JPH03240208A - Electromagnetic solenoid type driving device and magnetic switch of starter - Google Patents

Abstract

PURPOSE:To lessen the ampere turn value for securing the magnetic attraction force by a method wherein solenoid and movable part are divided into two or more sections while the sum of the cavity length of one end movable part and stationary part is specified as the shifting length of the whole movable parts. CONSTITUTION:The title driving device is provided with a magnetic solenoid 21, movable parts 22, a stationary part 20, the movable parts 22 are attracted by magnetism generated by a magnetic circuit formation to one end side of the stationary part 20; when the solenoid electrification is released, the movable parts 22 are reset to the pre-attraction state by a resetting means such as spring, etc.; the solenoid 21 is divided into two or more sections 21A, 21B to be arranged at intervals in the axial direction; and an intermediate magnetic passage 20 is laid between the two solenoids 21A, 21B. On the other hand, the movable parts 22 are divided into multiple numbers corresponding to the numbers of solenoids 21A, 21B; the movable parts 22A, 22B are relatively and movably connected 24 within the range of specific cavity of the mutually movable parts 22A, 22B as well as the shifting length l1 of the whole movable parts 22 is also divided so that the divided length may correspond to the cavity length of one end 20a of the stationary part.the nearest movable part and the cavity length of the mutually movable part 22A, 22B.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a solenoid that reciprocates a movable element by the magnetic attraction force when the solenoid is energized and the force of a return means (such as a return spring) when the magnetic attraction is released. This invention relates to a waste disposal device and a magnetic switch for a starter using the same.

[Conventional technology]

Solenoid-type tilting devices are used as drive sources for magnetic switches and various other actuators.

FIG. 7 shows a conventional example in which this type of solenoid drive device is used as a magnetic switch for an engine starter.

The magnetic switch 2 in FIG. 7 is mounted on the outside of the main body of the stern motor unit 1, and its free moving part is connected to a cylindrical stator (fixed iron core) 3. Electromagnetic solenoid 4. Return spring 5. It is composed of a mover (movable iron piece) 6, etc.

A shift lever 8 for moving the pinion 7 in the axial direction is connected to one end of the movable element 6, and a rond 10 with a movable switch 9 is connected to the other end. Pinion 7 is
It is connected to a pinion shaft 14 via an overrunning clutch 13.

The output of the motor section 1 is transmitted to the pinion shaft 14 via a speed reduction mechanism.

With this configuration, when the key switch is turned on, the solenoid 4 is energized, the stator 3 and the mover 6 form a magnetic circuit, and the force of the spring 5 causes the mover 6 to act due to the magnetic attraction force. It resists and moves in the direction of arrow X'. Due to this movement, the shift lever 8 pushes the pinion 7 toward the ring gear 12, and the pinion 7 and ring gear 12 mesh with each other.
At the same time, the movable contact 9 closes the fixed contact 11, the motor 1 rotates, the pinion 7 and the ring gear 12 rotate, and the engine starts.

In addition, as a conventional example of a solenoid type active device, as disclosed in Japanese Patent Application Laid-Open No. 60-53004, a plurality of solenoids are arranged and fixed in series in the axial direction.
In response to this, a plurality of movers are provided and these movers are connected in a skewer shape by a connecting rod to increase the responsiveness of the electromagnetic solenoid.
A suction stroke is achieved by arranging multiple sets of stators, solenoids, and movers in multiple stages, and setting the gap lengths between each stator and mover to be different, and staggering the suction timing of each mover to the stator. Techniques have been proposed to obtain high suction power even when the

[Problem to be solved by the invention]

In the above prior art, for example, the pinion 7 shown in FIG.
The magnetic attraction force required for meshing with the ring gear 12 is F□ (kg), and the number of coil turns of the solenoid 4 is N1 (
(turn), the flowing current is I (ampere), and the distance (gap length) that the mover 6 moves due to magnetic attraction is Q.

The relational expression holds true.

That is, since the magnetic attraction force F1 is inversely proportional to the square of the air gap length Q□, in order to obtain the same F4 by reducing N, it is necessary to reduce Q□'.

FIG. 8 shows the relationship between gap length and suction force.

