Bench for testing bearings

FIELD: testing of machine parts.

SUBSTANCE: bench comprises shaft with is provided with driving pulse turbine and is mounted in the housing provided with passages for supplying fluid to the turbine wheel and discharging it from the turbine and bearing to be tested provided with the coating to be tested. The bearing is mounted in the race mounted on the shaft of the pulse turbine and on flexible members. The bench is provided with loading device, temperature sensor, and pickup for measuring torque. The reference bearing is set in the race that is suspended inside the housing by means of flexible members. The driving pulse turbine is mounted on the shaft in its central part. The shaft is set on two bearing that receive the reference and tested bearings symmetrically to the pulse turbine. The loading device is connected to the bottom section of the races of the reference and tested bearings to provide the same load on both of the bearings. The separating heat screen is interposed between the turbine and tested bearing. The reference bearing may be additionally provided with heater and temperature sensor, and it may be provided with a tested coating. The structures of the tested and reference bearing may be the same, or different.

EFFECT: enhanced reliability and simplified structure.

4 cl, 3 dwg

 

The invention relates to the field of research performance coatings for friction pairs at the nodes of rotation, for example of a pair: a rotating shaft and a stationary blade element gasdynamic bearing or rotating shaft and a stationary sleeve, etc.

The invention allows to determine the comparative performance of the tested coatings in the pair of gas bearing, for example, in gas-dynamic radar bearing between the shaft and blade at different operating temperatures and loads in relation to "standard" well-known floor under standard conditions, for example, at 15°C.

Known stand, see the article "Some Composite Bearing and Seal Materials for Gas Turbine Arpplications - A Review. By sliney. E. Transections of the ASME, v.112 oct., pp.486-488, 1990, containing a rotating disk and a stationary finger, which form a pair of friction, heating element, electric feeder, universal joint.

The disadvantage of this stand is that the anti-wear properties of the coatings in a pair of friction are investigated on samples with simple lines that do not match the configuration of the friction pair of real structures thin flap element gas-dynamic bearing, undergoing in the process, mechanical and thermal deformation. Because the surface friction has a simple form, it is impossible to recalculate received the results on the real working conditions of the bearing in turbomachines dynamic processes, in transient modes start - stop.

Known stand adopted for the prototype, see "Performance and Durability of High Temperature Foil Air Bearings for Oil-Free Turbomachinary" C.Della Corte, V.Lukashevicz, M.J.Walco, H.Heshmat, NASA /TM-2000-209187/ REV1, pp.1, 3, 10, 2000, containing the test gas bearing, impulse air turbine, a drive shaft mounted on ball bearings, oil lubricated, heater, load device, a suspension system and a system for measuring torque.

The test coverage directly in the bearing design with the deformation of the elements taking place in the real conditions of his work.

The disadvantages of this stand are:

- the test is only one bearing;

- recalculations are obtained when the test results for comparison with test results of other pairs of friction;

structural complexity of the stand, which consists in the necessity to use a cantilever suspension system of the turbine rotor on ball bearings and systems for their oil.

The present invention is to increase the reliability of the test bearings with different coatings, simplifying the design of the stand for testing of bearings of different shapes and sizes.

The technical result is achieved in the DL stand the test bearings in simulated operating conditions, contains a shaft with a drive impulse turbine, which is installed in the housing with channels for supplying the working fluid to the turbine wheel and exhaust it from the turbine, the test bearing is coated with a test coating, mounted in a housing located on the shaft of the impulse turbine and provided with a heater, the ferrule of the test bearing is suspended inside the body of the elastic elements, in addition, the stand is equipped with a load device, a sensor and a sensor for measuring the torque, and stand in a control bearing mounted in a housing which is suspended inside the body of the elastic elements, while driving impulse turbine is located on the shaft in its middle part, which is mounted on two supports, inside of which is disposed symmetrically with respect to the impulse turbine are the control and the tested bearings, and a load device is connected to the lower part of the casing of the test and control bearings with equal load on both bearings, and between the turbine and the test bearing posted by dividing the heat shield.

Also check the bearing can be equipped with an additional heater and temperature sensor.

Also on the test bearing can be applied to the test surface.

Design Institute which has been created and control the bearings may be the same or different.

