JP2009059682A - Magnet switch and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a translatory magnet switch which excels in resistance to impact and vibration and is easy to produce. <P>SOLUTION: A plurality of thin plates having the same shape are stacked to form a disk portion 61 of fixed iron core 6. A coil lead-out aperture 63 is formed in each thin plate. Projected portions 64 of respective thin plates 61a are superposed to stack them and pressed to fit the projected portions 64 into projection engaging holes 65 of the thin plates 61b to form the disk portion 61. Preferably, this process is performed before it is assembled with a base portion 60. The base portion 60 is pressed into the disk portion 61, the tip a minor diameter portion 60b of the base portion 60 is deformed plastically by caulking outside to be pressed to the thin plate 61a in the disk portion 61, and then the disk portion 61 is mechanically connected to the base portion 60. The thin plate 61b of the disk portion 61 has a recess 62 for holding the plastically deformed portion of the base portion 60, which prevents the disk portion 61 from projecting into a rubber packing 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a magnet switch for opening and closing a switch provided, for example, in an energization circuit of a starter motor and a manufacturing method thereof.

Patent Document 1 discloses that a disk portion formed by laminating a plurality of thin plate-like plates, an axially facing face of a movable iron core, and an end on the non-movable iron core side are press-fitted into a base through hole of the disk portion. A magnet switch having a cylindrical base portion is proposed. The coil lead wire of this magnet switch is drawn out in the axial direction through a groove provided on the periphery of the disk portion. Further, the outermost thin plate of the disk portion has a cut-and-raised piece for holding the end of the coil.
JP-T-2002-524826

(Object of invention)
However, in the prior art described in Patent Document 1, it is necessary to align the positions of the grooves formed in each thin plate when fixing the disk portion to the base portion. That is, it is necessary to fix a plurality of thin plates to the base portion one by one while aligning the positions of the grooves. Alternatively, it is necessary to fix the thin plates to the base portion while maintaining the aligned state. For this reason, there has been a problem that the assembling work becomes complicated and the skill level required of the worker increases.

  In addition, since the thin plate placed on the outermost side of the disk portion is provided with a cut and raised piece, when the end of the coil is soldered to the surface of the thin plate, the cut and raised piece becomes an obstacle and the workability is reduced. did.

  Furthermore, since the impact force when the movable iron core collides with the base portion is transmitted to the end portion of the coil soldered to the surface of the thin plate, the cut and raised piece provided on the thin plate firmly holds the end portion of the coil. For this reason, it is necessary to provide a cut and raised piece on the thin plate disposed on the outermost side of the disk portion, and the shape is different from other thin plates, resulting in an increase in cost.

  That is, in the magnet switch disclosed in Patent Document 1, each thin plate and base portion of the disk portion that forms a part of the fixed iron core are machined to ensure impact resistance while simplifying the process to reduce manufacturing costs. It was necessary to further improve the mechanical connectivity.

  The present invention has been made in view of the above problems, and an object thereof is to provide a direct-acting magnet switch capable of improving impact resistance while suppressing the complexity of the manufacturing process.

(Summary of the Invention)
Each invention made to achieve the above object is wound around a movable core that axially drives a movable contact member housed in a recess of the switch cover, and a coil bobbin that surrounds the movable core, as in the prior art. A coil that drives the movable iron core in the axial direction by energization, a disk-shaped disk part that is sandwiched between the end wall of the coil bobbin and the switch cover and forms a part of the fixed core, and a part of the fixed core A cylindrical base portion that is axially disposed on the movable iron core and has an end on the non-movable iron core side inserted into a base through hole of the disk portion, and a disk portion that is in contact with an end surface of the disk portion on the switch cover side And a sealing member sandwiched between the switch cover and the disk portion is applied to a direct acting magnet switch configured by laminating a plurality of annular plate-like thin plates. Hereinafter, it is also referred to as a magnet switch in which a laminated disk portion and a base portion are combined.

  The sealing member is made of rubber packing, for example. This rubber packing is arranged between the disk part and the switch cover and seals the contact accommodating space in the switch cover from the outside, or when the movable contact member is displaced to the disk part side, etc. Can have a function of mitigating the impact of collision with the disk portion.

(First invention)
In the magnet switch according to the first aspect of the invention, each thin plate has an opening for communicating with each other so as to lead the lead wire of the coil through the disk portion in the axial direction. The remaining thin plates excluding one thin plate each have a protruding portion that protrudes in the axial direction and overlaps each other, and one or more thin plates on the outer side in the axial direction insert and fix the protruding portion. It is characterized by having.

  Thereby, it is possible to realize a magnet switch capable of improving impact resistance while suppressing the complexity of the manufacturing process. More specific description will be given below.

