JP4693601B2 - 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. “Breaking induction part” means 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 part, the outer surface of the fitting shaft part Widely include a mode in which cuts or notches (grooves) are provided on each of the front surface side and the rear surface side, 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 against the external force is set on the side opposite to the fracture starting point with respect to the axis of the support shaft and on the outer side of the vehicle body side of the vehicle body side fixed part , so that the fracture occurs from the fracture starting point toward the fulcrum side. Has been. In the present invention, the `` breaking start point '' is a point that becomes a starting point when the breakage of the support shaft is started, and typically, as a breakage induction portion formed on the outer surface rear side of the fitting shaft portion, Consists of notches and notches. 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 fitting shaft portion, breakage occurs on the fitting shaft portion breakage starting portion as a starting point is breaking starting portion about the axis of the coupling shaft portion fitted with the fulcrum of the vehicle body side fixing portion It has the fracture | rupture induction | guidance | derivation part induced | guided | derived toward the area | region between symmetrical positions. The “breakage inducing portion” in the present invention is typically constituted by a notch or notch having a predetermined depth in the radial direction as a breakage inducing portion formed on the outer surface of the fitting shaft portion. .
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 rupture tends to proceed toward a portion where stress generated in the fitting shaft portion is most concentrated, that is, a fulcrum. In this case, according to the present invention, breakage occurred in the fitting shaft portion breakage starting portion as a starting point is, the break induction part, symmetrical fracture starting point portion about the axis of the coupling shaft portion fitted with the fulcrum of the vehicle body side fixing portion Guiding to the area between the location. That is, the breakage guiding portion controls the progress direction of breakage so that the fracture surface is generated in the hollow hole portion of the vehicle body side fixing portion. This can reasonably prevent the fracture surface of the fitting shaft portion remaining in the hollow hole portion of the vehicle body side fixing portion from protruding from the hollow hole portion of the vehicle body side fixing portion to the vehicle compartment side.

(Invention of Claim 2)
According to the second aspect of the present invention, the break that occurs in the fitting shaft portion of the vehicle sun visor according to the first aspect is that the break start point side is the break start point and the fulcrum side is the break end point. In the configuration, the breakage guide portion is provided on the fulcrum side. According to such a configuration, the progress direction of the break that occurs starting from the break starting point is controlled to be inside the fulcrum by the break guide provided on the fulcrum side, and thereby the fitting shaft portion Can be generated in the hollow hole portion of the vehicle-side fixing portion.

(Invention of Claim 3)
According to the third aspect of the present invention, the break that occurs in the fitting shaft portion in the vehicle sun visor according to the first or second aspect is such that the break start point side is the break start point and the fulcrum side is the break end point. In this configuration, the breakage guide portion is provided in an intermediate region between the breakage starting point side and the fulcrum side. According to such a configuration, the rupture occurring at the rupture starting point is controlled by the rupture guiding part in the intermediate region through the rupture guiding part toward the inside of the fulcrum, thereby breaking the fitting shaft part on the vehicle side. It can be generated in the hollow hole portion of the fixed portion.

  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). Cuts 125a and 125b are formed as slit-like recesses having a predetermined depth in the radial direction on the front side and the rear side of the parallel shaft part 121, respectively. The front and rear cuts 125a and 125b have a predetermined step in the axial direction (vertical direction) of the vertical axis portion 105a. That is, the front-side cut 125a is formed below the rear-side cut 125b. These notches 125a and 125b constitute a stress concentration portion as a fracture inducing portion. The front-side notch 125a corresponds to the “rupture-inducing portion” in the present invention, and the rear-side (left side in the drawing) notch 125b is the present invention. This corresponds to the “break start point”.
As shown in FIG. 4, the front and rear cuts 125a and 125b are formed in a shape that forms a two-sided width cut by two straight lines parallel to each other. The cuts 125a and 125b are shaped as shown in FIG. Instead, it is possible to adopt a configuration that extends in an arc shape in the circumferential direction as shown in FIG. 5, or a configuration that has a plurality of notches 125c and 125d in the circumferential direction as shown in FIG. .

  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 notch 125a on the front side is a hole opening end surface of the bearing portion 127, that is, The rear-side cut 125b is placed at a position deeper than the front-side cut 125a. 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 hole opening end surface of the mounting bracket 107 is chamfered by a curved surface (R-shaped surface), whereby a contact start portion (a boundary portion between contact and non-contact) with the vertical axis portion 105a is formed. It enters the inner side (upper side) by a predetermined amount from the hole opening end face. Of the peripheral surface of the contact start portion, the contact start portion on the front side serves as a fulcrum 127e of the external force when an external force in the direction of the arrow shown in the drawing from the rear to the front acts on the support shaft 105. The front-side cut 125a described above is arranged at a position where a predetermined amount enters the inside (upper side) from the fulcrum 127e. In this case, the position where the front-side cut 125a is arranged is a midpoint between the symmetrical position of the back-side cut 125b and the fulcrum 127e with respect to the axis of the vertical axis 105a, or a position closer to the fulcrum 127e than the midpoint. It is preferable to set so that.

  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 is directly applied to the support shaft 105 through the sun visor body 103 or shock, the longitudinal axis portion 105a of the support shaft 105 It breaks in the stress concentration part constituted by the cuts 125a and 125b. 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. Proceed toward the fulcrum 127e.

