Fuel Injector Suspension for Vibration Decoupling
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Solution Overview
Problem
Existing fuel injection systems for mixture-compressing internal combustion engines with externally supplied ignition suffer from noise issues due to vibration transmission from the fuel injector to the connection fitting, leading to structure-borne noise and vibrations, particularly in electromagnetic high-pressure injectors used in Otto engines with direct injection.
Innovation Solution
A suspension system that decouples the fuel injector from the fuel-carrying component using an elastically deformable element and an annular element, which supports the fuel fitting along the axis of the connecting body, providing a soft connection and reducing mechanical stress, thereby reducing noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid connection is used between the fuel injector and the fuel distributor, then mechanical stability and connection strength are improved, but vibrations and structure-borne noise are transmitted more strongly
Solution Approach 1:
The patent introduces a suspension system with an elastically deformable element as an intermediary between the fuel injector and the fuel distributor. This mediator element absorbs vibrations while maintaining the necessary connection, thus reducing structure-borne noise without compromising connection strength
Solution Approach 2:
The patent changes the mechanical parameters of the connection by using an elastically deformable element instead of a rigid connection. This allows the connection to have both strength and vibration-absorbing properties by utilizing the elastic properties of the material
2Object-generated harmful factors
If a soft suspension connection is used between the fuel injector and the fuel distributor, then vibration transmission and noise are reduced, but mechanical stability and connection reliability may be compromised
Solution Approach 1:
The patent carefully selects and designs the elastically deformable element to have specific mechanical properties that balance softness for vibration absorption with sufficient stiffness for reliable connection. The elastic modulus and geometric dimensions are optimized to maintain connection reliability while reducing noise
Solution Approach 2:
The suspension system uses composite construction combining the elastically deformable element with rigid components (connecting body and fuel injector housing). This composite approach allows each material to perform its optimal function - the elastic element for vibration absorption and the rigid parts for structural stability
3Object-generated harmful factors
If a complex suspension system with multiple components is used, then vibration decoupling and noise reduction are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent divides the suspension function into distinct components: the connecting body with receiving space, the elastically deformable element, and the annular element. This segmentation allows each component to be optimized independently and simplifies manufacturing and assembly
Solution Approach 2:
The annular element serves as an additional intermediary component that simplifies the overall suspension design by providing a straightforward mechanical interface between the fuel injector and the connecting body, reducing the need for more complex vibration isolation mechanisms
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 suspension system effectively reduces noise in the fuel injection system by decoupling vibrations, achieving a substantial noise reduction with minimal constructional adaptation, suitable for high-pressure fuel injectors and direct fuel injection applications.
Implementation Method 1
an elastically deformable element (22), which is arranged in such a way that it reduces vibrations between the fuel injector (7) and the fuel-carrying component (4)
Data Source
AI summary
A suspension for fuel injection systems is used for connecting a fuel injector to a fuel-carrying component. A connecting body having a receiving space is provided for this purpose. The connecting body has an opening, via which a fuel fitting of the fuel injector is insertible at least partially into the receiving space of the connecting body. Furthermore, an annular element and an elastically deformable element are provided. Fuel fitting is supported via the annular element and the elastically deformable element along an axis of the receiving space of the connecting body. A fuel injection system having such a suspension is also indicated. The suspension allows for a soft coupling of the fuel injector to the fuel-carrying component at a desired target stiffness.