Brake Valve Bleed Line With Check Bypass for Pressure Spike Damping
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Solution Overview
Problem
Hydraulic brake systems in work machines experience pressure spikes and noise due to unrestricted fluid flow, and voiding of the spring chamber when the brake pedal is released, which affects operator feedback and system performance.
Innovation Solution
A retarding control assembly with a bleed line featuring a check valve and a restricted bypass orifice is implemented between the spring chamber and the tank, allowing controlled fluid flow to prevent voiding and dampen pressure spikes, ensuring smooth operation and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If free flow of fluid into and out of the spring chamber is provided, then operator feedback is improved, but pressure spikes are experienced by the operator
Solution Approach 1:
A check valve is introduced as an intermediary component in the bleed line between the spring chamber and tank. The check valve allows fluid to flow freely from the spring chamber to the tank during brake release, preventing pressure spikes, while restricting reverse flow to maintain proper chamber pressure and operator feedback characteristics.
Solution Approach 2:
The flow characteristics of the bleed line are modified by introducing a check valve that dynamically changes the flow direction parameters. The valve allows unrestricted flow in one direction (chamber to tank) while restricting flow in the opposite direction, thereby controlling pressure dynamics without compromising operator feedback.
2Object-affected harmful factors
If fluid flow into the spring chamber is overly restricted or prevented, then pressure spikes are reduced, but a void in the chamber develops and noise is heard
Solution Approach 1:
The check valve acts as a selective mediator that permits fluid flow from the spring chamber to the tank during brake release, preventing void formation and associated noise, while simultaneously blocking reverse flow that would cause pressure spikes. This directional control resolves both harmful effects.
Solution Approach 2:
Instead of restricting flow in both directions or allowing free flow in both directions, the system inverts the approach by allowing free flow in one direction (outward) while restricting flow in the opposite direction (inward). This asymmetric flow control eliminates both pressure spikes and void formation.
3Object-affected harmful factors
If the spring chamber is allowed to void when the brake pedal is released, then pressure spikes are reduced, but operator feedback deteriorates
Solution Approach 1:
The check valve serves as a mediator that prevents fluid from entering the spring chamber from the tank during brake release, thereby preventing chamber voiding and maintaining proper operator feedback, while still allowing the chamber to discharge pressure to the tank to reduce pressure spikes.
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 solution effectively prevents voiding of the spring chamber and reduces pressure spikes, enhancing operator feedback and system stability by allowing controlled leakage flow, thereby improving the overall performance and feel of the brake pedal.
Implementation Method 1
The bleed line may include a check valve configured to allow fluid flow from the spring chamber to the tank
Implementation Method 2
The check valve bypass may be arranged in parallel with the check valve and may define a restricted pathway sized to damp pressure spikes and establish leakage flow to the spring chamber
Implementation Method 3
a bleed line configured for arrangement between a spring chamber of a brake command assembly and a tank line
Data Source
AI summary
A retarding control assembly for a brake valve may include a bleed line configured for arrangement between a spring chamber of a brake command assembly and a tank line. The bleed line may include a check valve configured to allow fluid flow from the spring chamber to the tank and a check valve bypass configured to allow fluid flow from the tank line to the spring chamber passed the check valve and defining a restricted pathway.