JP7458071B2 - Vibration prevention structure of curtain unit - Google Patents

Description

The present invention relates to a vibration prevention structure for a curtain unit that can be attached to a case constituting a vehicle sunshade device. This invention relates to a vibration prevention structure that prevents vibration noise inside the vehicle.

As a curtain unit used in a conventional vehicle sunshade device, there is one described in Patent Document 1 previously published by the present applicant.

The curtain unit includes a cylindrical winding shaft, a curtain wound around the winding shaft, a biasing member that biases the curtain in the winding direction, a front holder that can be attached to the case and is arranged toward one end of the winding shaft in the axial direction and has a shaft portion, a bush that is attached to the winding shaft at one end of the winding shaft in the axial direction and is rotatably fitted to the outside of the shaft portion to serve as a bearing, a rear holder that can be attached to the case and is attached to the other end of the winding shaft in the axial direction, and a slider that can slide along the axial direction of the winding shaft within the winding shaft and can follow the rotation of the winding shaft, and a coil spring as a biasing member is arranged to bridge the shaft portion and the slider.

In the curtain unit 215 used in the vehicle sunshade device 210, as shown in FIGS. 12 to 14, a winding shaft 260 for winding up the curtain 270 has a bush 240 attached to the front and a rear holder 250 to the rear.

In the curtain unit 215, a bush 240 is inserted into a shaft portion 233 of a front holder 230 attached to the front of the case 220, which is attached to a case 220 attached to a door unit, and a shaft portion extending rearward of the rear holder 250 is attached to the rear of the case 220. It was inserted into a shaft hole 224 provided in the case 220, and was attached to the case 220, so that it could be rotated with respect to the case 220.

A gap of several millimeters was provided between the base of the shaft 233 of the front holder 230 and the bush 240, and between the base of the shaft of the rear holder 250 and the shaft hole 224 at the rear of the case 220, to facilitate assembly and ensure smooth rotation. The former gap was 2 mm, and the latter gap was 3.5 mm, and the finished product was designed to move 5.5 mm forward and backward while driving.

Therefore, in order to prevent the members from hitting each other and causing unpleasant noises, felt washers 245 with a thickness of 1 mm are installed as cushioning parts at the base of the shaft 233 of the front holder 230 and the base of the shaft of the rear holder 250, respectively. I had put it in.

JP 2019-105089 Publication

However, in the above-mentioned vibration prevention structure, felt washers 245 are inserted as buffer parts in each of the root part of the shaft part 233 of the front holder 230 and the root part of the shaft part of the rear holder 250. This resulted in an increase in the number of installation steps.

In view of the above circumstances, it is an object of the present invention to provide a vibration prevention structure that can reduce the number of parts and the number of assembly steps.

The invention according to claim 1 provides a vibration prevention structure for a curtain unit that can be attached to a case constituting a vehicle sunshade device,
The curtain unit is
a cylindrical winding shaft;
a curtain wound around the winding shaft;
a biasing member that biases the curtain in a winding direction;
a mounting holder that is attachable to the case and that is disposed toward one end of the winding shaft in the axial direction and has a shaft portion;
a bush that is fixed to the take-up shaft at one end in the axial direction of the take-up shaft and is rotatably fitted to the outside of the shaft portion and serves as a bearing;
a slider within the take-up shaft that can follow the rotation of the take-up shaft;
Equipped with
The winding shaft has a plurality of wave-shaped grooves formed on its inner peripheral surface, and is rotatably attachable to the case at the other end in the axial direction of the winding shaft,
The biasing member is disposed so as to bridge the shaft portion and the slider,
The shaft portion is provided with an engagement portion formed as an annular bottomed groove extending from the outer circumferential surface of the shaft portion toward the axis of the shaft portion,
The bush is provided with a fitting part that can fit into the inner circumferential surface of the winding shaft, and an engaged part that includes a protrusion that can be engaged with the engaging part,
The fitting portion is provided with a rib that is formed on the outer circumferential surface of the bush along the axial direction of the bush and that can fit into the wavy groove,
The engaged portion includes a plurality of arm portions extending from the rib along the axial direction of the bush, and a tip portion of the arm portion that protrudes toward the axis of the bush and engages with the engaging portion. a possible protrusion;
In the assembled state,
The engaging portion and the engaged portion are engaged, and the bush is restricted from moving in the axial direction of the shaft portion,
and,
The inner circumferential surface of the winding shaft is in contact with the outer circumferential surface of the fitting portion and the outer circumferential surface of the engaged portion.

