Automobile wheel hub bearing load friction torque testing machine and testing method thereof

Abstract

The invention discloses an automobile wheel hub bearing load friction torque testing machine and a testing method thereof, which relate to the technical field of bearing testing, and comprise a driving assembly, a mechanical shaft suspension assembly, a test bearing fixture assembly, a friction torque measuring assembly and an axial loading assembly which are sequentially connected to the upper part of a testing machine bed; a loading connector assembly is arranged outside the mechanical shaft suspension assembly, and the axial loading assembly and a radial loading assembly arranged at the lower part of the testing machine bed are both connected to the loading connector assembly; a hydraulic bearing suspension system and a clutch mounting seat are fixed at intervals on a mounting base plate B of the friction torque measuring assembly, a dynamic torque sensor is fixed on a left panel of the clutch mounting seat, the hydraulic bearing suspension system and the dynamic torque sensor are sequentially fixedly connected via a torque limiter and a coupling, and an electromagnetic clutch is connected to the right side of the dynamic torque sensor; the invention overcomes the disadvantage in the prior art that the additional torque of the hydraulic / pneumatic bearing cannot be eliminated, and makes the torque measurement more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of bearing testing, and in particular to an automobile wheel hub bearing load friction torque testing machine and a testing method thereof. Background Art

[0002] At present, the influence of the friction torque of automobile hub bearings on the energy-saving performance of the whole vehicle has always been of great concern to practitioners in the bearing industry. Especially with the vigorous development of new energy electric vehicles, the friction torque of automobile hub bearings has a great influence on the vehicle's cruising range.

[0003] The existing wheel hub bearing friction torque test technology is as follows: the driving motor drives the inner ring of the test bearing to rotate together through the coupling, the torque sensor, and the hydraulic / pneumatic bearing suspension system in sequence, and applies axial load and radial load to the outer ring of the test bearing at the same time; under the above test configuration, since the core shaft of the hydraulic / pneumatic bearing suspension system and the bearing to be tested rotate together, the measured friction torque is the sum of the friction torque of the bearing to be tested and the friction torque of the hydraulic / pneumatic bearing suspension system. At present, it is generally believed that the friction torque of the hydraulic / pneumatic bearing suspension system is very small, and the additional torque generated is directly ignored. The friction torque measured by the torque sensor is considered to be the friction torque of the bearing to be tested;

[0004] However, the above prior art has the following unavoidable shortcomings:

[0005] 1. When the hydraulic bearing suspension system is used to transmit the speed and load, although the friction coefficient of the liquid floating bearing is very small, it does exist and presents nonlinear numerical changes with the changes of speed, load, oil temperature and other conditions. In addition, the friction torque of the hydraulic bearing suspension system cannot be measured alone when it is rotating and loaded. Therefore, the main reason for the inaccurate value of the hub bearing friction torque measured by the existing technology is that it is impossible to eliminate the non-constant additional torque of the hydraulic bearing suspension system itself;

[0006] 2. When using a pneumatic bearing suspension system to transmit speed and load, the friction coefficient of the air bearing will be much smaller than that of the liquid bearing, and the value will be relatively accurate in theory. However, due to the relatively weak bearing capacity of air pressure, the air bearing will be stuck when performing a large load test, and it is not completely suitable for most hub bearing friction torque tests.

[0007] Therefore, it becomes a basic demand of those skilled in the art to propose a more accurate testing machine and a testing method thereof that can truly measure the friction torque value of the hub bearing. Summary of the invention

[0008] In order to overcome the deficiencies in the background technology, the present invention discloses an automobile wheel hub bearing load friction torque testing machine and a testing method thereof.

[0009] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme:

[0010] An automobile wheel hub bearing load friction torque tester comprises a test machine bed and a drive assembly, a mechanical shaft suspension assembly, a test bearing fixture assembly, a friction torque measurement assembly and an axial loading assembly which are sequentially connected to the upper part of the test machine bed from left to right; a loading connector assembly is arranged outside the mechanical shaft suspension assembly, and the axial loading assembly and a radial loading assembly arranged at the lower part of the test machine bed are both connected to the loading connector assembly;

[0011] The friction torque measurement assembly includes a mounting base plate B, a hydraulic bearing suspension system, a dynamic torque sensor, and an electromagnetic clutch. The hydraulic bearing suspension system and a clutch mounting seat are fixed on the mounting base plate B at intervals on the left and right sides. The dynamic torque sensor is fixed to the left panel of the clutch mounting seat through the sensor mounting seat. The hydraulic bearing suspension system and the dynamic torque sensor are fixedly connected through a torque limiter and a coupling in turn. An electromagnetic clutch fixedly connected through a coupling is provided on the right side of the dynamic torque sensor, and the electromagnetic clutch is fixed to the vertical plate of the clutch mounting seat.

[0012] The right end of the core shaft of the mechanical shaft suspension assembly drives the inner ring of the test hub bearing to rotate through the bearing inner ring connecting fixture of the test bearing fixture assembly, and the outer ring of the test hub bearing is fixedly connected to the hydraulic bearing suspension system through the bearing outer ring connecting fixture.

