Internal Relief Valve Layout for Stable Floor Jack Load Limits
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Solution Overview
Problem
Floor jacks with internally-relieved hydraulic systems face operator confusion due to the proximity of relief valve adjustment ports to other components, leading to potential overloading or underloading, which can result in equipment failure, property damage, and personal injury.
Innovation Solution
The relief valve is made internally adjustable and inaccessible to operators without disassembling the power unit, ensuring it cannot be inadvertently adjusted during maintenance, while allowing for proper calibration during assembly, refurbishment, and repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the relief valve adjustment port is exposed to the outside via a port for easy adjustment, then the ease of operation is improved, but the reliability deteriorates due to potential accidental adjustments by operators
Solution Approach 1:
The adjustment mechanism is extracted from the external accessible area and relocated inside the valve block. The port is moved to an internal location within the valve assembly, making it inaccessible to operators during normal operation and maintenance, thereby preventing accidental adjustments while preserving the ability to adjust during controlled assembly or repair procedures.
2Reliability
If the relief valve is made inaccessible internally, then the reliability is improved by preventing accidental adjustments, but the ease of repair deteriorates as technicians must disassemble the power unit to access the valve
Solution Approach 1:
The valve assembly is segmented into adjustable components that can be accessed through controlled disassembly. The port is positioned within the valve block structure such that while full access requires power unit disassembly, the adjustment mechanism itself is a separate, replaceable component that can be serviced independently once accessed.
3Device complexity
If the port is located in close proximity to other components for compact design, then the device complexity is reduced, but the reliability worsens due to operator confusion and mistaken adjustments
Solution Approach 1:
The adjustment port function is extracted from the external surface and relocated to an internal position within the valve block. This removes the port from the confusing proximity of other external components while maintaining compact internal layout, eliminating operator confusion without increasing overall device complexity.
Data Source
AI summary
A hydraulic power unit for a floor jack that includes an internally-adjustable relief valve that is inaccessible to an operator without removing the power unit from the jack assembly and disassembling the power unit. By placing the relief valve inside of the hydraulic assembly, hidden from operators, the relief valve is less likely to be accidently adjusted when using or servicing the jack.