JP2022014127A - Fuse unit and cover assembly - Google Patents

Abstract

To provide a fuse unit and cover assembly, which can absorb the difference of a nut size and can stabilize the positioning of a fuse unit and a cover.SOLUTION: In the fuse unit and cover assembly including a fuse unit, having a bolt 5 and a nut 7, and a cover which covers the outer periphery of the fuse unit, the cover includes: a protection wall; and a positioning part 15 which, by contacting to the outer periphery of the nut 7, positions the fuse unit and the cover in a planar direction which intersects the axial direction of the bolt 5. The positioning part 15 includes: an inside part 17 formed in an elastically deformable manner to contact to the outer periphery of the nut 7; and an outside part 19, integrally formed on the inside part 17 and the protection wall and arranged apart from the outer periphery of the nut 7, to have set rigidity higher than the inside part 17.SELECTED DRAWING: Figure 4

Description

The present invention relates to an assembly of a fuse unit and a cover.

Conventionally, as an assembly of a fuse unit and a cover, a fuse unit having a battery terminal, a bolt electrically connected to the battery terminal, and a polygonal nut fastened to the bolt to fix the battery terminal is provided. There is. Further, it is known that the fuse unit is assembled and provided with a protective cover that covers the outer periphery of the fuse unit (see Patent Document 1).

In the assembly of the fuse unit and the cover, the protective cover has a fixing cover for covering the front side of the fuse unit, and an opening / closing cover provided on the fixing cover via a hinge portion so as to be openable / closable. The inner surface of the opening / closing cover is provided with a boss as a positioning portion in which the outer periphery of the nut abuts on the inner surface and is accommodated, and the fuse unit and the cover are positioned in the plane direction intersecting the axial direction of the bolt.

By the way, in the structure in which the outer periphery of the nut is brought into contact with the inner surface of the boss, if the size of the nut is different, the nut may not be accommodated inside the boss. Therefore, it is necessary to mold the boss according to the size of the nut, and there is a concern that the cost of the cover will increase.

Therefore, as an assembly of another fuse unit and a cover, it is known that a cylindrical adherend portion as a positioning portion abutting on the outer circumference of a nut provided on the cover is formed of an elastic material. (See Patent Document 2).

In this assembly of the fuse unit and the cover, the cylindrical adherend is made of an elastic material, so even if the nut size is different, the cylindrical adherend is elastically deformed and the cylindrical coat is formed. The inner surface of the landing portion is elastically abutted on the outer circumference of the nut. Therefore, one cylindrical adhered portion can absorb the difference in nut size, and the cost of the cover can be reduced.

Japanese Unexamined Patent Publication No. 2016-10330 Japanese Unexamined Patent Publication No. 2016-25033

By the way, in the assembly of the fuse unit and the cover as in Patent Document 2, since the positioning portion is elastically deformed, the difference in nut size can be absorbed. However, if the positioning portion is elastically deformed, the positioning portion may be excessively elastically deformed when an external force is applied to the cover in the plane direction intersecting the axial direction of the bolt. If excessive elastic deformation occurs in the positioning portion in this way, the positioning portion cannot position the fuse unit and the cover in the plane direction intersecting the axial direction of the bolt.

The present invention has been made in view of the problems of the prior art. An object of the present invention is to provide an assembly of a fuse unit and a cover capable of absorbing a difference in nut size and stabilizing the positioning of the fuse unit and the cover.

The assembly of the fuse unit and the cover according to the present embodiment has a battery terminal, a bolt electrically connected to the battery terminal, and a polygonal nut fastened to the bolt to fix the battery terminal. A fuse unit and a cover attached to the fuse unit and covering the outer periphery of the fuse unit are provided, and the cover includes a protective wall arranged on the outer periphery of the nut and the protective wall toward the nut. A positioning portion that extends and abuts on the outer periphery of the nut to position the fuse unit and the cover in a plane direction intersecting the axial direction of the bolt is provided, and the positioning portion is formed so as to be elastically deformable. The inner portion that comes into contact with the outer periphery of the nut, the inner portion, and the protective wall are integrally formed, and are arranged apart from the outer periphery of the nut, and are set to have higher rigidity than the inner portion. It has an outer part.

It is preferable that the outer portion is formed of one member continuous with the protective wall, and the inner portion is formed with a member continuous with the outer portion and thinner than the outer portion.

