Title: Multi-chambered tyre with or without pressure-loss sensor and the manufacturing process for the same.

Field of Invention: This invention relates to "Multi-chambered tyre with or without pressure-loss sensor and the manufacturing process for the same"; more particularly to multiple chambers adjacent to the crown area of the tyre, fluid inlet and outlet system and manufacturing process for the same. Background:

The present tyre systems available with the users have a tire fitted to the wheel with a valve to facilitate pressurised air or any other pressurised fluid like nitrogen to get inside the tyre. The valve facilitates to evacuate the same pressurised fluid from the tyre in case of need. When a tubeless-tyre gets a puncture due to a nail or any other foreign material, a valve like structure is formed in the surface and the pressurised fluid escapes out, which makes the tyre flat. The same failure occurs in case of tyre-tube arrangement as well, because the valve like structure is formed in the tube.

To restrict the pressurised fluid from escaping in case of puncture sealing liquid or powder is kept inside the cavity of tyre / tube in the existing technology. However the sealing substance can seal only very small holes made due to the foreign object. Usually the sealant can seal a hole of 3/16 inch size and not more than that. Yet again, the existing sealing substance is not only expensive but also decreases the life of the tyre or tube as the case may be and needs replacement within few months adding more cost to it. Prior art teaches about a multi-chambered tyre which is provided by a pneumatic outer tyre and an inner tyre mounted upon a rim of wheel. There is a gap between inner tyre and outer tyre. When tyre gets punctured the air in- between the inner tyre and outer tyre escapes, and the inner tyre touches the inner surface of the outer tyre, and the air pressure decreases to almost half in the punctured tyre. This decrease in pressure causes instability of the vehicle and increases the chances of overturning. Again large difference in pressure between tyres decreases the life of all tyres. If the nail is large then there is a possibility of puncture of the inner tyre as well.

In case of all run flat technology, the tyres are to be provided with sensors to sense accidental pressure loss. The existing accidental pressure loss sensor is fitted to the rim and is expensive. While engaging and disengaging the tyre to the rim said sensor are most likely to be damaged. Hence these sensor based tyres require expertise in engaging and disengaging of it. Objective:

Object of this invention is to obviate the above drawbacks of tyre by providing a "Multi-chambered tyre with or without pressure-loss sensor and the manufacturing process for the same" for vehicles. Summary of Invention :

To achieve the said objective this invention provides "Multi-chambered tyre with or without pressure-loss sensor and the manufacturing process for the same" for vehicles comprising:

- an inner tyre and an outer tyre, - wherein at least one chamber adjacent to the crown portion of the outer tyre having a separate no-return inlet valve (one way valve) in the inner part of each chamber to provide pressurized fluid to enter inside the chamber.

The chambers are made up of thin, flexible material having property similar to rubber material and hard material, nylon, rayon carbon black are provided in the edges of the chambers for directional stability.

Side walls of the chambers are parallel to each other /parallel to each other and equidistance from each other/ parallel to each other along axial direction/parallel to each other along circumferential direction/parallel to each other along circumferential and axial direction /at a certain angle to each other along axial direction or along circumferential direction or along both axial and circumferential direction.

The chambers are of different shapes such as cube/ cuboidal/ rectangular parallelo-piped/ trapezoidal/ triangular prism/ hexagonal prism/ pentagonal prism/ octagonal prism/ cylindrical or fructum of a pyramid.

The chambers are joined to the inner wall of the outer tyre; in such a manner that in case of puncture, only pressurized fluid of one chamber escapes, other chambers remain almost unaffected.

No-return inlet valve (one-way valve) joined to inner part of each chamber. A lower patch on the outer surface of the inner tyre and a upper patch below the surface of the chambers corresponding to said lower patch, so that when accidental pressure loss occurs the lower patch and the upper patch touches each other to complete the circuit and generate signal to warn the driver about the accidental pressure loss on the corresponding tyre. The lower patch and the upper patch are made up either of electricity conducting material or of piezoelectric material. The manufacturing process for the same comprises following processes:

- rolling flexible sheet material having property similar to rubber material along with the additives like nylon, rayon and carbon black to keep the chambers in desired shape in normal and punctured condition;

- cutting and trimming the rolled flexible sheet material to the dimension;

- piercing and joining the no-return inlet valves to the flexible sheet material in such a manner that the pressurised fluid can enter into the chambers and cannot come out; - joining the said cut, trimmed and pierced rolled flexible sheet material in the inner side of the outer tyre by the help of adhesives and vulcanising for better joining.

