Movable Pusher Bells for Tire Sidewall Bonding
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Solution Overview
Problem
Conventional tire manufacturing methods face inaccuracies and stress on the crowning drum due to force imbalances during the turning up and bonding of sidewalls, which can deform the tire and overburden the mechanics.
Innovation Solution
The method involves using inflatable crowning bellows and movable pusher bells on a rail system, with drives and a servomotor to maintain even contact pressure and compensate for force imbalances, ensuring accurate and balanced bonding of sidewalls to the tire carcass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pusher bells are used on the crowning drum, then the sidewalls can be turned up and bonded to the tire carcass, but force imbalances occur during the process causing manufacturing inaccuracies and deformation
Solution Approach 1:
The invention replaces the conventional fixed pusher bells with dynamically adjustable pusher bells that can independently move in the axial direction. This dynamic capability allows the system to compensate for force imbalances during the turning up process, ensuring even contact pressure and preventing tire deformation while maintaining manufacturing precision.
Solution Approach 2:
The invention incorporates sensors that detect the position and force distribution during the turning up process. This feedback information is used to control the axial movement of the pusher bells, enabling real-time compensation for force imbalances and ensuring consistent bonding quality.
2Device complexity
If conventional fixed pusher bells are used, then the structure is simpler, but the mechanics of the crowning head and drum are overloaded due to force imbalances
Solution Approach 1:
The invention introduces axially movable pusher bells with independent drive mechanisms. Although this increases device complexity, it distributes and balances the forces during the turning up process, preventing overloading of the crowning drum and head mechanics.
Solution Approach 2:
The invention changes the operational parameters of the pusher bells by enabling axial movement. This parameter change allows the system to adapt force distribution dynamically, reducing peak stresses on the crowning drum while maintaining effective sidewall bonding.
3Ease of manufacture
If conventional manufacturing process is used, then the process is simpler, but aging of bellows causes force imbalance and deformation
Solution Approach 1:
The invention uses sensors to continuously monitor the force distribution and position of the pusher bells during the turning up process. This feedback mechanism compensates for aging effects in the bellows by dynamically adjusting the axial positions of the pusher bells, maintaining uniform bonding quality throughout the tire's service life.
Solution Approach 2:
The invention enables the system to self-correct force imbalances through the axially movable pusher bells. When one side experiences greater resistance or force imbalance, the system automatically adjusts the position of the pusher bells to maintain even contact pressure, eliminating the need for external intervention.
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 approach significantly improves manufacturing quality by ensuring even contact pressure and reducing mechanical stress, allowing for precise and uniform bonding of sidewalls, thereby enhancing tire production quality.
Implementation Method 1
turning up the side walls arranged on the tire carcass with inflatable crowning bellows
Implementation Method 2
lateral pressing of the pusher bells against the buckling bellows, whereby the buckling bellows are deformed and the turned-up side walls are pressed against the outer sides of the bulged tire carcass
Data Source
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AI summary
The invention relates to a method for producing a vehicle tyre in which a tyre carcass is expanded radially on a shaping drum, wherein the sidewalls (11, 12) arranged on the tyre carcass (8) are turned up by inflatable shaping bladders (5, 6). This involves moving two pusher bells (1, 2), which are arranged to the sides of the tyre carcass (8), in the direction of the centre (15) of the blank, wherein the pusher bells (1, 2) are respectively mounted on a movable first and second carriage (3, 4) and are respectively moved in the axial direction (20) by a first and second drive (13, 14) by way of a coupling, wherein the pusher bells (1, 2) are pressed laterally against the shaping bladders (5, 6). When a disequilibrium of forces on the two sides of the shaping bladders (5, 6) is set, the pressing positions of the two pusher bells (1, 2) are balanced, the two drives (13, 14) being arranged on a freely mounted third carriage (17).