Railway Bogie Braking System Height Reduction
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Solution Overview
Problem
High-speed train bogies require significant height due to braking systems between wheels, making access difficult for persons with reduced mobility and bulky objects, as the minimum overall height is typically greater than 1000 mm, necessitating multiple steps between the vehicle floor and platform.
Innovation Solution
A railway vehicle bogie design featuring a braking system mounted on each wheel and outside each wheel, eliminating the need for braking discs between wheels, with a primary suspension system using transverse torsion bars to reduce overall height, allowing a lower vehicle body and improved accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If braking discs are placed between the wheels on the axle structure, then the required braking performance for high-speed trains is achieved, but the overall height of the bogie increases to more than 1000 mm, making access difficult
Solution Approach 1:
The braking system is repositioned from a vertical arrangement between the wheels to a horizontal arrangement on the outer sides of the wheels. The braking discs are mounted on the axle structure outside the wheel pairs, and the brake calipers approach from the radial direction, effectively moving the braking function to a different spatial dimension and eliminating the vertical space requirement.
Solution Approach 2:
The braking system is divided into independent braking units, each associated with a specific wheel pair. Each braking unit includes a braking disc mounted on the axle structure and brake calipers that can be independently actuated, allowing the braking function to be distributed rather than concentrated in a single vertical space between wheels.
2Ease of operation
If the bogie height is reduced to improve accessibility, then access for persons with reduced mobility is facilitated, but the braking performance may be compromised
Solution Approach 1:
The braking system is repositioned from a vertical arrangement between the wheels to a horizontal arrangement on the outer sides of the wheels. The braking discs are mounted on the axle structure outside the wheel pairs, and the brake calipers approach from the radial direction, effectively moving the braking function to a different spatial dimension and eliminating the vertical space requirement.
3Length of stationary object
If multiple steps are installed to maintain high bogie height, then the structural requirements are met, but access becomes troublesome for persons with reduced mobility and bulky objects
Solution Approach 1:
The braking system is repositioned from a vertical arrangement between the wheels to a horizontal arrangement on the outer sides of the wheels. The braking discs are mounted on the axle structure outside the wheel pairs, and the brake calipers approach from the radial direction, effectively moving the braking function to a different spatial dimension and eliminating the vertical space requirement.
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 reduces the overall height of the bogie, facilitating easier access by lowering the vehicle floor while maintaining effective braking performance, as the braking system is distributed on and outside the wheels, reducing the vertical space required and eliminating the need for high steps.
Implementation Method 1
each device primary suspension device comprises a transverse torsion bar
Implementation Method 2
the braking device mounted on each wheel comprises a braking clamp acting on the wheel, the braking device mounted outside of each wheel comprises a disc and a braking clamp acting on the disc
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a railway vehicle bogie (10), comprising: - two pairs of wheels (12), the wheels (12) of each pair being connected to each other by a respective axle structure (14), the axle structures (14) defining an internal space, - a frame (16), each axle structure (14) being supported by the frame (16), and - a braking system (18). The braking system (18) comprises a braking device (50) mounted on each wheel (12) and a braking device (52) mounted on the outside of each wheel (12), the outside of a wheel being defined as the space opposite the internal space.