  According to this invention, since the remaining thin plates excluding one or more thin plates on the outside in the axial direction have projections that protrude in the axial direction and overlap each other, these thin plates can be aligned in the plane direction, By performing the assembling work in this state, it is possible to satisfactorily prevent the thin plates from moving in parallel to each other and hindering the communication between the openings of the thin plates.

  In addition, in these thin plate groups whose movement in the surface direction is suppressed by the fitting of the respective projections, the projections are fitted and fixed in the projection insertion holes of one or more thin plates on the outside in the axial direction. As a result, the relative movement of all the thin plates can be restricted, and one or more thin plates on the outside in the axial direction can be mechanically coupled to the remaining thin plates.

  Therefore, if a cylindrical base is inserted into the center hole (also referred to as a base through-hole) of this disk portion and the both are mechanically coupled, the disk portion and the base portion can be secured while ensuring good communication between the coil outlets. Can be performed without requiring skill. Preferably, before assembling the disk part to the base part, a plurality of thin plates are overlapped with the protrusions and the protrusions are press-fitted into the protrusion insertion holes, whereby each thin plate constituting the disk part Relative movement is prohibited. As a result, the subsequent assembling work of the disk portion and the base portion becomes very easy.

  In addition, after assembly, relative displacement between the thin plates can be prevented by a strong impact force from the outside, and impact resistance can be improved.

  Further, according to the present invention, a protrusion insertion hole portion into which a protrusion portion of another thin plate is press-fitted is provided in the thin plate on the outer side in the axial direction of the disk portion. Thereby, although the relative movement of each thin plate is restricted by the alignment protrusion, the protrusion does not protrude in the axial direction from the end surface of the disk portion. For this reason, even if a strong impact or vibration is applied from the outside, for example, the protrusion does not give a strong stress to the end face of the adjacent coil bobbin or the end face of the sealing member, and the impact resistance can be improved. .

  In addition, when the number of thin plates having the protrusion insertion holes is one, it is preferable to make the thickness thicker than other thin plates in terms of improving rigidity.

  Further, it is preferable that the protrusion is completely immersed in the protrusion insertion hole. That is, in the above invention, even if the protrusion protrudes slightly in the axial direction from the protrusion insertion hole, the above-mentioned impact resistance improvement effect is exhibited, but when fully immersed, the disk portion and the coil bobbin or sealing member are Since the surface can be contacted widely, the impact resistance improvement effect can be further improved.

  Further, each thin plate preferably has a protrusion at a rotationally symmetric position. Thereby, the overlapping of the protrusions becomes easy. The rotationally symmetric position mentioned here is preferably a 180 degree rotationally symmetric position, but is not limited thereto. Further, it is preferable that the protrusion is disposed at a position 90 degrees away from the opening for drawing out the coil.

(Second invention)
In the magnet switch of the second invention, each thin plate has an opening for communicating with each other so as to lead the coil lead wire through the disk portion in the axial direction. The remaining thin plate excluding the thin plate is caulked and fixed to the base portion by plastically deforming the distal end portion of the base portion on the movable contact member side to the outside of the diameter, and the base through one or more thin plates on the sealing member side The hole is characterized by being formed in a large diameter so as to accommodate a plastically deformed portion of the base portion.

  Thereby, it is possible to realize a magnet switch capable of improving impact resistance while suppressing the complexity of the manufacturing process. More specific description will be given below.

  According to the present invention, since the remaining thin plates excluding one or more thin plates on the sealing member side are fixed to each other, the opening portions of the thin plates are shifted in the plane parallel, particularly in the circumferential direction, in the assembling operation. It is possible to satisfactorily suppress the hindrance to the communication of the opening. Therefore, if a cylindrical base is inserted into the center hole (also referred to as a base through-hole) of this disk portion and the both are mechanically coupled, the disk portion and the base portion can be secured while ensuring good communication between the coil outlets. Can be performed without requiring skill.

  In addition, after assembly, relative displacement between the thin plates can be prevented by a strong impact force from the outside, and impact resistance can be improved.

  In the present invention, the remaining thin plate excluding one or more thin plates on the sealing member side is caulked and fixed to the base portion by plastically deforming the distal end portion of the base portion on the movable contact member side radially outward, The base through hole of one or more thin plates on the soft sealing member side is formed with a large diameter so as to accommodate a plastically deformed portion of the base portion. Thereby, the caulking deformation part of the base part does not protrude from the end face of the disk part to the sealing member side. For this reason, for example, even if a strong impact or vibration is applied from the outside, this caulking deformation portion does not give a strong stress to the end face of the adjacent sealing member, and even when a strong impact is applied from the outside, Fatigue and other problems of the sealing member can be prevented.

  Preferably, the diameter increase of the base through hole of one or more thin plates on the sealing member side is preferably formed as small as possible within a range in which the caulking deformation portion of the base portion can be accommodated. . Thereby, the increase in the magnetic resistance of the fixed iron core and the decrease in the amount of magnetic flux can be minimized.

