Rail Vehicle Running Gear Brake Layout for Stable Braking
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Solution Overview
Problem
Existing rail vehicle chassis designs face challenges in maintaining consistent braking forces due to relative movements between the chassis frame and wheelsets, leading to reduced braking efficiency and increased wear, especially when active wheel control is employed, and they often result in complex structures and high assembly costs.
Innovation Solution
The brake unit is positioned on a swing arm that connects the wheelset or wheels to the chassis frame, with its center of gravity located at a primary suspension position, allowing the primary springs to decouple the brake unit from wheel-rail contact influences and eliminating the need for consoles, thus reducing the load on the chassis frame and minimizing the number of parts and weld seams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the brake unit is arranged on the chassis frame, then the braking forces are directly transmitted to the chassis frame, but this increases the load on the chassis frame and requires additional consoles and weld seams
Solution Approach 1:
The brake unit is extracted from the chassis frame and relocated to the swing arm. This removes the brake unit from its problematic position on the chassis frame, eliminating the need for consoles and weld seams while maintaining effective braking force transmission to the wheelset.
Solution Approach 2:
The swing arm serves as an intermediary component between the chassis frame and the brake unit. By mounting the brake unit on the swing arm, the braking forces are transmitted through the swing arm's existing connection to the chassis frame, avoiding direct mounting on the chassis frame and reducing structural complexity.
2Reliability
If the brake unit is positioned away from the primary suspension position, then the brake unit is exposed to wheel-rail contact influences, but positioning it at the primary suspension position increases unsprung mass
Solution Approach 1:
The brake unit is positioned at the center of gravity of the swing arm, which is the equipotential point of the primary suspension system. This positioning ensures that the brake unit moves with the swing arm without creating additional moments or forces, effectively protecting it from wheel-rail contact influences while minimizing the increase in unsprung mass.
3Device complexity
If the brake unit is mounted on the chassis frame, then the structure is simplified, but relative movements between chassis frame and wheelset reduce braking efficiency and increase wear
Solution Approach 1:
The brake unit is mounted on the swing arm, which is a dynamic component that moves with the wheelset. This dynamic mounting allows the brake unit to maintain a consistent position relative to the wheelset during relative movements between the chassis frame and wheelset, ensuring consistent braking efficiency and reducing wear without requiring a complex mounting structure.
4Strength
If the brake unit is positioned far from the swing arm connection points, then the primary springs have less effect on the brake unit, but this exposes sensitive brake components to mechanical shocks from wheel-rail contacts
Solution Approach 1:
The brake unit is positioned at the center of gravity of the swing arm, which acts as a counterbalance point. This positioning creates a mechanical advantage where the primary springs can effectively counteract mechanical shocks from wheel-rail contacts, protecting sensitive brake components while maintaining the necessary structural strength.
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 configuration enhances braking efficiency by maintaining consistent contact forces, reduces wear, and simplifies the chassis design, leading to a more compact, lightweight, and cost-effective solution with lower unsprung masses and improved mechanical protection of sensitive brake components.
Implementation Method 1
the primary springs to decouple the brake unit from wheel-rail contact influences
Implementation Method 2
A brake actuator, which can be designed, for example, as a pneumatic cylinder or as a hydraulic cylinder
Implementation Method 3
A brake actuator, which can be designed, for example, as a pneumatic cylinder or as a hydraulic cylinder
Implementation Method 4
The brake block or brake pad contacts a wheel or brake disc, creating a friction pairing
Implementation Method 5
Electromagnets arranged on eddy current braking units generate unsteady magnetic fields, which cause a braking effect on chassis
Implementation Method 6
Electromagnets arranged on eddy current braking units generate unsteady magnetic fields, which cause a braking effect on chassis
Data Source
Figure 1~2
AI summary
The invention relates to a running gear for a rail vehicle, wherein the running gear comprises at least one running gear frame, at least one wheelset (2) or at least one wheel pair, at least two wheelset guide bushes (11), at least two primary springs, and at least one brake unit (16). In order to create advantageous design conditions, the at least one brake unit (16) according to the inventions is arranged on a component of the running gear that connects the at least one wheelset (2) or the at least one wheel pair to the at least one running gear frame (1) and the center of gravity of the brake unit (16) lies in a primary-sprung position of the running gear. Thus, the advantage of relieving the running gear frame (1) of forces from the brake unit (16) is achieved, as well as mechanical decoupling of sensitive components of the brake unit (16) from the wheelset (2) or the wheel pair.