Dual-Purpose Hydraulic Brake Valve for Manual Power Failure Deactivation
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Solution Overview
Problem
In large vehicles, existing spring-activated hydraulic release braking systems require additional control components for manual deactivation of the parking brake during power failures, complicating construction and operation.
Innovation Solution
A dual-purpose valve that integrates a two-position hydraulic brake control valve with a moveable valve member, allowing for both brake activation and deactivation by altering the valve's state, eliminating the need for separate control elements by enabling pressurized fluid flow between the brake cylinder and fluid tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a manually operable pump is provided for creating hydraulic pressure in a brake cylinder during power failure, then brake deactivation is enabled, but additional control components are required
Solution Approach 1:
The patent combines the manual pump and control valve into a single integrated assembly. The manual pump includes a piston that directly actuates a spool valve within the same housing, eliminating the need for separate control components. The pump chamber and control chamber share a common structure, with the piston serving dual functions of pressurizing fluid and controlling valve position.
Solution Approach 2:
The manual pump assembly serves multiple functions: it acts as both a fluid pressurization device and a control valve mechanism. The spool valve within the assembly controls fluid flow during both normal operation and power failure conditions, making the single component universally functional across different operational states without requiring additional specialized parts.
2Adaptability or versatility
If additional control components are added for manual brake deactivation, then power failure brake deactivation is enabled, but construction complexity increases
Solution Approach 1:
The patent merges the manual pump and control valve into a single integrated assembly with shared housing and common fluid passages. The spool valve is positioned within the pump housing, and both components utilize the same mechanical actuation mechanism, reducing the total number of parts and simplifying manufacturing assembly procedures.
Solution Approach 2:
The spool valve is nested within the manual pump housing, with the control chamber positioned inside or adjacent to the pump chamber. This nested arrangement allows the control valve to be housed within the existing pump structure, eliminating the need for separate valve housing and reducing overall component count and assembly complexity.
3Ease of operation
If separate control elements are used for brake activation and deactivation, then precise control is achieved, but operational complexity increases
Solution Approach 1:
The patent combines brake activation and deactivation control into a single manual pump assembly. The spool valve within the assembly has positioned lands that control fluid flow to either apply or release the brake based on the pump piston position, eliminating the need for separate control elements while maintaining precise control through the integrated mechanism.
Solution Approach 2:
The manual pump assembly serves as a universal control device that handles both brake activation and deactivation functions. By positioning the spool valve lands appropriately, the same mechanical input (pump piston movement) controls both braking and release operations, simplifying the control interface while maintaining functional precision.
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
Simplifies the braking system by allowing manual deactivation of the parking brake during power failures without additional control components, enhancing operational ease and safety.
Implementation Method 1
it is known to provide a pump that is manually operable for the purpose of creating sufficient hydraulic pressure in a brake cylinder as to cause release of a parking brake
Implementation Method 2
typically such an arrangement operates on the basis of the brake shoe or pad of the parking brake being spring biased towards a brake-on position
Data Source
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AI summary
A dual-purpose valve (20) for a braking system (10'), comprises: a two-position hydraulic brake control valve (46) coupled to a moveable valve member (34), a brake control chamber (76) for holding fluid; a brake port (73) for connecting to a brake cylinder (17); and a tank port (74). Movement of the moveable valve member (34; 44) in a first direction towards a brake deactivation position maintains the hydraulic brake control valve (46) in a closed state, and causes pressurised fluid flow from the brake control chamber (76) to the brake port (73) disengaging the braking system (10'). Movement of the moveable valve member (34; 44) in a second direction towards a brake activation position alters the hydraulic brake control valve (46) from a closed state to an open state, and permits pressurised fluid flow from the brake port (73) to the tank port (74) through the dual-purpose valve (20).