According to this, when the engaging part and the engaged part are engaged, the bushing is restricted from moving in the axial direction of the shaft part, and at one end of the winding shaft, the bushing is attached to the shaft of the mounting holder. At the other end of the winding shaft, the base of the shaft of the rear holder does not come into contact with the periphery of the shaft hole of the case, so that unpleasant noises are no longer generated during running.

Furthermore, the inner circumferential surface of the winding shaft and the outer circumferential surface of the engaged part are prevented from expanding radially outward, and the engagement part and the engaged part are prevented from expanding outward in the radial direction. Disengagement can be prevented.

Therefore, since the felt washer can be eliminated, it is possible to reduce the number of parts and the number of assembly steps, thereby making it possible to reduce costs. Furthermore, if the engaged portion has the above structure, the cost of the molding die for the bushing will not increase by a relatively large amount, and the number of parts and assembly man-hours can be reduced.

Further, the curtain is attached so as to straddle the bush and the winding shaft,
A bearing portion into which the other end of the winding shaft in the axial direction can be inserted is formed in the case,
The other end of the winding shaft in the axial direction is inserted into the bearing portion.

According to this, a curtain is pasted across the bush and the winding shaft, and the bushing stops moving from the shaft, and the winding shaft also stops moving, so the winding shaft is attached to the bearing part. By adopting a configuration in which the other end in the axial direction is directly inserted, the rear holder can be eliminated. Therefore, the number of parts and assembly man-hours are reduced, contributing to cost reduction.

Further, a guide portion for guiding the engaged portion to the engaging portion is disposed on the shaft portion.

According to this, when inserting the bush into the shaft portion of the mounting holder, the engaged portion is guided to the engaging portion by the guide portion of the shaft portion, so the bush can be fixed at a predetermined position. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle sunshade device including a vibration prevention structure for a curtain unit according to an embodiment of the present invention, seen from the front left side. FIG. 2 is a partial perspective view of the front portion of the embodiment as viewed from the left front side. It is a partial plan view of the front part of the same embodiment. It is a partial perspective view of the rear part of the same embodiment seen from the left rear side. It is a partial plan view of the rear side part of the same embodiment. 2 is a sectional view taken along the line VI-VI in FIG. 1. FIG. FIG. 2 is an exploded perspective view of the vehicle sunshade device as seen from the front left side. FIG. 3 is a partial plan view of the rear portion of the case. 9 is a cross-sectional view taken along line IX-IX of FIG. 8. FIG. 3 is a rear view of the case. It is an explanatory view at the time of assembling the vibration prevention structure of a curtain unit. FIG. 2 is a perspective view of a vehicle sunshade device including a conventional curtain unit vibration prevention structure as seen from the front left side. It is an explanatory view at the time of assembling the vibration prevention structure of the conventional curtain unit. FIG. 2 is a partial perspective view of the rear portion of a vehicle sunshade device including a conventional curtain unit vibration prevention structure, viewed from the left rear side.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle sunshade device including a vibration prevention structure for a curtain unit of the present invention will be described based on the drawings. In the following explanation, the arrows in each drawing are assumed to be F for the front, B for the back, R for the right, L for the left, U for the top, and D for the bottom. Further, in FIG. 2, some members are omitted for ease of explanation.

The vehicle sunshade device 10 includes a curtain unit 15 attached to a case 20 with tapping screws 38.

