JP5140030B2 - Contact device - Google Patents

Description

  The present invention relates to a contact device mainly used for an electromagnetic relay.

  Conventionally, as shown in FIG. 4, an electromagnetic relay in which a contact block (contact device) 1 having a fixed contact 11 and a movable contact 12 and an electromagnet block 2 for opening and closing the contact block 1 are accommodated in a body 3 is provided. Provided (see, for example, Patent Document 1).

  The contact block 1 includes a pair of fixed contacts 11 each formed in a columnar shape, and a plate-shaped movable contact 12 that moves between a position that short-circuits between the fixed contacts 11 and a position that is separated from the fixed contacts 11. And.

  The electromagnet block 2 includes an exciting winding 25, a fixed iron core 21, a movable iron core 22 attracted to the fixed iron core 21 when the exciting coil 25 is energized, and a movable iron core 22 when the energization to the exciting coil 25 is stopped. And a return spring 29 for pulling the wire from the fixed iron core 21.

  A shaft 15 is coupled to the movable iron core 22, and a holder 17 having a pair of opposed pieces 17 e into which the movable contact 12 is inserted is coupled to the shaft 15. A contact pressure spring 16 is attached to the holder 17 so that one end abuts against one opposing piece 17e and the other end abuts against the movable contact 12 to press the movable contact 12 against the other opposing piece 17e.

  When the movable iron core 22 is attracted by the fixed iron core 21 and the holder 17 coupled to the shaft 15 moves to the fixed contact 11 side and the movable contact 12 contacts the fixed contact 11, the movable contact 12 contacts the movable contact 12. The opposing piece 17 e is separated from the movable contact 12, and the movable contact 12 is pressed against the fixed contact 11 by the contact pressure spring 16.

JP 11-238443 A

  By the way, when the contact device (contact block 1) having the above-described configuration is used for an application such as an electric vehicle or an industrial machine, the following problems occur. In this type of application, a large vibration is applied to the contact device, whereby an excitation force is applied to the movable contact 12 and the movable contact 12 may vibrate. When the movable contact 12 vibrates, an abnormal noise may occur between the movable contact 12 and the fixed contact 11.

  This invention is made | formed in view of the said reason, The objective is to provide the contact device which can reduce abnormal noise by reducing the vibration of a movable contact.

  According to the first aspect of the present invention, a fixed contact, a movable contact that is movable between a contact position that contacts the fixed contact and a spaced position that is separated from the fixed terminal, and a coil spring that fixes the movable contact at one end are fixed. A contact pressure spring biased toward the contact side, a holder for supporting the other end of the contact pressure spring, between the movable contact and one end of the contact pressure spring, and between the holder and the other end of the contact pressure spring. And an elastic member having rubber elasticity inserted into at least one of the above.

  According to a second aspect of the present invention, in the first aspect of the present invention, the elastic member is disposed between the other end of the contact pressure spring and the holder.

  According to a third aspect of the present invention, in the first aspect of the present invention, the elastic member is disposed between the movable contact and one end of the contact pressure spring.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the elastic member is brought into contact with one of an inner periphery and an outer periphery of the contact pressure spring. And a positioning projection for restricting the radial movement of the contact pressure spring is provided.

The invention of claim 5 is the invention described in any one of claims 1 to 4,
The elastic member includes a fitting means that fits into a fitting portion of the movable contact or the holder.

  In the configuration described in claim 1, an elastic member having rubber elasticity is disposed between at least one of the movable contact and one end of the contact pressure spring and between the holder and the other end of the contact pressure spring. Therefore, the vibration of the movable contact is transmitted to the elastic member directly or via a contact pressure spring, and the elastic member is deformed. As a result, the elastic member is deformed and vibration energy is consumed. As a result, the vibration of the movable contact There is an advantage that abnormal noise can be reduced.

  In the configuration described in claim 2, since the elastic member is disposed between the other end of the contact pressure spring and the holder and is connected to the movable contact via the contact pressure spring, the elastic member flows through the movable contact. The heat generated in the movable contact by the electric current is not directly transmitted to the elastic member, and the temperature of the elastic member is reduced. As a result, the heat restriction in the selection of the material of the elastic member is relaxed, and the material selection range is widened. There are advantages.

