Relief Valve Mechanism Inversion for High-Pressure Fuel Pump
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Solution Overview
Problem
The relief valve mechanism in high-pressure fuel supply pumps is prone to detachment due to differential pressure, leading to potential fuel leaks and reliability issues, as the force exerted on the mechanism is opposite to its insertion direction, causing stress on the welding portion and increasing the risk of detachment.
Innovation Solution
Improving the insertion direction and restriction of the relief valve mechanism to ensure it remains securely fixed, aligning the force direction with the insertion direction and using a seal structure that enhances the reliability and prevents detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the relief valve mechanism is inserted from the upstream side to the downstream side of the discharge valve, then the relief valve mechanism can be installed in the conventional orientation, but the differential pressure exerts a force in the opposite direction to the insertion direction, causing the relief valve mechanism to detach and the welding portion to be destroyed
Solution Approach 1:
The relief valve mechanism is inverted by inserting it from the downstream side to the upstream side of the discharge valve, opposite to the conventional insertion direction. This inversion changes the direction of the differential pressure force to align with the insertion direction, preventing detachment and destroying the welding portion.
2Strength
If the relief valve mechanism is fixed with a welding portion, then the mechanism can be securely attached, but the differential pressure force applied in the opposite direction to the insertion direction increases the likelihood of the welding portion being destroyed
Solution Approach 1:
By inverting the insertion direction of the relief valve mechanism from downstream to upstream, the differential pressure force that previously acted against the welding portion now acts in favor of securing the welding portion, preventing its destruction while maintaining strong attachment.
3Reliability
If the relief valve mechanism is inserted from downstream to upstream of the discharge valve, then the differential pressure force aligns with the insertion direction preventing detachment, but the insertion direction is opposite to the conventional orientation
Solution Approach 1:
The relief valve mechanism is inserted from the downstream side to the upstream side of the discharge valve, inverting the conventional insertion direction. This inversion aligns the differential pressure force with the insertion direction, ensuring the relief valve mechanism remains securely attached and preventing detachment.
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 enhanced relief valve mechanism improves the reliability by ensuring it remains securely in place, preventing fuel leaks and maintaining the integrity of the fuel supply system.
Implementation Method 1
a force for pushing out the relief valve mechanism is exerted in a direction opposite to the outlet side of the relief valve mechanism (upstream of the discharge valve)
Data Source
AI summary
A fuel pump includes an electromagnetically driven intake valve mechanism, a pump housing, a discharge valve, an opening, a seal member, and a first relief passage. The relief valve mechanism has a relief valve, a relief valve seat contacting the relief valve when the relief valve is closed and a relief spring biasing the relief valve against the relief valve seat. A second relief passage, communicating the first relief passage and a hole formed in the relief seat, is formed between the seal member and the relief valve seat. The relief valve seat, the relief valve, and the relief spring are arranged in this order beginning from the open end side.