Preassembled Friction Hinge Module for Lightweight Torque Control
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Solution Overview
Problem
Conventional friction hinges for applications like automobile center consoles are large, heavy, and require complex manufacturing, which adds weight and complexity to the console.
Innovation Solution
A preassembled friction hinge module comprising a shaft, torque element, and housing, allowing for lighter materials like molded plastic, reduced components, and simplified assembly, with a design that includes a cover, side wall, and rear wall defining interior spaces for the torque element, and apertures for the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional friction hinges are manufactured as large assemblies with stamped parts, then mechanical stability and torque control are achieved, but weight and device complexity increase significantly
Solution Approach 1:
The hinge assembly is divided into separate functional modules: a housing containing friction elements, a shaft for pivotal movement, and mounting brackets. This segmentation allows each component to be optimized independently and assembled into a compact configuration, reducing overall weight while maintaining mechanical stability through precise alignment and connection of the segmented parts.
Solution Approach 2:
The friction elements and torque control mechanisms are nested within the housing structure, with the shaft passing through the housing and connecting to mounting brackets. This nesting arrangement eliminates the need for separate external torque control components, reducing the overall assembly size and weight while maintaining the constant torque function.
2Strength
If conventional friction hinges use large stamped brackets and multiple components, then structural strength and torque control are maintained, but manufacturing complexity and tooling requirements increase
Solution Approach 1:
Multiple functions are merged into single components: the housing simultaneously provides structural support, contains friction elements, and integrates mounting features. The shaft combines the pivot axis function with connection points for mounting brackets. This merging reduces the total number of parts and eliminates the need for complex stamping tooling while maintaining structural strength through integrated design.
Solution Approach 2:
The housing is designed as a multi-functional component that provides structural support, houses friction elements for torque control, and includes integrated mounting features. This universal design allows a single component to perform multiple functions that would traditionally require separate parts, simplifying manufacturing while maintaining structural integrity.
3Ease of operation
If conventional friction hinges are designed as large assemblies, then mechanical interference and tactile feedback are ensured, but the overall size and weight of the console increase
Solution Approach 1:
The friction elements are concentrated in specific localized areas within the housing, creating high-density friction zones that provide strong tactile feedback in a compact space. The shaft diameter and friction element positioning are optimized to maximize tactile feedback while minimizing the overall volume occupied by the hinge assembly.
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 new design reduces weight and complexity while maintaining mechanical stability and tactile feedback, enabling efficient and lightweight friction hinge operation.
Implementation Method 1
a torque element frictionally engaging the shaft; This mechanical interference holds components in a stable position after they are pivoted and released, which is desirable for holding components such as doors and arm rests in any position. The mechanical interference also adds a tactile 'quality feel' to the door and arm rest movement, providing substantially constant resistance to rotation engaging the user experience during the closing and opening efforts.
Data Source
AI summary
A hinged system includes a preassembled hinge module for pivotally coupling a first component to a second component. The preassembled hinge module includes a shaft, a torque element frictionally engaging the shaft, and a housing. The housing includes a cover, a side wall, and a rear wall that define an interior space enclosed within the housing. The interior space receives the torque element inside the housing. The cover defines a first aperture, and the rear wall defines a second aperture, the first aperture and the second aperture aligned with a pivot axis of the shaft. The shaft extends through at least the first aperture, the interior space, and the second aperture. The shaft is separate from, and configured to be mounted to, the first component. The housing is separate from, and configured to be mounted to, the second component.