Segmented Sleeve Shaft Coupling for Bidirectional Torque
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Solution Overview
Problem
Existing coupling technologies for transferring torque between shafts are inadequate, particularly when shafts rotate in opposite directions, leading to potential disconnection and increased material costs, and are not suitable for precision applications where movement is limited.
Innovation Solution
A shaft connection assembly comprising a hub with an elongated annular sleeve and collar, featuring longitudinal slits that form sleeve segments, which apply a clamping force to prevent relative movement between shafts when rotated, eliminating the need for threaded shafts and duplicative assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threaded shafts and threaded couplings are used to connect two shafts, then the connection is effective for unidirectional rotation, but the shafts can fly apart if polarity is switched and material costs increase due to precise machining requirements
Solution Approach 1:
The sleeve is divided into multiple segments by longitudinal slits, allowing independent movement of each segment to clamp the shafts securely without requiring threaded connections
Solution Approach 2:
The coupling transitions from a static threaded structure to a dynamic segmented structure where the sleeve segments can move radially to accommodate shaft insertion and then clamp down to secure the connection
2Ease of operation
If fasteners or devices that draw shafts together are used, then the shafts can be connected, but relative movement of the shafts is required during the coupling process which is not possible in precision applications
Solution Approach 1:
The shafts are inserted into the hollow hub structure, with the segmented sleeve nested within the hub, allowing the shafts to be received and clamped without requiring external movement or adjustment
3Reliability
If two clamps fastened together with spacers are used, then the shafts can be connected, but material cost increases, maintenance difficulty increases, and the coupling diameter increases reducing application suitability
Solution Approach 1:
Two separate clamps are merged into a single segmented sleeve structure that performs the clamping function for both shafts simultaneously, reducing component count and simplifying the overall assembly
Solution Approach 2:
The single segmented sleeve performs multiple functions: it clamps both shafts, provides alignment, and enables torque transfer, eliminating the need for separate spacers and fastening mechanisms
4Ease of operation
If hydraulic clamps are used, then shafts can be connected, but hydraulic fluid creates additional operational and maintenance complexities
Solution Approach 1:
The segmented sleeve automatically clamps the shafts through its own structural design when the collar is positioned, eliminating the need for external hydraulic systems or specialized operating procedures
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 assembly securely connects shafts without requiring special tools or fluids, enabling torque transfer in any direction, reducing material costs, and is suitable for applications with limited space and precision requirements.
Implementation Method 1
the axial movement urges the sleeve segments radially inward to exert a clamping force, thereby clamping the first shaft to the second shaft by sleeve segments common to the first and second shafts. The clamping force exerted by the sleeve segments is sufficient to prevent relative movement of the first shaft with respect to the second shaft when the first and second shafts are rotated about a common axis.
Data Source
AI summary
A shaft connection assembly for the transfer of torque between two shafts is disclosed. The assembly includes a hub and an elongated annular collar. The hub includes a flange portion and a sleeve portion, the sleeve portion having a plurality of sleeve segments formed by longitudinal cuts along the length of the sleeve portion such that when the collar is forced linearly, axially away from the flange portion, the sleeve segments exert a clamping force on each of two shafts disposed within a passageway formed by the hub. The clamping force prevents relative movement of the first shaft with respect to the second when the shafts are rotated about a common axis. A method for joining two shafts for the transfer of torque using the shaft connection assembly is also disclosed.