JP6229462B2 - Electromagnetic solenoid device for starter - Google Patents

Description

  The present invention relates to an electromagnetic solenoid device for a starter having a first solenoid for pushing a pinion of a starter to the ring gear side, and a second solenoid for intermittently energizing a motor current.

  As an electromagnetic solenoid device used for a starter in which a pinion shaft having a pinion and an armature shaft of a motor are arranged in parallel as a conventional technology, an electromagnetic solenoid device including two solenoids called a tandem solenoid type is disclosed. .

  This electromagnetic solenoid device includes a first solenoid that pushes the pinion to the ring gear of the engine, and a second solenoid that is provided on the same line as the pinion and that opens and closes the main contact to intermittently supply current to the motor. The extrusion timing and the motor start timing can be controlled independently. For this reason, it is an electromagnetic solenoid device suitable for the starting device of the idling stop system.

  In Patent Document 1, a first solenoid and a second solenoid are arranged side by side in the axial direction, and magnetism of the first solenoid and the second solenoid is provided between the coil of the first solenoid and the coil of the second solenoid. An electromagnetic solenoid device is described in which a core forming part of a circuit is arranged.

Here, the flow of magnetic flux in the first solenoid SL1 is shown in FIG.
The core that faces the plunger 101 of the first solenoid SL1 on one end side in the axial direction is called a first core 102, and the core between the coil 103 of the first solenoid SL1 and the coil 104 of the second solenoid SL2 is the second core 105. Call. The magnetic circuit formed by energizing the first solenoid SL1 moves the plunger 101 to one end side in the axial direction, and the movement of the plunger 101 pushes out a pinion (not shown) arranged on one end side in the axial direction. .

The sliding part 101a of the plunger 101 enters the inner periphery of the second core 105 when the coil is not energized. When the coil 103 is energized, it is generated by energizing the coil 103 as shown by the arrow in FIG. Magnetic flux flows from the second core 105 to the plunger 101.
That is, the magnetic circuit is formed by the first core 102, the second core 105, the plunger 101, and the core stationery 106 that magnetically connects the first core 102 and the second core 105.

However, in the conventional electromagnetic solenoid device, a good magnetic circuit is formed until the plunger 101 reaches the maximum advance in the first solenoid SL1 (when the plunger 101 reaches the maximum movement position when moving toward the one end side in the axial direction). There was no consideration of the means.
That is, in the conventional electromagnetic solenoid device, as shown in FIG. 6, when the plunger 101 is at the maximum advance, the sliding portion 101 a comes out of the second core 105, and the second core 105 and the sliding portion 101 a are in the radial direction. They will not face each other. For this reason, it is difficult for the magnetic flux to flow from the second core 105 to the plunger 101, and there is a possibility that the attractive force when the plunger 101 is moved to one end in the axial direction is reduced.

JP 2012-225189 A

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a first solenoid for pinion extrusion of a starter electromagnetic solenoid device having two solenoids at the time of maximum advancement of the plunger. It is to reliably form a magnetic circuit.

The electromagnetic solenoid device for a starter according to the present invention is used in a starter that starts the engine by transmitting the rotational force of the motor to a pinion that meshes with the ring gear of the engine.
The starter electromagnetic solenoid device includes a first solenoid and a second solenoid.

  The first solenoid has a first plunger that moves in the first coil toward one end in the axial direction by a magnetic force generated by energizing the first coil, and a part of the magnetic circuit at one end in the axial direction of the first plunger. And a first core to be formed. Then, the pinion is moved to one end in the axial direction by the movement of the first plunger toward the one end in the axial direction, and pushed out toward the ring gear.

The second solenoid is arranged coaxially with the first solenoid on the other axial end side of the first solenoid.
The second solenoid opens and closes the main contact connected to the power supply circuit of the starter motor by using the magnetic force generated by energizing the second coil.

The electromagnetic solenoid device for a starter is arranged between the first coil and the second coil, and has a cylindrical second core shared by the first solenoid and the second solenoid as a part of the magnetic circuit. Prepare.
The first plunger has a sliding portion that slides on the inner periphery of the first coil and enters the inner periphery of the second core when the first coil is not energized.
Even when the first plunger moves forward to the maximum movement position on the one end side in the axial direction, the sliding portion enters the inner circumference of the second core.

