Propeller Pitch Hydraulic Device Clevis Nut Access
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Solution Overview
Problem
The existing hydraulic devices for changing the pitch of propeller blades face challenges during maintenance operations due to insufficient space for the nut and screw/nut connection, requiring dismantling of adjacent parts to access and manipulate the nut, which complicates the mounting and dismantling process.
Innovation Solution
A hydraulic device with a piston rod featuring a clevis and a self-locking threaded nut retained by elastic means, allowing for easy unscrewing and loosening from the control shaft without disassembling other parts, utilizing a metallic plate and interface metal part with elastic lugs for secure retention and anti-rotation functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a conventional screw/nut connection is used in the hydraulic device, then the connection is secure and reliable, but the nut cannot be accessed or manipulated during maintenance due to insufficient space in the constrained environment
Solution Approach 1:
The nut is extracted from the constrained environment by being mounted on a threaded rod that extends outward from the clevis. This allows the nut to be accessed and manipulated from outside the constrained space, enabling easy maintenance operations without dismantling adjacent parts.
Solution Approach 2:
The threaded rod acts as an intermediary element that connects the nut to the clevis. By introducing this intermediate component, the nut can be positioned in an accessible location while still maintaining its functional connection to the hydraulic device, solving the space access problem.
2Productivity
If the hydraulic device is designed with standard clevis and nut connection, then the structural integrity is maintained, but rapid mounting and dismantling cannot be achieved due to space constraints
Solution Approach 1:
The connection components (nut and threaded rod) are extracted from the internal constrained space of the clevis to an external accessible position. This extraction enables rapid manipulation of the nut for mounting and dismantling operations without interfering with the compact architecture of the hydraulic device.
Solution Approach 2:
The connection system is segmented into separate components: the clevis, the threaded rod, and the nut. This segmentation allows the nut to be independently positioned on the extending threaded rod, making it accessible for rapid operation while maintaining the structural integrity of the overall assembly.
Data Source
AI summary
A hydraulic device for changing the pitch of a propeller including a piston rod actuated by a hydraulic fluid, the piston rod including at its end a clevis mount able to provide a connection for transmitting the movements of the piston rod so as to change the pitch of at least one propeller, a thread nut held in position on the clevis of the piston rod by a fastener, the nut being able to collaborate with a threaded rod in order to provide a connection.