JP7647198B2 - Electromagnetic Relay - Google Patents

Description

The present invention relates to an electromagnetic relay.

Conventionally, electromagnetic relays that open and close electric circuits are known. For example, the electromagnetic relay of Patent Document 1 includes a fixed terminal including a fixed contact, a movable contact piece including a movable contact, an electromagnet, an armature (movable iron piece) that is attracted to the electromagnet, and a leaf spring that separates the armature from the electromagnet when the generation of magnetic force by the electromagnet is stopped. The attraction of the armature by the electromagnet moves the movable contact piece toward the fixed terminal, and the movable contact comes into contact with the fixed contact.

JP 2014-139898 A

In the configuration shown in Patent Document 1, it is possible to provide a stopper member that restricts the movement of the movable iron piece by the leaf spring in order to prevent overshooting, etc., but there is a risk of deformation when an impact load is applied.

The present invention aims to provide an electromagnetic relay that can suppress deformation of the stopper member that regulates the movable iron piece.

An electromagnetic relay according to one aspect of the present invention includes a fixed terminal, a movable part, a movable iron piece, a coil, a bobbin, a biasing part, and a stopper member. The fixed terminal has a fixed contact. The movable part has a movable contact piece including a movable contact facing the fixed contact, and is movable in a contact direction in which the movable contact approaches the fixed terminal and in a separation direction in which the movable contact separates from the fixed contact. The movable iron piece is movable in a pressing direction in which the movable part is pressed in the contact direction and in a release direction in which the pressure on the movable part is released. The coil generates a magnetic force that moves the movable iron piece in the pressing direction. The bobbin has the coil disposed on the outside. The stopper member restricts the movement of the movable iron piece in the release direction. The bobbin has a fixed part and a first restricting part. The fixed part fixes the stopper member. The first restricting part restricts deformation of the stopper member due to collision with the movable iron piece.

In this way, by providing the first restricting portion, deformation of the stopper member is restricted when an impact load from the movable iron piece is applied to the stopper member, thereby reducing deformation of the stopper member.

The stopper member may have a stopper portion, a fixed portion, and a connecting portion. The stopper portion may be capable of contacting the movable iron piece. The fixed portion may be fixed to the fixing portion. The connecting portion may connect one end of the fixed portion to one end of the stopper portion. The stopper portion and the fixed portion may be formed parallel to each other and extending in the same direction from the connecting portion.

In this case, the stopper member is bent, so that it has elasticity and can absorb the impact caused by the collision of the movable iron piece.

The fixed part may be disposed on the pressing direction side of the stopper part. The fixed part may have an insertion hole into which the fixed part is inserted. The connection part may be disposed on the opposite side of the fixed part from the movable iron piece.

In this case, the stopper member can be fixed to the fixed part by inserting the fixed part into an insertion hole formed in the fixed part.

The first restricting portion is disposed opposite the stopper portion with a predetermined gap therebetween, at least when the movable iron piece is not in contact with the stopper portion.

In this case, the deformation of the stopper portion that bends in the opposite direction to the movable iron piece due to the collision of the movable iron piece can be restricted by the first restricting portion.

The stopper portion may be disposed on the surface facing the movable iron piece and may have a protrusion that can come into contact with the movable iron piece.

In this case, the contact position of the stopper member with the movable iron piece can be stabilized.

The bobbin may further have a second restricting portion that restricts the tip of the stopper portion. The second restricting portion may be disposed opposite the first restricting portion across the movable iron piece. The second restricting portion may be disposed opposite the stopper portion with a predetermined gap therebetween, at least when the movable iron piece is not in contact.

In this case, the movement of the tip of the stopper member caused by the collision of the movable iron piece is restricted by the second restricting portion, so deformation of the stopper member can be further suppressed.

The stopper portion may have a recess formed between the portion that contacts the iron piece and one end.

In this case, the restricting position of the movable iron piece can be adjusted by bending the tip side of the stopper part using the recess as a reference.

The device may further include a case. The case may cover the fixed terminal, the movable iron piece, the coil, the bobbin, the biasing portion, and the stopper member. The connection portion may have a bulging portion that protrudes in the opposite direction to the extension direction of the stopper portion and the fixed portion and has an elastic bulging portion. The bulging portion may contact a side wall formed on the inside of the case.

In this case, the stopper member can be prevented from jumping out of the bobbin.

The present invention provides an electromagnetic relay that can suppress deformation of the stopper member that regulates the movable iron piece.

