KR950002210Y1 - Electromagnetic switch device - Google Patents

Abstract

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Description

Electronic switch device

The present invention relates to a connection structure between a fixed contact point and a movable contact point of an electronic switch device.

Conventional technology

3A is a cross-sectional view showing the entire electronic switch device of the related art.

In the drawing, (1) is an electronic switch device, (2) is a magnetic furnace case, (3) is an excitation coil wound around a resin bobbin (4), a thick coil suction coil 3a, and a thin coil support coil. It consists of (3b). And the reel 31 used to wind a coil is provided in the rear end side of the bobbin 4, and the lead wire 30a of the suction coil 3a and the lead wire 30b of the support coil 3b are pulled out. Reference numeral 5 is a fixed iron core, 6 is a guide bush which is fitted to the inside of the bobbin 4 and formed of a nonmagnetic material fixed to the fixed iron core 5, 7 is opposed to the fixed iron core (5) The movable iron core capable of sliding the inside of the guide bush 6 in the axial direction (8) is a hook whose rear end is inserted into the insertion hole 7a of the movable iron core 7, and the overrunning clutch (not shown) of the starter is The moving lever 9 to move is connected. Reference numeral 10 is a spring support fixed to the end of the insertion hole 7a, 11 is a buffer spring for pressing the hook 8 in the retracting direction, and 12 is a return to return the movable core 7 forward. The spring 13 is formed of a synthetic resin molded article and is a cap coupled to the end of the fixed iron core 5 via a rubber packing 14, and is caulked at the end of the magnetic case 2. 15a and 15b are a pair of fixed contact points (only one side is shown in the figure), and the terminal bolt portions 16a and 16b are exposed to the outside and fixed through the cap 13. The terminal of the lead wire in a power supply (storage battery) is connected to the terminal bolt part 16a on the other hand, and the terminal of the lead wire for brushes of an electric motor is connected to the other terminal bolt part 16b. (20) is supported by the movable rod via the insulating member 22, the movable contact facing the pair of fixed contacts (15a, 15b), (23) is a fixed frame, (24) is a contact pressure to the movable contact (20) Compression springs for providing 25, a compression spring for returning the movable rod 21 forward, 32 is a lead wire from the start switch of the internal combustion engine as an external terminal connected to the lead wires (30a, 30b) of the coil Is connected.

(33) denotes the solder lead.

The operation of the electronic switch will be described below. When the start switch (not shown) is inserted, the suction coil 3a and the support coil 3b are energized, and the movable iron core 7 is attracted to the fixed iron core 5 to retreat.

As a result, the hook 8 retreats to rotate the moving lever 9 to advance the overrunning clutch (not shown). On the other hand, the movable contact 20 is interlocked and retracted by the retraction of the movable iron core 7, and contacts the fixed contacts 15a and 15b, and energizes the circuit of an electric motor to rotate an armature.

A conventional contact structure between a fixed contact and a movable contact is described by FIGS. 3A to 4B.

FIG. 3B is a diagram showing a connection state between the fixed contact point and the movable contact point of the electronic switch device of FIG. 3A, wherein both the fixed contact points 15a and 15b and the movable contact point 20 are made of copper.

In addition, in the conventional examples shown in FIGS. 4A and 4B, in order to increase wear resistance, a contact member having a high circular wear resistance and good electrical characteristics having a substantially circular shape, for example, an Ag type, in the entire head portion of the fixed contact 15a ( 50) is attached.

The challenge that the invention is trying to solve

The following problems have arisen in the contact structure of the fixed contact point and the movable contact of the conventional electronic switch device.

First, in the conventional examples shown in FIGS. 3A and 3B, contact wear occurs at the connection portions between the fixed contact point and the movable contact point, and thus it cannot withstand long-term use.

In addition, in the conventional examples shown in FIGS. 4A and 4B, since the Ag-based contact member 50 having high abrasion resistance and good electrical characteristics is attached to almost the entire area of the fixed contact 15a, the cost is greatly increased, resulting in mass production. It was difficult to apply.

In the analysis of the wear of the fixed contact point or the movable contact point, the wear state of the contact point is melted and attached to the contact point on the opposite side as shown in FIGS. 5A and 5B. 6 shows a circuit configuration diagram of the electronic switch device.

On the other hand, the contact between the fixed contact point and the movable contact point is not determined by the projection area of each other, but is partially contacted by the surface precision of the contact surface, the inclination of the contact surface, and the like. Therefore, the partial contact causes the melting of the metal to cause wear of the contact.

The present invention has been made to solve the above problems, and an object thereof is to provide a contact structure of an electronic switch device having a low cost and high wear resistance.

