The present invention relates to an electromagnetic relay, in particular to an attachment structure of a card for driving a contact mechanism portion.
Conventionally, as an electromagnetic relay, for example, there is one wherein, based on excitation and non-excitation of an electromagnetic assembly X, a movable contact spring 9 is rotated by a card 12 that makes a reciprocating movement by rotation of an armature 7 to open/close contacts (refer to Patent Document 1).
In the above electromagnetic relay, engagement portions 12a, 12b protruding sideways from one end side of the card 12 are engaged with notch portions 7b, 7c of the armature 7 so as to be supported.
However, in the above electromagnetic relay, as shown in
In view of the above problem, an object of the present invention is to provide an electromagnetic relay whose operation characteristics are easily adjusted and in which variations in the operation characteristics are small.
In order to solve the above problem, in an electromagnetic relay of the present invention, one end portion of a frame-shaped card is engaged with a movable iron piece that is rotated by being attracted to and separated from a magnetic pole portion of an iron core based on excitation and non-excitation of an electromagnetic block formed by winding a coil around the iron core, and a contact mechanism portion is driven by the other end portion of the frame-shaped card that makes a reciprocating movement so as to open/close contacts,
According to the present invention, since the adjustment opening is provided between the protrusions provided on the same shaft center inside of the card, by inserting a thickness gauge into the adjustment opening, adjustment work of the operation characteristics is facilitated and an electromagnetic relay having the good operation characteristics is obtained.
In another electromagnetic relay of the present invention, one end portion of a frame-shaped card is engaged with a movable iron piece that is rotated by being attracted to and separated from a magnetic pole portion of an iron core based on excitation and non-excitation of an electromagnetic block formed by winding a coil around the iron core, and a contact mechanism portion is driven by the other end portion of the frame-shaped card that makes a reciprocating movement so as to open/close contacts,
According to the present invention, in addition to the above effect, by the slit provided in the center of the one end portion of the card, the one end side of the card is easily elastically deformed, so that assembling of the movable iron piece is facilitated.
In an embodiment of the present invention, an upper end edge portion of the movable iron piece may be provided with an engagement pawl engaged with the one end portion of the frame-shaped card.
According to the present embodiment, the movable iron piece is engaged with the frame-shaped card so as to prevent the frame-shaped card from coming off, so that reliability is improved.
In another embodiment of the present invention, intermediate portions on both opposite sides of the frame-shaped card may be bridged over by a connection portion.
According to the present embodiment rigidity of the frame-shaped card is improved so that it is hardly deformed. Therefore, there is an effect that operation characteristics are improved.
Embodiments of the present invention will be described in accordance with the accompanying drawings of
A first embodiment is generally constructed of a base 10, an electromagnetic block 20, a movable iron piece 50, a contact mechanism portion 70, a card 80 and a case 90 as shown in
The base 10 is obtained by integrally molding at its upper surface central portion a cylindrical-shaped cover 11 provided with a partition wall at its back side. The base 10 has a structure that allows the electromagnetic block 20 described below to slide from one side so that it can be assembled thereto. Further, both upper surface side edge portions on the opening side of the cylindrical-shaped cover 11 of the base 10 are respectively provided with engagement pawls 12, 12 protruding therefrom for being engaged with both upper surface side edge portions of a yoke 40 described below.
In the electromagnetic block 20, a coil 21 is wound around a body portion 23 of a spool 22 having flange portions 24, 25 at its both ends. Then, an iron core 30 having a generally T-shape in cross section is inserted into a through hole 23a in the body portion 23, one end portion thereof that protrudes serves as a magnetic pole portion 31, and the other end portion 32 that protrudes is fixed by caulking to a vertical portion 41 of the yoke 40 described below.
Both side edge portions of the one side flange portion 24 are respectively provided with pedestal portions 26, 26 protruding therefrom, and lower side edge portions of the pedestal portions 26, 26 are connected with a receiving portion 27. An insertion opening 26a through which a horizontal portion 44 of the yoke 40 can be inserted is provided between the receiving portion 27 and the flange portion 24. Further, coil terminals 35, 35 are respectively press-fitted into the pedestal portions 26, 26, and lead-out wires of the coil 21 are tied and soldered to upper end portions of the coil terminals 35 that protrude therefrom.
The yoke 40 is made of a magnetic material generally having an L-shape. A vertical portion 41 thereof is formed with a caulking hole, and a shallow groove 45 having an arc shape in cross section along an outer peripheral surface of the coil 21 is formed in the upper surface center of the horizontal portion 44 along a lengthwise direction. Further, a basal portion of the vertical portion 41 is formed with a thin neck portion 43 having a narrow width. Therefore, there is an advantage that bending work is facilitated.
Then, the horizontal portion 44 of the yoke 40 is inserted through the insertion opening 26a, and the other end portion 32 of the iron core 30 is caulk-fixed to the caulking hole 42, whereby the yoke 40 is integrated with the spool 22. Therefore, a tip end surface of the horizontal portion 44 of the yoke 40 is exposed from the insertion opening 26a (
As shown in
As shown in
Thereafter, after the engagement protrusion 51 of the movable iron piece 50 is caulk-fixed to the caulking hole 66a, the horizontal portion 61 of the hinge spring 60 is press-fitted into a gap between a bottom surface of the horizontal portion 44 of the yoke 40 and the receiving portion 27 with the assembling tongue piece 64 of the hinge spring 60 being held, and each positioning rib 62 is press-fitted into the gap 26a between a side surface of the yoke 40 and each pedestal portion 26. As a result, the positioning rib 62 that comes out from the gap 26a between the side surface of the yoke 40 and the pedestal portion 26 is engaged with a notched step portion 45a of the yoke 40, and the elastic pawl portion 62a is locked to an edge portion of the pedestal portion 26, so that the movable iron piece 50 is prevented from coming off. Thereby, the movable iron piece 50 is rotatably supported by the hinge spring 60, and the electromagnetic block 20 is completed.
