JP2007115526A - Electromagnetic relay and starter for engine starting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To alleviate a collision of a movable iron core 4 to a fixed iron core 3 without mounting an elastic body to a colliding region, in an electromagnetic relay. <P>SOLUTION: One side gap surface 37 which forms unevenness in a hoop direction is formed on the fixed iron core 3, and the other side gap surface 38 having unevenness which fits to the unevenness of the one side gap surface 37 and forming a gap with the one side gap surface 37 is formed on the movable iron core 4. The one side gap surface 37 and the other side gap surface 38 include inclined surfaces 39, and hence the unevenness is formed. Therefore, when the movable iron core 4 abuts against the fixed core 3, the movable iron core 4 rotates along the inclined surfaces 39 until the unevennesses fit to each other while the movable iron core 4 progresses toward the fixed iron core 3 side in an axial direction. Consequently, a part of the collision force of the movable iron core 4 is consumed in a form of a rotation force. Consequently, the collision of the movable iron core 4 to the fixed iron core 3 can be alleviated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnetic relay that closes contacts using a magnetic attractive force generated by energizing a solenoid.

  2. Description of the Related Art Conventionally, an electromagnetic relay that closes a contact using a magnetic attractive force generated by energizing a solenoid has been widely used. According to this electromagnetic relay, the stationary iron core and the movable iron core are excited by energizing the solenoid, and the movable iron core is displaced toward the stationary iron core. Then, in conjunction with the displacement of the movable iron core toward the fixed iron core, the movable contact comes into contact with the fixed contact incorporated in a predetermined electric circuit, thereby closing the electric circuit.

In this electromagnetic relay, the movable iron core collides with the fixed iron core when the movable iron core is displaced toward the fixed iron core. Various techniques for mitigating this collision have been considered. For example, a technique has been considered in which an elastic body is attached to at least one of a collision portion of a movable iron core and a collision portion of a fixed iron core to alleviate the collision of the movable iron core with the fixed iron core (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-135321

  However, according to this technique, an elastic body is newly added, leading to an increase in cost. In addition, since the magnetic resistance increases and the magnetic attractive force decreases due to the presence of the elastic body, it is necessary to increase the energization amount to the solenoid. Furthermore, if the elastic body deteriorates, the effect of mitigating the collision is reduced, so it needs to be replaced.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to alleviate the collision of the movable iron core to the fixed iron core without attaching an elastic body to the collision site in the electromagnetic relay. It is in.

[Means of Claim 1]
The electromagnetic relay according to the first aspect closes the contacts using a magnetic attractive force generated by energizing the solenoid. This electromagnetic relay has a fixed iron core provided so that the one side gap surface forming the gap is uneven in the circumferential direction, and an unevenness that fits into the unevenness of the one side gap surface, and the gap together with the one side gap surface. The other side gap surface to be formed is provided, and includes a movable iron core that is magnetically attracted to the fixed iron core and contacts the fixed iron core. The one-side gap surface and the other-side gap surface are provided with an inclined surface that is inclined in the circumferential direction to form irregularities.

  As a result, when the movable iron core comes into contact with the fixed iron core, the movable iron core moves in the axial direction toward the fixed iron core and moves in the circumferential direction until the concave and convex portions are fitted along the inclined surface (that is, rotates). . For this reason, part of the collision force of the movable iron core is consumed by the rotational force, so that the collision of the movable iron core with the fixed iron core can be mitigated without attaching an elastic body to the collision site.

[Means of claim 2]
According to the electromagnetic relay of claim 2, the fixed iron core has a protruding portion that protrudes in the axial direction from the one-side gap surface, and the movable iron core is recessed in the axial direction from the other-side gap surface, and is fitted with the protruding portion. It has an indented part that fits together.
As a result, when the movable iron core collides with the fixed iron core, the axis of the movable iron core and the fixed iron core can be reliably matched. For this reason, a movable iron core can be smoothly rotated in the case of a collision with a fixed iron core.

[Means of claim 3]
The starter according to claim 3 uses the electromagnetic relay according to claim 1 or claim 2.
Thereby, the collision sound at the time of starter operation can be reduced.

