Hydraulic Shock Absorber Stopper Mechanism Design
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Solution Overview
Problem
Conventional hydraulic shock absorbers for vehicles have complex structures and significant impacts when the piston rod extends maximally, necessitating a simplification of the mechanism to reduce these effects.
Innovation Solution
A cylinder apparatus with a simplified stopper mechanism comprising a second cylinder, a second piston, and a piston ring with axial and radial abutment portions, along with a cushion member, to absorb the impact and prevent complete extension of the piston rod, using a smaller number of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional hydraulic stopper mechanism is used to prevent complete extension of the piston rod, then the cushion function is provided, but the structure becomes complex and the impact when the piston rod extends maximally is significant
Solution Approach 1:
The stopper mechanism is segmented into functional components: the second piston with circumferential groove, the piston ring with cutout portion, and the hydraulic fluid. This segmentation allows each component to perform its specific function while collectively providing the cushion effect with fewer parts than conventional mechanisms.
Solution Approach 2:
The invention uses hydraulic fluid trapped between the piston ring and the end surface of the second piston to provide the cushion function. When the piston rod extends maximally, the hydraulic fluid resists compression, creating a cushioning effect without requiring complex mechanical stopper mechanisms.
2Reliability
If a conventional hydraulic stopper mechanism is used to provide cushion function, then the piston rod extension is prevented, but the number of parts increases and assembly efficiency decreases
Solution Approach 1:
The invention merges the stopper function with the existing piston and cylinder structure. The second piston and piston ring are integrated into the hydraulic system, combining the stopping function with the hydraulic fluid already present in the system, thereby reducing the number of separate parts and simplifying assembly.
Solution Approach 2:
The piston ring serves multiple functions: it seals the hydraulic fluid, provides the cushioning effect through its interaction with the end surface, and prevents complete extension of the piston rod. This multi-functionality reduces the need for separate components.
3Productivity
If a simplified stopper mechanism with fewer parts is used, then assembly efficiency is improved, but the cushion function may be insufficient
Solution Approach 1:
The cushion function is achieved by controlling the parameters of the hydraulic fluid system, specifically the volume of fluid trapped between the piston ring and end surface, and the area of the circumferential groove. By adjusting these parameters, the cushioning effect can be optimized to provide sufficient protection while maintaining a simple structure.
Solution Approach 2:
The hydraulic fluid acts as an intermediary between the piston rod and the end surface of the second piston. Instead of direct mechanical contact, the hydraulic fluid transmits and cushions the impact forces, providing an effective stopper function with minimal components.
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 effectively reduces the impact during maximal extension of the piston rod while minimizing the number of parts, enhancing assembly efficiency and reducing costs, and improving the hydraulic shock absorber's performance by providing a hydraulic cushion effect.
Implementation Method 1
a first cylinder sealingly containing hydraulic fluid, a first piston slidably fitted in the first piston and dividing an inside of the first cylinder
Implementation Method 2
the piston ring has ends in a circumferential direction by being partially cut off. The piston ring includes axial abutment portions axially abuttable against each other, and radial abutment portions radially abuttable against each other, at the both ends of the piston ring. A first passage is formed between an end surface of the piston ring and the one-side end surface
Data Source
AI summary
A stopper mechanism includes a second cylinder disposed at an end in a first cylinder, a second piston disposed so as to be able to move according to a movement of a piston rod to be fitted into the second cylinder, and an annular piston ring having ends in a circumferential direction by being partially cut off. A circumferential groove is formed on an outer circumferential of the second piston. The circumferential groove includes a bottom surface, a one-side end surface, and an opposite-side end surface. The piston ring is axially movably disposed in the circumferential groove. The piston ring includes axial abutment portions, and radial abutment portions at the both ends of the piston ring. When the piston ring abuts against the one-side end surface of the circumferential groove, a first passage is forced between the one-side end surface and an end surface of the piston ring.