JP6176605B2 - Vehicle sun visor - Google Patents

Description

  The present invention relates to a vehicle sun visor, and more particularly to a technique for maintaining excellent operability for a long time in a vehicle sun visor.

  Usually, a vehicle is provided with a sun visor as an awning obliquely above each of a driver seat and a passenger seat. Conventionally, various rotary sun visors for vehicles have been proposed (for example, see Patent Document 1).

  FIG. 13 is a diagram for explaining a vehicle sun visor described in Patent Document 1. A vehicle sun visor 100 includes a sun visor body 101. The sun visor body 101 includes a shell structure 101A and a shell structure 101B. The shell structure 101A and the shell structure 101B are joined by fitting the joining pin 102 of the shell structure 101A into the boss hole 103 of the shell structure 101B. The joined sun visor body 101 is rotatably supported by the shaft 104 for rotation. The sun visor body 101 incorporates a leaf spring 105 that is elastically fitted to the turning shaft 104. The leaf spring 105 tightens the turning shaft 104 and turns the sun visor body 101 on the turning torque (turning). Resistance). The sun visor main body 101 can be positioned by this turning torque, and can be adjusted by being turned against the turning torque.

  By the way, in order to improve the operability of the sun visor body, it is common practice to apply a lubricant to the peripheral surface of the rotating shaft to improve the lubricating performance between the rotating shaft and the contact surface of the leaf spring. In order to maintain this lubricating performance, it is necessary to always have a sufficient amount of lubricant interposed between the contact surfaces of the rotating shaft and the leaf spring.

JP 2009-107395 A

  However, in the above-described vehicle sun visor 100, when a lubricant is used for the rotation shaft 104, the lubricant is applied from the peripheral surface of the rotation shaft 104 by the tightening pressure of the leaf spring 105 applied to the peripheral surface of the rotation shaft 104. It will be scattered. For this reason, the lubricating performance between the contact surfaces of the shaft 104 for rotation and the leaf | plate spring 105 falls, and the malfunction which abnormal noise generate | occur | produces arises. Further, if the turning shaft 104 is scraped along with such a reduction in the lubricating performance, there also arises a problem that the turning torque of the sun visor body 101 is lowered.

  In Patent Document 1, by forming an uneven portion on the contact surface between the joining pin 102 and the boss hole 103, the frictional resistance between the joining pin 102 and the boss hole 103 is reduced, and the generation of abnormal noise is suppressed. Technology is disclosed. This technique is a technique for suppressing abnormal noise caused by the shell structure 101A and the shell structure 101B, and Patent Document 1 does not disclose a technique for solving the above-described lubricity problem.

  Therefore, the present invention has been made in view of such circumstances, and its purpose is to maintain the lubrication performance between the contact surface of the rotating shaft and the leaf spring for a long period of time and maintain excellent operability. And it is providing the sun visor for vehicles which prevents generation | occurrence | production of abnormal noise and the fall of rotational torque.

The vehicle sun visor of the present invention is
The sun visor body is rotatably supported by a rotation shaft, a leaf spring is elastically fitted to the circumferential surface of the rotation shaft, and a rotation torque is applied to the sun visor body.
A plurality of flat portions for holding the sun visor main body in a retracted position on the interior ceiling surface are provided on the peripheral surface of the horizontal shaft portion of the shaft for rotation, and in the axial direction of the horizontal shaft portion between each of the flat portions. Provide an adjacent curved surface part,
In the curved surface portion, a large number of uneven portions are formed so that the lubricant can be held, and the depth or height of the uneven portion is in a range of 20 μm to 40 μm in order to increase the friction coefficient of the curved surface portion. Set,
The leaf spring is composed of a shaft clamping portion and a fixing leg piece, and the shaft clamping portion is open to the fixing leg piece side and is formed in a substantially U shape so as to be fitted to the peripheral surface of the horizontal shaft portion. In the vehicle sun visor, the shape of the fixing leg piece is formed in a substantially U-shape opened to the shaft clamping portion side.
The leaf spring includes a planar inner surface and a curved inner surface facing the planar inner surface, and the planar inner surface is located when the sun visor body is in the retracted position of the interior ceiling surface. , Keep the position of the sun visor body to match the flat part,
When the sun visor body is rotated between the retracted position and the maximum deployed position, the curved inner surface of the leaf spring can contact the curved surface portion without contacting the flat portion of the horizontal shaft portion. And the curved surface portion formed on the horizontal shaft portion increases the coefficient of friction by the concave and convex portions so that the curved surface portion having a small area and the curved inner surface of the leaf spring are brought into contact with each other. The rotational torque is increased, and the sun visor body is held.

