Electromagnetic relays

Abstract

To provide an electromagnetic relay that has a current detection function and can reduce manufacturing costs by preventing an increase in the number of parts and manufacturing processes. [Solution] The first load terminal 30 and the second load terminal 40 are formed of conductors. The second load terminal 40 operates together with the armature 20 which is operated by the magnetic field generated by the electromagnetic coil 10, and contacts and separates from the first load terminal 30. The shunt resistor 50 is formed on a part of either the first load terminal 30 or the second load terminal 40. One end of the shunt resistor 50 is connected to a predetermined first position 51 on the load terminal, and the other end is connected to a second position 52 on the load terminal which is offset from the first position 51 in the longitudinal direction of the load terminal, and the cross-sectional area S1 perpendicular to the longitudinal direction is formed to be smaller than the cross-sectional area S2 of the load terminal.

Description

Technical Field

[0001] The present disclosure relates to an electromagnetic relay.

Background Art

[0002] Conventionally, as an electromagnetic relay provided in an electric circuit connecting a power source and a load, there is known one that opens and closes the electric circuit by controlling the contact and separation of fixed contacts and movable contacts respectively connected to two load terminals by energization control of an electromagnetic coil.

[0003] The electromagnetic relay described in Patent Document 1 has a function of detecting the current flowing through a load terminal by providing a coil so as to surround the outside of the load terminal and measuring the current flowing through the coil. In Patent Document 1, the load terminal is called a fixed contactor.

[0004] The electromagnetic relay described in Patent Document 2 has a function of detecting the current flowing through a load terminal by joining a shunt resistance portion formed of a metal material having a larger electric resistance value than the metal material forming the load terminal in the middle of the load terminal and measuring the potential difference between both ends of the shunt resistance portion. The circuit provided with this electromagnetic relay is configured to open the contacts of the electromagnetic relay when it is detected that an overcurrent flows through the load terminal, thereby protecting the load from the overcurrent. In Patent Document 2, the load terminal is called a bus bar.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] [[ID=—]] However, the electromagnetic relay described in Patent Document 1 has problems such as an increased number of parts, a more complex manufacturing process, and increased manufacturing costs because a coil is provided outside the load terminals for current detection. Similarly, the electromagnetic relay described in Patent Document 2 also has problems such as an increased number of parts, a more complex manufacturing process, and increased manufacturing costs because a metal material with high electrical resistance is joined in the middle of the load terminals for current detection.

[0007] In view of the above, this disclosure aims to provide an electromagnetic relay that has a current detection function and can reduce manufacturing costs by preventing an increase in the number of parts and manufacturing processes. [Means for solving the problem]

[0008] According to one aspect of this disclosure, an electromagnetic relay is, An electromagnetic coil (10) that generates a magnetic field when an electric current is applied, An armature (20) that operates due to the magnetic field generated by an electromagnetic coil, A first load terminal (30) formed by a conductor, A second load terminal (40) formed of a conductor, which operates together with the armature and makes contact with and separates from the first load terminal, It includes a shunt resistor (50) formed on a part of either the first or second load terminal, The shunt resistor is connected at one end to a predetermined first position (51) of the load terminals, and at the other end to a second position (52) of the load terminals which is offset from the first position in the longitudinal direction of the load terminals, and its cross-sectional area (S1) perpendicular to the longitudinal direction is formed to be smaller than the cross-sectional area (S2) of the load terminals.

[0009] According to this, by forming a portion with a reduced cross-sectional area on a part of the load terminal, it is possible to make that portion a shunt resistor. By measuring the potential difference across both ends of the shunt resistor, the current flowing through the load terminal can be detected. Therefore, the electromagnetic relay according to one aspect of this disclosure does not require a coil for current detection as described in Patent Document 1, nor a metal material with high electrical resistance as described in Patent Document 2. Consequently, the electromagnetic relay according to one aspect of this disclosure can prevent an increase in the number of parts and manufacturing processes compared to Patent Documents 1 and 2, and can reduce manufacturing costs.

[0010] According to another aspect of this disclosure, an electromagnetic relay is, An electromagnetic coil (10) that generates a magnetic field when an electric current is applied, An armature (20) that operates due to the magnetic field generated by an electromagnetic coil, A first load terminal (30) formed by a conductor, A second load terminal (40) formed of a conductor, which operates together with the armature and makes contact with and separates from the first load terminal, The device includes a detection terminal (70) connected to either the first or second load terminal at a position (56) closer to the contact point (34, 44) between the first and second load terminals than halfway along its length.

