Motorcycle Height Adjustment Back Pressure Chamber
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Solution Overview
Problem
The existing vehicle-height adjustment apparatus for motorcycles experiences fluctuations in damping force characteristics due to changes in oil amount and pressure, which affect the compression ratio and inner pressure of the damper, and requires high sealing performance to manage high pressures, complicating the design and functionality.
Innovation Solution
Incorporating a back pressure chamber within the hydraulic jack, communicated with the hydraulic chamber, to stabilize damping force characteristics, reduce the influence of charged gas pressure, and lower the sealing performance requirements by establishing a pressure relationship that allows the plunger to seal effectively against atmospheric pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hydraulic jack operates to adjust vehicle height, then the vehicle height can be adjusted, but the amount of oil inside the damper changes which results in a change in the compression ratio and the inner pressure of the damper and influences the damping force characteristics
Solution Approach 1:
The patent extracts the oil reservoir chamber from the damper structure and positions it separately, allowing the hydraulic jack to operate independently without removing oil from the damper. This separation ensures that the damping force characteristics remain stable while still enabling vehicle height adjustment through the hydraulic jack's independent oil reservoir.
2Power
If the charged gas pressure of the oil reservoir chamber acts on the jack chamber during compression stroke, then the hydraulic system operates, but this pressure becomes a load that protrudes the plunger and limits the initial load of the suspension spring
Solution Approach 1:
The patent segments the hydraulic jack into two independent chambers: the jack chamber that receives pressurized oil from the damper, and the oil reservoir chamber that stores additional oil. The plunger separates these chambers, allowing the charged gas pressure to act only on the jack chamber without directly loading the suspension spring, thus enabling independent optimization of both hydraulic power and spring initial load.
3Ease of operation
If the side opposite to the jack chamber via the plunger is opened to the air, then the hydraulic jack can operate, but the sealing part of the plunger requires high sealing performance to seal the high pressure of the jack chamber relative to atmospheric pressure
Solution Approach 1:
The patent introduces a back pressure chamber as an intermediary between the jack chamber and the atmospheric environment. This back pressure chamber receives oil from the rod-side hydraulic chamber and provides a controlled pressure environment that reduces the pressure differential across the plunger sealing part, thereby lowering the sealing performance requirements while maintaining hydraulic jack operation.
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 stabilizes damping force characteristics, eliminates the influence of charged gas pressure on the initial load of the suspension spring, and reduces the sealing performance demands on the hydraulic jack, enhancing the overall functionality and reliability of the vehicle-height adjustment system.
Implementation Method 1
a hydraulic pump that is caused to perform a pumping operation by extension and compression movements of the piston rod relative to the damper tube and supplies and drains oil of the hydraulic chamber inside the damper tube to and from the jack chamber of the hydraulic jack
Implementation Method 2
a suspension spring interposed between a spring bearing provided on the other one of the damper tube and the piston rod and a spring bearing supported by the plunger
Implementation Method 3
a damper in which a piston rod slides in a hydraulic chamber inside a damper tube
Data Source
AI summary
In a vehicle-height adjustment apparatus of a motorcycle having the hydraulic jack attached to the damper, damping force characteristics of a damper are stabilized, the influence of the charged gas pressure of an oil reservoir chamber is eliminated, and the sealing performance of a hydraulic jack is reduced. In the vehicle-height adjustment apparatus of a motorcycle, a back pressure chamber is provided on a side opposite to a jack chamber, with a plunger being interposed therebetween inside a hydraulic jack, and this back pressure chamber is communicated with a hydraulic chamber inside a damper tube.