JP2015046275A - Contact device and electromagnetic relay mounted with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device capable of further suppressing oscillation, and an electromagnetic relay mounted with the contact device.SOLUTION: A contact device 1 comprises a contact block 3 including a fixed terminal 35 in which a fixed contact point 35a is formed and a movable contact 29 in which a movable contact point 29b is formed, and a drive block 2 including a drive shaft 25 in which a movable contact 29 is mounted and for driving the movable contact 29. An inner receptacle block 90 including the contact block 3 and the drive shaft 25 is mounted in a case 7 via a first fixed part 10. A coil bobbin 11 is mounted in the case 7 via a second fixed part 20. In a state in which the inner receptacle block 90 and the coil bobbin 11 are mounted in the case 7, a gap 80 is formed between the coil bobbin 11 and the inner receptacle block 90. The inner receptacle block 90 is brought into contact with the coil bobbin 11 by a linear contact part 81a or a point-like contact part 81b.

Description

  The present invention relates to a contact device and an electromagnetic relay equipped with the contact device.

  Conventionally, as a contact device, a contact block having a fixed terminal provided with a fixed contact and a movable contact provided with a movable contact contacting and separating from the fixed contact, a drive shaft and a coil for driving the movable contact are wound. What is provided with the drive block which has a coil bobbin rotated is known (for example, refer to patent documents 1).

  In Patent Document 1, an internal unit block having a contact block and a drive shaft is attached to a case via a first fixing portion, and a coil bobbin is attached to the case via a second fixing portion.

JP 2009-199894 A

  However, in the above conventional technique, the coil bobbin is caulked and fixed to the inner unit block, and the coil bobbin and the inner unit block are in surface contact with the inner unit block and the coil bobbin being attached to the case. Therefore, vibrations such as operation sound from the inner unit block are easily transmitted to the coil bobbin, and there is a problem that the vibration of the contact device is increased.

  Then, an object of this invention is to obtain the contact device which can suppress a vibration more, and the electromagnetic relay which mounts the said contact device.

  According to a first aspect of the present invention, there is provided a contact block including a fixed terminal in which a fixed contact is formed, and a movable contact in which a movable contact that contacts and separates from the fixed contact is formed. A drive block having a drive shaft to which the movable contact is attached and a coil bobbin around which a coil is wound, and a drive block for driving the movable contact so that the movable contact comes in contact with and away from the fixed contact; An inner block having a block, the movable contact, and the drive shaft is attached to the case via a first fixed part, and the coil bobbin is attached to the case via a second fixed part, A gap is formed between the coil bobbin and the inner block in a state where the inner block and the coil bobbin are attached to the case. The inner block and the coil bobbin There are in contact with the contact portion, and summarized in that the shape of the contact portion is at least one of the shape of the linear and punctate.

  The gist of the second feature of the present invention is that the contact portion includes a protruding portion formed on at least one of the inner block and the coil bobbin.

  The gist of the third feature of the present invention is that the contact portion is formed between opposing surfaces of the inner unit block and the coil bobbin that face each other in a direction intersecting the drive shaft direction.

  The gist of the fourth feature of the present invention is that the contact portion is formed between opposing surfaces of the inner unit block and the coil bobbin facing each other in the drive shaft direction.

  The fifth feature of the present invention is summarized in that the contact device is mounted on an electromagnetic relay.

  ADVANTAGE OF THE INVENTION According to this invention, the electromagnetic relay which mounts the contact device which can suppress a vibration more, and the said contact device can be obtained.

It is a perspective view which shows the electromagnetic relay concerning 1st Embodiment of this invention. It is a disassembled perspective view of the electromagnetic relay concerning 1st Embodiment of this invention. It is a disassembled perspective view which decomposes | disassembles and shows a part of contact apparatus concerning 1st Embodiment of this invention. It is a figure which shows the electromagnetic relay concerning 1st Embodiment of this invention, Comprising: (a) is a sectional side view, (b) is a sectional side view cut | disconnected in the direction orthogonal to Fig.4 (a). It is a disassembled perspective view which shows typically the state before attaching the internal unit block and coil bobbin concerning 1st Embodiment of this invention to a case. It is a side view showing typically the state where the internal unit block and coil bobbin concerning a 1st embodiment of the present invention were attached to a case. It is a figure which shows typically the coil bobbin concerning 1st Embodiment of this invention, Comprising: (a) is a front view, (b) is a sectional side view. It is a side view which shows typically the state which attached the internal unit block and coil bobbin concerning 2nd Embodiment of this invention to the case. It is a figure which shows typically the coil bobbin concerning 2nd Embodiment of this invention, Comprising: (a) is a front view, (b) is a sectional side view. It is a side view which shows typically the state which attached the internal unit block and coil bobbin concerning 3rd Embodiment of this invention to the case. It is a figure which shows typically the coil bobbin concerning 3rd Embodiment of this invention, Comprising: (a) is a front view, (b) is a sectional side view.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the upper, lower, left, and right in FIG.

  Moreover, the same component is contained in the following several embodiment. Therefore, in the following, common reference numerals are given to those similar components, and redundant description is omitted.

(First embodiment)
The electromagnetic relay 100 according to the present embodiment is a so-called normally open type in which the contact is turned off in an initial state, and as shown in FIGS. 3 is integrally provided. The contact device 1 is housed in a hollow box type case 5. It is also possible to use a so-called normally closed electromagnetic relay that is contact-on in the initial state.

  The case 5 includes a substantially rectangular case base 7 and a case cover 9 that accommodates mounting components such as the drive unit 2 and the contact unit 3 disposed so as to cover the case base 7.

