DC relay and manufacturing method thereof

Abstract

A DC relay and a manufacturing method thereof are disclosed. According to an embodiment of the present invention, a movable contact part of the DC relay includes a movable contact and a lower yoke located at the lower side of the movable contact. The lower yoke is configured to offset the electromagnetic reaction force generated by the contact between the movable contact and the fixed contact. The lower yoke can be configured to offset the electromagnetic reaction force by itself, or to offset the electromagnetic reaction force together with the upper yoke. The movable contact and the lower yoke are in contact with each other. The lower side of the movable contact is in contact with the upper side of the lower yoke. The movable contact is provided with a coupling protrusion formed to protrude downward. The lower yoke is provided with a movable contact coupling portion formed by being recessed in a direction opposite to the movable contact. The coupling protrusion can be inserted into the movable contact coupling portion. After the coupling protrusion is inserted into the movable contact coupling portion, it can be subjected to a pressure toward the radial outer side. Through the pressure, the coupling protrusion expands toward the radial outer side. Therefore, the outer peripheral surface of the coupling protrusion is clamped and coupled to the inner peripheral surface of the lower yoke forming the movable contact coupling portion. Therefore, an additional fastening member for combining the movable contact and the lower yoke is not required. Therefore, the manufacturing method of the DC relay can be simplified.

Description

Technical Field

[0001] The present invention relates to a DC relay and a method for manufacturing the same, and more particularly to a DC relay and a method for manufacturing the same that can concisely realize a structure in which a lower yoke and a movable contact are combined to offset the electromagnetic reaction force of a fixed contact and a movable contact. Background Art

[0002] A direct current relay is a device that uses the principle of an electromagnet to transmit mechanical drive or current signals. A direct current relay is also called a magnetic switch and is usually classified as an electrical circuit switching device.

[0003] The DC relay can be operated by connecting an external control power supply. The DC relay includes a fixed core and a movable core that can be magnetized by the control power supply. The fixed core and the movable core are arranged adjacent to a bobbin on which a plurality of coils are wound.

[0004] When the control power is turned on, the plurality of coils form an electromagnetic field, and the fixed core and the movable core are magnetized by the electromagnetic field, thereby generating an electromagnetic attraction force between the fixed core and the movable core.

[0005] Since the fixed core is fixed, the movable core will move toward the fixed core. One side of the shaft member is connected to the movable core. And the other side of the shaft member is connected to the movable contact piece.

[0006] When the movable core moves toward the fixed core, the shaft and the movable contact connected to the shaft will also move. With the moving action, the movable contact can move toward the fixed contact. When the movable contact and the fixed contact are in contact, the DC relay will be energized with the external power supply and load.

[0007] Reference Figure 1 and Figure 2 The conventional DC relay 1000 includes a frame portion 1100 , a contact portion 1200 , an actuator 1300 , and a movable contact moving portion 1400 .

[0008] The frame portion 1100 forms the outer shape of the DC relay 1000. A predetermined space is formed inside the frame portion 1100 so as to accommodate the contact portion 1200, the actuator 1300, and the movable contact moving portion 1400.

[0009] When the control power is turned on from the outside, the coil 1310 wound on the bobbin 1320 of the actuator 1300 generates an electromagnetic field. The fixed core 1330 and the movable core 1340 are magnetized by the electromagnetic field. The fixed core 1330 is fixed, so the movable core 1340 and the movable shaft 1350 connected to the movable core 1340 move toward the fixed core 1330.

[0010] At this time, the movable shaft 1350 is also connected to the movable contact 1220 of the contact portion 1200. Thus, due to the movement of the movable core 1340, the movable contact 1220 and the fixed contact 1210 come into contact and conduct electricity.

[0011] When the control power supply is released, the coil 1310 no longer forms an electromagnetic field. As a result, the electromagnetic attraction between the movable core 1340 and the fixed core 1330 disappears. The spring 1360 compressed by the movement of the movable core 1340 stretches, and the movable core 1340, the movable shaft 1350 connected thereto, and the movable contact 1220 move downward.

[0012] The movable contact 1220 is coupled to the movable contact moving part 1400. The movable contact moving part 1400 is configured to move in the up-down direction along with the movement of the movable core 1340.

[0013] The movable contact moving part 1400 includes: a movable contact supporting part 1410 for supporting the movable contact 1220; and an elastic part 1430 for elastically supporting the movable contact 1220. In addition, a movable contact cover 1420 is provided on the upper side of the movable contact 1220, and the movable contact cover 1420 is used to protect the movable contact 1220.

[0014] However, in such conventional movable contact moving part 1400 , movable contact 1220 is elastically supported only by elastic part 1430 . That is, no additional member is provided for preventing movable contact 1220 from being separated from movable contact moving part 1400 .

[0015] When the fixed contact 1210 and the movable contact 1220 are in contact, an electromagnetic reaction force is generated as current is passed through the fixed contact 1210 , and the reaction force may act to separate the movable contact 1220 from the fixed contact 1210 .

[0016] In this case, even when the control power source is turned on, there is a possibility that DC relay 1000 will not be energized, which may cause erroneous operation or failure.

[0017] Korean Patent No. 10-1216824 discloses a DC relay having a structure capable of preventing the separation of a movable contact and a fixed contact. Specifically, a DC relay having a structure in which an additional damping magnet for offsetting the electromagnetic reaction force generated between the movable contact and the fixed contact is arranged adjacent to the fixed contact is disclosed.

[0018] However, this type of DC relay has the limitation of only including structural elements for canceling electromagnetic force. That is, it is not easy to find a corresponding countermeasure for preventing the movable contact and the fixed contact from being separated arbitrarily due to incomplete cancellation of electromagnetic force.

[0019] Korean authorized invention document No. 20-0456811 discloses a DC relay having a structure capable of fastening a permanent magnet arranged adjacent to a fixed contact in a desired direction. Specifically, a DC relay having a structure in which a groove is formed in the permanent magnet and a protrusion is formed in a housing for accommodating the permanent magnet, so that the permanent magnet is accommodated only in a direction in which the groove and the protrusion are engaged.

[0020] However, this type of DC relay also has a limitation of including only structural elements for counteracting electromagnetic force.

[0021] Furthermore, the DC relay of the above type has a limitation that no corresponding countermeasure is provided for preventing the movable contact from being arbitrarily separated during the upward and downward movement of the movable contact.

[0022] Furthermore, the DC relay of the above type also fails to suggest a solution for concisely realizing the connection between the movable contact and the component arranged adjacent to the movable contact.

[0023] Korean authorized invention patent document No. 10-1216824 (2012.12.28.)

[0024] Korean Authorized Invention Document No. 20-0456811 (2011.11.21) Summary of the invention

[0025] Problem to be solved

[0026] An object of the present invention is to provide a DC relay having a structure capable of solving the above-mentioned problems and a method for manufacturing the same.

[0027] Firstly, an object of the present invention is to provide a DC relay and a method for manufacturing the same, which has a structure that can prevent a movable contact from being detached even if the movable contact moves up and down.

[0028] Furthermore, an object of the present invention is to provide a DC relay and a method for manufacturing the same, which has a structure capable of effectively counteracting the electromagnetic reaction force generated between a movable contact and a fixed contact.

[0029] Furthermore, an object of the present invention is to provide a DC relay and a method for manufacturing the same, which have a structure capable of achieving stable fastening of a member for offsetting an electromagnetic reaction force generated between a movable contact and a fixed contact and a movable contact.

[0030] Furthermore, an object of the present invention is to provide a DC relay and a method for manufacturing the same, which has a structure that does not require an additional component for fastening a component for offsetting the electromagnetic reaction force generated between a movable contact and a fixed contact to the movable contact.

[0031] Furthermore, an object of the present invention is to provide a DC relay and a method for manufacturing the same, which have a structure capable of achieving stable fastening of a member for accommodating a movable contact and a member for offsetting an electromagnetic reaction force.

[0032] Furthermore, an object of the present invention is to provide a DC relay and a method for manufacturing the same, which has a structure that can easily realize the combination between a component for preventing the movable contact from detaching and the movable contact, a component for accommodating the movable contact, and a component for offsetting the electromagnetic reaction force.

[0033] Technical solutions to the problem

[0034] In order to achieve the above-mentioned purpose, the present invention provides a DC relay, which includes: a fixed contact; a movable contact, which contacts with or separates from the fixed contact to allow or disconnect power; and a lower yoke, which is located on the lower side of the movable contact and offsets the electromagnetic reaction force generated between the fixed contact and the movable contact. A coupling protrusion with a predetermined diameter is protruded from the lower side surface of the movable contact, and a movable contact coupling portion is recessed at a predetermined distance on the upper side surface of the lower yoke. The movable contact coupling portion has a larger diameter than the coupling protrusion. After the coupling protrusion is inserted into the movable contact coupling portion, when pressure toward the radial outside is applied to the coupling protrusion, the coupling protrusion expands toward the radial outside and matches the movable contact coupling portion.

[0035] Furthermore, the lower yoke of the DC relay may include a yoke inner circumferential surface, which is constructed in a manner of surrounding the movable contact piece coupling portion and forms a part of the inner circumferential surface of the lower yoke, and when the coupling protrusion matches the movable contact piece coupling portion, the outer circumferential surface of the coupling protrusion contacts the yoke inner circumferential surface.

[0036] Furthermore, the DC relay may include an upper yoke, which is located on the upper side of the movable contact and offsets the electromagnetic reaction force generated between the fixed contact and the movable contact. When the fixed contact and the movable contact are in contact and power is allowed to be supplied, an electromagnetic attraction is generated between the upper yoke and the lower yoke.

[0037] And, the DC relay may include a housing located between the movable contact and the upper yoke.

[0038] Furthermore, the shell of the DC relay may have a shell through hole formed through it along the height direction, and the upper yoke through hole may have an upper yoke through hole formed through it along the height direction, the shell through hole has a larger diameter than the upper yoke through hole, and the shell through hole and the upper yoke through hole are arranged in a coaxial manner.

[0039] Furthermore, the DC relay may include a supporting member, which is extended along the height direction and penetrates and is combined with the shell through hole and the upper yoke through hole. After the supporting member penetrates and is combined with the shell through hole and the upper yoke through hole, when it is subjected to pressure radially outward, the outer peripheral surface of the supporting member contacts the inner peripheral surface of the upper yoke formed with the upper yoke through hole.

[0040] Furthermore, the DC relay may include a pin member, which is penetrated and connected to the supporting member and supports the movable contact, the pin member is extended in one direction and has a cross-section with a diameter larger than that of the upper yoke through hole, and the pin member includes: a first end portion, which constitutes one side end portion in the circumferential direction of the outer periphery of the pin member; and a second end portion, which is separated from the first end portion by a predetermined distance, is opposite to the first end portion, and constitutes the other side end portion in the circumferential direction of the outer periphery of the pin member.

[0041] Furthermore, when radially inward pressure is applied to the pin member of the DC relay, the distance between the first end and the second end can be reduced so that the diameter of the cross section of the pin member is smaller than the diameter of the upper yoke through hole.

[0042] Furthermore, the DC relay may include a housing, the housing being configured to cover the upper yoke, and the upper yoke being located between the movable contact and the housing.

[0043] Furthermore, the shell of the DC relay may have a shell through hole formed through it along the height direction, and the upper yoke through hole may have an upper yoke through hole formed through it along the height direction, the shell through hole has a larger diameter than the upper yoke through hole, and the shell through hole and the upper yoke through hole are arranged in a coaxial manner.

[0044] Furthermore, the DC relay may include a supporting member, which is extended along the height direction and penetrates and is combined with the shell through hole and the upper yoke through hole. When the supporting member is penetrated and combined with the shell through hole and the upper yoke through hole and is subjected to radial outward pressure, the outer peripheral surface of the supporting member contacts the inner peripheral surface of the upper yoke forming the upper yoke through hole.

[0045] Furthermore, the DC relay may include a pin member, which is inserted into and coupled to the movable contact and supports the movable contact, the pin member is extended in one direction and has a cross-section with a smaller diameter than the upper yoke through hole, the pin member including: a first end portion, which constitutes one side end portion in the circumferential direction of the outer periphery of the pin member; and a second end portion, which is separated from the first end portion by a predetermined distance, is opposite to the first end portion, and constitutes the other side end portion in the circumferential direction of the outer periphery of the pin member.

[0046] Furthermore, when radially inward pressure is applied to the pin member of the DC relay, the distance between the first end and the second end can be reduced so that the diameter of the cross section of the pin member is smaller than the diameter of the upper yoke through hole.

[0047] Furthermore, the present invention provides a method for manufacturing a DC relay, comprising: (a) step of combining an upper yoke and a housing; (b) step of penetrating and combining a supporting member through the upper yoke and the housing; and (c) step of applying radially outward pressure to the supporting member, thereby causing the supporting member to expand radially outward.

[0048] Furthermore, in the manufacturing method of the DC relay, after the step (c), the method includes: (d) a step of contacting the upper side of the lower yoke at the lower side of the movable contact; (e) a step of inserting the coupling protrusion of the movable contact into the movable contact coupling part of the lower yoke; and (f) a step of applying pressure toward the radially outward side to the coupling protrusion, thereby expanding the coupling protrusion toward the radially outward side.

[0049] Furthermore, in the manufacturing method of the DC relay, after the step (c), the method includes: a step (g) of applying pressure radially inward to the pin member to reduce the diameter of the pin member; a step (h) of penetrating and connecting the pin member to the support member; and a step (i) of releasing the pressure applied to the pin member to expand radially outward.

[0050] Technical Effects

[0051] According to the present invention, the following effects can be achieved.

[0052] First, a pin member is inserted and coupled to the movable contact. The pin member is configured to be spaced a predetermined distance from the movable contact.

[0053] Thus, the movable contact can move toward or away from the fixed contact while being penetrated by the pin member. In addition, since the pin member penetrates and is coupled to the movable contact and supports the movable contact, the movable contact can be prevented from being detached at will.

[0054] Furthermore, an upper yoke is arranged on the upper side of the movable contact piece, and a lower yoke is arranged on the lower side of the movable contact piece. When the movable contact piece and the fixed contact piece are energized, the upper yoke and the lower yoke are magnetized and an electromagnetic attraction is generated therebetween.

[0055] Therefore, even if an electromagnetic reaction force is generated between the movable contact and the fixed contact, the force can be offset by the electromagnetic attraction of the upper yoke and the lower yoke, thereby stably maintaining the contact state between the movable contact and the fixed contact.

[0056] Furthermore, a coupling protrusion is formed on the lower side of the movable contact. The coupling protrusion is inserted into the movable contact coupling part formed in the recess of the lower yoke. After the coupling protrusion is inserted into the movable contact coupling part, the coupling protrusion is pressed radially outward.