The invention consists in that the drive pulse turbine is installed on the shaft in its middle part and disposed symmetrically with respect to the impulse turbine are subject and control bearings (in the particular case of the same design and geometry). The stand is equipped with a load device, which is installed so that the load on the test and control bearings are the same, and the meter of torque. The test bearing is mounted within a housing which is suspended inside the body of the elastic elements, and equipped with a heater to provide the desired thermal profile. Condition monitoring is carried out using a sensor such as a thermocouple.

The technical result of the application of the test stand for testing bearings in simulated working conditions is the possibility of simultaneous comparative tests, for example, gas-dynamic bearings with different coatings in simulating conditions operating temperature in the support of the CCD, for example ˜500-600°and "normalized" conditions at t=15°and simplifying the design of the stand, because it does not require lubrication system oil.

The technical result is achieved by introducing new elements. These include the control bearing the same with the test bearing con is e.g., they are symmetrically placed in relation to the driving impulse turbine. This eliminates the need to install the drive impulse turbine for additional support with oil lubricated ball bearings, as shown in the prototype.

Stand for testing bearings in simulated operating conditions includes a housing with the shaft and drive impulse turbine, located in its middle part. The shaft is mounted on two bearings, in which are placed, for example, two gas bearing carried the same design and dimensions. On the friction surface of one of the bearings, for example the test bearing caused the subjects of the coating. The other bearing, the control has a "standard" coverage. The race of the test bearing with the test floor is equipped with a heater to heat the test bearing to the simulated operating temperature. The stand is equipped with a system of loading (load device), both bearing the same variable workload. The test and control bearings installed inside the casing for the elastic elements. The test bearing is separated from the drive pulse turbine heat shield.

The essence of the invention is illustrated by drawings.

Figure 1 shows a schematic longitudinal section of the proposed stand for holding the of spitoni bearings in simulated working conditions.

Figure 2 shows a cross section a-a of the stand 1.

Figure 3 shows the section b-B of the stand 1.

Stand for testing bearings in simulated operating conditions (see figure 1) includes a shaft 1 with a drive pulse turbine 2, the test bearing 3 and the control bearing 4. On the test bearing 3 test applied coating (not shown). The test bearing 3 provided with a heater 5. Drive impulse turbine 2 mounted on the shaft 1, the test and control bearings 3 and 4 are accommodated in the housing 6 and is installed in the holder 16. Ferrule 16 of each of the bearing 3 and 4 mounted inside the housing 6 on the elastic elements 8. The shaft 1 has a sensor 9 measuring torque. To the lower part of the shroud 16 both bearings 3 and 4 is connected to a load device 10. Ferrule 16 of the test bearing 3 provided with a sensor 11. On the test bearing 3 applied the test floor. In the housing 6 has a channel 12 (see figure 2) for supplying working fluid to the turbine wheel 2 and the channel 13 to output the working fluid from the turbine 2. The housing 6 of the test bearing 3 is separated from the turbine 2 heat shield 14. A working medium, for example compressed air, is fed through the channel 12 to the turbine wheel 2 in a pulsed mode in quantity and frequency, providing acceleration and stop-wheel drive impulse turbine 2 from the momentum in the run up to speed "ascent" of the shaft 1, which yields the carrier gas film in the test bearing 3 and disappears dry friction in the test bearing 3 and disappears dry friction in the studied pair of surfaces.

Stand for testing bearings in simulated working conditions works as follows.

On the shaft 1 turbine 2 set, for example, gas bearings 3 and 4, respectively, the subject and control. Using load device 10 sets the desired value of the load on both bearings 3 and 4. Due to the symmetry of the design load on both bearings 3 and 4 are the same. A heater 5 and set the desired thermal condition of the parts of the test bearing 3, which is controlled using the temperature sensor 11. Then fed compressed air motor impulse turbine 2. During the rotation of the drive pulse turbine 2 dry friction occurs at the contact pair, for example, the test bearing 3, which leads to wear of the test coverage at the site of contact. With increasing rotation frequency of the drive pulse turbine 2 increases the lift force in Klenova the air gap between the blade 15 (3) of the test bearing 3 and the shaft 1. When reaching the lifting force of magnitude equal to the magnitude of the applied load device 10, shaft 1 "POPs up", i.e. it achieved the speed of ascent" and so is maintaining or further increasing the frequency of rotation of the wear coating in a pair of contact ends. When disconnecting supply working fluid to drive impulse turbine 2, the frequency of its rotation is reduced, the air wedge disappears and re-emerges dry friction in a pair of contact. Tests of the test bearing 3 with the test coverage for this program changes the frequency of the rotation continues until, until you reach the planned number of cycles "start-stop" or wear the surface of the investigated pairs of friction reaches the base material of the bearing.