  In the configuration described in claim 3, since the elastic member is disposed between the movable contact and one end of the contact pressure spring, the elastic member is directly deformed by the movable contact to reduce vibration of the movable contact. There is an advantage that the effect that can be increased.

  The configuration described in claim 4 has an advantage that the contact pressure spring can be positioned by restricting the radial movement of the contact pressure spring by the elastic member.

  In the structure described in Claim 5, since the said elastic member is equipped with the fitting means fitted to the to-be-fitted part which a movable contact or the said holder comprises, an elastic member is attached to a movable contact or a holder. In addition, there is an advantage that the elastic member can be positioned.

FIG. 3 is a cross-sectional view showing a main part of the first embodiment. It is sectional drawing which shows the same as the above. FIG. 6 is a cross-sectional view showing a main part of a second embodiment. It is sectional drawing which shows a prior art example.

  Each embodiment described below shows an example in which the contact device of the present invention is used for an in-vehicle electromagnetic relay, but is not intended to limit the application of the present invention.

(Embodiment 1)
As shown in FIG. 2, the electromagnetic relay has a configuration in which a contact block (contact device) 1 and an electromagnet block 2 for opening and closing the contact block 1 are housed in a container 3.

  The contact block 1 has a pair of fixed contacts 11 each formed in a columnar shape, and a contact position where one surface in the thickness direction (upper surface in the drawing) contacts the bottom surface of the fixed contact 11 and short-circuits between the fixed terminals 11. And a movable contact 12 that is movable between a fixed position and a separated position. In the figure, a state in which the movable contact 12 is in the separated position is shown.

  The movable contact 12 is accommodated in a sealed container 13 whose one surface (lower surface in the drawing) is open. The sealing container 13 is made of, for example, a ceramic material. On the bottom surface of the sealing container 13, a pair of terminal holes 13 a are opened, in which each fixed contact 11 is inserted, and the fixed contact 11 is fixed to the peripheral wall by brazing and is closed by the fixed contact 11.

  A frame-like flange 14 is fixed to the end of the sealing container 13 on the opening side by brazing. The sealing container 13 and the flange 14 are for forming an airtight space, and this configuration will be described later.

  The movable contact 12 is provided with an insertion hole 12a through which a rod-like shaft 15 for displacing the movable contact 12 by the electromagnet block 2 is inserted. In the following, description will be made assuming that the shaft 15 is formed in a round bar shape, but the shaft 15 can also be formed in a square bar shape.

  A hooking piece 15 a that abuts on the surface (upper surface in the drawing) of the movable contact 12 on the fixed contact 11 side is provided projecting in the radial direction at the end portion (upper end in the drawing) of the shaft 15. In order to press the movable contact 12 against the hooking piece 15a, a contact pressure spring 16 made of a coil spring is disposed in such a manner that the shaft 15 is inserted and one end (the upper end in the figure) is in contact with the movable contact 12. . In order to support the other end of the contact pressure spring 16, a plate-like holder 17 having a holder hole 17 a through which the shaft 15 is inserted is disposed so as to be attached to the electromagnet block 2 (electromagnet block). The structure attached to 2 will be described later).

  The holder 17 is provided with a circular circular protrusion 17b surrounding the outside of the other end (lower end in the figure) of the contact pressure spring 16, while the movable contact 12 is provided with one end of the contact pressure spring 16. A positioning recess 12b into which (the upper end portion in the figure) fits is recessed. The contact pressure spring 16 urges the movable contact 12 toward the fixed contact 11, and presses the movable contact 12 against the hooking piece 15a when the movable contact 12 is in a separated position away from the fixed contact 11. . Further, when the movable contact 12 is in a contact position where the movable contact 12 contacts the fixed contact 11, the contact pressure spring 16 presses the movable contact 12 against the fixed contact 11, and the contact between the movable contact 12 and the fixed contact 11 is achieved. Ensure pressure.

