CN117433786A - Bidirectional loading moment testing machine for bearing - Google Patents

Abstract

The invention relates to the technical field of bearing testing, in particular to a bidirectional loading moment testing machine for a bearing, which comprises a frame, wherein a test bearing rotating mechanism and a test bearing fixing structure are arranged on the frame, a loading bearing seat is connected to the test bearing rotating mechanism, an axial loading mechanism and a radial loading mechanism are also arranged on the frame, a load coupling structure is arranged between the axial loading mechanism and the radial loading mechanism, force application ends of the axial loading mechanism and the radial loading mechanism jointly act on the load coupling structure, an axial and radial adjustable force arm adjusting mechanism is arranged between the load coupling structure and the loading bearing seat, the load after coupling is transmitted to the force arm adjusting mechanism through the force application ends on the force arm adjusting mechanism and is applied to the loading bearing seat, so that the testing process is consistent with the testing process in practical application when different axial and radial moments are simultaneously applied in practical working conditions, and the authenticity of a testing result is ensured.

Description

Bidirectional loading moment testing machine for bearing

Technical Field

The invention relates to the technical field of bearing testing, in particular to a bidirectional loading moment testing machine for a bearing.

Background

The bearing is an important part in modern mechanical equipment, the main function of the bearing is to support a mechanical rotating body, reduce the friction coefficient in the motion process of the mechanical rotating body and ensure the rotation precision of the mechanical rotating body, but the friction resistance of the bearing can be increased when the bearing rotates under heavy load, so that the friction moment of the bearing under the load needs to be tested to meet the requirements of different equipment, and the friction performance of the bearing is one of important indexes of the running quality of the bearing.

The conventional special bearing friction torque testing machine in the bearing industry generally performs a starting friction torque test under light load, the conventional special bearing light load starting friction torque testing equipment has limited effect on the actual application of the bearing, and after the conventional test bench is refitted, a large load test under axial load or radial load condition is performed on the conical bearing independently to perform a friction torque test. In actual operation, the bearing bears axial and radial loads at the same time, and some patents disclosed in the prior art also provide that some bearing friction moment measurement testing machines can simulate the situation that friction force is generated inside the bearing under the working condition that the bearing bears axial load and radial load at the same time, the outer ring and the inner ring of the test bearing are respectively arranged on the test bearing fixing seat and the test bearing rotating seat, and the radial loading mechanism and the axial loading mechanism act on the loading bearing seat at the same time, so that the high-precision measurement of the whole friction torque of the test bearing is realized by loading the radial loading mechanism and the axial loading mechanism on the test bearing.

However, the axial load and the radial load can be simultaneously applied by the test machines, the magnitude of the load force can only be adjusted, in practical application, the conical bearing can be found to have inconsistent friction characteristics when lubricated identically and rotated identically and bear different axial and radial moments of the same equivalent load (other bearings have similar problems, the conical roller bearing is more prominent), so that the existing test machines cannot meet more and more bearing friction characteristic research requirements related to practical operation occasions, and cannot provide real running friction moment data of the rolling bearing under practical application conditions, and real bearing friction moment test can provide a solid practical basis for the environment-friendly design of equipment, the friction research of the bearing and the design of bearing products, so that the test of different axial and radial moments during the test of bearing axial and radial loads simultaneously needs to be simulated in real conditions.

Disclosure of Invention

The invention aims to provide a bidirectional loading moment testing machine for a bearing, which is used for solving the problems that the existing bearing friction moment measurement testing machine can only adjust the magnitude of loading force when applying axial load and radial load simultaneously, can not truly simulate the test of bearing different axial and radial moments in an axial and radial loading test at the same time in actual application, and leads to unreal and accurate test data.

The bidirectional loading moment testing machine for the bearing adopts the following technical scheme: the bidirectional loading moment testing machine for the bearing comprises a frame, wherein a test bearing rotating mechanism for driving the test bearing to rotate and a test bearing fixing structure for fixing the test bearing are arranged on the frame, mounting ends for correspondingly mounting an outer ring and an inner ring of the test bearing are respectively arranged on the test bearing fixing structure and the test bearing rotating mechanism, a loading bearing seat is connected onto the test bearing rotating mechanism, an axial loading mechanism and a radial loading mechanism are further arranged on the frame, a load coupling structure is arranged between the axial loading mechanism and the radial loading mechanism, force application ends of the axial loading mechanism and the radial loading mechanism act on the load coupling structure together, an axial and radial adjustable force arm adjusting mechanism is arranged between the load coupling structure and the loading bearing seat, and the load after coupling is transmitted to the force arm adjusting mechanism through a force bearing end on the force arm adjusting mechanism and applied to the loading bearing seat so as to simulate testing of different axial and radial moments when the axial load and the radial load are applied simultaneously in actual working conditions.

