Electromagnetic relay

Abstract

An electromagnetic relay (1) includes a sealed housing (2), a fixed contact (31), a movable member (4) having a movable contact (41), a shaft (5), a movable core (61), a fixed core (62), a return spring (63), an electromagnetic coil (64), and a sleeve (7). The shaft (5) is slidably inserted through a through hole (621) formed in the fixed core (62). The sleeve (7) has a support section (71) that supports the movable core section (61) so as to define the position of the movable core section (61) with respect to the fixed core section (62) in a state in which the magnetic attraction force is not applied. A position adjustment section (11) for adjusting the positional relationship between the fixed core section (62) and the support section (71) when the sleeve (7) is directly or indirectly fixed to the fixed core section (62) is formed at the tip of the sleeve (7).

Description

Citation of related applications

[0001] This application is based on Japanese Patent Application No. 2022-087570 filed on May 30, 2022, and the contents thereof are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to an electromagnetic relay. Background Art

[0003] It is known that an electromagnetic relay moves a movable part by a magnetic attraction generated by energizing an electromagnetic coil, thereby making a fixed contact and a movable contact contact or separate. In addition, for example, Patent Document 1 discloses a sealed contact device, which, in order to improve the disconnection performance between a fixed contact and a movable contact when the electromagnetic relay is disconnected, arranges a contact portion in a space hermetically sealed with a gas such as hydrogen. As a result, an arc generated between the contacts can be easily extinguished, and the disconnection performance can be improved.

[0004] The technique disclosed in Patent Document 1 is configured such that, in the contact seal device, contact pressure, that is, contact pressure between a fixed contact and a movable contact when the contact is turned on, can be adjusted. Prior art literature Patent Literature

[0005] Patent Document 1: Japanese Patent Laid-Open No. 9-259728 Summary of the invention

[0006] The sealed contact device disclosed in Patent Document 1 is difficult to adjust the distance between the contacts when disconnected. That is, it is difficult to form the distance between the fixed contact and the movable contact with high precision when the electromagnetic coil is not energized. If the distance between the fixed contact and the movable contact when disconnected is too small, it is difficult to extinguish the arc when the electromagnetic relay is disconnected, which is likely to be disadvantageous in terms of cutting performance. On the other hand, considering the manufacturing deviation, if it is to ensure that the distance between the fixed contact and the movable contact when disconnected is sufficiently large, this will become the main reason for the large-scale electromagnetic relay.

[0007] The present disclosure provides an electromagnetic relay capable of adjusting the distance between contacts when disconnected.

[0008] One aspect of the present disclosure is an electromagnetic relay, comprising: a sealed housing; A fixed contact, wherein the fixed contact is disposed in the sealed housing; A movable member, the movable member having a movable contact point that contacts and separates relative to the fixed contact point in the sealed housing; a shaft, the shaft holding the movable member and arranged to be able to advance and retreat in the axial direction relative to the sealing housing; a movable core, the movable core being fixed to the shaft; A fixed core, the fixed core being fixed to the sealing shell; a return spring, the return spring applying force to the movable contact in a direction away from the fixed contact; an electromagnetic coil which generates a magnetic attraction force between the fixed core and the movable core when energized; and a sleeve, the sleeve sealing the return spring and the movable core in an airtight manner and being directly or indirectly fixed to the fixed core, The shaft is inserted into a through hole formed in the fixed core in a slidable manner. The sleeve has a support portion, and the support portion supports the movable core in a manner that limits the position of the movable core relative to the fixed core when the magnetic attraction force is not in effect. A position adjusting portion is formed at a front end portion of the sleeve, and the position adjusting portion is used to adjust a positional relationship between the fixed core portion and the support portion when the sleeve is directly or indirectly fixed to the fixed core portion.

[0009] The electromagnetic relay is provided with the position adjustment portion at the front end of the sleeve, so that the position of the support portion relative to the fixed core portion can be adjusted. As a result, the distance between the fixed contact and the movable contact when disconnected, i.e., the distance between the contacts, can be adjusted.