[0013] The automobile wheel hub bearing load friction torque testing machine is provided with a high and low temperature environment testing chamber outside the test wheel hub bearing.

[0014] The automobile wheel hub bearing load friction torque testing machine, the driving assembly includes a driving motor and a mounting base plate A, two parallel guide strips are fixed at intervals on the mounting base plate A, a motor mounting seat is slidably connected to the guide strips, the driving motor is fixed on the motor mounting seat, and a cross universal joint telescopic coupling hinged to the left end of the core shaft of the mechanical shaft suspension assembly is provided on the output shaft of the driving motor.

[0015] The automobile hub bearing load friction torque tester, the loading connector assembly includes a lifting arm, a fixing block, an axial loading radius adjustment arm and a mounting block A, lifting block assemblies are fixed on both sides of the upper side of the lifting arm, the lifting arm is connected to the outside of the mechanical shaft suspension assembly through a central circular hole, "L"-shaped axial loading radius adjustment arms are symmetrically installed at both ends of the lifting arm, a cross-shaped radial loading offset distance adjustment arm is arranged on the outside of any axial loading radius adjustment arm, an axial connector hingedly connected through a radial connector is arranged on the right side of the radial loading offset distance adjustment arm, a tightening sleeve B fixed to the axial loading assembly is arranged at the end of the axial connector, and a radial loading assembly is connected to the radial connector;

[0016] A mounting block A is provided on the outer surface of the radial loading offset distance adjusting arm, and a protrusion extending from the inner surface of the mounting block A passes through the transverse guide groove of the radial loading offset distance adjusting arm and is fixedly connected with a fixing block provided on the vertical guide groove of the axial loading radius adjusting arm;

[0017] A ball screw A is vertically passed through the mounting block A. An adjusting hand wheel A at the upper end of the ball screw A is fixed to a fixing plate on the upper end surface of the axial loading radius adjusting arm. A base at the lower end of the ball screw A is fixed to the bottom plate of the axial loading radius adjusting arm. The ball screw A drives the radial loading offset distance adjusting arm to be adjusted up and down along the guide groove on the axial loading radius adjusting arm through the adjusting hand wheel A.

[0018] A mounting block B is fixed on the outside of the mounting block A. The transverse ball screw B fixed on the radial load offset distance adjustment arm cooperates with the ball nut fixed in the inner hole of the mounting block B. The adjustment handwheel B at the end of the ball screw B drives the radial load offset distance adjustment arm to adjust its position in the horizontal direction.

[0019] The automobile hub bearing load friction torque tester, the radial loading assembly includes a mounting base plate D, a moving seat, a loading arm A and a mounting seat B, the mounting base plate D and the mounting seat B are respectively fixed on the lower base plate of the test machine bed by bolts in parallel and at intervals, the moving seat is slidably arranged in the guide groove on the mounting base plate D, a loading seat hingedly connected by a hinge seat A is arranged on the upper part of the moving seat, the loading arm A is located on the step surface on one side of the upper side of the moving seat, and is fixed to the lower side of the loading seat by bolts, both ends of the loading arm A are provided with a connecting seat A, a spoke type weighing sensor A and a loading column A connected in sequence by a joint bearing A, the loading column A is penetrated in the inner hole of the radial connecting piece, and a tightening sleeve A is arranged between the inner hole of the radial connecting piece and the loading column A; the left side plate of the loading seat is connected to the cylinder body of the radial loading electric cylinder by the hinge seat B, and the output end in the radial loading electric cylinder is connected to the left side surface of the moving seat by the joint bearing C; a worm gear reducer C is fixed on the mounting seat B, and the screw end of the worm gear reducer C is fixedly connected to the right side surface of the moving seat.

[0020] The automobile hub bearing load friction torque tester, the axial loading assembly includes a mounting base plate E and a loading arm B, the mounting base plate E is vertically mounted on the right end surface of the test bed, a movable base plate and an electric cylinder fixed plate are arranged parallel and spaced outside the mounting base plate E, the convex block on the inner surface of the movable base plate is slidably arranged in the vertical guide groove on the mounting base plate E, four guide shafts B arranged in a square are arranged between the movable base plate and the electric cylinder fixed plate, linear bearings B are arranged on the guide shafts B, the loading arm B is fixed between the four linear bearings B, an axial loading servo electric cylinder is arranged on the outer end surface of the electric cylinder fixed plate, the output end of the axial loading servo electric cylinder is connected to the loading arm B through a joint bearing D, and a connecting seat B connected through the joint bearing B is arranged at both ends of the loading arm B, a spoke type weighing sensor B and a loading column B are connected to the connecting seat B in sequence, and the loading column B is fixedly connected to the axial connecting piece through a tightening sleeve B respectively; a mounting plate A is fixed on the upper surface between the movable base plate and the electric cylinder fixed plate, and a lifting assembly for driving the movable base plate to move up and down is arranged on the upper surface of the mounting plate A.

