This device is designed to enhance the performance, especially traveling and cornering of model cars. This device can greatly extend the lifetime of the wheel, because the wheels reuse repeatedly with the car when tires are replaced.

[Background Techniques) Typical wheel and tire sets of radio control model cars are fixed and are both replaced when the tire is worn down. It is composed of plastic wheel, rubber or sponge tire and inner sponge.

There are two (2) types of wheel and tire sets, as follows ; The one is rubber tire filled with inner sponge to grooved wheel using adhesive. The other is cylindrical hollow sponge tire United with flat-type wheel using adhesive. Because neither of these two types are able to adequately take road features, such as surface conditions and ground contact forces, appropriate tires need to be selected and equipped combining front and rear tires of different compounds under careful observation of road features.

Because shocks from the road surface are absorbed by only the inner sponge and tire, damages at the connection of wheel and tire often happen. When damages are incurred or excessively worn, the whole tire including wheel and inner sponge must be replaced due to their inseparability.

The continuous enhancement of speed and control has been attained thanks to the rapid improvements of engine performance of radio control GP model car, charged dry battery of radio control EP model car and the technology of remote controller and servo. Nevertheless, the present wheel and tire set has not evolved, even though this is one of the most critical components for the car's racing capability, keeping radio control model cars mostly just a toy image.

[Detailed Explanation of Invention, This device was invented to resolve the above problems and is composed of wheel with small air inflation valve, tire and air inflation system. The wheel can be used almost permanently, and the valve has the

structure to enable air inflation into the tire. The tire is reinforced with two reinforcing layers and beads to maintain air pressure. The air inflation system is designed to inflate the air into tire and finely adjust air pressure.

The purpose of this invention is to allow easy tire settings as well as improve the racing capability of RC cars by improving rapid cornering ability from adjusting the pressure of the front and rear tires and by smooth shock absorption capability. To attain this purpose, the special features of this invention are the introduction of light metal, such as aluminum alloy and titanium, or reinforced plastic as the material for the wheel, air inflation valve for easy inflation, rugged tire with reinforced layers and bead for maintenance of inner air pressure and air inflation system for easy pressure regulation.

[Brief Description of Drawings Drawing 1 is outline drawing to depict the air inflation scheme of radio control model car equipped with wheel and reinforced tire with air inflation valve, using pressure controllable air inflation system.

Drawing 2 is structural drawing of wheel designed for seating of air inflation valve and to maintain an airtight seal.

Drawing 3 is structural drawing of reinforced tire with 1st & 2nd layers and beads for maintenance of air pressure and shape.

Drawing 4 is detail drawing of air inflation valve (A-type), in which inflation nozzle of air inflation system is supposed to prick into valve disk Drawing 5 is detail drawing of air inflation valve (B-type), in which inflation nozzle of air inflation system is supposed to push and open valve disk Drawing 6 is detail drawing of easy-to-use single body air inflation valve (C-type) Drawing 7 is outline drawing of pressure controllable air inflation system (A-type) designed to inflate air.

Drawing 8 is outline drawing of rotating air inflation system (B-type) for convenient air inflation Drawing 9 is outline drawing of gun-type air inflation system (C-type) <Description on symbols of major parts of drawings> (1) air pressure vessel : compressed air storage device to supply air to tires (2) pressure controller : a device for buffering and balancing of air pressure (3) pressure indicator : digital instrument to measure tire pressure (4) air inflation nozzle : device to supply air into tires (5) air inflation hole : a part of wheel to be seated with air inflation valve

(8) bead : part fixed to tire rim to keep air pressure (9) reinforced 1st layer : structural part of tire fixed to beads, coiling around bead to keep pressurized air charged in tire (10) reinforced 2nd layer : covering parts fixed to 1st layer's ends to reinforce tire (11) pressure control valve : device to lower the overcharged pressurized air in tire (12), (15) check valves : devices to maintain the direction of air flow and to prevent reverse flow (14) air inflation pump: piston-type device to accurately inflate air into tire (Implementation Form of Invention] Detailed description based on the attached drawings is as follows ; Drawing 2 is the structural drawing of wheel, which has the structure for tire to be installed on it by air pressure not using adhesive. (a) (5) is the air inflation hole with the structure for seating air control valve. (b) (6) is the contact surface of tires, and should be precisely machined for air tight.

(b) (7) is the groove part of wheel. Tire has the reinforced structure with beads and reinforced layers to endure air pressure of tire. Since the flexibility of tire is supposed to be restricted, this part of wheel is designed to have groove for easy insert with tire. (c), (d) and (e) are the detail drawings relevant to air inflation valves according to each types of valves explained in the drawings 4,5 and 6.

