Fluid Pressure Cylinder Joint Structure for Stress Relief and Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pressure resistant devices, such as fluid pressure cylinders, face challenges in maintaining forming precision and durability due to stress concentration at the joining portions, which can lead to cracks, and previous solutions that improve durability by forming grooves close to the joining area compromise positioning precision.
Innovation Solution
A pressure resistant device with a tubular main body and a lid portion joined by a welding process, where a positioning portion and a groove on the inner peripheral surface guide the force transmission, reducing stress at the joining area while maintaining precision through a back ring opposing the groove edge, allowing for precise alignment and reduced heat transfer during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove is formed close to the joining portion to reduce stress, then durability is improved, but positioning precision deteriorates
Solution Approach 1:
The device is divided into functional segments: the groove portion for stress reduction and the positioning portion for precision alignment. By separating these functions into distinct segments, the groove can be positioned close to the joining portion for durability without compromising positioning precision, as the positioning portion maintains its length and function independently.
Solution Approach 2:
Different regions of the inner peripheral surface are assigned different functions: the groove portion creates a force transmission path that reduces stress at the joining portion, while the positioning portion maintains length for precise alignment. This local differentiation of quality allows simultaneous optimization of both durability and positioning precision.
2Stress or pressure
If a groove is formed on the inner peripheral surface to narrow force transmission path, then stress at joining portion is reduced, but forming precision may be compromised
Solution Approach 1:
The inner peripheral surface is segmented into the groove portion and positioning portion. The groove portion narrows the force transmission path to reduce stress, while the positioning portion maintains sufficient length to ensure forming precision during manufacturing, resolving the contradiction between stress reduction and precision maintenance.
Solution Approach 2:
The positioning portion acts as an intermediary element that mediates between the groove portion and the joining portion. It ensures that the groove can be positioned optimally for stress reduction while maintaining the forming precision required during manufacturing, as the positioning portion provides the necessary dimensional stability.
Data Source
AI summary
A pressure resistant device includes a tubular main body portion, a lid portion having a wall portion joined to the main body portion, a positioning portion provided to oppose an inner peripheral surfaces of the main body portion and the wall portion, and a groove portion formed on the inner peripheral surface, and the positioning portion is provided to oppose an edge of the groove portion.