JPS6318182A - Plunger mechanism of magnetic solenoid for starter - Google Patents

Abstract

PURPOSE:To dispense with a hold coil as well as to aim at the promotion of lightweightiness, by making a sleeve engage a receiving part of a plunger with a clock part of a bobbin via a feed part with coil energization at the time of engine starting, holding it at a starting position, and releasing the engagement between them with the coil reenergized. CONSTITUTION:When a pull-in coil 5 is temporarily energized with a starting switch, a guide sleeve 21 is moved in an S direction against a spring 22, then a plunger 10 is displaced against springs 15 and 20, closing an interval between contacts 27 and 28, thus a motor 2 is started. At this time, rearward movement of this guide sleeve 21, a projecting piece 23a of a feed part 23 is slidden rearward along a groove 6d of a lock part 6 of a bobbin 4, a tilting part 24 comes into contact with another tilting part 18a of a receiving part 18 and then it is retreated, while the receiving part 18 has the tilting part 24 engaged with the inside of a feed groove as attending on rotation of a sliding plate 17, and the guide sleeve 21 is rest to its original position by dint of the spring 22. And, when the coil is reenergized after starting, it is engaged with re-retreatment of the guide sleeve 21, that is, a starting position of the plunger 10 is released. Thus, a hold coil becomes unnecessary and miniaturization and lightweight promotion are made attainable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a plunger mechanism for an electromagnetic solenoid for a starter, which has an improved structure for holding the plunger in the starting position when starting an engine, and in particular, for a starter electromagnetic solenoid. This is related to the starter electromagnetic solenoid plunger mechanism, which has been improved to eliminate the need for a bold coil.

[Prior Art] As an electromagnetic solenoid for an automobile starter, the one shown in FIG. 8 has been known.

According to this, as seen in the figure, a coil 100 consists of a pull-in coil PC and a hold coil (C), and a plunger 101 is disposed within this coil 100.

When the key switch 102 is closed when starting the engine, the pull-in coil PC is first energized and the plunger 1 is turned on.
01 moves to the starting position, and the movable contact 103 closes between the fixed contacts 104 and 104. As a result, the starter motor 105 is energized, and the pull-in coil PC
The energization of the hold coil 11C is stopped, and the hold coil 11C is instead energized to continue holding the plunger 101 at the starting position.

In this way, the coil 100 requires the pull-in coil PC and the hold coil HC, and the hold coil HC is actually wound on the pull-in coil PC.

[Problems to be solved by the invention] However, tension is applied to the lead-out portion of the pull-in coil PC due to the winding of the hold coil HC, and the coating of this coil is damaged and insulation is lost, causing a short circuit when photographed from the engine. There is a risk that (shikoat) may occur and malfunction may occur. In addition to these inconveniences, there are the following inconveniences. That is, when the key switch 102 is opened, the hold coil IIc is in a energized state, resulting in power consumption, and heat generation causes adverse ti to the surrounding parts of the coil.

In addition, the pull-in coil PC and the hold coil 14C must have the same number of turns for the operation of the plunger 101, which requires space for the hold coil HC and increases v-acid, which impedes miniaturization and weight reduction. This is a contributing factor.

11II returned to this type of technology, Utility Model Opening 56-776
There is one described in Publication No. 47. This invention was made based on a technical concept completely different from that of this publication, and it is possible to eliminate the need for a conventional hold coil without any loss of function, and to avoid malfunctions caused by short circuits due to poor insulation, reducing power consumption and generating heat. It is an object of the present invention to provide a plunger mechanism for an electromagnetic solenoid for a starter, which can eliminate the adverse effects of the electromagnetic solenoid and which contributes to space saving, size reduction, and weight reduction.

[Means for Solving the Problems] The present invention has a movable contact that is wound around a bobbin having a lock portion on its inner circumferential surface, and is brought into contact with a fixed contact at and after starting the engine. a coil that is energized, a guide sleeve that is provided in the bobbin so as to be movable back and forth in the axial direction and moves when the coil is energized, and a receiving section that moves the guide sleeve backward. and a plunger that is moved in the same direction when the return part engages with the receiving part and connects the output shaft side of the electric motor to the crank side of the engine via a lever, and the plunger is connected to the coil when the engine is started. energization causes the sleeve to engage and hold the receiving portion of the plunger with the locking portion of the bobbin via the feeding portion, and upon re-energizing the coil during startup, the feeding portion of the sleeve engages and holds the receiving portion of the plunger. A configuration is adopted in which the engagement of the bobbin with the lock portion is divided by wt.

