Cutting device

Abstract

A cutting device (10) is provided with a resin member (4), an igniter (2), and a conductor (3). The resin member has an internal space (400). The igniter fills the internal space with gas. The electric conductor is in a plate shape and located below the igniter. The conductor has a first holding part (34) embedded in the resin member, a second holding part (35) embedded in the resin member, and a connecting part (36) connecting the first holding part and the second holding part. The first holding portion has a through hole (344).

Description

Technical Field

[0001] The present disclosure generally relates to a cut-off device. More specifically, the present disclosure relates to a cut-off device including an igniter. Background Art

[0002] A cutting device is disclosed in Patent Document 1. The cutting device includes a casing as a casing member, an igniter, an emitter, and a conductor.

[0003] The housing has a storage space extending from the upper end side to the lower end side. The storage space is a space formed in a linear shape so that the projectile can move. The projectile is emitted along the storage space using the energy received from the igniter. The conductor has a cut-off portion cut off by the projectile moving using the energy received from the igniter. The conductor is arranged so that the cut-off portion crosses the storage space.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2022-104372 Summary of the invention

[0007] In the cutting device described in Patent Document 1, if the cut-off portion is cut off while current is flowing through the conductor, arc discharge may occur. Therefore, in the cutting device, conductive gas generated by arc discharge may leak to the outside of the housing. If the conductive gas generated by arc discharge leaks to the outside of the cutting device, there is a possibility of causing adverse effects such as insulation degradation of external components.

[0008] An object of the present disclosure is to make it difficult for gas based on the electrical conductivity of an arc to leak to the outside of a cutting device.

[0009] A cutting device according to one embodiment of the present disclosure comprises a resin member, an igniter, and a conductor. The resin member has an internal space. The igniter fills the internal space with gas. The conductor is plate-shaped and is located below the igniter. The conductor comprises: a first retaining portion embedded in the resin member; a second retaining portion embedded in the resin member; and a connecting portion connecting the first retaining portion and the second retaining portion. The first retaining portion has a through hole.

[0010] According to the present disclosure, there is an advantage that gas based on the electrical conductivity of the arc can be prevented from leaking to the outside of the cutting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view of the cutting device according to the embodiment.

[0012] Figure 2 It is a front view of the cutting device according to the embodiment.

[0013] Figure 3 This is a cross-sectional view of the cutting device according to the embodiment cut along a plane perpendicular to the X-axis.

[0014] Figure 4 This is a cross-sectional view of the cutting device according to the embodiment cut along a plane perpendicular to the Y axis.

[0015] Figure 5 This is a cross-sectional view of the cutting device according to the embodiment after the cutting operation, cut along a plane perpendicular to the Y axis.

[0016] Figure 6 This is a perspective view of a pusher included in the cutting device according to the embodiment.

[0017] Figure 7 It is a front view of the conductor included in the cutting device according to the embodiment.

[0018] Fig. 8A It is a top view of the conductor included in the cutting device according to the embodiment.

[0019] Figure 8B yes Fig. 8A A stereogram of area E1.

[0020] Fig. 9 This is a cross-sectional view of the cutting device according to the embodiment cut along a plane perpendicular to the Z axis.

[0021] Fig.10 The cutting device of the embodiment is a plane perpendicular to the Z axis and is Fig. 9 A sectional view obtained by cutting a plane at different heights.

[0022] Fig.11 It is a front view of the main part of the cutting device of embodiment.

[0023] Fig.12 It is a rear view of the main part of the cutting device of embodiment.

[0024] Fig.13A It is a plan view of a main part of the conductor included in the cutting device according to the first modification.

[0025] Fig. 13B yes Fig.13A XX line section view.

[0026] Fig.14 It is a plan view of a main part of the conductor included in the cutting device according to the second modification.

[0027] Fig.15 It is a plan view of a main part of the conductor included in the cutting device according to the third modification.

[0028] Fig.16 It is a plan view of a main part of the conductor included in the cutting device according to the fourth modification.

[0029] Fig.17 It is a plan view of a main part of the conductor included in the cutting device according to the fifth modification.

[0030] Fig.18 It is a plan view of a main part of the conductor included in the cutting device according to the sixth modification.

[0031] Fig.19 This is an enlarged cross-sectional view of a main part of a cutting device according to a seventh modification.

[0032] Fig. 20A It is a side view of the pusher included in the cutting device of Modification 8.

[0033] Fig. 20B It is a bottom view of the pusher included in the cutting device of Modification 8. DETAILED DESCRIPTION

[0034] Hereinafter, the cutting device of the embodiment of the present disclosure will be described with reference to the accompanying drawings. However, the following embodiments are only a part of the various embodiments of the present disclosure. The following embodiments can be modified in various ways according to the design, etc. as long as the purpose of the present disclosure can be achieved. In addition, the figures described in the following embodiments are schematic figures, and the size and thickness ratios of the components in the figures may not necessarily reflect the actual size ratios.

[0035] (1) Implementation Method

[0036] Reference Figures 1 to 12 The cutting device 10 of this embodiment will be described.

[0037] The interrupter 10 is a device mounted on an object having a circuit through which current supplied from a power source flows. The interrupter 10 operates when an abnormality occurs in a circuit or system in the object, for example, and interrupts the circuit to prevent damage caused by the abnormality from increasing.

[0038] The disconnection device 10 is mounted on a vehicle as an example of an object. The disconnection device 10 is connected between a motor in the vehicle and a battery (e.g., a lithium-ion battery) for driving the motor, and disconnects the electrical connection between the motor and the battery for driving the motor when an emergency such as an abnormality or a failure occurs. The object may be an object other than a vehicle, for example, a home appliance, a solar power generation system, etc., but is not particularly limited.

[0039] (1.1) Structure of cutting device

[0040] like Figure 1 to Figure 4 As shown, the cutting device 10 includes a housing 1 , an igniter 2 , a conductor 3 , a resin member 4 , a pusher 5 , a protection portion 6 , and elastic members 71 to 74 .

[0041] Hereinafter, the cutting device 10 is described by defining the three axes (X axis, Y axis and Z axis) of the three-dimensional orthogonal coordinate system of the right-hand system as follows. That is, the direction along the axis of the through hole 40 that penetrates the cylindrical resin member 4 is set as the Z axis direction, the direction orthogonal to the Z axis direction and the direction along the extension direction of the plate-shaped conductor 3 is set as the Y axis direction, and the direction orthogonal to the Y axis direction and the Z axis direction is set as the X axis direction. In addition, for the convenience of explanation, the direction along the Z axis is also referred to as the up-down direction, and the side (positive direction of the Z axis) where the igniter 2 is located when viewed from the conductor 3 is also referred to as "up" and the opposite direction is also referred to as "down". In addition, the direction along the Y axis is also referred to as the left-right direction, and the side (positive direction of the Y axis) where the second terminal 32 is located when viewed from the first terminal 31 of the conductor 3 is also referred to as "right" and the opposite direction is also referred to as "left". In addition, the direction along the X axis is also referred to as the front-back direction, and the positive direction of the X axis is also referred to as "front" and the opposite direction is also referred to as "back". However, the definition of the axis and direction in the present disclosure merely indicates the relative positional relationship between the components of the cutting device 10 and does not limit the posture when the cutting device 10 is set on the object.

[0042] The housing 1 constitutes the outer shell of the cutting device 10. Figure 3 , Figure 4 As shown in FIG. 1 , the housing 1 is a hollow cylinder. The housing 1 is formed of metal such as stainless steel (SUS). However, the present invention is not limited thereto, and the housing 1 may also be formed of other metals such as aluminum. Figure 3 As shown, the casing 1 accommodates the igniter 2 (at least the lower end), a part of the conductor 3 (including the connection portion 36 described later), the resin member 4, the pusher 5, the protection portion 6 and the elastic members 71 to 74.

[0043] like Figure 1 to Figure 4 As shown, the housing 1 includes an upper housing 11 and a lower housing 12 .

[0044] The upper housing 11 is a cylinder having an opening 110 at the center of the upper bottom surface and an entire lower bottom surface open, and having a cavity inside. The upper housing 11 has an upper bottom portion 111, a first cylinder portion 112, a first connecting portion 113, a second cylinder portion 114, a second connecting portion 115, and a first connecting portion 116.

[0045] The upper bottom portion 111 is in a disk shape (ring shape) having an opening 110 at the center. The first cylindrical portion 112 is in a cylindrical shape extending downward from the outer peripheral edge of the upper bottom portion 111 .

[0046] The second tube portion 114 is in a cylindrical shape having a diameter larger than that of the first tube portion 112 , and is disposed coaxially with the first tube portion 112 and spaced apart downward from the first tube portion 112 .

[0047] The first coupling portion 116 is cylindrical in shape and has a diameter larger than that of the second cylindrical portion 114, and is disposed coaxially with the second cylindrical portion 114 and spaced apart from the second cylindrical portion 114 in a downward direction. Figure 1 , Figure 2 As shown, the left and right sides of the first connecting portion 116 are provided with a substantially rectangular notch 117 cut from the lower end to the upper end of the first connecting portion 116 when viewed from the side. Therefore, it can also be said that the first connecting portion 116 includes a pair of arc plate-shaped members.

[0048] The first connecting portion 113 is a cylindrical shape with a larger diameter toward the bottom, and vertically connects the first cylindrical portion 112 and the second cylindrical portion 114. The second connecting portion 115 is a cylindrical shape with a larger diameter toward the bottom, and vertically connects the second cylindrical portion 114 and the first connecting portion 116.

[0049] The lower housing 12 is in the shape of a bottomed cylinder with an open bottom surface on the upper side and a cavity inside. The lower housing 12 includes a lower bottom portion 121 , a third cylinder portion 122 , a third connection portion 123 , and a second connection portion 124 .

[0050] The lower bottom 121 is in the shape of a circular tray having a truncated cone-shaped protrusion 120 protruding upward in the center. The protrusion 120 is opposite to the igniter 2 via the conductor 3 (connection portion 36 described later). The protrusion 120 is deformed downward in a manner of being flattened by contact with the conductor 3 and the thruster 5 moving downward by the gas generated by the igniter 2. In other words, the protrusion 120 has a function of absorbing the impact (kinetic energy) from the conductor 3 and the thruster 5 by deformation. The lower bottom 121 may not necessarily have the protrusion 120.

[0051] The third tube portion 122 is cylindrical and extends upward from the outer peripheral edge of the lower bottom portion 121 .

[0052] The second coupling portion 124 is cylindrical in shape with a diameter larger than that of the third barrel portion 122, and is coaxial with the third barrel portion 122 and is arranged to be separated upward from the third barrel portion 122. Notches 125 obtained by cutting from the upper end to the lower end of the second coupling portion 124 are provided on the left and right sides of the second coupling portion 124. Therefore, it can also be said that the second coupling portion 124 includes a pair of arc plate-shaped components.

[0053] The third connection portion 123 is a cylindrical shape whose diameter increases toward the upper side, and connects the third cylindrical portion 122 and the second connecting portion 124 vertically.

[0054] The upper housing 11 and the lower housing 12 are fixed to each other by overlapping the lower end of the first connecting portion 116 of the upper housing 11 and the second connecting portion 124 of the lower housing 12, and the overlapping portions are connected to each other by welding, for example. Welding is performed by laser welding, for example, but is not limited to this, and other welding methods such as TIG (Tungsten InertGas) welding and projection welding may also be used. In addition, the fixing method of the upper housing 11 and the lower housing 12 is not limited to welding, and other methods such as screw fastening may be used.

[0055] The resin member 4 is formed of a resin material such as synthetic resin.

[0056] like Figure 1 to Figure 4 As shown, the resin member 4 has a cylindrical portion 41 and a pair of protruding portions 42 .

[0057] The barrel portion 41 is a hollow cylindrical shape having a predetermined thickness in the radial direction, and is a hollow substantially cylindrical shape in this case. A through hole 40 is formed in the barrel portion 41 and penetrates in the axial direction. Figure 3 , Figure 4 As shown, the resin member 4 (barrel portion 41) has an internal space 400 (space within the through hole 40). The diameter of the through hole 40 is the same as the inner diameter of the first barrel portion 112 of the upper housing 11. In addition, in the present disclosure, two elements "same" may also mean that the two elements are strictly the same, but is not limited to this, for example, it may also mean a substantially equal range, for example, it may also include a difference of about a few percent (or about 10%).

