Pneumatic Tire Sound Absorber Weight Correction
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Solution Overview
Problem
The installation of a sensor unit in a pneumatic tire with a sound absorbing member bonded to the inner surface limits the installation position and degrades the tire balance, leading to issues with weight unbalance and potential damage.
Innovation Solution
A correction body is strategically placed on the tire inner surface to correct weight unbalance, positioned where the weight is lightest, and separated from the sound absorbing members to prevent contact and damage, with an adhesive layer ensuring effective adhesion and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a sensor unit is installed in a pneumatic tire with a sound absorbing member bonded to the inner surface, then tire internal information can be acquired, but the installation position is limited and the balance of the tire is degraded
Solution Approach 1:
The correction body is segmented from the sound absorbing member, allowing independent positioning. The correction body is placed at the light point while the sound absorbing member remains at the shoulder portion, resolving the conflict between sensor installation needs and tire balance requirements
Solution Approach 2:
The correction body acts as an intermediary element that compensates for the weight unbalance caused by the sound absorbing member. By positioning the correction body at the light point, it mediates the balance issue while allowing the sound absorbing member to remain in its optimal position for noise reduction
2Duration of action of stationary object
If multiple sound absorbing members are disposed on the tire inner surface to suppress heat accumulation, then high-speed durability is enhanced, but contact between sound absorbing members may cause damage
Solution Approach 1:
The sound absorbing members are segmented and positioned at opposite sides of the tire width direction, separated by at least 40% of the land portion width. This segmentation prevents contact between the members while maintaining their heat suppression function during high-speed rotation
Solution Approach 2:
The sound absorbing members are positioned in the tire width direction rather than being adjacent to each other. By utilizing the width dimension for separation, the members can both suppress heat accumulation at their respective positions without contacting each other during tire rotation
3Reliability
If the correction body is disposed between the sound absorbing members in the tire width direction, then damage to the correction body during rim mounting is reduced, but the adhesion area may be limited
Solution Approach 1:
The adhesion strength is enhanced by optimizing the adhesive layer parameters, including using a multi-layer adhesive structure with different properties. The first adhesive layer provides initial bonding while the second adhesive layer enhances overall adhesion strength, compensating for the limited adhesion area caused by the correction body's central positioning
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 effectively suppresses tire balance degradation, reduces damage, and enhances high-speed durability and noise performance by accurately acquiring tire information while maintaining adhesiveness and preventing peeling.
Implementation Method 1
an adhesive layer ensuring effective adhesion and durability
Implementation Method 2
a sound absorbing member having a band-like shape bonded to an inner surface of a tread portion
Data Source
AI summary
A pneumatic tire includes at least one sound absorbing member having a band-like shape. The sound absorbing member is bonded to an inner surface of a tread portion along a tire circumferential direction. A correction body for correcting weight unbalance is fixed to a tire inner surface in a range corresponding to a light point of an entire tire including the sound absorbing member.