Bogie Centralized Primary Suspension via Elastic Articulation
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Solution Overview
Problem
Current railway bogies are complex and heavy due to their four primary suspensions, which complicates their structure and increases mass, limiting their ability to transport goods or people while maintaining railway track condition.
Innovation Solution
A bogie design featuring two main suspension devices connected to different axles via a single elastic articulation, replacing the traditional four primary suspensions with a simplified structure that maintains suspension performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If four primary suspensions are used to suspend the frame relative to the axles, then the suspension performance is maintained, but the structure becomes complex and the mass increases
Solution Approach 1:
The patent combines four separate primary suspension devices into a single elastic articulation that connects both axles to the frame. This merging of multiple suspension elements into one integrated component reduces structural complexity while maintaining the suspension function, directly resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The single elastic articulation performs multiple functions simultaneously: it suspends the frame relative to both axles, allows relative movement in multiple directions, and provides elastic deformation capabilities. This multi-functionality replaces the need for four separate suspension devices, reducing complexity while preserving suspension performance.
2Reliability
If four primary suspensions are used to suspend the frame relative to the axles, then the suspension performance is maintained, but the mass of the bogie increases
Solution Approach 1:
By merging four separate suspension devices into one elastic articulation, the total mass of suspension components is significantly reduced. The single articulation uses less material than four separate devices while providing equivalent suspension functionality, directly addressing the weight reduction goal.
Solution Approach 2:
The patent discards three of the four traditional primary suspension devices, keeping only one elastic articulation that performs the suspension function for both axles. This selective discarding of redundant components reduces bogie mass while the elastic properties of the remaining articulation ensure suspension performance is maintained.
3Ease of manufacture
If the axis of the connecting device is offset from the axis of the wheels, then the motor and reduction gear can be integrated, but the distance between the axis of the connecting device and the center of gravity increases
Solution Approach 1:
The patent offsets the connecting device axis from the wheel axis in the longitudinal dimension, allowing motor integration while managing the distance from the center of gravity. This dimensional offset enables the motor and reduction gear to be housed within the connecting device structure without excessively increasing the distance from the bogie's center of gravity.
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 significantly reduces the bogie's mass and complexity while maintaining suspension performance, allowing for increased cargo or passenger capacity while minimizing track degradation.
Implementation Method 1
a single elastic articulation (8) forming a suspension of the chassis with respect to the axles
Data Source
Figure 1~2
Figure 3~5
AI summary
Railway vehicle bogie (1) comprising two pairs of wheels (12, 13, 14, 15), the wheels (12, 13, 14, 15) of one pair being connected to each other by a linking device (18, 20) to form an axle (2, 3), said axles (2, 3) being connected to each other by a chassis (4), each of the axles (2, 3) being articulated to the chassis (4) about an axis (C-C') substantially parallel to the axis of the axles (2, 3), characterized in that: the bogie (1) comprises two main suspension devices (6, 7), each being connected on one side to a different axle (2, 3), and on the other side to an elastic joint (8) forming a suspension of the chassis (4) with respect to the axles (2, 3).