JP2014163370A - Engine starting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine starting device equipped with easily-assembled simple mag switch, which does not require a solenoid coil protection member newly mounted.SOLUTION: An engine starting device includes an electric motor, an output shaft rotated by rotation of the electric motor, a pinion moving body fitted onto a helical spline formed on the output shaft and axially movable, a solenoid coil generating magnetic force when energized, an electromagnetic solenoid for moving the pinion moving body toward a ring gear by means of attractive force of the solenoid coil, a contact switch coil generating magnetic force when energized, and a contact switch opening and closing energization contacts of the electric motor by means of attractive force of the contact switch coil. The electromagnetic solenoid and the contact switch are formed integrally in series in the axial direction, and an inner diameter of the contact switch coil is larger than an inner diameter of the solenoid coil.

Description

  The present invention relates to an engine starting device.

  In order to save environmental resources and save energy resources, idling can be automatically stopped by shutting off the fuel supplied to the engine when a predetermined condition is established that allows the engine to be temporarily stopped while the vehicle is operating. Is already being implemented in some automobiles.

  In an automobile corresponding to this idle stop, it is necessary to operate the engine start device every time the engine is restarted after the idle stop, and the number of operations of the engine start device has been dramatically increased. There is a need for improvement in performance. There is an increasing need to improve the pinion and ring gear biting durability, which is one of the main factors of the durability of the engine starter.

  As one technique that satisfies this requirement, as disclosed in Patent Document 1, an electromagnetic solenoid for transferring the pinion to the ring gear and a contact switch for opening and closing the contact of the motor are provided, and the pinion is connected to the ring gear. There is a technique for opening and closing a contact of an electric motor after operating a transfer means.

Japanese Patent No. 4640530

  In the prior art described in Patent Document 1, an electromagnetic switch that opens and closes a main contact and a solenoid that pushes a pinion gear toward the ring gear side of the engine are integrally configured in series in the axial direction, and the outer diameter of the electromagnetic switch coil is an excitation coil of the solenoid. It is smaller than the outer diameter, and the lead wire of the exciting coil is arranged on the outer periphery of the switch coil. In general, in such a configuration, since it is necessary to protect from an electrical short circuit between the switch case and the exciting coil, in the prior art, the lead wire holding member is axially disposed from the winding frame of the resin exciting coil. Projecting and extending to hold and protect the lead wire.

  When the resin excitation coil winding frame including the lead wire holding member is adopted, the lead wire holding member is added to the original winding frame, which may be a negative effect of the coil winding work or projectingly extending. The lead wire holding portion may be damaged during the production process or the reel transport process.

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an engine starter having a simple magnet switch that is easy to assemble and does not require a new solenoid coil protection member.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. To give an example of this, the motor, an output shaft that rotates by the rotation of the motor, and a helical spline formed on the output shaft, An axially movable pinion moving body, a solenoid coil that generates magnetic force when energized, an electromagnetic solenoid that transfers the pinion moving body to the ring gear by the attraction force of the solenoid coil, and a contact switch that generates magnetic force when energized A coil, and a contact switch that opens and closes the current-carrying contact of the electric motor by the attractive force of the contact switch coil, and the electromagnetic solenoid and the contact switch are integrally formed in an axial series, and the inner diameter of the contact switch coil Is configured to be larger than the inner diameter of the solenoid coil.

  According to the present invention, it is not necessary to newly provide a solenoid coil protection member, and an engine starter including a simple mag switch that is easy to assemble can be provided.

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

1 is an overall view of an engine starter according to the present invention. Sectional drawing of a mug switch. Sectional drawing of the mag switch which shows the lead wire of a solenoid coil. The figure of the winding frame of a solenoid coil. The figure of a 3rd fixed iron core. The perspective view which wound the solenoid coil around the solenoid coil winding frame. The figure which wound the solenoid collyl around the solenoid coil winding frame. The figure of a contact switch body. The perspective view of a 1st fixed iron core. The perspective view of a contact coil winding frame. The figure of a 2nd fixed iron core. The figure of a contact coil winding frame. Sectional drawing which inserted the electromagnetic solenoid and the contact switch in the coil case, and pulled out the lead wire of the contact switch coil. Sectional drawing which inserted the electromagnetic solenoid and the contact switch in the coil case, and pulled out the lead wire of the solenoid coil. A diagram of the contact case. The circuit diagram of a present Example.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall view showing an example of an engine starting device according to the present invention. The engine starter 1 is engaged with an electric motor 2 that generates a rotational force, an output shaft 3 that outputs the rotational force of the electric motor 2, and a helical spline formed on the output shaft 3. The pinion moving body 4 having a one-way clutch (not shown), a contact switch 5 for opening and closing the energizing contact to the electric motor 2, and the pinion moving body 4 via the link bar 6 are connected to the engine. An electromagnetic solenoid 8 for transferring to the ring gear 7 and a coil case 9 for housing the contact switch 5 and the electromagnetic solenoid 8 are included. The contact switch 5 and the electromagnetic solenoid 8 are arranged in series in the axial direction in the coil case 9 and are integrally held by the coil case 9. The contact switch 5 is electrically connected to the battery 11 a via the wiring 11 and electrically connected to the electric motor 2 via the reed sensor 13.