In the present embodiment, the positioning ribs 62 and the gap 26a can be visually checked at the same time and thus there is an advantage that assembling work is facilitated.
The contact mechanism portion 70 is disposed on one side of the cylindrical-shaped cover 11 of the base 10, and consists of normally-closed, normally open fixed contact terminals 71, 73 and a movable contact terminal 75. The normally-closed, the normally open fixed contact terminals 71, 73 are obtained by continuously integrally molding press-fitting portions 71a, 73a and terminal portions 71b, 73b, respectively, at lower sides of fixed contacts 72, 74. In particular, the press-fitting portion 71a of the normally-closed side fixed contact terminal 71 is bent generally at right angles.
In the movable contact terminal 75, a connection portion of a movable contact piece 76 formed by being punched in a generally J-shape 76a is bent generally at right angles to form a rib portion 76a serving as a rotational fulcrum, and a movable contact 77 is caulk-fixed to a free end portion thereof. Further, right above the movable contact 77, a protrusion 82a of a card 80 described below is inserted, and an engagement opening 76b serving as a point of action is formed. Therefore, a shaft center of the engagement opening 76b and a shaft center of the movable contact 77 are located on the same vertical surface.
In the movable contact terminal 75, a press-fitting portion 75a located at a basal portion of the movable contact piece 76 is press-fitted sideways into a slit 13, which is provided in one side edge portion of the base 10, whereby a terminal portion 75b is protruded from a bottom surface of the base 10. Further, the press-fitting portions 71a, 73a of the normally-closed, normally open fixed contact terminals 71, 73 are press-fitted sideways into a pair of slits 14, 15, respectively, which are provided in an edge portion on the opposite side of the slit 13 for the movable contact terminal. Thereby, the terminal portions 71b, 73b are protruded from the bottom surface of the base 10, and the movable contact 77 and the fixed contacts 72, 74 are opposite to each other so that they can be respectively contacted with and separated from each other.
Subsequently, both the side edge portions of the horizontal portion 44 of the yoke 40 are inserted in a sliding manner so as to be engaged with the pair of the engagement pawls 12, 12, and a part of the electromagnetic block 20 is inserted into the cylindrical-shaped cover 11, whereby the base 10 and the electromagnetic block 20 are integrated with each other.
The card 80 is for connecting the movable iron piece 50 and the movable contact terminal 75. It has a rectangular frame shape in plan view, and its middle portion is provided with a connection portion 81. In particular, frame portions in a lengthwise direction each have a generally triangular shape in cross section (refer to
Then, while the engagement projection 82a is inserted through the engagement opening 76b, both side edge portions of the upper side portion 52 of the movable iron piece 50 are held by one end portion of the card 80 and the pair of the protrusions 84, 84, and the engagement pawl 53 of the movable iron piece 50 is engaged with the engagement recess 83 to prevent the card 80 from coming off.
The case 90 has a box shape capable of covering the base 10. The case is assembled to the base 10 to which internal components are assembled, whereby an assembling work is completed.
Next, an operation method of the electromagnetic relay will be described.
That is, if a voltage is not applied to the coil 21 of the electromagnetic block 20, the card 80 is urged to the movable iron piece 50 side by a spring force of the movable contact piece 76. Therefore, the movable contact 77 is in contact with the normally-closed fixed contact 72, and separated from the normally open fixed contact 74.
Then, by applying a voltage to the coil 21 of the electromagnetic block 20, the magnetic pole portion 31 of the iron core 30 attracts the movable iron piece 50. Therefore, the movable iron piece 50 is rotated against the spring force of the movable contact piece 76, whereby the card 80 is moved in a sliding manner in a horizontal direction to press the movable contact piece 76, so that the movable contact 77 is separated from the fixed contact 72, brought into contact with the fixed contact 74 and then the movable iron piece 50 is attracted to the magnetic pole portion 31.
Then, if the voltage application to the coil 21 is stopped, the card 80 is pushed back by the spring force of the movable contact piece 76, and the movable iron piece 50 is separated from the magnetic pole portion 31. Thereafter, the movable contact 77 is separated from the fixed contact 74 and brought into contact with the fixed contact 72 to return to the original state.
If operation characteristics of the electromagnetic relay of the present embodiment are adjusted, as shown in
A second embodiment is a case where a press fitting protrusion 67 is provided by protruding work in place of the press-fitting elastic tongue piece provided at the horizontal portion 61 of the hinge spring 60 as shown in
A third embodiment is a case where the center of one end portion of the card 80 is provided with a slit 83a as shown in
The electromagnetic relay of the present invention can be applied not only to the above electromagnetic relays but also to other electromagnetic relays.
Number | Date | Country | Kind |
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2006-098264 | Mar 2006 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2007/056859 | 3/29/2007 | WO | 00 | 9/23/2008 |