JP2008097893A - Electromagnetic switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce assembly fraction defective due to the wrong assembly of a fixed core 3 and a movable core 4 in an electromagnetic switch 1. <P>SOLUTION: The fixed core 3 and the movable core 4 are identical, exchangeable objects having the same shape and dimensions in the electromagnetic switch 1, and the axial pluctuation of a rod 9 is regulated by a movable contact 7. By setting the fixed core 3 and the movable core 4 to be identical objects, the risk of erroneously assembling the fixed core 3 and the movable core 4 is eliminated, thus greatly reducing assembly fraction defective. Also, since the axial pluctuation of the rod 9 is regulated by the movable contact 7, the movable contact 7 can be smoothly displaced axially in linking with the movable core 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetic switch for opening and closing an electric circuit.

  Conventionally, the electromagnetic switch is fixedly disposed on one side in the axial direction of the inner periphery of the solenoid coil, and is disposed on the other side in the axial direction from the fixed core on the inner periphery of the solenoid coil. A movable iron core that is magnetically attracted to one side in the axial direction by energization, a return spring that urges the movable core toward the other side in the axial direction, and a predetermined electric circuit that is fixed to the other side in the axial direction of the movable core. Fixed contact, a movable contact that is disposed on the other side of the fixed contact in the axial direction, opens and closes the electric circuit by being separated from the fixed contact, a contact pressure spring that biases the movable contact in the one axial direction, and movable A rod disposed between the iron core and the movable contact and transmitting a biasing force of a return spring acting on the movable iron core to the movable contact to bias the movable contact toward the other side in the axial direction;

  In the electromagnetic switch, when the solenoid coil is energized, the movable iron core is displaced to one side in the axial direction, and the movable contact is biased by the contact pressure spring to be displaced to one side in the axial direction. When the electric circuit is closed by contact and the energization to the solenoid coil is stopped, the movable iron core is urged by the return spring and displaced to the other side in the axial direction, and the movable contact is urged by the rod to Displaces to the other side in the direction and leaves the fixed contact to open the electrical circuit.

By the way, according to the conventional electromagnetic switch, the rod is fitted into a hole provided in the other end surface of the movable iron core, and the vicinity of the hole is caulked toward the rod and fixed (for example, Patent Document 1). reference). That is, the movable iron core and the fixed iron core are separate members depending on whether or not there is a hole for fitting the rod, although the radial and axial dimensions can be made the same. For this reason, there exists a possibility that a movable iron core and a fixed iron core may be misassembled, and reduction of an assembly defect rate has been a subject.
JP 2006-185816 A

  The present invention has been made to solve the above-described problems, and is to reduce an assembly failure rate due to erroneous assembly of a movable iron core and a fixed iron core in an electromagnetic switch.

[Means of Claim 1]
The electromagnetic switch according to claim 1 is provided with a fixed iron core that is fixedly arranged on one side in the axial direction of the inner periphery of the solenoid coil, and is arranged on the other inner side of the solenoid coil in the axial direction than the fixed iron core. A movable iron core that is magnetically attracted to one side in the axial direction by energizing the coil, a return spring that urges the movable core toward the other side in the axial direction, and a fixed electric circuit connected to the other side in the axial direction of the movable core Fixed contact, a movable contact that is arranged on the other side of the fixed contact in the axial direction, opens and closes the electric circuit by being separated from the fixed contact, and a contact pressure spring that biases the movable contact toward the one side in the axial direction And a rod that is disposed between the movable iron core and the movable contact, transmits a biasing force of a return spring acting on the movable iron core to the movable contact, and biases the movable contact toward the other side in the axial direction.

When the solenoid coil is energized, the movable iron core is displaced to one side in the axial direction, and the movable contact is urged by the contact pressure spring to be displaced to one side in the axial direction, and comes into contact with the fixed contact to make an electric circuit. Is closed. When energization of the solenoid coil is stopped, the movable iron core is urged by the return spring and displaced in the other axial direction, and the movable contact is urged by the rod and displaced in the other axial direction. The electrical circuit is opened by separating from the contact.
According to this electromagnetic switch, the fixed iron core and the movable iron core are the same shape and the same size and can be interchanged, and the shaft of the rod is regulated by the movable contact.