  The electromagnetic relay of the best mode 1 closes the contacts using a magnetic attractive force generated by energizing the solenoid. This electromagnetic relay has a fixed iron core provided so that the one side gap surface forming the gap is uneven in the circumferential direction, and an unevenness that fits into the unevenness of the one side gap surface, and the gap together with the one side gap surface. The other side gap surface to be formed is provided, and includes a movable iron core that is magnetically attracted to the fixed iron core and contacts the fixed iron core. The one-side gap surface and the other-side gap surface are provided with an inclined surface that is inclined in the circumferential direction to form irregularities.

The fixed iron core has a protruding portion that protrudes in the axial direction from the one-side gap surface, and the movable iron core has a hollow portion that is recessed in the axial direction from the other-side gap surface and that fits the protruding portion.
And this electromagnetic relay is used for the starter for engine starting.

[Configuration of Example 1]
The structure of the electromagnetic relay 1 of Example 1 is demonstrated using FIG. 1 and FIG. The electromagnetic relay 1 is used for an engine starter (not shown).

  The electromagnetic relay 1 is energized by energizing the solenoid 2 that forms a magnetic circuit when energized, the fixed core 3 that forms part of the magnetic circuit, and is energized by energizing the solenoid 2, and partially energizes the magnetic circuit. In addition, the movable iron core 4 that is magnetically attracted and displaced toward the fixed iron core 3, the two fixed contacts 5 that are connected to a predetermined electric circuit (not shown, hereinafter referred to as an external circuit), and the fixed iron core 4 are fixed. A movable contact 6 that contacts the fixed contact 5 in conjunction with the displacement toward the iron core 3 and closes the external circuit, a rod 7 that links the movable contact 6 with the displacement of the movable iron core 4 toward the fixed iron core 3, A contact cover 8 or the like that accommodates the fixed contact 5 and the movable contact 6 and keeps airtight between the contacts is provided.

  The solenoid 2 is a coil wound around the bobbin 12. The solenoid 2 is energized by receiving electric power from an in-vehicle battery (not shown) by turning on the ignition key, forms a magnetic circuit, and magnetically attracts the movable iron core 4 toward the fixed iron core 3 side. The outer peripheral side of the solenoid 2 is covered with a cylindrical yoke 13.

  The fixed iron core 3 is fixed facing the movable iron core 4 on the inner peripheral side of the solenoid 2 to form a gap. The fixed iron core 3 extends toward one end side in the axial direction, and is provided integrally with one end side magnetic plate 15 for passing magnetic flux through one end side of the bobbin 12. A contact pressure spring 16 that urges the movable contact 6 toward the fixed contact 5 is accommodated on the inner peripheral side of the one end side magnetic plate 15 via an insulating member 17.

  The movable iron core 4 is disposed so as to be slidable in the axial direction and rotatable in the circumferential direction on the inner peripheral side of the solenoid 2 via a cylindrical sleeve 19 made of a nonmagnetic material. And the movable iron core 4 is arrange | positioned facing the fixed iron core 3 on the inner peripheral side of the solenoid 2, forms a gap, and transfers magnetic flux on one end side. In addition, the magnetic flux transfer on the other end side of the movable iron core 4 is performed by the other end side magnetic plate 21 disposed on the other end side of the bobbin 12 via the elastic body 20.

  Further, a recess 22 is provided on the inner peripheral side of the movable iron core 4, and a return spring 23 that urges the movable iron core 4 toward the other end side is accommodated. One end of the return spring 23 is attached to the fixed iron core 3. Further, the other end portion of the rod 7 is accommodated on the inner peripheral side of the return spring 23. When the movable iron core 4 is magnetically attracted toward the fixed iron core 3 by energizing the solenoid 2, the innermost surface of the recess 22 abuts the other end of the rod 7. Thereby, the movable iron core 4 gives the pressing force which urges | biases to the one end side with respect to the rod 7, and displaces the rod 7 to the one end side.

  Each of the fixed contacts 5 is a contact so as to maintain a conductive state with a battery terminal 26 connected to the vehicle-mounted battery via a battery cable and a motor terminal 27 connected to an energization circuit of the starter motor via a motor lead wire. It is fixed and arranged inside the cover 8.

