Rail Vehicle Door Carrier With Elastic Deflection
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Solution Overview
Problem
Existing sliding door modules for rail vehicles are rigid, leading to unmitigated shock transmission, reduced service life of linear guides, and decreased energy efficiency due to their heavy and inflexible design, particularly in urban traffic where frequent acceleration and braking occur.
Innovation Solution
A sliding door module with a 'soft' carrier design that acts like a leaf spring, mitigating impact transmission and reducing weight, featuring guide carriages mounted on a profile rail with rolling elements and a cross-member connection for improved deflection compensation and vibration control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid support structure is used for the sliding door module, then the linear guide maintains precision and stability, but shocks from rail vehicle operation are transmitted unmitigated to the linear guide, reducing its service life
Solution Approach 1:
The patent applies beforehand cushioning by designing the support structure with intentional deflection capability (at least 0.015mm per kg of door leaf weight) to absorb shocks before they reach the linear guide. This pre-planned flexibility acts as a cushion that protects the linear guide from impact damage, extending its service life while maintaining operational reliability.
Solution Approach 2:
The patent changes the key parameter of support structure rigidity from high (rigid) to controlled flexibility (deflecting at least 0.015mm per kg). This parameter change allows the structure to absorb shocks through elastic deformation while still providing adequate support for the linear guide, resolving the contradiction between protection and precision.
2Use of energy by moving object
If a rigid support structure is used for the sliding door module, then structural stability is maintained, but the overall weight of the rail vehicle increases, negatively affecting energy efficiency
Solution Approach 1:
The patent changes the weight parameter of the support structure by reducing material usage and optimizing the design to achieve controlled deflection. By allowing the structure to deflect at least 0.015mm per kg of door leaf weight, the support structure can be made lighter while still providing adequate support, thereby reducing overall vehicle weight and improving energy efficiency.
Solution Approach 2:
The patent applies dynamics by transitioning from a static rigid structure to a dynamic flexible structure that can deflect under load. This dynamic capability allows the support structure to use less material (reducing weight) while maintaining functionality through elastic deformation, thus improving energy efficiency without sacrificing structural adequacy.
3Object-affected harmful factors
If a flexible support structure with high deflection is used, then shock transmission is mitigated and weight is reduced, but the linear guide may experience excessive movement and wear
Solution Approach 1:
The patent precisely controls the deflection parameter within a specific range (at least 0.015mm per kg of door leaf weight) to balance shock absorption and linear guide stability. This controlled parameter ensures sufficient shock mitigation while preventing excessive movement that would cause wear, thereby maintaining linear guide reliability.
Solution Approach 2:
The patent incorporates feedback by using the linear guide's performance as a reference to optimize the support structure's deflection characteristics. The deflection is designed to be sufficient to absorb shocks but controlled to maintain proper alignment and reduce wear on the linear guide, creating a balanced system where the linear guide's stability informs the support structure design.
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 extends the service life of linear guides, enhances energy efficiency, and shifts resonant frequencies to higher frequencies, reducing significant vibrations and improving the overall performance of rail vehicle door systems.
Implementation Method 1
The carrier (3) is specifically designed to be 'soft', so that it essentially acts like a leaf spring and in this way the transmission of impacts acting on the rail vehicle to the sliding door module/pivoting sliding door module (1) is mitigated
Implementation Method 2
The at least one guide carriage/guide carriage is mounted on the profile rail, and the door leaf is movably mounted with the aid of the at least one guide carriage/guide carriage. These linear roller guides are mainly known from the construction of machine tools
Implementation Method 3
The reduced weight of the carrier not only improves the energy efficiency of the rail vehicle, but also shifts the resonant frequency of the sliding door module/pivoting sliding door module towards higher frequencies, as a result of which vibrations with a significant amplitude cannot be excited or can only be excited to a small extent
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A sliding door module/swing-sliding door module (1) for a rail vehicle is specified, comprising at least one door leaf (2) and a support (3) aligned longitudinally in the sliding direction of the door leaf (2). Furthermore, the sliding door module/swing-sliding door module (1) comprises a linear guide with a profile rail (15) and at least one guide carriage/guide slide (4), wherein the profile rail (15) is attached to the support (3) or encompassed by it in the form of a profile section. The at least one guide carriage/guide slide (4) is slidably mounted on the profile rail (15), and the door leaf (2) is slidably mounted with the aid of the at least one guide carriage/guide slide (4). The maximum static deflection (yl) of the support (3) with respect to its bearing points (7, 8, 12, 13) is, with the door leaf (2) open, in the range of a clear door width LW of 800 mm to 2300 mm, at least y1=0.007⋅eLW800-1 millimeters per kilogram of door leaf weight.