FIG. FIG. 2 is a perspective view showing the internal structure of the electromagnetic relay. FIG. 2 is a front view of the internal structure of the electromagnetic relay. FIG. 2 is a front perspective view of the contact device and the drive device. 5 is a cross-sectional view taken along the line AA in FIG. 4 . 1A is a perspective view of a stopper member as viewed from above, and FIG. 1B is a perspective view of the stopper member as viewed from above. 1A is a plan view of the stopper member as viewed from above, FIG. 1B is a side view of the stopper member as viewed from the right, and FIG. 1C is a front view of the stopper member as viewed from the front. 13 is a cross-sectional view showing a state in which another example of a stopper member is placed on a placement portion of a bobbin. FIG. FIG. 11 is a perspective view of another example of a stopper member as viewed from above.

Below, an embodiment of an electromagnetic relay according to one aspect of the present invention will be described with reference to the drawings. In each drawing, the direction indicated by Z2 is the upward direction, the direction indicated by Z1 is the downward direction, the direction indicated by X1 is the leftward direction, the direction indicated by X2 is the rightward direction, the direction indicated by Y1 is the forward direction, and the direction indicated by Y2 is the backward direction. Note that these directions are defined for the convenience of explanation, and do not limit the arrangement direction of the electromagnetic relay.

<Configuration>
(Overview of electromagnetic relay 1)
Fig. 1 is a perspective view of an electromagnetic relay 1. Fig. 2 is a perspective view showing a state in which a case is removed from the electromagnetic relay 1. Fig. 3 is a side view of Fig. 2.

As shown in Figures 1 to 3, the electromagnetic relay 1 includes a base 2, a case 10, a contact device 3, a drive device 4, and a magnet unit 5.

The base 2 is made of an insulating material such as resin. The base 2 supports the contact device 3 and the drive device 4. The contact device 3 and the drive device 4 are covered by a case 10 attached to the base 2. FIG. 4 is a perspective view of the contact device 3 and the drive device 4 as viewed from the front. The contact device 3 is provided with two first and second fixed terminals 6 and 7, and a movable contact piece 90 that can connect the first and second fixed terminals 6 and 7. The drive device 4 moves the movable contact piece 90, and causes the movable contact piece 90 to contact the first and second fixed terminals 6 and 7 or to separate from the first and second fixed terminals 6 and 7. The magnet section 5 extends the arc generated by the separation of the contacts by the Lorentz force.

(Contact device 3)
4, the contact device 3 has a first fixed terminal 6 (an example of a fixed terminal), a second fixed terminal 7 (an example of a fixed terminal), a return spring 8, and a movable part 9. The first fixed terminal 6 and the second fixed terminal 7 are fixed to the base 2. The movable part 9 has a movable contact piece 90. The first fixed terminal 6, the second fixed terminal 7, and the movable contact piece 90 are plate-shaped terminals and are made of a conductive material such as copper.

The movable contact piece 90 can contact the first fixed terminal 6 and the second fixed terminal 7 or can be separated from the first fixed terminal 6 and the second fixed terminal 7. The movable part 9 moves the movable contact piece 90 between a contact position where it contacts the first fixed terminal 6 and the second fixed terminal 7 and a separation position where it is separated from the first fixed terminal 6 and the second fixed terminal 7. The movable part 9 is moved from the separation position to the contact position by the drive device 4. The return spring 8 biases the movable part 9 to the separation position.

(First fixed terminal 6, second fixed terminal 7)
2 and 3, the first fixed terminal 6 has a U-shaped bent shape when viewed from the front-rear direction. The first fixed terminal 6 is disposed on the base 2.

As shown in FIG. 3, the first fixed terminal 6 has a contact support portion 61, a first fixed contact 62, and a pair of a first external connection portion 63 and a second external connection portion 64.

The contact support portion 61 has a flat surface perpendicular to the up-down direction. The first fixed contact 62 is supported by the contact support portion 61. The first fixed contact 62 protrudes upward from the contact support portion 61. The first fixed contact 62 may be integral with the contact support portion 61, the first external connection portion 63, and the second external connection portion 64.

The first external connection part 63 is bent from the right end of the contact support part 61 in the left-right direction and extends downward relative to the contact support part 61. As shown in FIG. 4, the width of the tip part 631 of the first external connection part 63 is narrowed, and it protrudes downward from the base 2.

