Multi-Part Damping Device for Injector Positioning and Vibration Control
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Solution Overview
Problem
Existing damping devices between a cylinder head and an injector in internal combustion engines face challenges in achieving precise positioning and maintaining dimensional stability due to high dimensional tolerances and elastic or plastic deformation, leading to impaired engine operation and increased noise and vibration.
Innovation Solution
A multi-part damping device design featuring a metal cushion with a wire mesh or metal foam structure, combined with inner and outer rings for precise positioning, effectively decouples the injector from the cylinder head while maintaining high damping efficiency and preventing wear, using a press fit connection and a gap seal to ensure precise alignment and prevent abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a voluminous damping element is used to achieve high damping effect, then damping performance is improved, but positioning precision deteriorates due to elastic or plastic deformation
Solution Approach 1:
The damping element is divided into multiple segments that can move independently relative to each other. This segmentation allows the damping element to accommodate dimensional variations and deformation without compromising the overall positioning precision, while maintaining sufficient damping volume.
Solution Approach 2:
The patent changes the material parameters by using a composite structure combining elastomeric material with reinforcement elements (metal mesh or fibers). This composite construction provides both the necessary damping properties and mechanical stability to maintain positioning precision over time.
2Loss of energy
If a damping element is used to decouple the injector from the cylinder head, then vibration damping is improved, but dimensional stability deteriorates
Solution Approach 1:
The damping element uses a composite material system combining elastomeric base material with reinforcement elements (metal mesh or plastic fibers). This composite structure provides both the elastic damping properties needed for vibration reduction and the mechanical stability required for dimensional consistency throughout the service life.
Solution Approach 2:
The damping element incorporates a porous or mesh-like internal structure that provides both damping capacity and structural rigidity. The porous configuration allows energy dissipation through friction and hysteresis while maintaining sufficient mechanical strength for dimensional stability.
3Loss of energy
If sufficient damping material is arranged between injector and cylinder head, then damping effect is improved, but device complexity increases
Solution Approach 1:
The damping element integrates multiple functions into a single component: damping, positioning, and sealing. By merging these functions, the patent avoids the need for separate damping elements, positioning fixtures, and sealing components, thereby reducing overall device complexity while maintaining effective damping.
Solution Approach 2:
The damping element is designed as a multi-functional component that simultaneously provides vibration damping, precise positioning of the injector, and sealing against the cylinder head. This universal design eliminates the need for multiple separate components, simplifying the overall assembly while achieving the required damping effect.
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 solution achieves effective vibration damping and precise injector positioning, maintaining small dimensional tolerances and preventing wear on the cylinder head, thereby enhancing engine operation and reducing noise and vibration, even at increased fuel pressures.
Implementation Method 1
In the metal cushion made of wire mesh, there is a very high level of energy dissipation due to the friction between the wires.
Implementation Method 2
The damping element (102) is made of an elastomeric material
Implementation Method 3
The damping element (102) is made of an elastomeric material, in particular of a thermoplastic elastomer
Implementation Method 4
The gap seal (113) is arranged at the outer surface (105) of the damping element (102) and serves for preventing particles, in particular abrasion, from reaching the damping element (102) and the combustion chamber
Data Source
Figure 1a~1b
Figure 2~3
Figure 4
AI summary
The invention relates to a damping device (100, 400), which is of multi-part design, for arranging in the region of an injector base (420) between a cylinder head (426) and an injector (422) which is mounted thereon, and to a damping element (402) which is designed as a metal cushion.