Electromagnetic Tailgate Hinge with Magnetorheological Fluid
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Solution Overview
Problem
Existing vehicle tailgate assemblies face challenges in smoothly transitioning between closed and open positions, often requiring manual effort and lacking efficient mechanisms to control motion and prevent wobbling.
Innovation Solution
The integration of an electromagnetic cylinder with a vane hub and magnetorheological fluid, coupled with a sensor to detect motion and control the magnetic field, allows for dynamic control of the tailgate's pivot motion, reducing the transition speed and preventing wobbling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional hinge assemblies are used for tailgate, then the structure is simple and cost-effective, but the transition between closed and open positions is abrupt and requires manual effort
Solution Approach 1:
The hinge assembly incorporates an electromagnetic cylinder that dynamically adjusts the tailgate's motion characteristics during the transition between closed and open positions. The electromagnetic actuator provides controlled force to ease the transition, transforming the static mechanical hinge into a dynamic system that can adapt its behavior during operation.
Solution Approach 2:
The patent replaces traditional mechanical spring or cable mechanisms with an electromagnetic cylinder to control tailgate motion. This substitution eliminates the need for complex mechanical linkages while providing smoother, more controllable transition through electromagnetic force application.
2Productivity
If the tailgate transitions quickly between positions, then productivity is improved, but wobbling and instability occur during motion
Solution Approach 1:
The hinge assembly incorporates a sensor that detects the tailgate's position and motion during transition. This feedback information is used to control the electromagnetic cylinder's force application, allowing the system to adjust its response in real-time to prevent wobbling while maintaining efficient transition speed.
Solution Approach 2:
The electromagnetic cylinder dynamically changes the force parameters during tailgate transition based on real-time conditions. By adjusting the electromagnetic force magnitude and timing, the system can control the transition speed to maintain stability while achieving productive operation speed.
3Ease of operation
If torsion bars are used to control tailgate motion, then motion control is achieved, but weight and cost increase
Solution Approach 1:
The patent replaces heavy torsion bars with a lightweight electromagnetic cylinder to achieve motion control. The electromagnetic actuator provides the necessary force control without the weight penalty of traditional mechanical spring systems, reducing overall assembly weight while maintaining motion control capability.
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 enables smooth and controlled movement between closed and open positions, eliminates the need for torsion bars, and provides weight and cost savings by dynamically managing the tailgate's motion and stability.
Implementation Method 1
A magnetorheological fluid is positioned around the vane. A sensor is positioned proximate the cylinder and configured to detect motion of the vanes relative to the cylinder
Implementation Method 2
A hinge pivot is coupled to the tailgate and includes an electromagnetic cylinder and a vane hub positioned within the cylinder
Data Source
AI summary
A vehicle tailgate assembly includes a tailgate adapted to pivotally latch to a vehicle cargo box. A hinge pivot is coupled to the tailgate and includes an electromagnetic cylinder and a vane hub positioned within the cylinder and coupled to at least one of the tailgate and the cargo box. The vane hub is configured to rotate within the cylinder. A vane is coupled to the vane hub. A magnetorheological fluid is positioned around the vane.