[0057] Thus, the coupling protrusion is expanded and its outer diameter is increased, so that it can be coupled to the movable contact coupling portion in a clamping manner. Thus, the movable contact and the lower yoke can be stably coupled. Furthermore, the movable contact and the lower yoke can be coupled without an additional fastening member.

[0058] The upper yoke and the housing are connected by a supporting member. The supporting member is configured to penetrate and connect the upper yoke and the housing. A base portion formed on the lower side of the supporting member is placed on the upper side of the movable contact.

[0059] Thereby, the upper yoke and the housing can be stably coupled together.

[0060] After the support member is connected to the upper yoke and the housing, it is subjected to pressure in a radially outward direction. The support member is configured to expand radially outward by using the pressure. As the support member expands radially outward, the outer peripheral surface of the support member can be connected to the inner peripheral surface of the upper yoke and the housing in a clamping manner.

[0061] Therefore, there is no need to provide an additional member for coupling the support member to the upper yoke and the housing.

[0062] Furthermore, the pin member is subjected to pressure in a radially inner direction before penetrating and engaging with the supporting member. A cutout portion is formed on the outer periphery of the pin member, so that the outer diameter of the pin member can be reduced under the effect of the pressure. When the pin member is penetrating and engaging with the supporting member, the applied pressure is released.

[0063] As a result, the pin member will return to its original shape and expand radially outward. As a result, the pin member can be clamped to the inside of the support member. As a result, the pin member and the support member can be combined without an additional fastening member. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 is a cross-sectional view of a DC relay in the prior art.

[0065] Figure 2 yes Figure 1 A three-dimensional view of a movable part assembly included in a DC relay.

[0066] Figure 3 It is a perspective view of a DC relay according to an embodiment of the present invention.

[0067] Figure 4 It is shown Figure 3 A cross-sectional view of the internal structure of a DC relay.

[0068] Figure 5 It is a perspective view of a movable contact part included in a DC relay according to an embodiment of the present invention.

[0069] Figure 6 yes Figure 5 An exploded perspective view of the movable contact portion of .

[0070] Figure 7 A is shown Figure 5 A sectional view of the movable contact part having an upper yoke and a housing before being combined, Figure 7 b is a cross-sectional view showing the state after bonding.

[0071] Figure 8 It is shown Figure 5A three-dimensional view of a movable contact portion in which an upper yoke and a housing are combined.

[0072] Fig. 9 A is shown Figure 5 A cross-sectional view of the movable contact part of the present invention showing a state before the upper yoke, the housing and the shaft body are combined, Fig. 9 b is a cross-sectional view showing the state after bonding.

[0073] Fig.10 A is shown Figure 5 A cross-sectional view of the movable contact part of the present invention showing a state before the upper yoke, the housing and the shaft body are combined, Fig.10 b is a perspective view showing the state after the combination.

[0074] Fig.11 A is shown Figure 5 A cross-sectional view of a movable contact part before the movable contact and the lower yoke are combined, Fig.11 b is a cross-sectional view showing the state after bonding.

[0075] Fig.12 A is shown Figure 5 A side view of a movable contact, a lower yoke, an upper yoke, a housing, and a shaft before being combined in a movable contact portion of the embodiment of the present invention. Fig.12 b is a side view showing the state after bonding.

[0076] Fig.13 A is shown Figure 5 A perspective view showing a state before the shape of a pin member included in a movable contact portion is deformed by external pressure, Fig.13 b is a perspective view showing the state after deformation.

[0077] Fig.14 A is shown Figure 5 A top view of a state before the shape of a pin member included in the movable contact portion is deformed by external pressure, Fig.14 b is a top view showing the situation after deformation.

[0078] Fig.15 A is shown Figure 5 A front cross-sectional view of a movable contact, a lower yoke, an upper yoke, a housing, a shaft, and a pin member before being combined in the movable contact portion of the embodiment of the present invention. Fig.15 b is a front cross-sectional view showing the state after bonding.

[0079] Fig.16 A is shown Figure 5 A side sectional view of a movable contact, a lower yoke, an upper yoke, a housing, a shaft, and a pin member before being combined in the movable contact portion of the embodiment of the present invention. Fig.16 b is a side sectional view showing the state after bonding.

[0080] Fig.17 A is shown Figure 5 A perspective view of a movable contact, a lower yoke, an upper yoke, a housing, a shaft, and a pin member before being combined in a movable contact portion of the embodiment of the present invention. Fig.17 b is a perspective view showing the state after the combination.

[0081] Fig.18 is a flow chart illustrating a method of incorporating a movable contact portion of an embodiment of the present invention.

[0082] Fig.19 It is shown Fig.18 A flowchart of the detailed steps of step S100 is shown in FIG.

[0083] Fig. 20 It is shown Fig.18 Flow chart of detailed steps of step S200.

[0084] Fig.21 It is shown Fig.18 Flow chart of detailed steps of step S300.

[0085] Fig. 22 It is shown Fig.18 Flow chart of detailed steps of step S400.

[0086] Fig.23 It is a perspective view of a movable contact part included in a DC relay according to another embodiment of the present invention.

[0087] Fig.24 yes Fig.23 An exploded perspective view of a movable contact portion of an embodiment of the present invention. DETAILED DESCRIPTION

[0088] Hereinafter, a DC relay according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0089] In the following description, in order to make the features of the present invention more clear, the description of some structural elements may be omitted.

[0090] 1. Definition of terms

[0091] When it is mentioned that a certain structural element is “connected to” or “contacting” another structural element, it may be directly connected to or contacting the other structural element, but it should be understood that other structural elements may exist between them.

[0092] On the contrary, when it is mentioned that a certain structural element is “directly connected to” or “directly in contact with” another structural element, it should be understood that there are no other structural elements between them.

[0093] Unless clearly indicated differently in the context, an expression in the singular number used in this specification includes an expression in the plural number.

[0094] 2. Description of the structure of the DC relay 1 of the embodiment of the present invention

[0095] Reference Figure 3 and Figure 4 The DC relay 1 according to the embodiment of the present invention includes a frame portion 10 , a switch portion 20 and a core portion 30 .

[0096] Furthermore, the DC relay 1 according to the embodiment of the present invention includes the movable contact portion 40 having a structure for improving the reliability of connecting and disconnecting the current.

[0097] Below, refer to Figure 3 and Figure 4 The DC relay 1 according to the embodiment of the present invention will be described, wherein the movable contact portion 40 will be described separately.

[0098] (1) Description of the frame portion 10

[0099] The frame 10 forms the outer side of the DC relay 1. A predetermined space is formed inside the frame 10. Various devices for performing the function of switching the DC relay 1 on or off can be accommodated in the space. That is, the frame 10 functions as a kind of housing.

[0100] The frame portion 10 may be formed of an insulating material such as synthetic resin to prevent the inside and outside of the frame portion 10 from being arbitrarily electrified.

[0101] The frame portion 10 includes an upper frame 11 , a lower frame 12 , an insulating plate 13 , and a support plate 14 .

[0102] The upper frame 11 forms the upper side of the frame portion 10. The upper frame 11 has an internal space that can accommodate the opening and closing portion 20 and the movable contact portion 40.

[0103] The upper frame 11 may be combined with the lower frame 12. An insulating plate 13 and a supporting plate 14 may be provided between the upper frame 11 and the lower frame 12. The insulating plate 13 and the supporting plate 14 are configured to separate the inner spaces of the upper frame 11 and the lower frame 12 electrically and physically.

[0104] On one side of the upper frame 11, in the illustrated embodiment, a fixed contact 22 of the switch 20 is provided. The fixed contact 22 is partially exposed on the upper side of the upper frame 11 so as to be electrically connected to an external power source or load.

[0105] The lower frame 12 forms a lower side of the frame portion 10. The lower frame 12 has an inner space in which the core 30 can be accommodated.

[0106] The lower frame 12 may be combined with the upper frame 11. An insulating plate 13 and a support plate 14 may be provided between the lower frame 12 and the upper frame 11. The insulating plate 13 and the support plate 14 are configured to separate the inner spaces of the lower frame 12 and the upper frame 11 electrically and physically.

[0107] The insulating plate 13 is located between the upper frame 11 and the lower frame 12. The insulating plate 13 is configured to electrically separate the upper frame 11 from the lower frame 12.

[0108] This can prevent any conduction of electricity between the opening and closing portion 20 and the movable contact portion 40 housed in the upper frame 11 and the core portion 30 housed in the lower frame 12 .

[0109] A through hole (not shown) is formed in the center of the insulating plate 13. The shaft 320 to which the lower assembly 300 is coupled passes through the through hole (not shown) so as to be movable in the vertical direction.

[0110] The insulating plate 13 may be supported on the supporting plate 14 .

[0111] The support plate 14 is located between the upper frame 11 and the lower frame 12. The support plate 14 is configured to physically separate the upper frame 11 and the lower frame 12.

[0112] Furthermore, the support plate 14 may be formed of a magnetic body to form a magnetic circuit together with the yoke 33 of the core 30 .

[0113] A through hole (not shown) is formed at the center of the support plate 14. A shaft 320 is inserted and coupled to the through hole (not shown) so as to be movable in the vertical direction.

[0114] (2) Description of the opening and closing portion 20

[0115] The switch unit 20 is configured to allow or interrupt the flow of current in the DC relay 1 according to the operation of the core unit 30. Specifically, the switch unit 20 can allow or interrupt the flow of current as the fixed contact 22 and the movable contact 210 come into contact or separate.

[0116] The opening and closing part 20 is accommodated in the upper frame 11. The opening and closing part 20 can be electrically and physically separated from the core part 30 by the insulating plate 13 and the supporting plate 14.

[0117] The opening and closing part 20 includes an arc chamber 21, a fixed contact 22, and a sealing member 23. Although not shown in the figure, the opening and closing part 20 may include a plurality of magnets. The plurality of magnets (not shown) may be configured to control the shape and discharge path of the arc (arc) generated by forming a magnetic field inside the arc chamber 21.

[0118] The arc chamber 21 is configured to extinguish the arc generated when the fixed contact 22 and the movable contact 210 are separated from each other. Therefore, the arc chamber 21 may also be referred to as an "arc extinguishing unit".

[0119] The arc chamber 21 is configured to contain the fixed contact 22 and the movable contact 210 in a sealed manner. That is, the fixed contact 22 and the movable contact 210 are completely contained in the arc chamber 21. Thus, the arc generated by the separation of the fixed contact 22 and the movable contact 210 can be prevented from leaking to the outside of the arc chamber 21 at will.

[0120] The arc chamber 21 may be filled with arc extinguishing gas. The arc extinguishing gas is used to extinguish the generated arc and may be discharged to the outside of the DC relay 1 through a predetermined path.

[0121] The arc chamber 21 may be formed of an insulating material. Also, the arc chamber 21 may be formed of a material having high pressure resistance and high heat resistance. In one embodiment, the arc chamber 21 may be formed of a ceramic material.

[0122] A plurality of through holes (not shown) may be formed on the upper side of the arc chamber 21. The fixed contacts 22 are respectively connected through the through holes (not shown). The fixed contacts 22 may be connected to the through holes (not shown) in a sealed manner. Thus, the generated arc is prevented from being discharged to the outside through the through holes (not shown).

[0123] The lower side of the arc chamber 21 may be open. The insulating plate 13 is in contact with the lower side of the arc chamber 21. In addition, the sealing member 23 is in contact with the lower side of the arc chamber 21. Thus, the arc chamber 21 can be electrically and physically separated from the outer space of the upper frame 11.

[0124] As a result, the interior of the arc chamber 21 is sealed by the insulating plate 13 , the support plate 14 , the fixed contact 22 , the sealing member 23 , and the shaft support member 310 of the movable contact portion 40 .

[0125] The arc extinguished in the arc chamber 21 is discharged to the outside of the DC relay 1 through a predetermined path.

[0126] The fixed contact 22 is configured to be in contact with or spaced apart from the movable contact 210 , thereby switching on or off the conduction of electricity between the inside and the outside of the DC relay 1 .

[0127] Specifically, when the fixed contact 22 is in contact with the movable contact 210, the DC relay 1 can be energized inside and outside. On the contrary, when the fixed contact 22 is separated from the movable contact 210, the DC relay 1 is disconnected from the inside and outside.

[0128] As can be seen from the name, the fixed contact 22 does not move. That is, the fixed contact 22 is fixedly coupled to the upper frame 11 and the arc chamber 21. Therefore, the contact and separation between the fixed contact 22 and the movable contact 210 are achieved by the movement of the movable contact 210.

[0129] One end portion of the fixed contact 22, the upper end portion in the illustrated embodiment, is exposed to the outside of the upper frame 11. A power source or a load is electrically connected to the one end portion.

[0130] There may be a plurality of fixed contacts 22. In the illustrated embodiment, a pair of fixed contacts 22 is provided, that is, two fixed contacts 22. One of the fixed contacts 22 may be connected to a power source in an electrically energized manner, and the other fixed contact 22 may be connected to a load in an electrically energized manner.

[0131] The other end of the fixed contact 22, the lower end in the illustrated embodiment, extends toward the movable contact 210. When the movable contact 210 moves upward, the lower end contacts the movable contact 210. Thus, the DC relay 1 can be energized both outside and inside.

[0132] The other end of the fixed contact 22 is located inside the arc chamber 21 . That is, the other end of the fixed contact 22 is closed by the arc chamber 21 .

[0133] When the control power is turned off, the movable contact 210 is separated from the fixed contact 22 by the elastic force of the return spring 36. At this time, as the fixed contact 22 and the movable contact 210 are separated, an arc is generated between the fixed contact 22 and the movable contact 210. The generated arc can be extinguished by the arc extinguishing gas inside the arc chamber 21 and discharged to the outside.

[0134] The sealing member 23 is configured to block the communication between the arc chamber 21 and the interior of the upper frame 11. The sealing member 23 closes the lower side of the arc chamber 21 together with the support plate 14.

[0135] Specifically, the lower side of the sealing member 23 is coupled to the support plate 14 . Also, the upper side of the sealing member 23 is coupled to the lower side of the arc chamber 21 .

[0136] Thus, the arc generated in the arc chamber 21 and the arc extinguished by the arc extinguishing gas do not flow into the internal space of the upper frame 11 .

[0137] Furthermore, the sealing member 23 blocks the communication between the internal space of the cylinder 37 and the internal space of the frame portion 10 .

[0138] (3) Description of the core 30

[0139] The core 30 is configured to move the movable contact part 40 upward as the control power is turned on. Furthermore, the core 30 is configured to move the movable contact part 40 downward again when the control power is turned off.

[0140] The core 30 can be electrically connected to the outside of the DC relay 1. The core 30 can receive the control power supplied from the outside by using the connection structure.

[0141] The core 30 is accommodated inside the lower frame 12. The core 30 and the opening and closing portion 20 may be electrically and physically separated from each other by the insulating plate 13 and the supporting plate 14.