Test results of the wear test coverage for test bearing 3 is compared with the wear obtained on the test bearing 4 at standard temperature, which can be selected, for example, t=15°C.

If necessary, control the bearing 4 can be additionally equipped with its own heater. On the test bearing can be applied to the test surface. In this case, it becomes possible to conduct comparative tests 2 different combinations of the tested coatings in the pair under the same conditions for bearings on load and temperature.

The table below shows examples of comparison of the test results.

Table
The bearing coverTemperature, °/td> Static load, kPaWear petal/shaft, mcmThe number of cycles
the subject, floor No. 1650the 10.118/530000
control, floor No. 115the 10.110/2030000
control, floor No. 1427the 10.118/7,630000

The invention allows to determine the comparative performance of the tested coatings in a pair of friction, for example a gas bearing, for example, in gas-dynamic radar - between the shaft and blade, at different operating temperatures and loads in relation to "standard" well-known floor under standard conditions, for example at 15°C.

Application of the proposed stand for testing bearings in simulated operating conditions allows to carry out comparative tests of bearings with different coatings in support of the CCD increases the accuracy and reliability of the results of tests and simplifies the construction of the booth.

1. Stand for testing bearings in simulated working conditions, containing a shaft with a drive impulse turbine, which is installed in case the channel for supplying the working fluid to the turbine wheel and exhaust it from the turbine, the test bearing is coated with a test coating, mounted in a housing located on the shaft of the impulse turbine and provided with a heater, the ferrule of the test bearing is suspended inside the body of the elastic elements, in addition, the stand is equipped with a load device, a sensor and a sensor for measuring the torque, characterized in that it introduced the control bearing mounted in a housing which is suspended inside the body of the elastic elements, while driving impulse turbine is located on the shaft in its middle part, which is mounted on two supports, inside of which is disposed symmetrically with respect to the impulse turbine are the control and the test bearings, and a load device is connected to the lower part of the casing of the control and the test bearings with equal load on both bearings, and between the turbine and the test bearing posted by dividing the heat shield.

2. The stand according to claim 1, characterized in that the control bearing is further provided with a heater and temperature sensor.

3. The stand according to claim 1, characterized in that the control bearing caused the test floor.

4. The stand according to claim 1, characterized in that the design of the test and control bearings may be the same or different.



 

Same patents:

FIELD: test equipment; engine construction.

SUBSTANCE: method can be used for optimization of operation of crankshaft of internal combustion engine lubrication system. According to the method, during critical modes of operation of internal combustion engines, oil discharge through connecting rod and main bearings of crankshaft is measured. When measuring oil discharge through main bearing, oil channel of connecting rod bearing is plugged. When measuring oil discharge through connecting rod bearing, oil channel of main bearing is plugged. Amount of oil pumped through main bearing should equal or be bigger than amount of oil pumped through connecting rod bearing of crankshaft. Precision of estimation is provided to prevent non-uniform wearing of connecting rod and main bearings caused by pauperization of lubricant for numbers of cylinders at all exploitation modes till complete work-out of engine's motor resource.

EFFECT: improved reliability of estimation.

2 dwg

FIELD: the invention refers to the field of electrotechnique and may be used in industry and agriculture for carrying out stand testing of the bearings of electric engines.

SUBSTANCE: stand for testing bearings of electric engines on longevity has a bed with an opening for passing the rod of a stretched arrangement, pillars with fixed in them rotating centers and a tested engine. An eccentric is fastened on the shaft of the tested electric engine. It consists of two plates fixed between each other and from the inner side having cut-outs in which inserts are placed. From the outer side pins with carving are fastened to the plates. On each pin a balancing element is stringed whose position can be fixed.

EFFECT: creation of regulated rotating radial loading impacting on the bearings of the shaft of the electric engine, suitability to test electric engines of various dimensions.

4 cl, 2 dwg

FIELD: testing engineering.

SUBSTANCE: method comprises accelerating rotor, applying load to the bearing from the side of the rotor, cutting off the drive of the engine, free breaking of the rotor, and measuring the speed of rotation of the rotor and moment of friction of the rotor in the bearing. When the friction moment begins to rise, the load reduces, and the measurements are carried out up to the start of the next rising of the friction moment. The speed of rotation of the rotor at which the friction moment begins to rise is assumed to be the rate of fitting the rotor for a given loading .

