Engine Fuel Injection Valve Installation Structure Vibration Damping
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Solution Overview
Problem
Existing fuel injection valve installation structures in engines suffer from operational noise due to vibration, which requires additional countermeasures like sound insulation, increasing complexity and cost, especially in applications like motorcycles where aesthetics and cooling are affected.
Innovation Solution
Incorporating a first and second damper means with high vibration damping properties between the fuel injection valve and engine component members, utilizing a combination of damper members with different damping properties and a sliding member to facilitate smooth movement, and a wave washer with adjustable spring force to absorb return vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fuel injection valve is directly held between the cylinder head and head cover, then the assembly is simple, but the operational noise due to vibration is emitted to the outside
Solution Approach 1:
The patent introduces damper means as intermediary elements between the fuel injection valve and the engine components. These dampers act as mediators that absorb vibration and reduce noise transmission, resolving the contradiction by adding a specialized component that addresses the harmful vibration emission without complicating the basic assembly structure
2Object-generated harmful factors
If a sound insulation cover is added to reduce noise, then the operational noise is reduced, but the appearance and cooling capability are affected
Solution Approach 1:
The patent extracts the noise reduction function from external sound insulation covers and relocates it to integrated damper means within the installation hole structure. This eliminates the need for separate sound insulation covers that would affect appearance and cooling, while still achieving noise reduction through the damper's vibration absorption capabilities
3Object-generated harmful factors
If damper means are added to reduce vibration, then the operational noise is reduced, but the assembly complexity increases
Solution Approach 1:
The patent merges the damper means with the existing installation hole structure in the cylinder head. By integrating the vibration damping function into the existing structural framework rather than adding completely separate components, the assembly complexity increase is minimized while still achieving effective vibration reduction
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
Effectively reduces operational noise and vibration transmission, simplifies assembly, and prevents heat transfer from the cylinder head to the fuel injection valve, thereby reducing noise and temperature rise.
Implementation Method 1
a first damper means with a high vibration damping property is set between the annular shoulder portion and the fuel injection valve. In addition, a second damper means with a high vibration damping property is set between the supporting member and the fuel injection valve
Implementation Method 2
a wave washer with a spring force being set lower than that of the rubber
Implementation Method 3
at least a part of the damper member that the second damper means has that is made of a rubber
Implementation Method 4
A sliding member is attached to the supporting member, and guides the sliding movement of the damper holder in the axial directions of the installation hole against the supporting member
Data Source
AI summary
To effectively reduce operational noise generated by vibration of the fuel injection valve with a fuel injection valve installation structure of an engine. In the structure, an installation hole is formed in an engine component member that constitutes a part of an engine. The installation hole has an annular shoulder portion, which is formed in the middle portion thereof, and which faces the exterior side. The fuel injection valve is held between the annular shoulder portion and a supporting member attached to the engine component member. A first damper, with high vibration-damping properties, is set between an annular shoulder portion and a fuel injection valve. A second damper, with high vibration-damping quality, is set between a supporting member and the fuel injection valve.