[0011] According to this, by increasing the distance from the point where the load terminal and the detection terminal are connected to the end of the load terminal opposite the contact, it is possible to make a portion of the load terminal a shunt resistor. By measuring the potential difference between the end of the load terminal opposite the contact and the detection terminal, the current flowing through the load terminal can be detected. Therefore, electromagnetic relays according to another aspect of this disclosure can also prevent an increase in the number of parts and manufacturing processes, and reduce manufacturing costs, compared to Patent Documents 1 and 2.

[0012] The reference numerals in parentheses attached to each component indicate an example of the correspondence between that component and the specific components described in the embodiments described later. [Brief explanation of the drawing]

[0013] [Figure 1] It is a perspective view excluding the case of the electromagnetic relay according to the first embodiment. [Figure 2] It is a cross-sectional view including the case of the electromagnetic relay taken along line II-II of FIG. 1. [Figure 3] It is an enlarged view of a first load terminal and the like included in the electromagnetic relay according to the first embodiment. [Figure 4] It is a cross-sectional view taken along line IV-IV of FIG. 3. [Figure 5] It is a circuit diagram of the electromagnetic relay according to the first embodiment. [Figure 6] It is a perspective view excluding the case of the electromagnetic relay according to the second embodiment. [Figure 7] It is an enlarged view of a first load terminal and the like included in the electromagnetic relay according to the second embodiment. [Figure 8] It is a circuit diagram of the electromagnetic relay according to the second embodiment.

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference numerals, and the description thereof will be omitted.

[0015] (First Embodiment) The first embodiment will be described. The electromagnetic relay of the first embodiment includes, in addition to a mechanism for opening and closing a circuit that connects a power source and a load of an electrical circuit (not shown), a shunt resistance portion as a current detection resistance portion for detecting a current value supplied from the power source to the load via the electromagnetic relay, which is integrally formed.

[0016] Figures 1 and 2 show an example of an electromagnetic relay 1. As shown in Figures 1 and 2, the electromagnetic relay 1 includes an electromagnetic coil 10, an armature 20, a first load terminal 30, a second load terminal 40, a shunt resistor 50, a first detection terminal 61, a second detection terminal 62, and a base 80. The electromagnetic coil 10, armature 20, first load terminal 30, second load terminal 40, shunt resistor 50, first detection terminal 61, and second detection terminal 62 are directly or indirectly fixed to the base 80, and these are covered by a case 81. The electromagnetic relay 1 is mounted on a circuit board 90.

[0017] The electromagnetic coil 10 includes a spool 11, a coil 12, a core 13, and a yoke 14. The spool 11 has a cylindrical tube portion 111, a bottom plate portion 112 provided on one side in the direction in which the axis CL of the tube portion 111 extends, and an upper plate portion 113 provided on the other side in the direction in which the axis CL of the tube portion 111 extends. Hereinafter, the direction in which the axis CL of the tube portion 111 extends will be referred to as the "axial direction". The coil 12 is wound around the outside of the tube portion 111 of the spool 11. One end of the wire forming the coil 12 is electrically connected to a first coil terminal 15, and the other end is electrically connected to a second coil terminal (not shown). The first coil terminal 15 and the second coil terminal are fixed to a base 80. The ends 151 of the first coil terminal 15 and the second coil terminal opposite to the side to which the wire of the coil 12 is connected extend outward from the base 80.

[0018] The core 13 is formed in a cylindrical shape from a magnetic material and is inserted inside the cylindrical portion 111 of the spool 11. The portion of the core 13 that protrudes axially from the cylindrical portion 111 of the spool 11 is fixed to the yoke 14. The portion of the core 13 that protrudes axially from the cylindrical portion 111 of the spool 11 faces the armature 20.

[0019] The yoke 14 is formed in an L-shape from a magnetic material and has a bottom yoke 141 fixed to the base 80, and a vertical yoke 142 extending axially from the bottom yoke 141. The bottom plate portion 112 of the spool 11 is positioned on the side of the bottom yoke 141, and the top plate portion 113 of the spool 11 is positioned on the opposite side from the bottom yoke 141.