The bidirectional loading moment testing machine for the bearing improves the existing bearing friction moment measurement testing table, when the bidirectional loading moment testing machine for the bearing is used, the outer ring and the inner ring of the test bearing are assembled on a rack through the corresponding test bearing fixing structure and the mounting end of the test bearing rotating mechanism, the test bearing rotating mechanism is started to enable the test bearing to enter an operating state, the test bearing rotating mechanism is connected with a loading bearing seat, the axial loading mechanism and the radial loading mechanism realize summarized coupling of forces through a load coupling structure, the moment arm adjusting mechanism is adjusted according to requirements, so that moment arms of the test bearing in the axial direction and the radial direction are adjusted, finally, different axial and radial moment arms of coupling forces are transmitted to the loading bearing seat, and then the actual working conditions of different axial and radial moment when the test bearing simultaneously applies axial load and radial load are simulated, so that the existing bearing friction moment measuring testing machine can simultaneously apply the axial load and the radial load only to adjust the magnitude of the load force, and the test data are tested to realize that the test of different axial and radial moment when the test bearing simultaneously bears the actual conditions, and the test data is more realistic and meets the actual operation occasion.

Further, the axial loading mechanism and the radial loading mechanism are arranged on the frame in an adjustable mode in the axial direction and the radial direction. The axial loading mechanism and the radial loading mechanism are arranged in the machine frame in an adjustable mode in the axial direction and the radial direction, the corresponding force arm adjusting mechanism is used for adjusting the axial moment and the radial moment, the position of a test bearing is not required to be adjusted through adjusting other structures in the machine frame, the structure of the whole device is simplified through the adjustment of the axial loading mechanism and the radial loading mechanism, and the adjustment is convenient.

Further, the force arm adjusting mechanism comprises an axial adjusting frame and a radial adjusting frame which are arranged vertically to each other, the axial adjusting frame is arranged on the radial adjusting frame in an axial and radial adjustable mode, a force transmission arm is connected to the radial adjusting frame and connected to the loading bearing seat, and the axial adjusting frame is connected with the load coupling structure. The axial moment and the radial moment are adjusted on the radial adjusting frame through the axial adjusting frame, so that the axial moment adjusting device is convenient to adjust and simple in structure.

Further, the axial adjusting frame comprises an axial base frame and an axial screw nut mechanism arranged on the axial base frame, the radial adjusting frame comprises a radial base frame and a radial screw nut mechanism arranged on the radial base frame, the axial base frame is fixedly connected to a nut of the radial screw nut mechanism, and the nut of the axial screw nut mechanism and the radial base frame are relatively fixedly arranged. The screw nut mechanisms are arranged on the axial adjusting frame and the radial adjusting frame respectively to achieve adjustment, so that the device is simple to operate, accurate in adjustment and capable of guaranteeing accuracy of measurement results.

Further, the load coupling structure is a coupling force transmission piece which is in force transmission connection with the two force application ends of the axial loading mechanism and the radial loading mechanism and the force receiving end of the force arm adjusting mechanism. The coupling force is transmitted through the two force application ends of the axial loading mechanism and the radial loading mechanism to the coupling force transmission piece, and then the coupling force is transmitted through the coupling force transmission piece to the force receiving end of the force arm adjusting mechanism, so that the coupling is convenient, and the structure is simple.

Further, two of the force application end of the axial loading mechanism, the force application end of the radial loading mechanism and the force receiving end of the force arm adjusting mechanism are U-shaped force transmission sleeves, the other one of the force application ends is connected with the coupling force transmission piece, and the coupling force transmission piece is a coupling force transmission rod which passes through opposite sleeve walls of the two U-shaped force transmission sleeves at the same time. The coupling connecting rod is fixed on one of the U-shaped force transmission sleeves, and passes through two other U-shaped force transmission sleeves, so that force transmission connection is realized, the structure is stable, and the force transmission effect is good.

Further, the test bearing rotating mechanism and/or the test bearing fixing structure are/is arranged on the frame in a guiding sliding manner. The distance can be adjusted to different test bearings through the arrangement, and the test bearing is convenient to use, disassemble, assemble and replace.