The inner portion preferably has a circular portion formed in a circular shape abutting on the nut, and a plurality of ribs connecting the circular portion and the outer portion.

It is preferable that the nut is formed in an even regular polygonal shape, and the inner diameter of the circular portion is set to be smaller than the width between the two parallel sides of the nut.

The cover is assembled to the fuse unit along the axial direction of the bolt, and the outer portion is a cylinder capable of accommodating the bolt and the nut inside from the protective wall along the assembly direction. It is preferable that the tip of the outer portion extending in a shape and in the assembling direction is in contact with the fuse unit with the cover attached to the fuse unit.

According to the present invention, it is possible to provide an assembly of a fuse unit and a cover capable of absorbing a difference in nut size and stabilizing the positioning of the fuse unit and the cover.

It is an exploded perspective view of the assembly body of a fuse unit and a cover which concerns on this embodiment. It is a front view of the positioning part of the cover which concerns on this embodiment. It is sectional drawing of the positioning part of the cover which concerns on this embodiment. It is sectional drawing when the positioning part of the assembly body of a fuse unit and a cover which concerns on this embodiment abuts on a nut. It is sectional drawing when the positioning part of the assembly body of a fuse unit and a cover which concerns on this embodiment abuts on nuts of different sizes.

Hereinafter, the fuse unit and cover assembly according to the present embodiment will be described in detail with reference to the drawings. The dimensional ratios in the drawings are exaggerated for convenience of explanation and may differ from the actual ratios.

The fuse unit and cover assembly 1 according to the present embodiment has a battery terminal 3, a bolt 5 electrically connected to the battery terminal 3, and a polygonal nut fastened to the bolt 5 to fix the battery terminal 3. It is provided with a fuse unit 9 having a 7. Further, a cover 11 which is attached to the fuse unit 9 and covers the outer periphery of the fuse unit 9 is provided.

Further, the cover 11 is provided with a protective wall 13 arranged on the outer periphery of the nut 7. Further, the cover 11 extends from the protective wall 13 toward the nut 7, and abuts on the outer periphery of the nut 7 to position the fuse unit 9 and the cover 11 in a plane direction intersecting the axial direction of the bolt 5. A portion 15 is provided.

The positioning portion 15 is formed so as to be elastically deformable, and has an inner portion 17 that is in contact with the outer periphery of the nut 7. Further, the positioning portion 15 has an outer portion 19 which is integrally formed with the inner portion 17 and the protective wall 13, is arranged apart from the outer periphery of the nut 7, and is set to have a higher rigidity than the inner portion 17.

Further, the outer portion 19 is formed of one member continuous with the protective wall 13. The inner portion 17 is a member continuous with the outer portion 19 and is formed thinner than the outer portion 19.

Further, the inner portion 17 has a circular portion 21 formed in a circular shape abutting on the nut 7, and a plurality of ribs 23 connecting the circular portion 21 and the outer portion 19.

Further, the nut 7 is formed in an even number of regular polygonal shapes. The inner diameter D1 of the circular portion 21 is set smaller than the width L1 between the two parallel sides 25 and 25 of the nut 7.

Further, the cover 11 is attached to the fuse unit 9 along the axial direction of the bolt 5. Further, the outer side portion 19 extends from the protective wall 13 in a cylindrical shape so as to accommodate the bolt 5 and the nut 7 inside along the assembly direction. The tip 27 of the outer portion 19 in the assembly direction is in contact with the fuse unit 9 with the cover 11 assembled to the fuse unit 9.

As shown in FIG. 1, the fuse unit and cover assembly 1 according to the present embodiment is applied to a battery (not shown) mounted on a vehicle. A battery post is projected from the surface of the housing of the battery, and the fuse unit 9 is electrically connected to the battery post. Various devices mounted on the vehicle are electrically connected to the fuse unit 9. The various devices mounted on the vehicle in this way are electrically connected to the battery via the fuse unit 9 and are operated by the power supply from the battery.

As shown in FIG. 1, the fuse unit 9 includes a fusible link 29 and a battery terminal 3.