  In the following description, the contact switch 5 integrated with the coil case 9 and the electromagnetic solenoid 8 are collectively referred to as a mag switch 10. Further, with respect to the axial direction of the mag switch 10, the contact switch 5 side is referred to as an axial direction I, and the electromagnetic solenoid 8 side is referred to as an axial direction II.

  The electric motor 2, the output shaft 3, the pinion moving body 4, the link bar 6, the ring gear 7 and the like, which are other components other than the mag switch 10, are configured to perform opening / closing of the energizing contact of the electric motor and transfer of the pinion moving body to the ring gear. Since it is the same structure and operation | movement as the thing of the conventional engine starting apparatus performed with one solenoid, detailed description is abbreviate | omitted.

  FIG. 2 is a cross-sectional view of the mag switch 10 of this embodiment. The contact switch 5 includes a contact case body 15 including a fixed contact 12 electrically connected to the battery 11a via the wiring 11, a fixed contact 14 electrically connected to the electric motor 2 via the lead sensor 13, and the axial direction. The first movable iron core 17 movable in the axial direction, the first movable iron core 17 movable in the axial direction, the first fixed iron core 18 and the second fixed iron core 19 forming a part of the magnetic circuit of the contact switch 5, and the magnetic force generated by energization. The contact switch coil 20 for generating the contact switch, the resin-made first winding frame 21 around which the contact switch coil 20 is wound, the coil case 9 forming a part of the magnetic circuit, and the like.

  In addition, the bush 22, bush 23, movable contact shaft 24, bush 25, contact push spring 26, fixed contact 12 and fixed contact 14 for supporting, moving in the axial direction and electrically insulating the movable contact 16 are made of resin. Since the tome 27, the tome 28 for fixing to the case 15a, the contact return spring 29 when the contact is opened, and the like are the same in configuration and function as those of conventional known mag switches, the description thereof is omitted.

  The electromagnetic solenoid 8 includes a solenoid coil 30 that generates a magnetic force when energized, a resin-made second winding frame 31 around which the solenoid coil 30 is wound, and a third fixed iron core 32 that forms a part of a magnetic circuit in a disk shape. And the second movable iron core 33 attracted to the third fixed iron core 32 side by the magnetic force generated by energizing the solenoid coil 30, and the coil case 9 forming a part of the magnetic circuit.

  The coil case 9 has a function of a magnetic circuit of the contact switch 5 and the electromagnetic solenoid 8, and a mag switch 10 is integrally formed by tightening the axial direction I side opening as an example. The direction II side is a bottomed cylindrical shape having an opening 36 for accommodating the second movable iron core 33, and the bottom is thicker than the cylindrical part to form a part of the magnetic circuit. It is formed by pressing or the like.

  Hereinafter, an example of an integral configuration method of the mag switch 10 will be described.

  First, the electromagnetic solenoid 8 will be described with reference to FIGS. 3, 4, 5, and 6.

  As shown in FIG. 3, a second winding frame 31 around which the solenoid coil 30 is wound is installed on the bottom of the coil case 9 via an elastic body 35 that absorbs axial backlash. A convex protrusion 37 is provided on the end surface on the axial direction II side of the second winding frame 31, and is fitted into a through hole 38 provided at a position facing the protrusion 37 at the bottom of the coil case 9. On the other hand, the second winding frame 31 is stopped around the rotation direction.