  In addition, when the number of thin plates with the diameter of the base through-hole positioned on the outermost side on the sealing member side is set to one, the thickness is made thicker than other thin plates in order to improve rigidity. It is suitable.

  The base through-hole of one or more thin plates on the sealing member side completely accommodates the plastically deformed portion of the base portion in the axial direction. Thereby, since the disk portion and the sealing member can be brought into surface contact widely, the impact resistance improvement effect can be further improved.

  In a preferred embodiment, the remaining thin plates excluding one or more of the thin plates on the sealing member side have protrusions that protrude in the axial direction and overlap each other, and are on the outer side in the axial direction on the soft sealing member side. One or more thin plates have a protrusion insertion hole into which a protrusion is inserted and fixed. If it does in this way, fixing of each thin plate can be performed simply, ensuring the position alignment of the opening part for pulling out a coil lead wire, and it can show | play together the effect of the said 1st invention.

(Third invention)
In the magnet switch of the third invention, each thin plate has an opening for communicating with each other and pulling out a coil lead wire through the disk portion in the axial direction, and all of the thin plates protrude in the axial direction. Each of the flexible sealing members has protrusions that overlap each other, and the soft sealing member has a recess or a hole that accommodates the protrusions.

  Thereby, it is possible to realize a magnet switch capable of improving impact resistance while suppressing the complexity of the manufacturing process. More specific description will be given below.

  According to the present invention, since the thin plates are aligned with each other by the axial overlap of the alignment protrusions, in this state, the disk portion, that is, the thin plate and the base portion are assembled by, for example, caulking. It is possible to satisfactorily prevent the thin plates from moving in parallel to each other and hindering the communication of the openings of the thin plates.

  In addition, after assembly, relative displacement between the thin plates can be prevented by a strong impact force from the outside, and impact resistance can be improved.

  Therefore, if a cylindrical base is inserted into the center hole (also referred to as a base through-hole) of this disk portion and the both are mechanically coupled, the disk portion and the base portion can be secured while ensuring good communication between the coil outlets. Can be performed without requiring skill. Preferably, before assembling the disk portion to the base portion, the protrusions of the thin plates are overlapped, thereby prohibiting relative movement of the thin plates constituting the disk portion. As a result, the subsequent assembling work of the disk portion and the base portion becomes very easy.

  Furthermore, in this invention, since one of the end wall portion of the bobbin and the sealing member has a recess or a hole portion that accommodates the projection portion, the relative movement of each thin plate is regulated by the alignment projection. The protrusion does not protrude in the axial direction from the end surface of the disk portion. For this reason, even if a strong impact or vibration is applied from the outside, for example, the protrusion does not give a strong stress to the end face of the adjacent coil bobbin or the end face of the sealing member, and the impact resistance can be improved. .

(Fourth invention)
According to a fourth aspect of the present invention, the magnet switches are fixed to each other so that the thin plates communicate with each other and have openings for pulling the coil lead wires through the disk portion in the axial direction. The thin plate is caulked and fixed to the base portion by plastically deforming the distal end portion of the base portion on the movable contact member side outward, and the sealing member is formed in a large diameter so as to accommodate the plastically deformed portion of the base portion. It is characterized by that.

  Thereby, it is possible to realize a magnet switch capable of improving impact resistance while suppressing the complexity of the manufacturing process. More specific description will be given below.

  According to the present invention, since the thin plates are fixed to each other, it is possible to satisfactorily prevent the openings of the thin plates from being displaced in parallel with each other, particularly in the circumferential direction, during assembly work, thereby preventing the communication of the openings of the thin plates. be able to. Therefore, if a cylindrical base is inserted into the center hole (also referred to as a base through-hole) of this disk portion and the both are mechanically coupled, the disk portion and the base portion can be secured while ensuring good communication between the coil outlets. Can be performed without requiring skill.

  In addition, after assembly, relative displacement between the thin plates can be prevented by a strong impact force from the outside, and impact resistance can be improved.

  Further, in the present invention, the outermost thin plate closest to the contact is caulked and fixed to the base portion by plastically deforming the distal end portion on the movable contact member side of the base portion to the radially outer side, and the sealing member is made of plastic of the base portion. Since the deformed portion is formed in a large diameter so as to accommodate the deformed portion, the plastically deformed portion of the base portion does not protrude from the end surface of the disk portion to the sealing member side. For this reason, for example, even if a strong impact or vibration is applied from the outside, this caulking deformation portion does not give a strong stress to the end face of the adjacent sealing member, and even when a strong impact is applied from the outside, Fatigue and other problems of the soft sealing member can be prevented.

  Preferably, the above-described increase in the diameter of the sealing member is preferably as small as possible within a range in which the caulking deformation portion of the base portion can be accommodated.

