JP2006170099A - Magnet switch for starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnet switch for a starter including a seal ring facilitating assembly work without dropping assemblability and sealing performance, and facilitating automating. <P>SOLUTION: A seal ring 100 gripped between a front end surface of a contact cover 5 and a stationary core 12 is provided with a thick outer ring part which is a part strongly compressed in an axial direction between the contact cover 5 and the stationary core 12, and a thin inner extension part extending in a radial direction inward from the outer ring part and put between the contact cover 5 and the stationary core 12 with rarely compressed in an axial direction. The outer ring part 101 and an inner end surface part 52 are connected to form the seal ring 100 in a sheet shape. Consequently, work efficiency is improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement in a starter magnet switch.

  As a starter magnet switch, a switch main body having a stationary core as a magnetic path member extending in the radial direction, a movable contact member driven by the switch main body, and a fixed contact member that can be contacted and separated from the movable contact member Between the one end face of the stationary core side of the contact cover and the outer end face of the stationary core. A structure including a rubber seal ring is described in, for example, Patent Document 1 below.

In this starter magnet switch, the seal ring has a certain thickness and is formed in the shape shown in FIGS. 5 and 6, and the contact cover is fixed by caulking to the open end of the switch body. 5 and 6, 200 is a seal ring, 201 is a hole for securing a contact chamber opening of the contact cover and through which a stationary core abutting protrusion of the contact cover passes, 202 and 203 are This is a hole for passing through the coil lead wire.
Japanese Patent No. 3152248

  However, when assembling a starter magnet switch using a conventional starter magnet switch seal ring such as the above-described seal ring described in Patent Document 1, a movable contact member is provided in the contact chamber at the center of the seal ring. Since it has a large opening to accommodate, the seal ring is greatly deformed from the shape suitable for assembly during assembly, making it difficult to work in both manual and automatic assembly processes, leaving room for improvement in assembly there were.

  In order to improve this, it is conceivable to increase the rigidity of the seal ring by increasing the thickness of the seal ring. In this case, however, the force that presses the contact cover against the switch body when the contact cover is crimped to the switch body. (Caulking load) becomes large, the work is difficult to perform, and the seal ring after caulking is not sufficiently elastically deformed, and there is a concern that the sealing performance may be lowered.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a starter magnet switch having a seal ring that can facilitate the assembly operation without deteriorating the assembling property and the sealing property.

A magnet switch for a starter according to a first aspect of the present invention that solves the above problems includes a switch body having a stationary core as a magnetic path member extending in the radial direction, a movable contact member driven by the switch body, and the movable contact A contact cover that has a recess for receiving a fixed contact member that can be contacted and separated from the member and is locked to the switch body, an end surface of the contact cover on the stationary core side, and an outer end surface of the stationary core. In a starter magnet switch comprising a seal ring sandwiched between
One end surface of the contact cover includes a ring-shaped outer end surface portion that presses against the outer end surface of the stationary core while at least surrounding the recess while compressing the seal ring in the thickness direction, and the seal ring An inner end surface portion extending radially inward from the outer peripheral portion without being compressed in the thickness direction;
The seal ring includes a thick outer ring portion sandwiched between an outer end surface portion of the contact cover and an outer end surface of the stationary core, and an inner side of the contact cover extending radially inward from the outer ring portion. It has a thin-walled inner extending portion interposed between the end surface portion and the outer end surface of the stationary core.

  That is, the present invention provides an outer ring portion which is a portion of the seal ring which is sandwiched between the outer end surface portion of the contact cover and the outer end surface of the stationary core and is compressed in the axial direction in order to complete the seal. In addition, a thin inner extension portion extending radially inward from the outer ring portion is additionally formed, and the inner extension portion is interposed between the inner end surface portion of the contact cover and the outer end surface of the stationary core. The feature is the point.

  The outer end surface portion of the contact cover referred to above means a portion of the end surface on the stationary core side of the contact cover that compresses the outer ring portion of the seal ring in the axial direction for internal sealing. To do. One end surface of the contact cover extends from the outer end surface portion to the radially inner side of the outer end surface portion in addition to the outer end surface portion.