However, the distance between the ring gear 12 and the pinion 7, and the moving distance of other driven objects driven by this type of actuator, must be maintained at a necessary moving distance due to design considerations, and the gap length Q1 must be kept longer than necessary. There was a constraint that it could not be made smaller. Therefore, it is difficult to reduce the size and weight of the entire device by reducing the number of windings of the solenoid, for example.

Regarding this point, the technology disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 60-53004 uses a plurality of solenoids in consideration of high response, and the theme is different from the problem of reducing N. Furthermore, in the conventional technology disclosed in JP-A No. 62-290109, a high suction force can be obtained when the suction stroke is large, but as mentioned above, multiple sets of solenoids, stators, and movers are used. Because they are arranged in multiple stages, the total number of parts is large, and space must be secured for each set of solenoid, stator, and mover assembly, which tends to make the device bulky.

The present invention has been made in view of the above points, and its purpose is to
1) Within the constraints of ut, it is possible to maintain the same magnetic attraction force F□ as before while making N and I smaller than before, and,
An object of the present invention is to provide a solenoid drive device and a starter magnetic switch that can be made smaller and lighter.

[Means to solve the problem]

The above objectives are distantly related as follows.

The first problem solving means relates to a solenoid drive device,
The contents will be explained with reference to the reference numerals used in the principle diagram of FIG.

That is, the present invention includes an electromagnetic solenoid 21.

The movable element 22 and the stator 20 form a magnetic circuit through the magnetic flux generated when the solenoid is energized, and the magnetic circuit is formed to magnetically attract the movable element 22 to one end of the stator, and when the solenoid is de-energized, the force of a returning means such as a spring is applied. In the drive device that returns the movable element 22 to the state before suction, the electromagnetic solenoid 21 is divided into two or more parts, and these solenoids 21A and 2LB are arranged at intervals in the axial direction to form the solenoid 21A.

An intermediate magnetic path 20', which becomes a part of the stator 20, is interposed between 21B and 21B.

On the other hand, the movable element 22 is divided into a plurality of parts according to the number of solenoids 21A and 21B, and these movable elements 22A and 22B are connected 24 so as to be relatively movable within a predetermined gap, and the entire movable element 22 is The moving distance Q1 during magnetic attraction is also divided, and these divided distances are calculated as the gap length between one end of the stator 20a and the nearest movable element 22A when the solenoid is not energized, and the gap length between the movable elements 22A and 22B. When each solenoid 22A, 22B is energized, the intermediate magnetic path 2
0' and the movers 22A and 22B form magnetic circuits G1 and G2 for each solenoid 21A and 21B.

The second problem solving method is the first one! The contents of a starter magnetic switch to which the means for solving problem I is applied will be explained with reference to the reference numerals of the embodiment shown in FIG.

In other words, one problem-solving means is that a pinion 34 is slidably fitted in the axial direction via an overrunning clutch 36 to one end of a pinion shaft 32 to which the output of a motor section 30 is transmitted, as shown in FIG. In this starter, a cylindrical stator 20 made of a magnetic material is fixedly arranged on the outside of the pinion shaft 32 so as to be coaxial with the pinion shaft 32 at a rear position of the overrunning clutch 36, and the outer periphery of the stator 20 is The electromagnetic solenoid 21 is divided into two or more parts and installed in parallel in the axial direction, and an intermediate magnetic path 20' which becomes a part of the stator 20 is interposed between these solenoids 21A and 21B, so that the stator 20 and On the outer periphery of solenoids 21A and 21B,
A movable element 22 that forms a magnetic circuit together with the stator 2o when the solenoid is energized is fitted so as to be slidable in the axial direction, and the movable element 22 is divided in the axial direction according to the number of solenoids 2IA and 21B. It is composed of an assembly in which 22A and 22B are connected to each other so that they can move relative to each other within a predetermined gap.On the other hand, the moving distance of the entire movable element 22 during magnetic attraction is also divided, and these divided distances are divided into solenoid An overrunning clutch 36 is provided on the inner periphery of the stator 20, corresponding to the gap length between one end of the stator 20a and the movable element 22A closest to it and the gap length between the movable elements 22A and 22B.
The clutch outer extension 36b is inserted in the axial direction by extending the clutch outer 36a, and the clutch outer extension 36b is engaged with the rearmost movable member 22B so as to be able to move together in the axial direction. A movable contact 43 of the starter motor is disposed in a part of the last movable element 22B.