  As shown in FIG. 4, a U-shaped convex portion 41 and a U-shaped convex portion 42 are installed on the end surface on the axial direction I side of the second winding frame 31, and the winding start opening 39 of the solenoid coil 30 and the solenoid coil 30. Are passed through a U-shaped convex portion 41 and a U-shaped convex portion 42, respectively, and are drawn out in the axial direction II side. The U-shaped convex portion 40 and the U-shaped convex portion 42 may each have a hollow cylindrical shape.

  As shown in FIG. 5, the third fixed iron core 32 has an axial thickness H2 in which the axial thickness is smaller than the height H1 (see FIG. 4) of the U-shaped convex portion 41 and the U-shaped convex portion 42. It is said. Further, two U-shaped grooves 43 are provided at positions of the third fixed iron core 32 facing the U-shaped convex portion 41 and the U-shaped convex portion 42.

  As shown in FIGS. 6 and 7, the U-shaped convex portion 41 and the U-shaped convex portion 42 installed on the second winding frame 31 are fitted into the U-shaped groove 43 of the third fixed iron core 32. By this fitting, the rotation of the third fixed iron core 32 in the rotational direction with respect to the coil case 9 is stopped. Further, the winding start lead 39 and the winding end lead 40 are not in direct contact with the third fixed iron core 32 and can be electrically insulated. The through hole 58 installed in the third fixed iron core 32 will be described later.

  In the present embodiment, as shown in FIG. 8, the contact switch coil 20, the first winding frame 21, the first fixed iron core 18, the second fixed iron core 19, and the first movable iron core 17 that are part of the components of the contact switch 5. These four components are assembled as a sub-assembly, and this sub-assembly is referred to as a contact switch coil body 57.

  Hereinafter, the contact switch coil body 57 will be described with reference to FIGS. 2, 8, 9, 10, 11, and 12.

  As shown in FIG. 8, a cylindrical convex portion 34 that is partially opened in the axial direction is provided on the axial direction I side of the first winding frame 21, and the winding start lead 44 of the contact switch coil 20 is pulled out in the axial direction. A cylindrical projection 45 having a part opened is provided, and the contact switch coil 20 is wound around the first winding frame 21 so that the winding end lead 46 of the contact switch coil 20 is pulled out. The first movable iron core 17 is inserted from the side opening. In addition, by providing the level | step difference 19a in the inner peripheral part of the 1st winding frame 21, and positioning the axial direction II side of the 1st movable iron core 17, the axis | shaft of the 1st movable iron core 17 is not added, without newly adding components. Directional positioning can be performed.

  As shown in FIGS. 8 and 9, the first fixed iron core 18 has an axial thickness H <b> 4 smaller than the height H <b> 3 of the cylindrical convex portion 34 and the cylindrical convex portion 45. In addition, two U-shaped grooves 47 are provided in the first fixed iron core 18 at positions facing the cylindrical convex portion 34 and the cylindrical convex portion 45. The U-shaped groove 47 of the first fixed iron core 18 is installed by fitting with the cylindrical convex portion 34 and the cylindrical convex portion 45 installed on the first winding frame 18. By this fitting, the first fixed iron core 18 is prevented from rotating in the rotation direction with respect to the first reel 21, and the lead 44 and the lead 46 are not in direct contact with the first fixed iron core 18, Can be electrically isolated.

  As shown in FIGS. 8 and 10, two cylindrical projections 47 having a height H5 and two cylindrical projections 48 having a height H6 are installed on the side of the first winding frame 21 in the axial direction II. Further, as shown in FIG. 11, a position facing the cylindrical protrusion 47 on the second fixed iron core 19 in which the axial thickness H7 is set smaller than the height H5 of the cylindrical protrusion 47 and the height H6 of the cylindrical protrusion. Two through holes 49 and two through holes 50 are installed at positions opposed to the cylindrical protrusion 48, and the second fixed iron core 19 is connected to the cylindrical protrusion 47 and the cylindrical protrusion 48 installed on the first winding frame 21. The through-hole 49 and the through-hole 50 installed in the above are fitted together.

