Tyre Bead Breaker Arm Control for Variable Wheel Sizes
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Solution Overview
Problem
Existing tyre changing machines are inefficient, time-consuming, and prone to damage due to uncontrolled bead breaking operations, especially when handling wheels of varying sizes, and lack ergonomic control mechanisms.
Innovation Solution
A tyre changing machine with a bead breaker unit featuring a rotatable and adjustable bead breaker tool, driven by a ergonomic control handle, and a lifting device for efficient and controlled bead detachment, allowing adaptation to different wheel sizes without excessive movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bead breaker tool is driven by a pneumatic or hydraulic cylinder with pedal controls, then the bead breaking operation can be performed, but the operator has to press the pedals while holding the handgrip with one hand, which is inconvenient
Solution Approach 1:
The patent removes the foot pedal controls from the system and replaces them with a hand-operated control lever mounted on the arm. This extraction of the problematic pedal mechanism eliminates the need for coordinated foot-hand operation, resolving the ergonomic contradiction.
Solution Approach 2:
The control lever acts as an intermediary control element that provides mechanical advantage and precise control. It mediates between the operator's hand force and the cylinder's piston movement, offering better control than direct pedal operation while maintaining system simplicity.
2Device complexity
If the control lever simply opens and closes the pneumatic circuit to move the arm, then the control mechanism is simple, but the bead breaks free suddenly and all at once, making it difficult to stop the arm
Solution Approach 1:
The control lever is designed with a variable mechanical advantage ratio that changes during its stroke. As the lever moves toward the bead breaking position, the mechanical advantage increases, providing progressive force amplification. This dynamic characteristic allows smooth control of the bead breaking process and enables the operator to stop the arm at any point, preventing sudden uncontrolled breaking.
Solution Approach 2:
The control lever changes the flow rate parameter of the pneumatic circuit dynamically during operation. By varying the opening degree of the control valve progressively, it enables controlled movement of the bead breaker tool, allowing the operator to maintain precise control throughout the breaking process and stop whenever needed.
3Adaptability or versatility
If the arm is moved back to the end-of-stroke position after every bead detachment, then the machine can handle the next wheel, but time is lost even when narrower wheels could be positioned without moving the arm
Solution Approach 1:
The control lever is mounted on the arm itself, making it self-contained and independent of the machine's main frame position. This allows the operator to control the bead breaker tool's movement relative to the wheel regardless of the arm's position on the machine, enabling continuous operation with wheels of varying sizes without requiring the arm to return to a fixed end position.
Solution Approach 2:
The control lever serves multiple functions: it controls the bead breaking operation, allows positioning at intermediate stops, and adapts to different wheel sizes. This multi-functionality eliminates the need for separate mechanisms to handle different wheel configurations, maintaining both versatility and productivity.
Data Source
Figure 1
Figure 2A~2B
Figure 3A
AI summary
A tyre changing machine (100) for mounting and demounting a tyre (P) to and from a corresponding rim (C) of a vehicle wheel (R) comprises a wheel-holder unit (200), a frame (400) and a bead breaker unit (300) including an abutment surface (S) and a bead breaking arm (301) articulated to the frame (400) to rotate about a second vertical axis (Y). The bead breaker unit (300) comprises: a bead breaker tool (302) mounted on the bead breaking arm (301), a bead breaker actuator (303), connected to the bead breaking arm (301) to move the bead breaker tool (302) towards and away from the abutment surface (S), and a driving element (304), mounted on the bead breaking arm (301) and configured to drive the bead breaker actuator (303), the driving element (304) alternately adopting an advanced position, a return position and an intermediate position.