Open Brake Carrier Mounting for Lighter Rail Chassis Frames
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Solution Overview
Problem
Existing methods for securing braking devices to rail vehicle chassis frames result in increased weight and torsional stiffness, which is undesirable for derailment safety and manufacturing costs.
Innovation Solution
A device with a cross-member and continuous brake carriers having open cross-sections, where securing points are spaced vertically from the cross-member, reducing the number of weld seams and torsional stiffness, and using attachment means like brackets or pivoted connections to minimize the impact on the chassis frame's torsional stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brackets are provided connected to the cross-member by means of welding to secure braking devices, then the braking devices can be secured to the chassis frame, but the weight increases and the weld seam contour becomes complex
Solution Approach 1:
The brake carrier is divided into multiple sections (first brake carrier section, second brake carrier section) that are connected to the cross-member at different locations. This segmentation allows the braking device to be secured while distributing the structural requirements, reducing the need for complex welded brackets and thereby reducing weight.
2Reliability
If supplementary members are secured to the lengthwise members to provide securing points, then the braking devices can be secured, but the attachment cost increases and the torsional stiffness increases
Solution Approach 1:
The cross-member serves multiple functions: it provides structural support for the chassis frame and simultaneously serves as the attachment structure for the brake carrier through its multiple securing points. This eliminates the need for separate supplementary members, reducing manufacturing cost while avoiding increased torsional stiffness.
3Reliability
If supplementary members are secured to the lengthwise members to provide securing points, then the braking devices can be secured, but the torsional stiffness of the chassis frame increases
Solution Approach 1:
The brake carrier extends in the transverse direction (perpendicular to the longitudinal axis of the cross-member) rather than along the lengthwise direction. This dimensional change allows the securing points to be positioned effectively for brake mounting while the cross-member's orientation ensures that the attachment does not significantly increase the torsional stiffness of the chassis frame.
4Device complexity
If a continuous brake carrier is used with securing points at each end, then the number of weld seams is reduced, but the attachment means must be designed to minimize impact on torsional stiffness
Solution Approach 1:
The cross-member acts as an intermediary structure between the brake carrier and the chassis frame. It provides the necessary attachment points for the brake carrier while its structural design ensures that the connection does not significantly alter the torsional stiffness of the overall chassis frame, thus mediating between the requirements of simplified welding and maintained structural stability.
Data Source
AI summary
A device for securing braking devices to a chassis frame of a rail vehicle forming a cross-member of the chassis frame that has a longitudinal axis, and includes at least two securing points for braking devices, wherein the securing points are spaced apart from the cross-member in a longitudinal direction which lies normal to the longitudinal axis, where at least one respective securing point is arranged at the end on a continuous brake carrier having an open cross section, where a connector is provided, via which the brake carrier is both connected to the cross-member and is spaced apart from the cross-member in a vertical direction to reduce the weight and so as not to simultaneously increase the warp stiffness of the chassis frame.