Vehicle Tailgate Hinge Assembly Anti-Rattle Mechanism
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Solution Overview
Problem
The larger clearance in truck tailgate hinges leads to audible rattling when driving over rough surfaces due to manufacturing tolerances and off-axis manipulation requirements, which existing designs fail to adequately address.
Innovation Solution
A hinge assembly with a first bracket and a second bracket connected by a pivot shaft, where the first bracket includes a cup with an engagement member and the second bracket features a resilient member, such as a leaf spring, that applies a force to the cup when the tailgate is closed and disengages when opened, preventing rattling through an anti-rattling mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If larger clearance is provided in the pivot to allow for off-axis manipulation and manufacturing tolerance, then ease of operation and manufacturing precision are improved, but audible rattling occurs when driving over rough surfaces
Solution Approach 1:
A resilient member (anti-rattle element) is introduced as an intermediary between the pivot shaft and the cup. This resilient member fills the clearance gap while maintaining the required manufacturing tolerances and off-axis manipulation capability, yet prevents the pivot shaft from rattling against the cup during vehicle operation
Solution Approach 2:
The resilient member is pre-installed in the cup to provide cushioning before any rattling can occur. This beforehand cushioning absorbs the impacts and vibrations that would otherwise cause audible rattling, while still allowing the pivot shaft to move within the necessary clearance for manufacturing tolerance and off-axis manipulation
2Manufacturing precision
If larger clearance is provided in the pivot to allow for manufacturing tolerance, then manufacturing precision is improved, but audible rattling occurs when driving over rough surfaces
Solution Approach 1:
The resilient member acts as an intermediary that accommodates the manufacturing tolerance clearance without allowing the pivot shaft to directly contact the cup. This maintains the necessary manufacturing precision while eliminating the harmful rattling effect
Solution Approach 2:
The resilient member is installed beforehand in the cup to cushion the pivot shaft's movement within the tolerance clearance. This pre-cushioning prevents rattling while maintaining the required manufacturing precision
3Stability of the object's composition
If resilient member applies continuous force to engagement member, then stability of connection is improved, but complexity of mechanism increases
Solution Approach 1:
The resilient member's force application is changed from continuous to conditional - it only applies force when the pivot shaft moves within the clearance gap during normal operation. When the tailgate is properly positioned, the resilient member is relaxed and applies no force, thus maintaining connection stability during operation while avoiding unnecessary complexity
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 anti-rattling mechanism effectively reduces or eliminates noise generated during driving by maintaining contact between the engagement member and resilient member at the closed position and disengaging at the open position, allowing for smooth operation and easy tailgate removal.
Implementation Method 1
a second bracket attached to a second part and including a resilient member... the resilient member moves away from the engagement member when the tailgate is at an opened position
Data Source
AI summary
A hinge assembly can removably mount a tailgate to a vehicle. The hinge assembly includes a first bracket attached to a first part. The hinge assembly further includes an engagement member and a second bracket attached to a second part and including a resilient member. A pivot shaft pivotally connects the first and second brackets. The engagement member engages the resilient member when the first part is at a first position and disengages the resilient member when the first part is at a second position.