[0058] A first housing groove 43 is formed along the circumferential direction near the upper end of the cylindrical body 41. A second housing groove 44 is formed along the circumferential direction near the lower end of the cylindrical body 41.

[0059] The pair of protrusions 42 protrude from the left and right side surfaces of the cylindrical body 41. The pair of protrusions 42 are each substantially rectangular columnar and have flanges at the protruding ends.

[0060] The resin member 4 is held in the housing 1 in the following manner: the cylindrical body 41 is located inside the housing 1 in a state where the axial direction of the cylindrical body 41 is along the axial direction of the housing 1, and the pair of protrusions 42 protrude from the housing 1 through a pair of openings formed by the notches 117 and 125 of the housing 1. In this way, (the cylindrical body 41 of) the resin member 4 is located inside the housing 1.

[0061] The resin member 4 includes the protrusion 42 so that the edge portions of the notches 117 and 125 of the housing 1 come into contact with the protrusion 42 to ensure the airtightness of the internal space 400 of the resin member 4. However, the protrusion 42 may be omitted.

[0062] The conductor 3 is a conductive metal body. The conductor 3 is connected to the electronic components (battery, motor, etc.) of the object on which the cutting device 10 is mounted, and forms a circuit together with these electronic components. The conductor 3 is formed of a metal such as copper (Cu). However, the conductor 3 may be formed of a metal other than copper, or may be formed of an alloy of copper and other metals. For example, the conductor 3 may also be composed of manganese (Mn), nickel (Ni), platinum (Pt), etc.

[0063] like Figure 1 to Figure 3 As shown, the conductor 3 is in the shape of a plate. The conductor 3 is in the shape of a plate extending in the left-right direction and having a thickness in the up-down direction. The conductor 3 is held in the resin member 4 in a manner that penetrates the resin member 4 in the left-right direction. The conductor 3 penetrates the protrusion 42 on one side, the barrel portion 41, and the protrusion 42 on the other side. For example, the resin member 4 is formed by insert molding using the conductor 3 as an insert, thereby forming the conductor 3 and the resin member 4 as a whole. The conductor 3 is located below the igniter 2.

[0064] like Figure 3 As shown, the conductor 3 includes a first terminal portion 31 , a second terminal portion 32 , and a conductive portion 33 .

[0065] The first terminal portion 31 is a portion of the conductor 3 that protrudes leftward from the left side surface of the protruding portion 42 on the left side of the resin member 4. The first terminal portion 31 protrudes from the housing 1. Here, the first terminal portion 31 protrudes leftward from the left side surface of the housing 1. The first terminal portion 31 can be used as a terminal connected to an electronic component of an object.

[0066] The second terminal portion 32 is a portion that protrudes rightward from the right side surface of the protruding portion 42 on the right side of the resin member 4 in the conductor 3. The second terminal portion 32 protrudes from the housing 1. Here, the second terminal portion 32 protrudes rightward from the right side surface of the housing 1. That is, the second terminal portion 32 protrudes from the housing 1 on the side opposite to the first terminal portion 31 in the left-right direction. The second terminal portion 32 can be used as a terminal connected to an electronic component of an object.

[0067] The conductive portion 33 is a portion of the conductor 3 that connects the first terminal portion 31 and the second terminal portion 32. Figure 3 , Figure 4 As shown, the conductive part 33 is located below the igniter 2. A portion of the conductive part 33 is located in the through hole 40 (in the internal space 400), and the remaining portion of the conductive part 33 is buried in the resin member 4. In other words, the resin member 4 is buried with a portion of the conductor 3. Therefore, the conductor 3 is held in the resin member 4 by the portion of the conductive part 33 in which the resin member 4 is buried. Hereinafter, the portion of the conductive part 33 in which the resin member 4 is buried and connected to the first terminal portion 31 (the left portion of the conductive part 33) is also referred to as the "first holding portion 34". In addition, the portion of the conductive part 33 in which the resin member 4 is buried and connected to the second terminal portion 32 (the right portion of the conductive part 33) is also referred to as the "second holding portion 35". In addition, the portion of the conductive part 33 located in the internal space 400 in the through hole 40 (the central portion of the conductive part 33) is also referred to as the "connecting portion 36". The connecting portion 36 connects the first holding portion 34 and the second holding portion 35.

[0068] like Figure 3 , Figure 7 , Fig. 8A As shown in FIG. 1 , a separation groove 371 is formed on the upper surface of the conductor 3 near the boundary between the first holding portion 34 and the connecting portion 36. In addition, a separation groove 372 is formed on the upper surface of the conductor 3 near the boundary between the second holding portion 35 and the connecting portion 36. Furthermore, a separation groove 373 is formed on the lower surface of the conductor 3 near the boundary between the first holding portion 34 and the connecting portion 36 (at the back side of the separation groove 371). A separation groove 374 is formed on the lower surface of the conductor 3 near the boundary between the second holding portion 35 and the connecting portion 36 (at the back side of the separation groove 372). The separation grooves 371 to 374 each have a shape corresponding to the outer peripheral shape of the pusher 5. In addition, the separation grooves 371 to 374 each have a shape formed in accordance with the inner periphery of the through hole 40 of the resin member 4. Here, the separation grooves 371 to 374 each have an arc shape.

[0069] Ignitor 2 is an electronic ignitor. Figure 3 , Figure 4 As shown, the igniter 2 includes a housing 20, two energizing needles 21, gunpowder 24, and a heating element 25. The gunpowder 24 is stored in a storage space 200 of the housing 20, and the two energizing needles 21 are connected in the storage space 200 via the heating element 25. The housing 20 has a cover 22 at the lower side to close the storage space 200.

[0070] like Figure 3 , Figure 4As shown, igniter 2 is held in housing 1 by being inserted into housing 1 through opening 110 of upper housing 11 of housing 1 , with cover 22 facing downward and part (lower end) of igniter 2 housed in recess 51 of pusher 5 .

[0071] A connector socket 29 is arranged at the upper part of the igniter 2. A connector having two connection terminals connected to two energizing pins 21 is connected to the connector socket 29. For example, a working current is supplied to the two connection terminals of the connector from a control unit of an object on which the cutting device 10 is mounted (for example, an ECU of a vehicle: Electronic Control Unit). If a working current is supplied to the heating element 25 via the two energizing pins 21, the gunpowder 24 ignites and burns to generate gas. The generated gas increases the pressure inside the storage space 200. If the pressure inside the storage space 200 exceeds the withstand pressure of the cover 22, the cover 22 is opened (destroyed), and the gas is released to the outside of the igniter 2 at a higher pressure. In this way, the igniter 2 generates gas. A structure such as a cross groove, which serves as a starting point for opening the cover 22, may also be provided on the cover 22. In addition, the component that supplies the working current to the energizing pin 21 is not limited to the control unit of the object. For example, a mechanism that automatically flows a working current when an abnormality occurs in the object (for example, a mechanism that supplies an induced current generated in a coil that moves relative to a magnet due to an impact on the vehicle body as a working current) may supply working current to the energizing pin 21.

[0072] like Figure 1 to Figure 4 As shown, the housing 1 further includes a cover 13. The cover 13 is a tapered cylinder having a flange at the lower end and an open upper surface. The cover 13 covers the igniter 2 from the upper side so that the current-carrying needle 21 is exposed. The cover 13 is fixed to the upper housing 11 by, for example, fixing the flange to the upper surface of the upper bottom 111 of the upper housing 11 by welding or the like.

[0073] The pusher 5 is formed of an insulating member such as synthetic resin. The pusher 5 is formed of nylon, for example. Figure 3 , Figure 4 , Figure 6 As shown, the pusher 5 is a columnar member, in this case a cylindrical member. The outer diameter of the pusher 5 corresponds to the inner diameter of the first cylinder portion 112 of the upper housing 11 and the inner diameter of the through hole 40 of the resin member 4, and is slightly smaller than the above diameters.

[0074] like Figure 3 , Figure 4As shown in the figure, a recess 51 for arranging the igniter 2 is formed on the upper surface of the pusher 5. The recess 51 is recessed downward from the upper surface of the pusher 5. The recess 51 has: a first portion 511 whose diameter gradually decreases as it goes downward; and a second portion 512 whose diameter is substantially constant, connected to the first portion 511 and located below the first portion 511. A space (pressurized space) 510 pressurized by the gas generated by the igniter 2 is formed in the recess 51 of the pusher 5.

[0075] like Figure 3 , Figure 4 , Figure 6 As shown in the figure, a plurality of (seven in this case) upwardly recessed recesses 52 are formed on the lower surface of the pusher 5. One recess 521 of the seven recesses 52 is formed at the center of the lower surface of the pusher 5. The remaining six recesses 522 are formed at approximately equal angles in the circumferential direction at positions approximately in the middle between the center of the lower surface and the outer peripheral edge in the radial direction of the lower surface of the pusher 5. In addition, an annular support protrusion 53 is formed on the lower surface of the pusher 5 along its outer peripheral edge, which protrudes downward from the central portion.

[0076] like Figure 3 , Figure 4 As shown, the pusher 5 is arranged in a space surrounded by the upper bottom 111 and the first cylindrical portion 112 of the housing 1, the inner surface of the through hole 40 of the resin member 4, and the conductive portion 33 of the conductor 3 (the first position of the pusher 5) in a state where the supporting protrusion 53 is placed on the conductive portion 33. That is, the pusher 5 is arranged at the first position which is a position between the igniter 2 and the conductive portion 3 before the rupture (the first retaining portion 34, the second retaining portion 35). The pusher 5 is placed on the upper surface of the conductive portion 33, for example, in the following manner: two of the six recesses 522 overlap with the conductive portion 3 in the vertical direction, and the remaining four recesses 522 do not overlap with the conductive portion 3 in the vertical direction.

[0077] The pusher 5 moves downward from the first position toward the second position by the gas generated by the igniter 2. The second position is a position of the pusher 5 where the lower end of the pusher 5 is located below the lower end of the conductor 3 (the first holding portion 34, the second holding portion 35), and is, for example, Figure 5 The pusher 5 is shown in the position of the pusher 5. When the pusher 5 moves from the first position to the second position, it presses the conductive portion 33 downward from above, thereby separating the connecting portion 36 of the conductive portion 33 from the first holding portion 34 and the second holding portion 35.

[0078] In summary, the cutting device 10 includes the pusher 5. The pusher 5 is disposed at the first position between the conductor 3 and the igniter 2. The pusher 5 uses the gas generated by the igniter 2 to break a portion (connecting portion 36) of the conductor 3 from the first position and moves toward the second position located below the first position. When the pusher 5 is located at the second position (see Figure 5 ), the storage space 200 of the igniter 2 is connected to the internal space 400 of the resin member 4, so the gas generated by the igniter 2 also fills the internal space 400 of the resin member 4. In addition, a part of the gas generated by the igniter 2 also passes through the gap between the inner surface of the through hole 40 of the resin member 4 and the outer surface of the propulsion member 5 and fills the space on the lower side of the casing 1 (the space where the connecting portion 36 is located).

[0079] The protection part 6 is a member for preventing the pusher 5 from being damaged by the cover part 22 of the igniter 2 when the igniter 2 generates gas. The protection part 6 is formed of metal such as stainless steel (SUS), but may be formed of other metals such as aluminum or resin.

[0080] The protection portion 6 includes a first tube portion 61 , a second tube portion 62 , and a flange portion 63 .

[0081] The first tube portion 61 is a cylindrical portion surrounding the side of the igniter 2, and has a shape formed in accordance with the outer shape of the housing 20 of the igniter 2. For example, the first tube portion 61 is formed in a stepped shape (for example, a two-stage stepped shape) with a diameter gradually decreasing downward in a cross-sectional view. In addition, the shape of the first tube portion 61 is not limited thereto, and for example, the first tube portion 61 may also be a tapered shape with a diameter decreasing downward, or may be other shapes.

