Hinge Assembly with Adjustable Torque via Shape Memory Alloy
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Solution Overview
Problem
Hinge torque in dual-body computing devices can vary due to wear and loss of lubrication, leading to inconsistent performance over time, requiring stronger mounting techniques to maintain adequate torque.
Innovation Solution
A hinge assembly utilizing shape memory alloy (SMA) wires coupled to spring clutches to adjust the position of an adjustment nut, which clamps friction surfaces to control torque, allowing for gradual tightening or loosening of the hinge assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher than required torque is applied to the hinge initially, then the torque remains sufficient over time despite wear and lubrication loss, but stronger mounting techniques are required
Solution Approach 1:
The hinge assembly incorporates an adjustment mechanism that allows the torque to be dynamically adjusted over time. The adjustment nut and friction disks create a variable torque system where the clamping force can be increased as wear occurs, transforming the static torque system into a dynamic one that adapts to changing conditions without requiring stronger initial mounting.
Solution Approach 2:
The invention changes the torque parameter over time through the adjustment mechanism. By modifying the clamping force on the friction disks via the adjustment nut, the torque can be increased as wear and lubrication loss occur, allowing the hinge to maintain sufficient torque without requiring excessively strong initial mounting techniques.
2Reliability
If adjustable torque mechanism is added to the hinge, then torque can be maintained over time, but device complexity increases
Solution Approach 1:
The hinge assembly includes a sensor that automatically detects torque levels and triggers the adjustment mechanism when torque falls below a threshold. This self-service capability allows the system to automatically compensate for wear and maintain torque without requiring external intervention or complex control systems, balancing reliability improvement with acceptable complexity.
Solution Approach 2:
The invention incorporates a sensor that provides feedback on the actual torque level to the control system. This feedback loop enables the system to monitor torque continuously and activate the adjustment mechanism only when needed, creating a responsive but not overly complex control system that maintains torque consistency efficiently.
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 SMA wire system enables precise control of hinge torque, maintaining optimal performance over the device's lifetime without the need for excessive initial torque and stronger mounting, thus enhancing the durability and efficiency of dual-body computing systems.
Implementation Method 1
a first shape memory alloy (SMA) wire coupled to the first spring clutch, wherein, upon energization, a length of the first SMA wire is adjusted to change the positioning of the adjustment nut
Implementation Method 2
a first spring clutch coupled to the adjustment nut, the first spring clutch configured to control a positioning of the adjustment nut relative to the friction disks
Implementation Method 3
a plurality of friction disks positioned on the hinge shaft, the friction disks configured to exert a torque on the hinge shaft resulting from a clamping force
Data Source
AI summary
A hinge assembly for a computing system, including a first hinge bracket including a hinge shaft, the first hinge bracket coupled to a first body of the computing system; a second hinge bracket coupled to the hinge shaft, the second hinge bracket coupled to a second body of the computing system; friction disks positioned on the hinge shaft, the friction disks configured to exert a torque on the hinge shaft; an adjustment nut coupled to the hinge shaft, the adjustment nut configured to exert a force on the friction disks; a first spring clutch coupled to the adjustment nut, the first spring clutch configured to control a positioning of the adjustment nut relative to the friction disks; a first shape memory alloy (SMA) wire coupled to the spring clutch, wherein, upon energization, a length of the first SMA wire is adjusted to change the positioning of the adjustment nut.