[0020] A first load terminal 30 is provided on the opposite side of the coil 12 from the vertical yoke 142. The first load terminal 30 is made of a conductor and is bent into an L-shape. The portion of the first load terminal 30 that extends in the axial direction is called the base portion 31, the bent portion is called the bent portion 32, and the portion that extends perpendicular to the axial direction is called the extended portion 33. A part of the base portion 31 of the first load terminal 30 is fixed to the base 80. The end portion 301 of the base portion 31 of the first load terminal 30 that is opposite to the bent portion 32 extends outward from the base 80. The portion of the base portion 31 of the first load terminal 30 that is on the bent portion 32 side is inserted through a hole 114 provided in the upper plate portion 113 of the spool 11. The extended portion 33 of the first load terminal 30 is provided parallel to the upper plate portion 113 of the spool 11. A fixed contact 34 is provided on the extension portion 33 of the first load terminal 30, on the side opposite to the bent portion 32. The fixed contact 34 protrudes from the extension portion 33 of the first load terminal 30 toward the movable contact 44. A shunt resistor portion 50 is formed on a part of the extension portion 33 of the first load terminal 30. The shunt resistor portion 50 will be described later.

[0021] The second load terminal 40 has a base terminal 41 and a spring terminal 42. Both the base terminal 41 and the spring terminal 42 are made of conductors and are connected by soldering or welding. A portion of the base terminal 41 is fixed to the base 80. The end 401 of the base terminal 41 opposite to the spring terminal 42 extends outward from the base 80.

[0022] The spring terminal 42 is crimped and fixed to the vertical yoke 142. The portion of the spring terminal 42 that protrudes from the vertical yoke 142 on the side opposite to the base 80 is bent so as to face the core 13 and fixed contact 34 of the electromagnetic coil 10. The spring terminal 42 is restricted by a stopper 43 from moving away from the core 13 (i.e., to the other axial direction). A movable contact 44 is provided on the portion of the spring terminal 42 that faces the fixed contact 34. The movable contact 44 protrudes from the spring terminal 42 toward the fixed contact 34. An armature 20 is also crimped and fixed to the portion of the spring terminal 42 that faces the core 13. The armature 20 is made of a magnetic material. The armature 20 has an L-shaped projection 21 on its outer edge on the vertical yoke 142 side. The armature 20 is provided so as to be able to swing with the contact point with the vertical yoke 142 as the pivot point.

[0023] With the above configuration, when current is supplied to coil 12 from the first coil terminal 15 and the second coil terminal, the magnetic field generated by coil 12 causes magnetic flux to flow through the magnetic circuit composed of the core 13, yoke 14, and armature 20. As a result, the armature 20 is magnetically attracted to the core 13 against the elastic force of the spring terminal 42, and the movable contact 44 and the fixed contact 34 come into contact. Consequently, the circuit connecting the power supply (not shown) and the load (not shown) is closed, and current flows through the first load terminal 30, the fixed contact 34, the movable contact 44, and the second load terminal 40 (i.e., the spring terminal 42 and the base terminal 41).

[0024] Conversely, when the current flow from the first coil terminal 15 and the second coil terminal to the coil 12 is stopped, the magnetic field of the coil 12 disappears. As a result, the elastic force of the spring terminal 42 causes the armature 20 to separate from the core 13, and the movable contact 44 and the fixed contact 34 separate. Consequently, the circuit connecting the power supply (not shown) and the load (not shown) opens, and the current flow at the first load terminal 30, the fixed contact 34, the movable contact 44, and the second load terminal 40 (i.e., the spring terminal 42 and the base terminal 41) is interrupted.

[0025] Next, the shunt resistor section 50, which serves as a current detection resistor in the electromagnetic relay 1 of the first embodiment, will be described. As shown in Figures 1 and 3, the shunt resistor section 50 is formed in a part of the extension section 33 of the first load terminal 30. Specifically, the extension section 33 of the first load terminal 30 is provided with an elongated hole 35 that penetrates in the thickness direction. The elongated hole 35 extends in the length direction of the extension section 33. One side of the first load terminal 30 in the width direction, with the elongated hole 35 in between, is the shunt resistor section 50, and the other side in the width direction is the main body 331 of the extension section 33 of the first load terminal 30. The main body 331 of the extension section 33 of the first load terminal 30 and the shunt resistor section 50 are connected in parallel with the elongated hole 35 in between.

