SU756250A1 - Stand for testing antifriction bearings - Google Patents

Description

The invention relates to testing machines, in particular to devices for testing bearings in sliding. _

A stand for testing ^of slide bearing ^3- spines is known, which contains a drive motor connected to the shaft, a mechanism for creating radial and axial loads, and a device. to measure the friction torque, the stop ring and the ring mounted on the outer surface of the bearing, rigidly connected to the crosshead. The traverse is pivotally connected to a cable pivotally connected to the axial loading unit.

The axial loading unit is made in the form of a cylinder with a spring-loaded stem located in it, connected to a cable 20. The cylinder is connected to a threaded rod mounted in a housing, on the end of which is a nut connected to the rod ZD.

The disadvantage of this design is that the axial loading system is carried out using a cable manually, which leads to errors in determining the friction torque of the tested bearings. thirty

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The purpose of the invention is to improve the accuracy of the test results of bearings.

This goal is achieved in that the stand containing a drive motor connected to the shaft, a mechanism for creating a radial load and a mechanism for creating an axial load, including a ring mounted for axial movement, connected to a spring-loaded traverse, kinematically connected with a hinged-mounted unit axial loading, as well as a device for measuring the friction torque, is provided with a hollow trunnion, cantilever-mounted on the shaft, and grooved guides are made at the cantilever end of the hollow trunnion In which it sets the traverse, wherein the trunnion is mounted within the hollow shaft of axial loading assembly, and the outer surface of the hollow trunnion installed ring.

FIG. 1 shows a stand for testing bearings; in fig. 2 shows a section of A. gA in FIG. one.

The stand for testing of bearings contains a frame 1, a drive motor 2 mounted on it with a tachogenerator 3,

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connected via a gear coupling 4 to the shaft 5, on which rolling bearings 6, 7 are located and cantilever reinforced with the help of bolts 8 through a bushing 9 and a key 10 on the shaft 5 a hollow trunnion 11. The heads of the bolts 8 are closed by a stop ring 12. Inside the hollow trunnion 11 is an axial loading unit consisting of a flange 13 attached to the shaft 5, to which a hydraulic cylinder 15 is connected through a hinge 14, which is interconnected through a hinge 16 to a cross member 18 spring-loaded with a spring 17 installed in end-to-end diameters Aulnay end of the hollow trunnion 11, the guide grooves 19. The yoke 18 is rigidly connected with the ring 20 sliding along the surface of the hollow stud 11 along its axis.

A hollow pin 11 with an axial loading unit and a ring 20 connected to the spring-loaded cross member 18 constitutes a mechanism for creating an axial load.

The test bearing 21 is located on the outer surface of the hollow journal 11 in the area between the stop ring 12 and the ring 20. Oil in the area of contact of the test bearing 21 with the hollow journal 1 is supplied from the pump 22, which is included in the mechanism for creating a radial load, including hydraulic cylinder 23, pump 24 Between the test bearing, the 21st piston 25 of the Cylinder 23 is mounted a shoe 26 and a sector cushion 27 of hydrostatic pressure. Oil is supplied to the hydro-support system from the pump 28. Between the frame 1, spring-loaded indicator dynamometers 30 are fixed by means of adjustable stops 29 and the sector cushion 27, designed to measure the friction torque directly on the test bearing 21.

The oil leaving the hydro-support is freely drained into the tray 31 and further into the tank 32.

Sensors 33, 34 are embedded in the hollow pin 11 to measure the thickness of the oil layer and the pressure in the oil layer of the test bearing 21, the wires from which are connected to the annular current collector 35, and the shields are connected to the recording equipment.

In the hydraulic cylinder 15, the oil is fed through the pipeline 36 through the hydraulic swivel 37 from the pump 38.

Stand for testing bearings works as follows. ·

Before testing the bearing 21, sensors 33, 34 are calibrated to measure the oil layer and the pressure in the oil layer. The test bearing 21 is mounted on the sector cushion 27 between the stop ring 12 and the ring 20 and is connected to the pump 22.

When this traverse 18 with the ring 20 is pressed by the spring 17 and is in the extreme right position of the guide groove 19 of the hollow trunnion 11. The pressure in the hydraulic cylinder 23 under the piston 25 is absent and the latter is in the lower position so that there is a gap between the bearing 21 and the hollow trunnion 11.

The shaft 5 with a hollow trunnion 11 is driven by the motor 2, the speed of which is controlled by a tachogenerator 3. The sensors 33, 34, embedded in the hollow trunnion 11, measure the thickness and pressure of the oil layer. Oil under pressure from the pump 22 is supplied to the bearing 21 and from the pump 24 to the hydraulic cylinder 23, and the piston 25 rises, creating a radial load on the test bearing 21. In order to create an axial load on the test bearing 21, it is necessary to turn on hydrostatic pressure between Shoe 26 and sector pillow 27 by supplying oil from the pump 28.

Next, the pump 38 and the oil under pressure is turned on through the hydraulic swivel 37 and the pipe 36 enters the hydraulic cylinder 15, by means of which the yoke 18 with the ring 20 moves to the left up to the stop in the test bearing 21 and further up to the stop in the stop ring 12, and in the contact zones bearing 21 with the thrust ring 12 and the ring 20, the oil is supplied under pressure from the pump 22.

Moving the test bearing 21 in the axial direction is due to the fact that the sector cushion 27, separated by an oil layer of hydrostatic support, slides along the surface of the shoe 26 and can float practically without resistance in the shoe 26.

Thus, the friction torque from the test bearing 21 is completely, without loss, transmitted to the spring indicator dynamometers 30, by which it is fixed.

Stand for testing bearings. slip avoids the use of manual labor when loading the bearing, which reduces the error in determining the moment of friction.

Claims (1)

Claim Stand for testing of bearings, containing a drive motor connected to the shaft, a mechanism for creating a radial load and a mechanism for creating an axial load, including a ring mounted with the possibility of axial five 756250 6 displacement, coupled with a spring-loaded cross member, kinematically connected with a pivotally mounted axial loading unit, as well as instrumentation equipment, characterized in that, in order to improve the test results, it is equipped with a hollow trunnion mounted on a shaft at the cantilever end the trunnions are made with guide grooves in which the cross bar is installed, while inside the hollow trunnion an axial loading unit is mounted on the shaft, and on the outer surface of the hollow trunnion 5 mounted ring.