Door Check with Electromagnetic Blocking Mechanism
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Solution Overview
Problem
Existing vehicle door check systems lack reliable and secure automated fixing mechanisms, particularly in preventing unintended door opening due to external forces like wind, and often require complex external energy sources for operation.
Innovation Solution
A door check system featuring a retaining rod with an axially displaceable spindle rod and a spindle nut for conjoint rotation, combined with a contactless electromagnetic blocking mechanism using a permanent-magnetic armature disk, which converts axial movement into rotary movement and utilizes electromagnetic forces for secure door stopping without material wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical braking arrangement with material contact is used, then reliable door stopping is achieved, but material wear occurs reducing reliability over time
Solution Approach 1:
The patent replaces the traditional mechanical contact-based braking system with an electromagnetic braking mechanism. The electromagnetic brake uses magnetic fields to generate braking force without physical contact between moving parts, thereby eliminating material wear while maintaining reliable door stopping capability. This substitution of mechanical contact with electromagnetic interaction directly resolves the contradiction between reliability and material loss.
2Reliability
If an electromagnetic blocking mechanism is introduced, then contactless operation is achieved, but energy supply dependency increases
Solution Approach 1:
The electromagnetic brake is designed to operate periodically only when needed for door stopping or blocking, rather than continuously. The control system activates the electromagnetic brake selectively based on operational requirements, allowing the system to maintain high reliability through contactless operation while minimizing energy consumption by keeping the electromagnetic field inactive during normal door movement and only engaging it when braking or blocking is required.
3Measurement precision
If a high number of spindle rod rotations per unit length is used, then precise stopping is achieved, but device complexity increases
Solution Approach 1:
The patent introduces a control system as an intermediary between the spindle rod mechanism and the electromagnetic brake. This control system processes positioning information and coordinates the interaction between the mechanical spindle rod and electromagnetic brake components, enabling precise door stopping through coordinated control rather than relying solely on complex mechanical thread designs. The control intermediary simplifies the mechanical structure while maintaining or enhancing stopping precision through electronic 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
The system provides reliable and secure automated fixing of vehicle doors, preventing unintended opening and ensuring precise stopping through a high number of spindle rod rotations per unit length, with contactless operation that maintains performance over numerous cycles without energy supply dependency.
Implementation Method 1
a permanent-magnetic armature disk (56), wherein the electromagnet (62) has a central cylindrical cutout (63) through which the spindle rod (50) passes in a contactless manner
Implementation Method 2
an electromagnet (62), which is in this case held rigidly in its position relative to the retaining housing (13) by means of its mounting in the magnet housing (64)
Data Source
AI summary
The door check includes a retaining bar (20) which can be connected to one of the two door assembly parts, i.e. the door (8) or the door frame (6), and a retaining housing (13) which can be connected to the other door assembly part. In order to design a door check that allows a vehicle door to be reliably and safely blocked in an automated manner, a threaded bar (50) can be accommodated in an axially movable fashion in a cavity of the retaining bar (20).