JP7405692B2 - Excess length absorption mechanism - Google Patents

Description

The present invention relates to an extra length absorption mechanism used in a power supply device for a movable body.

This type of surplus length absorption mechanism is disclosed in Patent Document 1. This extra length absorption mechanism consists of a rotating body that is rotatably supported in a case, a flat electric wire that is wound around the rotating body in a wire housing part of the case, and a flat electric wire that is wound around the rotating body in a spring housing part of the case. It includes a spring that biases in the removal direction and an inclined pressing part that restricts the inclination of the rotating body. The upper opening of this case is covered with a cover.

JP 2019-129592 Publication

However, in the conventional excess length absorption mechanism, when the flat electric wire is pulled out from the case, the rotating body rotates at an angle between the case and the cover, so the rotating body comes into contact with the cover and the case, worsening sliding properties. Not only that, the rotating body also causes uneven wear. Furthermore, due to the tilting of the rotating body, there is a possibility that the flat electric wire may also come into contact with the cover and be scraped. Furthermore, since the rotating body is held down only by the cover, when the cover is removed, there is a risk that the rotating body will pop out of the case due to the biasing force of the spring fixed to the rotating body. Furthermore, since the inclined holding part is installed on the side surface of the case, the protruding portion of the inclined holding part becomes a cause of interference with the flat electric wire and wear.

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 extra length absorbing mechanism that can rotate a rotating body without tilting and can easily and reliably prevent damage and wear on flat electric wires.

An extra length absorption mechanism according to an aspect of the present invention is an extra length absorption mechanism for winding an extra length portion of a flat electric wire, and includes a case having an electric wire storage space and a spring storage space in which the flat electric wire is stored. , a central axis whose outer peripheral surface is a winding surface of the flat electric wire; a rotating body disposed on the outer periphery of the central axis and supported rotatably about the central axis; and a rotating body in the spring storage space. a spring that biases the body in the winding direction of the flat electric wire; the case is provided with a center shaft fitting portion into which the center shaft is fitted; a locking part that fits into the fitting part; a small diameter part into which a center hole formed in the rotating body is inserted and rotatably supports the rotating body; and a rotation part that rotates the rotating body without tilting. A body holding part is provided.

The case includes a lower case and an upper case that forms the electric wire storage space and the spring storage space between the lower case, and the center shaft fitting portion is provided in a cylindrical shape at the bottom of the lower case. The spring storage space is formed around the cylindrical center shaft fitting portion between the bottom of the lower case and the lower surface of the rotating body, and the spring storage space is formed between the bottom of the lower case and the lower surface of the rotating body. It is preferable that the electric wire storage space is formed around the central axis between the electric wires.

An engaging portion is formed in a key shape on the upper surface of the cylindrical central shaft fitting portion, and the locking portion that is fitted into the key-shaped engaging portion is formed on the lower surface of the small diameter portion of the central shaft. A large diameter portion having a larger diameter than the center hole of the rotating body is integrally formed on the upper part of the small diameter portion of the central shaft, and a lower surface of the large diameter portion serves as the rotating body holding portion. Preferably.

The rotating body has a plurality of rollers spaced apart in a circumferential direction around the central axis, and the central axis has a slit that curves in a winding direction of the flat electric wire, The flat electric wire pulled out to one side is fixed to the slit of the central shaft, and the flat electric wire pulled out to the other side is guided to the outside through a path between the adjacent rollers, and the flat electric wire is preferably wound around both an inner circumferential region between the central axis and the plurality of rollers, and an outer circumferential region of the plurality of rollers.

A spiral spring is used as the spring, a spring retaining groove is formed on the outer peripheral surface of the cylindrical center shaft fitting part, a spring retaining protrusion is formed on the lower surface of the rotating body, and the spiral It is preferable that an inner circumferential end of the spring is latched to the spring latching groove of the center shaft fitting portion, and an outer periphery of the spiral spring is latched to the spring latching protrusion of the rotating body.

