Power Brake Valve Pressure Split for Front-Rear Brake Torque
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Solution Overview
Problem
Existing power brake valves for work vehicles, such as agricultural tractors, face challenges in providing optimized and economic different pressure values to front and rear wheels, as the smaller front wheel brakes require increased fluid pressure to achieve 40-50% of the total brake torque without dimension increases, necessitating a hydraulic solution that efficiently manages brake fluid pressure across both axles.
Innovation Solution
A power brake valve configured with spools and pressure variation means to allow different fluid pressure levels to be delivered to front and rear brakes from a common source, using accumulators and pressure reduction valves to adjust pressure between 10% to 100% of the initial pressure, enabling independent control of each wheel and optimizing brake distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If front brake dimensions are increased to provide higher braking torque, then braking capability is improved, but wheel hub diameter constraints prevent dimension increases
Solution Approach 1:
The patent changes the pressure parameter of the braking fluid to compensate for the limited brake dimension. By providing a dedicated high-pressure fluid source for front brakes, the system achieves higher braking torque from smaller brakes through increased fluid pressure rather than increased physical size.
2Device complexity
If a single power brake valve controls both rear and front brakes, then device complexity is reduced, but the ability to provide optimized different pressure values to front and rear wheels is compromised
Solution Approach 1:
The patent segments the brake control system by providing separate power brake valves for front and rear brakes. This allows independent pressure control for each brake circuit, enabling optimized pressure values to be delivered to front and rear wheels separately while maintaining adequate braking performance.
3Adaptability or versatility
If additional relay valves are added to provide different pressure levels to front and rear brakes, then pressure control capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes each power brake valve universal by designing it to deliver multiple pressure levels to its respective brake circuit. The power brake valve can provide both normal service braking pressure and higher emergency braking pressure, eliminating the need for separate relay valves while maintaining full pressure control capability.
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 allows for efficient and optimized fluid pressure management across all wheels, enabling reduced brake dimension usage, independent wheel control, and reduced hydraulic arrangement complexity, eliminating the need for additional relay valves while providing emergency braking capabilities.
Implementation Method 1
power brake valve fluidly interposed between a common source of fluid in pressure and front and rear brakes, power brake valve is configured to receive the fluid at a predefined pressure level from said source and to allow the passage of such fluid at a least one different pressure level with respect to the predefined pressure level of said source
Implementation Method 2
pressure variation means configured to vary the pressure of the fluid passing through them between an inlet and an outlet of these latter
Data Source
Figure 1
Figure 1A
Figure 2
AI summary
Power brake valve (5) for a hydraulic braking arrangement (1) of a work vehicle, the hydraulic braking arrangement (1) comprising a source of fluid (4) in pressure and a pair, right and left, of front and rear brakes (2a, 3a, 2b, 3b), the power brake valve (5) being configured to receive fluid from source (4) at a predefined pressure level and allow the passage of such fluid at a least one different pressure level with respect to the predefined pressure level to at least one of said brakes (2a, 3a, 2b, 3b).