  On the axial direction II side of the first winding frame 21, as shown in FIGS. 3 and 12, a cylindrical upper projection 51 and a cylindrical projection 52 having a height H8 are further provided on the axial direction I side of the second winding frame 31. It installs in the position which opposes the U-shaped convex part 41 and the U-shaped convex part 42. Further, on the axial direction I side of the first winding frame 21, a cylindrical protrusion 53 having the same height H3 as the cylindrical protrusion 43 is formed coaxially with the cylindrical protrusion 51, and is cylindrically coaxial with the cylindrical protrusion 52. A cylindrical projection 54 having the same height H3 as the convex portion 43 is installed, and a lead wire protection hole 55 that penetrates the first winding frame 21 is installed so as to connect the cylindrical projection 51 and the cylindrical projection 53. The winding start lead 39 of the solenoid coil 30 is installed in the lead wire protection hole 55. Further, a lead wire protection hole 56 that penetrates the first winding frame 21 is installed so as to connect the cylindrical projection 52 and the cylindrical projection 54, and the winding end lead 40 of the electromagnetic solenoid coil 30 is installed in the lead wire protection hole 56. To do.

  As shown in FIG. 14, the lead wire protective hole 55 and the lead wire protective hole 56 are disposed further radially inward than the inner diameter of the contact switch coil 20 wound around the first winding frame 21. In order to install the winding start lead 39 and the winding end lead 40 of the electromagnetic solenoid coil 30 in the lead wire protection hole 55 and the lead wire protection hole 56, which are formed in a tunnel shape penetrating the first winding frame 21 made of the electromagnetic solenoid, The winding start lead 39 and the winding end lead 40 of the coil 30 do not need to be provided with a new member that protects and holds the lead wire. For example, for the coil case 9, the first fixed iron core 18, and the second fixed iron core 19. Since it can be electrically insulated and installed, the workability when the solenoid coil is wound around the second winding frame 37 is not deteriorated, and the protruding wire holding portion extending in a protruding manner is Does not occur problems such as damaged, such as during transportation step of the process and the winding frame.

  Next, installation of the contact switch coil body 57 in the coil case 9 will be described with reference to FIGS.

  In the state of the contact switch coil body 57, the cylindrical protrusion 47 having a height H5 installed on the first winding frame 21 has a height H5 higher than the end surface on the axial direction II side of the second fixed iron core 19 having an axial thickness H7. Is projected by a height H51 obtained by subtracting the axial thickness H7 from the end face of the cylindrical protrusion 47, and the end face of the cylindrical protrusion 47 is brought into contact with the end face on the axial direction I side of the third fixed iron core 32 installed in the coil case 9. The axial position of the coil body 57 in the mag switch 10 can be fixed. The height H51 is an axial gap between the second fixed iron core 19 and the third fixed iron core 32 in the mag switch 10, and the dimension of the axial gap flows through the second fixed iron core 19 that is a component of the contact switch 5. The dimension is such that the magnetic flux and the magnetic flux flowing through the third fixed iron core 32 that is a component of the electromagnetic solenoid 8 do not interfere with each other and do not adversely affect the attractive force of the fixed iron cores.

  In the state of the contact switch coil body 57, the cylindrical protrusion 48 having a height H6 installed on the axial direction II side of the first winding frame 21 is from the end surface on the axial direction II side of the second fixed iron core 19 having the axial thickness H7. Also, it protrudes by a height H61 obtained by subtracting the axial thickness H7 from the height H6, and is fitted into a through hole 58 provided at a position facing the cylindrical protrusion 48 on the third fixed iron core 32 shown in FIG. With this fitting, the contact switch coil body 57 is prevented from rotating in the rotational direction with respect to the coil case 9 via the third fixed iron core 32 and the second winding frame 31.

  Since the axial position of the switch coil body 57 is fixed by the cylindrical protrusion 47, the height H 6 of the cylindrical protrusion 48 is equal to the axial thickness H 7 of the second fixed iron core 19 and the second fixed iron core 19. H6 is larger than H7 + H51 (H6> H7 + H51), which is the sum of H51, which is the axial clearance with the third fixed iron core 32, and the tip of the cylindrical protrusion 48 provides a clearance from the end surface of the second winding frame 31. <H7 + H51 + H2 is set.

  As shown in FIG. 8, if the second fixed iron core 19 is formed in a simple disk shape without providing the radially inner bent portion 19a of the second fixed iron core, the first movable iron core 17 is sucked and the first In order to keep the first movable iron core 17 and the second fixed iron core wrapping in the axial direction even when moving to the fixed iron core 18 side, measures such as increasing the plate thickness of the first fixed iron core 17 are taken. Although the length of the mag switch 10 becomes longer, the first movable iron core 17 is attracted and moved to the first fixed iron core 18 side by providing the radially inner bent portion 19a of the second fixed iron core. In addition, since the first movable iron core 17 and the second fixed iron core continue to wrap in the axial direction, a magnetic circuit can be continuously formed by the contact switch 5, so that a small-sized mag switch 10 can be supplied.

