Grommet and wire harness
A grommet includes a main body that fits into a through hole penetrating an attachment target in an axial direction to waterproof the through hole and that allows a wiring member to be inserted into an inner portion in the axial direction. The main body includes a plate-shaped portion extending in intersecting directions that intersect the axial direction so as to close at least a portion of the through hole, and a sound insulation wall portion having a sound insulation protrusion that protrudes from the plate-shaped portion in the axial direction so as to be formed in an annular or arc shape centered around a central axis in the axial direction.
1. A grommet comprising:
a main body that fits into a through hole penetrating an attachment target in an axial direction to waterproof the through hole and that allows a wiring member to be inserted into an inner portion in the axial direction, wherein
the main body includes
a plate-shaped portion extending in an intersecting direction to intersect the axial direction so as to close at least a portion of the through hole, and
a sound insulation wall portion having a sound insulation protrusion that protrudes from the plate-shaped portion in the axial direction so as to be formed in an annular or arc shape centered around a central axis in the axial direction, and
the sound insulation protrusion is formed in a rectangular shape having curved corners in a cross-sectional shape along a radial direction orthogonal to the central axis.
2. The grommet according to claim 1 , wherein
the sound insulation protrusion includes:
a first sound insulation protrusion formed on a surface on one side of the plate-shaped portion in the axial direction, and
a second sound insulation protrusion formed on a surface on the other side of the plate-shaped portion in the axial direction, and
each of the first sound insulation protrusion and the second sound insulation protrusion is located to be shifted from each other with respect to the intersecting direction.
3. The grommet according to claim 2 , wherein
each of the first sound insulation protrusion and the second sound insulation protrusion is provided concentrically in plurality at intervals with respect to the intersecting direction,
the sound insulation wall portion has a configuration in which
each of the plurality of first sound insulation protrusions is located to face a gap adjacent to the second sound insulation protrusion across the plate-shaped portion with respect to the axial direction, and
each of the plurality of second sound insulation protrusions is located to face a gap adjacent to the first sound insulation protrusion across the plate-shaped portion with respect to the axial direction.
4. The grommet according to claim 1 , further comprising:
a tubular portion formed in a tubular shape integrally with the main body and through which the wiring member is inserted in the axial direction, wherein
the plate-shaped portion extends outward in the intersecting direction from the tubular portion and is formed in an annular shape centered around the central axis, and
the sound insulation wall portion is expandable and deformable outward in the intersecting direction together with the tubular portion.
5. The grommet according to claim 1 , further comprising:
a tubular portion formed in a tubular shape integrally with the main body and through which the wiring member is inserted in the axial direction, wherein
the plate-shaped portion extends outward in the intersecting direction from the tubular portion and is formed in an annular shape centered around the central axis, and
the sound insulation wall portion is expandable and deformable outward in the intersecting direction together with the tubular portion.
6. The grommet according to claim 3 , further comprising:
a tubular portion formed in a tubular shape integrally with the main body and through which the wiring member is inserted in the axial direction, wherein
the plate-shaped portion extends outward in the intersecting direction from the tubular portion and is formed in an annular shape centered around the central axis, and
the sound insulation wall portion is expandable and deformable outward in the intersecting direction together with the tubular portion.
7. A wire harness comprising:
a wiring member having conductivity; and
a grommet provided on the wiring member, wherein
the grommet includes a main body that fits into a through hole penetrating an attachment target in an axial direction to waterproof the through hole and that allows a wiring member to be inserted into an inner portion in the axial direction,
the main body includes
a plate-shaped portion extending in an intersecting direction to intersect the axial direction so as to close at least a portion of the through hole, and
a sound insulation wall portion having a sound insulation protrusion that protrudes from the plate-shaped portion in the axial direction so as to be formed in an annular or arc shape centered around a central axis in the axial direction, and
the sound insulation protrusion is formed in a rectangular shape having curved corners in a cross-sectional shape along a radial direction orthogonal to the central axis.