Rail Vehicle Power Converter Pendulum Mounting
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Solution Overview
Problem
Bogies equipped with traction motors and power converters experience significant mechanical stress due to vibrations and jerky movements, leading to reduced service life of power converters compared to those not exposed to such loads.
Innovation Solution
A power converter is mounted in an oscillating manner using a pendulum connection to the car body floor, with a link mechanically coupling the bogie frame to the power converter, allowing it to swing and reducing mechanical stress, while ensuring the power converter cannot oscillate arbitrarily, thus maintaining a minimal space requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power converter is directly mounted on the bogie frame, then the space requirement is minimized, but the mechanical stress and vibrations from the bogie are transmitted directly to the power converter, reducing its service life
Solution Approach 1:
A pendulum suspension system is introduced as an intermediary between the bogie frame and the power converter. The pendulum acts as a mechanical mediator that decouples the direct transmission of vibrations and shocks from the bogie to the power converter, thereby protecting the power converter while maintaining a relatively simple overall structure
Solution Approach 2:
The mounting structure transitions from a rigid fixed mounting to a dynamic pendulum suspension system. The pendulum allows the power converter to move dynamically in response to bogie vibrations, absorbing mechanical stress through controlled oscillation rather than rigidly transmitting all forces to the power converter
2Reliability
If the power converter is allowed to oscillate freely via pendulum connection, then mechanical stress is reduced, but the power converter may oscillate arbitrarily requiring more space within the bogie frame
Solution Approach 1:
The pendulum connection provides partial oscillation freedom rather than complete free movement. The power converter is allowed to oscillate to a limited extent sufficient to absorb mechanical stress, but the pendulum's physical constraints prevent arbitrary large-amplitude oscillations, optimizing the balance between stress reduction and space utilization
3Volume of moving object
If the link forces the power converter to move with the bogie frame during cornering, then space requirement is minimized, but the mechanical coupling may transmit some stress to the power converter
Solution Approach 1:
The link connecting the bogie frame to the power converter is designed with articulated joints that allow dynamic movement. During cornering, the link forces the power converter to move with the bogie frame to minimize space requirements, but the articulated nature of the connection allows the power converter to simultaneously accommodate some of the dynamic stresses through controlled movement
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 solution significantly increases the service life of power converters by minimizing mechanical stress and allowing forced movement, which reduces the space needed within the bogie frame.
Implementation Method 1
a power converter is held in an oscillating manner by means of at least one pendulum directly or indirectly from the car body floor of the car body located above
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a vehicle, in particular a rail vehicle (1), comprising at least one bogie (10) which supports a car body (6) located above said bogie and has at least two track guide units, in particular at least two wheel sets. According to the invention, it is provided that a power converter (120) is indirectly or directly held by means of the car body floor (6a) of the car body (6) that is located thereabove and that at least one linkage (400) mechanically couples the bogie frame (11) to the power converter (120).