In this case, in a configuration in which the fulcrum 127e is positioned near the hole opening end of the bearing 127, as described in Patent Document 1, a stress concentration portion including an annular groove is provided on the vertical axis 105a. In spite of this, the breakage that originated from the notch 125b on the rear side proceeds along the annular groove toward the fulcrum 127e without going forward, and as a result, breakage of the vertical axis 105a. Even if the cross section is exposed from the end face on the indoor side of the bearing 127 or not exposed, it may occur near the end face on the indoor side.
However, according to the present embodiment, as described above, the notch 125a on the front side is set at the inner position close to the fulcrum 127e, so that the notch 125b on the rear side is used as the starting point and the The break to be directed can be guided to the inner side of the fulcrum 127e. That is, according to the present embodiment, the breaking direction is controlled by the notch 125a on the front side, and the end point portion of the break that occurs from the notch 125b on the rear side is located inside the fulcrum 127e. It is possible to lead to the notch 125a on the front surface side and cause the longitudinal axis portion 105a to break 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. 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, the longitudinal axis portion 105a is formed as a breakage induction portion on both side surface portions as an intermediate region between the front-side cut 125a and the rear-side cut 125b in the first embodiment described above. The notch 125e is further formed. Other configurations are the same as those in the first embodiment described above. In this embodiment, as shown in FIG. 8, the side surface incision 125e has a shape that forms a two-surface width similar to that of the front and rear incisions 125a and 12b, but instead, in the first embodiment, As described (see FIGS. 5 and 6), the notch 125e is changed to an aspect in which the notch 125e extends in an arc shape in the circumferential direction of the longitudinal axis portion 105a, or a form in which a plurality of notches 125e are intermittently present in the circumferential direction. May be.

  In the present embodiment, when the external force including a horizontal direction component or a horizontal direction component directed from the rear to the front acts directly on the spindle 105 through the sun visor main body 103 or impacts, the rear surface of the vertical axis portion 105a. The rupture generated in the side cut 125b is guided to the side cut 125e, and then to the front cut 125a. This makes it possible to control the breakage that occurs in the longitudinal axis portion 105a so as to be directed toward the inside of the fulcrum 127e, and the breakage in the hole of the bearing portion 127 can be more rationally performed.

  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 second embodiment, the front and side portions of the vertical axis portion 105a are provided with cuts 125a and 125e as breakage guide portions. However, the front-side cuts 125a are omitted, and only the side portions are provided. It may be changed to a configuration in which the notch 125e is formed. Further, the side portion notches 125e have been described in the case where they are provided on both side surfaces, but a structure provided on one side surface may be employed.

The present invention has the following characteristic aspects.
(Aspect 1) The fracture inducing portion is constituted by a slit-like recess having a predetermined depth in the radial direction formed on the outer surface of the vertical axis.
(Aspect 2) The fracture inducing portion extends in an arc shape along the outer surface of the vertical axis portion.
(Aspect 3) The fracture inducing portion exists intermittently along the outer surface of the vertical axis portion.
(Aspect 4) The fracture inducing portion is provided in a region narrower than the vertical direction of the circumferential direction of 180 degrees.
(Aspect 5) The fracture starting point portion is constituted by a slit-like concave portion having a predetermined depth in the radial direction formed on the outer surface of the vertical axis portion.
(Aspect 6) The slit-like concave portion on the front surface side as the fracture inducing portion is closer to the fulcrum than the intermediate point between the symmetrical position and the fulcrum of the rear-side slit-shaped concave portion with respect to the axis of the vertical axis Set to position.

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 fracture | rupture induction | guidance | derivation part. It is a fragmentary cross-sectional view which shows the other modification regarding a fracture | rupture induction | guidance | derivation 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 122 Tapered shaft portion 124 Locking head portion 125a Notch on the front side (stress concentration portion, breakage induction portion)
125b Notch on the rear side (stress concentration part, fracture starting part)
125c Notch on front side (stress concentration part, breakage induction part)
125d Notch on the rear side (stress concentrated part, fracture starting part)
125e Incision on the side surface (stress concentration part, breakage induction part)
126 Mounting base 127 Bearing 127a Parallel hole (hollow hole)
127b Tapered hole (hollow hole)
127c locking claw 127e fulcrum

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 fulcrum for the external force is set on the side opposite to the rupture starting point with respect to the axis and on the outer side of the vehicle body side fixing portion, whereby the rupture occurs from the rupture starting portion toward the fulcrum side. A vehicle sun visor configured as follows:
The fitting shaft portion, the rupture occurring in the fitting shaft portion as a starting point the fracture starting point unit, the symmetrical position of the fracture starting point unit about the axis of the fulcrum and front Symbol fitting shaft portion of the vehicle body side fixing portion A vehicle sun visor comprising a breakage guiding portion that guides toward a region between the two . The vehicle sun visor according to claim 1,
In the configuration in which the breakage occurring in the fitting shaft portion is the break start point side as the break start point and the fulcrum side is the break end point, the break guide portion is provided on the fulcrum side. A featured vehicle sun visor. The vehicle sun visor according to claim 1 or 2,
In the configuration in which the break generated in the fitting shaft portion is the break starting point side on the break starting point side and the fulcrum side is the break end point, the break guiding portion is formed between the break starting point side and the fulcrum side. A vehicle sun visor characterized by being provided in an intermediate region therebetween.

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