Solenoid Valve Step Section for Stable Brake Throughflow
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Solution Overview
Problem
Existing solenoid valves for slip-controlled motor vehicle brake systems tend to vibrate due to hydraulic pressure medium flow, leading to discontinuous throughflow under unfavorable conditions.
Innovation Solution
A solenoid valve design featuring a valve plunger with a step section that protrudes into an inlet chamber, generating an axial force opposing the valve closing direction, thereby stabilizing the valve plunger and preventing unwanted vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve plunger is guided with small radial play to improve flow continuity, then throughflow stability improves, but valve plunger vibrations occur under unfavorable conditions
Solution Approach 1:
The patent introduces a counterbalancing force by positioning the step section to be impinged upon by the pressure medium. This generates an axial force opposing the closing direction of the valve plunger, creating a stabilizing counterbalance to the vibrational forces and hydraulic pressure fluctuations, thereby preventing valve plunger vibrations while maintaining stable throughflow.
2Reliability
If the restoring spring is arranged to open the valve seat, then valve opening reliability improves, but the valve plunger becomes susceptible to vibrations from pressure medium flow
Solution Approach 1:
The step section is pre-positioned on the valve plunger to intercept the pressure medium flow before it can cause harmful vibrations. The pressure medium impinges on the step section, generating a stabilizing axial force in advance that counteracts the harmful vibrational effects, thus preventing rather than merely responding to the vibrations.
3Stability of the object's composition
If the step section is positioned at an axial distance from the valve closing element, then vibration prevention improves, but valve response time may be affected
Solution Approach 1:
The step section is positioned at a specific axial location on the valve plunger, optimized to intercept pressure medium flow at the most effective point for generating stabilizing force. This localized positioning ensures maximum vibration prevention effect while minimizing impact on the overall valve response characteristics, as the step section does not interfere with the electromagnetic actuation of the magnet armature.
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 design ensures a stable and continuous throughflow by preventing valve plunger vibrations, while also allowing for improved flow rates and analog control of the valve.
Implementation Method 1
a face surface which is impinged on by a pressure medium flowing into the inlet channel in order to generate an axial force that acts oppositely to the closing direction of the valve plunger
Implementation Method 2
a magnet armature, which is provided for the electromagnetic actuation of the valve plunger
Data Source
AI summary
A solenoid valve has a valve plunger which is guided in a passage bore of a valve housing. The valve plunger with its valve closing element is held in a basic position by a restoring spring. The basic position opens up a valve passage in a valve seat. The valve plunger is arranged between an inlet and an outlet channel in the valve housing. A magnet armature provides actuation of the valve plunger. An inlet chamber is connected to the inlet channel between the passage bore and the valve seat. The valve plunger protrudes into the inlet chamber by way of a step section. As a result of being hydraulically impinged on by the pressure medium of the inlet channel an axial force is generated on the valve plunger that acts oppositely to the closing direction of the valve plunger.