According to the present invention, by holding the rotating body with the rotating body holding part of the central shaft, the rotating body can be rotated without tilting, and an extra length absorption mechanism is provided that easily and reliably prevents damage and wear of the flat electric wire. can be provided.

FIG. 2 is an exploded perspective view showing an example of a surplus length absorption mechanism according to an embodiment of the present invention. It is a sectional view of the above-mentioned surplus length absorption mechanism. (a), (b), and (c) are each schematic diagram showing each process of winding up a flat electric wire, and thereby explaining absorption of extra length of the flat electric wire.

Hereinafter, an extra length absorption mechanism according to an embodiment of the present invention will be described in detail using the drawings.

FIG. 1 is an exploded perspective view showing an example of a surplus length absorption mechanism according to an embodiment of the present invention. FIG. 2 is a sectional view of the extra length absorption mechanism. FIGS. 3A, 3B, and 3C are schematic diagrams illustrating each process of winding a flat electric wire, thereby explaining absorption of excess length of the flat electric wire.

As shown in FIGS. 1 and 2, the extra length absorption mechanism 1 winds up the extra length of the flat electric wire W, and includes a resin case 10 and a resin rotating body housed in the case 10. 30, and a metal spiral spring (spring) 40 which is a biasing means disposed within the case 10.

As shown in FIG. 2, the case 10 is a substantially J-shaped box in plan view, in which a lower case 11 having a bottom portion 11a and a peripheral wall portion 11b and an upper case 18 having a ceiling portion 18a and a peripheral wall portion 18b are assembled together. It is shaped like this. As shown in FIG. 1, in the center of the large-diameter circular portion of the bottom portion 11a of the lower case 11, a central shaft fitting portion 12, into which a separate resin-made central shaft 20 is fitted, is integrally formed in a cylindrical shape and protrudes. has been done. As shown in FIG. 2, a wire storage space P in which flat wires W are stored is located around the central axis 20 between the ceiling portion 18a and peripheral wall portion 18b of the upper case 18 and the upper surface 30a of the rotating body 30. is formed. Furthermore, a spring storage space S in which the spiral spring 40 is stored is formed around the cylindrical center shaft fitting part 12 between the bottom part 11a and the peripheral wall part 11b of the lower case 11 and the lower surface 30b of the rotating body 30. ing.

As shown in FIGS. 1 and 2, a pair of engagement recesses (engagement portions) 13 each having a key-shaped cross section and an arc-shaped plane are formed on the upper surface 12a of the cylindrical center shaft fitting portion 12. As shown in FIGS. Further, a spring retaining groove 14 is formed on the outer circumferential surface 12b of the cylindrical central shaft fitting portion 12.

As shown in FIG. 2, the lower end of the peripheral wall 18b of the upper case 18 is fitted into the recess 11c formed on the upper surface of the bottom 11a of the lower case 11. An outer peripheral portion 30c of the rotating body 30 is rotatably supported on the upper surface 11d inside the recess 11c of the bottom portion 11a. Furthermore, a plurality of frame-shaped lock portions 11e are provided on the peripheral wall portion 11b of the lower case 11 at predetermined intervals.

Further, a support shaft 15 is integrally formed in the center of a small-diameter circular concave portion of the bottom portion 11a of the lower case 11 so as to protrude therefrom. A direction changing roller 16 that changes the drawing direction of the flat electric wire W is rotatably supported on this support shaft 15. The flat electric wire W whose direction has been changed into a U-shape by the direction changing roller 16 is inserted into and taken out from a first electric wire port 11g formed in the peripheral wall portion 11b of the lower case 11.

At a position facing each frame-shaped lock part 11e on the peripheral wall part 18b of the upper case 18, a lock pawl 18e that is engaged with and released from each frame-shaped lock part 11e is provided. A locking mechanism is constituted by these frame-shaped locking portions 11e and locking claws 18e. Further, a first wire port 18g through which the flat wire W is inserted and removed is provided at a position of the peripheral wall portion 18b of the upper case 18 facing the first wire port 11g of the lower case 11. Further, a second wire port 18h is provided at a position 180° apart from the peripheral wall portion 18b of the upper case 18, from which a flat wire W connected to a fixed portion (one side) of a vehicle body (not shown) is pulled out. There is.