[0142] The movable contact part 40 is arranged between the core part 30 and the switch part 20. The movable contact part 40 can move under the action of the moving force applied by the core part 30. As a result, the movable contact 210 and the fixed contact 22 come into contact, so that the DC relay 1 can be energized.

[0143] The core portion 30 includes a fixed core 31 , a movable core 32 , a yoke 33 , a bobbin 34 , a coil 35 , a return spring 36 , and a cylinder 37 .

[0144] The fixed core 31 is magnetized by the electromagnetic force generated in the coil 35 to generate an electromagnetic field. Under the electromagnetic field generated by the fixed core 31, the movable core 32 is attracted and moves toward the fixed core 31 (upper side in the illustrated embodiment).

[0145] The fixed core 31 does not move. That is, the fixed core 31 is fixedly coupled to the support plate 14 and the cylinder 37 .

[0146] The fixed core 31 may be formed of any member that can be magnetized by electromagnetic force. In one embodiment, the fixed core 31 may be formed of a permanent magnet or an electromagnet.

[0147] The fixed core 31 is partially accommodated in the upper space inside the cylinder 37 . The outer periphery of the fixed core 31 is in contact with the inner periphery of the cylinder 37 .

[0148] Also, the fixed core 31 is located between the support plate 14 and the movable core 32 .

[0149] A through hole (not shown) is formed in the center of the fixed core 31. The shaft 320 is inserted and coupled to the through hole (not shown) so as to be movable up and down.

[0150] The fixed core 31 and the movable core 32 are separated by a predetermined distance. The predetermined distance is a distance that the movable core 32 can move toward the fixed core 31. Therefore, the predetermined distance can be defined as a "movement distance of the movable core 32".

[0151] One end of the return spring 36 contacts the lower side of the fixed core 31. When the movable core 32 moves upward as the fixed core 31 is magnetized, the return spring 36 is compressed. Therefore, when the magnetization of the fixed core 31 is completed, the movable core 32 can be returned to the lower side again.

[0152] When the control power is turned on, the movable core 32 receives an electromagnetic force due to the electromagnetic field generated by the fixed core 31 and moves toward the fixed core 31 .

[0153] As the movable core 32 moves, the shaft 320 coupled to the movable core 32 moves upward. Also, as the shaft 320 moves, the movable contact portion 40 coupled to the shaft 320 moves upward. As a result, the fixed contact 22 and the movable contact 210 come into contact, and the DC relay 1 can be energized.

[0154] The movable core 32 may be provided in any form capable of receiving the attractive force caused by the electromagnetic force. In one embodiment, the movable core 32 may be composed of a permanent magnet or an electromagnet.

[0155] The movable core 32 is accommodated in the cylinder 37. The movable core 32 can move in the cylinder 37 in a direction toward the fixed core 31 and in a direction away from the fixed core 31, and in the embodiment shown in the figure, in an up-down direction.

[0156] The movable core 32 is combined with the shaft 320. The movable core 32 can move integrally with the shaft 320. When the movable core 32 moves to the upper side or the lower side, the shaft 320 will also move to the upper side or the lower side.

[0157] The movable core 32 is located at the lower side of the fixed core 31. The movable core 32 is spaced apart from the fixed core 31 by a predetermined distance. The predetermined distance may be defined as the moving distance of the movable core 32 as described above.

[0158] A predetermined space is formed inside the movable core 32. Specifically, the movable core 32 is formed to extend in one direction, and a hollow portion extending in one direction is formed inside the movable core 32.

[0159] The return spring 36 and the shaft 320 penetrating and coupled to the return spring 36 are partially accommodated in the hollow portion.

[0160] A protrusion 32a is formed on one side of the hollow portion opposite to the fixed core 31, protruding radially inwardly at the lower side in the illustrated embodiment. The protrusion 32a contacts one end of the return spring 36, at the lower end in the illustrated embodiment.

[0161] Furthermore, the protrusion 32a contacts the movable core support portion 323 formed on the lower side of the shaft body portion 322 of the shaft 320. Thus, when the movable core 32 moves upward, the shaft 320 can move upward together.

[0162] The yoke 33 forms a magnetic circuit when the control power is turned on. The magnetic circuit formed by the yoke 33 can be configured to adjust the direction of the electromagnetic field formed by the coil 35. Therefore, when the control power is turned on, the coil 35 can form an electromagnetic field in the direction in which the movable core 32 moves toward the fixed core 31.

[0163] The yoke 33 is accommodated in the lower frame 12. The yoke 33 is configured to surround the coil 35. The coil 35 may be accommodated in the yoke 33 at a predetermined distance from the inner peripheral surface of the yoke 33.

[0164] The yoke 33 accommodates the bobbin 34 therein. That is, the yoke 33, the coil 35, and the bobbin 34 around which the coil 35 is wound are arranged in order from the outer periphery of the lower frame 12 toward the radial inner side.

[0165] The upper side of the yoke 33 contacts the support plate 14 . Also, the outer periphery of the yoke 33 may contact the inner periphery of the lower frame 12 .

[0166] The coil 35 is wound around the bobbin 34 . The bobbin 34 is accommodated inside the yoke 33 .

[0167] The bobbin 34 may include: a flat plate-shaped upper portion and a lower portion; and a cylindrical column portion extending in one direction to connect the upper portion and the lower portion. That is, the bobbin 34 is in the shape of a bobbin.

[0168] The upper portion of the bobbin 34 is in contact with the lower side of the support plate 14 . Also, the lower portion of the bobbin 34 is in contact with the lower inner peripheral surface of the lower frame 12 .

[0169] The coil 35 is wound around the columnar portion of the bobbin 34. The thickness of the wound coil 35 may be configured to be the same as the diameter of the upper and lower portions of the bobbin 34.

[0170] A hollow portion extending in one direction is formed through the columnar portion of the bobbin 34. The cylinder 37 can be accommodated in the hollow portion.

[0171] The coil 35 generates an electromagnetic field when the control power is turned on. Under the effect of the electromagnetic field generated by the coil 35 , the fixed core 31 can be magnetized and an attractive force is applied to the movable core 32 .

[0172] The coil 35 is wound around the bobbin 34 . Specifically, the coil 35 is wound around the columnar portion of the bobbin 34 . The coil 35 is accommodated inside the yoke 33 .

[0173] When the control power is turned on, the coil 35 generates an electromagnetic field. At this time, the direction of the electromagnetic field generated by the coil 35 can be controlled by the yoke 33. Under the effect of the electromagnetic field generated by the coil 35, the fixed core 31 is magnetized.

[0174] When the fixed core 31 is magnetized, the movable core 32 receives an electromagnetic force, that is, an attractive force, in the direction toward the fixed core 31. As a result, the movable core 32 moves toward the fixed core 31, and moves upward in the illustrated embodiment.

[0175] The return spring 36 is used to provide a driving force that enables the movable core 32 to move away from the fixed core 31 when the control power is released after the movable core 32 moves toward the fixed core 31 .

[0176] As the movable core 32 moves toward the fixed core 31 , the return spring 36 is compressed and stores a restoring force.

[0177] At this time, the restoring force stored in the return spring 36 is preferably smaller than the attractive force exerted by the fixed core 31 on the movable core 32. Thus, during the period when the control power is turned on, the movable core 32 can be prevented from returning to the original position under the action of the return spring 36.

[0178] When the control power supply is released, only the restoring force of the return spring 36 is applied to the movable core 32. Thus, the movable core 32 can move in a direction away from the fixed core 31 and return to the original position.

[0179] The return spring 36 may be configured in any form that can be compressed and store a restoring force as the movable core 32 moves. In one embodiment, the return spring 36 may be configured as a coil spring.

[0180] The shaft 320 is connected through the return spring 36. The shaft 320 can move in the up-down direction independently of the return spring 36 when connected to the return spring 36.

[0181] The return spring 36 is accommodated in a hollow portion formed through the movable core 32. One end of the return spring 36 facing the fixed core 31 is supported by the lower side of the fixed core 31, and the upper end in the illustrated embodiment is supported by the lower side of the fixed core 31.

[0182] The other end of the return spring 36 opposite to the one end, the lower end in the illustrated embodiment, contacts and is supported by a protrusion 32 a formed on the lower side of the hollow portion of the movable core 32 .

[0183] The cylinder 37 accommodates the fixed core 31, the movable core 32, the coil 35, and the return spring 36. Inside the cylinder 37, the movable core 32 can move upward and downward.

[0184] The cylinder 37 is located in the hollow portion formed by the columnar portion of the bobbin 34. The upper end of the cylinder 37 contacts the lower side of the support plate 14. The side surface of the cylinder 37 contacts the inner peripheral surface of the columnar portion of the bobbin 34. The upper opening of the cylinder 37 is closed by the fixed core 31.

[0185] The cylinder 37 accommodates the shaft 320. Inside the cylinder 37, the shaft 320 can move upward or downward together with the movable core 32.

[0186] 3. Description of the movable contact portion 40 of one embodiment of the present invention

[0187] The DC relay 1 of the embodiment of the present invention includes a movable contact part 40. The movable contact part 40 is accommodated in the frame part 10, specifically, in the space inside the upper frame 11. Specifically, the movable contact part 40 is accommodated inside the arc chamber 21 accommodated inside the upper frame 11.

[0188] The fixed contact 22 is arranged above the movable contact portion 40. The movable contact portion 40 is accommodated inside the arc chamber 21 so as to be movable toward and away from the fixed contact 22 (up and down directions in the illustrated embodiment).

[0189] The core 30 is disposed below the movable contact portion 40. The movable contact portion 40 is accommodated so as to be movable toward and away from the fixed contact 22 (up and down directions in the illustrated embodiment) as the movable core 32 moves.

[0190] The movable contact portion 40 includes a movable contact 210. The movable contact 210 is configured to come into contact with or be spaced apart from the fixed contact 22 as the movable core 32 of the core portion 30 moves.

[0191] Furthermore, the movable contact portion 40 includes a fastening portion 400 for stably maintaining the coupled state of the components of the movable contact portion 40 in addition to a structure for bringing the fixed contact 22 and the movable contact 210 into contact with each other.

[0192] Below, refer to Figures 5 to 17 The movable contact portion 40 according to one embodiment of the present invention will be described in detail.

[0193] In the illustrated embodiment, the movable contact portion 40 includes an upper assembly 100 , a movable contact assembly 200 , a lower assembly 300 , and a fastening portion 400 .

[0194] (1) Description of upper assembly 100

[0195] The upper assembly 100 is located on the upper side of the movable contact portion 40 . The upper assembly 100 forms the upper portion of the movable contact portion 40 .

[0196] The upper assembly 100 is configured to surround the movable contact assembly 200 . The lower portion of the upper assembly 100 is coupled to the lower assembly 300 .

[0197] A fastening portion 400 is provided on the upper side of the upper assembly 100. The fastening portion 400 can stably couple the structural elements of the upper assembly 100.

[0198] The upper assembly 100 includes a housing 110 and an upper yoke 120 .

[0199] The housing 110 is configured to be coupled to the lower assembly 300 so as to house the movable contact assembly 200 .

[0200] The housing 110 is in the shape of a cuboid with taper edges.

[0201] The housing 110 has two opposite sides, the left side and the right side, which are open in the illustrated embodiment. Also, the housing 110 has an open bottom. That is, the housing 110 has a cross section in a rectangular shape with an open bottom. The movable contact assembly 200 can be inserted into the open space.

[0202] The housing 110 includes a first side surface 111 , a second side surface 112 , a housing plane 113 , a housing through hole 114 , and a housing space 115 .

[0203] The first side surface 111 forms a surface of the housing 110 that extends toward the lower assembly 300. In the illustrated embodiment, the first side surface 111 forms a surface on the front side. The first side surface 111 is opposite to the second side surface 112.

[0204] The first side surface 111 is configured to cover one side of the movable contact 210 accommodated in the housing space 115. Also, the first side surface 111 is configured to cover one side of the lower yoke 220 accommodated in the housing space 115.

[0205] A first bent portion 111 a is formed at one end portion of the first side surface 111 facing the lower assembly body 300 , that is, at the lower end portion in the illustrated embodiment.

[0206] The first bent portion 111a is a portion where the first side surface 111 is coupled to the lower assembly body 300. Specifically, the first bent portion 111a is inserted and coupled to a bent portion 312b forming the coupling slit 312 of the shaft support member 310.

[0207] The first bent portion 111a extends to form a predetermined angle with the first side surface 111. In the illustrated embodiment, the first bent portion 111a forms a predetermined angle with the first side surface 111 and extends outward, that is, forward in the illustrated embodiment.

[0208] On one side of the first bent portion 111a, a plurality of first fastening holes 111b are formed through the upper side in the illustrated embodiment. After the first side surface 111 is inserted and coupled to the coupling slit 312, a coupling fastening member (not shown) can be passed through the first fastening hole 111b. Thus, the fastening between the upper assembly 100 and the lower assembly 300 can be firmly maintained.

[0209] The second side surface 112 forms a surface of the housing 110 that extends toward the lower assembly 300 . In the illustrated embodiment, the second side surface 112 forms a surface on the rear side. The second side surface 112 is opposite to the first side surface 111 .

[0210] The second side surface 112 is configured to cover the other side opposite to the one side of the movable contact 210 accommodated in the housing space 115. Also, the second side surface 112 is configured to cover the other side opposite to the one side of the lower yoke 220 accommodated in the housing space 115.

[0211] A second bent portion 112 a is formed at one end portion of the second side surface 112 of the lower assembly body 300 , that is, at the lower end portion in the illustrated embodiment.

[0212] The second bent portion 112a is a portion where the second side surface 112 is coupled to the lower assembly body 300. Specifically, the second bent portion 112a is inserted and coupled to a bent portion 312b forming the coupling slit 312 of the shaft support member 310.

[0213] The second bent portion 112a extends to form a predetermined angle with the second side surface 112. In the illustrated embodiment, the second bent portion 112a forms a predetermined angle with the second side surface 112 and extends outward, that is, to the rear side in the illustrated embodiment.

[0214] On one side of the second bent portion 112a, a plurality of second fastening holes 112b are formed through the upper side in the illustrated embodiment. After the second side surface 112 is inserted and coupled to the coupling slit 312, a coupling fastening member (not shown) can be passed through the second fastening hole 112b. Thus, the fastening between the upper assembly 100 and the lower assembly 300 can be firmly maintained.

[0215] The first side surface 111 and the second side surface 112 are generally rectangular in shape. However, the width of the first side surface 111 and the second side surface 112 adjacent to the housing plane 113 may be smaller than the width of the portion adjacent to the lower assembly body 300 .

[0216] The first side surface 111 and the second side surface 112 are separated by a predetermined distance, which may be equal to or greater than the width of the movable contact 210 and the lower yoke 220 (the length in the front-to-back direction in the illustrated embodiment).

[0217] The housing plane 113 forms one side surface of the housing 110 , that is, the upper side surface in the illustrated embodiment. The housing plane 113 is configured to cover the upper side of the movable contact 210 accommodated in the housing space portion 115 .