[0082] The second tube portion 62 is located below the first tube portion 61 and is in a cylindrical shape with a diameter smaller than that of the first tube portion 61. The second tube portion 62 protrudes downward from the lower end of the first tube portion 61. The second tube portion 62 protrudes downward so that the lower end of the second tube portion 62 is located below the cover portion 22 of the igniter 2. When the igniter 2 generates gas, the part of the cover portion 22 that is opened (see Figure 5 ) can contact the second cylinder portion 62. By having the second cylinder portion 62, it is possible to suppress the cover portion 22 from colliding with the pusher 5.

[0083] The flange portion 63 is annular and protrudes outward from the upper end of the first tube portion 61 in a plan view. The flange portion 63 is fixed to the lower surface of the upper bottom portion 111 of the upper housing 11 by welding or the like. In this way, the protection portion 6 is fixed to the housing 1. Alternatively, the flange portion 63 may be fixed to the upper bottom portion 111 without a gap in the circumferential direction.

[0084] In addition, in the present disclosure, “looking down” may be expressed as “viewing from above”, and it means the same thing.

[0085] The elastic members 71 to 74 are members for improving the airtightness of the internal space of the housing 1. The elastic members 71 to 74 suppress leakage of the gas generated by the igniter 2 from the internal space of the housing 1 to the external space.

[0086] The elastic members 71 to 74 are elastic members such as rubber, and are O-rings formed in an annular shape in this case. The elastic members 71 to 74 are arranged in a pressed state (deformed state).

[0087] Elastic member 71 is disposed in a space formed between the upper surface of upper bottom 111 of upper housing 11, cover 13, and the side surface of the housing of igniter 2. Elastic member 71 contacts and presses upper bottom 111, cover 13, and igniter 2, respectively.

[0088] The elastic member 72 is disposed in a space formed between the inner surface of the first connection portion 113 of the upper housing 11, the upper surface of the cylindrical portion 41 of the resin member 4, and the outer surface of the pusher 5. The elastic member 72 is pressed against the first connection portion 113, the resin member 4, and the pusher 5. The elastic member 72 is in a state where the pusher 5 is located at the first position (see Figure 3 , Figure 4 ) to separate the space 510 in the recess 51 from the space where the conductor 3 is located.

[0089] The elastic member 73 is disposed in a space formed between the inner surface of the second tube portion 114 of the upper housing 11 and the inner surface of the first receiving groove 43 of the barrel portion 41 of the resin member 4. The elastic member 73 is pressed by contacting at least the bottom surface of the first receiving groove 43 and the second tube portion 114.

[0090] The elastic member 74 is disposed in a space formed between the inner surface of the third tube portion 122 of the lower housing 12 and the inner surface of the second receiving groove 44 of the cylindrical body 41 of the resin member 4. The elastic member 74 contacts at least the bottom surface of the second receiving groove 44 and the third tube portion 122 and is pressed.

[0091] (1.2) Operation of the cutting device

[0092] Reference Figure 3 to Figure 5 The operation of the cutting device 10 will be described.

[0093] (1.2.1) Normal action

[0094] First, the operation (normal operation) of the cutting device 10 when the igniter 2 is not driven will be described. In the normal operation, the pusher 5 is located at the first position ( Figure 3 , Figure 4 shown).

[0095] As described above, the cut-off device 10 is mounted on an object such as a vehicle. For example, the terminal on the positive side of the battery is connected to the first terminal portion 31 of the conductor 3 via an electronic component as needed. In addition, the terminal on the negative side of the battery is connected to the second terminal portion 32 of the conductor 3 via an electronic component as needed. Thus, the conductor 3 of the cut-off device 10 forms a circuit through which the current supplied from the battery passes, thereby forming a circuit in the object. If the switch included in the electronic component is turned on, the current from the battery is supplied to the circuit including the conductor 3.

[0096] (1.2.2) Cutting action

[0097] Next, the operation (cut-off operation) of the cut-off device 10 when the igniter 2 is driven will be described.

[0098] For example, if an abnormality occurs in the object equipped with the cutting device 10 such as a vehicle failure, a control unit that controls the operation of the object (such as the vehicle's ECU) supplies an operating current to the heating element 25 via the connection terminal of the connector and the energizing pin 21 of the igniter 2.

[0099] If the operating current is supplied to the heating element 25, the temperature of the heating element 25 rises, and the temperature of the gunpowder 24 around the heating element 25 rises. For example, if the temperature of the gunpowder 24 reaches the ignition point, the gunpowder 24 ignites and burns to generate gas, which increases the pressure in the storage space 200 of the igniter 2. If the pressure in the storage space 200 exceeds the pressure resistance of the cover 22, the cover 22 is opened (destroyed), and the gas in the storage space 200 is released to the space (pressurized space) 510 in the recess 51 of the thruster 5 at a higher pressure.

[0100] The pusher 5 at the first position (see Figure 3 , Figure 4 ) is pressed downward by the pressure of the gas in the pressurized space 510, and the connecting portion 36 of the conductor 3 is pressed downward. The connecting portion 36 of the conductor 3 is pressed by the pusher 5 and is separated from the first holding portion 34 and the second holding portion 35 along the separation grooves 371 to 374, and moves downward together with the pusher 5. By separating the connecting portion 36 from the first holding portion 34 and the second holding portion 35, the circuit is cut off in the cutting device 10. In this way, the circuit of the object can be cut off.

[0101] In this way, the interruption device 10 is actuated when an abnormality occurs in the object to interrupt the circuit of the object, thereby preventing the damage caused by the abnormality from increasing.

[0102] In addition, the pusher 5 and the connecting portion 36 moving downward collide with the protrusion 120 of the lower housing 12 (see Figure 5 ) and causes the protrusion 120 to deform and lose energy and stop moving (the second position of the pusher 5).

[0103] (1.3) Details of the conductor

[0104] Next, refer to Figure 3 , Figure 4 , Figure 7 to Figure 9 The details of the conductor 3 of the cutting device 10 according to the present embodiment will be described in more detail.

[0105] As described above, the conductor 3 is a flat plate-shaped member, and includes the first terminal portion 31 , the second terminal portion 32 , and the conductive portion 33 .

[0106] The first terminal portion 31 is a portion protruding to the left from the housing 1 (resin member 4) in the conductor 3. The first terminal portion 31 is plate-shaped and has a through hole 311 extending through the first terminal portion 31 in the thickness direction (vertical direction). The through hole 311 can be used to connect the first terminal portion 31 to an external electric wire or the like.

[0107] The second terminal portion 32 is a portion of the conductor 3 that protrudes rightward from the housing 1 (resin member 4). The second terminal portion 32 is plate-shaped and has a through hole 321 that penetrates in the thickness direction (vertical direction). The through hole 321 can be used to connect the second terminal portion 32 to an external wire or the like.

[0108] The conductive portion 33 is a plate-shaped member extending in the left-right direction. The conductive portion 33 connects the first terminal portion 31 and the second terminal portion 32. As described above, the conductive portion 33 includes the first holding portion 34, the second holding portion 35, and the connecting portion 36.

[0109] (1.3.1) First holding unit

[0110] The first holding portion 34 is a portion of the conductive portion 33 that is buried in the resin member 4 and connects the first terminal portion 31 and the connecting portion 36 .

[0111] like Fig. 8A , Fig. 9 As shown, the first holding portion 34 includes a first portion 341 , a second portion 342 , and a connecting portion 343 .

[0112] The first portion 341 is a portion connected to the first terminal portion 31 in the first retaining portion 34. The boundary between the first portion 341 and the first terminal portion 31 (i.e., the boundary between the first retaining portion 34 and the first terminal portion 31) is a boundary between a portion embedded in the resin member 4 and a portion protruding from the outer side surface of the resin member 4 in the conductor 3. For example, the dimension (length L10) of the first portion 341 in the front-to-back direction is constant in a portion other than a portion provided with a recessed portion 345 described later. For example, in the front-to-back direction, the dimension (length L10) of the first portion 341 is the same as the dimension (length) of the first terminal portion 31.

[0113] The second portion 342 is a portion connected to the connecting portion 36 in the first retaining portion 34. The boundary between the second portion 342 and the connecting portion 36 (i.e., the boundary between the first retaining portion 34 and the connecting portion 36) is a boundary between a portion embedded in the resin member 4 and a portion protruding from the inner side surface of the resin member 4 in the conductor 3. For example, the dimension (length L12) of the second portion 342 in the front-to-back direction is constant. In the front-to-back direction, the dimension (length L12) of the second portion 342 is smaller than the dimension (length L10) of the first portion 341. For example, in the front-to-back direction, the dimension (length L12) of the second portion 342 is the same as the dimension (length) of the connecting portion 36. In addition, as Figure 7 As shown, in the up-down direction, the size (thickness) of the second portion 342 is smaller than the size (thickness) of the first portion 341 .

[0114] The connecting portion 343 is a portion that connects the first portion 341 and the second portion 342 in the first holding portion 34. Fig. 8A , Fig. 9 As shown, the front and rear side surfaces of the connecting portion 343 are inclined in a manner that the dimension of the connecting portion 343 in the front and rear direction gradually decreases from the first portion 341 side toward the second portion 342 side. Figure 7 As shown, at least one of the upper surface and the lower surface of the connecting portion 343 (here, the lower surface) is inclined so that the dimension (thickness) of the connecting portion 343 in the vertical direction gradually decreases from the first portion 341 side toward the second portion 342 side.

[0115] like Fig. 8A , Fig. 9As shown, the first retaining portion 34 has a through hole 344 that passes through the first retaining portion 34 in the up-down direction. The through hole 344 is formed in the first portion 341. The through hole 344 is in the shape of a long hole that is longer in the front-to-back direction. The through hole 344 is formed in the center of the first portion 341 in the front-to-back direction. In the front-to-back direction, the size of the through hole 344 (length L11) is smaller than the size of the first portion 341 (length L10), and is larger than the size of the second portion 342 (length L12). The front end of the through hole 344 is located forward of the front side of the second portion 342, and the rear end of the through hole 344 is located rearward of the rear side of the second portion 342. In other words, the through hole 344 has a shape that overlaps the entirety of the second portion 342 when viewed from the left. As shown in FIG. Fig. 9 As shown, the through hole 344 is buried in the resin member 4 .

[0116] like Fig. 8A , Fig. 9 As shown, the first holding portion 34 has a recess 345. The recess 345 is formed on the side surface of the first holding portion 34. The recess 345 is formed on the side surface of the first portion 341. The recess 345 is formed on at least one of the front side surface and the rear side surface, and is formed on both the front side surface and the rear side surface.

[0117] The recess 345 is provided, for example, at a position overlapping the through hole 344 in the left-right direction. The recess 345 is, for example, a recess that is concave in an arc shape when viewed from the front toward the rear or from the rear toward the front. Fig. 9 As shown, the recessed portion 345 is buried in the resin member 4 .

[0118] like Figure 7 , Fig. 8A , Fig. 9 As shown, the first holding portion 34 has a first recess 346 connected to the through hole 344. The first recess 346 is provided on at least one of the upper surface and the lower surface of the first holding portion 34, and is provided on both the upper surface and the lower surface. The first recess 346 is a groove-shaped portion, which extends in the front-to-back direction and is provided from the through hole 344 to the front side surface or the rear side surface (here, the recess 345) of the first holding portion 34. Fig. 9 As shown, the first recess 346 is embedded in the resin member 4. Fig. 9 It is a cross-sectional view when the cutting device 10 is cut halfway in the depth direction of the first recess 346 .

[0119] like Figure 7 , Fig. 8A , Fig. 9As shown, the first retaining portion 34 has a second recess 347. The second recess 347 is located between the first recess 346 and the first terminal portion 31 in the left-right direction. In other words, the first recess 346 and the through hole 344 are located between the second recess 347 and the connecting portion 36. The second recess 347 is provided on at least one of the upper surface and the lower surface of the first retaining portion 34, and is provided on both the upper surface and the lower surface here. The second recess 347 is groove-shaped here, extending in the front-to-back direction, and is provided on the entire length of the first retaining portion 34 in the front-to-back direction. The depth of the second recess 347 (the dimension in the up-down direction) is the same as the depth of the first recess 346 here, but may also be different. As shown in FIG. Fig. 9 As shown, the second recess 347 is buried in the resin member 4 .

