Structure to prevent abnormal noise from curtain units

Abstract

To provide an abnormal sound prevention structure of a curtain unit that does not generate abnormal sound from an arm.SOLUTION: In a shank 33, a side face on a tip 36 side in an axial direction of the shank 33 of a bottomed groove 35b is so made as to be a first engagement part 37a, and a step surface connecting a large diameter part 34 and a small diameter part 35 is so made as to be a second engagement part 37b. In a bushing 40, a tip side face of a protrusion 44 is so made as to be a first engaged part 45a which can engage with the first engagement part 37a, and a step surface connecting a large inner diameter part 40a and a small inner diameter part 40b is so made as to be a second engaged part 45b which engages with the second engagement part 37b. In an assembled state, the first engagement part 37a and the first engaged part 45a, and the second engagement part 37a and the second engaged part 45b are engaged, whereby movement of the bushing 40 in the axial direction of the shank 33 is regulated, an arm part 43 is so arranged as to face the bottomed groove 35b, and a gap is provided between the arm part 43 and the shank 33.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a noise prevention structure for preventing the generation of noise when opening and closing a curtain of a vehicle sunshade device. [Background technology]

[0002] A conventional noise prevention structure for a curtain unit used in a vehicle sunshade device is disclosed in Patent Document 1, which was filed earlier by the present applicant.

[0003] In Patent Document 1, the curtain unit comprises 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 is attachable to the case and arranged toward one end side in the axial direction of the winding shaft and has an axle portion, a bush that is fitted onto the winding shaft at one end side in the axial direction of the winding shaft and into which the axle portion is rotatably inserted to serve as a bearing, a rear holder that is attachable to the case and attached to the other end side in the axial direction of the winding shaft, and a slider that is slidable 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 axle portion and the slider.

[0004] In the noise prevention structure for the curtain unit of Patent Document 1, an engaging portion formed as a ring-shaped bottomed groove extending from the outer peripheral surface of the shaft toward the axis of the shaft is provided on the shaft portion of the front holder, and an engaged portion having a protruding portion engageable with the engaging portion is provided at the tip of multiple arm portions extending from the fitting portion on the bush, and when assembled, the engaging portion and the engaged portion engage with each other to restrict movement of the bush in the axial direction of the shaft portion, and the inner peripheral surface of the winding shaft and the outer peripheral surface of the engaged portion including the arm portions abut against each other. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2022-39177 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the above-mentioned noise prevention structure for the curtain unit, when assembled, the arm portion comes into contact with the outer circumferential surface of the shaft portion, which may cause abnormal noise during operation (see Patent Document 1, FIG. 6).

[0007] In view of the above circumstances, an object of the present invention is to provide a noise prevention structure for a curtain unit that does not generate abnormal noise from the arm. [Means for solving the problem]

[0008] The invention described in claim 1 is a structure for preventing abnormal noise of a curtain unit that can be attached to a case constituting a vehicle sunshade device, The curtain unit includes: A cylindrical winding shaft; A curtain wound on the winding shaft; A biasing member that biases the curtain in a winding direction; an attachment holder that can be attached to the case and is disposed on one end side of the winding shaft in the axial direction and has a shaft portion; a bushing that is fitted onto the winding shaft at one end side in the axial direction of the winding shaft, and into which the shaft portion is rotatably inserted to serve as a bearing; a slider that is slidable within the winding shaft along the axial direction of the winding shaft and that can follow the rotation of the winding shaft; Equipped with The other end side of the winding shaft in the axial direction is rotatably attached to the case, The biasing member is disposed so as to bridge the shaft portion and the slider, The shaft portion is The catheter has a large diameter portion disposed on the base end side, a small diameter portion extended from the large diameter portion and formed with a smaller diameter than the large diameter portion, and a tip portion extended from the small diameter portion and formed with a smaller width than the small diameter portion, The small diameter portion An annular bottomed groove is provided from the outer circumferential surface of the shaft portion toward the axis of the shaft portion, A side surface of the bottomed groove on the tip end side in the axial direction of the shaft portion serves as a first engagement portion, A step surface connecting the large diameter portion and the small diameter portion serves as a second engagement portion, The bushing is the inner circumferential surface side has a large inner diameter portion and a small inner diameter portion formed to have a diameter smaller than that of the large inner diameter portion, the outer circumferential surface side has a fitting portion that can be fitted with the inner circumferential surface of the winding shaft, a plurality of arm portions extending from the fitting portion along the axial direction of the bush, and protrusions protruding from the tip ends of the arm portions toward the axis of the bush, A tip side surface of the protrusion serves as a first engaged portion that is engageable with the first engaging portion, a step surface connecting the large inner diameter portion and the small inner diameter portion serves as a second engaged portion engageable with the second engaging portion, In an assembled state, the first engaging portion and the first engaged portion, and the second engaging portion and the second engaged portion are engaged with each other, thereby restricting the movement of the bush in the axial direction of the shaft portion, The arm portion is disposed so as to face the bottomed groove, and a gap is provided between the arm portion and the shaft portion.

