Tamper Stroke Adjustment With Eccentric Bushing Phase Control
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Solution Overview
Problem
Existing road finishing machines face challenges in efficiently adjusting the tamper stroke due to complex and space-consuming mechanisms, making it difficult to achieve precise and continuous variable adjustments during paving operations.
Innovation Solution
A compact and efficient adjusting mechanism is integrated onto the eccentric shaft of the road finishing machine, allowing for a direct and torque-proof connection with the eccentric bushing, enabling precise and continuous tamper stroke adjustment through a phase adjustment mechanism driven by an adjusting drive, which can be hydraulically, electrically, or mechanically actuated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a toggle mechanism is used for tamper stroke adjustment, then the adjustment range is sufficient, but the device complexity increases and space occupation increases
Solution Approach 1:
The patent combines the adjusting drive and adjusting transmission into an integrated unit that is directly mounted on the eccentric shaft. This merging of components eliminates the need for separate toggle mechanisms and intermediate transmissions, reducing overall device complexity while maintaining the full adjustment range through direct phase adjustment of the eccentric bushing.
Solution Approach 2:
The adjusting drive mounted on the eccentric shaft serves multiple functions: it directly adjusts the phase angle of the eccentric bushing, controls the tamper stroke variation, and integrates the transmission function within itself. This multi-functionality replaces the need for separate adjusting mechanisms, reducing complexity while preserving adaptability.
2Device complexity
If an adjusting transmission is directly mounted on the eccentric shaft, then the device complexity is reduced, but the ease of operation for activation deteriorates
Solution Approach 1:
The patent introduces a hydraulic cylinder as an intermediary actuator that converts hydraulic pressure into linear motion, which then rotates the eccentric bushing via a connecting rod. This intermediary mechanism makes activation easier by allowing remote hydraulic control rather than direct mechanical manipulation near the eccentric shaft.
Solution Approach 2:
The patent replaces direct mechanical activation with hydraulic actuation. The hydraulic system substitutes for manual or mechanical operating mechanisms, making activation easier through fluid power transmission while keeping the adjusting transmission compact and directly mounted on the eccentric shaft.
3Manufacturing precision
If a threaded rod and threaded bushing mechanism is used, then the manufacturing precision can be achieved, but the device complexity and space occupation increase
Solution Approach 1:
The patent replaces threaded mechanical adjustment with hydraulic actuation. The hydraulic cylinder provides precise positioning of the eccentric bushing through controlled fluid pressure and flow, eliminating the need for threaded rods and bushings while maintaining manufacturing precision through hydraulic control systems.
Solution Approach 2:
The patent uses a hydraulic cylinder to achieve precise tamper stroke adjustment. Hydraulic systems provide fine control through pressure regulation and flow control, replacing mechanical threading mechanisms with fluid-based positioning that achieves high precision without the complexity of threaded components.
4Adaptability or versatility
If bearing supports are horizontally displaced for adjustment, then the tamper stroke can be adjusted, but the ease of operation during operation deteriorates and force expenditure increases
Solution Approach 1:
The patent replaces manual horizontal displacement of bearing supports with hydraulic actuation. The hydraulic cylinder automatically positions the eccentric bushing by converting hydraulic pressure into rotational motion, eliminating the need for manual force application and making adjustment easier during operation.
Solution Approach 2:
The hydraulic adjusting system is self-actuating through fluid pressure. Once hydraulic pressure is applied, the system automatically performs the adjustment without requiring manual intervention to displace bearing supports or apply force to mechanical adjustment mechanisms.
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 allows for precise and continuous tamper stroke adjustment with reduced force expenditure, resulting in a compact design that is less prone to wear and tear, and can adapt dynamically to process parameters for optimal paving results.
Implementation Method 1
at least one eccentric bushing (12) mounted on an eccentric shaft (8) supporting the same to be rotatable at a desired angle of rotation to thereby continuously variably set a desired tamper stroke (11) of a tamper bar (6)
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 and rotatable to 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, the compacting unit includes at least one adjusting mechanism, wherein the adjusting mechanism includes an adjusting drive mounted on the eccentric shaft and rotatable along with the eccentric shaft. The disclosure furthermore relates to a method for a continuously variable tamper stroke adjustment at a compacting unit of a road finishing machine.