The second external connection part 64 is bent from the left end of the contact support part 61 in the left-right direction and extends downward relative to the contact support part 61. As shown in FIG. 4, the second external connection part 64 has a narrow tip part 641 and protrudes downward from the base 2.

The first external connection part 63 and the second external connection part 64 are arranged opposite each other in the left-right direction. The tip parts 631, 641 (see FIG. 3) protruding from the base 2 are electrically connected to an external device (not shown).

As shown in FIG. 4, the second fixed terminal 7 is supported by the base 2 at a position spaced apart from the first fixed terminal 6 in the front-rear direction. The second fixed terminal 7 is disposed rearward of the first fixed terminal 6 and spaced apart from the first fixed terminal 6. The second fixed terminal 7 has the same shape as the first fixed terminal 6. As shown in FIG. 4, the second fixed terminal 7 has a contact support portion 71, a second fixed contact 72, and a pair of a first external connection portion 73 and a second external connection portion 74. The configurations of the second fixed terminal 7 are similar to those of the first fixed terminal 6, and therefore will not be described.

(movable part 9, return spring 8)
The movable portion 9 extends in the vertical direction as shown in Fig. 2. The movable portion 9 includes a movable contact piece 90, a movable member 91, a cover member 92, and a contact spring 93 as shown in Fig. 2.

As shown in FIG. 4, the movable contact piece 90 extends in the front-rear direction. The movable contact piece 90 is connected to a movable member 91. The movable contact piece 90 is disposed above the first fixed terminal 6 and the second fixed terminal 7.

The movable contact piece 90 has a pair of a first movable contact 81 and a second movable contact 82, and a contact support member 83. The contact support member 83 is plate-shaped and extends in the front-rear direction.

The first movable contact 81 is disposed at the front end of the contact support member 83. The first movable contact 81 is disposed above the first fixed contact 62 and facing the first fixed contact 62. The first movable contact 81 is capable of contacting the first fixed contact 62.

The second movable contact 82 is disposed at the rear end of the contact support member 83. The second movable contact 82 is disposed above the second fixed contact 72 and faces the second fixed contact 72. The second movable contact 82 is capable of contacting the second fixed contact 72. The first movable contact 81 and the second movable contact 82 may be integral with the contact support member 83.

The movable contact piece 90 is movable in a first direction. The first direction includes a contact direction in which the first movable contact 81 and the second movable contact 82 approach the first fixed contact 62 and the second fixed contact 72, and a separation direction in which the first movable contact 81 and the second movable contact 82 separate from the first fixed contact 62 and the second fixed contact 72. In this embodiment, the first direction is the up-down direction, the contact direction is the direction indicated by Z1 (downward), and the separation direction is the direction indicated by Z2 (upward).

The movable contact piece 90 is movable between an open position in which the pair of first and second movable contacts 81 and 82 are separated from the first and second fixed contacts 62 and 72, and a closed position in which the pair of first and second movable contacts 81 and 82 are in contact with the first and second fixed contacts 62 and 72.

As shown in FIG. 4, the movable member 91 is connected to the movable contact piece 90 between the first movable contact 81 and the second movable contact 82. The movable member 91 is disposed in the center of the movable contact piece 90 in the front-rear direction.

The movable member 91 and the cover member 92 are made of an insulating material such as resin.

The movable member 91 has a pressing portion 911, a positioning portion 912, and a sliding portion 913. The pressing portion 911 is provided on the upper portion of the movable member 91. The pressing portion 911 is a portion that is pressed downward by the movable iron piece 45 of the drive unit 4.

The arrangement portion 912 is a portion that is approximately in the center of the movable member 91 in the up-down direction. The contact spring 93 and the movable contact piece 90 are arranged in the arrangement portion 912. The arrangement portion 912 has an arrangement space 912a with an open right side wall, and the contact spring 93 is arranged in the arrangement space 912a. A notch 914 is formed in the side wall in the front-to-rear direction at the lower end of the arrangement space 912a. The movable contact piece 90 is arranged penetrating the notches 914 in both side walls and the arrangement space 912a.

The sliding portion 913 is the lower end portion of the movable member 91. The sliding portion 913 is guided by a guide portion (not shown) formed on the base 2. The guide portion is formed so as to be recessed downward on the upper surface of the base 2. The movable member 91 is guided by the sliding of the sliding portion 913 within the guide portion.

