New tire technology saving rubber tire made puncture free and live long

Wheel with outer rim

The new wheel assembly is a combination of a rim, tire and a hoop member that encircles outer periphery of the tire. The hoop member is a composite structure forming two rigid circular bands of metal spaced apart coaxially and restrained by a rigid bracing. The outer periphery of the hoop member is having a tread layer to be in contact with road surface while inner periphery of the hoop member accommodates outer circumference of the tire.

Accordingly, the rim, tire and hoop member are fitted coaxially around the hub such that the tire interposed between the rim and hoop member. The tire is inflatable and provides cushioning effect to the vehicle and its loads.
The rim accommodates a valve to pump pressurized air in to enclosed space between tire and rim. The tire may be consists a tube depending on the requirement and preference. The inner barrel of the hoop member will provide a firm grip with the tire outer circumferential surface, so that tire does not slip against the inner band of the hoop member. Only the tread profile on outer circumference is required to replace when it is worn out. Since inflated tire of the wheels situated above and away from the road surface, chances of damaging the tire due to road hazard is avoided.
The present invention is a wheel assembly and a method of making the wheel assembly for vehicles, carriages and other types of wheeled conveyances.

Inventor : Leelananda Jayasuriya

Patents Granted in Sri Lanka: Patent#16479

New tire technology

Problems met with conventional wheel assembly:

The tires are in direct contact with the road or ground. The flexible fabrication of tire is always liable to damage due to road unevenness and other hazard during mobility. Tire replacement also an expensive work.

Also with the present wheel arrangement the tires are flatten to a certain extent at the bottom while they roll. This contact patch rebounds to its original shape once it is no longer in contact with the ground. When this process continues repeatedly, certain friction is generated resulting heat thereby the rubber that holds the tire's cords together tend to melt and the tire fails.

According to the present invention tire flattening at contact patch is prevented by allowing the tire to flex on side walls, while outer circumference of the tire grip with the internal surface of the hoop member.
On the other hand the raw material for tires and manufacturing process are expensive. Also, disposal of tires continue to present environmental and safety hazards.


Tire assembly

Assembly of parts for wheel combination is as shown in Figure 10. Details shown in the Figure are : 1- Wheel hub & Axel, 2-Brake drum, 3-Wheel rim, 4-Tire with grooves to accommodate inner hoop member, 5- Inner hoop member made in two halves to seat over the tire, 6- outer hoop member made in two halves, 7-Tread belt, 8-Gasket between two mating surfaces

Thus the outer rim has made as two identical parts mating two flat surfaces together, accompanied by a gasket.

Usually the rim and the hoop member are made with aluminum, steel or other combination of alloys. The inner tire tread patterns accommodate the grooves and cavities provided on the inner surface of inner hoop member.

The bond between inner tire and outer rim is formed by using an appropriate manufacturing process. During the manufacturing process after the carcass is produced the tire has to place in a special mold that comprises the hoop member (the outer rim) of the wheel also as part of mold.
Then the bladder has to be inflated to push the carcass against the mold for forming the tire outer shape. When the mold take out from the tire the hoop member remains bonded together.

In practice the inner tire may be made with an metallic outer profile without a tread belt, while the disposable outer tire accompanied by tread belt being able to attach to this metallic profile.

Whell Assembly Cross section

New wheel arrangement provides longer life span to tire and minimizing disposable material usage, without changing the overall size of the wheel.  
When the tire is worn out, tire has to dismantle from the vehicle and it is a time consuming and difficult process. With the new arrangement, only the worn out layer of treads is replaced instead of replacing the entire tire.

Air is pumped into the enclosed space through an air valve, so that the tire is inflated and can support the load of the vehicle for its running.

With the present arrangement tire prevent direct contact with the road surface. The tire outer circumference has tread blocks to grip the road, the tread remain rigid while side walls of the inner tire are allowed to flex. Most of the all bicycle tires, many motorcycle tires, and many tires for large vehicles such as buses, heavy trucks, and tractors are designed for use with inner tubes. Inner tubes are torus-shaped balloons made from an impermeable material, such as soft, elastic synthetic rubber, to prevent air leakage and inserted into the tire and inflated to retain air pressure.









Tire and rim assembly

Puncture free tire


The tread potion of the tire is arrested by two identical caps as shown in the figure 11 and the two mating surfaces are fitted together by fasteners with H shape section to form a single hoop member over which desired tread belt is installed. The inner surface of hoop members define the foot print of the mating tire tread pattern.


Latest trends in wheels


The most comprehensive wheel design that would meet all requirements.

Brief Description of the invention
The present invention is a device and a method of assembly for wheels of the vehicles and carriages.
   Basically the tire serves two purposes.  It provide cushioning effect to the vehicle and its loads while it provide traction with its’ treaded surface. The cushioning effect is due to the compressed air inside inflated tire. The traction effect is due to the hard surface around the tire. Although the tire is deformable component it has to perform as a rigid member as well, to provide traction at the same time.
     The present invention assign the cushioning and damping effect to tire while a newly introduced hoop member is placed around the tire outer periphery to provides traction effect, so that the overall combination of tire, rim and the hoop member functions the same manner of prior art wheel arrangement of tire and rim combination, but with additional benefits. Also the new wheel can be manufactured to accommodate same space the prior art wheel accommodate.
     So that new wheel arrangement is a multi-piece assembly consist basically a rim, a tire and a hoop member coaxially arranged around the hub of the axle.
       The hoop member is having an inner circular band of metal and an outer circular band of metal joined by rigid bracing that restrain the said two circular metal bands. To meet with this requirement the hoop member is made with rigid material, prevent from bending, capable of withstanding the loads and torsion acted upon the wheel.