  The case base 7 is provided with a pair of slits 71 and 71 to which the pair of coil terminals 20 are respectively attached on the lower side in FIG. In addition, the case base 7 is provided with a pair of slits 72, 72 on which the terminal portions 10b, 10b of the pair of main terminals 10, 10 are mounted on the upper side in FIG. On the other hand, the case cover 9 is formed in a hollow box shape in which the case base 7 side is opened. The insertion hole 71 has substantially the same shape as that of the coil terminal 20, and the insertion hole 72 has substantially the same shape as that of the terminal portion 10 b of the main terminal 10.

  The drive block 2 includes a hollow cylindrical coil bobbin 11 around which the coil 13 is wound, and a pair of coil terminals 20 fixed to the coil bobbin 11 and connected to both ends of the coil 13.

  The coil bobbin 11 includes substantially circular flange portions 11c protruding in the circumferential direction at both upper and lower ends of the cylindrical portion, and a winding drum portion 11d around which the coil 13 is wound is formed between the upper and lower flange portions 11c. ing.

  The coil terminals 20 are formed in a flat plate shape using a conductive material such as copper, and the pair of coil terminals 20 are provided with relay terminals 20a. Each relay terminal 20a is soldered in a state in which lead wires at both ends of the coil 13 wound around the coil bobbin 11 are entangled.

  The drive block 2 is driven by energizing the coil 13 via the pair of coil terminals 20. By driving the drive block 2 in this way, a contact constituted by a fixed contact 35a and a movable contact 29b of the contact block 3 to be described later is opened and closed to switch between conduction and non-conduction between the pair of fixed terminals 35. Can be done.

  The drive block 2 includes a yoke 6 made of a magnetic material and surrounding the coil bobbin 11. In the present embodiment, the yoke 6 is composed of a rectangular yoke upper plate 21 that abuts on the upper end surface of the coil bobbin 11 and a rectangular yoke 19 that abuts on the lower end surface and side surfaces of the coil bobbin 11. , Open in the front-rear direction.

  The yoke 19 is disposed between the coil 13 and the case 5, and the yoke 19 includes a bottom wall 19a and a pair of side walls 19b and 19b rising from the periphery of the bottom wall 19a. In the present embodiment, the bottom wall 19a and the pair of side walls 19b, 19b are formed integrally by bending a single plate. Further, an annular insertion hole 19c is formed in the bottom wall 19a of the yoke 19, and a bush 16 made of a magnetic material is attached to the insertion hole 19c. And the yoke upper board 21 mentioned above is arrange | positioned so that the coil 13 wound around the coil bobbin 11 may be covered in the front end side (upper end side) of a pair of side wall 19b of the yoke 19 and 19b.

  The drive block 2 is fixed inside the cylinder of the coil bobbin 11 and magnetized by the energized coil 13, and the fixed iron core 15 is opposed in the vertical direction (axial direction), and the cylinder of the coil bobbin 11. And a movable iron core 17 disposed therein. The fixed iron core 15 is formed in a substantially columnar shape, and a flange portion 15b is provided to protrude in the circumferential direction at the upper end of the projection portion 15a formed in the insertion hole 15c.

  Furthermore, in this embodiment, the drive block 2 includes a plunger cap 14 made of a magnetic material and formed in a bottomed cylindrical shape with an upper surface opened between the fixed iron core 15 and the movable iron core 17 and the coil bobbin 11. I have. In the present embodiment, the plunger cap 14 is disposed in the insertion hole 11 a formed at the center of the coil bobbin 11. At this time, an annular seat surface 11b is formed on the upper side of the coil bobbin 11, and the flange portion 14a of the plunger cap 14 is placed on the seat surface 11b. And the protrusion part 14b of the plunger cap 14 is inserted in the insertion hole 11a. Further, the fixed iron core 15 and the movable iron core 17 are accommodated in a plunger cap 14 provided inside the cylinder of the coil bobbin 11. The fixed iron core 15 is disposed on the opening side of the plunger cap 14.

  Further, the fixed iron core 15 and the movable iron core 17 are each formed in a columnar shape whose outer diameter is substantially the same as the inner diameter of the plunger cap 14, and the movable iron core 17 slides inside the cylinder of the plunger cap 14. It has become. The moving range of the movable iron core 17 is set between an initial position away from the fixed iron core 15 and a contact position where the movable iron core 15 contacts the fixed iron core 15. Further, between the fixed iron core 15 and the movable iron core 17, a return spring 23 made of a coil spring and energizing the movable iron core 17 in a direction to return it to the initial position is interposed. The movable iron core 17 is urged by the return spring 23 in a direction away from the fixed iron core 15 (upper side in FIG. 4). In the present embodiment, a protrusion 15d that protrudes toward the center and decreases the hole diameter is provided in the insertion hole 15c of the fixed iron core 15 over the entire circumference, and the lower surface 15f of the protrusion 15d is a return spring. 23 spring receiving portions.

  Further, an insertion hole 21 a through which the fixed iron core 15 is inserted is provided in the center portion of the yoke upper plate 21. When inserting the fixed iron core 15, the cylindrical portion 15 b of the fixed iron core 15 is inserted from the upper surface side of the yoke upper plate 21. At this time, a concave portion 21b having substantially the same diameter as the flange portion 15b of the fixed iron core 15 is provided at the approximate center of the upper surface of the yoke upper plate 21, and the flange portion 15b of the fixed iron core 15 is fitted into the concave portion 21b. The stopper is made.

  Further, a pressing plate 49 made of metal is provided on the upper surface side of the yoke upper plate 21, and left and right end portions are fixed to the upper surface of the yoke upper plate 21. And the convex part of the center of the pressing board 49 is provided so that the space which accommodates the flange part 15b of the fixed iron core 15 which protruded from the upper surface of the yoke upper board 21 may be formed. Further, in the present embodiment, an iron core rubber 18 made of a material having rubber elasticity (for example, synthetic rubber) is provided between the fixed iron core 15 and the holding plate 49, and vibration from the fixed iron core 15 is suppressed. It is not directly propagated to the plate 49. The iron core rubber 18 is formed in a disc shape, and an insertion hole 18a through which a shaft (driving shaft) 25 (described later) is inserted is provided at the center. Furthermore, in this embodiment, the iron core rubber 18 is fitted to the fixed iron core 15 so as to wrap the flange portion 15b.