(Fifth invention)
The magnet switch of the fifth invention is characterized in that the thin plate (61b) located on the outermost side on the contact side is formed thicker than the other thin plates (61a).

  In this way, since the last thin plate is thick, deformation rigidity can be ensured and warping of the last thin plate can be suppressed.

  The thin plate (61b) is preferably 2 to 5 times the thin plate (61a).

  Preferably, the thin plate (61b) and the plurality of thin plates (61a) are overlapped and punched so that the thin plate (61b) is recessed toward the thin plate (61a), and the thin plate (61b) and the plurality of thin plates (61a) ). In this way, the manufacturing process of the disk part can be simplified. Moreover, since it is not necessary to provide a hole in the thick thin plate (61b), it is possible to ensure elastic deformability and enhance the warping rigidity without incurring a thickening that deteriorates the shock absorption.

  A preferred embodiment of the magnet switch of the present invention will be described below.

(Embodiment 1)
(overall structure)
The overall structure of the magnet switch is shown in FIG. 1 which is an axial sectional view, and the circuit configuration is shown in FIG.

  The magnet switch 1 is used in a starter (not shown) for starting an automobile engine and has a function of opening and closing a main contact (described later) provided in a motor energization circuit (referred to as a motor circuit). And a solenoid 2 forming an electromagnet and a switch cover 3 fixed to the solenoid 2.

  The solenoid 2 includes a switch case 4 forming a yoke, a coil 5 housed in the switch case 4, a fixed iron core 6 magnetized by energization of the coil 5, and a sleeve 7 on the inner periphery of the coil 5. A plunger 8 (movable iron core) that is slidably inserted through the shaft 8, and a shaft 9 that moves integrally with the plunger 8.

  The coil 5 includes a suction coil 5 a that generates a magnetic force for attracting the plunger 8, and a holding coil 5 b that generates a magnetic force for retaining the attracted plunger 8. Two coils are formed on the resin coil bobbin 10. It is wound in a state.

  The fixed iron core 6 is made of, for example, a soft magnetic metal such as a soft iron material, and forms a gap magnetic circuit interlinking with the coil 5 together with the switch case 4 and the plunger 8. To be precise, the switch case 4 also has a function as a fixed iron core, that is, a fixed magnetic path member. In this embodiment, the fixed magnetic path member extending in the radial direction adjacent to the contact side of the coil 5 is used as the fixed iron core. 6 is called. The detailed configuration of the fixed iron core 6 will be described later.

  The plunger 8 is disposed on the inner peripheral side of the sleeve 7 so as to face the fixed iron core 6, and in a direction opposite to the iron core (left direction in FIG. 1) by a return spring 11 disposed between the plunger 8. An air gap is secured between the fixed iron core 6 and the energized state in a non-energized state.

  The shaft 9 has a flange portion 9a at one end. The flange portion 9 a is fixed to the end surface of the plunger 8 and moves integrally with the plunger 8. The other end of the shaft 9 passes through a central hole 6 a formed in the fixed iron core 6 and enters a contact chamber 12 formed inside the switch cover 3.

  The switch cover 3 is, for example, a resin molded product. The switch cover 3 is disposed with a rubber packing 13 interposed between the switch core 3 and the switch cover 3. The switch cover 3 is caulked and fixed to the tip of the switch case 4. 12 is formed.

  The main contact includes a set of fixed contacts 16 connected to the motor circuit via two external terminals 14 and 15 fixed to the switch cover 3, and a movable contact 17 that intermittently connects between the set of fixed contacts 16. And formed.

  The movable contact 17 is attached to the end of the shaft 9 entering the contact chamber 12 via an insulating member 18, and is a contact pressure spring 19 disposed between the flange portion 9 a of the shaft 9 and the insulating member 18. Accordingly, the shaft 9 is urged toward the distal end direction (the right direction in FIG. 6), and comes into contact with the stopper member 20 attached to the distal end portion of the shaft 9 to prevent the shaft 9 from coming off.

  As shown in FIG. 2, the two external terminals 14 and 15 are a B terminal 14 connected to the in-vehicle battery 22 via the battery cable 21 and an M terminal 15 to which a lead wire taken out from the motor is connected. is there.

(Description of operation)
When the coil 5 is energized by turning on the start switch 25, an electromagnet is formed and the fixed iron core 6 is magnetized, so that an attractive force acts between the base portion 60 of the fixed iron core 6 and the plunger 8. The plunger 8 moves to the base portion 60 side (the right direction in FIG. 6) while pushing and shrinking the return spring 11. By the movement of the plunger 8, the shaft 9 fixed to the plunger 8 is pushed out, and the movable contact 17 supported on the end portion of the shaft 9 comes into contact with the set of fixed contacts 16. Thereafter, the plunger 8 further moves while pressing and contracting the contact pressure spring 19, and comes into contact with the end surface of the base portion 60 and stops.