The central shaft 20 has a cylindrical large diameter part 21 located above the lower end and a cylindrical small diameter part 22 located at the lower end and smaller in diameter than the large diameter part 21 . The outer circumferential surface 21a of the large diameter portion 21 serves as a winding surface for the flat electric wire W.

The large diameter portion 21 has a larger diameter than the center hole 31 of the rotating body 30 and is formed above the small diameter portion 22 . This large diameter portion 21 is provided with a slit 23 . This slit 23 is open to the outer circumferential surface 21a of the large diameter portion 21. Further, the opening portion of the slit 23 on the outer circumferential surface 21a of the large diameter portion 21 is curved toward the winding direction. The flat electric wire W drawn out to one side is fixed to the slit 23 of the large diameter portion 21, and is drawn out to the outside through the second wire port 18h. Further, the lower surface 21b of the large diameter portion 21 serves as a rotating body holding portion that rotates the rotating body 30 without tilting.

The small diameter portion 22 has a smaller diameter than the center hole 31 formed in the rotating body 30, and supports the rotating body 30 in a freely rotatable manner. A pair of L-shaped locking protrusions (locking portions) 24, 24 are formed on the lower surface 22b of the small diameter portion 22, and are fitted into the pair of engagement recesses 13, 13 of the central shaft fitting portion 12. ing. That is, the pair of locking protrusions 24, 24 of the small diameter portion 22 are inserted into the wide portions of the pair of engagement recesses 13, 13 of the central shaft fitting portion 12, and moved along each arc-shaped engagement recess 13. As a result, the center shaft 20 is fitted into the center shaft fitting portion 12 while being prevented from coming off.

The rotating body 30 is formed into a disk shape, and a circular center hole 31 is formed in the center thereof. Further, the rotating body 30 is disposed on the outer periphery of the small diameter portion 22 of the central shaft 20 and is rotatably supported around the small diameter portion 22 . Furthermore, the upper surface 30a of the rotating body 30 has a plurality of rollers 33 that rotate via respective support shafts 32 arranged at intervals in the circumferential direction around the large diameter portion 21 of the central shaft 20. There is. A flat electric wire W drawn out to the movable body side (the other side) such as a sunroof (not shown) is guided to the outside through a path between adjacent rollers 33. That is, the flat electric wire W is wound around both the inner peripheral region between the large diameter portion 21 of the central shaft 20 and the plurality of rollers 33 and the outer peripheral region of the plurality of rollers 33. Further, a spring locking protrusion 34 is formed on the lower surface 30b of the rotating body 30.

The spiral spring 40 biases the rotating body 30 in the winding direction of the flat electric wire W in the spring storage space S. Further, the inner circumferential end 41 of the spiral spring 40 is hooked to the spring hooking groove 14 of the center shaft fitting portion 12 . Further, the outer circumferential end 42 of the spiral spring 40 is hooked to a spring hooking protrusion 34 on the lower surface 30b of the rotating body 30.

Note that the extra length absorption mechanism 1 is suitable for use in a power supply device for a movable body that supplies power from one side of a fixed part such as a vehicle body to the other side of a movable body such as a sunroof or a sliding seat.

According to the surplus length absorbing mechanism 1 of the above embodiment, when the movable body side moves in the direction of pulling out the flat electric wire W in the state shown in FIG. 30 rotates, the state shown in FIG. 3(b) is changed to the state shown in FIG. 3(c), and the flat electric wire W is pulled out. Furthermore, when the movable body moves in the direction of winding up the flat electric wire W in the position shown in FIG. 3(c), the rotating body 30 rotates due to the spring force of the spiral spring 40, and the state shown in FIG. 3(b) is reached. , the flat electric wire W is rewound in the state shown in FIG. 3(a).