[0009] According to this, since the arm portion and the shaft portion do not come into contact with each other, no extra load is placed on the arm portion, and therefore, noise generated from the arm portion can be prevented.

[0010] In the above-described configuration, the diameter of the shaft portion is thicker at the joint between the attachment portion of the mounting holder to the case and the shaft portion, so that the shaft portion is less likely to bend and break.

[0011] Further, a guide portion is disposed on the opposite side of the protrusion from the first engaged portion, the guide portion being formed at an angle with respect to the axis of the bush and guiding the protrusion into the bottomed groove.

[0012] According to this, when fitting the bushing to the shaft, the protrusion at the tip of the arm of the bushing needs to get over the disk-shaped portion of the small diameter end of the shaft and fit into the bottomed groove. Therefore, a guide portion that is inclined with respect to the axis of the bushing is provided on the opposite side of the protrusion from the first engaged portion, allowing the arm to move smoothly while flexing, thereby preventing damage to the protrusion.

[0013] Further, the large diameter portion is provided with an insertion hole penetrating in a direction perpendicular to the axis of the shaft portion, The bush has a plurality of notches arranged on an end surface of the bush that is not fitted onto the winding shaft, the notches being cut out radially from an axis of the bush toward an end surface of the bush that is fitted onto the winding shaft, With the shaft portion inserted into the bush, the insertion hole and the notch are connected, and a lock pin is inserted into the insertion hole and the notch, thereby restricting rotation of the bush and locking rotation of the winding shaft.

[0014] This allows the coil spring, which acts as a biasing member inside the curtain unit, to be kept wound for a long period of time, which is useful when the work of assembling the curtain unit into the case is carried out in a remote location. The bush is structured so that the lock pin is inserted in a direction perpendicular to the axis of the shaft, but the bush has multiple cutouts, which allows the curtain unit to be locked at any rotational position. Furthermore, the mold for manufacturing the bush does not require a slide structure, which helps reduce costs. [Brief description of the drawings]

[0015] [Figure 1] 1 is a perspective view of a vehicle sunshade device equipped with a structure for preventing abnormal noise from a curtain unit according to one embodiment of the present invention, viewed from the left front side. [Diagram 2] FIG. 2 is a partially exploded perspective view of the noise prevention structure of the embodiment, as viewed from the left rear side. [Diagram 3] FIG. 2 is a partial assembled perspective view of the noise prevention structure of the embodiment, seen from the left rear side. [Figure 4] FIG. 4 is a vertical cross-sectional view of FIG. [Diagram 5] This is an explanatory diagram of the assembly of the noise prevention structure for a curtain unit, with the left side being a plan view and the right side being a vertical cross-sectional view. [Figure 6] This is an exploded oblique view of the curtain unit from the left front side. [Figure 7] 11 is an explanatory diagram of a usage mode of the anti-rotation mechanism for the winding shaft of the curtain unit. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] An embodiment of a vehicle sunshade device equipped with a curtain unit noise prevention structure of the present invention will be described with reference to the drawings. In the following description, the arrows in each drawing indicate F, B, R, L, U, and D, respectively.