  As a result, the compressive load of the contact pressure spring 19 is applied to the movable contact 17, and the movable contact 17 is pressed against the set of fixed contacts 16, whereby the main contact is closed and power is supplied from the battery 22 to the motor. . After the engine is started, when the start switch 25 is turned off to stop the energization of the coil 5 and the attraction force of the electromagnet disappears, the plunger 8 is pushed back toward the anti-base portion by the reaction force of the return spring 11. 17 is separated from the set of fixed contacts 16 and the main contacts are opened, and the power supply to the motor is stopped.

(Fixed iron core 6)
The fixed iron core 6 that characterizes this embodiment will be described with reference to FIGS. 1, 3, and 4. The fixed iron core 6 includes a base portion 60 that faces the plunger (movable iron core) 8 in the axial direction, and a disk portion 61 that is fitted and fixed to the base portion 60 and disposed on one end side of the coil 5. The

  As shown in FIG. 1, the base portion 60 is a cylindrical body having a central hole 6 a formed at the center, and a large diameter portion 60 b that is press-fitted into the disc portion 61 and a large diameter that fits into the inner periphery of the sleeve 7. And a diameter portion 60c. The small diameter portion 60 b disposed on the side of the base portion 60 opposite to the movable core is press-fitted into the base through hole 61 c of the disc portion 61.

  The disk part 61 is configured by stacking a number of soft iron thin plates formed in the same shape. The disk portion 61 is sandwiched between the end wall portion of the coil bobbin 10 and the switch cover 3 in the axial direction. More specifically, as shown in FIG. 1, the rubber packing 13 (also referred to as a sealing member or a soft sealing member) extends in the radial direction in contact with the end surface of the disk portion 61 on the switch cover 3 side. The outer peripheral edge of the rubber packing 13 is sandwiched between the outer peripheral edge of the disc portion 61 and the peripheral wall tip of the switch cover 3. The distal end portion of the peripheral wall of the switch case 4 is caulked to the outer peripheral surface of the switch cover 3 so as to cover the outer peripheral surface of the disk portion 61 and the rubber packing 13.

  As shown in FIG. 4, the disk portion 61 has two coil outlets 63 and two crimping portions described later. The coil outlet 63 is an opening for drawing the end of the coil 5 to the opposite coil side of the disk portion 61 (the right side of the disk portion 61 shown in FIG. 6).

(Disk 61)
The disk unit 61 will be described in more detail with reference to FIGS.

  The disk portion 61 is formed by stacking nine thin plates 61a formed thin and one thin plate 61b formed in contact with the rubber packing 13 side. As shown in FIG. 4, the coil outlets (openings referred to in the present invention) 63 of the thin plates 61a and 61b are formed in the same shape and aligned at the same position in the circumferential direction, so that a single axial direction is obtained. A through hole is formed. Each thin plate 61a is formed in the same shape and has two protrusions 64 for alignment that protrude toward the rubber packing 13 side. The two protrusions 64 of each thin plate 61 a are disposed at a rotationally symmetric position with respect to each other by 180 degrees and are formed to be shifted by approximately 90 degrees with respect to the coil outlet 63. Each protrusion 64 overlaps in the axial direction, and relative displacement in the surface direction of each thin plate 61b is prohibited. The thin plate 61 b has a protrusion insertion hole 65 into which the protrusion 64 is press-fitted at the same position as the protrusion 64. The thin plate 61b has a thickness such that the protruding portion 64 press-fitted into the protruding portion insertion hole 65 does not contact the rubber packing 13 side.

  The thin plate 61b has a recess 62 formed by recessing a part of the base through-hole 61c in the radially outward direction (see FIG. 4). Each thin plate 61 a is caulked and fixed to the base portion 60 by plastically deforming the small diameter portion 60 b of the base portion 60 outward in the diameter. The recessed portion 62 accommodates the plastic deformation portion 60 c of the small diameter portion 60 b of the base portion 60. This prevents the plastic deformation portion 60c from protruding toward the rubber packing 13 in the axial direction. The thin plate 61b has such a thickness that the plastic deformation portion 60c does not protrude toward the rubber packing 13 side. The recess 62 has a circumferential width that can accommodate the plastic deformation portion 60c.

  Thereby, each thin plate 61a and thin plate 61b are coupled sufficiently firmly even if a strong impact force or vibration force is applied from the outside, and the protrusion 64 and the plastic deformation portion 60c damage the rubber packing 13. There is no.

(Description of manufacturing process)
The assembly work of the disk part 61 and the base part 60 will be described below.

  The coil outlet 63, the protrusion insertion hole 65, the base through hole 61c, and the recess 62 are formed by pressing. In this embodiment, the protrusions 64 are simultaneously formed by this pressing.

