Large-Wheel Tyre Changer With Dual Bead-Breaking Assemblies
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tyre changing machines for large wheels face difficulties in efficiently removing the tyre from the rim, particularly due to high friction between the first bead and the rim, which can hinder the removal process and potentially damage the tyre.
Innovation Solution
The tyre changing machine is designed with a first bead-breaking assembly positioned at the upper half of the wheel and a second bead-breaking assembly positioned at the lower half, allowing for reduced friction and easier removal of the first bead by positioning the second bead-breaking assembly in a slot formed by the first bead and the rim.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a first bead-breaking tool exerts a thrust on the first bead along a substantially horizontal direction to detach it from the rim flange, then the tyre bead can be detached from the rim, but the bead may come to a stop on the second flange which hinders removal and may damage the tyre
Solution Approach 1:
The invention introduces a second bead-breaking assembly positioned at the lower half of the wheel, operating in a different spatial dimension (vertical direction) compared to the first bead-breaking assembly (horizontal direction). This dimensional change allows the second assembly to push the first bead from below, preventing it from stopping on the second flange and enabling continuous removal without damage.
2Productivity
If the second bead-breaking assembly is positioned to operate on the second bead, then both beads can be detached, but the assembly becomes cumbersome and interferes with operators' work
Solution Approach 1:
The invention merges the functions of two bead-breaking assemblies into a single integrated structure where the second bead-breaking assembly is positioned to operate on the second bead while simultaneously supporting the first bead-breaking assembly. This combining reduces overall structural complexity and eliminates interference with operators' work space.
3Productivity
If the first bead-breaking tool exerts force to remove the first bead from the rim, then the tyre can be detached, but high friction between the bead and rim hinders the removal process
Solution Approach 1:
The second bead-breaking assembly acts as an intermediary that pushes the first bead from below, reducing the friction between the bead and the rim flange. This intermediary action facilitates easier detachment by minimizing the resistance force that the first bead-breaking assembly must overcome.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The tyre changing machine (1), particularly for large wheels, comprises: - a holding frame (13) on the ground; - gripping and rotational means (16) associated with the holding frame (13), adapted to grip a wheel (4), provided with a rim (3) and with a tyre (2), the rim (3) comprising a first flange element (5) and a second flange element (6) and the tyre (2) comprising a first sidewall (9), provided with a first bead (11), and a second sidewall (10), provided with a second bead (12); lifting/lowering means (23) of the gripping and rotational means (16); a first bead-breaking assembly (27) adapted to break the first bead (11) and a second bead-breaking assembly (34) adapted to break the second bead (12).