Furthermore, the electromagnetic solenoid device for a starter includes an annular elastic member that is disposed between the first coil and the second core and presses the first coil in the axial direction. The second core has a projecting portion that projects in an annular shape on one end side in the axial direction so as to be disposed between the inner periphery of the elastic member and the outer periphery of the first plunger. And the sliding part has entered into the inner periphery of the protrusion part at the time of maximum advance.
According to this, even at the time of the maximum advancement of the first plunger, the sliding portion and the second core oppose each other in the radial direction, so that the magnetic flux flows from the second core to the sliding portion. Therefore, the magnetic circuit can be reliably formed until the maximum advance of the first plunger.

It is sectional drawing of an electromagnetic solenoid apparatus (Example). It is sectional drawing of a starter (Example). It is the top view seen from the axial direction other end side of the starter (Example). It is sectional drawing of the electromagnetic solenoid apparatus at the time of maximum advance (Example). It is sectional drawing of an electromagnetic solenoid apparatus (conventional example). It is sectional drawing of the electromagnetic solenoid apparatus at the time of maximum advance (conventional example).

  The mode for carrying out the present invention will be described in detail with reference to the following examples.

〔Example〕
[Configuration of Example]
The structure of an Example is demonstrated using FIGS.
In the embodiment, an example will be described in which a tandem solenoid type electromagnetic solenoid device 2 is adopted for the deceleration type starter 1.
In addition, sectional drawing of the electromagnetic solenoid apparatus 2 in FIG.1 and FIG.2 is IOI sectional drawing of FIG.

  As shown in FIG. 2, the decelerating starter 1 is supported on a motor 3 that generates a rotational force, a pinion shaft 5 that is arranged in parallel with the armature shaft 4 of the motor 3, and an outer periphery of the pinion shaft 5. The pinion 6 that rotates together with the pinion shaft 5, the speed reduction device (described later) that reduces the rotational speed of the motor 3 and amplifies the drive torque, and the drive torque amplified by this speed reduction device is applied to the pinion shaft 5. It comprises a clutch 7 for transmission and the electromagnetic solenoid device 2 of the present invention disposed on the same axis as the pinion shaft 5.

The motor 3 is disposed on the outer circumference of the commutator 8, an electromagnet field (described below) that forms a magnetic field, an armature 9 having a commutator 8 on the rear end side shaft of the armature shaft 4, and the like. This is a known commutator motor composed of a brush 10 and the like.
The electromagnet field forms a magnetic circuit, and a field magnetic pole 13 fixed by a screw 12 to the inner periphery of the yoke 11 that also serves as a housing of the motor 3, and a rectangular wire wound around the field magnetic pole 13. The field coil 14 is configured. Instead of the electromagnet field, a permanent magnet field in which a plurality of permanent magnets are arranged on the inner periphery of the yoke 11 can be adopted.

The pinion shaft 5 is inserted into the inner periphery of a spline tube 15 to be described later and is helically splined. The pinion shaft 5 is provided so as to be movable while rotating in the axial direction (the left-right direction in the drawing) with respect to the spline tube 15.
1 and 2, the left side in the axial direction including the pinion shaft 5 and the electromagnetic solenoid device 2 is referred to as one axial end side, and the right side in the drawing is referred to as the other axial end side. Note that the pinion shaft 5 moves to one end in the axial direction, so that the pinion 6 meshes with the ring gear G.

  The pinion shaft 5 is formed with a hole recessed from the end surface on the other end side in the axial direction toward one end side in the axial direction, and a steel ball 16 is disposed in the hole.

  The pinion 6 is supported by direct spline fitting on the outer periphery of the pinion shaft 5 protruding from the end surface on the one end side in the axial direction of the spline tube 15, and by a pinion spring 17 disposed between the pinion shaft 5 and the pinion 6. It is pressed against one axial end surface of the spline tube 15.

  The end of the spline tube 15 on one end side in the axial direction is rotatably supported by the starter housing 19 via the ball bearing 18, and the end on the other end side in the axial direction is rotatable on the center case 21 via the ball bearing 20. It is supported by. The center case 21 is disposed adjacent to the other axial end side of the starter housing 19.

