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Automatic bicycle

A technology for automatic two-wheeled vehicles and pipes, applied to bicycles, motor vehicles, bicycle racks, etc., can solve the problems of reduced riding comfort, achieve the effects of improving riding comfort, increasing productivity, and reducing costs

Inactive Publication Date: 2006-09-06
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, in the main pipe, in order to close the opening formed by cutting, the components of the body frame are welded, so the rigidity of the rear half of the main pipe becomes large, and there is a possibility that the rigidity of the whole main pipe becomes too high, and the riding Difficulty with reduced comfort

Method used

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Embodiment Construction

[0037] Below, refer to Figure 1- Figure 25 Examples of the present invention will be described.

[0038] 1 to 10 show a first embodiment of the present invention, and Fig. 1 is a schematic left side view of a motorcycle V according to the present invention. In the motorcycle V, a handle 3 is provided at the upper end of a front fork 2 rotatably supported by a head pipe 1 , and a front wheel 4 is pivotally supported at the lower end thereof. A pair of left and right main pipes 5 whose front ends are connected to the head pipe 1 extend left and right while extending diagonally downward from the rear of the vehicle body in a bilaterally symmetrical manner, and are connected near the rear end by a cross pipe (not shown). . A pair of left and right pivot plates 6 are respectively connected to the rear ends of the two main pipes 5, and on the pivot 7 supported by the two pivot plates 6, the rear fork pivoting the rear wheel 9 is supported freely swinging up and down. 8. The fro...

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Abstract

The objective is to reduce the cost of a motorcycle, and to improve its ride quality by using an extruded head pipe having different rigidity in the longitudinal direction. This motorcycle is provided with a main pipe formed of a tubular member 20 and having a front end forming a connection part to the head pipe. The tubular member 20 is formed by integrally extruding a tubular wall 21 with connection walls 22 and 23 to connect tubular wall parts 21c and 21d facing each other in an inner space. A front part including the connection part of the main pipe is formed of a tubular part 24 having the connection walls 22 and 23, and at least a part of the rear part of the main pipe is formed of a tubular part 25 having no connection wall.

Description

technical field [0001] The present invention relates to a two-wheeled motorcycle provided with a main pipe made of a pipe material having a special-shaped cross section and a connection portion with a head pipe at the front end. Background technique [0002] As a prior art of this type, there is known a two-wheeled motorcycle provided with a body frame disclosed in JP-A-9-254854. The body frame is provided with a head pipe and a pair of left and right aluminum main pipes extending obliquely downward from the head pipe. The main pipe, which is formed by extrusion molding and has a vertically elongated "Japanese" cross-sectional shape, is tapered toward the rear, and its rear lower part is cut obliquely at a shallow angle to form the front half. In the shape of a tapered tube with a larger cross-sectional area than the rear half, the opening formed by cutting is welded to body frame components such as an engine suspension bracket to close the opening. Furthermore, both weigh...

Claims

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Application Information

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IPC IPC(8): B62K11/02B21C25/08B62K19/06
Inventor 柳桥善隆星好
Owner HONDA MOTOR CO LTD
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