Variable Diameter Assembly Drum with Movable Elastic Grooves
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Solution Overview
Problem
The existing assembly drums for self-supporting tires face challenges in maintaining a stable laying surface during the assembly process, particularly when using elastic bodies, as they are prone to radial deformation due to laying tension, and require accurate adjustments for specific meridian profiles and axial distances, complicating the production of tires with varied dimensions.
Innovation Solution
An assembly drum with axially arranged circular grooves containing circumferential elastic bodies, where mechanical means move the elastic bodies to align with the drum's surface at different diameters, using incompressible materials to control the external profile and prevent radial deformation, allowing for accurate alignment and air-free laying surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If elastic bodies are used in grooves to maintain a cylindrical laying surface, then the laying surface stability is improved, but the elastic bodies are compressed by laying tension causing radial deformation and modification of the laying diameter
Solution Approach 1:
The invention makes the elastic bodies movable relative to the groove bottom through a mechanical lifting means. The elastic bodies can dynamically adjust their position: remaining uncompressed at the first laying diameter to maintain accuracy, and being compressed at the second laying diameter to fill the groove depression. This dynamic capability resolves the contradiction between maintaining surface stability and preventing radial deformation.
Solution Approach 2:
The elastic bodies automatically perform their function of filling the groove depression when needed. When the drum is at the second laying diameter, the elastic bodies are compressed by the laying tension and automatically move to fill the depression, creating a cylindrical laying surface without requiring external intervention. This self-service mechanism eliminates the need for complex external control systems.
2Adaptability or versatility
If the drum diameter is varied to accommodate different tire sizes, then the adaptability is improved, but the elastic bodies require accurate adjustment of elastic restoring forces for each specific profile
Solution Approach 1:
The invention introduces a mechanical lifting means that can actively adjust the position of elastic bodies relative to the groove bottom. This dynamic adjustment mechanism allows the same elastic bodies to be used across multiple drum diameters without requiring precise pre-adjustment of elastic restoring forces. The lifting means compensates for variations in required compression, simplifying the device while maintaining versatility.
Solution Approach 2:
The invention separates the function of maintaining elastic body position from the elastic restoring forces themselves. The mechanical lifting means handles the positioning and compression control, while the elastic bodies simply provide the filling function. This segmentation allows the elastic bodies to be standardized components that work across different drum configurations without requiring custom adjustment for each tire size.
3Shape
If elastic bodies are compressed to fill groove depression, then the cylindrical laying surface is restored, but the laying tension causes radial deformation and modifies the laying diameter
Solution Approach 1:
The mechanical lifting means provides dynamic control over the elastic bodies' compression state. At the first laying diameter, the elastic bodies remain uncompressed, preserving the drum's original cylindrical shape and laying diameter precision. At the second laying diameter, the lifting means compresses the elastic bodies to fill the groove depression and restore the cylindrical laying surface. This dynamic control eliminates the harmful radial deformation while maintaining the beneficial shape restoration.
Solution Approach 2:
The mechanical lifting means performs preliminary compression of the elastic bodies before the profiled elements are laid. By pre-compressing the elastic bodies to the desired position, the laying tension subsequently applied during assembly does not cause excessive radial deformation or modification of the laying diameter. The preliminary action prepares the elastic bodies to withstand the laying tension without compromising precision.
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
This solution ensures a stable and accurate laying surface across varying diameters, preventing air trapping and enabling precise control over the tire's dimensions, facilitating the production of self-supporting tires with consistent quality and varied designs.
Implementation Method 1
said grooves contain circumferential elastic bodies
Implementation Method 2
using incompressible materials to control the external profile and prevent radial deformation
Implementation Method 3
the effect of the laying tension of the profiled element of great thickness being applied to the receiving surface located axially in line with the elastic body is to compress said elastic body and to modify substantially the laying diameter
Data Source
AI summary
Assembly drum of variable diameter D, intended for the manufacture of a tire blank, the drum having a generally cylindrical laying surface (2) provided with circular grooves (3) arranged axially in a zone intended to receive profiled elements of great thickness, said groove (3) containing elastic circumferential bodies (4). When the drum D is moved to a first laying diameter, a mechanical means moves the elastic body (4) radially apart from the bottom of the groove, so as to align the radially outer surface of the elastic body (4) with the laying surface of the drum (2).