  A flange portion 14 a protruding in the circumferential direction is formed on the opening side of the plunger cap 14, and the flange portion 14 a is fixed around the insertion hole 21 a on the lower surface of the yoke upper plate 21. And the lower end bottom part of the plunger cap 14 is penetrated by the bush 16 with which the insertion hole 19c of the bottom wall 19a was mounted | worn. At this time, the movable iron core 17 housed in the lower portion of the plunger cap 14 is magnetically joined to the peripheral portion of the bush 16.

  With this configuration, when the coil 13 is energized, the opposed surface of the fixed iron core 15 to the movable iron core 17 and the peripheral portion of the bush 16 on the bottom wall 19a have different polarities as a pair of magnetic pole portions. Thus, the movable iron core 17 is attracted to the fixed iron core 15 and moved to the contact position. On the other hand, when energization of the coil 13 is stopped, the movable iron core 17 is returned to the initial position by the return spring 23. The return spring 23 is inserted into the insertion hole 15 c of the fixed iron core 15, and the upper end is in contact with the lower surface 15 f of the protrusion 15 d and the lower surface is in contact with the upper surface of the movable iron core 17. Furthermore, in the present embodiment, a damper rubber 12 made of a material having rubber elasticity and having a diameter substantially the same as the outer diameter of the movable iron core 17 is provided at the bottom of the plunger cap 14.

  Further, a contact block 3 that opens and closes a contact in response to energization of the coil 13 is provided above the drive block 2.

  The contact block 3 includes a base 41 formed in a box shape whose lower surface is opened by a heat resistant material. The base 41 is provided with two insertion holes 41 a at the bottom, and a pair of fixed terminals 35 are inserted through the insertion holes 41 a with the lower flange 32 interposed therebetween. The fixed terminal 35 is formed in a cylindrical shape by a conductive material such as a copper-based material. A fixed contact 35a is formed at the lower end surface of the fixed terminal 35, a flange portion 35b protruding in the circumferential direction is formed at the upper end portion, and a convex portion 35c is provided at the center of the flange portion 35b. . The upper surface of the lower flange 32 and the flange portion 35 b of the fixed terminal 35 are hermetically joined by a silver solder 34, and the lower surface of the lower flange 32 and the upper surface of the base 41 are hermetically joined by a silver solder 36.

  The fixed terminal 35 is attached with a pair of main terminals 10 and 10 connected to an external load or the like. The main terminals 10 and 10 are formed in a flat plate shape using a conductive material, and are bent so that an inclined portion is formed at an intermediate portion in the front-rear direction. The front terminals of the main terminals 10 and 10 are formed with insertion holes 10a and 10a through which the convex portions 35c of the fixed terminal 35 are inserted, and the convex portions 35c through which the insertion holes 10a and 10a are inserted are subjected to spin caulking. The main terminals 10 and 10 are fixed to the fixed terminal 35.

  Further, a movable contact 29 is disposed in the base 41 so as to straddle between the pair of fixed contacts 35a, and the movable contact 29b is provided at a position facing the fixed contact 35a on the upper surface of the movable contact 29, respectively. It has been. An insertion hole 29 a through which one end of the shaft 25 that connects the movable contact 29 to the movable iron core 17 is inserted is provided at the center of the movable contact 29.

  The shaft 25 is made of a non-magnetic material, and has a round bar-like shaft body 25b that is long in the moving direction (vertical direction: drive axis direction) of the movable iron core 17 and a portion protruding upward from the movable contact 29. And a flange portion 25a formed so as to protrude in the circumferential direction.

  Furthermore, an insulating plate 37 is formed between the movable contact 29 and the pressing plate 49 by an insulating material and is formed so as to cover the pressing plate 49, and a contact pressure formed by a coil spring through which the shaft 25 is inserted. And a spring (biasing portion) 33. An insertion hole 37 a through which the shaft 25 is inserted is provided at the center of the insulating plate 37, and the movable contact 29 is biased upward (one side in the drive shaft direction) by the contact pressure spring 33. .

  Here, when the movable iron core 17 is in the initial position, the movable contact 29b and the fixed contact 35a are separated from each other, and when the movable iron core 17 is in the contact position, the movable contact 29b and the fixed contact 35a are in contact with each other. As described above, the positional relationship between the movable iron core 17 and the movable contact 29 is set. That is, when the coil 13 is not energized, the contact device 3 is turned off to insulate the fixed terminals 35 from each other, and when the coil 13 is energized, the contact block 3 is turned on to The fixed terminals 35 are electrically connected. The contact pressure between the movable contact 29b and the fixed contact 35a is secured by the contact pressure spring 33.

  By the way, when a current flows while the movable contact 29b of the movable contact 29 is in contact with the fixed contacts 35a and 35a, an electromagnetic repulsive force acts between the fixed contacts 35a and 35a and the movable contact 29 due to this current. To do. When an electromagnetic repulsive force acts between the fixed contacts 35a, 35a and the movable contact 29, the contact pressure decreases, the contact resistance increases, the Joule heat increases rapidly, or the contacts are separated to cause arc heat. May occur. For this reason, the movable contact 29b and the fixed contact 35a may be welded.