[0218] The first side surface 111 and the second side surface 112 form a predetermined angle with the shell plane 113, and extend toward the lower assembly 300, respectively, and extend downward in the illustrated embodiment. In one embodiment, the angles formed by the first side surface 111 and the second side surface 112 and the shell plane 113 may be right angles.

[0219] The upper side of the housing plane 113 contacts the lower side of the upper yoke 120. The lower side of the housing plane 113 contacts the upper side of the movable contact 210. That is, the housing plane 113 is located between the upper yoke 120 and the movable contact 210.

[0220] The pin member 410 and the support member 420 of the fastening portion 400 are inserted through the housing through-hole 114 .

[0221] The housing through hole 114 is formed through the housing plane 113 . Specifically, the housing through hole 114 is formed through the housing plane 113 in the up-down direction.

[0222] In the illustrated embodiment, the housing through hole 114 is formed in a cylindrical shape with the center of the housing plane 113 as an axis. The shape of the housing through hole 114 may be changed according to the shape of the fastening portion 400.

[0223] The housing through hole 114 is preferably formed coaxially with an upper yoke through hole 124 formed through the upper yoke 120 . Also, the housing through hole 114 may be formed to have a larger diameter than the upper yoke through hole 124 .

[0224] The movable contact assembly 200 is inserted into the housing space 115. The housing space 115 may be defined as a space formed among the first side surface 111, the second side surface 112, the housing plane 113, and the shaft support member 310 of the lower assembly 300.

[0225] Specifically, the two sides of the housing 110 where the first side surface 111 and the second side surface 112 are not formed, that is, the left side and the right side in the illustrated embodiment, are formed in an open manner.

[0226] The movable contact assembly 200 may be accommodated in the housing space 115 through the open portion on the left or right side. In one embodiment, the movable contact assembly 200 may be moved and accommodated in the housing space 115 in a sliding manner.

[0227] The upper yoke 120 is configured to offset the electromagnetic reaction force that may be generated between the fixed contact 22 and the movable contact 210. Such an electromagnetic reaction force may be generated mainly when the fixed contact 22 and the movable contact 210 are in contact with each other.

[0228] Specifically, when the fixed contact 22 and the movable contact 210 are in contact and current is supplied, the upper yoke 120 is magnetized. As described later, the lower yoke 220 included in the movable contact assembly 200 is also magnetized as the fixed contact 22 and the movable contact 210 are in contact and current is supplied.

[0229] An electromagnetic attraction force is generated between the upper yoke 120 and the lower yoke 220. At this time, since the upper yoke 120 is fixedly coupled to the housing 110, the lower yoke 220 tends to move toward the upper yoke 120.

[0230] As described later, the lower yoke 220 is configured to support the movable contact 210 at the lower side. Therefore, as the lower yoke 220 receives electromagnetic attraction in the direction toward the upper yoke 120 , the movable contact 210 receives force in the direction toward the fixed contact 22 .

[0231] Therefore, even when an electromagnetic reaction force is generated between the fixed contact 22 and the movable contact 210 , the contact between the fixed contact 22 and the movable contact 210 can be stably maintained due to the electromagnetic attraction between the upper yoke 120 and the lower yoke 220 .

[0232] The upper yoke 120 may be formed of any shape that can be magnetized by electromagnetic force generated by current flow. In one embodiment, the upper yoke 120 may be formed of magnetizable iron, electromagnet, etc.

[0233] In the illustrated embodiment, the upper yoke 120 is disposed outside the housing 110. The upper yoke 120 is configured to surround the upper portion of the first side surface 111 and the second side surface 112 of the housing 110. Furthermore, the upper yoke 120 is configured to cover the housing plane 113 of the housing 110.

[0234] As described later, the movable contact portion 40 according to another embodiment of the present invention includes an upper yoke 130 provided inside the housing 110. This will be described in detail later.

[0235] The upper yoke 120 has a rectangular parallelepiped shape with chamfered corners.

[0236] The two sides of the upper yoke 120 facing each other are open on the left and right sides in the illustrated embodiment. Also, the lower side of the upper yoke 120 is open. That is, the cross section of the upper yoke 120 is a rectangular shape with an open lower side. The housing 110 can be combined in the open space.

[0237] The upper yoke 120 includes a first upper yoke side surface 121 , a second upper yoke side surface 122 , an upper yoke plane 123 , and an upper yoke through hole 124 .

[0238] The first upper yoke side surface 121 forms a surface of the upper yoke 120 that extends toward the lower assembly 300 or the housing 110. In the illustrated embodiment, the first upper yoke side surface 121 forms a front side surface. The first upper yoke side surface 121 is opposite to the second upper yoke side surface 122.

[0239] The first upper yoke side surface 121 is configured to partially cover the first side surface 111 . Specifically, the first upper yoke side surface 121 is configured to cover a portion of the first side surface 111 adjacent to the housing plane 113 .

[0240] The second upper yoke side surface 122 forms a surface of the upper yoke 120 that extends toward the lower assembly 300 or the housing 110. In the illustrated embodiment, the second upper yoke side surface 122 forms a rear side surface. The second upper yoke side surface 122 is opposite to the first upper yoke side surface 121.

[0241] The second upper yoke side surface 122 is configured to partially cover the second side surface 112. Specifically, the second upper yoke side surface 122 is configured to cover a portion of the second side surface 112 adjacent to the housing plane 113.

[0242] The first upper yoke side surface 121 and the second upper yoke side surface 122 have a rectangular shape as a whole, and are formed in a plate shape having a predetermined thickness.

[0243] The first upper yoke side surface 121 and the second upper yoke side surface 122 are separated by a predetermined distance which may be equal to or greater than the length of the housing plane 113 (the length in the front-rear direction in the illustrated embodiment).

[0244] The upper yoke plane 123 forms one surface of the upper yoke 120, the upper surface in the illustrated embodiment. The upper yoke plane 123 is configured to cover the upper side of the housing plane 113 of the housing 110. The lower side of the upper yoke plane 123 contacts the upper side of the housing plane 113.

[0245] The first upper yoke side surface 121 and the second upper yoke side surface 122 form a predetermined angle with the upper yoke plane 123, and are respectively extended in the direction toward the lower assembly 300, the lower side in the illustrated embodiment. In one embodiment, the angles formed by the first upper yoke side surface 121 and the second upper yoke side surface 122 and the upper yoke plane 123 may be right angles.

[0246] The upper side of the upper yoke plane 123 is configured to be separated from the inner surface of the arc chamber 21 by a predetermined distance. Even if the movable contact part 40 moves upward to make the fixed contact 22 and the movable contact 210 contact, the upper side of the upper yoke plane 123 and the inner surface of the arc chamber 21 do not contact. This is due to the shape of the movable contact 210 extending in the front-rear direction, and a detailed description of this will be described later.

[0247] The pin member 410 and the support member 420 of the fastening portion 400 are inserted through the upper yoke through-hole 124 .

[0248] The upper yoke through hole 124 is formed through the upper yoke plane 123. Specifically, the upper yoke through hole 124 is formed through the upper yoke plane 123 in the up-down direction.

[0249] In the illustrated embodiment, the upper yoke through hole 124 is formed in a cylindrical shape with the center of the upper yoke plane 123 as an axis. The shape of the upper yoke through hole 124 may be changed according to the shape of the fastening portion 400.

[0250] The upper yoke through-hole 124 is preferably formed coaxially with the housing through-hole 114. Also, the upper yoke through-hole 124 may be formed to have a smaller diameter than the housing through-hole 114.

[0251] With such a structure, the pin member 410 and the support member 420 inserted and coupled to the case through-hole 114 and the upper yoke through-hole 124 can be stably maintained in a coupled state.

[0252] (2) Description of the movable contact assembly 200

[0253] The movable contact assembly 200 includes a movable contact 210 that contacts or is spaced apart from the fixed contact 22 as the shaft 320 of the lower assembly 300 moves in the vertical direction. The movable contact assembly 200 is vertically movably accommodated in the housing space 115 of the housing 110 .

[0254] The upper assembly 100 is arranged on the upper side of the movable contact assembly 200 . Specifically, the upper side of the movable contact assembly 200 contacts the inner surface of the housing 110 .

[0255] The lower assembly 300 is disposed below the movable contact assembly 200. Specifically, the movable contact assembly 200 is elastically supported by the elastic member 330 of the lower assembly 300.

[0256] The movable contact assembly 200 includes a movable contact 210 and a lower yoke 220 .

[0257] When the control power is turned on, the movable contact 210 contacts the fixed contact 22, thereby energizing the DC relay 1 with the external power supply and load. When the control power is turned off, the movable contact 210 is separated from the fixed contact 22, thereby disconnecting the DC relay 1 from the external power supply and load.

[0258] The upper side of the movable contact 210 is in contact with the housing 110 . Specifically, the upper side of the movable contact 210 is in contact with the inner peripheral surface of the housing plane 113 .

[0259] The lower side of the movable contact 210 is in contact with the lower yoke 220. Specifically, the lower side of the movable contact 210 is in contact with the upper side surface of the lower yoke 220.

[0260] The movable contact 210 is formed to extend in one direction, that is, in the left and right directions in the illustrated embodiment. That is, the movable contact 210 is formed to be longer than its width.

[0261] Thus, when the movable contact 210 is accommodated in the housing space 115, both ends of the movable contact 210 in one direction are exposed outside the housing space 115. When the movable contact 40 moves upward, the both ends contact the fixed contact 22.

[0262] With such a structure, even if the movable contact part 40 moves upward, other parts except the movable contact 210 do not come into contact with the arc chamber 21 or the fixed contact 22 .

[0263] The width of the movable contact 210 may be formed to be the same as the width of the housing space 115. In other words, the width of the movable contact 210 may be formed to be the same as the predetermined distance between the first side surface 111 and the second side surface 112 of the housing 110.

[0264] Thus, when the movable contact 210 is accommodated in the housing space 115 , both side surfaces of the movable contact 210 in the width direction may be configured to contact the inner surfaces of the first side surface 111 and the second side surface 112 , respectively.

[0265] The thickness of the movable contact 210 may be formed smaller than the extension length of the first upper yoke side surface 131 and the second upper yoke side surface 132 of the upper yoke 120. In other words, when viewed from a cross section, the thickness of the movable contact 210 may be configured to be completely covered by the first upper yoke side surface 131 and the second upper yoke side surface 132 (see FIG. Fig.24 ).

[0266] With the structure described above, the upper yoke 120 can effectively counteract the electromagnetic reaction force generated between the fixed contact 22 and the movable contact 210 .

[0267] In one embodiment, the movable contact 210 can move up and down a predetermined distance from the inside of the housing space 115 together with the lower yoke 220 . The predetermined distance can be defined by the upper yoke 120 , the lower yoke 220 and the elastic member 330 .

[0268] The movable contact 210 includes a main body portion 211 , a protruding portion 212 , a supporting member receiving portion 213 , a pin member fastening hole 214 , and a coupling protruding portion 215 .

[0269] The main body 211 forms the main body of the movable contact 210. As described above, the main body 211 is formed to extend in one direction, that is, the left-right direction in the illustrated embodiment.

[0270] A protrusion 212 is formed at the center of the main body 211 in a direction that forms a predetermined angle with one direction, that is, in the front-rear direction in the illustrated embodiment.

[0271] The protrusion 212 is a portion of the movable contact 210 accommodated in the housing space 115 that contacts the inner surfaces of the first side surface 111 and the second side surface 112. That is, the protrusion 212 is a portion of the movable contact 210 accommodated in the housing space 115 that is clamped and coupled to the housing 110.

[0272] The protruding length of the protruding portion 212 is preferably determined according to the distance between the first side 111 and the second side 112. Specifically, the sum of the protruding length of each protruding portion 212 and the width of the main body 211 is preferably formed to be the same as the distance between the first side 111 and the second side 112.

[0273] With this structure, when the movable contact 210 is accommodated in the housing space 115 , it is possible to stably clamp and couple the movable contact 210 .

[0274] The support member 420 coupled to the fastening portion 400 is inserted into the support member receiving portion 213. As described above, the support member 420 is penetrated and coupled to the housing through hole 114 and the upper yoke through hole 124.

[0275] When the through-joining of the supporting member 420 is completed, the base portion 421 formed on the lower side of the supporting member 420 protrudes from the inner surface of the housing plane 113 .

[0276] The supporting member receiving portion 213 is formed to be recessed at a predetermined distance from the upper side surface of the main body portion 211 so that the base portion 421 of the penetrating supporting member 420 can be inserted.

[0277] In the illustrated embodiment, the support member receiving portion 213 is formed in a cylindrical shape having a circular cross section. The shape of the support member receiving portion 213 may be changed according to the shape of the support member 420 .

[0278] In the illustrated embodiment, the support member receiving portion 213 is formed with the center of the main body 211 as the central axis. The position of the support member receiving portion 213 can be changed, but it is preferably formed to have the same central axis as the housing through hole 114 and the upper yoke through hole 124.

[0279] The cross-sectional size of the support member receiving portion 213, that is, the diameter of the support member receiving portion 213 can be deformed. That is, as described later, when the lower yoke 220 is coupled to the lower side of the movable contact 210, the support member receiving portion 213 and the pin member fastening hole 214 are expanded by any tool.

[0280] As a result, the diameter of the supporting member receiving portion 213 will increase, so that the size of the cross section of the supporting member receiving portion 213 can be increased.

[0281] The supporting member receiving portion 213 is preferably formed such that the size of the cross section increased as described above is the same as the size of the base portion 421 of the supporting member 420 .

[0282] The pin member 410 of the fastening portion 400 is inserted through the pin member fastening hole 214. The pin member fastening hole 214 is formed to penetrate the main body portion 211 in one direction.

[0283] The pin member fastening hole 214 may be formed coaxially with the support member receiving portion 213. Thus, by coaxially coupling the pin member 410 and the support member 420, a stable coupling state can be maintained.

[0284] In the illustrated embodiment, the pin member fastening hole 214 is formed in a cylindrical shape having a circular cross section. The shape of the pin member fastening hole 214 may be changed according to the shape of the pin member 410 .

[0285] The cross-sectional size of the pin member fastening hole 214, that is, the diameter of the pin member fastening hole 214 can be deformed. That is, as described later, when the lower yoke 220 is coupled to the lower side of the movable contact 210, the pin member fastening hole 214 and the supporting member receiving portion 213 are expanded by an arbitrary tool.

[0286] As a result, the diameter of the pin member fastening hole 214 increases, and thus the size of the cross section of the pin member fastening hole 214 can be increased.

[0287] The pin member fastening hole 214 is preferably formed so that the size of the cross section increased as described above is larger than the diameter of the pin member 410. This is to prevent energization caused by the contact between the pin member 410 and the movable contact 210. In addition, this is to enable the movable contact 210 and the lower yoke 220 to move in the up-down direction by a predetermined distance, thereby preventing damage caused by fixed connection.