The case 20 is made of synthetic resin, and has a main body part 21, a front support part 22, and a rear support part 23, as shown in FIGS. 1 to 10. The main body portion 21 has an upper exterior portion 21a and an inner cylinder wall portion 21b. The inner cylinder wall portion 21b is formed to have a substantially J-shaped cross section, and is capable of allowing rotation of the winding shaft 60 and winding and unwinding of the curtain 70.

As shown in FIGS. 1 to 3, 6, and 7, a front holder 30 (corresponding to a mounting holder in the claims) can be attached to the front support portion 22. In this embodiment, the front support part 22 is formed with a screw hole 22a that penetrates in the vertical direction and can communicate with the screw hole 31b of the attachment part 31 of the front holder 30. It is said that it can be installed.

As shown in Figures 1, 4, 5, and 7 to 10, the rear support section 23 has a front plate 24 and a rear plate 25 that are gutter-shaped and open at the bottom, and are arranged with a gap between them in the front-to-rear direction.

The front plate 24 and the rear plate 25 each have an upper bearing portion forming portion 24a and an upper bearing portion forming portion 25a on their inner end surfaces.

Between the front plate 24 and the rear plate 25 in the front-rear direction, an annular portion 26 formed in the shape of a gutter with an open upper side is disposed, and the upper end surface of the annular portion 26 forms a lower bearing portion forming portion. 26a.

The area surrounded by the upper bearing part forming part 24a, the upper bearing part forming part 25a, and the lower bearing part forming part 26a becomes a circular space part when viewed from the front and back direction, and the space part is a part of the winding shaft 60. The center of the circle coincides with the axis of the winding shaft 60. A rear end portion of the winding shaft 60 is rotatably inserted into the space.

The upper bearing portion forming portion 24a, the upper bearing portion forming portion 25a, and the lower bearing portion forming portion 26a serve as bearing surfaces that are in contact with the outer peripheral surface of the winding shaft 60.

A slit 27 extending in the left-right direction is provided in a continuous portion between the front plate 24 and the annular portion 26, and the rear plate 25 and the annular portion 26. The slit 27 makes it easier to bend the front plate 24, the rear plate 25, and the annular portion 26, thereby making it easier to insert the rear end of the winding shaft 60.

From the above, the bearing part 28 is constituted by the upper bearing part forming part 24a, the upper bearing part forming part 25a, and the lower bearing part forming part 26a.

As shown in FIGS. 1 to 11, the curtain unit 15 includes a front holder 30 attached to the case 20, a bush 40 attached to the front end side of a winding shaft 60, which will be described later, and is rotatable with respect to the case 20. A winding shaft 60 that is pivotally supported, a curtain 70 that is wrapped around the winding shaft 60 via a double-sided adhesive tape (not shown), and a curtain 70 that is slidable along the axis of the winding shaft 60 within the winding shaft 60; It also includes a slider 80 that can follow the rotation of the winding shaft 60, a coil spring 90 as a biasing member that biases the curtain 70 in the winding direction, and a silencer tube 100 that suppresses vibrations of the coil spring. ing.

The front holder 30 is made of synthetic resin and has an attachment portion 31 and a shaft portion 33, as shown in Figures 1 to 3, 6, 7, and 11.

A screw hole 31b is provided in the bottom wall of the mounting portion 31, penetrating it in the vertical direction.

The front holder 30 can be attached to the front support part 22 by inserting a screw 38 into a screw hole 31b in the attachment part 31 and tightening the screw 38. When attached to the case 20, the shaft portion 33 is formed to extend along the front-rear direction.

An engaging portion 34 is provided on the shaft portion 33 . In this embodiment, the engaging portion 34 is formed as a bottomed groove 34a having a rectangular cross section extending from the outer peripheral surface of the shaft portion 33 toward the axis of the shaft portion 33, and is formed over the entire circumference of the shaft portion 33.