Further, a movable supporting platform is arranged on the frame in a guiding sliding manner, the test bearing rotating mechanism is arranged on the movable supporting platform, the force transmission arm is fixedly connected to the radial base frame, the loading bearing seat is connected to the movable supporting platform in a floating manner, and the guiding sliding of the movable supporting platform is realized through the axial screw nut mechanism. Realize the direction slip of moving support platform through test bearing slewing mechanism and axial lead screw nut mechanism cooperation to make to the test bearing adjustment distance of difference, need not to additionally set up adjustable device, the current adjustable mechanism of rational utilization simplifies the structure, thereby because loading bearing frame can not fixed connection on moving support platform shifts coupling force, consequently can guarantee through loading bearing frame floating connection not interfered when the load is applied to on the test bearing on moving support platform, and thereby provide loading bearing frame pulling force when moving support platform removes and realize that loading bearing frame drives moving support platform and in the frame direction slip.

Further, a spring supporting structure is arranged between the loading bearing seat and the movable supporting platform, and floating connection is achieved through the spring supporting structure. The spring supporting structure realizes the floating connection structure simply, and structural strength is high, and the installation of being convenient for, and height-adjustable can also guarantee the axiality of whole shafting.

Drawings

FIG. 1 is a top view of a first embodiment of a bi-directional loading torque tester for bearings of the present invention;

FIG. 2 is a front view of a first embodiment of a bi-directional loading torque tester for bearings of the present invention;

FIG. 3 is a left side view of a first embodiment of a bi-directional loading torque tester for bearings of the present invention;

FIG. 4 is an isometric view of a first embodiment of a bi-directional loading torque tester for bearings of the present invention;

fig. 5 is an exploded view of the structure at the load coupling structure of the first embodiment of the bi-directional loading torque tester for bearings of the present invention.

In the figure: 1. driving a servo motor; 2. a universal joint; 3. loading a bearing seat; 4. testing a bearing; 5. a static pressure shaft; 6. a torque limiter; 7. a torque sensor; 8. a coupling; 9. a torque measurement base; 10. a spring support structure; 11. moving the support platform; 12. a linear guide rail; 13. a frame; 14. an axial servo cylinder; 15. an axial electric cylinder base; 16. an axial guide rail; 17. axial loading mechanism screw rod; 18. an axial loading mechanism base; 19. loading a cross arm axially; 20. an axial knuckle bearing; 21. an axial telescopic rod; 22. an axial force sensor; 23. a force transmission sleeve; 24. a radial servo cylinder; 25. radial loading of the cross arm; 26. a radial vertical arm; 27. radial output cross arms; 28. a radial transition sleeve; 29. a radial force sensor; 30. a radial dowel bar; 31. coupling a dowel bar; 32. an axial base frame; 33. a radial base frame; 34. a force transmission arm.

Detailed Description

The features and capabilities of the present invention are described in further detail below in connection with the examples.

First, the technical scheme of the bidirectional loading moment testing machine for bearings of the present invention is generally described:

the bidirectional loading moment testing machine for the bearing can simulate the real situation and simultaneously bear the tests of different axial and radial moments in the axial and radial loading tests. The bidirectional loading moment testing machine for the bearing comprises a frame, wherein a test bearing rotating mechanism and a test bearing fixing structure for driving the test bearing to rotate are arranged on the frame, a bearing ring mounting end is arranged at a rotating output end of the test bearing rotating mechanism, the test bearing fixing structure is also provided with a shaft sleeve mounting end and is used for being matched with the bearing ring mounting end on the test bearing rotating mechanism to fix an outer ring and an inner ring of the test bearing, one of the two mounting ends can be a mounting shaft sleeved on the inner ring of the bearing, the other mounting end can be a mounting sleeve for mounting the outer ring of the bearing, and other fixing modes can be adopted.

The test bearing rotating mechanism is connected with a loading bearing seat, load is transmitted to the test bearing through the loading bearing seat, and the machine frame is also provided with an axial loading mechanism and a radial loading mechanism so as to apply axial load and radial load to the test bearing.

The conventional testing machine can only adjust the load force when applying axial and radial loads to the test bearing, and the actual application shows that various test characteristics which are shown when different axial and radial moments of the axial and radial loads are applied to the test bearing are not consistent, so the key point of the invention is that: the load coupling structure is arranged between the axial loading mechanism and the radial loading mechanism, the force application ends of the axial loading mechanism and the radial loading mechanism act on the load coupling structure together to realize the coupling load of axial load and radial load, the force arm adjusting mechanism which is adjustable in the axial direction and the radial direction is arranged between the load coupling structure and the loading bearing seat so as to correspond to the adjustment of different force arms according to the requirements, the load coupling structure transmits the coupled load to the force arm adjusting mechanism through the force application ends on the force arm adjusting mechanism and applies the load to the loading bearing seat, and therefore the load is transmitted to the test bearing through the loading bearing seat so as to simulate the test of different axial and radial moments when the axial load and the radial load are applied simultaneously in the actual working condition.

