Tire Building Drum Elastic Sleeve with Axial Reinforcement
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Solution Overview
Problem
Existing tire building drums face issues with uncontrolled motion and friction during the expansion and contraction of the rolling bladder, leading to inaccurate rolling motion, potential entanglement with other components, and uneven deformations of tire components.
Innovation Solution
A tire building drum with turn-up arms and an elastic annular sleeve that expands and contracts with the arms, featuring inelastic reinforcement elements to prevent elongation and reduce friction, allowing the sleeve to move freely over the arms without surplus length, ensuring accurate and controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a rolling bladder with surplus length is used to accommodate diameter expansion, then the bladder can expand sufficiently, but the motion becomes uncontrolled and inaccurate
Solution Approach 1:
The patent changes the elasticity parameter of the bladder by incorporating reinforcement inserts that extend in the axial direction. These inserts make the bladder inelastic in the axial direction while maintaining elasticity in the circumferential direction, thereby controlling the expansion motion and improving accuracy without sacrificing the necessary expansion capability.
2Length of moving object
If a rolling bladder with surplus length is used, then expansion capacity is sufficient, but the bladder may become entangled with other components
Solution Approach 1:
The reinforcement inserts transform the bladder from a fully elastic structure to a hybrid structure that is elastic circumferentially but inelastic axially. This parameter change prevents the surplus length from moving uncontrollably during expansion and contraction, thereby eliminating the entanglement risk while maintaining sufficient expansion capacity.
3Manufacturing precision
If a multidirectionally deformable sleeve is used, then even deformation of carcass members is intended, but friction causes unpredictable shifting and uneven deformations
Solution Approach 1:
The patent applies reinforcement inserts to the sleeve structure, changing its deformation characteristics. The sleeve becomes inelastic in the axial direction (where reinforcement inserts are located) while remaining elastic in the circumferential direction. This selective parameter change eliminates friction-induced shifting in the axial direction while maintaining the necessary circumferential deformation capability for uniform carcass member shaping.
4Length of moving object
If surplus length of the rolling bladder is provided, then expansion accommodation is sufficient, but space is consumed that cannot be used for other components
Solution Approach 1:
The reinforcement inserts enable the bladder to achieve sufficient expansion capacity without requiring excess length. By making the bladder inelastic axially through the inserts, the design eliminates the need for surplus length while maintaining adequate expansion capability, thereby reducing space consumption and allowing better utilization of the tire building apparatus volume.
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 enhances the accuracy and compactness of the tire building drum, reducing friction and unpredictable shifting of tire components, while preventing entanglement with other components, resulting in more uniform and controlled tire component shaping.
Implementation Method 1
the sleeve is elastic in the circumferential direction and fits elastically around the turn-up arms
Implementation Method 2
the sleeve is provided with inelastic reinforcement elements extending in a reinforcement direction parallel to the longitudinal direction of the turn-up arms
Implementation Method 3
the reinforcement elements can prevent elongation of the sleeve in said longitudinal direction, thereby reducing friction between the sleeve and the tire components during turning-up
Data Source
AI summary
Provided is a tire building drum and a method for shaping tire components on the tire building drum, wherein the tire building drum has an annular sleeve that extends over turn-up arms in the longitudinal direction of the turn-up arms. The sleeve is elastic in the circumferential direction and fits elastically around the turn-up arms. The sleeve is provided with inelastic reinforcement elements extending in at least a part of the sleeve in a reinforcement direction transverse to the circumferential direction of the tire building drum, and has a fixed end that is retained in the axial direction and a movable end that is movable over the turn-up arms in their respective longitudinal directions.