[0010] As described above, according to the above aspect, it is possible to provide an electromagnetic relay capable of adjusting the distance between contacts when the relay is opened. BRIEF DESCRIPTION OF THE DRAWINGS The above objects, other objects, features and advantages of the present disclosure will become more apparent with reference to the accompanying drawings and the following detailed description. Figure 1 This is a cross-sectional explanatory diagram of the electromagnetic relay in the first embodiment. Figure 2 yes Figure 1 Sectional view taken along line II-II. Figure 3 This is a cross-sectional explanatory diagram of the electromagnetic relay showing a contact contact state in which the contact pressure is substantially zero in the first embodiment. Figure 4 This is a cross-sectional explanatory diagram showing the electromagnetic relay in the state where contact pressure acts in the first embodiment. Figure 5 This is an explanatory diagram of a state before the shaft is inserted into the fixed core portion in the first embodiment. Figure 6 This is an explanatory diagram of the step of covering the movable member and the like with the sealing case in the first embodiment. Figure 7 This is an explanatory diagram of a state in which the movable contact and the fixed contact are brought into contact with each other in the first embodiment with the contact pressure being zero. Figure 8 This is an explanatory diagram of the process of assembling the movable core to the shaft while maintaining the contact pressure at zero in the first embodiment. Fig. 9 This is an explanatory diagram of the process of covering the movable core with the sleeve while keeping the contact pressure at zero in the first embodiment. Fig.10 This is an explanatory diagram of the process of applying contact pressure and moving the sleeve forward together with the movable core in the first embodiment. Fig.11 This is an explanatory diagram of the step of retreating the sleeve together with the movable core by a predetermined amount in the first embodiment. Fig.12 This is a cross-sectional explanatory diagram of the electromagnetic relay in the second embodiment. Fig.13 This is an enlarged cross-sectional explanatory diagram of the vicinity of the joining portion between the fixed core and the sleeve in the second embodiment. Fig.14 This is an explanatory diagram of a cross section of a fixed core portion in a plane perpendicular to the Z direction in the second embodiment. Fig.15 This is an explanatory diagram of a cross section of the sleeve in a plane perpendicular to the Z direction in the second embodiment. Fig.16 This is an enlarged cross-sectional explanatory diagram of the vicinity of the joining portion between the fixed core and the sleeve in the third embodiment. Fig.17 This is an explanatory diagram of the fixed core portion when viewed from the rear in the Z direction in the third embodiment. Fig.18 is the same as in implementation mode 3 Fig.16 A cross-sectional illustration of the sleeve corresponding to the cross-sectional view taken along line XVIII-XVIII. Fig.19 It is a cross-sectional explanatory diagram of the electromagnetic relay in the fourth embodiment. Fig. 20 This is an explanatory diagram of the process of covering the movable core with the sleeve while keeping the contact pressure at zero in the fourth embodiment. Fig.21 This is an explanatory diagram of the process of applying contact pressure and moving the sleeve forward together with the movable core in the fourth embodiment. Fig. 22 This is an explanatory diagram of the step of retreating the sleeve together with the movable core by a predetermined amount in the fourth embodiment. Fig.23 It is a cross-sectional explanatory diagram of the electromagnetic relay in the fifth embodiment. Fig.24This is an explanatory diagram of the state in which the contact pressure is maintained at zero in the fifth embodiment, immediately before the sleeve covers the movable core. Fig.25 This is an explanatory diagram of the process of covering the movable core with the sleeve while maintaining the contact pressure at zero in the fifth embodiment. Fig.26 This is an explanatory diagram of the process of applying contact pressure and moving the sleeve forward together with the movable core in the fifth embodiment. Fig. 27 This is an explanatory diagram of the step of retreating the sleeve together with the movable core by a predetermined amount in the fifth embodiment. Fig.28 It is a cross-sectional explanatory diagram of the electromagnetic relay in the sixth embodiment. Fig.29 This is an explanatory diagram of the process of assembling the movable core portion to the shaft in the sixth embodiment, with the contact pressure maintained at zero and the distance between the core portions adjusted. Fig.30 This is an explanatory diagram of the state immediately before the sleeve is covered on the fixed core portion in the sixth embodiment. Fig.31 This is an explanatory diagram of the step of supporting the movable core on the support portion and moving the sleeve forward in the sixth embodiment. Fig.32 This is an explanatory diagram of a state in which the sleeve is advanced together with the movable core until the distance between the cores reaches a predetermined distance in the sixth embodiment. DETAILED DESCRIPTION

[0012] (Implementation Method 1) Reference Figures 1 to 11 An implementation method of an electromagnetic relay will be described below. like Figure 1 As shown, the electromagnetic relay 1 of this embodiment includes a sealed case 2 , a fixed contact 31 , a movable member 4 having a movable contact 41 , a shaft 5 , a movable core 61 , a fixed core 62 , a return spring 63 , an electromagnetic coil 64 , and a sleeve 7 .

[0013] The fixed contact 31 is arranged in the sealed housing 2. The movable element 4 has a movable contact 41. The movable contact 41 contacts and separates from the fixed contact 31 in the sealed housing 2. The shaft 5 is provided to hold the movable element 4 and to be able to advance and retreat relative to the sealed housing 2 in the axial direction Z. The movable core 61 is fixed to the shaft 5.

[0014] The fixed core 62 is fixed to the sealed housing 2. The return spring 63 applies force to the movable contact 41 in a direction away from the fixed contact 31. The electromagnetic coil 64 generates a magnetic attraction force between the fixed core 62 and the movable core 61 by energizing. The sleeve 7 hermetically seals the return spring 63 and the movable core 61, and is directly or indirectly fixed to the fixed core 62.

[0015] The shaft 5 is slidably inserted into the through hole 621 formed in the fixed core 62. The sleeve 7 has a support portion 71. The support portion 71 supports the movable core 61 so as to define the position of the movable core 61 relative to the fixed core 62 when the magnetic attraction force is not applied.