[0288] The coupling protrusion 215 is a portion where the lower yoke 220 is coupled to the movable contact 210. The coupling protrusion 215 is formed to protrude from the lower side surface of the movable contact 210 by a predetermined distance.

[0289] The protrusion distance of the coupling protrusion 215 may be formed to be greater than the height of the yoke inner peripheral surface 222 of the lower yoke 220 . That is, the lower end of the coupling protrusion 215 may be located below the yoke inner peripheral surface 222 .

[0290] The coupling protrusion 215 may be formed coaxially with the center of the main body 211. That is, the center axis of the coupling protrusion 215 may be coaxially arranged with the center axis of the main body 211. Thus, the coupling protrusion 215 is configured to be coaxially arranged with the housing through hole 114, the upper yoke through hole 124, the support member accommodating portion 213, and the pin member fastening hole 214.

[0291] A hollow portion is formed in the interior of the coupling protrusion 215 and is formed through the height direction. The hollow portion is connected to the supporting member receiving portion 213. That is, it can be considered that the hollow portion constitutes a part of the supporting member receiving portion 213.

[0292] The pin member 410 may be connected to the movable contact 210 in such a manner that one end portion thereof protrudes toward the lower side of the movable contact 210 through the hollow portion.

[0293] The coupling protrusion 215 may have a circular cross section. That is, the coupling protrusion 215 is formed to protrude from the lower side of the main body 211 in a direction toward the lower assembly 300 , that is, the lower side in the illustrated embodiment.

[0294] The coupling protrusion 215 includes a coupling outer peripheral surface 215a. The coupling outer peripheral surface 215a forms the outer side surface of the coupling protrusion 215. In the illustrated embodiment, the coupling protrusion 215 is cylindrical, and the coupling outer peripheral surface 215a can be defined as the side surface of the coupling protrusion 215.

[0295] The yoke inner peripheral surface 222 of the lower yoke 220 contacts the joint outer peripheral surface 215 a .

[0296] When the upper side of the lower yoke 220 contacts the lower side of the movable contact 210, the combined outer peripheral surface 215a and the yoke inner peripheral surface 222 are separated by a predetermined distance. At this time, as described above, the support member receiving portion 213 and the pin member fastening hole 214 of the movable contact 210 can be expanded by any tool.

[0297] By the expansion operation, the coupling outer peripheral surface 215a moves toward the yoke inner peripheral surface 222. As the expansion operation proceeds, the coupling outer peripheral surface 215a contacts the yoke inner peripheral surface 222. Thus, the movable contact 210 and the lower yoke 220 can be clamped and coupled without an additional member.

[0298] The lower yoke 220 is configured to offset the electromagnetic reaction force that may be generated between the fixed contact 22 and the movable contact 210. Such an electromagnetic reaction force may be generated mainly when the fixed contact 22 and the movable contact 210 are in contact.

[0299] Specifically, when the fixed contact 22 and the movable contact 210 are in contact and current is supplied, the lower yoke 220 is magnetized. As described above, the supply of current to the fixed contact 22 and the movable contact 210 also magnetizes the upper yoke 120.

[0300] An electromagnetic attraction is generated between the lower yoke 220 and the upper yoke 120. At this time, since the upper yoke 120 is fixedly coupled to the housing 110, the lower yoke 220 tends to move toward the upper yoke 120.

[0301] At this time, the lower yoke 220 is configured to support the movable contact 210 at the lower side. Specifically, the upper side surface of the lower yoke 220 is configured to contact the lower side surface of the movable contact 210. Therefore, when the lower yoke 220 is subjected to electromagnetic attraction in the direction toward the upper yoke 120, the lower yoke 220 will act on the movable contact 210 in the direction toward the upper yoke 120.

[0302] Therefore, even when the fixed contact 22 and the movable contact 210 come into contact and generate an electromagnetic reaction force, the electromagnetic attraction between the upper yoke 120 and the lower yoke 220 can stably maintain the contact between the fixed contact 22 and the movable contact 210 .

[0303] The lower yoke 220 may be formed of any shape that can be magnetized by electromagnetic force generated by energization. In one embodiment, the lower yoke 220 may be formed of magnetizable iron, electromagnet, etc.

[0304] The lower yoke 220 is in the shape of a rectangular parallelepiped extending in one direction, that is, in the illustrated embodiment, in the left and right directions. That is, the lower yoke 220 is formed to be longer than its width.

[0305] Thus, when the lower yoke 220 is accommodated in the housing space 115, both ends of the lower yoke 220 in one direction are exposed to the outside of the housing space 115. The both ends form electromagnetic attraction with the upper yoke 120.

[0306] With such a structure, even when electromagnetic reaction force is generated between the fixed contact 22 and the movable contact 210, the lower yoke 220 can cover most of the movable contact 210 in one direction. Thus, the contact state between the fixed contact 22 and the movable contact 210 can be stably maintained.

[0307] The lower yoke 220 may be extended to a shorter length than the movable contact 210 is extended to.

[0308] The lower yoke 220 has a protrusion formed in a direction that forms a predetermined angle with the one direction, in the front-rear direction in the illustrated embodiment, and the width of the lower yoke 220 including the protrusion may be formed to be the same as the width of the housing space 115 .

[0309] That is, the width of the lower yoke 220 including the protrusion may be formed to be the same as a predetermined distance at which the first side surface 111 and the second side surface 112 of the housing 110 are spaced apart from each other.

[0310] Thus, when the lower yoke 220 is accommodated in the housing space 115 , both side surfaces of the lower yoke 220 in the width direction can be configured to contact the inner surfaces of the first side surface 111 and the second side surface 112 . With such a structure, the lower yoke 220 can be stably accommodated in the housing space 115 .

[0311] In one embodiment, the lower yoke 220 can move a predetermined distance in the vertical direction from the inside of the housing space 115 together with the movable contact 210 . The predetermined distance can be defined by the upper yoke 120 , the lower yoke 220 and the elastic member 330 .

[0312] The lower side of the lower yoke 220 contacts the upper side of the elastic member 330. That is, the elastic member 330 does not directly contact the movable contact 210. Therefore, even if the elastic member 330 is repeatedly compressed and stretched, the movable contact 210 is not damaged.

[0313] The lower yoke 220 includes a movable contactor coupling portion 221 , a yoke inner peripheral surface 222 , an elastic member supporting portion 223 , and a main inner surface 224 .

[0314] The movable contactor coupling portion 221 is a space where the lower yoke 220 and the movable contactor 210 are coupled. Also, the coupling pin member 410 penetrates the movable contactor coupling portion 221 .

[0315] The movable contact engaging portion 221 is formed to be recessed by a predetermined distance from a surface of the movable contact 210 on a side of the lower yoke 220 , that is, an upper side surface in the illustrated embodiment.

[0316] The movable contact coupling part 221 communicates with the pin member fastening hole 214 of the movable contact 210. The pin member 410 passing through and coupled to the pin member fastening hole 214 can move toward the movable contact coupling part 221. The movable contact coupling part 221 can be formed with a larger diameter than the pin member fastening hole 214.

[0317] One end portion of the movable contact coupling portion 221 through which the pin member 410 is coupled may be located at a lower end portion in the illustrated embodiment than the lower side surface of the lower yoke 220 .

[0318] The movable contact coupling portion 221 may be formed to have the same central axis as the pin member fastening hole 214. Thus, the movable contact coupling portion 221 may be coaxially arranged with the housing through hole 114, the upper yoke through hole 124, the support member accommodating portion 213, and the pin member fastening hole 214.

[0319] The diameter of the movable contact engagement portion 221 is preferably determined according to the diameter of the expanded engagement protrusion 215 of the movable contact 210 .

[0320] That is, as described above, the diameter of the coupling protrusion 215 may increase as the support member receiving portion 213 and the pin member fastening hole 214 expand. At this time, the diameter of the movable contact coupling portion 221 may be formed to be the same as or smaller than the diameter of the coupling protrusion 215.

[0321] With such a structure, the lower yoke 220 can be combined with the movable contact 210 even without an additional member. A detailed description of this will be described later.

[0322] The yoke inner circumferential surface 222 is a portion in contact with the coupling outer circumferential surface 215 a . The yoke inner circumferential surface 222 may be defined as an upper inner circumferential surface of the lower yoke 220 .

[0323] As described above, before the support member accommodating portion 213 and the pin member fastening hole 214 are expanded, the diameter of the coupling protrusion 215 is smaller than the diameter of the movable contact coupling portion 221. Thus, the yoke inner peripheral surface 222 and the coupling outer peripheral surface 215a are arranged at a predetermined distance from each other.

[0324] When the support member receiving portion 213 and the pin member fastening hole 214 are expanded, the diameter of the coupling protrusion 215 increases, thereby causing the coupling outer peripheral surface 215 a to move toward the yoke inner peripheral surface 222 and contact the yoke inner peripheral surface 222 .

[0325] As a result, the lower yoke 220 can be coupled to the movable contact 210 without an additional member.

[0326] The elastic member support portion 223 is a space for accommodating the upper side of the elastic member 330 of the lower assembly 300. The elastic member support portion 223 is formed by being recessed from the lower side surface of the lower yoke 220 by a predetermined distance.

[0327] The elastic member support portion 223 is in communication with the movable contactor coupling portion 221 . Also, the elastic member support portion 223 is in communication with the support member accommodation portion 213 and the pin member fastening hole 214 of the movable contactor 210 .

[0328] Thus, the pin member 410 inserted into the movable contact 210 can pass through the lower yoke 220 and move forward.

[0329] The elastic member supporting portion 223 is formed in a cylindrical shape having a predetermined diameter. In the illustrated embodiment, the elastic member supporting portion 223 has a larger diameter than the movable contact coupling portion 221 .

[0330] When the expansion of the support member receiving portion 213 and the pin member fastening hole 214 is completed, the coupling outer peripheral surface 215a contacts the yoke inner peripheral surface 222. At this time, the protruding length of the coupling protrusion 215 is formed larger than the height of the yoke inner peripheral surface 222.

[0331] Thus, a lower portion of the outer peripheral surface 215a does not contact the yoke inner peripheral surface 222 and protrudes toward the elastic member support portion 223. At this time, a lower portion of the outer peripheral surface 215a and a main inner surface 224 of the lower yoke 220 defining the elastic member support portion 223 are separated by a predetermined distance.

[0332] As described later, the elastic member 330 has an elastic hollow portion 331 formed therein. When the elastic member 330 is accommodated in the elastic member support portion 223, a portion of the lower side of the coupling protrusion 215 is inserted into the elastic hollow portion 331. In addition, the main body of the elastic member 330 is accommodated in the elastic member support portion 223 formed radially outside the coupling protrusion 215.

[0333] Thus, the elastic member 330 may be stably accommodated in the elastic member supporting portion 223 .

[0334] The main inner surface 224 is an inner surface for defining the elastic member support portion 223. The main inner surface 224 may be defined as a lower inner circumferential surface of the inner circumferential surface of the lower yoke 220. The main inner surface 224 may contact the outer circumferential surface of the elastic member 330.

[0335] (3) Description of Lower Assembly 300

[0336] The lower assembly 300 forms the lower side of the movable contact part 40. In addition, the lower assembly 300 is configured to be connected to the core part 30 so as to transmit the driving force generated by the movable core 32 or the return spring 36 to the movable contact part 40. The driving force transmitted by the lower assembly 300 moves the movable contact part 40 upward or downward. Thus, the fixed contact 22 and the movable contact 210 can be in contact with or spaced apart from each other.

[0337] The lower assembly 300 and the upper assembly 100 are combined to form a predetermined space, which may be defined as a housing space 115. The movable contact assembly 200 may be accommodated in the housing space 115.

[0338] The upper assembly 100 and the movable contact assembly 200 are arranged on the upper side of the lower assembly 300. The core 30 is arranged on the lower side of the lower assembly 300. The movement of the core 30, that is, the movement of the movable core 32 or the movement of the return spring 36 can be transmitted to the lower assembly 300.

[0339] The lower assembly 300 includes a shaft support member 310 , a shaft 320 , and an elastic member 330 .

[0340] The shaft support member 310 forms a main body of the lower assembly 300. The housing 110 of the upper assembly 100 is coupled to the shaft support member 310.

[0341] The shaft support member 310 supports the lower side of the elastic member 330. Furthermore, the shaft 320 is coupled to the shaft support member 310, so that the lower assembly 300 can be moved by the movable core 32 and the return spring 36.

[0342] The shaft supporting member 310 forms a predetermined space with the housing 110 and is combined.

[0343] The shaft support member 310 has a rectangular parallelepiped shape extending in one direction, the front-rear direction in the illustrated embodiment.

[0344] The shaft supporting member 310 includes a housing coupling portion 311 , a coupling slit 312 , an elastic member accommodating portion 313 , an elastic member coupling portion 314 , and a shaft coupling portion 315 .

[0345] The housing coupling portion 311 is a portion where the housing 110 is coupled to the shaft supporting member 310. Specifically, the housing coupling portion 311 couples the lower end of the first side surface 111 and the lower end of the second side surface 112.

[0346] The housing coupling part 311 protrudes from both ends of the shaft support member 310 in one direction, the front and rear ends in the illustrated embodiment, and protrudes toward one side of the housing 110, the upper side in the illustrated embodiment.

[0347] Thus, the space between the housing coupling parts 311 located at the front side and the rear side has a shape that is recessed compared to the housing coupling part 311. The space may be defined as an elastic member receiving part 313.

[0348] The distance between the housing joints 311 may be greater than the length of the housing space 115 in the front-rear direction. That is, the distance between the outer sides of the housing joints 311 may be greater than the distance between the first side surface 111 and the second side surface 112 .

[0349] As the housing coupling portion 311 is formed to protrude, a sufficient depth for coupling the lower end of the first side surface 111 and the lower end of the second side surface 112 can be ensured.

[0350] The lower end of the first side surface 111 and the lower end of the second side surface 112 are inserted and coupled to the coupling slit 312. The coupling slit 312 is formed to be recessed at a predetermined distance in each housing coupling portion 311.

[0351] The distance between the coupling slits 312 may be formed to be the same as the length of the housing space 115 in the front-rear direction. That is, the distance between the coupling slits 312 may be formed to be the same as the distance between the first side surface 111 and the second side surface 112 .

[0352] The shape of the coupling slit 312 may be determined according to the shapes of the first side surface 111 and the second side surface 112 .

[0353] The coupling slit 312 includes a vertical portion 312a and a bent portion 312b. The vertical portion 312a is formed on one side of the housing coupling portion 311, and the upper side surface in the illustrated embodiment is recessed by a predetermined distance.

[0354] The vertical portion 312a may be formed by being recessed in a manner perpendicular to the upper side surface of each housing coupling portion 311. The vertical portion 312a is connected to the bent portion 312b.

