DE20003645U1 - Device for carrying out measurements, in particular vibration measurements, on a roller bearing - Google Patents

Description

SKF GmbH Schweinfurt, 22.02.2000

AT 00 001 DE STP-go.se

Description

Device for carrying out measurements, in particular vibration measurements, on a rolling bearing

The invention relates to a device for carrying out measurements, in particular vibration measurements, on a rolling bearing, which comprises:

- a holding and receiving element for holding and receiving a ring, in particular the inner ring, of a rolling bearing,

- a drive element for driving the ring of the rolling bearing held by the holding and receiving element and

- Measuring equipment for measuring properties of the rolling bearing, in particular vibrations of the rolling bearing,

wherein the holding and absorbing torque comprises means for elastically expanding the ring of the rolling bearing.

A vibration measuring device of this type is known from DE 195 12 990 C2. To measure the noise of a rolling bearing, the radial play must first be eliminated. To do this, the inner ring of the bearing is placed on a hydraulically expandable mandrel and expanded until the play is eliminated.

The rolling bearing is then set in rotation by means of a drive device and the resulting vibrations are recorded by a measuring system. In the German patent specification mentioned, a relatively complex hydraulic circuit is provided for expanding the inner ring of the rolling bearing, which represents a correspondingly high cost factor in the noise measuring device.

Based on this, the invention is based on the object of creating a vibration measuring device of the type mentioned at the beginning, which is characterized by a particularly simple structure that can be implemented with correspondingly low economic expenditure. Particular attention should be paid to the fact that the expansion of the inner ring of the bearing can be carried out in a particularly simple manner, which should also simplify the replacement of the rolling bearings to be measured.

The solution to this problem by the invention is characterized in that

that the means for elastically expanding the ring of the rolling bearing comprise an actuator and a piston-cylinder system,

where the actuator can act on the piston-cylinder system and

wherein the piston-cylinder system is connected to the holding and receiving element and can exert a hydraulic pressure via a fluidic connection on an expansion chamber which is connected to the ring of the rolling bearing

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adjacent.

The design according to the invention makes it possible to carry out the clamping process before measuring a rolling bearing in a very simple manner, since it is limited to the mechanical actuation of a pressure element by the actuator.

According to a first development, it is provided that the piston-cylinder system is connected to the holding and receiving element in a rotationally fixed manner. The actuator provided for actuation can be designed as a hydraulically or pneumatically operated, linearly movable system. Alternatively, it is also conceivable that the actuator is an electrically operated, linearly movable element. It is preferably provided that the direction of movement of the piston-cylinder system is arranged perpendicular to the direction of expansion of the expansion chamber.

A particularly simple design is obtained if it is provided that the fluidic connection consists of two bore areas arranged in the interior of the holding and receiving element, wherein one bore area is arranged in the direction of the expansion of the expansion chamber and one bore area is arranged in the direction of the movement axis of the piston-cylinder system and wherein both bore areas intersect.

It is advantageous that the piston of the piston-cylinder system is immersed in the bore area which extends in the direction of movement of the piston-cylinder system.

Finally, simplified handling is achieved by the fact that holding elements are arranged on both sides of the outer ring of the rolling bearing, which hold the outer ring in the measuring position without damping.

The proposed vibration measuring device is characterized by a simple structure, which enables a correspondingly cost-effective implementation. Furthermore, a very simple operation is ensured.

The drawing shows an embodiment of the vibration measuring device according to the invention.

Show it:

Figure 1 shows schematically the section through the front view of the device in the unclamped state,

Figure 2 shows the same representation as in Figure 1, but in the tensioned state.

The noise measuring device 1 can be seen in Figure 1. It has a holding and receiving element 2 which can carry a rolling bearing 4 to be measured. For this purpose, the bearing 4 is placed or pushed with its inner ring 3 onto the holding and receiving element 2. In the state shown in Figure 1, the clamping process has not yet taken place, which is why it is possible to push the inner ring 3 of the bearing 4 onto the corresponding seat surface of the holding and receiving element 2 without any problem.

The holding and receiving element 2 is connected to a drive element 5 in a rotationally fixed manner. This means that when the bearing is clamped, the bearing 4 can execute a rotational movement that essentially corresponds to the subsequent operation. To determine the noise or vibrations emitted by the bearing 4, a noise measuring device 6 is arranged on the outer ring 17 of the bearing 4. Lateral holding elements 16 ensure that the outer ring 17 is held in the measuring position without damping.

As already described, the bearing 4 is first placed on the holding and receiving element 2 without any tension. Before the measuring process can be carried out to determine the noise behavior of the bearing 4, it must be ensured that the radial bearing play is eliminated. For this purpose, an expansion chamber 7 is integrated in the holding and receiving element 2, which can be pressurized with fluid so that it expands and presses against the inside of the inner ring 3 that is placed on it. The inner ring is thereby

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expanded, in turn presses the rolling elements or balls of the bearing 4 against the outer ring 17 and in this way eliminates the play.