[0026] One end of the shunt resistor 50 is connected to a predetermined first position 51 in the extension 33, and the other end of the shunt resistor 50 is connected to a second position 52 in the extension 33, which is offset from the first position 51 in the longitudinal direction of the extension 33. Specifically, the first position 51 is closer to the fixed contact 34 side than to the center of the extension 33. The second position 52 is closer to the bent portion 32 side than to the center of the extension 33. The first load terminal 30 and the shunt resistor 50 are formed continuously from the same material.

[0027] As shown in Figure 4, the cross-sectional area S1 perpendicular to the length direction in the shunt resistance section 50 is smaller than the cross-sectional area S2 perpendicular to the length direction in the main body 331 of the extension section 33. Therefore, the shunt resistance section 50 has a higher electrical resistance value than the main body 331 of the extension section 33.

[0028] As shown in Figures 1 and 3, one end of the first detection terminal 61 is connected to the third position 53 of the shunt resistor 50. The third position 53 is a position in the shunt resistor 50 that is closer to the first position 51 than to the second position 52. A portion of the first detection terminal 61 is fixed to the base 80. The end 611 of the first detection terminal 61 opposite to the third position 53 extends outward from the base 80.

[0029] Furthermore, one end of the second detection terminal 62 is connected to the fourth position 54 of the shunt resistor 50. The fourth position 54 is a position in the shunt resistor 50 that is closer to the second position 52 than to the first position 51. A portion of the second detection terminal 62 is fixed to the base 80. The end 621 of the second detection terminal 62 opposite to the fourth position 54 extends outward from the base 80.

[0030] The first detection terminal 61 and the second detection terminal 62 are formed in parallel. Therefore, the lengths of the first detection terminal 61 and the second detection terminal 62 are the same. The cross-sectional area of ​​the first detection terminal 61 and the cross-sectional area of ​​the second detection terminal 62 are the same. Therefore, the electrical resistance values ​​of the first detection terminal 61 and the second detection terminal 62 are the same. In this disclosure, "parallel" includes not only perfect parallelism but also slight deviations due to manufacturing tolerances, etc. Also, in this disclosure, "identical" includes not only perfect identicalness but also slight deviations due to manufacturing tolerances, etc.

[0031] The first load terminal 30, the shunt resistor 50, the first detection terminal 61, and the second detection terminal 62 are formed continuously from the same conductive material. The first load terminal 30, the shunt resistor 50, the first detection terminal 61, and the second detection terminal 62 can be formed, for example, by press working.

[0032] As shown in Figure 2, the electromagnetic relay 1 of the first embodiment is mounted on a circuit board 90. Specifically, the ends 151, 301, 401, 611, and 621 of the first coil terminal 15, second coil terminal, first load terminal 30, second load terminal 40, first detection terminal 61, and second detection terminal 62 of the electromagnetic relay 1 that extend from the base 80 to the side opposite the case 81 are all fixed to the wiring pattern of the circuit board 90 by solder. The circuit board 90 is provided with a current measuring unit 91 that detects the current flowing through the first load terminal 30. The current measuring unit 91 is composed of, for example, a microcomputer or IC (integrated circuit) that includes a processor that performs control processing and calculation processing, and a memory such as ROM or RAM that stores programs and data. The memory of the current measuring unit 91 is pre-programmed with the electrical resistance values ​​of the shunt resistor 50 and the extension 33.

[0033] Here, Figure 5 shows the circuit diagram of the electromagnetic relay 1 of the first embodiment. As shown in Figure 5, the electromagnetic relay 1 is configured such that the armature 20 and spring terminal 42 operate by controlling the energization of the electromagnetic coil 10, causing the movable contact 44 and fixed contact 34 to make contact and separate. The electromagnetic relay 1 has the main body 331 of the extension portion 33 of the first load terminal 30 and the shunt resistor portion 50 connected in parallel, and the potential difference across both ends of the shunt resistor portion 50 can be measured by the first detection terminal 61 and the second detection terminal 62. The potential difference across both ends of the shunt resistor portion 50 is measured by a current measuring unit 91 provided on the circuit board 90. The current measuring unit 91 measures the potential difference across both ends of the shunt resistor portion 50 and detects the current value flowing through the shunt resistor portion 50 according to Ohm's law. The current measuring unit 91 can detect the current flowing to the first load terminal 30 based on the ratio of the electrical resistance value of the shunt resistor 50 to the electrical resistance value of the extension 33 and the current value flowing through the shunt resistor 50.

