High-Pressure Fuel Pump Adhesive Guiding Sleeve Connection
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Solution Overview
Problem
High-pressure fuel pumps face issues with deformations and internal leakage due to high assembly forces and settling behavior in positive-locking connections, leading to potential loss of function.
Innovation Solution
A materially engaging connection using an adhesive or weld connection between the guiding sleeve and housing, which is thermally stable and insoluble in fuels, providing a wear-resistant and sealed interface for the pump piston, reducing assembly forces and preventing deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a positive-locking connection is used to connect the guiding sleeve to the housing, then the connection strength is improved, but the assembly forces required increase significantly and cause component deformations
Solution Approach 1:
The patent replaces the mechanical positive-locking connection system with a chemically-based adhesive bonding system. The adhesive (40) creates a material engagement between the guiding sleeve (18) and housing (12) that eliminates the need for high assembly forces, while still providing sufficient connection strength to withstand operational loads.
Solution Approach 2:
The patent changes the fundamental parameter of connection methodology from mechanical interlocking to chemical bonding. By using an adhesive with appropriate bonding strength parameters, the connection achieves sufficient strength without requiring high assembly forces, thus resolving the contradiction between connection strength and assembly force requirements.
2Strength
If a positive-locking connection is used to connect the guiding sleeve to the housing, then the connection strength is improved, but component deformations occur leading to internal leakage paths
Solution Approach 1:
The adhesive bonding system replaces the mechanical positive-locking connection, eliminating the high assembly forces that cause deformations in valve seats and guiding sleeve. This substitution maintains connection strength while preserving the geometric integrity of sealing surfaces, thereby preventing internal leakage paths and ensuring sealing reliability.
Solution Approach 2:
The adhesive layer acts as a cushioning element that compensates for minor dimensional variations and prevents stress concentration that would lead to deformations. By distributing the bonding stresses evenly across the bonding surface, the adhesive prevents the formation of leakage paths before they can occur during operation.
3Stability of the object's composition
If a positive-locking connection is used to connect the guiding sleeve to the housing, then the initial connection stability is improved, but settling behavior occurs during operation leading to leakage paths
Solution Approach 1:
The adhesive bonding system replaces the mechanical positive-locking connection that is susceptible to settling behavior under vibrational and thermal loads. The adhesive creates a flexible yet stable bond that accommodates operational variations without losing connection integrity or creating leakage paths, thereby maintaining both connection stability and sealing reliability throughout the pump's operational life.
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 reduces component deformations and internal leakage, ensuring the high-pressure fuel pump's reliability and performance by using a thermally stable and fuel-resistant connection that acts as both a secure attachment and sealing mechanism.
Implementation Method 1
the materially engaging connection (38) has an adhesive connection (41) which comprises an adhesive (40)
Data Source
AI summary
The present disclosure relates to high-pressure fuel pumps and the teaching may be applied to pumps in which a pump piston, by means of which a fuel is acted on with a high pressure, is guided in a guiding sleeve. In some embodiments, a high-pressure fuel pump may include: a housing having a housing recess; a pump piston for pressurizing a fuel; and a guiding sleeve arranged in the housing recess and guiding the pump piston. The guiding sleeve is connected to the housing recess with a materially engaging connection.