JP4693600B2 - Vehicle sun visor - Google Patents

Description

  The present invention relates to a vehicle sun visor.

  In the vehicle sun visor, the support shaft for attaching the sun visor body to the passenger compartment is made of resin from the viewpoints of weight reduction, harmony with the color of the passenger compartment, appearance, etc., or because it is easy to manufacture in the desired shape. Is adopted. However, in the case of a resin-made support shaft, an external force acts on the support shaft in a shocking manner, and when the support shaft breaks outside the bracket as the vehicle-side fixing portion, the broken portion is exposed in the vehicle interior. There is. For this reason, in order to solve the above problem, a technique has been proposed in which the breakage of the support shaft occurs inside the bracket. Such a technique is disclosed, for example, in Japanese Utility Model Laid-Open No. 6-74418 (Patent Document 1).

In the vehicle sun visor disclosed in Patent Document 1, an annular groove is provided as a fragile portion on the outer periphery of the support shaft, and when the shocking external force acts on the support shaft, it is designed to break in the annular groove. Yes, the annular groove is set to be located inside the bracket. However, in the case of a structure in which an annular groove is provided as in Patent Document 1, when an external force directed from the rear to the front acts on the support shaft, the support shaft starts to break starting from the rear end portion of the annular groove. However, the fracture may not always proceed along the groove. As a result, there is a possibility that a fracture surface of the support shaft may occur near the surface of the bracket on the passenger compartment side, and there is still room for improvement in this respect.
Japanese Utility Model Publication No. 6-74418

  In view of the above, an object of the present invention is to provide a technique that is effective in causing a breakage of a support shaft in a hollow hole of a vehicle body side fixing portion in a vehicle sun visor.

In order to achieve the above object, the invention described in each claim is configured.
A vehicle sun visor according to a first aspect of the present invention includes a sun visor body, a vehicle body side fixing portion, and a support shaft that connects the sun visor body to the vehicle body side fixing portion. The support shaft has a fitting shaft portion fitted in the hollow hole portion of the vehicle body side fixed portion, and is configured to be broken at the fitting shaft portion when a predetermined amount of external force acts on the support shaft from a predetermined direction. Is done. The “vehicle body side fixing portion” in the present invention typically corresponds to a bearing member (bracket) provided as a separate component from the ceiling surface component in order to attach the sun visor to the ceiling surface of the vehicle body. However, the configuration in which the support shaft is directly attached to the structural member of the ceiling surface is a concept including the structural member of the ceiling surface. The “configuration that breaks at the fitting shaft portion” in the present invention typically corresponds to providing a stress concentration region as a breakage inducing portion that induces breakage in the fitting shaft portion. The “breakage inducing portion” refers to a mode in which a notch or notch (groove) of a predetermined depth is provided in the radial direction only on the rear side (side facing the occupant) on the outer surface of the fitting shaft portion, A wide range includes a mode in which notches or grooves (grooves) are provided in each of the front surface side and the rear surface side on the outer surface, and a mode in which an annular groove is provided over the entire outer surface of the fitting shaft portion. The “predetermined direction” typically includes a substantially horizontal direction from the rear to the front, that is, a radial direction, and includes a direction including a radial component.
In the present invention, the fitting shaft portion is provided with a break starting point portion that induces breakage at a position deeper in the axial direction than the outer surface on the vehicle compartment side of the vehicle body side fixing portion. The fulcrum with respect to the external force is set on the opposite side of the rupture starting point with respect to the axis of the fulcrum, whereby the rupture occurs from the rupture starting point toward the fulcrum. In the present invention, the “break start portion” is a location that becomes a start point when the support shaft starts to be broken, and is typically a “break trigger portion” formed on the rear side of the outer surface of the fitting shaft portion. It is composed of notches, notches, etc. Further, the “fulcrum for external force” refers to a front contact start point (boundary between contact and non-contact) in the hollow hole portion of the vehicle body side fixed portion with respect to the fitting shaft portion.

