JP4356603B2 - Magnetic switch for starter - Google Patents

Description

  The present invention relates to a starter magnet switch, and more particularly to a contact structure thereof.

  For example, a conventional starter magnet switch described in Patent Document 1 below includes a solenoid coil (hereinafter also referred to as an excitation coil) and a main member such as a magnetic path member that is linked to the excitation coil. A resin contact cover is caulked and fixed to one end surface of the switch body portion, and a movable contact member and a pair of fixed contacts are placed in a recess (hereinafter also referred to as a contact chamber) of the contact cover whose opening is closed by the switch body portion. Usually, it is produced by housing a member.

The movable contact member is a flat conductive member that is installed at the distal end portion of the plunger shaft that protrudes outward from one end wall of the switch main body portion and linearly moves in the axial direction and extends in a substantially radial direction of the plunger shaft. The pair of fixed contact members are bolt-shaped conductive members each having a head portion accommodated in the recess while being spaced apart from each other by a predetermined distance in the radial direction of the plunger shaft, and penetrate the bottom portion of the contact cover in the axial direction. The heads of the pair of fixed contact members each have a fixed contact surface facing the movable contact surface of the movable contact member so as to be able to contact and separate. An example of the shape of a conventional fixed contact member is shown in FIG. 5, and the contact overlap shape is shown in FIG. 5 and 6, reference numeral 100 denotes a fixed contact member, 101 denotes a head thereof, 102 denotes a fixed contact surface, 103 denotes a movable contact member, and 104 denotes a movable contact surface. The movable contact surface 104 has a substantially rectangular shape, but the fixed contact surface 102 is formed in a circular shape. However, only the semicircular portion on the radially inner side of the circular fixed contact surface 102 is a contactable surface (hatched region) that can contact the movable contact surface.
JP 2003-184710 A

  As described above, in the conventional starter magnet switch, the contact surface of the movable contact member (also referred to as the movable contact surface) is in contact with the contact surface of the pair of fixed contact members (also referred to as the fixed contact surface). A contact contact form in which the fixed contact surface protrudes radially outward from the movable contact surface has been adopted.

  The reason for this is to ensure a space for the tip of the plunger shaft supporting the movable contact member to enter between the heads of the pair of fixed contact members when the movable contact member contacts the fixed contact member. There are a point that it is necessary to secure a radial interval between the pair of fixed contact members, and a point that the radial length of the movable contact member is desired to be shortened in order to ensure the rigidity and reduce the size and weight.

  As a result, there has been a usage pattern in which the movable contact surface of the movable contact member contacts only a part of the fixed contact surface of the fixed contact member.

  However, in the above usage pattern, when the wear of the fixed contact surface proceeds due to repeated use of the magnet switch, a step is generated between the worn portion and the non-wear portion on the fixed contact surface, and the movable contact member and the plunger shaft If the movable contact member is displaced in the radial direction due to the backlash between the two and the movable contact member, the movable contact surface may climb onto the non-wearing portion of the fixed contact surface, resulting in unstable contact and sparks. However, the contact wear tends to be accelerated and the contact life is shortened.

  In order to solve this problem, the movable contact surface may be extended in the radial direction or the fixed contact member may be moved inward in the radial direction. However, such a solution is difficult to adopt due to the reasons described above. There were drawbacks.

  The present invention has been made in view of the above problems, and provides a starter that can secure an interval between a pair of fixed contact members and can improve contact life without unnecessarily extending the movable contact member in the radial direction. The purpose of this is to provide a magnet switch.

In order to solve the above-described problems, the present invention provides a switch body portion in which a main member other than a contact member is accommodated, and a distal end portion of a plunger shaft that protrudes outward from one end wall of the switch body portion and linearly moves in an axial direction. A movable contact member installed on the plunger shaft and extending in a substantially radial direction of the plunger shaft, a contact cover having a recess for accommodating the movable contact member so as to be axially displaceable and fixed to the switch body, and A pair of rod-shaped fixed contact members each having a head accommodated in the recess while being spaced apart from each other by a predetermined distance in the radial direction of the plunger shaft and penetrating the contact cover in the axial direction, and the pair of fixed contact members The head portion of the movable contact member has a fixed contact surface facing the movable contact surface formed on the rear end surfaces of the upper end portion and the lower end portion of the movable contact member so as to be able to contact and separate, and a non-contact surface that can not contact the movable contact surface. Have each In the magnet switch for a starter,
The fixed contact surfaces, prior Symbol the front end surface of the convex portion to part of the head formed by projecting in the axial direction from the non-contact surface of the fixed contact member, the entire surface is formed to be contact with the movable contact surface In addition, the non-contact surface is characterized in that a recess formed at least in the axial direction from the non-contact surface is formed adjacent to the protrusion.