[0016] A position adjustment portion 11 is formed at the front end of the sleeve 7. The position adjustment portion 11 is a portion for adjusting the positional relationship between the fixed core 62 and the support portion 71 when the sleeve 7 is directly or indirectly fixed to the fixed core 62. In this embodiment, the position adjustment portion 11 is composed of an adjustment space 110 described later.

[0017] In electromagnetic relay 1, the axial direction of shaft 5, that is, the advancing and retreating direction of movable contact 41 is appropriately referred to as Z direction. The side of movable contact 41 close to fixed contact 31 in the Z direction is referred to as the front side, and the opposite side is referred to as the rear side.

[0018] In the present embodiment, the electromagnetic relay 1 has a magnetic plate 12 fixed to the front end of the fixed core 62. The magnetic plate 12 and the fixed core 62 are hermetically sealed by welding. The magnetic plate 12 is arranged in a manner such that the main surface faces the Z direction and extends further toward the outer peripheral side than the fixed core 62. The rear end of the sealed housing 2 is fixed to the magnetic plate 12. The fixed contact 31 and the movable contact 41 are arranged in the space surrounded by the sealed housing 2 and the magnetic plate 12. This space is appropriately referred to as the contact configuration space 101.

[0019] The rear end of the sealed housing 2 is fixed to the magnetic plate 12 in a sealed state with the magnetic plate 12 over the entire circumference. The sealed housing 2 is made of, for example, ceramic. The magnetic plate 12 is made of, for example, a steel plate. A clamping member such as an iron plate (not shown) is arranged between the sealed housing 2 and the magnetic plate 12. The clamping member has a linear expansion coefficient between the magnetic plate 12 and the sealed housing 2. By welding the clamping member and the magnetic plate 12, and brazing the clamping member and the sealed housing 2, it is possible to ensure the seal between the sealed housing 2 and the magnetic plate 12 while fixing the sealed housing 2 and the magnetic plate 12.

[0020] The fixed contact 31 is provided on the busbar 3 fixed to a part of the sealed housing 2. Two busbars 3 electrically insulated from each other are fixed to the sealed housing 2. Fixed contacts 31 are provided on each of these busbars 3. The two fixed contacts 31 face the rear side in the Z direction. In addition, the busbar 3 and the sealed housing 2 are hermetically sealed by brazing.

[0021] Two movable contacts 41 are arranged opposite to the two fixed contacts 31 from the rear side in the Z direction. The two fixed contacts 31 are arranged on the front side of a movable member 4. The movable member 4 is made of, for example, a metal plate. The shaft 5 is inserted through the movable member 4 at a position between the two movable contacts 41. The shaft 5 and the movable member 4 are arranged to be able to slide relative to each other in the Z direction. A contact pressure spring 13 is provided between the shaft 5 and the movable member 4 to elastically support both in the Z direction. The rear end of the contact pressure spring 13 abuts against a supporting member 131 fixed to the shaft 5. In addition, the front end of the contact pressure spring 13 abuts against the rear surface of the movable member 4.

[0022] An electromagnetic coil 64 wound around an insulating bobbin 65 is disposed on the rear side of the magnetic plate 12. A fixed core 62 and a movable core 61 are disposed on the inner circumference of the electromagnetic coil 64. In addition, a return spring 63 is disposed between the fixed core 62 and the movable core 61 in the Z direction. The return spring 63 is composed of a coil spring and is disposed between the fixed core 62 and the movable core 61 in an elastically compressed state.

[0023] In addition, the sleeve 7 covers the rear end face and the outer peripheral surface of the movable core 61, and is fixed to the outer peripheral surface of the fixed core 62. The outer peripheral surface of the fixed core 62 is a surface parallel to the advance and retreat direction Z of the movable core 61. The sleeve 7 is joined to the outer peripheral surface of the fixed core 62. The sleeve 7 has a rear wall portion 710 and a cylindrical side wall portion 720 erected forward from the outer periphery of the rear wall portion 710. That is, the sleeve 7 has a bottomed cylindrical shape. In addition, the material of the sleeve 7 is not particularly limited, and it can be, for example, stainless steel.

[0024] like Figure 2 As shown, the inner circumference of the sleeve 7 and the outer circumference of the fixed core 62 are sealed over the entire circumference. The sleeve 7 and the outer circumference of the fixed core 62 are welded over the entire circumference, for example. Figure 1 , Figure 2 In the figure, the portion indicated by reference numeral 14 represents a welded portion.

[0025] Thus, the movable core 61 and the return spring 63 are hermetically sealed in the space surrounded by the sleeve 7 and the fixed core 62 (hereinafter, appropriately referred to as the core configuration space 102). However, there is a small gap between the through hole 621 of the fixed core 62 and the outer peripheral surface of the shaft 5. Therefore, the core configuration space 102 and the contact configuration space 101 are connected through the gap. However, both the core configuration space 102 and the contact configuration space 101 are hermetically sealed relative to the other outside. Therefore, the contact configuration space 101 is hermetically sealed relative to the outside. Moreover, a gas such as hydrogen is sealed in the contact configuration space 101.

