Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Nut – and means to engage substructure on its opposite faces...
Reexamination Certificate
2000-11-21
2003-03-25
Barrett, Suzanne Dino (Department: 3676)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Nut, and means to engage substructure on its opposite faces...
C411S107000
Reexamination Certificate
active
06537007
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a fastening structure for fastening a bolt to a flange by press-fitting a serration of the bolt into a bolthole of the flange.
There has conventionally been a mechanism as shown in
FIG. 4
, which adopts this kind of fastening structure. This structure is a structure for fastening a brake disk
103
and a wheel member
110
to a flange
102
of an inner ring member
105
by means of a bolt
101
and a nut
111
.
According to this fastening structure, the bolt
101
is fixed to the flange
102
by press-fitting a serration
106
formed on the bolt
101
into a bolthole
107
of the flange
102
. Then, the brake disk
103
and the wheel member
110
are fitted around this bolt
101
and fastened by means of the nut
111
.
However, in the aforementioned conventional fastening structure, as shown in
FIG. 3
, an inner peripheral surface
107
A of the bolthole
107
of the flange
102
is pressed by the serration
106
when the bolt
101
is press-fit into the flange
102
, so that the flange
102
is elastically deformed. Due to this elastic deformation, a flange surface
102
A on the bolt head side is deformed into a convex shape, while a flange surface
102
B on the opposite side is deformed into a concave shape.
As described above, if the flatness of the flange surfaces
102
A and
102
B are deteriorated, then the brake disk
103
cannot be mounted parallel to the flange surface
102
B. This leads to the problem that one-sided abutment of the brake disk
103
is caused, generating vibrations and abnormal noises.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention is to provide a fastening structure capable of preventing the deterioration in flatness of the flange surface when the serration of the bolt is press-fit into the flange.
In order to achieve the aforementioned object, the present invention provides a fastening structure including a bolt whose one portion in an axial direction of an outer peripheral surface is provided with a serration is press-fit into a bolthole formed in a flange portion of a mounting member.
A first distance between one axial end portion of the serration and one end surface of the flange portion exceeds 13% of a thickness in the axial direction of the flange portion, and a second distance between the other axial end portion of the serration and the other end surface of the flange portion exceeds 13% of the thickness in the axial direction of the flange portion.
According to the fastening structure of the present invention, the serration is located apart from the respective end surfaces of the flange portion by the first and second distances, and the first and second distances each exceed 13% of the thickness of the flange portion. With this arrangement, when the bolt is press-fit into the flange portion, the serration presses the bolthole inner peripheral surface only in a region far from both the end surfaces of the flange portion (in a region deeper than 13% of the thickness). In the regions close to the respective end surfaces of the flange portion (in each region shallower than 13% of the thickness), the serration does not press the bolthole inner peripheral surface.
By thus limiting the region where the serration of the bolt presses the bolthole inner peripheral surface to the region located far apart from both the end surfaces of the flange portion, the flange surface can be prevented from deteriorating in flatness when the serration is press-fit into the flange.
In an embodiment, a center portion in the axial direction of the serration substantially coincides with a center portion in the axial direction of thickness of the flange portion.
In this embodiment, the center portion in the axial direction of the serration is made to substantially coincide with the center portion in the direction of thickness of the flange portion. With this arrangement, the dimension in the axial direction of the serration can be maximized with the flatness of the flange surface maintained, thereby allowing its slip torque to be maximized.
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patent: 4975007 (1990-12-01), Molina
patent: 5266258 (1993-11-01), Martin
patent: 6174117 (2001-01-01), Kawatani et al.
patent: 6190102 (2001-02-01), Vignotto et al.
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patent: 2-217604 (1990-08-01), None
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patent: 10-89333 (1998-04-01), None
Ishii Tomohiro
Kawatani Teruyuki
Miyata Yasuhiro
Seo Nobuyuki
Barrett Suzanne Dino
Koyo Seiko Co. Ltd.
Wenderoth, LInd & Ponack, L.L.P.
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