Shock Absorber Partition Piston Layout for Low-Cost Damping Boost
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Solution Overview
Problem
There is a demand to curb the increase in cost of shock absorbers, particularly those that enhance damping force when a piston rod reaches a predetermined range during a compression stroke.
Innovation Solution
A shock absorber design featuring a tube with an inner chamber divided by a piston assembly into first and second chambers, and a damping force increasing mechanism using a first cylinder and partition piston to enhance damping force when the piston assembly moves to the second chamber side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a damping force increasing mechanism is added to enhance damping force during compression stroke, then damping force performance is improved, but manufacturing cost increases
Solution Approach 1:
The partition piston is nested within the first cylinder, which itself is disposed inside the tube. This nested configuration allows the damping force increasing mechanism to be integrated within the existing shock absorber structure without requiring additional external components, thereby improving damping force while controlling manufacturing cost.
Solution Approach 2:
The piston assembly divides the inner chamber into first and second chambers, and the partition piston further segments the first chamber into first and second cylinder inner chambers. This segmentation enables independent control of damping force in different stroke ranges, achieving enhanced damping performance through functional division rather than adding a completely separate mechanism.
2Force
If a partition piston is used to form partition chambers to increase damping force, then damping force is enhanced, but device complexity increases
Solution Approach 1:
The partition piston serves multiple functions: it divides the first cylinder inner chamber into two separate chambers, acts as a movable barrier to control fluid flow, and provides structural support for the damping force increasing mechanism. This multi-functionality reduces the need for additional separate components, thereby enhancing damping force while limiting increases in structural complexity.
Solution Approach 2:
The first cylinder, partition piston, and piston assembly are merged into a single integrated structure where the partition piston is disposed within the first cylinder and both are connected to the piston rod. This merging consolidates multiple functions into fewer components, achieving enhanced damping force without proportionally increasing device complexity.
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 effectively curbs the increase in cost while maintaining or enhancing damping force performance.
Implementation Method 1
a damping force increasing mechanism increasing the damping force when the piston assembly moves to the second chamber side. The damping force increasing mechanism includes a first cylinder connected to the one end portion side of the piston rod with respect to the piston assembly, and a partition piston entering the inside of the first cylinder to form a partition chamber in the first cylinder
Data Source
AI summary
This shock absorber includes a tube, a piston rod having one end portion in an axial direction disposed in the tube and the other end portion in the axial direction disposed outside the tube, a piston assembly connected to an intermediate position of the piston rod in the axial direction, dividing an inner chamber into a first chamber on the other end portion side of the piston rod and a second chamber on the one end portion side of the piston rod, and configured to generate a damping force when the piston rod moves, and a damping force increasing mechanism increasing the damping force when the piston assembly moves to the second chamber side. The damping force increasing mechanism includes a first cylinder connected to the one end portion side of the piston rod with respect to the piston assembly, and a partition piston entering inside of the first cylinder.