In the present invention, as a characteristic configuration, the fulcrum is set at a position deeper in the axial direction than the vehicle body side outer surface of the vehicle body side fixing portion. Here, the “axially deep position” refers to a position that has entered the hollow hole portion, and preferably a fracture starting point portion and a point-symmetrical position or a position in the vicinity thereof with respect to the axis of the support shaft.
When a shocking external force acts in the lateral direction (radial direction) or a direction including a radial component with respect to the support shaft, and this external force breaks the fitting shaft portion of the support shaft, it occurred at the break starting point portion. The crack progresses toward a portion where stress generated in the fitting shaft portion is most concentrated, that is, a fulcrum. According to the present invention, the fulcrum for the external force acting on the support shaft is set at a position deeper in the axial direction than the vehicle body side outer surface of the vehicle body side fixing portion. It can be in the hole. That is, the fracture surface of the fitting shaft portion remaining on the vehicle body side fixing portion is generated in the hollow hole portion of the vehicle body side fixing portion, and the fracture surface projects from the hollow hole portion of the vehicle body side fixing portion to the vehicle compartment side. It is possible to reasonably prevent the remaining substantially in the same state.

Further, according to the present invention, the fitting area of the middle cavity and the fitting shaft portion per predetermined axially inner surface of the hollow bore from the cabin side outer surface of the vehicle body side fixing portion toward the rear side A thinning portion extending in length is formed, and a contact portion between the rear end portion of the thinning portion and the fitting shaft portion is a fulcrum of external force acting on the support shaft. The “thickening portion” in the present invention is to form a recess (notch) on the inner surface of the hollow hole portion on the side where the inner diameter is widened. Either the aspect which forms a dent over a predetermined area | region, or the aspect which forms a dent over the perimeter suitably is included suitably. According to the present invention, the thinned portion can be easily configured by applying simple processing to the hollow hole portion of the vehicle body side fixing portion or by molding.

(Invention of Claim 2 )
According to the invention described in claim 2, fitting region of the middle cavity and the fitting shaft portion per from the cabin side outer surface of the vehicle body side fixing portion to the outer surface of the fitting shaft portion toward the rear side A thinning portion extending in a predetermined length in the axial direction is formed, and a contact portion between the back end portion of the thinning portion and the hollow hole portion is a fulcrum of external force acting on the support shaft. The “thickening portion” in the present invention is to form a recess (notch) on the outer surface of the fitting shaft portion on the side where the outer diameter is reduced, and as an aspect thereof, the outer diameter portion of the fitting shaft portion. Therefore, any of an aspect in which a dent is formed over a predetermined region in the circumferential direction or an aspect in which a dent is formed over the entire circumference is suitably included. According to the present invention, similarly to the second aspect of the invention, the thinned portion can be easily configured by applying a simple process to the fitting shaft portion of the support shaft or by molding.

(Invention of Claim 3 )
According to the invention described in claim 3 , the fitting shaft portion in the vehicle sun visor described in claim 1 or 2 is configured to have a stress concentration portion at a portion corresponding to the fulcrum. The “part corresponding to the fulcrum” in the present invention refers to an aspect in which the fulcrum and the stress concentration part substantially coincide with each other in the axial direction of the fitting shaft part. In addition, the “stress concentration portion” corresponds to an aspect in which the fitting shaft portion is appropriately provided with a cut or notch having a depth in the radial direction. Thus, when the stress concentration part and the fulcrum are set at corresponding positions, the stress generated inside the fitting shaft part easily concentrates on the stress concentration part when an external force acts on the support shaft, and the fracture surface The occurrence rate inside the hole can be further improved.

  According to the present invention, in the vehicle sun visor, a technique effective in causing the breakage of the support shaft inside the hollow hole of the vehicle body side fixing portion is provided.

