Hydraulic Brake Make-up Line Reduces Release Delay
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Solution Overview
Problem
Hydraulic brake systems with pressure-released brakes experience delays in releasing due to brake fluid loss through seal leaks, leading to insufficient oil volume and potential machine lurching during acceleration.
Innovation Solution
Incorporating a make-up line connected to the relief valve discharge line and a check valve allowing one-way flow to the individual brake line, which replenishes lost brake fluid, reducing the delay in releasing the brakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pressure-released brakes are used in hydraulic brake systems, then brake release is automatic when set pressure is present, but brake fluid is lost through seal leaks causing delayed brake release
Solution Approach 1:
The make-up line pre-establishes a fluid communication path from the relief valve discharge line to the brake line, so that when brake fluid is lost through seal leaks, the replacement fluid can immediately flow through the pre-positioned make-up line without requiring system pressure buildup, thereby eliminating the time delay in brake release
Solution Approach 2:
The make-up line acts as an intermediary fluid pathway that mediates between the relief valve discharge line and the brake line, providing a dedicated route for brake fluid replacement that bypasses the normal pressure-dependent fluid transfer mechanism
2Quantity of substance
If brake fluid is replenished through normal system pressure buildup, then brake line volume is restored, but machine lurching occurs during acceleration
Solution Approach 1:
The make-up line serves as an intermediary pathway that allows brake fluid to be replenished directly from the relief valve discharge line without requiring rapid pressure buildup in the main system, thereby avoiding the harmful effect of machine lurching while still restoring adequate brake fluid volume
Solution Approach 2:
The fluid replacement function is segmented from the main pressure buildup process by creating a separate make-up line pathway, allowing brake fluid volume restoration to occur independently of the pressure changes that cause machine lurching
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 significantly reduces the delay in brake release from 800-900 ms to approximately 200 ms, enhancing the performance and stability of hydraulic brake systems in work machines by maintaining adequate oil volume.
Implementation Method 1
a check valve on the make-up line allowing one-way flow from the relief valve discharge line to the individual brake line
Data Source
AI summary
A hydraulic brake system is disclosed which may include a supply pump pressurizing a brake control system via a brake control supply line; a pressure-released brake connected to the brake control system via a brake line; a pressure relief valve with an inlet connected to the brake control supply line and an outlet connected to a relief valve discharge line; a make-up line connecting the brake line and the relief valve discharge line; and a check valve on the make-up line allowing one-way flow from the relief valve discharge line to the brake line.