Device for transmitting measuring signals, for example, for the

Details Device for transmitting measuring signals, for example, for the Device for transmitting measuring signals, for example, for the

1987-08-25

1988-08-09

Woodiel, Donald O.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

340 58, B60C 2302

Patent

active

047619961

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention is related to a device for transmitting measuring signals indicative of tire pressure for motor vehicles.
Such a device is known, for example, from the DE-PS No. 15 05 111. A substantial disadvantage of this known device resides in that it is not possible to interchange the inside and outside individual wheels at a reasonable expense.


SUMMARY OF THE INVENTION

This invention has the object of developing a device of the type mentioned above in such a way as to make possible an interchanging of the internal and external wheels without difficulties.
This object is met by an arrangement of the signal transmitter, which enables an interchanging of the internal and external wheels without in some way interfering with the device according to the invention. Accordingly, an arrangement is obtained, which is important for practice and is considerably simplified, so that faulty operation or damage in connection with the changing or exchanging of tires can be avoided by means of the procedure according to the invention.
It is achieved by means of the arrangement of the first and second transmitters at each individual wheel, that the signals received by the signal receiver have different time intervals so that an identification is made possible by way of the discriminator device by means of determining, when a signal is received, the time that has expired since the preceding signal was received, which identification makes it possible to assign the respective signal to the sensor of the outside or inside wheel.
Other characteristic features, advantages and details of the invention follow from the following description of a preferred embodiment form with the aid of the drawing.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a partial sectional view of a twin wheel which is fastened to a motor vehicle axle;
FIG. 2 shows a schematic presentation of the geometric positions of the individual structural component parts of the device according to the invention;
FIG. 3 shows a basic wiring diagram of the device according to the invention; and
FIGS. 4a and b schematically show the signals for illustrating the signal discrimination between the sensors of the two individual wheels.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A twin wheel 1, which comprises two individual wheels 2 and 3, is shown in FIG. 1. Each individual wheel 2 and 3 substantially consists of a rim 4, 5, a tire 6 and 7 which is fitted on the latter.
Each rim 4, 5 comprises an approximately cylindrical pot casing 8, 9 and a rim pot base 10, 11. The rim pot bases 10, 11 of the individual wheels 2, 3, which latter are identical to one another, adjoin one another and are connected in a known manner to a motor vehicle axle 25, together with a hub 12, by means of screws extending therethrough.
A sensor 13, 14 for detecting the air pressure in the tire 6 and 7, which sensor 13 or 14 can be constructed as a threshold value switch which is dependent on the air pressure, is arranged at each rim 4, 5. In addition, two signal transmitters 17, 18 and 19, 20, respectively are arranged in each instance at each rim 4, 5 in the area of its free outer edge 15 and 16. These signal transmitters 17 to 20 accordingly rotate together with the wheels 2, 3. A signal receiver 21, which is arranged in the area of the axle 25 so as to be stationary, is assigned to the signal transmitters 17 to 20. Coupling devices 22 and 23 are arranged in the area of the rim pot bases 10 and 11.
As is particularly clear from FIGS. 2 and 3, the signal transmitter 20 is connected with the sensor 13 and the signal transmitter 17 via a coaxial wire or cable 30, the coupling device 22 and a coaxial wire or lead 31, while the signal transmitter 19 is connected with the sensor 14 and, via a coaxial cable 32, the coupling device 23 and a coaxial wire or cable 33, with the signal transmitter 18. Accordingly, the signal receiver 21 alternately receives signals of the sensor 13 and the sensor 14 and, accordingly, also alternately receives signals corresponding

REFERENCES:
patent: 4119944 (1978-10-01), Smith

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