  Therefore, in this embodiment, the yoke 50 is provided so as to surround the movable contact 29. Specifically, movable contact is made between an upper yoke (first yoke) 51 disposed on the upper side of the movable contact 29 and a lower yoke (second yoke) 52 surrounding the lower and side portions of the movable contact 29. A yoke 50 surrounding the upper and lower surfaces and side surfaces of the child 29 is formed. In this way, the upper yoke 51 and the lower yoke 52 surround the movable contact 29 so that a magnetic circuit is formed between the upper yoke 51 and the lower yoke 52.

  By providing the upper yoke 51 and the lower yoke 52, when an electric current flows when the movable contact 29b and the fixed contacts 35a and 35a are in contact with each other, the upper yoke 51 and the lower yoke 52 are mutually connected based on the electric current. A magnetic force to be attracted is generated. Thus, the magnetic force attracting | sucking mutually generate | occur | produces, and the upper yoke 51 and the lower yoke 52 will mutually attract | suck. When the upper yoke 51 and the lower yoke 52 are attracted to each other, the movable contact 29 is pressed against the fixed contact 35a, and the operation of the movable contact 29 to be separated from the fixed contact 35a is restricted. In this way, by restricting the movement of the movable contact 29 from the fixed contact 35a, the movable contact 29b is attracted to the fixed contact 35a without repelling the fixed contact 35a. Is suppressed. As a result, contact welding due to arc generation can be suppressed.

  In the present embodiment, the upper yoke 51 is formed in a substantially rectangular plate shape, and the lower yoke 52 is substantially composed of a bottom wall portion 52a and side wall portions 52b formed so as to rise from both ends of the bottom wall portion 52a. It is formed in a U shape. At this time, as shown in FIG. 4A, the upper end surface of the side wall 52b of the lower yoke 52 is preferably brought into contact with the lower surface of the upper yoke 51. May not be brought into contact with the lower surface of the upper yoke 51.

  In the present embodiment, the movable contact 29 is urged upward by the contact pressure spring 33. Specifically, the contact pressure spring 33 has an upper end that contacts the lower surface 29d of the movable contact 29 and a lower end that contacts the upper surface 15e of the protrusion 15d. Thus, in the present embodiment, the contact pressure spring 33 biases the movable contact 29 upward without contacting the lower yoke 52 (yoke 50) in the drive shaft direction (without the yoke). With this configuration, the contact device 1 is downsized in the height direction (vertical direction: drive shaft direction). The upper surface 15 e of the protrusion 15 d is a spring receiving portion for the contact pressure spring 33.

  Further, the upper yoke 51, the lower yoke 52, and the pressing plate 49 are respectively formed with an insertion hole 51a, an insertion hole 52c, and an insertion hole 49a into which the shaft 25 is inserted.

  The movable contact 29 is attached to one end of the shaft 25 as follows.

  First, from the lower side, the movable iron core 17, the return spring 23, the yoke upper plate 21, the fixed iron core 15, the iron core rubber 18, the holding plate 49, the insulating plate 37, the contact pressure spring 33, the lower yoke 52, the movable contact. The child 29 and the upper yoke 51 are arranged in this order. At this time, the return spring 23 is inserted into the insertion hole 15 c of the fixed iron core 15 in which the protrusion 15 a is fitted into the insertion hole 21 a of the yoke upper plate 21 and the insertion hole 14 c of the plunger cap 14.

  Then, the main body 25b of the shaft 25 is inserted through the insertion holes 51a, 29a, 52c, 37a, 49a, 18a, 15c, 21a, the contact pressure spring 33, and the return spring 23 from the upper side of the upper yoke 51, and the movable iron The core 17 is inserted through the insertion hole 17a and connected. In this embodiment, the shaft 25 is connected to the movable iron core 17 by crushing the tip and riveting as shown in FIG. The shaft 25 may be connected to the movable iron core 17 by forming a thread groove on the other end of the shaft 25 and screwed to the movable iron core 17, or the shaft 25 may be connected to the movable iron core 17. The shaft 25 may be coupled to the movable iron core 17 by being press-fitted into the insertion hole 17a.

  Thus, the movable contact 29 is attached to one end of the shaft 25. In the present embodiment, an annular seat surface 51b is formed on the upper side of the upper yoke 51, and the flange 25a of the shaft 25 is housed in the seat surface 51b, thereby suppressing upward projection of the shaft 25. However, the shaft 25 is prevented from coming off. The shaft 25 may be fixed to the upper yoke 51 by laser welding or the like.

  Further, the insertion hole 15 c provided in the fixed iron core 15 is set to have an inner diameter larger than the outer diameter of the shaft 25 so that at least the shaft 25 does not contact the fixed iron core 15. With this configuration, the movable contact 29 moves in the vertical direction in conjunction with the movement of the movable iron core 17.

  Further, in the present embodiment, in order to suppress an arc generated between the movable contact 29b and the fixed contact 35a when the movable contact 29b is separated from the fixed contact 35a, gas is sealed in the base 41. Yes. As such a gas, it is possible to use a mixed gas mainly composed of hydrogen gas, which is most excellent in heat conduction in a temperature region where an arc is generated. In order to seal this gas, in this embodiment, the upper flange 40 which covers the clearance gap between the base 41 and the yoke upper board 21 is provided.

  Specifically, the base 41 has a top wall 41b in which a pair of insertion holes 41a are arranged side by side, and a square cylindrical wall portion 41c that rises from the periphery of the top wall 41b. It is formed in a hollow box shape in which the contact 29 side) is opened. And the base 41 is being fixed to the yoke upper board 21 via the upper flange 40 in the state which accommodated the movable contactor 29 inside the wall part 41c from the open lower side.

  In the present embodiment, the opening peripheral edge of the lower surface of the base 41 and the upper surface of the upper flange 40 are hermetically joined by the silver solder 38, and the lower surface of the upper flange 40 and the upper surface of the yoke upper plate 21 are hermetically joined by arc welding or the like. doing. Further, the lower surface of the yoke upper plate 21 and the flange portion 14a of the plunger cap 14 are hermetically joined by arc welding or the like. By doing so, a sealed space S in which a gas is sealed in the base 41 is formed.