[Effect]

Function of the first problem solving means...Solenoid 21A.

When 2113 is energized, the intermediate magnetic path 20' and mover 22A
, 22B, the stator 20. intermediate magnetic path 20
A magnetic circuit G1 that mainly passes the magnetic flux generated by the solenoid 21A is formed between the stator 20.' and the movable element 22A. A magnetic circuit G2 that mainly passes the magnetic flux generated by the solenoid 2↓B is formed between the intermediate magnetic path 20' and the connected movers 22A and 22B. Note that the magnetic circuit Gl passes through the intermediate magnetic path 20'.

If the directionality of G2 is opposite to each other as shown in Figure 1,
In reality, the magnetic fluxes cancel each other at the position of the intermediate magnetic path 20', so the portion where they cancel each other is shown by a virtual line (dotted line).

When the magnetic circuits Gl and G2 are formed as described above, the movable element 22A is magnetically attracted in the direction of the arrow X by the magnetic attraction force of the magnetic circuit G1 (magnetic attraction force of the solenoid 21A).
At the same time, the movers 22A and 22B are attracted to each other by the magnetic attraction force of the magnetic circuit G1 (magnetic attraction force of the solenoid 21B), and finally one end of the stator 20a.
The gap between the movers 22A and the gap between the movers 22A and 22B are eliminated.

In the present invention, one end of the stator 20a when the solenoid is de-energized.
The sum of the gap length between the movable elements 22A and the gap length between the movable elements 22A and 22B is made to match the distance mat required for movement of the entire movable element 22.

Therefore, by eliminating each of the above-mentioned gaps, the entire mover 22
If you look at it as follows, it will move by a distance Q1.

Since the respective air gaps are eliminated in each magnetic circuit Gl and G2, the required magnetic attraction force F1 is
, G2 can be understood from the relationship between the gap length and the number of turns of the solenoid.

For example, the gap length between one end of the stator 20a and the mover 22A is Q, /2, and the gap length between the movers 22A and 22B is Q, /2.
, the number of coil turns of the entire solenoid is N2, solenoid 21
The number of turns of A and 21B is N2/2, and the current of each solenoid is ■
, and when compared with that of the conventional method shown in FIG. 7, the following linear relational expression is established.

Rearranging this, we therefore get N2=N,/2. This means that if the solenoid is divided into two parts to obtain the same suction force and the same travel distance as in the past, the total number of turns of the solenoid can be 172 if the electric current conditions are the same. In other words,
With the same number of turns, you can get twice the suction power. Similarly, if it is divided into three parts, it is possible to obtain three times the suction power.

Incidentally, since the movers 22A and 22B attract each other magnetically, the same effect as described above can be achieved even if the magnetic flux generation directions of the magnetic circuits Gl and G2 are set as shown in FIG. In addition, in order to perform the above action, a gap between the movers 22A and 22B,
The ratio of the gap between the movable element 22A and one end of the stator 20a does not necessarily need to be equally divided.

Operation of the second problem-solving means...The mover assembly (divided mover 22A) in the present problem-solving means.

22B connected so as to be relatively movable within the range of a predetermined gap), the operation when the solenoid is energized is performed in the same manner as in the first problem solving means.

When the mover assembly is magnetically attracted (in the direction of arrow X in the drawing), the clutch outer extension 36 engages with it.
In addition, the clutch outer 36° pinion 34 also moves by a distance in the axial direction, and the pinion 34 is pushed into the ring gear 37. At the same time, the movable contact 43 comes into contact with the fixed contact 45, the motor and eventually the pinion rotate, and the engine starts.

