Hydraulic Accumulator Limit Stops for Servo Gearbox Integrity
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Solution Overview
Problem
Hydraulic servo-controls in gearboxes are prone to damage and leakage due to traumatic events, leading to depression and potential failure of the entire system, especially when large damages occur downstream of the hydraulic accumulator, causing the partition means to be dislodged from its seat.
Innovation Solution
The hydraulic servo-control system incorporates a hydraulic accumulator with a metal cup-shaped outer housing, a sliding piston, and limit stop means such as a circlip or perforated plate to maintain pressure within a safe range, preventing piston travel and potential damage during leaks, and utilizing an electronic control unit to manage fluid pressure without direct sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a hydraulic accumulator with a simple cup-shaped housing and sliding piston is used, then the device complexity and manufacturing cost are reduced, but the reliability deteriorates because traumatic damage can dislodge the partition means and cause system failure
Solution Approach 1:
The patent applies preliminary anti-action by providing limit stop means (such as annular grooves with retaining rings or counter-sunk holes with threaded plugs) that prevent the partition means from being dislodged before traumatic damage can occur. These limit stops are pre-installed in the accumulator housing to counteract the potential harmful effect of pressure surges that could otherwise eject the partition means and cause system failure.
Solution Approach 2:
The patent implements beforehand cushioning by designing the limit stop means to absorb and dissipate the energy of pressure surges before they can cause damage. The limit stops act as pre-positioned protective elements that cushion the partition means against excessive movement, preventing traumatic ejection and protecting the overall hydraulic system from catastrophic failure.
2Reliability
If limit stop means are added to prevent partition dislodgement, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by implementing limit stop means at specific critical locations within the accumulator housing rather than redesigning the entire structure. The limit stops are locally positioned to provide maximum protection with minimal added complexity, such as annular grooves with retaining rings at the housing ends or counter-sunk holes with threaded plugs at strategic positions.
Solution Approach 2:
The patent employs inexpensive limit stop components such as retaining rings, threaded plugs, or simple mechanical stops that can be easily manufactured and installed. These relatively simple, low-cost elements provide effective protection against traumatic damage without requiring complex engineering solutions, maintaining cost-effectiveness while improving reliability.
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 ensures the hydraulic servo-control system operates reliably and cost-effectively by maintaining pressure within a safe range, preventing damage from leaks and ensuring the system's integrity even in the event of traumatic damage, while being simple and inexpensive to implement.
Implementation Method 1
a hydraulic accumulator (3) containing control fluid under pressure
Implementation Method 2
a second variable-volume chamber adapted to receive a gas under pressure (typically N2)
Implementation Method 3
limit stop means (21) such as a circlip or perforated plate to maintain pressure within a safe range, preventing piston travel
Implementation Method 4
a motor pump (4) which draws the control fluid from the storing tank (2) and feeds the control fluid under pressure to the hydraulic accumulator (3)
Data Source
Figure 1
Figure 2~4
Figure 3
AI summary
A hydraulic servo-control (1) of a servo-controlled gearbox provided with a hydraulic accumulator (3), which is in turn provided with an outer housing (7) and a piston (12) provided so as to be axially sliding inside the outer housing (7) and adapted to define a first variable-volume chamber (C1) for a gaseous material and a second variable-volume chamber (C2) for a control fluid under pressure; and limit stop means (21) arranged at an open end of the outer housing (7) which serve as a lower limit stop element; wherein the outer housing (7) is provided with an upper limit stop element (20*), which is provided so as to limit the pressure value inside the first variable-volume chamber (C1) within a predetermined safety range.