Cushion Ring End Guide Face for U-Packing Protection
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Solution Overview
Problem
Existing cushion rings with V-shaped throttling grooves can damage U-packings in fluid-pressure cylinders due to direct collision with jet streams during operation.
Innovation Solution
Incorporating an end guide face in the throttling groove that rises outwardly to prevent the jet stream from colliding with the U-packing, ensuring the groove's design guides the fluid flow away from the U-packing, thus protecting it from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a V-shaped throttling groove is provided in the cushion ring, then the cushioning function is improved, but the U-packing may be damaged due to direct collision with the jet stream
Solution Approach 1:
The patent introduces an end guide face as an intermediary element between the throttling groove and the U-packing. This guide face redirects the jet stream from the throttling groove away from the U-packing, preventing direct collision. The end guide face acts as a mediator that changes the flow direction of the working fluid, thereby protecting the U-packing from damage while maintaining the cushioning function.
Solution Approach 2:
The patent converts the potentially harmful jet stream that would damage the U-packing into a beneficial controlled flow. By designing the end guide face with specific geometry, the high-velocity fluid flow is redirected to perform useful work (cushioning) without causing damage. The harmful kinetic energy of the jet stream is transformed into a controlled flow pattern that achieves the desired cushioning effect while protecting sensitive components.
2Force
If the throttling groove is designed to throttle the flow quantity, then the shock cushioning is improved, but the jet stream velocity increases causing potential damage
Solution Approach 1:
The patent addresses the velocity issue by changing the spatial dimension of fluid flow control. Instead of only controlling flow in the axial direction, the end guide face introduces a radial or angular component to the flow path. This dimensional change allows the fluid to be redirected at an angle, reducing the axial velocity component that would otherwise directly impact and damage the U-packing while maintaining the throttling effect for shock cushioning.
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 end guide face effectively redirects the jet stream, preventing damage to the U-packing and enhancing the cushioning function by maintaining the fluid's flow path without compromising the U-packing's integrity.
Implementation Method 1
a throttling groove 1a having a V-shaped cross section, which extends from an appropriate position in the axial direction of the cushion ring 1 to a rod-side end part, is provided at the outer periphery of the cushion ring 1, so as to throttle the flow quantity of working fluid flowing from a rod-side fluid chamber A to an input/output port 5a
Implementation Method 2
an end guide face 1b for guiding the working fluid flowing in the throttling groove 1a toward the slantwise outward direction of the cushion ring 1 is provided in the rod-side end part of the throttling groove 1a
Data Source
AI summary
A cushion ring which is used between a rod-side cylinder head and a piston rod of a fluid-pressure cylinder and which is externally fitted on the piston rod to cushion a shock in the vicinity of the farthest extended end of cylinder includes a throttling groove that has a V-shaped cross section. The throttling groove extends from an appropriate position of the cushion ring to a rod-side end part and functions to throttle the flow of a working fluid flowing from a rod-side fluid chamber to an input/output port provided in a rod-side cylinder head. The throttling groove is provided at the outer periphery of the cushion ring. The throttling groove terminates at a rod-side end part with an end guide face that guides the working fluid toward a slantwise outward direction of the cushion ring.