[0017] As shown in FIG. 1, the vehicle sunshade device 10 is configured by attaching the curtain unit 15 to the case 20 with the screws 38 which are tapping screws.

[0018] The case 20 is made of synthetic resin, and as shown in Figures 1 and 7, has a main body 21, a front support part 22, and a rear support part 23. The main body 21 has an upper exterior part 21a and an inner tube wall part 21b. The inner tube wall part 21b is formed with a generally J-shaped cross section, and enables the rotation of the winding shaft 60 and the winding and unwinding of the curtain 70.

[0019] A front holder 30 (corresponding to the mounting holder in the claims) can be attached to the front support portion 22, as shown in FIGS.

[0020] In this embodiment, the front support portion 22 is provided with a screw hole 22a penetrating in the up-down direction and a reference boss 22b extending in a cylindrical shape in the upward direction, and is capable of communicating with a screw hole 31b of a mounting portion 31 of a front holder 30 described later and the screw hole 22a, and the reference boss 22b is capable of being inserted into an insertion hole 31c of the mounting portion 31 of the front holder 30. The front holder 30 can be attached using a screw 38 by inserting the reference boss 22b into the insertion hole 31c and connecting the screw hole 31b and the screw hole 22a.

[0021] As shown in Figures 1 and 7, the rear support portion 23 has a front plate 24 and a rear plate 25, which are gutter-shaped and open at the bottom, arranged with a gap between them in the front-to-rear direction, and are capable of supporting the rear end of the winding shaft 60.

[0022] As for the rear support portion 23, the function and action are the same as those in the applicant's previous Patent Application No. 2020-144069 (Patent Publication No. 2022-39177), so detailed explanation will be omitted.

[0023] As shown in Figures 1 to 7, the curtain unit 15 comprises a front holder 30 attached to the case 20, a bush 40 attached to the front end of a winding shaft 60 described later, a winding shaft 60 rotatably supported relative to the case 20, a curtain 70 wrapped around the winding shaft 60 via double-sided adhesive tape 75, a slider 80 that is slidable along the axial direction of the winding shaft 60 within the winding shaft 60 and 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, a silencer tube 100 that suppresses vibration of the coil spring, and a lock pin 110.

[0024] The front holder 30 is made of synthetic resin, and has a mounting portion 31 and a shaft portion 33, as shown in FIGS.

[0025] The bottom wall of the attachment portion 31 is provided with a screw hole 31b that penetrates in the vertical direction, and an insertion hole 31c that penetrates in the vertical direction and through which the reference boss 22b can be inserted.

[0026] The front holder 30 can be attached to the front support part 22 by inserting the reference boss 22b into the insertion hole 31c in the attachment part 31 and inserting the screw 38 into the screw hole 31b and screwing it in. When attached to the case 20, the shaft part 33 is formed to extend along the front-rear direction.

[0027] The shaft portion 33 has a large diameter portion 34 arranged on the base end side, a small diameter portion 35 extending rearward from the large diameter portion 34 and formed with a smaller diameter than the large diameter portion 34, and a tip portion 36 extending rearward from the small diameter portion 35 and formed with a smaller width than the small diameter portion 35.

[0028] The large diameter portion 34 has an insertion hole 34a that penetrates in a direction perpendicular to the axis of the shaft portion 33, and allows a lock pin 110 to be inserted therein.

[0029] The small diameter portion 35 has a tip end 36 side from the outer circumferential surface of the small diameter portion 35. Shaft 33 A bottomed groove 35b having a rectangular cross section and an annular shape extending toward the axis of the bearing 35 is disposed therein.

[0030] In this embodiment, the small diameter portion 35 has, from the large diameter portion 34 side to the tip portion 36 side, a sliding portion 35a, a bottomed groove 35b, and a terminal portion 35c. The sliding portion 35a has a cylindrical shape that can slide on a small inner diameter portion 40b (described later) of the bush 40, the bottomed groove 35b is formed to have a cylindrical shape with a thickness that does not allow a protrusion 44 of an arm portion 43 (described later) of the bush 40 to come into contact with it, and the terminal portion 35c is disk-shaped and formed to have the same outer diameter as the sliding portion 35a.