(First embodiment of the present invention)
Hereinafter, a vehicle sun visor according to a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows the overall configuration of the vehicle sun visor according to the present embodiment. As shown in FIG. 1, a vehicle sun visor 101 according to the present embodiment generally includes a sun visor main body 103 constituting an outer shape of the sun visor 101, a support shaft 105 for mounting the sun visor main body 103 on the vehicle, The mounting bracket 107 is mainly used. The support shaft 105 is formed in a substantially L shape having a vertical axis portion 105a extending in a substantially vertical direction and a horizontal shaft portion 105b extending in a generally horizontal direction. The horizontal shaft portion 105b of the support shaft 105 is attached to a bearing portion (not shown for convenience) built in one corner of the upper edge portion of the sun visor main body 103, whereby the sun visor main body 103 is attached to the horizontal shaft portion 105b. It is relatively rotatable around the axis. The longitudinal axis portion 105 a of the support shaft 105 is rotatably attached to the front corner portion of the passenger compartment ceiling surface via the mounting bracket 107. The vertical axis portion 105a corresponds to the “fitting shaft portion” in the present invention, and the mounting bracket 107 corresponds to the “vehicle side fixing portion” in the present invention.

  The sun visor 101 mounted on the ceiling surface of the passenger compartment is rotated about the axis of the horizontal shaft portion 105b, so that it is placed along the windshield and the storage position where the sun visor 101 is placed along the ceiling surface of the passenger compartment. The arrangement position can be changed between the light shielding position. Moreover, the sun visor 101 can change the arrangement position between the front position and the side position along the side glass by rotating around the vertical axis portion 105a. The sun visor body 103 has a support shaft 109 on the free end side of the upper edge. The support shaft 109 is held by a hook (not shown for convenience) attached to the ceiling surface of the passenger compartment. This stabilizes the rotation operation of the sun visor 101 when the arrangement position of the sun visor 101 is changed from the storage position to the light shielding position or from the light shielding position to the storage position.

  As shown in FIG. 2, the longitudinal axis portion 105 a of the support shaft 105 includes a parallel shaft portion 121, a tapered shaft portion 122, a small diameter shaft portion 123, and a locking head in order from the L-shaped bent portion toward the tip portion (upper end portion). A notch 125a, 125b as a slit-shaped recess is formed on each of the front side and the rear side at the boundary portion between the parallel shaft portion 121 and the tapered shaft portion 122. The notches 125a and 125b constitute a stress concentration portion as a breakage inducing portion, and the notch 125b on the rear side (the left side in the drawing) corresponds to the “breaking start portion” in the present invention. As shown in FIG. 4, the front and rear cuts 125a and 125b form a stress concentrating portion having a substantially oblong cross section having a two-sided width cut by two straight lines parallel to each other. The incisions 125a and 125b are changed to the shape shown in FIG. 4 and, as shown in FIG. 5, are configured to continuously extend in an arc shape at the same depth along the circumferential direction, or as shown in FIG. Thus, it is possible to employ a configuration in which a plurality of notches 125c and 125d are formed along the circumferential direction, and a configuration in which grooves are set over the entire circumference, although not shown.

  The mounting bracket 107 mounted on the ceiling surface of the passenger compartment has a mounting base portion 126 and a bearing portion 127. The attachment base 126 is fixed to the passenger compartment ceiling by screws (not shown). The bearing portion 127 has a parallel hole 127a and a tapered hole 127b in order from the lower side to the upper side, and a locking claw 127c that is elastically deformable by a split groove is formed at the upper end portion. Yes. The parallel holes 127a and the tapered holes 127b correspond to the “hollow hole portions” in the present invention.

