Storage unit and wound body
A storage unit includes a wound body made of wound linear material and a storage body that stores the wound body. The wound body includes a first spiral part in which the wound linear material is spirally wound in a first winding direction such that a distance between the wound linear material of the first spiral part and a center of the wound body gradually decreases, a first inversion part, disposed inside the first spiral part, that inverts a winding direction of the wound linear material from the first winding direction to a second winding direction opposite to the first winding direction, and a second spiral part, disposed outside the first inversion part, in which the wound linear material is spirally wound in the second winding direction such that a distance between the wound linear material of the second spiral part and the center gradually increases.
1 . A storage unit comprising:
a wound body made of wound linear material; and
a storage body that stores the wound body, wherein
the wound body includes:
a first spiral part in which the wound linear material is spirally wound in a first winding direction in a plurality of turns such that a distance between the wound linear material of the first spiral part and a center of the wound body gradually decreases with each turn, wherein the first winding direction is either clockwise or counterclockwise;
a first inversion part, disposed inside the first spiral part, that inverts a winding direction of the wound linear material from the first winding direction to a second winding direction opposite to the first winding direction; and
a second spiral part, disposed outside the first inversion part, in which the wound linear material is spirally wound in a plurality of turns in the second winding direction such that a distance between the wound linear material of the second spiral part and the center of the wound body gradually increases with each turn.
2 . The storage unit according to claim 1 , wherein at least a portion of the wound linear material of the second spiral part is disposed in a space between the wound linear material of the first spiral part.
3 . The storage unit according to claim 2 , wherein the wound linear material of the first spiral part is disposed with intervals in a radial direction.
4 . The storage unit according to claim 2 , wherein the wound linear material of the first spiral part contacts the wound linear material of the second spiral part.
5 . The storage unit according to claim 1 , wherein the wound body further includes:
a third spiral part in which the wound linear material from the second spiral part is spirally wound in the second winding direction such that a distance between the wound linear material of the third spiral part and the center of the wound body gradually decreases.
6 . The storage unit according to claim 5 , wherein the wound body further includes:
a second inversion part, disposed inside the third spiral part, that inverts the winding direction of the wound linear material from the second winding direction to the first winding direction; and
a fourth spiral part, disposed outside the second inversion part, in which the wound linear material is spirally wound in the first winding direction such that a distance between the wound linear material of the fourth spiral part and the center of the wound body gradually increases.
7 . The storage unit according to claim 6 , wherein a layer including the first spiral part and the second spiral part is stacked on a layer including the third spiral part and the fourth spiral part.
8 . The storage unit according to claim 7 , wherein the wound linear material in the layer including the first spiral part and the second spiral part contacts the wound linear material in the layer including the third spiral part and the fourth spiral part in a stacking direction.
9 . The storage unit according to claim 6 , wherein layers, each including the first spiral part and the second spiral part, and layers, each including the third spiral part and the fourth spiral part, are stacked alternately and repeatedly.
10 . The storage unit according to claim 6 , wherein the storage body includes an outer periphery holding part that holds an outer periphery of a spirally-wound part including the wound linear material wound outside the first inversion part and the second inversion part.
11 . The storage unit according to claim 10 , wherein the storage body further includes an inner periphery holding part that holds an inner periphery of the spirally-wound part.
12 . The storage unit according to claim 10 , wherein the storage body further includes an inversion holding part that holds the first inversion part and the second inversion part.
13 . The storage unit according to claim 1 , wherein a flexural rigidity with respect to a neutral axis of the wound linear material is smaller than a flexural rigidity with respect to an axis orthogonal to the neutral axis.
14 . A wound body comprising:
a first spiral part in which a wound linear material is spirally wound in a first winding direction in a plurality of turns such that a distance between the wound linear material of the first spiral part and a center of the wound body gradually decreases with each turn, wherein the first direction is either clockwise or counterclockwise;
a first inversion part, disposed inside the first spiral part, that inverts a winding direction of the wound linear material from the first winding direction to a second winding direction opposite to the first winding direction; and
a second spiral part, disposed outside the first inversion part, in which the wound linear material is spirally wound in a plurality of turns in the second wound direction such that a distance between the wound linear material of the second spiral part and the center of the wound body gradually increases with each turn.