Motorcycle Frame Damping Unit for Vibration Suppression
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Solution Overview
Problem
Saddle-riding type automotive vehicles, such as motorcycles, experience vibrations from combustion engines that lead to abnormal noises, and modifying the vehicle body frame assembly to alter rigidity and mass can compromise the riding experience.
Innovation Solution
A damping unit is strategically placed in the vehicle body frame assembly to absorb vibratory energies from the combustion engine, using damping members or microparticulate impact dampers to convert these energies into heat or kinetic energy, thereby suppressing vibrations across a wide range of frequencies without altering the frame's rigidity or mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the design of the vehicle body frame assembly is modified to alter the rigidity and mass, then vibrations can be suppressed, but the feeling during traveling is lowered
Solution Approach 1:
The invention introduces a separate damping unit as an independent component attached to the vehicle body frame assembly, rather than modifying the frame itself. This segmentation allows vibration suppression functionality to be added without altering the original frame design, thereby maintaining the traveling feeling while suppressing vibrations at specific locations.
Solution Approach 2:
The damping unit acts as an intermediary element between the engine mounting area and the vehicle body frame assembly. It absorbs and dissipates vibratory energy transmitted through the frame, serving as a mediator that reduces harmful vibrations without requiring changes to the frame's structural properties that would affect traveling comfort.
2Object-generated harmful factors
If damping units are added to suppress vibrations, then abnormal noises are reduced, but device complexity increases
Solution Approach 1:
The damping unit is strategically positioned at specific locations on the vehicle body frame assembly where vibrations are most problematic, rather than modifying the entire frame structure. This localized approach effectively reduces abnormal noises while adding minimal complexity only where needed, preserving the overall simplicity of the vehicle design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces abnormal noises caused by vibrations while maintaining the original riding experience and design freedom, as the damping unit absorbs and attenuates displacements in the vehicle body frame assembly, providing a broad frequency vibration reduction without changing the frame's mass or rigidity.
Implementation Method 1
the vibratory energies from the combustion engine are absorbed and are then converted into heat energies of an internal friction of the damping member
Implementation Method 2
a damping unit is provided to absorb vibratory energies from the combustion engine to thereby suppress vibrations of the to-be-damped region
Data Source
AI summary
A motorcycle frame assembly (FR) for a motorcycle includes a main frame (1), which extends from above a combustion engine (E) in a direction rearwardly, and a subframe (4) having front and rear end portions connected with the main frame (1) and also having an intermediate portion positioned laterally outside of a cylinder block (26) of the combustion engine (E). The combustion engine (E) is fixed to a motorcycle frame assembly (FR) by means of first, second and third engine mounting areas (M1, M2, M3). The first engine mounting area (M1) is provided in the intermediate portion of the subframe (4) and, also, a damping unit (72) for suppressing vibrations of a to-be-damped region (76) is provided in the to-be-damped region (76) provided at a location remote from the first engine mounting area (M1) in the subframe (4).