In the fusible link 29, a fuse element (not shown) made of a conductive material provided with a fuse that blows due to an overcurrent is molded by a synthetic resin. An electric wire 31 connected to various devices mounted on the vehicle is electrically connected to the fusible link 29 via a connector (not shown) to supply electric power from the battery to the various devices. At this time, if an overcurrent is input to the fuse element, the fuse blows and the power supply between the battery and various devices is cut off. Such a fusible link 29 is electrically connected to the battery via the battery terminal 3.

The battery terminal 3 is made of a conductive material and includes a device-side connection portion 33 and a battery-side connection portion 35.

The device-side connection portion 33 has a bolt 5 projecting from one end side of the battery terminal 3 and a nut 7 fastened to the bolt 5. In the device-side connection portion 33, a bolt 5 is arranged through a hole provided in the fuse element of the fusible link 29, and the fusible link 29 and the battery terminal 3 are electrically connected. Further, a regular hexagonal nut 7 is fastened to the bolt 5, and the battery terminal 3 is mechanically fixed to the fusible link 29 while the fusible link 29 and the battery terminal 3 are electrically connected to each other.

The battery-side connection portion 35 has a hole through which the battery post can be inserted, and the diameter of the hole is reduced by tightening a bolt inserted at the end. Bolts are tightened in the battery-side connection portion 35 with the battery post inserted through the hole, and the battery terminal 3 is mechanically fixed while being electrically connected to the battery. When the battery-side connection portion 35 is assembled to the battery post, the fusible link 29 is electrically connected to the battery via the battery terminal 3.

Such a fuse unit 9 is covered with a cover 11 in a state of being arranged in the battery, and is protected so as to avoid interference with peripheral members.

As shown in FIGS. 1 to 4, the cover 11 is made of an insulating elastic material such as rubber or synthetic resin, and includes a protective wall 13 and a positioning portion 15.

The protective wall 13 is arranged so as to cover the outer periphery of the fuse unit 9 with the fuse unit 9 arranged in the battery and the cover 11 attached to the fuse unit 9. By arranging the protective wall 13 in this way, it is possible to prevent the fuse unit 9 from interfering with the peripheral members and protect the fuse unit 9.

The outer surface of the protective wall 13 is arranged so as not to come into contact with the battery. Further, the inner surface of the protective wall 13 is arranged so as not to come into contact with the fuse unit 9. By arranging the protective wall 13 in this way, the protective wall 13 does not come into contact with the battery or the fuse unit 9 which may become hot, and the deformation of the protective wall 13 due to the contact with the high temperature portion is prevented. Can be done. A positioning portion 15 is provided on the inner surface of the protective wall 13 facing the bolt 5 and the nut 7.

The positioning portion 15 is a cylinder that is continuous with the protective wall 13 so that the bolt 5 and the nut 7 can be accommodated inside along the axial direction of the bolt 5 from the facing surface facing the bolt 5 and the nut 7 of the protective wall 13. It is extended like a cylinder. When the cover 11 is assembled to the fuse unit 9 along the axial direction of the bolt 5, the bolt 5 is inserted into the positioning portion 15 with the inner peripheral surface and the outer peripheral surface of the bolt 5 separated from each other. Will be done.

Then, with the cover 11 assembled to the fuse unit 9, the inner peripheral surface of the positioning portion 15 is in contact with the outer peripheral surface of the nut 7 to maintain the assembled state of the cover 11 to the fuse unit 9. .. At this time, the fuse unit 9 and the cover 11 are positioned with respect to the plane direction intersecting the axial direction of the bolt 5 due to the contact between the inner peripheral surface of the positioning portion 15 and the outer peripheral surface of the nut 7.

Such a positioning portion 15 includes an inner portion 17 and an outer portion 19. The inner portion 17 includes a circular portion 21 and a plurality of ribs 23.

The circular portion 21 is a member continuous with the protective wall 13 and extends in a cylindrical shape so that the bolt 5 can be accommodated inside along the axial direction of the bolt 5 from the facing surface facing the bolt 5 and the nut 7 of the protective wall 13. Has been done. The circular portion 21 is formed in an annular shape having a perfect circular cross-sectional shape so as to be thinner than the protective wall 13 and elastically deformable toward the outside in the radial direction.

The inner diameter D1 of such a circular portion 21 is set to be smaller than the width L1 between the two parallel sides 25, 25 formed on the outer peripheral surface of the nut 7. Therefore, when the nut 7 is inserted on the inner peripheral side, the circular portion 21 is elastically deformed toward the outer side in the radial direction by the outer peripheral surface of the nut 7. At this time, a restoring force that tries to restore the circular portion 21 inward in the radial direction is generated, and the inner peripheral surface of the circular portion 21 is brought into contact with the outer peripheral surface of the nut 7 so as to be in close contact with the outer peripheral surface of the nut 7.

