Segmented Compensating Coupling for High-Speed Misalignment Damping
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Solution Overview
Problem
Existing compensating couplings face challenges in efficiently compensating for radial and axial offsets at high speeds, particularly in applications like spindle bearing test benches, where they often introduce imbalances and fail to provide adequate damping and thermal insulation.
Innovation Solution
A compensating coupling design featuring two outer coupling parts and a middle coupling part with a tubular damping element made of fiber-reinforced plastic, utilizing ball head centering and adhesive overload clutches for tool-free assembly and high-speed operation, with a design that minimizes parasitic unbalance and includes elastic rings for additional damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional compensating couplings are used to compensate radial and axial offsets, then misalignment compensation is achieved, but imbalances and parasitic unbalances are introduced at high speeds
Solution Approach 1:
The coupling is divided into three separate parts (first coupling part, second coupling part, and middle coupling part) that can be assembled independently. Each part can be individually balanced before assembly, preventing the introduction of new imbalances during assembly while maintaining misalignment compensation capability through the segmented structure with radial and axial play.
Solution Approach 2:
The middle coupling part features a specific geometric shape (circular arc profile) that provides both misalignment compensation and inherent balancing. The local geometric design of the middle coupling part with its curved profile allows it to compensate for offsets while its symmetry ensures minimal parasitic unbalance at high speeds.
2Manufacturing precision
If complex assembly procedures are used to ensure precise alignment, then assembly precision is improved, but assembly time and complexity increase
Solution Approach 1:
The coupling parts feature self-centering geometries where the middle coupling part automatically aligns with the outer coupling parts during assembly. The circular arc profile and radial play design enable the components to self-align without requiring complex external alignment tools or procedures, achieving precise assembly quickly and easily.
Solution Approach 2:
The coupling interface is designed with conical surfaces and complementary geometries that create a natural alignment path during assembly. The equipotential design of the mating surfaces ensures that the components settle into their correct relative positions automatically, eliminating the need for time-consuming alignment procedures.
3Strength
If rigid connections are used between coupling parts, then torsional rigidity is improved, but damping capability and thermal insulation are reduced
Solution Approach 1:
The coupling employs a composite design combining rigid outer coupling parts (made of metal materials like aluminum or steel) with a flexible middle coupling part (made of elastomeric or polymeric materials). This composite structure provides torsional rigidity through the rigid outer parts while the flexible middle section delivers vibration damping and thermal insulation, eliminating the need to choose between rigidity and damping.
4Strength
If heavy materials are used to increase structural strength, then strength and stiffness are improved, but mass and moment of inertia increase
Solution Approach 1:
The coupling uses a composite construction with lightweight outer coupling parts (preferably aluminum) and a flexible middle part (elastomeric or polymeric material). This composite approach achieves the required structural strength and torsional rigidity while keeping the overall mass and moment of inertia low, which is critical for high-speed applications.
Solution Approach 2:
The middle coupling part is designed as a flexible element with a specific geometric profile (circular arc) that provides the necessary mechanical strength for torque transmission while maintaining flexibility for damping functions. The thin-walled flexible structure achieves high strength-to-weight ratio, reducing mass and moment of inertia compared to traditional rigid thick-walled designs.
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 simple assembly and disassembly, balances individual components without introducing new imbalances, provides high damping and thermal decoupling, and maintains low mass and moment of inertia, effectively compensating for both radial and axial offsets even at high speeds without introducing load peaks.
Implementation Method 1
The middle coupling part (4) is formed from a tube section (7) designed as a damping element
Implementation Method 2
provides high damping and thermal decoupling
Data Source
Figure 1
Figure 2
AI summary
A compensating coupling comprises two outer coupling parts (2, 3), namely an input-side coupling part (2) and an output-side coupling part (3), both of which are to be connected to rotatable elements, more particularly shafts, and a center coupling part (4), which can be moved to a limited extent relative to the outer coupling parts (2, 3). The center coupling part (4) is composed of: - a tube piece in the form of a damping element (7); and - two tube end pieces (9, 10), which are fastened to the tube piece (7) and which are each designed to be fitted onto one of the outer coupling parts (2, 3) in a centered manner by means of ball head centering.