Fractured Piston Ring for Fluid Cylinder Assembly
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Solution Overview
Problem
The existing methods for attaching a sealing ring to a piston in a fluid pressure cylinder require multiple steps and jigs, complicating the piston structure and increasing assembly complexity.
Innovation Solution
A fluid pressure cylinder design featuring a piston with a fractured piston ring that can expand and contract, allowing the sealing ring to be easily fitted into a groove without the need for additional jigs, and utilizing backup and bearing rings to support and secure the sealing ring, reducing the complexity of the piston structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a sealing ring is attached to a piston using an attachment jig to increase diameter and then a correction jig to reduce diameter, then the sealing ring can be fitted into the accommodation groove, but the number of assembly steps increases and device complexity increases
Solution Approach 1:
The piston ring utilizes elastic deformation to temporarily change its diameter parameter. By applying radial outward forces through the backup ring and bearing rings, the fractured portion opens up, increasing the diameter to allow passage over the piston outer periphery. After positioning, the forces are released and the diameter returns to its original size, securing the ring in the accommodation groove without requiring correction jigs.
Solution Approach 2:
The piston ring structure itself provides the attachment mechanism through its fractured portion design. The elastic material and fractured geometry enable the ring to self-expand and self-secure when subjected to radial forces from the backup ring and bearing rings, eliminating the need for external attachment and correction jigs.
2Device complexity
If the piston structure is simplified by reducing the number of jigs, then device complexity decreases, but the attachment process may become more difficult
Solution Approach 1:
The backup ring and bearing rings act as intermediary elements that transmit radial forces to the piston ring's fractured portion. These intermediaries enable the attachment process by providing the necessary outward forces to expand the ring without requiring complex attachment jigs, thus simplifying the overall device while maintaining ease of operation.
3Reliability
If multiple jigs are used for attachment, then the sealing ring can be securely fitted, but the assembly time increases
Solution Approach 1:
The elastic piston ring with fractured portion automatically secures itself to the piston through the radial forces applied by the backup ring and bearing rings. This self-securing mechanism eliminates the need for time-consuming operations with correction jigs to reduce the diameter and fit the ring into the accommodation groove, significantly reducing assembly time while ensuring reliable fitting.
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
Simplifies the attachment process of the sealing ring, reduces the number of assembly steps, and minimizes deformation of the sealing ring during attachment, while maintaining effective sealing and pressure buffering capabilities.
Implementation Method 1
a piston ring that is held in a piston ring accommodation groove formed in the circumferential direction in an outer peripheral surface of the piston and comprises a fractured portion with which a diameter thereof can be increased and reduced
Data Source
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AI summary
A piston of a fluid pressure cylinder comprises a sealing ring interposed in a sealing ring accommodation groove, a piston ring that is interposed in a piston ring accommodation groove of the piston and comprises a fractured portion, and a backup ring that is attached to an outer peripheral surface 45 of the piston 4 and contacts the sealing ring and the piston ring. A groove for holding the backup ring is not required, and therefore a diameter of the piston can be reduced relative to the sealing ring. As a result, attachment of the sealing ring to the piston is simplified.