[0355] The bent portion 312b and the vertical portion 312a form a predetermined angle and are recessed at a predetermined distance. The predetermined angle formed by the bent portion 312b and the vertical portion 312a may be the same as the predetermined angle formed by the first side surface 111 and the first bent portion 111a. Furthermore, the predetermined angle formed by the bent portion 312b and the vertical portion 312a may be the same as the predetermined angle formed by the second side surface 112 and the second bent portion 112a.

[0356] The bent portion 312b is connected to the vertical portion 312a, so that the first side surface 111 and the second side surface 112 can pass through the vertical portion 312a and be inserted into and combined with the bent portion 312b.

[0357] With the formation of the bent portion 312 b , the coupled state between the housing 110 and the shaft support member 310 can be stably maintained compared to the case where only the vertical portion 312 a is formed.

[0358] The elastic member receiving portion 313 is a space for receiving the elastic member 330 . The elastic member receiving portion 313 is formed between the housing coupling portions 311 .

[0359] The upper boundary of the elastic member receiving portion 313 may be defined by the movable contact 210 and the lower yoke 220 . Also, the front-rear boundary of the elastic member receiving portion 313 may be defined by the first side surface 111 and the second side surface 112 .

[0360] That is, the elastic member accommodation portion 313 may be defined as a space surrounded by the housing 110 , the movable contact 210 , the lower yoke 220 , and the shaft support member 310 .

[0361] The elastic member coupling part 314 supports the lower side of the elastic member 330 accommodated in the elastic member accommodating part 313. Specifically, the elastic member coupling part 314 is inserted and coupled to the elastic hollow part 331 of the elastic member 330. Thus, the elastic member 330 can be prevented from being detached from the elastic member accommodating part 313 at will.

[0362] The elastic member coupling portion 314 is formed to protrude upward from the surface of one side of the shaft support member 310, the upper surface in the illustrated embodiment. In the illustrated embodiment, the elastic member coupling portion 314 is a cylindrical shape with a circular cross section. The diameter of the elastic member coupling portion 314 is preferably formed to be the same as or smaller than the diameter of the elastic hollow portion 331.

[0363] The shaft coupling portion 315 is a space where the head portion 321 of the shaft 320 and a part of the shaft body portion 322 are coupled. The shaft coupling portion 315 is formed inside the shaft supporting member 310 .

[0364] In one embodiment, the shaft coupling portion 315 and the shaft 320 may be formed as one body. In the embodiment, the shaft coupling portion 315 and the shaft 320 may be formed by insert injection.

[0365] The shaft 320 coupled to the shaft coupling portion 315 can move integrally with the shaft supporting member 310. Therefore, when the shaft 320 moves upward or downward, the shaft supporting member 310 can also move upward or downward.

[0366] The shaft 320 transmits the driving force generated by driving the core 30 to the movable contact part 40. The shaft 320 is formed to extend in one direction, that is, the up-down direction in the illustrated embodiment.

[0367] The shaft 320 is coupled to the shaft supporting member 310 . Specifically, the upper side of the shaft 320 is coupled to the shaft coupling portion 315 .

[0368] The shaft 320 is combined with the core 30 . Specifically, the lower side of the shaft 320 may contact the protrusion 32 a of the movable core 32 , so that the shaft 320 moves together with the movable core 32 .

[0369] The shaft 320 is coupled to the fixed core 31 in a manner that it can move up and down. In addition, the shaft 320 is penetrated and coupled with the return spring 36 .

[0370] The shaft 320 includes a head portion 321 , a shaft body portion 322 , and a movable core support portion 323 .

[0371] The head portion 321 forms an upper side of the shaft 320. The head portion 321 may be formed in a circular plate shape. The diameter of the head portion 321 may be formed larger than the diameter of the shaft body portion 322.

[0372] The head 321 is inserted and coupled to the shaft coupling portion 315. Due to the shape of the head 321, the shaft 320 is prevented from being detached from the shaft coupling portion 315 at will.

[0373] The shaft body 322 extends to the lower side of the head 321. The shaft body 322 forms a main body of the shaft 320. The shaft body 322 is formed to extend in one direction.

[0374] The shaft body 322 is connected to the fixed core 31 in a manner that it can move in the vertical direction.

[0375] The movable core support part 323 is arranged at the lower end of the shaft body part 322. The movable core support part 323 has a smaller diameter than the shaft body part 322. The movable core support part 323 can be inserted into a space formed by the projections 32a coupled to the movable core 32 being spaced apart from each other.

[0376] That is, one end of the shaft body 322 adjacent to the movable core support portion 323 is supported by the protrusion 32a of the movable core 32. Thus, when the movable core 32 moves upward, the shaft 320 pushed by the protrusion 32a can move upward together with the movable core 32.

[0377] The shaft body 322 is penetrated and coupled with the return spring 36. The lower end of the return spring 36 is supported by the protrusion 32a of the movable core 32. Therefore, when the movable core 32 moves upward, the return spring 36 is compressed and stores a restoring force.

[0378] When the control power is released, the movable core 32 is not subjected to the electromagnetic attraction force from the fixed core 31. At this time, the movable core 32 moves downward by the restoring force stored in the return spring 36. Thus, the shaft 320 can also move downward together with the movable core 32.

[0379] The elastic member 330 can prevent the fixed contact 22 and the movable contact 210 from being randomly separated due to the electrostatic reaction force. To this end, the elastic member 330 is configured to elastically support the movable contact assembly 200 at the lower side of the lower yoke 220.

[0380] The elastic member 330 is accommodated in the elastic member accommodation portion 313. The lower side of the elastic member 330 accommodated in the elastic member accommodation portion 313 is supported by the upper side of the shaft support member 310. Also, the upper side of the elastic member 330 contacts the elastic member support portion 223, thereby elastically supporting the lower yoke 220 and the movable contact piece 210.

[0381] The elastic member 330 may be configured in any form that can be compressed or stretched to store a restoring force and can transmit the restoring force stored by being stretched or compressed to the outside. In one embodiment, the elastic member 330 may be configured as a coil spring.

[0382] The elastic member 330 includes an elastic hollow portion 331. The elastic hollow portion 331 is a space formed through the elastic member 330.

[0383] The coupling protrusion 215 is inserted into the upper side of the elastic hollow portion 331. Also, the elastic member coupling portion 314 is inserted into the lower side of the elastic hollow portion 331. Thus, the elastic member 330 can be stably accommodated in the elastic member accommodation portion 313 without being detached at will.

[0384] (4) Description of the Fastening Section 400

[0385] The fastening portion 400 is configured to firmly fasten each component of the upper assembly 100 . Also, the fastening portion 400 prevents the movable contact 210 from being detached from the movable contact portion 40 arbitrarily.

[0386] The fastening portion 400 may be coupled to the movable contact portion 40 in an interference fit manner. That is, the fastening portion 400 may be coupled to the movable contact portion 40 by utilizing its own shape deformation without an additional fastening member.

[0387] The fastening portion 400 includes a pin member 410 and a supporting member 420 .

[0388] The pin member 410 is configured to prevent the movable contact 210 from being detached from the movable contact portion 40. To this end, the pin member 410 is sequentially connected to and penetrates the upper yoke 120, the housing 110, the movable contact 210, and the lower yoke 220.

[0389] Specifically, the pin member 410 is formed through the upper yoke through hole 124, the housing through hole 114, the pin member fastening hole 214 and the movable contact member coupling portion 221. The pin member 410 can be inserted to one end thereof, and the lower end in the illustrated embodiment is accommodated in the elastic hollow portion 331.

[0390] Thus, the pin member 410 can prevent the movable contact 210 from being arbitrarily separated from the housing space portion 115 .

[0391] A support member 420 is provided radially outside the pin member 410. The pin member 410 is coupled to the support member 420 in a clamping manner.

[0392] That is, the support member 420 penetrates and is inserted and coupled to the upper yoke 120, the housing 110, and the movable contact 210. The pin member 410 penetrates and is coupled to the first hollow portion 423 and the second hollow portion 424 formed inside the support member 420. That is, the coupling of the pin member 410, the upper yoke 120, and the housing 110 is achieved through the support member 420.

[0393] The pin member 410 is formed to extend in one direction. In the illustrated embodiment, the pin member 410 is in the shape of a cylinder having a circular cross section, but the shape may be changed.

[0394] As described later, the shape of the pin member 410 can be deformed by the pressure toward the radial inner side. And when the applied pressure is released, the pin member 410 can be restored toward the radial outer side (refer to Fig.13 and Fig.14 ).

[0395] To this end, the pin member 410 may be formed of a material having a predetermined elasticity. In one embodiment, the pin member 410 may be formed of iron or stainless steel.

[0396] The diameter of the pin member 410 in a state where no radially inward pressure is applied is preferably formed larger than the diameter of the second hollow portion 424 of the support member 420 .

[0397] Also, the diameter of the pin member 410 in a state where a radially inner pressure is applied is preferably formed to be the same as or smaller than the diameter of the second hollow portion 424 of the support member 420 .

[0398] The pin member 410 includes a cutout portion 411 , a hollow portion 412 , and an outer peripheral portion 413 .

[0399] The cutout portion 411 is a space that can compress the outer peripheral portion 413 of the pin member 410 radially inward when the pin member 410 is subjected to radially inward pressure. The cutout portion 411 is formed to be open along the one direction of the pin member 410 .

[0400] As the name indicates, the cutout portion 411 is formed by cutting off a portion of the outer circumference 413 of the pin member 410. In one embodiment, the cutout portion 411 may be formed by cutting off a portion of the outer circumference 413.

[0401] The cut portion 411 may be defined by a first end portion 411 a and a second end portion 411 b. The first end portion 411 a is an end portion on one side of the outer peripheral portion 413 in the circumferential direction. The second end portion 411 b is an end portion on the other side of the outer peripheral portion 413 in the circumferential direction.

[0402] The first end 411a and the second end 411b are opposite to each other. Furthermore, the first end 411a and the second end 411b are configured to be spaced apart from each other by a predetermined distance. The cutout portion 411 may be defined by a space formed by the first end 411a and the second end 411b being spaced apart from each other.

[0403] When a radially inward pressure is applied to the pin member 410 , the outer peripheral portion 413 is compressed radially inward and deformed. At this time, the displacement of the outer peripheral portion 413 caused by the compression is compensated by the cut portion 411 .

[0404] Furthermore, the circumferential length of the cut portion 411 , that is, the distance between the first end portion 411 a and the second end portion 411 b , may be determined according to the diameter of the second hollow portion 424 of the support member 420 .

[0405] That is, when the pin member 410 is compressed, the first end 411a and the second end 411b move toward each other, thereby reducing the diameter of the pin member 410. At this time, the maximum distance that the pin member 410 can be compressed can be determined by the distance between the first end 411a and the second end 411b, that is, the circumferential length of the cut portion 411.

[0406] Therefore, the circumferential length of the cutout portion 411 is preferably determined so that the diameter of the pin member 410 deformed in shape by the pressure directed radially inward is equal to or smaller than the diameter of the second hollow portion 424 .

[0407] Meanwhile, the circumferential length of the cutout portion 411 is preferably formed such that, when no radially inward pressure is applied to the pin member 410 , the diameter of the pin member 410 is larger than the diameter of the second hollow portion 424 .

[0408] Thus, the pin member 410 can penetrate and couple to the second hollow portion 424 while being deformed in shape due to the pressure toward the radial inner side. Furthermore, after the pin member 410 is coupled, when the pressure toward the radial inner side is released, the shape of the pin member 410 can be deformed toward the radial outer side. Thus, the pin member 410 and the support member 420 can be coupled in an interference fit manner, thereby achieving a secure fastening.

[0409] The hollow portion 412 is a space formed inside the pin member 410. The hollow portion 412 is formed to penetrate along the one direction of the pin member 410. With the formation of the hollow portion 412, the rigidity of the pin member 410 in the one direction can be improved.

[0410] Also, as the hollow portion 412 is formed, when pressure toward the radially inner side is applied to the pin member 410 , the shape of the outer peripheral portion 413 may be deformed.

[0411] The outer peripheral portion 413 forms the outer periphery, ie, the outer side boundary of the pin member 410. The pin member 410 in the illustrated embodiment is cylindrical, and the outer peripheral portion 413 can be defined as a side surface of the pin member 410.

[0412] The outer peripheral portion 413 is formed in a discontinuous manner. That is, a portion of the outer peripheral portion 413 is cut off. The cut off portion may be defined as a cutout portion 411. The cutout portion 411 may be defined as a space between a first end portion 411a and a second end portion 411b of the outer peripheral portion 413.

[0413] The outer surface of the outer peripheral portion 413 may be defined as an outer peripheral surface 413a. The outer peripheral surface 413a forms the outer side surface of the pin member 410. When the pin member 410 is coupled to the support member 420, the outer peripheral surface 413a contacts the pin member contact surface 425 forming the second hollow portion 424.

[0414] At this time, as described above, the pin member 410 is coupled to the support member 420 in a state where its diameter is reduced due to the radially inward pressure. Thus, the outer peripheral surface 413a applies radially outward pressure to the pin member contact surface 425 and contacts the pin member contact surface 425.

[0415] Thus, the pin member 410 and the support member 420 may be combined in an interference fit manner, thereby stably maintaining a combined state.

[0416] The support member 420 stably combines the housing 110 and the upper yoke 120. In addition, the pin member 410 penetrates and is coupled to the support member 420. The support member 420 and the pin member 410 are coupled in an interference fit manner to prevent the pin member 410 penetrating and coupled in the support member 420 from being detached at will.

[0417] The support member 420 is located on the upper side of the upper assembly 100. Specifically, the support member 420 penetrates and is coupled to the housing 110 and the upper yoke 120. Also, the support member 420 is inserted and coupled to the movable contact 210.

[0418] At this time, the shape of the supporting member 420 itself is deformed, so that it is combined with the housing 110, the upper yoke 120 and the movable contact 210 in an interference fit manner.

[0419] In the illustrated embodiment, the support member 420 has a circular cross section and extends in the vertical direction. The shape of the support member 420 can be changed accordingly with the shapes of the housing through hole 114, the upper yoke through hole 124 and the support member receiving portion 213 to which the support member 420 is coupled.

[0420] The supporting member 420 includes a base portion 421 , a boss portion 422 , a first hollow portion 423 , a second hollow portion 424 , and a pin member contact surface 425 .

[0421] The base portion 421 forms one side of the support member 420, the lower side in the illustrated embodiment. The base portion 421 may be formed in the form of a disk having a predetermined thickness. The shape of the base portion 421 may be changed in accordance with the shape of the support member receiving portion 213.

[0422] The base portion 421 is inserted and coupled to the supporting member receiving portion 213. A side surface of the base portion 421 facing the movable contact 210, that is, a lower side surface in the illustrated embodiment, contacts the movable contact 210.

