JP3551298B2 - Solenoid coil body - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coil body of a solenoid, and more particularly, to a coil body manufactured by an insert molding method.
[0002]
[Prior art]
The coil body of the solenoid is configured, for example, as shown in a sectional view in FIG. 7. The coil body 1 is an insert body comprising a bobbin 3 around which a coil 2 is wound, a magnetic yoke 4, and a rubber grommet 6 for protecting a lead wire 5. Embedded in the synthetic resin 7. Although not shown, a movable iron core or a fixed iron core is usually provided in the hollow portion of the bobbin 3, and controls to determine an axial position of the movable iron core and the like according to a state of energization of the coil 2.
[0003]
Such a coil body 1 is usually integrally molded by injection molding or compression molding. In the case of injection molding, a brief description of the molding method is as follows, for example, as shown in FIG. The bobbin 3 and the magnetic yoke 4 are set on the setting projection 100a of the lower mold 100, and the rubber grommet 6 through which the lead wire 5 is inserted is set in the accommodating recess 101a of the top 101, and the upper mold 102 and the lower The mold 100 is clamped, a resin material is injected from the gate 103 and pressurized. After the resin material is cured, the mold is opened and a molded product is taken out.
[0004]
[Problems to be solved by the invention]
However, according to the conventional coil body 1, at the time of molding, the tip 6b of the main body 6a of the rubber grommet 6 is crushed by receiving the molding pressure P, and bites into the lead wire 5 softened by the mold temperature. Was sometimes disconnected.
[0005]
9A and 9B, that is, a coil body of a type in which a back surface 6d of a flange 6c of a rubber grommet 6 is exposed to the outside. In FIG. 1, at the time of molding, the rubber grommet 6 is set in the accommodating concave portion 101a of the top 101 as shown in FIG. 10, and when the rubber grommet 6 receives the molding pressure P, the rubber grommet 6 is compressed as shown in FIG. In this state, the coil body 1 is integrally formed, and when the compressed state of the main body 6a is released when the mold is subsequently opened, the elastic return force causes the connection between the main body 6a and the flange 6c to be formed as shown in FIG. In some cases, a crack 6e as shown in FIG. 11B or a tip 6b of the main body 6a protrudes as shown in FIG. Also, during insert molding, the main body 6a is compressed in the direction of the molding pressure P, and the vicinity of the connection portion of the main body 6a with the flange 6c is displaced in the direction of the molding pressure P, whereas the back surface 6d of the flange 6c is displaced in the direction of the molding pressure P. Is received by the end face 101b of the top 101, and the vicinity of the connection portion with the main body portion 6a in the flange portion 6c is not displaced in the direction of the molding pressure P, so that a crack 6e is generated at the connection portion between the main body portion 6a and the flange portion 6c. In addition, the distal end 6b of the main body 6c may protrude to cause poor appearance.
[0006]
An object of the present invention is to solve the above-described problems of the conventional coil body and to provide a coil body that can prevent disconnection of a lead wire during molding and defective appearance of a rubber grommet. Things.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a coil of the solenoid according to the present invention, in the coil of the solenoid with a rubber grommet comprising a body portion and a flange portion, deformation of the main body portion by molding pressure during insert molding the coil body A deformation relief mechanism is provided in the main body part for releasing the air, and the deformation relief mechanism is configured by an outer side part having an outer diameter set to be smaller than an outer diameter of a coil side part of an outer peripheral part of the main body part. It is characterized by the following.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 shows a configuration of a rubber grommet of a coil body according to one embodiment, FIG. 1 (A) is a front view thereof, and FIG. 1 (B) is a sectional view taken along the line BB of FIG. 1 (A). The other configuration of the coil body is the same as that of the coil body 1 shown in FIG.
[0013]
In FIG. 1, the rubber grommet 6 includes a main body 6a and a flange 6c, and has two lead wire insertion holes 6f through which the two lead wires 5 are inserted from the main body 6a to the flange 6c.
[0014]
Each lead wire insertion hole 6f has a different diameter between a portion 6g (referred to as a coil side portion) located on the side of the coil 2 (FIGS. 7 and 8) and a portion 6h (referred to as an external side portion) located on the outer side. The diameter of the coil-side portion 6g is set substantially equal to the outer diameter of the lead wire 5, while the diameter of the outer-side portion 6h is set larger than the diameter of the coil-side portion 6g.
