Vehicle Door Hinge Cam Detent Positioning
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Solution Overview
Problem
Existing door hinges for vehicles do not effectively maintain the door in multiple open positions until manually closed, lacking a mechanism to securely hold the door at desired angles and efficiently return it to a closed position.
Innovation Solution
A hinge assembly with a cam member and biasing member, where the cam member has a protrusion that engages with detents in a slot, allowing the door to be held at various open positions and automatically returned to a closed position using a torsion spring for assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a door hinge allows the door to be opened and closed, then the door can be separated from the vehicle body, but the door cannot be maintained in multiple open positions without additional mechanisms
Solution Approach 1:
The hinge mechanism transitions from a static connection to a dynamic system with movable components. The cam member moves along the slot in the casing, and the protrusion engages with detents at specific positions, allowing the door to be held at multiple open angles (first open position, second open position) while returning to closed position under spring force.
Solution Approach 2:
The hinge mechanism is divided into distinct functional components: the cam member with protrusion for positioning, the slot with multiple detents for engagement points, and the biasing member for automatic closure. This segmentation allows each component to perform its specific function while working together to achieve multi-position door holding capability.
2Adaptability or versatility
If a mechanism is added to maintain the door in multiple open positions, then the door can be held at desired angles, but the device complexity increases
Solution Approach 1:
The positioning function and the closure function are merged into a single integrated hinge mechanism. The cam member simultaneously provides multi-position holding through detent engagement and enables automatic closure through interaction with the biasing member, eliminating the need for separate positioning and closure mechanisms.
Solution Approach 2:
The hinge mechanism performs multiple functions: it allows the door to be opened and closed, maintains the door at multiple open positions (first open position, second open position), and automatically returns the door to closed position. The cam member and slot assembly serves both positioning and actuation functions.
3Productivity
If a biasing member is added to automatically return the door to closed position, then the door closure efficiency is improved, but the device complexity increases
Solution Approach 1:
The hinge mechanism is designed to automatically return the door to closed position without requiring external intervention. The biasing member (torsion spring) stores energy when the door is opened and automatically releases this energy to propel the door back to closed position, making the system self-serving for the closure function.
Solution Approach 2:
The biasing member is pre-loaded with potential energy when the door is in closed position. As the door is opened and the cam member moves along the slot, the spring is further compressed or twisted, storing additional energy that will be released to automatically return the door to closed position, preparing the system in advance for the closure action.
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
Enables the door to be securely maintained at multiple open positions and efficiently returned to a closed position, enhancing both functionality and aesthetics by providing a mechanism for controlled door positioning and automatic closure.
Implementation Method 1
the biasing member is a torsion spring
Data Source
AI summary
A hinge assembly includes a hinge member joined to a vehicle door. A cam member is disposed about a portion of the hinge member, and the cam member has a protrusion. A casing is joined to a body portion of the vehicle, and the casing has an aperture along an axis. The aperture is configured to receive a portion of the cam member therein, and the casing has a slot including a first detent configured so the protrusion of the cam member moves along the slot. A biasing member urges the cam member in a direction to move the door to a closed position. When the door is rotated to an open position, the protrusion moves along the slot to an engaged position with the first detent such that the door is maintained in the open position until the door is moved to disengage the protrusion from the first detent.