Tyre Changing Machine Bead Breaking Arm Ball Screw Drive
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Solution Overview
Problem
Traditional bead breaking assemblies in tyre changing machines, especially those with fluid-dynamic actuators, are uncomfortable and dangerous for operators due to unexpected bead detachment, and those without fluid-dynamic actuators suffer from incomplete automation and slow operation, along with mechanical jamming issues.
Innovation Solution
A tyre changing machine with a bead breaking arm that is horizontally oriented or slightly inclined, equipped with an electric motor-driven output shaft for precise control, and a drive transmission system using ball screws and pulleys for efficient and automated movement, allowing for safe and controlled bead breaking without the need for manual handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bead breaking assemblies with fluid-dynamic actuators are used, then the bead breaking operation can be performed, but the operator is exposed to unexpected bead detachment which is uncomfortable and dangerous
Solution Approach 1:
The patent replaces fluid-dynamic actuators (pneumatic or hydraulic) with an electric motor-driven mechanical system. The electric motor (10) activates a rod element (18) through a ball screw mechanism, which in turn moves the bead breaking arm (7). This substitution eliminates the unexpected and uncontrollable forces associated with fluid-dynamic actuators, providing precise control over the bead breaking process and eliminating the dangerous jolts to the operator's hand.
Solution Approach 2:
The patent incorporates a control system that monitors the bead breaking process and provides feedback to regulate the force applied. The electric motor is controlled to apply force progressively and controllably, preventing sudden bead detachment. The system allows the operator to control the force application through a control lever that regulates the motor's activation, ensuring safe and comfortable operation.
2Reliability
If bead breaking assemblies without fluid-dynamic actuators are used, then operator safety is improved, but the automation is incomplete and the operation is slow
Solution Approach 1:
The patent replaces manual mechanical operation with an electric motor-driven system. The electric motor (10) automatically activates the rod element (18) through the ball screw mechanism, which moves the bead breaking arm (7) towards and away from the wheel. This automation eliminates slow manual operation while maintaining precise force control, achieving both high speed and operator safety.
Solution Approach 2:
The patent employs a dynamic control system where the electric motor can adjust its output force and speed during the bead breaking operation. The motor activates the rod element to move the bead breaking arm progressively, allowing the system to adapt to the resistance encountered during debeading. This dynamic adjustment enables fast operation while maintaining safe, controlled force application throughout the process.
3Device complexity
If traditional mechanical bead breaking assemblies are used, then the structure is simple, but mechanical jamming issues occur
Solution Approach 1:
The patent replaces traditional mechanical linkages and actuators with an electric motor-driven ball screw mechanism. The ball screw converts rotational motion of the motor into precise linear motion of the rod element, eliminating complex mechanical linkages that are prone to jamming. This substitution maintains structural simplicity while significantly improving mechanical reliability by reducing the number of moving parts and potential failure points.
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
The solution provides a safe, controlled, and efficient bead breaking process, reducing operator risk and improving automation and speed, while maintaining ease of maintenance and reliability.
Implementation Method 1
The tyre changing machine according to the present invention further comprises means for transmitting drive from the motor device to the bead breaking arm... a rod element (18) having at least a first screw-shaped manoeuvring portion (18a)... a tubular body (22)... having a cavity which comprises at least a portion in the shape of a nut screw operatively coupled to the screw-shaped manoeuvring portion of the rod element
Implementation Method 2
The tyre changing machine according to the present invention comprises an electric motor (10), provided with an output drive shaft (10a) for moving the bead breaking arm (7) between a disengaged position and a working position and/or vice versa
Implementation Method 3
a pulley (21), mounted solidly to the tubular body (22), adapted to transmit the rotation of the tubular body (22) to the rod element (18)
Data Source
AI summary
A tyre changing machine includes a wheel support assembly for locking and setting in rotation a rim of a wheel from which to demount or on which to mount a tyre, and a bead breaking tool disposed at an end of a bead breaking arm and able to carry out the bead breaking operation. The bead breaking arm is movable between a disengaged position and a working position. A motor device has an output drive shaft for moving the bead breaking arm between the disengaged and working positions. Means for transmitting the drive from the motor device to the bead breaking arm include threaded means having an external screw-thread and hollow counter-threaded means operatively coupled with the threaded means. Connecting means operatively associate the means for transmitting the drive to the bead breaking arm.