RU2344399C2 - Stand for testing frictionless bearing for durability - Google Patents

Abstract

FIELD: physics, testing.

SUBSTANCE: invention relates to the field of test engineering, particularly to testing radial frictionless bearings for durability during local loading. The stand includes a support frame with a case mounted on it in the form of a cylinder and two end shields. Mounted on the case is a shaft with four bearing - two for testing and two accessorial. Two load levers pivotally connected with the case of the stand. A load lever with a load through a telescopic prop, load plug coupler and the accessorial bearing form a load on the shaft, and the shaft - a load on the internal ring of the bearing being tested. Rotation of the shaft stand takes place due to the fact that, an armature is pressing on the shaft, and on the case of the stand has been put the stator coil of the asynchronous motor, which allows to exclude external transmission.

EFFECT: increasing precision of results of testing and design simplification of the stand for testing radial bearings with local loading for durability.

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Description

FIELD OF THE INVENTION

The invention relates to the field of testing equipment, in particular to testing radial rolling bearings for durability under local loading.

State of the art

A device stand for testing rolling bearings for durability [1]. The test bearings 1 are loaded through the shaft 2 and the inner rings (figure 1). The loading system is hydrostatic 3. The drive pulley 4 is installed outside the test head 5. It is mounted on a special shaft 6, which is connected to the shaft 2 of the test head 5 by a coupling 7.

Design flaws include:

1. The complexity of the design and high material consumption.

2. Not completely eliminated the additional load on the tested bearings created by the drive. Its value is difficult to take into account and it significantly distorts the accuracy of the test results.

The closest technical solution to the claimed device (prototype) is the design of the stand [2], the circuit diagram of which is presented in figure 2. A shaft 2 with thrust bearings 9 is installed in the housing of the stand 8. The test bearings 1 are mounted on the shaft 2 and in two replaceable housings 10. The load on the tested bearings is made through two loading levers 11 with weights 12 pivotally connected to the housing of the stand 8 and create a load on interchangeable housings 10 with tested bearings 1. The drive of the stand is carried out from the electric motor 13 through the belt 14 and the pulley 4 on the shaft of the stand 2. The disadvantages of the stand are:

1. Loading is carried out on the outer ring of the bearing, and not on the inner, which is uncharacteristic of most bearings and distorts the working conditions of the tested bearings.

2. Belt drive creates additional load on the tested bearings, which cannot be taken into account. The magnitude of the additional load depends on the belt tension, which is constantly changing due to wear of the belt, pulleys, etc. This significantly distorts the accuracy of the test results.

Disclosure of invention

The objective of the invention is: 1) the elimination of not taken into account the load on the tested bearings; 2) ensuring the load on the inner rings of the tested bearings; 3) reducing material consumption and simplifying the design of the stand.

The technical result in the implementation of the invention is to increase the accuracy of test results and simplify the design of the stand for testing radial bearings under local durability.

The stand includes a support frame on which the housing is mounted in the form of a cylinder with two bearing shields. A shaft with two tested bearings and two auxiliary bearings is installed in the housing of the stand. The load on the rings is created by two loading levers pivotally connected to the stand body.

The first distinguishing feature of the prototype is that the stand is driven internally and the shaft is rotated due to the armature being pressed onto the shaft and the stator winding of the induction motor installed. This distinguishing feature eliminates the unaccounted load on the tested bearings created in the prototype by the drive belt, improves the accuracy of the test and simplifies the design of the stand.

The second distinctive, essential feature of the prototype is that the thrust bearings are testable, and the loading lever is connected to a screw adjusting mechanism, rigidly connected by an eye with a telescopic strut having a spherical tip at the end pivotally connected to the load fork. The load fork is mounted on the outer ring of the auxiliary bearing, pressed onto the shaft. This distinctive, essential feature provides loading of the inner rings of the tested bearings and more reliable research results.

Thus, the claimed technical solution has distinctive essential features from the prototype and thereby meets the criteria of the invention with significant differences and novelty.

Brief Description of the Drawings

Figure 1. Schematic diagram of the test bench for rolling bearings.

Figure 2. Scheme of the stand for testing rolling bearings for durability.

Figure 3. Scheme of the stand for testing rolling bearings for durability.

Figure 4. Screw adjusting mechanism.

Figure 5. Load fork.

6. Telescopic stand.

The implementation of the invention

Design description

The stand includes a support frame 15 (Fig. 3), on which the housing 8 is mounted in the form of a cylinder with two bearing shields 16. A shaft 2 is installed in the housing of the stand with two test bearings, supporting 9 and two auxiliary bearings 17. The loading lever 11 is pivotally connected to the housing stand 8. Anchor 18 is pressed on the shaft 2, and a winding of the stator 19 of the asynchronous electric motor is installed in the housing 8. The loading lever 11 is rigidly connected to the screw adjusting mechanism 20 by means of a bolt and a nut 20. The latter is rigidly connected to a telescopic stand 21 having a spherical tip at the end pivotally connected to the load fork 22. The load fork 22 is mounted on the outer ring of the auxiliary bearing 17. At the end loading lever 11 suspended loads 23.

The eyelet 24 is mounted on the adjusting screw 25 with locknuts 26 and is fixed in the axial direction on the one hand by the thrust collar of the adjusting screw 25, and on the other, by the nut 27 (Fig. 4). An eye 24 through an adjusting screw 25 is connected to a telescopic stand 28. The latter includes an adjusting pin 29 and a lock nut 30. The pin 29 has a spherical tip (hinge) at the end, through which it connects to the load fork 22. The load fork has a landing pin under the tip of the adjustment pin place characteristic spherical shape (figure 5).

Method of use

The load on the bearings is changed using removable weights 23 (Fig.3). To move in the horizontal plane of the telescopic rack 27, pivotally connected to the load fork 22 is the adjusting screw 25 (figure 4) of the screw adjusting mechanism 30 (figure 3). The position of the adjusting screw 25 and the telescopic rack is fixed with locknuts 26 and nut 27 (Fig. 4).

To ensure radial load and minimize its axial component, the load fork is pivotally connected to the telescopic stand, and the length of the telescopic stand can be changed by the adjusting pin 29 (Fig. 4). The position of the pin 29 is fixed by a lock nut 30 (Fig. 4). The load created by the loads 23 is transferred to the load forks 23, auxiliary bearings 17, is transmitted to the shaft 2, and then to the inner rings of the tested bearings 9 (Fig.3).

Information sources

1. Liberman B.Ya. Testing machines for rolling bearings. - M.: Mechanical Engineering. 1965 .-- 152 p.

2. Kurchatnik VV Restoration of rolling bearings of agricultural machinery with polymer materials. - Diss ... doct. tech. sciences. - M., 1989 .-- 327 s.

Claims (1)

A stand for testing rolling bearings for durability under local loading, including a support frame, a housing mounted on it in the form of a cylinder and two bearing shields with a shaft mounted on it on 4 bearings - two tested and two auxiliary, two loading levers with loads connected pivotally with the stand body and creating a load on the rings of the tested bearings, characterized in that the loading lever through a telescopic stand with a spherical tip, a load fork and an auxiliary bearing IR creates a load on the shaft and the inner ring and then on the other parts of the bearing under test, and the shaft is rotated due to the fact that the shaft is an anchor and the body is a stator of an induction motor.

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