CN107835898B - Magnetic switch and engine starting gear - Google Patents

Abstract

The purpose of the present invention is to provide a kind of electromagnetic switch and engine starting gear that this case that driving starter motor in the state that pinion gear is not pushed out to the position of engagement with ring gear can will be preventive from possible trouble.Magnetic switch (7) of the invention includes fixed contact (212,214), is fixed on shell (217)；Travelling contact (211) is configured to abut with fixed contact (212,214)；First plunger (207) transfers travelling contact (211) towards fixed contact (212,214)；And second plunger (201), the pinion gear being arranged on engine starting gear is transferred, in the case where the feeding amount of the second plunger (201) is specified value situation below, the transfer of the first plunger (207) is restricted.

Description

Magnetic switch and engine starter

technical field

The present invention relates to an engine starter (starter) for starting a vehicle engine and a magnetic switch thereof.

Background technique

As background art in this technical field, there is Japanese Patent Application Laid-Open No. 2010-248999 (Patent Document 1). This gazette describes a starter (engine starting device) in which the pinion pushing solenoid for pushing the pinion toward the ring gear side and the motor energizing switch for opening and closing the motor contacts each have a To form the solenoid coil and the switch coil of the electromagnet, a fixed iron core shared by both is arranged between the solenoid coil and the switch coil, and a solenoid for covering the pinion is continuously formed in the axial direction. The outer circumference of the solenoid yoke and the switch yoke covering the outer circumference of the switch for energizing the motor are integrally provided in the form of an integral yoke (refer to abstract).

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2010-248999

Contents of the invention

The problem to be solved by the invention

In the starter of Patent Document 1, the pinion is pushed out from the initial position (retreat position) by using the solenoid for pushing out the pinion to mesh with the ring gear connected to the engine, and then the contact of the motor is closed by the switch for energizing the motor. Instead, the starter motor (electric motor) is energized to rotate the pinion gear. Control of pushing out of the pinion and driving of the starter motor is performed by an engine control unit (ECU) that controls the engine and a controller (starter controller) provided to the engine starter.

In ordinary engine starters including the starter of Patent Document 1, the ECU can prevent the starter motor from being driven in advance for a failure or malfunction that can be detected by the ECU. However, if the pinion gear is not pushed out to the meshing position with the ring gear due to an obstacle or malfunction that cannot be detected by the ECU, there is a possibility that the drive of the starter motor will start in a state where the pinion gear is not meshed with the ring gear. In addition, the motor contact that energizes the starter motor is opened and closed by a switch for energizing the motor, and the switch for energizing the motor is usually driven by a relay. If the relay malfunctions and the switch for energizing the motor is driven, the starter motor is energized to start driving the starter motor without the pinion gear being pushed out to the meshing position with the ring gear.

An object of the present invention is to provide a magnetic switch and an engine starter capable of preventing a starter motor from being driven in a state where a pinion gear is not pushed out to a meshing position with a ring gear.

technical means to solve problems

In order to achieve the above object, the magnetic switch of the present invention has: a fixed contact, which is fixed on the housing; a movable contact, which is arranged to be able to abut against the fixed contact; a first plunger, which moves the movable contact toward the The fixed contact is moved; and the second plunger is used to move the pinion provided on the engine starter, and when the amount of movement of the second plunger is equal to or less than a predetermined value, the movement of the first plunger restricted.

In order to achieve the above object, the engine control device of the present invention includes: a starter motor; a pinion driven to rotate by the starter motor; A mechanism for opening and closing contacts provided on the energizing circuit of the starter motor.

The effect of the invention

According to the invention, the first plunger cannot be moved to the position where it closes the contacts provided on the energized circuit to the starter motor without the second plunger moving the pinion into mesh with the ring gear, thus , it is possible to prevent the starter motor from being driven in a state where the pinion gear is not pushed out to the meshing position with the ring gear.

Problems, configurations, and effects other than those described above will be clarified through the description of the following embodiments.

Description of drawings

FIG. 1 is a perspective view showing the appearance of an engine starting device 1 according to a first embodiment of the present invention.

FIG. 2 is a side view of the engine starter 1 viewed from the direction indicated by arrow II in FIG. 1 .

FIG. 3 is an external view of the engine starter 1 of the present embodiment viewed from the rear side.

FIG. 4 is a circuit diagram showing main parts of the electrical configuration of the engine starting device 1 of the present embodiment.

FIG. 5 is a schematic diagram showing a wiring structure provided outside the engine starting device 1 of the present embodiment.

FIG. 6 is a diagram showing the structure of the through bolt 9 of the engine starting device 1 of the present embodiment.

FIG. 7 is an external view showing the external appearance of the magnetic switch 7 viewed from the side.

FIG. 8 is an external view showing the appearance of the magnetic switch 7 as viewed from the rear side (terminal portion side).

FIG. 9 is a cross-sectional view showing a cross-section of the magnetic switch 7 shown in FIG. 6 as viewed from the arrow IX-IX.

FIG. 10 is a cross-sectional view showing a cross-section of the magnetic switch 7 shown in FIG. 6 as viewed from the arrow IX-IX.

FIG. 11 is an enlarged cross-sectional view showing the vicinity of the first solenoid coil 30AC and the second solenoid coil 30BC.

Detailed ways

Next, examples of the present invention will be described.

Example 1

First, the overall configuration of an engine starting device (starter) 1 according to the present invention will be described using FIGS. 1 and 2 . FIG. 1 is a perspective view showing the appearance of an engine starting device 1 according to this embodiment. FIG. 2 is a side view of the engine starter 1 viewed from the direction indicated by arrow II in FIG. 1 . FIG. 3 is an external view of the engine starter 1 of the present embodiment viewed from the rear side. In addition, in the following description, the front side and the back side are defined and used as shown in FIG. 2. FIG. That is, in the direction along the center line CL, the gear cover 2 side is defined as the front side, and the starter control device 3 side is defined as the rear side.

The engine starting device 1 includes a gear cover (gear case) 2 on the front side, a starter control device 3 on the rear side, and a starter motor 4 at an intermediate portion between the gear cover 2 and the starter control device 3 . The outer periphery of the starter motor 4 is covered by a case 4A, and the rear end of the case 4A is covered by a rear cover 6 . The case 4A and the rear cover 6 constitute a case of the starter motor 4 (starter motor case). Furthermore, the case 4A is a member constituting a yoke of the starter motor 4 . The case 4A and the rear cover 6 are included in the starter motor 4 . In the following description, the starter motor including the case 4A and the rear cover 6 may be referred to as a starter motor 4 as a whole.

The gear cover 2 houses the displacement mechanism 12 (see FIG. 4 ), the one-way clutch 10 (see FIG. 4 ), the pinion gear 13 (see FIG. 4 ), and the like, and has a cylindrical portion 2A on the rear side. The attachment portion 5 for fixing the engine starter 1 to the engine side protrudes outward in the radial direction from the outer peripheral surface of the cylindrical portion 2A and is provided on the gear cover 2 in a flange shape. The engine starter 1 is fastened to the engine side by inserting bolts (not shown) into the bolt insertion holes 5A formed in the mounting portion 5 .

Furthermore, on the outer peripheral surface of the cylindrical portion 2A of the gear cover 2, a magnetic switch (electromagnetic switch) 7 (refer to FIG. 4 ) which is a driving part of the fixed displacement mechanism 12 is provided so as to protrude radially outward from the outer peripheral surface. Magnetic switch mounting part 8. The cylindrical portion 2A of the gear cover 2 constitutes a fixing portion of the starter motor 4 , and the starter motor 4 is attached to a rear end portion of the cylindrical portion 2A. The starter motor 4 is mounted on the rear end of the cylindrical portion 2A in a cantilever shape. In addition, the magnetic switch 7 is mounted on the magnetic switch installation portion 8 in a cantilever shape. An output shaft 4B (see FIG. 5 ) of a speed reducer (not shown) is arranged in parallel to the drive shaft of the magnetic switch 7 .

The starter control device 3 is a device that controls energization to a solenoid 30 (see FIG. 4 ) provided in the starter motor 4 and the magnetic switch 7 . The case 3A housing the starter control device 3 is attached to the end (end face) of the rear cover 6 opposite to the starter motor 4 side. A connector 104 for electrically connecting to an engine control device (engine control unit: ECU) is provided on an outer peripheral portion of a casing 3A of the starter control device 3 .

Here, the configuration of the through bolt 9 will be described using FIG. 6 . FIG. 6 is a diagram showing the structure of the through bolt 9 of the engine starting device 1 of the present embodiment.

