Tyre Bead Breaker Cushioning for Controlled Rim and Tyre Release
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Solution Overview
Problem
Existing tire changing machines are inefficient and prone to damage during the bead breaking process, as operators struggle to control the bead breaker tool, leading to unpredictable bead release and increased operation time, especially when handling wheels of varying sizes.
Innovation Solution
A tire changing machine with a bead breaker unit featuring a rotatable bead breaker tool and adjustable actuator, coupled with a ergonomic driving element that allows precise control and intermediate positioning, enabling efficient bead breaking without excessive movement, and a lifting device for easy wheel handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the bead breaker tool is moved quickly to break the tyre bead, then the bead breaking speed is improved, but the risk of uncontrolled movement and damage to the tyre or rim increases
Solution Approach 1:
The patent employs a pneumatic cushioning system that provides progressive resistance during the bead breaking stroke. The cushioning chamber with adjustable pre-compression allows the system to absorb excess energy and prevent uncontrolled movement when the bead breaks, while still permitting high-speed operation. The cushioning force activates only when needed, providing automatic control without requiring manual intervention.
2Ease of operation
If the control lever is used to operate the pneumatic circuit, then the pedal control inconvenience is resolved, but the control precision and operator safety decrease
Solution Approach 1:
The system uses a self-regulating pneumatic cushioning mechanism that automatically controls the bead breaking process. The cushioning chamber with adjustable pre-compression self-adjusts the resistance based on the actual bead breaking conditions, eliminating the need for manual control intervention while maintaining safety and precision throughout the operation.
3Adaptability or versatility
If the arm is moved back to the end-of-stroke position after each bead breaking, then the machine is ready for the next wheel, but the operation time increases for narrower wheels
Solution Approach 1:
The patent implements a dynamic stop position system where the bead breaking arm can be positioned and held at any point along its stroke range using the adjustable cushioning mechanism. For narrower wheels, the arm stops at an intermediate position after breaking the bead, eliminating the need to return to the full end-of-stroke position. The system adapts the movement range to match the actual wheel dimensions, optimizing productivity while maintaining versatility.
4Force
If the bead breaker tool applies high force to detach the bead, then the bead breaking effectiveness is improved, but the risk of sudden bead release and uncontrolled arm movement increases
Solution Approach 1:
The pneumatic cushioning system is pre-configured with adjustable pre-compression that creates a progressive resistance curve throughout the bead breaking stroke. This cushioning force builds up beforehand and activates automatically when the bead releases, preventing uncontrolled arm movement while still permitting high breaking forces to be applied. The system maintains operator control by providing predictable, progressive resistance rather than sudden force changes.
Data Source
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.