A tapered guide portion 35 is provided on the rear side of the engaging portion 34 . The guide portion 35 facilitates guiding an engaged portion 43, which will be described later, to the engaging portion 34.

A front end of a coil spring 90, which will be described later, is hooked to the rear end of the shaft portion 33.

A cylindrical bush 40 made of synthetic resin and serving as a bearing is fitted on the outside of the shaft portion 33.

The bush 40 is rotatable with respect to the shaft portion 33 of the front holder 30, as shown in FIGS. 1 to 3, FIGS. 6, 7, and 11.

The bush 40 is provided with a fitting portion 41 that is press-fitted into the winding shaft 60 and fitted therein.

As shown in FIGS. 7 and 11, on the outer circumferential surface of the fitting portion 41, along the axial direction of the bush 40 (the front-rear direction in the assembled state), there are also radial grooves arranged at equal intervals when viewed from the axial direction of the bush 40. A plurality of ribs 42 are provided that protrude outward. The rib 42 can be fitted into a wave groove 61 which will be described later.

The bush 40 is provided with an engaged portion 43 that can engage with the engaging portion 34 . In this embodiment, the engaged portion 43 is formed on the outer circumferential surface of the bush 40 along the axial direction of the bush 40, and includes an arm portion 43a extending from the rib 42 and an arm portion 43a extending from the arm portion 43a along the axial direction of the bush 40. It has a protrusion 43b formed in a rectangular parallelepiped shape that protrudes toward the bottom and corresponds to the bottomed groove 34a.

As shown in FIGS. 6 and 7, the winding shaft 60 is made of aluminum and has a cylindrical shape. A plurality of wave-shaped grooves 61 that are rotationally symmetrical along the axial direction of the wind-up shaft 60 are formed on the inner circumferential surface of the wind-up shaft 60, and the wave-shaped grooves 61 are connected to the rib 42 of the bush 40 and the engaged portion 43. , is formed in a shape that can be fitted with. Further, in a state where the silencer tube 100 is assembled as the vehicle sunshade device 10, the fins 103 of the silencer tube 100, which will be described later, can be arranged within the corrugated grooves 61.

A front end portion of the winding shaft 60 is fitted into the fitting portion 41 of the bush 40 and is rotatably attached to the shaft portion 33 of the front holder 30 attached to the case 20. The rear end portion of the winding shaft 60 is inserted into the upper bearing portion forming portion 24a, the upper bearing portion forming portion 25a, and the lower bearing portion forming portion 26a that constitute the bearing portion 28 of the rear support portion 23, and is inserted into the case 20. Rotatably mounted.

As shown in FIGS. 1 and 7, the curtain 70 is made of synthetic resin in the form of a cloth, and is wrapped around the winding shaft 60 and the press-fitted bush 40 via a double-sided adhesive tape (not shown). There is.

A synthetic resin upper wire cover 71 with an upper wire 73 built in is disposed at the top end of the curtain 70. A synthetic resin knob 72 for pulling up the curtain 70 is disposed in the center of the upper wire cover 71 in the front-to-rear direction. The upper wire cover 71 is cut from the top to the bottom end and has two slits 74 that allow the upper wire 73 to be exposed.

The curtain 70 is biased in the winding direction by a coil spring 90, which serves as a biasing member described below.

A slider 80, a coil spring 90, and a silencer tube 100 are arranged inside the winding shaft 60.

As shown in FIG. 7, the slider 80 is formed of synthetic resin into a substantially cylindrical shape, and the outer circumferential surface is provided along the axial direction of the slider 80 (the front-rear direction in the assembled state) and from the axial direction of the slider 80. A fitting portion 81 having a plurality of rotationally symmetrical wave-shaped protrusions that protrudes radially outward when viewed from the outside is disposed. The fitting portion 81 is formed so as to be able to engage with the wave-shaped groove 61 in the winding shaft 60, so that the rotation of the winding shaft 60 can be transmitted to the slider 80.