  In this way, the inner extension part of the seal ring is interposed between the inner end surface part of the contact cover and the outer end face of the stationary core, but is thinner than the outer ring part. There is no need to compress in the axial direction as strongly as the outer ring portion. Therefore, in assembling, it is not necessary to press the contact cover more strongly than the conventional case during caulking, and workability is not deteriorated. Further, according to the present invention, the inner extending portion extends radially inward of the outer ring portion of the seal ring formed in a ring shape, thereby substantially giving the entire seal ring a sheet-like shape. Therefore, since the seal ring can be maintained in a predetermined shape at the time of assembling, the assembling work of the seal ring becomes easy and excellent workability can be obtained. In addition, since the seal ring can be reliably assembled while maintaining a predetermined shape, the seal ring is compressed in a desired shape, and the sealing performance does not deteriorate. Furthermore, the caulking force when the contact cover is fixed to the switch body by caulking can be reduced.

  Since the inner end surface of the contact cover extends radially inward from the outer end surface of the contact cover, it is possible to reduce the useless space inside the seal ring and to easily position the seal ring at the target position during assembly. It is also necessary to guide to set.

  In a preferred aspect, the radially inner end of the outer ring portion of the seal ring has a plurality of radially inwardly curved portions bent radially inward, and the inner mold extending portion of the seal ring has a circumferential It is formed by connecting a pair of curved portions adjacent to each other in the direction. In this way, the inner extending portion of the seal ring forms a flat surface integrally with the curved portion bent radially inward of the outer ring portion of the seal ring. The seal ring can be kept in the desired shape.

  In a preferred aspect, the inner extending portion of the seal ring is disposed so as to surround the concave portion along the entire circumference of the seal ring together with the curved portion. In this way, the shape of the seal ring can be made into a sheet shape, so that undesirable deformation can be further suppressed.

  In a preferred aspect, the inner extending portion of the seal ring is recessed on both sides than the outer ring portion of the seal ring. In this way, since the seal ring can be assembled without worrying about the back and front of the seal ring, the assembling work can be further improved. In addition, it is suitable that the amount of depressions is the same on both sides.

  In a preferred aspect, the outer ring portion includes a coil terminal lead hole through which a coil lead wire for feeding power to the excitation coil of the switch body portion extends in the axial direction at the position of the radially inwardly curved portion, and A positioning hole is formed so as to surround a part of one end surface of the contact cover on the end surface of the switch main body without passing through the seal ring. In this case, the inner extension of the seal ring can be omitted at the coil terminal lead hole and the positioning hole, and the sheet shape can be formed together with the outer ring part and the curved part surrounding these holes. , Can save material.

  A second invention that solves the above-described problem is a switch body having a stationary core as a magnetic path member extending in a radial direction, a movable contact member driven by the switch body, and a movable contact member that can be contacted and separated from the movable contact member A contact cover that has a recess for receiving a fixed contact member and is locked to the switch body, and is sandwiched between one end surface of the contact cover on the stationary core side and the outer end surface of the stationary core. In the starter magnet switch including the seal ring, the one end surface of the contact cover is pressed against the outer end surface of the stationary core while at least surrounding the recess while compressing the seal ring in the thickness direction. A ring-shaped outer end surface portion and the seal ring extending radially inward from the outer peripheral portion without being compressed in the thickness direction. An inner end surface portion that is formed to be recessed radially inward of the outer end surface portion, and the seal ring is between the outer end surface portion of the contact cover and the outer end surface of the stationary core. In addition, the contact cover is also sandwiched between the inner end surface portion of the contact cover and the outer end surface of the stationary core. In the present invention, it is important that the inner extending portion of the seal ring extends radially inward from the outer ring portion of the seal ring over the entire circumference of the outer ring portion of the seal ring. Thereby, since a sheet | seat shape can be given substantially to a seal ring, assembly workability | operativity can be improved.

  That is, in the present invention, the inner end surface portion of the contact cover is slightly recessed from the outer end surface portion instead of making the inner extension portion of the seal ring of the first invention thinner than the outer ring portion. Therefore, the shape stability during the assembly work of the seal ring can be improved without increasing the axial compression force of the seal ring.

