Shock Absorber Stopper Nesting for Compact Length
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Solution Overview
Problem
Conventional shock absorbers with stoppers installed to prevent piston collision during full rebound require additional length due to the formation of a bypass passage, leading to increased overall length due to the width or diameter of the inlet port of the bypass passage.
Innovation Solution
A shock absorber design where a stopper is positioned at the outer periphery of the piston rod to cover the inlet port of the bypass passage, with an outer passage extending from the stopper to the inlet port, allowing reliable bypass function without increasing the basic length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stopper is installed to prevent piston collision during full rebound, then shock absorption reliability is improved, but the overall length of the shock absorber increases due to the bypass passage inlet port
Solution Approach 1:
The stopper is nested within the piston rod structure, with the stopper body positioned inside the piston rod and the stopper rubber extending outward. The bypass passage inlet port is formed within the piston rod wall, and the stopper is arranged to not interfere with this inlet port, allowing the stopper functionality to be integrated without adding external length to the shock absorber assembly.
Solution Approach 2:
The stopper is designed with a multi-dimensional structure where the stopper body is positioned axially within the piston rod, and the stopper rubber extends radially outward to provide the stopping function. This spatial arrangement allows the stopper to perform its collision-prevention function while maintaining compact overall dimensions, as the stopping action occurs in the radial direction rather than requiring additional axial length.
2Length of moving object
If the stopper is positioned to cover the inlet port of the bypass passage, then the basic length is maintained, but the bypass passage function may be compromised
Solution Approach 1:
The stopper is designed with differentiated local functions: the stopper body portion is positioned to cover the inlet port area to maintain compact length, while the stopper rubber extends outward to provide the collision-absorbing function. The outer passage is formed between the stopper and piston rod, creating a localized flow path that ensures bypass passage functionality is maintained despite the stopper's position covering the inlet port.
Solution Approach 2:
The outer passage acts as an intermediary flow path between the bypass passage inlet port and the working fluid flow. When the stopper covers the inlet port, the outer passage provides an alternative route for fluid flow, ensuring that the bypass function is maintained through this intermediate channel rather than being completely blocked by the stopper position.
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 allows the shock absorber to maintain functionality while preventing unnecessary length increase, ensuring efficient shock absorption and damping without compromising the piston rod's operation.
Implementation Method 1
an annular stopper rubber having an inner peripheral groove defining a gap between the piston rod and the stopper rubber
Implementation Method 2
a wall portion formed upright on the lower bottom portion, such that the wall portion is spaced apart from the outer periphery of the piston rod
Data Source
AI summary
A shock absorber is provided. The shock absorber includes: a piston rod; an inner passage having an inlet port at an outer periphery of the piston rod; and a stopper installed at the outer periphery of the piston rod. The stopper is disposed to surround the inlet port of the inner passage, and an outer passage extending from an upper portion of the stopper to the inlet port is formed between the stopper and the piston rod.