[0026] In addition, the rear wall portion 710 of the sleeve 7 supports the rear surface of the movable core 61. That is, in this embodiment, the rear wall portion 710 corresponds to the support portion 71. Figure 1 As shown, the rear wall portion 710 as the support portion 71 supports the movable core 61 in a manner that limits the position of the movable core 61 relative to the fixed core 62 when no magnetic attraction is applied between the fixed core 62 and the movable core 61. A threaded hole 611 is formed in the movable core 61. An external threaded portion 51 that is threadedly engaged with the threaded hole 611 of the movable core 61 is formed at the rear end portion of the shaft 5.

[0027] There is a space 110 adjacent to the front end side of the front end portion of the sleeve 7. This space is appropriately called an adjustment space 110. That is, the front end portion of the sleeve 7 does not abut against the magnetic plate 12, and the position adjacent to the front end portion of the sleeve 7 in the Z direction becomes the adjustment space 110. In the present embodiment, this structural portion, that is, the structural portion in which the adjustment space 110 is adjacent to the front end side of the front end portion of the sleeve 7 is equivalent to the above-mentioned position adjustment portion 11. The position adjustment portion 11 will be described in more detail in the description of the manufacturing method of the electromagnetic relay 1 of the present embodiment described later.

[0028] Next, refer to Figure 1 , Figure 3 , Figure 4 The operation of electromagnetic relay 1 according to the present embodiment will be described. When the electromagnetic coil 64 is not energized, no electromagnetic attraction is generated between the fixed core 62 and the movable core 61. Figure 1 As shown, the movable core 61 is pressed in a direction away from the fixed core 62, that is, in the rear, by the force of the return spring 63. As a result, the movable member 4 mounted on the movable core 61 via the shaft 5 is in a state of retreating to the rear, and the movable contact 41 is away from the fixed contact 31. In this state, the movable core 61 is in a state of being supported by the support portion 71 of the sleeve 7. Therefore, the distance between the fixed contact 31 and the movable contact 41, that is, the distance between the contacts becomes a predetermined size Gp. The size Gp of the distance between the contacts when disconnected is set to a distance that can fully achieve arc extinguishing.

[0029] By energizing the electromagnetic coil 64 from this state, an electromagnetic attraction force is generated between the fixed core 62 and the movable core 61. Figure 3 As shown, the fixed core 62 moves forward against the restoring force of the return spring 63 , and accordingly, the shaft 5 and the movable member 4 move forward. Then, the movable contact 41 comes into contact with the fixed contact 31 . Figure 3 The state shown is a state at the moment when the movable contact 41 and the fixed contact 31 are in contact with each other, and is a state in which the contact pressure between the fixed contact 31 and the movable contact 41 is substantially zero.

[0030] Then, starting from this state, Figure 4 As shown, the movable core 61 moves forward further. In the present embodiment, the movable core 61 moves forward until a portion of the movable core 61 abuts against a portion of the fixed core 62. At this time, the shaft 5 fixed to the movable core 61 moves forward, but since the movable contact 41 abuts against the fixed contact 31, the movable member 4 does not move forward. Therefore, the shaft 5 also moves forward relative to the movable member 4, and the contact pressure spring 13 is compressed and deformed. As a result, the elastic force of the contact pressure spring 13 contributes to the abutment pressure between the fixed contact 31 and the movable contact 41.

[0031] In addition, if from the Figure 4 When the electromagnetic coil 64 is powered off from the state of being in ... Figure 1 The movable core 61 is in a state supported by the support portion 71 of the sleeve 7. As a result, the gap between the fixed contact 31 and the movable contact 41, that is, the distance between the contacts becomes a predetermined size Gp and the movable core 61 is stationary.

[0032] Next, refer to Figure 5 to Figure 11 A method for manufacturing the electromagnetic relay 1 according to the present embodiment will be described. like Figure 5 As shown in FIG. 1 , a subassembly is prepared in which the fixed core 62 and the magnetic plate 12 are integrated, and a subassembly includes the shaft 5, the movable member 4, and the contact pressure spring 13. Next, the shaft 5 is inserted into the through hole 621 of the fixed core 62. Next, as shown in FIG. Figure 6 , Figure 7 As shown, the seal case 2 to which the busbar 3 is fixed is arranged so as to cover the front end of the movable element 4 and the shaft 5. Then, the rear end of the seal case 2 is joined to the magnetic plate 12.