  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 is fixed to the switch body 1 and the distal end of a plunger shaft 2 that protrudes rearward from the rear end surface of the switch body 1 and moves linearly in the axial direction. A resin-made member that has a movable contact member 3 that extends and a recess (also referred to as a contact chamber) 4 that accommodates the movable contact member 3 so as to be axially displaceable, and is fixed by crimping the seal ring 100 to the switch body 1. And a pair of bolt-shaped fixed contact members 6 and 7 fixed to the bottom of the contact cover 5.

(Description of switch body 1)
The switch main body 1 is generated by energizing the excitation coil in linkage with the excitation coil and the excitation coil composed of a suction coil (not shown) wound around the bobbin 9 and a holding coil (not shown). And a magnetic circuit for passing the magnetic flux.

  The magnetic circuit includes a bottomed cylindrical yoke 11 that covers the outer periphery of the exciting coil, a stationary core 12, a substationary core 12 a that is disposed in a direction that closes the opening of the yoke 11 at the rear end of the switch body 1, a movable It has a plunger (not shown) having a plunger shaft 2 that is an iron piece member. The plunger is supported on the inner periphery of the bobbin 9 by a cylindrical sleeve so as to be slidable in the axial direction. Reference numeral 14 denotes a return spring that is arranged between the substationary core 12a and the plunger and biases the plunger forward.

  The plunger shaft 2 protrudes rearward from the plunger along the plunger axis through the stationary core 12 and is disposed in the contact chamber 4. A bush 18 is provided at 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 serving 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 30.

(Description of seal ring 100)
The seal ring 100 that characterizes this embodiment will be described below.

  In FIG. 1, the seal ring 100 is fitted into the rear end opening of the yoke 11, and the contact cover 5 is further fitted into the rear end opening of the yoke 11, and the outer periphery of the rear end of the yoke 11 is caulked while pressing the contact cover 5. The contact cover 5 is fixed to a yoke 11 that also serves as a switch case. The seal ring 100 is made of rubber and is sandwiched between the rear end surface of the stationary core 12 and the front end surface of the contact cover 5 to seal the contact chamber 4.

  The contact cover 5 and the seal ring 100 will be described in detail with reference to FIGS. 2 is a front view showing the front end face of the contact cover 5, FIG. 3 is a front view of the seal ring 100, and FIG. 4 is a side sectional view of the seal ring 100 taken along the line AA.

  The front end face 50 of the contact cover 5 is provided with a recess for forming the contact chamber 4 in the central portion in the radial direction, and terminal holes 51 and 52 to which a pair of coils are connected across the contact chamber 4 in the radially outer peripheral portion. Is formed. A total of seven protrusions 53 to 59 are formed for contact with the stationary core 12. The front end surface 50 of the contact cover 5 has outer end surface portions 60 and 61 which are regions for compressing the seal ring 100 in the axial direction, and an inner side which hardly compresses the seal ring 100 in the axial direction despite being adjacent to the seal ring 100. It is divided into an end face part 58. The outer end surface portion 57 of the contact cover 5 is formed in a ring shape on the outer peripheral portion of the contact cover 5 so as to surround the contact chamber 4 and swells radially inward to surround the terminal holes 51 and 52. The inner end surface portion 62 of the contact cover 5 is formed inside the ring-shaped outer end surface portion 60, around the terminal holes 51 and 52, and at portions other than the protrusions 53 to 59.

  The seal ring 100 includes a thick ring-shaped outer ring portion 101 sandwiched between the outer end surface portions 60 and 61 of the contact cover 5 and the rear end surface (outer end surface) of the stationary core 12, and a radial direction from the outer ring portion 101. From the thin inner extension portion 102 that extends inward and is interposed between the inner peripheral inner end face portion 62 of the front end face of the contact cover 5 and the rear end face (outer end face) of the stationary core 12. Become. As shown in FIG. 4, the inner extending portion 102 of the seal ring 100 is formed so as to be recessed from both sides in the axial direction than the outer ring portion 101 of the seal ring 100.

