Tamping Unit With Offset Swivel Axes for Narrow Turnouts
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Solution Overview
Problem
Existing tamping units face challenges in maintaining track geometry due to limited space for tamping tines, especially in areas with obstacles like turnouts, requiring complex swivel mechanisms that increase the unit's size and complexity.
Innovation Solution
The tamping unit design features offset swiveling axes for inner and outer tamping tine supports, eliminating the need for adjacent swivel elements and incorporating a coupler arrangement with revolute joints, allowing for a compact and robust structure with synchronized tine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two tamping tines are arranged next to each other on each tamping tool, then a wide range of action is available, but there is too much space required for the swivel mechanism when obstacles are present
Solution Approach 1:
The patent transitions from a lateral arrangement of tamping tines to a vertical stacking arrangement. The inner and outer tamping tine supports are positioned one above the other rather than side by side, allowing both tines to penetrate the ballast simultaneously while occupying minimal lateral space. This dimensional change resolves the contradiction by maintaining adaptability for narrow spaces while reducing the volume required for the swivel mechanism.
2Adaptability or versatility
If laterally swivelable tamping tine supports are arranged on the tamping tool, then the tamping unit can adapt to obstacles, but the external dimensions of the tamping assembly increase
Solution Approach 1:
The patent repositions the swivel axes from a lateral arrangement to a vertical stacking arrangement. The inner tamping tine support swivels about a first swivel axis while the outer tamping tine support swivels about a second swivel axis positioned vertically above it. This reduces the lateral footprint of the tamping assembly while maintaining the ability to adapt to obstacles through the swivel mechanism.
3Ease of operation
If swivel drives are arranged for each tamping tine support, then independent control is achieved, but the device complexity increases
Solution Approach 1:
The patent employs a single swivel drive that controls both the inner and outer tamping tine supports through a coupled connection. The swivel drive is universally connected to both supports, allowing one drive mechanism to perform the function of controlling both tines independently through their respective swivel axes, thereby reducing overall device complexity while maintaining operational independence.
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 design optimizes space usage, reduces stress on bearings, enhances tamping quality, and facilitates simultaneous tamping of multiple sleepers with improved maneuverability and maintenance efficiency.
Implementation Method 1
tamping tools with tamping tines which penetrate the ballast bed with a vibration being applied to them and are squeezed towards each other during a tamping process
Implementation Method 2
each tamping tool comprises a swivelling lever which can be rotated about a squeezing axis
Implementation Method 3
a first contact element is arranged on an outer side of the inner tamping tine support, wherein a second contact element is arranged on an inner side of the outer tamping tine support and wherein the two contact elements engage with each other
Data Source
AI summary
A tamping assembly for tamping sleepers of a track has a tamping unit with tamping tools. The tamping tools are located opposite one another, are mounted on a height-adjustable tool support, and, by way of drives, can be caused to vibrate and can be fed relative to each other. Each tamping tool includes a pivot lever, which can be rotated about a feed axis, and an inner and an outer tamping pick retainer. Each tamping pick retainer can be laterally pivoted relative to the pivot lever. The outer tamping pick retainer can be pivoted about a first pivot axis and the inner tamping pick retainer can be pivoted about a second pivot axis. The second pivot axis is arranged at an offset to the first pivot axis. Thus, it is no longer necessary to adjacently arrange elements for pivoting the tamping pick retainers.