As shown in Figures 2 and 3, the cover member 92 covers the right side of the arrangement space 912a. The cover member 92 prevents the movable contact piece 90 from jumping out to the right side from the movable member 91.

As shown in FIG. 4, the contact spring 93 is a coil spring, and is arranged in the arrangement space 912a along the vertical direction. The upper end of the contact spring 93 is connected to the upper surface of the arrangement space 912a. The lower end of the contact spring 93 is connected between the first movable contact 81 and the second movable contact 82 of the movable contact piece 90. The contact spring 93 is arranged in a compressed state between the upper surface of the arrangement space 912a and the movable contact piece 90. As a result, the contact spring 93 urges the movable contact piece 90 in the contact direction. The movable contact piece 90 is pressed by the contact spring 93 against the lower surface of the arrangement space 912a.

The contact spring 93 is provided to increase the contact pressure of the first movable contact 81 against the first fixed contact 62 and the contact pressure of the second movable contact 82 against the second fixed contact 72.

The return spring 8 is disposed between the sliding portion 913 of the movable member 91 and a guide portion (not shown) of the base 2. The return spring 8 biases the movable member 91 upward. When the movable portion 9 is released from the pressure of the drive unit 4, the return spring 8 moves the movable portion 9 upward. This moves the movable contact piece 90 from the contact position to the separation position.

(Magnet section 5)
1 generates a magnetic field in the front-rear direction for extending the arc generated between the first fixed contact 62 and the first movable contact 81, and the arc generated between the second fixed contact 72 and the second movable contact 82. The magnet unit 5 is disposed around the case 10.

The magnet section 5 has a pair of magnets 51 and a pair of yokes 52 (see FIG. 2). The pair of magnets 51 are permanent magnets. The pair of magnets 51 are arranged on the front and rear surfaces of the case 10. FIG. 2 shows only the magnet 51 arranged on the rear surface. The pair of magnets 51 are arranged so that the opposite poles face each other.

The pair of yokes 52 are generally L-shaped when viewed from the left to right direction and are attached to the case 10. Each of the pair of yokes 52 is connected to the magnet 51 so as to cover the outer side and upper side of each magnet 51. Note that only the rear yoke 52 is shown in FIG. 2.

The above-mentioned magnet section 5 causes the arc generated between the first fixed contact 62 and the first movable contact 81, and the arc generated between the second fixed contact 72 and the second movable contact 82, to extend in the front-rear direction (an example of the second direction).

(Drive unit 4)
As shown in Fig. 2, the drive device 4 is disposed to the left of the contact device 3. The drive device 4 moves the movable part 9 in the vertical direction. As shown in Figs. 2 and 3, the drive device 4 has a coil 41, a bobbin 42, a fixed iron core 43, a yoke 44, a movable iron piece 45, a spring 46 (an example of a biasing part), and a stopper member 47.

The coil 41 is wound around the outer circumference of the bobbin 42. The bobbin 42 extends in the vertical direction. The bobbin 42 is fixed to the base 2. The fixed core 43 is disposed on the inner circumference of the bobbin 42. The bobbin 42 has a first flange portion 110, a second flange portion 120, and a placement portion 130.

The first flange portion 110 is the lower portion of the coil 41. The first flange portion 110 is plate-shaped and is placed on the base 2. The second flange portion 120 is disposed above the coil 41. The second flange portion 120 is plate-shaped. The placement portion 130 is provided at the tip of the right end of the second flange portion 120. The stopper member 47 is disposed in the placement portion 130. The stopper member 47 and the placement portion 130 will be described in detail later.

The yoke 44 is generally L-shaped when viewed from the front-to-rear direction and is positioned so as to cover the left side of the coil 41. The yoke 44 is connected to the lower end of the fixed core 43.

The movable iron piece 45 is disposed above the fixed iron core 43. The left end of the movable iron piece 45 is rotatably supported by the yoke 44. The movable iron piece 45 rotates with the upper end of the yoke 44 as a fulcrum. As shown in FIG. 4, the tip 45a of the right end of the movable iron piece 45 contacts the pressing portion 911 of the movable part 9 from above.

The spring 46 is disposed along the front-rear direction at the upper end of the yoke 44. The spring 46 is disposed above the movable iron piece 45. The spring 46 biases the movable iron piece 45 in a direction away from the fixed iron core 43.