[0031] The tip portion 36 is formed with a locking hole 36a, in which the front end portion of a coil spring 90, which will be described later, is locked.

[0032] The shaft portion 33 is provided with a first engagement portion 37a and a second engagement portion 37b.

[0033] In this embodiment, the side surface of the bottomed groove 35b on the tip portion 36 side is the first engagement portion 37a, in other words, the rear end side surface of the bottomed groove 35b opposite the large diameter portion 34 in the axial direction of the shaft portion 33 is the first engagement portion 37a, and the step surface connecting the large diameter portion 34 and the small diameter portion 35 is the second engagement portion 37b.

[0034] A cylindrical bushing 40 made of synthetic resin is fitted onto the outside of the shaft portion 33 to serve as a bearing.

[0035] The bush 40 is rotatable with respect to the shaft portion 33 of the front holder 30, as shown in FIGS.

[0036] The bushing 40 has a large inner diameter portion 40a and a small inner diameter portion 40b that is formed to have a smaller diameter than the large inner diameter portion 40a.

[0037] The bushing 40 has a fitting portion 41 that can be fitted into the inner peripheral surface of the winding shaft 60. As shown in Figures 2 to 5, a plurality of ribs 42 are arranged on the outer peripheral surface of the fitting portion 41, which extend along the axial direction of the bushing 40 (the front-rear direction when assembled) and protrude radially outward at equal intervals when viewed from the axial direction of the bushing 40. The ribs 42 are capable of being fitted into wave grooves 61 of the winding shaft 60, which will be described later.

[0038] The bushing 40 has a pair of arm portions 43 extending from the fitting portion 41 along the axial direction of the bushing 40, and a protrusion 44 protruding from the tip of the arm portions 43 toward the axis of the bushing 40 and capable of engaging with the first engagement portion 37a.

[0039] On the opposite side of the protrusion 44 from a first engaged portion 45a described later, a guide portion 44a is provided which is formed as an end face inclined with respect to the axis of the bushing 40 and guides the protrusion 44 into the bottomed groove 35b.

[0040] The bushing 40 is provided with a first engaging portion 37a, a second engaging portion 37b, and an engageable first engaged portion 45a and a second engaged portion 45b.

[0041] In this embodiment, the rear side surface of the protrusion 44 serves as a first engaged portion 45a, and the step surface connecting the large inner diameter portion 40a and the small inner diameter portion 40b serves as the second engaged portion 45b.

[0042] The bushing 40 has a plurality of notches 46 arranged on the end face (front end face) on the side not fitted onto the winding shaft 60, at positions radially from the axis of the bushing 40 toward the end face (rear end face) on the side fitted onto the winding shaft 60. In this embodiment, the notches 46 are arranged in 6 pairs at 30 degree intervals in 12 locations.

[0043] With the shaft portion 33 inserted into the bushing 40, and with the insertion hole 34a and the notch 46 connected, a lock pin 110 is inserted into the insertion hole 34a and the notch 46, whereby the winding shaft 60 can be locked so as not to rotate.

[0044] The winding shaft 60 is formed of aluminum in a cylindrical shape as shown in Figures 1 to 4, 6 and 7. A plurality of rotationally symmetric wave grooves 61 are formed on the inner peripheral surface of the winding shaft 60 along the axial direction of the winding shaft 60, and the wave grooves 61 are formed in a shape that can be fitted into the ribs 42 and the arm portions 43 of the bushing 40. In addition, in a state where the vehicle sunshade device 10 is assembled, the fins 103 of the silencer tube 100 described later can be placed in the wave grooves 61.

[0045] The front end of the winding shaft 60 fits 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 front support portion 22 of the case 20. The rear end of the winding shaft 60 is inserted through the front plate 24 and the rear plate 25 of the rear support portion 23 of the case 20, and is rotatably attached to the case 20.