In this problem solving means, a magnetic switch (
Since the stator 20 and mover assembly, which are elements of the pinion shift mechanism, are arranged coaxially with the pinion shaft 32, the radial dimension of the entire magnetic switch can be reduced, and the device can be made more compact. Furthermore, since the clutch outer extension part 36b is connected to the movable element 22B through the inside of the stator 20, the magnetic switch can be placed between the overrunning clutch and the motor part, so that the radial dimension of the entire starter can be reduced as shown in FIG. It can be significantly smaller than a starter like this.

〔Example〕

An embodiment of the present invention will be explained with reference to FIGS. 3 to 6. This embodiment is an example in which the present invention is applied to a magnetic switch of a reduction type starter.

Fig. 3 is an exploded perspective view showing some of the parts used in this embodiment, Fig. 4 is a half-cut sectional view of this embodiment, Fig. 5 is its circuit diagram, and Fig. 6 is an explanatory diagram showing the operating state. , in the drawings, the same reference numerals as those used in the principle diagram of the present invention in the drawing 1 indicate the same or common elements.

First, the overall configuration of this embodiment will be explained with reference to FIG.

30 is a motor, and the rotation of the motor is transmitted to the pinion shirt 1-32 via a speed reduction mechanism 31.

A pinion sleeve 35 with a pinion 34 is fitted onto the pinion shaft 32 via a helical spline 33 and an overrunning clutch 36 . 37 is a ring gear on the engine side.

An electromagnetic solenoid drive section 38 serving as a magnetic switch mechanism is attached to the pinion shaft 32.

This solenoid drive section 38 has a structure similar to that of FIG. 1, and is disposed at the rear of the overrunning clutch 36.

The solenoid moving part 38, as shown in detail in FIG.
Cylindrical stator 20, two divided solenoid 21A, 2
1B, divided mover 22A.

22B, a connector 24 that connects these movable elements to each other, a connector 25 that functions to maintain a gap between the movable element 22A and one end 2Oa of the stator, and functions as a stopper.

The stator 20 is a hollow cylindrical iron core, and the pinion shaft 3
It is fixedly arranged on the outside of the pinion shaft 2 so as to be coaxial with the pinion shaft. Solenoids 2LA and 2 are installed on the outer periphery of the stator 20.
1B are arranged at intervals in the axial direction, and the solenoids 21
An intermediate magnetic path 20' that becomes part of the stator 20 between A and 21B
is mediated.

The movers 22A and 22B move the cylindrical mover 2 in the axial direction.
It is divided and connected via a connecting tool 24.

As shown in FIG. 3, the connector 24 has an annular shape and is made of a non-magnetic material such as stainless steel or synthetic resin. A screw 27 is cut on the inner periphery of the rear part of the connector 24, and the connector 24 is threadedly engaged with the movable element 22B. A plurality of claws 24' are arranged at equal pitches in the axial direction on the front peripheral edge of the connector 24.

On the other hand, the connector 25 has a threaded portion 26 formed on its front inner periphery for coupling with one end of the stator 20, and has a plurality of claw portions 25' disposed at its rear portion. Claw portion 24' of connector 24.25
, 25' have the same pitch.

Two types of pawl engagement grooves 28a and 28b extending in the axial direction are formed in alternating rows in the circumferential direction on the outer periphery of the movable element 22A. The pitch of the grooves is set such that the grooves 28b are slidably engaged and engaged with the pawls 25' of the connector 25. The groove 28a has a locking portion 2 for the pawl 24' on one rear end side.
8a' is provided, and the groove 28b has a claw 25 on the front side.
A locking portion 28b' is provided.

That is, by forming such an engagement structure, the mover 2
2A and 22B are connected so as to be relatively movable within a predetermined gap (in this embodiment, the gap length is Q/2) via a connector 24, and the movable element 22A is connected to one end of the stator 20a by the connector 25 so as to be relatively movable within a predetermined gap (Q, gap length of /2).

36a is a clutch outer of the overrunning clutch 36, and a cylindrical extension 36b is provided protruding from the rear thereof. The extension part 36b has an inner diameter somewhat larger than the outer diameter of the pinion shaft 32 and an outer diameter slightly smaller than the inner diameter of the stator 20, and extends between the inner and outer circumferences of the stator 20 and the pinion shaft 32. It is fitted in the condition. The end of the extension portion 36b on the opposite side from the clutch outer 36a is a rear end side wall 39 of the movable element 22B, which is the last end with respect to the magnetic attraction advancing direction.
The inner periphery of the hole 40 engages the circumferential groove 50 provided on the outer periphery of the end of the movable element 22B.
The assembly of 2A and 22B, the clutch outer 36a, and the pinion 34 can move together in the axial direction.