[0034] The electromagnetic relay 1 of the first embodiment described above provides the following effects. (1) The electromagnetic relay 1 of the first embodiment is provided with a shunt resistor 50 in part of the first load terminal 30. One end of the shunt resistor 50 is connected to a first position 51 of the first load terminal 30 and the other end is connected to a second position 52 of the first load terminal 30, and the cross-sectional area S1 perpendicular to the length direction is formed to be smaller than the cross-sectional area S2 of the first load terminal 30. According to this, by forming a portion with a reduced cross-sectional area on a part of the first load terminal 30, the electrical resistance of that portion can be increased, making that portion a shunt resistor 50. By measuring the potential difference across the shunt resistor 50, the current flowing through the first load terminal 30 can be detected. Therefore, this electromagnetic relay 1 does not require a coil for current detection as described in Patent Document 1, nor a metal material with high electrical resistance as described in Patent Document 2. Consequently, this electromagnetic relay 1 can prevent an increase in the number of parts and manufacturing processes compared to Patent Documents 1 and 2, thereby reducing manufacturing costs.

[0035] (2) The electromagnetic relay 1 of the first embodiment includes a first detection terminal 61 connected to the third position 53 of the shunt resistance section 50 and a second detection terminal 62 connected to the fourth position 54 of the shunt resistance section 50. According to this, the current value flowing through the first load terminal 30 can be detected by measuring the potential difference between the first detection terminal 61 and the second detection terminal 62.

[0036] (3) In the first embodiment, the first load terminal 30 and the shunt resistor 50 are formed continuously from the same material. According to this, there is no need to add parts to provide the shunt resistor section 50, and the manufacturing process is simplified, thus reducing manufacturing costs.

[0037] (4) In the first embodiment, the first load terminal 30, the shunt resistor 50, the first detection terminal 61, and the second detection terminal 62 are formed continuously from the same material. According to this, there is no need to add parts to provide the shunt resistor 50, the first detection terminal 61, and the second detection terminal 62 to the first load terminal 30 of the electromagnetic relay 1, and the manufacturing process is simplified, thus reducing manufacturing costs.

[0038] (5) In the first embodiment, the first load terminal 30 and the shunt resistor 50 are connected in parallel with an elongated hole 35 extending in the longitudinal direction of the extension portion 33 of the first load terminal 30 in between. According to this, the first load terminal 30 and the shunt resistor 50 can be integrally formed from the same material using a simple manufacturing process such as press working.

[0039] (6) In the first embodiment, the first detection terminal 61 and the second detection terminal 62 are provided in parallel, and the ends 611 and 621 opposite to the part connected to the shunt resistor 50 extend to the outside via the base 80. According to this, it becomes possible to make the lengths of the first detection terminal 61 and the second detection terminal 62 the same. Therefore, by making the electrical resistance values ​​of the first detection terminal 61 and the second detection terminal 62 the same, the accuracy of current detection can be improved.

[0040] (Second Embodiment) A second embodiment will now be described. The second embodiment is the same as the first embodiment except that the configuration of the shunt resistor and the detection terminal has been changed. Therefore, only the parts that differ from the first embodiment will be described.

[0041] As shown in Figures 6 and 7, in the electromagnetic relay 1 of the second embodiment, a portion of the first load terminal 30 functions as a shunt resistor 55 that acts as a current detection resistor. Specifically, the portion of the first load terminal 30 that functions as a shunt resistor 55 is the portion from the position 56 where the first load terminal 30 and the detection terminal 70 are connected to the end 301 of the first load terminal 30 opposite to the fixed contact 34. Therefore, it can be said that the first load terminal 30 and the shunt resistor 55 are formed continuously from the same material.

[0042] One end of the detection terminal 70 is connected to the first load terminal 30 at a position 56 that is closer to the fixed contact 34 than the halfway point in the length direction. More specifically, the detection terminal 70 is connected to the extension 33 of the first load terminal 30 at the halfway point in the length direction, or to a position closer to the fixed contact 34 than that point. This makes the portion of the first load terminal 30 that functions as a shunt resistor 55 longer, and increases the electrical resistance value of the shunt resistor 55. A portion of the detection terminal 70 is fixed to the base 80. The end 701 of the detection terminal 70 opposite to the portion connected to the first load terminal 30 extends outward from the base 80.