In this embodiment, three through-bolt fastening portions 3B are provided at intervals in the circumferential direction on the outer peripheral portion of the housing 3A (see FIG. 3 ). A through hole 3B1 penetrating from the rear side to the front side is formed in the through bolt connection portion 3B. A ring-shaped member 3B2 made of metal (made of copper in this embodiment) is provided in the middle portion of the through hole 3B1. A through hole 3B3 penetrating through the annular member 3B2 in the axial direction is formed in the annular member 3B2.

The casing 3A constitutes a resin case (starter control device case) of the starter control device 3 and constitutes a circuit module of the engine starter device 1 . The above-mentioned metallic annular member 3B2 is molded on the resin forming the case 3A. In addition, the housing 3A is composed of a circuit board accommodating portion 3AA for accommodating a circuit board and a flange portion (flange portion) 3AB formed with a through bolt connection portion 3B. The circuit board accommodating portion 3AA and the flange portion (flange portion) 3AB are It is constructed by stacking in the direction of the center line CL. In addition, case 3A is included in starter control device 3 , and in the following description, the entire starter control device including case 3A may be referred to as starter control device 3 and described.

The center line CL is a line segment that passes through the axis of the rotation shaft of the starter motor 4 , and is a line segment that passes through the axis of the output shaft of the starter motor 4 via a reduction gear (not shown).

Three through-bolt penetration portions (flange portions) 6A are provided on the outer peripheral portion of the rear cover 6 at intervals in the circumferential direction. A through hole 6A1 penetrating in the axial direction is formed in the through bolt penetration portion 6A. The rear cover 6 is made of metal (aluminum in this embodiment), and constitutes a ground for the starter motor 4 . The starter control unit 3 is assembled from the rear side of the rear cover 6 .

Three screw hole forming portions 2B are provided on the cylindrical portion 2A of the gear cover 2 at intervals in the circumferential direction, and the screw hole forming portions 2B are formed to protrude from the outer peripheral surface of the cylindrical portion 2A. A screw hole 2B1 is formed in the screw hole forming portion 2B along the axial direction.

Insert the through bolt 9 into the through hole 3B3 of the annular member 3B2 provided on the through bolt connecting portion 3B and the through hole 6A1 of the through bolt penetration portion 6A from the rear side toward the front side (gear cover 2 side), and screw them together. to the screw hole 2B1 formed in the screw hole forming portion 2B of the gear cover 2 . Thereby, the starter control device 3 (housing 3A) is connected and fixed to the gear cover 2 .

At this time, the annular member 3B2 of the starter control device 3 abuts against the end surface 6A2 of the through-bolt penetration portion 6A, and is pressed against the end surface 6A2 by the tightening force of the through-bolt 9 . One of the three annular members 3B2 is electrically connected to the ground terminal 103 of the starter control device 3 via a bus bar 3B2B. Therefore, by fastening the starter control device 3 to the gear cover 2 with the through bolts 9 , the ground terminal 103 of the starter control device 3 is electrically connected to the rear cover 6 , that is, the ground of the starter motor 4 .

The through bolts 9 inserted into the through holes 3B1 of the through bolt connection portion 3B of the casing 3A are provided so as to be inserted through the through bolt penetration portions 6A of the rear cover 6 . The fastening force acting between the case 3A and the gear cover 2 through the bolts 9 acts to compress the case 4A of the starter motor 4 in the direction of the rotation shaft 4B of the starter motor 4 . This fastening force causes the rear cover 6 and the starter motor 4 to be interposed and fixed between the casing 3A and the gear cover 2 . In the present embodiment, the through bolts 9 are arranged outside the case (yoke) 4A of the starter motor 4 and are exposed to the outside.

In this embodiment, the distance L1 between the two penetration bolts 9 arranged on the side of the magnetic switch 7 is greater than that between each of the two penetration bolts 9 and the penetration bolt 9 arranged farthest from the magnetic switch 7 . The resulting distances L2 and L3 are short. In this embodiment, the three through-bolts 9 are arranged at the vertices of an isosceles triangle especially when the distance L2 and the distance L3 are equal and projected on a plane perpendicular to the rotation axis 4B of the starter motor 4 .

In this embodiment, by arranging the three through bolts 9 at the vertices of the isosceles triangle, the supporting force (fixing force) of the starter motor 4 is increased on the side of the magnetic switch 7 . This reduces the influence of vibration on the wiring portions (bus bars) 20B, 20M, and 20S provided between the magnetic switch 7 and the starter control device 3 . In addition, by providing wiring parts (including internal wiring of the starter control device 3 ) 20B, 20M, and 20S between the two through bolts 9 arranged at both ends of the side L1, the fixing part of the starter control device 3 is avoided. Interference with the wiring parts 20B, 20M, and 20S facilitates wiring work.

It is also possible to arrange the three through bolts 9 at the vertices of the equilateral triangle so that the distance L1, the distance L2, and the distance L3 are equal. In this case, the support force in the circumferential direction becomes uniform compared to the case where the three through bolts 9 are arranged at the vertices of the isosceles triangle. However, the fact that interference between the fixing structure of the starter control device 3 and the wiring parts 20B, 20M, and 20S can be avoided remains unchanged.

A battery connection terminal 15B, a motor connection terminal 15M, and a solenoid connection terminal 15S are provided on the rear end surface 7AB of the cover (magnetic switch housing) 7A of the magnetic switch 7, and the battery connection terminal 15B is connected to the battery 50 (refer to 4) and the bus bar 20B from the starter control device 3, the motor connection terminal 15M is connected to the bus bar 20M for energizing the starter motor 4 from the starter control device 3, the The solenoid connection terminal 15S is connected to the bus bar 20S for energizing the solenoid 30B (see FIG. 4 ) of the magnetic switch 7 from the starter control device 3 . The battery connection terminal 15B, the motor connection terminal 15M, and the solenoid connection terminal 15S are connection terminals to which wiring members are electrically connected.

In addition, the case 7A is contained in the magnetic switch 7, and in the following description, the whole magnetic switch including the case 7A may be referred to as the magnetic switch 7 and demonstrated.

The bus bar 20B from the starter control device 3 is electrically connected to the battery connection terminal 15B, and the battery connection terminal 15B serves as a relay terminal for supplying a battery voltage to the starter control device 3 . In addition, a harness 21 drawn from the starter motor 4 is connected to the motor connection terminal 15M, and the starter motor 4 is energized from the starter control device 3 through the relay to the motor connection terminal 15M. That is, the motor connection terminal 15M is a relay terminal for energizing the starter motor 4 from the starter motor 4 .

The bus bar 20B, bus bar 20M, and bus bar 20S extend from the starter control device 3 in a direction along the rotation shaft 4B of the starter motor 4, and are connected to the battery connection terminal 15B, the motor connection terminal 15M, and the solenoid connection terminal 15S.

The ends of the bus bar 20B, bus bar 20M, and bus bar 20S that are connected to the battery connection terminal 15B, the motor connection terminal 15M, and the solenoid connection terminal 15S are provided with bifurcated branch portions that surround the respective terminals 15B, 15M, The respective terminals 15B, 15M, and 15S are fastened by nuts 28B, 28M, and 28S in the form of a part of the circumference of the terminal 15S. As a result, the electrical connection becomes good, and a vibration-resistant connection structure is realized.

Next, the electrical configuration and operation of the engine starter will be described using FIGS. 4 and 5 . FIG. 4 is a circuit diagram showing main parts of the electrical configuration of the engine starting device 1 of the present embodiment. FIG. 5 is a schematic diagram showing a wiring structure of an external station of the engine starting device 1 of the present embodiment.

The positive side of the battery power source 50 is electrically connected to an engine control device (engine control unit: ECU) 70 via an ignition switch 60 . The ECU is electrically connected to a controller (ASIC) 110 of the starter control device 3 via a connector 104 . In addition, the output side of the ignition switch 60 is also electrically connected to the controller 110 , and the controller 110 is electrically connected to the positive side of the battery power source 50 via the ignition switch 60 .

The magnetic switch 7 is composed of a solenoid 30 including a first solenoid 30A and a second solenoid 30B. One end of the first solenoid 30A is electrically connected to a terminal 17 provided on the magnetic switch 7 , and the terminal 17 is electrically connected to the output side of the relay 80 via the harness 24 . The input side of the relay 80 is electrically connected to the positive side of the battery power source 50 . On the other hand, the other end portion of the first solenoid 30A is electrically connected to the terminal 19 . Terminal 19 is grounded to body ground 31 .

The body ground is the gear cover 2, and the gear cover 2 is at ground potential.

One end of the second solenoid 30B is connected to the solenoid connection terminal 15S, and the solenoid connection terminal 15S is electrically connected to the terminal 105 of the starter control device 3 via the bus bar 20S. The terminal 105 is electrically connected to a switching element 150 composed of a MOSFET. On the other hand, the other end portion of the second solenoid 30B is electrically connected to the terminal 19 .