[0021] The automobile wheel hub bearing load friction torque testing machine, the lifting assembly includes a connecting seat C, a worm gear reducer D and an adjusting hand wheel D, the screw of the worm gear reducer D is fixed in the "U"-shaped groove of the connecting seat C by a pin, the base of the worm gear reducer D is fixed on the upper part of the mounting base E, the hand crank end of the adjusting hand wheel D is connected to the mounting plate B on one end surface of the mounting base E, and the rod end of the adjusting hand wheel D is connected to the worm gear reducer D to form a linkage structure.

[0022] The automobile wheel hub bearing load friction torque tester also includes a hoisting weighing assembly arranged on the test bed, the hoisting weighing assembly includes a mounting base plate C, a machine base, a loading arm C and a pneumatic caliper, the mounting base plate C is fixed to the upper part of the test bed, the machine base is slidably arranged on the slide groove above the mounting base plate C through the lower slide bar, a worm gear reducer B for adjusting the sliding of the machine base is arranged on the left side of the machine base, the mechanical shaft suspension assembly is located in the inner cavity of the machine base, a mounting seat A is slidably arranged on the upper top plate of the machine base, and the mounting seat A is slidably arranged on the side of the machine base The worm gear reducer A fixed on the upper part is adjusted in position, a vertical plate is fixed on the left side of the top plate on the machine base, a weighing servo electric cylinder is fixed on the middle part of the upper part of the mounting seat A, and the output end of the weighing servo electric cylinder passes through the through hole on the vertical plate and is connected to the loading arm C through the connecting block and the spoke type weighing sensor C in turn. Two pneumatic calipers are provided, which are respectively fixed on both sides of the right side of the vertical plate, and linear bearings A are fixed on the left side of the vertical plate corresponding to the pneumatic calipers. Linear bearings C corresponding to the linear bearings A are fixed on both sides of the right side plate of the mounting seat A. The left ends of the guide shafts A passed through the pneumatic calipers are fixedly connected to the loading arm C after passing through the linear bearings A, and the right ends of the guide shafts A are passed through the linear bearings C;

[0023] Pulley seats are fixed on both sides of the mounting seat A, and pulleys are rotatably connected to the pulley seats. One end of the steel wire rope wound around the pulley is fixedly connected to the loading arm C, and the other end is located at the lower part of the pulley and fixedly connected to the lifting block assemblies on both sides of the lifting arm.

[0024] The test method of the automobile wheel hub bearing load friction torque tester specifically includes the following steps:

[0025] (1) Connect the test bearing fixture assembly: fix the inner ring of the test hub bearing to the right end of the mandrel of the mechanical shaft suspension assembly through the bearing inner ring connecting fixture, and fix the outer ring of the test hub bearing to the left end mandrel of the hydraulic bearing suspension system through the bearing outer ring connecting fixture to complete the installation of the entire test bearing fixture assembly;

[0026] (2) Action of hoisting weighing assembly: The weighing servo electric cylinder pushes the loading arm C, driving the steel wire ropes on both sides to pull the entire loading connector assembly upward. After the mechanical shaft suspension assembly is weighed by the installed spoke-type weighing sensor C, the pneumatic caliper locks the guide shaft A;

[0027] (3) Start the drive motor: The drive motor drives the core shaft of the mechanical shaft suspension assembly to rotate through the coupling. The core shaft of the mechanical shaft suspension assembly drives the inner ring of the test wheel hub bearing to rotate. The core shaft of the hydraulic bearing suspension system does not rotate, and the outer ring of the test wheel hub bearing connected to the hydraulic bearing suspension system does not rotate. The friction torque generated by the relative movement between the inner ring and the outer ring of the test wheel hub bearing is transmitted to the dynamic torque sensor through the hydraulic bearing suspension system for measurement;

[0028] (4) Loading radial force: When the radial force is applied to the test wheel hub bearing, the radial loading electric cylinder applies tension or thrust to the left end face of the moving seat. The right end of the loading seat hinged on the upper part of the moving seat drives the loading arm A to lift upward, converting the axial force into radial force and transmitting it to the loading column A on both sides of the loading arm A. The loading column A transmits the force to the radial loading offset distance adjustment arm, the axial loading radius adjustment arm and the lifting arm in sequence through the radial connector of the loading connector assembly. The lifting arm drives the mechanical shaft suspension assembly to transmit the radial force to the test wheel hub bearing, and the force is detected and fed back through the spoke-type weighing sensor A.

[0029] (5) Loading axial force: The axial loading servo electric cylinder loads the axial force on the loading arm B, and transmits the axial force to the loading columns B on both sides through the loading arm B. The loading columns B transmit the axial force to the radial loading offset distance adjustment arm, the axial loading radius adjustment arm and the lifting arm in turn through the axial connector of the loading connector assembly. The lifting arm drives the mechanical shaft suspension assembly to transmit the axial force to the test wheel hub bearing, and the axial force is detected and fed back by the spoke-type weighing sensor B.

