JPH082891Y2 - Magnet switch structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a magnet switch structure used for a vehicle starter switch or the like.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of magnet switch, the movable contact on the plunger side which is retracted by the excitation of the coil is located on the battery terminal side facing the movable contact. It is configured to perform a switching operation by simultaneously contacting the contact bolt and the motor terminal side contact bolt.

Then, when the switch is turned on, it is ideal that the movable contact is in a two-sided surface contact state in which the movable contact is in surface contact with the contact surfaces of both contact bolts. However, when there is a slight difference in inclination between the contact surfaces of the contact bolts or the surface is roughened, the movable contact may be in point contact with the contact bolt at two unstable points. At this time, the force caused by the retracting operation of the plunger acts on the contact point, but the disadvantage is that the moving function may rattle depending on the direction of the force and arc discharge may occur or contact resistance may increase and the switching function may deteriorate. Atsuta

Further, in the case of a battery terminal side contact bolt having a particularly high electric potential, when the number of contact with the movable contact is increased, the damage due to the transfer becomes remarkable, so that the contact surface is easily roughened, which is a problem.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a magnet switch structure capable of eliminating these drawbacks. In the magnet switch, the switch housing facing the movable contact is provided with a battery terminal side contact bolt and a motor terminal side contact bolt that are energized by contacting the movable contact with the plunger retracting operation. One contact bolt of the two contact bolts is formed of a bolt main body and a contact member fixed by the bolt main body, and the contact member has the same plane position protruding from the bolt head of the bolt main body. Forming a pair of independent contact surfaces located on the other side, and moving the three points by the pair of contact surfaces and one contact surface of the other contact bolt. It is characterized in that a contact contact surface is formed.

Further, in the above-mentioned one, the contact bolt having the pair of contact surfaces is a contact terminal side contact bolt.

The present invention, with this configuration, can prevent an increase in contact resistance and can remarkably improve the switching function of the magnet switch.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.
In the drawing, reference numeral 1 denotes a magnet switch used for a starter switch, and a yoke 2 of the magnet switch 1 has an exciting coil 4 composed of an end plate 3, a pull-in coil 4a and a holding coil 4b. Plunger 5 and the like having movable iron core 5a are internally provided. Further, a disk-shaped movable contact 7 is provided at the base end of the shaft portion 5b of the plunger 5 penetrating the end plate 3 via an insulating material 6, and the yoke 2 is arranged so as to face the movable contact 7. A switch housing 8 for covering the opening of the switch is provided.

The switch housing 8 is integrally formed of an insulating synthetic resin material, but the head portion 9a, 10a side is located inside the housing at the bottom portion facing the movable contact 7.
A battery terminal side contact bolt 9 and a motor terminal side contact bolt 10 projecting from the housing with their tip ends facing the plunger axis direction are integrally fixed through a predetermined distance.

Further, 11 is a contact member, and the contact member 11 is sandwiched between the head portion 9a of the battery terminal side contact bolt 9 and the bottom portion of the switch housing 8 which penetrate the hole 11a formed in the central portion. It is electrically connected to the battery terminal side contact bolt 9 and has a pair of independent contact portions 11b protruding toward the movable contact 7 side from the head 9a of the battery terminal side contact bolt 9. , 11c are formed. These contact portions 11b and 11c are formed in a flange shape, and the back side of the contact portions 11b and 11c are supported by abutting against the bottom surface of the switch housing, but the front surface sides of both portions are located on the same plane to form a pair of movable contact contact surfaces. ing. That is, in this embodiment, when the plunger 5 is retracted due to the excitation of the exciting coil 4, the pair of contact portions 11b and 11c on the battery terminal side contact bolt 9 side and the contact portion on the motor terminal side contact bolt 10 side are connected. Three movable contacts 7
It has a contact structure that makes contact at the same time.