  In other words, in this invention, the portion of the head of the fixed contact member that does not contact the movable contact member is recessed in advance in the axial direction from the portion that contacts the movable contact member (referred to as a convex portion). Adopt structure. In this way, the fixed contact surface is almost entirely moved to the movable contact while ensuring the necessary distance between the pair of fixed contact members and avoiding an increase in the radial distance of the movable contact member. Because it can be contacted, the fixed contact surface is partially abraded and locally recessed, thereby preventing contact contact from becoming unstable and contact life from being shortened than expected. it can.

Further, according to the present invention, the head portion of the fixed contact member can have a wide surface (also referred to as a non-contact surface) adjacent to the convex portion and having no fixed contact surface. The non-contact surface is present at a position relatively closer to the outer end portion of the fixed contact member, that is, the outer end portion of the contact cover than the fixed contact surface of the convex portion. Therefore, when the outside air becomes low temperature and the moisture contained in the air in the recess, that is, the air in the contact chamber is supercooled and freezes or freezes, this freeze or freeze is caused by this non-contact surface of the head of the fixed contact member rather than the fixed contact surface. As a result, it is possible to reduce the amount of moisture condensation or icing on the fixed contact surface, and to improve the electrical conductivity between the movable contact surface and the fixed contact surface in a low temperature environment. Then, a surface that does not have a fixed contact surface adjacent to the convex portion (non-contact surface) is provided with a concave portion that is recessed at least from the non-contact surface in the axial direction, thereby condensing or freezing the fixed contact surface. It is possible to favorably reduce moisture adhesion.

  In a preferred aspect, the heads of the pair of fixed contact members are located between the heads of the pair of fixed contact members so that the distal end portion of the plunger shaft that protrudes toward the fixed contact member relative to the movable contact member is between the heads of the pair of fixed contact members. The pair of fixed contact members are arranged apart from each other by a distance that allows entry without contacting the heads.

  In this way, even when a mechanism for locking the movable contact member to the plunger shaft is provided at the distal end portion of the plunger shaft protruding from the movable contact surface of the movable contact member to the fixed contact member side, Since the member locking mechanism can be accommodated in the gap between the pair of fixed contact members in a state in which both contact surfaces are in contact, the movable contact surface and the fixed contact surface without complicating the movable contact member locking. Can be prevented from being abraded on the fixed contact surface.

  In a preferred aspect, the heads of the pair of fixed contact members are disposed across an extension line of the axis of the plunger shaft, and the center of the fixed contact surface is more than the center of the top surface of the head of the fixed contact member. Is also arranged so as to be biased toward the axial extension line side of the plunger shaft. As a result, the fixed contact surface and the movable contact surface can be disposed close to the axial center extension line of the plunger shaft, so that the movable contact member can be reduced in size, and when the movable contact member abuts the fixed contact member, the movable contact member is axially moved. Bending toward the anti-fixed contact member can also be reduced. In addition, since the movable contact member can be reduced in size and weight, the magnet switch can be reduced in attracting force, so that the switch body can be reduced in size and weight. Further, the seismic resistance of the plunger that holds the movable contact is improved by reducing the size and weight of the movable contact member. Furthermore, even when the movable contact is inclined with respect to the direction perpendicular to the axial extension line of the plunger shaft due to the backlash between the movable contact member and the plunger shaft due to the length of the movable contact being reduced in the longitudinal direction, Since the bias of the contact pressure load applied to each of the pair of fixed contact surfaces can be reduced and the unstable contact state can be reduced, uneven wear of the fixed contact surfaces can be suppressed.

  In a preferred aspect, the fixed contact surface has the plunger shaft in a direction perpendicular to the axial extension line of the plunger shaft with respect to the fixed contact shaft center which is a radial center line of a portion other than the head portion of the fixed contact member. Arranged on the side. As a result, the pair of fixed contact surfaces can be disposed close to each other while ensuring a sufficient radial distance between the pair of fixed contact members, so that the above-described various effects can be further improved.

