Hydrostopper Shock Absorber With Variable Orifice Damping
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Solution Overview
Problem
Conventional shock absorbers with hydrostoppers face challenges in effectively decelerating the piston at high relative velocities while minimizing the risk of shocks due to rapid increases in damping force, and they either fail to decelerate adequately at low velocities or cause rebound stopper hits and noise due to inadequate damping.
Innovation Solution
Incorporating an elastically deformable member that reduces the effective passage cross-sectional area of the orifice passage by elastic deformation, increasing the reduction amount as differential pressure between stopper chambers increases, allowing for adaptive damping force generation based on relative velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the effective passage cross-sectional area of the orifice is set small, then damping force becomes high and relative displacement of the piston can be effectively limited, but damping force is high even at low relative velocity causing rapid deceleration and shock to occupants
Solution Approach 1:
The patent applies the dynamics principle by making the orifice passage cross-sectional area variable rather than fixed. The elastically deformable member changes the effective passage area dynamically in response to differential pressure, which varies with piston velocity. At low velocities, the passage area remains larger to limit damping force and prevent shock. At high velocities, the passage area reduces to increase damping force for effective deceleration.
Solution Approach 2:
The patent implements parameter changes by modifying the effective passage cross-sectional area of the orifice based on operating conditions. The elastically deformable member alters the geometric parameter (passage area) in response to pressure differential, which itself changes with piston velocity. This creates a velocity-dependent damping force characteristic that resolves the contradiction between limiting displacement and preventing shock.
2Object-affected harmful factors
If the effective passage cross-sectional area of the orifice is set large, then damping force is low allowing smooth operation, but insufficient damping force fails to decelerate the piston effectively at high relative velocity causing rebound stopper hits and noise
Solution Approach 1:
The dynamics principle is applied by enabling the orifice passage area to adapt dynamically to piston velocity through the elastically deformable member. At high velocities, the increased differential pressure causes greater elastic deformation, reducing the passage area and thereby increasing damping force to prevent rebound stopper hits and noise while maintaining smooth operation at lower velocities.
3Adaptability or versatility
If a fixed orifice with constant effective passage cross-sectional area is used, then the structure is simple, but it cannot adapt to varying relative velocities of the piston
Solution Approach 1:
The patent applies the self-service principle by designing a system where the elastically deformable member automatically adjusts the orifice passage area in response to differential pressure generated during piston movement. The system self-regulates the damping force based on velocity conditions without requiring external control mechanisms, maintaining structural simplicity while achieving adaptability to varying velocities.
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 decelerates the piston at high velocities while reducing the likelihood of shocks and rebound stopper hits by adjusting damping force generation in response to relative velocity, ensuring smoother operation and reduced noise.
Implementation Method 1
an elastically deformable member that reduces an effective passage cross-sectional area of the orifice passage by elastic deformation
Implementation Method 2
a biasing member for biasing the stopper piston against the engagement member
Implementation Method 3
oil in the stopper chamber having a higher pressure flows through the orifice passage to the stopper chamber having a lower pressure, whereby a damping force against the relative displacement of the piston
Data Source
AI summary
A shock absorber with a hydrostopper is provided. The hydrostopper includes a stopper piston that is relatively displaceable along a rod portion of a piston and partitions one cylinder chamber into an upper chamber and a lower chamber, and a compression coil spring that biases the stopper piston against a stopper disc fixed to the rod portion in the lower chamber. The stopper piston has an orifice passage connecting the upper and lower chambers. The hydrostopper includes an elastic disk functioning as an elastically deformable member that increases an amount of elastic deformation to increase an amount of reduction of an effective passage cross-sectional area of the orifice passage as a differential pressure between pressures in the upper and lower chambers is larger when the pressure in the upper chamber is higher than the pressure in the lower chamber.