[0043] The first load terminal 30 (i.e., including the shunt resistance portion 55) and the detection terminal 70 are formed continuously from the same conductive material. The first load terminal 30 (i.e., including the shunt resistance portion 55) and the detection terminal 70 can be formed, for example, by press working.

[0044] The electromagnetic relay 1 of the second embodiment is also mounted on the circuit board 90. Specifically, the ends 151, 301, 401, and 701 of the first coil terminal 15, second coil terminal, first load terminal 30, second load terminal 40, and detection terminal 70 of the electromagnetic relay 1 that extend from the base 80 to the side opposite the case 81 are all fixed to the wiring pattern of the circuit board 90 by solder. The circuit board 90 is provided with a current measuring unit 91. The memory of the current measuring unit 91 is pre-programmed with the electrical resistance value of the shunt resistor 55 and the like.

[0045] Here, Figure 8 shows the circuit diagram of the electromagnetic relay 1 of the second embodiment. As shown in Figure 8, the electromagnetic relay 1 is configured to measure the potential difference across the portion of the first load terminal 30 that functions as a shunt resistor 55. Specifically, the electromagnetic relay 1 is configured to measure the potential difference between the end 301 of the first load terminal 30 opposite to the fixed contact 34 and the detection terminal 70. The potential difference across the shunt resistor 55 is measured by a current measuring unit 91 provided on the circuit board 90. The current measuring unit 91 measures the potential difference across the shunt resistor 55 and can detect the current value flowing through the first load terminal 30 that functions as a shunt resistor 55 using Ohm's law.

[0046] The electromagnetic relay 1 of the second embodiment described above provides the following effects. (1) The electromagnetic relay 1 of the second embodiment is equipped with a detection terminal 70 that is connected to a position 56 on the first load terminal 30 that is closer to the fixed contact 34 than the position halfway along the length. According to this, by lengthening the portion of the first load terminal 30 from the position 56 where the first load terminal 30 and the detection terminal 70 are connected to the end 301 of the first load terminal 30 opposite to the fixed contact 34, and increasing the electrical resistance of that portion, it is possible to make a part of the first load terminal 30 a shunt resistor 55. Then, by measuring the potential difference between the end 301 of the first load terminal 30 opposite to the fixed contact 34 and the detection terminal 70, the current value flowing through the first load terminal 30 that functions as a shunt resistor 55 can be detected. Therefore, this electromagnetic relay 1 does not require a coil for current detection as described in Patent Document 1, nor a metal material with high electrical resistance as described in Patent Document 2. Consequently, this electromagnetic relay 1 also prevents an increase in the number of parts and manufacturing processes compared to Patent Documents 1 and 2, and reduces manufacturing costs.

[0047] (2) In the second embodiment, the electromagnetic relay 1 has the first load terminal 30 and the detection terminal 70 formed continuously from the same material. According to this, there is no need to add parts to provide the shunt resistor 55 and the detection terminal 70, and the manufacturing process is simplified, thus reducing manufacturing costs.

[0048] (3) In the electromagnetic relay 1 of the second embodiment, the end 301 of the first load terminal 30 opposite to the fixed contact 34 extends to the outside via the base 80. Also, the end 701 of the detection terminal 70 opposite to the part connected to the first load terminal 30 extends to the outside via the base 80. According to this, by measuring the potential difference between the end 301 of the first load terminal 30 opposite to the fixed contact 34 and the detection terminal 70, the current value flowing through the first load terminal 30, which functions as a shunt resistor 55, can be detected. Furthermore, the electromagnetic relay 1 of the second embodiment simplifies the wiring pattern of the circuit board 90 by having only one detection terminal 70, thereby reducing design and manufacturing costs.

[0049] (Other embodiments) (1) In the above embodiments, the electromagnetic relay 1 was described as being mounted on a circuit board 90 as an example, but it is not limited to this, and for example, the electromagnetic relay 1 may be mounted on a relay box in a vehicle or the like.

[0050] (2) In the above embodiments, the shunt resistors 50 and 55 were described as being formed in part of the first load terminal 30, but the invention is not limited to this, and for example, the shunt resistors 50 and 55 may be formed in part of the second load terminal 40.

