Tamper Stroke Adjustment Eccentric Bushing Mechanism
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Solution Overview
Problem
Existing road finishing machines face challenges in efficiently and precisely adjusting the tamper stroke of the tamper bar during operation, particularly due to complex and space-consuming toggle mechanisms and difficulties in activating adjusting transmissions directly mounted on the eccentric shaft.
Innovation Solution
A compact adjusting mechanism is introduced, which is spaced apart from the eccentric shaft and rotates along with it, allowing for continuous and precise adjustment of the tamper stroke by manipulating the eccentric bushing's angular position through a self-rotating adjusting mechanism, utilizing a power flow branched off from the eccentric shaft to achieve phase shifts with low force expenditure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a toggle mechanism is used for tamper stroke adjustment, then the adjustment can be achieved, but the device complexity increases and it occupies a lot of space
Solution Approach 1:
The patent extracts the adjusting mechanism from the direct mounting location on the eccentric shaft and positions it spaced apart therefrom. This separation removes the complex toggle mechanism from the compact eccentric shaft area, reducing local complexity while maintaining adjustment functionality through the rotating along arrangement.
Solution Approach 2:
The patent replaces the complex mechanical toggle mechanism with a simplified rotating along adjusting mechanism. This new mechanism uses the rotation of the eccentric shaft itself to drive the adjustment, substituting the traditional toggle linkage system with a more compact rotational system that achieves the same stroke adjustment function.
2Ease of operation
If the adjusting transmission is directly mounted on the eccentric shaft, then the adjustment can be made, but it is difficult to carry out the activation during operation
Solution Approach 1:
The patent introduces an intermediary rotating mechanism that is spaced apart from the eccentric shaft. This intermediary mechanism serves as a mediator between the operator and the eccentric shaft, allowing activation of the adjusting transmission during operation without direct mounting on the rotating shaft, thus improving ease of operation while maintaining a manageable device structure.
3Force
If a self-rotating adjusting mechanism spaced apart from the eccentric shaft is used, then the force expenditure is reduced, but the mechanism requires rotation along with the eccentric shaft
Solution Approach 1:
The patent applies dynamics by making the adjusting mechanism rotate along with the eccentric shaft rather than remaining stationary. This dynamic arrangement allows the mechanism to leverage the rotational motion of the shaft, reducing the force required for adjustment while the rotating along capability manages the complexity through synchronized motion.
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 solution enables precise and continuous tamper stroke adjustment with reduced mechanical complexity, lower force expenditure, and improved automation, leading to better paving results by simplifying the design and reducing the number of components required.
Implementation Method 1
at least one eccentric bushing mounted on an eccentric shaft supporting the same to be rotatable at a desired angle of rotation to thereby continuously variably set a desired tamper stroke of a tamper bar
Implementation Method 2
a power flow branched off from the eccentric shaft and causing a rotational movement of the adjusting mechanism or at least parts thereof being at least temporarily geared up or down
Data Source
AI summary
The disclosure relates to a road finishing machine with a screed for producing a paving layer, wherein the screed includes at least one compacting unit for precompacting paving material supplied to the screed. The compacting unit includes at least one eccentric bushing mounted on an eccentric shaft supporting the same at a desired angle of rotation to thereby continuously variably set a desired tamper stroke of a tamper bar of the compacting unit. For rotating the eccentric bushing on the eccentric shaft, an adjusting mechanism mounted spaced apart from the eccentric shaft and at least partially rotatable along with a rotary motion of the eccentric shaft can be activated. Furthermore, the disclosure relates to a method for a continuously variable tamper stroke adjustment at a compacting unit of a road finishing machine.