The first solenoid 30A is electrically connected to the positive side of the battery power source 50 via the relay 80 , and by turning on the relay 80 , the first solenoid 30A is energized from the battery power source 50 . The relay 80 is controlled to be turned on and off by the ECU 70 through the signal line 25 .

The second solenoid 30B is electrically connected to the source S of the MOSFET 150 constituting the switching element, and the drain D of the MOSFET 150 is connected to the battery connection terminal 15B via the terminal 101 of the starter control device 3 and the bus bar 20B, and then via the harness 22 It is electrically connected to the positive side of the battery power source 50 . The gate G of the MOSFET 150 is electrically connected to the controller (ASIC) 110 through a signal line 150S, and the MOSFET 150 is turned on and off by receiving a control signal from the controller 110 . When the MOSFET 150 is turned on, the second solenoid 30B is energized from the battery power source 50 .

In this embodiment, the movement of the first plunger 207 (refer to FIG. 7 ), which will be described later, is restricted by the MOSFET 150 as an electric switch. That is, the MOSFET 150 controls the transfer of the first plunger 207 . In this case, the transfer control of the first plunger 207 is performed by the MOSFET 150 which controls the energization of the second solenoid 30B which transfers the second plunger 201 (refer to FIG. 7 ), which will be described later.

The starter motor 4 is constituted by a DC motor, and an electrode on the positive side of the starter motor 4 is electrically connected to the motor connection terminal 15M via a harness 21 . Motor connection terminal 15M is electrically connected to terminal 102 of starter control device 3 via bus bar 20M. The terminal 102 is electrically connected to the source S of the MOSFET 120 constituting the switching element, and the drain D of the MOSFET 120 is connected to the battery connection terminal 15B via the terminal 101 of the starter control device 3 and the bus bar 20B, and then connected to the battery power supply 50 via the wire harness 22 The positive side is electrically connected. On the other hand, the electrode on the negative side of the starter motor 4 is connected to the terminal 18 . Terminal 18 is electrically connected to main body ground 31 via through bolt 9 or case (yoke) 4A of starter motor 4 .

A fixed contact 214 of the magnetic switch 7 described later is electrically connected to the motor connection terminal 15M, and the other fixed contact 212 is connected to the positive terminal of the battery power source 50 via the battery connection terminal 15B.

Since the main body 31 is provided on the gear cover 2 , the bolt 9 or the cover (yoke) 4A of the starter motor 4 is interposed between the terminal 18 and the terminal 19 connected to the negative electrode of the starter motor 4 .

In this embodiment, as the energization circuit to the starter motor 4 , an energization circuit for energization through the fixed contact 212 and the fixed contact 214 and an energization circuit for energization through the MOSFET 120 are provided. In the case of starting the engine after stopping for a long time, a large drive current is required to drive the starter motor 4 . On the other hand, in the case of restarting after a relatively short stop time, the drive current of the starter motor 4 may be a small current. For example, for idling stop and the like, the starter motor 4 can be energized using the energization circuit of the MOSFET 120 to start the engine.

The gate G of the MOSFET 120 is electrically connected to the controller 110 through the signal line 120S, and the MOSFET 120 is turned on and off by receiving a control signal from the controller 110 . When the MOSFET 120 is turned on, the starter motor 4 is energized from the battery power source 50 . Furthermore, a control signal is output from the controller 110 to the gate G of the MOSFET 120 so as to energize the starter motor 4 at a duty rate based on a command from the ECU 70 .

Furthermore, the drain D of the MOSFET 150 and the drain D of the MOSFET 120 are grounded via the capacitor 170 . Capacitor 170 is provided to absorb surges when MOSFET 150 and MOSFET 120 are switched.

The source S of the MOSFET 150 is connected to the second solenoid 30B through the terminal 105 , and on the other hand, is connected to the terminal 103 of the starter control device 3 through the diode 160 . In addition, the source S of the MOSFET 120 is connected to the starter motor 4 through the terminal 102 , and on the other hand, is connected to the terminal 103 of the starter control device 3 through the diode 130 . Terminal 103 is connected to terminal 18 provided on the negative electrode side of starter motor 4 via wiring component 23 .

Specifically, the terminal 18 is electrically connected to the rear cover 6, and both the terminal 18 and the rear cover 6 are at ground (earth) potential. In addition, the terminal 103 is a ground (earth) terminal of the starter control device 3 and is electrically connected to the rear cover 6 . The ground terminal 103 of the starter control device 3 is electrically connected to the terminal 18 on the negative electrode side of the starter motor 4 via the rear cover 6 constituting a part of the wiring member 23 .

In this embodiment, it is preferable to electrically connect the ground terminal 103 of the starter control device 3 to the rear cover 6 by fastening the through bolt 9 . In this case, the ground terminal 103 can be electrically connected to the rear cover 6 via the through bolt 9 . Alternatively, conductive members may be respectively provided at the abutting portions of the through-bolt connection portion (flange portion) 3B and the through-bolt penetration portion (flange portion) 6A, and the conductive member on the side of the through-bolt connection portion 3B may be electrically connected to the terminal 103 The conductive member on the side of the through-bolt penetration portion (flange portion) 6A is electrically connected to the terminal 18 , and the two conductive members are brought into contact by tightening the through-bolt 9 to be electrically connected. In this case, the terminal 103 may also be configured by a conductive member penetrating through the side of the bolt connection portion 3B.

The rear cover 6 is electrically connected to the body ground 31 of the gear cover 2 via the through bolts 9 or the yoke 4A of the starter motor 4 . Therefore, ideally, the rear cover 6 is at the same potential as the gear cover 2 and has a ground potential. In fact, due to the presence of resistance through the bolts 9 or the yoke 4A of the starter motor 4 , strictly speaking, a potential difference occurs between the rear cover 6 and the gear cover 2 .

The diode 130 is a freewheeling diode that returns the surge current Is generated when the power supply to the starter motor 4 is cut off to the starter motor 4, and is formed by electrically connecting the terminal 103 and the terminal 18 with the wiring part 23 to form a connected freewheeling diode. 130, a closed circuit of terminal 102, bus bar 20M, motor connection terminal 15M, starter motor 4, terminal 18 (ground), terminal 103 (ground). That is, in this embodiment, a closed circuit that flows the circulating current Is to the starter motor 4 is formed in the energization circuit that energizes the starter motor 4 . By using the circulating current Is circulating in this closed circuit to drive the starter motor 4, power saving can be achieved. In addition, Id represents the driving current of the starter motor 4 supplied through the MOSFET 120 .

The above electrical connections are made as schematically shown in FIG. 5 . As described above, in FIG. 5 , the ground terminal 103 of the starter control device 3 and the terminal 18 on the negative electrode side of the starter motor 4 are electrically connected via the rear cover 6 .

When the ignition switch 60 is turned on, the ECU 70 activates the controller 110 at the time when the initialization is completed, and starts the operation of the starter control device 3 . Also, the ECU 70 outputs a signal to turn on the relay 80 through the signal line 25 at the time point when the initialization is completed. In addition, in the starter control device 3 after starting, an ON signal is output from the controller 110 to the gate G of the MOSFET 150 through the signal line 150S.

When the relay 80 and the MOSFET 150 are turned on to energize the first solenoid 30A and the second solenoid 30B, the displacement mechanism 12 is driven to push out the one-way clutch 10 and the pinion in the direction indicated by the arrow A. 13. The pinion gear 13 pushed out from the retracted position by the shift mechanism 12 meshes with the ring gear 500A connected to the engine 500 . That is, the displacement mechanism 12 is a mechanism for displacing the pinion gear 13 between the retreat position and the meshing position with the ring gear 500A connected to the engine.

When the pinion gear 13 meshes with the ring gear 500A, an ON signal is output from the controller 110 to the MOSFET 120 through the signal line 120S. In this case, the conduction signal is output so as to become the conductivity (Duty) instructed by the ECU. As a result, the starter motor 4 is driven to rotate the pinion gear 13 . Further, the ring gear 500A meshing with the pinion gear 13 rotates, thereby causing the engine 500 to start.

Next, the configuration of the bus bar will be described using FIG. 2 . In this embodiment, a bent portion 20-3 is provided on the bus bar 20B. Like the bus bar 20B, the bus bars 20M, 20S are also provided with bent portions 20-3, but in FIG. 2, the bent portions 20-3 of the bus bars 20M, 20S are hidden from view.