[0051] (3) In each of the above embodiments, the shunt resistors 50, 55 and the detection terminals 61, 62, 70 are formed continuously from the same material, but the invention is not limited to this, and for example, the shunt resistors 50, 55 and the detection terminals 61, 62, 70 may be connected by welding or the like.

[0052] This disclosure is not limited to the embodiments described above, and modifications may be made as appropriate within the scope of the claims. Furthermore, the embodiments and parts thereof are not unrelated to each other and can be combined as appropriate, except in cases where the combination is clearly impossible. In addition, it goes without saying that the elements constituting the embodiments are not necessarily essential, except in cases where they are explicitly stated to be particularly essential or where they are clearly considered essential in principle. Furthermore, in the embodiments, when numerical values ​​such as the number, numerical values, quantities, or ranges of the components of the embodiments are mentioned, the embodiments are not limited to those specific numbers, except in cases where they are explicitly stated to be particularly essential or where they are clearly limited to a specific number in principle. Furthermore, when the shapes, positional relationships, etc., of the components, etc., are mentioned in the embodiments, the embodiments are not limited to those shapes, positional relationships, etc., except in cases where they are explicitly stated to be particularly essential or where they are clearly limited to a specific shape, positional relationship, etc., in principle. [Explanation of Symbols]

[0053] 1 Electromagnetic relay 10 Electromagnetic coils 20 Armatures 30 1st load terminal (load terminal) 40 2nd load terminal (load terminal) 50 Shunt Resistor 51 1st position 52 2nd position

Claims

1. In electromagnetic relays, An electromagnetic coil (10) that generates a magnetic field when an electric current is applied, An armature (20) that operates due to the magnetic field generated by the electromagnetic coil, A first load terminal (30) formed by a conductor, A second load terminal (40) is formed of a conductor, operates together with the armature, and makes contact with and separates from the first load terminal, The device includes a shunt resistance portion (50) formed on a part of either the first or second load terminal, The shunt resistor is an electromagnetic relay in which one end is connected to a predetermined first position (51) of the load terminals, and the other end is connected to a second position (52) of the load terminals which is offset from the first position in the longitudinal direction of the load terminals, and the cross-sectional area (S1) perpendicular to the longitudinal direction is formed to be smaller than the cross-sectional area (S2) of the load terminals.

2. A first detection terminal (61) is connected to a third position (53) of the shunt resistor, which is closer to the first position than the second position, The electromagnetic relay according to claim 1, further comprising a second detection terminal (62) connected to a fourth position (54) of the shunt resistance portion that is closer to the second position than the first position.

3. The electromagnetic relay according to claim 1 or 2, wherein the load terminal and the shunt resistance portion are formed continuously from the same material.

4. The electromagnetic relay according to claim 2, wherein the load terminal, the shunt resistor, the first detection terminal, and the second detection terminal are continuously formed from the same material.

5. Between the load terminal and the shunt resistor, an elongated hole (35) is provided that penetrates in the thickness direction of the load terminal. The aforementioned elongated hole extends in the longitudinal direction of the load terminal, The electromagnetic relay according to claim 1 or 2, wherein the load terminal and the shunt resistor are connected in parallel with the elongated hole in between.

6. The system further comprises a base (80) to which the first load terminal, the second load terminal, the first detection terminal, and the second detection terminal are fixed. The electromagnetic relay according to claim 2, wherein the first detection terminal and the second detection terminal are provided in parallel, and the ends (611, 621) opposite to the portion connected to the shunt resistor extend to the outside via the base.

7. In electromagnetic relays, An electromagnetic coil (10) that generates a magnetic field when an electric current is applied, An armature (20) that operates due to the magnetic field generated by the electromagnetic coil, A first load terminal (30) formed by a conductor, A second load terminal (40) is formed of a conductor, operates together with the armature, and makes contact with and separates from the first load terminal, An electromagnetic relay comprising a detection terminal (70) connected to either the first or second load terminal at a position (56) closer to the contact point (34, 44) between the first and second load terminals than halfway along the length.

8. The electromagnetic relay according to claim 7, wherein the load terminal and the detection terminal are formed continuously from the same material.

9. The system further comprises a base (80) to which the load terminal and the detection terminal are fixed. The load terminal has an end (701) opposite to the contact that extends to the outside via the base, The electromagnetic relay according to claim 7 or 8, wherein the end (701) of the detection terminal opposite to the part connected to the load terminal extends to the outside via the base.

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