Hydraulic Piston Rod Assembly Tool-Less Disassembly
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Solution Overview
Problem
Current hydraulic fluid pumps face challenges in efficiently disassembling the piston rod assembly for maintenance and component replacement, as the assembly is tightly integrated and requires complex procedures involving rotational and axial movements of the sleeve and extension rod, making it difficult to access and remove components like the piston and liner without tools.
Innovation Solution
The piston rod assembly is designed with a three-part extension rod and a sleeve that can be rotated and axially translated to uncouple and re-couple the rod sections, allowing for tool-less disassembly by breaking and re-engaging zero-pitch threads and using pins to prevent rotation, enabling the removal of the piston and liner without disassembling the drive end from the fluid end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston rod assembly is tightly integrated for operational stability, then reliability is improved, but ease of repair deteriorates
Solution Approach 1:
The extension rod is divided into multiple sections (first extension rod section, second extension rod section) that can be independently removed. The sleeve is segmented with internal threads that engage with corresponding threads on the extension rod sections, allowing each section to be separately detached through rotational movement of the sleeve, thus enabling easy repair while maintaining operational stability during use.
Solution Approach 2:
The connection between the sleeve and extension rod sections uses dynamic threaded engagement that transitions from a locked state during operation to an easily detachable state during maintenance. The zero-pitch threads allow the sleeve to be rotated and axially moved to disengage from the extension rod sections, providing dynamic adaptability between operational integrity and maintenance accessibility.
2Reliability
If the piston rod assembly uses complex rotational and axial movements for disassembly, then reliability is improved, but device complexity deteriorates
Solution Approach 1:
The sleeve performs multiple functions: it connects the first and second extension rod sections during operation, provides a rotational interface for disassembly, and enables axial movement to engage or disengage the threaded connections. This multi-functionality reduces the need for separate components or procedures, simplifying the overall device while maintaining connection integrity.
Solution Approach 2:
The disassembly mechanism is self-contained within the existing structure of the piston rod assembly. The sleeve's internal threads and the extension rod sections' external threads form a self-service connection system that requires no external tools or additional mechanisms. The rotational and axial movements of the sleeve automatically disengage the threaded connections, making the complex disassembly procedure inherent to the design rather than an added complexity.
3Strength
If the extension rod is made as a single integrated piece for strength, then strength is improved, but ease of repair deteriorates
Solution Approach 1:
The extension rod is segmented into a first extension rod section and a second extension rod section, connected through the sleeve. During operation, the sleeve engages both sections to provide strength comparable to an integrated rod. During repair, the sleeve can be rotated and axially moved to disengage from one or both sections, allowing replacement of worn sections without replacing the entire rod, thus maintaining strength while improving ease of repair.
Solution Approach 2:
The segmented design allows individual extension rod sections to be discarded and replaced independently when worn or damaged, while the sleeve and other components are recovered and reused. This selective replacement strategy maintains the overall strength of the assembly while significantly reducing repair complexity and cost compared to replacing an entirely integrated rod.
Data Source
AI summary
A piston rod assembly of a hydraulic fluid pump includes an extension rod extending axially between a first axial end and a second axial end. The extension rod is defined by a first portion, a second portion, and a third portion. The first portion extends from the first axial end to the third portion and the second portion extends from the second axial end to the third portion. The piston rod assembly further includes a sleeve extending around the third portion. The sleeve is configured to couple the first portion to the second portion.