When electricity is applied to the coil 41, the movable iron piece 45 is attracted to the fixed iron core 43, and the tip 45a rotates downward (see arrow B1 in FIG. 3). When electricity is stopped from passing through the coil 41, the action of the spring 46 causes the movable iron piece 45 to rotate so that its tip 45a faces upward (see arrow B2). Arrow B1 is an example of the pressing direction, and arrow B2 is an example of the releasing direction.

The stopper member 47 is disposed in the arrangement portion 130. The stopper member 47 prevents the movable iron piece 45 from moving upward by more than a predetermined amount due to the biasing force of the spring 46.

(Stopper member 47)
Fig. 5 is a cross-sectional view taken along line A-A in Fig. 4. Fig. 6(a) is a perspective view of the stopper member 47 as viewed from above. Fig. 6(b) is a perspective view of the stopper member 47 as viewed from below. Fig. 7(a) is a plan view of the stopper member 47 as viewed from above. Fig. 7(b) is a side view of the stopper member 47 as viewed from the right. Fig. 7(c) is a front view of the stopper member 47 as viewed from the front.

The stopper member 47 can be formed, for example, by bending a long, thin plate-like member. The stopper member 47 has a stopper portion 471, a fixed portion 472, and a connection portion 473.

The stopper portion 471 can come into contact with the movable iron piece 45. The stopper portion 471 is in the form of a long, thin plate. The stopper portion 471 is arranged so that the plate-shaped main surface is perpendicular to the up-down direction. As shown in Figures 4 and 5, the stopper portion 471 is arranged on the upper side of the movable iron piece 45. The stopper portion 471 is arranged along the front-to-rear direction. The stopper portion 471 is arranged so as to straddle the movable iron piece 45 in the front-to-rear direction when viewed from above. Note that in this specification, parallel and perpendicular include mechanical errors and include the range that can be considered as parallel and perpendicular according to social conventions.

The fixed part 472 is fixed to the fixing part 141 (described later) of the arrangement part 130. The fixed part 472 is a long and narrow plate. The fixed part 472 is arranged so that the main surface of the plate is perpendicular to the up-down direction. The fixed part 472 is arranged parallel to the stopper part 471 along the front-rear direction. The fixed part 472 is arranged below the stopper part 471. The fixed part 472 is arranged rearward of the movable iron piece 45.

As shown in Figs. 6(a) and 6(b), the connection part 473 connects an end of the stopper part 471 and an end of the fixed part 472. The connection part 473 is in the form of a long, thin plate. The connection part 473 is arranged so that the main surface of the plate is perpendicular to the front-rear direction.

In detail, the connection portion 473 connects the rear end 471a of the stopper portion 471 and the rear end 472a of the fixed portion 472. As shown in FIG. 5, the connection portion 473 is arranged in the up-down direction. The stopper portion 471 extends forward (an example of the same direction) from the upper end of the connection portion 473, and the fixed portion 472 extends forward (an example of the same direction) from the lower end of the connection portion 473. The length of the fixed portion 472 is formed shorter than the length of the stopper portion 471.

In the stopper member 47 of this embodiment, as shown in FIG. 7(b), the stopper portion 471 is formed perpendicular to the connection portion 473, and the fixed portion 472 is formed perpendicular to the connection portion 473.

The stopper portion 471 has a convex portion 474 and a pair of concave portions 475. The convex portion 474 is formed on a surface 471c facing downward of the stopper portion 471. The surface 471c can also be said to be the surface of the stopper portion 471 facing the fixed portion 472. The convex portion 474 protrudes downward from the surface 471c. As shown in FIG. 5, the convex portion 474 can contact the movable iron piece 45. As shown in FIG. 7(a), the pair of concave portions 475 are formed between the convex portion 474 and the end 471a of the stopper portion 471. The pair of concave portions 475 are provided opposite both ends of the width direction (left and right direction) of the stopper portion 471. Each concave portion 475 is formed from the surface 471c facing downward to the surface 471b facing upward of the stopper portion 471. The width of the stopper portion 471 is narrower than other portions due to the formation of the pair of concave portions 475. This allows the tip side of the stopper portion 471 beyond the recess 475 to rotate vertically with respect to the portion where the recess 475 is formed (see the arrow in FIG. 7(b)). This rotation allows the restriction position of the movable iron piece 45 in the vertical direction to be adjusted. In FIG. 7(b), the stopper portion 471 in the upwardly rotated state is shown by a two-dot chain line.