The coil spring 90 is made of metal, and has a front end connected to the shaft 33 of the front holder 30 and a rear end connected to the front end of the slider 80, as shown in FIGS. 6 and 7.

The silencer tube 100 in the present invention has the same function and action as that in the applicant's previous patent application No. 2017-238437 (JP Patent Publication No. 2019-105089), so we will omit all or part of the explanation and provide a brief explanation.

The silencer tube 100 has a double-tube structure with an inner tube portion and an outer tube portion, and as shown in Figures 2, 6, and 7, multiple fins 103 are arranged on the outside of the outer tube portion.

The silencer tube 100 and the coil spring 90 are formed to have approximately the same length.

As shown in Figures 6 and 7, a silencer tube 100 is disposed between the winding shaft 60 and the coil spring 90. The silencer tube 100 is rotatable relative to the coil spring 90.

The manner in which the vibration prevention structure of the curtain unit 15 is used will be explained.

Apply heat-resistant sliding grease to the shaft portion 33 of the front holder 30, arrange it so that the engaged portion 43 is on the rear side as shown in the top row of FIG. 11, and insert the bush 40 into the shaft portion 33. do. At this time, as shown in the second row from the top in FIG. 11, the protrusion 43b constituting the engaged portion 43 reaches the guide portion 35 while contacting the outer peripheral surface of the shaft portion 33. Since the guide portion 35 is formed in a tapered shape whose diameter increases toward the front side, the arm portion 43a is pushed out as shown in the third row from the top in FIG. 11.

Then, the protrusion 43b enters the bottomed groove 34a, and as shown in the fourth row from the top of Figure 11, the bottomed groove 34a and the protrusion 43b engage with each other. At this time, the bush 40 is rotatable relative to the shaft portion 33, but movement in the forward and backward directions is restricted.

The front end of the coil spring 90 is connected to the shaft portion 33 of the front holder 30, and anti-rust grease is applied to the coil spring 90. A silencer tube 100 is placed over the rear end of the coil spring 90 and connected to the rear end of the coil spring 90 and the front end of the slider 80 . This sub-assembly becomes the retractor unit.

The retractor unit is inserted into the winding shaft 60 and press-fitted until the bush 40 cannot be inserted any further.

At this time, as shown in FIG. 6, the outer circumferential surface of the engaged portion 43 is prevented from expanding outward by coming into contact with the inner circumferential surface of the winding shaft 60, and the engaged portion 43 is prevented from expanding outward. The engagement with the portion 43 is not released.

Using double-sided adhesive tape (not shown), the curtain 70 is arranged and wrapped around the winding shaft 60 and the bush 40. Further, the front holder 30 is rotated and the coil spring 90 is wound until the set torque is reached.

Using a special tool, the curtain 70 is attached to the case 20 in a state where it cannot be unrolled. After inserting the rear end portion of the winding shaft 60 into the upper bearing portion forming portion 24a, the upper bearing portion forming portion 25a, and the lower bearing portion forming portion 26a that constitute the bearing portion 28 of the rear support portion 23, the front support portion 22 is inserted. The curtain unit 15 is fixed by fitting the front holder 30 to the front holder 30 and inserting and fixing the screw hole 22a of the front support part 22 and the screw hole 31b of the mounting part 31 of the front holder 30 with the screw 38 of the tapping screw. , attached to the case 20.

In this state, the vehicle sunshade device 10 is in a completed state in which the curtain 70 can be taken in and out.

At this time, the bush 40 is in a state where it can rotate relative to the shaft part 33, and the engaging part 34 and the engaged part 43 are in an engaged state, so that the bush 40 is in a state where it can rotate in the front-rear direction (the axis of the shaft part 33 direction), the bushing 40 does not hit the base of the shaft portion 33 of the front holder 30, and the winding shaft 60 is inserted into the bearing portion 28 and becomes a sliding pair. The unpleasant noise will no longer occur.

