Piezoactuator Reception Bush Pin Alignment
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Solution Overview
Problem
The existing reception bush for piezoactuators in internal combustion engine injectors often results in incorrect alignment of connection pins during assembly due to inadequate fixation, leading to potential electrical contacting issues.
Innovation Solution
The design incorporates guides for connection pins in one bush element and an anti-rotation device with a groove-spring connection to ensure correct alignment and angular positioning of bush elements, preventing tilting and axial movement of the pins, and allowing for easier assembly by compensating angular offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If connection pins are only fixed into through holes on one side, then assembly is simpler, but incorrect alignment and tilting of connection pins occur
Solution Approach 1:
The patent transitions from single-sided fixation to dual-sided guidance by adding guides in the second bush element. This dimensional extension from one side to both sides of the assembly ensures connection pins are constrained in multiple directions, preventing tilting while maintaining alignment precision without complicating the assembly process.
2Manufacturing precision
If guides are added for connection pins in the second bush element, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The guides for connection pins are integrated directly into the second bush element as a unified structure rather than separate components. This merging of the guide function into the existing bush element geometry achieves precise alignment without adding discrete parts or assembly steps, thereby avoiding increased device complexity.
3Ease of operation
If bush elements are joined by snap-on connection, then assembly is easier, but angular positioning precision deteriorates
Solution Approach 1:
The anti-rotation device is pre-configured in the first bush element before assembly, creating a predetermined angular position reference. This preliminary arrangement ensures that when the snap-on connection joins the bush elements, the correct angular positioning is automatically established without requiring precise manual alignment during assembly.
4Manufacturing precision
If anti-rotation device is added to retain angular position, then angular positioning precision is improved, but device complexity increases
Solution Approach 1:
The groove-spring connection serves dual functions: it provides the snap-on joining mechanism for easy assembly and simultaneously acts as an anti-rotation device to retain angular position. This multi-functionality eliminates the need for separate anti-rotation components, achieving precise angular positioning without increasing device complexity.
Data Source
AI summary
A reception bush for a piezoelectric actuator is provided with two connection pins for electrically bonding the piezoelectric actuator, in particular for a piezoelectric actuator controlling the injector of an injection system for an internal combustion engine. The reception bush has a first (1) and a second (2) bush elements which are interconnected when the bush is mounted. The first element (1) is provided with through holes (4, 5) for the connection pins of the inventive piezoelectric actuator. The second element (2) is provided with at least one guide (12) for the connection pins.