Fluid Pressure Cylinder Compact Cap Design
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Solution Overview
Problem
Existing fluid pressure cylinders face challenges in minimizing their axial length while maintaining piston stroke length, requiring complex step-forming processes that increase manufacturing costs and complexity.
Innovation Solution
A fluid pressure cylinder design that forms a space for pressure fluid introduction without a stepped portion on the piston or cap, using a cap with a bent outer edge portion that locks into the cylinder chamber, allowing for a compact design and reduced manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a stepped portion is provided on the piston or cap to form a space for pressure fluid introduction, then the space formation is achieved, but the manufacturing complexity and cost increase due to step-forming processes
Solution Approach 1:
The invention extracts the space-forming function from the piston or cap body by introducing a separate spacer member. The spacer member is inserted into the cylinder chamber to form the necessary space between the cap and piston, eliminating the need for complex step-forming processes on the main components while achieving the same functional result.
2Length of moving object
If the total length of the fluid pressure cylinder is shortened, then the compactness is improved, but the stroke length of the piston may be compromised
Solution Approach 1:
The invention utilizes the radial dimension by extending the cap's outer edge portion outward to lock with the cylinder chamber wall. This allows the cap to serve multiple functions: blocking the open end, providing a mounting surface for the spacer member, and anchoring to the cylinder chamber. By exploiting the radial dimension, the axial length can be reduced without compromising the piston stroke length.
3Strength
If the cap's outer edge portion is extended and locked with the cylinder chamber, then the shock absorption is enhanced, but the cap structure becomes more complex
Solution Approach 1:
The cap is designed with an outer edge portion that serves multiple functions: it blocks the open end of the cylinder chamber, provides a mounting surface for the spacer member, locks to the cylinder chamber wall for structural support, and enhances shock absorption capability. By making the cap multi-functional, the invention avoids adding separate components for each function, thereby reducing overall device complexity while achieving enhanced shock absorption.
Data Source
AI summary
An open end of a cylinder main body is blocked by a cap, which includes a main body portion, and an outer edge portion that bends from the main body portion toward the open end of the cylinder main body, a distal end of the outer edge portion being locked with an inner circumferential wall. When a piston comes into abutment against the main body portion, a space is formed by the outer edge portion, the inner circumferential wall, and the end surface of the piston. A first port is disposed so as to communicate with the space, whereby the space serves as a space into which the pressure fluid is introduced.