Rail Brake Carrier Torsion-Free Force Alignment
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Solution Overview
Problem
Existing brake carriers for rail vehicles increase the weight of the chassis and introduce undesirable loads due to the transfer of braking torque, which complicates the structural design and weight optimization of the chassis frame.
Innovation Solution
The braking device is attached to the brake carrier such that the line of action of the braking forces passes through the thrust center located outside the cross section, achieving a twisting-free transverse force bending, allowing for a lighter design and reduced loads on the chassis frame by using a brake carrier with a torsionally soft open cross section and a rigid, joint-free connection to the longitudinal members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the brake carrier is connected rigidly to the chassis frame, then the braking torque is transferred to the chassis frame, but this leads to undesirable loads on the chassis frame
Solution Approach 1:
The invention extracts the harmful function (torque transfer) from the connection between brake carrier and chassis frame. By using a rigid but joint-free connection, the brake carrier is decoupled from the chassis frame in terms of torque transfer, while maintaining positional stability. This removes the harmful load transmission to the chassis frame.
Solution Approach 2:
The connection system is segmented into two independent parts: the rigid connection between brake carrier and longitudinal members (providing positional stability), and the joint-free interface between brake carrier and chassis frame (preventing torque transfer). This segmentation allows each connection to perform its specific function without interfering with the other.
2Stability of the object's composition
If the brake carrier is made heavier, then the structural stability is improved, but the weight of the chassis increases
Solution Approach 1:
The invention changes the structural parameters of the brake carrier by using an open cross-section design (C-shaped, U-shaped, T-shaped, or I-shaped) instead of a closed cross-section. This parameter change reduces the weight and material consumption while maintaining sufficient structural stability through the optimized open section geometry and its connection to the longitudinal members.
3Strength
If the brake carrier has a closed cross section, then the torsional stiffness is improved, but the weight and manufacturing complexity increase
Solution Approach 1:
The invention changes the cross-sectional parameter from closed to open form (C-shaped, U-shaped, T-shaped, or I-shaped). This parameter change reduces manufacturing complexity and weight, while the required torsional stiffness is compensated by the rigid joint-free connection to the longitudinal members, which provides the necessary structural support without requiring a closed cross-section.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a brake carrier for the bogies of rail vehicles, said carrier having an open cross-section with flexible torsion. The connection to the two longitudinal members of the bogie is designed as a rigid non-articulated connection and the braking device (6) is fixed to the brake carrier (3, 4) in such a way that the line of action of the braking forces runs through the shear centre (P) that lies outside the cross-section of the brake carrier (3, 4).