Valve Stem Seal Reinforcing Ring Curved Locking Protrusion
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Solution Overview
Problem
Conventional valve stem seals face issues with the structural strength of locking protrusions, leading to potential detachment and impaired sealing performance, and also suffer from low workability during mounting due to the risk of the locking protrusion getting caught by the valve stem guide.
Innovation Solution
A valve stem seal design featuring a reinforcing ring with a cylindrical portion and an inward flange, where the locking protrusion is formed by a curved portion recessed radially inward from the slit, enhancing structural strength and allowing for improved workability by being deformable during mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the locking protrusion is formed by folding an inner-side portion of a slit radially inward, then the locking protrusion can be formed with simple structure, but the structural strength of the locking protrusion is insufficient and it may break when pressure rises
Solution Approach 1:
The locking protrusion is formed as a curved portion that is gradually recessed radially inward from the side opposite to the inward flange portion with respect to the slit, rather than a sharp folded edge. This curved geometry distributes stress more effectively and prevents stress concentration, thereby enhancing the structural strength of the locking protrusion while maintaining simple formation process
2Strength
If two slits extending linearly in circumferential direction are provided on reinforcing ring, then the strength of locking protrusion can be enhanced, but workability is reduced due to likelihood of locking protrusion getting caught by tip of valve stem guide during mounting
Solution Approach 1:
The curved geometry of the locking protrusion allows it to flex and deform during the mounting process, enabling it to pass through the valve stem guide tip without getting caught. The curvature provides a gradual transition that reduces the risk of snagging while maintaining the strength benefits of the recessed design
3Ease of manufacture
If locking protrusion is made with simple folded structure, then manufacturing is easier, but the locking protrusion may break when pressure inside sealed space rises
Solution Approach 1:
The curved recessed structure provides inherent stress distribution that prevents crack initiation and propagation under pressure loading. The gradual curvature eliminates sharp corners where stress concentration would occur, thereby improving reliability while maintaining manufacturability through standard forming processes
Data Source
AI summary
A valve stem seal exhibits superior workability of mounting of a reinforcing ring to a valve stem guide and enables the reinforcing ring to be fixed to the valve stem guide in a stable manner. A reinforcing ring is mounted to a valve stem guide by fitting a cylindrical portion to the valve stem guide from a side opposite to an inward flange portion. The cylindrical portion includes a slit extending linearly in a circumferential direction and a locking protrusion that is provided on a side opposite to the inward flange portion with respect to the slit and that is to be locked by a locking recess formed in the valve stem guide. The locking protrusion is constituted by a curved portion that is gradually recessed radially inward from the side opposite to the inward flange portion with respect to the slit to a position that reaches the slit.