Elastic Stator Seat for Crankcase Vibration Damping
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Solution Overview
Problem
The challenge is to reduce magnetic noise in straddled vehicle engines while maintaining a lightweight design and avoiding layout restrictions, as increasing the thickness of the crankcase to enhance stiffness results in increased weight and reduced space for the power generator.
Innovation Solution
Incorporating an elastic material seat between the crankcase and the stator, which dampens minute vibrations and reduces magnetic noise, while maintaining the crankcase's thickness and ensuring the power generator's layout is not compromised.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of the sidewall of the crankcase is increased to enhance stiffness, then magnetic noise is reduced, but weight of the engine increases
Solution Approach 1:
A vibration damping member is introduced as an intermediary component between the crankcase and the stator. This member absorbs and dampens vibrations transmitted from the rotating crankcase to the stator, thereby reducing magnetic noise without requiring increased crankcase thickness. The damping member acts as a mediator that isolates the stator from harmful vibrations while maintaining the original lightweight crankcase structure.
Solution Approach 2:
The invention changes the physical state and properties of the interface between the crankcase and stator by introducing a viscoelastic damping material. This material exhibits temperature-dependent and frequency-dependent damping characteristics, optimizing vibration absorption across different operating conditions. The parameter change from rigid connection to viscoelastic coupling reduces magnetic noise without increasing structural mass.
2Object-affected harmful factors
If the thickness of the sidewall of the crankcase is increased to enhance stiffness, then magnetic noise is reduced, but space for accommodating the power generator decreases
Solution Approach 1:
The vibration damping member serves as a thin intermediary layer between the crankcase and stator, providing effective vibration isolation without occupying significant space. This allows the power generator to be accommodated in the original design space without modifications to the crankcase thickness, thereby avoiding layout restrictions while still reducing magnetic noise.
3Object-affected harmful factors
If the thickness of the sidewall of the crankcase is increased to enhance stiffness, then magnetic noise is reduced, but complexity of the structure increases
Solution Approach 1:
The vibration damping member is designed as a simple planar component that can be easily positioned and secured between the crankcase and stator using existing fastening structures. This approach avoids complex structural modifications while effectively addressing magnetic noise through material-based vibration damping rather than geometric structural changes.
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 inhibits magnetic noise generation, prevents weight increase, and maintains the power generator's layout integrity by using an elastic material seat that enhances durability and positional precision.
Implementation Method 1
The seat, at least in part, is made of elastic material. The seat is interposed between the crankcase and the stator, while being pressed by the crankcase and the stator.
Implementation Method 2
the seat is disposed between the crankcase and the stator, and at least in part, is made of elastic material. Therefore, minute vibrations of the crankcase can be inhibited by the seat in driving the power generator.
Data Source
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AI summary
A first shaft portion of a crankshaft is disposed inside a crankcase. A second shaft portion of the crankshaft protrudes from the crankcase. A power generator includes a rotor and a stator. The rotor is fixed to the second shaft portion. The stator includes a hole through which the second shaft portion is inserted, and is fixed to the crankcase. A seat is disposed between the crankcase and the stator. The seat, at least in part, is made of elastic material. The seat is interposed between the crankcase and the stator, while being pressed by the crankcase and the stator.