During the use, the outer ring and the inner ring of the test bearing are respectively assembled on the frame corresponding to the test bearing fixing structure and the mounting end of the test bearing rotating mechanism, the test bearing rotating mechanism is started to enable the test bearing to enter an operating state, the axial loading mechanism and the radial loading mechanism apply axial and radial loads simultaneously, the axial and radial loads realize the summarized coupling of forces through the load coupling structure, the axial force arm and the radial force arm of the force arm adjusting mechanism are adjusted according to requirements, finally, different axial force arms and different radial force arms of the coupling force are transmitted on the loading bearing seat and then are applied to the test bearing, the actual working conditions of different axial force moment and different radial force moment when the axial load and the radial load are simultaneously applied to the test bearing can be simulated, and the problem that the test data is inconsistent with the data under the actual operating condition caused by the fact that the axial load and the radial load are simultaneously applied to the existing test machine can only be adjusted.

The specific embodiment of the bidirectional loading moment testing machine for the bearing is as follows:

in order to more clearly explain the structure and the use occasion of the bidirectional loading moment testing machine for the bearing, the bidirectional loading moment testing machine for the bearing and the situation when the testing bearing are matched for use are used for unfolding description in the embodiment.

The bidirectional loading moment tester for the bearing comprises a rack 13, wherein the rack 13 is a table-shaped frame, a rectangular working table surface is arranged on the rack 13, the embodiment performs test operation in a mode of rotating an inner ring of the test bearing and fixing an outer ring of the test bearing, a test bearing rotating mechanism and a test bearing fixing structure are arranged on the working table surface, the test bearing rotating mechanism is used for driving the inner ring of the test bearing to rotate, the test bearing fixing structure is used for fixing the outer ring of the test bearing, and in other embodiments, the bidirectional loading moment tester for the bearing can also be used for rotating the outer ring of the test bearing and fixing the inner ring of the test bearing. The test bearing fixing structure is provided with a fixed end for installing the test bearing outer ring, and the test bearing rotating mechanism is provided with a mounting end for installing the test bearing inner ring.

The test bearing rotating mechanism is connected with the loading bearing seat 3, the loading bearing seat 3 comprises a fixed outer bearing seat and a rotating inner bearing seat, the loading bearing seat 3 is used for transmitting loading load to the test spindle through the loading bearing so as to be applied to the test bearing 4, the bearing ring mounting end of the test bearing rotating mechanism is arranged at the end part of the rotating inner bearing seat, the loading load is indirectly transmitted to the tested bearing 4 through the loading bearing seat 3, the loading is applied more stably and uniformly, and the test effect is accurate. The machine frame 13 is also provided with an axial loading mechanism and a radial loading mechanism for applying axial load and radial load to the test bearing 4, the axial loading mechanism and the radial loading mechanism can both adopt loading oil cylinders or loading electric cylinders, the force application ends of the axial loading mechanism and the radial loading mechanism are in force transmission connection with a load coupling structure, an axial and radial adjustable force arm adjusting mechanism is arranged between the load coupling structure and the load bearing seat 3, the load coupling structure couples the axial load and the radial load, and the coupled load is transmitted to the force arm adjusting mechanism through a force bearing end on the force arm adjusting mechanism and is applied to the load bearing seat 3 so as to simulate the test of different axial and radial moments when the axial load and the radial load are simultaneously applied in actual working conditions.

The force arm of the axial load and the radial load is adjustable, the application points of the axial load and the radial load are required to be adjustable relative to the test bearing 4, in order to facilitate the simplified operation of the whole adjustment on the frame 13, preferably, the axial loading mechanism and the radial loading mechanism are arranged on the frame 13 in an adjustable manner in the axial direction and the radial direction (the axial direction and the radial direction are based on the axial direction and the radial direction of the tested bearing 4), so that the test bearing 4 relatively keeps a fixed position, the axial loading mechanism and the radial loading mechanism are arranged on the frame 13 in an adjustable manner in the axial direction and the radial direction corresponding to the force arm adjusting mechanism, thereby realizing the axial moment adjustment and the radial moment adjustment, and simplifying the structure of the whole device without adjusting other structures on the frame 13. Of course, in other embodiments, the worktable on the frame 13 can be arranged on the frame 13 in an adjustable manner in the axial direction and the radial direction, the axial loading mechanism and the radial loading mechanism are fixed differently relative to the frame 13, and the requirements of different axial and radial standing arms can be met through the movement of the worktable.