  By making the fixed iron core and the movable iron core the same thing, there is no possibility of misassembling the movable iron core and the fixed iron core, so that the assembly failure rate can be greatly reduced. On the other hand, since there is no hole for fitting the rod to the movable iron core, and the rod cannot be fixed by the movable iron core, the shaft deflection of the rod is regulated by the movable contact instead of the movable iron core. As a result, even if the fixed iron core and the movable iron core are the same and the rod is not fixed by the movable iron core, the movable contact can be smoothly displaced in the axial direction in conjunction with the movable iron core.

[Means of claim 2]
According to the electromagnetic switch of the second aspect, the other end of the rod is provided in a step shape, the movable contact is provided with a hole, and the rod is movable by loosely fitting the other end of the rod into the hole. The shaft runout is regulated by the movable contact by engaging with the contact.
Thereby, while the movable contact regulates the axial deflection of the rod, the rod can reliably support the movable contact from the one side in the axial direction by the other end of the step shape. Therefore, the movable contact can be stably displaced in the axial direction against the urging force of the contact pressure spring.

[Means of claim 3]
According to the electromagnetic switch of the third aspect, the movable contact is caulked toward the inner peripheral side and is fixed to the rod.
Thereby, since the rod is more strongly restrained by the movable contact, it is possible to more strongly restrict the axial touch of the rod.

[Means of claim 4]
According to the electromagnetic switch of the fourth aspect, the rod is made of a thermoplastic resin, and the other end of the rod penetrates the hole and projects to the other side in the axial direction of the movable contact. The movable contact is fixed to the rod by the end being heat caulked.
Thereby, the same effect as that of the means of claim 3 can be obtained.

[Means of claim 5]
According to the electromagnetic switch of the fifth aspect, the rod is provided with a thermoplastic resin as a raw material, and the movable contact and the rod are integrated by insert molding.
Thereby, the same effect as that of the means of claim 3 can be obtained.

  The electromagnetic switch of the best mode 1 includes a fixed iron core fixed on one side in the axial direction of the inner circumference of the solenoid coil, and an inner circumference of the solenoid coil arranged on the other side in the axial direction than the fixed iron core. A movable iron core that is magnetically attracted to one side in the axial direction by energizing the coil, a return spring that urges the movable core toward the other side in the axial direction, and a predetermined electric circuit that is fixed to the other side in the axial direction of the movable core. A fixed contact arranged on the other side in the axial direction of the fixed contact, a movable contact that opens and closes the electric circuit by being separated from and contacting the fixed contact, and a contact pressure spring that biases the movable contact in one axial direction And a rod that is arranged between the movable iron core and the movable contact, transmits a biasing force of a return spring acting on the movable iron core to the movable contact, and biases the movable contact toward the other side in the axial direction.

When the solenoid coil is energized, the movable iron core is displaced to one side in the axial direction, and the movable contact is urged by the contact pressure spring to be displaced to one side in the axial direction, and comes into contact with the fixed contact to make an electric circuit. Is closed. When energization of the solenoid coil is stopped, the movable iron core is urged by the return spring and displaced in the other axial direction, and the movable contact is urged by the rod and displaced in the other axial direction. The electrical circuit is opened by separating from the contact.
According to this electromagnetic switch, the fixed iron core and the movable iron core are the same shape and the same size and can be interchanged, and the shaft of the rod is regulated by the movable contact.

  Further, according to this electromagnetic switch, the other end of the rod is provided in a step shape, and a hole is provided in the movable contact, and the rod is loosely fitted in the hole and the other end of the rod is loosely engaged with the movable contact. As a result, the shaft runout is regulated by the movable contact.

According to the electromagnetic switch of the best mode 2, the movable contact is caulked toward the inner peripheral side and is fixed to the rod.
According to the electromagnetic switch of the best mode 3, the rod is provided with a thermoplastic resin as a material, and the other end of the rod passes through the hole and protrudes to the other side in the axial direction of the movable contact, and the other end of the protruded rod The movable contact is fixed to the rod by heat caulking.
According to the electromagnetic switch of the best mode 4, the rod is provided with a thermoplastic resin as a material, and the movable contact and the rod are integrated by insert molding.

