Pressure sensor for determining tire pressure

Details Pressure sensor for determining tire pressure Pressure sensor for determining tire pressure

1990-10-26

1992-02-25

Woodiel, Donald O.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

73756, 116 34R, 340442, B60C 2304

Patent

active

050902377

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a pressure sensor or switch for determining the air pressure in the interior of tubeless tires of motor vehicles mounted on a rim, wherein the housing of the pressure sensor or switch penetrates a corresponding recess of a rim wall and is fastened at the rim in an airtight manner of fastening devices.
Such a pressure sensor, as is known e.g. from DE-OS 35 23 774, serves to monitor the air pressure in a tubeless motor vehicle tire and to send an electrical signal when the air pressure in the tire diverges from the normal state, particularly when the air pressure drops as a result of a defect in the tire wall.
In order to fasten such pressure sensors or switches the housing conventionally comprises an external thread and is inserted into a recess of the rim, wherein the housing is then clamped against the rim wall so as to be airtight by a nut secured on the thread.
This type of fastening has the disadvantage that the pressure sensor or switch projects relatively far over the rim wall due to the required thread length. This is undesirable in technical respects relating to mounting and involves the risk of damage when changing tires. But, above all, the detection interval for the signal transmission from the sensor to a receiver, which is fixed with respect to rotation relative to the latter, is reduced because of the metallic nut, which damps the resonant circuit provided for the signal transmission.


SUMMARY OF THE INVENTION

The object of the invention is a pressure sensor or switch that can be fastened at a rim wall in a simple manner so as to be protected against damage and so as to benefit the signal transmission and can be detached again as required.
This object is met, according to the invention, in that the housing comprises an outer flange portion which rests against the rim wall and a circumferentially extending annular flange at a distance from the latter, wherein spring elements are provided which are supported at the annular flange on one hand and at a side of the rim wall on the other hand in order to clamp the flange portion of the housing against the other rim wall.
This clamping by of a spring as discussed above, enables a quick and simple mounting which can be realized with a small overall height and offers the additional advantage that removal is not impeded by corrosion or damage to a thread.
It is preferably provided that the flange portion comprise a circumferentially extending annular groove for a sealing O-ring. An airtight closure of the tire interior is ensured in this way by the spring clamping.
The flange portion can be advantageously constructed in a conical manner for contacting a correspondingly constructed wall portion of the rim wall. A type of wedge clamping and accordingly a particularly secure fit can accordingly be achieved. If the wedge surface contacts the housing wall at the inside of the rim wall, the secure fit of the housing is further increased due to the centrifugal force.
In a particularly advantageous embodiment form, the annular flange is formed by two corresponding annular disk halves which can be inserted into an annular groove of the housing. It is accordingly readily possible to slide the housing of the pressure sensor or switch through the corresponding recess in the rim wall and then to attach the annular disk halves from the other side in order to achieve an axial fastening in this manner.
The spring which is provided between the rim wall and the annular flange can be constructed advantageously as a type of a plate spring, wherein details of shape can differ from the conical configuration of a plate spring.
It is advantageously provided that the plate spring comprises projections and recesses which correspond to corresponding recesses and projections of the annular disk halves. In this way, the annular disk halves are also fixed in the radial direction after attachment when the corresponding projections and recesses engage in one another.
In another embodiment form, it is provided that the plate spri

REFERENCES:
patent: 2868908 (1959-01-01), Robinson
patent: 3881170 (1975-04-01), Hosaka et al.
patent: 4768375 (1988-09-01), Eckardt et al.
patent: 4790179 (1988-12-01), Hettich
patent: 4843872 (1989-07-01), Hebert et al.
patent: 5035137 (1991-07-01), Burkard et al.

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