Adjustable Bead Breaking Unit for Tyre Changing Machines
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Solution Overview
Problem
Existing bead breaking units for tire changing machines have limitations in accommodating different tire sizes and types, leading to potential tire damage and complicating the positioning process due to a fixed stroke of the blade and the need for manual adjustment during wheel rotation.
Innovation Solution
A bead breaking unit with an adjustable blade position, facilitated by a rotatable arm and a linear actuator, allows for customizable blade placement relative to the tire, enabling optimal positioning and stroke adjustment based on tire size, thus preventing damage and simplifying the positioning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed stroke actuator is used, then the device structure is simple, but the blade penetration depth cannot be adjusted for different tire sizes, causing excessive insertion and tire damage
Solution Approach 1:
The actuator stroke is made adjustable through a mechanical linkage system with movable connection points. The linkage allows the actuator stroke to be dynamically adapted to different tire widths by changing the effective lever arm length, enabling the same actuator to provide appropriate blade penetration depth for various tire sizes without excessive insertion
Solution Approach 2:
The mechanical linkage system enables change in the effective actuator stroke parameter based on tire width. By adjusting the connection point position on the movable arm, the system varies the stroke transmission ratio, transforming the fixed actuator stroke into an adjustable effective stroke that matches different tire dimensions
2Ease of operation
If the blade returns close to the wheel after bead breaking, then the return spring mechanism is simple, but the operator must manually position the wheel while avoiding the blade, complicating the operation
Solution Approach 1:
The mechanical linkage system automatically positions the blade at an optimal distance from the wheel before the bead breaking operation begins. This preliminary positioning is achieved through the geometry of the linkage, which places the blade in readiness position without requiring manual intervention, allowing the operator to safely position the wheel without concern for blade interference
Solution Approach 2:
The linkage mechanism automatically manages blade positioning and retraction throughout the operation cycle. After bead breaking, the linkage geometry naturally returns the blade to a safe position relative to the wheel without requiring additional actuators or complex control systems, enabling the operator to proceed with wheel rotation without manual blade repositioning
3Adaptability or versatility
If a longer actuator stroke is used to accommodate wide tires, then all tires can be broken, but narrow tires suffer from excessive blade penetration and damage
Solution Approach 1:
The mechanical linkage transforms the actuator's linear motion into rotational motion of the movable arm with variable leverage. For wide tires, the linkage geometry provides a mechanical advantage that extends the effective blade travel distance without increasing actuator stroke. For narrow tires, the same linkage reduces the effective travel, preventing excessive penetration while maintaining full actuator capability
Solution Approach 2:
The linkage system changes the effective stroke parameter based on the selected tire width. By adjusting the connection point position or linkage configuration, the system varies the stroke transmission ratio, enabling the same actuator to provide appropriate blade penetration depth for both narrow and wide tires without causing damage to either
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 adjustable bead breaking unit effectively prevents tire damage by optimizing blade placement and stroke for various tire sizes, simplifying the positioning operation, and allowing efficient bead breaking of different tires without excessive blade insertion.
Implementation Method 1
the arm, which can be freely rotated around its hinging axis, is in a closer position with respect to the bed of the tyre changing machine due to the action of one or more return springs
Implementation Method 2
a linear actuator of the type, e.g., of a fluid actuator cylinder for moving the arm
Implementation Method 3
This locator element has a vertical support surface, otherwise known as pad, which is made of suitable material, and usually knurled in such a way as to increase the friction coefficient with the wheel
Data Source
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AI summary
The bead breaking unit (1) for tyre changing machines (A) comprises one arm (2) associated rotatable with a supporting structure (3), a bead breaking tool (4) associated with the arm (2) and movement means (5) associated with the arm (2) and suitable for moving the arm (2) from a disengagement position, wherein the bead breaking tool (4) is substantially moved away from the tyre (B) of a wheel (D) to undergo bead breaking, to an operating position, wherein the bead breaking tool (4) is engaged on the tyre (B). The arm (2) comprises adjustment means (9) for adjusting the position of the bead breaking tool (4) along a near/away direction to/from the wheel (D), suitable for adjusting the position of the bead breaking tool (4) when the arm (2) is in the disengagement position, depending on the sizes and/or type of the wheel (D).