CN-121994485-A - Axial stress calibration device and method for three-point contact ball bearing

CN121994485ACN 121994485 ACN121994485 ACN 121994485ACN-121994485-A

Abstract

The application relates to an axial stress calibration device and a calibration method for a three-point contact ball bearing, which belong to the technical field of bearing tests and comprise a control unit, a shell and a main shaft arranged in the shell, wherein a first three-point contact ball bearing and a second three-point contact ball bearing are sleeved on the main shaft, an intermediate bearing assembly is sleeved outside the main shaft, a radial loading device is also arranged in the shell, a thrust sleeve in sliding fit with the shell is arranged outside the first three-point contact ball bearing, the second three-point contact ball bearing is in sliding fit with the shell, a transition sleeve propping against the second three-point contact ball bearing is arranged in sliding fit with the shell, an axial loading device is arranged outside the shell, a first pressure sensor is arranged between the axial loading device and the thrust sleeve, a limiting piece is arranged outside the shell, and a second pressure sensor is arranged between the transition sleeve and the limiting piece. The application can realize the direct measurement and calibration of the axial force transmitted to the far-end three-point contact ball bearing in the multi-bearing serial structure.

Inventors

YU HAIBO
Hao Bangguo
FU LIYANG
LIU JING
LIU MINGHUI
LIU DANDAN
LI YUCHUAN
GENG TAO
HE LIN
GAO JIAQI
YANG XIJUN

Assignees

洛阳轴承集团股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1. The axial stress calibration device for the three-point contact ball bearing is characterized by comprising a control unit, a shell (7) and a main shaft (12) arranged in the shell (7), wherein a first three-point contact ball bearing (11) and a second three-point contact ball bearing (19) are sleeved on the main shaft (12) close to two ends of the main shaft respectively, an intermediate bearing assembly (28) is sleeved on the outer side of the main shaft (12), the intermediate bearing assembly (28) is positioned between the first three-point contact ball bearing (11) and the second three-point contact ball bearing (19), and a radial loading device for applying radial load to the intermediate bearing assembly (28) is further arranged in the shell (7); The outer side of the first three-point contact ball bearing (11) is provided with a thrust sleeve (9) which is in sliding fit with the shell (7), the second three-point contact ball bearing (19) is in sliding fit with the shell (7), a transition sleeve (26) which is propped against the second three-point contact ball bearing (19) is arranged in the sliding mode in the shell (7), the outer side of the shell (7) is also provided with an axial loading device (27) which is used for applying axial force to the thrust sleeve (9), a first pressure sensor (4) is arranged between the axial loading device (27) and the thrust sleeve (9), the outer side of the shell (7) is also provided with a limiting piece, and a second pressure sensor (25) is arranged between the transition sleeve (26) and the limiting piece; The control unit is respectively connected with the axial loading device (27), the radial loading device, the first pressure sensor (4) and the second pressure sensor (25).
2. The three-point contact ball bearing axial stress calibration device according to claim 1, wherein the axial loading device (27) comprises an axial supporting seat (2) connected with the shell (7), an axial loading oil cylinder (1) arranged on the axial supporting seat (2) and an oil cylinder transition sleeve (3) arranged at the end part of a piston rod of the axial loading oil cylinder (1), the first pressure sensor (4) is arranged at the end part of the oil cylinder transition sleeve (3), and an axial loading rod (5) which is in interference with the thrust sleeve (9) is arranged at the end part of the first pressure sensor (4).
3. The axial stress calibration device of the three-point contact ball bearing according to claim 2, wherein one end of the main shaft (12) is provided with a first thread section, a first locking nut (10) which is abutted against the inner ring of the first three-point contact ball bearing (11) is connected to the first thread section in a threaded manner, and a flange of the outer ring of the first three-point contact ball bearing (11) is connected with the thrust sleeve (9) through a screw.
4. The three-point contact ball bearing axial stress calibration device according to claim 3, wherein the shell (7) is provided with a first supporting seat (8), and the first supporting seat (8) is provided with a first guide channel which is in sliding fit with the thrust sleeve (9).
5. The three-point contact ball bearing axial stress calibration device according to claim 4, wherein the radial loading device comprises a radial supporting seat, a radial loading oil cylinder arranged on the radial supporting seat and a radial loading rod (6) arranged at the end part of a piston rod of the radial loading oil cylinder.
6. The axial stress calibration device for the three-point contact ball bearing according to claim 5, wherein the middle bearing assembly (28) comprises two cylindrical roller bearings (14) sleeved on the main shaft (12), a loading sleeve (15) is arranged on the outer sides of the two cylindrical roller bearings (14), a limiting sinking groove matched with the radial loading rod (6) is arranged on the outer sides of the loading sleeve (15), an outer spacer (16) is arranged between the outer rings of the two cylindrical roller bearings (14), an inner spacer (17) is arranged between the inner rings of the two cylindrical roller bearings (14), middle end covers (13) are respectively arranged on two sides of the loading sleeve (15), the middle end covers (13) are abutted against the outer rings of the cylindrical roller bearings (14) on the same sides of the middle end covers, middle spacers (18) are sleeved on the main shaft (12), and the middle spacers (18) are abutted against the inner rings of the opposite cylindrical roller bearings (14).
7. The axial stress calibration device for the three-point contact ball bearing according to claim 6, wherein an inner bushing (20) is arranged on the outer side of the main shaft (12), a second three-point contact ball bearing (19) is sleeved on the outer side of the inner bushing (20) and the inner ring of the second three-point contact ball bearing abuts against the middle spacer (18), a second threaded section is arranged on the other end of the main shaft (12), a second locking nut (21) abutting against the inner bushing (20) is connected to the second threaded section in a threaded manner, a second supporting seat (22) is arranged on the shell (7), a second guide channel which is in sliding fit with the second three-point contact ball bearing (19) and the transition sleeve (26) is arranged on the second supporting seat (22), a yielding groove which is communicated with the second guide channel is further arranged on the second supporting seat (22), and a moving distance is reserved between a retaining edge of the outer ring of the second three-point contact ball bearing (19) and the yielding groove.
8. The axial stress calibration device for the three-point contact ball bearing according to claim 1, wherein the second pressure sensor (25) is arranged on the transition sleeve (26), the limiting piece comprises a limiting disc (24) propped against the second pressure sensor (25), a plurality of adjusting screws (23) penetrating through the limiting disc (24) in a sliding mode are arranged on the second supporting seat (22), and limiting nuts propped against the outer sides of the limiting disc (24) are connected to the adjusting screws (23) in a threaded mode.
9. A three-point contact ball bearing axial stress calibration method, which adopts the three-point contact ball bearing axial stress calibration device as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps: s1, a control unit controls a radial loading device to apply radial load to an intermediate bearing assembly (28), and values of a first pressure sensor (4) and a second pressure sensor (25) are zeroed; S2, the control unit controls the axial loading device (27) to apply different axial loads to the thrust sleeve (9), a plurality of initial loads F1 under different axial loads are obtained through the first pressure sensor (4), and a plurality of final loads F2 under different axial loads are obtained through the second pressure sensor (25); and S3, according to the initial loads F1 and the final loads F2, establishing a corresponding relation model of the initial loads F1 and the final loads F2, and completing the calibration of the axial stress of the three-point contact ball bearing.
10. The method for calibrating axial stress of a three-point contact ball bearing according to claim 9, wherein the correspondence model is a linear regression model, f2=k·f1+b, where k is a slope and b is an intercept.

