Tire Mounting Lever Ball Joint Positioning for Operator Force Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tire mounting and demounting machines require significant operator force to maintain the pressure element on the tire bead or sidewall during the operation, which can lead to fatigue and increased risk of jamming or jolts when the wheel is rotated.
Innovation Solution
The machine design positions the first articulation point (C) in the first quadrant (Q1) and the second articulation point (E) in the first quadrant (U1), allowing the frictional force from the rotating tire to generate a centripetal force that reduces the external force needed to maintain the pressure element in its working position, thereby minimizing the force required on the lever and reducing the risk of jamming or jolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure element is positioned to maintain contact with the tire bead or sidewall during rotation, then the tire mounting/demounting operation can be performed, but significant operator force is required leading to fatigue and increased risk of jamming or jolts
Solution Approach 1:
The patent positions the first articulation point (C) in the first quadrant (Q1) or third quadrant (Q3) relative to the rotation axis (Y). This positioning creates a counterbalancing effect where the frictional force from the rotating tire generates a centripetal force that opposes the outward centrifugal force, thereby reducing the net force the operator must exert to maintain pressure element contact with the tire.
Solution Approach 2:
The patent changes the spatial parameters of the lever system by specifically positioning articulation points (C) and (E) in certain quadrants. This parameter change transforms the force dynamics during rotation, converting the frictional force into a beneficial centripetal component that reduces the required operator input force while maintaining operational reliability.
2Ease of operation
If the lever is positioned to exert pressure on the tire bead, then the bead can be maintained in the circumferential hollow of the rim, but the lever may jam against the rim or experience jolts during wheel rotation
Solution Approach 1:
The patent employs asymmetric positioning of the articulation points relative to the rotation axis. By placing point (C) in specific quadrants (Q1 or Q3) and point (E) in specific quadrants (U1 or U3), the lever system creates an asymmetric force distribution during rotation that prevents the pressure element from jamming against the rim while maintaining effective bead positioning capability.
Solution Approach 2:
The patent converts the potentially harmful frictional force between the rotating tire and pressure element into a beneficial centripetal force. By proper positioning of articulation points, the friction that would normally cause jamming or jolts is transformed into a force that helps maintain the pressure element in its working position, reducing the risk of operational failures.
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 configuration reduces the operator's effort needed to maintain the pressure element during tire mounting or demounting, minimizing the risk of jamming and jolts, allowing for smoother operation with reduced manual force exertion.
Implementation Method 1
the frictional force exerted by the tire on the pressure element, when the latter is in its working position (B) and when the tire is in rotation around the axis (Y), will result in a centripetal force on the pressure element
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The machine has a lever (12) including a spherical pressure element (13) for exerting pressure on a bead and/or a sidewall (5) of a tire (1) at a work point (B) of the tire. A ball joint (E) i.e. horizontal axis pivot, is articulated around a point for connecting or separating the pressure element from a central plane (PC) that is perpendicular to a vertical axis (Y). A tangential plane (PTA) is parallel to the axis and perpendicular to a radial plane (PR). The planes define four spatial quadrants (Q1-Q4). Another ball joint (C) i.e. vertical axis pivot, is found in the first/third quadrant.