Cylinder Device Piston Ring Assembly Mechanism
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Solution Overview
Problem
The existing cylinder devices for vehicles face challenges in assembling the piston ring, which can lead to breakage and complexity, due to the need for radial expansion during assembly, and inefficiencies in assembling the stopper mechanism components.
Innovation Solution
A cylinder device configuration that includes a first cylinder with a piston rod, a rod guide, and a stopper mechanism with a second piston and a piston ring that is displaceable in an axial direction within a ring groove, allowing for easier assembly and integration of components, such as the stopper and castle, through metal flow, enhancing assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston ring is assembled into the ring groove by radial expansion, then the piston ring is retained in the ring groove, but the piston ring may be broken and the assembly process becomes complicated
Solution Approach 1:
The piston ring is divided into two separate members (first member and second member) that are assembled independently into the ring groove and then integrated together, eliminating the need for radial expansion of a complete ring and reducing assembly complexity while maintaining retention reliability
Solution Approach 2:
The first member and second member are assembled into the ring groove separately before being integrated, performing the assembly action in a preliminary stage when the ring is not yet closed, thereby avoiding the need for radial expansion and reducing the risk of breakage
2Reliability
If the stopper mechanism components are assembled traditionally, then the components are functional, but the work efficiency at assembly is low
Solution Approach 1:
The first member, second member, and piston ring are integrated together to form an integrated stopper mechanism assembly that is mounted as a single unit to the piston rod, reducing the number of separate assembly operations and improving work efficiency while maintaining the stopper mechanism's hydraulic cushioning function
Data Source
AI summary
A stopper mechanism includes a second cylinder provided at an end portion in an inner cylinder, and a second piston configured to move along with movement of a piston rod to be capable of being fit-inserted through the second cylinder. The second piston includes a stopper coupled to the piston rod, a castle integrated with the stopper by plastic flow to form a ring groove on an outer periphery of the second piston between the castle and the stopper, and a piston ring fixed into a ring groove formed by the stopper and the castle so that the piston ring is displaceable in the ring groove in an axial direction and is retained in the ring groove, and has an annular shape with both ends in a circumferential direction which are formed by partially cutting the piston ring.