JPS6172873A - Magnet switch for starter - Google Patents

Abstract

PURPOSE:To perform the interception of a continuous rating current to a starter motor without fail, by making up a circuit structure so as to make no current flow into a suction coil when a transistor being turned on with a starter switch closed is turned off if making the starter switch open. CONSTITUTION:With a starter switch 23 closed, a holding coil 1 is excited and a first moving iron core 2 is attracted, making a first connection circuit close by a first traveling contact 3 in response to movement of the said iron core 2. In addition, with this connection circuit closed, the suction coil 4 is excited, attracting a second moving iron core 5, and a pinion 25 is slidingly moved via a lever 24 whereby it is made so as to be engaged with a ring gear (unillustrated herein) of an internal combustion engine. And a second connection circuit is closed by a second traveling contact 6 is response to movement of the second iron core 5 whereby each starter motor (27 and 28) is energized with a continuous rating current. Likewise, in time of closing the starter switch 23, a transistor 30 is turned to ON, and an interval between one end of the suction coil 4 and the second connection circuit is connected together.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnet switch for a starter used to start an internal combustion engine.

[Conventional technology]

As previously described in Utility Model Publication No. 55-45088), the starter switch is closed and the holding coil is energized,
The first movable iron core is moved by the excitation of this holding coil, and the first movable contact provided on the first movable iron core is moved to the first movable iron core.
, by bringing it into contact with the second fixed contact, the attraction coil is excited, and the excitation of the attraction coil moves the second movable iron core to engage the pinion with the ring gear of the internal combustion engine, and the second The second movable contact provided on the movable iron core is connected to the third movable contact. Some devices are designed to energize the starter motor by contacting the fourth fixed contact.

However, when the second movable iron core is attracted, the second movable contact and the third. If the fourth fixed contact does not conduct due to poor contact, etc., even if the starter switch is turned off to cut off the current in the holding coil, the current will continue to flow to the attraction coil, so the first movable iron core will increase the attraction force of the attraction coil. The problem is that the first fixed contact and the first and second fixed contacts remain closed by the first movable contact, and current continues to flow through the attraction coil, causing damage to the attraction coil. There is.

Therefore, in order to solve the above-mentioned problems,
As shown in Japanese Patent No. 210533, when the second movable core is attracted, the tip of the second movable core hits just before the second movable contact and the third and fourth fixed contacts come into contact with each other. By providing a switch that opens the energizing circuit to the attraction coil, the second movable contact and the third. Even when there is poor continuity between the fourth fixed contacts, the second movable iron core held by the holding coil will not turn on the starter switch because the switch is open and the suction coil is not energized. When the first movable iron core returns and the first movable iron core returns, the first movable contact is moved by δ11 from the first and second fixed contacts before the switch closes, so that the switch is reliably energized. be able to.

[Problem that the invention seeks to solve]

However, in the conventional double series, the starter switch is closed, the holding coil is energized, and the first movable contact is switched to the first. Even if the second fixed contact is contacted and the attraction coil is energized, for some reason the second movable core does not move and the switch remains closed, and then the starter switch is opened. There is a problem in that the current continues to flow through the attraction coil, causing the attraction coil to burn out.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to reliably turn off the magnetic switch even when the second movable iron core does not move.

Means for Solving Problem C] A holding coil that is energized when the starter switch is closed, a first movable iron core that is attracted when this holding coil is energized, and a A first movable contact that closes a first connection circuit in response to the movement of the movable iron core; an attraction coil that is excited when the first connection circuit is closed; and an attraction coil that is excited when the first connection circuit is closed; a second movable core for engaging the pinion with a ring gear of the internal combustion engine; a second movable contact for closing a second connection circuit in response to movement of the second movable core; When the starter switch is closed by closing the connection circuit, the starter motor is energized, and the first and second fjt return springs for returning the first and second movable iron cores to their original positions; The magnet switch for a starter is provided with a transistor that is turned on and connected to the second connection circuit via one end of the attraction coil, a collector, and an emitter.