At this time, as shown in FIG. 2, since the lower surface 30b of the rotating body 30 is pressed by the lower surface 21b of the large diameter portion 21 of the central shaft 20, the rotating body 30 can be rotated without tilting. In addition, the wire storage space P formed around the central axis 20 between the ceiling portion 18a and peripheral wall portion 18b of the upper case 18 and the upper surface 30a of the rotating body 30 has no inwardly protruding portion, and therefore is flat. Damage and abrasion of the electric wire W can be easily and reliably prevented.

Furthermore, since the spiral spring 40 is disposed on the lower surface 30b side of the rotating body 30 pressed by the lower surface 21b of the large diameter portion 21, even when the upper case 18 is not assembled properly, the rotating body 30 and the rotating body 30 from the lower case 11 and It is possible to easily prevent the spiral spring 40 from popping out. Therefore, safe assembly work is possible.

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

1 Excess length absorption mechanism 10 Case 11 Lower case 11a Bottom part 12 Center shaft fitting part 12a Top surface 12b Outer peripheral surface 14 Spring retaining groove 18 Upper case 20 Center shaft 21 Large diameter part 21a Outer peripheral surface (winding surface of flat electric wire)
21b Bottom surface (rotating body holding part)
22 Small diameter part 22b Bottom surface 23 Slit 24 Locking projection (locking part)
30 Rotating body 30a Upper surface 30b Lower surface 31 Center hole 33 Roller 34 Spring latching projection 40 Spiral spring (spring)
41 Inner peripheral end 42 Outer peripheral end W Flat electric wire P Electric wire storage space S Spring storage space

Claims (5)

An extra length absorption mechanism for winding the extra length of a flat electric wire,
a case having an electric wire storage space and a spring storage space in which the flat electric wire is stored;
a central shaft whose outer peripheral surface is a winding surface for the flat electric wire;
a rotating body disposed on the outer periphery of the central axis and supported rotatably about the central axis;
a spring that biases the rotating body in the winding direction of the flat electric wire in the spring storage space;
Equipped with
The case is provided with a central shaft fitting part into which the central shaft is fitted,
The center shaft includes a locking portion that is fitted into the center shaft fitting portion, a small diameter portion into which a center hole formed in the rotating body is inserted, and in which the rotating body is rotatably supported; An extra length absorption mechanism that is equipped with a rotating body holding part that rotates the rotating body without tilting. The case includes a lower case and an upper case forming the electric wire storage space and the spring storage space between the lower case and the lower case.
The center shaft fitting portion is provided in a cylindrical shape at the bottom of the lower case,
The spring storage space is formed around the cylindrical center shaft fitting portion between the bottom of the lower case and the lower surface of the rotating body,
The extra length absorption mechanism according to claim 1, wherein the electric wire storage space is formed around the central axis between the ceiling of the upper case and the upper surface of the rotating body. An engaging portion is formed in a key shape on the upper surface of the cylindrical center shaft fitting portion,
The locking portion that fits into the key-shaped engaging portion is formed on the lower surface of the small diameter portion of the central shaft,
2. A large diameter portion larger in diameter than the center hole of the rotating body is integrally formed above the small diameter portion of the central shaft, and a lower surface of the large diameter portion serves as the rotating body holding portion. Excess length absorption mechanism described in . The rotating body has a plurality of rollers spaced apart in a circumferential direction around the central axis,
A slit that curves toward the winding direction of the flat electric wire is formed in the central axis,
The flat electric wire pulled out to one side is fixed to the slit of the central shaft,
The flat electric wire pulled out to the other side is guided to the outside via a path between the adjacent rollers,
The extra wire according to any one of claims 1 to 3, wherein the flat electric wire is wound around both an inner circumferential area between the central axis and the plurality of rollers and an outer circumferential area of the plurality of rollers. Long absorption mechanism. A spiral spring is used as the spring,
A spring catch groove is formed on the outer circumferential surface of the cylindrical center shaft fitting part,
A spring latching protrusion is formed on the lower surface of the rotating body,
an inner circumferential end of the spiral spring is hooked to the spring hook groove of the central shaft fitting portion;
The extra length absorption mechanism according to claim 2 or 3 , wherein an outer peripheral end of the spiral spring is hooked to the spring hooking protrusion of the rotating body.

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