Roller Compactor Pendulum Arm With Elastomeric Torsion Compensation
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Solution Overview
Problem
Torsional loads on the pendulum arm and its upper pivot bearing are significant issues in existing roller compactors, particularly when one roller body is engaged with waste and during direction reversal.
Innovation Solution
A pendulum arm with a torsional compensation coupling that includes freely rotatable coupling elements with elastomeric stop elements to absorb peak loads and limit pivot angles, preventing direct contact and reducing torsional stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If a pendulum arm is used in a roller compactor, then the container capacity is significantly increased compared to uncompacted waste, but torsional loads on the pendulum arm and pivot bearing become significant
Solution Approach 1:
The patent applies beforehand cushioning by introducing elastomeric stop elements between the coupling components that can compress elastically when torsional loads reach peak values. These stop elements are positioned in advance to absorb impact forces during direction reversal and single roller engagement, preventing direct metallic contact and reducing torsional stresses on the pendulum arm and pivot bearing before damage can occur.
Solution Approach 2:
The elastomeric stop elements serve as intermediary elements between the two coupling components. Instead of allowing direct metallic-to-metallic contact that would generate high torsional loads, the elastomeric material acts as a mediator that compresses elastically under load, absorbing peak forces and transmitting reduced stresses through the coupling mechanism.
2Productivity
If the roller rotates to redistribute waste layers, then compaction efficiency is improved, but peak torsional loads occur during direction reversal
Solution Approach 1:
The elastomeric stop elements are pre-positioned between the coupling components to cushion peak torsional loads that occur during roller direction reversal. When the roller changes direction, the elastomeric material compresses elastically, absorbing the impact force and preventing direct metallic contact that would generate damaging peak loads.
Solution Approach 2:
The patent changes the mechanical parameter of the coupling connection by introducing elastomeric elements that alter the force transmission characteristics. The elastomeric material provides non-linear stiffness, allowing free rotation during normal operation but compressing elastically under peak torsional loads to absorb impact forces.
3Device complexity
If direct contact between coupling elements is used, then structural simplicity is maintained, but metallic contact causes high torsional stress and wear
Solution Approach 1:
The elastomeric stop elements serve as intermediary components between the metallic coupling surfaces. Instead of direct metallic-to-metallic contact that causes wear and high torsional stress, the elastomeric material mediates the contact, providing cushioning and reducing the transmission of peak loads while maintaining the overall simplicity of the coupling structure.
Solution Approach 2:
The coupling mechanism transitions from a homogeneous metallic structure to a composite structure combining metallic coupling components with elastomeric stop elements. This composite approach leverages the rigidity of metal for structural integrity while utilizing the shock-absorbing properties of elastomeric material to reduce wear and torsional stress.
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
The torsional compensation coupling effectively mitigates torsional loads, ensuring smooth operation and reducing wear on the pendulum arm and its bearings, while maintaining compaction efficiency.
Implementation Method 1
the elastomeric contact element is compressed and elastically deformed. This phase, in particular, serves to absorb peak loads
Data Source
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AI summary
Pendulum arm for a roller compactor for compacting waste materials, comprising at least: - a pivot joint arranged at an upper end for freely pivoting connection of the pendulum arm to a support arm of the roller compactor;- a roller unit arranged on a gear holder element at a lower end of the pendulum arm and having at least two rotatable roller bodies arranged on both sides of the gear holder element, characterized in that at least one torsional compensation coupling (40) is arranged at the end of the pendulum arm or within the pendulum arm, comprising at least two coupling element components (41, 42) that can be coupled to one another and that are pivotable relative to each other about at least one axis of compensation, - that the coupling element components (41, 42) have stop surfaces in both possible pivot directions about the axis of compensation with which they can be supported relative to each other, and that at least one elastomeric stop element (45) is inserted between the contacting stop surfaces of the coupling element components (41, 42).