  According to this configuration, the lubricant is held and accumulated in the concavo-convex portion provided on the peripheral surface of the rotating shaft. For this reason, even if the clamping pressure of the leaf spring is applied to the peripheral surface of the rotation shaft, the lubricant can be prevented from being scattered from the peripheral surface of the rotation shaft. Therefore, the lubricant can be firmly interposed between the contact surfaces of the rotation shaft and the leaf spring member, and the lubrication performance between the contact surfaces of the rotation shaft and the leaf spring can be maintained for a long time.

  The vehicle sun visor according to the present invention is characterized in that the rotating shaft is a molded product formed of a synthetic resin, and the concavo-convex portion is formed by embossing.

  According to this configuration, it is possible to easily provide the peripheral surface uneven portion with the rotation shaf by using the texture processing.

  In the vehicle sun visor of the above invention, the peripheral surface is partially provided with a flat portion, and the leaf spring has a planar inner surface and a curved inner surface facing the planar inner surface. When the sun visor body is in the storage position of the ceiling surface of the passenger compartment, the planar inner surface is aligned with the flat portion to maintain the position of the sun visor body, and the curved inner surface is the surface of the sun visor body. When rotating between the storage position and the use position, the flat portion is not touched but is contacted with the peripheral surface while covering the flat portion, and the shaft is rotated in the axial direction with respect to the flat portion. The concavo-convex portion is provided in a curved surface portion that is a part of the adjacent peripheral surface and can contact the curved inner surface.

  In this structure, the uneven part was provided in the curved surface part adjacent to the flat part among the surrounding surfaces of the rotation shaft. In the curved surface portion, since the flat portions are adjacent to each other, a sufficient contact area cannot be obtained with respect to the curved inner surface of the leaf spring as compared with other surfaces of the peripheral surface of the rotating shaft. For this reason, if the concave and convex portion is not provided on the curved surface portion, the rotational torque of the sun visor main body is reduced, and the sun visor main body is not held at the use position and hangs down due to vibration or the like. In this regard, in the present invention, since the uneven portion is provided in the curved surface portion, the friction coefficient increases in the curved surface portion due to the uneven portion. Thereby, the rotation torque of the sun visor body can be increased in the rotation region of the sun visor body where the curved surface portion having a small area and the curved inner surface of the leaf spring come into contact with each other. As a result, it is possible to eliminate the problem that the sun visor body is not held and hangs down due to vibration, etc., and the sun visor body can be securely held at the use position.

  In the vehicle sun visor according to the invention, a plurality of the flat portions are provided along the axial direction, and the curved surface portion is located between two adjacent flat portions.

  According to this configuration, the coefficient of friction can be increased in a curved surface portion having a small area sandwiched between two adjacent flat portions.

  In the vehicle sun visor according to the invention, the depth or height of the uneven portion is set to 20 μm to 40 μm.

