Slave Cylinder Sealing Ring with Support Rings
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Solution Overview
Problem
Existing slave cylinders for hydraulic release systems in clutches experience significant volume absorption and hysteresis issues due to the sealing ring design, leading to inefficiencies and play when under load.
Innovation Solution
A slave cylinder design featuring a Y-shaped sealing ring with axially extending sealing necks and diverging sealing lips, supported by outer and inner ring members, which are form-fitted and sealed to minimize volume increase and hysteresis, ensuring a tight connection between the sealing lips and housing/guide tube under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a sealing ring is used on the annular piston without additional support structures, then the device complexity is reduced, but the volume absorption and hysteresis increase significantly under pressure
Solution Approach 1:
The sealing system is segmented into multiple functional components: the sealing ring itself, outer ring members for radial support, and inner ring members for axial support. This segmentation allows each component to perform its specific function optimally, reducing volume absorption and hysteresis while maintaining manageable complexity through modular design
Solution Approach 2:
The sealing system uses composite construction combining different materials with complementary properties: the sealing ring material for sealing, and the ring members materials for structural support. This composite approach optimizes both sealing performance and mechanical stability under pressure
2Reliability
If the sealing ring is made larger to improve sealing, then the sealing performance improves, but the volume absorption increases
Solution Approach 1:
Instead of uniformly increasing the sealing ring size, the invention applies local quality enhancement through strategically positioned ring members that provide support only where needed - radially at the outer ring members and axially at the inner ring members. This localized support improves sealing effectiveness without proportionally increasing overall volume
3Reliability
If the sealing ring is constrained rigidly to reduce hysteresis, then the play is eliminated, but the sealing ring cannot accommodate pressure-induced expansion
Solution Approach 1:
The sealing system employs dynamic characteristics where the sealing ring can elastically deform under pressure to maintain contact with sealing surfaces, while the ring members provide controlled constraints that prevent excessive movement. This dynamic balance eliminates play and reduces hysteresis while allowing necessary pressure accommodation
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
The solution significantly reduces volume absorption and hysteresis, maintaining a tight seal and eliminating play, even under pressure, thereby enhancing the sealing performance and reliability of the hydraulic release system.
Implementation Method 1
when pressure is applied to the pressure chamber
Implementation Method 2
The sealing ring includes an axially extending sealing neck or sealing area... ensures a tight seal
Data Source
Figure 1~2
AI summary
The invention relates to a slave cylinder for a hydraulic disengagement arrangement for operating a clutch, having a cylindrical housing (1) and a cylindrical guide tube (3) arranged concentrically thereto and radially spaced therefrom, which between them form an annular pressure chamber (4) in which an annular piston (5) is arranged so as to be axially displaceable. The annular piston has a sealing ring (6) on the face facing towards the pressure chamber. The sealing ring has an axially running sealing region (11). An outer annular part (17) is arranged between the outside of the sealing region and the cylindrical inner face of the housing. An inner annular part (18) is correspondingly arranged between the inside of the sealing region and the cylindrical outer face of the guide tube. As a result, when pressure acts on the sealing ring, the sealing region is supported by way of the outer annular part at the inner face of the housing and by way of the inner annular part at the outside of the guide tube.