  In a preferred aspect, the maximum distance from the axis of the plunger shaft to the movable contact surface outer diameter side is substantially equal to or slightly larger than the maximum distance from the plunger shaft axis extension line to the fixed contact surface outer diameter side. Only set larger. Thereby, since the extension of the movable contact surface in the useless radial direction can be prevented, the various effects described above can be further improved.

  In a preferred aspect, the fixed contact surface and the movable contact surface have a substantially rectangular shape having two sides substantially parallel to a direction connecting the pair of fixed contact members and two sides substantially perpendicular to the two sides. Have That is, according to this aspect, in the starter equipped with a movable contact member having a substantially rectangular movable contact surface having two sides substantially parallel to the radial direction of the plunger shaft center, a fixed contact surface having substantially the same shape is employed. The maximum distance to the outer side of the movable contact surface can be minimized without reducing the contact area, and the above-described effects can be further improved. Moreover, even when the movable contact is inclined with respect to the direction perpendicular to the axial extension line of the plunger shaft due to the backlash between the movable contact member and the plunger shaft due to the shortened length of the movable contact in the longitudinal direction, Since the bias of the contact pressure load applied to each of the pair of fixed contact surfaces can be reduced and the unstable contact state can be reduced, uneven wear of the fixed contact surfaces can be suppressed.

In a preferred aspect, the height of the convex portion is set to be larger by at least the maximum assumed wear amount than the contact spring deflection amount . That is, the movable contact surface is configured to be elastically retractable by a predetermined retraction amount in advance at the most projecting position of the plunger shaft by, for example, a contact spring so that the fixed contact surface can be contacted in a predetermined wear range of the contact surface. Has been. Therefore, the predetermined retraction amount is equal to the allowable advance amount from the axial distance (contact spring deflection possible amount) between the front end surface of the washer and the rear end surface of the bush when the movable contact is in contact with the convex portion. . In this aspect, since the height of the protrusion protrudes at least the maximum assumed wear amount from the allowable advance amount, the wear of the movable contact surface and the fixed contact surface is always within the wear range assumed in advance. The movable contact surface does not come into contact with the surface portion of the fixed contact member around the fixed contact surface of the convex portion, and the above-mentioned uneven wear can be prevented from occurring on the surface of the fixed contact member.

  In a preferred aspect, a portion of the head portion of the fixed contact member where the convex portion is not formed has an uneven shape. In this way, when the air in the contact chamber condenses or freezes at the low temperature of the outside air, the moisture in the air in the contact chamber makes good contact with the uneven surface having a large surface area outside the fixed contact surface. It is possible to more favorably reduce condensation or freezing moisture adhering to the fixed contact surface. In particular, since the concave portion is located at a position relatively closer to the outer end portion of the fixed contact member, that is, the outer end portion of the contact cover, than the other non-contact portion, condensation or icing moisture on the fixed contact surface. Can be more effectively reduced.

  In a preferred aspect, the portion of the fixed contact member other than the convex portion is different from the convex portion and has a thermal conductivity smaller than that of the convex portion. For example, the change of the thermal conductivity can be realized by changing the material. In this way, the temperature of the fixed contact surface can be rapidly reduced by rapidly cooling the cable fastened to the fixed contact member after the engine is stopped at a low outside temperature without increasing the voltage drop at the contact point. Since the moisture in the contact chamber can be relaxed, the moisture in the contact chamber can be condensed or frozen in the portion other than the exposed surface of the contact chamber of the fixed contact member, that is, the plunger shaft and the stationary core. That is, it is possible to alleviate concentrated condensation or icing on the contact chamber exposed surface of the fixed contact member, and it is possible to improve electrical conductivity when the contact is closed in a low temperature environment.

  A preferred embodiment of a starter magnet switch of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments, and it is a matter of course that the technical idea of the present invention can be configured by combining other known techniques or other techniques having the same functions as those of other known techniques.

(Example)
The starter magnet switch of this embodiment is a device that is integrally fixed to a starter (not shown) and controls the power supply to the starter motor intermittently and also drives a pinion drive lever. Except for the conventional lever-driven starter magnet switch, the essential structure and operation are the same.

(Description of overall configuration)
An axial sectional view of this starter magnet switch is shown in FIG.