  The longitudinal axis portion 105 a of the support shaft 105 is attached by being inserted into the bearing portion 127 of the attachment bracket 107. That is, when the longitudinal axis portion 105a of the support shaft 105 is inserted into the bearing portion 127 from below, the locking head portion 124 pushes away while elastically deforming the four locking claws 127c to protrude from the upper end of the bearing portion 127, and The locking claw 127c is locked to the step portion of the small diameter shaft portion 123 and is prevented from coming off. At this time, the tapered shaft portion 122 is fitted into the tapered hole 127b of the bearing portion 127, the parallel shaft portion 121 is fitted into the parallel hole 127a, and the notches 125a and 125b are the hole opening end surfaces of the bearing portion 127, that is, the vehicle interior. It is placed at a position deeper than the lateral outer surface. The longitudinal axis portion 105a of the support shaft 105 attached as described above is rotatable with respect to the attachment bracket 107, whereby the arrangement position of the sun visor 101 between the front position and the side position can be changed. Is done.

  As shown in FIG. 2, the mounting bracket 107 has a predetermined length in the axial direction from the opening end (lower end) of the parallel hole 127a to the back side of the parallel hole 127a of the bearing portion 127 toward the back side. It has a thinning portion 127d that extends. As shown in FIG. 4, the thickness removing portion 127d is formed in an arc shape over a predetermined region (for example, around 180 degrees) in the circumferential direction on the front surface of the parallel hole 127a. Thereby, as shown in FIG. 2, a gap C is formed in the front region of the fitting surface between the parallel shaft portion 121 and the parallel hole 127a. Then, at the rear end where the gap C disappears, the contact start portion (the boundary portion between contact and non-contact) between the rear end of the thinned portion 127 d and the vertical axis portion 105 a is rearward with respect to the support shaft 105. The fulcrum 127e of the external force when an external force in the direction of the arrow shown in the drawing from the front to the front acts. In addition, the depth of the thinning portion 127d is set so that the position of the fulcrum 127e faces the notch 125a on the front surface side (the right side in the drawing) formed in the vertical axis portion 105a.

The vehicle sun visor 101 according to the present embodiment is configured as described above. Therefore, when an external force including a horizontal or horizontal component directed from the rear to the front directly acts on the support shaft 105 through the sun visor main body 103 or impacts, the longitudinal axis portion 105a of the support shaft 105 has a notch 125a. , 125b is damaged at the stress concentration portion. That is, the breakage of the vertical axis portion 105a starts with the notch 125b on the rear surface side as a starting point. At this time, a bending moment or a shearing force acting on the vertical axis portion 105a is received by the fulcrum 127e. Therefore, the stress generated in the longitudinal axis portion 105a corresponding to the bending moment or the shearing force is concentrated near the fulcrum 127e, and as a result, the rupture generated from the notch 125b on the rear side is the Proceed toward the fulcrum 127e.
In this case, for example, when the fulcrum 127e is located at the hole opening end portion of the bearing portion 127, even if a stress concentration portion such as the notch 125a is provided on the front side, the notch 125b on the rear side is used as the starting point. As a result, the fracture that occurs as a result proceeds toward the fulcrum 127e, and as a result, the fracture surface of the vertical axis 105a may occur near the indoor end surface even when it is exposed from the indoor end surface of the bearing 127 or not exposed. is there.
According to the present embodiment, as described above, the position of the fulcrum 127e is set to a position deeper than the hole opening end portion of the bearing portion 127, so that the vertical axis portion 105a remaining on the bearing portion 127 side is broken. The cross section can be generated in the vicinity of the fulcrum 127e, that is, in the hole of the bearing portion 127. As a result, as shown in FIG. 3, the fracture surface of the longitudinal axis portion 105 a can be prevented from projecting from the hole opening end surface of the bearing portion 127 to the vehicle compartment side.

  In the present embodiment, the fulcrum 127e set at a position deeper than the hole opening end portion of the bearing portion 127 and the position of the notch 125a that is the stress concentration portion on the front side are substantially matched in the axial direction. Since the stress is easily concentrated, the rate of occurrence of the fracture surface inside the hole can be further improved. Note that the breaking stress when the vertical axis portion 105a starts to break can be adjusted as appropriate depending on the depth of cut or the width of the cuts 125a and 125b.

