JP2011113780A - Contacting point contact pressure adjusting method of electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To aim at downsizing of an electromagnetic relay capable of adjusting contacting point contact pressure. <P>SOLUTION: A core 3 is inserted into a bobbin 1a up to a temporary fixed position, then the core 3 is moved to the bobbin 1a up to a position where a movable contact 7 and a fixed contact 8 are in contact with each other in a state in which a thickness gage 10 provided in a predetermined thickness is arranged between the core 3 and an armature 5 to be conducted to a coil 2 (a state in Fig.4). According to this, as the coil 2 is energized with the thickness gage 10 in a removed state, in a process of the armature 5 moving toward a core 3 side, a spring 6 is bent after the time of contacting of the movable contact 7 and a fixed point. Since an amount of bending volume of the spring 6 is proportional to a thickness of the thickness gage 10, an amount of bending volume of the spring 6 is adjusted by the thickness of the thickness gage 10, and as a result, a contact pressure between the movable contact 7 and the fixed contact 8 can be adjusted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a contact contact pressure adjusting method for an electromagnetic relay that opens and closes an electric circuit.

  In conventional electromagnetic relays, through holes are formed in a plate-shaped holding member that holds fixed contacts, and the fixed contacts are moved to the movable contact side by plastically deforming the through holes, thereby adjusting the contact interval and eventually energizing. The contact contact pressure at the time is adjusted (for example, see Patent Document 1).

JP 2003-59381 A

  However, the conventional electromagnetic relay has a large holding member in which a through hole is formed, which is one of the factors that hinder the miniaturization of the electromagnetic relay.

  In view of the above points, an object of the present invention is to reduce the size of an electromagnetic relay capable of adjusting contact contact pressure.

  In order to achieve the above object, according to the first aspect of the present invention, the coil (2) wound around the outer periphery of the cylindrical bobbin (1a) to form a magnetic field when energized and the inner periphery of the bobbin (1a) are inserted. The core (3) that generates a magnetic attraction force by energizing the coil (2) and the core (3) that is disposed opposite the core (3) and is attracted to the core (3) side by the magnetic attraction force of the core (3) Armature (5), plate-like spring (6) fixed to the armature (5), movable contact (7) attached to the free end of the spring (6), and opposed to the movable contact (7) A contact contact pressure adjusting method for an electromagnetic relay comprising a fixed contact (8) arranged in the manner described above, wherein the core (3) is inserted into the bobbin (1a) to a temporarily fixed position, and then the predetermined thickness Thickness gauge (10) set to core (3) and armature (5 The core (3) is moved with respect to the bobbin (1a) to a position where the movable contact (7) and the fixed contact (8) come into contact with each other while the coil (2) is energized. It is characterized by.

  According to this, when the coil (2) is energized with the thickness gauge (10) removed, in the process in which the armature (5) moves toward the core (3), the movable contact (7) and the fixed point are The spring (6) bends from the point of contact. Since the amount of bending of the spring (6) at this time is proportional to the thickness of the thickness gauge (10), the amount of bending of the spring (6) is adjusted by the thickness of the thickness gauge (10), and consequently the movable contact (7). And the contact pressure between the fixed contact (8) can be adjusted. Therefore, since it is not necessary to form a through hole in the holding member that holds the fixed contact (8), the holding member can be made smaller, and the electromagnetic relay that can adjust the contact contact pressure can be downsized. .

  When carrying out the contact contact pressure adjusting method for an electromagnetic relay according to claim 1 as in the invention according to claim 2, the thickness gauge (10) is placed between the core (3) and the armature (5). The temporary fixed position is set so that the movable contact (7) and the fixed contact (8) do not come into contact with each other when the coil (2) is energized.

  The invention according to claim 3 is characterized in that, in the contact contact pressure adjusting method for an electromagnetic relay according to claim 1 or 2, the core (3) is fixed to the bobbin (1a) by press-fitting.

  According to this, when the movement of the core (3) with respect to the bobbin (1a) is stopped, the relative position between the core (3) and the bobbin (1a) is automatically fixed, so that the contact contact pressure adjustment work can be easily performed. Can do.