[0033] In addition, if Figure 7 As shown, the shaft 5 is advanced and the movable contact 41 is brought into contact with the fixed contact 31. At this time, the contact load between the movable contact 41 and the fixed contact 31 is substantially zero. Figure 8 As shown in FIG. 1 , the movable core 61 is assembled at the rear end of the shaft 5. That is, the contact pressure at this time is substantially zero. That is, the external threaded portion 51 of the shaft 5 is screwed into the threaded hole 611 of the movable core 61. Then, the position of the movable core 61 relative to the fixed core 62 in the Z direction is adjusted. For example, Figure 8As shown, by sandwiching the gap adjustment gauge 81 between the fixed core 62 and the movable core 61, the gap in the Z direction between the fixed core 62 and the movable core 61 (hereinafter also appropriately referred to as the inter-core distance) is adjusted to the desired size Gs.

[0034] In this state, the rear end portion of the screw hole 611 of the movable core 61 is sealed by brazing or the like from the rear end side of the screw hole 611 , and the movable core 61 and the fixed core 62 are fixed. In this state, the size of the core distance Gs to be adjusted is appropriately set according to the desired contact pressure. Figure 4 state) so that the shaft 5 is moved from the state where the contact pressure is zero (i.e. Figure 3 In addition, Gs is consistent with the compression displacement of the contact pressure spring 12 when the electromagnetic relay 1 is in the on state.

[0035] Then, if Fig. 9 As shown, the sleeve 7 is covered on the movable core 61. At this time, there is an adjustment space 110 adjacent to the front end of the sleeve 7. That is, the front end of the sleeve 7 does not abut against the magnetic plate 12. The dimension of the adjustment space 110 in the Z direction is greater than Gs.

[0036] Then, if Fig.10 As shown, the sleeve 7 is pressed forward. As a result, the movable core 61 and the shaft 5 move forward. Here, the sleeve 7 is pressed forward until the movable core 61 abuts against the fixed core 62. That is, Fig. 9 Starting from the state of Gs, the sleeve 7 is pressed forward by the dimension Gs. Along with this, the contact pressure of the movable contact 41 relative to the fixed contact 31 is applied, and the contact pressure spring 13 is elastically compressed.

[0037] Then, if Fig.11 As shown, the sleeve 7 is retracted. Then, the movable core 61 and the shaft 5 are retracted by the restoring force of the return spring 63. With this, the contact pressure between the fixed contact 31 and the movable contact 41 is reduced, and the movable contact 41 moves away from the fixed contact 31. Then, the sleeve 7 is retracted until the gap between the fixed contact 31 and the movable contact 41 becomes a predetermined size Gp. That is, the movable core 61 is retracted until the size of the gap between the fixed core 62 and the movable core 61 becomes Gp+Gs. This can be achieved by changing the position of the sleeve 7 relative to the fixed core 62 from Fig.10 Then, in this state, the sleeve 7 is fixed to the fixed core 62. For example, the front end of the sleeve 7 is welded to the outer peripheral surface of the fixed core 62.

[0038] Then, by arranging the electromagnetic coil 64 wound on the bobbin 65 on the outer peripheral side of the sleeve 7, it is possible to obtain Figure 1 The electromagnetic relay 1 shown. In addition, the distance between the contacts when the electromagnetic relay 1 is energized and disconnected is set to a predetermined size Gp with high accuracy.

[0039] Next, the effects of this embodiment will be described. The electromagnetic relay 1 has a position adjustment portion 11 formed at the front end of the sleeve 7. Therefore, the position of the support portion 71 relative to the fixed core 62 can be adjusted. As a result, the distance between the fixed contact 31 and the movable contact 41 when opening, that is, the distance between the contacts can be adjusted.

[0040] Since the distance between the contacts can be adjusted, for example, the distance between the contacts can be set to the minimum necessary distance for sufficiently extinguishing the arc when the electromagnetic relay 1 is turned off. This facilitates miniaturization of the electromagnetic relay 1.

[0041] In addition, an adjustment space 110 is adjacent to the front end side of the front end portion of the sleeve 7. That is, the position adjustment portion 11 is constituted by the adjustment space 110. Thus, as described above, before the sleeve 7 is fixed to the fixed core 62, the distance between the contacts can be easily adjusted by sliding the sleeve 7 in the Z direction.

[0042] In addition, the outer peripheral surface of the fixed core 62 is parallel to the Z direction. Moreover, the sleeve 7 is engaged with the outer peripheral surface of the fixed core 62. Thus, before the sleeve 7 is fixed to the fixed core 62, it is easy to slide the sleeve 7 in the Z direction. Therefore, the distance between the contacts can be more easily adjusted.

[0043] As described above, according to the present embodiment, it is possible to provide an electromagnetic relay capable of adjusting the distance between contacts when the relay is opened.

[0044] (Implementation Method 2) like Figure 12 to Figure 15 As shown, this embodiment is an embodiment in which the longitudinal groove portion 622 formed on the outer peripheral surface of the fixed core portion 62 is fitted with the inner protrusion portion 722 of the sleeve 7. That is, in this embodiment, if Fig.13 , Fig.14 As shown, a longitudinal groove portion 622 is formed on the outer peripheral surface of the fixed core portion 62 and is continuous along the axial direction Z. Fig.13 , Fig.15 As shown in FIG. 6 , the sleeve 7 has an inner protrusion 722 protruding toward the inner circumference from the vicinity of the front end of the side wall portion 720 . The inner protrusion 722 is disposed in the longitudinal groove portion 622 .