The bent portions 20 - 3 provided on the bus bars 20B, 20M, and 20S improve the assemblability of the engine starter device 1 . That is, in the engine starting device 1 of this embodiment, it is difficult to make the dimensional accuracy high in the direction along the rotation shaft 4B of the starter motor 4 . Therefore, the position of the bus bar 20B, the bus bar 20M, and the bus bar 20S provided on the side of the starter control device 3 and the battery connection terminal 15B, the motor connection terminal 15M, and the solenoid connection terminal provided on the rear end surface 7B of the magnetic switch case 7B The position of 15S may deviate in the direction along the rotation axis 4B of the starter motor 4 . The bent portion 20 - 3 absorbs deviation in the direction along the rotation axis 4B, thereby improving the assemblability in wiring work in particular. In addition, when the positions of the bus bar 20B, the bus bar 20M, and the bus bar 20S are deviated from the positions of the battery connection terminal 15B, the motor connection terminal 15M, and the solenoid connection terminal 15S due to thermal expansion, it is also possible to pass the bent portion 20-3. to absorb the deviation. Furthermore, the stress on the bus bar portion due to vibration can be reduced by the bending portion 20-3.

Specifically, the bus bars 20B, 20M, and 20S of this embodiment include a first part 20-1 and a second part 20-2, and the first part 20-1 runs from the starter control device 3 toward the The second portion 20 - 2 extends from the center side of the starter motor 4 toward the outside in a direction perpendicular to the direction along the rotation axis 4B of the starter motor 4 (radius direction of the starter motor 4 ). , and between the first part 20-1 and the second part 20-2, a relatively loose bending part 20-3 is provided in the direction along the rotation axis 4B of the starter motor 4. That is, the bent portion 20-3 connects the first part 20-1 and the second part 20-2.

Next, the configuration of the magnetic switch 7 will be described in detail using FIG. 7 . FIG. 7 is a cross-sectional view of the magnetic switch 7 when the first solenoid 30A and the second solenoid 30B are in a non-energized state (cross-section viewed along the line VII-VII in FIG. 3 ). In addition, in the following description, the direction shown by the arrow 17 in FIG. 7 will be described as the axis direction. The axial direction l7 is a direction parallel to the centerline CL and included in the same plane as the centerline CL. Furthermore, the axial direction l7 coincides with the axial center (central axis) of the plunger shaft 207B, the transfer regulating shaft member 207C, and the shaft member 201A.

First, the configuration of the magnetic switch 7 will be described using FIG. 7 . In addition, FIG. 7 has shown the state at the time of making the 1st solenoid 30A and the 2nd solenoid 30B into a non-energized state.

A first solenoid 30A and a second solenoid 30B are provided in the magnetic switch 7 . The first solenoid 30A constitutes an actuator for opening and closing switches 211 , 212 , and 214 that supply battery power to the starter motor 4 . Furthermore, the second solenoid 30B constitutes an actuator that drives the shift mechanism 12 of the transfer pinion 13 . In the magnetic switch 7 of the present embodiment, the connection terminal portion 200A, the main contact portion 200B, the electromagnetic drive portion of the first solenoid 30A, and the electromagnetic drive portion of the second solenoid 30B are from the rear side toward the front in the axial direction l7 Sides are configured sequentially. That is, in the magnetic switch 7 of this embodiment, the central axis of the first plunger 207 of the first solenoid 30A and the central axis of the second plunger 201 of the second solenoid 30B are arranged in series on the same axis. . That is, the first plunger 207 and the second plunger 201 are arranged in the axial direction.

First, the second solenoid 30B will be described. The second solenoid 30B includes a pinion transfer plunger (second plunger) 201 , a pinion transfer fixed core (second fixed core) 202 , and a pinion transfer screw wound around a bobbin 203 . The bobbin coil (second solenoid coil) 30BC, the yoke 204, and the plunger return spring 205 for pinion transfer.

The pinion transfer plunger 201 constitutes a movable iron core in the second solenoid 30B, and is a cylindrical member formed with stepped through-holes 201H1, 201H2, 201H3 penetrating through the center in the central axis 17 direction. Regarding the inner diameters of the through holes 201H1, 201H2, and 201H3, the inner diameter of the through hole portion 201H1 is the largest, the inner diameter of the through hole portion 210H2 is smaller than that of the through hole portion 201H1, and the inner diameter of the through hole portion 201H3 is the smallest. The through-hole portion 201H1 is provided on the end portion side of the plunger 201 protruding outward from the yoke 204 of the magnetic switch 7 . The through-hole portion 201H3 is provided on the end portion side located inside the yoke 204 . The through hole portion 201H2 is provided between the through hole portion 201H1 and the through hole portion 201H2.

One end of the shaft member 201A is inserted into the through hole 210H1 , and the other end of the shaft member 201A protrudes outward from the end surface 201F of the plunger 201 . An enlarged diameter portion (flange portion) 201A1 is formed at one end portion of the shaft member 201A. A groove-shaped engaging portion 201A2 that engages with the shift mechanism 12 is provided at the other end portion of the shaft member 201A. The shaft member 201A is inserted through the coil spring 201B, and one end of the coil spring 201B comes into contact with the enlarged diameter portion 201A1. The other end portion of the coil spring 201B is in contact with the ring-shaped stop ring 201C fixed to the end portion of the through-hole portion 201H1 . The coil spring 201B is sandwiched between the enlarged diameter portion 201A1 and the stop ring 201C, and biases the shaft member 201A so as to press the end surface 201A3 of the enlarged diameter portion 201A1 to the stepped portion 201H4 between the through hole portion 201H1 and the through hole portion 201H2 .

The through-hole portion 201H2 and the stepped portion 201H5 of the through-hole portion 201H3 constitute an engaging portion with which a transfer regulating shaft member 207C of a contact transfer plunger 207 described later engages. Further, the through-hole portion 201H2 constitutes a space in which the transfer regulating shaft member 207C passing through the through-hole portion 201H3 can be displaced relative to the plunger 201 in the direction of the central axis 17 .

The fixed iron core 202 for pinion transfer is a member which attracts the plunger 201 toward the end surface (attraction surface) 202S by magnetic attraction force. The fixed iron core 202 is constituted by an annular member having a through-hole 202A penetrating in the direction of the central axis 17 formed at the center. The transfer regulating shaft member 207C is inserted through the through hole 202A.

A plunger return spring 205 for pinion transfer is provided between the fixed iron core 202 for pinion transfer and the plunger 201, and the plunger 201 will be moved toward the fixed iron core 202 by magnetic force in the direction of the central axis l7. The force in the direction in which the plunger 201 is pushed back. Return spring 205 has one end in contact with step portion 202C formed on the outer periphery of end surface 202S of fixed core 202 , and the other end abuts against step portion 201D formed in the outer periphery of the rear end of plunger 201 .

The solenoid coil 30BC for pinion transfer is arranged so as to straddle the outer peripheral side of the plunger 201 for pinion transfer and the outer peripheral side of the movement space 206 of the plunger 201 for pinion transfer. The solenoid coil 30BC is wound around the bobbin 203 . In the central portion of the bobbin 203 , a movement space 206 is formed by the inner peripheral surface of a through hole 203A penetrating in the direction of the central axis 17 .

The outer peripheral portion of the fixed iron core 202 and the outer peripheral portion of the solenoid coil 30BC are covered by the yoke member 204 . The yoke member 204 is formed of a bottomed cylindrical member having a bottom 204A, and a through hole 204B through which the plunger 201 penetrates in the axial direction is formed at the center of the bottom 204A. The opposite side of the bottom portion 204A of the yoke member 204 covers the outer peripheral portion of the first solenoid 30A, reaching to the outer peripheral portion of the contact case 217 . The yoke member 204 also serves as a yoke member of the first solenoid 30A and constitutes a case (casing) 7A of the magnetic switch 7 .

Next, the first solenoid 30A will be described. The first solenoid 30A includes a plunger for contact transfer (first plunger) 207, a fixed core A for contact transfer (first fixed core A) 208, and a fixed core B for contact transfer (first fixed core A). B) 209 , solenoid coil for contact transfer (first solenoid coil) 30AC wound on bobbin 213 , yoke 204 , plunger return spring 221 for contact transfer, and movable contact 211 .

The plunger 207 for contact transfer is composed of a movable iron core 207A, a plunger shaft 207B, and a transfer regulating shaft member 207C. A movable iron core 207A configured as a member different from the plunger shaft 207B is attached to one end portion (the end portion on the plunger 201 side) of the plunger shaft 207B. For this purpose, a through hole 207AA penetrating in the direction of the central axis 17 is formed in the central portion of the movable iron core 207A. In addition, a small-diameter portion 207BB forming a stepped portion 207BA is formed at one end portion of the plunger shaft 207B. The small-diameter portion 207BB of the plunger shaft 207B is inserted into the through hole 207AA of the movable iron core 207A, and the movable iron core 207A is attached to the plunger shaft 207B.

