Rail Vehicle Chassis with Non-Load-Bearing Control Arrangement
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Solution Overview
Problem
Rail vehicles, particularly those with single-axle chassis, face challenges in navigating tight curves due to limited wheel flange heights and angles of attack, leading to increased wear and risk of derailment, while double-axle chassis struggle with limited axle load utilization and space constraints.
Innovation Solution
A chassis design featuring a non-load-bearing control arrangement that passively adjusts the alignment of main wheels relative to the rails, utilizing additional wheels to minimize transverse slip and maintain radial positioning, thereby reducing wear and derailment risk, and allowing for more efficient use of axle loads and space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If single-axle chassis are used to improve axle load utilization and reduce space requirements, then weight and space efficiency are improved, but tracking stability and derailment risk worsen due to limited wheel flange height and large angles of attack in curves
Solution Approach 1:
The patent introduces an intermediary control arrangement with additional wheels that act as a mediator between the single-axle chassis and the track. These additional wheels provide extra guidance points that stabilize the chassis frame during curving, preventing excessive angles of attack without requiring changes to the main wheel flange height or axle configuration.
Solution Approach 2:
The patent adds a dimensional element by introducing additional wheels positioned at different longitudinal locations on the chassis frame. This creates a multi-point contact system that controls the chassis frame's orientation in the transverse direction, adding a new degree of control beyond the single axle's two-wheel contact.
2Reliability
If double-axle chassis are used to improve tracking stability with clear position on track, then tracking stability is improved, but space requirements and support width increase
Solution Approach 1:
The patent extracts the guidance function from the traditional double-axle configuration and concentrates it into a single axle equipped with a control arrangement. The additional wheels on the single axle perform the guidance function that would otherwise require a second axle, eliminating the need for the extra support width while maintaining tracking stability.
Solution Approach 2:
The single axle with control arrangement performs multiple functions: the main wheels carry the vehicle load, while the additional wheels on the same axle provide guidance and stability control. This multi-functional design eliminates the need for separate axles dedicated to guidance, reducing the overall support width requirement.
3Ease of operation
If kinematic control through adjacent car body joints is used to control single-axle chassis, then positioning control is improved, but angles of attack increase and derailment risk worsens due to large distances between controlling elements
Solution Approach 1:
The control arrangement is designed to be dynamically adjustable, allowing the additional wheels to adapt their position and contact force based on the chassis frame's orientation and the curvature of the track. This dynamic control enables effective guidance even at tight curve radii without creating excessive angles of attack on the main wheels.
Solution Approach 2:
The control arrangement acts in advance to prevent excessive angles of attack by providing continuous guidance through the additional wheels. By maintaining proper alignment before critical misalignment occurs, the system prevents derailment conditions rather than reacting to them after they develop.
Data Source
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AI summary
The invention relates to a chassis (1) for a rail vehicle (100) and a rail vehicle (100). A chassis frame (2) for mounting on a car body (101) is provided, and at least two main wheels (3) are provided for supporting the vehicle frame (2) on rails (50), wherein the at least two main wheels (3) are rotatably suspended on the chassis frame (2). Furthermore, a non-load-bearing control arrangement (5) mounted on the chassis frame (2) is provided, which is configured to passively influence the alignment of the at least two main wheels (3) relative to the rails (50) when the at least two main wheels (3) are supported on the rails (50).