Brake Crawler Inch-Worm Movement for Elevator Hard Disk Drives
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Solution Overview
Problem
Elevator-type hard disk drives face challenges in precisely moving arm assemblies or components along a slider shaft for accurate access to vertically stacked readable media, requiring a mechanism that can both lock and move components with fewer parts and simplify the design.
Innovation Solution
A brake crawler assembly with first and second sets of clamp arms, each equipped with piezoelectric actuator elements, allows for precise vertical movement and locking along a slider shaft by exerting clamp forces and adjusting the distance between clamp arm sets to perform inch-worm movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanisms are used to move arm assemblies along a slider shaft, then the drive can access vertically stacked readable media, but the design becomes complex and reliability decreases
Solution Approach 1:
The brake crawler is divided into two independent sets of clamp arms (first set and second set), each capable of independently clamping and releasing the slider shaft. This segmentation allows the system to achieve reliable positioning through coordinated operation of simpler, modular components rather than a single complex mechanism.
Solution Approach 2:
The piezoelectric actuator elements automatically convert electrical signals into mechanical clamping forces without requiring additional mechanical linkages or intermediate components. Each clamp arm assembly is self-contained with its own actuator, eliminating the need for complex external actuation mechanisms and reducing overall system complexity while maintaining reliability.
2Manufacturing precision
If multiple components are used to ensure precise movement, then positioning accuracy improves, but the number of parts increases and design simplification is lost
Solution Approach 1:
The first and second sets of clamp arms are integrated into a single brake crawler assembly that operates as one coordinated unit. The piezoelectric actuator elements are embedded within the clamp arm structures themselves, merging the actuation function with the clamping function. This consolidation achieves precise positioning through the coordinated action of integrated components rather than through assembly of multiple separate precision parts.
Solution Approach 2:
Each clamp arm assembly serves multiple functions: it provides both the mechanical clamping force to hold the slider shaft and houses the piezoelectric actuator that controls the clamping action. The brake crawler assembly as a whole performs both positioning and locking functions. This multi-functionality reduces the number of dedicated components needed while maintaining manufacturing precision.
3Device complexity
If a simple locking mechanism is used, then the design becomes simpler, but the ability to perform inch-worm movements is compromised
Solution Approach 1:
The brake crawler employs dynamic control of the piezoelectric actuator elements, which can rapidly switch between clamped and released states in response to control signals. This dynamic operation allows the clamp arms to perform inch-worm movements by alternately engaging and disengaging from the slider shaft, providing both simplicity and operational flexibility. The system transitions smoothly between locked and moving states without requiring complex mechanical switches or additional actuators.
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 precise and accurate access to vertically stacked readable media by allowing the arm assembly to move and lock in place along the shaft, reducing the complexity of the design and increasing the reliability of data access operations.
Implementation Method 1
Each of the first and second sets of clamp arms include a base portion including a recess within which is disposed at least one actuator element (e.g., first piezoelectric element for the first set of clamp arms and second piezoelectric element for the second set of clamp arms)
Data Source
AI summary
A brake crawler for an elevator-type hard disk drive generally includes a first and second set of clamp arms vertically arranged, each of the first and second sets of clamp arms being capable of exerting a clamping force on a shaft or slider via activation or deactivation of an actuator element associated with each set of clamp arms. The brake crawler further includes an actuator element disposed between the first and second set of clamp arms which allows for movement of the first set of clamp arms away from the second set of clamp arms upon a change in state of the actuator element. Via a specific sequence of activating and deactivating various of the actuator elements associated with the brake crawler, the brake crawler is capable of inch worm-type movement up and down the shaft.