By setting the inner diameter D1 of the circular portion 21 in this way, the holding force of the circular portion 21 with respect to the nut 7 can be increased, and the cover 11 can be stably held with respect to the fuse unit 9. The inner diameter D1 of the circular portion 21 may be set smaller than the width L2 connecting diagonally, which is the maximum width of the nut 7, and larger than the width L1, but the holding force may be insufficient. It is preferable to set the width smaller than L1.

Further, the inner diameter D1 of the circular portion 21 is set so as to be arranged at a position where the inner peripheral surface of the circular portion 21 is separated from the outer peripheral surface of the bolt 5 in the free state of the circular portion 21. By setting the inner diameter D1 of the circular portion 21 in this way, when the cover 11 is assembled to the fuse unit 9, the circular portion 21 and the bolt 5 do not interfere with each other, and the insertion force can be increased. do not have. The protective wall 13 side from the tip of the bolt 5 of the circular portion 21 is thinner than the protective wall 13, but this portion may be thicker than the protective wall 13 to increase the rigidity of the circular portion 21. In the present embodiment, the protective wall 13 side from the tip of the bolt 5 of the circular portion 21 is thinner than the protective wall 13, the amount of resin is reduced, and the weight is reduced.

Since the cross-sectional shape of such a circular portion 21 is a perfect circle, the inner peripheral surface of the nut 7 is changed to the outer periphery of the nut 7 by the restoring force from the elastic deformation regardless of the position where the corner portion of the nut 7 is arranged. It can be brought into close contact with the surface. Therefore, even if the nut 7 has a pentagonal shape, for example, the inner peripheral surface of the circular portion 21 can be brought into close contact with the outer peripheral surface of the nut 7 and brought into contact with the nut 7, which is affected by the polygonal shape of the nut 7. There is no. A plurality of ribs 23 are formed in the circumferential direction on the outer peripheral surface of such a circular portion 21.

The plurality of ribs 23 are extended by one member continuous with the protective wall 13 along the axial direction of the bolt 5 from the facing surface facing the bolt 5 and the nut 7 of the protective wall 13, respectively. The plurality of ribs 23 are arranged at equal intervals in the circumferential direction of the circular portion 21, are thinner than the protective wall 13 and have a wall thickness equivalent to that of the circular portion 21, and are continuous with the circular portion 21 and the outer portion 19. The member is formed so as to be elastically deformable.

When the nut 7 is inserted into the circular portion 21, such a plurality of ribs 23 are elastically deformed between the circular portion 21 and the outer portion 19 according to the elastic deformation of the circular portion 21. At this time, a restoring force that tries to restore the original shape is generated in the plurality of ribs 23, and the holding force of the circular portion 21 with respect to the nut 7 is increased. The plurality of ribs 23 are arranged at equal intervals with respect to the circumferential direction of the circular portion 21. By arranging the plurality of ribs 23 in this way, the reaction force of each rib 23 becomes equal, and the nut 7 is urged to be arranged at the center of the outer portion 19. The protective wall 13 side from the tips of the bolts 5 of the plurality of ribs 23 is thinner than the protective wall 13, but this portion is made thicker than the protective wall 13, or this portion is filled with resin. Then, the rigidity of the plurality of ribs 23 may be increased. In addition, when the resin is filled, it is not necessary to form the plurality of ribs 23 continuously with the protective wall 13. In the present embodiment, the protective wall 13 side from the tips of the bolts 5 of the plurality of ribs 23 is thinner than the protective wall 13, the amount of resin is reduced, and the weight is reduced.

The inner portion 17 including the elastically deformable circular portion 21 and the plurality of ribs 23 can absorb the difference in size of the nut 7 by the elastic deformation. For example, as shown in FIG. 5, when a nut 7a having a size larger than that of the nut 7 is inserted into the inner portion 17, the circular portion 21 and the plurality of ribs 23 are elastically deformed more than the nut 7.

