end of the coil conductor wire to integrally mold the resin. A coil bobbin for forming a coil lead wire accommodating portion composed of a coil lead wire fixing wall projecting to face each other on one outer surface side of the collar portion, and the fixing walls face each other. A coil lead wire pressing portion is provided on at least one wall surface side of the wall surface so as to make the minimum distance between the facing wall surfaces smaller than the outer diameter of the coil lead wire, thereby forming a coil bobbin. Further, it is preferable that the pressing portion is constituted by a protrusion having a wall surface for fixing the coil lead wire. Further, it is preferable that the wall surface for fixing the coil lead wire is formed in a wave shape.

[0009]

[Action]

 Use the pin terminal because the minimum distance between the opposing wall surfaces is smaller than the outer diameter of the coil lead wire, and the coil lead wire pushed into the coil lead wire housing is strongly pressed and fixed by the coil lead wire pressing part. Instead, it is possible to downsize the mold coil by thinning the coil bobbin.

[0010]

【Example】

 The present invention will be described below with reference to the drawings. 1 is an explanatory view of a coil in which a coil wire is wound around a coil bobbin of the present invention, and FIG. 2 is an explanatory view of a resin-molded molded coil. The coil bobbin 1 in the embodiment has a winding cylinder size of 10 mm square, a flange size of 30 mm square, and a winding cylinder length of 30 mm and is molded from polybutylene terephthalate (PBT) resin. On the outer surface side of the collar portion 5 of the coil bobbin 1, a pair of coil lead wire accommodating portions 2 and 2 are formed. The lead wire accommodating portion 2 is composed of a pair of coil lead wire fixing walls 3 and 3A which are provided so as to project toward the outer surface side of the collar portion 5 so as to face each other. Further, a plurality of protrusions each having a height of 0.5 mm are formed on each of the storage walls 3 and 3A to form a coil lead wire pressing portion 4. In the embodiment, the interval between the facing wall surfaces of the facing fixed walls 3 and 3A is set to 2.3 mm to 3.3 mm.

A required number of polyurethane copper wires (UEW) having a wire diameter of 0.5 mm are wound around the tubular winding body portion 11 of the coil bobbin 1 thus configured. Then, the core wire of each end of the coil lead wire 8 having an outer diameter of 3.0 mm and a rubber coating layer is exposed to a certain length, and the coil lead wires 8 are housed while being pressed into the lead wire housing portions 2 and 2. At this time, the minimum distance between the facing wall surfaces of the fixed walls 3 and 3A constituting the coil lead wire housing portion 2 is 2.3 mm, and the coil lead wires 8 are respectively formed by the protrusions of the coil lead wire pressing portion 4. The rubber coating layer is pressed and deformed to be housed in the coil lead wire housing portion 2 and is firmly fixed in the coil lead wire housing portion 2 by the elastic force of the rubber coating layer. Here, the terminal of each coil conductor 9 and the coil lead wire 8 whose core wire is exposed by peeling off the coating layer of each terminal are directly connected by soldering. When the terminal-treated coil is resin-molded with PBT resin, the coil lead wires 8, 8 are not exposed from the resin surface, and a compact molded coil 7 with a good molding state as shown in FIG. 2 is obtained. To be

FIG. 3 shows another embodiment of the present invention, and is an explanatory view of a coil using a coil bobbin in which the wall surface of the coil lead wire fixing wall is formed in a corrugated shape. In this coil bobbin 1, a wall surface of one fixed wall 3A of the pair of coil lead wire fixing walls 3 and 3A forming the coil lead wire housing 2 is formed in a corrugated shape, and the coil lead wire is formed by the corrugated wall surface. 8 is configured so that the convex portion of the corrugated wall surface presses and deforms the coating layer of the coil lead wire 8, and the coil lead wire 8 is housed and fixed in the coil lead wire housing part 2. It was done.

[0013]

[Effect of device]

 According to the coil bobbin of the present invention, the coil lead wire is firmly fixed to the flange portion of the coil bobbin with a very simple structure. As a result, disconnection of the coil conductor wire and exposure of the coil lead wire from the resin surface are prevented. Further, since the ends of the coil lead wire and the coil conducting wire can be connected to each other without using pin terminals and resin molding can be performed, the coil bobbin can be made thin, and a compact and inexpensive molded coil can be obtained. Further, there is an effect that a coil having uniform characteristics can be obtained.

[Brief description of drawings]

1A and 1B are views showing a coil according to an embodiment of the present invention, in which FIG. 1A is a plan view thereof, FIG. 1B is a front view thereof, and FIG. It is a cross-sectional view taken along the line A.

2A and 2B are views showing a mold coil in an embodiment of the present invention, FIG. 2A being a plan view thereof and FIG. 2B being a front view thereof.

3A and 3B are views showing a coil according to another embodiment of the present invention, in which FIG. 3A is a plan view thereof and FIG. 3B is a view thereof.
2 is a cross-sectional view taken along line AA of FIG.

4A and 4B are explanatory views of a coil using a conventional coil bobbin, in which FIG. 4A is a plan view thereof, FIG. 4B is a front view thereof, and FIG. 4C is A- of FIG. 4A. It is a sectional view taken along the line A.

[Explanation of symbols]

 1 Coil bobbin 2 Coil lead wire storage part 3, 3A Coil lead wire fixed wall 4 Coil lead wire pressing part 5 Collar part 7 Mold coil 8 Coil lead wire 9 Coil lead wire 11 Cylindrical winding body part

Claims (3)

[Scope of utility model registration request] 1. A tubular winding drum portion and flanges at both ends of the winding drum portion, wherein a coil conductor is wound around the cylindrical winding drum portion, and a coil lead wire is connected to the coil conductor wire terminal. A coil bobbin for resin-molding integrally, wherein a coil lead wire accommodating portion is formed on one outer surface side of the collar portion, the coil lead wire accommodating portion including a coil lead wire fixing wall projecting oppositely and the fixing wall. At least one wall surface side of the wall surfaces facing each other of
A coil bobbin pressing portion, wherein a coil lead wire pressing portion is formed to make a minimum interval between the facing wall surfaces smaller than the outer diameter of the coil lead wire. 2. The coil bobbin according to claim 1, wherein the pressing portion is a protrusion formed on a wall surface of the coil lead wire fixed. 3. The coil bobbin according to claim 1, wherein the wall surface of the coil lead wire fixing wall is formed in a wave shape.