           The inner circular band of the said hoop member accommodates the outer periphery of the tire
to provide a firm grip with the tire, so that tire does not slip against the inner core of the hoop member. The outer metal band of the hoop member is accompanied with hard rubber band around its girth composed of treads to provide traction and to support on ground.  
      With this arrangement the elastically deformable inflated tire of the wheels is positioned above and away from road surface, thereby, the liability of damaging the tire due to punctures is avoided. The tread surface of the outer rim is replaceable. Therefore it is having the advantage of replacement of only the tread layer instead of the entire tire.
      The rim can be fitted to the hub of the axle. The tire is inflatable and it is a doughnut shaped ring made out of inflatable material such like rubber or synthetic and reinforced. The tire fitted between the rim and the hoop member. The rim is having provision for valve to pump air in to the inflatable tire.

The outer hoop member having tread layer supports the vehicle on ground, and during running. Tire may be consisting, a tube if desired. Air is pumped into the enclosed space through a valve positioned on the periphery of the rim, so that the tire can be inflated with an external source.
Deformation due to loads and shocks imposed on tire is allowed on side walls of the tire. The hub of the axle is fitted to the rim over which tire is laid. So that, the wheel is fitted to the hub, by bolts located around the bore. The tire is fitted to the rim, while outer surface of the tire is fitted to the inner band of the hoop member. The contact surface of the tire and the rim are tightly fitted, preventing air migration between rim and beads of the tire.

Thus the inner barrel of hoop member made to accommodate the contact surface of the tire. The inner barrel may consist a lip so that the assembly of the tire into the wheel is made easy. The outer barrel of the hoop member is composed of treads to be in touch with road surface. A tread pattern is formed with resilient material such as rubber, neoprene or combination of such materials over the outer covering fitted to outer metal band of hoop member, consisting treads and belt that will be in touch with road surface and support the load of the vehicle for its running.
Both the rim and hoop member are rigid preventing deformation against the loads and shocks on wheel. The hub and the barrel of the rim are brazed by the metal filling and toughen to prevent bending during traction and loads on wheel.  Preferably the tire outside in contact with the hoop member is having treads while the contact surface of inner hoop member is manufactured to accommodate the trade pattern of the tire.
The tire is inflatable and capable of absorb shocks and bear the loads of the vehicle on the cushion of compressed air so that tire deform and bounce back on side walls due to loads and shocks. Tires provide a gripping surface for traction and serve as a cushion for the wheels of a moving vehicle. Advantageously tire outer surface is inserted with metal protrusions fitted with studs to penetrate through holes formed in the inner hoop member of outer rim to prevent slip during traction.

The tread layer around the outer rim may be composed of circular segments of tread strips connected by adhesive bonding or reverting to the metal surface of outer rim. This will enable to remove a selected portion of treaded surface when a damage take place.

Alternatively, dislodgment of the tire from inner barrel of the hoop member is positively prevented by penetrating the tire material into formation of grooves in the circumference of the inner barrel of the hoop member, to provide an interlock between the tire and hoop member.
The hoop member may be available as combination of two semicircular segments fasten together to form a single hoop member.
Tire inflation valves may be fitted through rim shell. Since the rubber parts of the wheels situated above and away from the road surface, liability of damaging the tire due to punctures is eliminated. This overall compliance of wheel assembly provides a cushioning capability so that wheel assembly can absorb bumps and other road irregularities.

Test run with new wheel assembly 

If the wheel is small the rim combination doesn't have sufficient space to accommodate the brake drum or disk brake components. Then the mounting surface of the rim is offset towards inside, and the wheel may be extending beyond the body of the vehicle. Under such situations some body work has to do by fixing a fender skirts (spats) to wheel well to prevent wheel projecting outwards of the vehicle body. The fender skirt should be made detachable to do any underside maintenance work.

If the tire is projecting outwards the protrusions of tire with fender extension should be within the highway regulation limits, particularly not more that 3" beyond the body.


Case Study 1

For tires having the diameter 500 mm or higher, the rim can accommodate the space required for brake drum or rim and leverage for steering arms. Problem of accommodation space for brake drums met only with rims having comparatively small diameter. When the brake drum (or disk) cannot accommodate inside the rim the tire will project almost half the width of the tire. For heavy vehicles adequate space is available inside the rim.

Case Study 2

If the originally manufactured wheel rim and brake drum combination is having redundant space between brake drum and rim inner periphery, then we can reduce the rim width until the rim is reduced to allowable size. For example if brake drum outer diameter is 200 mm and the rim inner diameter is 300 mm we can replace the original rim with a new custom rim having inner diameter of 250 mm. Thus we can reduce the tire diameter also by gain 100 mm. So that our new tire having diameter of 250mm now. Also a tire with 300 mm would replace the tire of 400 mm diameter.

Therefore we can gain about 100 mm to interpose the outer rim.

Notes on Snow socks and chains:

To prevent tires contacting the ground, snow socks or chains can be applied. But these do not adhere to the tire outer surface. Usually tires flatten certain amount on the ground. Therefore the cover will not always in touch with the tire surface.


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For more information contact : Leelananda Jayasuriya Phone : 0094 112915390

by Leelananda Jayasuriya. 08/04/2012