  The starter magnet switch includes a switch main body 1 that is a composite device in which main members other than the contact members are accommodated, and a plunger shaft 2 that protrudes rearward from the rear end face of the switch main body 1 and moves linearly in the axial direction. A switch body portion having a movable contact member 3 set at the distal end and extending substantially in the radial direction of the plunger shaft 2 and a recess (also referred to as a contact chamber) 4 for accommodating the movable contact member 3 so as to be axially displaceable. A resin-made contact cover 5 that is fixed by caulking the packing 1 and a pair of bolt-shaped fixed contact members 6 and 7 that are fixed to the bottom of the contact cover 5 are provided as important components.

(Description of switch body 1)
The switch body 1 will be described. The switch body 1 has an exciting coil 8. The exciting coil 8 includes an attracting coil 8A and a holding coil 8B wound around the bobbin 9 in two layers. A magnetic circuit is formed for passing the magnetic flux generated by energizing the exciting coil 8 in linkage with the exciting coil 8.

  The magnetic circuit is a bottomed cylindrical yoke 11 that covers the outer periphery of the exciting coil 8, a stationary core 12 that is disposed in a direction that closes the opening of the yoke 11 at the rear end of the switch body 1, a so-called movable iron piece member. It is constituted by a certain plunger 13. The plunger 13 is inserted into the inner periphery of the bobbin 9 via a cylindrical sleeve so as to be slidable in the axial direction. Reference numeral 14 denotes a return spring that is disposed between the stationary core 12 and the plunger 13 and biases the plunger 13 forward.

  The plunger 13 has a recess opening forward, and a lever driving rod 15 and a lever spring 16 for urging the lever driving rod 15 rearward are accommodated in the recess. The base end of the lever spring 16 is locked to a collar 17 that is locked to the front end of the plunger 13 so as to surround the recess, and the biasing end of the lever spring 16 attaches the rear end of the lever driving rod 15 to the rear. It is fast.

  The plunger shaft 2 projects rearward from the plunger 13 along the plunger axis through the stationary core 12 and enters the contact chamber 4. A bush 18 is fitted to the tip of the plunger shaft 2 so as to be movable in the axial direction, and the movable contact member 3 is fitted to the bush 18 and extends in the radial direction. The movable contact member 3 is urged rearward by a contact spring 19. A washer 20 as a stopper member for restricting the backward movement of the movable contact member 3 (movement toward the distal end side of the plunger shaft 2) is fixed to the distal end of the plunger shaft 2 by a circlip.

(Description of operation)
The operation of the starter magnet switch described above will be described. When the exciting coil 8 is energized by inserting an IG key (not shown), the plunger 13 is retracted from the initial position shown in FIG. 1 while compressing the return spring 14, and the plunger shaft 2 and the movable contact member 3 are also retracted. The movable contact member 3 contacts the pair of fixed contact members 6 and 7. After the movable contact member 3 comes into contact with the fixed contact members 6 and 7, the plunger 13 further moves backward while pressing and contracting the contact spring 19, and comes into contact with the front end surface of the stationary core 12 to stop the backward movement of the plunger 13. The contact spring 19 applies a pressing force toward the fixed contact members 6 and 7 to the movable contact member 3. As a result, the magnet switch is closed and power is supplied from the battery to the starter motor.

  When the energization of the exciting coil 8 is turned off after the engine starts and the magnetic force disappears, the return spring 14 pushes the plunger 13 back to the original position. At this time, the movable contact member 3 is separated from the fixed contact members 6 and 7 and the magnet switch is cut off.

(Description of movable contact member 3)
The movable contact member 3 of this embodiment will be described with reference to FIG.

  The movable contact member 3 is composed of a substantially rectangular conductive flat plate member having a round hole through which the plunger shaft 2 passes in the center, and the long side thereof is arranged in the vertical direction shown in FIG. The rear end surfaces of the upper end portion and the lower end portion of the movable contact member 3 constitute a movable contact surface 30. Therefore, both movable contact surfaces 30 are squares having a height of approximately H and a width of approximately W, respectively.

(Description of fixed contact member)
The fixed contact members 6 and 7 constituting important components of the starter magnet switch of this embodiment will be described with reference to FIGS.

  As shown in FIG. 1, the fixed contact members 6 and 7 are individually fitted and inserted into a pair of fixed contact holes penetrating through the bottom of the resin contact cover 5, and the nuts 60 and 70 are used to contact the contact cover 5. It is fastened to the bottom. The head portions 61 and 71 of the bolt-shaped fixed contact members 6 and 7 are accommodated in the contact chamber 4 at positions spaced apart from the plunger axis by an equal distance with the plunger axis in the vertical direction. It is exposed at the bottom.