  According to a fourth aspect of the present invention, in the electromagnetic contact contact pressure adjusting method according to the third aspect, the bobbin (1a) is made of resin.

  According to this, even after temporarily fixing the core (3) to the bobbin (1a), the core (3) can be easily moved relative to the bobbin (1a).

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a front view of the electromagnetic relay which employ | adopted the method which concerns on one Embodiment of this invention. It is a top view of the electromagnetic relay of FIG. It is a figure which shows the intermediate state of the contact contact pressure adjustment process of the electromagnetic relay of FIG. It is a figure which shows the completion | finish state of the contact contact pressure adjustment process of the electromagnetic relay of FIG. It is a perspective view which shows the thickness gauge of FIG.

  FIG. 1 is a front view of an electromagnetic relay employing a method according to an embodiment of the present invention, and FIG. 2 is a plan view of the electromagnetic relay of FIG. FIG. 3 is a view showing an intermediate state of the contact contact pressure adjusting step, and is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a diagram showing the end state of the contact contact pressure adjusting step, and is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a perspective view showing the thickness gauge of FIG.

  As shown in FIGS. 1-5, the resin spool 1 includes a bobbin 1a, a first base portion 1b, and a second base portion 1c. The bobbin 1a includes a cylindrical tube portion having a through-hole and a disk-shaped flange portion extending radially outward from both ends of the tube portion. The bobbin 1a is connected with the 1st base part 1b and the 2nd base part 1c in the outer peripheral part of the collar part.

  A coil 2 is wound around the outer periphery of the cylindrical portion of the bobbin 1a. A cylindrical core 3 that forms a magnetic path is inserted into the inner periphery (that is, the through hole) of the cylindrical portion of the bobbin 1a. When the coil 2 is energized, the coil 2 forms a magnetic field, and the core 3 generates a magnetic attractive force.

  The core 3 is fixed to the bobbin 1a by press-fitting. For this reason, it is desirable to form the spool 1 with a resin (for example, a liquid crystalline polymer (LCP)) having a characteristic rich in toughness. Further, a knurling process is applied to the portion of the core 3 that is press-fitted into the bobbin 1a to prevent rotation.

  The stationary 4 that forms the magnetic path is substantially L-shaped. The stationary 4 is located outside the coil 2 and extends in the vertical direction in FIG. 2, and the coil 2 and the core 3. 2 has a second plate portion 4b which is located on one end side and extends in the right direction from the lower end of the first plate portion 4a in FIG. The stationary 4 is caulked and joined to the end of the core 3 by the second plate portion 4b.

  The armature 5 forming the magnetic path has one end facing the core 3, the other end held by the first plate part 4 a, and a spring 6 caulked to the intermediate part. The armature 5 can swing around the other end (the portion held by the first plate portion 4a) as a fulcrum. More specifically, the armature 5 is attracted to the core 3 side at one end side (the side facing the core 3) with the other end as a fulcrum by the magnetic attraction force of the core 3.

  The spring 6 is plate-shaped and bent into an approximately L-shape, one end is caulked and coupled to the first plate portion 4a, the middle is caulked and coupled to the armature 5, and the movable contact 7 is connected to the free end at the other end. It is attached. A fixed contact 8 is disposed at a position facing the one surface side of the movable contact 7, and a stopper 9 is disposed at a position facing the other surface side of the movable contact 7. The fixed contact 8 is attached to a terminal 11 as a holding member fixed to the first base portion 1b.

  In the electromagnetic relay configured as described above, when the coil 2 is energized, the armature 5 is attracted to the core 3 side, the movable contact 7 comes into contact with the fixed contact 8, the electric circuit is closed, and an electric load (not shown) is energized. On the other hand, when the energization to the coil 2 is cut off, the movable contact 7 is moved to the stopper 9 side by the restoring force of the spring 6, the movable contact 7 is separated from the fixed contact 8, and the energization to the electric load is stopped.

  Next, a method for adjusting the contact pressure between the movable contact 7 and the fixed contact 8 will be described.