41 is a return spring, one end of which is connected to the stepped portion 5 on the inner circumference of the stator 20.
1, and the other end is received in a recess at one end of the last movable element 22n, thereby urging the movable element assembly to the left in the drawing. The return spring 41 is the clutch outer extension gl! 36
The clutch outer 36a is disposed outside of the clutch outer 36a with a gap therebetween so as not to be affected by the rotation of the clutch outer 36a.

A movable contact 43 is fixedly arranged on the outer periphery of the movable element 22B via a push spring 42. The movable contact 43 is made of a contact material such as copper or brass, and is supported by an insulator 44 so that the movable member 2
It is electrically insulated from 2B. This movable contact 43 comes into contact with the fixed contact 45 of the motor section 1 when the movable element assembly moves in the direction of arrow X (to the right in the drawing) by a distance Q by magnetic attraction.

The fixed contacts 45 are a pair of contacts, and are connected to the electromagnetic solenoid parking part 3.
It is disposed on a non-magnetic insulator 46 outside the 8. The push spring 42 is designed to apply appropriate pressure to the contacts 43, 45 in the state shown in FIG. 6(b).

The insulator 46 is connected to the fixed contact 45 and the solenoid lead wire (
(not shown) are embedded, and these lead wires are led to the outside from the terminal 52.

An air hole 49 is provided in the side wall of one end of the rearmost movable element 22B to reduce air resistance during reciprocating motion of the movable element assembly.

Reference numeral 53 denotes a front bracket of the starter, which is made of a non-magnetic material to reduce leakage of magnetic flux.

Next, the operation of this embodiment will be explained.

When the solenoid is not energized (when the starter is stopped), the mover assembly receives the force of the return spring 41 and is in the state shown in FIG. 6(a).

That is, the force of the return spring 41 is applied to the movable element 22B, the connector 24. The mover 22A and the connector 25 are continuously pulled in the anti-X direction, and the air gap length between the mover 22A and 22B, /2, is pulled through the connector 24 and the end of the mover 22A and the stator are connected via the connector 25. The gap length between 2 Oa and /2 is maintained.

Therefore, the contacts 43 and 45 are separated, and the pinion 34 is also separated from the ring gear 37.

In this state, when the key switch 48 shown in FIG. 5 is turned on, current is supplied from the battery 47 to the solenoid 2.
LA and 21B are energized. By energizing the solenoid, the magnetic circuit G1 of the solenoid 21A is formed between the stator 20, the intermediate magnetic path 20', and the mover 22A, and the magnetic circuit G2 of the solenoid 21B is formed between the stator 20 and the movable element 22A, as described in detail in the invention section.
0, the intermediate magnetic path 20', and the movable elements 22A and 22B.

Then, due to the magnetic attraction force of the magnetic circuit G1, the movable element 22A
moves toward one end of the stator 20a, and at the same time, the movable elements 22A and 22B attract each other due to the magnetic attraction force of the magnetic circuit G2, finally reaching the state shown in FIG. 6(1). That is,
The movable elements 22A and 22B each move in the direction of the arrow X by a gap length of 72 minutes, and the moving distance of the entire movable element becomes equal to 72 minutes. This movement of the movable element causes the pinion 34 to mesh with the ring gear 37, and at the same time, the movable contact 43 engages with the fixed contact 45.
, the stator coil 30a and armature coil of the motor unit 30 are energized to rotate the motor, and the motor output is transmitted to the speed reduction mechanism 31. Pinion shirt l-32, helical spline 33. Overrunning clutch 36. The signal is transmitted to the ring gear 37 of the engine via the pinion 34, and the engine is started.

According to this embodiment, the following effects are achieved.