(Second embodiment of the present invention)
Next, a vehicle sun visor 101 according to a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, a thinning part 121a extending in a predetermined length in the axial direction is provided on the outer surface on the front surface side of the parallel shaft part 121 of the vertical axis part 105a, so that the space between the parallel shaft part 121 and the parallel hole 127a is provided. The clearance gap C is formed in this, and it is set as the structure which sets the fulcrum 127e in the position which became deep from the hole opening edge part of the bearing part 127 by this. In addition, as shown in FIG. 8, the thinning part 121a is formed in the circular arc shape over the range of the circumferential direction in the front surface of the parallel shaft part 121, for example, about 180 degree | times. As a result, as shown in FIG. 2, the contact start portion between the rear end portion of the thinning portion 121 a and the inner surface of the hole of the bearing portion 127 serves as a fulcrum 127 e of external force acting on the support shaft 105. In the present embodiment, the thinning part 121a reaches the front-side cut 125a formed in the vertical axis part 105a. For this reason, the fulcrum 127e is set on the notch 125a.

  According to the present embodiment configured as described above, when a shocking external force is applied to the support shaft 105 from the rear to the front, the longitudinal axis portion 105a as in the case of the first embodiment. Is concentrated in a region corresponding to the fulcrum 127e in the longitudinal axis portion 105a, thereby causing a fracture surface of the longitudinal axis portion 105a remaining on the bearing portion 127 side to be generated in the hole of the bearing portion 127. This is possible and can be generated in a state in which the fracture surface does not protrude from the hole opening end surface of the bearing portion 127 toward the passenger compartment.

  In the present embodiment, the support shaft 105 is mounted on the ceiling surface of the passenger compartment via the mounting bracket 107. However, the support shaft is configured with respect to a configuration member that does not include the mounting bracket 107, that is, a component that forms the ceiling surface. You may apply to the thing of the form which attaches 105 directly. In the embodiment described above, the cut 125a is set on the front surface side of the vertical axis portion 105a. However, this may be omitted. Further, the circumferential region in which the thinned portions 127d and 121a are formed is not limited to the illustrated 180 degrees.

The present invention has the following characteristic aspects.
(Aspect 1) The break starting point portion is constituted by a slit-like recess formed on the rear surface side of the vertical axis, and the recess has a predetermined depth in the radial direction of the vertical axis.
(Aspect 2) A thinning portion is formed in the bearing portion or the vertical axis portion, and the thinning portion is formed over an area of about 180 degrees in the circumferential direction on the inner surface of the hole of the bearing portion or the outer surface of the vertical axis portion. Thus, a gap is set between the inner surface of the bearing portion and the outer surface of the vertical axis portion.
(Aspect 3) The thinning portion is formed in an arc shape in the circumferential direction on the inner surface of the hole of the bearing portion or the outer surface of the vertical axis portion.
(Aspect 4) A slit-like recess is set on each of the front side and the rear side of the vertical axis.
(Aspect 5) The cross-sectional shape of the vertical axis portion having the slit-like concave portion described in aspect 4 is generally formed in an oval shape.
(Aspect 6) The slit-like concave portion formed as the fracture starting point portion or the stress concentration portion is formed in an arc shape along the peripheral surface of the vertical axis portion.
(Aspect 7) With respect to the axis of the vertical axis, the fulcrum is set at a position symmetrical to the slit-shaped concave portion as the fracture starting point formed on the vertical axis or in the vicinity thereof.

1 is a front view showing a schematic configuration of a vehicle sun visor according to a first embodiment of the present invention. It is a longitudinal cross-sectional view which shows the support structure of the longitudinal axis part of a spindle. It is a longitudinal cross-sectional view which shows the fracture | rupture state of a vertical axis | shaft part. It is a partial cross section figure which shows the support structure of the vertical axis | shaft part of a spindle. It is a partial cross-sectional view which shows the example of a change regarding a stress concentration part. It is a fragmentary cross-sectional view which shows the other example of a change regarding a stress concentration part. It is a longitudinal cross-sectional view which shows the support structure of the vertical axis | shaft part of the spindle which concerns on 2nd Embodiment. It is a fragmentary cross-sectional view which similarly shows the support structure of the vertical-axis part of a spindle.