[For production]

The transistor turns on when the starter switch is closed, and turns off when the starter switch is opened, preventing current from flowing to the suction coil.

(Example〕 The present invention will be described below with reference to embodiments shown in the drawings.

In the first embodiment shown in FIGS. 1 to 10, reference numeral 1 denotes a holding coil, on the inner circumference of which a suction coil 4 is arranged concentrically. A cylindrical first movable core 2 is slidably disposed on the inner periphery of the attraction coil 4, and both ends are open, and a second movable core 5 is slidably disposed on the inner periphery of the cylindrical first movable core 2. They are arranged concentrically.

3 is a first movable contact driven by the first movable core 2; 6 is a second movable contact driven by the second movable core 5, and is fixed through the center of the second movable contact 5. It is mounted on a central jaw 1-5A made of an electrical insulator via a contact spring 6a. Reference numeral 7 denotes a fixed iron core disposed adjacent to the axial side surface of the holding and attracting coil 1.4, which is formed into a disk shape as shown in FIG. A center hole 7C is formed, and two notches 7a and 7b are radially formed at a predetermined interval on the periphery of the center hole 7c. 8 is a switch field, and this switch field 8 and fixed iron core 1
A holding and attracting coil 1.4 is housed in the space surrounded by 0 and 0, and the first and second movable cores 2.5 penetrate the left end of the yoke in FIG. 3 and protrude to the outside. be. 9
is a sleeve fixed to the inner periphery of a resin hobbin 9 around which the holding and suction coil 1.4 is wound; its left end in FIG. Third
It penetrates the left end in the figure and projects to the outside. and,
A dish-shaped washer 12 is arranged at the left end of the yoke 8 in FIG. 3 and the left end of the first movable core 2 in FIG. A second return spring 13 for returning the second movable iron core 5 to its original position is interposed in a compressed state between the second movable iron core 5 and the second movable iron core 5a. By abutting the left end of the movable iron core 2, the first
The position of the movable iron core 2 is regulated.

Reference numeral 16 denotes a force bar made of insulating resin which is caulked and fixed to the right end of the yoke 8 in FIG.
．． The second movable contacts 3 and 6 are arranged in parallel. 15
is a first plate fixed to the outer circumferential side of the cover 16 by penetrating inside and outside.
With the fixed contact of , the first
A contact surface 15a facing the movable contact 3 and a cover 1
A cylindrical caulking part 15b for caulking and fixing to 6 is integrally formed with a sintered metal based on copper or a pearled iron plate plated with copper or tin, and this caulking part The lead wire 4a of the attraction coil 4 is inserted into the cylindrical shape of 15b and fixed by soldering. Further, at a position facing the second movable contact 6 of the cover 16, a second movable contact 6 is provided at a distance from each other. Third fixed contacts 17A and 17B penetrate and are fixed to the inner cover 1. Further, a portion 17b of the third fixed contact 17B extends to a position facing the first movable contact 3. Here, the first to third fixed contacts 15.17A
, 17B are all on the same plane.

Further, as shown in FIGS. 6 and 7, an arc plate-shaped resin collar 18 is disposed opposite to the right outer wall of the first movable iron core 2 in FIG. An axial notch 18C is formed on the iron core 2 side, and columnar parts 18a and 18b on both sides of this notch 18C are connected to the fixed iron core 7.
Notch 7a.

7b with a loose fit. Here, the axial dimension of the notch 18C is slightly larger than the sum of the axial movement dimension of the first movable core 2 and the plate thickness of the fixed core 7. 19
is a shaft made of a non-magnetic pair made of resin or aluminum, and is press-fitted or fixed to one end of the collar 18 or is integrally formed therewith.