EFFECT: expanded functional capabilities.

2 dwg

FIELD: the invention may be used on railway transport for diagnostics of bearings of different rotor mechanism changing while working orientation in space.

SUBSTANCE: the essence of the invention is in systematization of information about vibrations in different positions of a rotor mechanism and its displacement to a chosen position. The measuring device has an identifier of minimum information incoming from vibration detectors, a tilt manipulator and an automatic multi-channel scheme of measuring and controlling of the tilt manipulator. On the tilt manipulator a rotor mechanism is fixed. The measuring device allows to determine the characteristic of a magnitude of vibrations bringing by the tilt of an axis of rotating or by defects at changing orientation of the rotor mechanism.

EFFECT: defined characteristic of the magnitude of vibrations is used for making choice of a position enabling least resistance to rotation of a rotor mechanism or having least vibrations deflection of norm.

5 cl, 1 dwg

FIELD: testing engineering.

SUBSTANCE: method comprises exciting forced oscillations in the article, changing the frequency of forced oscillations until resonance oscillations occur, measuring parameters, and determining the duration of service life from the correlation dependence for a given type of article. Before exciting oscillations, the article is insulated from the exciting system. During the resonance oscillations the potential difference of static electricity between the article surface and ground is measured.

EFFECT: enhanced reliability of testing.

1 dwg

FIELD: mechanical engineering.

SUBSTANCE: method includes assembling bearings using races with random permissible deviations of sizes of outer race ΔD, inner race Δd, distance between ways in the outer race ΔH, distance between the race way and base face Δh in the inner race, which are measured at the sites of nominal contact angle β0, and measuring the axial clearance S and radial clearance P in the assembled bearing. The radial space is measured in each ball row in the section passing through the nominal position of the ball centers. The measurement are used for determining contact angle β. The value is compared with the permissible value.

EFFECT: prolonged service life.

5 cl, 1 dwg

The invention relates to the field of engineering, in particular to installations for testing motor-axial bearings of the locomotive under the effect of impact loads, and can be used for testing of rolling bearings and plain bearings operating under conditions of dynamic loading

The invention relates to the field of mechanical engineering

The invention relates to the field of engineering and bearing industry and can be used for bearing diagnostics in power, oil, chemical, oil refining industry and transport for operational control of bearing wear condition

The invention relates to vibroacoustic diagnostics of turbomachines, mainly misalnya bearings shaft of aircraft gas turbine engines

FIELD: mechanical engineering.

SUBSTANCE: method includes assembling bearings using races with random permissible deviations of sizes of outer race ΔD, inner race Δd, distance between ways in the outer race ΔH, distance between the race way and base face Δh in the inner race, which are measured at the sites of nominal contact angle β0, and measuring the axial clearance S and radial clearance P in the assembled bearing. The radial space is measured in each ball row in the section passing through the nominal position of the ball centers. The measurement are used for determining contact angle β. The value is compared with the permissible value.

EFFECT: prolonged service life.

5 cl, 1 dwg

FIELD: testing engineering.

SUBSTANCE: method comprises exciting forced oscillations in the article, changing the frequency of forced oscillations until resonance oscillations occur, measuring parameters, and determining the duration of service life from the correlation dependence for a given type of article. Before exciting oscillations, the article is insulated from the exciting system. During the resonance oscillations the potential difference of static electricity between the article surface and ground is measured.

EFFECT: enhanced reliability of testing.

1 dwg

FIELD: the invention may be used on railway transport for diagnostics of bearings of different rotor mechanism changing while working orientation in space.

SUBSTANCE: the essence of the invention is in systematization of information about vibrations in different positions of a rotor mechanism and its displacement to a chosen position. The measuring device has an identifier of minimum information incoming from vibration detectors, a tilt manipulator and an automatic multi-channel scheme of measuring and controlling of the tilt manipulator. On the tilt manipulator a rotor mechanism is fixed. The measuring device allows to determine the characteristic of a magnitude of vibrations bringing by the tilt of an axis of rotating or by defects at changing orientation of the rotor mechanism.

EFFECT: defined characteristic of the magnitude of vibrations is used for making choice of a position enabling least resistance to rotation of a rotor mechanism or having least vibrations deflection of norm.

