High Pressure Pump Support Member Reduces Piston Friction
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Solution Overview
Problem
High pressure pumps experience fuel leakage and piston sticking issues due to increased pressure, which reduces discharge efficiency and stability during piston operation.
Innovation Solution
A high pressure pump design incorporating a support member with a cylindrical body and end supports to elastically secure the housing and cylinder, reducing friction and guiding piston reciprocation while preventing sticking and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the gap between the piston and the cylinder is reduced to prevent fuel leakage, then fuel leakage is reduced, but the risk of piston sticking to the cylinder increases
Solution Approach 1:
A support member is introduced as an intermediary component between the piston and the cylinder. This support member has a first end that contacts the piston and a second end that contacts the cylinder, thereby mediating the interaction between the piston and cylinder. The support member prevents direct contact between the piston and cylinder while maintaining a small gap, thus preventing both fuel leakage and piston sticking.
2Reliability
If the gap between the piston and the cylinder is increased to prevent piston sticking, then piston sticking is prevented, but fuel leakage through the gap increases
Solution Approach 1:
The support member acts as a mediator that allows for a larger gap between the piston and cylinder while preventing direct contact. The first end of the support member contacts the piston and the second end contacts the cylinder, maintaining proper spacing and preventing sticking, while the gap remains small enough to prevent excessive fuel leakage.
3Ease of operation
If lateral force is generated during piston operation, then piston reciprocation occurs, but the piston becomes stuck to one side of the cylinder
Solution Approach 1:
The support member serves as an intermediary that distributes lateral forces between the piston and cylinder. The first end contacts the piston to guide its reciprocation, while the second end contacts the cylinder to provide stable support. This intermediary structure prevents the piston from becoming stuck to one side of the cylinder during reciprocation.
Solution Approach 2:
The support member enables dynamic reciprocation of the piston while maintaining stable support. The first end of the support member moves with the piston during reciprocation, while the second end remains in contact with the cylinder, providing adaptive support that prevents sticking while allowing necessary motion.
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 fuel leakage and prevents piston sticking, enhancing the discharge efficiency and stability of the high pressure pump by minimizing friction and guiding piston movement.
Implementation Method 1
a support member seated on a stepped surface of the housing to surround the outside of the cylinder and configured to elastically support the housing and the cylinder
Data Source
AI summary
A high pressure pump includes a housing with a chamber formed inside and a flow control valve and a discharge check valve installed in the chamber; a piston installed to operate up and down in an assembly hall formed in the housing to compress fuel in the chamber to a high pressure; a cylinder forming a gap between an inner circumferential surface and the piston and guiding reciprocation of the piston; and a support member seated on a stepped surface of the housing to surround an outside of the cylinder and configured to elastically support the housing and the cylinder, thereby reducing friction while preventing fuel leakage between the piston and the cylinder.