[Function] According to the invention configured as described above, when the engine is started, the guide sleeve moves rearward by energizing the coil, and the sending part engages the receiving part of the plunger with the locking part of the bobbin, Hold the plunger at the starting vJ position.

Immediately after the engine starts, the coil is energized and the guide sleeve moves rearward again, and the feeding section releases the receiving section from the locking section, returning the guide sleeve to its original state. It is something that becomes. As a result, the function can be maintained without omission without using the conventional hold coil.

[Effects of the Invention] According to the present invention, the conventional hold coil is not required, there is no loss of function, there is no malfunction caused by short circuits due to poor insulation, and there is no problem with peripheral equipment caused by power consumption or heat generation. To provide a plunger mechanism of an electromagnetic solenoid for a starter, which can eliminate adverse effects and has excellent effects such as reducing the space and weight of a hold coil and contributing to space saving and miniaturization. It is something that can be done.

[Example 1 Embodiments of the present invention will be described below with reference to the drawings.

First, in FIG. 1, 4 is a cylindrical bobbin provided in the frame 3, and a pull-in coil 5 is wound around the outer circumference of the bobbin. 1 is an electromagnetic solenoid attached to a motor 2 as an electric motor, and 3 is a frame of the electromagnetic solenoid 1, as shown in FIG. Regarding the inner circumferential surface of the bobbin 4 described above, (a), (b), (C) and (
As shown in d), a lock portion 6 is provided. This lock portion 6 has three protrusions 6a, 6b extending in the axial direction,
5c as a set, and have substantially the same width dimension and a small thickness rectangular cross section. And the central protrusion 6
The thickness b is set to be smaller than the respective thicknesses of the protrusions 6a16C on both sides.

Three sets of such protrusions 5a, 5b, 5c are formed at equal angular intervals in the circumferential direction, and a groove 66 is formed between them. As shown in FIG. 2(C), the rear end portions of the protrusions 6b and 6C are formed with a continuous inclined portion 7 at a predetermined angle, and the protrusion portion 6a is formed with a continuous slope portion 7 similar to the protrusion portion 6C. An inclined portion 8 is provided. The V-shaped part formed by the cooperation of the inclined part 7 and the protruding part 6a is defined as a lock part 9. Reference numeral 10 denotes a stepped cylindrical plunger, which is arranged to be inserted into the bobbin 4 in the axial direction, and has a washer 1 in the large diameter portion 10a.
A support shaft 12 having a shaft 1 attached thereto is disposed. plunge p1
A washer 13 is attached to the small diameter portion 10b of 0, and a bush 14 is fitted therein. This bushing 14 is connected to an insulating ring 16 by a coil spring 15.
It is constantly biased in the direction of contacting the washer 13 via. A circular sliding plate 17 smaller than the inner diameter of the bobbin 4 is formed on the stepped portion of the plunger 10.
The outer periphery of 7 is marked with figures 3 (a), (b) and (C).
As can be seen, a protrusion-shaped receiving portion 18 located within the groove 6d of the locking portion 6 is integrally formed. This receiving part 1
An inclined portion 18a corresponding to the lock portion 9 of the lock portion 6 is formed at the front end portion of the lock portion 8.

The plunger 10 is urged forward by a coil spring 20 provided between a stepped portion X and a ground plate 19 suspended from the frame 3, as shown in FIG. A sleeve 21 is fitted into the large-diameter portion 10a of the plunger 10 so as to be movable in the axial direction, and has a ring-shaped flange 21a integrally formed at its front end. A coil spring 22 is provided between the flange 21a and the frame 3, and the coil spring 22 is biased so that the flange 21a comes into contact with the washer 11. A feeding portion 23 is formed on the outer periphery of the sleeve 21 . In this feeding section 23, as shown in FIG. are arranged in the circumferential direction at angular intervals of 6 ([) in a connected state that alternately forms an uneven cross-sectional shape, and there are six in total.

In this case, the thickness of the protrusions 23a and 23C is set to be larger than the thickness t of the protrusions 23b and 123d, as shown in FIG. 4(d).