This shaft 19 is provided with a stopper 19a, and a first movable contact 3 and a washer 21 are movably mounted on the outer periphery of the shaft 19 between this stopper 19a and the collar 18 via a compressed contact spring 20. has been done. Furthermore, a first return spring 14 is interposed in a compressed state between the stopper 19a and the inner peripheral surface of the cover 16 to return the first movable core 2 to its original position. The collar 18 is brought into contact with the axial side 1 face of the first movable iron core 2 via the shaft 19. Here, the first
The gap between the second movable core 2 and the fixed core 7 is smaller than the gap between the second movable core 5 and the fixed core 7 when not in operation. The first movable contact 3 and the first and third fixed contacts 1 in
5.17B is also the gap between the second
This is smaller than the gap between the movable contact 6 and the second and third fixed contacts 17A and 17B.

Further, the second movable iron core 5 and the third
A lever connecting portion 5b connecting a lever for moving a pinion and a one-way clutch is formed at the left end in the figure, and the position of the second movable iron core 5 is restricted when it is not in operation.
Due to the spring force of the second return spring 13, the cut-out portions of the spline joints between the one-way crank and the armature shaft come into contact with each other.

FIG. 1 schematically shows the overall configuration when the magnetic switch shown in FIG. 3 is combined with a starter motor, in which 22 is a power battery, 23 is a starter switch, and 24
is a lever connected to the lever connecting portion 5b of the central shaft 5A to move the pinion 25 and the one-way clutch 26. 27 and 28 are the armature and field coil of the starter motor, and this armature 27
The rotation of the pinion 2 through the one-way clutch 26
5 is designed to be rotationally driven. The connection point between the starter switch 23 and the holding coil 1 is connected to the base of a transistor 30 via a resistor 31.

Further, the collector of the transistor 30 is connected to the other end of the attraction coil 4 whose one end is connected to the first fixed contact 15,
The emitter is connected to the second fixed contact 17A. The battery 22, the third fixed contact 17B, the first fixed contact 15, the attraction coil 4, the transistor 30, and the starter motor form a first connection circuit.
The fixed contact 17B and the second fixed contact 17A1 of the starter motor form a second connection circuit.

Next, the operation of the above configuration will be explained.

First, by closing the starter switch 23, power is supplied from the battery 22 to the holding coil 1, and the holding coil 1 is excited. As a result, the yoke 8, the fixed core 7 and the first. Magnetic flux flows through the magnetic circuit formed by the second movable core 2.5, and an electromagnetic attractive force is generated between the first and second movable cores 2, 5 and the fixed core 7. At this time, the first movable iron core 2 has a relatively thin cylindrical shape and only drives the first movable contact 3, so
The overall inertial weight is relatively light, and the gap between the first movable core 2 and the fixed core 7 is relatively small, so a large electromagnetic attraction force can be obtained. It gets sucked in. However, the second movable iron core 5
5A is fixed at its center, and it is necessary to drive not only the second movable contact 6 but also the one-way clutch 26 and pinion 25 via the lever 24, so the overall inertial weight is is relatively heavy, and furthermore, the gap between the second movable core 5 and the fixed core 7 is relatively large, so that only a small electromagnetic attraction force can be obtained. Never.

Therefore, the first movable iron core 2 is connected to the first return spring 1.
The fixed iron core 7 is fixed by electromagnetic attraction force against the spring force of 4.
When the first movable contact 3 is attracted to the side, the first movable contact 3 moves the first fixed contact 15 and a portion 17 of the third fixed contact 17B.
b and the auxiliary circuit is closed. As a result, a current supply circuit to the attraction coil 4 is formed, and the attraction coil 4 is excited, and the yoke 8, the fixed iron core 7, and the first . Second
A larger and sufficient magnetic flux flows through the magnetic circuit formed by the movable core 2.5, and a sufficiently large electromagnetic attraction force is generated between the second movable core 5 and the fixed core 7.