At one end of the plunger shaft 207B, an annular groove 207BC is formed on the end side of the portion where the movable iron core 207A is mounted. The locking claw 207CA on the side (rear side) is locked in the annular groove 207BC, and the transfer regulating shaft member 207C is connected to the plunger shaft 207B. The outer diameter of the transfer regulating shaft member 207C, especially on the plunger shaft 207B side, is larger than the inner diameter of the through hole 207AA of the movable iron core 207A. Therefore, it is possible to prevent the movable iron core 207A from coming off from the plunger shaft 207B by connecting the transfer regulating shaft member 207C to the plunger shaft 207B.

An enlarged diameter portion (flange portion) 207CB is formed at the end portion of the transfer restricting shaft member 207C on the plunger 201 side, and the enlarged diameter portion 207CB is caught on the stepped portion 201H5 of the plunger 201, so that the transfer restricting shaft member 207C is fixed to the plunger. The relative displacement of 201 is restricted. If the relative displacement of the transfer restricting shaft member 207C with respect to the plunger 201 is restricted, the contact transfer plunger 207 including the plunger shaft 207B connected to the transfer restricting shaft member 207C will no longer be able to move relative to the plunger 201 . In this case, the relative displacement between the transfer regulating shaft member 207C or the plunger 207 for contact transfer and the plunger 201 is the direction in which the enlarged diameter portion 207CB of the transfer regulating shaft member 207C abuts against the stepped portion 201H5 of the plunger 201 . Displacement, with respect to this relative displacement, can perform a relative displacement in the opposite direction.

In this embodiment, when the transfer amount of the plunger 201 is equal to or less than a predetermined value, the transfer amount of the first plunger 207 for contact transfer is limited to a ratio of the movable contact point 211 to the fixed contact point by the transfer limiting shaft member 207C. 212,214 abut against the small size of the transfer amount. In particular, in this embodiment, the transfer regulating shaft member 207C functions as a restricting member that restricts the transfer of the contact transfer plunger 207 when the transfer amount of the plunger 201 is equal to or less than a predetermined value.

As described above, the transfer regulating shaft member 207C is a connection member that connects the plunger shaft 207B or the plunger 207 for contact transfer and the plunger 201 .

Small-diameter portions 207BE are formed from the end of the plunger shaft 207B on the opposite side to the plunger 201 side to the center of the plunger shaft 207B on the left and right, and a stepped portion 207BD is formed at a connecting portion between the small-diameter portion 207BE and the large-diameter portion 207BF. . An annular movable contact 211 is provided on the small diameter portion 207BE. With respect to the movable contact 211 , a retaining ring 220 is fitted into an annular groove 207BG formed in the small diameter portion 207BE on the distal end side of the small diameter portion 207BE to prevent the movable contact 211 from falling off the plunger shaft 207B.

A spring member 223 for urging the movable contact 211 toward the stop ring 220 is provided between the movable contact 211 and the stepped portion 207BD. In this embodiment, the spring member 223 is composed of a coil spring. The movable contact 211 is a member (conductive member) that is electrically connected to the fixed contact 212 and the fixed contact 214. An annular insulating member 222A is provided between the retaining ring 220 and the movable contact 211. Between the spring member 223 and the movable contact An annular insulating member 222B is provided between 211 .

A plunger return spring 221 for contact transfer is provided between the end face of the stop ring 220 on the opposite side to the movable contact 211 and the contact housing 217 . The return spring 221 is a spring member that urges the plunger 207 toward the plunger 201 in the direction of the central axis 17 . That is, the return spring 221 biases the movable core 207A of the plunger 207 away from the first fixed core A 208 .

The fixed iron core A 208 for contact transfer is provided with an end surface (magnetic attraction surface) 208A opposite to the end surface 207AB of the movable iron core 207A and a through hole 208B penetrating the center along the central axis 17. The plunger shaft 207B is inserted through the through hole 208B.

The fixed iron core B209 for contact transfer is arrange|positioned so that the solenoid coil 30AC may be sandwiched in the direction of the central axis 17 together with the fixed iron core A208 for contact transfer. A cylindrical portion 209A is formed on the fixed iron core B 209 , and the cylindrical portion 209A extends from the inner peripheral end thereof in the direction of the central axis 17 toward the end surface 208A of the fixed iron core A 208 . The inner peripheral surface of the cylindrical portion 209A faces the outer peripheral surface of the movable iron core 207A. The inner peripheral surface of the cylindrical portion 209A is in contact with the outer peripheral surface of the movable iron core 207A, and functions as a guide surface that guides the movement of the plunger shaft 207B in the direction of the central axis 17 via the movable iron core 207A.

The fixed core A208 and the fixed core B209 are members constituting the fixed core in the first solenoid 30A. The fixed core A208 constitutes a part of the fixed core in the first solenoid 30A, and the fixed core B209 constitutes a part of the fixed core in the first solenoid 30A.

The yoke 204 is provided so as to straddle the outer peripheral portion of the fixed iron core A 208 and the outer peripheral portion of the fixed iron core B 209 . In addition, between the fixed iron core B209 and the fixed iron core 202 for pinion transfer, a non-magnetic member 210 having an extremely lower magnetic permeability than the fixed iron core A208, the fixed iron core B209, and the fixed iron core 202 is provided so that the fixed iron core The magnetic circuit formed on the core B 209 is magnetically separated from the magnetic circuit formed on the fixed iron core 202 . As the nonmagnetic member 210, aluminum, resin, rubber, or the like can be used.

As will be described later, when the first solenoid 30A is not energized, the plunger 207 is biased by the return spring 221 , and the end surface 207AC of the movable iron core 207A comes into contact with the non-magnetic member 210 to stop. By configuring the non-magnetic member 210 with a member such as resin or rubber, it is possible to reduce the impact sound generated when the movable iron core 207A comes into contact. When the non-magnetic member 210 is composed of a member such as aluminum that is likely to produce a collision sound when the movable iron core 207A comes into contact, it is preferable to interpose an elastic member such as rubber, resin, or a disc spring between the non-magnetic member 210 and the non-magnetic member 210. Between the movable iron core 207A.

A through hole 210A penetrating through the center portion in the direction of the center axis 17 is formed in the non-magnetic member 210 . The transfer regulating shaft member 207C is inserted through the through hole 210A.

Next, the main contact portion 200B will be described. On the contact case 217, the fixed contact 212 and the fixed contact 214 are arranged and fixed at positions symmetrical across the plunger rod 207B (center axis 17). When the movable contact 211 moves along the central axis l7, it abuts against both the fixed contact 212 and the fixed contact 214, thereby electrically connecting the fixed contact 212 and the fixed contact 214. When the fixed contact 212 is electrically connected to the fixed contact 214 , the starter motor 4 is energized from the battery power source 50 .

Here, a method of assembling the plunger 201 and the plunger 207 will be described. The transfer regulating shaft member 207C is inserted from the through hole portion 201H1 side of the plunger 201, then the shaft member 201A is inserted into the through hole portion 201H1, the coil spring 201B is inserted into the through hole portion 201H1, and the stop ring 201C is attached.

The spring member 223 is assembled from one end of the plunger shaft 207B, and thereafter, the insulating member 222B, the movable contact 211 , and the insulating member 222A are assembled to the plunger shaft 207 in this order. Finally, the retaining ring 220 is assembled to prevent the spring member 223 , the insulating member 222B, the movable contact 211 and the insulating member 222A from falling off. The movable iron core 207A is assembled from the other end side of the plunger shaft 207B, and then the assembly of the plunger 207 is inserted into the inside of the yoke 204, and the movement restricting shaft member inserted in the through hole 202A of the fixed iron core 202 is inserted. 207C is coupled to plunger shaft 207B. Furthermore, when the transfer regulating shaft member 207C is inserted into the through hole 202A of the fixed iron core 202, the return spring 205 is previously attached to the inner side of the bobbin 203 around which the solenoid coil 30BC is wound.

Next, the operation of the engine starter will be described using FIGS. 7 to 10 . 8 is a cross-sectional view of the magnetic switch 7 when the first solenoid 30A is in the non-energized state and the second solenoid 30B is in the energized state (cross-section viewed along the line VII-VII in FIG. 3 ). 9 is a cross-sectional view of the magnetic switch 7 when the first solenoid 30A is in the energized state and the second solenoid 30B is in the non-energized state (cross-section viewed along the line VII-VII in FIG. 3 ). FIG. 10 is a cross-sectional view of the magnetic switch 7 when the first solenoid 30A and the second solenoid 30B are in an energized state (cross-section viewed along the line VII-VII in FIG. 3 ).

FIG. 7 shows a state in which the first solenoid 30A and the second solenoid 30B are not energized (non-energized state). Hereinafter, the state of FIG. 7 will be referred to as an initial state for description.