[0030] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0031] 1. The automobile wheel hub bearing load friction torque tester and test method described in the present invention, the driving motor drives the core shaft of the mechanical shaft suspension assembly to rotate through the coupling, the core shaft of the mechanical shaft suspension assembly drives the inner ring of the test wheel hub bearing to rotate through the bearing inner ring connecting tooling, the friction torque generated by the relative movement of the inner ring and the outer ring of the test wheel hub bearing is transmitted to the dynamic torque sensor through the hydraulic bearing suspension system, the hydraulic bearing suspension system does not rotate, no additional torque is generated during measurement, and the friction torque of the test wheel hub bearing is only transmitted through the core shaft of the hydraulic bearing suspension system, which overcomes the disadvantage that the additional torque of the hydraulic / pneumatic bearing in the prior art cannot be eliminated, and makes the torque measurement more accurate.

[0032] 2. The automobile wheel hub bearing load friction torque testing machine and the testing method thereof described in the present invention are characterized by setting a loading connector assembly on a mechanical shaft suspension assembly, wherein both a radial loading assembly and an axial loading assembly are connected to the loading connector assembly, and a hoisting and weighing assembly is arranged directly above the mechanical shaft suspension assembly. The mechanical shaft suspension assembly is hoisted and weighed, and the influence of its own weight on the radial load is avoided by hoisting it, so that the load loading is more accurate.

[0033] 3. The automobile wheel hub bearing load friction torque tester and the test method thereof of the present invention include a torque limiter between the hydraulic bearing suspension system and the dynamic torque sensor. When the test wheel hub bearing is accidentally stuck during the test and the transmitted friction torque exceeds the limit, the torque limiter will automatically disengage to avoid the transmitted friction torque exceeding the range and damaging the dynamic torque sensor;

[0034] 4. The present invention has a compact and reasonable structure, and can truly and accurately measure the characteristics of the hub bearing friction torque under simulated working conditions of the automobile hub bearing unit. At the same time, a high and low temperature environment test chamber is added, which can realize the accurate measurement of the no-load / load friction torque of the hub bearing under normal temperature / constant temperature / high and low temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Attached Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0036] Attached Figure 2 It is the front view of the present invention.

[0037] Attached Figure 3 It is a top view of the present invention.

[0038] Attached Figure 4 It is a schematic diagram of the structure of the driving assembly of the present invention.

[0039] Attached Figure 5 It is a schematic diagram of the cross-section structure of the test bearing tooling assembly of the present invention.

[0040] Attached Figure 6 It is a structural schematic diagram of the friction torque measurement assembly of the present invention.

[0041] Attached Figure 7 It is a structural schematic diagram of the hoisting weighing assembly of the present invention.

[0042] Attached Figure 8 It is a schematic diagram of the structure of the loading connector assembly of the present invention.

[0043] Attached Fig. 9 It is a schematic structural diagram of the radial loading assembly of the present invention.

[0044] Attached Fig.10 It is a schematic structural diagram of the axial loading assembly of the present invention.

[0045] In the figure: 1. drive assembly; 11. drive motor; 12. motor mounting seat; 13. guide bar; 14. mounting base plate A; 15. cross universal joint telescopic coupling;

[0046] 2. Mechanical shaft suspension assembly;

[0047] 3. Test bearing tooling assembly; 31. Test wheel hub bearing; 32. Bearing outer ring connection tooling; 33. Bearing inner ring connection tooling; 34. High and low temperature environment test chamber;

[0048] 4. Friction torque measurement assembly; 41. Hydraulic bearing suspension system; 42. Torque limiter; 43. Coupling; 44. Dynamic torque sensor; 45. Electromagnetic clutch; 46. Sensor mounting seat; 47. Clutch mounting seat; 48. Mounting base plate B;

[0049] 5. Hoisting weighing assembly; 51. Mounting base plate C; 52. Machine base; 53. Mounting base A; 54. Weighing servo electric cylinder; 55. Guide shaft A; 56. Linear bearing A; 57. Loading arm C; 58. Pneumatic caliper; 59. Connecting block; 510. Spoke type weighing sensor C; 511. Wire rope; 512. Pulley seat; 513. Pulley; 514. Worm gear reducer A; 515. Adjusting handle A; 516. Worm gear reducer B; 517. Adjusting handle B; 518. Linear bearing C;

[0050] 6. Loading connector assembly; 61. Lifting arm; 62. Lifting block assembly; 63. Axial loading radius adjustment arm; 64. Adjustment hand wheel A; 65. Ball screw A; 66. Mounting block A; 67. Radial loading offset distance adjustment arm; 68. Mounting block B; 69. Fixed block; 610. Adjustment hand wheel B; 611. Ball screw B; 612. Radial connector; 613. Expansion sleeve A; 614. Axial connector; 615. Expansion sleeve B;

[0051] 7. Radial loading assembly; 71. Mounting base plate D; 72. Moving seat; 73. Hinge seat A; 74. Loading seat; 75. Hinge seat B; 76. Electric cylinder mounting seat; 77. Radial loading electric cylinder; 78. Loading arm A; 79. Spherical bearing A; 710. Connecting seat A; 711. Spoke type weighing sensor A; 712. Loading column A; 713. Mounting seat B; 714. Worm gear reducer C; 715. Adjusting hand wheel C;