The connection portion 473 has a bulge portion 476. As shown in Figures 6(a), 6(b), and 7(c), the bulge portion 476 is formed by cutting out a central portion in the width direction of the connection portion 473, and the cut-out portion is formed so as to protrude in the opposite direction to the extension direction of the stopper portion 471. The bulge portion 476 protrudes toward the rear side from the rear surface 473a of the connection portion 473. The bulge portion 476 is curved convexly in the opposite direction to the extension direction of the stopper portion 471. The bulge portion 476 has elasticity.

(Placement Unit 130)
As shown in Figures 2 and 4, the arrangement portion 130 is arranged on the right side of the second flange portion 120. The arrangement portion 130 is integrally connected to the right end of the second flange portion 120. As shown in Figure 3, a lower surface 130a of the arrangement portion 130 is located on the same plane as the lower surface 120a of the second flange portion 120. The arrangement portion 130 protrudes upward beyond the second flange portion 120.

As shown in Figures 2 and 4, the placement portion 130 has a first end portion 131, a second end portion 132, and a central portion 133. The first end portion 131 is disposed at the rear of the right end of the second flange portion 120. The first end portion 131 has an outer shape that is approximately rectangular.

The second end 132 is located in front of the right end of the second flange portion. The second end 132 has an external shape that is approximately rectangular. The upward heights of the first end 131 and the second end 132 are the same.

The central portion 133 is disposed between the first end portion 131 and the second end portion 132. The central portion 133 is connected to the first end portion 131 and the second end portion 132. As shown in FIG. 4, the upward height of the central portion 133 is formed to be lower than the first end portion 131 and the second end portion 132. The tip portion 45a of the movable iron piece 45 is formed to be thin, and extends above the central portion 133, passing between the first end portion 131 and the second end portion 132, toward the pressing portion 911 of the movable portion 9.

As shown in FIG. 5, the first end 131 has a fixing portion 141 and a restricting portion 142 (an example of a first restricting portion). A through hole 131a is formed in the first end 131 in the front-rear direction. The through hole 131a forms a space having a substantially rectangular prism shape. The fixing portion 141 is a portion of the first end 131 below the through hole 131a. An insertion hole 141b is formed in the fixing portion 141 from the rear side surface 141a toward the front direction. The restricting portion 142 is a portion above the through hole 131a of the first end 131. The lower surface 142a of the restricting portion 142 (which can also be said to be the upper surface of the through hole 131a) is formed perpendicular to the up-down direction.

The stopper member 47 is fixed to the fixing portion 141 of the first end 131. The fixed portion 472 of the stopper member 47 is press-fitted into the insertion hole 141b of the fixing portion 141. The connection portion 473 is arranged to extend upward along the side surface 141a. The stopper portion 471 is arranged to extend forward from the upper end of the connection portion 473 through the through hole 131a. A narrow space S (an example of a gap) is formed between the stopper portion 471 and the restricting portion 142. The tip 471e of the stopper portion 471 is arranged between the first end 131 and the second end 132.

A through hole 132a is also formed in the second end 132 along the front-rear direction. The through hole 132a is formed in a straight line along the front-rear direction with the through hole 131a.

As shown in FIG. 5, a pair of side walls 150, 151 are formed downward from the top surface 10a of the case 10 to sandwich the placement section 130 from the front and rear. The pair of side walls 150, 151 are arranged perpendicular to the front-to-rear direction. The side wall 150 is arranged on the front side of the placement section 130. The side wall 151 is arranged on the rear side of the placement section 130. The bulge portion 476 of the stopper member 47 abuts against the front surface of the side wall 151, which is arranged behind the first end portion 131. This abutment of the side wall 151 against the bulge portion 476 can prevent the stopper member 47 from jumping out of the placement section 130.

<Operation>
Next, the operation of the electromagnetic relay 1 will be described.

When no voltage is applied to the coil 41, the elastic force of the return spring 8 presses the movable part 9 in the opening direction, and the movable contact piece 90 is in the open position.

When a voltage is applied to the coil 41 and the drive unit 4 is excited, the movable iron piece 45 is attracted to the fixed iron core 43 and rotates, and the movable iron piece 45 presses the movable part 9 in the contact direction. This causes the movable part 9 to move in the contact direction against the elastic force of the return spring 8.

As the movable part 9 moves in the contact direction, the movable contact piece 90 moves to the closed position. This causes the first movable contact 81 to contact the first fixed contact 62, and the second movable contact 82 to contact the second fixed contact 72. At this time, the movable contact piece 90 is biased in the contact direction by the contact spring 93, so that the contact pressure of the first movable contact 81 against the first fixed contact 62 and the contact pressure of the second movable contact 82 against the second fixed contact 72 can be sufficiently ensured.

