High-Pressure Fuel Pump Suction Valve Deformation Control
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Solution Overview
Problem
The existing suction valve in high-pressure fuel pumps is prone to deformation due to double press-fitting, leading to altered valve lift and reduced operation speed, and is susceptible to self-closure from fuel backflow, resulting in uneven fuel distribution and pressure control issues.
Innovation Solution
A suction valve design that eliminates double press-fitting by sliding and inserting the valve sleeve into the valve installation space, with a support part, guide part, and connection part to maintain a preset valve lift, and includes a guide groove to prevent valve plate movement during fuel backflow, ensuring accurate flow control and pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the valve sleeve is press-fitted into the valve body and then press-fitted into the housing (double press-fitting structure), then the valve sleeve can be securely assembled, but the valve sleeve deforms and the valve lift changes
Solution Approach 1:
The assembly process is segmented into two independent stages: first the valve body is press-fitted into the housing, then the valve sleeve is inserted into the valve body through the opening. This segmentation prevents cumulative deformation from double press-fitting while maintaining secure assembly at each stage.
Solution Approach 2:
Instead of press-fitting the valve sleeve into the valve body and then press-fitting the assembly into the housing, the invention inverts the sequence by first assembling the valve body into the housing, then inserting the valve sleeve through the opening. This reversal eliminates the double press-fitting deformation problem.
2Strength
If the valve lift is changed due to deformation, then the valve operation speed is reduced, but the double press-fitting structure provides secure assembly
Solution Approach 1:
The invention inverts the conventional assembly sequence to eliminate double press-fitting. By first installing the valve body into the housing and then inserting the valve sleeve through the opening, the valve lift is maintained at the preset interval, ensuring proper valve operation speed while achieving secure assembly.
3Reliability
If the suction valve is not operated during low load or fuel cut conditions, then fuel backflow occurs from the pump chamber side, but operating the valve consumes energy
Solution Approach 1:
The valve plate is designed to automatically open when fuel backflows from the pump chamber side due to its elastic support on the valve spring. This self-service mechanism prevents pressure control issues during low load or fuel cut conditions without requiring external energy input or ECU control signals.
Solution Approach 2:
The valve plate's elastic support and positioning structure provide preliminary protection against fuel backflow by automatically opening the valve when backflow pressure exceeds the spring force, preventing harmful effects before they can occur without needing active control.
4Reliability
If the valve plate is not guided during fuel backflow, then the suction valve may self-close, but adding guidance structures increases device complexity
Solution Approach 1:
The valve body opening serves a dual function: it allows the valve sleeve to be inserted during assembly and simultaneously guides the valve plate during operation to prevent self-closure from fuel backflow. This multi-functionality eliminates the need for separate guidance structures, maintaining simple device architecture while ensuring reliable flow control.
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 design prevents valve sleeve deformation, maintains consistent valve lift, and ensures accurate control of discharged flow and fuel rail pressure, reducing operational noise and improving fuel distribution efficiency.
Implementation Method 1
a valve spring (500) seated on the valve sleeve (400)
Implementation Method 2
a solenoid part (150) provided with a rod (151) for performing a linear reciprocal motion
Data Source
AI summary
A suction valve of a high-pressure fuel pump for a vehicle includes a housing having an inlet through which a fuel is introduced and a pump chamber configured to press the fuel, a valve installation space arranged between the inlet and the pump chamber, and a solenoid part provided with a rod for performing a linear reciprocal motion, and further includes a valve sleeve inserted into the valve installation space and formed with a flow hole, a valve spring seated on the valve sleeve, a valve plate elastically supported by the valve spring, and moving in conjunction with the rod, and a valve sheet formed with an introduction hole opened and closed by the valve plate, in which the valve sleeve is slid and inserted into the valve installation space, and the valve sheet is fitted into and fastened to the valve installation space to support the valve sleeve.