CN106706319B - Cylindrical roller bearing birotor testing machine shafting structure - Google Patents

Abstract

A shaft system structure of a cylindrical roller bearing double-rotor testing machine, which is arranged inside the bearing testing machine, including the rotor shaft of the inner ring and the rotor shaft of the outer ring. The test bearing is fixedly sleeved on the test end of the rotor shaft of the inner ring. Set in the inner hole of the test end of the outer ring rotor shaft, the inner ring rotor shaft is also sleeved with the first support bearing group and the radial loading bearing; the outer ring rotor shaft is also sleeved with the test bearing and the second support bearing group; The accompanying test bearing and the radially loaded bearing are symmetrical about the test bearing, and the second supporting bearing group and the first supporting bearing group are symmetrical about the testing bearing; the first supporting bearing group and the second supporting bearing group both include two angular contact bearings arranged side by side , one of which is close to the test bearing is a support bearing, and the other is an axially loaded bearing, and a spacer is also arranged between the support bearing and the axially loaded bearing. The invention has a scientific structure, can effectively increase the test rotation speed, and has a wide range of applications.

Description

Shafting structure of a cylindrical roller bearing double rotor testing machine

technical field

The invention relates to a shafting structure of a bearing testing machine, in particular to a shafting structure of a cylindrical roller bearing double-rotor testing machine.

Background technique

Bearings are key basic components in the manufacture of various equipment, and their quality directly determines the performance, reliability and life of the equipment; due to the harsh working environment and complex load conditions of the bearings, it must be long enough or even The whole life cycle of equipment is maintenance-free, etc. During the design, development and manufacturing process, the bearing must be verified on the testing machine for the corresponding simulated working conditions to provide reliable test data for research, design, manufacture and use, and for the bearing. Design, manufacture and use provide the basis. The R&D, design, manufacture and testing technology of high-temperature and high-speed precision inter-axial bearings are mainly monopolized by a few foreign multinational companies. The research and development of such testing machines in my country began in the 1970s and 1980s. Restricted by other factors, the inner and outer diameters of test bearings are limited to medium and small sizes, and the limit speed is also low, which cannot meet the test requirements of large diameter, high temperature and high speed inter-shaft bearings.

Most of the existing bearing testing machines adopt a single shaft structure, and the shaft is connected with the inner ring or outer ring of the test bearing. The simulation test of the bearing rotation and loading form can be easily realized on the testing machine, but this kind of bearing test The machine has many deficiencies. Because it can only be fixed with the inner ring or the outer ring, when the test bearing needs the inner ring and the outer ring to rotate at the same time, the testing machine is not applicable. Although there are also some dual-rotor testing machines that can rotate the inner and outer rings of the bearing simultaneously for testing, they can generally only test small-diameter, low-speed bearings, and cannot test large-diameter, high-speed, high-oil working environment bearings.

In the bearing test, the test speed is a very important parameter. The test machine in the prior art is limited by the design and manufacture level of the shaft system and the structural form of the loading device. The rings rotate at the same time, high temperature and high speed running bearings.

Contents of the invention

In order to solve the deficiencies in the prior art, the present invention provides a shaft system structure of a cylindrical roller bearing double-rotor testing machine that has a scientific structure, can effectively increase the test speed, and can test the outer ring and the inner ring at the same time.

In order to achieve the above object, the specific scheme adopted by the present invention is:

A cylindrical roller bearing double-rotor testing machine shafting structure, set inside the bearing testing machine, including the inner ring rotor shaft and the outer ring rotor shaft, the test bearing is fixedly sleeved on the test end of the inner ring rotor shaft, and the outer ring pressure It is arranged in the inner hole of the test end of the outer ring rotor shaft, and the inner ring rotor shaft is also sleeved with a first support bearing group and a radially loaded bearing, and the radially loaded bearing is located between the first support bearing group and the test bearing; The outer ring rotor shaft is also set with a test bearing and a second support bearing group; the test bearing and the radially loaded bearing are symmetrical about the test bearing, and the second support bearing group and the first support bearing group are about the test bearing Symmetry; the first supporting bearing group and the second supporting bearing group include two angular contact bearings arranged side by side, one of which is close to the test bearing is a supporting bearing, and the other is an axially loaded bearing. A spacer is also arranged between the loading bearings.