To apply the required pressure in the expansion chamber 7, a fluidic connection 8 is incorporated into the holding and receiving element 2. In the exemplary embodiment, the fluidic connection consists of two intersecting holes that are at right angles to one another. One (axially running) hole is connected to the piston-cylinder system 9. The piston 15 of the piston-cylinder system 9 presses into the end area of the fluidic connection and - when moved to the left - compresses the oil in the fluidic connection; the direction of movement of the piston-cylinder system is designated in Figure 2 with the position number 11.

An actuator 10 presses mechanically in the direction of movement 11 on the outside of the piston-cylinder system 9 and in this way causes the piston 15 to be displaced. Due to the fluid pressure built up in the fluidic connection between the piston-cylinder system 9 and the expansion chamber 7, this is expanded in the direction 12 (see Figure 2).

While Figure 1 shows the situation where the bearing 4, which is still tension-free, is placed on the holding and receiving element 2, Figure 2 shows the clamping situation. The actuator 10 has pressed the piston-cylinder system 9 and thus the piston 15 to the left in the direction of movement 11, so that oil located in the bore areas 13 and 14 of the fluidic connection 8 is pressed into the expansion chamber 7. This expands and eliminates the bearing play in the manner described above.

As can be seen from the comparison of the two positions of the bearing 4 in Figure 1 and Figure 2, the expansion process of the inner ring also centers the bearing to such an extent that the rolling elements are positioned symmetrically.

Although it is in principle possible to expand the inner ring of the bearing using pneumatics, the use of hydraulic oil will generally have to be considered; this is the only way to build up a sufficiently high pressure that leads to the expansion of the bearing inner ring.

SKF GmbH Schweinfurt, 22.02.2000

ATOOOOlDE STP-go.se

Device for carrying out measurements, in particular vibration measurements, on a rolling bearing

List of reference symbols: Noise measuring device 1 Holding and receiving element 2 Inner ring 3 roller bearing 4 Drive element 5 Noise measuring equipment 6 Expansion chamber 7 fluidic connection 8th Piston-cylinder system 9 Actuator 10 Direction of movement of the piston-cylinder system 11 Direction of expansion of the expansion chamber 12 Bore areas of the fluidic connection 13, 14 Piston of the piston-cylinder system 15 Holding elements 16 Outer ring 17

Claims (8)

1. Device (1) for carrying out measurements, in particular vibration measurements, on a rolling bearing (4), comprising: - a holding and receiving element (2) for holding and receiving a ring (3), in particular the inner ring, of a rolling bearing (4), - a drive element (5) for driving the ring (3) of the rolling bearing (4) held by the holding and receiving element (2) and - measuring means (6) for measuring properties of the rolling bearing (4), in particular the vibrations of the rolling bearing (4), wherein the holding and receiving element (2) has means (7, 8, 9, 10) for elastically expanding the ring (3) of the rolling bearing (4), characterized in that
that the means (7, 8, 9, 10) comprise an actuator (10) and a piston-cylinder system (9),
wherein the actuator (10) can act on the piston-cylinder system (9) and
wherein the piston-cylinder system (9) is connected to the holding and receiving element (2) and can exert a hydraulic pressure via a fluidic connection (8) on an expansion chamber (7) which adjoins the ring (3) of the rolling bearing (4). 2. Device according to claim 1, characterized in that the piston-cylinder system (9) is connected to the holding and receiving element (2) in a rotationally fixed manner. 3. Device according to claim 1 or 2, characterized in that the actuator (10) is a hydraulically or pneumatically operated linearly movable system. 4. Device according to claim 1 or 2, characterized in that the actuator (10) is an electrically operated linearly movable element. 5. Device according to one of claims 1 to 4, characterized in that the direction of movement (11) of the piston-cylinder system (9) is arranged perpendicular to the expansion direction (12) of the expansion chamber (7). 6. Device according to one of claims 1 to 5, characterized in that the fluidic connection (8) consists of two bore regions (13, 14) arranged in the interior of the holding and receiving element (2), wherein one bore region (13) is arranged in the direction (12) of the expansion of the expansion chamber (7) and one bore region (14) is arranged in the direction of the movement axis (11) of the piston-cylinder system (9), and wherein both bore regions (13, 14) intersect. 7. Device according to claim 6, characterized in that the piston (15) of the piston-cylinder system (9) dips into the bore region (14) which extends in the direction of movement (11) of the piston-cylinder system (9). 8. Device according to one of claims 1 to 7, characterized in that holding elements (16) are arranged on both sides of the outer ring (17) of the rolling bearing (4), which hold the outer ring (17) in the measuring position without damping.