In the vibration prevention structure of the curtain unit having the above configuration, the vibration prevention structure of the curtain unit 15 that can be attached to the case 20 that constitutes the vehicle sunshade device 10 includes:
The curtain unit 15 is
a cylindrical winding shaft 60;
a curtain 70 wound around a winding shaft 60;
a coil spring 90 as a biasing member that biases the curtain 70 in the winding direction;
a front holder 30 as an attachment holder that can be attached to the case 20, is disposed toward one end in the axial direction of the winding shaft 60, and has a shaft portion 33;
A bush 40 that is fixed to the take-up shaft 60 at one end in the axial direction of the take-up shaft 60 and is rotatably fitted to the outside of the shaft portion 33 and serves as a bearing;
a slider 80 within the winding shaft 60 that can follow the rotation of the winding shaft 60;
Equipped with
The winding shaft 60 can be rotatably attached to the case 20 at the other end in the axial direction,
The coil spring 90 is arranged so as to bridge the shaft portion 33 and the slider 80,
The shaft portion 33 is provided with an engaging portion 34 formed as an annular bottomed groove 34a extending from the outer circumferential surface of the shaft portion 33 toward the axis of the shaft portion 33,
The bush 40 is provided with an engaged portion 43 having a protruding portion that can be engaged with the engaging portion 34,
In the assembled state,
The engaging portion 34 and the engaged portion 43 are engaged, and the bushing 40 is restricted from moving in the axial direction of the shaft portion 33,
and,
The inner peripheral surface of the winding shaft 60 and the outer peripheral surface of the engaged portion 43 are in contact with each other.

As a result, by engaging the engaging portion 34 and the engaged portion 43, the movement of the bush 40 in the axial direction of the shaft portion 33 is restricted, and at one end of the winding shaft 60, the bush 40 does not come into contact with the base of the shaft portion 33 of the front holder 30, and at the other end of the winding shaft 60, the base of the shaft of the rear holder does not come into contact with the periphery of the shaft hole of the case, so that unpleasant noise is not generated while driving.

Further, the inner circumferential surface of the winding shaft 60 and the outer circumferential surface of the engaged portion 43 are in contact with each other, so that the engaged portion 43 is prevented from expanding radially outward, and the engaged portion 34 and the engaged portion 43 are prevented from expanding outward in the radial direction. Disengagement from the joint portion 43 can be prevented.

Therefore, since the felt washer can be eliminated, it is possible to reduce the number of parts and the number of assembly steps, thereby making it possible to reduce costs.

Further, the curtain 70 is attached so as to straddle the bush 40 and the winding shaft 60,
The case 20 is formed with a bearing portion 28 into which the other end of the winding shaft 60 in the axial direction can be inserted.
The other end of the winding shaft 60 in the axial direction is inserted into the bearing portion 28 .

According to this, the curtain 70 is attached so as to straddle the bush 40 and the winding shaft 60, and as the bush 40 stops moving from the shaft portion 33, the winding shaft 60 also stops moving. The rear holder can be eliminated by directly inserting the other end of the winding shaft 60 in the axial direction into the upper bearing forming portion 24a, the upper bearing forming portion 25a, and the lower bearing forming portion 26a that constitute the portion 28. . Therefore, the number of parts and assembly man-hours are reduced, contributing to cost reduction.

In addition, a plurality of wave-shaped grooves 61 are formed on the inner peripheral surface of the winding shaft 60,
The bush 40 is provided with a fitting portion 41 that can be fitted to the inner peripheral surface of the winding shaft 60.
The fitting portion 41 is provided with a rib 42 that is formed on the outer peripheral surface of the bush 40 along the axial direction of the bush 40 and can be fitted into the corrugated groove 61.
The engaged portion 43 has a plurality of arm portions 43a extending from the rib 42 along the axial direction of the bushing 40, and protrusions 43b protruding from the tips of the arm portions 43a toward the axial direction of the bushing 40 and engageable with the engaging portion 34.
In the assembled state, the inner peripheral surface of the winding shaft 60 and the outer peripheral surface of the fitting portion 41 abut against each other.