  As shown in FIG. 2, the reduction gear includes a drive gear 23 formed at the end of the armature shaft 4 on the side opposite to the commutator, an idle gear 24 that meshes with the drive gear 23, and a clutch that meshes with the idle gear 24. The gear train is composed of a gear 25.

  The clutch 7 is, for example, a roller type one-way clutch, a clutch outer 7a that forms a plurality of cam surfaces on the inner periphery, and a clutch inner (described below) disposed on the inner periphery side of the clutch outer 7a. The roller 7b is disposed between the cam surface of the clutch outer 7a and the outer peripheral surface of the clutch inner, and a spring 7c that urges the roller 7b toward the cam surface.

The rotational driving force of the motor 3 is transmitted to the clutch outer 7a through the clutch gear 25.
The clutch inner is formed by the spline tube 15 described above. That is, the spline tube 15 also serves as a clutch inner.
The roller 7b transmits the rotation of the clutch outer 7a to the clutch inner (spline tube 15), and interrupts the power transmission from the clutch inner to the clutch outer 7a.

Next, the configuration of the electromagnetic solenoid device 2 will be described mainly with reference to FIG.
The electromagnetic solenoid device 2 includes a first solenoid (hereinafter referred to as a solenoid SL1) and a second solenoid (hereinafter referred to as a solenoid SL2) arranged coaxially with the pinion shaft 5 on the other axial end side of the pinion 6. Is provided.
The solenoid SL1 is a solenoid that pushes the pinion shaft 5 toward one end in the axial direction using the attractive force of the electromagnet.
The solenoid SL2 is a solenoid that opens and closes a main contact (described later) connected to the power supply circuit of the motor 3.

As shown in FIG. 1, the solenoid SL <b> 1 and the solenoid SL <b> 2 are arranged side by side in series in the axial direction (left-right direction in the drawing), and are housed integrally in the switch case 28.
The switch case 28 has a metal frame 28a provided integrally with the center case 21, a resin frame 28b connected to the other axial end of the metal frame 28a, and an opening on the other axial end of the resin frame 28b. The metal end frame 28c is closed.

  The solenoid SL2 is coaxially arranged on the other axial end side of the solenoid SL1, and the operation direction of the solenoid SL1 and the operation direction of the solenoid SL2 are set in the same direction.

(Description of solenoid SL1)
As shown in FIG. 1, the solenoid SL1 includes an SL1 coil 35 (first coil), an SL1 plunger 36 (first plunger), a first core 37, a second core 38, a shaft 39, a return spring 40, and a drive spring. 41 and the like.

The SL1 coil 35 forms an electromagnet when energized.
The SL1 plunger 36 moves the inner circumference of the SL1 coil 35 in the axial direction (left-right direction in the drawing), and moves to one end side in the axial direction by energizing the SL1 coil 35.
The first core 37 is a core that forms part of the magnetic circuit on one axial end side of the SL1 plunger 36.
The second core 38 forms a part of the magnetic circuit of the solenoid SL2 and also forms a part of the magnetic circuit of the solenoid SL1.

The shaft 39 transmits the movement of the SL1 plunger 36 to the pinion shaft 5 via the steel ball 16.
The return spring 40 pushes back the SL1 plunger 36 when the attractive force of the electromagnet decreases.
The drive spring 41 stores a reaction force for pushing the pinion 6 into the engine ring gear G.
The details will be described below.

  The SL1 coil 35 is configured, for example, by winding an insulation-coated copper wire around a resin bobbin 42. A cylindrical sleeve 43 made of nonmagnetic metal (for example, stainless steel) for guiding the movement of the SL1 plunger 36 is inserted into the inner periphery of the bobbin 42.

  The cylindrical sleeve 43 protrudes to the other axial end side from the other axial end of the SL1 coil 35.

  The SL1 plunger 36 is provided with a sliding portion 36a that slides on the inner circumference of the SL1 coil 35 (that is, the inner circumference of the cylindrical sleeve 43), and a smaller diameter than the sliding portion 36a on the other axial end side of the sliding portion 36a. And a small diameter portion 36b.

