Fluid Pressure Cylinder Piston Cover Design
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Solution Overview
Problem
Existing fluid pressure cylinders face increased manufacturing costs and reduced ease of assembly due to the need for separate grooves for the damper and guide members, which also limits the piston's length and requires integral formation of the damper and piston packing from the same material, making it difficult to achieve desired capabilities and assembly.
Innovation Solution
A fluid pressure cylinder design featuring a piston with a cover member that includes a damper portion and a groove on the outer surface, allowing for shock absorption and guiding without the need for separate end surface grooves, reducing the number of parts and assembly steps, and enabling different material choices for the damper and piston packing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate installation grooves are formed for the damper and guide member on the piston, then the damper and guide member can be mounted separately, but the lengthwise dimension of the piston must be increased, making the fluid pressure cylinder larger in scale
Solution Approach 1:
The patent combines the damper and guide member into a single integrated component mounted on the piston rod end. This merging eliminates the need for separate installation grooves for both components, allowing them to be installed together in a compact arrangement that does not increase the piston's lengthwise dimension, while still maintaining ease of assembly as a single unit.
Solution Approach 2:
The integrated component serves multiple functions simultaneously - it acts as both a damper for shock absorption and a guide member for directional guidance. This multi-functional design allows a single component to replace what would traditionally require separate components and installation grooves, thereby reducing the piston's lengthwise dimension while maintaining assembly ease.
2Device complexity
If the damper and piston packing are formed integrally from the same material, then the structure is simplified, but the desired capabilities cannot be fulfilled when different materials and hardness are required
Solution Approach 1:
The patent segments the damper and piston packing into separate components rather than forming them integrally. This allows each component to be made from optimally suited materials with appropriate hardness levels - the damper can use softer elastic material for shock absorption while the piston packing can use harder wear-resistant material for sealing, thereby fulfilling desired functional capabilities without excessive structural complexity.
Solution Approach 2:
Different materials and properties are applied to different locations - the damper uses elastic material with specific hardness for shock absorption at the impact location, while the piston packing uses different material properties suited for sealing at its location. This local quality approach ensures each component has the optimal material properties for its specific function while maintaining overall structural simplicity.
3Quantity of substance
If the outer diameters of the annular grooves for piston packing and wear ring are substantially the same as the outer diameter of the piston, then the components can be installed, but the installation procedure becomes difficult and ease of assembly is decreased
Solution Approach 1:
The patent creates an asymmetric stepped groove structure where the buffering body retention groove has a different diameter than the outer circumferential surface of the piston. This asymmetric design with varying groove diameters provides clearance and space for easier installation of the piston packing and wear ring, thereby improving ease of assembly while maintaining proper component fit.
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 manufacturing costs, enhances assembly ease, and allows for a more compact piston, improving durability and manufacturability by separating the damper and piston packing materials and eliminating the need for complex groove formation on the piston's end surface.
Implementation Method 1
a damper made from an elastic material is mounted on an end surface of the piston, with the aim of absorbing shocks when the piston comes into abutment against a wall surface
Data Source
AI summary
A piston is provided displaceably in the interior of a cylinder tube that constitutes a fluid pressure cylinder, and a piston cover made from an elastic material is disposed so as to cover one end surface of the piston. The piston cover comprises a main body portion confronting a head cover of the cylinder tube, a guide portion covering an outer circumferential surface of the piston and disposed in sliding contact with an inner circumferential surface of a cylinder hole, and a hook portion folded toward an inner circumferential side with respect to the guide portion. Upon displacement of the piston toward the head cover, shocks are absorbed by abutment of the main body portion against the head cover. When the piston is displaced along the cylinder tube, the guide portion serves to guide the piston in the axial direction by sliding contact with the cylinder hole.