The fixed sleeve on the test end of the rotor shaft with the inner ring is provided with an under-ring lubricating sleeve, and the test bearing is sleeved on the under-ring lubricating sleeve, and its inner ring passes through the shaft shoulder structure and short steps set on the outer wall of the under-ring lubricating sleeve. The sleeve is axially limited and fixed; the test end of the outer ring rotor shaft is also fixedly connected with a test bearing pressure ring, and the test bearing pressure ring axially limits the outer ring of the test bearing.

The radially loaded bearing is a cylindrical roller bearing, the inner ring of which is axially limited by the shaft shoulder and the second stepped sleeve, and the outer ring is fixedly connected with a radially loaded bearing seat; The side is also fixedly connected with a radially loaded bearing oil distribution plate, which provides lubricating oil and gas to the radially loaded bearing, and axially limits the outer ring of the radially loaded bearing; the radially loaded bearing seat There is also a groove in the upper part of the groove, and a buffer pad is arranged in the groove.

The accompanying test bearing is a cylindrical roller bearing, the inner ring of which is axially limited by the step sleeve through the shaft shoulder, and the outer ring is fixedly connected with the accompanying test bearing seat, and the accompanying test bearing oil distribution device is also arranged on the side of the accompanying test bearing. The oil distribution plate of the accompanying test bearing is fixedly connected with the accompanying test bearing seat to provide lubricating oil for the accompanying test bearing; there are also pressure rings A and B respectively on both sides of the accompanying test bearing seat, both of which are connected with the testing machine. The body is fixedly connected, and is used to limit the axial position of the test bearing seat.

The outer ring of the support bearing is fixedly connected to the fixed pressure plate of the angular contact bearing, and the outer ring of the axially loaded bearing is fixedly connected to the floating pressure plate of the angular contact bearing; an angular contact bearing oil-air lubrication is also provided between the two angular contact bearings Oil distribution plate, angular contact bearing oil-air lubrication The oil distribution plate is fixed on the fixed pressure plate of the angular contact bearing and is provided with two-way nozzles, and the two-way nozzles face the supporting bearing and the axially loaded bearing respectively.

The side of the angular contact bearing fixed pressure plate close to the test bearing is also fixedly connected with an angular contact bearing pressure ring, and the angular contact bearing pressure ring is fixedly connected with the body of the testing machine to limit the axial position of the angular contact bearing fixed pressure plate.

The side of the floating pressure plate of the angular contact bearing facing away from the fixed pressure plate of the angular contact bearing is embedded with a pressure ring for bearing axial load. For the sensor, a guide pin is installed in the guide wire hole of each pressure sensor, and the guide pin is arranged through the inside of the floating pressure plate of the angular contact bearing and the fixed pressure plate of the angular contact bearing.

The floating pressure plate of the angular contact bearing is also provided with a linear bearing and a cage.

Beneficial effect:

1. The present invention adopts the combination of supporting bearings and axial loading bearings, which can automatically adjust the axial loading force of the supporting bearings as the test speed changes, so as to realize the automatic adjustment and matching of the supporting bearing stiffness in the full working speed range of the shaft system ;

2. With the double rotor structure, it is possible to carry out one-way same-speed rotation test, one-way different-speed rotation test, two-way same-speed rotation test or two-way different-speed rotation test for the inner and outer rings of the test bearing. The test method is flexible and the application range is wide;

3. In the radial loading link, the load is transmitted through the buffer pad, which can reduce the friction during the loading process and the vibration of the inner ring rotor shaft;

