Bicycle frame structure

By dividing the downtube into left and right halves and combining it into a single frame design, the problems of low accuracy and output in the existing downtube bending design of downtube in electric bicycles are solved, efficient and low-cost manufacturing is achieved, and the installation flexibility of the electric device is improved.

JP7664675B1Active Publication Date: 2025-04-18SANKEI GIKEN KOGYO CO LTD
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Patent Information

Application Number
JP2023178835
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2023-10-17
Publication Date
2025-04-18
Estimated Expiration
2043-10-17

AI Technical Summary

Technical Problem

The downtube of existing electric bicycles is difficult to ensure product accuracy when bending design, resulting in low output and high manufacturing costs.

Method used

Using a single frame design, the downtube is divided into left and right halves, combined in the width direction, adding an upper extension and a horizontal part, and a fixing device of an electric device is set in the upper extension part, forming an integral downtube frame in this way.

Benefits of technology

With this design, the accuracy and strength of downtube can be ensured, manufacturing costs are reduced, output is improved, and installation flexibility of electric devices can be increased.

✦ Generated by Eureka AI based on patent content.

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Abstract

A bicycle frame structure is provided that can ensure the required product precision, ensure a high yield, and reduce manufacturing costs. [Solution] A bicycle frame structure having a down tube 3 bent in an L-shape when viewed from the side, with an upward extension portion 31 extending diagonally upward toward the head pipe 2, and a horizontal portion 33 extending approximately horizontally rearward from a bending portion 32 located near the position of the rider's feet, the down tube 3 being composed of a single frame formed by joining a pair of left and right halves 34, 35 to each other in the width direction, an engagement and retention stay 38 for an ECU 9 to be installed inside the down tube 3 is provided inside the upward extension portion 31, and an opening 353 for installing the ECU 9 inside the upward extension portion 31 is provided in the upward extension portion 31.
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Citation Information

Patent Citations

  • Frame of motorcycle

    JP1984077991A

  • Motor-driven bicycle

    JP2000238675A

  • Vehicle body frame for motorcycle

    JP2006281889A

  • Step arrangement structure in saddle-riding type vehicle

    JP2010284994A

  • Bicycle frame and electric bicycle having the same

    JP2016101914A