[0052] 8. Axial loading assembly; 81. Mounting base plate E; 82. Moving base plate; 83. Linear bearing B; 84. Guide shaft B; 85. Electric cylinder fixing plate; 86. Hinge seat C; 87. Axial loading servo electric cylinder; 88. Loading arm B; 89. Spherical bearing B; 810. Connecting seat B; 811. Spoke type weighing sensor B; 812. Loading column B; 813. Mounting plate A; 814. Connecting seat C; 815. Pin; 816. Worm gear reducer D; 817. Adjusting hand wheel D; 818. Mounting plate B. DETAILED DESCRIPTION

[0053] The present invention can be explained in detail by the following examples, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0054] Combined with Figure 1-10 The automobile wheel hub bearing load friction torque tester comprises a test machine bed and a drive assembly 1, a mechanical shaft suspension assembly 2, a test bearing fixture assembly 3, a friction torque measurement assembly 4 and an axial loading assembly 8 which are sequentially connected to the upper part of the test machine bed from left to right; a loading connector assembly 6 is provided outside the mechanical shaft suspension assembly 2, and the axial loading assembly 8 and a radial loading assembly 7 which are arranged at the lower part of the test machine bed are both connected to the loading connector assembly 6;

[0055] The friction torque measurement assembly 4 includes a mounting base plate B48, a hydraulic bearing suspension system 41, a dynamic torque sensor 44, and an electromagnetic clutch 45. The hydraulic bearing suspension system 41 and a clutch mounting seat 47 are fixed on the left and right sides of the mounting base plate B48. The dynamic torque sensor 44 is fixed to the left side panel of the clutch mounting seat 47 through a sensor mounting seat 46. The hydraulic bearing suspension system 41 and the dynamic torque sensor 44 are fixedly connected through a torque limiter 42 and a coupling 43 in turn. An electromagnetic clutch 45 is provided on the right side of the dynamic torque sensor 44. The electromagnetic clutch 45 is fixed on the vertical plate of the clutch mounting seat 47; the right end of the core shaft of the mechanical shaft suspension assembly 2 drives the inner ring of the test hub bearing 31 to rotate through the bearing inner ring connecting fixture 33 of the test bearing fixture assembly 3, and the outer ring of the test hub bearing 31 is fixedly connected to the hydraulic bearing suspension system 41 through the bearing outer ring connecting fixture 32; the test hub bearing 31 is not limited to the first, second and third generation hub bearings, and the test hub bearing 31 is allowed to be installed with attached brake discs, steering knuckles and tires, and the operating status can also be monitored by installing temperature sensors and vibration sensors;

[0056] During operation, the driving component 1 drives the core shaft of the mechanical shaft suspension component 2 to rotate, thereby driving the inner ring of the test bearing fixture component 3 to rotate. The hydraulic bearing suspension system 41 is fixedly connected to the outer ring of the test hub bearing 31 through the bearing outer ring connecting fixture 32. The hydraulic bearing suspension system 41 is a prior art. The liquid floating bearing itself has a high axial load and radial load bearing capacity. It does not rotate during measurement, so no additional torque is generated. It is only used to transmit friction torque and support radial and axial loads. The friction torque generated by the relative movement between the inner ring and the outer ring of the test hub bearing 31 passes through the bearing outer ring connecting fixture 32 in sequence through the hydraulic bearing suspension system 41, the torque limiter 42, the coupling The torque of the hydraulic bearing suspension system 41 is transmitted to the dynamic torque sensor 44 for measurement by the shaft 43. When the friction torque transmitted exceeds the limit, such as when the test hub bearing 31 is accidentally stuck during the test, the torque limiter 42 will automatically disengage to avoid the friction torque transmitted exceeding the range and damaging the dynamic torque sensor 44. The electromagnetic clutch 45 is in a closed state during the test, so that the dynamic torque sensor 44 performs static torque measurement. During debugging or maintenance, the electromagnetic clutch 45 can be opened to allow the hydraulic bearing suspension system 41 to be manually rotated, avoiding the inconvenience of debugging or maintenance caused by directly using the static torque sensor; the hydraulic bearing suspension system 41 is equipped with an oil air conditioning cooling unit to keep the liquid floating bearing at the optimal working temperature.

[0057] Furthermore, a high and low temperature environment test chamber 34 is provided on the outside of the test hub bearing 31. The high and low temperature environment test chamber 34 is a top and bottom snap-fit ​​structure, which can provide a simulated environment for the test hub bearing 31, and can measure the friction torque under normal temperature / constant temperature / high temperature / low temperature simulated environment. The high and low temperature environment test chamber 34 is a prior art, so it will not be described in detail.

