Vehicle Door Support Device with Magnetoresistive Mechanism
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Solution Overview
Problem
Existing vehicle door support devices face challenges in maintaining a stable and adjustable load due to temperature and environmental changes, particularly with gas springs used in similar systems, which affect the consistency of the door's opening and closing mechanism.
Innovation Solution
A vehicle door support device incorporating a first and second support member with a gear mechanism, a coil spring, and a magnetoresistive mechanism that allows for adjustable load application, ensuring stable operation by minimizing the impact of temperature and environmental changes through the magnetoresistive mechanism's adjustable magnetic resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a gas spring is used to bias the door, then the door can be held at an open position, but the load cannot be finely adjusted and is affected by temperature changes
Solution Approach 1:
The patent replaces the gas spring (pneumatic system) with a coil spring (mechanical system) combined with a magnetoresistive mechanism. The magnetoresistive mechanism uses magnetic fields to provide adjustable damping force, eliminating the temperature sensitivity of gas springs while enabling fine load adjustment through electrical control of the magnetizing force.
Solution Approach 2:
The patent changes the physical state and parameters of the spring system by using a coil spring with adjustable pre-load and a magnetoresistive mechanism with variable magnetic resistance. The magnetic resistance can be adjusted by changing the magnetizing force, allowing continuous adjustment of the damping characteristics without being constrained by gas pressure limitations.
2Reliability
If a magnetoresistive mechanism is added to adjust load, then load stability improves, but device complexity increases
Solution Approach 1:
The magnetoresistive mechanism serves multiple functions: it provides adjustable damping force to control door closing speed, maintains stable load under temperature variations, and enables fine adjustment of the biasing force. By integrating these functions into a single mechanism, the patent reduces overall system complexity despite adding new components.
Solution Approach 2:
The magnetoresistive mechanism acts as an intermediary between the coil spring and the door, providing controlled resistance to the door's movement. This intermediary component allows the simple coil spring to achieve complex damping characteristics that would otherwise require a much more complicated mechanical system.
3Stability of the object's composition
If the door is held at open position by spring force, then the door remains stable, but the door cannot be prevented from sudden closing
Solution Approach 1:
The magnetoresistive mechanism applies preliminary damping resistance to the door's closing motion before the door can suddenly slam shut. The magnetic field creates a retarding force that opposes the door's movement throughout the closing process, preventing sudden closing while maintaining stable positioning when the door is open.
Solution Approach 2:
The magnetoresistive mechanism provides continuous damping force during the door's entire closing trajectory, ensuring smooth and controlled motion. This continuous action prevents the intermittent or sudden release of energy that would cause slamming, while maintaining the door's stable position when held open.
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 device provides stable and adjustable load application to the door, preventing sudden opening and closing, while maintaining consistent performance across varying conditions.
Implementation Method 1
a magnetoresistive mechanism that is arranged in the accommodating portion, is connected to the second connecting portion, and applies a load to the spindle via the gear mechanism
Implementation Method 2
a coil spring that is arranged in the movable member and biases the movable member so as to advance with respect to the cover
Implementation Method 3
a gear mechanism that is arranged in the accommodating portion, has a first connecting portion located close to the cover and a second connecting portion located close to the end portion of the accommodating portion, and sets a rotational speed of the first connecting portion to be lower than a rotational speed of the second connecting portion
Data Source
AI summary
A vehicle door support device includes a support member and a support member that hold a door at an open position. Each of these support members includes: a cylindrical accommodating portion; a cylindrical cover connected to the accommodating portion; a cylindrical movable member movable relative to the cover in an axial direction; a gear mechanism arranged in the accommodating portion; a spindle connected to a first connecting portion of the gear mechanism; a rotation mechanism that rotates the spindle by movement of the movable member relative to the cover; and a coil spring that biases the movable member so as to advance with respect to the cover. At least the support member includes a magnetoresistive mechanism that is arranged in the accommodating portion, is connected to the second connecting portion of the gear mechanism, and applies a load to the spindle via the gear mechanism.