[0046] As shown in Figures 1, 6 and 7, the curtain 70 is made of synthetic resin in a cloth-like form and is wrapped around the winding shaft 60 and the pressed-in bush 40 via double-sided adhesive tape 75.

[0047] An upper wire cover 71 made of synthetic resin with an upper wire 73 built in is disposed at the upper end of the curtain 70. A knob 72 made of synthetic resin for pulling up the curtain 70 is disposed at the center in the front-to-rear direction of the upper wire cover 71. The upper wire cover 71 is cut from the top to the bottom and has two slits 74 that allow the upper wire 73 to be exposed.

[0048] The curtain 70 is biased in the winding direction by a coil spring 90 serving as a biasing member, which will be described later.

[0049] A slider 80, a coil spring 90, and a silencer tube 100 are disposed inside the winding shaft 60.

[0050] 6, the slider 80 is made of synthetic resin and is formed into a generally cylindrical shape, and an engaging portion 81 having a plurality of rotationally symmetric wave-shaped protrusions is disposed on the outer circumferential surface thereof, which extend along the axial direction of the slider 80 (the front-rear direction when assembled) and protrude radially outward as viewed from the axial direction of the slider 80. The engaging portion 81 is formed so as to be able to mesh with the wave-shaped groove 61 in the winding shaft 60, and the rotation of the winding shaft 60 can be transmitted to the slider 80.

[0051] The slider 80 is capable of sliding within the winding shaft 60 along the axial direction of the winding shaft 60 and is capable of following the rotation of the winding shaft 60 .

[0052] The coil spring 90 is made of metal and, as shown in Figures 2 to 4 and 6, its front end is connected to the tip 36 of the shaft portion 33 of the front holder 30 and its rear end is connected to the front end 82 provided on the slider 80.

[0053] 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 detailed description thereof will be omitted.

[0054] The silencer tube 100 has a double-tube structure including an inner tube portion and an outer tube portion, and as shown in FIGS. 2 to 4 and 6, a plurality of fins 103 are disposed on the outside of the outer tube portion.

[0055] The silencer tube 100 and the coil spring 90 are formed to have approximately the same length.

[0056] 2 to 4 and 6, a silencer tube 100 is disposed between the winding shaft 60 and the coil spring 90. The silencer tube 100 is rotatable with respect to the coil spring 90.

[0057] The lock pin 110 is made of metal, is elastically deformable, and is formed in a snap pin shape as shown in FIGS.

[0058] The manner in which the noise prevention structure of the curtain unit 15 is used will now be described.

[0059] Heat-resistant sliding grease is applied to the shaft portion 33 of the front holder 30, and the shaft portion 33 is inserted into the bush 40 with the first engaged portion 45a positioned at the rear as shown in Fig. 2 and Fig. 5(1). At this time, as shown in Fig. 5(2), the protrusion 44 reaches the terminal portion 35c of the small diameter portion 35 while contacting the outer circumferential surface of the shaft portion 33. The guide portion 44a disposed on the opposite side of the protrusion 44 from the first engaged portion 45a is formed so as to be inclined with respect to the axis of the bush 40. Therefore, when the protrusion 44 passes over the terminal portion 35c, the arm portion 43 is easily pushed apart, preventing the protrusion 44 from being damaged.

[0060] Then, as shown in Figure 5 (3), the protrusion 44 climbs over the terminal portion 35c and enters the bottomed groove 35b, and the rear end face of the protrusion 44 engages with the rear end face of the bottomed groove 35b, the step surface connecting the large diameter portion 34 and the small diameter portion 35, and the step surface connecting the large inner diameter portion 40a and the small inner diameter portion 40b.

[0061] In other words, the first engaging portion 37a engages with the first engaged portion 45a, and the second engaging portion 37b engages with the second engaged portion 45b.

[0062] At this time, the bush 40 is rotatable relative to the shaft portion 33, but movement in the front-rear direction is restricted.