[0015]
By forming the lead wire insertion hole 6f in this way, as shown in FIG. 2, when the rubber grommet 6 is set on the top 101 and insert molding of the coil body 1 is performed, the main body 6a deformed by receiving the molding pressure P. Can escape into the space formed by the outer peripheral surface of the lead wire 5 and the inner peripheral surface of the outer portion 6h of the lead wire insertion hole 6f. Therefore, the problem of the conventional coil body 1 in which the distal end portion 6b of the main body portion 6a bites into the lead wire 5 and breaks the lead wire 5 is solved.
[0016]
Accordingly, the lead wire insertion hole 6f functions as a deformation relief mechanism for relieving the deformation of the main body 6a of the rubber grommet 6 due to the molding pressure P when insert molding the coil body 1.
[0017]
3 shows a rubber grommet according to another embodiment in which a deformation relief mechanism is provided in a lead wire insertion hole, as in the above, FIG. 3 (A) is a front view thereof, and FIG. 3 (B) is FIG. 3 (A). The illustration BB sectional drawing is shown.
[0018]
The lead wire insertion hole 6f of the rubber grommet 6 shown in FIG. 3 is formed as a single hole 6i through which each lead wire 5 is independently inserted at the coil side portion, while two lead wires are formed at the outer side portion. 5 are formed as common holes 6j which are inserted at the same time.
[0019]
Also in the case of such a lead wire insertion hole 6f, the distal end portion 6b of the main body 6a that is deformed by receiving the molding pressure is formed between the outer peripheral surface of the two lead wires 5 and the common hole 6j of the lead wire insertion hole 6f. It is possible to escape into the space formed by the peripheral surface and to prevent disconnection of the lead wire 5 as in the embodiment of FIG.
[0020]
FIG. 4 shows a configuration of a rubber grommet according to still another embodiment, FIG. 4 (A) is a front view thereof, and FIG. 4 (B) is a sectional view taken along line BB of FIG. 4 (A). The rubber grommet 6 is characterized by the shape of the outer peripheral portion of the main body 6a, and the outer diameter of the outer side portion 6k of the outer peripheral portion is set smaller than the outer diameter of the coil side portion 6l.
[0021]
Even when the outer peripheral portion of the main body 6a is formed as described above, the tip 6b of the main body 6a that is deformed by receiving the molding pressure P when performing the insert molding of the coil body 1 is formed by the outer peripheral portion of the main body 6. Can escape into the space formed by the outer peripheral surface of the outer side portion 6k and the inner peripheral surface of the accommodating concave portion 101a of the top 101, thereby solving the problem that the distal end portion 6b of the main body portion 6a cuts into the lead wire 5 and breaks. be able to.
[0022]
Therefore, the outer peripheral portions 6k and 6l of the main body 6a function as a deformation relief mechanism for relieving the deformation of the main body 6a of the rubber grommet 6 due to the molding pressure P when insert-molding the coil body 1.
[0023]
The locations where the deformation relief mechanisms 6h and 6k are formed are not limited to only the outer periphery of the lead wire insertion hole 6f or the main body 6a as described above, but the outer periphery of the lead wire insertion hole 6f and the main body 6a. In this case, a groove may be formed along the circumferential direction. Furthermore, the outer diameter of the outer part 6h of the lead wire insertion hole 6f and the outer diameter of the outer part of the outer peripheral part 6k of the main body 6a do not have to be uniform over the entire circumference. Along the grooves may be provided at appropriate intervals in the circumferential direction so that the tip 6b of the main body 6a can escape into the space formed by the adjacent grooves during molding.
[0024]
FIG. 5 shows a configuration of a main part of a coil body according to still another embodiment at the time of insert molding. The rubber grommet 6 of the coil body 1 is of the same type as the rubber grommet 6 inserted into the coil body 1 of the type shown in FIG. 9, and the outer diameter of the main body 6a is provided at the center of the end face 6m of the flange 6c. A concave portion 6n having a larger diameter is formed. A relatively thin backing plate 8 is bonded to the end face 6m of the flange 6c. The backing plate 8 is made of a relatively soft synthetic resin plate that does not damage the lead wire 5, for example, a phenol resin plate.
[0025]
In this manner, by forming the concave portion 6n in the flange portion 6c of the rubber grommet 6 and abutting the contact plate 8 on the end surface 6m of the flange portion, the molding pressure P applied to the contact plate 8 when the coil body 1 is insert-molded. Is transmitted to only the portion of the entire flange end face 6m that is in contact with the backing plate 8, and is received by the end face 101b of the top 101 that is in contact with the back surface 6d of the flange 6c. The molding pressure P is hardly transmitted to the main body 6a. In other words, the concave portion 6l of the flange portion 6c and the backing plate 8 function as a pressure blocking portion for preventing the molding pressure P from being directly transmitted to the main body portion 6a of the rubber grommet 6 when insert-molding the coil body 1.