  Furthermore, in parallel with the arc suppression method using gas, in this embodiment, arc suppression using a capsule yoke is also performed. The capsule yoke includes a magnetic member 30 and a pair of permanent magnets 31. The magnetic member 30 is formed in a substantially U shape by a magnetic material such as iron. The magnetic member 30 is integrally formed with a pair of side pieces 30a that oppose each other and a connecting piece 30b that connects the base end portions of both side pieces 30a.

  The permanent magnet 31 is attached to the both side pieces 30a of the magnetic member 30 so as to face the both side pieces 30a, respectively, and the permanent magnet 31 substantially contacts the base 41 with the moving direction of the movable contact 29a to the fixed contact 35a. Giving a direct magnetic field. As a result, the arc is stretched in a direction orthogonal to the moving direction of the movable contact 29 and is cooled by the gas sealed in the base 41, the arc voltage rapidly increases, and the arc voltage reduces the voltage between the contacts. When it exceeds, the arc is cut off. That is, in the electromagnetic relay 100 of this embodiment, an arc countermeasure is taken by magnetic blow by the capsule yoke and cooling by the gas sealed in the base 41. By doing so, the arc can be interrupted in a short time, and consumption of the fixed contact 35a and the movable contact 29b can be reduced.

  By the way, in the electromagnetic relay 100 of this embodiment, since the movable iron core 17 is guided in the movement direction (up-down direction) by the plunger cap 14, the position in the plane orthogonal to the movement direction is regulated. Therefore, the position of the shaft 25 connected to the movable iron core 17 in the plane orthogonal to the moving direction of the movable iron core 17 is also restricted. Furthermore, in this embodiment, the position of the shaft 25 in the plane orthogonal to the moving direction of the movable iron core 17 is also regulated by inserting the shaft 25 into the insertion hole 15 c in the fixed iron core 15. That is, the insertion hole 15 c of the fixed iron core 15 is formed so that the inner diameter of the portion where the protrusion 15 d is formed is approximately the same as the outer diameter of the shaft 25. That is, the diameter of the shaft 25 is set so as to move up and down while restricting the movement of the shaft 25 in the front and rear and right and left directions.

  With this configuration, the inclination of the shaft 25 with respect to the moving direction of the movable iron core 17 is restricted at the two locations of the plunger cap 14 and the protrusion 15 d of the fixed iron core 15. Therefore, even if the shaft 25 is inclined with respect to the moving direction of the movable iron core 17, the position of the shaft 25 in the plane perpendicular to the moving direction of the movable iron core 17 is the lower end of the movable iron core 17 and the fixed iron core 15. Therefore, the inclination of the shaft 25 is restricted. As a result, straightness of the shaft 25 is ensured, and the shaft 25 can be prevented from tilting.

  Next, the operation of the contact device 1 will be described.

  First, when the coil 13 is not energized, the elastic force of the return spring 23 overcomes the elastic force of the contact pressure spring 33, the movable iron core 17 moves away from the fixed iron core 15, and the movable contact 29b is moved. 1A and 1B separated from the fixed contact 35a.

  When the coil 13 is energized from this OFF state, the movable iron core 17 moves closer to the fixed iron core 15 by being attracted to the fixed iron core 15 against the elastic force of the return spring 23 by electromagnetic force. Along with the movement of the movable iron core 17 to the upper side (the fixed iron core 15 side), the upper yoke 51, the movable contact 29 and the lower yoke 52 attached to the shaft 25 and the shaft 25 are moved upward (the fixed contact 35a side). ) As a result, the movable contact 29b of the movable contact 29 comes into contact with the fixed contact 35a of the fixed terminal 35, and these contacts are electrically connected to each other, and the contact device 1 is turned on.

  The contact device 1 is attached to the case base 7 (case 5). Specifically, as shown in FIGS. 5 and 6, the internal unit block 90 having the contact block 3 and the shaft (drive shaft) 25 is connected to the case base 7 (case case) via the main terminal (first fixed portion) 10. The coil bobbin 11 around which the coil 13 is wound is attached to the case base 7 (case 5) via the coil terminal (second fixing portion) 20. In FIG. 5, the bush 16 is omitted for convenience.

  In the present embodiment, the inner unit block 90 is formed by the contact block 3 and the components of the drive block 2 excluding the coil 13 and the coil bobbin 11. Specifically, an inner unit block main body 91 is schematically constituted by a base 41, a holding plate 49, a yoke upper plate 21 and a plunger cap 14, and a fixed iron core 15 and a movable iron core 17 are provided in the inner unit block main body 91. The members constituting the drive block 2 such as the shaft 25 and the movable contact 29 are accommodated. The fixed terminal 35 is fixed to the inner unit block main body 91 so that the fixed contact 35a is disposed in the inner unit block main body 91. The fixed terminal 35 is exposed to the outside exposed from the inner unit block main body 91. A main terminal (first fixing portion) 10 for attaching the inner unit block 90 to the case base 7 (case 5) is attached.

  The inner block 90 includes a shaft portion 92 formed by the protruding portion 14b of the plunger cap 14 and the bush 16 fitted to the protruding portion 14b, the flange portion 14a of the plunger cap 14, and the yoke upper plate 21. And an upper flange portion 93 formed by the following. Further, the inner unit block 90 includes a lower flange portion 94 formed by the bottom wall 19 a of the yoke 19.

  And the coil bobbin 11 is arrange | positioned so that it may be located between the upper flange part 93 and the lower flange part 94 in the state which inserted the axial part 92 in the insertion hole 11a, as shown in FIG.