[0120] like Fig. 8A As shown in FIG. 1 , a plurality of grooves 38 are formed on at least one of the upper surface and the lower surface of the first holding portion 34. In other words, the first holding portion 34 has a plurality of grooves 38 provided on at least one of the upper surface and the lower surface. Here, the plurality of grooves 38 are formed on the upper surface of the first holding portion 34 (see FIG. 1 ). Fig. 8A ) and the lower surface. The plurality of grooves 38 are formed, for example, by knurling.

[0121] like Fig. 8A As shown, the plurality of grooves 38 are provided on the upper surface of the first holding portion 34 between the second recess 347 of the first portion 341 and the connecting portion 343, and on the upper surface of the connecting portion 343. In addition, the plurality of grooves 38 are provided on the lower surface of the first holding portion 34 between the second recess 347 of the first portion 341 and the connecting portion 343, and on the lower surface of the connecting portion 343. The grooves 38 are not provided on the first recess 346 and the second recess 347, but this is a matter of ease of processing, and the grooves 38 may be provided on at least one of the first recess 346 and the second recess 347, for example, both. In addition, the grooves 38 are not provided on the upper surface and the lower surface of the second portion 342, but this is a matter of ease of processing, and the grooves 38 may be provided on at least one of the upper surface and the lower surface of the second portion 342, for example, both.

[0122] The plurality of grooves 38 are formed in the entire first holding portion 34 in the front-rear direction. The plurality of grooves 38 are embedded in the resin member 4.

[0123] like Fig. 8A , Figure 8B As shown, the plurality of grooves 38 include a plurality of first grooves 381 and a plurality of second grooves 382 .

[0124] The first groove 381 extends in the front-to-back direction when viewed from above (in a planar perspective). In other words, the first groove 381 extends in a direction (front-to-back direction) that is orthogonal to the direction (left-right direction) in which the conductor 3 extends when viewed from above (in a planar perspective). The plurality of first grooves 381 are parallel to each other. In addition, in the present disclosure, two elements "orthogonal" or "parallel" may also refer to two elements being strictly "orthogonal" or "parallel", but is not limited to this, and may refer to being substantially orthogonal or parallel, for example, and may include a difference of about a few percent (or about 10%).

[0125] The second groove 382 is oblique to the extension direction of the first groove 381 when viewed from above. In other words, the second groove 382 extends in a direction oblique to the extension direction (left-right direction) of the conductor 3. The plurality of second grooves 382 are parallel to each other. The intersection angle of the extension direction of the second groove 382 with respect to the extension direction of the first groove 381 is not particularly limited as long as it is greater than 0 degrees. In the present embodiment, the intersection angle is, for example, about 40 to 50 degrees.

[0126] like Figure 8B As shown, each of the plurality of grooves 38 has a V-shaped cross section. In other words, each of the plurality of grooves 38 has a V-shaped cross section. "The cross section of the groove 38" refers to the outer shape (cross-sectional shape) of the groove 38 in an imaginary plane perpendicular to the extending direction of the groove 38. The cross section of the first groove 381 is V-shaped, and the cross section of the second groove 382 is V-shaped. Figure 8B As shown, the upper surface and the lower surface of the first holding portion 34 have a plurality of quadrangular pyramid-shaped protrusions 383 by providing a plurality of first grooves 381 and a plurality of second grooves 382 in a V-shaped pattern that intersect each other.

[0127] (1.3.2) Second holding unit

[0128] The second holding portion 35 is a portion embedded in the resin member 4 in the conductive portion 33 and connecting the second terminal portion 32 and the connecting portion 36. In the present embodiment, the second holding portion 35 has a structure that is mirror-symmetrical and two-fold rotationally symmetrical with the first holding portion 34. In the second holding portion 35, for the same structure as the first holding portion 34, detailed description is omitted.

[0129] like Fig. 8A , Fig. 9 As shown, the second holding portion 35 includes a first portion 351 , a second portion 352 , and a connecting portion 353 .

[0130] The first portion 351 is a portion connected to the second terminal portion 32 in the second holding portion 35. The boundary between the first portion 351 and the second terminal portion 32 (i.e., the boundary between the second holding portion 35 and the second terminal portion 32) is a boundary between a portion embedded in the resin member 4 and a portion protruding from the outer side surface of the resin member 4 in the conductor 3.

[0131] The second portion 352 is a portion connected to the connecting portion 36 in the second holding portion 35. The boundary between the second portion 352 and the connecting portion 36 (i.e., the boundary between the second holding portion 35 and the connecting portion 36) is a boundary between a portion embedded in the resin member 4 and a portion protruding from the inner side surface of the resin member 4 in the conductor 3.

[0132] The connection portion 353 is a portion that connects the first portion 351 and the second portion 352 in the second holding portion 35 .

[0133] like Figure 7 , Fig. 8A , Fig. 9 As shown, the second holding portion 35 has a through hole 354, a recess 355, a first recess 356, a second recess 357, and a plurality of grooves 39 (including a first groove 391 and a second groove 392). The through hole 354, the recess 355, the first recess 356, the second recess 357, and the plurality of grooves 39 of the second holding portion 35 have the same structure as the through hole 344, the recess 345, the first recess 346, the second recess 347, and the plurality of grooves 38 of the first holding portion 34. In addition, the second groove 392 of the plurality of grooves 39 may not be the same as the first groove 391. Fig. 8A As shown, it is mirror-symmetrical with the second groove 382 of the groove 38.

[0134] By making the second holding portion 35 mirror-symmetrical or two-fold rotationally symmetrical with the first holding portion 34, symmetry can be imparted to the current-carrying performance of the conductor 3. For example, current can flow from the first terminal portion 31 through the conductive portion 33 to the second terminal portion 32, or in the reverse direction.

[0135] (1.3.3) Connection

[0136] The connection portion 36 is a portion located in the internal space 400 in the through hole 40 of the resin member 4 in the conductive portion 33. The connection portion 36 is a plate-shaped portion extending in the left-right direction and having a thickness in the up-down direction. Figure 3 , Figure 7 As shown, the connection portion 36 has inclined surfaces 361 near both ends in the left-right direction of the lower surface, whereby the thickness of the left and right end portions is thinner than the thickness of the central portion.

[0137] The connecting portion 36 has a through hole 362 at its center. Figure 3 , Figure 4 As shown, the through hole 362 is connected to the central recess 521 among the seven recesses 52 on the lower surface of the pusher 5. By having the through hole 362 and the recesses 52 (521, 522), the pusher 5 that attempts to move downward after the connection portion 36 is cut can be decelerated by air resistance during the cutting action.

[0138] In addition, if Fig. 8A As shown, near the center of the connection portion 36, a bulging portion 363 is provided on both the front and rear side surfaces so as to bulge outward corresponding to the through hole 362. By providing the bulging portion 363, the cross-sectional area of ​​the connection portion 36 in the plane orthogonal to the left-right direction (i.e., the direction in which the current flows in the conductor 3) can be made substantially constant between the portion having the through hole 362 and the portion without the through hole 362, and the current-carrying performance of the conductor 3 can be maintained despite the provision of the through hole 362.

[0139] On the upper surface of the connecting portion 36, near the boundary with the first holding portion 34, along a boundary line B1 (see Fig.10 ) and the above-mentioned separation groove 371 is formed (refer to Figure 7 , Fig. 8A In the present disclosure, “the boundary line B1 between the connection portion 36 and the first holding portion 34 when viewed from above” refers to a line (here, an arc-shaped line) between the portion of the conductor 3 where the resin member 4 is embedded and the portion protruding from the resin member 4 on the upper surface of the conductor 3. In addition, on the upper surface of the connection portion 36, near the boundary with the second holding portion 35, along the boundary line B2 between the connection portion 36 and the second holding portion 35 when viewed from above (refer to Fig.10 ) and the above-mentioned separation groove 372 is formed (refer to Figure 7 , Fig. 8A The above-mentioned separation groove 373 is formed on the lower surface of the connecting portion 36 near the boundary with the first holding portion 34 along the boundary line between the connecting portion 36 and the first holding portion 34 when viewed from above (see Figure 7 The above-mentioned separation groove 374 is formed on the lower surface of the connecting portion 36 near the boundary with the second holding portion 35 along the boundary line between the connecting portion 36 and the second holding portion 35 when viewed from above (see Figure 7 ).like Figure 7 As shown, the separation grooves 371 to 374 are provided at both end portions of the connection portion 36 where the thickness is relatively thin.

[0140] The dimension in the front-to-back direction of the portion of the connecting portion 36 near the boundary with the first holding portion 34 is smaller than the dimension in the front-to-back direction of the first holding portion 34. In other words, the length of the first holding portion 34 is longer than the length L13 between the first end P11 and the second end P12 of the boundary line B1 between the connecting portion 36 and the first holding portion 34 (see Fig. 9) length. Here, “the length of the first retaining portion 34” refers to the maximum dimension of the first retaining portion 34 in the front-to-back direction, which is the length L10 of the first portion 341. In addition, “the first end P11 and the second end P12 of the boundary line B1 between the connecting portion 36 and the first retaining portion 34” respectively refer to one end and the other end of the arc-shaped boundary line B1 between the connecting portion 36 and the first retaining portion 34. “The length L13 between the first end P11 and the second end P12 of the boundary line B1 between the connecting portion 36 and the first retaining portion 34” refers to the straight-line distance (shortest distance) between the first end P11 and the second end P12.

[0141] In addition, the dimension in the front-to-back direction of the portion of the connection portion 36 near the boundary with the first holding portion 34 is larger than the dimension (length L11) in the front-to-back direction of the through hole 344 of the first holding portion 34 (see Fig. 8A In particular, the length L11 of the through hole 344 of the first holding portion 34 is equal to the length L13 between the first end P11 and the second end P12 of the boundary line B1 between the connecting portion 36 and the first holding portion 34 (see Fig. 9 ) is the same as or longer than the length L13. Here, the "length L11 of the through hole 344 of the first holding portion 34" refers to the maximum dimension of the through hole 344 in the front-to-back direction.

[0142] Similarly, the length L20 of the second holding portion 35 is longer than the length L23 between the first end P21 and the second end P22 of the boundary line B1 between the connecting portion 36 and the second holding portion 35. In addition, the length L21 of the through hole 354 is the same as or longer than the length L23 between the first end P21 and the second end P22 of the boundary line B2 between the connecting portion 36 and the second holding portion 35.

[0143] (1.3.4) Arc shielding structure

[0144] There is a case where the cutting action of the cutting device 10 is performed in a state where current flows through the conductor 3. If the connecting portion 36 is cut off from the first holding portion 34 and the second holding portion 35 by the cutting action in a state where current flows through the conductor 3, there is a case where an arc (Arc) is generated between the cut parts. Here, since the resin member 4 and the conductor 3 are formed integrally, there is no gap between the resin member 4 and the conductor 3, and therefore, the generated arc is basically retained in the internal space 400 of the resin member 4. However, in a case where the capacity of the generated arc is very large, there is a possibility that the gas based on the conductivity of the arc passes through the resin member 4 and the conductor 3 (the first holding portion 34 or the second holding portion 35) (intersection) and leaks to the outside of the housing 1. Therefore, the cutting device 10 of the present embodiment has an arc shielding structure that suppresses the leakage of the gas based on the conductivity of the arc to the outside of the housing 1.

[0145] The arc shielding structure includes through holes 344, 354 formed in the first holding portion 34 and the second holding portion 35 of the conductor 3. In other words, the through holes 344, 354 formed in the first holding portion 34 and the second holding portion 35 in which the resin member 4 is embedded in the conductor 3 function as an arc shielding structure.

[0146] The conductive gas (plasma, etc.) generated by the arc at the broken portion between the connecting portion 36 and the first holding portion 34 (or the second holding portion 35) moves to the left (or right) through the boundary between the upper surface or the lower surface of the first holding portion 34 (or the second holding portion 35) and the resin member 4, and attempts to escape to the outside of the housing 1. However, by burying the through hole 344 (or the through hole 354) in the resin member 4, the conductive gas hits the wall of the resin member 4 buried in the through hole 344 (or the through hole 354) during its movement, thereby preventing the movement to the left (or right). As a result, the conductive gas can be prevented from leaking to the outside of the housing 1. In addition, a part of the gas (plasma, etc.) attempts to bypass the through hole 344 (or through hole 354) of the resin member 4 and move further to the left (or right), but the moving path becomes longer due to the bypass, so the gas is cooled during the bypass and the conductivity of the gas (plasma, etc.) is lost. Therefore, even if the gas leaks to the outside of the housing 1, the leaked gas loses its conductivity, so the impact on the outside can be suppressed to a small extent.