In this state, the plunger 207 is biased by the return spring 221 , and the movable iron core 207A of the plunger 207 comes into contact with the non-magnetic member 210 to come to rest. Furthermore, the movable contact 211 is pressed against the stop ring 220 by the spring member 223 via the insulating member 222B. At this time, the gap L4 between the movable contact 211 and the fixed contact 212 and the fixed contact 214 is the length La. That is, the length of the gap L4 in the initial state is La.

In addition, the gap L5 between the end surface 207AB of the movable iron core 207A and the end surface 208A of the first fixed iron core A208 is the length Lb. That is, the length of the gap L5 in the initial state is Lb.

The plunger 201 is biased by the return spring 205, and the gap L6 between the end surface 201E of the plunger 201 and the end surface 202S of the fixed iron core 202 is a length Lc. That is, the length of the gap L6 in the initial state is Lc.

The shaft member 201A is biased by the coil spring 201B so that the enlarged diameter portion 201A1 of the shaft member 201A comes into contact with the stepped portion 201H4 of the plunger 201 . In addition, the plunger 201 is urged by the return spring 205 to come to rest at a position where the enlarged diameter portion 207CB of the transfer regulating shaft member 207C engages with the step portion 201H5 . In this state, the gap L7 between the end surface 201A3 of the shaft member 201A and the end surface 207CC of the enlarged diameter portion 207CB of the transfer regulating shaft member 207C is the length Ld. That is, the length of the gap L7 in the initial state is Ld.

Furthermore, since the enlarged diameter portion 207CB of the transfer regulating shaft member 207C restricts the rightward movement of the plunger 201 in the figure, the plunger 201 does not come off the magnetic switch 7 .

The length dimensions La, Lb, Lc, and Ld are in the relationship of La<Lb<Ld<Lc.

FIG. 8 shows the case where the first solenoid 30A is in a non-energized state and the second solenoid 30B is in an energized state. By energizing the second solenoid coil 30BC of the second solenoid 30B, a magnetic flux φB is generated on the magnetic circuit circulating among the plunger 201 , the yoke 204 , and the second fixed iron core 202 . By generating magnetic flux φB, a magnetic attraction force acts between the second fixed iron core 202 and the plunger 201 , so that the plunger 201 is attracted by the second fixed iron core 202 . FIG. 8 shows a state where the end surface 201E of the plunger 201 is in contact with the end surface 202S of the second fixed iron core 202 .

In this state, the plunger 201 has moved by the length Lc in the initial state of the gap L6. At this time, since the gap L6 (=Lc) and the gap L7 (=Ld) in the initial state are in the relationship of L7<L6, the end surface 201A3 of the shaft member 201A comes into contact with the end surface 207CB of the transfer regulating shaft member 207C, and the The transfer regulating shaft member 207C is pressed by a distance (Lc−Ld) toward the first fixed iron core 208A side. As a result, the gap L5 between the end surface 207AB of the movable iron core 207A and the end surface 208A of the first fixed iron core 208 becomes Lb-(Lc-Ld). In addition, the gap L4 between the movable contact 211 and the fixed contact 212 and the fixed contact 214 becomes La-(Lc-Ld). In this case, there is a relationship of Lb>(Lc-Ld), and a relationship of La>(Lc-Ld). In addition, since La<Lb, in the state of FIG. 8, the relationship of L4<L5 exists.

In this embodiment, when the first solenoid 30A is in a non-energized state and the second solenoid 30B is energized, the gap L4 between the movable contact 211, the fixed contact 212 and the fixed contact 214 is greater than zero, and the movable contact 211 does not contact the fixed contact 212 and the fixed contact 214 . Therefore, if only the second solenoid 30B is energized, the starter motor 4 is not energized through the fixed contact 212 and the fixed contact 214 .

FIG. 9 shows the case where the first solenoid 30A is in the energized state and the second solenoid 30B is in the non-energized state. By energizing the first solenoid coil 30AC of the first solenoid 30A, a magnetic flux is generated on the magnetic circuit circulating among the first fixed iron core A208, the movable iron core 207A, the first fixed iron core B209, and the yoke 204. φA. By generating magnetic flux φA, a magnetic attraction force acts between the first fixed iron core A208 and the movable iron core 207A.

In this embodiment, when the second solenoid 30B is not energized, the movement resistance when the plunger 201 is moved toward the fixed iron core 202 is larger than the magnetic attraction force of the fixed iron core 208 attracting the movable iron core 207A. . Specifically, the urging force of the return spring 205 is set to be larger than the magnetic attraction force of the fixed iron core 208 attracting the movable iron core 207A.

Therefore, in this state, neither the plunger 207 nor the plunger 201 operates, and the initial state (the state of FIG. 7 ) is maintained. Accordingly, if only the first solenoid 30A is energized, the starter motor 4 is not energized through the fixed contact 212 and the fixed contact 214 .

FIG. 10 shows the situation that the first solenoid 30A and the second solenoid 30B are in the energized state. By energizing the first solenoid coil 30AC of the first solenoid 30A and the second solenoid coil 30BC of the second solenoid 30B, coils are generated in the first solenoid 30A and the second solenoid 30B, respectively. Magnetic flux φA (refer to FIG. 9 ) and magnetic flux φB (refer to FIG. 8 ). By generating magnetic flux φA, a magnetic attraction force acts between the first fixed iron core 208 and the movable iron core 207A, and the movable iron core 207A is attracted by the first fixed iron core 208 . Furthermore, by generating magnetic flux φB, a magnetic attraction force acts between the second fixed iron core 202 and the plunger 201 , and the plunger 201 is attracted by the second fixed iron core 202 .

As a result, the plunger 201 moves until its end face 201E abuts against the end face 202S of the second fixed iron core 202 . That is, the plunger 201 is in the state shown in FIG. 8 . In this case, the gap L6 between the end surface 201E of the plunger 201 and the end surface 202S of the fixed iron core 202 is zero.

On the other hand, the movable iron core 207A moves until its end surface 207AB abuts against the end surface 208A of the first fixed iron core A208 . This state is the same as the state in which the movable iron core 207A starts to move from the state shown in FIG. 8 until it abuts against the end surface 208A of the first fixed iron core A208 . In this case, the gap L5 between the end surface 207AB of the movable iron core 207A and the end surface 208A of the first fixed iron core A208 is zero.

In the state of FIG. 10, the movable contact 211 abuts against the fixed contact 212 and the fixed contact 214, and is relatively displaced relative to the plunger rod 207B until the gap L8 between the insulating member 222A and the stop ring 220 becomes Lb-La. Location. At this time, the movable contact 211 is pushed to the fixed contact 212 and the fixed contact 214 by the spring member 223 , and maintains a state of being in contact with the fixed contact 212 and the fixed contact 214 . That is, the gap L4 between the movable contact 211 and the fixed contact 212 and the fixed contact 214 is zero.

The size of L5=Lb is larger than the size of L4=La. Accordingly, movable contact 211 can be reliably brought into contact with fixed contact 212 and fixed contact 214 within the range of stroke L5=Lb of movable iron core 207A, thereby eliminating the need for high dimensional accuracy and assembly accuracy. In addition, since the magnetic attraction force is received by the movable iron core 207A when the end surface 207AB of the movable iron core 207A abuts against the end surface 208S of the fixed iron core 208 , the force received by the movable contact 211 is not large. The movable contact 211 is pushed back by a distance of Lb−La along the direction away from the retaining ring 220 , and is pushed to the fixed contact 212 and the fixed contact 214 by the force of the spring member 223 . That is, the urging force of the spring member 223 may be set to a magnitude necessary for electrical connection between the movable contact 211 and the fixed contact 212 and the fixed contact 214 .

The size of L6=Lc is larger than the size of L5=Lb. Thereby, the movable iron core 207A can be moved to the position where the end surface 201E of the plunger 201 is in contact with the end surface 202S of the fixed iron core 202 to abut against the fixed iron core 208 .

By setting the dimension of L7=Ld to be equal to or greater than the value obtained by subtracting the dimension of L5=Lb from the dimension of L6=Lc, the plunger 201 and the plunger 207 move to contact with the fixed iron core 202 and the fixed iron core 208, respectively. In the state of the position, the transfer regulating shaft member 207C and the shaft member 201A are no longer in contact. Considering the state where the second solenoid 30B is driven when the first solenoid 30A is not driven, the dimension L7=Ld is preferably equal to or greater than the value obtained by subtracting the dimension L4=La from the dimension L6=Lc. Accordingly, it is possible to prevent the movable contact 211 from coming into contact with the fixed contact 212 and the fixed contact 214 simply by the operation of the second solenoid 30B. In addition, by making the dimension of L7=Ld smaller than the dimension of L6=Lc, unnecessary enlargement of the magnetic switch 7 in the axial direction l7 can be avoided.