[0026]
Since the main body 6a hardly receives the molding pressure P, the degree of compression of the main body 6a due to the molding pressure P is extremely small. For this reason, when the mold is opened, even if the compressed state of the main body 6a is released, its elastic return force is small, and a crack 6e is formed at the connection point between the main body 6a and the flange 6c (FIG. 11B). And the tip 6b of the main body 6a protruding (FIG. 11B) can be prevented. Also, at the time of insert molding, since the degree of compression of the main body 6a due to the molding pressure P becomes extremely small as described above, a crack 6e is generated at a connection portion between the main body 6a and the flange 6c or the main body 6a is It is possible to prevent the tip 6b from projecting.
[0027]
FIG. 6 shows a modification of the embodiment shown in FIG. 6, the rubber grommet 6 does not have the recess 6n like the rubber grommet 6 shown in FIG. 5, and has the same shape as the rubber grommet 6 shown in FIG. On the other hand, the backing plate 8 bonded to the flange end surface 6m of the rubber grommet 6 is different from the flat backing plate 8 shown in FIG. 5 in that the main body 6a of the rubber grommet 6 is provided at the center of the end surface 8a in contact with the flange portion 6c. A concave portion 8b having a diameter larger than the outer diameter of is formed.
[0028]
Even with such a configuration, the concave portion 8b functions as a pressure interrupting portion for preventing the molding pressure P from being directly transmitted to the main body portion 6a of the rubber grommet 6 when insert-molding the coil body 1, and the mold is formed. At the time of opening, even if the compressed state of the main body 6a is released, the elastic restoring force is reduced, and a crack 6e (FIG. 11B) is generated at the connection portion between the main body 6a and the flange 6c, or the main body 6a (FIG. 11B) can be prevented. In addition, even at the time of insert molding, it is possible to prevent a crack 6e from being generated at a connection portion between the main body 6a and the flange 6c, and prevent the tip 6b of the main body 6a from protruding.
[0029]
【The invention's effect】
The coil body of the solenoid according to the present invention is characterized in that a rubber grommet is provided with a deformation relief mechanism for releasing deformation of the main body of the rubber grommet due to molding pressure when insert molding the coil body. The problem that the main body of the above-mentioned body bites into the lead wire and breaks can be solved.
[Brief description of the drawings]
1A and 1B show a configuration of a rubber grommet of a coil body according to an embodiment of the present invention, FIG. 1A is a front view thereof, and FIG. 1B is a sectional view taken along a line BB of FIG. 1A. .
FIG. 2 is an explanatory diagram for explaining an operation of the rubber grommet shown in FIG. 1;
FIG. 3 shows a rubber grommet according to another embodiment, FIG. 3 (A) is a front view thereof, and FIG. 3 (B) is a sectional view taken along the line BB in FIG. 3 (A).
FIG. 4 shows a rubber grommet according to still another embodiment, FIG. 4 (A) is a front view thereof, and FIG. 4 (B) is a sectional view taken along the line BB of FIG. 4 (A).
FIG. 5 is a configuration diagram at the time of insert molding of a main part of a coil body according to still another embodiment.
FIG. 6 is a configuration diagram at the time of insert molding of a modified example of the embodiment shown in FIG. 5;
FIG. 7 is a sectional view of a conventional coil body.
FIG. 8 is a cross-sectional view for explaining a method of insert-molding the coil body shown in FIG.
9A and 9B show a configuration of a main part of another conventional coil body, FIG. 9A is a front view thereof, and FIG. 9B is a sectional view taken along the line BB of FIG. 9A.
10 is a configuration diagram of a main part of the coil body shown in FIG. 9 at the time of insert molding.
11A and 11B are explanatory views for explaining a problem of a main part of the coil body shown in FIG. 9; FIG. 11A is a cross-sectional view during insert molding, and FIG. FIG.
[Explanation of symbols]
1 Coil body 6 Rubber grommet 6a Main body 6c Flange 6f Lead wire insertion holes 6h, 6j External part of lead wire insertion hole (deformation relief mechanism)
6k External part of outer periphery of main body (deformation relief mechanism)
6m Flange end face 6n recess (pressure cut-off part)
8 Backing plate 8b Recess (pressure cut-off part)

Claims (1)

In a solenoid coil body having a rubber grommet including a main body and a flange,
The deformation relief mechanism for miss deformation of the main body portion by molding pressure during insert molding the coil body provided in the main body portion, said alteration form relief mechanism, than the outer diameter of the coil end section of the outer peripheral portion of said main body portion A coil body of a solenoid, characterized in that the coil body is also constituted by an external portion having a small outer diameter .

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