Then, the inner peripheral surface of the circular portion 21 is brought into close contact with the outer peripheral surface of the nut 7a by the restoring force of the circular portion 21 and the plurality of ribs 23. At this time, the restoring force between the circular portion 21 and the plurality of ribs 23 is increased as compared with the nut 7, and the holding force of the inner portion 17 with respect to the nut 7a is increased. An outer portion 19 is provided on the outer peripheral side of such an inner portion 17.

The outer portion 19 is a cylinder that is continuous with the protective wall 13 so that the bolt 5 and the nut 7 can be accommodated inside along the axial direction of the bolt 5 from the facing surface facing the bolt 5 and the nut 7 of the protective wall 13. It is extended like a cylinder. The outer portion 19 is formed thicker than the protective wall 13, and is set to have a higher rigidity than the inner portion 17 so as not to be elastically deformed when the cover 11 is attached to the fuse unit 9.

The inner diameter D2 of the outer side portion 19 is set to be larger than the width L2 connecting diagonally, which is the maximum width of the nut 7. Therefore, in the outer portion 19, the inner peripheral surface does not come into contact with the outer peripheral surface of the nut 7 while the nut 7 is held by the inner portion 17, and the outer portion 19 is elastically deformed by the nut 7. do not have.

Such an outer portion 19 has rigidity so as not to be elastically deformed when an external force is applied to the cover 11 in a plane direction intersecting the axial direction of the bolt 5 with the cover 11 attached to the fuse unit 9. It has been raised. Therefore, it is possible to prevent the fuse unit 9 and the cover 11 from being displaced due to the elastic deformation of the outer portion 19, and the fuse unit 9 and the cover 11 can be stably positioned.

When a strong external force is applied to the cover 11, the outer portion 19 may be elastically deformed. However, since the bolt 5 and the nut 7 are housed inside the outer portion 19, the outer portion 19 has an outer portion 19. It is possible to prevent large elastic deformation. By accommodating the bolt 5 and the nut 7 inside the outer portion 19 in this way, it is not necessary to unnecessarily increase the wall thickness of the outer portion 19.

The tip 27 of such an outer portion 19 comes into contact with the fuse unit 9 with the cover 11 attached to the fuse unit 9. At this time, the outer portion 19 is set so as not to be elastically deformed in the axial direction of the bolt 5. By bringing the tip 27 of the outer portion 19 having the increased rigidity into contact with the fuse unit 9, the cover 11 can be positioned with respect to the fuse unit 9 in the assembling direction.

In such an assembly 1 of the fuse unit and the cover, the positioning portion 15 is formed so as to be elastically deformable, and has an inner portion 17 that is in contact with the outer periphery of the nut 7. Further, the positioning portion 15 has an outer portion 19 which is integrally formed with the inner portion 17 and the protective wall 13, is arranged apart from the outer periphery of the nut 7, and is set to have a higher rigidity than the inner portion 17.

Therefore, since the inner portion 17 abutting on the outer circumference of the nut 7 is formed so as to be elastically deformable, the difference in size of the nut 7 can be absorbed by the elastic deformation. Further, since the outer portion 19 arranged apart from the outer periphery of the nut 7 has a higher rigidity than the inner portion 17, it does not elastically deform, and the fuse unit 9 and the cover 11 are connected to the shaft of the bolt 5. It can be positioned in a plane direction that intersects the direction.

Therefore, in such an assembly 1 of the fuse unit and the cover, the difference in the size of the nut 7 can be absorbed, and the positioning of the fuse unit 9 and the cover 11 can be stabilized.

Further, the outer portion 19 is formed of one member continuous with the protective wall 13. The inner portion 17 is a member continuous with the outer portion 19 and is formed thinner than the outer portion 19. Therefore, it is not necessary to form the inner portion 17 and the outer portion 19 with separate members different from the protective wall 13, and the productivity of the cover 11 can be improved.

Further, the inner portion 17 has a circular portion 21 formed in a circular shape abutting on the nut 7, and a plurality of ribs 23 connecting the circular portion 21 and the outer portion 19. Therefore, no matter where the corner of the nut 7 is arranged in the circular portion 21, the circular portion 21 can come into contact with the nut 7. In addition, the circular portion 21 can be brought into contact with a plurality of types of nuts 7 without being affected by the polygonal shape of the nut 7.