The starting of the engine will be described. As described above, the energization circuit that connects the battery power source 50 to the starter motor 4 to start the engine includes a energization circuit that energizes through the fixed contacts 212 and 214 and a energization circuit that energizes through the MOSFET 120 .

First, an energization circuit for connecting the battery power source 50 to the starter motor 4 via the fixed contact 212 and the fixed contact 214 will be described. When the ignition switch 60 is turned on, the ECU 70 activates the controller 110 at the time when the initialization is completed, and starts the operation of the starter control device 3 . In addition, ECU 70 outputs a signal for turning on relay 80 via signal line 25 when initialization is completed. In addition, in the starter control device 3 after starting, an ON signal is output from the controller 110 to the gate G of the MOSFET 150 through the signal line 150S.

By turning on the relay 80, the solenoid coil 30AC of the first solenoid 30A is energized, and a magnetic flux φA is generated on the magnetic circuit composed of the fixed iron core 208, the movable iron core 207A, the fixed iron core 209, and the yoke 204. . On the other hand, by turning on MOSFET 150 , the solenoid coil 30BC of the second solenoid 30B is energized, and a magnetic flux φB is generated on the magnetic circuit constituted by the fixed core 202 , the plunger 201 , and the yoke 204 .

The plunger 201 moves to a position where the end surface 201E of the plunger 201 abuts the end surface 202S of the fixed iron core 202 by generating the magnetic flux φB. At this time, one end of the displacement mechanism 12 that engages with the engaging portion 201A2 formed at the end of the shaft member 201A is pulled, and the other end of the displacement mechanism 12 pushes the pinion 13 out to the contact with the ring gear 500A. Engagement position. On the other hand, the plunger 207 moves to a position where the end surface 207AB of the movable iron core 207A contacts the end surface 208A of the fixed iron core 208 by generating the magnetic flux φA. As a result, the movable contact 211 comes into contact with the fixed contact 212 and the fixed contact 214 , and electric power is supplied from the battery power source 50 through the fixed contact 212 and the fixed contact 214 . Also, the starting of the starter motor 4 is performed after the pinion gear 13 meshes with the ring gear 500A.

When the pinion gear 13 meshes with the ring gear 500A, an ON signal is output from the controller 110 to the MOSFET 120 through the signal line 120S. In this case, the conduction signal is output so as to become the conductivity (Duty) instructed by the ECU. As a result, the starter motor 4 is driven, causing the pinion 13 to rotate. Further, the ring gear 500A meshing with the pinion gear 13 rotates, thereby causing the engine 500 to start.

Here, it is assumed that some kind of failure or failure occurs while the plunger 201 is in the initial state shown in FIG. As a result, the second solenoid 30B cannot operate. Alternatively, it is assumed that the relay 80 is turned ON due to a malfunction in a state where the second solenoid 30B is not energized.

In the above case, the second solenoid 30B does not operate, and the plunger 201 continues to maintain a static state. Therefore, even if the relay 80 is turned on to energize the first solenoid 30A, it is locked by the plunger 201. The movement of the plunger 207 is also hindered by the movement restricting shaft member 207C. Therefore, plunger 207 cannot move in a direction (to the right in FIG. 10 ) in which movable contact 211 comes into contact with fixed contact 212 and fixed contact 214 to close contacts 212 and 214 .

In order to realize this action, in this embodiment, when the second solenoid 30B is not energized, the movement resistance when the plunger 201 moves toward the fixed iron core 202 side is lower than the magnetic force of the fixed iron core 208 attracting the movable iron core 207A. Attractive. Specifically, the urging force of the return spring 205 is set to be larger than the magnetic attraction force of the fixed iron core 208 attracting the movable iron core 207A.

Thus, even if the first solenoid 30A is energized when the second solenoid 30B is not energized, the movement of the plunger 207 will be restricted by the plunger 201, and the plunger 207 cannot move toward the closing contacts 212 and 214 ( Figure 10 is the right) movement. Therefore, the starter motor 4 is not energized through the contacts 212 and 214 . Accordingly, it is possible to prevent the starter motor 4 from being driven in a state where the pinion gear 13 is not pushed out to the meshing position with the ring gear 500A.

In this embodiment, the first solenoid 30A and the second solenoid 30B are arranged adjacent to each other in the axial direction l7. Furthermore, the fixed iron core 209 of the first solenoid 30A and the fixed iron core 202 of the second solenoid 30B are arranged at an extremely close distance. In this embodiment, the magnetic circuit of the first solenoid 30A and the magnetic circuit of the second solenoid 30B are connected by disposing the non-magnetic body 210 between the fixed iron core 209 and the fixed iron core 202 which are arranged at a very close distance. The road separates. The fixed iron core 209 and the fixed iron core 202 can also be comprised with one member.

Next, bobbin 103 and bobbin 213 will be described using FIG. 11 . FIG. 11 is an enlarged cross-sectional view (XI-XI cross-sectional view shown in FIG. 3 ) showing the vicinity of the first solenoid coil 30AC and the second solenoid coil 30BC.

The first solenoid coil 30AC is wound around the bobbin 203 and housed inside the case 7A of the magnetic switch 7 . The second solenoid coil 30BC is wound around the bobbin 213 and housed inside the case 7A of the magnetic switch 7 . The bobbin 203 and the bobbin 213 are arranged in series along the direction of the central axis l7.

A through-hole 202B penetrating in the direction of the central axis 17 is formed in the fixed iron core 202 at substantially the same position as the inner circumference of the solenoid coil 30BC in the radial direction. In addition, a through hole 209C penetrating in the direction of the central axis 17 is formed on the outer peripheral side of the cylindrical portion 209A of the fixed iron core B209. Further, a through hole 210B penetrating in the direction of the central axis 17 is formed on the outer peripheral side of the through hole 210A of the non-magnetic member 210 . In the fixed core A208 for contact transfer, a through-hole 208C penetrating in the direction of the central axis 17 is provided on the outer peripheral side of the through-hole 208B.

The lead wire of the first solenoid coil 30AC is drawn out to the space 230 where the movable contact 211 is arranged through the through hole 208C. Lead wires of the second solenoid coil 30BC pass through the through hole 202B, the through hole 209C, the through hole 210B, and the through hole 208C, and are drawn out to the space 230 where the movable contact 211 is disposed. To this end, the bobbin 213 is provided with a first solenoid coil lead-out portion 213B from which the first solenoid coil 30AC is drawn and a second solenoid coil lead-out portion 213A from which the second solenoid coil 30BC is drawn. The first solenoid coil lead-out portion 213B and the second solenoid coil lead-out portion 213A are inserted into the through hole 208C of the fixed iron core A208 . In addition, the second solenoid coil lead-out portion 213A is inserted into the through hole 208C of the fixed iron core B209.

The first solenoid coil lead-out part 213B and the second solenoid coil lead-out part 213A are respectively provided one on both sides of the plunger 207 with the plunger 207 in between. Terminals 231A and 231B are provided on bobbin 213 . The terminals 231A, 231B are provided between the first solenoid coil lead-out portion 213B and the second solenoid coil lead-out portion 213A. A terminal 231A is provided on one side of the plunger 207 across the plunger 207 , and a terminal 231B is provided on the other side. One lead-out line of the first solenoid coil 30AC drawn out from the nearby first solenoid coil lead-out portion 213B is connected to the terminal 231A. Another lead-out line of the first solenoid coil 30AC is electrically connected to the fixed iron core 208 . One lead-out line of the second solenoid coil 30BC drawn out from the nearby second solenoid coil lead-out portion 213A is connected to the terminal 231B. Another lead-out line of the second solenoid coil 30BC is electrically connected to the fixed iron core 208 .

Terminal 231A protrudes into space 230 , and its tip end is electrically connected to terminal 17 . The terminal 231B protrudes into the space 230 , and its tip portion is electrically connected to the solenoid connection terminal 15S.

In this embodiment, by inserting the first solenoid coil lead-out portion 213B and the second solenoid coil lead-out portion 213A into the through hole 208C, and inserting the second solenoid coil lead-out portion 213A into the through hole 208C, The first solenoid coil 30AC and its lead wires, the second solenoid coil 30BC and its lead wires, the fixed core 202 , the non-magnetic member 210 , the fixed core B209 and the fixed core A208 can be easily assembled. That is, by the first solenoid coil lead-out portion 213B and the second solenoid coil lead-out portion 213A protruding from the winding portion of the first solenoid coil 30AC in the direction of the central axis 17, the iron core 202 can be fixed, The circumferential positioning of the magnetic member 210 , the fixed iron core B209 and the fixed iron core A208 improves the working efficiency of assembly.