4. Each test bearing adopts the method of oil-air lubrication, which has a good lubrication effect and can still meet the lubrication requirements under high-speed rotation, and the amount of lubricating oil used is relatively low, and the distance between the test bearing and the test machine body is uniform. The transition tooling is used for connection. When replacing the test bearing, only the corresponding transition tooling needs to be replaced, which reduces the test cost;

5. The test bearing is set on the rotor shaft of the inner ring through the transition sleeve composed of the lubricating sleeve under the ring and the stepped sleeve. For bearings with different inner diameters, the test can be carried out only by replacing the corresponding transition sleeve without replacing the rotor shaft, which reduces the The complexity of the test reduces the cost of the test.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure;

Fig. 2 is a structural schematic diagram of the supporting bearing group and connected parts;

Figure 3 Schematic diagram of the test bearing, radially loaded bearing, accompanying test bearing and the components connected to each bearing.

Reference signs: 1. Inner ring rotor shaft, 2. First stepped sleeve, 3. Spacer sleeve, 4. Angular contact bearing floating pressure plate, 5. Angular contact bearing oil-air lubrication oil distribution plate, 6. Linear bearing, 7. Angular contact bearing fixed pressure plate, 8. Angular contact bearing pressure ring, 9. Guide pin, 10. Second step sleeve, 11. Radial loading bearing oil distribution plate, 12. Radial loading bearing seat, 13. Lubrication under the ring Set, 14. Short step sleeve, 15. Test bearing pressure ring, 16. Outer ring rotor shaft, 17. Pressure ring A, 18. Accompanying test bearing seat, 19. Pressure ring B, 20. Vibration sensor bracket, 21. Test Bearing, 22, radially loaded bearing, 23, accompanying test bearing, 24, buffer pad, 25, accompanying test bearing oil distribution plate, 26 first support bearing group, 27, second support bearing group, 28, pressure ring, 29. Pressure sensor.

Detailed ways

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3 , a shafting structure of a cylindrical roller bearing double rotor testing machine is arranged inside the bearing testing machine, including an inner ring rotor shaft 1 and an outer ring rotor shaft 16 . On the test end of the inner ring rotor shaft 1, the fixed sleeve is provided with an under-ring lubricating sleeve 13, and the outer wall of the under-ring lubricating sleeve 13 is provided with a shaft shoulder structure. The test bearing 21 is set on the under-ring lubricating sleeve 13, and the inner ring It is axially limited and fixed by the shoulder structure and the short stepped sleeve 14, and the short stepped sleeve 14 is arranged on the side of the test bearing 21 close to the rotor shaft 16 of the outer ring. The outer ring of the test bearing 21 is press-set in the inner hole of the test end of the outer ring rotor shaft 16, and the test end of the outer ring rotor shaft 16 is also fixedly connected with a test bearing pressure ring 15. The test bearing pressure ring 15 presses the outer ring of the test bearing 21. Ring axial limit. The test bearing pressure ring 15 is fixed on the test end of the outer ring rotor shaft 16 by 10 M6*20 bolts and spring washers evenly distributed along the circumferential direction. The transition sleeve composed of the under-ring lubricating sleeve 13 and the short stepped sleeve 14, for different types of test bearings 21, only needs to replace the corresponding transition sleeve to match the inner diameter of the test bearing 21, and the test can be carried out without replacing the rotor shaft, which is convenient Fast and cost-effective.

The inner ring rotor shaft 1 is also sleeved with a first support bearing group 26 and a radially loaded bearing 22, and the radially loaded bearing 22 is located between the first support bearing group 26 and the test bearing 21; the outer ring rotor The shaft 16 is also sleeved with a test bearing 23 and a second support bearing group 27; the test bearing 23 and the radially loaded bearing 22 are symmetrical about the test bearing 21, and the second support bearing group 27 and the first support bearing group 26 Symmetrical about the test bearing 21 .