[0147] The arc shielding structure includes the first recesses 346 and 356 formed in the first holding portion 34 and the second holding portion 35 of the conductor 3. In other words, the first recesses 346 and 356 formed in the first holding portion 34 and the second holding portion 35 in which the resin member 4 is embedded in the conductor 3 function as the arc shielding structure.

[0148] By providing the first recesses 346 and 356 , the movement of the conductive gas can be blocked or detoured, similarly to the through holes 344 and 354 . This can prevent the conductive gas caused by the arc from leaking to the outside of the housing 1 .

[0149] In addition, since the first recesses 346 and 356 are connected to the through holes 344 and 354, the portion of the resin member 4 in the first recesses 346 and 356 is connected to the portion of the resin member 4 in the through holes 344 and 354. That is, by having the first recesses 346 and 356, the strength of the resin member 4 in the through holes 344 and 354 can also be improved.

[0150] In addition, preferably, the first recess 346 (or the first recess 356) is connected from the through hole 344 (or the through hole 354) to the front side or rear side of the first retaining portion 34 (or the second retaining portion 35), but it may not necessarily be connected to the front side or rear side.

[0151] The arc shielding structure includes the second recesses 347 and 357 formed in the first holding portion 34 and the second holding portion 35 of the conductor 3. In other words, the second recesses 347 and 357 formed in the first holding portion 34 and the second holding portion 35 in which the resin member 4 is embedded in the conductor 3 function as the arc shielding structure.

[0152] By providing the second recesses 347 and 357 , the movement of the conductive gas can be blocked or detoured, similarly to the first recesses 346 and 356 . This can prevent the conductive gas caused by the arc from leaking to the outside of the housing 1 .

[0153] In addition, it is preferred that the second recess 347 (or the second recess 357) is formed over the entire length of the first holding portion 34 (or the second holding portion 35) in the front-to-back direction, but it may be formed only in a portion of the first holding portion 34 (or the second holding portion 35) in the front-to-back direction. In this case, the second recess 347 (or the second recess 357) may be provided at least in a portion that does not overlap with the through hole 344 (or the through hole 354) when viewed from the left or right.

[0154] The arc shielding structure includes the recessed portions 345, 355 formed in the first holding portion 34 and the second holding portion 35 of the conductor 3. In other words, the recessed portions 345, 355 formed in the first holding portion 34 and the second holding portion 35 in which the resin member 4 is embedded in the conductor 3 function as the arc shielding structure.

[0155] The conductive gas (plasma, etc.) generated by the arc at the broken portion between the connecting portion 36 and the first retaining portion 34 (or the second retaining portion 35) attempts to escape to the outside of the housing 1 through the boundary between the front side or rear side of the first retaining portion 34 (or the second retaining portion 35) and the resin member 4. However, by providing the recess 345 (or recess 355) on the front side and rear side of the first retaining portion 34 (or the second retaining portion 35), the movement of the conductive gas can be blocked or detoured, as in the case of the first recess 346, 356, etc. As a result, the gas is not easily leaked to the outside of the housing 1, and the cooling of the gas can be promoted, so that the conductive gas based on the arc can be suppressed from leaking to the outside of the housing 1.

[0156] The arc shielding structure includes a plurality of grooves 38 and 39 formed in the first holding portion 34 and the second holding portion 35 of the conductor 3. In other words, the plurality of grooves 38 and 39 formed in the first holding portion 34 and the second holding portion 35 in which the resin member 4 is embedded in the conductor 3 function as an arc shielding structure.

[0157] By having the grooves 38 and 39, the movement of the conductive gas can be blocked or the moving distance can be lengthened, as in the case of the first recesses 346 and 356. As a result, the gas is less likely to leak to the outside of the housing 1, and the cooling of the gas can be promoted, so that the conductive gas based on the arc can be suppressed from leaking to the outside of the housing 1. In particular, from the viewpoint of ease of processing and extension of the moving path, it is preferable that the grooves 38 and 39 have a V-shaped cross section.

[0158] In addition, by providing a plurality of grooves 38 and 39 in the first holding portion 34 and the second holding portion 35 of the conductor 3, when the resin member 4 and the conductor 3 are integrally formed, the biting of the resin member 4 into the conductor 3 is optimized, and the close fit of the resin member 4 to the conductor 3 can be improved. Therefore, the leakage of the conductive gas based on the arc to the outside of the housing 1 can be further suppressed.

[0159] (1.4) Details of resin components

[0160] Next, refer to Figure 3 , Figure 4 , Figure 10 to Figure 12 The resin member 4 of the cutting device 10 of the present embodiment will be described in detail.

[0161] As described above, the resin member 4 includes the cylindrical portion 41 and the pair of protruding portions 42. The resin member 4 is formed integrally with the conductor 3 by, for example, insert molding.

[0162] like Figure 3 , Figure 4 , Fig.10 As shown, a through hole 40 penetrating in the axial direction is formed in a cylindrical portion 41 of the resin member 4. The inner side surface of the through hole 40 is a cylindrical surface.

[0163] like Fig.11 , Fig.12 As shown, on the outer side surface of the cylindrical body 41, a first housing groove 43 is formed in an annular shape near the upper end, and a second housing groove 44 is formed in an annular shape near the lower end.

[0164] The barrel 41 is so-called lightened. Fig.11 , Fig.12As shown, a first recess group 45 and a second recess group 46 are provided on the outer side surface of the cylindrical body 41. The first recess group 45 and the second recess group 46 are provided on the outer side surface of the cylindrical body 41 in a region where the conductor 3 does not protrude.

[0165] like Fig.11 As shown in FIG. 1 , the resin member 4 has a first recess group 45. The first recess group 45 includes a plurality of first recesses 450. The first recess group 45 is provided in the front region of the outer side surface of the barrel portion 41. Fig.12 As shown, the resin member 4 has a second recess group 46. The second recess group 46 includes a plurality of second recesses 460. The second recess group 46 is provided in a rear region of the outer side surface of the cylindrical body 41.

[0166] (1.4.1) 1st recessed portion group

[0167] As described above, the first recessed portion group 45 is provided in the front region on the outer surface of the cylindrical portion 41 .

[0168] The first recess group 45 includes m×n first recesses 450 as a plurality of first recesses 450. Here, "m" is a natural number greater than or equal to 2, and "n" is a natural number greater than or equal to 1. The m×n first recesses 450 of the first recess group 45 are arranged in a matrix of m rows and n columns in a front view. "m" represents the number of rows of the first recesses 450 arranged in the vertical direction, and "n" represents the number of columns of the first recesses 450 arranged in the left-right direction. That is, the first recess group 45 includes a plurality of (m×n) first recesses 450 arranged in two or more rows in the vertical direction and in one or more columns in the left-right direction.

[0169] like Fig.10 As shown, the plurality of first recesses 450 are recesses that do not penetrate the resin member 4. The depth of each of the plurality of first recesses 450 is set to the dimension between the bottom surface of the first recess 450 and the inner surface of the through hole 40 ( Fig.10 The thickness L100 shown in the figure is greater than the predetermined thickness. The above-mentioned "predetermined thickness" may be a minimum dimension required for the resin member 4 to have a strength that does not cause damage to the resin member 4 even if an abnormality such as a malfunction occurs in the object on which the cutting device 10 is mounted, or the cutting device 10 performs a cutting operation. The bottom surface of each of the plurality of first recesses 450 is curved in a cylindrical shape in a manner that follows the inner bottom surface of the through hole 40.

[0170] The plurality of first recesses 450 are formed so as to be recessed rearward along the X-axis from the outer side surface of the resin member 4. Therefore, the dimension (thickness L101) of the wall portion between the first recesses 450 adjacent in the left-right direction in the resin member 4 is Fig.10 ) is substantially constant in the front-rear direction. Thus, the strength of the wall portion can be improved.

[0171] The plurality of first recesses 450 are formed so that the lateral widths of the first recesses 450 belonging to the same row (for example, the lateral widths of the two first recesses 450 in the leftmost row) are the same. In the present embodiment, the "lateral width of the first recess 450" refers to the length of an imaginary line connecting the left and right ends of the opening surface of the first recess 450 in accordance with the curved shape of the outer side surface of the barrel 41. The "opening surface of the first recess 450" refers to an imaginary surface connecting the left and right opening end edges of the first recess 450 in accordance with the curved shape of the outer side surface of the barrel 41.

[0172] The plurality of first recesses 450 are formed such that, among the first recesses 450 belonging to the same row, the first recesses 450 closer to the lower side have a larger longitudinal width. In the present embodiment, the “longitudinal width of the first recess 450” refers to the length of an imaginary line connecting the upper end and the lower end of the opening surface of the first recess 450.

[0173] like Fig.11 As shown, a plurality of first recesses 450 are formed at positions offset from the conductor 3 in the vertical direction. In the present disclosure, “the first recesses 450 are formed at positions offset from the conductor 3 in the vertical direction” means that the conductor 3 may not overlap with the first recesses 450 as a whole when viewed from the front (i.e., when viewed from a direction perpendicular to the vertical direction), or at least a portion of the conductor 3 (e.g., more than half of the portion in the vertical direction) may not overlap with the first recesses 450. In the present embodiment, more than half of the lower side of the conductor 3 does not overlap with any of the first recesses 450 when viewed from the front.

[0174] like Fig.11 As shown, the m×n first recesses 450 include a first predetermined recess R1, a second predetermined recess R2, and a third predetermined recess R3. The first predetermined recess R1 is a first recess 450 adjacent to the first terminal portion 31 of the conductor 3 among the m×n first recesses 450 arranged in a matrix of m rows and n columns. The second predetermined recess R2 is a first recess 450 adjacent to the second terminal portion 32 of the conductor 3 among the m×n first recesses 450 arranged in a matrix of m rows and n columns. The third predetermined recess R3 is a first recess 450 located between the first predetermined recess R1 and the second predetermined recess R2 among the m×n first recesses 450 arranged in a matrix of m rows and n columns. In addition, in the present disclosure, when referring to a "predetermined recess", the number of columns "n" may be a natural number greater than 3.

[0175] For example, the first predetermined recess R1 is any one of the m first recesses 450 in the first column closest to the first terminal portion 31 among the m×n first recesses 450. In addition, the second predetermined recess R2 is a first recess 450 located in the same row as the first predetermined recess R1 among the m first recesses 450 in the nth column closest to the second terminal portion 32 (farthest from the first terminal portion 31). In addition, the third predetermined recess R3 is any one of the (n-2) first recesses 450 located in the same row as the first predetermined recess R1 and the second predetermined recess R2 among the m×(n-2) first recesses 450 in the second to (n-1)th columns.

[0176] In the present embodiment, the volume of the first predetermined recess R1 and the volume of the second predetermined recess R2 are respectively larger than the volume of the third predetermined recess R3. In other words, the volume of the first predetermined recess R1 is larger than the volume of the third predetermined recess R3, and the volume of the second predetermined recess R2 is larger than the volume of the third predetermined recess R3. Here, "the volume of the first recess 450 (each of the first predetermined recess R1 to the third predetermined recess R3)" refers to the volume (capacity) of the space surrounded by the inner surface (inner bottom surface and inner side surface) and the opening surface of the first recess 450.

[0177] In addition, the lateral width D1 of the first predetermined recess R1 and the lateral width D2 of the second predetermined recess R2 are respectively larger than the lateral width D3 of the third predetermined recess R3. In other words, the lateral width D1 of the first predetermined recess R1 is larger than the lateral width D3 of the third predetermined recess R3, and the lateral width D2 of the second predetermined recess R2 is larger than the lateral width D3 of the third predetermined recess R3. "The lateral width D1 of the first predetermined recess R1", "the lateral width D2 of the second predetermined recess R2" and "the lateral width D3 of the third predetermined recess R3" are the widths along the direction in which the first predetermined recess R1, the second predetermined recess R2 and the third predetermined recess R3 are arranged. In the present embodiment, the first predetermined recess R1, the second predetermined recess R2 and the third predetermined recess R3 are arranged along the curved shape of the outer side surface of the cylindrical portion 41. Therefore, in the present embodiment, “the lateral widths D1 to D3 of the first predetermined recess R1 to the third predetermined recess R3 along the direction in which the first predetermined recess R1, the second predetermined recess R2, and the third predetermined recess R3 are arranged” refer to the dimensions of the curved shape of the first predetermined recess R1 to the third predetermined recess R3 along the outer surface of the barrel 41 in the direction in which the first predetermined recess R1, the second predetermined recess R2, and the third predetermined recess R3 are arranged (here, the circumferential direction of the outer surface of the barrel 41) (refer to Fig.10 ).