  The yoke 19 is fitted with the bush 16 in an annular insertion hole 19c formed in the bottom wall 19a, and a pair of side walls 19b, 19b rising from the periphery of the bottom wall 19a are fixed to the yoke upper plate 21. Thus, the inner block main body 91 is fixed. At this time, it is preferable to form the pair of side walls 19b and 19b rising from the periphery of the bottom wall 19a so as not to contact the coil bobbin 11. Thus, the coil bobbin 11 is prevented from coming off while being surrounded by the yoke 6 (the yoke 19 and the yoke upper plate 21). Therefore, in this embodiment, the inner unit block 90 is formed in a state where the coil bobbin 11 is attached so as not to be detached.

  The contact device 1 formed in this way is attached to the case base 7 (case 5) as described above. Then, by attaching the case cover 9 to the case base 7 so as to cover the contact device 1, the electromagnetic relay 100 in which the contact device 1 is mounted on the hollow box type case 5 is formed.

  By the way, the shaft 92 is press-fitted or fitted into the insertion hole 11a so that the inner block 90 and the coil bobbin 11 are attached to the case base 7 (case 5) (fixed state), and the coil bobbin 11 When the inner unit block 90 is brought into direct surface contact, vibration (vibration such as operation sound from the inner unit block 90) generated when the shaft 25 moves in the drive axis direction is easily transmitted to the coil bobbin 11, and the contact device. There is a risk that the vibration of 1 will increase.

  Therefore, in the present embodiment, it is possible to suppress the vibration of the contact device 1 from increasing.

  Specifically, with the internal unit block 90 and the coil bobbin 11 attached to the case base 7 (case 5), a gap 80 is formed between the coil bobbin 11 and the internal unit block 90, and the internal unit block 90 and the coil bobbin 11 Were brought into contact with each other at a linear or dotted contact portion.

  In the present embodiment, the outer surface 92a of the shaft portion 92 and the inner surface 11e of the winding drum portion 11d are opposed to each other in the direction intersecting the drive shaft direction via the gap 80. Further, the lower surface 93a of the upper flange portion 93 and the upper surface 11f of the upper flange portion 11c are opposed to each other in the drive shaft direction through the gap 80, and the upper surface 94a of the lower flange portion 94 and the lower surface 11g of the lower flange portion 11c. Are opposed to each other through the gap 80 in the drive shaft direction.

  Thus, in the present embodiment, the outer surface 92a of the shaft portion 92 and the inner surface 11e of the winding drum portion 11d correspond to opposing surfaces that face each other in the direction intersecting the drive shaft direction of the inner unit block 90 and the coil bobbin 11. doing. On the other hand, the lower surface 93a of the upper flange portion 93 and the upper surface 11f of the upper flange portion 11c, and the upper surface 94a of the lower flange portion 94 and the lower surface 11g of the lower flange portion 11c are connected to the inner block 90 and the coil bobbin 11. This corresponds to a facing surface facing the drive shaft direction.

  As shown in FIGS. 6 and 7, the inner surface 11e of the winding drum portion 11d extends in the drive shaft direction (vertical direction: left and right direction in FIG. 7) and protrudes toward the outer surface 92a of the shaft portion 92. The substantially triangular prism-shaped protrusion 81 is formed integrally with the coil bobbin 11. That is, the coil bobbin 11 that is at least one of the inner block 90 and the coil bobbin 11 includes the protruding portion 81.

  Thus, by forming the substantially triangular prism-shaped protrusion 81 on the inner surface 11e of the coil bobbin 11, the protrusion 81 of the coil bobbin 11 comes into linear contact with the outer surface 92a. That is, the inner unit block 90 and the coil bobbin 11 come into contact with each other at the linear contact portion 81a extending in the drive shaft direction. The inner block 90 and the coil bobbin 11 may be contacted by a linear contact portion extending in the circumferential direction, or may be contacted by a point-like contact portion. That is, the shape of the contact portion may be at least one of a linear shape and a dot shape. Moreover, the shape of the contact part 81a is not limited to a linear shape, and may be a shape including a curved line or a bent part.

  In the present embodiment, the contact portion 81a is formed between the opposing surfaces (between the outer surface 92a and the inner surface 11e) facing each other in the direction intersecting the drive axis direction of the inner unit block 90 and the coil bobbin 11. I have to.

  Furthermore, in this embodiment, between the lower surface 93a of the upper flange portion 93 and the upper surface 11f of the upper flange portion 11c, and between the upper surface 94a of the lower flange portion 94 and the lower surface 11g of the lower flange portion 11c. Prevents the protrusions from being formed. That is, the lower surface 93a of the upper flange portion 93 and the upper surface 11f of the upper flange portion 11c are arranged without contacting each other via the gap 80, and the upper surface 94a of the lower flange portion 94 and the lower surface of the lower flange portion 11c. 11g is arranged without contacting through the gap 80.

  In this way, the outer surface 92a of the shaft portion 92 and the inner surface 11e of the winding drum portion 11d are in contact with each other only via the substantially triangular prism-shaped protrusion 81.

  That is, in the present embodiment, the contact portion is only between the opposing surfaces of the inner unit block 90 and the coil bobbin 11 that are opposed to each other in the direction intersecting the drive axis direction (between the outer surface 92a and the inner surface 11e). 81a is formed.

