Hydraulic Coupling Sleeve Structure for Leak-Stable Sealing
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Solution Overview
Problem
Conventional hydraulic coupling devices face issues with radial expansion of the outer sleeve during the drive-up operation, which can lead to increased radial clearance and potential oil leakage, as well as the risk of the seal being tilted.
Innovation Solution
The design incorporates a separate cylinder secured to the outer sleeve, with part of the nut extending into the cylinder, creating a chamber that is less impacted by the radial expansion of the outer sleeve, allowing for a more compact device and enabling the use of different materials for the cylinder and outer sleeve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer sleeve is radially expanded during drive-up operation, then the inner sleeve is compressed onto the shafts creating an interference fit, but the radial clearance between the nut and outer sleeve increases and the seal may tilt causing oil leakage
Solution Approach 1:
The device is divided into separate functional components: the outer sleeve that expands to create interference fit, and the cylinder that remains dimensionally stable to house the seal and maintain sealing clearance. This segmentation allows each component to perform its specific function without compromising the other.
Solution Approach 2:
The cylinder acts as an intermediary structure between the expanding outer sleeve and the seal. It provides a stable reference frame that is not affected by the radial expansion of the outer sleeve, thereby maintaining the sealing clearance and preventing seal tilting.
2Strength
If the outer sleeve is made thicker to provide sufficient drive-up force, then the interference fit is improved, but the device becomes larger in radial direction
Solution Approach 1:
The functional requirements are segmented between the outer sleeve (which provides drive-up force through radial expansion) and the cylinder (which provides structural support and houses the sealing mechanism). This allows the outer sleeve to be thinner than it would need to be if it had to provide both drive-up force and structural support.
Solution Approach 2:
The device uses composite construction with the outer sleeve and cylinder as separate components that can be made from different materials optimized for their specific functions. The outer sleeve can be made from material optimized for elastic deformation, while the cylinder can be made from material optimized for structural stability.
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 mitigates the risks of oil leakage and seal tilting, achieves a more compact radial structure, and allows for the use of materials with varying mechanical properties, enhancing the overall performance and reliability of the hydraulic coupling device.
Implementation Method 1
a hydraulic chamber intended to be filed by oil or similar liquid
Implementation Method 2
The hydraulic coupling device further comprises a piston or nut screwed on the inner sleeve and delimiting together with the inner and outer sleeves a hydraulic chamber intended to be filed by oil or similar liquid
Implementation Method 3
The outer surface of the inner sleeve is slightly tapered and the bore of the outer sleeve has a corresponding taper
Implementation Method 4
A seal is proved on the nut to avoid an escape of oil from the chamber between the nut and the inner and outer sleeves
Implementation Method 5
This compresses the inner sleeve onto shafts creating an interference fit
Data Source
AI summary
A hydraulic coupling device includes an inner sleeve having a tapered outer surface, an outer sleeve having a tapered inner surface mounted on the tapered outer surface of the inner sleeve, a nut screwed onto the inner sleeve and a cylinder formed separately from the outer sleeve and secured to the outer sleeve. At least a portion of the nut extends into the cylinder, and the inner sleeve, the cylinder, the nut and the outer sleeve together delimit a chamber.