  Further, the SL1 plunger 36 is formed with a hollow hole 44 that penetrates the central portion in the radial direction in the longitudinal direction (left-right direction in FIG. 1), and a small diameter with a small hole diameter formed at one axial end side of the hollow hole 44. It has a hole 44a.

The first core 37 includes an SL1 adsorption core 37a and a core plate 37b.
The SL1 adsorbing core 37a is a portion that is magnetized by an electromagnet and adsorbs the SL1 plunger 36. The SL1 adsorbing core 37a is provided in an annular shape in which a central portion in the radial direction opens in a cylindrical shape. It is inserted in the circumference and is arranged to face the SL1 plunger 36 in the axial direction.

  The core plate 37b is caulked and fixed to the attracting core 37a and is magnetically coupled. As shown in FIG. 1, the core plate 37b is in contact with the bottom surface of the metal frame 28a and is restricted from moving toward one end in the axial direction. Rotation is restricted.

The second core 38 has an SL2 adsorption core 38a and a magnetic plate 38b.
The SL2 adsorbing core 38a has a cylindrical portion 38c, a flange portion 38d formed to have a larger outer diameter than the cylindrical portion 38c on one axial end side of the cylindrical portion 38c, and a radial direction on the other axial end of the cylindrical portion 38c. It has an inner collar portion 38e provided to project inward.

The SL2 adsorption core 38a is attached to the outer periphery of the other end in the axial direction of the cylindrical sleeve 43 at the other end in the axial direction of the SL1 coil 35.
An elastic member 46 is disposed between the SL1 coil 35 and the SL2 adsorption core 38a to press and fix the SL1 coil 35 toward the core plate 37b toward one end in the axial direction. The elastic member 46 has an annular shape surrounding the outer periphery of the SL1 plunger 36, and is, for example, an annular rubber member or a disc spring.

  When the SL1 coil 35 is not energized, that is, when the SL1 plunger 36 is stopped by being pushed back by the reaction force of the return spring 40, the sliding portion 36a enters the inner periphery of the cylindrical portion 38c as shown in FIG. Yes. A cup-shaped partition member 47 into which the small diameter portion 36b is inserted is fixed to the other axial end side of the SL2 adsorption core 38a. The partition member 47 is formed of a nonmagnetic metal plate.

  The return position of the SL1 plunger 36, that is, the position where the SL1 plunger 36 is pushed back by the reaction force of the return spring 40 and stops when the excitation to the SL1 coil 35 is stopped and the attractive force of the electromagnet is lost. It is regulated by contact with 47.

For example, the magnetic plate 38b is formed by stacking a plurality of steel plates punched in an annular shape by a press, and is mechanically and magnetically coupled to the SL2 adsorption core 38a. Specifically, the magnetic plate 38b is disposed such that one end surface in the axial direction is in contact with the other end surface in the axial direction of the flange portion 38d.
As shown in FIG. 1, the magnetic plate 38b and the core plate 37b are magnetically connected via a core stationery 49 (described later).

  The shaft 39 is assembled to the SL1 plunger 36 through the small diameter hole 44a of the SL1 plunger 36. A flange portion 39a having an outer diameter larger than that of the small-diameter hole portion 44a is provided at the end portion of the shaft 39 that enters the other axial end of the hollow hole 44 from the small-diameter hole portion 44a. Further, one axial end side of the shaft 39 protruding from the hollow hole 44 passes through the inner periphery of the SL1 fixed iron core 37 and protrudes so as to come into contact with the steel ball 16 (see FIG. 2).

(Description of solenoid SL2)
As shown in FIG. 1, the solenoid SL2 includes an SL2 coil 50 (second coil), an SL2 plunger 51, the aforementioned second core 38, a return spring 52, and the like.

The SL2 coil 50 forms an electromagnet when energized.
The SL2 plunger 51 moves the inner circumference of the SL2 coil 50 in the axial direction (left-right direction in the drawing), and moves to one end side in the axial direction by energizing the SL2 coil 50.
The return spring 52 pushes back the SL2 plunger 51 when the attractive force of the electromagnet decreases.

