Resilient tires and wheels – Tires – resilient – Inflating devices
Patent
1997-08-05
2000-11-21
Lorin, Francis J.
Resilient tires and wheels
Tires, resilient
Inflating devices
340442, 141 95, B60C 2300
Patent
active
061488887
DESCRIPTION:
BRIEF SUMMARY
OBJECT OF THE INVENTION
The present invention relates, as its title indicates, to a method which allows to measure tire pressure and adjust it to reference values, taking into account the variations which may have been produced in said reference values due to changes in tire temperature.
BACKGROUND OF THE INVENTION
One of the factors which directly affects the driving of a vehicle is the pressure of the tires and, although checking the pressure should be, in principle a simple operation, when the user attempts to carry out the checking he finds a series of problems that in many occasions lead him to give up the attempt as such operation implies loss of time while it also gives rise to getting the users hands dirty, or at best, the user inflates tires untill a value of pressure which he believes to be the correct one, while the appropriate pressure at that particular moment would be different.
The problem for the user when checking the pressure is that he has to obtain the pressure values corresponding to front and rear wheels; however these values vary depending upon whether the tires are cold or warm. As the quantification of these factors is subjective, the user usually chooses an average pressure or a reference pressure value that he considers the most suitable.
At present there are known pressured-air supplying machines on the market, which incorporate a series of push-buttons, each one of which corresponding to a pre-determined pressure value, so that when one of the push-buttons is pressed the machine adjusts the tire pressure to the value assigned to the pressed push-button.
The influence of temperature of the tires on their pressure is important; that is why tire manufacturers recommend an increase of the reference value of 0.3 bar if the pressure is checked when tires are warm. In doing so, the problem of determination of the temperature of the tire comes across, as this temperature may vary more than 50.degree. C. depending upon the environmental temperature and, on the other hand, upon whether the tire has been resting or it has just finished running at a high speed.
DESCRIPTION OF THE INVENTION
In order to overcome these problems, the system which is object of this invention has been developed, which allows to determine the pressure equivalent to the nominal pressure given by the tire manufacturer, as a function of the temperature of the tire at the moment of carrying out the reading and to supply said equivalent pressure by means of a pressured-air machine, which forms part of the system. The equivalent pressure is therefore a pressure which under temperature conditions different from the environmental temperature would be the appropriate one for the use of the tire.
The method of the invention therefore permits, during the pressure checking and during the adjustment of the same, to know which is the present pressure of the tire, the temperature inside the same and the corresponding pressure that it should have, as a function of the temperature inside the tire as well as the nominal pressure at environmental temperature given by the manufacturer.
Once the temperature and the present pressure of tire are known, the user can effect the pressure adjustment either manually, or by using an automatic adjustment procedure.
In order to know the data corresponding to the present temperature and pressure of a tire, the system of the invention uses a sensor mechanism installed inside the tire.
According to an embodiment of the invention, the system consists of a valve which may be the conventional inflating valve which incorporates a thermocouple, a portable pressure tester and a pressured-air supplying machine.
The valve incorporates a thermocouple which emerges out from the back zone of the valve, thereby permitting the thermocouple remain located inside the tire when the valve is mounted thereon, the conductors of the thermocouple having at the ends thereof a pair of contact points outside the valve at the front zone of the same.
The portable pressure tester, of digital type, has a mouthpiece f
REFERENCES:
patent: 3913632 (1975-10-01), Dudar
patent: 4334215 (1982-06-01), Frazier et al.
patent: 5179981 (1993-01-01), Hicks et al.
Fast Air S.L.
Lorin Francis J.
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