Movable contact part and direct current relay including same

Patent metadata

Field	Value
Publication number	US-12462995-B2
Application number	US-202118035462-A
Country	US
Kind code	B2
Filing date	Nov 2, 2021
Priority date	Nov 4, 2020
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

Disclosed are a movable contact part and a direct current relay including same. The movable contact part comprises an upper yoke. The upper yoke generates a magnetic force that attenuates the electromagnetic repulsive force generated between a movable contact and a fixed contact.
The upper yoke includes a cover part covering the movable contact from above and an arm part connected to the cover part and covering the movable contact from both sides. The arm part is thinner than the cover part. A curved portion of the arm part is shorter than the cover part and an extension portion.
Thus, even though the total weight of the upper yoke is reduced, the area of the upper yoke is increased, and the thickness and length of a support part can be maintained. Consequently, the intensity of the magnetic force of the upper yoke can be enhanced.

First claim

The invention claimed is:

1 . A movable contact part, comprising:
a movable contact which is in contact with or spaced apart from a fixed contact; an upper yoke which is located on a first side of the movable contact, surrounds a portion of the movable contact and forms a magnetic force; and a lower yoke which is located on a second side of the movable contact, opposite to the first side, supports the movable contact and forms a magnetic force, wherein the upper yoke comprises:
a cover part which is formed in a plate shape having a first thickness and faces the first side of the movable contact;
an arm part which is continuous with the cover part, which faces a third side of the movable contact substantially orthogonal to the first side and is formed to have a second thickness smaller than the first thickness of the cover part; and
an upper slimming groove that defines a space bounded by an end of the cover part from which the arm part extends from the cover part.

2 . The movable contact part of claim 1 , wherein the movable contact has an extension length in a first direction longer than an extension length in a second direction,
wherein the cover part is formed such that the extension length in the second direction is longer than the extension length in the first direction, and wherein the arm part is continuous with an end of the cover part in the other second direction.

3 . The movable contact part of claim 2 , wherein a plurality of arm parts are provided, and the plurality of arm parts are continuous with each end of the cover part in the second direction.

4 . The movable contact part of claim 1 , wherein a portion where the arm part is continuous with the cover part is located to be biased toward the movable contact, and
wherein the upper slimming groove is located on one side of the arm part opposite to the movable contact.

5 . The movable contact part of claim 1 , wherein a portion where the arm part is continuous with the cover part is located opposite to the movable contact, and
wherein the upper slimming groove is located on one side of the arm part facing the movable contact.

6 . The movable contact part of claim 1 , wherein the arm part comprises:
a curved portion which is continuous with the cover part, is formed in a round shape so as to be convex radially outward of the movable contact and extends toward the lower yoke; and an extension portion which is continuous with the curved portion and extends toward the lower yoke.

7 . The movable contact part of claim 6 , wherein the movable contact has an extension length in a first direction longer than an extension length in a second direction, and
wherein a length of the curved portion extending in the second direction is shorter than lengths of the cover part and the extension portion extending in the second direction.

8 . The movable contact part of claim 1 , wherein the lower yoke comprises:
a support part which supports the movable contact and is formed in a plate shape; and a wing part which is continuous with the support part and extends outwardly from an end of the support part.

9 . The movable contact part of claim 8 , wherein the first thickness of the cover part is formed to be less than or equal to a third thickness of the support part.

10 . The movable contact part of claim 8 , wherein the second thickness of the arm part is formed to be less than or equal to a third thickness of the wing part.

11 . The movable contact part of claim 8 , wherein a first sum of volumes of the cover part and the arm part of the upper yoke is less than or equal to a sum of volumes of the support part and the wing part of the lower yoke.

12 . A direct current relay, comprising:
a fixed contact which is energized with an external power source or load; and a movable contact part which is located below the fixed contact and moves in a direction toward the fixed contact and in a direction away from the fixed contact, wherein the movable contact part comprises:
a movable contact which is in contact with or spaced apart from the fixed contact;
an upper yoke which is located above the movable contact and surrounds the movable contact; and
a lower yoke which is located below the movable contact and supports the movable contact,
wherein the upper yoke and the lower yoke respectively form a magnetic force that attenuates an electromagnetic repulsive force generated between the fixed contact and the movable contact part, and wherein the upper yoke comprises:
a cover part which surrounds an upper side of the movable contact and is formed in a plate shape having a first thickness and;
an arm part which is continuous with an edge of the cover part, extends toward the lower yoke to face a second side of the movable contact part substantially orthogonal to the upper side and has a second thickness smaller than the first thickness of the cover part; and
an upper slimming groove which is a space formed by being surrounded by an edge of the cover part and the arm part.

13 . The direct current relay of claim 12 , wherein the arm part is continuous with the edge of the cover part so as to be biased toward the upper side, and the upper slimming groove is located below the arm part.

14 . The direct current relay of claim 12 , wherein the arm part is continuous with the edge of the cover part so as to be biased toward the lower side, and the upper slimming groove is located above the arm part.

15 . A movable contact part, comprising:
a movable contact configured to be in contact with a fixed contact when in a first state and spaced apart from the fixed contact when in a second state; a lower yoke located on a lower side of the movable contact that supports the movable contact; an upper yoke located on an upper side of the movable contact, opposite to the lower side, surrounding a portion of the movable contact, wherein the upper yoke comprises:
a cover part formed in a plate shape having a first thickness between a first face that faces the upper side of the movable contact and a second face that faces away from the movable contact;
a first arm part having a second thickness between a first inner surface that faces the movable contact and a first outer surface that faces away from the movable contact, the second thickness being less than the first thickness, and comprising:
a first extension part formed in a plate shape disposed substantially orthogonally to the cover part; and
a first curved part connecting the first extension part continuously with a first end of the cover part, wherein a first slimming groove is defined between the first arm part and the first end of the cover part.

16 . The movable contact part of claim 15 , the upper yoke further comprising:
a second arm part having the second thickness between a second inner surface that faces the movable contact and a second outer surface that faces away from the movable contact and comprising:
a second extension part formed in a plate shape and disposed substantially orthogonally to the cover part on an opposite side of the movable contact relative to the first extension part; and
a second curved part connecting the second extension part continuously with a second end of the cover part, opposite to the first end, wherein a second slimming groove is defined between the first arm part and the second end of the cover part.

17 . The movable contact part of claim 16 , wherein portions of the first outer surface and the second outer surface are coplanar with the second face of the cover part where the fir

Assignees

• Ls Electric Co Ltd

Inventors

• Yoo Jung Woo

Classifications

• H01H1/50

  Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position · CPC title

• H01H50/54

  Contact arrangements · CPC title

• H01H50/36 Primary

  Stationary parts of magnetic circuit, e.g. yoke · CPC title