Rail Vehicle Running Gear Actuator Wheelset Alignment
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Solution Overview
Problem
Existing rail vehicle chassis designs face a conflict between achieving dynamic running behavior in curves and driving stability at high speeds, resulting in high wear on both wheelsets and tracks when cornering.
Innovation Solution
The chassis incorporates actuators connected to wishbone-style wheelset links, allowing for dynamic alignment of wheelsets to curve radii during cornering and fixed alignment during straight travel, minimizing wear and enhancing stability through controlled actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fixed bearings are used to connect wheelset guides to the bogie frame, then driving stability at high speed is improved, but wear on wheelsets and track increases during cornering
Solution Approach 1:
The patent applies the dynamics principle by replacing fixed bearings with actuators that enable dynamic adjustment of wheelset position. The actuators allow the wheelset guides to transition between a fixed state (for stability during straight travel) and a movable state (for optimal curve negotiation), resolving the contradiction between stability and wear by making the connection dynamic rather than static
Solution Approach 2:
The patent applies parameter changes by using actuators to modify the positional parameters of the wheelsets in real-time. During cornering, the actuators adjust the wheelset position to optimize curve negotiation, reducing wear. During straight travel, the wheelsets maintain a stable fixed position, ensuring driving stability at high speeds
2Stability of the object's composition
If wheelset position is fixed for straight travel, then driving stability is improved, but adaptability to curve radii deteriorates
Solution Approach 1:
The actuator system enables the wheelset guides to switch between fixed and movable states dynamically. During straight travel, the fixed state provides stability. During cornering, the actuators activate to allow positional adjustment, enabling the wheelsets to adapt to different curve radii and optimize traction
3Adaptability or versatility
If actuators are added to enable dynamic wheelset alignment, then adaptability to curves is improved, but device complexity increases
Solution Approach 1:
The actuators serve multiple functions: they enable dynamic positioning during cornering, maintain fixed positioning during straight travel, and can be controlled based on vehicle speed and curve characteristics. This multi-functionality justifies the added complexity by providing both stability and adaptability within a single integrated system
Data Source
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AI summary
The invention relates to running gear (FW1, FW2) for a rail vehicle, comprising a first wheelset (RS1), a bogie frame (DGR), a first wheelset link (RSL11) and a second wheelset link (RSL12). The first wheelset (RS1) is connected to the bogie frame (DGR) by means of the two wheelset links (RSL11, RSL12). Each wheelset link (RSL11, RSL12) is in the form of an A-arm and has three connection points (ASP111-ASP113, ASP121-ASP123). A first connection point (ASP111, ASP121) is in the form of a floating bearing and connects the associated wheelset link (RSL11, RSL12) to the first wheelset (RS1). A third connection point (ASP113, ASP123) is in the form of a fixed bearing and connects the associated wheelset link (RSL11, RSL12) to the bogie frame (DGR). According to the invention, a second connection point (ASP112) of the first wheelset link (RSL11) is connected to a first actuator (AKT11), while a second connection point (ASP122) of the second wheelset link (RSL12) is connected to a second actuator (AKT12). Said actuators (AKT11, AKT12) are controlled and fastened such that, during cornering of the rail vehicle, said actuators orient the first wheelset (RS1), in a controlled manner, to a curve radius (KR) or to a track bend to be traveled through.