Relief Valve Lift Control for Stable High-Pressure Pump Operation
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Solution Overview
Problem
Conventional relief valve devices experience variations in valve lift amount and reliability issues due to the dual functions of the biasing-force-adjusting member, which can lead to damage and unintended changes in biasing force, especially in high-pressure applications like direct injection engines.
Innovation Solution
The relief valve device incorporates a separate regulating member to precisely control the valve lift amount, while the biasing-force-adjusting member only adjusts the biasing force, preventing contact and potential damage from the valve member's movement, thus ensuring consistent valve opening pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the biasing-force-adjusting member is used to adjust the biasing force of the spring, then the biasing force can be adapted to spring characteristic variations, but the lift amount of the valve member varies and the spring may be damaged due to unexpected large stroke
Solution Approach 1:
The patent divides the previously combined biasing-force-adjusting member into two separate components: a biasing-force-adjusting member that only adjusts spring biasing force, and a regulating member that separately controls valve member lift amount. This segmentation allows independent adjustment of biasing force and lift amount, preventing the reliability issues caused by the dual-function design where adjusting biasing force inadvertently changed lift amount and caused spring damage.
2Device complexity
If the biasing-force-adjusting member has dual functions of adjusting biasing force and regulating lift amount, then device complexity is reduced, but the valve member may collide with and damage the biasing-force-adjusting member at high relief pressures
Solution Approach 1:
The patent separates the regulating function from the biasing-force-adjusting member, creating a dedicated regulating member that controls valve member movement. This prevents the valve member from colliding with and damaging the biasing-force-adjusting member during high-pressure operation, as the regulating member acts as a protective barrier that limits valve member travel before it can reach the biasing-force-adjusting member.
Solution Approach 2:
The regulating member serves as an intermediary component between the valve member and the biasing-force-adjusting member. It controls and limits the movement of the valve member in the valve opening direction, preventing direct contact and potential damage between the valve member and the biasing-force-adjusting member during high-pressure relief operations.
3Adaptability or versatility
If the position of the biasing-force-adjusting member is adjusted to adapt to spring variations, then biasing force adjustment is achieved, but the lift amount of the valve member varies unintentionally
Solution Approach 1:
The patent separates the adjustment functions into two independent components: the biasing-force-adjusting member that adjusts spring biasing force, and the regulating member that precisely controls valve member lift amount. This allows the biasing force to be adjusted to adapt to spring variations without affecting the precision of the valve lift amount, as the regulating member independently controls the valve member's movement distance.
Solution Approach 2:
The patent applies different functional qualities to different components: the biasing-force-adjusting member is designed specifically for adjusting biasing force with appropriate positioning, while the regulating member is designed specifically for controlling lift amount with precise positioning. This local specialization of function ensures that adjusting one parameter does not adversely affect the other.
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
This configuration reduces variation in valve lift and enhances operational reliability by maintaining the initial biasing force, ensuring the valve opens at a predetermined pressure without damaging the biasing-force-adjusting member.
Implementation Method 1
a spring that biases the valve member to be in contact with a valve seat formed around the communication hole
Implementation Method 2
reduces pressure of the first space by opening the valve when the pressure of the fluid in the first space is equal to or more than the predetermined pressure and transferring the fluid in the first space to the second space
Data Source
AI summary
A relief valve, capable of reducing pressure of fuel in a discharge passage and including a valve housing having a communication hole and a valve member provided in a reciprocating manner against the valve housing, where the valve member regulates a flow of the fuel between a discharge passage and a fuel chamber when the valve member is brought into contact with an inner wall formed around the communication hole. T the valve member also allows the flow of the fuel between the discharge passage and the fuel chamber when the valve member is separated from the inner wall. The relief valve further including a spring that biases the valve member such that the valve member and the inner wall are in contact with each other an adjusting pipe and a stopper.