Drum Ring Gear Assembly Friction Connection
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Solution Overview
Problem
Conventional drum/ring gear assemblies for winches with geared transmission require complex machining and assembly processes, leading to increased production costs and radial space occupation, while also compromising mechanical strength and chemical-physical properties for marine environments.
Innovation Solution
A drum/ring gear assembly with a direct or positive friction connection using grooved or contoured profiles that allow for integral rotation without the need for threaded elements, enabling assembly through deformation or interference fit, thus simplifying manufacturing and assembly while maintaining mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If threaded connecting elements are used to assemble the drum and ring gear, then the components can be made separately with suitable materials, but the machining complexity and assembly complexity increase
Solution Approach 1:
The connecting means are integrated directly into the drum structure, merging the connection function with the drum body. This eliminates the need for separate threaded holes and connecting elements, thereby reducing machining complexity while maintaining the ability to assemble separate drum and ring gear components made of suitable materials.
2Ease of operation
If threaded connecting elements are used to connect the drum and ring gear, then the components can be assembled, but the radial space occupation increases
Solution Approach 1:
The connecting means are incorporated within the drum's internal structure rather than extending radially outward. This integration allows the connection function to be achieved without increasing the radial dimensions of the ring gear, thereby maintaining compact overall size while enabling assembly of separate components.
3Strength
If the ring gear is made thicker to ensure mechanical strength, then the strength is improved, but the radial space occupation increases and the structure is weakened by holes
Solution Approach 1:
The connection function is extracted from the ring gear structure and transferred to the drum structure. This eliminates the need for threaded holes in the ring gear, preserving its structural integrity and allowing it to be made thinner without compromising strength, thereby reducing radial space occupation.
4Ease of operation
If conventional threaded connection system is used, then the drum and ring gear can be assembled, but the production costs increase and manufacturing efficiency decreases
Solution Approach 1:
The connecting means are merged into the drum structure as an integral feature rather than being separate components. This reduces the number of parts and assembly steps, eliminating the need for separate threaded elements and their associated machining operations, thereby improving manufacturing efficiency and reducing production costs while maintaining assembly functionality.
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 solution reduces production costs and radial space occupation, enhances mechanical strength, and simplifies the manufacturing and assembly processes, ensuring efficient and reliable operation of winches with geared transmission.
Implementation Method 1
connecting means, of the positive and/or direct friction type... a first grooved, or toothed, profile (6) associated with the external surface of the ring gear (3) and a second grooved, or toothed, profile (7), substantially matching up with the first profile and associated with the internal surface of the drum (2), which are mutually coupled so as to be integral in rotation
Data Source
AI summary
A drum and ring gear assembly for winches with geared transmission which comprises a substantially cylindrical drum adapted to be actuated rotationally about its own longitudinal axis and a ring gear accommodated substantially coaxially inside the drum, which are mutually associated so as to rotate integrally about the longitudinal axis by virtue of connecting means; the connecting means is of the positive and/or direct friction type.