Shock Absorber Partition Piston Structure 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 with damping forces that increase 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 the shock absorber, then the damping force can be increased when the piston rod reaches a predetermined range, but the device complexity and manufacturing cost increase
Solution Approach 1:
The partition piston is integrated into the first cylinder to form an integrated assembly that simplifies the overall structure. The partition piston and first cylinder work together as a unified damping force increasing mechanism, reducing the number of separate components and assembly steps while maintaining the functionality of increasing damping force in the predetermined range.
Solution Approach 2:
The first cylinder serves multiple functions: it acts as a structural component of the shock absorber body, contains the partition piston, and together they form the damping force increasing mechanism. This multi-functionality reduces the need for additional dedicated components, thereby simplifying the overall device structure.
2Force
If a damping force increasing mechanism with first cylinder and partition piston is implemented, then the damping force increases when piston assembly moves to second chamber side, but the manufacturing cost increases
Solution Approach 1:
The partition piston and first cylinder are designed as an integrated assembly that can be manufactured and assembled as a unit, reducing manufacturing complexity and cost. This merging approach eliminates the need for separate mounting structures and simplifies the production process.
Solution Approach 2:
The damping force increasing mechanism is activated only in the predetermined range when the piston rod reaches a specific position, rather than operating continuously throughout the entire stroke. This localized activation allows for a simpler design that only adds complexity where necessary, reducing overall manufacturing cost.
3Force
If the partition piston enters the first cylinder to form a partition chamber, then the damping force is increased, but the device complexity increases
Solution Approach 1:
The partition piston and first cylinder form an integrated assembly where the partition chamber is created by the interaction of these two components. This merging approach simplifies the mechanism by eliminating the need for separate chamber formation structures and reducing the number of moving parts.
Solution Approach 2:
The partition piston is nested within the first cylinder, with the partition chamber formed inside the first cylinder. This nested arrangement allows the damping force increasing mechanism to be compact and integrated within the existing shock absorber structure, minimizing additional 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 by optimizing damping force generation, thereby reducing overall costs without compromising performance.
Implementation Method 1
a piston assembly connected to an intermediate position of the piston rod in the axial direction, dividing the 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
Data Source
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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 the inside of the first cylinder to form a partition chamber in the first cylinder when the piston assembly moves to the second chamber side.