Bogie Suspension Traction Device for Low-Floor Rail Vehicles
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Solution Overview
Problem
Existing bogies for low-floor articulated rail vehicles have poor curving performance, high floor height, and cumbersome traction systems, which affect stability, ride comfort, and maintenance costs.
Innovation Solution
A bogie design featuring two groups of swing bolster mechanisms connected via rotary and traction rod mechanisms, with a lifting device and oiling system, to improve curving performance, reduce floor height, and enhance ride comfort and reliability, while simplifying the structure and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If traditional bogie structure is used, then floor height is reduced, but curving performance deteriorates
Solution Approach 1:
The bogie structure is segmented into independent functional modules: swing bolsters for curving, traction rod mechanisms for force transmission, and suspension systems for stability. This segmentation allows each component to optimize its function without compromising overall performance, enabling low floor height while maintaining excellent curving capability through the swing bolster's independent rotation capability.
2Force
If complex traction device is used, then traction force is improved, but structure complexity increases
Solution Approach 1:
The patent merges the traction and braking force transmission functions into a single integrated traction rod mechanism. The traction rod directly connects the swing bolster to the frame, combining both traction and braking capabilities in one simple structural element, thereby achieving strong traction force while minimizing structure complexity.
Solution Approach 2:
The traction rod mechanism serves multiple functions simultaneously: it transmits traction force, transmits braking force, and accommodates the longitudinal movement of the swing bolster. This multi-functionality eliminates the need for separate mechanisms for each function, reducing overall system complexity while maintaining effective force transmission.
3Area of stationary object
If swing bolster mechanisms are closely connected, then space utilization is improved, but vibration transmission increases
Solution Approach 1:
The central cross beam acts as an intermediary structure between the two swing bolster mechanisms. It provides a rigid mounting platform that spatially separates the connection points of the two mechanisms, allowing compact arrangement while preventing direct vibration transmission between adjacent bolsters through the frame structure.
4Ease of manufacture
If number of bogies is reduced, then manufacturing cost is improved, but load bearing capacity deteriorates
Solution Approach 1:
The swing bolster mechanism introduces dynamic adaptability to the bogie structure. The ability of the swing bolster to rotate and adjust its position allows a single bogie to handle varying load conditions and curving requirements more effectively, compensating for the reduced number of bogies while maintaining adequate load bearing capacity through optimized force distribution.
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 design enhances curving performance, reduces floor height for easier access, improves ride comfort, and decreases maintenance costs by simplifying the structure and reducing the number of bogies required.
Implementation Method 1
a slewing bearing (14)
Implementation Method 2
a lifting device is provided between the lower portion of the swing bolster and the frame
Implementation Method 3
the bayonet at the bottom of the lifting rod will be stuck in the lifting opening, playing the role of a vertical stop
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present disclosure relates to a suspension traction device of a low floor articulated rail vehicle, which comprises swing bolster mechanisms, traction rod mechanisms, primary springs and secondary springs. Two swing bolster mechanisms and two traction rod mechanisms are provided, two swing bolster mechanisms are provided respectively in the middle of two groups of wheel-sets. Each swing bolster mechanism is connected to the frame by a set of traction rod mechanisms and is connected to the vehicle body by means of a rotary mechanism. The disclosure has the advantages of simple and compact structure and light weight. It not only realizes the transmission of the traction and the braking force when the vehicle is running, carries the vertical, horizontal and vertical load, which greatly improves the small curving performance of the vehicle, but also reduces the height of the floor surface and the driving performance of the vehicle has also been greatly improved.