Solenoid Valve Adjustable Spring Force
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Solution Overview
Problem
Existing solenoid valves in brake systems face challenges with precision in opening pressures due to increased miniaturization and tolerance chains, leading to variability in spring preload force, which is complex and costly to adjust.
Innovation Solution
The solenoid valve features a three-dimensionally convex closure element that is selectively positioned in the axial passage, allowing for precise adjustment of spring force by matching the diameter of the closure element and passage, reducing assembly complexity and tilting issues, and enabling precise force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a bolt is used to adjust spring preload force in the axial passage, then the spring force can be adjusted, but the assembly becomes complex and time-consuming with risk of tilting
Solution Approach 1:
The closure element is designed as a three-dimensionally convex body (spherical or rounded shape) instead of a traditional bolt. This curved geometry enables the element to be inserted into the axial passage without tilting, as the spherical shape naturally self-centers during insertion. The curvature eliminates the need for complex alignment procedures while maintaining the ability to adjust spring preload force by positioning the convex body at different axial locations within the passage.
2Volume of moving object
If miniaturization is implemented to meet control system requirements, then the valve size is reduced, but the tolerance chain increases and precision in opening pressures decreases
Solution Approach 1:
The invention changes the geometric parameters of the closure element and axial passage to enable precise positioning. The three-dimensionally convex body is designed with specific diameter relationships to the axial passage diameter, creating a press-fit connection that provides both positioning and centering. This parameter optimization allows the miniaturized valve to maintain precise opening pressure control despite reduced overall dimensions and increased relative tolerance effects.
3Manufacturing precision
If traditional adjustment methods are used, then spring force can be corrected, but assembly time increases and production becomes less economic
Solution Approach 1:
The closure element is pre-positioned at the desired axial location during the valve assembly process. The three-dimensionally convex body is inserted into the axial passage in a single operation, simultaneously achieving both the press-fit connection and the spring preload adjustment. This preliminary positioning action eliminates the need for separate adjustment steps, reducing assembly time and increasing production efficiency while maintaining the ability to correct spring force variations.
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 solution allows for adjustable and precise spring force setting, reducing variability and assembly time, enabling more economic production with greater tolerances and improved valve function, while avoiding tilting and seizing during assembly.
Implementation Method 1
a compression spring is positioned in the axial passage, wherein the compression spring is held under preload between the plunger and the closure element
Implementation Method 2
The magnet actuator acts on an armature mounted so as to be axially movable in a housing, wherein a valve sealing body is arranged at one end of said armature
Implementation Method 3
A pole core of the magnet actuator is assigned to the other end of the armature and, on application of a voltage, exerts a magnetic field on the armature in order to displace this axially
Data Source
AI summary
A solenoid valve, in particular for controlling a brake pressure of a wheel brake of a motor vehicle, includes a pole core, an axially moveably mounted armature, a valve element, a closure element, a plunger, and a pressure spring. One end of the armature is associated with the pole core. The valve sealing element is arranged at another end of the armature. The armature has an axial through-opening. The closure element is force-lockingly and/or interlockingly retained in the axial through-opening in a selectable position. The plunger is axially moveably mounted in the axial through-opening, which provides a connection to the pole core in an installation position. The pressure spring is positioned in the axial through-opening and is retained in a pretensioned manner between the plunger and the closure element. The closure element is designed as a three-dimensionally convex element.