  The movable contact 6 is sandwiched between the insulating members 29 and 30 in the axial direction, held at one end of the rod 7, and displaced integrally with the rod 7 in the axial direction. The movable contact 6 is disposed inside the contact cover 8 so as to face the fixed contact 5. The movable contact 6 is attached to one end of a contact pressure spring 16 via an insulating member 30 and is urged toward the fixed contact 5. At the same time, the movable contact 6 is biased in a direction away from the fixed contact 5 with the other end of the spring 31 attached via the insulating member 29.

  Here, the contact pressure spring 16 and the spring 31 are set so that the biasing force of the spring 31 is stronger than the biasing force of the contact pressure spring 16. Therefore, when the solenoid 2 is not energized, the urging force acting on the other end side is stronger than the urging force acting on the one end side, so that the movable contact 6 is separated from the fixed contact 5. Quiesce. For this reason, the external circuit comprised between a vehicle-mounted battery and an electricity supply circuit is opened.

  When the solenoid 2 is energized, a pressing force is applied from the movable iron core 4 to the rod 7. As a result, the biasing force acting on one end side is stronger than the biasing force acting on the other end side, so that the movable contact 6 and the rod 7 are displaced to one end side, that is, the fixed contact 5 side, and are movable. The contact 6 contacts the fixed contact 5. As a result, the external circuit is closed, electric power is supplied from the in-vehicle battery to the energization circuit of the starter motor, the starter is activated, and the engine is started.

  As described above, the rod 7 is integrated with the movable contact 6 held at one end, and is brought into contact with the movable iron core 4 at the other end. Further, the rod 7 is disposed so as to pass through a round hole opened in the central portion of the fixed iron core 3, and is supported by the insulating member 17 and slides in the axial direction.

  The contact cover 8 holds the battery terminal 26 and the motor terminal 27 in the axial direction, and accommodates the fixed contact 5 and the movable contact 6 inside. One end of a spring 31 is attached to the contact cover 8. The one end side magnetic plate 15 is disposed on the other end side of the contact cover 8 via a seal member 33, and is fixed by caulking by a frame 34 that forms an outline of the electromagnetic relay 1.

[Features of Example 1]
According to the electromagnetic relay 1 of the first embodiment, a gap is formed so as to face each other, and when the movable iron core 4 abuts against the fixed iron core 3, one side and the other side gap surfaces 37 and 38 that are in surface contact with each other are provided. It has been. Here, the one side gap surface 37 is provided at the other end of the fixed iron core 3, and the other side gap surface 38 is provided at one end of the movable iron core 4. That is, the one side gap surface 37 forms a collision part of the fixed iron core 3, and the other side gap surface 38 forms a collision part of the movable iron core 4.

  The one-side and other-side gap surfaces 37 and 38 are provided so as to be uneven in the circumferential direction. Further, as shown in FIG. 2, the unevenness is formed by providing an inclined surface 39 inclined in the circumferential direction. The inclined surface 39 is a flat surface, for example, and is provided so that a plurality of flat surfaces having different inclination directions are successively connected in the circumferential direction, and one side and the other side gap surfaces 37 and 38 are configured. The ridges formed by crossing adjacent planes alternately form the tops 40 and the bottoms 41 of the projections and depressions, and are formed radially outward in the radial direction. Moreover, the one side and the other side gap surfaces 37 and 38 are provided so as to be fitted to each other.

  The portion on the inner diameter side of the one-side gap surface 37 forms a protruding portion 44 that protrudes in the axial direction. A round hole through which the rod 7 passes in the axial direction penetrates and opens in a portion on the inner diameter side of the protruding portion 44. A portion on the inner diameter side with respect to the other-side gap surface 38 is recessed in the axial direction to form a recessed portion 46 that fits with the protruding portion 44. A recessed portion 22 that accommodates the return spring 23 and the other end portion of the rod 7 is opened in a portion on the inner diameter side of the recessed portion 46.

