KR0123564Y1 - Magnet switch - Google Patents

Abstract

[purpose]

It is to provide a magnet switch for a starting motor with a completely new structure that is improved so that the progress of burnout of the movable contact can be smoothed by changing the area where the movable contact is in contact with the fixed contact every time.

[Configuration]

By arranging the intermittent rotation means between the plunger and the movable contact to cause the plunger to interlock the movable contact via the intermittent rotation means, the constant circumferential angle is also rotated when the movable contact is switched on and off with both fixed contacts, The intermittent pivot means includes a sleeve mounted at one end of the pull-in coil, a propelling tooth integrally protruded in parallel with the axial direction on the inner circumferential surface of the sleeve, and a groove formed axially on the outer circumferential surface. And the ratchet teeth integrally formed with the movable body that is received in the sleeve and slides in the axial direction in accordance with the above-mentioned pushing tooth and the boss of the movable contact described above, and the pitch formed symmetrically at the end of the movable body corresponding thereto. It consists of a drive tooth.

Description

Magnet switch for starting motor

1 is a cross-sectional view of a magnet switch depicting an embodiment of the present invention.

2 is a cross-sectional view taken along the line II-II of FIG.

3 is a view for explaining the operating state of the present invention.

4 is a partial cutaway sectional view showing a conventional starting motor.

* Explanation of symbols for main parts of the drawings

2: housing 4: pull-in coil

6: Plunger 10: movable contact

16: Fixed contact 18: Intermittent rotation means

180: Sleeve 182: Propulsion tooth

184: Home 186: Moving body

188: Ratchet tooth 190: Pitch driven tooth

The present invention relates to a magnet switch for a starting motor.

The initial starting of the engine uses a starting motor in the case of a vehicle.

The starting torque must be large because the starting motor must overcome the cylinder volume of the engine, the compression pressure, the frictional force of the moving part, and the like so that the engine is driven at the startable speed.

For this purpose, the starting motor employs a DC series motor.

The starting motor also has a power transmission element for driving the engine.

The power transmission element arranges the pinion on the shaft of the starting motor, and the pinion is engaged with the ring gear formed on the flywheel of the engine so that the engine cranks.

On the other hand, the pinion on the motor shaft should be arranged to be able to move in the axial direction, so as not to be overrun after the engine cranks by engaging the ring gear of the flywheel.

The axial movement of the pinion in the starting motor is mainly applied to the forward and backward movement by rotation and inertia by the magnet switch.

4 depicts an example of a starter motor equipped with a magnet switch. The pinion P of the motor M interferes with the drive lever D, which is rocked by the plunger F of the magnet switch S, and is interlocked in the axial direction.

As such, the structure in which the pinion P is interlocked with the magnet switch S to engage / deviate from the ring gear of the engine is mainly applied to a vehicle that needs to crank the engine with a strong force such as a bus or a truck.

The internal structure of the magnet switch (S) is a fixed contact in which the plunger F, which is slid by the excitation force of a pull-in coil, is divided into two by interfering with the movable contact arranged at a predetermined interval. It is possible to switch on. In other words, the pinion P is engaged with the ring gear and the rotational drive of the motor M is performed.

Here, the current applied to the motor M is a high current sufficient to crank the engine, and this high current flows through the fixed contact divided into two and the movable contact connecting them.

For this reason, when a movable contact falls from a fixed contact, the spark generate | occur | produces and the contact burns frequently.

In particular, burnout of the contact occurs mainly in the movable contact, because it is convenient to replace the movable contact in terms of maintenance and repair.

In addition, conventionally, the movable contact is made into a disc to set the area of contact with the fixed contact to be wider, but even if this method is used, the area where the movable contact is in contact with the fixed contact becomes constant, which may slow down the progress of burnout slightly. However, the effect of significantly extending the service life cannot be expected.

Therefore, an object of the present invention is to provide a magnet switch for a starting motor with a completely new structure, which is improved so that the burnout progress of the movable contact can be smoothed by changing the portion where the movable contact is in contact with the fixed contact every time.

In accordance with the above object, the present invention arranges the intermittent pivot means between the plunger and the movable contact so that the plunger interlocks the movable contact via the intermittent pivot means, when the movable contact is switched on and off with both fixed contacts. It is characterized in that a certain circumferential angle is also configured to rotate.

In such a configuration, the intermittent pivot means includes a sleeve mounted at one end of the pull-in coil, a propulsion tooth that is integrally protruded in parallel with the axial direction on the inner circumferential surface of the sleeve, and axially at the outer circumferential surface. And a ratchet tooth formed integrally with the boss of the movable contact, which is received in the sleeve and slides in the axial direction according to the fitting of the groove formed by the pushing tooth, and the terminal of the movable body corresponding thereto. Characterized in that it consists of a pitch driving tooth formed symmetrically in the.

With the above-described configuration, the plunger interlocks the movable contact via the intermittent rotation means, and in this process, the above-mentioned propulsion teeth and the pitch drive teeth of the movable body alternately engage with the ratchet teeth of the movable contact, and thus the above-mentioned every time the switching operation is performed. The movable contact will rotate a certain circumferential angle.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a side cross-sectional view showing an embodiment according to the present invention, in which a plunger 6 is slidably arranged at the center of a pull-in coil 4 annularly arranged inside the housing 2.

