Motor vehicles – Special wheel base – Having only two wheels
Reexamination Certificate
1999-09-10
2001-09-18
DePumpo, Daniel G. (Department: 3611)
Motor vehicles
Special wheel base
Having only two wheels
C280S274000, C280S281100, C280S781000
Reexamination Certificate
active
06290015
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an attaching structure for a rear cushion bracket in a motorcycle.
2. Description of Related Art
It is known to attach a rear cushion bracket to a rear portion of a hollow vehicle body frame by welding (as an example, refer to JP-A-10-71981).
In general, a known rear cushion bracket has a wall thickness thicker than a wall thickness of the vehicle body frame. When the rear cushion bracket is directly welded to the vehicle body frame, stresses are caused on the side of the vehicle frame due to a difference in the wall thickness. Therefore, deformation of the vehicle body frame and/or the cushion bracket occurs. In order to avoid this phenomenon, as in the conventional example, the cushion bracket is welded to a patch plate having a wall thickness substantially equal to that of the vehicle body frame and thereafter, the patch plate is welded to the vehicle body frame.
However, in such a case, the number of parts and the number of steps of welding are increased. Accordingly, if possible, it is desired to dispense with such a patch plate.
Furthermore, although it is conceivable to thicken the wall thickness of the vehicle body frame to a degree the same as that of the cushion bracket, it is not advisable since in such a case, the total weight of the vehicle body is increased.
SUMMARY OF THE INVENTION
In order to resolve the above-described problem, according to the present invention, there is provided an attaching structure for a rear cushion bracket wherein a motorcycle has a rear cushion bracket attached to a rear portion of a hollow vehicle body frame by welding. A wall thickness of the rear cushion bracket and a wall thickness of the vehicle body frame on a counterpart side are partially and respectively adjusted such that a wall thickness of a weld portion of the rear cushion bracket and a wall thickness of a weld portion of the vehicle body frame are substantially equal to each other.
According to the present invention, the wall thickness of the vehicle body frame and the cushion bracket are partially and respectively adjusted such that the wall thickness of the respective weld portions thereof becomes substantially equal to each other. Accordingly, deformation on the side of the vehicle body frame can be avoided even when the cushion bracket is welded to the vehicle body frame. Furthermore, only a portion of the vehicle body frame to be welded with the rear cushion bracket is thickened. Other portions of the vehicle body frame can be thinned more than the weld portion.
In view of this, the total weight of the motorcycle can be made as light as possible, and the need for a patch plate can be dispensed with. Therefore, the number of parts and the number of steps of welding can be reduced.
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: 4735355 (1988-04-01), Browning
patent: 5423564 (1995-06-01), Harvey
patent: 5557961 (1996-09-01), Ni et al.
patent: 5826899 (1998-10-01), Klein et al.
patent: 5897139 (1999-04-01), Aloe et al.
patent: 5915727 (1999-06-01), Bonnville
patent: 6050474 (2000-04-01), Aota et al.
patent: 6058865 (2000-05-01), Thibeault
patent: A10-71981 (1998-03-01), None
Horii Yoshiyuki
Matsuno Toshio
Birch & Stewart Kolasch & Birch, LLP
DePumpo Daniel G.
Honda Giken Kogyo Kabushiki Kaisha
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