  In the present embodiment, the substantially triangular prism-shaped projecting portions 81 are provided at three locations along the circumferential direction on one side (upper side: left side in FIG. 7) of the inner surface 11e of the winding drum portion 11d in the drive axis direction. Three portions are provided along the circumferential direction on the other side (lower side: right side in FIG. 7) of the inner surface 11e of the winding drum portion 11d in the drive axis direction. By doing so, the shaft portion 92 can be more stably supported by the substantially triangular prism-shaped projecting portion 81, and the shaft portion 92 is prevented from being displaced and directly contacting the inner surface 11e. it can. In particular, in the present embodiment, the shaft portion 92 is formed by the protruding portion 14b of the plunger cap 14 and the bush 16 fitted to the protruding portion 14b, and the upper substantially triangular prism-shaped protruding portion 81 is the protruding portion. 14 b is supported, and a lower substantially triangular prism-shaped protrusion 81 supports the bush 16. That is, each member constituting the shaft portion 92 is supported by the substantially triangular prism-shaped protrusion 81. Therefore, the shaft portion 92 can be supported more stably. Note that the position and number of the protrusions can be set as appropriate.

  As described above, in the present embodiment, with the inner unit block 90 and the coil bobbin 11 attached to the case base 7 (case 5), a gap 80 is formed between the coil bobbin 11 and the inner unit block 90, The inner block 90 and the coil bobbin 11 are brought into contact with each other through a linear contact portion 81a.

  Therefore, compared to the case where the inner unit block 90 and the coil bobbin 11 are brought into surface contact, vibrations (vibrations such as operating noise from the inner unit block 90) generated when the shaft 25 moves in the drive axis direction are transmitted to the coil bobbin 11. It becomes possible to suppress this. Thus, by suppressing the vibration of the coil bobbin 11, the vibration of the contact device 1 can be further suppressed, and the operating noise of the contact device 1 can be further reduced.

  Therefore, according to the present embodiment, it is possible to obtain the contact device 1 that can further suppress the vibration and the electromagnetic relay 100 on which the contact device 1 is mounted.

  In addition, according to the present embodiment, the contact portion 81 a includes the protruding portion 81 formed on at least one of the inner block 90 and the coil bobbin 11. By so doing, the contact area between the inner block 90 and the coil bobbin 11 can be reduced with a simpler configuration. Moreover, since the relative positioning of the coil bobbin 11 and the internal unit block 90 is made by the protrusion 81, there is an advantage that the assembly of the contact device 1 becomes easier.

  Further, in the present embodiment, the protruding portions 81 are provided only on the facing surfaces that face each other in the direction intersecting the drive axis direction. In other words, the inner block 90 and the coil bobbin 11 are not in contact with each other in the moving direction of the shaft (drive shaft) 25. Therefore, as compared with the case where the projecting portion 81 is provided on the facing surface facing in the drive axis direction, vibrations (vibrations such as operating noise from the inner unit block 90) generated when the shaft 25 moves in the drive axis direction are coil bobbins. 11 can be more reliably suppressed.

(Second Embodiment)
The electromagnetic relay 100 according to the present embodiment also includes the contact device 1 configured by integrally combining the drive block 2 positioned at the lower portion and the contact block 3 positioned at the upper portion. The contact device 1 is housed in a hollow box type case 5.

  Also in this embodiment, a gap 80 is formed between the coil bobbin 11 and the internal unit block 90 in a state where the internal unit block 90 and the coil bobbin 11 are attached to the case base 7 (case 5). And the coil bobbin 11 are brought into contact with each other at a linear or dotted contact portion.

  That is, a linear contact portion extending in the drive axis direction between opposing surfaces (between the outer surface 92a and the inner surface 11e) of the inner unit block 90 and the coil bobbin 11 facing each other in a direction intersecting the drive axis direction. 81a is formed.

  Here, in the present embodiment, as shown in FIGS. 8 and 9, between the opposing surfaces of the inner unit block 90 and the coil bobbin 11 facing in the drive axis direction (the lower surface 93 a of the upper flange portion 93 and the upper flange portion). A point-like or linear contact portion is also formed between the upper surface 11f of 11c and the upper surface 94a of the lower flange portion 94 and the lower surface 11g of the lower flange portion 11c.

  Specifically, a substantially conical shape projecting from the upper surface 11f of the upper flange portion 11c and the lower surface 11g of the lower flange portion 11c to the lower surface 93a side of the upper flange portion 93 and the upper surface 94a side of the lower flange portion 94, respectively. The projecting portion 81 is integrally formed. The lower surface 93a of the upper flange portion 93 and the upper surface 11f of the upper flange portion 11c abut only via the substantially conical protrusion 81, and the upper surface 94a of the lower flange portion 94 and the lower flange portion 11c. The lower surface 11 g of the first and second lower surfaces 11 a is in contact with only the substantially conical protrusion 81. Note that the protruding portion 81 may be formed only on one of the opposing surfaces of the internal unit block 90 and the coil bobbin 11 that are positioned in the vertical direction and that face each other in the drive axis direction.

  In this manner, the substantially conical protrusion 81 is formed on the upper surface 11f of the upper flange portion 11c and the lower surface 11g of the lower flange portion 11c, so that the substantially conical protrusion 81 becomes the upper flange portion 93. The lower surface 93a of the lower flange portion 94 and the upper surface 94a of the lower flange portion 94 come into contact with dots. That is, the inner unit block 90 and the coil bobbin 11 come into contact with each other at the point-like contact portion 81b. The inner block 90 and the coil bobbin 11 may be brought into contact with a linear contact portion extending in the circumferential direction, or may be brought into contact with a linear contact portion extending in the radial direction. Good.

  In the present embodiment, the substantially conical protrusions 81 are provided at three locations along the circumferential direction of the upper surface 11f of the upper flange portion 11c and the lower surface 11g of the lower flange portion 11c. By doing so, the upper flange portion 93 and the lower flange portion 94 are supported at three points, respectively, and can be supported more stably than the upper flange portion 93 and the lower flange portion 94.

  Also according to this embodiment described above, the same operations and effects as those of the first embodiment can be achieved.