As a result, the second movable core 5 is attracted toward the fixed core 7 by electromagnetic attraction force against the spring force of the second return spring 13, and in response, the second movable contact 6 is moved toward the second movable core 7. The second connection circuit is closed by contacting the third fixed contacts 17A and 17B. As a result, a current supply circuit to the starter motor is formed, and the armature 27 rotates, and the rotation of the armature 27 is transmitted from the armature shaft to the pinion 25 via the one-way clutch 26 spline-coupled to the armature shaft, and the pinion 25 While rotating, both ends of the attraction coil 4 are short-circuited (to the same potential),
Both movable cores 2 and 5 are attracted to and held by the fixed core 7 only by the electromagnetic attraction force generated by the magnetic flux of the holding coil 1. Further, in response to the second movable iron core 5, the one-way clutch 26 and pinion 25 are pushed out via the lever 24, and the pinion 25 meshes with a ring gear (not shown) of the internal combustion engine to start the internal combustion engine.

In this way, when the starting of the internal combustion engine is completed, when the starter switch 23 is opened, the power to the holding coil 1 is cut off, and the spring force of each return spring 13.14 causes both movable iron cores 2.5 returns to its original position, both rotating contacts 3 and 6 are separated from each fixed contact 15.17A and 17B, and pinion 25 and one-way clutch 2
6 also returns to its original position.

Here, if the second movable contact 6 opens before the first movable contact 3, the attraction coil 4 is re-energized, the second movable core 5 is again attracted to the fixed core 7, and the second There is a possibility that the movable contact 6 may be welded due to the chattering phenomenon. However, in order to avoid being restricted by the second movable core 5 when the first movable core 2 returns, the first movable core 2 has a cylindrical shape with both ends open. As a result, the first movable iron core 2 can freely move in the axial direction on the second movable iron core 5, so that even when the starter switch 23 is opened, the first movable contact 3 is connected to the second movable contact. 6, for example, the first and second return springs 14.1
It can be easily set by adjusting the spring force in step 3. Here, the first. A sleeve may be inserted between the second movable cores 2 and 5 to reduce mutual sliding loss. In addition, the first movable iron core 2 side is connected to the second movable iron core 1 as described above.
The overall inertia weight is light compared to the iron core 5 side,
When the starter switch 23 is opened, it also tends to return earlier than the second movable iron core 5, so it is not always the case that the first
．． It is not necessary to determine the spring force of the second spring 14.13 by taking into account the order of opening and closing of the two pivot contacts 3.6.

Also, when the first movable iron core 2 returns, the first movable iron core 2
The non-operating position of the first movable iron core 2 is regulated by the end of the washer 12 coming into contact with the inner extension of the washer 12.
It is relieved by the contraction of .

Furthermore, since the first movable core 2 only needs to drive the first movable contact 3, and therefore the first movable core 2 only needs to move a shorter distance than the second movable core 5, the holding coil 1
It is possible to use a small one as a.

Furthermore, the first. Since the second movable contacts 3 and 6 are arranged in parallel within the contact chamber 11, the axis distance of the magnetic switch can be further shortened, and the first movable contacts 3 and 6 can be arranged in parallel within the contact chamber 11. By commonly using the terminal of the positive electrode side fixed contact 17B of the battery 22 that the second movable contacts 3 and 6 come into contact with, the number of parts can be reduced.

Further, the first fixed contact 15 also has a reduced number of parts by integrally forming the contact surface 15a and the cylindrical caulking part 1jb, and inserting and connecting the lead wire 4a of the attraction coil 4 into the caulking part 15b. Moreover, a fixed contact with good assemblability can be obtained.

Then, as shown in FIG. 2, the second movable contact 6 is connected to the second. Even if there is poor continuity with the third fixed contacts 17A and 17B, turning off the starter switch 23 will cut off the current to the holding coil l, and the transistor 30 will also turn off, cutting off the current to the attraction coil 4. death,
Energization to the starter motor can be reliably cut off.

Further, even if the second movable iron core has a movement failure and does not move, the power to the starter motor can be reliably cut off in the same way as described above.

FIG. 11 shows the main part configuration of a second embodiment of the present invention, in which the entire first movable iron core 2 is housed in the switch yoke 8 and the washer 12 is omitted compared to the first embodiment. , one end of the second return spring 13 is brought into direct contact with the yoke 8, and a step 10a is formed on the sleeve 10 for regulating the position of the first movable iron core 2 when it returns. 1. The outer peripheries of the second movable iron cores 2.5 are each slidably supported.