When the application of voltage to the coil 41 is stopped, the spring 46 separates the movable iron piece 45 from the fixed iron core 43, and the pressure applied by the movable iron piece 45 to the movable part 9 is released. As a result, the movable part 9 moves in the opening direction due to the elastic force of the return spring 8, and the movable contact piece 90 returns to the open position.

<Actions and Effects>
The electromagnetic relay 1 of this embodiment is provided with a fixing portion 141 that fixes the stopper member 47 to the bobbin 42, and a restricting portion 142 that restricts deformation of the stopper member 47 upon collision with the movable iron piece 45. As a result, even if an impact load from the movable iron piece 45 is applied to the stopper member 47, the deformation of the stopper member 47 is restricted by the restricting portion 142, so that the deformation of the stopper member 47 can be reduced.

In the electromagnetic relay 1 of this embodiment, the stopper member 47 has a stopper portion 471, a fixed portion 472, and a connecting portion 473. The stopper member 47 can come into contact with the movable iron piece 45. The fixed portion 472 is fixed to the fixed portion 141. The connecting portion 473 connects an end 472a of the fixed portion 472 to an end 471a of the stopper portion 471. The stopper portion 471 and the fixed portion 472 are formed to extend in the same direction from the connecting portion 473 in parallel to each other.

Because the stopper member 47 is bent in this way, it has elasticity and can absorb the impact caused by the collision of the movable iron piece 45.

The fixed portion 472 is disposed on the pressing direction side of the movable iron piece 45 relative to the stopper portion 471. The fixed portion 141 has an insertion hole 141b into which the fixed portion 472 is inserted. The connection portion 473 is disposed on the opposite side of the fixed portion 141 from the movable iron piece 45.

In this way, the fixed portion 472 is inserted into the insertion hole 141b formed in the fixed portion 141, thereby fixing the stopper member 47 to the fixed portion 141.

The restricting portion 142 is disposed opposite the stopper portion 471 to the movable iron piece 45, at least when the movable iron piece is not in contact with the stopper portion 471, with a predetermined narrow gap S therebetween. This allows the restricting portion 142 to restrict deformation of the stopper portion 471 that bends toward the opposite side to the movable iron piece 45 due to collision with the movable iron piece 45.

The stopper portion 471 is disposed on the surface facing the movable iron piece 45 and has a protrusion 474 that can come into contact with the movable iron piece 45. This allows the contact position of the stopper member 47 with the movable iron piece 45 to be stabilized.

The stopper portion 471 has a recess 475 formed between the portion with which the movable iron piece 45 comes into contact and the end 471a. This allows the tip side of the stopper portion 471 to be bent using the recess 475 as a reference point, allowing the position at which the stopper portion 471 restricts the movable iron piece 45 to be adjusted.

The connection portion 473 has an elastic bulge 476 that protrudes in the opposite direction (rearward) from the direction in which the stopper portion 471 and the fixed portion 472 extend (forward). The bulge 476 comes into contact with the side wall 151 formed on the inside of the case 10.

In this case, the stopper member 47 can be prevented from jumping out of the bobbin 42.

<Other embodiments>
Although an embodiment of an electromagnetic relay according to one aspect of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention. For example, the configuration of the contact device 3 or the drive device 4 may be changed.

In the above embodiment, as shown in FIG. 5, the tip of the stopper portion 471 does not reach the second end 132, but may be inserted into the through hole 132a of the second end 132. FIG. 8 is a cross-sectional view showing a state in which the stopper member 47' in which the tip of the stopper portion 471' is inserted into the through hole 132a of the second end 132 is placed in the placement portion 130. FIG. 9 is a perspective view showing the stopper member 47'. The stopper member 47' has the same basic configuration as the stopper member 47, but the length of the stopper portion 471' is different from the length of the stopper portion 471 of the stopper member 47. The stopper portion 471' shown in FIG. 9 is formed longer from the protrusion 474 to the tip side than the stopper portion 471.

