Valve Piston Seal With Undercut Retention for Low-Wear Sealing
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Solution Overview
Problem
Existing valves for turbochargers in motor vehicles require complex construction and additional fastening elements to ensure sealed abutment of the piston against the housing, leading to increased costs and potential detachment issues.
Innovation Solution
A valve design featuring a seal connected to the second housing part with an undercut region, eliminating the need for additional fastening elements and ensuring secure sealing through a fluorinated rubber seal and metal housing parts, with an axially acting seal that interacts only in the closed position to minimize friction and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a V-shaped seal is arranged in the housing with additional fastening elements to ensure sealed abutment, then sealing reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts and eliminates the additional fastening elements (clips, retaining rings, or other fixing components) from the conventional seal arrangement. Instead of using separate fastening elements, the seal is directly integrated into the housing through an undercut geometry that inherently secures the seal without requiring extra components, thereby simplifying the construction while maintaining sealing reliability.
Solution Approach 2:
The invention merges the sealing function and the fastening function into a single integrated design. The undercut geometry of the housing simultaneously provides both the sealing surface for the V-shaped seal and the retention mechanism to prevent seal detachment. This consolidation eliminates the need for separate fastening elements and reduces overall device complexity.
2Reliability
If additional fastening elements are used to secure the seal, then seal detachment prevention is improved, but manufacturing cost increases
Solution Approach 1:
The invention removes the need for additional fastening elements such as clips, retaining rings, or other fixing components. The undercut geometry inherent in the housing structure provides sufficient retention for the seal without requiring these extra parts, thereby reducing component count and manufacturing cost while maintaining reliable seal retention.
Solution Approach 2:
The housing structure provides self-service by incorporating the undercut geometry that automatically secures the seal in place. The geometry itself acts as the retention mechanism, eliminating the need for separate fastening elements and reducing manufacturing complexity and cost.
3Stability of the object's composition
If the seal is secured with additional components, then seal position stability is improved, but structural space requirements increase
Solution Approach 1:
The invention extracts and eliminates additional fastening components that would occupy extra space in the housing. The undercut geometry is integrated into the existing housing structure without requiring additional structural space, thereby maintaining seal position stability while avoiding increased space requirements.
4Ease of operation
If a simple translational or rotational movement is allowed for the seal, then seal installation is simplified, but seal detachment risk increases
Solution Approach 1:
The invention employs asymmetric undercut geometry in the housing that allows the seal to be installed in a specific direction while preventing removal in the opposite direction. The undercut creates a mechanical interlock that permits straightforward installation but blocks detachment, thereby maintaining ease of installation while ensuring reliable seal retention during operation.
Data Source
AI summary
A valve having a housing, a solenoid arranged in the housing, a pin movable by the solenoid, a piston connected to the pin, a second housing part that bears against the housing and which partially accommodates the piston, and a seal arranged between the second housing part and piston. The seal is connected to the second housing part. The seal surrounds a region of the second housing part such that the region forms at least one undercut for the seal.