The manufacturing process for the same comprises following step: the lower patch is joined to the outer surface of the inner tyre and the upper patch is joined below the surface of the chambers corresponding to the lower patch.

Brief Description :

The invention will now be described with reference to accompanying drawings:

Fig.l shows front cross-sectional view of the "Multi-chambered tyre without pressure-loss sensor" with single chamber for vehicles according to this invention.

Fig.2 shows front cross-sectional front view of the "Multi-chambered tyre without pressure-loss sensor" with multiple chambers for vehicles according to this invention.

Fig.3 shows front cross-sectional view of the "Multi-chambered tyre with pressure-loss sensor" with single chamber for vehicles according to this invention.

Fig.4 shows front cross-sectional view of the "Multi-chambered tyre with pressure-loss sensor" with multiple chambers for vehicles according to this invention. Fig.5 shows side cross-sectional view of the "Multi-chambered tyre with/ without pressure-loss sensor" with multiple chambers for vehicles according to this invention.

Fig.6 shows side cross-sectional view of the "Multi-chambered tyre with/ without pressure-loss sensor" for vehicles according to this invention. Fig.7 shows front view of the arrangement of chambers in a "Multi-chambered tyre with/ without pressure-loss sensor" with multiple chambers for vehicles according to this invention.

Fig.8 shows front view of the arrangement of chambers in a "Multi-chambered tyre with/ without pressure-loss sensor" with multiple chambers for vehicles according to this invention.

F3g.9 shows front view of the arrangement of chambers in a "Multi-chambered tyre with/ without pressure-loss sensor" with multiple chambers for vehicles according to this invention.

Fig.10 shows front view of the arrangement of chambers in a "Multi- chambered tyre with/ without pressure-loss sensor" with multiple chambers for vehicles according to this invention.

Detailed Description:

Referring to the drawings, Improved multi-chambered tyre with pressure loss sensor and the manufacturing process for the same for vehicles comprising an inner tyre(2) and an outer tyre(l) are mounted upon a rim of wheel(3). In between the gap of outer tyre and inner tyre there is at least one chamber (8) adjacent to the crown portion of the outer tyre (1). The chambers are joined to

the inner part of the outer tyre (1). Preferably the joining is done by the help of adhesives and then vulcanized. Each chamber (8) has a no-return inlet valve (9) in flexible sheet material (7) to provide pressurized fluid to enter inside the chamber (8). The no-return inlet valve (9) is provided below the surface of the chamber (8), so that said valve will allow the pressurised fluid available in the gap of chambers and inner tyre (2) to enter into said chambers (8) and do not allow any pressurised fluid to come out from the chamber to said gap in case of any pressure difference. The chambers are made up of thin, flexible sheet material having property similar to rubber material. In the edges of the chambers (8) hard material like nylon, rayon and carbon black are preferably provided in flexible sheet material (7) for directional stability. The chambers (8) are joined to the inner wall of the outer tyre (1); such that in case of puncture, only pressurized fluid of punctured chamber escapes, other chambers remain almost unaffected. After the puncture shape of the side walls (10) of the chambers change. It results in overall change in shape of the punctured and unpunctured chambers, so as to accommodate the pressure loss and to avoid contact between piercing element and any part of said flexible sheet material (7). In a multi-chambered tyre with pressure loss sensor a lower patch (6) on the outer surface of the inner tyre (2) and a upper patch(5) below the surface of the chambers(8) on the flexible sheet material (7) corresponding to the lower patch (6) are coupled/joined. So that when accidental pressure loss occurs due to loss of pressurised fluid in one chamber and the gap, the inner tyre (2) expands and touches the flexible sheet material (7) and the lower patch (6) and the upper patch (5) touches each other to complete the circuit and generate signal to warn the driver about the accidental pressure loss on the corresponding tyre. The lower patch (6) and the upper patch (5) are made up either of electricity conducting material or of piezoelectric material. Direction along the axis of the rim of wheel (3) is the axial direction and direction along the circumference of the tyre (1, 2) is the circumferential direction. In one of its embodiment of the invention side walls (10) of the chambers (8) are along the circumference and perpendicular to the axial direction. In another embodiment of the invention

