JP5276702B2 - Magnetic switch for starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a long-life starter magnet switch which cannot just cope with contact wear at the time a contact is closed but also cope with wear due to current cutoff at the time the contact is opened, thereby helping solve the problem that although a low flexural rigidity and thin plate-like member is used for a movable contact to restrict a movable contact bounce at the time the contact is closed and thereby reduce contact wear, the number of times a starter is used in an idling-stop car increases, so does the number of times the contact is opened and closed, giving rise to concern about wear. <P>SOLUTION: The starter magnet switch includes: a plunger which is suctioned by a solenoid, a rod which adjoins the plunger and moves resisting to a return spring, a plate-like movable contact which is attached to the rod and has contact points, one each at opposite ends, and a fixed contact having contact points which are shorted by the movable contact. The two contact point portions of the movable contact are greater in plate thickness than the middle portion, the thickened plate portion forming a level difference portion with the contact points of the movable contact, and the level difference portion defining a fulcrum-to-fulcrum distance L when the movable contact is pushed against the fixed contact points at opposite ends by a contact spring. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a starter magnet switch.

  The starter magnet switch converts electrical energy into mechanical energy, and opens and closes contacts using the energy and a spring built in the switch. By opening and closing the switch, the energy from the battery is supplied to the starter motor. , Is blocking. As a conventional device, there is a starter magnet switch described in Patent Document 1.

JP 2007-87882 A

  In recent years, the number of idling stop vehicles has increased, and in the starter type idling stop vehicles, the number of times of opening and closing the magnetic switch contacts is significantly increased compared to conventional vehicles. In the conventional device shown in Patent Document 1, a thin plate-like member having low flexural rigidity is used for the movable contact, and movable contact bounce when closing the contact is suppressed, and contact wear is suppressed. However, in an idling stop vehicle, the number of times the starter is used increases, and the number of contact opening / closing times increases.

In the conventional apparatus, although the contact wear due to the movable contact bounce is suppressed, the thickness of the movable contact is thin. Therefore, when the number of times of use is large, the margin of contact wear is small and it is difficult to apply to an idling stop vehicle.
SUMMARY OF THE INVENTION The present invention solves the above-described problems, and it is an object of the present invention to obtain a long-life starter magnet switch that can handle not only contact wear when closing a contact but also wear due to current interruption when the contact is opened. Objective.

The starter magnet switch according to the present invention includes a plunger that is attracted by an energized solenoid, a rod that contacts the plunger and moves against a return spring, a central portion is attached to the rod, and contact portions are provided at both ends. A plate-like movable contact, and a fixed contact having a pair of contact parts short-circuited by the movable contact,
The contact portion of the fixed contact is composed of a motor side fixed contact portion connected to a starter motor and a battery side fixed contact portion connected to a battery, and the movable contact portion is formed of both contact portions of the movable contact. the plate thickness is made thicker than the central portion, to form a stepped difference portion in the thickened thickness portion, at least one of the fixed contact portion of the motor-side fixed contact portion and the battery-side fixed contact portion The surface facing the contact portion of the movable contact is formed in a spherical shape, and the topmost portion of the spherical surface is disposed slightly inside the stepped portion .

According to the starter magnet switch according to the present invention, since the thickness of the central portion of the movable contact is thin, the flexural rigidity is low, and bounce when closing the contact is unlikely to occur. In addition, since the thickness of the movable contact end that comes into contact with the fixed contact is thick, it has a sufficient wear allowance against wear due to the breaking current when the contact is opened, so a long-life magnet switch can be obtained, It can also be applied to idling stop vehicles.
Furthermore, in the conventional device, a portion that contacts the movable contact is provided at the outermost part of the fixed contact, and thus it is necessary to specify the direction when the fixed contact is assembled to the cap. Disappear. Therefore, it becomes possible to simplify equipment at the time of manufacture.
According to the starter magnet switch according to the present invention, it is possible to suppress a bounce that is likely to occur when the contact is closed, and to increase a margin for wear due to a breaking current when the contact is opened.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the magnet switch for starters in Embodiment 1 of this invention, (a) is a sectional side view, (b) is an expanded sectional view of a motor side movable contact part. It is a sectional side view of the starter magnet switch in Embodiment 2 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, the same code | symbol shows the same or an equivalent part between each figure.

Embodiment 1
A starter magnet switch according to Embodiment 1 will be described with reference to FIG.
In FIG. 1, reference numeral 2 denotes a solenoid, which generates a magnetic field when energized. A plunger 3 is attracted in a direction approaching the internal iron core 4 by a magnetic field generated by energizing the solenoid 2. Reference numeral 5 denotes a rod that moves in contact with the attracted plunger 3, 6 denotes a movable contact that is assembled to the rod 5, 7 denotes a contact spring that presses the movable contact 6, and 8 denotes an insulating member that insulates the movable contact 6 from the ground portion. , 9 is an insulating washer arranged behind the movable contact 6, 10 is a stopper that receives the load of the contact spring 7 behind the movable contact 6, 11 is a return spring that returns the movable contact 6 to the position before operation, and 12 is movable. A fixed contact that is short-circuited to the contact 6, 13 is a cap that supports one end of the fixed contact 12 and the return spring 11, 14 is a return spring of the plunger 3, and 15 is a case that constitutes a magnetic circuit and holds internal components such as a solenoid. It is.

