Generator Crankshaft Orientation for Vibration Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Engine-driven working machines face challenges in suppressing vibration and securing output power due to limited space for vibration absorption and complex intake and exhaust passage configurations, which hinder their merchantability and performance.
Innovation Solution
The engine is housed in an outer case with a crankshaft disposed to intersect the case, allowing for lateral orientation and larger spaces for vibration absorption, with the intake and exhaust ports aligned to simplify carburetor and muffler placement, reducing flow resistances and enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the crankshaft is disposed along the longitudinal direction of the outer case, then the cooling air can flow rectilinearly and pressure loss is decreased, but the width dimension is suppressed and it becomes difficult to secure large space for vibration absorption
Solution Approach 1:
The crankshaft is reoriented from the longitudinal direction to the lateral direction of the outer case. This dimensional change in crankshaft orientation allows the cooling air passage to maintain its efficiency while creating sufficient width space between rubber support portions for vibration absorption.
2Ease of manufacture
If the carburetor, air cleaner and muffler are disposed at the intake valve side and exhaust valve side respectively, then the width dimension increases, but the intake passage and exhaust passage become complicated and flow resistances increase
Solution Approach 1:
By changing the crankshaft orientation to lateral direction, the intake and exhaust ports are repositioned accordingly. This allows the carburetor and muffler to be disposed in locations that simplify the intake and exhaust passages, reducing flow resistances while avoiding width dimension increase.
3Volume of moving object
If the crankshaft is disposed along the longitudinal direction, then the engine can be compactly arranged, but vibration occurs in the width direction and it is difficult to suppress vibration with limited space
Solution Approach 1:
The crankshaft is reoriented from longitudinal to lateral direction, which changes the vibration direction from width direction to longitudinal direction. This allows rubber support portions to effectively suppress vibration by providing adequate spacing in the width direction while maintaining compact engine arrangement.
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 configuration effectively suppresses vibration, enhances merchantability, and secures engine output power by simplifying passage configurations and improving cooling efficiency, resulting in a slim and efficient engine-driven working machine.
Implementation Method 1
the engine is supported by rubber support portions... it is difficult to suppress the vibration of the engine-driven working machine by the rubber support portions
Data Source
AI summary
An engine-driven working machine capable of suppressing vibration, and further securing output power of an engine is provided. An engine-driven working machine 10 is a generator in which an outer case 12 is formed to be substantially rectangular in plan view that extends in a longitudinal direction, and an engine 15 is housed in an inside 13 of the outer case 12. In the generator 10, a crankshaft 41 is disposed to intersect the longitudinal direction of the outer case 12. Further, an intake port 44 and an exhaust port 45 are disposed in the longitudinal direction of the outer case 12. Furthermore, a carburetor 61 is disposed at a side of the intake port 44, and a muffler 67 is disposed at a side of the exhaust port 45.