[0423] The other side surface of the base portion 421 opposite to the one side surface, the upper side surface in the illustrated embodiment, contacts the housing plane 113 of the housing 110 . That is, the base portion 421 is located between the housing plane 113 and the movable contact 210 .

[0424] The boss portion 422 is formed to protrude at a predetermined distance from a surface of the base portion 421 on one side facing the movable contact piece 210 , that is, an upper side surface in the illustrated embodiment.

[0425] The boss portion 422 is a portion of the support member 420 that penetrates and is coupled to the housing 110 and the upper yoke 120. Specifically, the boss portion 422 penetrates and is coupled to the housing through hole 114 and the upper yoke through hole 124.

[0426] The protruding distance of the boss portion 422 is preferably determined to be greater than the sum of the thicknesses of the housing plane 113 and the upper yoke plane 123. That is, a portion of the boss portion 422 may protrude to the outside of the upper yoke plane 123.

[0427] The boss portion 422 is cylindrical and extends in the up-down direction. The shape of the boss portion 422 can be changed according to the shapes of the housing through-hole 114 and the upper yoke through-hole 124 .

[0428] A first hollow portion 423 and a second hollow portion 424 are formed inside the boss portion 422 along the height direction of the boss portion 422. The first hollow portion 423 may be defined by a boss portion inner peripheral surface 422a forming the inner peripheral surface of the boss portion 422.

[0429] The first hollow portion 423 is a space formed inside the boss portion 422. The first hollow portion 423 is defined by the boss portion inner peripheral surface 422a. That is, the first hollow portion 423 is a space surrounded by the boss portion inner peripheral surface 422a.

[0430] The first hollow portion 423 penetrates the coupling pin member 410. The first hollow portion 423 communicates with the second hollow portion 424. The first hollow portion 423 may be defined as a space formed on an upper side of the second hollow portion 424.

[0431] The first hollow portion 423 has a larger diameter than the second hollow portion 424. As described later, this is to facilitate smooth insertion of any tool for radially expanding the first hollow portion 423 and the second hollow portion 424 outward.

[0432] The second hollow portion 424 is a space located below the first hollow portion 423. The second hollow portion 424 is communicated with the first hollow portion 423.

[0433] The second hollow portion 424 is a space formed inside the base portion 421 and the boss portion 422. The second hollow portion 424 is defined by the pin member contact surface 425. That is, the second hollow portion 424 is a space surrounded by the pin member contact surface 425.

[0434] The second hollow portion 424 is penetrated by the connecting pin member 410. When the connecting pin member 410 is penetrated by the second hollow portion 424, the outer peripheral surface 413a of the pin member 410 contacts the pin member contact surface 425. As described above, the outer peripheral surface 413a applies radially outward pressure to the pin member contact surface 425 and contacts the pin member contact surface 425.

[0435] Any tool may be inserted into the first hollow portion 423. In one embodiment, the tool may be a circular ring punch.

[0436] The arbitrary tool may be inserted into the second hollow portion 424 after being inserted into the first hollow portion 423. The arbitrary tool may be configured to apply pressure to the first hollow portion 423 and the second hollow portion 424 toward the radially outer side.

[0437] As a result, the first hollow portion 423 and the second hollow portion 424 expand radially outwards, and at the same time, the outer peripheries of the base portion 421 and the boss portion 422 also expand radially outwards.

[0438] At this time, the base portion 421 expands until its upper side contacts the lower side of the housing plane 113. At the same time, the boss portion 422 expands until its outer peripheral surface contacts the inner peripheral surface of the upper yoke plane 123 defining the upper yoke through hole 124.

[0439] Thus, even without an additional fastening member, the housing 110 , the upper yoke 120 , and the support member 420 can be stably fastened by utilizing the shape deformation of the support member 420 .

[0440] The pin member contact surface 425 may be defined as an inner circumferential surface of the support member 420 surrounding the second hollow portion 424. The pin member contact surface 425 has a height longer than the base portion 421.

[0441] The pin member contact surface 425 is located radially inwardly of the boss portion inner peripheral surface 422a. That is, the second hollow portion 424 defined by the pin member contact surface 425 has a smaller diameter than the first hollow portion 423 defined by the boss portion inner peripheral surface 422a.

[0442] 4. Description of the method for manufacturing the movable contact portion 40 according to the embodiment of the present invention

[0443] The movable contact part 40 of the embodiment of the present invention includes: an upper assembly 100, a movable contact assembly 200, a lower assembly 300 and a fastening part 400. At this time, in the absence of an additional component for fastening, the upper assembly 100, the movable contact assembly 200, the lower assembly 300 and the fastening part 400 can also be stably fastened by utilizing the shape deformation of the provided structural elements.

[0444] Below, refer to Figure 7 a to Fig. 22 A method for manufacturing the movable contact portion 40 according to the embodiment of the present invention will be described in detail.

[0445] (1) Description of the method for manufacturing the upper assembly 100 (step S100)

[0446] Reference Figure 7 a, Figure 7 b. Figure 8 , Fig.18 as well as Fig.19 A method for producing the upper assembly 100 will be described.

[0447] First, the housing 110 and the upper yoke 120 are combined (step S110 ). Specifically, the housing 110 is inserted into a space formed between the first upper yoke side surface 121 , the second upper yoke side surface 122 , and the upper yoke plane 123 of the upper yoke 120 .

[0448] At this time, the first upper yoke side surface 121 and the second upper yoke side surface 122 are configured to cover the upper sides of the first side surface 111 and the second side surface 112 of each housing 110. The inner surfaces of the first upper yoke side surface 121 and the second upper yoke side surface 122 may contact the outer surfaces of the first side surface 111 and the second side surface 112, respectively.

[0449] Furthermore, the upper yoke plane 123 is configured to cover the housing plane 113. For this purpose, the upper yoke plane 123 may be formed to extend longer than the housing plane 113.

[0450] A housing through hole 114 is formed through the housing plane 113. Also, an upper yoke through hole 124 is formed through the upper yoke plane 123. The housing through hole 114 and the upper yoke through hole 124 may be formed to have the same central axis.

[0451] When the combination of the housing 110 and the upper yoke 120 is completed, the support member 420 is penetrated and combined (step S120).

[0452] The base portion 421 is a portion having the largest diameter in the support member 420. As described above, the base portion 421 is formed to have a smaller diameter than the upper yoke through hole 124 before its shape is deformed by any tool such as a circular ring punch.

[0453] Thus, the support member 420 can be smoothly penetrated and coupled to the housing through hole 114 and the upper yoke through hole 124 .

[0454] The support member 420 is inserted to a height such that a surface of one side of the base portion 421 that expands radially outward can contact the inner surface of the housing plane 113 .

[0455] When the insertion of the support member 420 is completed, an arbitrary tool is inserted into the first hollow portion 423 and the second hollow portion 424. The arbitrary tool is configured to apply pressure in a radially outward direction to the support member 420. The arbitrary tool can apply pressure until the outer peripheral surface of the boss portion 422 contacts the inner peripheral surface of the upper yoke plane 123 surrounding the upper yoke through hole 124. As a result, the support member 420 expands radially outward (step S130).

[0456] As a result, the first hollow portion 423 and the second hollow portion 424 expand radially outwards, and at the same time, the outer peripheral surfaces of the base portion 421 and the boss portion 422 also expand radially outwards.

[0457] When expansion is completed, the outer circumference of the boss portion 422 contacts the inner circumference of the upper yoke plane 123 surrounding the upper yoke through hole 124. At this time, the support member 420 applies radially outward pressure to the inner circumference of the upper yoke plane 123 under the action of any tool and contacts it.

[0458] Thus, the support member 420 and the upper assembly 100 can be coupled together without an additional fastening member.

[0459] At this time, the housing through hole 114 has a larger diameter than the upper yoke through hole 124 . Therefore, when the support member 420 expands radially outward, the outer circumference of the support member 420 first contacts the inner circumference of the upper yoke plane 123 surrounding the upper yoke through hole 124 .

[0460] Thus, even if the shape of the supporting member 420 is deformed, the housing 110 is prevented from being damaged.

[0461] (2) Description of the process of combining the upper assembly 100 and the lower assembly 300 (step S200)

[0462] Below, refer to Fig. 9 a, Fig. 9 b. Fig.10 a, Fig.10 b. Fig.18 as well as Fig. 20 The process of combining the upper assembly 100 and the lower assembly 300 will be described in detail.

[0463] As described above, the shaft support member 310 and the shaft 320 constituting the lower assembly 300 may be integrally formed by insert molding or the like (step S210 ).

[0464] and, Fig. 9 a, Fig. 9 b and Fig.10 a, Fig.10 The elastic member 330 (not shown) in b may be combined with the movable contact assembly 200 .

[0465] The first side surface 111 and the second side surface 112 of the housing 110 are coupled to the housing coupling portion 311 of the shaft support member 310 (step S220 ). Specifically, one end of the first side surface 111 and one end of the second side surface 112 of the lower assembly 300 are inserted into and coupled to the coupling slits 312 .

[0466] As described above, the position and shape of the coupling slit 312 may be determined according to the position and shape of the first side surface 111 and the second side surface 112 .

[0467] At this time, a first bending portion 111a and a second bending portion 112a are respectively formed on the first side surface 111 and the second side surface 112. The first bending portion 111a and the second bending portion 112a pass through the vertical portion 312a and are inserted and combined with the bending portion 312b.

[0468] As the first bent portion 111 a and the second bent portion 112 a are respectively inserted and coupled to the bent portion 312 b of the coupling slit 312 , the coupling can be stably formed compared to a case where the housing 110 and the shaft support member 310 are coupled only in the vertical direction.

[0469] Furthermore, although not shown, each housing joint portion 311 may be formed with a through hole (not shown) in the front-rear direction. After the through hole (not shown) is inserted and combined with the first side surface 111 and the second side surface 112, it may be aligned with the first fastening hole 111b and the second fastening hole 112b.

[0470] Furthermore, an additional fastening member may be provided and penetrated and coupled to the through hole (not shown) and the fastening holes 111b and 112b (step S230). In the embodiment, the coupling between the housing 110 and the shaft supporting member 310 can be formed more firmly.

[0471] (3) Description of the process of joining the movable contact assembly 200 (step S300)

[0472] Below, refer to Fig.11 a, Fig.11 b. Fig.12 a, Fig.12 b. Fig.18 as well as Fig.21 The process of combining the movable contact assembly 200 and the process of combining the movable contact assembly 200 with the upper assembly 100 and the lower assembly 300 will be described in detail.

[0473] The lower yoke 220 is disposed at the lower side of the movable contact 210. The lower side surface of the movable contact 210 may be in contact with the upper side surface of the lower yoke 220 (step S310).

[0474] A support member receiving portion 213 is recessed on the upper side of the movable contact 210. A pin member fastening hole 214 is formed through the movable contact 210 in the height direction. The support member receiving portion 213 and the pin member fastening hole 214 communicate with each other.

[0475] The movable contact engaging portion 221 is formed to penetrate along the height direction on the radial inner side of the lower yoke 220. The engaging protrusion 215 of the movable contact 210 is inserted into the movable contact engaging portion 221 (step S320).

[0476] At this time, the diameter of the coupling protrusion 215 is formed to be smaller than the diameter of the movable contact coupling portion 221. Thus, the movable contact 210 and the lower yoke 220 can be smoothly coupled.

[0477] When the contact between the movable contact 210 and the lower yoke 220 is completed, an arbitrary tool is inserted into the support member accommodating portion 213 and the pin member fastening hole 214. The arbitrary tool is configured to apply pressure in a radially outward direction to the movable contact 210. The arbitrary tool can apply pressure until the coupling outer peripheral surface 215a of the coupling protrusion 215 contacts the yoke inner peripheral surface 222. As a result, the coupling protrusion 215 of the movable contact 210 expands radially outward (step S330).

[0478] As a result, the support member accommodating portion 213 and the pin member fastening hole 214 expand radially outward. At the same time, the connecting outer peripheral surface 215a also moves radially outward and contacts the yoke inner peripheral surface 222. At this time, the movable contact 210 applies pressure in the radially outward direction to the connecting outer peripheral surface 215a using an arbitrary tool to make contact.

[0479] Thus, the movable contact 210 and the lower yoke 220 can be coupled together without an additional fastening member.

[0480] The movable contact assembly 200 that has been completely joined is joined to the upper assembly 100 and the lower assembly 300 that have been joined through the above process. At this time, although not shown, the elastic member 330 may also be joined together.

[0481] As described above, one side of the elastic member 330 facing the movable contact assembly 200 is inserted into the elastic member supporting portion 223 , and the other side of the elastic member 330 opposite to the one side is supported by the elastic member coupling portion 314 .

[0482] As described above, the left and right sides of the housing 110 and the upper yoke 120 are open. The movable contact assembly 200 is inserted and coupled through the opening formed on the left or right side of the upper assembly 100 using the above structure.

[0483] The movable contact 210 and the lower yoke 220 are formed to extend in one direction. Furthermore, the extended length of the movable contact 210 and the lower yoke 220 is formed to be longer than the width direction (left-right direction in the illustrated embodiment) length of the housing 110 and the upper yoke 120. Thus, the ends of both sides of the movable contact 210 and the lower yoke 220 in one direction can be exposed to the outside.

[0484] When the movable contact assembly 200 is connected, the elastic member 330 is located at the lower side of the movable contact assembly 200. The elastic member 330 elastically supports the movable contact assembly 200. Thus, even if an electromagnetic reaction force occurs between the fixed contact 22 and the movable contact 210, it is possible to prevent the fixed contact 22 and the movable contact 210 from being arbitrarily separated.

[0485] (4) Description of the fastening portion 400 joining process (step S400)

[0486] Below, refer to Fig.13 a to Fig.18 and Fig. 22 The process of joining the fastening portion 400 to complete the joining of the movable contact portion 40 will be described in detail.

[0487] Through the above process, the upper assembly 100, the movable contact assembly 200 and the lower assembly 300 are combined. Since the movable contact assembly 200 is elastically supported by the elastic member 330, the movable contact 210 can be prevented from being detached to some extent.

[0488] The movable contact portion 40 according to the embodiment of the present invention can more stably maintain the coupled state of the movable contact 210 through the fastening portion 400 .

[0489] Furthermore, the fastening portion 400 can stably maintain the coupled state of the housing 110 of the upper assembly 100 and the upper yoke 120 .

[0490] The coupling process of the support member 420 of the fastening portion 400 has been described above, and therefore, the coupling process of the pin member 410 will be described below as the center.

[0491] A radially inward pressure is applied to the pin member 410. As a result, the distance between the first end 411a and the second end 411b of the pin member 410 is reduced. As a result, the diameter of the pin member 410 is reduced (step S410).

[0492] The pin member 410 is inserted through the upper assembly 100 and the movable contact assembly 200 . Specifically, the pin member 410 is inserted through the first hollow portion 423 and the second hollow portion 424 of the support member 420 and the pin member fastening hole 214 of the movable contact 210 .