These protruding strips 23a, 23b and protruding strip 2
Each end of 3c and 23d facing the receiving part 18 has a sloped part 24, 25 having an inclination direction that matches the sloped part 18a.
are formed respectively, and have a zigzag shape as a whole as shown in FIG. 4(C). These inclined portions 24 and 25 form a V-shaped gap formed by opening the protruding strips into a space 26. In the stiff state, the sleeve 21 is placed in the bobbin 4, the protruding strip 23a is located within the lock portion 6d with the inclined portion 24 facing the inclined portion 18a of the receiving portion 18, and the protruding strip 23a g23b, 23c, 23d are protrusions 5a
, 5b, and 5c, respectively. 27 is a movable contact attached to the insulating ring 16 as shown in FIG. 1; 28 is a fixed contact fixed to the room 3 side;
0, and the spout is pivoted to the cylinder body 30. This cylindrical body 30 has a helical spline (
(not shown). 31 is a roller clutch as a one-way clutch, 32 is a pinion, 3
3 is a ring gear on the engine crank side. Further, FIG. 6 shows an electrical wiring diagram, and in this figure, 34 is a starting key switch, whose movable contact piece 34a is a fixed contact 34b.
and the rest contact 34C. Note that the number 1000 shown in FIG. 1 is a spring that biases the support shaft 12 in the direction of arrow A.

Next, the operation of the embodiment created as described above will be explained.

To start the engine, the start key switch 34 is operated, and the movable contact piece 34a is brought into contact with the fixed contact 34b and passed through, and comes into contact with the rest contact 34C. After that, move the movable contact piece 34a away from the resting contact 34C and move it to the fixed contact 34b.
Pass it through while making contact with it and return it to its original position. In this case, the contact of the movable contact piece 34a with the fixed contact 34b causes the starting key switch 34 to be temporarily closed during forward and backward movements. First, the pull-in coil 5 is energized by temporarily closing the starting key switch 34. Therefore, the magnetic attraction force generated by the coil 5 causes the guide sleeve 21 to move backward against the coil spring 22, that is, in the direction of the arrow six in FIG. 1, and then the plunger 10 moves in the same direction against the coil spring 15. While moving and displacing, the movable contact 27 becomes the fixed contact 28! 1 contact and the motor 2 is energized. Prior to this energization of the motor 2, since the plunger 10 has moved backward, the rotating lever 29 rotates in the clockwise direction as shown by the arrow Z in FIG. moves in the direction of arrow B in the figure together with the roller clutch 31 and meshes with the ring gear 33.

In this state, the pinion 32 is rotated by the output shaft 3a of the motor 2, and this rotation is transmitted to the ring gear 33 to start the engine.

The operation of the guide sleeve 21, the plunger 10, and the feed section 23 in the bobbin 4 at the time of starting such an engine will be explained with reference to FIGS. 7(a), (b), and (C)-II.
Explain in detail.

Rearward movement of the guide sleeve 21] k: Accompanying feed section 23
The protruding strip 23a slides backward along i6d of the locking part 6 from the rest device shown by the broken line in FIG. In this state, the receiving portion 18 moves back to the position shown in FIG. 7(b). Here, the receiving part 18 slides on the inclined part 24 in the direction of arrow P while the sliding plate 17 rotates, and reaches the inside of the feed groove 26.
It is temporarily held here. From this state, the guide sleeve 21 moves away from the receiving portion 18 and returns to the front due to the biasing force of the coil spring 22, as shown in FIG. 7(C).

Due to dirt, the receiving part 18 further rotates while the sliding plate 17 rotates, and the inclined part 7 of the protrusion part 6C16b in the locking part 6
Slide it in the direction of arrow Q and it will be locked in the feed position 26.

Therefore, the pusher 10 is held at this starting position, the pinion 32 is kept in mesh with the ring gear 33, the fixed contact 28 is kept open by the movable contact 27, and the motor 2 is kept energized. .