In order to facilitate the axial and radial adjustment of the force arm, the structure is simple, the adjustment is convenient, preferably, the force arm adjusting mechanism comprises an axial adjusting frame and a radial adjusting frame, the axial adjusting frame and the radial adjusting frame are mutually perpendicular, the axial adjusting frame is arranged on the radial adjusting frame in an axial and radial adjustable mode, when the axial adjusting frame is radially adjusted along the radial adjusting frame, the radial adjusting frame is axially adjusted along the radial adjusting frame, the axial force arm is adjusted, the radial adjusting frame is connected with a force transmission arm 34, one end of the force transmission arm 34 is connected with the radial adjusting frame, the other end of the force transmission arm is connected with a loading bearing seat 3, the load after the force arm is adjusted is transmitted to the loading bearing seat 3, the stress end of the force arm adjusting mechanism is arranged on the axial adjusting frame, and the axial adjusting frame is connected with the load coupling structure through the stress end of the force arm adjusting mechanism. The axial adjusting frame and the radial adjusting frame are vertical arm adjusting mechanisms capable of relatively moving to achieve vertical arm adjustment, and of course, in other embodiments, the axial adjusting frame and the radial adjusting frame can adopt telescopic frame bodies, for example, frame arms in the length direction of the frame bodies adopt a mode of threaded connection of double screws and middle screw sleeves, and the telescopic frame arms are achieved through adjusting the middle screw sleeves, so that length adjustment is achieved.

In order to realize accurate convenient arm of force regulation of axial alignment jig at radial alignment jig, this embodiment is preferably realized through screw nut mechanism drive, specifically, the axial alignment jig includes axial bed frame 32, install axial screw nut mechanism on the axial bed frame 32, axial bed frame 32 is provided with the hand wheel in the one end that keeps away from load coupling structure, radial alignment jig includes radial bed frame 33, install radial screw nut mechanism on the radial bed frame 33, axial bed frame 32 fixed connection is on the nut of radial screw nut mechanism, radial bed frame 33 is provided with the hand wheel in radial screw's top, the nut and the radial bed frame 33 relative fixed setting of axial screw nut mechanism realize adjusting through setting up screw nut mechanism on axial alignment jig and radial alignment jig respectively, guarantee measuring result's accuracy, convenient operation. Of course, in other embodiments, the axial base frame 32 and the radial base frame 33 are both provided with slide rails, the slide rails are provided with slide blocks guiding and sliding along the slide rails, the radial base frame 33 is fixedly connected to the slide blocks on the axial base frame 32, the slide blocks of the axial base frame 32 and the radial base frame 33 are relatively fixedly arranged, the slide blocks are provided with locking structures on the slide rails, and the slide blocks are manually driven to slide to the positions where test data are required according to requirements, so that axial and radial arm regulation is realized.

In this embodiment, the load coupling structure is preferably a coupling force transmission member in force transmission connection with two force application ends of the axial loading mechanism and the radial loading mechanism, and meanwhile, the coupling force transmission member is in force transmission connection with a force receiving end of the force arm adjusting mechanism, and the coupling force is transmitted through the same component of the coupling force transmission member, so that the load coupling structure is simple in structure and convenient to couple. In particular, in order to achieve a better force transmission if the coupling force transmission member is made to achieve with two force application ends and one force receiving end, and structural stability, it is preferable that two of the force application ends of the axial loading mechanism, the force application ends of the radial loading mechanism, and the force receiving ends of the arm adjusting mechanism are U-shaped force transmission sleeves 23, and the other coupling force transmission member is a coupling force transmission rod 31 that passes through the opposite sleeve walls of the two U-shaped force transmission sleeves 23 at the same time. In this embodiment, as shown in fig. 5, taking the force application end of the axial loading mechanism and the force receiving end of the force arm adjusting mechanism as a U-shaped force transmission sleeve 23 as an example, the sleeve openings of the two U-shaped force transmission sleeves 23 are oppositely arranged, through holes for the coupling force transmission rods 31 to pass through are formed in the two sleeve walls, and the coupling force transmission rods 31 are connected to the force application end of the radial loading mechanism. Or in other embodiments, the force application ends of the axial loading mechanism and the radial loading mechanism are U-shaped force transmission sleeves 23, and the force receiving end of the force arm adjusting mechanism is arranged to be coupled with the force transmission rod 31; and the coupling force transmission piece is a T-shaped piece, and three ends of the T-shaped piece are respectively connected with the force application end of the axial loading mechanism, the force application end of the radial loading mechanism and the force receiving end of the force arm adjusting mechanism.