  According to this configuration, the depth or height of the concavo-convex portion can be set in an appropriate range, and the lubrication performance can be enhanced. That is, if the depth or height of the uneven portion is less than 20 μm, the amount of lubricant that accumulates in the uneven portion is insufficient, and the required lubricating performance may not be obtained. On the other hand, when the depth or height of the concavo-convex portion exceeds 40 μm, in the test for evaluating durability, it was confirmed that the peripheral surface of the rotating shaft was scraped. This is because, although good lubrication performance can be initially obtained by the lubricant accumulated in the uneven portions, the depth or height of the uneven portions is affected when the lubricant gradually decreases and the lubrication performance decreases. This is thought to be due to an increase in frictional resistance.

  According to the vehicle sun visor of the present invention, the lubricating performance between the contact surfaces of the rotating shaft and the leaf spring can be maintained for a long time. Therefore, it is possible to maintain excellent operability, prevent occurrence of abnormal noise, and obtain a stable rotational torque.

It is a front view of the sun visor for vehicles of a 1st embodiment concerning the present invention. It is the figure which extracted and showed the shaft for rotation and the leaf | plate spring from the structure of the vehicle sun visor shown by FIG. FIG. 3 is an exploded view of FIG. 2, illustrating a configuration of a rotation shaft. It is a figure explaining the effect | action of an uneven | corrugated | grooved part. It is a figure which expands and shows the cross section of the A section of FIG. It is a perspective view of the principal part of the sun visor for vehicles of a 2nd embodiment. It is the EE sectional view taken on the line of FIG. FIG. 7 is an exploded view of FIG. 6. It is F arrow line view of FIG. It is a figure explaining the rotation area of the sun visor for vehicles of a 2nd embodiment. It is a graph which shows the characteristic of the rotation torque in 2nd Embodiment. It is a graph which shows the characteristic of the rotation torque in a comparative example. It is a figure explaining the basic composition of the conventional technology.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment. Further, in the embodiment and the drawings, “front”, “rear”, “left”, “right”, “upper”, and “lower” each indicate a direction as viewed from a passenger who has boarded the vehicle.

(First embodiment)
The overall configuration of the vehicle sun visor according to the first embodiment will be described.
FIG. 1 is a front view of a sun visor for a vehicle, and is a diagram showing an internal configuration by cutting a part of a sun visor main body. As shown in FIG. 1, the vehicle sun visor 10 includes a sun visor body 11 having a sunshade function. The sun visor main body 11 is provided so as to be retractable on the ceiling surface of the passenger compartment at a position obliquely above the driver seat or the passenger seat. The occupant rotates the sun visor body 11 to adjust the position and orientation, thereby preventing dazzling such as direct sunlight from the front window or side window.

Hereinafter, the configuration of each unit will be described in detail.
The vehicle sun visor 10 includes a rotation shaft 30 that rotatably supports the sun visor body 11, a leaf spring 12 provided inside the sun visor body 11, and a bracket 13 that fixes the rotation shaft 30 to the vehicle body side. Consists mainly of.

  The sun visor body 11 includes, for example, a sun visor core 15 and a sun visor skin 16 that wraps the outer surface of the sun visor core 15. A mirror unit 17 may be provided at the center of the sun visor body 11. Various materials can be used for the sun visor core 15, but considering the improvement of the impact absorbing function and weight reduction, a bead foam molded body such as a polypropylene bead foam molded body or a polystyrene bead foam molded body is preferable. Moreover, it is preferable that the sun visor skin 16 is comprised with the material which has cushioning properties, such as a nonwoven fabric sheet, a cross sheet, and a resin sheet. Moreover, you may insert the loop-shaped wire frame 18 inside the sun visor core 15 as needed. Here, the sun visor main body 11 is configured by the sun visor core 15 and the sun visor skin 16, but the configuration of the sun visor main body 11 is arbitrary as long as it has a predetermined rigidity and awning function.

  The rotation shaft 30 is formed to be bent substantially in an L shape, and has a horizontal shaft portion 31 and a vertical shaft portion 32. The horizontal shaft portion 31 is a shaft portion extending in the left-right direction, and is inserted on the left and right sides (here, the left side) of the upper portion of the sun visor body 11. The vertical shaft portion 32 is connected to one end (here, the left end portion) of the horizontal shaft portion 31 through a bent portion, extends substantially vertically upward, and is inserted into the bracket 13.