  That is, the outer end surface portions 60 and 61 of the contact cover 5 are portions of one end surface of the contact cover 5 on the stationary core 12 side that compresses the outer ring portion 101 of the seal ring 100 in the axial direction for internal sealing. The inner end surface portion 62 of the contact cover 5 is an outer ring portion of the seal ring 100 for sealing the contact chamber 4 and the coil lead wire holes 51 and 52 on one end surface of the contact cover 5 on the stationary core 12 side. 101 refers to a portion facing the inner extending portion 102 of the seal ring 100 without being compressed in the axial direction.

  As can be seen from FIG. 3, the inner extension 102 is substantially divided into two parts, and these two parts of the inner extension 102 have a diameter to surround the periphery of the terminal holes 51, 52. A pair of outer ring portions 101 of the seal ring 100 bulging inward in the direction are individually connected. Further, the seal ring 100 has holes 103 to 106 through which the four protrusions 53 to 56 of the contact cover 5 pass.

  The four protrusions 53 to 56 of the contact cover 5 individually pass through the holes 103 to 106 of the seal ring 100 and come into contact with the rear end surface of the stationary core 12, and the protrusions 57 to 59 correspond to the seal ring 100. The movable contact member 3 is positioned through the contact chamber hole. The positioning holes 103 to 106 are surrounded by the outer ring portion 101 and the inner extension portion 102.

(Description of operation)
The operation of the starter magnet switch described above will be described. When the exciting coil is energized by inserting an IG key (not shown), the plunger is attracted and retracted while pushing the return spring 14 from the initial position shown in FIG. 1, and the plunger shaft 2 and the movable contact member 3 are also retracted to move. The 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 further retracts while pressing and contracting the contact spring 19, and comes into contact with the front end surface of the substationary core 12a to stop the retreat of the plunger. 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 to the exciting coil is turned off after the engine starts and the magnetic force disappears, the return spring 14 pushes the plunger 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.

(Example effect)
In this way, the inner extension portion 102 of the seal ring 100 is interposed between the inner end surface portion 58 of the contact cover 5 and the rear end surface of the stationary core 12, but is thicker than the outer ring portion 101. Therefore, it is not necessary to compress in the axial direction as strongly as the outer ring portion 101 during assembly. Accordingly, it is possible to reduce the force of pressing the contact cover 5 against the switch body 1 without deteriorating the sealing performance during caulking in assembly. Since the inner extending portion 102 of the seal ring 100 is formed into a packing sheet shape as a whole by connecting two portions swelled radially inward of the outer ring portion 101, the seal ring 100 is desirable for handling during assembly. It is possible to satisfactorily prevent deformation to a shape that is not present. Thereby, the assembly work of the seal ring 100 becomes easy, and excellent workability can be obtained.

  Further, since the assembly of the seal ring 100 can be ensured while maintaining a predetermined shape, the seal ring 100 is not compressed into an undesired shape and the sealing performance is not deteriorated.

  Further, the inner mold extending portion 102 of the seal ring 100 is formed so as to connect the portions of the outer ring portion 101 swelled radially inward as a radially inwardly curved portion. The shape of the seal ring 100 can be made close to a sheet shape by the existing portion 102, and the above-described effects can be further improved.

  Further, the inner extending portion 102 of the seal ring 100 is disposed so as to surround the entire circumference of the seal ring 100 together with a portion of the outer ring portion 101 bulging radially inward as a radially inwardly curved portion. The shape of 100 can be made into a sheet shape, and the shape deformation can be suppressed satisfactorily.

  In addition, since both the inner extension portions 102 of the seal ring 100 are recessed from the outer ring portion 101 of the seal ring 100, the seal ring can be assembled without worrying about the back and front of the seal ring 100. Can do.

  Also, the portion of the outer ring portion 101 that swells inward in the diameter. Since the holes are formed so as to surround the various holes of the setten cover 5, it is possible to secure the seals of these holes and to save the inner extending part 102.