  Next, the thin plates 61a are stacked in a state where the protrusions 64 are stacked, and the protrusions 64 are press-fitted into the protrusion insertion holes 65 of the thin plate 61b. Preferably, the stacked protrusions 64 are pressed into each other. Thereby, since each laminated thin plate 61a is united, it is easy to handle.

  Next, the small diameter portion 60b of the base portion 60 is press-fitted into the base through hole 61c of the integrated disk portion 61, and the tip of the small diameter portion 60b is caulked outward as described above. In FIG. 6, reference numeral 60d denotes a step end face provided on the outer peripheral surface of the base portion 60. This step end face 60d is the closest to the coil bobbin 10 side among the thin plates 61a and 61b constituting the disc portion 61 during the caulking. It is pressed against the thin plate 61a.

(Modification)
In the above embodiment, the thin plate 61b on the rubber packing 13 side is thicker than the other thin plate 61a. However, the thin plate 61a may be configured by stacking a plurality of thin plates having the same thickness as the thin plate 61a. Thereby, material and a structure can be simplified.

(Modification)
In the above embodiment, the thin plate 61a having the protrusion fitting hole 65 is disposed on the rubber packing 13 side, but may be provided on the coil bobbin 10 side. Even in this case, the protrusion 64 can prevent local stress concentration from occurring on the end wall of the coil bobbin 10. However, in this case, it is necessary to provide the recess 62 on the outermost thin plate 61a on the rubber packing 13 side.

(Modification)
In the above embodiment, the recess 62 is provided in the base through hole 61c of the thin plate 61a. However, the diameter of the base through hole 61c itself of the thin plate 61a may be increased. However, in this case, the magnetic characteristics of the fixed iron core 6 are somewhat deteriorated.

(Embodiment 2)
A second embodiment will be described with reference to FIG.

  In the second embodiment, the disk unit 61 is configured by laminating only a total of nine thin plates 61a described in the first embodiment, and the thin plate 61b of the first embodiment is omitted. However, in the second embodiment, the rubber packing 13 constituting the soft sealing member referred to in the present invention corresponds to the hollow portion 132 corresponding to the hollow portion 62 described in the first embodiment or the protrusion fitting hole 65. It has the hole part 131 to do. The hole 131 has a diameter that does not contact the protrusion 64. Further, the protruding portion 64 and the plastic deformation portion 60c are provided in a portion where there is no hindrance to the operation of each member on the switch side such as the movable contact 17. In addition, it is more preferable that the protrusions 64 are pressed into each other when the protrusions 64 are overlapped with each other and the thin plates 61a are stacked. However, the present invention is not limited to this.

(Embodiment 3)
A third embodiment will be described with reference to FIGS. The main feature of the third embodiment is that the structure of the disk unit 61 of the first embodiment shown in FIG. 6 is changed.

  As in the first embodiment, the disk portion 61 of this embodiment is configured by laminating nine thin plates 61a and one thin plate 61b in the axial direction. The thickness of the thin plate 61b is 2 to 5 times, more preferably 3 to 4 times the thickness of the thin plate 61a. Thereby, elastic deformability and rigidity can be well balanced. However, each thin plate 61a protrudes in the opposite contact direction opposite to the thin plate 61a of the first embodiment shown in FIG. Furthermore, the thick thin plate 61b also has a projection 66, and this projection 66 is press-fitted into a recess on the back side of the projection 64 of the adjacent thin plate 61a. In this way, since it is not necessary to provide the projection portion insertion hole 65 in the thin plate 61b, the processing cost can be reduced, and the rigidity of the thin plate 61b that requires rigidity can be enhanced as described later.

  In this embodiment, the rubber packing 13 of the first embodiment is omitted. Thereby, the whole rigidity can be strengthened.

  Furthermore, in this embodiment, the distal end portion on the contact side of the small diameter portion 60b of the base portion 60 is caulked and fixed to the base portion 60 by plastic deformation to the outside of the diameter.

(Description of manufacturing process)
The manufacturing and assembling processes of the disk unit 61 and the base unit 60 are essentially the same as those of the first embodiment. However, in this embodiment, by punching in a state where nine thin plates 61a and one thin plate 61b are overlapped, the projecting portion 64 and the projecting portion 66 are produced at a time and fitted together. Thereby, a total of ten thin plates 61a and 61b can be integrated at once.

(Modification)
In the case of the large disk portion 61, for example, the six thin plates 61a are punched to form the projections 64 at once, and the remaining four thin plates 61a and 61b are punched to project the projections 64, 66 may be formed at once, and then the two thin plate groups may be overlapped and integrated by press-fitting the protrusions 64 and 64. Thereby, the large sized disk part 61 can be manufactured easily.

