Spring-Loaded Brake Automatic Reconnection via Pressure Feedback
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Solution Overview
Problem
The risk of accidents increases when the brake release pressure fails in spring-loaded brakes used in mobile work machines, as the brake becomes permanently disabled, leading to uncontrolled movement of repaired machines on slopes due to the lack of an effective parking brake.
Innovation Solution
The spring-loaded brake is automatically reconnected to the brake-release pressure supply circuit when the brake-release pressure is restored, eliminating the need for manual resetting and ensuring operational safety by using a switching element that automatically resets from a secondary position to its primary position based on prevailing pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manually operable shut-off element is used to interrupt the flow connection between the brake and control valve during servicing, then the brake can be released by a separate pressure medium source, but the brake system becomes permanently disabled if the shut-off element is not reset after towing
Solution Approach 1:
The switching element automatically resets itself when brake release pressure is restored, eliminating the need for manual intervention. The system serves itself by using the restored pressure to trigger the automatic reconnection of the brake to the control valve, ensuring the parking brake is restored to functionality without human action.
Solution Approach 2:
The system incorporates feedback through the switching element that detects the restoration of brake release pressure and automatically responds by reestablishing the flow connection between the brake and control valve. This closed-loop feedback ensures the brake system is automatically restored to its normal operating state.
2Ease of operation
If the shut-off element is reset manually after towing, then the brake can be controlled again via the control valve, but it is not always visible whether the parking brake has been overridden
Solution Approach 1:
The patent employs visual indicators that change color or state to indicate whether the switching element is in the blocked or through position. This allows operators to easily detect the status of the parking brake system without needing to inspect the switching element directly, making the status visible and intuitive.
3Ease of repair
If the brake is released manually during servicing, then the brake can be aerated with pressure medium, but the connection between brake and control valve remains interrupted
Solution Approach 1:
The switching element is extracted as a separate, dedicated component that can be independently operated to interrupt or restore the flow connection. This separation allows the brake to be serviced independently while providing a clear mechanism for restoring normal operation, simplifying the overall system architecture.
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 risk of accidents by automatically reestablishing the brake system's original operating state upon restoration of brake release pressure, ensuring the brake is functional again without manual intervention.
Implementation Method 1
The switching element (30) can be reset automatically from its blocked position into its through position as a function of the pressure prevailing in the brake release pressure supply circuit (63)
Data Source
Figure 1
Figure 2~4
AI summary
The invention relates to a method for releasing at least one spring-loaded brake (10) that can be actuated by means of a hydraulic fluid, said brake being subjected to a brake-release pressure via a connection to a brake-release pressure supply circuit (63) during normal operation and for servicing purposes, when the brake-release pressure fails, is disconnected from the brake-release pressure supply circuit (63) and is released with the aid of a hydraulic fluid source (37) in opposition to the spring force of the spring-type actuator. According to the invention, to improve the method in order to reduce the risk of an accident after a failure of the brake-release pressure, the brake or brakes (10) is or are automatically re-connected to the brake-release pressure supply circuit (63) once the brake-release pressure is again made available. The invention also relates to a device and a hydraulic circuit for carrying out said method.