[0045] like Fig.14As shown in FIG. 1 , in this embodiment, the longitudinal grooves 622 are formed at four locations on the outer peripheral surface of the fixed core 62. The four longitudinal grooves 622 are formed at substantially equal intervals in the circumferential direction. Fig.13 As shown, the longitudinal groove portion 622 is open to the rear end side. In addition, the longitudinal groove portion 622 is not open to the front end side. However, the longitudinal groove portion 622 can also be configured to be open to the front end side.

[0046] like Fig.15 As shown, in this embodiment, the inner protrusions 722 are formed at four locations on the inner peripheral surface of the sleeve 7. The four inner protrusions 722 are formed at substantially equal intervals in the circumferential direction.

[0047] The four inner protrusions 722 are respectively embedded in the four longitudinal grooves 622. The inner protrusions 722 are joined to the fixed core 62 by welding or the like. The number of the longitudinal grooves 622 and the inner protrusions 722 is not particularly limited, and may be three or less, or five or more, respectively.

[0048] The other structures are the same as those in Embodiment 1. In addition, among the symbols used in Embodiment 2 and thereafter, the same symbols as those used in the previous embodiments represent the same components as those in the previous embodiments, unless otherwise specified.

[0049] In this embodiment, when the sleeve 7 is fixed to the fixed core 62, the sleeve 7 can be slid relative to the outer peripheral surface of the fixed core 62 with the inner protrusion 722 arranged in the longitudinal groove 622. Thus, the fixed position of the sleeve 7 can be adjusted while suppressing the inclination of the sleeve 7 relative to the fixed core 62. Other than this, the same effects as those of the first embodiment can be obtained.

[0050] (Implementation method 3) like Figure 16 to Figure 18 As shown, in this embodiment, an annular space 123 is formed between the front end surface of the step portion 623 of the fixed core 62 and the inner annular portion 723 of the sleeve 7 .

[0051] like Fig.16 , Fig.17 As shown, the fixed core 62 has a step portion 623 formed by cutting the inner side over the entire circumference at the rear end of the outer circumference. Fig.16 , Fig.18 As shown, the sleeve 7 has an inner annular portion 723 protruding toward the inner circumference. Fig.16 As shown, the inner annular portion 723 is disposed on the step portion 623 . Thus, an annular space 123 is formed between the front end surface of the step portion 623 and the inner annular portion 723 . The sleeve 7 is fixed to the outer peripheral surface of the fixed core portion 62 on the front end side of the step portion 623 by welding or the like. The other structures are the same as those in the first embodiment.

[0052] In the present embodiment, an annular space 123 is formed at the rear end of the outer peripheral surface of the fixed core 62. Therefore, foreign matter that may be generated when the sleeve 7 is slid along the outer peripheral surface of the fixed core 62 can be retained in the annular space 123. Therefore, it is possible to prevent the foreign matter from intruding into the core configuration space 102 in the sleeve 7. In addition, even when the sleeve 7 is welded to the fixed core 62, it is possible to prevent foreign matter that may be generated during welding from intruding into the core configuration space 102. Other than this, the same effects as those of the first embodiment are achieved.

[0053] In addition, a combination of the second embodiment and the third embodiment may be adopted. Figure 12 to Figure 15 ) is further provided with a step portion 623 and an inner annular portion 723 (refer to Figure 16 to Figure 18 ) method.

[0054] (Implementation 4) like Figure 19 to Figure 22 As shown, in this embodiment, a facing groove 121 is formed at a position of the magnetic plate 12 facing the front end portion of the sleeve 7 . The facing groove 121 is formed in an annular shape at a position on the front end side of the front end portion of the sleeve 7 .

[0055] When manufacturing the electromagnetic relay 1, the Figure 7 , Figure 8 ) Similarly, the contact pressure between the fixed contact 31 and the movable contact 41 is set to be substantially zero and the position of the movable core 61 relative to the fixed core 62 in the Z direction is adjusted. In this state, the movable core 61 and the shaft 5 are fixed to each other, as shown in FIG. Fig. 20 As shown in FIG. 1 , the sleeve 7 is covered on the movable core 61. Then, the supporting portion 71 is in a state of supporting the rear end portion of the movable core 61.

[0056] In this state, the front end of the sleeve 7 needs to be prevented from interfering with the magnetic plate 12. That is, an adjustment space 110 is required as the position adjustment portion 11. Fig. 20 As shown in FIG. 1 , at least a portion of the adjustment space 110 is formed by providing the relative grooves 121 in the magnetic plate 12. That is, by forming the relative grooves 121, Fig. 20 In this state, a sufficient margin serving as an adjustment space 110 is formed on the front end side of the front end portion of the sleeve 7.