The fixed contact 12 has a pair of fixed contact portions 12a and 12b that are short-circuited by the movable contact 6. The fixed contact portion 12a is connected to a battery (not shown), and the fixed contact portion 12b is a motor portion (not shown) of the starter. )It is connected to the. Hereinafter, 12a is referred to as “battery side fixed contact portion”, and 12b is referred to as “motor side fixed contact portion”.
Moreover, the movable contact 6 is formed of a plate-like material, the central portion is attached to the rod 5, and the movable contact portions 6a and 6b are provided at both ends, respectively. The step portion D is formed at a position between the contact portion and the central portion of the movable contact, as shown in FIG. 1B . Hereinafter, 6a is referred to as “battery side movable contact portion”, and 6b is referred to as “motor side movable contact portion”.
Further, the step distance D defines the distance L between the fulcrums when the movable contact 6 is pressed against the two fixed contact portions 12 a and 12 b by the contact spring 7.

Next, the operation will be described.
When the solenoid 2 is energized, the plunger 3 is sucked and starts moving to the left side of FIG.
In the process of movement, the rod 5 abuts, the rod 5 and the movable contact 6 assembled thereto are moved, and the movable contact 6 is brought into contact with the fixed contact 12.
As a result, the battery-side fixed contact portion 12a and the motor-side fixed contact portion 12b are short-circuited, power is supplied from the battery to the motor portion, and the starter starts the engine.
After the engine is started, energization to the solenoid 2 is stopped. The movable contact 6 is separated from the fixed contact 12 by the energy of the return spring 11 and interrupts the current.

The movable contact 6 may be made of copper having a high softening temperature added with silver or zirconium. This is because there is a case where the starter is energized for a long time even in an idling stop vehicle, in which case the movable contact 6 becomes high temperature. Further, the difference in thickness between the end portion and the central portion of the movable contact 6 may be configured by pressing a flat plate, or a deformed copper strip having a thick step portion from the beginning may be used as a material.
When a deformed copper strip is used, a movable contact with higher heat resistance can be obtained because there is no work hardening by pressing at the center of the movable contact.

The motor-side movable contact portion 6b and the battery-side movable contact portion 6a may change the thickness of the contact portions.
That is, the thickness of the motor-side movable contact portion 6b facing the motor-side fixed contact portion 12b may be thicker than that of the battery-side movable contact portion 6a.
That is, the copper transition is the same as the direction of current flow, and the motor-side contact portion 6b of the movable contact has a smaller amount than the battery-side movable contact portion 6a. The wear margin of the easy motor side movable contact portion 6b is increased.

Embodiment 2
Next, a starter magnet switch according to Embodiment 2 will be described with reference to FIG.
In FIG. 2, when applied to a large starter having a large breaking current, or when applied to a vehicle having a higher number of required operations, both fixed contacts that are opposed to and contact the movable contact 6 with respect to the first embodiment. Of the portions 12a and 12b, at least one of the fixed contact portions may be spherical.
The topmost part of the spherical surface is disposed slightly inside the portion where the thickness of the end of the movable contact 6 is increased. With this arrangement, even if the end of the movable contact 6 is worn out and the difference in thickness from the central portion becomes small, the movable contact 6 comes into contact with the top surface of the spherical surface of the fixed contact 12. The change of the span in contact with the two fixed contacts 12 is also slight, and the flexural rigidity of the movable contact 6 is kept low.

  The starter magnet switch of the present invention can also be applied to a vehicle whose use is an idling stop vehicle.

  In addition, within the scope of the present invention, the present invention can be combined with each other, or can be appropriately modified or omitted.

DESCRIPTION OF SYMBOLS 1 Magnet switch 2 Solenoid 3 Blanker 4 Internal iron core 5 Rod 6 Movable contact 6a Battery side movable contact part 6b Motor side movable contact part 7 Contact spring 8 Insulation member 9 Insulation washer 10 Stopper 11 Return spring 12 Fixed contact 12a Battery side fixed contact part 12b Motor side fixed contact portion 13 Cap 14 Spring 15 Case.

Claims (4)

Plunger that is attracted by an energized solenoid, a rod that contacts the plunger and moves against a return spring, a plate-like movable contact that has a central portion attached to the rod and has contact portions at both ends, and the movable A fixed contact having a pair of contact portions short-circuited by the contact;
The contact portion of the fixed contact is composed of a motor side fixed contact portion connected to a starter motor and a battery side fixed contact portion connected to a battery, and the movable contact portion is formed of both contact portions of the movable contact. the plate thickness is made thicker than the central portion, to form a stepped difference portion in the thickened thickness portion, at least one of the fixed contact portion of the motor-side fixed contact portion and the battery-side fixed contact portion The starter magnet switch is characterized in that a surface facing the contact portion of the movable contact is formed in a spherical shape, and the top of the spherical surface is disposed slightly inside the stepped portion . The thickness of the contact portion of the movable contact facing the upper SL motor side fixed contact portion, a magnet for starter according to claim 1, characterized in that thicker than contact portions of the movable contact facing the the battery-side fixed contact portion switch.     The above-mentioned movable contact is manufactured by using a deformed copper strip formed by a stepped portion whose both side edges in the width direction are thicker than the center portion, and punching this deformed copper strip into a predetermined shape by cutting or pressing. The starter magnet switch according to claim 1, wherein the starter magnet switch is provided. The starter magnet switch according to any one of claims 1 to 3 , wherein the use application is an idling stop vehicle .

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