DE102010012475A1 - Sealing assembly, particular box seal for sealing wheel bearing, has inner sealing ring equipped with signal transmitter, where outer sealing ring has measuring probe with transmitting element - Google Patents

Abstract

The sealing assembly has an inner sealing ring (11) and an outer sealing ring (5), where the sealing rings enclose an annular space. The inner sealing ring is designed for attachment to a stationary bearing part (2). The inner sealing ring has a signal transmitter (10), where the outer sealing ring has a measuring probe (3) with a transmitting element.

Description

Field of the invention

The The invention relates to a sealing arrangement, in particular a cartridge seal, for sealing a rolling bearing with an inner sealing ring and an outer sealing ring, wherein the sealing rings an annular Enclose space and the inner sealing ring for attachment to a fixed Bearing part and the outer seal ring is provided for attachment to a rotatable bearing part.

Background of the invention

at different rolling bearings, In particular wheel bearings, it is useful for various reasons information about the Accumulating state of storage, which is not only statements about the Warehouse or over its damage possible are, but also measures can be initiated which have been recognized by the storage condition. A possible application is the detection of speeds at the wheel bearing, which is to control an anti-lock braking system is useful, or even in an industrial Application can be used in the knowledge of the bearing speed is useful.

To is a signal generator, for example. An encoder or Multipolencoder on a moving part of the rolling bearing, z. As a hub, set, which is a periodic rotation Signal is generated in the sensor, which on a fixed bearing component, for example, a wheel carrier or similar, is attached.

Just in security matters it is necessary to have more information about the Accumulate world camp so that a security measure is automatically initiated or the user may be on a malfunction or the like can be pointed out.

For this have been used in the past in conjunction with rolling bearings temperature sensors, used as so-called end-of-life sensors, which is a special high temperature. This could be recognized that the lubricant already had to be burnt or at least its lubrication functions not exercise anymore could.

Further were structure-borne sound sensors in a similar way Way used to detect special frequencies, the on damage of the rolling bearing shut down left. So far have been for each sensor assembly uses its own components, which are separately attached to the rolling bearing unit have been attached. Because of this, a lot is separate Steps necessary to install the respective sensors.

Object of the invention

Of the Invention, the object of a seal assembly for rolling bearing units, in particular Specify wheel bearing units that have a plurality of sensors, in a simple, safe and cost effective way rolling bearing unit can be installed and connected to the measurement data recording.

Summary of the invention

According to the invention is a Seal arrangement provided, which consists of at least one inner sealing ring and an outer sealing ring consists. Both sealing rings together enclose an annular space. In particular, the inner sealing ring can at least one, as a rule However, have a plurality of sealing lips, wherein both axially, as Also radial sealing lips are conceivable. In this case, the outer sealing ring a contact surface to disposal, with which the respective sealing lip a sliding sealing contact forms.

advantageously, the seal assembly is designed as a cartridge seal, at the inner and outer sealing ring before mounting on the rolling bearing held together, such as by a positive connection the elastic sealing lips.

The outer sealing ring is on a fixed bearing part, such as a journal or a fixed inner ring attached. A press fit would turn out offer here. Advantageously, the outer sealing ring closes with the axial outer surfaces of the fixed bearing part or a rotatable bearing part, so that the penetration of water and dirt particles is prevented. For this purpose, the gap between the outer sealing ring and rotatable bearing part or rotatable inner sealing ring possible be chosen small.

Of the wearing inner sealing ring a signal generator, such as a multipole encoder or a different type of signal transmitter, passing through the outer seal ring causes different sensor signals in a fixed sensor.

Furthermore, the outer sealing ring has at least one measuring sensor with a transmitting element. The measuring sensor is suitable for recording a physical measured variable, such as temperature, strain or structure-borne noise, and forwarding it to the transmitting element. The transmitting element transmits the measured values wirelessly through the outer Sealing ring through to the sensor. It is also conceivable that a measuring sensor is provided in each case for a measured variable, which is in each case equipped with a transmitting element in order to transmit its own measured values. Advantageously, this results in a measuring system, which manages with a single sensor, which is able to communicate with multiple sensors, or record their measurement data and possibly further process and / or forward.

at an advantageous embodiment is the sensor mounted on a fixing part of the sealing ring. The fastening part of the outer one. seal ring is formed cylindrically and by means of press fit on the fixed Fixed bearing part. It is advantageous that the fastening part of the sealing ring directly on a part of the rolling bearing is arranged, and thus the signal recording is optimally supported.

advantageously, the seal assembly is designed as a cassette seal, which a multi-measuring function only by means of the sealing arrangement can be established. This will also be the installation at the wheel bearing very easy, since only the seal assembly are pressed must be to the sensor to place. A series of steps to install known sensors fall away.

at an advantageous embodiment is the transmitting element, in particular a ring antenna, on the fastening part intended. At this point the ring antenna is very good the seal assembly protected from environmental influences, but is still axial oriented to the sensor, so that only a small distance for the signal transmission to be bridged got to.

advantageously, the transmitter element is at least partially surrounded by the signal generator, thus a very good space savings can be achieved.

Further it is conceivable that the transmitting element with the signal generator and / or the inner sealing ring forms a sealing gap. Take that with you Transmitting element, as well as the signal generator a dual function and contribute further to the space optimization.

