Motorcycle Handle Bracket Vibration Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Motorcycles with separate left and right handles fixed directly to a handle crown experience vibration transmission from the engine and body frame, leading to rider fatigue during travel.
Innovation Solution
A motorcycle design featuring a steering handle mounted to a handle bracket connected via a damper member to the steering shaft, which absorbs vibrations and prevents their transmission to the handle bodies, along with features like joint bolts and height adjustment spacers for improved stiffness and maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate handle bodies are fixed directly to the handle crown, then the steering handle structure is simple, but vibrations from the engine and body frame are transmitted to the handle bodies causing rider fatigue
Solution Approach 1:
A handle bracket is introduced as an intermediary component between the steering shaft and the handle bodies. The handle bracket includes a lower bracket fixed to the steering shaft and an upper bracket that holds the handle bodies, with damper members positioned between them to absorb vibrations before they reach the handle bodies.
Solution Approach 2:
The harmful vibration transmission path is extracted and isolated from the handle bodies by positioning damper members between the lower bracket and upper bracket. This separates the vibration source from the handle bodies, preventing direct transmission while maintaining structural integrity.
2Stability of the object's composition
If damper members are arranged on left and right sides with handle bracket portion fixed to steering shaft interposed, then steering handle stiffness is improved, but if damper member is arranged at fixed region, handle bracket fluctuates and stiffness decreases
Solution Approach 1:
Different regions of the handle bracket are assigned different functions: the lower bracket region provides fixed connection to the steering shaft for structural stability, while the upper bracket region accommodates handle bodies with damper members for vibration isolation. This local differentiation optimizes both stiffness and vibration absorption.
Solution Approach 2:
The handle bracket is segmented into a lower bracket and an upper bracket, with the lower bracket fixed to the steering shaft and the upper bracket holding the handle bodies. This segmentation allows the lower portion to provide structural stiffness while the upper portion with damper members provides vibration isolation.
3Ease of manufacture
If handle bodies are fixed to upper ends of fork bodies with ring-shaped mount bosses, then mounting is straightforward, but detent construction is required to prevent turning
Solution Approach 1:
The detent construction is extracted and replaced by a friction-based fixation method. Joint bolts with threaded engagement and friction between contact surfaces prevent handle body turning without requiring mechanical detent elements, simplifying the overall structure.
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
The design significantly reduces rider fatigue by absorbing vibrations and enhancing steering stiffness and maneuverability, while also eliminating the need for additional harness fixation components.
Implementation Method 1
A handle bracket is connected to an upper end of the steering shaft through a damper member. The steering handle includes separate left and right handle bodies that are fixed to left and right ends of the handle bracket. With the motorcycle of the first embodiment, since the handle bracket is connected to the steering shaft through the damper member and the handle bodies are fixed to the handle bracket, vibrations from the engine and body frame are absorbed by the damper member and not transmitted to the handle bodies.
Data Source
AI summary
A motorcycle with reduced fatigue due to vibrations in travel. A handle bracket is connected to an upper end of a steering shaft through a damper member, and left and right handle bodies are fixed to left and right ends of the handle bracket.