Hydraulic Coupling Sleeve Joint for Leak-Stable Drive-Up
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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 oil leakage due to tilting of the seal and require final machining with a dummy shaft, complicating the assembly process.
Innovation Solution
The design incorporates a separately secured cylinder with a high-friction coating or protrusions on its frontal faces, which reduces the impact of radial expansion and allows for torque transmission similar to conventional devices, enabling final machining without a dummy shaft and using different materials with varying mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer sleeve is radially expanded during drive-up operation, then the coupling device achieves proper mounting position, but the seal may tilt leading to oil leakage
Solution Approach 1:
The device is divided into separate components: the outer sleeve and the cylinder are made separately and secured together. This segmentation allows the cylinder to be designed with specific friction characteristics that compensate for the radial expansion of the outer sleeve, preventing seal tilting and oil leakage while maintaining reliable sealing during the drive-up operation.
Solution Approach 2:
The frontal face of the cylinder is provided with a coating having a specific coefficient of friction (at least 0.3, preferably at least 0.45). This parameter change in surface friction characteristics allows the cylinder to resist radial expansion forces during drive-up, maintaining seal stability and preventing oil leakage while enabling proper mounting.
2Ease of operation
If the outer sleeve is radially expanded during drive-up, then mounting is achieved, but final machining requires dummy shaft usage complicating assembly
Solution Approach 1:
The cylinder is provided with a frontal face that can be machined to precise dimensions before mounting the hydraulic coupling device. This preliminary action allows final machining to be completed on the cylinder itself prior to assembly, eliminating the need for dummy shafts during the mounting process and simplifying the overall assembly procedure.
3Power
If a cylinder with high-friction coating is used, then torque transmission capacity is maintained, but manufacturing complexity increases
Solution Approach 1:
The cylinder's frontal face is coated with material having a high coefficient of friction (at least 0.3, preferably at least 0.45). This parameter change in surface friction enables the cylinder to transmit torque effectively while compensating for radial expansion during drive-up. The coating can be applied as a separate manufacturing step, maintaining torque transmission capacity without fundamentally changing the cylinder's basic structure.
4Adaptability or versatility
If the cylinder and outer sleeve are made from different materials, then mechanical properties can be optimized, but manufacturing complexity increases
Solution Approach 1:
The outer sleeve and cylinder are made separately from different materials or with different mechanical properties, allowing each component to be optimized for its specific function. The outer sleeve can be designed for radial expansion characteristics while the cylinder can be optimized for friction and torque transmission. This segmentation enables material optimization without requiring complex multi-material construction in a single piece.
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 enhances the stability of the connection, prevents oil leakage, and allows for efficient torque transmission while simplifying the assembly process by enabling machining before mounting, using different materials and maintaining the torque capacity of conventional devices.
Implementation Method 1
at least one of these frontal faces is provided with a coating having a coefficient friction higher that of the frontal face
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. The cylinder abuts axially against the outer sleeve to form a j oint. At least part of the nut extends into the cylinder, and the cylinder, the nut and the outer sleeve together delimit a chamber. A friction enhancing coating is provided between the cylinder and the outer sleeve and/or at least one protrusion extends from one of the outer sleeve or cylinder into a complementary recess in the other of the outer sleeve or cylinder.