Shock Absorber Rebound Stop on Outer Tube
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Solution Overview
Problem
Traditional single-tube shock absorbers face stress and potential deterioration during the rebound phase due to the piston rod absorbing shock, leading to a limited lifespan.
Innovation Solution
A single-tube shock absorber design where the axial guide sleeve, with an annular piece carrying an elastic means, redirects the rebound force away from the piston rod, using an elastic stopper positioned between the inner and outer tubes to absorb shocks, ensuring the force is transmitted without passing through the main piston rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rebound stop is positioned on the piston to dampen shock during rebound contact, then the shock during rebound is dampened, but the piston rod is violently stressed and can lead to its deterioration
Solution Approach 1:
The rebound stop function is extracted from the piston assembly and relocated to the outer tube. The rebound stop is now positioned on the outer tube at a location that prevents contact with the piston during normal operation, thereby eliminating the stress transmission path to the piston rod while maintaining shock absorption capability
Solution Approach 2:
A new structural arrangement is introduced where the rebound stop on the outer tube acts as an intermediary element. When the piston contacts the rebound stop during rebound, the force is transmitted through the outer tube structure rather than through the piston rod, serving as a mediator that protects the piston rod from violent stresses
2Ease of operation
If the inner tube is allowed to move freely in the outer tube, then the shock absorber can respond to road irregularities, but the piston rod is subjected to violent stresses during rebound contact
Solution Approach 1:
The rebound stop function is extracted from the piston assembly and relocated to the outer tube. The rebound stop is now positioned on the outer tube at a location that prevents contact with the piston during normal operation, thereby eliminating the stress transmission path to the piston rod while maintaining shock absorption capability
Solution Approach 2:
Instead of placing the rebound stop on the moving piston component, the invention inverts the approach by placing it on the stationary outer tube. This inversion changes the force transmission path from piston-rod to outer-tube structure, protecting the piston rod while maintaining the necessary movement freedom
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 configuration effectively absorbs rebound shocks without stressing the piston rod, thereby extending its lifespan and preventing damage, ensuring consistent performance.
Implementation Method 1
said annular part carries an elastic means capable of being compressed in abutment by a compression member linked to the structure of said inner tube
Data Source
Figure 1
Figure 2
AI summary
The absorber (100) has an inner tube (14) displaced in an outer tube (12), and a main piston (24) sliding inside the inner tube. The piston is connected to a bottom end (20) of the outer tube by a piston rod (18). An axial guiding sleeve (40) is positioned between the tubes and is terminated at its lower part by an annular piece i.e. cylindrical ring (44), which closes a cavity between the tubes. The piece carries an elastic unit e.g. rebound stop (136), which is compressed in thrust by a compression unit e.g. rebound stop surface (134), that is connected to a structure of the inner tube.