Further, after the engine is started, the starting key switch 34 is closed again by the movable contact piece 34a as the starting key switch 34 returns to its original position.
moves backwards again. With this movement, the protruding strip 23a contacts and presses the inclined portion 18a, locking the feeding portion 18@
9 and slides on the inclined portion 8 of the protruding portion 6a of the lock portion 6 while rotating the sliding plate 17. However, the guide sleeve 21 returns to the front,
The sending portion 23t that has slid on the inclined portion 8 of the protruding portion 6a enters the TIA 6d of the locking portion 6, and the coil spring 15.2
It moves forward along the groove 6d with a biasing force of 0 and returns to its original position. This causes the rotation lever 29 to move to the first position.
As shown by counter-arrow Z in the figure, the pinion 32 rotates in the opposite direction to the first direction, and the pinion 32 moves together with the roller clutch 31 via the cylinder 30 in the counter-arrow B direction in the figure, and the ring gear 33 released from the mesh. At the same time, the movable contact 27 moves forward, the contact state of the movable contact 27 with the fixed contact 28 is released, and the energizing circuit of the motor 2 is cut off, so that the motor 2 is de-energized and stopped.

In this way, in the above embodiment, when the engine is started, the receiving part 18 of the plunger 10 is locked by the sending part 23 of the guide sleeve 21 to the hook part 6 of the bobbin 4, and the plunger 10 is held at the starting position. Not only does the original function remain intact even without the use of a hold coil, but unlike conventional systems that require the use of a hold coil, there is no malfunction due to short circuits due to poor insulation, and power consumption is eliminated. In addition to contributing to power savings, it also eliminates the negative effects of heat generation on peripheral equipment, and also eliminates the need for a considerable amount of space and weight for the hold coil, contributing to space savings and miniaturization. It is something to do.

In the above embodiment, the present invention is applied to an engine for an internal expansion engine, but the scope of application is not limited to this, and may be applied to a heavy vehicle equipped with a gas turbine.

Further, in the lock portion 6, the receiving portion 18, and the sending portion 23, the surfaces of the inclined portions may be finely finished so that they can easily slide against each other.

In addition, in the specific implementation, various changes can be made without departing from the gist of the invention, such as the coloring coefficient t of each spring being able to be set appropriately.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, and FIG. 1 is an exploded perspective view of the main parts, and FIG. 2 shows (a), (b), (C), and (d).
) shows a perspective view of the bobbin, a front view of the bobbin, a developed view of the lock part, and a developed view of the protruding part, and (a
), (b) and (C) respectively show a perspective view of the receiving part, a front view of the receiving part and a developed view of the receiving part, and (a>, (b), (C) and (d) of FIG. 4) 5 is a perspective view of the feeding section, a front view of the feeding section, a developed view of the feeding section, and a developed view of the feeding section viewed from a direction different from (C), and FIG. 5 is a partially cutaway front view of the entire feeding section. Figure 6 is an electrical circuit diagram, Figure 7
Figures (a), (b), and (C) are developed views for explaining the operation of the guide sleeve, plunger, and lock portion of the bobbin when the engine is started, and Figure 8 is a [prior art] FIG. 2 is an electric circuit diagram showing the configuration of a conventional electromagnetic solenoid described in the section . In the figure, 1... Electromagnetic solenoid 2... Motor (electric 1) 3a... Output shaft 4... Bobbin 5...
Pull-in coil (coil) 6...Lock part 9.
... [1 groove 10... Plunger 17... Sliding plate 18... Receiving portion 21... Guide sleeve 20
...Coil spring 22...Coil spring 23...Feed section 26...Feed groove

Claims (1)

[Claims] A coil that is wound around a bobbin having a lock portion on its inner circumferential surface and that is instantaneously energized by a movable contact contacting a fixed contact during and after starting the engine, and a feeding portion. and a guide sleeve that is provided in the bobbin so as to be movable back and forth in the axial direction and moves when the coil is energized; and a receiving part, and the feeding part engages with the receiving part as the guide sleeve moves backward. and a plunger that is moved in the same direction when the coils are connected to each other and connects the output shaft side of the electric motor to the crank side of the engine via a lever, and when the coil is energized when the engine is started, the sleeve is moved in the same direction via the feeding section. The receiving portion of the plunger is engaged and held with the locking portion of the bobbin, and the sending portion of the sleeve releases the engagement of the receiving portion of the plunger with the locking portion of the bobbin by re-energizing the coil after startup. A plunger mechanism for an electromagnetic solenoid for a starter, characterized by the following features: