Press Fitting Deformations Prevent Axial Displacement
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Solution Overview
Problem
Existing hose couplings for high-pressure hydraulic lines face issues with secure mounting, high material costs, and risk of axial displacement leading to cracks or nipple collapse due to axial deformation during pressing.
Innovation Solution
A sleeve-like press fitting design with radially directed deformations and corresponding indentations on the outside, which absorb material during pressing, maintaining the length and preventing axial displacement, and incorporating a spiral or asymmetrical deformation for enhanced gripping and self-locking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-part press fitting with projections is used to securely hold the hose, then mounting security is improved, but axial displacement occurs during pressing leading to cracks and reduced service life
Solution Approach 1:
The press fitting is divided into multiple circumferential deformations (protrusions) that engage the hose independently. Each deformation acts as a separate gripping element, distributing the holding force around the hose circumference. This segmentation allows secure mounting while reducing overall axial displacement compared to a single continuous grip structure.
Solution Approach 2:
The solution transitions from axial engagement to radial engagement by creating deformations that protrude radially inward toward the hose. The deformations are arranged circumferentially and engage the hose in the radial direction, converting axial pressing force into radial gripping force. This dimensional change prevents axial displacement of the press fitting relative to the hose.
2Reliability
If traditional press fitting designs are used, then secure mounting is achieved, but material costs are high and production is expensive
Solution Approach 1:
The press fitting combines the hose-holding function and the structural support function into a single integrated component. The deformations serve dual purposes: they provide gripping force on the hose while also forming the structural body of the press fitting. This merging eliminates the need for separate projection elements or additional components, reducing material usage and production complexity.
Solution Approach 2:
The design changes the geometric parameters of the press fitting by using deformations with specific dimensional relationships. The deformations have optimized heights, spacing, and radial dimensions that provide adequate gripping force while minimizing material consumption. This parameter optimization allows secure mounting with reduced material costs compared to traditional over-engineered designs.
3Reliability
If radial pressure is applied during pressing to secure the hose, then mounting security is improved, but axial displacement occurs leading to nipple collapse and hose damage
Solution Approach 1:
The deformations are designed with curved, radially-oriented surfaces that distribute pressing forces evenly across the hose circumference. The radial geometry of the deformations ensures uniform stress distribution, preventing localized stress concentrations that could cause nipple collapse or hose damage during the pressing operation.
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
Ensures secure and cost-effective mounting with reduced material usage, prevents axial displacement and nipple collapse, and provides a self-locking mechanism for reliable hose connection, even under overpressing conditions.
Implementation Method 1
the press fitting is designed as a sleeve or comprises a sleeve as a sleeve-like part. This sleeve has deformations in the form of projections that run radially to the hose and are directed toward the hose, and indentations on the outside of the jacket of the sleeve in the region of the deformations. In this case, the indentations absorb material areas of the deformations when they are transferred to the fastening case.
Implementation Method 2
protrusions located inside the hose coupling engage for attachment to the hydraulic hoses. In order to provide the hose coupling with a hose, a hose is pushed onto the coupling element, the hose already having the press fitting. For attachment, a radial pressure is then applied from the outside to the outer socket in order to press the projections located on the inside against the hose.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The coupling (10) has a tube-like coupling unit (11) whose one end is attachable to a tap and other end comprises a press nipple (24) for receiving a hose (13). A cylinder-form press support (12) fixes the hose at the coupling unit. The press support is formed as a cover (17). The cover running radially towards the hose has deformations, which are designed as projections, at the hose. Recesses (20) are provided at the outer side of the press support in the area of deformations. The recesses receive the material regions of deformations when they are attached to the deformations.