[0058] Furthermore, the drive assembly 1 includes a drive motor 11 and a mounting base A14, on which two parallel guide strips 13 are fixed at intervals, and a motor mounting seat 12 is slidably connected to the guide strips 13. The drive motor 11 is fixed on the motor mounting seat 12, and a cross universal joint telescopic coupling 15 hinged to the left end of the core shaft of the mechanical shaft suspension assembly 2 is provided on the output shaft of the drive motor 11; the drive motor 11 is used to output power, and the motor mounting seat 12 can be adjusted and fixed on the mounting base A14 through the guide strips 13, and the drive motor 11 and the mechanical shaft suspension assembly 2 are connected. A cross universal joint telescopic coupling 15 is arranged between the core shafts of component 2 to compensate for the problem of angular deflection caused by the inner ring of the test hub bearing 31 being subjected to a large load and a large loading radius; the mechanical shaft suspension component 2 is a prior art, and adopts two sets of non-contact sealed angular contact bearings as support, which can withstand large axial loads and radial loads while bearing high speeds. In addition, the operating status of the bearing can be monitored by setting a temperature sensor and a vibration sensor. The function of the mechanical shaft suspension component 2 is to load the axial load and radial load to the rotating end of the test hub bearing 31.

[0059] Furthermore, the loading connector assembly 6 includes a lifting arm 61, a fixing block 69, an axial loading radius adjusting arm 63 and a mounting block A66. Lifting block assemblies 62 are fixed on both sides of the lifting arm 61. The lifting block assembly 62 is fixedly connected to the lifting weighing assembly 5. The lifting arm 61 is connected to the outside of the mechanical shaft suspension assembly 2 through a central circular hole. Both ends of the lifting arm 61 are symmetrically installed with "L"-shaped axial loading radius adjusting arms 63. A cross-shaped radial loading offset distance adjusting arm 67 is provided on the outside of any axial loading radius adjusting arm 63. The right side of the offset distance adjustment arm 67 is provided with an axial connection piece 614 hingedly connected through a radial connection piece 612, and the end of the axial connection piece 614 is provided with a tightening sleeve B615 fixed to the axial loading assembly 8, and the radial loading assembly 7 is connected to the radial connection piece 612; a mounting block A66 is provided on the outer surface of the radial loading offset distance adjustment arm 67, and the protrusion extending from the inner surface of the mounting block A66 passes through the transverse guide groove of the radial loading offset distance adjustment arm 67, and is fixedly connected to the fixing block 69 provided on the vertical guide groove of the axial loading radius adjustment arm 63;

[0060] A ball screw A65 is vertically penetrated on the mounting block A66, and an adjusting hand wheel A64 at the upper end of the ball screw A65 is fixed to a fixing plate on the upper end surface of the axial loading radius adjusting arm 63, and a lower end base of the ball screw A65 is fixed to a bottom plate of the axial loading radius adjusting arm 63. The ball screw A65 drives the radial loading offset distance adjusting arm 67 to adjust up and down along the vertical guide groove on the axial loading radius adjusting arm 63 through the adjusting hand wheel A64;

[0061] A mounting block B68 is fixed on the outside of the mounting block A66, a transverse ball screw B611 fixed on the radial load offset distance adjustment arm 67 cooperates with a ball nut fixed in the inner hole of the mounting block B68, and an adjustment hand wheel B610 at the end of the ball screw B611 drives the radial load offset distance adjustment arm 67 to adjust its position in the horizontal direction;

[0062] The loading connector assembly 6 is installed on the outside of the mechanical shaft suspension assembly 2, and is used to connect the radial loading assembly 7 and the axial loading assembly 8 to apply a corresponding load to the test hub bearing 31; when adjusting, the adjusting hand wheel A64 is rotated to drive the radial loading offset distance adjustment arm 67, the mounting block A66, the radial connector 612, the axial connector 614 and the ball screw B611 to adjust in the vertical direction, and the protrusion extending from the inner surface of the mounting block A66 moves along the vertical guide groove on the axial loading radius adjustment arm 63; the adjusting hand wheel B610 is rotated to make the ball screw B611 drive the radial loading offset distance adjustment arm 67 to move in the horizontal direction, so that the radial connector 612 and the axial connector 614 both move with the movement of the radial loading offset distance adjustment arm 67.

[0063] Furthermore, the radial loading assembly 7 includes a mounting base plate D71, a moving seat 72, a loading arm A78 and a mounting seat B713. The mounting base plate D71 and the mounting seat B713 are respectively fixed to the bottom plate of the lower part of the test machine body by bolts in parallel and at intervals. The moving seat 72 is slidably arranged in a guide groove on the mounting base plate D71. A loading seat 74 is provided on the upper part of the moving seat 72 and is hingedly connected by a hinge seat A73. The loading arm A78 is located on a step surface on one side of the upper side of the moving seat 72 and is fixed to the lower side of the loading seat 74 by bolts. Both ends of the loading arm A78 are provided with connection seats connected in sequence by joint bearings A79. A710, a spoke-type weighing sensor A711 and a loading column A712, the loading column A712 is inserted into the inner hole of the radial connecting member 612, and a tightening sleeve A613 is provided between the inner hole of the radial connecting member 612 and the loading column A712; the left side plate of the loading seat 74 is connected to the electric cylinder mounting seat 76 of the radial loading electric cylinder 77 through a hinge seat B75, and the output end of the radial loading electric cylinder 77 is connected to the left side surface of the moving seat 72 through a spherical bearing C; a worm gear reducer C714 is fixed on the mounting seat B713, and the screw end of the worm gear reducer C714 is fixedly connected to the right side surface of the moving seat 72;

[0064] Turn the adjusting hand wheel C715 at the screw end of the worm gear reducer C714 to adjust and fix the position of the moving seat 72 on the mounting base plate D71. When a radial load is applied, the horizontally arranged radial loading electric cylinder 77 loads an axial force on the left end face of the moving seat 72. The right end of the loading seat 74 hinged on the upper part of the moving seat 72 drives the loading arm A78 to lift upward, converts the axial force into a radial force and transmits it to the loading columns A712 on both sides of the loading arm A78. The loading columns A712 then transmit the radial force to the test hub bearing 31 through the loading connector assembly 6, and the radial force is detected and fed back by the spoke-type weighing sensor A711.

