Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1989-02-04
1991-07-23
Orsino, Joseph A.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
340445, 340448, B60C 2302
Patent
active
050332953
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for transmission and evaluation of measurement signals for the tire pressure of tubeless tires mounted on rims in single and twin wheels of motor vehicles which device comprises a pressure sensor arranged in the rim wall and electrically connected with a signal transmitter coil arranged at the rim, as well as a high-frequency resonant circuit signal evaluation arrangement which comprises a signal pick-up coil and is connected with the motor vehicle in the area of the axle so as to be stationary.
Such a device is known, e.g., from DE-OS 35 41 529. The problem of achieving a signal transmission independent of exchanging of single wheels, was already solved in the previously known device. However, a signal transmission is not possible in the previously known device when the vehicle is stationary. But this is also of considerable importance in practical operation, since the vehicle driver should receive a warning signal already before starting to drive if the tire pressure is no longer at the required level after a pause in driving.
SUMMARY OF THE INVENTION
The object of the invention is a device of the type mentioned in which a pressure signal transmission is simple in terms of design, is reliable and can also be achieved in the rest state in both single and twin tires.
This object is achieved, according to the invention, in that a first repeater coil, which is electrically connected with a second repeater coil, is arranged in the area of the signal transmitter coil at the hub carrying the rim, which hub is connected with the latter so as to be fixed with respect to rotation relative to it, and the second repeater coil is constructed as a toroidal coil whose coil axis lies in the hub axis, and wherein the signal pick-up coil of the stationary high-frequency resonant circuit signal evaluating arrangement is arranged in the magnetic field area of the second repeater coil.
The arrangement and construction of the second repeater coil ensures that a measurement signal is not only transmitted from the sensor to the evaluating arrangement in predetermined angular positions, and accordingly only during the rotation of the wheel, but rather that a continuous measurement signal transmission is ensured, since the signal transmitter coil and the first repeater coil are not rotated relative to one another, and the second repeater coil can transmit signals to the evaluating arrangement regardless of its angular position. Only the evaluating arrangement or the high-frequency transmitter and receiver parts of the evaluating arrangement, respectively, need be magnetically coupled with the repeater coil.
In a further development of the invention, it is provided that the signal transmitter coil and the first repeater coil are arranged in the area of the rim cup base. In this area, the rim is mechanically connected with the hub in a conventional manner by screws, so that the narrow spatial proximity of the two coils which is desirable for a reliable transmission from the signal transmitter coil to the first repeater coil, can also be realized in this area.
It is provided in an advantageous manner that mechanical catch devices are arranged at the rim or at the hub in such a way that the rim can be mounted only in a predetermined angular position relative to the hub in each instance. This ensures that the signal transmitter coil and the first repeater coil are arranged so as to be spatially adjacent to one another, preferably opposite one another, when the rim is mounted on the hub, even if this is done by untrained or inattentive persons. Usually, a pin and a hole are already provided at the hub and rim in order to align the holes of the rim with the threaded holes of the hub for the insertion of screws when mounting the rim. Accordingly, in order to realize a mechanical catch device, according to the invention, e.g., only a second pin of this type with a corresponding hole need be provided, so that the rim can be mounted in only one predetermined angular position.
REFERENCES:
patent: 3930224 (1975-12-01), Whiteing et al.
patent: 4130817 (1978-12-01), Hill et al.
patent: 4334428 (1982-06-01), Fima et al.
patent: 4389884 (1983-06-01), Agulia
patent: 4761996 (1988-08-01), Schmid et al.
Genzel Michael
Hettich Gerhard
Schmid Gu
Orsino Joseph A.
Robert & Bosch GmbH
Striker Michael J.
Swarthout Brent
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