The radially loaded bearing 22 is a cylindrical roller bearing, the inner ring of which is axially limited by the shoulder provided on the inner ring rotor shaft 1 and the second stepped sleeve 10, and the second stepped sleeve 10 is arranged on the radially loaded bearing 22 is close to the side of the first supporting bearing set 26 . The outer ring of the radially loaded bearing 22 is press-fitted in the inner hole of the radially loaded bearing seat 12, and a radially loaded bearing oil distribution plate is fixedly connected to the side of the radially loaded bearing seat 12 close to the first supporting bearing group 26 11. The connection method is fixed by 10 M8*30 bolts and spring washers. The radial load bearing oil distribution plate 11 is used to provide lubricating oil and gas to the radial load bearing 22 and limit the axial position of the outer ring of the radial load bearing 22. , The lubrication method adopts oil-air lubrication, which can improve the lubrication effect, reduce the friction and heat of the radially loaded bearing 22, effectively improve the high-speed rotary motion accuracy of the shaft system, and prolong the service life of the testing machine. The left end of the radially loaded bearing oil distribution plate 11 is provided with a plurality of oil inlet holes, and each oil inlet hole is connected to an oil channel arranged radially inside the oil distribution plate, and the other end of the oil channel is connected to an oil nozzle. The grease nozzle sprays lubricating oil air to the radially loaded bearing 22 . The multi-input and multi-outlet oil-air path design not only enables each nozzle to spray equal-pressure lubricating oil and gas, but also enables the lubricating oil and gas to act on the radially loaded bearing 22 evenly. The top of the radially loaded bearing seat 12 is also provided with a buffer pad 24. When testing, a radially loaded device is arranged above the radially loaded bearing seat 12, and the radially loaded device puts the load time on the buffer pad 24, Further, a radial load is applied to the test bearing 21 through the radially loaded bearing seat 12 , the radially loaded bearing 22 and the inner ring rotor shaft 1 in sequence. By setting the buffer pad 24, the radial loading process has a shock-absorbing and wear-resistant link, which can prevent errors in the collection and measurement of the loading force signal due to vibration, and effectively avoid the impact of vibration outside the shaft system on the shaft system.

The accompanying test bearing 23 is a cylindrical roller bearing, the inner ring of which is axially limited by a stepped sleeve, and the outer ring is fixedly connected with the accompanying test bearing seat 18, and an accompanying test bearing fitting is also arranged on the side of the accompanying test bearing 23. The oil pan 25 and the test bearing oil distribution plate 25 are fixedly connected with the test bearing housing 18 for providing lubricating oil and gas to the test bearing 23 . In order to limit the axial position of the accompanying bearing seat 18, a first gland is arranged on the upper part of the accompanying test bearing, and the first gland is fixed on the body of the testing machine, and pressure rings A17 are respectively arranged at the left and right ends of the accompanying test bearing seat 18 And pressure ring B19, pressure ring A17 and pressure ring B19 are fixedly connected with the first gland and the body of the testing machine respectively, and the axial limit of the test bearing seat 18 is connected through 6 M10*20 bolts and spring washers fixed. If you want to replace different types of accompanying bearings 23, you only need to replace the transition set tooling formed by the accompanying bearing seat 18 and the accompanying bearing oil distribution plate 25, and the test can be carried out without changing the overall fixed structure of the testing machine. Meet a variety of different test conditions.