  Next, installation of the contact case body 15 on the coil case 9 will be described with reference to FIGS.

  A concave hole 59 is formed on the end surface of the contact case 15a on the axial direction II side so as to face the cylindrical convex portion 34 provided on the axial direction I side of the first winding frame 18, and a position facing the cylindrical convex portion 45. A concave hole 60 is provided at a position facing the cylindrical projection 53, a concave hole 61 is installed at a position facing the cylindrical projection 54, and the concave hole 59 and the concave hole 60 are connected. Are provided with a concave groove 67, a concave groove 68 is provided so as to connect the concave hole 61 and the concave hole 62, and the convex portion or the protrusion and the concave hole are fitted to each other, and the contact switch coil body 57 and the third The contact case body 15 is prevented from rotating in the rotational direction with respect to the coil case 9 via the fixed iron core 32 and the second winding frame 31.

  The contact case body 15 is positioned in the axial direction via an elastic body 63 installed between the first fixed iron core 18 and the contact case body, and the opening on the axial direction I side of the coil case 9 is connected to the contact case. The outer periphery of 15a is fixed by caulking or the like. At the time of this caulking, the elastic body 35 and the elastic body 63 are bent so that the backlash of the internal components can be suppressed, and the end surface on the axial direction II side of the first fixed iron core 18 is the axis of the coil case 9. The coil case 9 and the first fixed iron core 18 are electrically, mechanically, and magnetically joined to contact the stepped portion 9a installed on the direction I side.

  The concave hole 59 is further provided with a small-diameter through hole 59a, and the concave hole 62 is further provided with a small-diameter through hole 62a. The winding start outlet 44 and the winding start outlet 39 are provided in the through hole 59a. And through the through hole 62a, it is drawn out to the axial direction I side of the contact case 15a, and is electrically connected to each external connection terminal 64 and external connection terminal 65. The winding end lead 40 is electrically joined to the first fixed iron core 18 by welding or the like via a notch 45a provided at the end of the cylindrical convex portion 45, and is connected to the ground via the coil case 9. The lead 46 is electrically joined to the first fixed iron core 18 by welding or the like via a notch 53 a provided at the end of the cylindrical convex portion 53 and is grounded via the coil case 9.

  As shown in FIG. 16, the external connection terminal 64 and the external connection terminal 65 are connected to the control unit 66, and the external connection terminal 64 and the external connection terminal 65 are energized by an instruction from the control box 66. The control box 66 may be a known ECU or a dedicated control box for driving the engine starter 1, and a relay or a semiconductor switch for energizing the external connection terminal 64 and the external connection terminal 65 in the control box. An element may be incorporated, or a signal for driving a relay or a semiconductor switch element may be output from a control box.

  Next, the operation of the mag switch 10 will be described.

  When a voltage is applied to the external connection terminal 65 based on an instruction from the control box 66, the solenoid coil 30 of the electromagnetic solenoid 8 is energized through the winding start outlet 39 connected to the external connection terminal 65, 2 The movable iron core 33 is attracted to the third fixed iron core 32. As a result, the pinion moving body 4 moves to the ring gear 7 side via the link bar 6, and the pinion moving body 4 is engaged with the ring gear 7 or moved to the pinion. When the body 4 and the end face of the ring gear 7 are in contact with each other, and then a voltage is applied to the external connection terminal 64 based on an instruction from the control box 66, the winding start outlet connected to the external connection terminal 64 is extracted. The contact switch coil 20 of the contact switch 5 is energized through 44, the first movable iron core 17 is attracted to the first fixed iron core 18, and the movable contact 16 is fixed. When the electric power is supplied from the battery 11 a to the electric motor 2 by contacting the point 12 and the fixed contact 14, the electric motor 2 is rotated, the pinion moving body 4 is rotated through the output shaft 3, and the pinion moving body 4 and the ring gear 7 are rotated. Is engaged, the rotational force is transmitted to the ring gear 7 and the engine is cranked. When the end surfaces of the pinion moving body 4 and the ring gear 7 are in contact with each other, the pinion moving body 4 rotates. As a result, the ring gear 7 meshes with the ring gear 7 and transmits the rotational force to the ring gear 7 to crank the engine.