[0178] In addition, when the number of columns "n" is 4 or more, there may be two or more third predetermined recesses R3 between the first predetermined recess R1 and the second predetermined recess R2. In this case, it is sufficient that the volume of at least one of the two or more third predetermined recesses R3 is smaller than the volume of the first predetermined recess R1 and the volume of the second predetermined recess R2. In addition, it is sufficient that the lateral width D3 of at least one of the two or more third predetermined recesses R3 is smaller than the lateral width D1 of the first predetermined recess R1 and the lateral width D2 of the second predetermined recess R2. Of course, it is also possible that the volume (or lateral width D3) of each of the two or more third predetermined recesses R3 is smaller than the volume (or lateral width D1) of the first predetermined recess R1, and smaller than the volume (or lateral width D2) of the second predetermined recess R2.

[0179] In this embodiment, the number of rows "m" is "2" and the number of columns "n" is "3". Fig.11 As shown, the first recess group 45 includes 2×3 (=6) first recesses 450. The first recess group 45 is arranged in a matrix of two rows and three columns.

[0180] The 2×3 first recesses 450 include the first recess 450 arranged in the first row and the first column, i.e., the first predetermined recess R1, the first recess 450 arranged in the first row and the third column, i.e., the second predetermined recess R2, and the first recess 450 arranged in the first row and the second column, i.e., the third predetermined recess R3. The volume of the first predetermined recess R1 is larger than the volume of the third predetermined recess. The volume of the second predetermined recess R2 is larger than the volume of the third predetermined recess R3. In addition, the lateral width D1 of the first predetermined recess R1 is larger than the lateral width D3 of the third predetermined recess. The lateral width D2 of the second predetermined recess R2 is larger than the lateral width D3 of the third predetermined recess R3.

[0181] From another point of view, Fig.11 As shown, the first recess group 45 includes 2×3 first recesses 450 arranged in a matrix of two rows and three columns. The 2×3 first recesses 450 include a first predetermined recess S1 and a second predetermined recess S2. The first predetermined recess S1 is the first recess 450 arranged in the first row and the first column among the 2×3 first recesses 450. The second predetermined recess S2 is the first recess 450 arranged in the second row and the first column among the 2×3 first recesses 450. The second predetermined recess S2 is located below the first predetermined recess S1.

[0182] Furthermore, in the present embodiment, the volume of the first predetermined recess S1 is smaller than the volume of the second predetermined recess S2. In addition, the longitudinal width of the first predetermined recess S1 is smaller than the longitudinal width of the second predetermined recess S2. The "longitudinal width of the first predetermined recess S1" and the "longitudinal width of the second predetermined recess S2" are the widths along the direction in which the first predetermined recess S1 and the second predetermined recess S2 are arranged.

[0183] (1.4.2) Thick wall

[0184] The cylindrical body 41 of the resin member 4 has a portion (hereinafter also referred to as a “thick wall portion 47 ”) in which the first recessed portion 450 is not provided in the front region of the outer surface.

[0185] In more detail, Fig.11 As shown, the m×n first recesses 450 include an upper recess T1 and a lower recess T2. The upper recess T1 is a first recess 450 located upward relative to the conductor 3. The lower recess T2 is a first recess 450 located downward relative to the conductor 3.

[0186] For example, the upper recess T1 is any one of the one or more first recesses 450 located at a position offset upward relative to the conductor 3. The lower recess T2 is a first recess 450 located below the upper recess T1 among the one or more first recesses 450 located at a position offset downward relative to the conductor 3.

[0187] In addition, for example, the upper recess T1 may be any one of the n first recesses 450 in the first row, which is the uppermost row, among the m×n first recesses 450 arranged in a matrix of m rows and n columns. The lower recess T2 may be a first recess 450 located in the same column as the upper recess T1 among the n first recesses 450 in the mth row (the second row in the present embodiment) which is the lowermost row.

[0188] In the present embodiment, as an example, the upper recess T1 of the 2×3 first recesses 450 arranged in a matrix of two rows and three columns is the first recess 450 in the first row and first column. The lower recess T2 is the first recess 450 in the second row and first column.

[0189] The thick portion 47 includes a first thick portion 471 to a third thick portion 473 .

[0190] The first thick wall portion 471 is a portion above the upper recess T1 in the barrel portion 41. The first thick wall portion 471 is annular and has a thickness in the radial direction of the barrel portion 41. The first thick wall portion 471 is located above the entire m×n first recesses 450. The first thick wall portion 471 is located below the first storage groove 43. That is, the first thick wall portion 471 is located between the first storage groove 43 and the first recess group 45 in the up-down direction.

[0191] The second thick wall portion 472 is a portion below the lower recess T2 in the barrel portion 41. The second thick wall portion 472 is annular and has a thickness in the radial direction of the barrel portion 41. The second thick wall portion 472 is located below the entire m×n first recesses 450. The second thick wall portion 472 is located above the second storage groove 44. That is, the second thick wall portion 472 is located between the second storage groove 44 and the first recess group 45 in the up-down direction.

[0192] The third thick wall portion 473 is a portion located between the upper recessed portion T1 and the lower recessed portion T2 in the cylindrical portion 41. The third thick wall portion 473 is annular and has a thickness in the radial direction of the cylindrical portion 41. The third thick wall portion 473 is located below the n first recessed portions 450 in the first row of the m×n first recessed portions 450 arranged in a matrix of m rows and n columns, and above the n first recessed portions 450 in the m-th row.

[0193] like Figure 4 As shown in FIG. 4 , the thickness of the third thick wall portion 473 is thicker than the thickness of the first thick wall portion 471 and thicker than the thickness of the second thick wall portion 472. Figure 4 As shown, here, the inner diameter of the first thick portion 471 is the same as the inner diameter of the third thick portion 473 , and is smaller than the inner diameter of the second thick portion 472 .

[0194] In addition, the outer diameter A1 of the first thick-walled portion 471 and the outer diameter A2 of the second thick-walled portion 472 are respectively smaller than the outer diameter A3 of the third thick-walled portion 473. In other words, the outer diameter A1 of the portion above the upper recess T1 in the resin member 4 (the first thick-walled portion 471) and the outer diameter A2 of the portion below the lower recess T2 in the resin member 4 (the second thick-walled portion 472) are respectively smaller than the outer diameter A3 of the portion between the upper recess T1 and the lower recess T2 in the resin member 4 (the third thick-walled portion 473).

[0195] In addition, if Fig.11 As shown, the thick portion 47 further includes a fourth thick portion 474. The fourth thick portion 474 is a portion between the first recess group 45 and the conductor 3 in the left-right direction of the cylindrical portion 41.

[0196] The thick portion 47 further includes a fifth thick portion 475. The fifth thick portion 475 is a portion between two first recesses 450 adjacent in the left-right direction (ie, in the same row) in the barrel 41. When the number of columns "n" is "1", the fifth thick portion 475 does not exist.

[0197] (1.4.3) Effects of the first recess group

[0198] As described above, if the cutting device 10 performs a cutting action, there is a situation where an arc is generated in the internal space 400 of the resin component 4. Therefore, the resin component 4 is required to withstand the pressure of the arc. In order to improve the pressure resistance of the arc, it is considered to thicken the thickness of the resin component 4. However, if the thickness of the resin component 4 is thickened as a whole, the amount of resin material required to form the resin component 4 increases. In addition, if the thickness of the resin component 4 is thickened as a whole, there is a situation as follows: it is easy to generate gaps inside the resin component 4, which makes the formability worse, and the pressure resistance of the arc decreases. Therefore, in the cutting device 10 of the present embodiment, by providing the first recess group 45 including m×n first recesses 450 arranged in a matrix of m rows and n columns on the resin component 4, the amount of resin material is reduced while maintaining the strength of the resin component 4.

[0199] That is, by providing at least one first recess 450 in the front region of the outer side surface of the resin member 4, a relatively thin portion (a portion provided with the first recess 450) and a relatively thick portion (a portion not provided with the first recess 450; the thick-walled portion 47) are formed in the resin member 4. As a result, it is possible to suppress the deterioration of the formability of the resin member 4 and thus suppress the generation of voids in the resin member 4, and to achieve an improvement in the strength of the resin member 4. In addition, compared with a case where even one first recess 450 is not provided, the amount of resin material required to form the resin member 4 can be reduced.

[0200] In particular, by providing the first recess 450 in the front region of the outer side surface of the resin member 4, a relatively thick portion (fourth thick wall portion 474) is naturally formed in the left and right regions (regions where the conductor 3 protrudes) of the outer side surface of the resin member 4. The left and right regions of the resin member 4 are portions that hold the conductor 3, and are portions of the resin member 4 that are most likely to receive force from the conductor 3 when the connecting portion 36 is cut from the first holding portion 34 and the second holding portion 35. Therefore, by having the fourth thick wall portion 474 in this region, the possibility of damage to the resin member 4 when the conductor 3 is broken can be reduced.

[0201] In addition, by arranging the plurality of first recesses 450 in a matrix of m rows and n columns (m is a natural number greater than or equal to 2), a wall-like portion extending leftward and rightward like the third thick-walled portion 473 is formed. In addition, when the number of columns "n" is greater than or equal to "2", a wall-like portion extending up and down like the fifth thick-walled portion 475 is formed. Thus, compared with the case where the plurality of first recesses 450 are randomly arranged, the strength of the resin member 4 can be improved.

[0202] In particular, by setting m to a natural number greater than or equal to 2, the third thick portion 473 is formed between the upper recessed portion T1 and the lower recessed portion T2. ​​This can further improve the strength of the resin member 4.

[0203] In addition, by making the thickness (dimension in the radial direction) of the third thick wall portion 473 thicker than the thickness of the first thick wall portion 471 and the thickness of the second thick wall portion 472, the strength of the portion of the resin member 4 that is most likely to receive force from the conductor 3 when the connecting portion 36 is cut from the first retaining portion 34 and the second retaining portion 35 can be improved. In addition, the third thick wall portion 473 is also the portion of the resin member 4 that is most likely to receive pressure from the arc, so the arc withstand voltage can be further improved.

[0204] In particular, by arranging the third thick portion 473 so as to overlap with the conductor 3 in a front view, it is possible to further improve the strength of the resin member 4 .

[0205] In addition, by making the volume of the first predetermined recess R1 and the volume of the second predetermined recess R2 larger than the volume of the third predetermined recess R3 (in other words, the volume of the space in the third predetermined recess R3 is relatively reduced), the strength of the portion around the third predetermined recess R3 in the resin member 4, which is relatively close to the igniter 2 and is easily applied with a large pressure, can be improved. In addition, by making the lateral width D1 of the first predetermined recess R1 and the lateral width D2 of the second predetermined recess R2 larger than the lateral width D3 of the third predetermined recess R3 (in other words, the lateral width D3 of the third predetermined recess R3 is relatively reduced), the strength of the portion around the third predetermined recess R3 in the resin member 4, which is relatively close to the igniter 2 and is easily applied with a large pressure, can be improved.

[0206] In addition, by making the volume of the first predetermined recess S1 smaller than the volume of the second predetermined recess S2, the strength of the portion around the first predetermined recess S1 in the resin member 4, which is relatively close to the igniter 2 and easily subjected to a large pressure, can be improved. In addition, by making the longitudinal width of the first predetermined recess S1 smaller than the longitudinal width of the second predetermined recess S2, the strength of the portion around the first predetermined recess S1 in the resin member 4, which is relatively close to the igniter 2 and easily subjected to a large pressure, can be improved.