In the embodiment of the present invention constructed as described above, when the exciting coil 4 is energized, the retracting operation of the plunger 5 energizes both contact bolts 9 and 10 through the movable contact 7. The contact portion on the contact bolt side that contacts with is composed of a pair of contact portions 11b and 11c on the contact terminal side contact bolt 9 side and a contact portion on the motor terminal side contact bolt 10 side (bolt head 10a). ing. Therefore, the movable contact 7 is brought into a stable point contact state of three points due to a slight difference in inclination of the contact surface and surface roughness, and as a result, a force due to the retracting operation of the plunger 5 acts. It also prevents rattling, and stabilizes by receiving this force by distributing it at three points, eliminating the problem that arc discharge occurs due to rattling like the conventional two points. As a result, good switching can be stably performed without fear of a significant voltage drop due to an increase in contact resistance. Moreover, since the contact resistance can be suppressed to a low level, defects due to metastasis can be significantly reduced,
Therefore, the contact life can be greatly extended, and
Good switching operation can be performed for a long period of time.

Further, in this embodiment, since the contacts of the battery terminal side contact bolt 9 having a high electric potential are two points, it is possible to effectively suppress the voltage drop and the surface roughness due to the loss, and to further improve the switching function. You can

[Advantages] In short, since the present invention is configured as described above, the movable contact on the plunger side may come into contact with the battery terminal contact bolt and the motor terminal contact bolt as the plunger retracts. The contact surface on the contact bolt side with which the movable contact contacts is two contact surfaces formed on one contact bolt side and one on the other side contact bolt.

As a result, it is assumed that the contact surface of each contact bolt has a slight difference in inclination and surface roughness, resulting in a point contact state.
The movable contact is in a stable point contact state at three points which are in point contact with each of these three contact surfaces, and receives the force due to the retracting operation of the penangier at the three points in a distributed manner. It is possible to prevent the movable contact from rattling like a point contact condition at two points, to prevent the occurrence of arc discharge and the increase in contact resistance, which in turn suppresses the voltage drop. Good switching can be performed. In addition, since the contact resistance is suppressed to a low level, it is possible to reduce the defects caused by the transition and extend the contact life, and it is possible to perform a good switching operation for a long period of time.

Also, since the contact terminal side contact bolt has a high potential,
When the contact bolt on which the pair of contact surfaces is formed is a contact terminal side contact bolt, the voltage drop and the surface roughness due to the loss can be effectively suppressed, and the switching function can be further improved.

[Brief description of drawings]

The drawings show an embodiment of a magnetic switch structure according to the present invention. FIG. 1 is a sectional view of the magnetic switch taken along the line AA shown in FIG. 2, and FIG. 2 is a magnetic switch. FIG. 3 is a side view of the net switch, FIG. 3 is a sectional view of the switch housing, FIG. 4 is an internal plan view of the same as above, FIG. 5 is a sectional view of the same as above, and FIGS. 6A and 6B are contact portions showing a comparison with a conventional example. It is a schematic plan view. In the figure, 1 is a magnet switch, 5 is a plunger, 7 is a movable contact, 8 is a switch housing, 9 is a contact terminal side contact bolt, 10 is a motor terminal side contact bolt, 11 is a contact member, 11b and 11c are contact parts. Is.

Claims (2)

[Scope of utility model registration request] 1. A switch housing facing a movable contact on the plunger side is provided with a contact terminal side contact bolt and a motor terminal side contact bolt that are energized by contacting the movable contact as the plunger retracts. In the magnet switch, one of the contact bolts is formed of a bolt body and a contact member fixed by the bolt body, and the contact member has a bolt head of the bolt body. More than that, a pair of independent contact surfaces located in the same plane position protruding is formed, and three movable contact contact surfaces are formed by the pair of contact surfaces and one contact surface of the other contact bolt. Features a magnet switch structure. 2. The magnet switch structure according to claim 1, wherein the contact bolt having a pair of contact surfaces is a contact bolt on the battery terminal side.