Hydraulic Shock Absorber Gas Chamber Motor Load
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Solution Overview
Problem
Hydraulic shock absorbers in vehicles face a significant load on the drive unit due to mechanical losses like friction, which complicates the structure and increases size and cost, especially when adjusting vehicle height.
Innovation Solution
Incorporating a gas chamber filled with pressurized gas to assist the driving force for adjusting hydraulic pressure, reducing the load on the screw shaft and drive unit, and allowing for a simpler configuration that decreases the size and power consumption of the drive unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motor-driven screw shaft is used to adjust vehicle height, then the suspension spring can be adjusted in expansion and contraction directions, but a huge load is applied to the motor due to continuous gravitational potential energy
Solution Approach 1:
The patent introduces a gas chamber filled with pressurized gas that acts as a counterweight to balance the gravitational force on the suspension spring. The gas pressure opposes the gravitational potential energy, reducing the net load on the motor during height adjustment operations.
Solution Approach 2:
The patent employs a gas chamber with pressurized gas to provide mechanical assistance. The pneumatic system counterbalances the gravitational load on the suspension spring, enabling the motor to operate with reduced force requirements during vehicle height adjustment.
2Stability of the object's composition
If the screw shaft is screwed into the pump piston to maintain vehicle height, then height stability is achieved, but mechanical loss such as friction applies continuous load to the motor
Solution Approach 1:
The gas chamber provides a counterbalancing force that offsets gravitational effects, reducing the frictional losses in the screw shaft-pump piston interface. This minimizes continuous energy consumption while maintaining height stability.
Solution Approach 2:
The gas pressure system automatically compensates for gravitational forces and frictional losses, enabling the system to maintain vehicle height with minimal motor intervention and reduced continuous energy input.
3Volume of moving object
If the size of the motor is decreased to reduce hydraulic shock absorber size, then the overall device becomes more compact, but the load on the motor must be reduced
Solution Approach 1:
The pressurized gas chamber serves as a counterweight mechanism that reduces the effective load on the motor. This enables the use of a smaller motor while maintaining the capability to adjust the suspension spring against gravitational forces.
Solution Approach 2:
The pneumatic assistance from the gas chamber reduces the force requirements on the motor, enabling size reduction of the motor while preserving the functional capability to adjust vehicle height against gravity.
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 solution reduces mechanical losses, decreases the size of the drive unit, and enables quicker adjustment of vehicle height while maintaining a cost-effective and simplified design.
Implementation Method 1
a gas chamber filled with a pressurized gas; a driving force for adjusting a hydraulic pressure by a drive unit can be assisted by a biasing force of a gas pressure
Implementation Method 2
a jack chamber holding the plunger such that the plunger is capable of being advanced and retracted, is the jack chamber being filled with oil capable of pushing the plunger in an advancing direction
Implementation Method 3
a screw shaft disposed in the gas chamber and screwed into the pump piston; a drive unit rotating the screw shaft
Implementation Method 4
a suspension spring biasing the damper tube and the piston rod in opposite directions
Data Source
AI summary
A hydraulic shock absorber includes a piston, a damper tube, a suspension spring, a plunger, a jack chamber, a pump case, a pump piston, a screw shaft, and a drive unit. Both end surfaces of the pump piston in a reciprocating direction are a first end surface demarcating the pump chamber, and a second end surface demarcating the gas chamber, the second end surface having a screw hole into which the screw shaft is screwed. The pump piston includes a space portion between a bottom plate defining the first end surface and the screw hole. The screw shaft has a through-hole connecting the gas chamber with the space portion.