[0207] In addition, in the cutting device 10 of the present embodiment, Figure 4 , Fig.10 As shown in the figure, the first recess group 45 faces the inner side of the housing 1. That is, the housing 1 is arranged to face the portion of the resin member 4 where the first recess 450 is formed and the strength is relatively low. Thus, the resin member 4 can be reinforced by the housing 1, and the mechanical strength of the cutting device 10 can be improved.

[0208] In particular, in the cutting device 10 of the present embodiment, Figure 4 As shown, at least one of the m×n first recesses 450 (three first recesses 450 in the second row in this embodiment) faces the region where the first joint 116 of the upper housing 11 and the second joint 124 of the lower housing 12 overlap. That is, a portion of the housing 1 having relatively high strength (a portion where the first joint 116 of the upper housing 11 and the second joint 124 of the lower housing 12 overlap) is arranged so as to face a portion of the resin member 4 having the first recess 450 and relatively low strength. Thus, the resin member 4 can be reinforced by the housing 1, and the mechanical strength of the cutting device 10 can be improved.

[0209] In addition, if Figure 4 As shown, the upper end of the lower housing 12 contacts the inner side surface of at least one of the m×n first recesses 450 (three first recesses 450 in the second row in this embodiment). Thus, the housing 1 can be used to reinforce the resin member 4, and the mechanical strength of the cutting device 10 can be improved.

[0210] (1.4.4) 2nd concave portion group

[0211] As described above, the second recessed portion group 46 is provided in the rear region on the outer surface of the cylindrical portion 41 .

[0212] The second recess group 46 includes m×n second recesses 460 as the plurality of second recesses 460. That is, the second recess group 46 includes the same number (m×n) of second recesses 460 as the number of first recesses 450 included in the first recess group 45. The m×n second recesses 460 of the second recess group 46 are arranged in a matrix of m rows and n columns in a rear view.

[0213] As described above, the first recess group 45 is provided in the front area of ​​the outer side of the cylinder 41, and the second recess group 46 is provided in the rear area of ​​the outer side of the cylinder 41, so the conductor 3 is located between the first recess group 45 and the second recess group 46. Figure 10 to Figure 12As shown in FIG. 1 , the first recess group 45 and the second recess group 46 are located on opposite sides of the conductor 3. In the present embodiment, the first recess group 45 and the second recess group 46 are particularly arranged line-symmetrically when viewed from above. Thus, compared with the case where only the first recess group 45 is formed in the resin member 4, it is less likely that a portion with weak strength is formed in the resin member 4.

[0214] The m×n second recesses 460 included in the second recess group 46 can also be set to the first predetermined recess R1 to the third predetermined recess R3, the first specified recess S1 and the second specified recess S2, the upper recess T1 and the lower recess T2, similarly to the first recess 450. In addition, the second recess group 46 is formed to be line symmetrical (mirror symmetrical) with the first recess group 45, so the detailed description of the arrangement, shape, effect, etc. of the second recess group 46 is omitted.

[0215] In the cutting device 10 of this embodiment, in addition to the first recess group 45, the resin member 4 is also provided with a second recess group 46, so that the strength of the resin member 4 can be maintained and the amount of resin material required to form the resin member 4 can be further reduced.

[0216] (2) Modification

[0217] The above-mentioned embodiment is only one of the various embodiments of the present disclosure. The above-mentioned embodiment can be modified in various ways according to the design, etc. as long as the purpose of the present disclosure can be achieved. The following lists the modified examples of the embodiment. The above-mentioned embodiment and the modified examples described below can be appropriately combined for application. In the description of each modified example below, there is a case where the description of the same structure as the cutting device 10 of the above-mentioned embodiment is appropriately omitted.

[0218] (2.1) Modification 1

[0219] In the cutting device 10 of this modified example, Fig.13A As shown in the figure, the plurality of grooves 38 provided on at least one (for example, both) of the upper surface and the lower surface of the first holding part 34 of the conductor 3 only have the first groove 381. That is, when viewed from above, the plurality of grooves 38 (the plurality of first grooves 381) extend in a direction (front-rear direction) orthogonal to the direction (left-right direction) in which the conductor 3 extends. In addition, although not shown in the figure, in the cutting device 10 of this modified example, the plurality of grooves 39 provided on at least one (for example, both) of the upper surface and the lower surface of the second holding part 35 of the conductor 3 only have the first groove 391. When viewed from above, the plurality of grooves 39 (the plurality of first grooves 391) extend in a direction (front-rear direction) orthogonal to the direction (left-right direction) in which the conductor 3 extends.

[0220] like Fig. 13BAs shown, each of the plurality of grooves 38 (plurality of first grooves 381) has a V-shaped cross section. In addition, each of the plurality of grooves 39 (plurality of first grooves 391) has a V-shaped cross section.

[0221] In the cutting device 10 of the present modification as well, it is possible to suppress the gas based on the conductivity of the arc from leaking to the outside of the casing 1 .

[0222] (2.2) Modification 2

[0223] In the cutting device 10 of this modified example, Fig.14 As shown in the figure, the plurality of grooves 38 provided on at least one (for example, both) of the upper surface and the lower surface of the first holding part 34 of the conductor 3 only have the second groove 382. That is, when viewed from above, the plurality of grooves 38 (the plurality of second grooves 382) extend in a direction oblique to the direction (left-right direction) in which the conductor 3 extends. In addition, although not shown in the figure, in the cutting device 10 of this modified example, the plurality of grooves 39 provided on at least one (for example, both) of the upper surface and the lower surface of the second holding part 35 of the conductor 3 only have the second groove 392. When viewed from above, the plurality of grooves 39 (the plurality of second grooves 392) are oblique to the direction (left-right direction) in which the conductor 3 extends.

[0224] In the present modification as well, each of the plurality of grooves 38 (plurality of second grooves 382 ) has a V-shaped cross section, and each of the plurality of grooves 39 (plurality of second grooves 392 ) has a V-shaped cross section.

[0225] In the cutting device 10 of the present modification as well, it is possible to suppress the gas based on the conductivity of the arc from leaking to the outside of the casing 1 .

[0226] In addition, the plurality of grooves 38 (or the plurality of grooves 39) provided in the first holding portion 34 (or the second holding portion 35) of the conductor 3 may be provided with different grooves on the upper surface and the lower surface. For example, the first holding body 34 (or the second holding body 35) may be provided with a plurality of first grooves 381 (or the plurality of first grooves 391) on the upper surface, and the second holding body 34 (or the second holding body 35) may be provided with a plurality of second grooves 382 (or the plurality of second grooves 392) on the lower surface. In addition, the plurality of grooves 38 provided in the first holding portion 34 may be different from the plurality of grooves 39 provided in the second holding portion 35. For example, the first holding body 34 may be provided with only the first groove 381, and the second holding body 35 may be provided with only the second groove 392.

[0227] (2.3) Modification 3

[0228] In the cutting device 10 of this modified example, Fig.15As shown, the first holding portion 34 has a plurality of through holes 340. Furthermore, the through hole 344 in the above embodiment is one of the plurality of through holes 340. In other words, the first holding portion 34 has one or more through holes 340 in addition to the through hole 344 in the above embodiment. A through hole 340 independent of the through hole 344 is also buried in the resin member 4. The through hole 340 independent of the through hole 344 is circular in shape.

[0229] like Fig.15 As shown, the through hole 340 which is independent of the through hole 344 is formed at a position partially overlapping with the through hole 344 in a front view (when viewed from the front along the X-axis).

[0230] In the cutting device 10 of this modified example, the first holding portion 34 has a plurality of through holes 340, thereby making it easier to prevent the conductive gas based on the arc from leaking to the outside of the housing 1. That is, the plurality of through holes 340 function as an arc shielding structure that prevents the conductive gas based on the arc from leaking to the outside of the housing 1.

[0231] In addition, similar to the plurality of through holes 340 of the first holding portion 34 , the second holding portion 35 may also have a plurality of through holes.

[0232] (2.4) Modification 4

[0233] In the cutting device 10 of this modified example, Fig.16 As shown, the first holding portion 34 has a plurality of through holes 340. The through hole 344 in the above embodiment is one of the plurality of through holes 340. However, the length of the through hole 344 is longer than the length L13 (see FIG. 1 ) between the first end P11 and the second end P12 of the boundary line B1 between the connecting portion 36 and the first holding portion 34. Fig. 9 )short.

[0234] like Fig.16 As shown, the plurality of through holes 340 are respectively circular in shape. In addition, the plurality of through holes 340 are arranged so that the centers of all the through holes 340 are not consistent in the left-right direction (in other words, the center of at least one through hole 340 is offset from the center of at least one other through hole 340 in the left-right direction). The reason is that, if it is assumed that the centers of all the through holes 340 are consistent in the left-right direction, there is a possibility that the cross-sectional area of ​​the portion in which the through holes 340 are formed in the first retaining portion 34 in the plane orthogonal to the left-right direction becomes smaller, and the electrical conduction performance at this portion becomes lower. However, without limitation to this, the plurality of through holes 340 may also be arranged so that the centers of all the through holes 340 are consistent in the left-right direction.

[0235] (2.5) Modification 5

[0236] In the cutting device 10 of this modified example, Fig.17 As shown in FIG. 1 , the first holding portion 34 has a convex portion 348 . The convex portion 348 is embedded in the resin member 4 .

[0237] like Fig.17 As shown in FIG. 1 , the first holding portion 34 has two protrusions 348. Each protrusion 348 is triangular in plan view. Each protrusion 348 protrudes rightward from the side surface (right side surface) of the connecting portion 343 of the first holding portion 34.

[0238] By providing the first holding portion 34 with the convex portion 348, the moving distance of the conductive gas that attempts to escape to the outside of the housing 1 is increased, similarly to the concave portion 345. As a result, the gas is less likely to leak to the outside of the housing 1, and the cooling of the gas can be promoted. That is, the convex portion 348 functions as an arc shielding structure that prevents the conductive gas due to the arc from leaking to the outside of the housing 1.

[0239] Furthermore, the second holding portion 35 may also have a convex portion similar to the convex portion 348 of the first holding portion 34 .

[0240] (2.6) Modification 6

[0241] In the cutting device 10 of this modified example, Fig.18 As shown in FIG. 1 , the first holding portion 34 has a convex portion 349 . The convex portion 349 is embedded in the resin member 4 .

[0242] like Fig.18 As shown, the first holding portion 34 has two convex portions 349. Each convex portion 349 is provided on a side surface (front side surface or rear side surface) of the connecting portion 343 of the first holding portion 34 in place of the concave portion 345.

[0243] By providing the first holding portion 34 with the convex portion 349, the moving distance of the conductive gas trying to escape to the outside of the housing 1 is increased, similarly to the concave portion 345. That is, the convex portion 349 functions as an arc shielding structure that prevents the conductive gas due to the arc from leaking to the outside of the housing 1.

[0244] Furthermore, the second holding portion 35 may also have a convex portion similar to the convex portion 349 of the first holding portion 34 .

[0245] Alternatively, the first holding portion 34 (or the second holding portion 35 ) may have the convex portion 349 on one side surface (eg, the front side surface) and the concave portion 345 (or the concave portion 355 ) on the other side surface (eg, the rear side surface).

[0246] Furthermore, the first holding portion 34 (or the second holding portion 35 ) may include both the convex portion 348 described in the fifth modification and the convex portion 349 described in the sixth modification.

[0247] In addition, the first holding portion 34 and the second holding portion 35 may not have shapes that are symmetrical about the protrusions 348 and 349 .

[0248] (2.7) Modification 7

[0249] In the cutting device 10 of this modified example, Fig.19 As shown, the pusher 5 has a chamfered portion 54 on the outer peripheral edge of the lower bottom surface. The chamfered portion 54 is curved in an arc shape from the outer side surface to the lower bottom surface of the pusher 5. The chamfered portion 45 is formed on the support protrusion 53 here.

[0250] In the cutting device 10 of this modification, the possibility of damage to the pusher 5 can be reduced by providing the chamfered portion 45 .

[0251] (2.8) Modification 8

[0252] In the cutting device 10 of this modified example, Fig. 20A , Fig. 20B As shown, the pusher 5 has a protrusion 55 protruding downward at the center of the lower bottom surface. The protrusion 55 is circular in shape when viewed from above, and a circular hole based on the recess 521 is formed in the center. The protrusion 55 is formed at a position that does not overlap with the six recesses 522 (inside the area surrounded by the six recesses 522). The lower surface of the protrusion 55 is, for example, flush with the lower surface of the supporting protrusion 53 (located at the same position in the up-down direction).