  First, in the temporary positioning step, the core 3 is press-fitted into a wound bobbin 1a to a temporarily fixed position (details will be described later). Note that an arrow B in FIG. 3 indicates the press-fitting direction of the core 3.

  Next, in the component joining step, the stationary 4 is caulked and joined to the core 3. Further, the spring 6 in which the armature 5 and the movable contact 7 are assembled is caulked and coupled to the stationary 4.

  Next, in this positioning step, a plate-like thickness gauge 10 set to a predetermined thickness is disposed between the core 3 and the armature 5, and the coil 2 is energized to attract the armature 5 to the core 3 side ( (See FIG. 3). At this time, in order to reduce the variation of the contact pressure after adjusting the contact pressure, the surface close to the movable contact 7 on the surface where the core 3 and the armature 5 face each other (the right end portion of the core 3 in the paper surface of FIG. 3). It is desirable to arrange the thickness gauge 10. Note that the temporary fixing position of the core 3 in the temporary positioning step is set so that the movable contact 7 and the fixed contact 8 do not come into contact with each other in the armature suction state.

  Subsequently, the armature 5 or the spring 6 is pushed in the direction of arrow B with a jig (not shown) while the armature is sucked. At this time, the core 3, the stationary 4, the armature 5, the spring 6, the movable contact 7, and the thickness gauge 10 move relative to the bobbin 1a. Then, when the contact between the movable contact 7 and the fixed contact 8 is detected by electrical continuity, the movement of the core 3 and the like by the jig is stopped, and the positioning process is completed (see FIG. 4).

  Then, by stopping energization of the coil 2 and removing the thickness gauge 10, the adjustment of the contact pressure between the movable contact 7 and the fixed contact 8 is completed. That is, when the coil 2 is energized after adjusting the contact pressure, the armature 5 is attracted to the core 3 side to the position where it contacts the core 3. Therefore, the armature 5 moves further to the core 3 side by an amount corresponding to the thickness of the thickness gauge 10 than the position shown in FIG. On the other hand, since the movable contact 7 cannot move from the time when the armature 5 moves to the position shown in FIG. 4 (that is, when the movable contact 7 and the fixed point 8 contact each other), the spring 6 bends.

  Since the amount of bending of the spring 6 at this time is proportional to the thickness of the thickness gauge 10, the amount of bending of the spring 6 is adjusted by the thickness of the thickness gauge 10, and consequently the contact pressure between the movable contact 7 and the fixed contact 8 is adjusted. can do.

2 Coil 3 Core 5 Armature 6 Spring 7 Movable contact 8 Fixed contact 10 Thickness gauge 1a Bobbin

Claims (4)

A coil (2) wound around the outer periphery of a cylindrical bobbin (1a) to form a magnetic field when energized, and inserted into the inner periphery of the bobbin (1a) to energize the coil (2) to generate a magnetic attractive force. The generated core (3), the armature (5) disposed opposite to the core (3) and attracted to the core (3) side by the magnetic attraction force of the core (3), and the armature (5 ) Fixed to a plate-like spring (6), a movable contact (7) attached to the free end of the spring (6), and a fixed contact (opposed to the movable contact (7)) 8) a contact contact pressure adjusting method for an electromagnetic relay comprising:
Insert the core (3) to the temporarily fixed position with respect to the bobbin (1a),
Next, in a state where a thickness gauge (10) set to a predetermined thickness is disposed between the core (3) and the armature (5) and the coil (2) is energized, the movable contact (7 ) And the fixed contact (8) are moved to a position where the core (3) is moved with respect to the bobbin (1a) to a position where the fixed contact (8) abuts.   When the thickness gauge (10) is disposed between the core (3) and the armature (5) and the coil (2) is energized, the movable contact (7) and the fixed contact (8) The method for adjusting contact contact pressure of an electromagnetic relay according to claim 1, wherein the temporary fixing position is set so that the contact does not contact with the electromagnetic relay.   The contact contact pressure adjusting method for an electromagnetic relay according to claim 1 or 2, wherein the core (3) is fixed to the bobbin (1a) by press-fitting.   The method for adjusting contact contact pressure of an electromagnetic relay according to claim 3, wherein the bobbin (1a) is made of resin.

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