The electromagnet block 2 includes a cylindrical fixed iron core 21 and a movable iron core 22 having substantially the same diameter.
The fixed iron core 21 and the movable iron core 22 are inserted into a bottomed cylindrical enclosing cylinder 23 so that the fixed iron core 21 is on the opening side, and the enclosing cylinder 23 is inserted into a hollow cylindrical bobbin 24.
An excitation winding 25 is wound around the bobbin 24. The bobbin 24 includes a first yoke plate 26 having a rectangular plate shape through which a mounting hole 26 a through which the fixed iron core 21 is inserted, and a second yoke plate formed in a U-shaped cross section and coupled to the first yoke plate 26. 27. When the excitation winding 25 is energized, a magnetic path is formed by the first yoke plate 26, the second yoke plate 27, the fixed iron core 21, and the movable iron core 22, and the movable iron core 22 is attracted to the fixed iron core 21.

  In order to couple the first yoke plate 26 and the fixed iron core 21, a fixing protrusion 21 a that the first yoke plate 26 contacts in the axial direction of the fixed iron core 21 protrudes in the radial direction at the end of the fixed iron core 21. The cap 28 is fixed to the first yoke plate 26 so as to sandwich the fixing projection 21 a in the axial direction of the fixed core 21 together with the first yoke plate 26.

  The first yoke plate 26 is joined to the end of the enclosing cylinder 23 on the opening side and the flange 14 by brazing. An airtight space is formed by the sealing cylinder 23, the first yoke plate 26, the flange 14, and the sealing container 13.

  An engaging projection 28a for attaching the holder 17 protrudes from the cap 28 that couples the first yoke plate 26 and the fixed iron core 21. On the other hand, the holder 17 is engaged with the engaging projection 28a. Engaging recesses 17c to be mated are provided, and the holder 17 is attached to the electromagnet block 2 at the cap 28.

  The cap 28 has a shaft hole 28b through which the shaft 15 is inserted. The diameter of the shaft hole 28b is set to be approximately the same as the diameter of the shaft 15, and movement of the shaft 15 in the radial direction is restricted by the shaft hole 28b.

  The fixed iron core 21 is also provided with a shaft hole 21 b through which the shaft 15 is inserted, and the shaft 15 is coupled to the movable iron core 22. The diameter of the shaft hole 21b is set to be larger than the diameter of the shaft 15, and a return spring 29 made of a coil spring is in contact with the cap 28 in the gap between the shaft 15 and the peripheral wall of the shaft hole 21b, and the other end is It is inserted so as to abut on the movable iron core 22.

  Next, the operation will be described. When the exciting winding 25 is energized, the movable iron core 22 is attracted to the fixed iron core 21, the return spring 29 contracts, the shaft 15 moves to the fixed contact 11 side, and the movable contact 12 contacts the fixed contact 11, and the contact Is closed. When energization to the excitation winding 25 is stopped, the movable iron core 22 is separated from the fixed iron core 21 by the elastic force of the return spring 29, the movable contact 12 is separated from the fixed contact 11, and the contact is opened.

  By the way, in this embodiment, as shown in FIG. 1, an elastic member 40 having rubber elasticity is inserted between the other end portion (lower end portion in the drawing) of the contact pressure spring 16 and the holder 17. The elastic member 40 is formed in a plate shape (for example, a disk shape or a rectangular plate shape). An insertion hole 44 through which the shaft 15 is inserted passes through the center of the elastic member 40, and the contact pressure spring 16 is positioned at the periphery of the insertion hole 44 together with the circular protrusion 17 b provided in the holder 17. An annular positioning protrusion 43 is protruded. The positioning projection 43 has an outer diameter set to be approximately the same as the inner diameter of the contact pressure spring 16. The elastic member 40 is placed on one surface (the upper surface in the drawing) of the holder 17, and the other end (the lower end in the drawing) of the contact pressure spring 16 contacts the flat plate-shaped vibration receiving portion 41 around the positioning projection 43. The protrusion 43 is inserted into the other end of the contact pressure spring 16. The positioning protrusion 43 contacts the inner periphery of the contact pressure spring 16 to limit the radial movement of the contact pressure spring 16 to position the contact pressure spring 16. The positioning protrusion 43 can also be constituted by a plurality of protrusions that contact the inner periphery of the contact pressure spring 16. Further, the contact pressure spring 16 can be positioned by providing a positioning protrusion so as to contact the outer periphery of the contact pressure spring 16 without providing the holder 17 with the circular protrusion 17b.

