Rail Vehicle Roll Stabiliser Push-Pull Rod Intersection
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Solution Overview
Problem
Existing rail vehicle roll stabilizers with angled push-pull rods experience increased dynamic forces and turning resistance, leading to reduced driving comfort and potential derailment risks due to unfavorable movement coupling and structural constraints.
Innovation Solution
The push-pull rods of the roll stabilizers are arranged to intersect at a point approximately on the axis of rotation of the chassis, forming a cone shape, with angles between 2° and 10° relative to the vertical plane, reducing maximum dynamic forces and maintaining symmetry across planes, thus minimizing turning resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If push-pull rods are arranged at an angle relative to the vertical direction, then structural flexibility is improved, but dynamic forces in the rods increase and turning resistance increases
Solution Approach 1:
The push-pull rods are arranged to intersect at a point on the axis of rotation of the chassis, extending into the longitudinal dimension rather than purely vertically. This spatial reconfiguration allows the rods to accommodate angular structural requirements while maintaining force equilibrium by distributing loads through a three-dimensional geometric arrangement centered on the rotation axis.
2Adaptability or versatility
If push-pull rods are arranged at an angle relative to the vertical direction, then structural flexibility is improved, but turning resistance of the chassis increases
Solution Approach 1:
By configuring the push-pull rods to intersect at the chassis rotation axis and extend into the longitudinal dimension, the system achieves angular structural flexibility without impeding chassis rotation. The geometric arrangement ensures that rod forces remain balanced during turning operations, preventing increased turning resistance despite the angled configuration.
Solution Approach 2:
The push-pull rods are arranged asymmetrically at angles relative to the vertical direction, with each rod positioned to intersect at the rotation axis. This asymmetric angular arrangement provides structural flexibility while maintaining rotational freedom, as the symmetry of the overall configuration around the rotation axis ensures balanced forces during turning.
3Force
If push-pull rods are arranged vertically, then dynamic forces are minimized, but structural adaptability is reduced
Solution Approach 1:
The solution extends the traditional vertical arrangement into the longitudinal dimension by configuring rods to intersect at the rotation axis. This creates a three-dimensional geometric arrangement that maintains the force-minimizing characteristics of vertical alignment while adding angular adaptability through longitudinal extension, allowing the structure to accommodate both vertical and angular requirements.
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 arrangement reduces the maximum dynamic forces in the push-pull rods to levels comparable to conventional vertical arrangements, extending their service life and reducing the need for frequent replacements while maintaining effective roll stabilization.
Implementation Method 1
The torsional shaft is accordingly subjected to a torsional moment which, depending on its torsional rigidity, is compensated at a specific torsional angle by a counter-torque resulting from its elastic deformation and thus prevents further rolling motion.
Data Source
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AI summary
The invention relates to a rail vehicle comprising at least one chassis and at least one roll stabiliser which is connected to two different vehicle parts of the rail vehicle, the roll stabiliser comprising - a torsion shaft (1) that is arranged on a vehicle part transversally to the longitudinal direction of the vehicle, - levers (2) that are non-rotationally arranged on the torsion shaft at both sides of the longitudinal axis of the vehicle - an individual traction-pressure rod (3) for each lever (2), each lever being hinge-connected to one end of the traction-pressure rod and said traction-pressure rod being hinge-connected at its other end (5) to the other vehicle part. In order to reduce the dynamic forces on the traction-pressure rods in the oblique arrangement thereof, the imaginary extensions of the traction-pressure rods (3) intersect at a point which lies approximately on the axis of rotation of the turning motion of the chassis.