  The contact switch coil 20 and the solenoid coil 30 have a single winding through which a current flows from the external connection terminal to the ground, but are fixed as a circuit from the external connection terminal to the ground and an energization terminal from the external connection terminal to the motor 2. It is possible to reduce the energization to the contact switch coil 20 and the solenoid coil 30 when the contact to the motor 2 is closed by making a double winding with the circuit to the contact 14.

  In the first embodiment, the electromagnetic solenoid 8 is assembled to the coil case 9, then the contact switch coil body 57 is assembled, and finally the contact case body 15 is assembled to assemble the mag switch 10. However, each of the fitting parts (fittings of protrusions and protrusions, and fittings of holes and grooves) is made into a press-fit dimension, so that the electromagnetic solenoid 8, the contact switch coil body 57, and the contact case body are assembled together in advance before the coil. The case 9 can be easily assembled, and the assembly work can be improved.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 Engine starter 2 Electric motor 3 Output shaft 4 Pinion moving body 5 Contact switch 6 Link bar 7 Ring gear 8 Electromagnetic solenoid 9 Coil case 10 Mag switch 11 Wiring 11a Battery 12 Fixed contact 13 Reed sensor 14 Fixed contact 15 Contact case body 16 Movable contact 17 First movable iron core 18 First fixed iron core 19 Second fixed iron core 19a Radially inner bent portion of second fixed iron core 20 Contact switch coil 21 First winding frame 22 Bush 23 Bush 24 Movable contact shaft 25 Bush 26 Contact push spring 27 Tomewa 28 Tomewa 29 Contact Return Spring 30 Solenoid Coil 31 Second Winding Frame 32 Third Fixed Iron Core 33 Second Movable Iron Core 34 Cylindrical Convex 35 Elastic Body 36 Opening 37 Convex Protrusion 38 Through-hole 39 Unwinding Start 40 Winding End Mouth 41 U U-shaped convex part 42 U-shaped convex part 43 U-shaped groove 44 Winding start outlet 45 Cylindrical convex part 46 Winding end outlet 47 U-shaped groove 48 Cylindrical protrusion 49 Through hole 50 Through hole 51 Cylindrical protrusion 52 Cylindrical shape Protrusion 53 Cylindrical protrusion 54 Cylindrical protrusion 55 Lead wire protection hole 56 Lead wire protection hole 57 Contact switch coil body 58 Through hole 59 Concave hole 60 Concave hole 61 Concave hole 62 Concave hole 63 Elastic body 64 External connection terminal 65 External connection terminal 66 Control box 67 Concave groove 68 Concave groove

Claims (6)

An electric motor,
An output shaft rotated by rotation of the electric motor;
A pinion moving body that fits into a helical spline formed on the output shaft and is movable in the axial direction;
A solenoid coil that generates magnetic force when energized;
An electromagnetic solenoid for transferring the pinion moving body to the ring gear by the suction force of the solenoid coil;
A contact switch coil that generates magnetic force when energized,
A contact switch that opens and closes a current-carrying contact of the electric motor by the attractive force of the contact switch coil,
The electromagnetic solenoid and the contact switch are integrally formed in an axial series,
An engine starting device configured such that an inner diameter of the contact switch coil is larger than an inner diameter of the solenoid coil. The engine starter according to claim 1,
An engine starter in which a lead wire of the solenoid coil passes through a radially inner side of the contact switch coil. The engine starting device according to claim 2,
An engine starting device in which a lead wire protection portion of the solenoid coil is integrally provided in a tunnel shape on a contact switch coil winding frame. The engine starter according to claim 3,
The protective part is
A first protrusion provided on the electromagnetic solenoid side of the winding frame of the switch coil;
A through hole penetrating from the tip of the first protrusion to the axially opposite side of the winding frame of the contact switch coil;
An engine starter in which a lead wire of the solenoid coil passes through the through hole. The engine starting device according to claim 4,
The protective part further comprises a second protrusion on the anti-electromagnetic solenoid side of the winding frame of the contact switch coil,
An engine starter in which the through hole penetrates from the tip of the first projection to the tip of the second projection. The engine starting device according to claim 5,
The protective part is provided in two places on the winding frame of the contact switch coil,
The winding opening lead wire of the solenoid coil passes through the through hole of one of the protection parts,
An engine starter in which a winding end lead wire of the solenoid coil passes through the through hole of the other protection portion.