Motor vehicles – Special wheel base – Having only two wheels
Reexamination Certificate
2001-02-23
2003-02-11
DePumpo, Daniel G. (Department: 3611)
Motor vehicles
Special wheel base
Having only two wheels
C180S219000, C180S385000, C464S073000, C464S081000
Reexamination Certificate
active
06516912
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a power transmission mechanism for a motorcycle. In particular, the present invention relates to a mechanism in which an elastic member is interposed between a driven flange and a wheel.
2. Description of Background Art
In a power transmission mechanism for a shaft driving system, if rapid variations in the rotation of a driving shaft or a wheel are transmitted to each other, riding comfort is impaired. To overcome this deterioration in riding comfort, a mechanism in which an elastic member is disposed between a driven flange rotated by a driving shaft and a wheel is disclosed in Japanese Examined Utility Model Publication No. 5-44599 or Japanese Unexamined Utility Model Publication No. 58-116887.
Referring to
FIGS. 6 and 7
of the present invention, the above-mentioned conventional mechanism of the above documents will be described. A recess
102
is shaped like a fan when viewed from the side. The recess
102
is formed in a wheel
101
which is rotatably mounted on a rear axle
100
. A damper rubber
103
is fitted in the recess
102
. Furthermore, a metal collar
104
is fitted in the center of the damper rubber
103
.
In addition, a driven flange
106
is spline-fitted in a final gear
105
to which power is transmitted from an engine and a pin
107
which is fixed in the driven flange
106
is inserted into the metal collar
104
. Accordingly, the rotation of the driven flange
106
is transmitted to the wheel
101
via the damper rubber
103
.
In the above-mentioned conventional mechanism, clearance must be provided between the pin
107
and the metal collar
104
in order to insert the pin
107
into the metal collar
104
. Furthermore, since the driven flange
106
is freely movable in the direction of the rear axle
100
, the driven flange
106
tends to move in the direction shown by an arrow in
FIG. 6
when it is rotated. Therefore, in the conventional mechanism, there is a possibility that the pin
107
comes into contact with the metal collar
104
. Accordingly, undesirable wear and sound is produced.
SUMMARY OF THE INVENTION
In order to solve the above problem, the present invention provides a power transmission mechanism for a motorcycle in which an elastic member is fitted in a recess formed in a wheel and a driven flange is connected to the elastic member to transmit power from an engine to the wheel via the elastic members, wherein the driven flange is divided into an engine side flange formed of a highly rigid material such as steel and a wheel side flange formed of a light material such as aluminum, and wherein the engine side flange is integrally connected to the wheel side flange with a fastening member.
While elastic members are provided with metal collars and driven flange side pins are inserted into the collars in a conventional power transmission mechanism for a motorcycle, in the power transmission mechanism in accordance with the present invention, the elastic members are not provided with metal collars and hence the pins do not contact the metal collars as is the case with the conventional power transmission mechanism.
A power transmission mechanism for a motorcycle in accordance with the present invention is suitable for a power transmission mechanism employing a driving shaft. In this case, power from the engine is transmitted to a final gear via a driving shaft and bevel gears and the above engine side flange is spline-fitted in the final gear.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 1790614 (1931-01-01), Liepert
patent: 3636729 (1972-01-01), Patel
patent: 3747720 (1973-07-01), Jensen
patent: 4328879 (1982-05-01), Tone
patent: 4436173 (1984-03-01), Takahashi
patent: 4794998 (1989-01-01), Iwai et al.
patent: 179720 (1954-02-01), None
patent: 2158195 (1985-11-01), None
patent: 58116887 (1983-08-01), None
patent: 544599 (1993-11-01), None
Ito Shinji
Iwai Toshiyuki
Birch & Stewart Kolasch & Birch, LLP
DePumpo Daniel G.
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