Inner-Toothed Gear Train for Continuous Tamper Stroke Adjustment
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Solution Overview
Problem
Existing tamper devices for road pavers can only switch between two preselected tamper bar strokes, requiring the machine to stop and reverse direction to adjust, which disrupts continuous operation.
Innovation Solution
A tamper device with a rotatable driveable tamper shaft, eccentric bushing, and connecting rod, utilizing an inner-toothed hollow wheel gear train for adjustable stroke adjustment during operation, allowing individual and continuous adjustment of the tamper bar stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the machine stops and reverses direction to adjust the tamper bar stroke, then the stroke can be switched between two preselected positions, but continuous operation is disrupted and productivity decreases
Solution Approach 1:
The patent makes the stroke adjustment dynamic by allowing it to be performed during continuous operation rather than requiring machine stoppage. The gear train enables the eccentric bushing to rotate relative to the tamper shaft while the machine is running, transforming a static adjustment process into a dynamic one that maintains productivity.
Solution Approach 2:
The gear train acts as an intermediary mechanism that decouples the adjustment action from the machine's main operation. By introducing this intermediate gear system, the operator can adjust the stroke independently without stopping the tamper shaft or disrupting the paving process.
2Productivity
If a gear train is introduced for continuous stroke adjustment, then productivity is maintained, but device complexity increases
Solution Approach 1:
The gear train is designed to be self-contained and self-driven, utilizing the rotation of the tamper shaft itself to power the adjustment mechanism. The drive force receiving element captures energy from the tamper shaft's rotation, making the system self-sufficient and eliminating the need for external motors or power sources.
Solution Approach 2:
The patent replaces complex electrical or hydraulic adjustment systems with a purely mechanical gear train. This mechanical substitution simplifies the overall system by using straightforward gear engagement and rotation rather than requiring sensors, motors, control systems, or hydraulic circuits.
3Device complexity
If only two preselected stroke positions are provided, then the device structure is simple, but adaptability to varying screed sections is limited
Solution Approach 1:
The patent transforms the static two-position adjustment into a dynamic continuous adjustment system. By enabling the eccentric bushing to rotate to any angular position during operation, the system provides infinite stroke position options rather than being limited to two fixed positions, greatly enhancing adaptability.
Solution Approach 2:
The invention changes the discrete parameter of stroke position into a continuous variable. Instead of being constrained to two specific stroke lengths, the operator can now adjust the stroke to any value within the available range by rotating the eccentric bushing to different angular positions, effectively transforming the parameter from discrete to continuous.
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
Enables continuous adjustment of the tamper bar stroke without stopping the machine, accommodating varying screed sections and avoiding costly interruptions, with a reliable and cost-effective gear mechanism.
Implementation Method 1
an inner-toothed hollow wheel gear train for providing the rotational adjustment. The gear train is connected to the tamper shaft, to the eccentric bushing, and to a drive force receiving element
Implementation Method 2
a rotatable driveable tamper shaft comprising an eccentric section, an eccentric bushing mounted on the eccentric section, and a connecting rod being rotatable mounted on the eccentric bushing for being driveable with stroke motions having a stroke
Data Source
AI summary
The invention relates to a tamper device for a screed of a working machine, in particular a paver. The device comprises a rotatable driveable tamper shaft with an eccentric section, an 5 eccentric bushing mounted on the eccentric section, and a connecting rod rotatable mounted on the eccentric bushing for being driveable with stroke motions having a stroke, the stroke being adjustable by an rotational adjustment of a relative rotational positioning between the eccentric bushing and the eccentric section. The device further comprises an inner-toothed hollow 10 wheel gear train for providing the rotational adjustment. The gear train is connected to the tamper shaft, to the eccentric bushing, and to a drive force receiving element configured to be able to receive a drive force for driving the innertoothed hollow wheel gear train when the tamper shaft is rotating.