  On the heads 61 and 71 of the fixed contact members 6 and 7, convex portions 62 and 72 that substantially form fixed contacts project from the front end surfaces of the heads 61 and 71. The convex part 62 is arranged to be biased toward the plunger axis side of the head 61, and the convex part 72 is arranged to be biased toward the plunger axis side of the head 71. The shape of the head 71 of the fixed contact member 7 is shown enlarged in FIG. The protrusion 72 is offset from the axis of the fixed contact member 7 on the plunger axis side (upper side in FIG. 1). Similarly, the protrusion 62 is also on the plunger axis side of the axis of the fixed contact member 6. (Lower side in FIG. 1)

  FIG. 3A shows the shape of the head 71 in the plane perpendicular to the plunger axis, and FIG. 3B shows the side shape of the fixed contact member 7. A convex portion 72 is provided on the head 71 so as to protrude from the plunger axis, and a concave 73 is provided on the side away from the plunger axis. The shape of the head 61 is essentially the same except that the arrangement of the convex portion 62 and the concave portion 63 is reversed. As shown in FIG. 3, the convex portions 62 and 72 are squares each having a height of approximately h and a width of approximately w, where h is slightly smaller than H and w is slightly smaller than W. . As a result, the entire fixed contact surface (the fixed contact surface 74 is shown in FIG. 3) that is the front end surface of the convex portions 62 and 72 can abut on the movable contact surface 30 of the movable contact member 3. As shown in FIG. 1, the initial height of the convex portions 62 and 72 is an axis between the front end surface of the washer 20 and the rear end surface of the bush 18 when the movable contact 3 is in contact with the convex portions 62 and 72. It is set to be at least a predetermined amount larger than the directional distance (contact spring deflection amount). As a result, the movable contact member 3 always has a predetermined maximum wear amount (that is, an amount obtained by subtracting the height of the convex portions 62 and 72 at the end of use from the initial height of the convex portions 62 and 72). The movable contact surface 30 abuts only on the fixed contact surfaces of the convex portions 62 and 72 as fixed contacts, and the non-wearing portions around the convex portions 62 and 72 of the head portions 61 and 71 of the fixed contact members 6 and 7 (see FIG. 3). ).

(Example effect)
The effect of the starter magnet switch of this embodiment is as described above. The important point is that in this embodiment, the convex portions 62 and 72 of the fixed contact members 6 and 7 are offset from the plunger axis, so that the vertical dimension of the movable contact member 3 can be shortened, and a pair of fixed contacts The fixed contact surfaces of the fixed contact members 6 and 7 and the movable contact surface of the movable contact member 3 can be brought into almost full contact while securing the distance between the axial centers of the members 6 and 7 to a predetermined dimension or more (see FIG. 4). Thereby, it is possible to prevent the washer 20 and the like provided behind the movable contact member 3, that is, at the tip of the plunger shaft 2 from coming into contact with the fixed contact members 6 and 7.

  In this embodiment, since the fixed contact surfaces of the convex portions 62 and 72 of the fixed contact members 6 and 7 and the movable contact surface of the movable contact member 3 are both formed in a rectangular shape, the minimum contact contact area is required. In addition, the length of the movable contact in the longitudinal direction can be efficiently shortened. In addition, since the length of the movable contact in the longitudinal direction is shortened, even when the movable contact is tilted with respect to the direction perpendicular to the axial extension line of the plunger shaft due to the backlash between the movable contact member and the plunger shaft, Since the unevenness of the contact pressure load applied to each of the fixed contact surfaces can be reduced and the unstable contact state can be reduced, uneven wear of the fixed contact surfaces can be suppressed. Further, in this embodiment, since the concave portions 63 and 73 are provided adjacent to the convex portions 62 and 72 on the head portions 61 and 71 of the fixed contact members 6 and 7, condensation or freezing moisture adheres to the fixed contact surface. Can be reduced satisfactorily. Note that the concave portions 63 and 73 may have complicated concave and convex shapes that further increase the surface area.

(Modification)
In the above embodiment, the fixed contact members 6 and 7 including the convex portions 62 and 72 and the head portions 61 and 71 are made of the same conductive material, but the fixed contact members 6 and 7 other than the convex portions 62 and 72 It is also possible to change the material to make the thermal conductivity smaller than the thermal conductivity of the convex portions 62 and 72. Thereby, the temperature decrease of the non-wearing part of the head parts 61 and 71 and the convex parts 62 and 72 can be relatively slowed when the outside air is rapidly cooled, and the condensation or freezing of moisture on the fixed contact surface is relatively reduced. be able to.

