Electromagnetic Valve Guide Pin Seizure Prevention
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Solution Overview
Problem
Existing electromagnetic valves for safety-related pneumatic systems in motor vehicles, such as ABS or EBS systems, face issues with high weight and production costs due to massive armatures and complex damping mechanisms, which can lead to armature seizure during overheating, compromising their functional efficiency.
Innovation Solution
The design incorporates an armature with an integral guide pin formed within the coil carrier, guiding the armature axially and reducing the risk of seizure by increasing radial clearance, and utilizes a sealing element with a dual function to simplify the design and reduce wear, allowing for a lighter and more cost-effective construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the armature is made massive to ensure structural strength, then the reliability is improved, but the weight increases and production costs increase
Solution Approach 1:
The armature is designed with non-uniform cross-section, being thicker at critical stress points and thinner elsewhere. This local quality variation ensures structural strength where needed while reducing overall weight and material consumption.
Solution Approach 2:
The armature combines different materials with complementary properties: a ferromagnetic core material for magnetic flux conduction and an aluminum alloy for the housing to reduce weight. This composite approach optimizes both strength and weight characteristics.
2Reliability
If the armature is made massive to ensure structural strength, then the reliability is improved, but the production costs increase
Solution Approach 1:
The armature is divided into functionally distinct segments: the ferromagnetic core for magnetic flux conduction and the aluminum housing for structural support. This segmentation allows each part to be manufactured using optimal processes and materials, reducing overall production cost while maintaining reliability.
Solution Approach 2:
By using composite materials (ferromagnetic core + aluminum housing), the design achieves required structural strength with less material than a purely massive design would require, thereby reducing material costs and production expenses.
3Use of energy by moving object
If the coil carrier inner diameter is reduced due to overheating, then the winding tension is maintained, but the risk of armature seizure increases
Solution Approach 1:
A guide pin acts as an intermediary element between the coil carrier and armature. It provides a fixed reference axis for armature movement, ensuring that even when the coil carrier deforms due to overheating, the armature maintains proper alignment and clearance, preventing seizure.
Solution Approach 2:
The design anticipates thermal expansion of the coil carrier material during overheating. By pre-positioning the guide pin and designing the guide channel with appropriate clearance, the system accommodates thermal deformation without causing armature seizure, maintaining both winding tension and reliability.
4Length of moving object
If the guide clearance is reduced to minimize axial build length, then the compactness is improved, but the risk of armature seizure increases
Solution Approach 1:
The guide pin serves as a mediator that decouples the relationship between axial build length and seizure risk. It provides precise positional reference that allows minimal guide clearance without causing seizure, enabling compact design while maintaining reliability.
Solution Approach 2:
The invention changes the critical parameter from guide clearance to guide pin positioning accuracy. By controlling the position and alignment of the guide pin rather than relying solely on clearance dimensions, the system achieves compact axial build length without increasing seizure risk.
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 minimizes the risk of armature seizure, enhances the service life of the electromagnetic valve, and optimizes its deployment in safety-related applications by reducing weight and production costs while maintaining vibration resistance and energy efficiency.
Implementation Method 1
an armature (9), which, by means of current supplied to an electrical winding (6), can be displaced axially relative to a core (13) and relative to a first valve seat (2), inside an inner channel (17) of a coil carrier (1) carrying the winding (6)
Data Source
AI summary
An electromagnetic valve for safety-related pneumatic systems in motor vehicles, with an armature (9), which, by means of current supplied to an electrical winding (6), can be displaced axially relative to a core (13) and relative to a first valve seat (2), inside an inner channel of a coil carrier carrying the winding (6) on a winding section, wherein, in the armature (9) is arranged a guide channel, into which projects axially a guide pin (3) formed integrally with the coil carrier (1), so as to guide the armature (9) in the course of its axial displacement.