multiple chambers (8) are also formed along the circumference, so that side walls are perpendicular to circumferential direction and along the axial direction (fig. 6); or are at certain angle to the circumferential direction and the axial direction. In another embodiment of the invention multiple chambers are also formed along both the circumferential and axial direction or at any angle to said directions. The side walls (10) of the chambers are parallel to each other /parallel to each other and equidistance from each other/ parallel to each other along axial direction/parallel to each other along circumferential direction/parallel to each other along circumferential and axial direction /at a certain angle to each other along axial direction or along circumferential direction or along both axial and circumferential direction. The chambers (8) are of different shapes such as cube/ cuboidal/ rectangular parallelo-piped/ trapezoidal/ triangular prism/ hexagonal prism/ pentagonal prism/ octagonal prism/ cylindrical or fructum of a pyramid. The manufacturing process for the same comprises rolling of flexible sheet material (7) having property similar to rubber material along with the additives like nylon, rayon and carbon black to keep the chambers(8) in desired shape in normal and punctured condition. Then the rolled flexible sheet material (7) undergoes cutting and trimming process to achieve required dimension. The no-return inlet valves (9) are pierced and coupled/joined to the flexible sheet material in such a manner that the pressurised fluid can enter into the chambers and cannot come out of it. Said trimmed and rolled flexible sheet material (7) is joined in the inner side of the outer tyre (1) by the help of adhesives and then vulcanised for better joining. In a multi-chambered tyre with pressure loss sensor the lower patch (6 ^* ) is joined to the outer surface of the inner tyre(2) and the upper patch(5) is joined below the surface of the chambers corresponding to the lower patch.

In yet another embodiment a Multi-chambered tyre with or without pressure- loss sensor for vehicles comprising: an inner tyre and an outer tyre, wherein at least one chamber adjacent to the crown portion of the outer tyre having a separate no-return inlet valve (one way valve) in the inner part of each chamber to provide pressurized fluid to enter inside the chamber. The

chambers are made up of thin, flexible material having property similar to rubber material and hard material, nylon, rayon carbon black are provided in the edges of the chambers for directional stability. Side walls of the chambers are parallel to each other /parallel to each other and equidistance from each other/ parallel to each other along axial direction/parallel to each other along circumferential direction/parallel to each other along circumferential and axial direction /at a certain angle to each other along axial direction or along circumferential direction or along both axial and circumferential direction. The chambers are of different shapes such as cube/ cuboidal/ rectangular parallelo- piped/ trapezoidal/ triangular prism/ hexagonal prism/ pentagonal prism/ octagonal prism/ cylindrical or fhictum of a pyramid. The chambers are joined to the inner wall of the outer tyre; in such a manner that in case of puncture, only pressurized fluid of one chamber escapes, other chambers remain almost unaffected. No-return inlet valve (one-way valve) joined to inner part of each chamber. A lower patch on the outer surface of the inner tyre and a upper patch below the surface of the chambers corresponding to said lower patch, so that when accidental pressure loss occurs the lower patch and the upper patch touches each other to complete the circuit and generate signal to warn the driver about the accidental pressure loss on the corresponding tyre. The lower patch and the upper patch are made up either of electricity conducting material or of piezoelectric material. The manufacturing process for the same comprises following processes: rolling flexible sheet material having property similar to rubber material along with the additives like nylon, rayon and carbon black to keep the chambers in desired shape in normal and punctured condition; cutting and trimming the rolled flexible sheet material to the dimension; piercing and joining the no-return inlet valves to the flexible sheet material in such a manner that the pressurised fluid can enter into the chambers and cannot come < out; joining the said cut, trimmed and pierced rolled flexible sheet material in the inner side of the outer tyre by the help of adhesives and vulcanising for better joining. In an embodiment with pressure loss sensor the manufacturing process for the same comprises following step: the lower patch is joined to the

outer surface of the inner tyre and the upper patch is joined below the surface of the chambers corresponding to the lower patch.

In case of a puncture in the outer tyre (1), the air escapes from one of the chamber (8) and said chamber looses its shape and becomes punctured chamber. The valve of said punctured chamber being a no-return inlet valve(9) it allows the pressurised fluid in the gap to enter into said punctured chamber and escape out through the puncture. However, it does not cause any loss of pressurised fluid of other chambers. Correspondingly shape and pressure of said other chambers also change. The advantages over the existing products are as follows:

- Can be easily manufactured,

- Pressure loss is less as compared to existing technologies in case of puncture,

- Reliability is more, - Can be used in radial tyre, bias and bias-plyed tyre,

- Low cost of production and maintenance,

- Can be implemented in any tyre using pressurised fluid.

Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense.

Various modifications of the disclosed embodiments, as well as alternate embodiments of the invention, will become apparent to persons skilled in the art upon reference to the description of the invention. It is therefore contemplated that such modifications can be made without departing from the spirit or scope of the present invention as defined.