The electronic switch device according to the present invention is provided with a contact member having a contact area smaller than its opposite area on either the fixed contact point or the movable contact point so that the fixed contact point and the movable contact point are partially contacted in advance, and the contact member has a high wear resistance material. It is composed of.

1 is a sectional view showing the principal parts of one embodiment of an electronic switch device according to the present invention;

1B is a front view showing a connection state between the fixed contact point and the movable contact point.

1C is a side view of the connection state between the fixed contact and the movable contact.

Figure 2a is a sectional view of the main portion showing another embodiment of the present invention.

2B is a front view showing a connection state between the fixed contact point and the movable contact point.

2C is a side view of the connection state between the fixed contact and the movable contact.

3A is a cross-sectional view showing the entire electronic switch device of the related art.

3B is a front view showing a connection state between the fixed contact point and the movable contact point.

Fig. 4A is a sectional view of the entire electronic switch device in the related art.

4B is a front view showing a connection state between the fixed contact point and the movable contact point.

5A and 5B are diagrams showing the wear state of the contacts.

6 is a circuit diagram showing a circuit configuration of an electronic switch device.

* Explanation of symbols for main parts of the drawings

15a: Battery side fixed contact 15: Motor side fixed contact

20,20A: Movable contact 60,70: Contact member

According to the electronic switch device of the present invention, the fixed contact point and the movable contact point are provided to be partially contacted via a contact member having high wear resistance, and endure long-term use and are advantageous in terms of cost.

(Example)

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1A is a sectional view showing the principal parts of an embodiment of an electronic switch device according to the present invention, FIG. 1B is a front view showing a connection state between a stationary contact and a movable contact, and FIG. 1C is a side view thereof.

In the drawing, a contact member 60 made of Ag-based high wear-resistant material is provided at the stationary contact 15a on the battery side, and a contact member made of Ag-based high wear-resistant material at the movable contact on the motor side ( 70) is installed. In addition, the contact members 60 and 70 are provided so that the fixed contact points 15a and 15b and the movable contact point 20 have an area smaller than the projected areas facing each other.

That is, according to the above embodiment, for example, Ag-based high-strength is applied to the fixed contact or movable contact (movable contact at the battery side and the movable contact at the battery side) of the side where the electrons flow (the side where the electrons reach). By providing the contact members 60 and 70 formed of a wear-resistant material, the contact metal on the side of the electron inflow becomes difficult to dissolve and endures long-term use.

Furthermore, since the contact members 60 and 70 are provided with a smaller area than the opposite area between the fixed contact point and the movable contact point, the contact members 60 and 70 become very effective including the cost.

FIG. 2A is a sectional view showing the principal parts of another embodiment of the present invention, and FIG. 2B is a front view showing a connection state between a stationary contact and a movable contact, and FIG. 2C is a side view thereof.

In the figure, reference numeral 60 denotes a contact member formed of, for example, Ag-based high wear-resistant material provided at the fixed contact 15a on the battery side, and the contact member 60 faces the fixed contact point and the movable contact point to each other. It is provided with an area smaller than the projected area. 20A is a disk-shaped movable contact, and is attached so as to be rotatable about the movable contact axis.

In other words, according to the above embodiment, the contact member 60 is made of, for example, a contact member 60 made of a Ag-based high wear-resistant material at the fixed contact point 15a of the battery shaft of the axis through which the electrons flow (the axis that the electrons reach). In this part, the fixed contact and the movable contact are actively contacted, so that the metal of the other part is not dissolved and can withstand long-term use. On the other hand, since the movable contact 20A is configured to be rotatable about the movable contact axis, it is not necessary to provide a contact member having high wear resistance due to uniform wear.

As described above, according to the present invention, by providing a high wear resistance contact member having a contact surface having a smaller contact surface than either of the fixed contact point or the movable contact point, it is possible to provide an electronic switch device having good durability and advantageous cost. have.

Claims (2)

An electronic switch device for starter motors having at least one pair of fixed contacts 15a and 15b and movable contacts 20 disposed to face each other and for opening and closing a current supplied from the direct current power source to the starter motor by contacting and disconnecting the contact points. The contactor of the starter motor, characterized in that the contact members (60, 70) having a contact area smaller than that of the opposing area are provided only on the side of the contact where the current flows out toward the contact on the opposite side. Switch device. The contact member 60 according to claim 1, wherein the movable contact 20A is rotatable and has a contact area 60 having a contact area smaller than the projected area of the movable contact 20A only on the side of the fixed contact 15a on which the current flows. The electronic switch device for starter motors characterized by the above-mentioned.