[0057] in addition, Fig. 20 The case where the front end portion of the sleeve 7 is arranged outside the relative groove 121 when the contact pressure is zero is shown, but the front end portion of the sleeve 7 can also be arranged inside the relative groove 121 when the contact pressure is zero.

[0058] In from Fig. 20 When the sleeve 7, the movable core 61 and the shaft 5 are pressed forward together, as shown in FIG. Fig.21 As shown, the front end portion of the sleeve 7 is arranged in the facing groove 121. Since the facing groove 121 is formed with a sufficient depth, the front end portion of the sleeve 7 does not interfere with the magnetic plate 12.

[0059] Then, if Fig. 22 As shown, the sleeve 7 is retracted until the distance between the contacts becomes a predetermined size Gp. That is, the movable core 61 is retracted until the distance between the cores becomes a predetermined size "Gp+Gs". In this state, the sleeve 7 and the fixed core 62 are fixed by welding or the like. The other structures are the same as those in the first embodiment.

[0060] In the case of this embodiment, for example, when the thickness of the magnetic plate 12 is large, it is easy to fully form the adjustment space 110. In addition, especially when the depth of the relative groove 121 exceeds Gp+Gs, the front end of the magnetic plate 12 and the sleeve 7 can be welded in the relative groove 121. If the magnetic plate 12 and the sleeve 7 can be joined and airtightly sealed, it is not necessary to particularly ensure the airtight seal between the magnetic plate 12 and the fixed core 62. In this case, the manufacture of the electromagnetic relay 1 can be simplified. Other than this, the same effects as those of the first embodiment are achieved.

[0061] (Implementation 5) like Figure 23 to Figure 27 As shown, this embodiment is a method in which the fixed core 62 and the sleeve 7 are screwed together. That is, the external thread portion 624 is provided on the outer peripheral surface of the fixed core portion 62 , and the internal thread portion 724 is provided on the inner peripheral surface of the sleeve 7 .

[0062] When manufacturing the electromagnetic relay 1, the Figure 7 , Figure 8 ) Similarly, the contact pressure between the fixed contact 31 and the movable contact 41 is set to be substantially zero and the position of the movable core 61 relative to the fixed core 62 in the Z direction is adjusted. Fig.24 In the illustrated state, the movable core 61 and the shaft 5 are fixed to each other, and the sleeve 7 is covered on the movable core 61 .

[0063] Then, if Fig.25 , Fig.26 As shown, while the support portion 71 supports the rear end of the movable core 61, the sleeve 7 screwed with the fixed core 62 is rotated and advanced. Fig.26 As shown, the sleeve 7 is rotated and advanced until the fixed core 62 abuts against the movable core 61. Fig.26 The state starts to make the sleeve 7 rotate in the opposite direction, such as Fig. 27 As shown, the sleeve 7 is retracted until the gap between the contact points becomes a predetermined value Gp. That is, the sleeve 7 is retracted until the gap between the fixed core 62 and the movable core 61 becomes Gp+Gs. Then, in this state, the sleeve 7 and the fixed core 62 are fixed by welding or the like. The other structures are the same as those in the first embodiment.

[0064] In the present embodiment, since the fixed core 62 and the sleeve 7 are screwed together, the position adjustment between the two in the Z direction can be easily performed. Other than this, the same effects as those of the first embodiment are achieved.

[0065] (Implementation 6) like Figure 28 to Figure 32 As shown, in this embodiment, an easily deformable portion 111 is provided at the front end of the sleeve 7. The easily deformable portion 111 is a portion that is more easily compressively deformed in the Z direction than other portions of the side wall portion 720, and its deformation is plastic deformation.

[0066] In the present embodiment, the easily deformable portion 111 constitutes the position adjusting portion 11. The easily deformable portion 111 is formed by making the thickness of the front end portion of the side wall portion 720 of the sleeve 7 smaller than that of other portions of the side wall portion 720.

[0067] When manufacturing the electromagnetic relay 1, first, similarly to the first embodiment, Fig.29 As shown, the fixed contact 31 and the movable contact 41 are set to abut each other under a contact pressure of zero, and then the movable core 61 is assembled to the shaft 5. At this time, the movable core 61 is assembled to the shaft 5 while adjusting the core distance between the movable core 61 and the fixed core 62 to Gs.

[0068] Then, if Fig.30 As shown in FIG. 1 , the sleeve 7 is covered on the movable core 61 from behind. At this stage, the sleeve 7 is formed into a shape in which the easily deformable portion 111 is parallel to the Z direction. In addition, at this stage, the movable contact 41 is away from the fixed contact 31, and the core distance between the movable core 61 and the fixed core 62 is greater than Gp+Gs. Then, as shown in FIG. Fig.31As shown in FIG. 1 , the sleeve 7 is further advanced while the movable core 61 is supported by the support portion 71. At this time, the sleeve 7 is also forcibly advanced after the easily deformable portion 111 of the sleeve 7 abuts against the magnetic plate 12. Then, as shown in the figure, the easily deformable portion 111 is plastically deformed.