[0493] In addition, the support member 420 is penetrated and coupled to the housing 110 and the upper yoke 120. Thus, the pin member 410 is inserted through the upper yoke through hole 124 and the housing through hole 114 via the support member 420.

[0494] At this time, the pin member 410 is inserted into the support member 420 and the movable contact 210 in a state of being subjected to pressure in the radially inner direction (step S420). The pressure can be applied by the circular ring punch or the like.

[0495] The pin member 410 is provided with a cutout portion 411. Thus, the pin member 410, which is subjected to pressure in the radially inner direction, is deformed to reduce its diameter. That is, the cross section of the pin member 410 is reduced. As described above, the reduced size can be compensated by the cutout portion 411.

[0496] The shrinking process is performed until the diameter, that is, the outer diameter of the pin member 410 is the same as or smaller than the diameter of the second hollow portion 424. Preferably, the shrinking process may be performed until the diameter of the pin member 410 becomes smaller than the diameter of the second hollow portion 424. Thus, the pin member 410 can be smoothly inserted and coupled to the support member 420.

[0497] The pin member 410 may be inserted to one end of the pin member 410 , and the lower end in the illustrated embodiment is located at the elastic hollow portion 331 of the elastic member 330 .

[0498] When the pin member 410 is inserted to a desired depth, the pressure applied to the pin member 410 is released. As a result, the pin member 410 expands radially outward. That is, the pin member 410 returns to its original shape (step S430).

[0499] At this time, the diameter of the second hollow portion 424 is formed smaller than the diameter of the pin member 410 before the pin member 410 is deformed. Thus, the expansion of the pin member 410 is restricted by the second hollow portion 424. As a result, the outer peripheral surface 413a of the pin member 410 applies radially outward pressure to the pin member contact surface 425 of the second hollow portion 424 and contacts. That is, the pin member 410 is coupled to the support member 420 in an interference fit manner.

[0500] Thus, even without an additional fastening member, the pin member 410 and the supporting member 420 can be firmly maintained in a coupled state.

[0501] Furthermore, there may be a case where the pin member 410 needs to be separated for maintenance, etc. In this case, the pin member 410 can be easily separated simply by applying radially inward pressure to the pin member 410 .

[0502] The pin member 410 penetrates the movable contact 210 and the lower yoke 220 and is arranged with its lower end closer to the lower assembly 300 than the lower side of the lower yoke 220. Thus, the movable contact 210 can be supported more stably than when only the elastic member 330 is used for elastic support.

[0503] (5) Description of the movable contact portion 40 according to another embodiment of the present invention

[0504] Below, refer to Fig.23 and Fig.24The movable contact portion 40 according to another embodiment of the present invention will be described in detail.

[0505] The present embodiment is different from the above-mentioned embodiment in the connection relationship between the housing 110 and the upper yoke 130 included in the upper assembly 100 .

[0506] That is, in the above-mentioned embodiment, the upper yoke 120 is disposed on the outer side of the housing 110 , while in the present embodiment, the upper yoke 130 is disposed on the inner side of the housing 110 .

[0507] Except for the above-mentioned differences, the movable contact assembly 200 , the lower assembly 300 , and the fastening portion 400 have the same structure.

[0508] In this regard, the following description will focus on the upper yoke 130 and the connection relationship between the upper yoke 130 and other components.

[0509] The upper yoke 130 is located inside the housing 110. That is, the upper yoke 130 is accommodated in the housing space 115. The shape of the upper yoke 130 is similar to that of the upper yoke 120 of the above-described embodiment.

[0510] However, the extension length of the upper yoke plane 133 of the upper yoke 130 is shorter than the extension length of the housing plane 113. Specifically, the extension length of the upper yoke plane 133 may be the same as or shorter than the distance between the first side surface 111 and the second side surface 112.

[0511] The first upper yoke side surface 131 and the second upper yoke side surface 132 extend from both ends of the upper yoke plane 133 in one direction, that is, the front end and the rear end in the illustrated embodiment.

[0512] The first upper yoke side surface 131 and the second upper yoke side surface 132 may respectively form a predetermined angle with the upper yoke plane 133 and extend. In one embodiment, the predetermined angle may be a right angle.

[0513] The outer surface of the first upper yoke side surface 131 contacts the inner surface of the first side surface 111 , the outer surface of the second upper yoke side surface 132 contacts the inner surface of the second side surface 112 , and the upper surface of the upper yoke plane 133 contacts the inner surface of the housing plane 113 .

[0514] An upper yoke space portion 135 is defined by the first upper yoke side surface 131 , the second upper yoke side surface 132 , and the upper yoke plane 133 . The movable contact assembly 200 may be accommodated in the upper yoke space portion 135 .

[0515] That is, the upper yoke space portion 135 is configured to perform the function of the housing space portion 115 in the above-described embodiment.

[0516] An upper yoke through hole 134 is formed through the upper yoke plane 133. The upper yoke through hole 134 may be formed through along the height direction of the upper yoke plane 133. Also, the upper yoke through hole 134 may be formed at the center of the upper yoke plane 133. The upper yoke through hole 134 may be configured to have the same central axis as the housing through hole 114.

[0517] The diameter of the upper yoke through hole 134 may be formed larger than the housing through hole 114. In this case, the support member 420 may be coupled to the housing 110 in an interference fit manner.

[0518] As an alternative, the diameter of the upper yoke through hole 134 may be formed smaller than the case through hole 114. In this case, the support member 420 may be coupled to the upper yoke 130 in an interference fit manner.

[0519] The support member 420 may be sequentially inserted into and coupled to the housing through hole 114 and the upper yoke through hole 134. The process of expanding the support member 420 using any tool and coupling it to the housing 110 or the upper yoke 130 is the same as described above.

[0520] The above description refers to the preferred embodiments of the present invention. However, it should be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the scope of the concept and field of the present invention as described in the appended claims.

[0521] Description of Reference Numerals

[0522] 1: DC relay; 10: frame; 11: upper frame; 12: lower frame; 13: insulating plate; 14: support plate; 20: opening and closing part; 21: arc chamber; 22: fixed contact; 23: sealing member; 30: core; 31: fixed core; 32: movable core; 32a: protrusion; 33: yoke; 34: winding bobbin; 35: coil; 36: return spring; 37: cylinder; 40: movable contact part; 100: upper assembly; 110: housing; 111: first side surface; 111a: first bending portion; 111b: first fastening hole; 112: second side surface; 112a: second bending portion; 112b: second fastening hole; 113: housing plane; 114: housing through hole; 1 15: housing space; 120: upper yoke; 121: first upper yoke side; 122: second upper yoke side; 123: upper yoke plane; 124: upper yoke through hole; 130: upper yoke; 131: first upper yoke side; 132: second upper yoke side; 133: upper yoke plane; 134: upper yoke through hole; 135: upper yoke space; 200: movable contact assembly; 210: movable contact; 211: main body; 212: protrusion; 213: support member accommodating portion; 214: pin member fastening hole; 215: joint protrusion; 215a: joint outer peripheral surface; 220: lower yoke; 221: movable contact joint; 222: yoke inner peripheral surface; 223: elastic structure Component support portion; 224: main inner surface; 300: lower assembly; 310: shaft support member; 311: shell joint; 312: joint slit; 312a: vertical portion; 312b: bending portion; 313: elastic member accommodating portion; 314: elastic member joint; 315: shaft joint; 320: shaft; 321: head; 322: shaft main body; 323: movable core support portion; 330: elastic member; 331: elastic hollow portion; 400: fastening portion; 410: pin member; 411: cut portion; 411a: first end portion; 411b: second end portion; 412: hollow portion; 413: outer peripheral portion; 413a: outer peripheral surface; 420: support member; 421: base portion; 422: convex Column portion; 422a: inner peripheral surface of the convex column portion; 423: first hollow portion; 424: second hollow portion; 425: contact surface of the pin member; 1000: DC relay of the prior art; 1100: frame portion of the prior art; 1110: upper frame of the prior art; 1120: lower frame of the prior art; 1200: contact portion of the prior art; 1210: fixed contact of the prior art; 1220: movable contact of the prior art; 1300: actuator of the prior art; 1310: coil of the prior art; 1320: bobbin of the prior art; 1330: fixed core of the prior art; 1340: movable core of the prior art; 1350: movable shaft of the prior art; 1360: spring of the prior art;1400: movable contact moving part of the prior art; 1410: movable contact supporting part of the prior art; 1420: movable contact cover part of the prior art; 1430: elastic part of the prior art. ;

Claims

1. A DC relay, in, include: Fixed contact piece; a movable contact that contacts or separates from the fixed contact to allow or disconnect energization; and A lower yoke, located at the lower side of the movable contact, offsets the electromagnetic reaction force generated between the fixed contact and the movable contact, A coupling protrusion having a predetermined diameter is protruded from the lower side of the movable contact piece. The lower yoke comprises: an elastic member support portion, which is recessed from the lower side of the lower yoke at a predetermined distance; a movable contact piece coupling portion, which is recessed from the upper side of the lower yoke at a predetermined distance and is connected to the elastic member support portion, and the movable contact piece coupling portion has a larger diameter than the coupling protrusion. The movable contact member coupling portion has a diameter smaller than the elastic member supporting portion. After the coupling protrusion is inserted into the movable contact coupling portion, when a pressure toward the radially outer side is applied to the coupling protrusion, the coupling protrusion expands toward the radially outer side and matches with the movable contact coupling portion.

2. The DC relay according to claim 1, wherein: The lower yoke includes a yoke inner peripheral surface, which is configured to surround the movable contact member coupling portion and forms a part of the inner peripheral surface of the lower yoke. When the engaging protrusion is matched with the movable contact engaging portion, the outer peripheral surface of the engaging protrusion contacts the inner peripheral surface of the yoke.

3. The DC relay according to claim 1, wherein: comprising an upper yoke, the upper yoke being located on the upper side of the movable contact piece and counteracting the electromagnetic reaction force generated between the fixed contact piece and the movable contact piece, When the fixed contact and the movable contact are in contact to allow energization, an electromagnetic attractive force is generated between the upper yoke and the lower yoke.

4. The DC relay according to claim 3, wherein: A housing is included, the housing being located between the movable contact and the upper yoke.

5. The DC relay according to claim 4, wherein: A shell through hole is formed in the shell along the height direction. An upper yoke through hole is formed in the upper yoke along the height direction. The housing through hole has a larger diameter than the upper yoke through hole, The housing through-hole and the upper yoke through-hole are arranged to have a coaxial relationship.

6. The DC relay according to claim 5, wherein: The supporting member includes a supporting member extending along the height direction and penetrating and connecting with the housing through hole and the upper yoke through hole. When the support member is subjected to radially outward pressure after being inserted into the housing through hole and the upper yoke through hole, the outer peripheral surface of the support member contacts the inner peripheral surface of the upper yoke forming the upper yoke through hole.

7. The DC relay according to claim 6, wherein: comprising a pin member, the pin member being connected to the supporting member through and supporting the movable contact piece, The pin member is formed to extend in one direction and has a cross section having a larger diameter than the upper yoke through hole. The pin member comprises: a first end portion, constituting one end portion in the circumferential direction of the outer peripheral portion of the pin member; and The second end portion is spaced a predetermined distance from the first end portion, faces the first end portion, and constitutes the other end portion in the circumferential direction of the outer peripheral portion of the pin member.

8. The DC relay according to claim 7, wherein: When a radially inward pressure is applied to the pin member, the diameter of the cross section of the pin member becomes smaller than the diameter of the upper yoke through hole due to a decrease in the distance between the first end and the second end.

9. The DC relay according to claim 3, wherein: comprising a housing, the housing being configured to cover the upper yoke, The upper yoke is located between the movable contact and the housing.

10. The DC relay according to claim 9, wherein: A shell through hole is formed in the shell along the height direction. An upper yoke through hole is formed in the upper yoke along the height direction. The housing through hole has a larger diameter than the upper yoke through hole, The housing through-hole and the upper yoke through-hole are arranged to have a coaxial relationship.

11. The DC relay according to claim 10, wherein: The supporting member includes a supporting member extending along the height direction and penetrating and connecting with the housing through hole and the upper yoke through hole. When the support member is subjected to radially outward pressure after being inserted into and coupled to the housing through-hole and the upper yoke through-hole, the outer peripheral surface of the support member contacts the inner peripheral surface of the upper yoke forming the upper yoke through-hole.

12. The DC relay according to claim 11, wherein: comprising a pin member, the pin member penetrating and coupled to the movable contact piece and supporting the movable contact piece, The pin member is formed to extend in one direction and has a cross section with a smaller diameter than the upper yoke through hole, The pin member comprises: a first end portion, constituting one end portion in the circumferential direction of the outer peripheral portion of the pin member; and The second end portion is spaced a predetermined distance from the first end portion, faces the first end portion, and constitutes the other end portion in the circumferential direction of the outer peripheral portion of the pin member.

13. The DC relay according to claim 12, wherein: When a radially inward pressure is applied to the pin member, the diameter of the cross section of the pin member becomes smaller than the diameter of the upper yoke through hole due to a decrease in the distance between the first end and the second end.

14. A method for manufacturing a DC relay, the DC relay comprising a fixed contact and a movable contact, the movable contact being in contact with or separated from the fixed contact to allow or disconnect power, wherein: The manufacturing method of the DC relay comprises: (a) step, combining an upper yoke and a housing, wherein the upper yoke is located on the upper side of the movable contact piece to offset the electromagnetic reaction force generated between the fixed contact piece and the movable contact piece, and the housing is located between the movable contact piece and the upper yoke; (b) a support member extending in the height direction penetrates and is coupled to the upper yoke and the housing; (c) a step of applying pressure radially outward to the support member, thereby causing the support member to expand radially outward; (d) step, wherein the lower side of the movable contact piece contacts the upper side of the lower yoke to offset the electromagnetic reaction force generated between the fixed contact piece and the movable contact piece; The lower yoke comprises: an elastic member support portion, which is recessed at a predetermined distance from the lower side surface of the lower yoke; a movable contact piece coupling portion, which is recessed at a predetermined distance from the upper side surface of the lower yoke and is connected to the elastic member support portion, and the movable contact piece coupling portion is formed so that the diameter is smaller than the diameter of the elastic member support portion. (e) a step of inserting a coupling protrusion formed at a predetermined diameter on the lower side of the movable contact into a movable contact coupling portion formed at an upper side of the lower yoke with a diameter larger than that of the coupling protrusion; and (f) step, applying pressure toward the radially outward direction to the combining protrusion, so that the combining protrusion expands toward the radially outward direction.

15. The method for manufacturing a DC relay according to claim 14, wherein: After the step (c), the method further comprises: (g) applying radially inward pressure to the pin member to reduce the diameter of the pin member; (h) step, the pin member is connected through the support member; and In step (i), the pressure applied to the pin member is released, so that the pin member expands radially outward.

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