Specifically, the loading output end of the axial loading mechanism is connected with an axial telescopic rod 21, the axial telescopic rod 21 realizes that the axial loading mechanism is arranged in an adjustable mode in the axial direction, a U-shaped force transmission sleeve 23 of the axial loading mechanism is connected to the axial telescopic rod 21, the loading output end of the radial loading mechanism is connected with a radial force transmission rod 30, a sleeve is connected to the radial force transmission rod 30, the sleeve is adjustable in position on the radial force transmission rod 30 and can be locked on the radial force transmission rod 30 through a locking structure, so that the radial loading mechanism is arranged in an adjustable mode in the radial direction, a coupling force transmission rod 31 is arranged at two ends of the sleeve in a mode of being perpendicular to the radial force transmission rod 30, and force transmission connection is realized by respectively penetrating through sleeve walls of the two U-shaped force transmission sleeves 23.

In order to facilitate the mounting of test bearings 4 of different sizes and to facilitate the adjustment and use without the need for disassembly of the mounting, the test bearing rotating mechanism and/or the test bearing fixing structure are preferably guided slidably arranged on the frame 13. In this embodiment, the bench surface of the frame 13 is provided with a movable supporting platform 11 in a guiding sliding manner, the movable supporting platform 11 is fixed on the frame 13 through a linear guide rail 12, free movement of the movable supporting platform 11 is achieved, a test bearing rotating mechanism is installed on the movable supporting platform 11, movement of the test bearing rotating mechanism is achieved through adjusting the movable supporting platform 11, and therefore the distance between the test bearing rotating mechanism and the test bearing fixing structure is adjusted, and the test bearing 4 is convenient to disassemble, assemble and replace.

Specifically, the force transmission arm 34 is fixedly connected to the radial base frame 33, the loading bearing seat 3 is in floating connection with the movable supporting platform 11, so that the guiding sliding of the movable supporting platform 11 can be realized through an axial lead screw nut mechanism, an adjusting device of the movable supporting platform 11 is not required to be additionally arranged, the existing adjusting mechanism is reasonably utilized, the whole test machine structure is simplified, and the loading bearing seat 3 cannot be fixedly connected to the movable supporting platform 11 so as to transfer coupling force to the movable supporting platform 11, so that the loading bearing seat 3 is in floating connection with the movable supporting platform 11, the load can be ensured not to be interfered when the load is applied to the test bearing 4, and the tension force provided to the loading bearing seat 3 when the movable supporting platform 11 moves is provided for realizing that the loading bearing seat 3 drives the movable supporting platform 11 to guide sliding on the frame 13. Of course, in other embodiments, the test bearing rotating mechanism is fixedly arranged on the frame 13, the test bearing 4 fixing structure is movably arranged on the frame 13, and the test bearings 4 with different sizes are installed by adjusting the test bearing 4 fixing structure.

Specifically, in order to achieve the strength of the floating connection structure between the loading bearing housing 3 and the movable supporting platform 11, the reliability of the pulling process is ensured, preferably, the loading bearing housing 3 and the movable supporting platform 11 are in floating connection by being provided with a spring supporting structure 10, and the spring supporting structure 10 is simple to achieve, convenient to install, and high in structural strength. In this embodiment, loading bearing frame 3 below is provided with the mounting panel, and the mounting panel lower part is provided with the clamp plate, and the clamp plate presses on spring supporting structure 10, and spring supporting structure 10 keeps the spring to stably install on moving supporting platform 11 through the spring positioning seat, is provided with the screw hole on the mounting panel, and mounting panel and clamp plate pass through the double-screw bolt and make loading bearing frame 3 height-adjustable, guarantee the axiality of whole shafting. Of course, it is also feasible to use an elastic cushion layer on the movable supporting platform 11 to realize elastic floating support on the loading bearing seat 3, and at this time, a stop structure in two axial directions needs to be set on two sides of the force transmission arm 34 connected to the loading bearing seat 3 and located on the movable platform, so as to drive the bearing loading seat to move when the radial base frame 33 drives the force transmission arm 34 to move, and after the bearing loading seat contacts with the stop structure, the whole movable supporting platform 11 is driven to move.

