JP2002187481A - Pivot bearing part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pivot bearing part structure capable of realizing improvement of the pivot fastening strength at a pivot receiver. SOLUTION: The pivot receiver 12a wherein the pivot formed at a tip end of a stay is pressurized in is divided into a spherical surface 12d around an opening 12c and a spherical surface 12f around a bottom part. The spherical surface 12f around the bottom part is formed by being brought near to the opening 12c side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a shaft having a substantially spherical pivot formed at the end of a shaft and press-fitting the pivot into a hemispherical or more pivot receiving portion formed on the back surface of a resin member. And a pivot bearing structure in which the resin member is rotatably held.

[0002]

2. Description of the Related Art Conventionally, for example, in a vehicle rearview mirror, as shown in FIG. 5, a substantially spherical pivot 2 is formed at a distal end of a stay 1 whose base end is fixed to a vehicle body (not shown). The bracket 3 is rotatably held on the stay 1 by press-fitting the pivot 2 into a pivot receiving portion 4 having a hemispherical surface or more formed on the back surface of the bracket 3 made of resin. There is known a mirror holding a mirror body (not shown).

A user (mainly a driver) grips the mirror housing 5 and presses it in a predetermined direction, whereby the bracket 3, the mirror housing 4, and the mirror main body are integrally rotated about the center point P of the pivot 2. Thus, a visual field in a desired direction can be secured.

[0004]

By the way, in the pivot bearing structure configured as described above, as shown in FIG. 4, the pivot receiving portion 4 has a center point P 'which coincides with the center point P of the pivot 2. As shown in FIG. It was merely a shape that secured an area equal to or larger than a hemispherical surface to the extent that the pivot 2 could be prevented from falling off based on the above.

That is, the pivot 2 in the pivot receiving portion 4
Since the pivot receiving portion 4 has an area equal to or more than a hemispherical surface with respect to the center point P ′, an opening 4a smaller than the maximum diameter of the pivot 2 can be formed. This is achieved by pushing the pivot 2 into the pivot receiving portion 4 due to the material characteristics of the bracket 3 when the bracket 2 is pushed in.

Therefore, the tightening force of the pivot 2 in the pivot receiving portion 4 after the pivot 2 is press-fitted into the pivot receiving portion 4 is determined by the difference between the spherical outer diameter of the pivot 2 and the spherical inner diameter of the pivot receiving portion 4. The tightening force for the pivot 2 is determined. However, in order to prevent the vehicle rearview mirror from rotating unexpectedly at least due to the vibration generated during the traveling of the vehicle, the pivot receiving member is naturally larger than the spherical outer diameter of the pivot 2. The spherical inner diameter of the part 4 must be small. On the other hand, if the spherical inner diameter of the pivot receiving portion 4 is too smaller than the spherical outer diameter of the pivot 2, it is difficult to press-fit the pivot 2 and it is also difficult to rotate for securing a visual field in a desired direction.

On the other hand, when molding the bracket 3 with a resin, it is difficult to set the exact difference in the spherical diameter between the pivot 2 and the pivot receiving portion 4 due to a molding error caused by thermal contraction or the like after the mold release. Therefore, actually, pivot 2
Rather than tightening the whole of the pivot receiving part 4,
The fact is that only the periphery of the opening 4a of the pivot receiving portion 4 exhibits the effect of preventing the pivot 2 from coming off and the effect of tightening.

In addition, there has been a problem that the fastening force (stress) of the pivot receiving portion 4 is reduced due to aging and the like.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pivot bearing structure capable of improving the pivot tightening force at a pivot receiving portion in order to solve the above problems.

[0010]

In order to achieve the above object, a pivot bearing structure according to claim 1 divides a spherical surface around an opening of the pivot receiving portion and a spherical surface around a bottom portion, and further comprises: The gist is that the peripheral spherical surface is brought closer to the opening side of the pivot receiving portion.

The pivot bearing structure according to claim 2 is
The spherical surface around the opening is formed based on a center that coincides with the center of the pivot, and the spherical surface around the bottom is formed based on a center displaced toward the opening from the center of the pivot. Make a summary.

The pivot bearing structure according to claim 3 is
The gist is that a spherical surface around the bottom is formed integrally with the bracket via a thin hinge.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a pivot bearing structure according to the present invention will be described with reference to the drawings, applied to a vehicle rearview mirror.