  The leaf spring 12 is elastically fitted to the horizontal shaft portion 31 of the rotation shaft 30 by its elastic force. A rotation torque (rotation resistance) is applied to the sun visor body 11 by the elastic force of the leaf spring 12. With this rotational resistance, the sun visor body 11 can be positioned at an arbitrary rotational position. In addition, the further detailed structure of the shaft 30 for rotation and the leaf | plate spring 12 is mentioned later.

  The means for connecting the rotation shaft 30 to the sun visor body 11 is not particularly limited, and can be selected from various bearing structures used in known vehicle sun visors, and the type is arbitrary. Here, an example in which the bearing member 21 made of synthetic resin is provided inside the sun visor body 11 is shown.

  The bearing member 21 is formed in a substantially U-shape opened upward in a front view, and is molded into a predetermined shape by injection molding using a general-purpose synthetic resin such as polyacetal resin, polyamide resin, or polypropylene resin. Is done. The bearing member 21 has cylindrical left and right bearing portions 21a that are opposed to each other at a predetermined interval, and the left and right end portions of the horizontal shaft portion 31 of the shaft 30 for rotation are rotatable on the left and right bearing portions 21a. Mated. Thereby, the sun visor main body 11 can be rotated around the horizontal shaft portion 31, and the position can be adjusted between the storage position on the ceiling surface of the passenger compartment and the use position developed on the plane parallel to the front window. .

  The bracket 13 is fixed to the vehicle body side and supports the vertical shaft portion 32 of the rotation shaft 30 so as to be rotatable. Thereby, the sun visor body 11 can be rotated around the vertical shaft portion 32, and the position can be adjusted between the front window and the side window.

  Next, the configuration of the leaf spring 12 and the rotation shaft 30 will be described in detail with reference to FIGS. FIG. 2 is a view showing the rotating shaft 30 and the leaf spring 12 extracted from the configuration of the vehicle sun visor 10 shown in FIG. FIG. 3 is an exploded view of FIG.

  As shown in FIG. 2, the leaf spring 12 includes a shaft clamping portion 12a and a pair of front and rear fixing leg pieces 12b (only the rear side fixing leg piece 12b is shown in the figure). The shaft clamping portion 12a is formed in a predetermined cross-sectional shape (for example, a substantially U shape opened downward), is fitted in elastic contact with the horizontal shaft portion 31, and tightens the peripheral surface of the horizontal shaft portion 31. . The pair of fixing leg pieces 12b are connected to the lower end of the shaft holding portion 12a and extend so as to face each other. The plate spring 12 configured as described above is disposed between the left and right bearing portions 21a (see FIG. 1), and is attached so that the bearing member 21 (see FIG. 1) is sandwiched between a pair of fixing leg pieces 12b.

  As shown in FIG. 3, the rotation shaft 30 is a molded product in which a horizontal shaft portion 31 and a vertical shaft portion 32 are integrally formed, and is formed by, for example, injection molding using a general-purpose synthetic resin. The resin material used for the rotating shaft 30 is, for example, polyamide resin, polyethylene resin, polypropylene resin, polystyrene resin, polyethylene terephthalate resin, polyvinyl alcohol resin, vinyl chloride resin, polyacetal resin, polycarbonate. It can be arbitrarily selected from a series resin, an ionomer resin, an acrylonitrile / butadiene / styrene (ABS) resin, and the like. Furthermore, arbitrary fiber materials (for example, glass fiber etc.) may be mixed in the said resin material, and you may make it improve the abrasion resistance of the shaft 30 for rotation.

  The cross-sectional shape of the horizontal shaft portion 31 of the rotation shaft 30 is selected from various shapes including a circle and an ellipse according to functionality, operability, rotation torque, and the like required for the vehicle sun visor 10. .

