Rail Vehicle Chassis Coupling Rod Layout for Smooth Force Transfer
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Solution Overview
Problem
Existing rail vehicle chassis designs face challenges in connecting draw rods or draw/buffer rods due to limited installation space and excessive weight transfers during acceleration and braking, leading to inefficient force transmission and increased mechanical loading.
Innovation Solution
A chassis design with articulated coupling rods connected to drive units and wagon bodies, allowing for sprung coupling and decoupled longitudinal force transmission, minimizing weight transfers and enabling smooth acceleration and braking through adjustable spring stiffnesses and bearing apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If draw rods or draw/buffer rods are connected to end carriages of chassis frames, then longitudinal force transmission is achieved, but installation space is insufficient and angles become too great due to short lengths
Solution Approach 1:
The patent introduces a coupling rod as an intermediary element between the drive unit and the wagon body. This coupling rod replaces the traditional draw rod connection and enables longitudinal force transmission through a different mechanical path that utilizes available space more effectively, avoiding the angle and length problems of conventional draw rods
Solution Approach 2:
The force transmission path is segmented into multiple components: the coupling rod connected to the drive unit, the spring element for cushioning, and the connection to the wagon body. This segmentation allows each component to perform its specific function optimally while fitting within the constrained installation space
2Object-affected harmful factors
If draw rods are arranged to reduce weight transfers during starting or braking, then comfort is improved, but suitable arrangement frequently causes difficulties and installation becomes complex
Solution Approach 1:
A spring element is introduced as a mediator between the coupling rod and the wagon body connection. This spring element actively cushions weight transfers during starting and braking operations, reducing the harmful forces transmitted to the wagon body while maintaining a relatively simple overall arrangement
Solution Approach 2:
The spring stiffness parameter is specifically selected to optimize the cushioning effect. By adjusting the spring constant, the system adapts to different operating conditions and weight transfer scenarios, achieving comfortable operation without complex active control systems
3Force
If longitudinal followers with swivel pins are used, then force transmission is achieved, but pronounced weight transfer occurs and high force introduction points cause excessive loading
Solution Approach 1:
The coupling rod with spring element acts as a force-distributing intermediary. Instead of concentrating high forces at a single swivel pin connection point, the spring element distributes the force transmission over a longer path and time period, reducing peak loading on the chassis and wagon body structures
Solution Approach 2:
The spring element provides beforehand cushioning by being pre-loaded and ready to absorb force fluctuations. During operation, it proactively cushions against sudden force spikes during acceleration and deceleration, preventing excessive mechanical loading before it occurs
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 solution achieves low-wear, comfortable, and jolt-free operation by reducing mechanical loading and allowing for adaptive suspension behavior, while avoiding excessive rotational movements and optimizing force transmission.
Implementation Method 1
a first spring apparatus (42, 43, 44, 45) connected to the at least first drive unit (17, 18)
Implementation Method 2
mounted on the chassis frame (2, 3, 4, 5, 6, 7) via a first bearing apparatus (20) and a second bearing apparatus (21)
Data Source
AI summary
A chassis for a rail vehicle includes at least one chassis frame to which at least one first wheel set and a second wheel set are coupled and to which at least one first drive unit and a second drive unit are connected, wherein a first coupling rod is connected at least to the first drive unit in an articulated manner and is configured to be coupleable to the vehicle body of the rail vehicle in an elastic manner, such that advantageous structural conditions are achieved.