JPS6028099Y2 - electric coil device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electrical coils, and more particularly to a ground terminal connection for an electrical coil that has a metal or conductive casing and uses the casing as a ground.

For example, a solenoid, which is a driving source for various electromagnetic actuators, is mounted inside a metal casing.

In this type of electric coil, one wire of the electric coil is connected to the casing and grounded in order to reduce the number of wires in automobiles and the like.

In other words, when there is only one electric coil, only one wire is pulled out and connected to a switch or the like, and the casing is fixed to the vehicle body with bolts or the like to make a ground connection.

Therefore, when making this type of electric coil device, one wire (ground) of the electric coil must be electrically connected to the casing in advance.

Conventionally, this connection was made by wrapping insulating tape around the ends of the wires to prevent them from coming into contact with other parts, and by screwing or caulking the ends of the wires to the casing.

However, the insulating tape is easily deteriorated by vibration, temperature, etc., and it is labor-intensive, resulting in poor workability.

The first purpose of the present invention is to provide an electric coil device that is easy to connect to the ground and has less variation in quality, and the second purpose is to provide an electric coil device that has less deterioration in quality due to changes over time. do.

In order to achieve the above object, in the present invention, a conductive elastic protrusion extending to the casing is formed on the grounding terminal, and the protrusion and the casing are electrically connected by caulking or the like.

According to this, the connection work is easy because the protrusion does not move like a wire, and the elasticity of the protrusion keeps the ground terminal of the electric coil and the casing in pressure contact at all times, ensuring a sufficient electrical connection for a long period of time. Can be maintained.

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

FIG. 1 shows an exploded perspective view of an electric coil device according to one embodiment, and FIG. 2 shows a part of the completed electric coil device.

This will be explained with reference to FIGS. 1 and 2.

1 is the coil bobbin, with a hole drilled in the center.

2 is an electric coil wound around the coil bobbin 1.

The head 1a (flange portion) of the coil bobbin 1 has sockets 1b and 1c spaced in the shape of a cross.

3 and 4 are terminals. Terminals 3 and 4 are adapted to fit into sockets 1b and 1C, respectively.

A plan view, a front view, and a right side view of the terminal 3 are shown in FIGS. 3a, 3b, and 3c.

This will be explained with reference to FIGS. 3a, 3b and 3c.

To explain briefly, the terminal 3 is made up of two elastic metal plates 3.
A and 3b are overlapped and fixed by spot welding at points P1 and P2.

The metal plate 3a is relatively thick, and the metal plate 3b is relatively thin.

A part of the head HE of the metal plate 3a is made thin in order to wind the lead wire from the electric coil 2, and two legs LE are formed at the base.

The tips of the two legs LE have projections for engagement with the socket 1b.

The metal plate 3b is bent at right angles at four points Pa, Pb, Pc and Pd.

The distance between the portion from pb to Pc of the metal plate 3b and the metal plate 3a is slightly smaller than the thickness of the socket 1b.

Also, the part beyond Pd is slightly inclined.

Note that the terminal 4 has the same shape as the metal plate 3a of the terminal 3.

Referring again to FIGS. 1 and 2, assembly of the electric coil device will be described.

When the legs LE of the terminals 3 and 4 are inserted into the sockets 1b and 1c, the projections at the ends of the legs LE engage with the sockets 1b and 1c due to the elasticity of the legs LE, and the terminals 3 and 4 are fixed.

In addition, since the terminal 3 has a step smaller than the plate thickness of the socket 1b, the socket 1 is formed by the metal plates 3a and 3b.
It is also fixed by the force that pinches b.

When the terminal 3 is attached to the socket 1b, the metal plate 3b extends in the circumferential direction of the coil bobbin 1, and its tip extends slightly outside the collar 1a of the coil bobbin.

Lead wires 5 and 6 drawn out from the electric coil 2 are connected to the second
As shown in the figure, they are wrapped around the narrowed portions of terminals 3 and 4 and soldered.

An end plate 7 made of a magnetic material is attached thereon, and the assembly is placed in a metal casing 8.

