Tyre Changer Operating Arm for Low-Stress Bead Removal
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Solution Overview
Problem
Current tyre changing machines experience significant stress on tools and tyre beads during removal operations, leading to increased wear and reduced tool life, and require cumbersome and expensive drive mechanisms for both removal and mounting processes.
Innovation Solution
A tyre changing machine with an operating arm featuring a pivoted removal tool and a drive member articulated to the tool, allowing for precise roto-translational movement and reducing mechanical stress through a system of couplings and springs that enable efficient longitudinal and angular displacements, enabling both removal and fitting operations with reduced effort and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional demounting tool is used to extract the tyre bead from the rim, then the tyre removal operation can be performed, but significant stress is created on the tool and tyre bead leading to increased wear and reduced tool life
Solution Approach 1:
The patent applies dynamics by enabling the demounting tool to perform a roto-translational movement rather than a simple linear extraction. The tool rotates relative to the operating head towards a third angular position while simultaneously translating towards the main axis of the wheel-holder unit. This dynamic movement pattern reduces the stress concentration on the tool and tyre bead during the extracting step, thereby reducing wear and extending tool life while maintaining tyre removal capability.
2Ease of operation
If a drive system is used to move the demounting tool to the locating position, then the tool can grip the tyre bead, but the mechanical components are subjected to considerable stress during operation
Solution Approach 1:
The drive system is designed to enable the demounting tool to perform a roto-translational movement that reduces stress on mechanical components. By rotating the tool relative to the operating head while translating it towards the main axis, the system achieves automatic tyre removal with reduced stress concentrations on drive mechanism components, thereby improving both ease of operation and mechanical component durability.
3Reliability
If the demounting tool is made to perform a roto-translational movement to a third angular position, then stress on the tool and tyre bead is reduced, but the precision of the movement needs improvement
Solution Approach 1:
The patent incorporates feedback mechanisms to improve the precision of the roto-translational movement. By monitoring the position and movement of the demounting tool during its rotation and translation, the system can adjust and correct deviations from the desired trajectory, ensuring that the tool reaches the third angular position with the required precision while maintaining the stress-reducing benefits of the roto-translational movement.
Data Source
AI summary
A tyre changing machine (1), configured to remove a tyre from a respective rim of a vehicle wheel (2), comprises an operating arm (4) which includes: a supporting structure (401); a head (5) movable along a longitudinal axis (402) relative to the supporting structure (401); a removal tool (403) pivoted to the head (5) to rotate relative thereto about an axis of oscillation (405′) transverse to the longitudinal axis (402); a driving member (6) movable along an operating axis (402′) parallel to the longitudinal axis (402) relative to the supporting structure (401) and to the head (5), and articulated to the removal tool (403) at an operating point (P) which is spaced from the axis of oscillation (405′); an actuator (407) comprising a stationary member (407a), connected to the supporting structure (401), and a movable member (407b), adapted to drive the removal tool (403) in rotation and in translation; a coupling member (7) coupled to the supporting structure (401), to the head (5) and to the driving member (6). The movable member (407b) of the actuator (407) is connected to the driving member (6) to directly drive it along the operating axis (402′).