[0063] The front end of the coil spring 90 is connected to the engagement hole 36a of the tip portion 36, and anti-rust grease is applied to the coil spring 90. A silencer tube 100 is placed over the rear end side of the coil spring 90, and the rear end of the coil spring 90 is connected to the front end portion 82 of the slider 80.

[0064] The winding mechanism 16 formed by the above steps and configured as the area enclosed by the square in FIG. 6 is inserted onto the winding shaft 60, and the bushing 40 is inserted and fitted as far as it will go.

[0065] At this time, although not shown, the outer peripheral surface of the arm portion 43 abuts against the inner peripheral surface of the winding shaft 60, thereby restricting it from spreading outward, and the engagement between the first engaging portion 37a and the first engaged portion 45a, and the engagement between the second engaging portion 37b and the second engaged portion 45b are not released.

[0066] The curtain 70 is wound around the winding shaft 60 and the bush 40 using the double-sided adhesive tape 75. The front holder 30 is then rotated to wind the coil spring 90 until it reaches the set torque.

[0067] Furthermore, the insertion hole 34a is communicated with the notch 46. Then, with the insertion hole 34a and the notch 46 communicated, a lock pin 110 is inserted into the insertion hole 34a and the notch 46, thereby restricting the rotation of the bush 40 and locking the rotation of the winding shaft 60. Additionally, the knob 72 and the curtain 70 are fixed with an adhesive tape 120 to prevent the curtain 70 of the curtain unit 15 from coming loose.

[0068] As a result of the above, a curtain unit 15 is formed as shown in the top row of Fig. 7. As shown in the second row of Fig. 7, the curtain unit 15 can be boxed and shipped to another factory, where it can be assembled into a case 20.

[0069] In detail, as shown in the third row and enlarged view of Figure 7, after inserting the rear end of the winding shaft 60 into the rear support portion 23, the front holder 30 is fitted into the front support portion 22, the reference boss 22b is inserted into the insertion hole 31c, and the threaded hole 22a of the front support portion 22 and the threaded hole 31b of the mounting portion 31 of the front holder 30 are inserted and fixed with a tapping screw 38, thereby attaching the curtain unit 15 to the case 20.

[0070] 7, the locked state of the curtain unit 15 is released by pulling out the lock pin 110 from the insertion hole 34a and the notch 46. At the same time, the adhesive tape 120 is removed. This completes the vehicle sunshade device 10, allowing the curtain 70 to be put in and taken out.

[0071] At this time, while the bush 40 remains rotatable relative to the shaft portion 33, the first engaging portion 37a and the first engaged portion 45a, and the second engaging portion 37b and the second engaged portion 45b are engaged with each other, restricting the movement of the bush 40 in the fore-and-aft direction (the axial direction of the shaft portion 33). As a result, the bush 40 will not hit the base of the shaft portion 33 of the front holder 30, and therefore no unpleasant noises will be generated while driving.