  Further, according to the present embodiment, not only between the opposed surfaces of the inner unit block 90 and the coil bobbin 11 facing each other in the direction intersecting the driving axis direction, but also in the driving axis direction of the inner unit block 90 and the coil bobbin 11. The protruding portions 81 are also formed between the opposing surfaces. Therefore, relative positioning of the coil bobbin 11 and the internal unit block 90 in the drive axis direction is also performed by the protruding portion 81 formed between the opposed surfaces of the internal unit block 90 and the coil bobbin 11 facing each other in the drive axis direction. The Rukoto. As a result, the assembly of the contact device 1 is further facilitated.

(Third embodiment)
The electromagnetic relay 100 according to the present embodiment also includes the contact device 1 configured by integrally combining the drive block 2 positioned at the lower portion and the contact block 3 positioned at the upper portion. The contact device 1 is housed in a hollow box type case 5.

  Also in this embodiment, a gap 80 is formed between the coil bobbin 11 and the internal unit block 90 in a state where the internal unit block 90 and the coil bobbin 11 are attached to the case base 7 (case 5). And the coil bobbin 11 are brought into contact with each other at a linear or dotted contact portion.

  Here, in the present embodiment, as shown in FIGS. 10 and 11, the substantially triangular prism-shaped protrusion 81 formed between the outer surface 92 a and the inner surface 11 e is replaced with the inner block 90 and the coil bobbin 11. It is formed separately. Further, a substantially cone formed between the lower surface 93a of the upper flange portion 93 and the upper surface 11f of the upper flange portion 11c, and between the upper surface 94a of the lower flange portion 94 and the lower surface 11g of the lower flange portion 11c. The protruding portion 81 is also formed separately from the inner block 90 and the coil bobbin 11.

  At this time, the protrusion 81 is preferably formed of a material having a hardness lower than that of the coil bobbin 11. For example, when the coil bobbin 11 is formed of a resin, it is preferable to use a rubber such as silicon rubber, a potting material, a sponge, or the like as the material of the protruding portion 81 (a material having a lower hardness than the coil bobbin 11).

  Thus, by forming the projecting portion 81 with a material having a hardness lower than that of the coil bobbin 11, vibration (inner unit block 90) generated when the shaft 25 transmitted through the projecting portion 81 moves in the drive axis direction. (Vibrations such as operating noise from the above) can be reduced.

  Also according to the above-described embodiment, the same operations and effects as the first embodiment and the second embodiment can be achieved.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

  For example, in each of the above-described embodiments, the movable contact 29 is surrounded by the upper yoke 51 and the lower yoke 52, but only the lower yoke 52 may be provided.

  In the above embodiments, the contact pressure spring 33 is inserted through the insertion hole 52c of the lower yoke 52. However, the contact pressure spring 33 may be brought into contact with the lower yoke 52.

  Further, the flange portion 25a of the shaft 25 may also serve as the upper yoke.

  Also, the inner block 90 and the coil bobbin 11 can have various shapes, and the arrangement of the inner block 90 and the coil bobbin 11 can be changed as appropriate.

  Moreover, in each said embodiment, what formed the protrusion part 81 in the coil bobbin 11 was illustrated, However, The protrusion part 81 can also be formed in the internal unit block 90. FIG. It is also possible to form the protruding portions 81 on each of the coil bobbin 11 and the internal unit block 90. The protruding portion 81 may be formed integrally with the coil bobbin 11 or the inner unit block 90, or may be formed separately. Moreover, it is also possible to have a configuration in which the protrusions formed integrally and the protrusions formed separately are mixed.

  Further, in each of the above-described embodiments, the protrusion 81 is formed only on the facing surface that faces in the direction intersecting the drive axis direction, the facing surface that faces in the direction intersecting the drive axis direction, and the drive axis direction. Although the example in which the projecting portions 81 are provided on both of the opposing surfaces is illustrated, the projecting portions 81 may be provided only on the opposing surfaces facing in the drive axis direction.

  Further, the shape of the protruding portion, the position and number of the protruding portions, and the like can be set as appropriate.

  In addition, movable contacts, fixed terminals, and other detailed specifications (shape, size, layout, etc.) can be changed as appropriate.

1 Contact Device 2 Drive Block 3 Contact Block 7 Case Base (Case)
10 Main terminal (first fixed part)
11 Coil bobbin 13 Coil 20 Coil terminal (second fixing part)
25 Shaft (drive shaft)
DESCRIPTION OF SYMBOLS 29 Movable contact element 29b Movable contact point 35 Fixed terminal 35a Fixed contact point 80 Clearance 81 Protruding part 81a Linear contact part 81b Point-like contact part 90 Inner block 100 Electromagnetic relay

Claims (5)

A contact block having a fixed terminal in which a fixed contact is formed, and a movable contact in which a movable contact contacting and separating from the fixed contact is formed;
A drive block that has a drive shaft to which the movable contact is attached and a coil bobbin around which a coil is wound, and a drive block that drives the movable contact so that the movable contact comes in contact with and separates from the fixed contact;
With
An internal unit block having the contact block and the drive shaft is attached to the case via a first fixing part,
The coil bobbin is attached to the case via a second fixing portion;
With the inner block and the coil bobbin attached to the case, a gap is formed between the coil bobbin and the inner block, and the inner block and the coil bobbin are in contact with each other at a contact portion.
The contact device is characterized in that the shape of the contact portion is at least one of a line shape and a dot shape.   The contact device according to claim 1, wherein the contact portion includes a protruding portion formed on at least one of the inner block and the coil bobbin.   3. The contact device according to claim 1, wherein the contact portion is formed between opposing surfaces of the inner unit block and the coil bobbin facing each other in a direction intersecting with the drive shaft direction.   The contact device according to any one of claims 1 to 3, wherein the contact portion is formed between opposing surfaces of the inner unit block and the coil bobbin facing each other in the drive shaft direction.   An electromagnetic relay in which the contact device according to any one of claims 1 to 4 is mounted.

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