Fuel Injection Lever Device Rotational Fixation
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Solution Overview
Problem
Existing injection valves for internal combustion engines face reliability issues due to rotational movements of lever elements, which can lead to inconsistent injection quantities and reduced service life.
Innovation Solution
A lever device with a housing, lever elements, and a drive element, where the lever elements are coupled in a rotationally fixed manner to prevent rotational movement, ensuring reliable positioning and operation. This is achieved through planar wall sections interacting with each other or with the housing, providing a stable coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lever element is allowed to rotate relative to the output element, then the device complexity is reduced and ease of manufacture is improved, but the reliability deteriorates due to inconsistent injection quantities
Solution Approach 1:
The coupling section is divided into two planar wall sections: one on the lever element and one on the output element. This segmentation allows each component to maintain its functional simplicity while the interaction between the two planar sections prevents rotational movement, thereby resolving the contradiction between reliability and device complexity.
2Reliability
If the lever element is rotationally fixed to the output element, then the reliability is improved by preventing rotational movement, but the manufacturing precision requirements increase
Solution Approach 1:
The coupling mechanism changes the parameter of rotational freedom to rotational fixation through the interaction of two planar wall sections. This parameter change ensures reliable operational positioning while the planar geometry allows for straightforward manufacturing processes that can achieve the required precision without excessive complexity.
3Reliability
If a pin-and-recess coupling is used to prevent rotation, then the reliability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
Instead of using a traditional pin-and-recess coupling where a protruding pin fits into a recess, the invention inverts the approach by using two planar wall sections that interact to prevent rotation. This inverted coupling method achieves the same rotational fixation function while being simpler to manufacture and assemble.
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 ensures a permanently reliable operation of the injection valve by preventing rotational movements, maintaining consistent injection conditions over many cycles and extending the service life of the injector.
Implementation Method 1
Such actuators have a piezoceramic material. Such actuators can change their length depending on an electrical field that acts in the piezoceramic material.
Data Source
AI summary
The invention relates to a lever device (28) for a fuel injection valve, comprising a housing (12) with a housing recess (14), at least one lever element (30) arranged in said housing recess (14), a drive element (26) arranged in the housing recess (14) and coupled to the at least one lever element (30) in order to act upon said at least one lever element in the direction of a force-action axis (A), and an output element (32) arranged in the housing recess (14) and coupled to said at least one lever element (30) such that this output element (32) may be moved in the force-action axis (A) direction by means of the at least one lever element (30). This at least one lever element (30) comprises a coupling section (34) that is designed or arranged in such a manner that said at least one lever element (30) is coupled to the housing (12), or to the output element (32), in a rotationally-fixed manner with respect to the force-action axis (A).