  The SL2 coil 50 is configured, for example, by winding an insulation-coated copper wire around a resin bobbin 53. A cylindrical sleeve 54 made of a non-magnetic metal (for example, stainless steel) for guiding the movement of the SL2 plunger 51 is inserted into the inner periphery of the bobbin 53.

  As shown in FIG. 1, the SL2 plunger 51 is provided in a stepped shape having a step on the radial outer peripheral surface, and is formed with a cylindrical hole 51a that opens to an end surface on one axial end side. The other end of the partition wall member 47 in the axial direction enters the cylindrical hole 51a, and the SL1 plunger 36 and the SL2 plunger 51 overlap in the axial direction when no power is supplied. As a result, the axial dimension of the electromagnetic solenoid device 2 is reduced.

  The SL2 adsorption core 38a is inserted into the inner circumference of one end of the cylindrical sleeve 54 in the axial direction, and faces the SL2 plunger 51 in the axial direction.

  The core stationery 49 is disposed at at least two locations facing each other in the circumferential direction of the SL1 coil 35 and the SL2 coil 50, and an axial piece 49a extending in the axial direction along the outer peripheral surfaces of the SL1 coil 35 and the SL2 coil 50; A radial piece 49b extending radially inward from the other axial end of the axial piece 49a and covering the other axial end surface of the SL2 coil 50.

The main contact opened and closed by the solenoid SL2 is electrically connected between a set of fixed contacts 59 connected to the power supply circuit of the motor 3 via two terminal bolts 57 and 58, and the set of fixed contacts 59. And the movable contact 60 intermittently.
The movable contact 60 abuts on a set of fixed contacts 59 and the fixed contacts 59 are electrically connected to each other through the movable contact 60, whereby the main contact is closed (turned on). The main contact is opened (turned off) by being electrically disconnected between the two fixed contacts 59.

  The two terminal bolts 57 and 58 are a B terminal bolt 57 and an M terminal bolt 58 each having a male screw portion formed on the outer periphery. A battery cable terminal connected to the positive terminal of the battery B is connected to the B terminal bolt 57, and a motor lead terminal connected to the positive brush 10 of the motor 3 is connected to the M terminal bolt 58.

  The set of fixed contacts 59 is provided separately from the B terminal bolt 57 and the M terminal bolt 58, and one fixed contact 59 is electrically connected to the B terminal bolt 57 and the other fixed contact 59 is electrically connected to the M terminal bolt 58. Fixed to connect. The fixed contact 59 is fixed so that the contact surface faces the other end in the axial direction.

As shown in FIG. 1, the movable contact 60 has a plate shape whose axial direction is the thickness direction, and is sandwiched between a resin insulating plate 63 and an insulating bush 64 and held by the SL2 plunger 51. ing.
The movable contact 60 is held so that the contact surface faces one end side in the axial direction, and the movable contact 60 comes into contact with the fixed contact 59 from the other end side in the axial direction.
The movable contact 60 is urged by a contact pressure spring 65 for applying contact pressure when the main contact is closed.

  The return position of the SL2 plunger 51, that is, the position where the SL2 plunger 51 is pushed back by the reaction force of the return spring 52 and stops when the excitation to the SL2 coil 50 is stopped and the attractive force of the electromagnet is lost is shown in FIG. As shown in FIG. 4, the contact is made between the insulating bush 64 and the end frame 28c.

[Features of this embodiment]
According to the electromagnetic solenoid device 2 of the present embodiment, the second core 38 protrudes in an annular shape toward one end in the axial direction so as to be disposed between the inner periphery of the elastic member 46 and the outer periphery of the SL1 plunger 36. 70.
When the SL1 plunger 36 moves to the maximum movement position on the one end side in the axial direction by energizing the SL1 coil 35, the sliding portion 36a enters the inner periphery of the protruding portion 70.

That is, the SL2 adsorbing core 38a has a small-diameter portion 38f whose inner diameter is equal to the cylindrical portion 38c and whose outer diameter is smaller than that of the cylindrical portion 38c on the other axial end side of the flange portion 38d. The small diameter portion 38f is disposed between the inner periphery of the elastic member 46 and the outer periphery of the SL1 plunger 36, and forms the above-described protrusion 70.
The small-diameter portion 38f functions as a portion that supports the inner peripheral surface of the elastic member 46 and is positioned radially inward.

