Bellows Accumulator Pre-Charge Protection for Suspension Reliability
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Solution Overview
Problem
Bellows accumulators in vehicle suspension systems are prone to damage during pre-charging and operation due to pressure differentials, leading to deformation and reduced fatigue life, which affects the structural integrity and performance of the suspension system.
Innovation Solution
A bellows accumulator design with an annular bellows wall and a movable plate, where a valve is used to control fluid communication between the accumulation chamber and the gas chamber, allowing for pre-filling with fluid before pressurized gas is introduced, and maintaining fluid between the bellows and outer shell to manage pressure differentials and protect the bellows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bellows accumulator is pre-charged with pressurized gas before installation, then the accumulator is ready for immediate operation, but the bellows may be damaged due to overpressure conditions and deformation
Solution Approach 1:
The bellows accumulator is pre-assembled with the bellows installed in the housing before vehicle installation, but the pressurized gas charging is delayed until after installation. This preliminary preparation allows the accumulator to be ready for operation while avoiding premature pressurization that could damage the bellows
Solution Approach 2:
The design prevents the harmful effect of overpressure damage by controlling the sequence of operations - the bellows is protected from excessive pressure during assembly and shipping by ensuring gas charging occurs only after proper installation, thereby preemptively avoiding the damage mechanism
2Reliability
If the bellows accumulator is assembled and shipped without pressurized gas, then bellows damage risk is reduced, but additional charging operations are required at the vehicle build site
Solution Approach 1:
The bellows accumulator is pre-assembled with all components including the bellows, housing, and sealing elements installed before shipping. This preliminary assembly eliminates the need for complex on-site assembly operations, reducing the time and complexity of charging operations at the vehicle build site
3Adaptability or versatility
If the bellows extends and retracts during operation, then the accumulator can supply and receive damping fluid, but the bellows may be damaged when pressure differential is significant
Solution Approach 1:
The bellows is designed as a flexible element that can extend and retract to accommodate fluid volume changes while maintaining structural integrity. The flexible nature allows it to withstand pressure differentials during operation without permanent deformation, enabling repeated charge/discharge cycles
Solution Approach 2:
The bellows is pre-formed with corrugations or pleats that provide structural reinforcement and flexibility. This pre-formed structure cushions the bellows against damage during normal operation by distributing stress during extension and retraction cycles, thereby extending fatigue life
4Ease of manufacture
If the bellows is pre-assembled in the housing, then installation is simplified, but damage may occur during handling and installation if overpressure conditions exist
Solution Approach 1:
The bellows accumulator is pre-assembled with the bellows installed in the housing before vehicle installation, simplifying the installation process. The assembly is performed under controlled conditions where pressure differentials are minimized, and the unit is handled in a discharged or low-pressure state to avoid damage during handling and installation
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 design enhances the robustness of the bellows accumulator by preventing deformation and maintaining structural integrity over the life of the suspension system, ensuring improved performance and reliability.
Implementation Method 1
The pressurized gas provides a positive pressure inside the bellows that will force dampening fluid out of the accumulator when fluid pressure in the accumulation chamber is less than the gas pressure inside the pressurized gas chamber
Implementation Method 2
The bellows may extend and retract within a housing based on the pressure of the fluid in the system in which the pressurized gas chamber acts
Data Source
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AI summary
A bellows accumulator for a vehicle suspension system and related methods of operating the accumulator include inserting a bellows assembly within an outer shell. The bellows assembly includes an annular bellows wall defining a gas chamber of variable volume. An accumulation chamber is provided between the outer shell and the bellows assembly. The method includes operating a valve in fluid communication with the accumulation chamber in an open condition and a closed condition, filling the accumulation chamber with fluid prior to filling the gas chamber with pressurized gas, providing a pressure differential between the pressurized gas chamber and the accumulation chamber to extend the annular bellows wall and operate the valve in the closed condition. The method includes protecting the bellows wall during pre-charging of the pressurized gas chamber as well as during vehicle suspension operation by maintaining fluid between the outer shell and the annular bellows wall.