■The solenoid and the mover are each divided into two parts, and the magnetic circuit of the solenoid 21A attracts the mover 22A to one end of the stator 20a, and the magnetic circuit of the solenoid 21B causes the movers 22A and 22B to be magnetically attracted to each other. Equations 2 and 3 hold true. Therefore, when trying to obtain the same moving distance Ω1 with the same magnetic attraction force as the conventional single solenoid type electromagnetic solenoid mechanism, the solenoid current Under these conditions, the total number of turns of the solenoid can be 172. In other words, if the number of solenoid turns is the same as before, the number of turns is 2.
You can get double the suction power.

Therefore, the solenoid and the entire device can be made smaller and lighter.

■Also, since the electromagnetic solenoid displacement part 38 is arranged between the motor part 30 and the pinion gear 34 so as to be coaxial with the pinion shaft 32, the shaft length is longer than that of a conventional separately installed starter (as shown in Fig. 7). remains almost unchanged, but the dimensions are significantly reduced in the radial direction. Therefore, it is possible to provide a starter with improved output and ease of installation.

■An air hole 49 is provided in the side wall 39 at one end of the last mover 22B.
, the air resistance during movement of the movable element assembly is reduced, ensuring smooth operation of the movable element and, by extension, the starter as a whole.

The present embodiment can also be applied as a drive mechanism for the starter shown in FIG. 7, and can also be applied as a drive source for various actuators other than the starter.

〔Effect of the invention〕

As described above, according to the present invention, in the first problem solving means, the solenoid and the mover are each divided into two or more pieces, and the gap length between the divided movers and one end of the mover and stator are By setting the sum of the air gap lengths as the moving distance of the entire mover, each mover can be magnetically attracted by its own divided solenoid, and as a whole, the same moving distance and magnetic You can get suction power. In addition, since the stator is common and the mover is a single connected assembly, the installation space for each component can be rationalized, and combined with a reduction in the number of turns of the solenoid, the entire drive device can be made smaller and lighter, and the output can be increased. Improvement can be achieved.

Further, according to the second problem-solving means, it is possible to reduce the size and weight of the magnetic switch of the starter, and thus of the entire starter, and to improve the opening efficiency of the magnetic switch.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams showing the operating principle of the present invention,
FIG. 3 is a partially exploded perspective view of a mover assembly used in one embodiment of the present invention, FIG. 4 is a half-cut sectional view showing the overall structure of the starter according to the above embodiment, and FIG. , FIG. 6 is an explanatory diagram showing the operating state of the above embodiment, FIG. 7 is a partially cutaway sectional view showing a conventional example of a starter, and FIG. , is an explanatory diagram showing the relationship between the magnetic attraction force of an electromagnetic solenoid and the gap length. 20... Stator, 20'... Intermediate magnetic path, 21A, 2
1B... Solenoid, 22A, 22B... Mover,
24.25... Connector, 24', 25'... Claw part,
26...Joining portion between the connector and the mover, 27...Joining portion between the stator and the connector, 28a, 281>...Groove for pawl engagement, 28a, 28b'--claw locking portion , 30・
-・Motor section, 32...Pinion shaft, 34...
・Pinion, 35...Pinion sleeve, 36...
Overrunning clutch, 36a... Talatch outer, 36b... Clutch outer extension part, 37... Ring gear, 38... Electromagnetic solenoid waste movement part, 41...
Return spring, 43... Movable contact, 45... Fixed contact,
49...Air hole, G1, G2...Magnetic circuit. Figure 1 (a) Figure 2 20... Stator, 20'... Intermediate magnetic path, noid, 22
A, 22B...Mover, 26...Connection part between the connector and the mover. Connection part with G + , G 2...magnetic circuit 21A
, 21B...Ru 24.25...Connection tool, 27...Groove portion of stator and connection tool Fig. 3, 28a', 28b'-claw locking portion. Figure 4 (a)

Claims (9)