(Effect of thick thin plate 61b)
The disk part 61 made of laminated steel plates of the magnet switch 1 of this embodiment described above has a thin plate 61b thicker than the other thin plates 61a on the axial contact side. In this way, the following effects are obtained.

  First, when the plunger 8 collides with the base portion 60, the impact force is sequentially transmitted through the thin plates 61a of the disc portion 61 and finally reaches the thin plate 61b. The thin plate 61a is less deformed because the impact force applied from the adjacent thin plate 61a is transmitted to the next thin plate 61a. On the other hand, since the thin plate 61b transmitted last is not adjacent to the thin plate to be transmitted next, if it has the same thickness as the other thin plate 61a, deformation is likely to occur. On the other hand, in this embodiment, since the last thin plate 61b is made thick, it can have rigidity to withstand this deformation. That is, it is possible to suppress plastic deformation, that is, warpage of the last thin plate 61b.

  Next, the disk portion 61 is configured by laminating a large number of thin plates 61a and 61b, and the elastic deformability of each of the thin plates 61a and 61b is much higher than that in the case where the disk portion 61 is manufactured from an integrated mild steel. growing. As a result, the disk portion 61 made of laminated steel sheets can absorb the collision impact satisfactorily. This means that the kinetic energy of the plunger 8 is softly absorbed by the disk portion 61 through the base portion 60. This means that the collision impact force between the movable contact 17 connected to the plunger 8 and the fixed contact 16 can be reduced. As a result, contact wear can be greatly reduced.

It is an axial sectional view of the direct acting magnet switch of the first embodiment. FIG. 2 is a circuit diagram of the direct acting magnet switch of FIG. 1. It is a typical axial direction sectional view of a fixed iron core. However, cross-sectional hatching in the disk portion is omitted. It is the front view seen from the rubber packing side of the fixed iron core of FIG. It is a model expanded axial direction sectional view of the disc part of a fixed iron core. However, cross-sectional hatching in the disk portion is omitted. It is a partial axial direction sectional view which expands and shows the principal part of a fixed iron core. It is a partial front view which expands and shows the principal part of a fixed iron core. FIG. 6 is a partial axial cross-sectional view illustrating an enlarged main part of a fixed iron core according to a second embodiment. It is an axial sectional view showing the fixed iron core of the third embodiment. FIG. 10 is a partial axial cross-sectional view illustrating an enlarged main part of the fixed iron core in FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnet switch 2 Solenoid 3 Switch cover 4 Switch case 5 Coil 5a Suction coil 5b Holding coil 6 Fixed iron core 6a Center hole 7 Sleeve 8 Plunger (movable iron core)
9 Shaft 9a Flange 10 Coil bobbin 11 Return spring 12 Contact chamber 13 Rubber packing (soft sealing member)
14 External terminal 16 Fixed contact 17 Movable contact 18 Insulating member 19 Contact pressure spring 20 Stopper member 21 Battery cable 22 Battery 25 Start switch 60 Base part 60b Small diameter part 60c Plastic deformation part 60d Step end face 61 Disk part 61a Thin plate 61b Thin plate 61c Base penetration Hole 62 Recessed part 63 Coil outlet 64 Protrusion part 65 Protrusion part insertion hole part 66 Protrusion part 131 Protrusion part insertion hole part 132 Depression part

Claims (11)