[0072] The structure for preventing abnormal noise of the curtain unit having the above-mentioned configuration is a structure for preventing abnormal noise of the curtain unit 15 that can be attached to the case 20 constituting the vehicle sunshade device 10, 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 and is disposed on one end side in the axial direction of the winding shaft 60 and has a shaft portion 33; a bushing 40 which is fitted to the winding shaft 60 at one end side in the axial direction of the winding shaft 60 and into which the shaft portion 33 is rotatably inserted to serve as a bearing; a slider 80 that is slidable along the axial direction of the winding shaft 60 within the winding shaft 60 and that can follow the rotation of the winding shaft 60; Equipped with The other end of the winding shaft 60 in the axial direction is rotatably attached to the case 20, The coil spring 90 is disposed so as to bridge the shaft portion 33 and the slider 80. The shaft portion 33 is The catheter has a large diameter portion 34 disposed on the base end side, a small diameter portion 35 extended from the large diameter portion 34 and formed with a smaller diameter than the large diameter portion 34, and a tip portion 36 extended from the small diameter portion 35 and formed with a smaller width than the small diameter portion 35. , small diameter part 35 From the outer circumferential surface of the shaft 33 toward the axis of the shaft 33 Rectangular cross section and Circular was formed in A bottomed groove 35b is provided. A side surface of the bottomed groove 35b on the tip end 36 side in the axial direction of the shaft portion 33 is a first engagement portion 37a, A step surface connecting the large diameter portion 34 and the small diameter portion 35 is a second engagement portion 37b. Bush 40 is The inner peripheral surface side has a large inner diameter portion 40a and a small inner diameter portion 40b formed with a diameter smaller than that of the large inner diameter portion 40a, and the outer peripheral surface side has a fitting portion 41 that can fit with the inner peripheral surface of the winding shaft 60, a plurality of arm portions 43 extending from the fitting portion 41 along the axial direction of the bushing 40, and protrusions 44 protruding from the tip portions of the arm portions 43 toward the axis of the bushing 40, The tip side surface of the protrusion 44 is a first engaged portion 45a that can be engaged with the first engaging portion 37a, A step surface connecting the large inner diameter portion 40a and the small inner diameter portion 40b is a second engaged portion 45b that can be engaged with the second engaging portion 37b, In the assembled state, the first engaging portion 37a and the first engaged portion 45a, and the second engaging portion 37b and the second engaged portion 45b are engaged with each other, thereby restricting the movement of the bush 40 in the axial direction of the shaft portion 33. The arm portion 43 is disposed so as to face the bottomed groove 35b, and is disposed so as to have a gap between the arm portion 43 and the shaft portion 33.

[0073] According to this, the arm portion 43 and the shaft portion 33 do not come into contact with each other, and therefore no extra load is applied to the arm portion 43, so that the generation of abnormal noise from the arm portion 43 can be prevented.

[0074] In the above-described configuration, the diameter of the shaft portion 33 is increased at the joint between the mounting portion 31 of the front holder 30 and the shaft portion 33, so that the shaft portion 33 is less likely to bend and break.

[0075] Further, on the opposite side of the projection 44 to the first engaged portion 45a, a guide portion 44a is provided which is formed inclined with respect to the axis of the bush 40 and guides the projection 44 into the bottomed groove 35b.

[0076] According to this, when fitting the bushing 40 onto the shaft portion 33, the protrusion 44 at the tip of the arm portion 43 of the bushing 40 needs to climb over the terminal portion 35c of the small diameter portion 35 of the shaft portion 33 and fit into the bottomed groove 35b. Therefore, a guide portion 44a that is inclined with respect to the axis of the bushing 40 is provided on the side opposite to the first engaged portion 45a of the protrusion 44, allowing the arm portion 43 to move smoothly while flexing, thereby preventing damage to the protrusion 44.

[0077] Further, the large diameter portion 34 is provided with an insertion hole 34a penetrating in a direction perpendicular to the axis of the shaft portion 33. The bush 40 has a plurality of notches 46 arranged on an end face on a side not fitted onto the winding shaft 60, the notches 46 being cut out radially from the axis of the bush 40 toward the end face on the side fitted onto the winding shaft 60, With the shaft portion 33 inserted into the bushing 40, the insertion hole 34a and the notch 46 are connected, and a lock pin 110 is inserted into the insertion hole 34a and the notch 46, thereby restricting rotation of the bushing 40 and locking rotation of the winding shaft 60.

[0078] This allows the coil spring 90 serving as the biasing member inside the curtain unit 15 to be kept wound for a long period of time, which is useful when the work of assembling the curtain unit 15 to the case 20 is carried out in a remote location. The structure of the bush 40 is such that the lock pin 110 is inserted in a direction perpendicular to the axis of the shaft 33, but the bush 40 has multiple notches 46 formed therein, so that the curtain unit 15 can be locked at any rotational position. Furthermore, the mold for manufacturing the bush 40 does not require a slide structure, which helps reduce costs.

[0079] The noise prevention structure for a curtain unit of the present invention is not limited to the above-mentioned configuration, and various design modifications are possible without departing from the gist of the present invention.