  On the surface of the positioning projection 43 facing the holder 17, a fitting recess 42 is provided as a fitting means for attaching the elastic member 40 to the holder 17. On the other hand, the holder 17 is provided with a fitting projection 17d as a fitted portion that fits into the fitting recess 42. The fitting recess 42 and the fitting protrusion 17d are concavo-convexly fitted in the extending and contracting direction of the contact pressure spring 16, and the elastic member 40 is positioned with respect to the holder 17 and held by the holder 17.

  As described above, in the vibration receiving portion 41 of the elastic member 40, the contact pressure spring 16 abuts on one surface in the thickness direction and one surface of the holder 17 abuts on the other surface. The vibration of the child 12 is transmitted through the contact pressure spring 16 to be deformed, and the elastic member 40 is consumed after accumulating the vibration energy of the movable contact 12 due to the deformation. As a result, the vibration of the movable contact 12 is reduced. Thus, abnormal noise generated by the movable contact 12 is reduced.

  For the elastic member 40, it is desirable to select a material having a high loss tangent (tan δ). For example, silicon rubber is used. Further, in order to increase the vibration energy consumed by the elastic member 40, it is desirable to increase the thickness dimension of the vibration receiving portion 41.

  In this embodiment, the elastic member 40 is provided between the contact pressure spring 16 and the holder 17, and the elastic member 40 is connected to the movable contact 12 via the contact pressure spring 16. The heat generated in the movable contact 12 by the flowing current is not easily transmitted to the elastic member 40, and the temperature rise of the elastic member 40 is suppressed. As a result, the restriction due to heat in the selection of the material of the elastic member 40 is relaxed, and the elastic member 40 The selection range of materials becomes wider.

(Embodiment 2)
In the first embodiment, the configuration in which the elastic member 40 is disposed between the contact pressure spring 16 and the holder 17 has been described. However, in this embodiment, as shown in FIG. A configuration in which an elastic member 40 ′ is disposed between the contact 12 and the contact 12 will be described.

  The elastic member 40 ′ is formed in a plate shape and is fitted into the holding recess 12 b of the movable contact 12, and one end (upper end in the drawing) of the contact pressure spring 16 contacts. In the present embodiment, the elastic member 40 ′ is shown as an example of a plate shape. However, as in the first embodiment, the elastic member 40 ′ has a recess having the same configuration as the fitting recess 42 (see FIG. 2). It is also possible to provide the movable contact 12 with a protrusion having the same configuration as the fitting protrusion 17d (see FIG. 2) so that the elastic member 40 ′ is held by the movable contact 12.

  Further, the contact spring 16 can be positioned by providing a protrusion having the same structure as the positioning protrusion 43 (see FIG. 2) on the elastic member 40 '.

  In the present embodiment, since the elastic member 40 ′ is disposed between the movable contact 12 and the contact pressure spring 16 and the movable contact 12 directly contacts the elastic member 40 ′, the vibration of the movable contact 12 is caused by the elastic member. The effect of reducing the vibration of the movable contact 12 by being transmitted directly to 40 ′ can be enhanced as compared with the first embodiment.

  Other configurations and operations are the same as those of the first embodiment.

1 Contact block (contact device)
2 Electromagnet block 11 Fixed contact 12 Movable contact 16 Contact pressure spring 17 Holder 17d Fitting protrusion (fitting part)
40 Elastic member 42 Fitting recess (fitting part)
43 Positioning protrusion

Claims (5)

  A fixed contact, a movable contact that is movable between a contact position that contacts the fixed contact and a spaced position that is separated from the fixed terminal, and a contact that is composed of a coil spring and biases the movable contact toward the fixed contact at one end. The pressure spring, a holder that supports the other end of the contact pressure spring, and at least one of the movable contact and one end of the contact pressure spring and between the holder and the other end of the contact pressure spring are inserted. A contact device comprising an elastic member having rubber elasticity.   The contact device according to claim 1, wherein the elastic member is disposed between the other end of the contact pressure spring and the holder.   The contact device according to claim 1, wherein the elastic member is disposed between the movable contact and one end of the contact pressure spring.   The elastic member is provided with a positioning protrusion for restricting the radial movement of the contact pressure spring by contacting either the inner periphery or the outer periphery of the contact pressure spring. The contact device according to any one of claims 1 to 3.   5. The contact device according to claim 1, wherein the elastic member includes a fitting unit that fits into a fitted portion of the movable contactor or the holder. .

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