[0065] Furthermore, the axial loading assembly 8 includes a mounting base plate E81 and a loading arm B88. The mounting base plate E81 is vertically mounted on the right end surface of the test bed. A movable base plate 82 and an electric cylinder fixing plate 85 are arranged parallel to each other on the outside of the mounting base plate E81. The protrusions on the inner surface of the movable base plate 82 are slidably arranged in the vertical guide groove on the mounting base plate E81. Four guide shafts B84 arranged in a square are arranged between the movable base plate 82 and the electric cylinder fixing plate 85. Linear bearings B83 are arranged on the guide shafts B84. The loading arm B88 is fixed between the four linear bearings B83. A hinge seat C8 is provided on the outer end surface of the electric cylinder fixing plate 85. 6, the output end of the axial loading servo electric cylinder 87 is connected to the loading arm B88 through a spherical bearing D, and connecting seats B810 connected through spherical bearings B89 are provided at both ends of the loading arm B88, and spoke-type weighing sensors B811 and loading columns B812 are connected to the connecting seats B810 in sequence, and the loading columns B812 are fixedly connected to the axial connecting pieces 614 through expansion sleeves B615; a mounting plate A813 is fixed on the upper surface between the moving base plate 82 and the electric cylinder fixing plate 85, and a lifting component for driving the moving base plate 82 to move up and down is provided on the mounting plate A813;

[0066] When applying an axial load, the horizontally arranged axial loading servo electric cylinder 87 loads an axial force on the loading arm B88, so that the loading arm B88 drives the linear bearing B83 to slide on the guide shaft B84. Since the loading arm B88 and the loading column B812 are arranged vertically and are connected by the joint bearing B89 and the connecting seat B810, the loading arm B88 transfers the axial force to the loading columns B812 on both sides. The loading column B812 transfers the axial force to the radial loading offset distance adjustment arm 67, the axial loading radius adjustment arm 63 and the lifting arm 61 in turn through the axial connecting piece 614 of the loading connector assembly 6. The lifting arm 61 drives the mechanical shaft suspension assembly 2 to transfer the axial force to the test hub bearing 31, and the force is detected and fed back by the spoke-type weighing sensor B811.

[0067] Furthermore, the lifting assembly includes a connecting seat C814, a worm gear reducer D816 and an adjusting hand wheel D817. The screw of the worm gear reducer D816 is fixed in the "U"-shaped groove of the connecting seat C814 by a pin 815. The base of the worm gear reducer D816 is fixed to the upper part of the mounting base E81. The hand crank end of the adjusting hand wheel D817 is connected to the mounting plate B818 on one end surface of the mounting base E81. The rod end of the adjusting hand wheel D817 is connected to the worm gear. The worm reducer D816 is connected to form a linkage structure; the lifting assembly is used to adjust the height position of the axial loading servo electric cylinder 87, the loading arm B88 and the loading column B812, so that the loading column B812 is fixedly connected to the axial connecting piece 614 in the horizontal direction. When adjusting, turn the adjusting hand wheel D817 to move the base plate 82 with the axial loading servo electric cylinder 87, the loading arm B88 and the loading column B812 up and down along the vertical guide groove on the mounting base plate E81 to adjust the position.

[0068] Furthermore, it also includes a hoisting weighing assembly 5 arranged on the test bed, the hoisting weighing assembly 5 includes a mounting base C51, a machine base 52, a loading arm C57 and a pneumatic caliper 58, the mounting base C51 is fixed to the upper part of the test bed, the machine base 52 is slidably arranged on the slide groove above the mounting base C51 through the lower slide bar, the mechanical axis suspension assembly 2 is located in the inner cavity of the machine base 52, a mounting seat A53 is slidably arranged on the upper top plate of the machine base 52, the mounting seat A53 is adjusted in position by a worm gear reducer A514 fixed on the side of the machine base 52, a vertical plate is fixed on the left side of the upper top plate of the machine base 52, and a weighing servo is fixed on the middle part of the upper part of the mounting seat A53 Servo electric cylinder 54, the output end of the weighing servo electric cylinder 54 passes through the through hole on the vertical plate and is connected to the loading arm C57 through the connecting block 59 and the spoke type weighing sensor C510 in turn. Two pneumatic calipers 58 are provided, which are fixed on both sides of the right side of the vertical plate respectively. Linear bearings A56 are fixed on the left side of the vertical plate corresponding to the pneumatic calipers 58. Linear bearings C518 corresponding to the linear bearings A56 are fixed on both sides of the right side plate of the mounting seat A53. The left ends of the guide shafts A55 passing through the pneumatic calipers 58 are fixedly connected to the loading arm C57 after passing through the linear bearings A56, and the right ends of the guide shafts A55 are passed through the linear bearings C518.

