Motorcycle Frame Head Pipe Bracket for Vibration Damping
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Solution Overview
Problem
Existing motorcycle vehicle body frames transmit torsion and vibrations from the front wheel to the vehicle body, necessitating increased rigidity throughout the frame and mounting areas, which is inefficient and may affect performance.
Innovation Solution
A motorcycle vehicle body frame design where the main frames and down frame extend rearward and downward from the head pipe at a steeper angle, with a bracket portion and reinforcing ribs to absorb lateral vibrations, allowing the head pipe to twist and reducing torsional forces, thus minimizing the need for increased rigidity and optimizing fuel tank placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the head pipe, main frames and down frame are firmly connected to form a truss, then the structural strength is improved, but torsion and vibrations from the front wheel are directly transmitted to the vehicle body frame
Solution Approach 1:
The patent divides the frame structure into separate components (head pipe, main frames, down frame) with distinct functions. The head pipe is segmented into a pipe portion and bracket portion, allowing independent movement and vibration absorption without compromising overall structural strength.
Solution Approach 2:
The bracket portion acts as an intermediary element between the head pipe and the main frames/down frame. It serves as a vibration-absorbing mediator that decouples the direct transmission of torsion and vibrations from the front wheel to the vehicle body frame while maintaining structural connection.
2Object-affected harmful factors
If the rigidity of the whole vehicle body frame is increased to suppress vibration transmission, then the harmful vibration transmission is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of increasing the rigidity of the entire vehicle body frame, the patent applies local quality by concentrating vibration absorption characteristics specifically at the bracket portion and head pipe interface. This localized approach reduces vibration transmission without requiring increased rigidity throughout the whole frame structure.
Solution Approach 2:
The patent changes the structural parameters of the head pipe by adding a bracket portion with specific geometric characteristics. This parameter modification enables the head pipe to absorb vibrations through controlled deformation rather than requiring increased overall frame rigidity.
3Strength
If the main frames are joined to the upper portion of the head pipe, then the structural strength is improved, but the fuel tank capacity is reduced due to limited space
Solution Approach 1:
The patent repositions the main frame mounting from the upper portion of the head pipe to the bracket portion located at a lower position. This spatial reconfiguration in the vertical dimension creates additional volume space for the fuel tank while maintaining adequate mounting strength through the bracket portion's structural design.
Data Source
AI summary
A head pipe includes a pipe portion and a bracket portion contiguously formed on a rear portion of the pipe portion wherein front end portions of the main frames and a front end portion of the down frame are jointed to the bracket portion. A widthwise center line of the main frames in the vertical direction is directed toward an intermediate portion of the pipe portion in the vertical direction in a side view. An upper surface extension line and a lower surface extension line on the extension in the frontward direction of an upper surface and a lower surface of the main frames pass between an upper end and a lower end of the pipe portion as viewed in a side view. The down frame is inclined to be directed towards the intermediate portion of the pipe portion in the vertical direction as viewed in a side view.