Modular Tugger Train Steering Mechanism for Uneven Terrain
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Solution Overview
Problem
Conventional tugger trains face challenges in achieving directional stability and driving stability on uneven ground with existing design, requiring complex steering couplings and limited adaptability for load handling.
Innovation Solution
A modular tugger train system where individual units are coupled via a steering mechanism that allows the rear wheels to be steered independently, with a chassis design that includes pivotable and adjustable load-carrying frames, enabling optimal directional stability and flexibility in terrain handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional tugger trains use mechanical forced coupling for rear wheel steering via rigid axles and steering rods, then steering capability is achieved, but device complexity and structural complexity increase significantly
Solution Approach 1:
The patent extracts and eliminates the complex mechanical forced coupling system (rigid axles, steering rods, and associated coupling mechanisms) from the conventional tugger train design. Instead, each modular unit is equipped with its own independent steering mechanism that controls the rear wheels directly, removing the need for long-distance mechanical force transmission from front to rear chassis parts.
Solution Approach 2:
The tugger train is divided into independent modular units, each with its own steering mechanism. This segmentation allows each unit to steer its rear wheels independently without requiring complex inter-unit mechanical coupling, thereby reducing overall system complexity while maintaining steering capability.
2Adaptability or versatility
If conventional tugger trains use drawbar coupling for individual carriages, then modular assembly is achieved, but directional stability deteriorates due to lack of coordinated steering
Solution Approach 1:
The patent introduces dynamic steering control to the modular units, where the rear wheels of each unit can actively adjust their orientation in response to the unit's position and movement. This dynamic adjustment maintains directional stability across the entire train composition, preventing the cutting-in effect that occurs with static drawbar coupling configurations.
Solution Approach 2:
The steering mechanism incorporates feedback based on the positional relationship between consecutive modular units. The rear wheel steering angle is determined by the position of the front unit's rear undercarriage part, creating a feedback loop that ensures directional stability while preserving modular assembly flexibility.
3Ease of operation
If conventional tugger trains route steering coupling along the entire length of the car from front to rear chassis part, then rear wheel steering is achieved, but ease of manufacture and structural simplicity deteriorate
Solution Approach 1:
The patent removes the lengthy steering coupling mechanism that would extend from the front to the rear chassis part. Each modular unit instead contains a compact steering mechanism positioned locally, eliminating the need for long-distance mechanical linkages and simplifying the manufacturing process.
Solution Approach 2:
Each modular unit is designed to be self-sufficient with its own steering mechanism, eliminating the need for complex inter-unit steering linkages. This self-service approach simplifies manufacturing by allowing units to be produced independently and assembled without complex alignment requirements for steering components.
Data Source
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AI summary
The gear unit has a front wagon landing gear part (1) with front wagon rear wheels (7a, 7b), and a rear wagon landing gear part (2) with rear wagon front wheels (8a, 8b), where the rear wagon landing gear part is rotatable around a vertical axle (3) and movably coupled with the front wagon landing gear part. A steering mechanism is arranged for steering the front wagon rear wheels relative to the vertical axle as a function of a rotational position of the rear wagon landing gear part with respect to the front wagon landing gear part. An independent claim is also included for a tugger train modular unit.