Hydraulic Cylinder Gland Puller for Disconnected Piston Removal
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Solution Overview
Problem
Existing methods fail to effectively remove a gland assembly from a hydraulic cylinder when the piston nut loosens and disconnects, preventing the use of conventional removal procedures due to the lack of piston contact with the gland assembly.
Innovation Solution
A gland puller comprising an elongated rod with a threaded collar and a rotating protrusion member, which allows for the rod to be pulled back and the collar to apply force to the gland assembly, enabling its removal even when the piston is disconnected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional removal procedures are used (pushing gland into barrel and pulling rod), then the gland assembly can be removed when piston is intact, but the procedure fails when piston nut loosens and piston disconnects from rod
Solution Approach 1:
The patent introduces a gland puller tool as an intermediary device between the rod and the gland assembly. This tool includes a collar that engages with the gland assembly and a rod that transmits pulling force. The intermediary tool enables force transmission even when the piston is disconnected, solving the reliability problem of conventional procedures.
Solution Approach 2:
The gland puller tool is segmented into distinct functional components: a collar portion that engages the gland assembly, a rod portion that transmits force, and a handle portion for operator control. This segmentation allows each component to perform its specific function independently, enabling the tool to work effectively regardless of piston connection status.
2Ease of operation
If the piston abuts the gland assembly during pulling, then the gland can be pulled past the groove, but this mechanism fails when piston is disconnected
Solution Approach 1:
The gland puller tool serves as an intermediary that replaces the piston's function of abutting and pulling the gland assembly. The tool's collar engages the gland assembly directly, and the rod transmits pulling force, eliminating the need for piston-gland contact. This makes the removal process adaptable to conditions where the piston is disconnected.
Solution Approach 2:
The gland puller tool is designed to perform multiple functions: it can push the gland assembly into the barrel, hold it in position, and pull it out. The tool's design with adjustable collar positioning and engaging snap rings makes it universally applicable whether the piston is connected or disconnected, providing versatility in handling different failure conditions.
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 the removal of the gland assembly without damaging the gland or its components, facilitating the rebuilding of hydraulic cylinders by providing a tool that can handle stuck gland assemblies.
Implementation Method 1
a threaded collar, and a rotating protrusion member. The elongated rod may include a first end including a slot, a second end, and a threaded portion along a mid-surface of the elongated rod
Data Source
AI summary
Gland puller for use in rebuilding hydraulic cylinders. Upon insertion of the first end of the elongated rod into a shaft hole of the hydraulic cylinder gland assembly beyond a first point, the rotating protrusion member is configured to rotate from the first position to the second position, and upon rotating the threaded collar along the threaded portion towards the first end, the elongated rod is configured to be pulled back from the first point to a second point where a surface of the at least one end of the rotating protrusion member is configured to abut an inner surface of the hydraulic cylinder gland assembly while a surface of the threaded collar is configured to abut an outer surface of the hydraulic cylinder gland.