[Configuration of Example 1]
The configuration of the electromagnetic switch 1 according to the first embodiment will be described with reference to FIG.
The electromagnetic switch 1 is fixedly disposed on one side in the axial direction of the inner periphery of the solenoid coil 2, and is disposed on the other side in the axial direction from the fixed core 3 on the inner periphery of the solenoid coil 2. The movable iron core 4 is magnetically attracted to one side in the axial direction by energizing 2, the return spring 5 that biases the movable iron core 4 to the other side in the axial direction, and a predetermined electric circuit (not shown). A fixed contact 6 fixedly disposed on the other side in the axial direction of the iron core 4, a movable contact 7 disposed on the other axial direction of the fixed contact 6, which opens and closes an electric circuit by being separated from the fixed contact 6; The contact pressure spring 8 that urges the contact 7 in one axial direction, and the urging force of the return spring 5 that is disposed between the movable iron core 4 and the movable iron core 4 and acts on the movable iron core 4 is transmitted to the movable contact 7. To urge the movable contact 7 to the other side in the axial direction. And a rod 9.

  Here, the outer periphery of the electromagnetic switch 1 is attached to the inner periphery of a bottomed cylindrical yoke 13 with the bottom side as one end side, and with the resin cover 14 with the bottom side as the other end side, It is configured by caulking and fixing to the resin cover 14. The solenoid coil 2 is wound around a resin bobbin 15 and incorporated into the bottom of the yoke 13. The fixed iron core 3 and the movable iron core 4 have a predetermined gap between the inner periphery of the bobbin 15 via the return spring 5. Arranged to form. A second fixed iron core 16 is disposed on the other end of the solenoid coil 2, and forms a magnetic circuit together with the yoke 13, the fixed iron core 3 and the movable iron core 4. The fixed contact 6 is disposed on the bottom surface of the resin cover 14 and is fixed by a nut 17 via washers 18 and 19.

  With the above configuration, when the solenoid coil 2 is energized, the movable iron core 4 is displaced to one side in the axial direction, and the movable contact 7 is biased by the contact pressure spring 8 to be displaced to one side in the axial direction. The electric circuit is closed by contacting the contact 6. When the energization of the solenoid coil 2 is stopped, the movable iron core 4 is urged by the return spring 5 and displaced to the other side in the axial direction, and the movable contact 7 is urged by the rod 9 to cause the other side in the axial direction. Is disengaged from the fixed contact 6 to open the electric circuit.

[Features of Example 1]
According to the electromagnetic switch 1 of the first embodiment, the fixed iron core 3 and the movable iron core 4 are the same interchangeable ones having the same shape and the same dimensions, and the shaft 9 of the rod 9 is regulated by the movable contact 7. . That is, according to the electromagnetic switch 1, the other end of the rod 9 is provided in a stepped shape, the hole 22 is provided in the movable contact 7, and the other end of the rod 9 is loosely fitted in the hole 22. The shaft deflection is regulated by the movable contact 7 by engaging the movable contact 7 together.

  That is, the other end portion 24 of the rod 9 is provided with a smaller diameter than the main body portion 25, passes through the hole 22, protrudes to the other axial side of the movable contact 7, and the other end portion 24 and the main body portion 25 are stepped. 26 constitutes one rod 9. Then, one end surface 27 of the movable contact 7 comes into contact with the step 26.

[Effect of Example 1]
According to the electromagnetic switch 1 of the first embodiment, the fixed iron core 3 and the movable iron core 4 are the same interchangeable ones having the same shape and the same dimensions, and the shaft 9 of the rod 9 is regulated by the movable contact 7. .
By making the fixed iron core 3 and the movable iron core 4 the same thing, there is no possibility that the fixed iron core 3 and the movable iron core 4 are mistakenly assembled, so that the defective assembly rate can be greatly reduced. Further, since the shaft deflection of the rod 9 is regulated by the movable contact 7, the movable contact 7 can be smoothly displaced in the axial direction in conjunction with the movable iron core 4.

Further, the other end of the rod 9 is provided in a step shape, and a hole 22 is provided in the movable contact 7. The rod 9 is engaged with the movable contact 7 by loosely fitting the other end of the rod 9 into the hole 22. As a result, the shaft deflection is regulated by the movable contact 7.
Thereby, while the movable contact 7 restricts the axial deflection of the rod 9, the rod 9 can reliably support the movable contact 7 from the one side in the axial direction by the step 26. For this reason, the movable contact 7 can be stably displaced in the axial direction against the urging force of the contact pressure spring 8.

According to the electromagnetic switch 1 of the second embodiment, the movable contact 7 is caulked toward the inner peripheral side in the vicinity of the rod 9 on the other end face 29 and fixed to the rod 9 as shown in FIG.
Thereby, since the rod 9 is restrained by the movable contact 7 more strongly, the axial touch of the rod 9 can be more strongly regulated.

