Dual-Passage Hydraulic Damper Layout for Compact Damping Control
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Solution Overview
Problem
Current dampers face challenges in miniaturization, requiring a design that can reduce size while maintaining effective damping performance.
Innovation Solution
A dual-tube type hydraulic damper design featuring a piston that partitions the cylinder into two chambers, with a first passage for fluid flow, a second passage in parallel, and damping force generation mechanisms in both passages, including an annular disc that can be bent by fluid pressure to control fluid flow and generate damping forces, allowing for miniaturization and weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional damper structures are used, then damping performance is maintained, but miniaturization is difficult
Solution Approach 1:
The patent places the second passage inside the case member, which penetrates the shaft-shaped member. This nested arrangement allows multiple functional passages to coexist in a compact configuration, enabling miniaturization of the overall damper structure while maintaining both damping functions.
Solution Approach 2:
The annular disc penetrates the shaft-shaped member and is disposed to face the bottom part of the case member, creating a three-dimensional spatial arrangement that efficiently utilizes available space. This dimensional optimization allows compact packaging of multiple damping mechanisms without compromising performance.
2Volume of moving object
If damper size is reduced, then miniaturization is achieved, but structural complexity increases
Solution Approach 1:
The patent combines multiple passages (first passage, second passage, bypass passage) and damping mechanisms into a single integrated damper structure. The case member serves as both a structural component and a housing for the second passage, while the annular disc integrates multiple functions including flow control and structural support.
Solution Approach 2:
The annular disc serves multiple functions: it partitions the inside of the case member into first and second chambers, provides structural support, and works with the bypass passage to enable the second damping force generation mechanism. This multi-functionality reduces the number of separate components needed.
3Reliability
If multiple passages are added for dual damping, then damping performance improves, but device size increases
Solution Approach 1:
The second passage is positioned inside the case member, creating a nested configuration where multiple functional passages occupy overlapping spatial volumes. This allows the damper to provide dual damping forces through separate passages without proportionally increasing the overall device size.
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 design achieves miniaturization and weight reduction while maintaining effective damping performance, improving ride comfort by varying damping forces based on piston frequency and speed.
Implementation Method 1
a first passage in which a working fluid flows out from one cylinder chamber due to movement of a piston
Implementation Method 2
a first damping force generation mechanism provided in the first passage to generate a damping force
Implementation Method 3
an annular disc which penetrates the shaft-shaped member and is disposed to face a bottom part of the case member in the case member to be able to be bent by the working fluid in the case member
Implementation Method 4
a second damping force generation mechanism provided in the bypass passage and configured to open a valve thereof when a pressure inside the first chamber reaches a predetermined pressure to generate a damping force
Data Source
AI summary
A damper includes a first passage and a second passage in parallel, a first damping force generation mechanism of the first passage, a case member in which a portion of the second passage is formed, an annular disc disposed to face a bottom part in the case member to be able to be bent by a working fluid in the case member, a first chamber communicating with a first cylinder chamber and a second chamber communicating with a second cylinder chamber which are provided by the disc partitioning the inside of the case member, a first through hole provided in the bottom part of the case member to communicate with the second chamber, a bypass passage provided in parallel to the first through hole and configured to allow communication between the first chamber and the second cylinder chamber, and a second damping force generation mechanism provided in the bypass passage.