Specifically, in this embodiment, the test bearing driving mechanism includes a driving servo motor 1 and a test spindle, and the direction shown in fig. 1 is used as reference, the driving servo motor 1 is located at the leftmost end of the working table, the driving servo motor 1 is connected with the test spindle through a universal joint 2, a loading bearing seat 3 is mounted on the test spindle, and the inner ring of the test bearing is detachably and fixedly connected with the test body. The test bearing fixing structure comprises a static pressure shaft 5, the static pressure shaft 5 is fixedly arranged on a workbench surface, an outer ring of the test bearing is fixed on the left side surface of the static pressure shaft 5 through a flange, the right side surface of the static pressure shaft 5 is a load output end, a torque limiter 6, a torque sensor 7, a coupler 8 and a torque measuring base 9 are respectively connected in series, the outer ring of the test bearing transmits loading torque to the torque sensor 7 through the static pressure shaft 5, so that bearing friction torque is measured through the torque sensor 7, the torque measuring base 9 is fixedly arranged on the workbench surface, and the test bearing fixing structure can be applied to simulation test requirements of other working conditions, and is not limited to friction torque.

The bearing near one end of the test bearing 4 on the loading bearing seat 3 adopts two cylindrical roller bearings so as to better bear the radial force, and the bearing at the other end adopts an angular contact ball bearing so as to bear the axial and radial loads at the same time, thereby completely meeting the technical requirements of the test machine.

The axial loading mechanism comprises an axial servo cylinder 14, the axial servo cylinder 14 is used for loading, the axial servo cylinder 14 is fixed through an axial cylinder base 15, the axial loading mechanism further comprises an axial loading mechanism base 18, the axial loading mechanism base 18 is radially provided with an axial guide rail 16, the axial loading mechanism is enabled to be adjustable along the radial direction, an axial loading mechanism lead screw 17 is fixed on the axial loading mechanism base 18, the axial loading mechanism base 18 is provided with a hand wheel for driving the axial loading mechanism lead screw 17 to rotate, the output end of the axial servo cylinder 14 is connected with an axial loading cross arm 19, two ends of the axial loading cross arm 19 are connected with an axial telescopic rod 21 through an axial joint bearing 20, loading forces are transmitted through the joint bearing at two ends of the loading arm, the fact that the loading force is generated by the stress deformation of the loading arm to further influence loading precision is avoided, the axial telescopic rod 21 is connected with an axial force sensor 22 for measuring the axial load, and the axial force sensor 22 is connected with a U-shaped force transmission sleeve 23 of the axial loading mechanism.

The radial loading mechanism comprises a radial servo electric cylinder 24, the radial servo electric cylinder 24 is arranged at the bottom of the frame 13, the radial servo electric cylinder 24 is used for loading, the radial loading mechanism is fixed through a radial electric cylinder base, the radial loading mechanism further comprises a radial loading mechanism base, a radial guide rail which is axially arranged is arranged on the radial loading mechanism base, the radial loading mechanism is axially adjustable, an axial loading mechanism screw 17 is fixed on the radial loading mechanism base, a hand wheel which drives the radial loading mechanism screw to rotate is arranged on the radial loading mechanism base, the output end of the radial servo electric cylinder 24 is connected with a radial loading cross arm 25, the two ends of the radial loading cross arm 25 are sequentially connected with radial vertical arms 26 to realize the radial force distribution on the two sides of the lower end of the frame 13, the radial force is commutated to the two sides of the length direction of the frame 13 from the lower end of the frame 13 through a radial output cross arm 27 and a radial joint bearing, and finally the radial force sensor 29 is connected to a radial force transmission rod 30 through a radial transition sleeve 28 and a radial force sensor 29, and the radial force transmission rod 30 is connected with a coupling force transmission rod 31 through a sleeve.

When the bidirectional loading moment testing machine for the bearing is used, the inner ring of the test bearing 4 is fixedly connected to the main shaft mounting end of the rotating mechanism of the test bearing 4, the hand wheel on the axial base frame 32 drives the movable supporting platform 11 to move towards the fixed seat of the test bearing 4, the outer ring of the test bearing 4 is fixedly connected with the flange mounting end on the fixed seat of the test bearing 4, and then the movable supporting platform 11 is locked on the frame 13, so that the test bearing 4 is mounted. According to the axial and radial moment demands, firstly, the radial moment arm is adjusted through the simultaneous operation of a hand wheel on the radial base frame 33, a hand wheel of the axial loading mechanism and a unscrewing sleeve, secondly, the axial moment arm is adjusted through the simultaneous operation of the hand wheel of the axial base frame 32, the hand wheel of the axial telescopic rod 21 and the hand wheel of the radial loading mechanism, finally, the axial loading mechanism and the radial loading mechanism are started to apply the required load, the axial load is transmitted to the coupling dowel bar 31 through the U-shaped force transmission sleeve 23 of the axial loading mechanism, the radial load is transmitted to the coupling dowel bar 31 through the sleeve, the coupling dowel bar 31 is transmitted to the axial base frame 32 through the U-shaped force transmission sleeve 23 of the moment arm adjustable mechanism, the force transmission arm 34 is transmitted to the force transmission arm 34, and then the force transmission arm 34 is applied to the loading bearing seat 3, so that the friction moment is transmitted to the test bearing 4, and finally, the friction moment test of different axial and radial moment when the axial load and the radial load are simultaneously applied in the simulated actual working conditions is realized through the friction moment sensor.