If the engaged portion 43 has the above configuration, the cost of the mold for forming the bush 40 will not increase relatively significantly, and the number of parts and assembly man-hours can be reduced.

Further, the shaft portion 33 is provided with a guide portion 35 that guides the engaged portion 43 to the engaging portion 34 .

According to this, when inserting the bush 40 into the shaft portion 33 of the front holder 30, the engaged portion 43 is guided to the engaging portion 34 by the guide portion 35 of the shaft portion 33, so that the bush 40 cannot be fixed. It can be fixed in any position.

The vibration prevention structure of the curtain unit of the present invention is not limited to the above configuration. That is, various design changes are possible without departing from the gist of the present invention.

for example,
Further, the other end of the winding shaft 60 can be attached to the case 20 via a rear holder.

Further, the rear end of the winding shaft 60 is attached to the case 20 by a mounting holder similar to the front holder 30, and the front end of the winding shaft 60 is attached to the upper bearing forming part 24a, the upper bearing forming part 25a, and the lower bearing. It is also possible to provide the same configuration as the part forming part 26a and attach it to the case 20.

10 Vehicle sunshade device 15 Curtain unit 20 Case 28 Bearing part 30 Front holder 31 Mounting part 33 Shaft part 34 Engagement part 34a Bottomed groove 35 Guide part 40 Bush 41 Fitting part 42 Rib 43 Engaged part 43a Arm part 43b Projection 60 Winding shaft 61 Wave groove 70 Curtain 80 Slider 90 Coil spring

Claims (3)

A vibration prevention structure for a curtain unit that can be attached to a case constituting a vehicle sunshade device,
The curtain unit is
a cylindrical winding shaft;
a curtain wound around the winding shaft;
a biasing member that biases the curtain in a winding direction;
a mounting holder that is attachable to the case and that is disposed toward one end of the winding shaft in the axial direction and has a shaft portion;
a bush that is fixed to the take-up shaft at one end in the axial direction of the take-up shaft and is rotatably fitted to the outside of the shaft portion and serves as a bearing;
a slider within the take-up shaft that can follow the rotation of the take-up shaft;
Equipped with
The winding shaft has a plurality of wave-shaped grooves formed on its inner circumferential surface, and is rotatably attachable to the case at the other end in the axial direction of the winding shaft,
The biasing member is disposed so as to bridge the shaft portion and the slider,
The shaft portion is provided with an engaging portion formed as an annular bottomed groove extending from the outer circumferential surface of the shaft portion toward the axis of the shaft portion,
The bush is provided with a fitting part that can fit into the inner peripheral surface of the winding shaft, and an engaged part that includes a protruding part that can be engaged with the engaging part,
The fitting portion is provided with a rib that is formed on the outer circumferential surface of the bush along the axial direction of the bush and that can fit into the wavy groove,
The engaged portion includes a plurality of arm portions extending from the rib along the axial direction of the bush, and a tip portion of the arm portion that protrudes toward the axis of the bush and engages with the engaging portion. a possible protrusion;
In the assembled state,
The engaging part and the engaged part are engaged, and the bush is restricted from moving in the axial direction of the shaft part,
and,
A vibration prevention structure for a curtain unit, characterized in that an inner circumferential surface of the winding shaft is in contact with an outer circumferential surface of the fitting part and an outer circumferential surface of the engaged part . The curtain is attached so as to straddle the bush and the winding shaft,
The case is formed with a bearing portion into which the other end of the winding shaft in the axial direction can be inserted,
2. The vibration prevention structure for a curtain unit according to claim 1, wherein the other end side in the axial direction of the winding shaft is inserted into the bearing portion. 3. The vibration prevention structure for a curtain unit according to claim 1 , wherein the shaft portion is provided with a guide portion that guides the engaged portion to the engaging portion.

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