It is sectional drawing of the axial direction of the magnet switch for starters of an Example. (A) is a front view of the movable contact member of FIG. 1, (b) is the side view. (A) is the front view seen from the head side of the fixed contact member of FIG. 1, (b) is the side view. It is a model front view which shows the state which contacted the movable contact member and the fixed contact member. (A) is the front view seen from the head side of the conventional fixed contact member, (b) is the side view. It is a schematic front view which shows the state which contacted the movable contact member and fixed contact member in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Switch main-body part 2 Plunger axis | shaft 3 Movable contact member 4 Contact chamber 5 Contact cover 6 Fixed contact member 7 Fixed contact member 8 Excitation coil 8A Attraction coil 8B Holding coil 9 Bobbin 11 York 12 Stationary core 13 Plunger 14 Return spring 15 For lever drive Rod 16 Lever spring 17 Collar 18 Bush 19 Contact spring 20 Washer 30 Movable contact surface 60 Nut 61 Head 62 Convex 63 Concave 71 Head 72 Convex 73 Concave 74 Fixed contact surface

Claims (9)

A switch main body portion in which main members other than the contact member are accommodated, and a distal end portion of a plunger shaft that protrudes outward from one end wall of the switch main body portion and linearly moves in the axial direction, and substantially in the radial direction of the plunger shaft An extending movable contact member, a contact cover having a recess that accommodates the movable contact member so as to be axially displaceable, and fixed to the switch main body, while being spaced apart from each other by a predetermined distance in the radial direction of the plunger shaft A pair of rod-shaped fixed contact members each having a head housed in a recess and penetrating the contact cover in the axial direction;
The heads of the pair of fixed contact members can not contact the movable contact surface, and the fixed contact surface facing the movable contact surface formed on the rear end surface of the upper end portion and the lower end portion of the movable contact member. In a starter magnet switch each having a non-contact surface ,
The fixed contact surfaces, prior SL on the front end surface of the convex portion to part of the head formed by projecting in the axial direction from the non-contact surface of the fixed contact member, the entire surface is formed to be contact with the movable contact surface In addition, the non-contact surface is formed with a recess formed in the axial direction at least from the non-contact surface adjacent to the protrusion.
A magnet switch for starters. The starter magnet switch according to claim 1,
The heads of the pair of fixed contact members are located between the heads of the pair of fixed contact members, and the distal ends of the plunger shafts that protrude toward the fixed contact member relative to the movable contact member. Magnet switch for starter, characterized in that it is arranged at a distance that can be entered without touching the head. The starter magnet switch according to claim 1 or 2,
The heads of the pair of fixed contact members are arranged across an extension line of the axis of the plunger shaft,
The starter magnet switch is characterized in that the center of the fixed contact surface is offset from the center of the top surface of the head of the fixed contact member toward the axis extension line side of the plunger shaft. The starter magnet switch according to claim 3,
The fixed contact surface is disposed on the plunger shaft side in a direction perpendicular to the axial extension line of the plunger shaft with respect to the fixed contact shaft center which is a radial center line of a portion other than the head portion of the fixed contact member. Magnetic switch for starter, characterized by The starter magnet switch according to any one of claims 2 to 4,
The maximum distance from the axis of the plunger shaft to the movable contact surface outer diameter side is set to be approximately equal to or slightly larger than the maximum distance from the axis extension line of the plunger shaft to the fixed contact surface outer diameter side. A magnet switch for starters. The starter magnet switch according to any one of claims 2 to 5,
The fixed contact surface and the movable contact surface have a substantially rectangular shape having two sides substantially parallel to a direction connecting the pair of fixed contact members and two sides substantially perpendicular to the two sides. Magnet switch for starter. The starter magnet switch according to any one of claims 1 to 6,
The starter magnet switch is characterized in that the height of the convex portion is set to be at least the maximum assumed wear amount than the contact spring deflection amount . The starter magnet switch according to any one of claims 1 to 7,
The starter magnet switch according to claim 1, wherein a portion of the head of the fixed contact member where the convex portion is not formed has an uneven shape. The starter magnet switch according to any one of claims 1 to 8,
A portion of the fixed contact member other than the convex portion is different from the convex portion and has a thermal conductivity smaller than that of the convex portion.

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