Referring to FIG. 3, a vehicle rearview mirror 10 is shown.
Is a stay 11 whose base end (not shown) is fixed to the vehicle body.
And a resin bracket 12 held on a stay 11
A mirror housing 13 fixed to the bracket 12 and holding a mirror body (not shown); an anti-glare switching operation rotatably held by the mirror housing 13 and engaged with the lower end of the bracket 12 And a knob 14.

At the tip of the stay 11, a spherical pivot 11a centering on a point p is formed.

A mirror body is arranged on the front side of the bracket 12. A pivot receiving portion 12a into which the pivot 11a is press-fitted is formed on the back side of the bracket 12. At the lower end of the bracket 12, a chevron-shaped engaging recess 12b is formed to engage with an elastic engaging portion 14a formed at the upper end of the operation knob 14.

As shown in FIG. 1, the pivot receiving portion 12a has an opening 12c opened to the back side of the bracket 12,
A first tightening portion 12e having a first curved surface 12d formed on an inner curved surface having the same center as the center (point p) of the pivot 11a and the same diameter as the outer spherical surface of the pivot 11a.
And an inner diameter that is independent of the first curved surface 12d and that is centered on a point p ″ translated from the center (point p ′) of the first curved surface 12d toward the opening 12c by a distance H and has the same diameter as the outer spherical surface of the pivot 11a. A second tightening portion 12g having a second curved surface 12f formed on a curved surface; and a first tightening portion 12g such that the second tightening portion 12g can be displaced toward the front side of the bracket 12.
e and a thin hinge 12h connecting the second fastening portion 12g to the second fastening portion 12g are integrally formed.

Therefore, the pivot receiving portion 12a is
c, and a second curved surface 12f formed on the bottom surface facing the opening 12c.
And each of the curved surfaces 12
Although d and 12f are the inner diameter curved surfaces having the same diameter as the pivot 11a, when the divided curved surfaces are viewed as a whole, the inner diameter curved surface is smaller than the outer diameter curved surface of the pivot 11a.

The mirror housing 13 is formed with a guide groove 13a extending from the lower surface near the rear surface to the rear surface near the lower surface. A stopper wall 13b is formed in the guide groove 13a located on the back side of the mirror housing 13.

The operation knob 14 is bent at an intermediate portion thereof, and a knob 14b formed at a lower end thereof protrudes from the guide groove 13a. Further, the operation knob 14 rotates about a shaft portion 14c that engages with the mirror housing 13 (see FIG. 3).
When the knob portion 14d of the operation knob 14 comes into contact with the stopper portion 13b, the bracket 12, the mirror housing 13, and the mirror main body are integrally tilted about the pivot 11a, so that the whole is downward in the figure, The anti-glare function is switched by changing the reflectance of the mirror surface of the mirror body.

In the above configuration, when the pivot 11a is inserted from the opening 12c, the minimum opening diameter of the opening 12c is smaller than the maximum outer diameter of the pivot 11a. Two curved surfaces 12 that are spread out and divided
pivot 1 in a curved surface of a semi-spherical surface or more formed by d and 12f.
1a is press-fitted.

At this time, the second fastening portion 12g is
Since 2f is formed at the center of the curved surface at a point p ″ that is shifted closer to the opening 12c than the point p ′ that is the center of the curved surface of the first curved surface 12d, the elastic force of the thin hinge 12f is simultaneously applied to the pivot 11a. It is displaced toward the surface of the bracket 12 in opposition.

Therefore, due to the elastic restoring force of the thin hinge 12f, the opening 1 is larger than the center of the first curved surface 12d passing through the point p '.
The pivot 1 is formed by the portion located on the 2c side and the second curved surface 12f.
1a will be tightened.

This tightening force realizes a remarkable improvement in the tightening force as compared with the conventional structure in which the pivot 11a is tightened only at the portion located on the opening 12c side from the center passing through the point p 'of the first curved surface 12d. can do. Moreover, since the tightening force on the bottom surface portion of the divided curved surface facing the opening 12c, that is, the curved surface 12f at the peripheral position including the axis of the stay 11, is improved (in the thrust direction). By reducing the diameter of the inner diameter curved surface of the curved surface 12d, the pivot 11
Since the rotation (rolling within a curved surface) of the pivot 11a is easier than the configuration in which the tightening force a is improved (radial direction), the entire tilting operation and the operation knob by gripping the mirror housing 13 are performed. 14 can be easily operated.

