Electromagnetic relay

• US 9,007,156 B2
• Filed: 12/03/2013
• Issued: 04/14/2015
• Est. Priority Date: 12/07/2012
• Status: Active Grant

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Hiraiwa, Nobuyoshi, Saito, Yasushi, Kakoiyama, Yuki, Wu, Yanfeng
• Primary Examiner(s): Ismail, Shawki S
• Assistant Examiner(s): HOMZA, LISA NHUNG
• Application Number:
  US14/095,046
• Publication Number:
  US 20140159837A1
• Time in Patent Office: 497 Days
• Field of Search: 335/78
• US Class Current: 335/78
• CPC Class Codes: H01H 2050/028 Means to improve the overall withstanding voltage, e.g. creepage distances
• CPC Class Codes: H01H 2050/446 Details of the insulating support of the coil, e.g. spool, bobbin, former
• CPC Class Codes: H01H 50/28 Parts movable due to bending of a blade spring or reed
• CPC Class Codes: H01H 50/42 Auxiliary magnetic circuits, e.g. for maintaining armature in, or returning armature to, position of rest, for damping or accelerating movement
• CPC Class Codes: H01H 9/443 using permanent magnets

Abstract

An electromagnetic relay includes a first stationary contact; a second stationary contact that is aligned with the first stationary contact in a first direction; a first movable contact that is movable toward/away from the first stationary contact in a second direction perpendicular to the first direction; a second movable contact that is movable toward/away from the second stationary contact in the second direction; and a first permanent magnet and a second permanent magnet that face each other. A first contact part, formed by the first stationary contact and the first movable contact, and a second contract part, formed by the second stationary contact and the second movable contact, are interposed between the first permanent magnet and the second permanent magnet in the first direction. The first permanent magnet and the second permanent magnet extend in a third direction, which is perpendicular to the first direction and the second direction.

Claims

1. An electromagnetic relay comprising:

a first stationary contact;

a second stationary contact that is aligned with the first stationary contact in a first direction;

a first movable contact that faces the first stationary contact and is configured to be movable toward and away from the first stationary contact in a second direction substantially perpendicular to the first direction, the first stationary contact and the first movable contact forming a first contact part;

a second movable contact that faces the second stationary contact and is configured to be movable toward and away from the second stationary contact in the second direction, the second stationary contact and the second movable contact forming a second contact part;

a first permanent magnet;

a second permanent magnet that faces the first permanent magnet;

a first permanent magnet mount part to which the first permanent magnet is mounted; and

a second permanent magnet mount part to which the second permanent magnet is mounted;

wherein the first contact part and the second contact part are interposed between the first permanent magnet and the second permanent magnet with respect to the first direction; and

wherein the first permanent magnet mount part and the second permanent mount part are insulated from the first contact part and the second contact part.

2. The electromagnetic relay as claimed in claim 1, further comprising:

a magnetic body that includes a first side, which comes into contact with the first permanent magnet, and a second side, which comes into contact with the second permanent magnet and faces the first side;

wherein the first permanent magnet and the second permanent magnet are interposed between the first side and the second side.

3. The electromagnetic relay as claimed in claim 1, further comprising:

a third permanent magnet mount part to which a third permanent magnet is mounted;

wherein the third permanent magnet mount part is interposed between the first contact part and the second contact part.

4. An electromagnetic relay comprising:

a stationary contact;

a movable contact that faces the stationary contact;

an electromagnet that includes a coil that generates an electromagnetic force, and a bobbin to which the coil is wound; and

a coil accommodating part in which the coil is arranged,

wherein the bobbin and the coil accommodating part include engagement portions that form a concave-convex structure upon being engaged to each other.

5. The electromagnetic relay as claimed in claim 4, further comprising:

a yoke that is arranged outside the coil accommodating part.

6. The electromagnetic relay as claimed in claim 4, further comprising:

a core that is arranged at a center portion of the coil; and

a core mount part to which the core is mounted;

wherein the bobbin includes a coil winding part to which the coil is wound;

and a concave-convex structure is arranged between the coil winding part and the core mount part.

7. The electromagnetic relay as claimed in claim 4, further comprising:

an accommodating part in which the electromagnet is arranged; and

a cover that is configured to cover the electromagnetic relay;

wherein the accommodating part includes a concave-convex structure.

8. The electromagnetic relay as claimed in claim 7, wherein the concave-convex structure is formed at a portion of the accommodating part that comes into engagement with the other element of the electromagnetic relay.

9. The electromagnetic relay as claimed in claim 7, further comprising:

a first stationary contact;

a second stationary contact that is aligned with the first stationary contact; and

a first engagement portion that is arranged between the stationary contact and the second stationary contact;

wherein the cover includes a second engagement portion that engages with the first engagement portion.

10. The electromagnetic relay as claimed in claim 9, wherein

the first engagement portion includes

a first wall that is arranged between the first stationary contact and the second stationary contact;

a second wall that is arranged between the first stationary contact and the second stationary contact; and

a concave portion that is formed between the first wall and the second wall;

wherein the second engagement portion includes a convex portion that is configured to engage the concave portion.

11. An electromagnetic relay comprising:

a first stationary contact;

a second stationary contact that is aligned with the first stationary contact in a first direction;

a first movable contact that faces the first stationary contact and is configured to be movable toward and away from the first stationary contact in a second direction substantially perpendicular to the first direction, the first stationary contact and the first movable contact forming a first contact part;

a second movable contact that faces the second stationary contact and is configured to be movable toward and away from the second stationary contact in the second direction, the second stationary contact and the second movable contact forming a second contact part;

a first permanent magnet;

a second permanent magnet; and

a third permanent magnet;

wherein the first contact part and the second contact part are interposed between the first permanent magnet and the second permanent magnet with respect to the first direction; and

the third permanent magnet is interposed between the first contact part and the second contact part.