Description

Axial stress calibration device and method for three-point contact ball bearing Technical Field The invention relates to the technical field of bearing testing, in particular to a device and a method for calibrating axial stress of a three-point contact ball bearing. Background The three-point contact ball bearing is a rolling bearing capable of bearing radial load and bidirectional axial load at the same time, and is widely applied to mechanical equipment which needs high-precision rotary support. In critical equipment such as aeroengines, high speed machine spindles, etc., three-point contact ball bearings are often used in combination with other types of bearings to form a simply supported beam or other support structure. In practical engineering application, the axial stress state of the three-point contact ball bearing directly influences the service life of the bearing and the operation reliability of equipment. However, in the simple beam structure in which multiple bearings are connected in series, when an axial load is applied to one end bearing, the load is transmitted to the other end bearing through the shafting, but the axial force transmitted to the distal end bearing is difficult to directly determine due to the supporting effect of the intermediate bearing and friction between the components. In the prior art, finite element simulation calculation or an indirect calculation method based on deformation coordination is generally adopted to estimate the stress of the far-end bearing, but the problems of large calculation error, incapability of real-time monitoring and the like exist in the methods. Part of the technical proposal indirectly measures the stress by sticking a strain gauge on a bearing seat or a shaft, but the calibration process is complex, and the measurement accuracy is greatly influenced by the installation position. Therefore, there is a need for a calibration device and method that can directly measure the axial force of a three-point contact ball bearing in a multi-bearing tandem structure. Disclosure of Invention In view of the above, the invention aims to provide a device and a method for calibrating axial stress of a three-point contact ball bearing, which are used for solving the technical problem that the axial stress of a far-end three-point contact ball bearing is difficult to directly measure and calibrate under a multi-bearing serial simply supported beam structure in the prior art. The technical scheme includes that the three-point contact ball bearing axial stress calibrating device comprises a control unit, a shell and a main shaft arranged in the shell, wherein a first three-point contact ball bearing and a second three-point contact ball bearing are sleeved on the main shaft near two ends of the main shaft respectively, an intermediate bearing assembly is sleeved outside the main shaft, the intermediate bearing assembly is positioned between the first three-point contact ball bearing and the second three-point contact ball bearing, a radial loading device for applying radial load to the intermediate bearing assembly is further arranged in the shell, a thrust sleeve in sliding fit with the shell is arranged outside the first three-point contact ball bearing, the second three-point contact ball bearing is in sliding fit with the shell, a transition sleeve propping against the second three-point contact ball bearing is arranged in the shell in a sliding manner, an axial loading device for applying axial force to the thrust sleeve is arranged outside the shell, a first pressure sensor is arranged between the axial loading device and the thrust sleeve, a limiting piece is arranged outside the shell, a second pressure sensor is arranged between the transition sleeve and the limiting piece, and the control unit is connected with the axial loading device, the radial loading device, the first pressure sensor and the second pressure sensor respectively. As the preferable scheme, the axial loading device comprises an axial supporting seat connected with the shell, an axial loading oil cylinder arranged on the axial supporting seat and an oil cylinder transition sleeve arranged at the end part of a piston rod of the axial loading oil cylinder, wherein a first pressure sensor is arranged at the end part of the oil cylinder transition sleeve, and an axial loading rod which is in contact with the thrust sleeve is arranged at the end part of the first pressure sensor. As the preferable scheme, one end of the main shaft is provided with a first thread section, a first lock nut propped against the inner ring of the first three-point contact ball bearing is connected to the first thread section in a threaded manner, and the flange of the outer ring of the first three-point contact ball bearing is connected with the thrust sleeve through a screw. As a preferable scheme, a first supporting seat is arranged on the shell, and a first guide channel which is in sliding fit with the thr