In the above embodiment, the stay 1
1, the bracket 12 and the mirror housing 13 holding the mirror body are provided, and the bracket 12 is provided with the pivot receiving portion 12a. However, the present invention is not particularly limited to this.

For example, the vehicle mirror 20 shown in FIG.
A vehicle door mirror, in which a pivot 11a is formed so as to protrude from an inner surface of a mirror housing 23, a resin holder 22 having a pivot receiving portion 12a is provided on the pivot 11a, and the mirror body 25 held by the holder 22 is tilted. Is performed by the holder 22.

The vehicle mirror 30 shown in FIG.
Applied to an under mirror of a motorcycle or a large vehicle, a pivot 11a is formed at a tip of a stay 31 having a base fixed to a vehicle body, and a pivot receiving portion 12a is directly formed on a mirror housing 33 holding a mirror body 35. It was done.

The mirror 2 shown in FIGS.
At 0 and 30, since the specific configurations of the pivot 11a and the pivot receiving portion 12a are the same as those of the above-described embodiment, the same reference numerals are given and the description is omitted. However,
It is a matter of course that the size and position of the pivot 11a and the pivot receiving portion 12a can be arbitrarily changed depending on the configuration of the mirrors 20 and 30.

In the above embodiment, the pivot 11
The bracket 12, the holder 22, and the mirror housing 3 as a resin member are used for the pivot receiving portion 12a into which the a
Although disclosed in No. 3, the present invention is not limited to these vehicle mirrors, but can be applied to all types of pivot shafts connected to each other and made of resin.

For example, various desktop-type products such as small makeup mirrors, table clocks, desk lamps and the like (so-called swinging structures).
Needless to say, the present invention can be applied to the entire pivot shaft connection structure.

[0031]

As described above, in the pivot bearing structure according to the first aspect, the spherical surface around the opening and the spherical surface around the bottom of the pivot receiving portion are divided and the spherical surface around the bottom portion is divided. By bringing it closer to the opening side of the pivot receiver,
It is possible to improve the pivot tightening force in the pivot receiving portion.

In the pivot bearing structure according to the second aspect, the spherical surface around the opening is formed with reference to the center coinciding with the center of the pivot, and the spherical surface around the bottom is closer to the opening than the center of the pivot. As a result of being formed on the basis of the center displaced in the vertical direction, it is possible to improve the pivot tightening force in the pivot receiving portion while facilitating the molding and design of the entire spherical surface.

According to the third aspect of the present invention, since the spherical surface around the bottom is formed integrally with the resin member so as to be displaceable along the axial direction via the thin hinge, a molding error occurs on the entire spherical surface. Even so, a stable tightening force can be secured, and the reliability of the product can be improved.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a pivot bearing portion showing a pivot bearing structure according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a pivot receiving portion in a pivot press-fit state.

FIG. 3 is a longitudinal sectional view of a main part of the vehicle mirror.

FIG. 4 is an enlarged sectional view of a main part of a door mirror type vehicle mirror.

FIG. 5 is an enlarged sectional view of a main part of a motorcycle mirror of the same type.

FIG. 6 is an enlarged sectional view of a conventional pivot receiving portion.

FIG. 7 is a longitudinal sectional view of a main part of a conventional vehicle mirror.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Stay 11a ... Pivot 12 ... Bracket 12a ... Pivot receiving part 12c ... Opening 12d ... 1st curved surface 12f ... 2nd curved surface 12h ... Thin hinge

Claims (3)

[Claims] 1. A substantially spherical pivot is formed at a tip of a shaft, and the pivot is press-fitted into a semi-spherical or larger pivot receiving portion formed on a back surface of the resin member, whereby the resin member is attached to the shaft. In the pivot bearing structure held rotatably, the spherical surface around the opening of the pivot receiving portion and the spherical surface around the bottom portion are divided, and the spherical surface around the bottom portion is moved toward the opening side of the pivot receiving portion. A pivot bearing structure. 2. A spherical surface around the opening is formed based on a center coinciding with the center of the pivot, and a spherical surface around the bottom is formed based on a center displaced toward the opening from the center of the pivot. The pivot bearing part structure according to claim 1, wherein the pivot bearing part is formed. 3. The pivot bearing structure according to claim 2, wherein a spherical surface around the bottom is formed integrally with the resin member so as to be displaceable along an axial direction via a thin hinge. .