Through the description of the specific embodiment of the bidirectional loading moment testing machine for the bearing, the bidirectional loading moment testing machine for the bearing can be seen, the summarized coupling of forces is realized through the load coupling structure, the axial and radial moment arms are adjusted according to requirements by adjusting the axial loading mechanism, the radial loading mechanism and the moment arm adjusting mechanism, different axial and radial moment arms of coupling force are finally transmitted to the loading bearing seat and then are applied to the test bearing, the actual working conditions of different axial and radial moment when the axial load and the radial load are simultaneously applied to the test bearing can be simulated, and the scene performance consistent with the actual running application is ensured.

The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The bidirectional loading moment testing machine for the bearings comprises a frame (13), wherein a test bearing rotating mechanism for driving the test bearings to rotate and a test bearing fixing structure for fixing the test bearings are arranged on the frame (13), mounting ends for correspondingly mounting outer rings and inner rings of the test bearings are respectively arranged on the test bearing fixing structure and the test bearing rotating mechanism, a loading bearing seat (3) is connected to the test bearing rotating mechanism, and an axial loading mechanism and a radial loading mechanism are further arranged on the frame (13).

2. The machine according to claim 1, characterized in that the axial loading mechanism and the radial loading mechanism are both axially and radially adjustable on the frame (13).

3. The bidirectional loading moment testing machine for the bearing according to claim 2, wherein the moment arm adjusting mechanism comprises an axial adjusting frame and a radial adjusting frame which are arranged vertically to each other, the axial adjusting frame is arranged on the radial adjusting frame in an axial and radial adjustable manner, a force transmission arm (34) is connected to the radial adjusting frame, the force transmission arm (34) is connected to the loading bearing seat (3), and the axial adjusting frame is connected with the load coupling structure.

4. A bi-directional loading torque tester for bearings according to claim 3, wherein the axial adjusting frame comprises an axial base frame (32) and an axial screw nut mechanism mounted on the axial base frame (32), the radial adjusting frame comprises a radial base frame (33) and a radial screw nut mechanism mounted on the radial base frame (33), the axial base frame (32) is fixedly connected to a nut of the radial screw nut mechanism, and the nut of the axial screw nut mechanism and the radial base frame (33) are fixedly arranged relatively.

5. The bi-directional loading torque tester for bearings according to claim 1, wherein the load coupling structure is a coupling force transmitting member in force transmitting connection with both the force applying ends of the axial loading mechanism and the radial loading mechanism and the force receiving end of the arm adjusting mechanism.

6. The bidirectional loading moment tester for bearings according to claim 5, wherein two of the force application ends of the axial loading mechanism, the radial loading mechanism and the force application ends of the arm adjusting mechanism are U-shaped force transmission sleeves (23), and the other is connected with the coupling force transmission member, and the coupling force transmission member is a coupling force transmission rod (31) passing through opposite sleeve walls of the two U-shaped force transmission sleeves (23) at the same time.

7. The bi-directional loading torque tester for bearings according to claim 4, wherein the test bearing rotating mechanism and/or the test bearing fixing structure are/is slidably provided on a frame (13).

8. The bidirectional loading moment testing machine for bearings according to claim 7, wherein a movable supporting platform (11) is arranged on the frame (13) in a guiding sliding manner, the test bearing rotating mechanism is arranged on the movable supporting platform (11), the force transmission arm (34) is fixedly connected to the radial base frame (33), the loading bearing seat (3) is in floating connection to the movable supporting platform (11), and the guiding sliding of the movable supporting platform (11) is realized through an axial lead screw nut mechanism.

9. The bidirectional loading moment testing machine for bearings according to claim 8, characterized in that a spring support structure (10) is arranged between the loading bearing seat (3) and the movable support platform (11), and floating connection is realized through the spring support structure (10).