DESCRIPTION OF SYMBOLS 101 Vehicle sun visor 103 Sun visor main body 105 Support shaft 105a Vertical axis | shaft (fitting shaft part)
105b Horizontal shaft portion 107 Mounting bracket (vehicle side fixing portion)
109 Support shaft 121 Parallel shaft portion 121a Carbide portion 122 Tapered shaft portion 123 Small diameter shaft portion 124 Locking head portion 125a Front side cut (stress concentration portion)
125b Notch on the rear side (stress concentration part, fracture starting part)
125c Notch on front side (stress concentration part)
125d Notch on the rear side (stress concentrated part, fracture starting part)
126 Mounting base 127 Bearing 127a Parallel hole (hollow hole)
127b Tapered hole (hollow hole)
127c Locking claw 127d Thinning part 127e Support point

Claims (3)

The sun visor itself,
A vehicle body side fixing part;
A spindle that connects the sun visor body to the vehicle body side fixing portion, and
The support shaft has a fitting shaft portion fitted in the hollow hole portion of the vehicle body side fixing portion, and the fitting shaft portion receives a predetermined amount of external force from the predetermined direction with respect to the support shaft. It is configured to break,
The fitting shaft portion is provided with a break starting point portion for inducing the start of breakage at a position deeper than the vehicle body side outer surface of the vehicle body side fixing portion, and the vehicle body side fixing portion includes the support shaft. A vehicle sun visor configured such that a fulcrum for the external force is set on the opposite side of the rupture starting point with respect to an axis, whereby the rupture occurs from the rupture starting point toward the fulcrum,
The fulcrum is set at a position deeper than the vehicle body side outer surface of the vehicle body side fixing portion ,
With respect to the fitting region between the hollow hole portion and the fitting shaft portion, the inner surface of the hollow hole portion is provided with a predetermined length in the axial direction from the outer side surface of the vehicle body side fixing portion toward the back side. A vehicle sun visor , wherein a meat portion is formed, and a contact portion between a rear end portion of the thinning portion and the fitting shaft portion is a fulcrum of an external force acting on the support shaft . The sun visor itself,
A vehicle body side fixing part;
A spindle that connects the sun visor body to the vehicle body side fixing portion, and
The support shaft has a fitting shaft portion fitted in the hollow hole portion of the vehicle body side fixing portion, and the fitting shaft portion receives a predetermined amount of external force from the predetermined direction with respect to the support shaft. It is configured to break,
The fitting shaft portion is provided with a break starting point portion for inducing the start of breakage at a position deeper than the vehicle body side outer surface of the vehicle body side fixing portion, and the vehicle body side fixing portion includes the support shaft. A vehicle sun visor configured such that a fulcrum for the external force is set on the opposite side of the rupture starting point with respect to an axis, whereby the rupture occurs from the rupture starting point toward the fulcrum,
The fulcrum is set at a position deeper than the vehicle body side outer surface of the vehicle body side fixing portion,
About the fitting area | region of the said hollow hole part and the said fitting shaft part, it extends in the axial direction toward the back | inner side from the vehicle interior side outer surface of the said vehicle body side fixing | fixed part to the outer surface of the said fitting shaft part by predetermined length. A vehicle sun visor characterized in that a thinning portion is formed, and a contact portion between a back end portion of the thinning portion and the hollow hole portion is a fulcrum of an external force acting on the support shaft. The vehicle sun visor according to claim 1 or 2 ,
The vehicle sun visor, wherein the fitting shaft portion has a stress concentration portion at a portion corresponding to the fulcrum.

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