A movable iron core for driving the movable contact member housed in the recess of the switch cover in the axial direction;
A coil wound around a coil bobbin surrounding the movable core and driving the movable core in the axial direction by energization;
A disk-shaped disk portion sandwiched between an end wall portion of the coil bobbin and the switch cover and forming a part of a fixed iron core;
A cylindrical base part that is axially opposed to the movable iron core as a part of the fixed iron core and has an end on the non-movable iron core side fitted into the base through hole of the disk part;
A sealing member sandwiched between the disk portion and the switch cover while being in contact with the end surface of the disk portion on the switch cover side;
With
The disk part is a magnet switch configured by laminating a plurality of thin plate-like plates,
Each of the thin plates has an opening for communicating with each other and for drawing out the lead wire of the coil in the axial direction through the disk portion,
The remaining thin plates other than the one or more thin plates on the outer side in the axial direction have protrusions that protrude in the axial direction and overlap each other.
The magnet switch according to claim 1, wherein one or a plurality of the thin plates on the outside in the axial direction has a protrusion insertion hole into which the protrusion is inserted and fixed. The magnet switch according to claim 1, wherein
The protrusion is a magnet switch that is immersed in the protrusion insertion hole. The magnet switch according to claim 1, wherein
Each said thin plate is a magnet switch which has the said projection part in a rotationally symmetric position. A movable iron core for driving the movable contact member housed in the recess of the switch cover in the axial direction;
A coil wound around a coil bobbin surrounding the movable core and driving the movable core in the axial direction by energization;
A disk-shaped disk portion sandwiched between an end wall portion of the coil bobbin and the switch cover and forming a part of a fixed iron core;
A cylindrical base part that is axially opposed to the movable iron core as a part of the fixed iron core and has an end on the non-movable iron core side fitted into the base through hole of the disk part;
A sealing member sandwiched between the disk portion and the switch cover while being in contact with the end surface of the disk portion on the switch cover side;
With
The disk portion is a direct acting magnet switch configured by laminating a plurality of thin annular plates.
Each of the thin plates is fixed to each other with an opening for communicating with each other and for drawing out the lead wire of the coil through the disk portion in the axial direction.
The remaining thin plates excluding the one or more thin plates on the sealing member side are caulked and fixed to the base portion by plastically deforming the distal end portion on the movable contact member side of the base portion to the outside of the diameter,
The magnet switch according to claim 1, wherein the base through hole of the one or more thin plates on the sealing member side is formed to have a large diameter so as to accommodate the plastically deformed portion of the base portion. The magnet switch according to claim 4, wherein
The magnet switch in which the thickness of the one or more thin plates on the sealing member side is formed larger than the axial height of the plastically deformed portion of the base portion. The magnet switch according to claim 4, wherein
The remaining thin plates excluding one or a plurality of the thin plates on the sealing member side have protrusions that protrude in the axial direction and overlap each other,
The one or more thin plates on the outer side in the axial direction on the sealing member side are magnet switches having protrusion insertion holes into which the protrusions are inserted and fixed. A movable iron core for driving the movable contact member housed in the recess of the switch cover in the axial direction;
A coil wound around a coil bobbin surrounding the movable core and driving the movable core in the axial direction by energization;
A disk-shaped disk portion sandwiched between an end wall portion of the coil bobbin and the switch cover and forming a part of a fixed iron core;
A cylindrical base part that is axially opposed to the movable iron core as a part of the fixed iron core and has an end on the non-movable iron core side fitted into the base through hole of the disk part;
A sealing member sandwiched between the disk portion and the switch cover while being in contact with the end surface of the disk portion on the switch cover side;
With
The disk portion is a type magnet switch configured by laminating a plurality of thin plate-like plates,
Each of the thin plates has an opening for communicating with each other and for drawing out the lead wire of the coil in the axial direction through the disk portion,
All of the thin plates have protrusions that protrude in the axial direction and overlap each other,
The direct acting magnet switch according to claim 1, wherein the sealing member has a recess or a hole for accommodating the protrusion. A movable iron core for driving the movable contact member housed in the recess of the switch cover in the axial direction;
A coil wound around a coil bobbin surrounding the movable core and driving the movable core in the axial direction by energization;
A disk-shaped disk portion sandwiched between an end wall portion of the coil bobbin and the switch cover and forming a part of a fixed iron core;
A cylindrical base part that is axially opposed to the movable iron core as a part of the fixed iron core and has an end on the non-movable iron core side fitted into the base through hole of the disk part;
A sealing member sandwiched between the disk portion and the switch cover while being in contact with the end surface of the disk portion on the switch cover side;
With
The disk part is a magnet switch configured by laminating a plurality of thin plate-like plates,
Each of the thin plates is fixed to each other with an opening for communicating with each other to lead the coil lead wire through the disk portion in the axial direction,
The thin plate on the most contact side is caulked and fixed to the base portion by plastically deforming the distal end portion on the movable contact member side of the base portion outward in diameter,
The magnet switch according to claim 1, wherein the quality sealing member is formed to have a large diameter so as to accommodate the plastically deformed portion of the base portion. A movable iron core for driving the movable contact member housed in the recess of the switch cover in the axial direction;
A coil wound around a coil bobbin surrounding the movable core and driving the movable core in the axial direction by energization;
A disk-shaped disk portion sandwiched between an end wall portion of the coil bobbin and the switch cover and forming a part of a fixed iron core;
A cylindrical base part that is axially opposed to the movable iron core as a part of the fixed iron core and has an end on the non-movable iron core side fitted into the base through hole of the disk part;
A sealing member sandwiched between the disk portion and the switch cover while being in contact with the end surface of the disk portion on the switch cover side;
With
The disk part is a magnet switch configured by laminating a plurality of thin plate-like plates,
The magnet switch characterized in that the thin plate (61b) located on the outermost side on the contact side is formed thicker than the other thin plates (61a).   The magnet switch according to claim 9, wherein the thin plate (61b) is 2 to 5 times the thin plate (61a).   By punching the thin plate (61b) and the plurality of thin plates (61a), the thin plate (61b) is recessed toward the thin plate (61a), and the thin plate (61b) and the plurality of thin plates ( The method for manufacturing a magnet switch according to claim 9, wherein 61a) is integrated.

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