The first supporting bearing group 26 and the second supporting bearing group 27 both include two angular contact bearings arranged side by side, one of which is close to the test bearing 21 is a supporting bearing, and the other is an axially loaded bearing. A spacer 3 is also arranged between the loading bearings. The outer ring of the support bearing is fixedly connected to the fixed pressure plate 7 of the angular contact bearing through 32 M8*20 bolts and spring washers, and the outer ring of the axially loaded bearing is floating with the angular contact bearing through 32 M8*20 bolts and spring washers The pressure plate 4 is fixedly connected. An angular contact bearing oil-air lubrication oil distribution plate 5 with two-way nozzles is also arranged between the two angular contact bearings. The oil-air lubrication oil distribution plate 5 of the angular contact bearings is fixed on the fixed pressure plate 7 of the angular contact bearing. The raceways of bearings and axially loaded bearings are sprayed with lubricating oil and air. A second gland is also arranged on the upper part of the fixed pressure plate 7 of the angular contact bearing and the floating pressure plate 4 of the angular contact bearing, and the second gland is fixedly connected with the body of the testing machine. The right end of the second gland is also provided with an angular contact bearing pressure ring 8, and the angular contact bearing pressure ring 8 adopts 18 M8*20 bolts and spring washers to be fixedly connected with the second gland, the testing machine and the body, and then the corner The side of the contact bearing fixed pressure plate 7 close to the rotor shaft 16 of the outer ring is axially limited. The floating pressure plate 4 of the angular contact bearing is slidingly connected with the second gland through the linear bearing 6 and its cage, so as to reduce the friction between the floating pressure plate 4 of the angular contact bearing and the second gland, and improve the overall rigidity. Because the cylindrical roller bearing does not bear axial load during operation, the fixed pressure plate 7 of the angular contact bearing needs to be axially limited during the test, so as to ensure that the supporting bearing does not shift in the axial direction and prevent the rotor shaft from Axial movement occurs under the action of the supporting bearing, which causes the inner and outer rings of the test bearing 21 to be disengaged.

The side of the floating pressure plate 4 of the angular contact bearing facing away from the fixed pressure plate 7 of the angular contact bearing is embedded with a pressure bearing ring 28, and an axial loading device is arranged on the outside of the pressure bearing ring 28, and the axial loading device outputs axial load And applied to the bearing ring 28, and then through the floating pressure plate 4 of the angular contact bearing, the axially loaded bearing and the spacer 3 to apply load to the supporting bearing in turn. Compared with the traditional support method using a single bearing, the loading force can be flexibly adjusted according to the rotational speed, so that the stiffness of the supporting bearing can be automatically adjusted following the rotational speed, so as to achieve the purpose of increasing the test rotational speed. Several pressure sensors 29 are also arranged on the side of the pressure bearing ring 28 away from the test bearing 21. During the test, there are preferably 3 pressure sensors 29, and the sum of the pressure values measured by each pressure sensor 29 is the axial load. Axial load at the output of the device. The guide wire hole of each pressure sensor 29 is equipped with a guide pin 9 of hollow structure, and the guide pin 9 is arranged through the inside of the fixed pressure plate 7 of the angular contact bearing, and one end is fixed on the floating pressure plate 4 of the angular contact bearing by threads. Among them, the guide pin 9 not only completes the guide installation of the floating pressure plate 4 of the angular contact bearing and the fixed pressure plate 7 of the angular contact bearing, but also is used to lead out the guide line of the pressure sensor 29.

Claims (8)

1. The utility model provides a cylindrical roller bearing birotor testing machine shafting structure, sets up inside the bearing testing machine, including inner circle rotor shaft (1) and outer lane rotor shaft (16), fixed cover of experimental bearing (21) is established at the experimental end of inner circle rotor shaft (1), and its characterized in that is established in the hole of outer lane rotor shaft (16) experimental end to its outer lane pressure:

the inner ring rotor shaft (1) is further sleeved with a first supporting bearing group (26) and a radial loading bearing (22), and the radial loading bearing (22) is located between the first supporting bearing group (26) and the test bearing (21); the outer ring rotor shaft (16) is also sleeved with a test-accompanying bearing (23) and a second supporting bearing group (27); the test-accompanying bearing (23) and the radial loading bearing (22) are symmetrical about the test bearing (21), and the second supporting bearing group (27) and the first supporting bearing group (26) are symmetrical about the test bearing (21);

the first supporting bearing group (26) and the second supporting bearing group (27) respectively comprise two angular contact bearings which are arranged in parallel, wherein one of the two angular contact bearings close to the test bearing (21) is a supporting bearing, the other one of the two angular contact bearings is an axial loading bearing, and a spacer bush (3) is arranged between the supporting bearing and the axial loading bearing.