When the head 8a of the casing 8 is caulked together with the tip of the metal plate 3b, the metal plate 3b, that is, the terminal 3, and the casing 8 come into electrical contact.An electric coil device with the casing 8 as the ground as shown in FIG. It's done.

4a and 4b show a solenoid valve constructed using the electric coil device of FIG. 2.

This will be explained with reference to FIGS. 4a and 4b.

A core 9 is inserted and fixed inside the coil bobbin 1, and a plunger 11 is connected to one end of the core 9 via a compression coil spring 10.

The tip 11a of the plunger 11 is a valve, which is arranged in the flow path 12.

13 is a fluid inlet, and 14 is a fluid outlet.

15, 16 and 17 are O-rings.

The metal plate 3b is connected to the metal flange 1 via the casing 8.
It is electrically connected to 8.

A lead wire 19 is drawn out from the terminal 4, and a connector 20 is connected to the tip of the lead wire 19.

A rubber cover 21 is attached to one end of the casing 8, and a resin 22 is filled in the cover 21.

In the above embodiment, the terminal 3 is connected to two metal plates 3a and 3.
(b) is fixed, but if the thickness of both can be made equal, it may be constructed from a single metal plate.

Further, in the embodiment, only the tip of the metal plate 3b and the casing 8 are caulked together, but if necessary, spot welding or the like may be performed.

However, for general purposes, welding is sufficient.

Note that the metal plate 3b and the casing 8 may be caulked by press caulking or roll caulking.

Note that, as the casing 8, a steel pipe can be used, for example.

In the embodiment, the case of a solenoid of an electromagnetic valve is shown, but the present invention can be similarly implemented in other electric coil devices.

[Brief explanation of drawings]

1 and 2 are an exploded perspective view and a perspective view, respectively, of an electric coil device according to an embodiment of the present invention. 3a, 3b, and 3c are a plan view, a front view, and a right side view of the terminal 3 shown in FIG. 1, respectively. 4a and 4b are a longitudinal cross-sectional view and a cross-sectional view taken along line A--A of a solenoid valve incorporating the electric coil device of FIG. 2, respectively. 1...Coil bobbin, 1a...Brim portion, 1b. 1c...Socket, 2...Electric coil, 3...Terminal (earth terminal), 3a...
・Metal plate, 3b...Metal plate (protrusion), 4...
...terminal, 5,6...lead wire, 7...
... End plate, 8 ... Casing, 9.
... Core, 10 ... Compression coil spring, 11 ... Plunger, 13 ... Inlet, 14 ... Curved outlet, 15, 16, 17.・・・・・・
・O-ring, 18...Flange, 20...
...Connector, 21...Cover 22...
·resin.

Claims (3)

[Scope of utility model registration request] (1) Coil bobbin; An electric coil wound around the coil bobbin; A first terminal attached to the end of the coil bobbin and connected to one end of the electric coil; A first elastic part press-fitted into a hole at the end of the coil bobbin;
a second terminal that connects a second elastic part extending along the end surface of the coil bobbin to the other end of the electric coil; An electric coil device comprising: a casing press-contacted to a second elastic portion of a second terminal. (2) The casing includes a magnetic end plate with a terminal corresponding portion cut out and a cylindrical metal casing, and the magnetic end plate directs a part of the second elastic portion of the second terminal toward the end surface of the coil bobbin. The electric coil device according to claim 1, wherein the outer surface of the magnetic end plate is pressed by bending the open end of the cylindrical metal casing inward. (3) The second elastic portion of the second terminal includes a first portion pressed toward the end surface of the coil bobbin by the lower surface of the magnetic end plate, an outer circumferential surface of the magnetic end plate, and an inner circumference of the cylindrical metal casing. Claims of the above-mentioned utility model registration, wherein the second portion located between the magnetic end plate and the third portion pressed inward by bending the cylindrical metal casing toward the upper surface of the magnetic end plate are continuous. Paragraph 1 or 2
Electric coil device as described in section.