[Claims] 1. Equipped with an electromagnetic solenoid, a mover and a stator that form a magnetic circuit through magnetic flux generated when the solenoid is energized,
In the drive device, the movable element is magnetically attracted to one end side of the stator by forming a magnetic circuit, and when the solenoid is de-energized, the movable element is returned to the state before attraction by the force of a returning means such as a spring. The solenoid is divided into two or more, and these solenoids are arranged at intervals in the axial direction, and an intermediate magnetic path that becomes a part of the stator is interposed between the solenoids. The movable element is divided in the axial direction, and these movable elements are connected to each other so as to be movable relative to each other within a predetermined gap, and the moving distance of the entire movable element during magnetic attraction is also divided. The distance corresponds to the gap length between one end of the stator and the nearest movable element when the solenoid is not energized, and the gap length between the movable element and the earth, respectively, and when each solenoid is energized, the movable part separated from the intermediate magnetic path is An electromagnetic solenoid type drive device characterized in that a magnetic circuit is formed for each solenoid by the presence of a child. 2. In the first aspect, the stator has a cylindrical shape, and the solenoid is disposed on the outer periphery of the stator with an intermediate magnetic path interposed in the axial direction, and the assembly formed by connecting the movable elements to each other is . An electromagnetic solenoid drive device that has a hollow cylindrical shape and is slidably fitted around the stator and the solenoid. 3. In the first or second claim, the connection structure between the movable elements includes a plurality of grooves extending in the axial direction provided on the outer periphery of one of the movable elements at intervals in the circumferential direction, and An annular connector having a pawl portion whose pitch matches that of the groove is coupled to one end, and the pawl portion is slidably engaged with the groove portion, and the movable elements are connected to each other at a predetermined position at one end of these groove portions. An electromagnetic solenoid drive device comprising a locking portion that locks the claw portion when separated by a gap. 4. In any one of claims 1 to 3, one end of the stator on the magnetic attraction side and the movable element closest thereto are connected to each other so as to be relatively movable within a predetermined gap. Solenoid drive device. 5. In a fourth aspect, the connection structure between one end of the stator and the movable element nearest thereto includes a plurality of grooves extending in the axial direction provided on the outer periphery of the movable element at intervals in the circumferential direction; An annular connector having a claw portion whose pitch matches that of the groove is coupled to one end, and the claw portion is slidably engaged with the groove portion, and the movable element is connected to the stator at one end of the groove portion. An electromagnetic solenoid drive device comprising a locking portion that locks the claw portion when separated from one end by a predetermined gap. 6. The electromagnetic solenoid drive device according to claim 4 or 5, wherein the annular connector is made of a non-magnetic material. 7. In any one of claims 1 to 6, the last movable element among the divided movable elements with respect to the direction of movement of magnetic attraction includes a movable contact of a switch and a cover of an actuator. An electromagnetic solenoid drive device in which at least one of the objects to be driven is arranged or coupled. 8. In any one of claims 1 to 7, a spring is used as the return means, and the spring returns the last movable element among the movable elements with respect to the direction of movement of magnetic attraction. Electromagnetic solenoid drive device that energizes force. 9. In a starter in which a pinion is fitted to one end of a pinion shaft through which the output of a motor section is transmitted so as to be slidable in the axial direction via an overrunning clutch, a cylindrical magnetic material is fixed on the outside of the pinion shaft. The stator is fixedly disposed so as to be coaxial with the pinion shaft at a rear position of the overrunning clutch, and two or more electromagnetic solenoids are divided into two or more parts and installed in line in the axial direction on the outer periphery of the stator. An intermediate magnetic path that becomes a part of the stator is interposed between the solenoids, and a movable element that forms a magnetic circuit together with the stator is slidable in the axial direction on the outer periphery of the stator and the solenoid when the solenoid is energized. This movable element is composed of an assembly in which movable elements divided in the axial direction according to the number of solenoids are connected to each other so as to be relatively movable within a predetermined gap; The overall travel distance during magnetic attraction is also divided,
These dividing distances are calculated from one end of the stator when the solenoid is not energized.
This corresponds to the gap length between the nearest movable elements and the gap length between the movable elements, respectively, and the clutch outer of the overrunning clutch is extended on the inner periphery of the stator, and the clutch outer extension part is attached to the shaft. This clutch outer extension is engaged with the rearmost movable element so as to be able to move integrally in the axial direction, and a movable contact of the starter motor is disposed in a part of the rearmost movable element. A starter magnetic switch that is characterized by: