Fuel Injection Valve Support Structure for Rotational Vibration Control

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Solution Overview

Problem

Conventional fuel injection valve supporting structures are prone to axial movement and rotational vibration due to engine vibrations, affecting fuel injection direction and combustion efficiency.

Innovation Solution

A supporting member with a base plate, elastic pieces, and turn stopper pieces is used, where the base plate contacts a first contact surface and the elastic pieces press against the fuel supply cap, while the turn stopper pieces contact second contact surfaces to prevent axial movement and rotational vibration, stabilizing the fuel injection valve.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a U-shaped plate spring is used as a supporting member, then the fuel injection valve can be biased toward the injection valve attachment hole, but the fuel injection valve is likely to turn about its center axis due to engine vibration

Engineering Contradiction:

Improveposition stability of fuel injection valveVSAvoidrotational vibration caused by engine vibration

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The supporting member is divided into multiple functional components: a base plate for positioning, elastic pieces for axial biasing, and turn stopper pieces for rotational constraint. This segmentation allows each component to address specific stability issues independently, preventing both axial movement and rotational vibration of the fuel injection valve.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The turn stopper pieces act as intermediary elements between the fuel injection valve and the supporting structure. These pieces contact the second contact surfaces on the fuel injection valve to prevent turning about the center axis, while the elastic pieces provide the necessary biasing force through the base plate.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the fuel injection valve is allowed to move freely, then assembly is easier, but the direction of fuel injection changes due to valve turning

Engineering Contradiction:

Improveassembly easeVSAvoidfuel injection direction precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The supporting member is pre-assembled with the base plate, elastic pieces, and turn stopper pieces in a predetermined configuration before installation. This preliminary assembly ensures that when the fuel injection valve is installed, it is immediately constrained in both axial and rotational directions, maintaining precise fuel injection direction without requiring complex adjustment procedures.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If a simple supporting member is used, then device complexity is reduced, but the fuel injection valve cannot be stabilized against rotational vibration

Engineering Contradiction:

Improvesupporting member structure complexityVSAvoidfuel injection stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The supporting member is designed as a multi-functional component that simultaneously provides axial positioning (through the base plate and elastic pieces) and rotational constraint (through the turn stopper pieces). This multi-functionality is achieved within a single integrated structure, avoiding the need for multiple separate components and maintaining relatively low device complexity while ensuring reliable fuel injection stability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 effectively prevents axial movement and rotational vibration of the fuel injection valve, ensuring stable fuel injection direction and improved combustion efficiency by using a combination of elastic and turn stopper pieces to secure the valve in place.

Implementation Method 1

an elastic piece extending from the base plate to elastically come into pressure contact with the fuel supply cap and bias the fuel injection valve toward the injection valve attachment hole by means of reaction force produced by the pressure contact

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

each turn stopper piece extending from the base plate to come into contact with the second contact surface and restrict a turn of the fuel injection valve about the center axis

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS9032934B2Fuel injection valve supporting structure

Publication Date: 2015.05.19 ASTEMO LTD

AI summary

In a fuel injection valve supporting structure, a first contact surface being orthogonal to a center axis of a fuel injection valve and opposed to a fuel supply cap and paired second contact surfaces opposed to each other with a plane, including the center axis and a center line of a coupler, in between are formed in an intermediate portion of the fuel injection valve, and a supporting member includes: a base plate set on the first contact surface; an elastic piece extending from the base plate to elastically come into pressure contact with the fuel supply cap and bias the fuel injection valve toward an injection valve attachment hole by its reaction force; and paired turn stopper pieces each extending from the base plate to abut against the second contact surface and restrict a turn of the fuel injection valve about the center axis.