Rail Vehicle Sliding Step Partition Sealing
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Solution Overview
Problem
Sliding steps in vehicles, especially rail vehicles, are exposed to external weather influences, leading to dirt, moisture, and snow accumulation, which can affect the drive unit and control systems, and existing solutions often rely on complex and wear-prone seals or heating mechanisms.
Innovation Solution
A sliding step design with a step cassette and a slide-out mechanism where the drive means are guided through a partition wall, allowing the step to rest against it in the rest position, effectively sealing the openings and using elastic sealing materials to create a tight seal, eliminating the need for complex seals and protecting the drive unit from environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the step is extended through an opening in the step cassette to allow boarding and alighting, then the usability of the sliding step is improved, but the drive unit becomes exposed to dirt, moisture, and snow accumulation
Solution Approach 1:
The step cassette is divided into two separate compartments: a front compartment that remains open to allow the step to extend and retract, and a rear compartment that houses the drive unit and is sealed off from environmental factors. This segmentation allows the functional requirements of both accessibility and protection to be satisfied simultaneously.
Solution Approach 2:
The drive unit is extracted from the front compartment and placed into a separate rear compartment. This extraction removes the drive unit from the harmful environment while keeping it functionally connected to the step mechanism through the partition wall.
2Object-affected harmful factors
If seals and brushes are provided at the front opening to prevent dirt and moisture entry, then the protection of the step cassette is improved, but the complexity and wear of the sealing mechanism increases
Solution Approach 1:
The sealing function is extracted from the front opening and relocated to the partition wall separating the two compartments. The partition wall with its integrated sealing elements provides protection without requiring complex seals or brushes at the extension opening.
Solution Approach 2:
The partition wall with simple sealing elements provides a cost-effective and maintenance-free alternative to complex seal and brush mechanisms that would require regular replacement due to wear.
3Object-affected harmful factors
If the drive mechanism is housed in a separate rear casing with connecting rods guided through connecting openings, then the protection of the drive mechanism is improved, but the sealing complexity increases due to circumferential seals at each connecting opening
Solution Approach 1:
The drive mechanism is completely extracted into a separate rear compartment that is sealed off from the environment. The connection between the drive mechanism and the step is achieved through the partition wall structure itself, eliminating the need for separate connecting openings and their associated seals.
Solution Approach 2:
The functions of the partition wall, the sealing mechanism, and the connection structure are merged into a single integrated component. The partition wall serves as both the separator and the sealing element, simplifying the overall design.
4Object-affected harmful factors
If heating mats are installed beneath the step to prevent icing, then the protection against freezing is improved, but the energy consumption and device complexity increase
Solution Approach 1:
The step is extracted from the direct path of wind-blown snow by retracting it into the sealed rear compartment during cold weather. This passive protection against freezing eliminates the need for active heating systems.
Solution Approach 2:
The harmful effect of cold weather and snow is converted into a benefit by using the retraction mechanism to automatically protect the step during periods when freezing is most likely, eliminating the need for continuous heating.
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 design provides durable protection for the drive unit against moisture and dirt, reducing maintenance needs and ensuring the sliding step remains functional in adverse weather conditions without complex sealing mechanisms, while allowing air and moisture entry when in use.
Implementation Method 1
at least one sealing element arranged on the step and/or on the partition, in particular in the form of an elastic sealing material
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a sliding step for a vehicle, in particular for a rail vehicle, comprising a step cassette (10) and an extension (20) movably mounted within the step cassette (10), wherein the extension (20) has at least one step (21) and is movable between a working position and a rest position. The step (21) can be moved into the working position through an extension opening (15) on a front side of the step cassette (10). The interior of the step cassette (10) is further divided by at least one partition (30) extending between opposing side walls (11; 12) into a rear compartment (32) and a front compartment (31), wherein the step (21) moves within the front compartment (31), while a drive (60) for moving the extension (20) is located within the rear compartment (32).According to the invention, the drive means (22;23;61;62) for moving the step (21) is guided through the partition (30), and the step (21) rests against the partition (30) in the rest position of the extension (20).