Press Fitting Stop Ring Geometry for Low-Force Secure Assembly
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Solution Overview
Problem
Existing press fittings face challenges in manufacturing, particularly in avoiding damage to parts during assembly and achieving a secure, impact-resistant connection between the pressing sleeve and stop ring, especially when subjected to lateral forces.
Innovation Solution
The assembly group for the press fitting includes a cylindrical pressing sleeve with a stop ring that has a specific inner contour design with chamfers and projections, allowing for automatic tilting and centering, which reduces assembly forces and ensures secure clamping, even before the pressing sleeve is mounted on the fitting body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressing sleeve and stop ring are assembled using conventional methods, then the assembly process is simple, but high assembly forces cause damage to the fitting body and the connection is not secure against lateral impacts
Solution Approach 1:
The stop ring is pre-assembled onto the pressing sleeve before the pressing sleeve is mounted onto the fitting body. This preliminary assembly creates a tilted configuration that guides the pressing sleeve during insertion, distributing assembly forces more evenly and preventing damage to the fitting body while ensuring secure connection.
Solution Approach 2:
The stop ring features an asymmetric inner contour with a first circular segment having constant cross-section and a second circular segment with an inwardly projecting element. This asymmetric geometry creates a tilted axis of symmetry relative to the pressing sleeve, which guides proper alignment and reduces impact forces during assembly.
2Ease of manufacture
If the stop ring has a constant cross-section throughout, then manufacturing is simpler, but the connection is vulnerable to lateral impacts and assembly forces are not optimized
Solution Approach 1:
The stop ring employs different cross-sectional configurations in different regions: the first circular segment has a constant cross-section for simplicity, while the second circular segment includes an inwardly projecting element for enhanced connection security and impact resistance. This local differentiation optimizes both manufacturability and performance.
Data Source
AI summary
A mounting group for a press fitting is provided. The mounting group includes cylindrical pressing sleeve with a pressing area and a stop ring fixed to a first axial end of the pressing sleeve and limiting the pressing area in an axial direction of the pressing sleeve. The stop ring has a first inner contour on a side opposite the pressing area and as a first circular segment and a second circular segment, which extends over a smaller part of the first inner contour than the first circular segment. The stop ring has a constant cross-section in the region of the first circular segment and an element arranged in the region of the second circular segment which projects inwardly beyond the constant cross-section of the first circular segment and causes a tilting of an axis of symmetry of the pressing sleeve.