2. The cylindrical roller bearing dual-rotor testing machine shafting structure of claim 1, wherein: a lower annular lubricating sleeve (13) is fixedly sleeved on the test end of the inner ring rotor shaft (1), the test bearing (21) is sleeved on the lower annular lubricating sleeve (13), and the inner ring of the test bearing is axially limited and fixed through a shaft shoulder structure arranged on the outer wall of the lower annular lubricating sleeve (13) and the short stepped sleeve (14); the test end of outer lane rotor shaft (16) still fixedly connected with test bearing clamping ring (15), test bearing clamping ring (15) is spacing with the outer lane axial of test bearing (21).

3. The cylindrical roller bearing double-rotor testing machine shafting structure of claim 1, wherein: the radial loading bearing (22) is a cylindrical roller bearing, the inner ring of the radial loading bearing is axially limited by a shaft shoulder and a second step sleeve (10), and the outer ring of the radial loading bearing is fixedly connected with a radial loading bearing seat (12); a radial loading bearing oil distribution disc (11) is fixedly connected to one side, far away from the test bearing (21), of the radial loading bearing seat (12), and the radial loading bearing oil distribution disc (11) provides lubricating oil gas for the radial loading bearing (22) and axially limits the outer ring of the radial loading bearing (22); the upper part of the radial loading bearing seat (12) is also provided with a groove, and a cushion pad (24) is arranged in the groove.

4. The cylindrical roller bearing double-rotor testing machine shafting structure of claim 1, wherein: the auxiliary bearing (23) is a cylindrical roller bearing, the inner ring of the auxiliary bearing is axially limited by a shaft shoulder and a stepped sleeve, the outer ring of the auxiliary bearing is fixedly connected with an auxiliary bearing seat (18), an auxiliary bearing oil distribution disc (25) is further arranged on the side of the auxiliary bearing (23), the auxiliary bearing oil distribution disc (25) is fixedly connected with the auxiliary bearing seat (18) and is used for providing lubricating oil gas for the auxiliary bearing (23); and the two sides of the test bearing seat (18) are respectively provided with a pressure ring A (17) and a pressure ring B (19), and the pressure rings A (17) and the pressure rings B (19) are fixedly connected with the testing machine body and used for axially limiting the test bearing seat (18).

5. The cylindrical roller bearing double-rotor testing machine shafting structure of claim 1, wherein: the outer ring of the supporting bearing is fixedly connected with an angular contact bearing fixed pressure plate (7), and the outer ring of the axial loading bearing is fixedly connected with an angular contact bearing floating pressure plate (4); an oil-gas lubrication oil distribution disc (5) of the angular contact bearing is further arranged between the two angular contact bearings, the oil-gas lubrication oil distribution disc (5) of the angular contact bearing is fixed on a fixed pressure plate (7) of the angular contact bearing and is provided with a bidirectional nozzle, and the bidirectional nozzle faces the supporting bearing and the axial loading bearing respectively.

6. The cylindrical roller bearing double-rotor testing machine shafting structure of claim 5, wherein: one side of the angular contact bearing fixing pressure plate (7) close to the test bearing (21) is also fixedly connected with an angular contact bearing pressure ring (8), and the angular contact bearing pressure ring (8) is fixedly connected with the testing machine body and axially limits the angular contact bearing fixing pressure plate (7).

7. The cylindrical roller bearing dual-rotor testing machine shafting structure of claim 5, wherein: one side of the angular contact bearing floating pressure plate (4) back to the angular contact bearing fixed pressure plate (7) is embedded with a bearing ring (28) for bearing axial load, one side of the bearing ring (28) close to the test bearing (21) is also provided with a plurality of pressure sensors (29), a guide wire hole of each pressure sensor (29) is provided with a guide pin (9), and the guide pins (9) are arranged in the angular contact bearing floating pressure plate (4) and the angular contact bearing fixed pressure plate (7) in a penetrating manner.

8. The cylindrical roller bearing double-rotor testing machine shafting structure of claim 5, wherein: the angular contact bearing floating pressure plate (4) is also sleeved with a linear bearing (6) and a retainer.

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