  An arbitrary lubricant such as grease is interposed between the peripheral surface of the horizontal shaft portion 31 and the inner surface of the shaft holding portion 12a. A large number of concavo-convex portions 33 that can hold the lubricant are provided on the surface of the peripheral surface of the horizontal shaft portion 31 that is in contact with the shaft clamping portion 12a. Here, the example which provided the uneven | corrugated | grooved part 33 in the range B slightly longer than the axial direction length of the shaft clamping part 12a is shown. In the range B, many uneven parts 33 are provided in the axial direction and the circumferential direction of the circumferential surface of the horizontal shaft part 31.

  The concavo-convex portion 33 is constituted by a concave portion and a convex portion. The concavo-convex portion 33 can be selected from various concavo-convex patterns such as a leather pattern, a satin texture, a sand texture, a texture, a wood texture, a rock texture, and a geometric pattern. As a means for forming the concavo-convex portion 33, an embossing process is suitable in which an arbitrary pattern is provided on the molding surface of the molding die and this pattern is transferred to the surface of the molded product during molding.

  In FIG. 3, the vicinity of the bent portion indicated by a range C is an exposed portion (design surface) that is not covered by the sun visor body 11 (see FIG. 1) or the bracket 13. Even in this range C, the uneven portion 35 is provided as a design surface. The uneven portion 35 in the range C and the uneven portion 33 in the range B may be formed in the same pattern, or may be formed in different patterns.

The operation and effect of the vehicle sun visor 10 described above will be described with reference to FIG.
As shown in FIG. 4, since the lubricant 36 accumulates in a large number of uneven portions 33 provided in the range B of the horizontal shaft portion 31, even if the tightening pressure of the shaft clamping portion 12a is applied to the peripheral surface of the horizontal shaft portion 31, The lubricant 36 is prevented from being scattered from between the contact surfaces of the shaft clamping portion 12a and the horizontal shaft portion 31.

  On the other hand, conventionally, as indicated by the arrow (1), there is a problem that the lubricant 36 is scattered from the end of the shaft clamping portion 12a due to the tightening pressure of the shaft clamping portion 12a.

  In this respect, in the vehicle sun visor 10, since the lubricant 36 accumulates in the uneven portion 33, the lubricant 36 can be firmly interposed between the contact surfaces of the horizontal shaft portion 31 and the shaft sandwiching portion 12a. The lubrication performance between the contact surfaces of 12a and the horizontal shaft portion 31 can be maintained for a long time.

  Therefore, according to the vehicle sun visor 10, it is possible to maintain excellent operability, prevent occurrence of abnormal noise, and obtain a stable rotational torque.

  In addition, if the rotating shaft 30 is formed of synthetic resin and the uneven portion 33 is formed by embossing, a large number of uneven portions 33 can be easily provided on the peripheral surface of the rotating shaft 30.

Next, a suitable size of the depth or height of the uneven portion 33 will be described.
The present inventors have conducted various research and development, and by setting the depth (or height) D of the uneven portion 33 shown in FIG. 5 to an appropriate size, excellent lubrication performance is maintained for a long time. Succeeded.

  That is, when the depth D of the concavo-convex portion 33 is formed to be smaller than 20 μm and evaluation is performed, the lubricant cannot be sufficiently accumulated in the concavo-convex portion 33, and the required lubrication performance cannot be obtained sufficiently. I understood that.

  On the other hand, when the depth D of the concavo-convex portion 33 was formed to be larger than 40 μm and the durability of the rotation shaft 30 was evaluated, a problem that the peripheral surface of the rotation shaft 30 was scraped was confirmed. This is because, although good lubrication performance is initially obtained by the lubricant accumulated in the concavo-convex portion 33, when the lubricant gradually decreases and the lubrication performance deteriorates, the influence of the depth of the concavo-convex portion 33 increases, and the friction This is probably because the resistance increases (the rotating shaft 30 acts like a round bar file).

