Hydraulic Cylinder Load Distribution Nut for End Cap Fatigue Relief
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Solution Overview
Problem
Traditional hydraulic cylinders experience fatigue due to the direct transfer of axial loads through the end cap threads, leading to reduced functional lifespan, and there is a need for an improved end cap design that mitigates this issue without adding weight.
Innovation Solution
A hydraulic cylinder design featuring a load distribution nut between the end cap and pepper pot, which redirects a portion of the axial force from the end cap to the pepper pot, distributing the load across multiple paths and allowing for adjustable force distribution by modifying the design of the load distribution nut and end cap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end cap threads directly onto the high pressure vessel housing to seal the system, then the sealing function is achieved, but the axial load is fully transferred through the end cap threads causing fatigue and reduced functional lifespan
Solution Approach 1:
A load distribution nut is introduced as an intermediary component between the end cap and the pepper pot. This mediator redistributes the axial load from the end cap threads to both the end cap and the pepper pot, reducing the stress concentration on the end cap threads and preventing fatigue failure while maintaining the sealing function.
Solution Approach 2:
The axial load path is segmented into multiple paths: one through the end cap threads and another through the load distribution nut to the pepper pot. This segmentation distributes the previously concentrated load on the end cap threads across multiple structural elements, reducing fatigue and extending functional lifespan.
2Reliability
If the axial load is distributed to the pepper pot through a load distribution nut, then the fatigue on the end cap is reduced, but the device complexity increases
Solution Approach 1:
The load distribution nut serves multiple functions: it distributes the axial load to reduce end cap fatigue, maintains the sealing interface with the pepper pot, and provides a threaded connection point for the end cap. By combining these functions in a single component, the overall structural complexity is minimized while achieving the desired fatigue resistance.
3Reliability
If the load distribution nut is used to redirect axial force, then the load is distributed across multiple paths, but the manufacturing complexity increases
Solution Approach 1:
The load distribution nut's geometric parameters (inner diameter, outer diameter, thread specifications) are optimized to achieve effective load distribution while maintaining manufacturability. By carefully selecting these parameters, the component can be manufactured using standard machining processes and assembled with conventional threading operations, balancing performance with ease of manufacture.
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
This design reduces fatigue on the end cap by distributing the axial load across multiple paths, allowing for tailored load reduction or increase, thereby extending the functional lifespan of the hydraulic cylinder without increasing its weight.
Implementation Method 1
The piston is positioned within and translates axially along the pepper pot thereby pressurizing the working fluid within the pepper pot and directing an axial force toward the end cap and the load distribution nut
Implementation Method 2
The end cap is fixed to and encloses the casing via a first threaded interface. The load distribution nut is fixed to and encloses the pepper pot via a second threaded interface
Data Source
AI summary
A hydraulic cylinder with a load distribution nut connected to an end cap reduces fatigue experience by the end cap portion of the cylinder. The load distribution nut separates the axial load generated in the system from a single to multiple load paths. By introducing additional load paths, the load experienced by the traditional load path is reduced. Additionally, the load experienced by the end cap can be tailored by modifying the design of the load distribution nut and end cap. By either increasing or decreasing the surface area of the load distribution nut the axial load reduction on the end cap is correspondingly decreased or increased.