  According to the electromagnetic switch 1 of the third embodiment, the rod 9 is provided with a thermoplastic resin as a material, and the other end of the rod 9 passes through the hole 22 as shown in FIG. The movable contact 7 is fixed to the rod 9 by protruding to the other side and the other end of the protruding rod 9 being heat caulked. That is, the other end portion 24 penetrates the hole 22 and protrudes to the other axial side of the movable contact 7 and is heated and melted to be solidified. As a result, the rod 9 is more strongly restrained by the movable contact 7 due to the adhesive force of the resin, and the axial touch of the rod 9 can be more strongly regulated.

  According to the electromagnetic switch 1 of the fourth embodiment, the rod 9 is provided with a thermoplastic resin as a material, and the movable contact 7 and the rod 9 are integrated by insert molding as shown in FIG. As a result, the adhesive force of the resin acting on the movable contact 7 is further strengthened, so that the axial touch of the rod 9 can be more strongly regulated.

[Modification]
According to the electromagnetic switches 1 of Examples 1 to 4, the step 26 is provided at the other end of the rod 9, and the movable contact 7 is supported in the axial direction by the step 26, but the movable contact 7 is not provided with the step 26. Can also be supported in the axial direction. That is, the rod 9 can also support the movable contact 7 in the axial direction by an adhering force by caulking, an adhering force of resin, or the like.

(A) is sectional drawing of an electromagnetic switch, (b) is sectional drawing which shows a rod and a movable contact (Example 1). (Example 2) which is sectional drawing which shows a rod and a movable contact. (Example 3) which is sectional drawing which shows a rod and a movable contact. (Example 4) which is sectional drawing which shows a rod and a movable contact.

Explanation of symbols

1 Electromagnetic Switch 2 Solenoid Coil 3 Fixed Iron Core 4 Movable Iron Core 5 Return Spring 6 Fixed Contact 7 Movable Contact 8 Contact Pressure Spring 9 Rod 22 Hole

Claims (5)

A fixed iron core fixed and arranged on one side in the axial direction of the inner circumference of the solenoid coil;
A movable iron core disposed on the other axial side of the fixed iron core on the inner periphery of the solenoid coil, and magnetically attracted to one axial side by energization of the solenoid coil;
A return spring for urging the movable iron core in the other axial direction;
A fixed contact that is connected to a predetermined electric circuit and is fixedly arranged on the other axial side of the movable iron core;
A movable contact that is disposed on the other side in the axial direction of the fixed contact, and opens and closes the electric circuit by being separated from the fixed contact;
A contact pressure spring for urging the movable contact in one axial direction;
A rod disposed between the movable iron core and the movable contact, and transmitting a biasing force of the return spring acting on the movable iron core to the movable contact to bias the movable contact to the other side in the axial direction. ,
When the solenoid coil is energized, the movable iron core is displaced to one side in the axial direction, and the movable contact is biased by the contact pressure spring to be displaced to the one side in the axial direction to contact the fixed contact. Closing the electrical circuit,
When energization of the solenoid coil is stopped, the movable iron core is urged by the return spring and displaced to the other side in the axial direction, and the movable contact is urged by the rod to displace to the other side in the axial direction. In an electromagnetic switch that opens from the fixed contact to open the electrical circuit,
The fixed iron core and the movable iron core are the same interchangeable ones having the same shape and the same dimensions,
The electromagnetic switch according to claim 1, wherein the rod has a shaft runout restricted by the movable contact. The electromagnetic switch according to claim 1,
The other end of the rod is provided in a step shape, and the movable contact is provided with a hole,
2. The electromagnetic switch according to claim 1, wherein the rod has an axial runout restricted by the movable contact by loosely fitting the other end of the rod into the hole and engaging the movable contact. The electromagnetic switch according to claim 2,
The electromagnetic switch according to claim 1, wherein the movable contact is caulked toward an inner peripheral side and fixed to the rod. The electromagnetic switch according to claim 2,
The rod is provided with a thermoplastic resin as a material,
The other end of the rod penetrates the hole and projects to the other axial side of the movable contact,
An electromagnetic switch, wherein the movable contact is fixed to the rod by heat caulking the other end of the protruding rod. The electromagnetic switch according to claim 1,
The rod is provided with a thermoplastic resin as a material,
The electromagnetic switch, wherein the movable contact and the rod are integrated by insert molding.

Images