Hydraulic Stroke Stop Ring Guide Locking Under High Pressure
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Solution Overview
Problem
Existing hydraulic damper stop arrangements fail to maintain a secure lock during high-speed movements due to pressure-induced unlocking and potential blocking of the ring guide within the annular gap, leading to reduced operational length and effectiveness.
Innovation Solution
The ring guide is secured with self-locking assembly clips and fixing protrusions that engage in an annular groove of the piston rod, with a design that includes a larger fixing protrusion height than the radial clearance and additional radial channels for improved holding and fluid connection, ensuring the ring guide remains locked even under high pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fixing protrusion height is increased to prevent pressure-induced unlocking during high-speed movement, then the reliability of the ring guide locking is improved, but the axial length of the retaining surface is reduced, which decreases the operational length of the hydraulic stop arrangement
Solution Approach 1:
The invention transitions from a purely axial retention mechanism to a radial engagement mechanism. The fixing protrusions extend radially inwardly from the inner axial rim of the ring guide to engage annular slots in the piston rod, creating a three-dimensional locking structure that combines radial fixing protrusions with axial retaining surface, thereby solving the contradiction between locking reliability and operational length.
2Reliability
If the radial clearance between the inner axial rim and the ring is reduced to prevent blocking, then the reliability is improved, but the ease of assembly and manufacturing precision requirements are worsened
Solution Approach 1:
The invention divides the retention mechanism into two independent functional elements: fixing protrusions for radial engagement and a retaining surface for axial retention. This segmentation allows the radial clearance to be optimized for blocking prevention while the axial retaining surface provides additional security, reducing the overall system's dependence on precise radial clearance control alone.
3Productivity
If the axial length of the retaining surface is reduced to increase the working distance of the stroke stop arrangement, then the productivity is improved, but the holding function of the ring guide is weakened
Solution Approach 1:
The invention compensates for the reduced axial retaining surface length by introducing radial fixing protrusions that engage with annular slots in the piston rod. This dimensional transition from axial to radial engagement maintains the holding function while allowing the axial retaining surface to be shortened, thereby increasing the working distance of the stroke stop arrangement.
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 holding function of the ring guide, prevents blocking, and increases the working distance of the stroke stop arrangement, providing a smooth increase in damping force and improved operational efficiency.
Implementation Method 1
The ring guide and the ring form a return valve that opens when the additional piston assembly is in the narrowed section of the tube and the direction of the stroke changes to opposite to the direction of the activation of the stop arrangement.
Implementation Method 2
the at least one fixing protrusion is disposed at said inner axial rim of said ring guide and the height of said at least one fixing protrusion is larger than said radial clearance between said inner axial rim of said ring guide and said ring
Implementation Method 3
an additional piston assembly having a diameter smaller than the diameter of the tube, displaceable along with the main piston assembly configured to be slidably disposed in the narrowed section to generate additional damping force
Data Source
AI summary
The disclosure relates to a hydraulic damper provided with an additional stroke stop arrangement comprising a narrowed section and an additional piston assembly, wherein the additional piston assembly comprises a plastic ring guide, a ring, and a retaining member, wherein the ring surrounds an inner axial rim of the ring guide with radial clearance, wherein the inner axial rim defines at least one annular channel, and wherein the ring guide has at least one fixing protrusion extending radially inwardly toward the axis for engaging an annular slot in the piston rod and securing the ring guide to the piston rod. The at least one fixing protrusion is disposed at said inner axial rim of said ring guide and the height of said at least one fixing protrusion is larger than said radial clearance between said inner axial rim of said ring guide and said ring.