(Modification)
In the above embodiment, the inner extension 102 of the seal ring 100 is axially reduced in order to reduce the axial pressing force of the contact cover 5 when the contact cover 5 is pressed against the stationary core 12 and the vicinity of the opening of the yoke 11 is caulked. However, instead of the front end surface of the contact cover 5, the portion that contacts the outer ring portion 101 of the seal ring 100 and the portion other than the protrusions 53 to 56, that is, the inner end surface portion 58 of the contact cover 5. The same effect can be obtained even when the above-described seal ring 100 is depressed by the amount of depression in the axial direction of the inner extending portion 102 from the outer ring portion 101 of the seal ring 100.

It is a partially broken side view of the starter magnet switch of the embodiment. It is a front view of the contact cover of FIG. It is a front view of the seal ring of FIG. It is a sectional side view of the seal ring of FIG. It is a front view of the conventional seal ring. It is a sectional side view of the conventional seal ring.

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 9 Bobbin 11 Yoke 12 Stationary core 12a Substationary core 14 Return spring 18 Bush 19 Contact spring 20 Washer 50 Front end surface 53-56 Projection 57 Outer end surface portion 58 Inner end surface portion 100 Seal ring 101 Outer ring portion 102 Inner extending portions 103 to 106 Positioning hole

Claims (6)

A switch main body having a stationary core as a magnetic path member extending in the radial direction, a movable contact member driven by the switch main body, and a recess for accommodating a fixed contact member that can be contacted and separated from the movable contact member And a contact cover that is locked to the switch body, and a seal ring that is sandwiched between one end surface of the contact cover on the stationary core side and the outer end surface of the stationary core. In the switch
One end surface of the contact cover is
A ring-shaped outer end surface portion that presses against the outer end surface of the stationary core surrounding at least the recess while compressing the seal ring in the thickness direction;
An inner end face portion extending radially inward from the outer peripheral portion without compressing the seal ring in the thickness direction;
Have
The seal ring is
A thick outer ring portion sandwiched between the outer end surface portion of the contact cover and the outer end surface of the stationary core;
A thin-walled inner extending portion that extends radially inward from the outer ring portion and is interposed between the inner end surface portion of the contact cover and the outer end surface of the stationary core,
A starter magnet switch characterized by comprising: The starter magnet switch according to claim 1,
The radially inner end of the outer ring portion of the seal ring has a plurality of radially inwardly curved portions bent inward in the radial direction,
The starter magnet switch according to claim 1, wherein the inner extending portion of the seal ring is formed by connecting a pair of curved portions adjacent in the circumferential direction. The starter magnet switch according to claim 2,
The starter magnet switch is characterized in that the inner extending portion of the seal ring is disposed so as to surround the concave portion along the entire circumference of the seal ring together with the curved portion. The starter magnet switch according to any one of claims 1 to 3,
The starter magnet switch according to claim 1, wherein both inner surfaces of the seal ring are recessed from the outer ring portion of the seal ring. The starter magnet switch according to any one of claims 1 to 4,
The outer ring portion is
A coil terminal lead hole through which a coil lead wire for feeding power to the exciting coil of the switch body portion extends in the axial direction at the position of the radially inwardly curved portion, and one end of the contact cover on the end surface of the switch body portion. A starter magnet switch, characterized in that the starter magnet switch is formed so as to surround a positioning hole for allowing a part of an end face to abut without passing through the seal ring. A switch main body having a stationary core as a magnetic path member extending in the radial direction, a movable contact member driven by the switch main body, and a recess for accommodating a fixed contact member that can be contacted and separated from the movable contact member And a contact cover that is locked to the switch body, and a seal ring that is sandwiched between one end surface of the contact cover on the stationary core side and the outer end surface of the stationary core. In the switch
One end surface of the contact cover is
A ring-shaped outer end surface portion that presses against the outer end surface of the stationary core surrounding at least the recess while compressing the seal ring in the thickness direction;
An inner end surface portion that extends radially inward from the outer peripheral portion without compressing the seal ring in the thickness direction and is recessed in a radially inner side than the outer end surface portion; and
Have
The seal ring is
In addition to being between the outer end surface portion of the contact cover and the outer end surface of the stationary core, it is also sandwiched between the inner end surface portion of the contact cover and the outer end surface of the stationary core. Magnet switch for starter.

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