  As described above, the depth D of the uneven portion 33 is preferably set in a range of 20 μm to 40 μm, and by setting the depth D so as to be within this range, excellent lubrication performance can be maintained for a long time. I confirmed that I could do it. It should be noted that dimensions other than the depth of the concavo-convex portion 33 (such as the outer diameters and intervals of the concave and convex portions) are arbitrarily set according to the function required for the concavo-convex portion 33 or the type and viscosity of the lubricant. .

(Second Embodiment)
Next, 2nd Embodiment is described based on FIGS. In addition, the same code | symbol is attached | subjected to the element which is common in 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted.

  In the first embodiment described above, the concavo-convex portion 33 is provided in the horizontal axis portion 31 of the rotation shaft 30 over substantially the entire axial direction and circumferential direction of the range B (see FIG. 3). In addition, the uneven portion may be provided on at least a part of the peripheral surface of the horizontal shaft portion 31 that is in contact with the shaft holding portion 12a in which the friction coefficient is to be increased.

  In the second embodiment, as shown in FIGS. 6 and 7, the sun visor body 11 is rotatably supported by a rotation shaft 30 in the same manner as the vehicle sun visor 10 (see FIG. 1) described above. The leaf spring 12 is elastically fitted to the peripheral surface of the shaft 30 to apply a rotational torque to the sun visor body 11. The sun visor main body 11 is rotated about the rotation shaft 30 in the direction indicated by the arrow (2) in FIG. 7, so that the storage position on the ceiling surface 41 of the passenger compartment and the maximum deployment on the front window 42 side are achieved. The use position can be adjusted between the positions.

  As shown in FIG. 8, a flat portion 43 that holds the sun visor body 11 (see FIG. 7) in the storage position of the ceiling surface 41 (see FIG. 7) is partially provided on the peripheral surface of the horizontal shaft portion 31. A plurality (two in this example) of the flat portions 43 are provided along the axial direction of the horizontal shaft portion 31. Furthermore, as shown in FIG. 9, the rotation shaft 30 is a part of the peripheral surface of the horizontal shaft portion 31 and has a curved surface portion 45 adjacent to the flat portion 43 in the axial direction of the horizontal shaft portion 31. . In this example, the curved surface portion 45 is located between two adjacent flat portions 43. The curved surface portion 45 is provided with a large number of uneven portions 46.

  The concavo-convex portion 46 can hold the lubricant and acts to increase the friction coefficient of the curved surface portion 45. As a means for forming the concavo-convex portion 46, as in the case of the concavo-convex portion 33 (see FIG. 3) described above, an arbitrary pattern is formed on the molding surface of the molding die, and this pattern is transferred to the surface of the molded product during molding. Processing is preferred. Further, in order to obtain an appropriate friction coefficient in the curved surface portion 45, the depth or height of the uneven portion 46 is preferably 20 μm or more, and is set, for example, in the range of 20 μm to 40 μm.

  Returning to FIG. As shown in FIG. 8, the leaf spring 12 is composed of a shaft clamping portion 12a and a fixing leg 12b, and is formed by, for example, pressing a metal plate such as a steel plate. The shape of the fixing leg piece 12b is arbitrary, but here, the fixing leg piece 12b is formed in a substantially U-shape that opens to the shaft clamping portion 12a side. The means for fixing the fixing leg 12b to the sun visor body 11 (see FIG. 7) can be selected from various means. For example, the means is incorporated in the sun visor body 11 (see FIG. 7) and supports the horizontal shaft portion 31. The fixing leg piece 12b can be fixed to a bearing member (not shown) to be fixed.

