Waterproofing structure and waterproofing method for shielded cable
A waterproofing structure for shielded cable includes: a shielded cable including one or more cables and a braided wire serving as a shielding member and covering the cables; a grommet serving as a waterproofing member and covering a waterproofed portion on the braided wire; and a heat shrinkable tube including an adhesive disposed to cover the waterproofed portion of the braided wire 13 . The adhesive pushed into the braided wire by heat shrinkage of the heat shrinkable tube fills a gap between a plurality of strands of the braided wire in an entire region of the waterproofed portion and a gap between the cable and the braided wire. A space between an outer circumferential surface of the heat shrinkable tube and a part of an inner circumferential surface of the waterproofing member is blocked without any gap in a circumferential direction.
1. A shielded-cable waterproofing structure, comprising:
a shielded cable including one or more cables and a braided wire serving as a shielding member and covering the cables;
a waterproofing member covering a waterproofed portion of the braided wire; and
a heat shrinkable tube including a waterproofing filler disposed to cover the waterproofed portion of the braided wire, wherein
the waterproofing filler pushed into the braided wire by heat shrinkage of the heat shrinkable tube fills gaps between a plurality of strands of the braided wire in a region of the waterproofed portion and an entire region of a gap between an inner circumferential surface of the heat shrinkable tube facing the braided wire and an outer circumferential surface of the cables, and
a space between an outer circumferential surface of the heat shrinkable tube and a part of an inner circumferential surface of the waterproofing member is blocked without any gap in a circumferential direction along a majority of the length of the heat shrinkable tube.
2. The shielded-cable waterproofing structure according to claim 1 , wherein
the braided wire collectively covers the cables, and
a gap between the cables is filled with the waterproofing filler.
3. The shielded-cable waterproofing structure according to claim 1 , wherein the shielded cable has a sheathless structure in which an outside of the braided wire is not covered with an insulating sheath.
4. The shielded-cable waterproofing structure according to claim 2 , wherein the waterproofing filler permeates and fills a gap between the plurality of cables through a widened gap between strands of the braided wire.
5. The shielded-cable waterproofing structure according to claim 2 , wherein a gap between the plurality of cables is filled with a bar-shaped thermoplastic resin serving as the waterproofing filler.
6. A shielded-cable waterproofing method, comprising:
when covering a waterproofed portion of a shielded cable including one or more cables and a braided wire serving as a shielding member and covering the cables, with a waterproofing member;
covering the braided wire in the waterproofed portion on the shielded cable with a heat shrinkable tube including a waterproofing filler;
filling gaps between a plurality of strands of the braided wire in a region of the waterproofed portion and an entire region of a gap between an inner circumferential surface of the heat shrinkable tube facing the braided wire and an outer circumferential surface of the cables with the waterproofing filler by pushing the waterproofing filler into the braided wire by heating the heat shrinkable tube to shrink; and
bringing an outer surface of the heat shrinkable tube in the waterproofed portion filled with the waterproofing filler into close contact with a part of an inner surface of the waterproofing member without any gap in a circumferential direction along a majority of the length of the heat shrinkable tube.
7. The shielded-cable waterproofing method according to claim 6 , further comprising:
collectively covering the cables with the braided wire, and
filling a gap between the cables with the waterproofing filler permeating through a widened gap between strands of the braided wire.