Dual-Spring Actuating Device for Freight Wagon Side Walls
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Solution Overview
Problem
Existing actuating devices for freight wagon side walls require high operational forces to open and close the side walls, with limited spring support only during the opening process, and are vulnerable to dynamic loads and weather conditions.
Innovation Solution
The actuating device incorporates two spring elements connected via levers to a pivot shaft, allowing spring force buildup in both opening and closing positions, with the leverage of gravity assisting in force application, and a sliding link mechanism for decoupling forces between levers and spring elements, enhancing robustness and reducing operational power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single spring element is used to support the pivot shaft movement, then the opening process is supported, but the closing process cannot be supported and high operational forces are required
Solution Approach 1:
The actuating device is segmented into two separate spring elements (first spring element and second spring element), each responsible for supporting one direction of movement. The first spring element supports the opening process while the second spring element supports the closing process, eliminating the limitation of single-direction support and reducing operational forces in both directions.
Solution Approach 2:
Two spring elements are combined in the actuating device to provide comprehensive support for both opening and closing operations. By integrating both spring elements into the same pivot shaft mechanism, the device achieves balanced force support in both directions of movement, resolving the contradiction between operational ease and device functionality.
2Ease of operation
If spring elements are used to support pivot shaft movement, then operational forces are reduced, but the device becomes more complex with additional components
Solution Approach 1:
The levers in the actuating device serve multiple functions: they transmit force from the spring elements to the pivot shaft, provide mechanical advantage to reduce operational forces, and coordinate the action of both spring elements. This multi-functionality reduces the need for additional components, balancing operational ease with device complexity.
Solution Approach 2:
The actuating device employs dynamic force distribution where the spring elements and levers work together to provide adaptive support during opening and closing operations. The system dynamically adjusts force application based on the direction of movement, optimizing operational ease while maintaining a relatively compact structure.
3Reliability
If the pivot shaft is actuated with high forces, then the side walls can be opened and closed reliably, but the drive power requirements increase and the device is more vulnerable to dynamic loads
Solution Approach 1:
The spring elements act as counterweight mechanisms that pre-load the pivot shaft in the closed position, creating a balanced force system. This counterbalancing reduces the net force required to actuate the pivot shaft during both opening and closing operations, thereby reducing drive power requirements while maintaining reliable side wall locking through the sustained spring force.
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 significantly reduces the drive power required for opening and closing the side walls, improves robustness, and protects against icing, providing reliable operation under dynamic and adverse conditions.
Implementation Method 1
the spring elements are hinged on one side to a rigid frame component of the freight wagon... both spring elements are relaxed when the pickup of the pivot arm is positioned vertically above the longitudinal axis of the pivot shaft... the build-up of spring force both when Allows pivoting of the sliding wall part into the open position as well as during its pivoting into the closed position
Implementation Method 2
This force does not have to be applied by external sources of force (e.g. in the form of a manual operator of the swivel shaft), but is at least partly due to the leverage of the gravity acting on the sliding wall part when it is deflected from the zero position via the at least one pickup or swivel arm and the associated lever introduced into the respective spring element
Data Source
Figure 1
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AI summary
The device has a pivotal arm (14) radially protruding from a pivot shaft (12) and flanged with a pick-up element (15). The shaft is connected with two spring elements (17a, 17b) over two levers (16a, 16b), respectively. Two rotational torques of the spring elements are applied on the shaft through the levers, respectively and oriented opposite to each other. The spring elements, the levers and the pivot arm are aligned with each other such that the spring elements are relaxed by positioning of the pick-up element of the pivotal arm vertically over a longitudinal axis of the shaft. The spring elements are designed as pressure springs, and the pick-up element is designed as a rail segment.