Brake Chamber Volume Switching to Cut Wet Brake Drag
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Solution Overview
Problem
Conventional brake devices face issues with mechanical efficiency due to increased oil agitation resistance and heat generation in wet brakes, and shorter service life and maintenance challenges in dry brakes, necessitating a solution to reduce liquid agitation resistance and heat while maintaining machine efficiency and maintainability.
Innovation Solution
A brake device that switches between a wet braking state, where the brake chamber is filled with liquid, and a dry braking state, where it is evacuated, using a volume changing mechanism to adjust the brake chamber's volume and eliminate liquid-induced resistance and heat during the braking released state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the brake mechanism is arranged in oil (wet brake), then the cooling capacity is improved, but the mechanical efficiency deteriorates due to increased oil agitation resistance and shear resistance
Solution Approach 1:
The brake device dynamically changes the volume of the brake chamber based on the braking state. In the braking applied state, the chamber is filled with liquid for cooling. In the braking released state, the chamber volume is reduced to evacuate the liquid, eliminating agitation resistance and improving mechanical efficiency. This dynamic volume adjustment allows the system to adapt to different operational requirements.
2Temperature
If the brake mechanism operates in liquid (wet brake), then the heat dissipation is improved, but the heat generation increases due to additional friction and agitation
Solution Approach 1:
The system dynamically adjusts the brake chamber volume to match the thermal requirements. During braking when heat is generated, the chamber is filled with liquid to provide cooling. During non-braking when no heat is generated, the chamber volume is reduced to evacuate the liquid, eliminating the source of additional heat from liquid agitation and shear resistance.
3Loss of energy
If the brake chamber volume is changed to switch between wet and dry operation, then the machine efficiency is improved, but the device complexity increases due to the volume changing mechanism
Solution Approach 1:
The volume changing mechanism is integrated with the existing brake mechanism and hydraulic system. The same hydraulic pressure that controls the brake piston also controls the volume changing mechanism, merging multiple functions into a unified system. This reduces the need for separate control systems and minimizes the overall complexity increase.
Solution Approach 2:
The hydraulic system serves multiple functions: it provides braking force through the brake piston, controls the volume changing mechanism to adjust chamber volume, and evacuates or fills the brake chamber with liquid. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity.
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 configuration reduces resistance and heat generation, enhancing machine efficiency without compromising maintainability by allowing the brake device to operate as a dry brake when not braking, thus improving overall performance and longevity.
Implementation Method 1
When the pressure in the pressure chamber is lower than a predetermined level, the brake spring presses the brake piston... When the pressure in the pressure chamber increases above a predetermined level, the brake piston moves against the pressing force applied by the brake spring
Implementation Method 2
the brake spring presses the brake piston, which causes friction between the rotatable and stationary friction plates
Implementation Method 3
the brake spring presses the brake piston, which causes friction between the rotatable and stationary friction plates
Data Source
AI summary
A brake device includes a brake mechanism including a shaft received in a brake chamber capable of being filled with a liquid, the brake mechanism being configured to switch between a braking applied state, in which the brake mechanism restricts a rotational motion of the shaft by generating a braking force, and a braking released state, in which the brake mechanism permits the rotational motion of the shaft by not generating the braking force. In the brake device, the brake chamber is filled with the liquid in the braking applied state, and the brake chamber is evacuated of the liquid in the braking released state.