[0080] For example, the number of the notches 46 can be changed appropriately to a number other than twelve, so long as the notches 46 can communicate with the insertion holes 34a.

[0081] Furthermore, the shape of the lock pin 110 may be modified as appropriate as long as it can be inserted into the insertion hole 34a and the notch 46. [Explanation of symbols]

[0082] 10 Vehicle sunshade device 15 Curtain Unit 20 cases 30 Front Holder 33 Shaft 34 Large diameter section 34a Insertion hole 35 Small diameter section 35b Bottomed groove 36 Tip 37a First engaging part 37b Second engaging part 40 Bush 40a Large inner diameter section 40b Small inner diameter part 41 Fitting part 43 Arm section 44 Protrusion 44a Guide part 45a First engaged part 45b Second engaged part 46 Notch 60 Winding shaft 70 Curtains 80 Slider 90 Coil spring 110 Lock pin

Claims

1. A structure for preventing abnormal noise from a curtain unit that can be attached to a case constituting a vehicle sunshade device, comprising: The curtain unit includes: A cylindrical winding shaft; A curtain wound on the winding shaft; A biasing member that biases the curtain in a rolling-up direction; an attachment holder that can be attached to the case and is disposed on one end side of the winding shaft in the axial direction and has a shaft portion; a bush that is fitted onto the winding shaft at one end side in the axial direction of the winding shaft, and into which the shaft portion is rotatably inserted to serve as a bearing; a slider that is slidable within the winding shaft along the axial direction of the winding shaft and that can follow the rotation of the winding shaft; Equipped with The other end side of the winding shaft in the axial direction is rotatably attached to the case, The biasing member is disposed so as to bridge the shaft portion and the slider, The shaft portion is a large diameter portion disposed on a base end side, a small diameter portion extended from the large diameter portion and formed with a diameter smaller than that of the large diameter portion, and a tip portion extended from the small diameter portion and formed with a width smaller than that of the small diameter portion, and an annular bottomed groove is disposed on the tip end side of the small diameter portion from an outer circumferential surface of the small diameter portion toward the axis of the shaft portion, A side surface of the bottomed groove on the tip end side in the axial direction of the shaft portion serves as a first engagement portion, A step surface connecting the large diameter portion and the small diameter portion serves as a second engagement portion, The bushing is the inner circumferential surface side has a large inner diameter portion and a small inner diameter portion formed to have a diameter smaller than that of the large inner diameter portion, the outer circumferential surface side has a fitting portion that can be fitted with the inner circumferential surface of the winding shaft, a plurality of arm portions extending from the fitting portion along the axial direction of the bush, and protrusions protruding from the tip ends of the arm portions toward the axis of the bush, A tip side surface of the protrusion serves as a first engaged portion that is engageable with the first engaging portion, a step surface connecting the large inner diameter portion and the small inner diameter portion serves as a second engaged portion engageable with the second engaging portion, In an assembled state, the first engaging portion and the first engaged portion, and the second engaging portion and the second engaged portion are engaged with each other, thereby restricting the movement of the bush in the axial direction of the shaft portion, A noise prevention structure for a curtain unit, characterized in that the arm portion is arranged so as to face the bottomed groove and so as to have a gap between the arm portion and the shaft portion.

2. A noise prevention structure for a curtain unit as described in claim 1, characterized in that a guide portion is arranged on the opposite side of the protrusion from the first engaged portion, the guide portion being formed at an angle with respect to the axis of the bush and guiding the protrusion into the bottomed groove.

3. The large diameter portion has an insertion hole extending therethrough in a direction perpendicular to the axis of the shaft portion, The bush has a plurality of notches arranged on an end surface of the bush that is not fitted onto the winding shaft, the notches being cut out radially from an axis of the bush toward an end surface of the bush that is fitted onto the winding shaft, A noise prevention structure for a curtain unit as described in claim 1 or 2, characterized in that when the shaft portion is inserted into the bush, the insertion hole and the notch are connected, and a lock pin is inserted into the insertion hole and the notch, thereby restricting rotation of the bush and locking rotation of the winding shaft.

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