In addition, this invention includes various modification examples, and is not limited to the said Example. For example, the above-described embodiments are detailed descriptions for explaining the present invention in an easy-to-understand manner, and are not necessarily limited to having all the configurations. In addition, addition, deletion, and replacement of other configurations may be performed on a part of configurations of the embodiments.

Symbol Description

1...Engine starter, 2...Gear cover, 2A...Cylindrical part, 2B...Screw hole forming part, 3...Starter control device, 3A...Shell of starter control device, 3B...Through bolt connection part (flange part ), 3B'...Bolt fastening part, 4...Starter motor, 4A...Case (yoke), 4B...Rotation shaft of starter motor 4, 5...Installation part, 5A...Bolt insertion hole, 6...Back cover, 6A ...Through the bolt penetration part (flange part), 6A'...Bolt fastening part, 7...Auto switch, 7A...The cover of the auto switch 7, 7AB...The rear end surface of the cover 7A, 8...Auto switch mounting part, 9...through bolt, 10...one-way clutch, 11...rotation sensor, 11A...rotation sensor connector, 12...shift mechanism, 13...pinion, 15B...battery connection terminal, 15M...motor connection terminal, 15S...screw Conduit connection terminal, 17...terminal, 18...terminal, 19...terminal, 20B, 20M, 20S...busbar (wiring part), 20C...bending part of busbar, 22...wire harness, 23...wiring parts, 24... Wire harness, 25...signal wire, 28B, 28M, 28S...nut, 29...bolt, 30...solenoid, 30A...first solenoid, 30AC...solenoid coil for contact transfer (first solenoid coil ), 30B...second solenoid, 30BC...pinion transfer solenoid coil (second solenoid coil), 31...body ground, 50...battery power supply, 60...ignition switch, 70...engine control device ( Engine control unit: ECU), 80...relay, 101...terminal, 102...terminal, 103...terminal, 104...connector, 105...terminal, 110...controller (ASIC), 120...switching element (MOSFET), 150... Switching element (MOSFET), 120S...signal line, 130...diode, 150S...signal line, 170...capacitor, 160...diode, 200A...connecting terminal, 200B...main contact part, 201...pinion transfer plunger (No. 2 plunger), 201A...shaft member, 201A1...enlarged diameter portion (flange portion) of shaft member 201A, 201A2...engagement portion with shift mechanism 12, 201A3...end surface, 201B...coil spring, 201C...retaining ring , 201D...stepped part, 201E...end face, 201H1, 201H2, 201H3...through hole, 201H4, 201H5...stepped part, 202...fixed core for pinion transfer (second fixed core), 202A, 202B...through hole , 202C...step part, 202S...end surface (attraction surface) of fixed iron core 202 for pinion transfer, 203...coil bobbin, 203A...through hole, 204...yoke, 204A...bottom of yoke member 204, 205...small Plunger return spring for gear transfer, 206...moving space of plunger 201 for pinion transfer, 207...plunger for contact transfer, 207A...movable iron core, 207AA...through hole, 20 7AB...end face, 207B...plunger shaft, 207BA...stepped part, 207BB...small diameter part, 207BC...annular groove, 207BD...stepped part, 207BE...small diameter part, 207BF...large diameter part, 207BG...annular groove, 207C... Feed limiting shaft member, 207CA...lock claw, 207CB...expanded part (flange part), 208...fixed core A for contact transfer (first fixed core A), 208A...end face, 208B, 208C...through hole , 209...fixed iron core B for contact transfer (first fixed iron core B), 209A...cylindrical part, 209B...inner peripheral surface, 209C...through hole, 210...non-magnetic member, 210A, 210B...through hole, 211 ...movable contact, 212...fixed contact, 213...coil bobbin, 213A...second solenoid coil lead-out part, 213B...first solenoid coil lead-out part, 214...fixed contact, 217...contact shell, 220...block Coil, 221...Plunger return spring for contact transfer, 222A, 222B...Insulation member, 223...Spring member, 500...Motor, 500A...Ring gear.

Claims (10)

1. An electromagnetic switch, which has: a fixed contact, which is fixed on the housing; a movable contact, which is configured to abut against the fixed contact; a first plunger, which moves the movable contact toward the The above-mentioned fixed contact is transferred; and the second plunger is used to transfer the pinion gear provided on the engine starting device, and the electromagnetic switch is characterized in that, It further includes: a first solenoid that applies a magnetic attraction force to the first plunger to move the first plunger; and a second solenoid that applies a magnetic attraction force to the second plunger. and moving the second plunger; and a coupling member that makes the first plunger and the second plunger interlock, axially configuring the first plunger and the second plunger, The resistance that the second plunger receives when moving toward the first plunger is set to be greater than the magnetic attraction force that the first plunger receives from the first solenoid, When the transfer amount of the second plunger is equal to or less than a predetermined value, the transfer of the first plunger is restricted. 2. The electromagnetic switch according to claim 1, characterized in that, The limitation of the movement of the first plunger is performed by an electric switch. 3. The electromagnetic switch according to claim 2, characterized in that, The electrical switch is a switch that controls energization of the second solenoid that moves the second plunger. 4. An engine starting device, characterized in that it has: a starter motor; a pinion driven to rotate by the starter motor; and a displacement mechanism that transfers the pinion, and has a The electromagnetic switch described in any one of the above is used as a mechanism for opening and closing a contact, and the contact is provided on an energizing circuit to the starter motor. 5. An engine starting device, characterized in that it has: a starter motor; a pinion driven by the starter motor; a displacement mechanism that moves the pinion; and a magnetic switch that has a first screw. a solenoid and a second solenoid that drives the shifting mechanism, the first solenoid opens and closes a contact provided on the energized circuit to the starter motor, The first solenoid has a first fixed iron core, a first plunger, and a first solenoid coil, and is configured to: by energizing the first solenoid coil, the magnetic attraction force acts on the direction and the The first plunger being biased on the side opposite to the first fixed core side attracts the first plunger to the first fixed core side, The second solenoid has a second fixed iron core, a second plunger, and a second solenoid coil, and is configured to: by energizing the second solenoid coil, the magnetic attraction force acts on the direction and the the second plunger, which is biased on the side opposite to the second fixed iron core side, attracts the second plunger to the second fixed iron core side, The first solenoid and the second solenoid are configured to be arranged along a driving direction of the first plunger and the second plunger, and the first fixed iron core exerts an influence on the first plunger. The magnetic attraction force of the first plunger is in the same direction as the magnetic attraction force generated by the second fixed iron core to the second plunger, A connecting member is provided, and the connecting member is connected with the second plunger to limit the displacement of the first plunger toward the first fixed iron core side, The movement resistance of the second plunger toward the second fixed iron core is greater than the magnetic attraction force of the first fixed iron core acting on the first plunger. 6. The engine starting device according to claim 5, comprising a first fixed contact electrically connected to the power source side and a second fixed contact electrically connected to the starter motor side, The first solenoid includes a movable iron core at one end of the first plunger, and a movable contact facing the first fixed contact and the second fixed contact at the other end. 7. The engine starting device according to claim 6, wherein: In a state where the first solenoid and the second solenoid are not energized, with respect to the contact formed between the movable contact and the first fixed contact and the second fixed contact As for the gap L4, the gap L5 formed between the first fixed iron core and the movable iron core is relatively large. 8. The engine starting device according to claim 7, wherein: The second plunger has: a first hole opening on an end face opposite to the end face of the second fixed iron core and provided along the axis; a second hole having a diameter smaller than the first hole; and a third hole formed to have a diameter smaller than that of the first hole, open on the bottom surface of the second hole, and pass through to the end surface on the side of the second fixed iron core. , and the second plunger is provided with a shaft member, one end of the shaft member is inserted into the first hole, and the other end is provided with an engaging portion that engages with the displacement mechanism, The connection member is configured such that one end is connected to the end of the first plunger, and the other end is formed with a diameter-enlarged portion, and the diameter-enlarged portion is inserted into the second hole, and the The enlarged diameter portion is locked to the stepped portion between the second hole and the third hole. 9. The engine starting device according to claim 8, wherein: The other end portion of the coupling member restricts movement in the axial direction by abutting against an end surface of the one end portion of the shaft member, When the shaft member abuts against the stepped portion between the first hole and the second hole, the enlarged diameter portion is locked by the stepped portion between the second hole and the third hole. In the state, the length L7 of the gap formed between the other end portion of the coupling member and the end surface of the shaft member is smaller than that formed in the second solenoid when the second solenoid is energized. The length L6 of the gap between the end surface of the plunger on the side of the second fixed iron core and the side of the second fixed iron core is small. 10. The engine starting device according to claim 9, wherein: A length obtained by subtracting the length L4 of the gap from the length L6 of the gap is smaller than the length L7 of the gap.