The plunger 6 is interlocked with the pinion P of FIG. 4 through its termination while advancing in the axial direction under the influence of the magnetic force generated in the pull-in coil 4.

The plunger 6 is pressed against the return spring 8 so that it is always placed in a fixed position. And coaxial with the plunger 6, in the symmetrical direction, the movable contact 10 on the disc is also supported by the fixed shaft 12 and slidably arranged, and the movable contact 10 is also always placed in a fixed position. Since it is suppressed by the spring 14 so that it may be replaced, it will replace with the fixed contact 16 divided into two at regular intervals.

On the other hand, intermittent rotation means 18 is disposed between the plunger 6 and the movable contact 10.

The intermittent pivoting means 18 is a sleeve 180 mounted at one end of the pull-in coil 4, and a plurality of propelled integrally protruded in parallel with the axial direction on the inner circumferential surface of the sleeve 180. The moving body 186 accommodated in the sleeve 18 according to the tooth 182 and the groove 184 formed in the axial direction on the outer circumferential surface of the sleeve 18, and slid in the axial direction, and the above-mentioned. It consists of a ratchet tooth 188 formed integrally with the boss of one movable contact 10 and a pitch drive tooth 190 symmetrically formed at the end of the movable body 186 described above.

The intermittent drive means 18 has the above-described configuration, as shown in FIG. 2, as the propelling teeth 182 formed on the inner circumferential surface of the sleeve 180 fit into the grooves 184 of the movable body 186. Between the 182 and the pitch drive tooth 190 is arranged shifted by the circumferential angle θ.

Accordingly, when the first degree pull-in coil 4 is excited and the plunger 6 slides in the direction that resists the return spring 8, the movable body 186 is moved only in the axial direction while the movable contact 10 is moved. The pitch drive tooth 190 of the mobile body 186 meshes with the ratchet tooth 188 of the ratchet tooth 188 to rotate.

That is, as shown in FIG. 3, the movable contact 10 stops at a predetermined position by being engaged by the pushing tooth 182 at the bottom of the ratchet tooth 188 in the switching-off state, and the pitch driving tooth of the movable body 186 is stopped. 190 is spaced apart from ratchet teeth 188 at some distance. When the movable body 186 slides in conjunction with the plunger 6, the pitch drive tooth 190 at its end is engaged with the ratchet tooth 188 while transcending the pushing tooth 182.

At this time, since the pitch driving tooth 190 pushes up the ratchet tooth 188, the ratchet tooth 188 stops rotating by the circumferential angle θ of FIG. 2 due to the sliding action of the inclined surfaces in contact with each other. The furnace slides along the axial direction to switch between the two fixed contacts 16.

In such a switched-on state, the top surface of the ratchet tooth 188 is placed in a position where it can contact the propulsion tooth 182 immersed into the groove 184 of the movable body 186. Therefore, in the switching-off state in which the pressure of the plunger 6 applied to the movable body 186 is dissipated, the pitch driven tooth 190 of the movable body 186 falls away from the ratchet tooth 188 and at the same time the tightness of the ratchet tooth 188 Since the ground is in contact with the pushing teeth 182 and slides, the movable contact 10 falls from both fixed contacts 16 and the above-mentioned pushing teeth 182 interfere with the ratchet teeth 188 and engage with the bottom. You will turn to.

As a result, the magnet switch of the present invention has a contact portion between the two contacts by turning the movable contact 10 at a predetermined circumferential angle every time the movable contact 10 switches between the two fixed contacts 16. Is reversed each time, and the burnout of the contact shows a gentle effect.

As described above, the magnet switch of the present invention automatically rotates the movable contact at a predetermined angle every time the fixed contact and the movable contact are turned on and off, thereby extending the life of the contact even if burnout occurs between both contacts. Compared to the switch, the maintenance period is significantly extended.

Claims (2)

A magnet switch for a starting motor, wherein the plunger is slidably disposed at a center of a pull-in coil housed in a housing, and the movable contact is interlocked by the plunger to switch between two fixed contacts. A plunger 6 causes the movable contact 10 to interlock with the intermittent pivoting means 18 so that the movable contact 10 is switched on and off with both fixed contacts 16 and has a constant circumferential angle. Magnet switch for starter motor which is made to rotate. 2. The intermittent pivoting means (18) according to claim 1, wherein the intermittent pivoting means (18) is integrated with the sleeve (180) mounted at one end of the pull-in coil (4) and parallel to the inner circumferential surface of the sleeve (180) in the axial direction. Propelled teeth 182 protruding into a plurality of parts, and grooves 184 formed in the axial direction on the outer circumferential surface thereof are accommodated in the sleeve 180 according to the propelled teeth 182 and slide in the axial direction. And a ratchet tooth 188 formed integrally with the boss of the movable contact 10 and the pitch drive tooth 190 symmetrically formed at the end of the movable body 186 corresponding thereto. Magnet switch for starting motor, characterized in that configured.