  The shaft clamping portion 12 a is formed in a predetermined cross-sectional shape (for example, a substantially U shape opened to the fixing leg 12 b side), and is fitted to the peripheral surface of the horizontal shaft portion 31. An arbitrary lubricant such as grease is interposed between the shaft holding portion 12a and the peripheral surface of the horizontal shaft portion 31. The shaft clamping portion 12a includes a first plate-like portion 47 and a second plate-like portion 48 that face and hold the horizontal shaft portion 31 therebetween. The first plate-like portion 47 and the second plate-like portion 48 impart a rotational torque to the sun visor body 11 (see FIG. 7) by sandwiching the horizontal shaft portion 31. In this example, in the sun visor body 11 (see FIG. 7) in the use position, the first plate-like portion 47 faces rearward and the second plate-like portion 48 faces frontward.

  The first plate-like portion 47 has a plurality (three in this example) of divided pieces 47a. The plurality of divided pieces 47 a are arranged in the axial direction of the horizontal shaft portion 31 via a plurality of (in this example, two) slits 51. Each of the plurality of divided pieces 47 a is formed in a flat plate shape and includes a flat inner surface 52 that contacts the peripheral surface of the horizontal shaft portion 31. The split pieces 47a located at the left and right ends are provided at positions corresponding to the left and right flat portions 43 in the axial direction of the horizontal shaft portion 31, and the sun visor body 11 (see FIG. 7) is attached to the ceiling surface 41 (see FIG. 7). When in the retracted position, the planar inner surface 52 is aligned with the flat portion 43 to hold the position of the sun visor body 11 (see FIG. 7).

  On the other hand, the second plate-like portion 48 has no slit and is not divided. The second plate-like portion 48 is formed in a curved plate shape and includes a curved inner surface 53. The curved inner surface 53 is opposed to the planar inner surface 52 with the horizontal shaft portion 31 interposed therebetween, and is in contact with the peripheral surface of the horizontal shaft portion 31. The curved inner surface 53 does not contact the flat portion 43 of the horizontal shaft portion 31 in the process in which the sun visor body 11 (see FIG. 7) rotates between the retracted position and the maximum deployed position. The curved surface portion 45 can be contacted while covering. The curved inner surface 53 is preferably formed with a radius of curvature substantially the same as the radius of curvature of the peripheral surface of the horizontal shaft portion 31.

  The operation and effect of the vehicle sun visor 40 according to the second embodiment described above will be described with reference to FIGS.

  FIG. 10 is a view for explaining a rotation area of the sun visor body 11. FIG. 10 shows the position of the sun visor main body 11 that is rotated downward by the rotation angle θ from the storage position P1 on the ceiling surface 41 (the chain line indicated by the symbol P). There is a rotation range from P1 to the maximum deployment position P2 on the front window 42 side. FIG. 11 is a graph showing the characteristics of the rotation torque of the sun visor main body 11, the horizontal axis indicates the rotation angle θ with the storage position P1 being 0 °, and the vertical axis indicates the rotation torque.

  In the vehicle sun visor 40 of the second embodiment, as shown in FIG. 10 and FIG. 11, immediately after the sun visor main body 11 is rotated downward from the storage position P1, the leaf spring 12 that holds the flat portion 43 (more specifically, The rotational torque slightly increases due to the holding force of the planar inner surface 52), but the rotational torque decreases to an appropriate magnitude as the planar inner surface 52 moves away from the flat portion 43. Thereafter, a substantially constant and stable rotational torque is obtained up to the maximum deployed position P2.

Here, suppose that the curved surface portion 45 is not provided with an uneven portion.
FIG. 12 is a graph showing the characteristics of the rotational torque of the sun visor body 11 in a comparative example in which the curved surface portion 45 is not provided with an uneven portion, and is a graph corresponding to FIG.

