CS226056B1 - Apparatus for testing dynamic load capacity and durability of antifriction bearings - Google Patents

Description

The invention relates to a device for testing the dynamic load-bearing capacity and durability of both radial and axial roller bearings, for which it addresses the reduction of the test time.

So far, the dynamic load bearing capacity and durability tests of rolling bearings have been carried out in devices which allow the load to be tested in a radial, axial or combined direction at constant speed until the bearing failure is detected on at least one of the bearings tested. After replacement of the damaged bearing, the test continues until the specified time, corresponding to the bearing life. The dynamic load-bearing capacity is determined from the loading, speed and durability conditions. Using conventional test machine speeds and the durability value determined by definition, the test time of a single bearing is up to 150 hours. At least 20 bearings must be tested for a comprehensive test. Although the current test equipment allows 4 bearings to be loaded at the same time, the statistical determination of the dynamic bearing capacity and durability of a certain type of rolling bearing requires a few weeks, which, among other things, excludes a false influence on the rolling bearing production.

The above mentioned problem is eliminated by the device for testing the dynamic bearing capacity and durability of rolling bearings according to the invention, which is based on the introduction of ultrasonic oscillations into the bearing component, such that 18 to 100 kHz, with simultaneous multiplication of a non-variable equivalent load in a radial or axial direction, at a constant speed, at selected temperature, lubrication, pressure, or corrosion loading conditions of one or a group of bearings.

The additional cyclic loading of the bearing material in the area of load transfer between relatively moving bearing parts at ultrasonic frequency allows up to 100-fold reduction in load time to bearing failure, and thus up to 100-fold reduction in time to determine the dynamic bearing capacity and durability of rolling bearings.

The accompanying drawings show two examples of an embodiment of a device for testing the dynamic load-bearing capacity and durability of the invention. 1 shows a device in which radial ultrasonic oscillations are fed to radial bearings, and FIG. 2 shows a device in which axial or a combination of radial and axial ultrasonic vibrations are fed to the thrust bearings.

In the device for testing the dynamic load-bearing capacity and durability of radial roller bearings according to the invention (Fig. 1) from one or two frequency and phase-matched converters 1, the ultrasound concentrate or concentrators 2 is concentrated into a contoured waveguide 3 having discs formed x to which the inner rings of the tested radial bearings 5 are pressed. The radial bearings are trapped by the outer rings in the load cases 6 and are subjected to an equivalent load F. The dimensions and characteristics of the transducers 1, concentrates 2, The disks 4 must meet the resonance condition so that the circuits of the disks 4 oscillate with the selected radial deflection amplitude. The rugged waveguide 3 may be in one piece or preferably divided. Its individual parts are connected in a detachable manner in the position x / 2. The size x is proportional to the half of the wavelength of sound in the material of the shape-shaped waveguide 3. The whole resonant system (1, 2, 3, 4) is rotated in bearings 7 by selected speed n, or the whole resonant system (1,2,3, 4) is The bearing sleeves can be carried out in the liquid medium stream from the pressure nozzle 8, with selected temperature and pressure parameters.

In the device for testing the dynamic load-bearing capacity and durability of thrust roller bearings according to the invention

Claims (4)

1. A device for testing the dynamic load-bearing capacity and durability of rolling bearings is characterized in that it comprises a rotationally or rigidly mounted ultrasonic resonance system formed at least from one ultrasonic transducer (1) connected to at least one concentrator (2) and a connected waveguide (3 ) having one to 10 discs (4) for the nisovanieradiene bearing (5) and a load case (6), or for supporting an axial bearing (9) and a load disc (10), the load case (6) or the load disc (10) are fixed or rotatably mounted. 2. Apparatus according to claim 1, characterized in that the 226056 (Fig. 2) of one or two frequency and phase-aligned transducers 1 is ultrasonically concentrated by a concentrator or concentrator 2 into a shaped waveguide 3 having a distance x formed by the discs 4 on which the rings of the tested axial bearings 9 are pressed sideways. The axial bearings are pressed against the load plate 10 on the other side by the selected equivalent load F. The dimensions and characteristics of the converters 1, the concentrators 2, the shaped waveguide 3, in particular the diameter of the discs 4 must switch the resonance condition so that the faces of the disks 4 oscillate with the selected amplitude of the deflection in the direction of the axis of the waveguide 3. The size x is proportional to the half-wavelength of the sound in the material of the shape-shaped waveguide 3. The entire resonant system (1,2,3,4) is rotated in bearings 7 selected by the speed n, or the resonance system is a nail The load discs 10 can be rotated in the flow of liquid medium from the pressure nozzle 8, with selected temperature and pressure parameters. The device for testing the dynamic load-bearing capacity of rolling bearings according to the invention can be used for multi-as well as one-bearing tests. According to the short test time, the device according to the invention can be operatively provided in the production guild for the bearing manufacturing technology and thus actively influence the quality of bearings production. SUMMARY OF THE INVENTION The ultrasonic resonance system consists of two-transducer transducers (1) with concentrators (2), between which a wave-shaped wave (3) is placed, the ultrasonic transducers being frequency and phase aligned. 2 In the apparatus for testing the dynamic load-bearing capacity of radial rolling bearings of the underlay (Fig. 1) from one or two frequency and phase-aligned converters 1, the ultrasonic concentrator or concentrators 2 concentrate into a shape-shaped waveguide 3 having the discs 4 formed at a distance x The radial bearings are outer rings that are fixed in the load cases 6 and act on an unselected equivalent load F. The dimensions and characteristics of the converters 1, the concentrates 2, the parts of the shaped waveguide 3, especially the diameter of the disks 4 must meet the resonance condition so that the circuits of the disks 4 oscillate with the selected amplitude radial deflection. The waveguide 3 may be formed in one piece or is preferably divided. The individual parts thereof are in the x / 2 position in a distinct manner. The size x is proportional to the half wave length of the sound in the material of the waveguide 3. The entire resonance system (1,2, 3, 4) is rotated in bearings 7 by the selected turns n, or the whole resonant system (1,2,3,4) is fixed and The load sleeves 6 are rotated by the selected speed n. The tests of the self-locking bearings are carried out in the flow of liquid medium from the pressure nozzle 8, with the selected temperature and pressure parameters. In the device for testing the dynamic load-bearing capacity of axial rolling bearings according to the invention 3. The device according to claim 1 and 2, characterized in that the shape-broken waveguide (3) has disassembled joints. 4. The device according to claim 3, characterized in that a pressure nozzle (8) is assigned to each disk (4) provided with the test piece (5, 9) for the purpose of supplying liquid medium with selected temperature and pressure parameters. 2 drawings