In this case, since the 13th second movable cores 2 and 5 are each supported by the sleeve 10, the 13th. The gear between the second movable cores 2 and 5 may have a resistance of 0.1 va or more to minimize mutual sliding loss.

FIG. 12 shows the configuration of main parts of a third embodiment of the present invention. It is arranged between the iron core 5 and the fixed iron core 7.

FIG. 13 and FIG. 14 show the configuration of main parts of a fourth embodiment of the present invention, in which the tip of the cylindrical portion 15b of the first fixed contact 15 is closed, and the cylindrical portion 15b is covered. 1
At the same time as caulking and fixing to 6, the lead wire 4a of the suction coil 4
It is fixed by caulking and does not require soldering.

The 15th FEJ schematically shows the fifth embodiment of the present invention, and has one end connected to the starter switch 23 and the other end connected to the base of the transistor 30 via a resistor 31.
The collector is connected to the attraction coil 4, and the emitter is connected to the second fixed contact 17A.

Further, the present invention can be applied to other magnetic switches than the above-mentioned magnetic switches.

【Effect of the invention〕

As described above, in the present invention, since the transistor that turns on when the starter switch is closed is connected to the second connection circuit via one end of the attraction coil, the collector, and the emitter, the conduction of the second movable contact is reduced. Even if there is a defect or the second movable core does not move, opening the starter switch turns off the transistor, cuts off the current to the attraction coil, and reliably cuts off the current to the starter motor. It has the excellent effect of being able to

[Brief explanation of drawings]

Figures 1 and 2 are configuration diagrams schematically showing the overall configuration when the switch shown in Figure 3 is combined with a starter motor when it is not activated and when the second movable contact has poor conduction, respectively; Figure 3; 4 is a longitudinal cross-sectional view showing the first embodiment of the switch of the present invention, FIG. 4 is a cross-sectional view taken along line A-A shown in FIG. 1, and FIG. 5 is a cross-sectional view taken along line B-B shown in FIG. A top view, FIGS. 6 and 7 are a perspective view and a vertical sectional view showing the surrounding structure of the first movable contact portion in the above embodiment, FIG. 8 is a perspective view showing the fixed core in the above embodiment, and FIG. Figure and 1st
Fig. 0 is a vertical sectional view showing the first movable contact and its surrounding structure in the above embodiment, and Figs. 11 and 12 are longitudinal sectional views showing the main structure of the second and third embodiments of the switch of the present invention, respectively. 13 and 14 are vertical cross-sectional views showing the first movable contact and its surrounding structure in the fourth embodiment of the switch of the present invention, and FIG. 15 is a longitudinal sectional view of the fifth embodiment of the switch of the present invention. Start switch. FIG. 2 is a configuration diagram schematically showing the overall configuration when combined with a motor. 1... Holding coil, 2... First movable iron core, 3...
・First movable contact, 4... Attraction coil, 5... Second
movable iron core, 6... second movable contact, 13.14...
- 2nd degree first return spring, 15... first fixed contact, 17A, 17B... second. third fixed contact, 2
3...Starter switch, 27.28...Starter motor armature and field coil, 25...Pinion, 30...Transistor.

Claims (1)

[Claims] A holding coil that is energized when the starter switch is closed, a first movable iron core that is attracted when the holding coil is energized, and a first connection circuit that responds to the movement of the first movable iron core. a first movable contact that closes the
an attraction coil that is excited when the first connection circuit is closed; a second movable iron core that is attracted when the attraction coil is excited to mesh the pinion with the ring gear of the internal combustion engine; a second movable contact that closes a second connection circuit in response to movement of the second movable iron core;
By closing this second connection circuit, the starter motor is energized, the first and second return springs for returning the first and second movable cores to their original positions, and the starter switch are activated. When closed, it turns on and
A magnet switch for a starter, comprising a transistor connected to the second connection circuit through one end of the attraction coil, a collector, and an emitter.