  As shown in FIG. 12, in this comparative example, the turning torque begins to gradually decrease from the turning angle θ1 at which the curved inner surface 53 (see FIG. 10) begins to overlap the flat portion 43 (see FIG. 10). When the curved inner surface 53 is aligned with the flat portion 43, the rotational torque becomes the lowest. Then, the rotation torque is recovered at the rotation angle θ2 at which the curved inner surface 53 exceeds the flat portion 43. Thus, when the uneven portion is not provided on the curved surface portion 45, the rotational torque is greatly reduced in the rotation region from the rotation angle θ1 to the rotation angle θ2. This is because the contact area with the curved inner surface 53 is greatly reduced in the curved surface portion 45 having a small area sandwiched between the two flat portions 43. For this reason, in the rotation range from the rotation angle θ1 to the rotation angle θ2, there is a problem that the sun visor body 11 is not sufficiently held and hangs down due to vibration or the like.

  In this respect, in the vehicle sun visor 40 according to the second embodiment, since the uneven portion 46 is provided on the curved surface portion 45, the friction coefficient is increased by the uneven portion 46 in the curved surface portion 45. Thereby, as shown in FIG. 11, the rotational torque of the sun visor body 11 also decreases in the rotational range (rotational angles θ1 to θ2) in which the contact area between the leaf spring 12 and the horizontal shaft portion 31 decreases. It is possible to obtain a substantially constant and stable rotational torque without being favorably maintained. As a result, the problem that the sun visor body 11 hangs down due to vibration or the like can be solved, and the sun visor body 11 can be reliably held at the use position.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  For example, in the embodiment, the rotation shaft 30 is a solid shaft body made of synthetic resin. However, the rotation shaft according to the present invention is, for example, a combination of an alloy inner cylinder portion and a synthetic resin outer cylinder. A hollow shaft body or a shaft body formed by combining a plurality of members that can be divided in the axial direction may be used, and the structure of the rotating shaft is arbitrary as long as the uneven portion can be formed on the peripheral surface.

DESCRIPTION OF SYMBOLS 10 Vehicle sun visor 11 Sun visor main body 12 Leaf spring 30 Shaft for rotation 33 Uneven portion 36 Lubricant 40 Vehicle sun visor 41 Ceiling surface 43 Flat portion 45 Curved portion 46 Uneven portion 52 Planar inner surface 53 Curved inner surface D Depth ( height)

Claims (2)

The sun visor body is pivotably supported by the pivot shaft, the times on the peripheral surface of the dynamic shaft fitted a plate spring elastically, the rotational torque is imparted to the sun visor body,
A plurality of flat portions for holding the sun visor main body in a retracted position on the interior ceiling surface are provided on the peripheral surface of the horizontal shaft portion of the shaft for rotation, and in the axial direction of the horizontal shaft portion between each of the flat portions. Provide an adjacent curved surface part,
In the curved surface portion, a large number of uneven portions are formed so that the lubricant can be held, and the depth or height of the uneven portion is in a range of 20 μm to 40 μm in order to increase the friction coefficient of the curved surface portion. Set,
The leaf spring is composed of a shaft clamping portion and a fixing leg piece, and the shaft clamping portion is open to the fixing leg piece side and is formed in a substantially U shape so as to be fitted to the peripheral surface of the horizontal shaft portion. In the vehicle sun visor, the shape of the fixing leg piece is formed in a substantially U-shape opened to the shaft clamping portion side.
The leaf spring comprises a planar inner surface and a curved inner surface facing the planar inner surface,
When the sun visor body is in the retracted position of the vehicle interior ceiling surface, the planar inner surface maintains the position of the sun visor body in conformity with the flat portion,
When the sun visor body is rotated between the retracted position and the maximum deployed position, the curved inner surface of the leaf spring can contact the curved surface portion without contacting the flat portion of the horizontal shaft portion. And the curved surface portion formed on the horizontal shaft portion increases the coefficient of friction by the concave and convex portions so that the curved surface portion having a small area and the curved inner surface of the leaf spring are brought into contact with each other. Increasing the rotational torque and holding the sun visor body,
A vehicle sun visor. The rotating shaft is a molded product formed of a synthetic resin, and the uneven portion is formed by embossing.
The vehicle sun visor according to claim 1.

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