Further, the nut 7 is formed in an even number of regular polygonal shapes. The inner diameter D1 of the circular portion 21 is set smaller than the width L1 between the two parallel sides 25 and 25 of the nut 7. Therefore, the holding force of the circular portion 21 with respect to the nut 7 can be increased, and the fuse unit 9 and the cover 11 can be stably positioned.

Further, the cover 11 is attached to the fuse unit 9 along the axial direction of the bolt 5. Further, the outer side portion 19 extends from the protective wall 13 in a cylindrical shape so as to accommodate the bolt 5 and the nut 7 inside along the assembly direction. The tip 27 of the outer portion 19 in the assembly direction is in contact with the fuse unit 9 with the cover 11 assembled to the fuse unit 9.

Therefore, by abutting the tip 27 of the outer portion 19 having high rigidity in the assembling direction with the fuse unit 9, the cover 11 can be positioned with respect to the fuse unit 9 in the assembling direction.

Although the present embodiment has been described above, the present embodiment is not limited to these, and various modifications can be made within the scope of the gist of the present embodiment.

For example, the outer portion extends in a cylindrical shape along the axial direction of the bolt from the facing surface facing the bolt and nut of the protective wall, but the present invention is not limited to this. For example, a plurality of highly rigid ribs are extended toward the nut from the facing surface facing the outer circumference of the nut on the protective wall. An annular outer portion having high rigidity may be provided at the tip of the plurality of ribs, and an elastically deformable inner portion may be provided on the inner surface of the outer portion.

Further, the inner portion and the outer portion are formed of one member continuous with the protective wall, that is, the same material as the protective wall, but the present invention is not limited to this. For example, the inner portion may be formed of an elastically deformable elastic body material, the outer portion may be formed of a highly rigid high-rigidity material, and the protective wall, the inner portion, and the outer portion may be integrally connected.

Further, the outer portion is formed in a cylindrical shape, but is not limited to this, and may have any shape such as a square cylinder shape. Also, the inner diameter of the outer portion may be set larger than the diagonal width of the maximum size nut that will be used. Further, the inner diameter of the inner circular portion may be set smaller than the width between the two parallel sides of the smallest size nut that will be used.

Further, although the bolt is provided at the battery terminal, the bolt is not limited to this, and the bolt may be provided at the fuse unit.

1 Fuse unit and cover assembly 3 Battery terminal 5 Bolt 7 Nut 9 Fuse unit 11 Cover 13 Protective wall 15 Positioning part 17 Inner part 19 Outer part 21 Circular part 23 Rib 25 Parallel side 27 Tip D1 Circular part inner diameter L1 Width between two parallel sides

Claims (5)

A fuse unit having a battery terminal, a bolt electrically connected to the battery terminal, and a polygonal nut fastened to the bolt to fix the battery terminal.
A cover that is attached to the fuse unit and covers the outer circumference of the fuse unit,
Equipped with
The cover has a protective wall arranged on the outer periphery of the nut, and extends from the protective wall toward the nut, abuts on the outer periphery of the nut, and brings the fuse unit and the cover to the shaft of the bolt. A positioning unit for positioning in the plane direction intersecting the direction is provided.
The positioning portion is formed so as to be elastically deformable, and is integrally formed with an inner portion that is in contact with the outer periphery of the nut, the inner portion, and the protective wall, and is arranged apart from the outer circumference of the nut. An assembly of a fuse unit and a cover having an outer portion set to have higher rigidity than the inner portion. The outer portion is formed of a member continuous with the protective wall.
The assembly of a fuse unit and a cover according to claim 1, wherein the inner portion is a member continuous with the outer portion and is formed thinner than the outer portion. The fuse unit according to claim 1 or 2, wherein the inner portion has a circular portion formed in a circular shape abutting on the nut, and a plurality of ribs connecting the circular portion and the outer portion. Cover assembly. The nut is formed into an even number of regular polygons and has an even number of regular polygons.
The fuse unit and cover assembly according to claim 3, wherein the inner diameter of the circular portion is set to be smaller than the width between the two parallel sides of the nut. The cover is attached to the fuse unit along the axial direction of the bolt.
The outer portion is extended in a cylindrical shape from the protective wall along the assembly direction so as to accommodate the bolt and the nut.
The tip of the outer portion in the assembling direction is the fuse unit according to any one of claims 1 to 4, which is in contact with the fuse unit in a state where the cover is attached to the fuse unit. Cover assembly.

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