Rail Vehicle Return Motion Device for Crash Offset Reduction
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Solution Overview
Problem
In rail vehicles, especially those with high nominal operating speeds, excessive height offsets between impact partners during collisions lead to unsafe climbing scenarios, compromising the effectiveness of energy absorption elements and increasing the risk of injury and derailment, as existing anti-climbing devices often intervene too late and with insufficient engagement to prevent significant vertical offsets.
Innovation Solution
A rail vehicle design featuring a return device at the car body's first end, which interacts with a complementary return device on the impact partner to reduce existing height and transverse offsets by at least 20% of the impact element dimensions, ensuring optimal force distribution and preventing climbing by immediately engaging to minimize further offset as impact partners move closer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-climbing devices with transverse webs are arranged on side buffers, then climbing prevention is improved, but the devices intervene too late with considerable height offset already formed
Solution Approach 1:
The return device is designed to engage with the impact partner before the buffer plates make contact, preliminarily reducing the height offset between vehicles. This preliminary action prevents the formation of excessive height offset that would occur with conventional anti-climbing devices that only engage after buffer contact.
Solution Approach 2:
The return device with its return surface provides beforehand cushioning by engaging the impact partner and reducing height offset before the main impact occurs. This preparatory cushioning ensures that when the buffer plates subsequently contact, the height offset is already minimized, preventing climbing.
2Reliability
If conventional anti-climbing devices are used, then climbing is prevented to some extent, but excessive height offset compromises energy absorption element effectiveness
Solution Approach 1:
The return device performs preliminary action by reducing height offset before the main impact, ensuring that energy absorption elements engage under optimal conditions with minimal height offset. This preliminary positioning ensures both climbing prevention and effective energy absorption.
Solution Approach 2:
The return device acts as an intermediary between the vehicles during impact, mediating the height offset reduction before the buffer plates contact. This intermediary action ensures that the height offset is controlled within acceptable limits, allowing energy absorption elements to function effectively.
3Reliability
If return device engages early to reduce height offset, then climbing prevention is improved, but device complexity increases
Solution Approach 1:
The return device is integrated into the existing buffer device structure, allowing the buffer device to perform multiple functions: both cushioning normal operational shocks and reducing height offset during impacts. This multi-functionality reduces the need for separate dedicated anti-climbing devices.
Solution Approach 2:
The return device is merged with the buffer device structure, combining the functions of cushioning and height offset reduction in a single integrated system. This merging reduces overall device complexity compared to having separate buffer and anti-climbing devices.
Data Source
Figure 1
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AI summary
The rail vehicle (101) has railcar bodies (102,106), which define a vehicle longitudinal direction, a vehicle transverse direction and a vehicle vertical direction. A buffer device (103) is arranged on an end of the railcar body. The return motion devices are provided on the end of the railcar body. The motion device is designed to interact with a complementary return motion device at the impact partner during proceeding longitudinal displacement of the impact element (103.2) to reduce a height offset between the railcar body and the impact partner in the vehicle vertical direction.