[0253] In the cutting device 10 of this modification, since the protrusion 55 is provided, when the pusher 5 moves downward, the protrusion 55 first contacts the conductor 3 in the pusher 5. Thus, the possibility of damage to the pusher 5 can be reduced.

[0254] (2.9) Other variations

[0255] In the above-mentioned embodiments and various modifications, the conductor 3 is formed by a single member, but is not limited thereto, and may be formed by a plurality of members, for example. The connection portion 36 only needs to electrically connect the first terminal portion 31 and the second terminal portion 32. For example, the following structure may be adopted: the connection portion 36 has: a first fixed piece connected to the first holding portion 34; a second fixed piece connected to the second holding portion 35; and a movable piece, which connects the first fixed piece and the second fixed piece in the left-right direction, and the movable piece is pressed against the first fixed piece and the second fixed piece by an elastic member such as a spring.

[0256] In a modified example, the first holding portion 34 may not include at least one of the recessed portion 345 , the first recessed portion 346 , the second recessed portion 347 , and the plurality of grooves 38 . The same applies to the second holding portion 35 .

[0257] In a modified example, in the conductor 3, the length of the first holding portion 34 may be no longer than the length L13 between the first end P11 and the second end P12 of the boundary line B1 between the connection portion 36 and the first holding portion 34. As long as the first holding portion 34 has the through hole 344, the conductor 3 may be in the shape of a flat plate with a constant dimension in the front-rear direction.

[0258] In a modified example, the length L11 of the through hole 344 may be smaller than the length L13 between the first end P11 and the second end P12 of the boundary line B1 between the connection portion 36 and the first retaining portion 34. Even if the length L11 is smaller than the length L13, for example, the arc shielding structure can be used to block or detour the movement of a portion of the gas. The same is true for the length L21 of the through hole 354.

[0259] In a modified example, the first holding portion 34 and the second holding portion 35 may not have symmetrical shapes.

[0260] In a modified example, the cross-section of the groove 38 (or the groove 39 ) may not be in the shape of the letter V, but may be in the shape of the letter U, a semicircular arc, or the like.

[0261] (3) Method

[0262] As is apparent from the above-described embodiment and modified examples, the following aspects are disclosed in this specification.

[0263] The first embodiment of the cutting device (10) comprises a resin member (4), an igniter (2) and a conductor (3). The resin member (4) has an internal space (400). The igniter (2) fills the internal space (400) with gas. The conductor (3) is plate-shaped and is located below the igniter (2). The conductor (3) comprises: a first retaining portion (34) buried in the resin member (4); a second retaining portion (35) buried in the resin member (4); and a connecting portion (36) connecting the first retaining portion (34) and the second retaining portion (35). The first retaining portion (34) has a through hole (344).

[0264] According to this method, the movement of the conductive gas based on the arc is hindered by the embedded through hole (344) of the resin member (4), and the movement path of the gas becomes longer, so the conductive gas is less likely to leak to the outside of the cutting device (10).

[0265] The second embodiment of the cutting device (10) is based on the first embodiment, wherein the first holding portion (34) has a plurality of grooves (38) provided on the upper surface or the lower surface. Alternatively, the plurality of grooves (38) may be provided on both the upper surface and the lower surface. The plurality of grooves (38) are embedded in the resin member (4).

[0266] According to this method, the movement of the conductive gas based on the arc is blocked by the portion of the resin member (4) buried in the plurality of grooves (38), and the movement path of the gas becomes longer, so that the conductive gas is not easy to leak to the outside of the cutting device (10). In addition, the bite of the resin member (4) into the conductor (3) is optimized, which can improve the close contact of the resin member (4) with the conductor (3).

[0267] The third embodiment of the cutting device (10) is based on the second embodiment, and in a planar view, a plurality of grooves (first grooves 381) extend in a direction (front-back direction) orthogonal to the direction (left-right direction) in which the conductor (3) extends.

[0268] According to this method, the movement of the conductive gas based on the arc is hindered by the portion of the resin member (4) buried inside the plurality of grooves (the first groove 381), and the movement path of the gas becomes longer, so that the conductive gas is not easy to leak to the outside of the cutting device (10). In addition, the bite of the resin member (4) into the conductor (3) is optimized, which can improve the close contact of the resin member (4) with the conductor (3).

[0269] The fourth embodiment of the cutting device (10) is based on the second embodiment, and in a planar view, the plurality of grooves (second grooves 382) extend in a direction oblique to the direction (left-right direction) in which the conductor (3) extends.

[0270] According to this method, the movement of the conductive gas based on the arc is blocked by the portion of the resin member (4) buried inside the plurality of grooves (the second groove 382), and the movement path of the gas becomes longer, so that the conductive gas is not easy to leak to the outside of the cutting device (10). In addition, the bite of the resin member (4) into the conductor (3) is optimized, which can improve the close contact of the resin member (4) with the conductor (3).

[0271] For the cutting device (10) of the fifth mode, based on the second mode, in a planar perspective, the multiple grooves (38) include: a first groove (381), which extends in a direction (front-to-back direction) orthogonal to the direction (left-right direction) in which the conductor (3) extends; and a second groove (382), which extends in a direction oblique to the direction (left-right direction) in which the conductor (3) extends.

[0272] According to this method, the movement of the conductive gas based on the arc is hindered by the portion of the resin member (4) buried inside the first groove (381) and the second groove (382), and the movement path of the gas becomes longer, so the conductive gas is not easy to leak to the outside of the cutting device (10). In addition, the bite of the resin member (4) into the conductor (3) is optimized, which can improve the close contact of the resin member (4) with the conductor (3).

[0273] A sixth aspect of the cutting device (10) is a device according to any one of the second to fifth aspects, wherein each of the plurality of grooves (38) has a V-shaped cross section in a direction perpendicular to the direction in which the plurality of grooves (38) extend.

[0274] According to this method, the movement of the conductive gas based on the arc is blocked by the portion of the resin member (4) buried in the plurality of grooves (38), and the movement path of the gas becomes longer, so that the conductive gas is not easy to leak to the outside of the cutting device (10). In addition, the bite of the resin member (4) into the conductor (3) is optimized, which can improve the close contact of the resin member (4) with the conductor (3).

[0275] A seventh aspect of the cutting device (10) is characterized in that, in addition to any one of the first to sixth aspects, the first holding portion (34) has a recess (345) formed on a side surface. The recess (345) is embedded in the resin member (4).

[0276] According to this method, the movement of the conductive gas based on the arc is partially blocked by the inner part of the embedded recess (345) of the resin member (4), and the movement path of the gas is lengthened, so the conductive gas is less likely to leak to the outside of the cutting device (10).

[0277] The cutting device (10) of the eighth aspect is any one of the first to seventh aspects, wherein the first holding portion (34) has convex portions (348, 349). The convex portions (348, 349) are embedded in the resin member (4).

[0278] According to this method, the movement of the conductive gas based on the arc is blocked by the protrusions (348, 349), and the movement path of the gas is lengthened, so the conductive gas is less likely to leak to the outside of the cutting device (10).

[0279] In a ninth aspect of the cutting device (10), in addition to any one of the first to eighth aspects, the first holding portion (34) further includes a first recess (346) connected to the through hole (344). The first recess (346) is embedded in the resin member (4).

[0280] According to this method, the movement of the conductive gas based on the arc is blocked by the portion of the resin member (4) buried inside the first recess (346), and the movement path of the gas becomes longer, so the conductive gas is not easy to leak to the outside of the cutting device (10). In addition, the strength of the portion of the resin member (4) inside the through hole (344) can be improved.

[0281] According to a tenth embodiment of the cutting device (10), in addition to the ninth embodiment, the first holding portion (34) further comprises a second recess (347). The first recess (346) and the through hole (344) are located between the second recess (347) and the connecting portion (36). The second recess (347) is embedded in the resin member (4).

[0282] According to this method, the movement of the conductive gas based on the arc is hindered by the portion of the resin member (4) buried inside the second recess (347), and the movement path of the gas becomes longer, so the conductive gas is less likely to leak to the outside of the cutting device (10).

[0283] For the cutting device (10) of the 11th mode, based on any one of the first to tenth modes, in a planar perspective, in a direction (front-to-back direction) orthogonal to the direction (left-right direction) in which the conductor (3) extends, the length of the first retaining portion (34) is longer than the length (L13) between the first end (P1) and the second end (P2) of the boundary line (B1) between the connecting portion (36) and the first retaining portion (34), and the length (L11) of the through hole (344) is the same as or longer than the length (L13) between the first end (P1) and the second end (P2) of the boundary line (B1) between the connecting portion (36) and the first retaining portion (34).

[0284] According to this method, the conductive gas based on the arc needs to bypass the portion of the resin component (4) located in the through hole (344) in order to escape to the outside of the cutting device (10), so the conductive gas is less likely to leak to the outside of the cutting device (10).

[0285] The cutting device (10) of the twelfth aspect is any one of the first to eleventh aspects, wherein the first holding portion (34) has a plurality of through holes (340). The through hole (344) is one of the plurality of through holes (340).

[0286] According to this method, the movement of the conductive gas based on the arc is hindered by the portion of the resin member (4) buried in the through hole (340), and the movement path of the gas becomes longer, so the conductive gas is less likely to leak to the outside of the cutting device (10).

[0287] Description of Reference Numerals

[0288] 10. Cutting device; 2. Igniter; 3. Conductor; 34. First holding portion; 340. Through hole; 344. Through hole; 345. Recess; 346. First recess; 347. Second recess; 348. Protrusion; 349. Protrusion; 35. Second holding portion; 36. Connecting portion; 38. Groove; 381. First groove; 382. Second groove; 4. Resin member; 400. Internal space; B1. Boundary line; L11. Length; L13. Length; P11. First end portion; P12. Second end portion.

Claims

1. A cutting device, wherein: The cutting device has: a resin member having an internal space; an igniter that fills the inner space with gas; and A plate-shaped conductor located below the igniter, The conductor has: a first holding portion embedded in the resin member; a second holding portion embedded in the resin member; and a connecting portion connecting the first holding portion and the second holding portion, The first holding portion has a through hole.

2. The cutting device according to claim 1, wherein: The first holding portion has a plurality of grooves provided on the upper surface or the lower surface. The plurality of grooves are embedded in the resin member.

3. The cutting device according to claim 2, wherein: In a planar view, the plurality of grooves extend in a direction perpendicular to a direction in which the electrical conductor extends.

4. The cutting device according to claim 2, wherein: In a planar view, the plurality of grooves extend in a direction oblique to a direction in which the electrical conductor extends.

5. The cutting device according to claim 2, wherein: From a planar perspective, the plurality of grooves include: a first groove extending in a direction perpendicular to a direction in which the conductor extends; and The second groove extends in a direction oblique to the direction in which the conductor extends.

6. The cutting device according to any one of claims 2 to 5, wherein: In a direction perpendicular to the direction in which the plurality of grooves extend, each of the plurality of grooves has a V-shaped cross section.

7. The cutting device according to any one of claims 1 to 6, wherein: The first holding portion has a recess formed on a side surface. The recessed portion is embedded in the resin member.

8. The cutting device according to any one of claims 1 to 7, wherein: The first holding portion has a convex portion, The protrusion is embedded in the resin member.

9. The cutting device according to any one of claims 1 to 8, wherein: The first holding portion further has a first recess connected to the through hole, The first recess is embedded in the resin member.

10. The cutting device according to claim 9, wherein: The first holding portion further has a second recess, The first recess and the through hole are located between the second recess and the connecting portion. The second recess is buried in the resin member.

11. The cutting device according to any one of claims 1 to 10, wherein: In a planar perspective, in a direction orthogonal to the direction in which the conductor extends, The length of the first holding portion is longer than the length between the first end and the second end of the boundary line between the connecting portion and the first holding portion. The length of the through hole is the same as or longer than the length between the first end and the second end of the boundary line between the connection portion and the first holding portion.

12. The cutting device according to any one of claims 1 to 11, wherein: The first holding portion has a plurality of through holes. The through hole is one of the plurality of through holes.

Images