5 cl, 1 dwg

FIELD: testing engineering.

SUBSTANCE: method comprises accelerating rotor, applying load to the bearing from the side of the rotor, cutting off the drive of the engine, free breaking of the rotor, and measuring the speed of rotation of the rotor and moment of friction of the rotor in the bearing. When the friction moment begins to rise, the load reduces, and the measurements are carried out up to the start of the next rising of the friction moment. The speed of rotation of the rotor at which the friction moment begins to rise is assumed to be the rate of fitting the rotor for a given loading .

EFFECT: expanded functional capabilities.

2 dwg

FIELD: the invention refers to the field of electrotechnique and may be used in industry and agriculture for carrying out stand testing of the bearings of electric engines.

SUBSTANCE: stand for testing bearings of electric engines on longevity has a bed with an opening for passing the rod of a stretched arrangement, pillars with fixed in them rotating centers and a tested engine. An eccentric is fastened on the shaft of the tested electric engine. It consists of two plates fixed between each other and from the inner side having cut-outs in which inserts are placed. From the outer side pins with carving are fastened to the plates. On each pin a balancing element is stringed whose position can be fixed.

EFFECT: creation of regulated rotating radial loading impacting on the bearings of the shaft of the electric engine, suitability to test electric engines of various dimensions.

4 cl, 2 dwg

FIELD: test equipment; engine construction.

SUBSTANCE: method can be used for optimization of operation of crankshaft of internal combustion engine lubrication system. According to the method, during critical modes of operation of internal combustion engines, oil discharge through connecting rod and main bearings of crankshaft is measured. When measuring oil discharge through main bearing, oil channel of connecting rod bearing is plugged. When measuring oil discharge through connecting rod bearing, oil channel of main bearing is plugged. Amount of oil pumped through main bearing should equal or be bigger than amount of oil pumped through connecting rod bearing of crankshaft. Precision of estimation is provided to prevent non-uniform wearing of connecting rod and main bearings caused by pauperization of lubricant for numbers of cylinders at all exploitation modes till complete work-out of engine's motor resource.

EFFECT: improved reliability of estimation.

2 dwg

FIELD: testing of machine parts.

SUBSTANCE: bench comprises shaft with is provided with driving pulse turbine and is mounted in the housing provided with passages for supplying fluid to the turbine wheel and discharging it from the turbine and bearing to be tested provided with the coating to be tested. The bearing is mounted in the race mounted on the shaft of the pulse turbine and on flexible members. The bench is provided with loading device, temperature sensor, and pickup for measuring torque. The reference bearing is set in the race that is suspended inside the housing by means of flexible members. The driving pulse turbine is mounted on the shaft in its central part. The shaft is set on two bearing that receive the reference and tested bearings symmetrically to the pulse turbine. The loading device is connected to the bottom section of the races of the reference and tested bearings to provide the same load on both of the bearings. The separating heat screen is interposed between the turbine and tested bearing. The reference bearing may be additionally provided with heater and temperature sensor, and it may be provided with a tested coating. The structures of the tested and reference bearing may be the same, or different.

EFFECT: enhanced reliability and simplified structure.

4 cl, 3 dwg

FIELD: testing engineering.

SUBSTANCE: method comprises rotating one of the races of a lubricated bearing with the operational speed, circulation radial loading of the race to be tested with operation speed, and loading the untested race locally.

EFFECT: enhanced reliability.

4 dwg

FIELD: mechanical engineering.

SUBSTANCE: bench comprises mechanism for impact radial and axial loading provided with cams provided with radial and face steps that cooperate with the spring-loaded hummers set in the housing of boxes.

EFFECT: enhanced reliability.

1 dwg

FIELD: testing engineering.

SUBSTANCE: bench comprises tank that is filled with the testing fluid and receives testing unit provided with the friction pair to be tested. The friction pair is made of inner member mounted on the end section of the shaft of the testing unit connected with the driving shaft and outer member secured in the member connected with the device for producing radial effort. The first end section of each axle is set in the member for receiving the outer member of the friction pair to be tested, and the second end section of the first axle is set in the vertical wall of the tank filled with the testing fluid. The tank filled with the testing fluid is mounted inside the vertical frame on the table that is connected with the lifting mechanism.

EFFECT: enhanced reliability.

1 cl, 2 dwg

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