[Operation of Example 1]
When energization of the solenoid 2 starts and the movable iron core 4 is displaced toward the fixed iron core 3 and comes into contact with the fixed iron core 3, the other-side gap surface 38 comes into contact with the one-side gap surface 37. At this time, the apex 40 of one of the one side and the other side gap surfaces 37 and 38 contacts the other inclined surface 39. When the movable iron core 4 is further displaced toward the fixed iron core 3, one apex 40 moves relatively in the circumferential direction along the other inclined surface 39 (that is, the movable iron core 4 moves relative to the fixed iron core 3. And move toward the fixed core 3 while rotating. Thereby, the one top 40 substantially coincides with the other bottom 41 in the circumferential direction, and the unevenness of the one-side gap surface 37 is fitted into the unevenness of the other-side gap surface 38.

[Effect of Example 1]
The electromagnetic relay 1 according to the first embodiment has a fixed iron core 3 provided so that the one-side gap surface 37 forming the gap is uneven in the circumferential direction, and unevenness that fits into the unevenness of the one-side gap surface 37. The other side gap surface 38 which forms a gap with the one side gap surface 37 is provided, and includes the movable iron core 4 which is magnetically attracted to the fixed iron core 3 and contacts the fixed iron core 3. The one-side gap surface 37 and the other-side gap surface 38 are provided with an inclined surface 39 that is inclined in the circumferential direction to form irregularities.
Thereby, when the movable iron core 4 comes into contact with the fixed iron core 3, the movable iron core 4 moves toward the fixed iron core 3 in the axial direction, and rotates along the inclined surface 39 until the irregularities are fitted. For this reason, since a part of the collision force of the movable iron core 4 is consumed by the rotational force, the collision of the movable iron core 4 with the fixed iron core 3 can be mitigated.

The fixed iron core 3 has a protruding portion 44 that protrudes in the axial direction from the one-side gap surface 37, and the movable iron core 4 is recessed in the axial direction from the other-side gap surface 38, and is a recessed portion that fits the protruding portion 44. 46.
Thereby, when the movable iron core 4 collides with the fixed iron core 3, the axis of the movable iron core 4 and the fixed iron core 3 can be reliably matched. For this reason, the movable iron core 4 can smoothly rotate in the event of a collision with the fixed iron core 3.

The electromagnetic relay 1 is used in a starter for starting an engine.
Thereby, the collision sound at the time of starter operation can be reduced.

[Modification]
According to the electromagnetic relay 1 of the first embodiment, the inclined surface 39 provided to make irregularities in the circumferential direction is a flat surface, but may be a curved surface as shown in FIG.
In the first embodiment, the protruding portion 44 is provided so as to protrude in the axial direction from the one-side gap surface 37, and the recessed portion 46 is provided so as to be recessed in the axial direction from the other-side gap surface 38. A depression may be provided on the surface 37 and a protrusion may be provided on the other gap surface 38.

It is a block diagram of an electromagnetic relay (Example 1). (A) is a bottom view which shows the principal part of a fixed iron core, (b) is a side view which shows the principal part of a fixed iron core, (c) is a side view which shows the principal part of a movable iron core (Example) 1). (A) is a side view which shows the principal part of a fixed iron core, (b) is a side view which shows the principal part of a movable iron core (modification).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 2 Solenoid 3 Fixed iron core 4 Movable iron core 37 One side gap surface 38 The other side gap surface 39 Inclined surface 44 Projection part 46 Indentation part

Claims (3)

In the electromagnetic relay that closes the contacts using the magnetic attractive force generated by energizing the solenoid,
A fixed iron core provided so that one side gap surface forming a gap is uneven in the circumferential direction;
A movable core that is provided with an unevenness that fits with the unevenness of the one-side gap surface and that forms a gap with the one-side gap surface, and that is magnetically attracted to the fixed core and contacts the fixed core; With
The electromagnetic relay according to claim 1, wherein the one-side gap surface and the other-side gap surface are provided with an inclined surface that is inclined in a circumferential direction to form irregularities. The electromagnetic relay according to claim 1,
The fixed iron core has a protruding portion protruding in the axial direction from the one side gap surface,
The movable iron core is recessed in the axial direction from the gap surface on the other side, and has a recessed portion that fits into the protruding portion.   A starter for starting an engine using the electromagnetic relay according to claim 1.

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