Independently of, whether the sensor a strain sensor, temperature sensor or structure-borne noise sensor, this can be radial and at least partially from the inner sealing ring be covered axially. This is advantageous because sensor at the Handling or during installation can be damaged. by virtue of However, said cover is already a direct touch of the probe not possible with the installation of the seal assembly, because the seal assembly is pressed axially in one piece.

The inventive sensor arrangement includes a sensor that is used to record signal from the signal generator and signals of the transmitting element is provided. Possibly. can also Signals of multiple transmission elements are received, bringing the measured data different sensor wirelessly transferable to the sensor are. Thus, the sensor acts as a common receiving point, which collects the measurement data and forwards and also processes if necessary.

at an advantageous embodiment the sensor is located on the outer sealing ring at. Ideally, this one with a spring or another be biased elastic element.

Description of the drawing

In the figure, a tapered roller bearing shown in longitudinal section is shown with a seal assembly. The tapered roller bearing consists of a fixed inner ring 2 , which has an outer race for the tapered rollers 9 and radially from the load-bearing outer ring 1 is included.

The outer ring 1 is in the wheel hub 8th pressed in, just like the inner sealing ring 11 in the wheel hub 8th was pressed. Also the outer sealing ring 5 was on the fixed inner ring 2 pressed. The inner sealing ring 11 carries a total of 3 different sealing lips, wherein the outer sealing lip an axial sealing lip, the radially middle sealing lip is a spring-loaded radial sealing lip and the inner is a radial sealing lip, which over the fixed inner ring 2 grinds.

The sensor 3 can be designed as a temperature sensor, strain gauge or structure-borne sound sensor, its measured values via the loop antenna 4 a signal to the sensor 7 emits. Although the probe 3 and its transmitting element 4 are arranged on a fixed sealing ring, so they are optimally protected from the outside world, but can still provide the necessary information to the outside. There is also the advantage that the fixed inner ring 2 may well slip in the circumferential direction, as is often the case with trucks, which means a fixing device for the inner ring 2 is saved.

At the same time the sensor serves 7 for detecting the alternating magnetic field of the Multipolencoders, which also by the outer sealing ring 5 is protected.

Advantageously, the sensor is 3 on the fastening part 15 arranged, which one good coupling to the inner ring 3 but still optimally protected from the outside world.

It is also advantageous that both the Multipolencoder 10 , as well as the sensor 3 and the ring antenna 4 can contribute to a certain extent to the design of the sealing gap, which extends partially in the axial and partially in the radial direction.

The sensor 7 It is designed so that it can record the speed data, the structure-borne noise data and the temperature data.

In summary the invention relates to a sealing arrangement, in particular a cartridge seal, for sealing a rolling bearing, in particular wheel bearing can be used and an inner sealing ring and an outer sealing ring having. The sealing rings enclose an annular space, wherein the inner seal ring carries a signal transmitter and the outer seal ring at least one sensor having a transmitting element. This ensures that a complex Sensor arrangement with a plurality of different sensors easily by pressing the seal assembly on a rolling bearing, such as on the wheel bearing, can be installed without the electronic Components, such as probes or a loop antenna to damage.

LIST OF REFERENCE NUMBERS

1

outer ring

2

inner ring

3

probe

4

ring antenna

5

outer sealing ring

6

outer surface

7

sensor

8th

wheel hub

9

tapered rollers

10

multipole

15

attachment portion

Claims (9)

Sealing arrangement, in particular a cartridge seal, for sealing a roller bearing, with an inner sealing ring ( 11 ) and an outer sealing ring ( 5 ), whereby the sealing rings ( 5 . 11 ) enclose an annular space and the inner sealing ring ( 11 ) for attachment to a fixed bearing part ( 2 ) and the outer sealing ring ( 5 ) for attachment to a rotatable bearing part ( 8th ) are provided, characterized in that the inner sealing ring ( 11 ) a signal generator ( 10 ) and the outer sealing ring ( 5 ) at least one sensor ( 3 ) having a transmitting element. Sealing arrangement according to claim 1, wherein the sensor ( 3 ) on a fastening part ( 15 ) of the sealing ring ( 5 ) is attached. Sealing arrangement according to one of the preceding claims, wherein the transmitting element ( 4 ), in particular a ring antenna ( 4 ), on the fastening part ( 15 ) is provided. Sealing arrangement according to one of the preceding claims, wherein the transmitting element ( 4 ) from the signal generator ( 10 ) is at least partially included. Sealing arrangement according to one of the preceding claims, wherein the transmitting element ( 4 ) with a signal generator ( 10 ) and / or the inner sealing ring ( 5 ) forms a sealing gap. Sealing arrangement according to one of the preceding claims, wherein the measuring sensor ( 3 ) is a structure-borne sound sensor, temperature sensor or a strain sensor. Sealing arrangement according to claim 6, wherein the sensor ( 3 ) of the inner sealing ring ( 11 ) is covered radially and at least partially axially. Sensor arrangement with a sealing arrangement according to one of claims 1 to 7, and a sensor ( 7 ), which is used to record signal from the signal generator ( 10 ) and signals of the transmitting element ( 4 ) is provided. Sensor arrangement according to claim 8, wherein the sensor ( 7 ) on the outer sealing ring ( 11 ) is present.

Images