Seal Ring Convex Sections Reduce Friction During Cylinder Assembly
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Solution Overview
Problem
Increasing the volume of a seal ring to enhance sealability can make its assembly into a cylinder device more difficult due to increased frictional resistance and potential interference with the cylinder and annular member.
Innovation Solution
The seal ring is designed with convex sections that protrude radially, allowing for partial volume increase in the axial direction, which reduces frictional resistance during assembly while maintaining improved sealability by ensuring proper contact with the cylinder and annular member, and is integrally formed with the closing section for easier assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the volume of the seal ring is increased to enhance sealability, then sealability is improved, but assembly becomes difficult due to increased frictional resistance
Solution Approach 1:
The seal ring is divided into multiple seal sections (front end side outer circumferential seal section, base end side outer circumferential seal section, front end side inner circumferential seal section, base end side inner circumferential seal section) along the axial direction. This segmentation allows each section to independently contact the cylinder and annular member, providing effective sealing without requiring a large overall volume, thus facilitating easier assembly.
Solution Approach 2:
The seal ring has different structural characteristics at different locations: the outer circumferential seal sections have larger contact areas with the cylinder for effective sealing, while the inner circumferential seal sections have optimized geometry for contacting the annular member. This local differentiation ensures adequate sealability at each interface without uniformly increasing the entire seal ring volume, maintaining assembly feasibility.
2Reliability
If the volume of the seal ring is increased to ensure proper contact with cylinder and annular member, then sealability is improved, but the seal ring interferes with the cylinder and annular member during assembly
Solution Approach 1:
The seal ring employs a multi-sectional structure distributed along the axial dimension rather than increasing radial thickness uniformly. The front end side and base end side seal sections are arranged at different axial positions, allowing the seal ring to achieve adequate contact with both the cylinder and annular member through strategic axial distribution rather than radial expansion, thereby reducing assembly interference.
3Reliability
If the seal ring is designed with multiple seal sections to improve sealing, then sealability is enhanced, but the structural complexity increases
Solution Approach 1:
The seal ring integrates multiple functional seal sections into a single unified component that contacts both the cylinder and annular member. By merging the front end side outer circumferential seal section, base end side outer circumferential seal section, front end side inner circumferential seal section, and base end side inner circumferential seal section into one piece, the design achieves comprehensive sealing without requiring multiple separate parts, thus managing structural complexity effectively.
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 improves the assembly property of the seal ring by reducing frictional resistance and ensuring effective sealing without compromising sealability, even when foreign substances are present, thus enhancing the overall yield and reliability of the cylinder device.
Implementation Method 1
The convex sections come in contact with the outer circumferential portion of the annular member to press the front end side outer circumferential seal section and the base end side outer circumferential seal section outward in the radial direction
Data Source
AI summary
A cylinder device includes; a cylinder; a rod protruding from the cylinder; an annular member formed at one end side of the cylinder; an annular closing section formed further outward in a cylinder inward/outward direction than the annular member to close the one end side of the cylinder; and an annular seal ring provided inward in the cylinder inward/outward direction from an outer circumferential side of the closing section. The seal ring includes: a front end side outer circumferential seal section; a base end side outer circumferential seal section; a front end side inner circumferential abutting section; and a base end side inner circumferential abutting section. At least one set of seal sections or abutting sections is constituted by convex sections protruding in a radial direction.