[0069] Afterwards, if Fig.32 As shown, the sleeve 7 is advanced together with the movable core 61 until the distance between the contacts becomes Gp. Here, the distance between the contacts can be measured by directly observing the distance between the fixed contact 31 and the movable contact 41 using X-rays or the like. Alternatively, a method can be adopted in which the gap between the fixed core 62 and the movable core 61 is observed using X-rays or the like and the sleeve 7 is advanced until the gap becomes Gp+Gs.

[0070] Then, in this state, the contact portion of the sleeve 7 with the magnetic plate 12 is fixed to the magnetic plate 12 by welding or the like (see Fig.28 ). In addition, the easily deformable portion 111 may be provided by various methods other than by reducing the thickness. For example, the easily deformable portion 111 may be provided by forming a shape such as a corrugated shape that is easily compressively deformed in the Z direction before plastic deformation. The other structures are the same as those in the first embodiment.

[0071] In the present embodiment, the entire circumference of the front end of the sleeve 7 is welded to the magnetic plate 12, etc., so that the airtight seal between the two can be achieved. Therefore, it is not necessary to ensure the airtight seal between the fixed core 62 and the magnetic plate 12. In this case, the manufacture of the electromagnetic relay 1 can be simplified. Other than this, the same effects as those of the first embodiment are achieved.

[0072] In Embodiment 1, Embodiment 4, and Embodiment 5, as in Embodiment 6, the distance between contacts or the distance between cores can be monitored by using X-rays or the like to adjust the distance between contacts during manufacturing. In this case, after the sleeve 7 is covered on the movable core 61, there is no need to move the sleeve 7 together with the movable core 61 and the shaft 5 forward in a manner that applies contact pressure (i.e., Fig.10 That is, from the state where the contact pressure is zero (i.e. Fig. 9 Starting from the state shown in the figure, the sleeve 7 is retracted while monitoring the distance between contacts or the distance between cores using X-rays, etc. until these values ​​become specified values, thereby being able to adjust the distance between contacts to the desired value.

[0073] Furthermore, in each of the above-described embodiments, the fixed core 62 and the magnetic plate 12 are formed of different members, but an integral member of the two may be used.

[0074] The present disclosure is not limited to the above-described embodiments, and can be applied to various embodiments without departing from the gist of the present disclosure.

[0075] Although the present disclosure is described according to the embodiments, it should be understood that the present disclosure is not limited to the embodiments and structures. The present disclosure also includes various modifications and variations within the equivalent range. In addition, various combinations and methods, and other combinations and methods including only one element, above or below them, also belong to the scope and thought range of the present disclosure.

Claims

1. An electromagnetic relay, the electromagnetic relay (1) comprising: Sealing housing (2); A fixed contact (31), the fixed contact being arranged in the sealed housing; A movable member (4), the movable member having a movable contact (41) that contacts and separates relative to the fixed contact in the sealed housing; a shaft (5) which holds the movable element and is arranged to be able to move forward and backward in the axial direction relative to the sealing housing; a movable core (61), the movable core being fixed to the shaft; A fixed core (62), the fixed core being fixed to the sealing housing; a return spring (63), the return spring applying force to the movable contact in a direction away from the fixed contact; an electromagnetic coil (64) which generates a magnetic attraction force between the fixed core and the movable core by energizing the electromagnetic coil; and a sleeve (7) which hermetically seals the return spring and the movable core and is directly or indirectly fixed to the fixed core, The shaft is inserted into a through hole (621) formed in the fixed core in a slidable manner. The sleeve has a support portion (71) which supports the movable core in a manner that limits the position of the movable core relative to the fixed core when the magnetic attraction force is not in effect. A position adjustment portion (11) is formed at the front end portion of the sleeve, and the position adjustment portion is used to adjust the positional relationship between the fixed core and the support portion when the sleeve is directly or indirectly fixed to the fixed core.

2. The electromagnetic relay according to claim 1, characterized in that: A space (110) is adjacent to the front end side of the front end portion of the sleeve.

3. The electromagnetic relay according to claim 2, characterized in that: The outer peripheral surface of the fixed core is a surface parallel to the advancing and retreating direction of the movable core, and the sleeve is engaged with the outer peripheral surface of the fixed core.

4. The electromagnetic relay according to claim 3, characterized in that: A longitudinal groove portion continuous in the axial direction is formed on the outer peripheral surface of the stationary core portion, and the sleeve has an inner protrusion portion protruding toward the inner peripheral side, and the inner protrusion portion is arranged in the longitudinal groove portion.

5. The electromagnetic relay according to claim 3 or 4, characterized in that: The fixed core has a step portion formed by cutting out the inner side over the entire circumference at the rear end portion of the outer circumferential surface, and the sleeve has an annular inner annular portion protruding toward the inner circumference, which is arranged on the step portion, and an annular space is formed between the front end surface of the step portion and the inner annular portion.

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