Hydraulic Shock Absorber Gas Pressure Control
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Solution Overview
Problem
Conventional hydraulic shock absorbers face challenges in achieving desired elastic deformation of the rubber mount due to limitations in piston rod diameter and construction, leading to unsuitable damping characteristics and reduced riding comfort when transitioning from single-rod to double-rod types.
Innovation Solution
A hydraulic shock absorber design that includes a sealed space with gas pressure adjustable by an injection valve, allowing for fine tuning of the urging force by varying the gas pressure within the sealed space, enabling the shock absorber to adapt to various rubber mount characteristics and maintain optimal damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the piston rod diameter is increased to improve strength and capacity, then the urging force increases, but it becomes difficult to obtain desired rubber mount characteristics and achieve desired elastic deformation
Solution Approach 1:
The patent introduces a gas chamber with adjustable gas pressure as a new parameter to control the urging force. By changing the gas pressure parameter, the urging force can be adjusted independently of the piston rod diameter, allowing optimization of both strength and rubber mount characteristics
Solution Approach 2:
The gas chamber acts as an intermediary between the hydraulic system and the rubber mount. The gas pressure provides a controllable urging force that mediates the interaction between the piston rod and rubber mount, enabling fine-tuning of the elastic deformation characteristics
2Device complexity
If the shock absorber is changed from single-rod to double-rod type, then the structural limitations are overcome, but the rubber mount characteristics become unsuitable and damping characteristics deteriorate
Solution Approach 1:
The patent adjusts the gas pressure parameter in the sealed space to control the urging force, enabling the shock absorber to maintain desired elastic deformation characteristics regardless of whether it is single-rod or double-rod type, thus preserving damping characteristics
3Force
If the gas pressure in the sealed space is increased, then the urging force increases, but the rubber mount elastic deformation becomes excessive
Solution Approach 1:
The system allows adjustment of gas pressure based on the observed elastic deformation of the rubber mount. By monitoring the deformation and adjusting the gas pressure accordingly, the urging force can be optimized to achieve desired elastic deformation without being excessive
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 adjustable gas pressure system allows for precise control of the urging force, enhancing the shock absorber's adaptability and maintaining desired elastic deformation, thereby improving damping characteristics and riding comfort across different rubber mount types.
Implementation Method 1
a sealed space for containing an extension end of the sub piston rod is provided, and gas having a pressure larger than atmospheric pressure and smaller than a pressure applied on the hydraulic oil by the oil chamber pressurizing device is filled in the sealed space
Implementation Method 2
a damping force generator for generating a damping force with the hydraulic oil flowing between the first and second oil chambers
Implementation Method 3
the vehicle body side weight (W) corresponding to the shock absorber is supported on the wheel side by the spring reaction force (F) of the suspension spring and is also supported on the wheel side by the urging force (R) of the oil chamber pressurizing device via the piston, the piston rod, and the rubber mount on the shock absorber
Data Source
AI summary
A shock absorber includes a cylinder tube connected to one portion of a shock absorbing body, a main piston rod extending from a piston with its extension end being connected to another portion of the shock absorbing body, a sub piston rod extending from the piston, an oil chamber pressurizing device arranged to pressurize a hydraulic oil, and damping force generators arranged to generate a damping force by allowing the hydraulic oil to flow between first and second oil chambers. A sealed space for containing an extension end of the sub piston rod is provided. Gas having a pressure larger than atmospheric pressure and smaller than a pressure applied on the hydraulic oil by the oil chamber pressurizing device is filled in the sealed space.