Drawing 3 is the composition drawing of tire. (a) shows the structure with 1st & 2nd layers and beads to endure outside shocks during travelling and to fix tire with wheel by pressurized air. Less flexible beads of (b) (8) function to firmly fix tire with rim having the shape of ring to prevent from detachment off tire. 1st Layer of (b) (9) is made of fiber weaved with threads such as stout rayon, folded part covering beads diagonally overlaps with tire radial direction maintaining constant angle. 2nd Layer of (c) (10) fixes 1st layer coiled around beads wrapping in tangential direction with tire, and connection part is placed on the opposit side considering tire balancing. Single body plastic or rubber reinforced layers can be used to replace 1st & 2nd layers and beads, utilizing different methods from the above way.

Drawing 4 (a) is the cross-sectional view of air inflation valve (A-type), which is composed of valve disc part (c) for air inflation nozzle [drawing 7 (b)] to be pricked and reinforced plate (d) for firm maintenance of valve disc.

Valve disc is made of materials such as butyl rubber to recover the shape shortly after air inflation and to facilitate the insertion of air inflation nozzle.

(b) is plane drawing of (a) sawn from the above, and (c) and (d) are the component drawings of air inflation valve.

Drawing 5 (a) is the cross-sectional view of assembled air inflation valve (B-type), in which valve disc is supposed to be pushed for air inflation.

This valve can be permanently used with a different-type nozzle from the above air inflation nozzle. (b), (c), (d) and (e) are component drawing of B-type air inflation valve. When air inflation nozzle pushes (d), (c) provides air inflation route into tire through four (4) holes of it located 90 degrees each other viewed in plane drawing. The surface of (d) contacting with the valve base of (b) is made of rubber material for tight sealing. The fabrication order of components is as follows; Rubber packing is put into air inflation hole for air tight first. Valve base (b) is inserted in the packing from outside to inside, then valve disc (d) and spring (e) are seated on (b).

Finally, valve cap (c) is fastened using screws of (b) and (c). Because the installation of air inflation valve causes unbalance in wheel, a weight for wheel balance correction is added at the inside of opposite wheel at the process of wheel mold.

Drawing 6 (a) is a cross-sectional view of single body-type air inflation valve (C-type) with valve base of drawing 5 and valve cap in one body.

(b) is the plane drawing on (a), valve disc (c) and plate spring (d) function to recover the valve disc to original position after air inflation.

Drawing 7 is the outline drawing of pressure controllable air inflation system (A-type) composed of air pressure vessel, digital pressure indicator, pressure controller and air inflation nozzle, which is equipped with two (2) nozzles for air inflation and pressure control of front or rear tire group at the same time.

Drawing 8 is an outline drawing of handy air inflation system (B-type) composed of air inflation nozzle and pump. (3) is a small digital pressure indicator to measure air pressure. Since tire pressure can be measured by scale on outside cylindrical surface of air inflation pump (14), this indicator can be optionally added if necessary. (4) is air inflation nozzle and can have two (2) types of (a) and (b) in drawing 7. This nozzle is designed as screw-type and is able to be fastened according to the rotation during air inflation for stable installation on wheel, can have the shape of the finger-type like in drawing 7. (11) is a screw-type valve with groove on its lower part at the opposite side of screw head along the same direction as the screw proceeding direction to finely regulate overcharged pressure by throttling this valve. There is ring-type rubber seal for air tight, and when opened, the inflated air can be discharged little by little, and sealing can be maintained in case of valve close. (12) and (15) are check valves to maintain

constant air flow direction and to prevent from reverse flow. When (17) is rotating for air inflation into tire, (12) is supposed to open and (15) is closed at the same time. Reversely, (12) will be closed and (15) opened in case of reverse rotation of (17) to charge air into air inflation pump. (13) is rubber tube connecting air inflation nozzle (4) with air inflation pump (14).

Because air inflation pump (14) is made of transparent material, the amount of inflated air can be estimated by the position of piston (16). (16) and (17) are components of air inflation pump, which inflates air into tire by right rotation and inflates air into air inflation pump by reverse rotation.

Drawing 9 is the outline drawing of gun-type air inflation system (C-type), which is similar to B-type system. (12) is ball-type check valve, and (17) is trigger. The piston (16) is supposed to inflate air into tire by the mechanism of rack and pinion (18) when the trigger (17) is pulled.

New air will be inflated into the air inflation pump (14) through check valve (15) by the elastic spring (19) by setting the trigger loose. Gun-type is a convenient air inflation system, can be handled with just one hand. As a same-type, a gun-type electric air inflation system (C'-type) can be designed with the composition of small compressor, DC motor, air regulator and rechargeable dry battery in the positions of (14), (16), (17), (18), (19) in drawing 9, also (14), (16), (17), (18), (19) can replaced with small air pressure vessel (1) and pressure regulating valve (v1) instead. industrial Usability] As explained above in detail, this invention is composed of light metal wheel with air inflation valve, tire with reinforced layers and beads and air inflation system to inflate and regulate air. With these features, tire replacement is very easy and much different from the adhesion type of wheel, so it can be usable permanently if there is no deformation to the wheel.

Futhermore, this invention can enhance the racing capabilities of RC cars by absorbing the shocks from the road surface and kinetic loads to improve performance for high speeds and turns.