As shown in FIG. 8, when the stopper member 47' is placed in the placement section 130, the tip 471e' of the stopper section 471' is inserted into the through hole 132a of the second end section 132. The upper part of the through hole 132a of the second end section 132 corresponds to the restricting section 143 (an example of a second restricting section). The lower surface 143a of the restricting section 143 is perpendicular to the up-down direction. The restricting section 143 is placed with a narrow gap S between it and the stopper section 471'. The gap between the restricting section 142 and the stopper section 471' and the gap between the restricting section 143 and the stopper section 471' may be the same or different.

In this case, the movement of the tip of the stopper member 47 caused by the collision of the movable iron piece 45 is restricted by the restricting portion 143, so deformation of the stopper member 47' can be further suppressed.

In the stopper member 47 described in the above embodiment, the tip of the stopper portion 471 does not reach the second end 132, so the through hole 132a of the second end 132 does not need to be formed. In addition, the second end 132 itself does not need to be provided.

In the stopper member 47 of the above embodiment, the stopper portion 471 is located above the fixed portion 472, but if it is acceptable for the height in the vertical direction to be greater, the fixed portion 472 may be located above the stopper portion 471.

In the above embodiment, the connection portion 473 is arranged along the vertical direction, but it may be inclined with respect to the vertical direction. In this case, the angle between the connection portion 473 and the stopper portion 471 does not have to be perpendicular, and the angle between the connection portion 473 and the fixed portion 472 does not have to be perpendicular either.

In the above embodiment, as shown in FIG. 5, the recess 475 is located inside the through hole 131a of the first end 131, but it may be located outside the through hole 131a (forward of the first end 131).

1: Electromagnetic relay 9: Movable portion 41: Coil 42: Bobbin 45: Movable iron piece 47: Stopper member 62: First fixed contact 72: Second fixed contact 81: First movable contact 82: Second movable contact 141: Fixed portion 142: Restricting portion

Claims (8)

A fixed terminal having a fixed contact;
a movable portion having a movable contact piece including a movable contact facing the fixed contact, the movable contact being movable in a contact direction in which the movable contact approaches the fixed terminal and in a separation direction in which the movable contact separates from the fixed contact;
a movable iron piece movable in a pressing direction in which the movable portion is pressed in the contact direction and in a release direction in which the pressing against the movable portion is released;
a coil that generates a magnetic force that moves the movable iron piece in the pressing direction;
a bobbin on which the coil is disposed;
a biasing portion that biases the movable iron piece in the release direction;
a stopper member that restricts the movement of the movable iron piece in the release direction,
The movable iron piece is disposed so as to overlap the stopper member in the release direction,
The bobbin has a fixing portion that fixes the stopper member, and a first restricting portion that restricts deformation of the stopper member due to collision of the movable iron piece.
Electromagnetic relay. The stopper member is
A stopper portion capable of coming into contact with the movable iron piece;
A fixed portion fixed to the fixing portion;
a connecting portion that connects one end of the fixed portion and one end of the stopper portion,
The stopper portion and the fixed portion are formed to extend in the same direction from the connection portion in parallel to each other.
2. An electromagnetic relay as claimed in claim 1. the fixed portion is disposed on the pressing direction side of the stopper portion,
the fixing portion has an insertion hole into which the fixed portion is inserted,
The connection portion is disposed on the opposite side of the fixed portion from the movable iron piece.
3. An electromagnetic relay as claimed in claim 2. The first restricting portion is disposed opposite the stopper portion to the movable iron piece with a predetermined gap therebetween, at least when the movable iron piece is not in contact with the stopper portion.
4. An electromagnetic relay according to claim 2 or 3. The stopper portion is disposed on a surface of the movable iron piece and has a protrusion that can come into contact with the movable iron piece.
The electromagnetic relay according to any one of claims 2 to 4. The bobbin further includes a second restricting portion that restricts a tip end of the stopper portion,
The second restricting portion is disposed opposite to the first restricting portion with the movable iron piece therebetween,
The second restricting portion is disposed opposite to the stopper portion with a predetermined gap therebetween, at least when the movable iron piece is not in contact with the stopper portion.
5. An electromagnetic relay according to claim 4. The stopper portion has a recess formed between a portion with which the movable iron piece comes into contact and the one end.
The electromagnetic relay according to any one of claims 2 to 6. a case that covers the fixed terminal, the movable iron piece, the coil, the bobbin, the biasing portion, and the stopper member,
the connecting portion has an elastic bulge portion that protrudes in a direction opposite to a direction in which the stopper portion and the fixed portion extend,
The bulge portion is in contact with a side wall formed on the inside of the case.
4. An electromagnetic relay according to claim 3.

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