Spline-Coupled Detent Hinge for Smooth Torque Transitions
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Solution Overview
Problem
Conventional detent hinges face challenges in achieving smooth and controlled movement between detent positions, often leading to noise, jarring movements, and increased complexity due to high part counts, which also complicates fitting and increases costs.
Innovation Solution
The design incorporates identical cam components with symmetrical or asymmetrical torque profiles, utilizing a spline interface and common parts to ensure smooth transitions, minimize wear, and reduce costs by using powdered metal for cam components, which provide consistent torque in both directions of rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cam surfaces are incorporated to achieve smooth movement between detent positions, then movement smoothness and noise reduction are improved, but device complexity and part count increase
Solution Approach 1:
The cam surfaces are integrated directly into the existing hinge components rather than adding separate cam mechanisms. The cam profiles are formed as part of the detent hinge structure itself, merging the cam function with the hinge body to reduce part count while maintaining smooth movement between detent positions.
Solution Approach 2:
The cam surfaces serve multiple functions: they provide smooth transition between detent positions, generate appropriate torque profiles, and eliminate noise. This multi-functionality reduces the need for additional specialized components, thereby reducing overall device complexity.
2Ease of operation
If cam surfaces are used to provide smooth transitions, then movement control is improved, but manufacturing cost increases
Solution Approach 1:
The cam profiles are designed with specific geometric parameters that can be manufactured using standard machining processes. By optimizing parameters such as cam radius, profile shape, and engagement geometry, the design achieves smooth movement control while remaining compatible with conventional manufacturing methods, thereby controlling manufacturing cost.
Solution Approach 2:
The cam surfaces are segmented into distinct zones with different profiles corresponding to different phases of rotation. This segmentation allows each zone to be optimized for its specific function (detent engagement, smooth transition, torque generation) while being manufactured as an integrated component, balancing manufacturing cost with performance.
3Force
If larger cam diameter is used to generate required torque, then torque output is improved, but ease of fitting decreases
Solution Approach 1:
The cam surfaces utilize curved profiles and optimized radii to generate the required torque. By carefully designing the curvature of the cam surfaces and optimizing the contact geometry, the system achieves adequate torque output without requiring excessively large cam diameters, thereby improving ease of fitting into existing applications.
Solution Approach 2:
The cam profiles employ asymmetric geometries where the radius and slope vary throughout the rotation cycle. This asymmetry allows the cam to generate high torque during critical engagement phases while maintaining smaller overall dimensions, as the torque is concentrated in specific angular ranges rather than requiring uniform large-diameter construction throughout.
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 solution achieves smooth and controlled movement, reduces wear, and lowers costs by using identical cam components, ensuring consistent torque and ease of assembly, while maintaining secure locking positions.
Implementation Method 1
The design incorporates identical cam components with symmetrical or asymmetrical torque profiles, utilizing a spline interface and common parts to ensure smooth transitions
Implementation Method 2
utilizing a spline interface and common parts to ensure smooth transitions, minimize wear
Implementation Method 3
minimize wear, and reduce costs by using powdered metal for cam components
Data Source
AI summary
One aspect is a detent hinge device having a first cam component with at least one spline and an axial cam face, the first cam component having a root diameter and an outer diameter. A second cam component has at least one spline and an axial cam face, the second cam component having a root diameter and an outer diameter. Each of the first and second cam components are aligned on an axis, wherein the cam faces of the first inner and first outer cam components face each other. An axial spring acts on the first cam component forcing it against the second cam component. An axial retention element securing each of the first and second cam components and axial spring on the axis. A first mounting bracket has splines on an inner surface. The first mounting bracket contains the first cam component such that the splines of the first mounting bracket engage the splines of the first cam component thereby transferring torque from the first cam component to the first mounting bracket via the splines. A second mounting bracket has splines on an inner surface. The second mounting bracket contains the second cam component such that the splines of the second mounting bracket engage the splines of the second cam component thereby transferring torque from the second cam component to the second mounting bracket via the splines. The first and second cam components comprise the same shape.