As shown in FIG. 4, the small-diameter portion 38f is in a state in which the other end in the axial direction of the sliding portion 36a is inserted into the inner periphery when the SL1 plunger 36 moves forward to the maximum movement position on one end in the axial direction. The axial dimension is set so that.
That is, when the SL1 plunger 36 is advanced forward, the other end 71 in the axial direction of the sliding portion 36a is closer to the other end in the axial direction than the one end 72 in the axial direction of the small diameter portion 38f, and the sliding portion 36a and the small diameter portion 38f Wrapping in the axial direction.

[Effects of Example]
The flow of magnetic flux in the solenoid SL1 will be described with reference to FIGS.
When the SL1 coil 35 is not energized, that is, when the SL1 plunger 36 is stopped by being pushed back by the reaction force of the return spring 40, the sliding portion 36a enters the inner periphery of the cylindrical portion 38c as shown in FIG. Yes. When the SL1 coil 35 is energized from this state, the magnetic flux generated by the energization of the SL1 coil 35 flows from the second core 38 to the SL1 plunger 36 as shown by the arrow in FIG.
That is, the magnetic circuit is formed by the first core 37, the second core 38, the SL1 plunger 36, and the core stationery 49.

In the present embodiment, when the SL1 plunger 36 is at the maximum advance, the other axial end 71 of the sliding portion 36a is closer to the other axial end than the axial one end 72 of the small diameter portion 38f, and the sliding portion 36a The small diameter portion 38f is wrapped in the axial direction.
According to this, even when the SL1 plunger 36 is at the maximum advance, as shown in FIG. 4, the sliding portion 36a and the small diameter portion 38f (that is, the second core 38) are opposed to each other in the radial direction. Magnetic flux flows to the sliding portion 36a.
Therefore, the magnetic circuit can be reliably formed until the SL1 plunger 36 is fully advanced.
That is, the small diameter portion 38f has a function of forming a part of the magnetic circuit in addition to the function of supporting the elastic member 46.

1 starter, 2 electromagnetic solenoid device, 3 motor, 6 pinion, 35 SL1 coil, 36 SL1 plunger, 36 a sliding portion, 37 first core, 38 second core, 46 elastic member, 50 SL2 coil, G ring gear, SL1 first 1 solenoid, SL2 2nd solenoid

Claims (1)

Used in the starter (1) for starting the engine by transmitting the rotational force of the motor (3) to the pinion (6) meshing with the ring gear (G) of the engine;
A first plunger (36) that moves in the first coil in the axial direction by a magnetic force generated by energization of the first coil (35), and an axial end of the first plunger (36). A first core (37) that forms a part of the magnetic circuit, and the pinion (6) is moved to one end in the axial direction by moving the first plunger (36) toward one end in the axial direction. A first solenoid (SL1) pushed out toward (G);
The first solenoid (SL1) is disposed coaxially with the first solenoid (SL1) on the other axial end side, and uses the magnetic force generated by energization of the second coil (50). 3) a second solenoid (SL2) for opening and closing a main contact connected to the power supply circuit;
Arranged between the first coil (35) and the second coil (50), the first solenoid (SL1) and the second solenoid (SL2) share as part of the magnetic circuit. A cylindrical second core (38),
The first plunger (36) slides on the inner periphery of the first coil (35) and enters the inner periphery of the second core (38) when the first coil (35) is not energized. An electromagnetic solenoid device for a starter having a portion (36a),
Even when the first plunger (36) moves forward to the maximum movement position on one end side in the axial direction, the sliding portion (36a) is in the inner periphery of the second core (38) ,
Furthermore, the electromagnetic solenoid device for the starter is
An annular elastic member (46) disposed between the first coil (35) and the second core (38) and pressing the first coil (35) in the axial direction;
The second core (38) is an annular projecting portion (70) projecting annularly toward one axial end so as to be disposed between the inner periphery of the elastic member 46) and the outer periphery of the first plunger (36). )
The electromagnetic solenoid device for a starter , wherein the sliding portion (36a) is in an inner periphery of the protruding portion (70) at the time of the maximum advancement .

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