Sound-Insulating Housing for Engine Work Machine Noise Reduction
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Solution Overview
Problem
Conventional engine-driven work machines struggle to effectively insulate sound emitted from duct members, leading to inadequate silencing performance.
Innovation Solution
The integration of a sound-insulating housing between the intake and muffler boxes, along with a through-bore in the duct member for ventilation and air leakage, which directs cooling air to the carburetor and includes a fuel tank as a ceiling wall for enhanced sound isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sound-insulating housing is added to surround the duct member, then sound insulation performance is improved, but device complexity increases
Solution Approach 1:
The sound-insulating housing is merged with the existing intake box and muffler box to form an integrated silencing structure. The housing connects between these two boxes and surrounds the duct member, combining noise insulation functionality with the existing air intake and exhaust system without requiring completely separate components.
Solution Approach 2:
The sound-insulating housing serves multiple functions: it insulates sound from the duct member, maintains pressure within the housing through the through-bore ventilation, and prevents overheating and icing by directing cooling air to the carburetor. This multi-functionality reduces the need for additional separate components.
2Reliability
If cooling air is leaked through the through-bore to the sound-insulating housing, then ventilation and pressure maintenance are improved, but cooling air flow is reduced
Solution Approach 1:
The through-bore is positioned specifically in the duct member to allow controlled leakage of cooling air to the sound-insulating housing. This localized opening provides ventilation and pressure maintenance while minimizing the impact on overall cooling air flow to the engine.
Solution Approach 2:
The sound-insulating housing acts as an intermediary chamber that receives leaked cooling air through the through-bore and redirects it to the carburetor. This intermediary structure allows the system to utilize the leaked air for preventing overheating and icing without significantly reducing the main cooling air flow.
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 significantly improves the silencing performance by effectively absorbing sound emissions and maintaining pressure within the sound-insulating housing while preventing overheating and icing, thus enhancing noise reduction and operational efficiency.
Implementation Method 1
A sound-insulating housing is connected between the intake box and the muffler box to surround the duct member in order to insulate sound emitted from the duct member
Implementation Method 2
A cooling fan is disposed in the cooling-air passage to generate cooling air flowing from one end of the cooling-air passage to the other end during operation of the engine
Implementation Method 3
the duct member is provided with a through-bore which permits cool air to leak from the cooling-air passage to the sound-insulating housing
Data Source
AI summary
A duct member is disposed around outer peripheries of an engine and an engine-driven generator to define a continuous cooling-air passage between the duct member and the outer peripheries. A cooling fan is disposed in the cooling-air passage to generate a flow of cooling air from one end of the cooling-air passage to the other end during operation of the engine. An intake box is connected to one end of the cooling-air passage and has an air-intake port. A muffler box is connected to the other end of the cooling-air passage, has an air-discharge port, and accommodates an exhaust muffler of the engine. A sound-insulating housing is connected between the intake box and the muffler box to surround the duct member in order to insulate sound emitted from the duct member.