[0069] Pulley seats 512 are fixed on both sides of the mounting seat A53, and pulleys 513 are rotatably connected to the pulley seats 512. One end of the steel wire rope 511 wound around the pulley 513 is fixedly connected to the loading arm C57, and the other end is located at the lower part of the pulley 513 and fixedly connected to the lifting block assemblies 62 on both sides of the lifting arm 61.

[0070] The hoisting weighing assembly 5 is fixed on the top of the mechanical shaft suspension assembly 2 through the machine base 52 on the mounting base plate C51. By hoisting it, the influence of its own weight on the radial load is avoided, so that the load loading is more accurate. Specifically, the adjusting handle B517 adjusts the position of the machine base 52 on the mounting base plate C51 and fixes it through the worm gear reducer B516. The adjusting handle A515 at the screw end of the worm gear reducer A514 adjusts the position of the mounting seat A53 on the machine base 52 and fixes it. The weighing servo electric cylinder 54 is connected to the loading arm C57 through the connecting block 59 and the spoke type weighing sensor C510. The output end of the weighing servo electric cylinder 54 is pushed out. , driving the loading arm C57 to move to the left, while the guide shafts A55 on both sides play a guiding role, sliding in the linear bearings A56 and C518 on both sides, and as the output end of the weighing servo electric cylinder 54 pushes the loading arm C57 to move to the left, it drives the steel wire ropes 511 on both sides to pull the lifting block assembly 62, so that the entire loading connector assembly 6 is lifted, and after the mechanical shaft suspension assembly 2 is weighed by the installed spoke-type weighing sensor C510, the pneumatic caliper 58 locks the guide shaft A55, that is, locks the lifting position, thereby offsetting the influence of its own weight on the radial load, and does not affect the accurate value of the friction torque measurement of the test hub bearing 31.

[0071] The test method of the automobile wheel hub bearing load friction torque tester specifically includes the following steps:

[0072] (1) The inner ring of the test hub bearing 31 is fixedly connected to the right end of the core shaft of the mechanical shaft suspension assembly 2 through the bearing inner ring connecting fixture 33, and the outer ring of the test hub bearing 31 is fixedly connected to the left end core shaft of the hydraulic bearing suspension system 41 through the bearing outer ring connecting fixture 32, completing the installation of the entire test bearing fixture assembly 3;

[0073] (2) The weighing servo electric cylinder 54 of the hoisting weighing assembly 5 pushes the loading arm C57, driving the steel wire ropes 511 on both sides to pull the entire loading connector assembly 6 upward. After the mechanical shaft suspension assembly 2 is weighed by the installed spoke-type weighing sensor C510, the pneumatic caliper 58 locks the guide shaft A55;

[0074] (3) The drive motor 11 is started, and the drive motor 11 drives the core shaft of the mechanical shaft suspension assembly 2 to rotate through the coupling. The core shaft of the mechanical shaft suspension assembly 2 drives the inner ring of the test hub bearing 31 to rotate, and the core shaft of the hydraulic bearing suspension system 41 does not rotate. The outer ring of the test hub bearing 31 connected to the hydraulic bearing suspension system 41 does not rotate either. The friction torque generated by the relative movement between the inner ring and the outer ring of the test hub bearing 31 is transmitted to the dynamic torque sensor 44 through the hydraulic bearing suspension system 41 for measurement;

[0075] (4) During the measurement process, when the radial force is applied to the test wheel hub bearing 31, the radial loading electric cylinder 77 applies a tensile force or a thrust force to the left end face of the moving seat 72, and the right end of the loading seat 74 hinged on the upper part of the moving seat 72 drives the loading arm A78 to lift upward, converting the axial force into a radial force and transmitting it to the loading columns A712 on both sides of the loading arm A78. The loading columns A712 transmit the force to the radial loading offset distance adjustment arm 67, the axial loading radius adjustment arm 63 and the hoisting arm 61 in sequence through the radial connector 612 of the loading connector assembly 6. The hoisting arm 61 drives the mechanical shaft suspension assembly 2 to transmit the radial force to the test wheel hub bearing 31, and the radial force is detected and fed back through the spoke-type weighing sensor A711.

[0076] When the test wheel hub bearing 31 is loaded with axial force, the axial loading servo electric cylinder 87 loads the axial force on the loading arm B88, and transmits the axial force to the loading columns B812 on both sides through the loading arm B88. The loading column B812 transmits the axial force to the radial loading offset distance adjustment arm 67, the axial loading radius adjustment arm 63 and the lifting arm 61 in turn through the axial connector 614 of the loading connector assembly 6. The lifting arm 61 drives the mechanical shaft suspension assembly 2 to transmit the axial force to the test wheel hub bearing 31, and the axial force is detected and fed back by the spoke-type weighing sensor B811.

[0077] The parts not described in detail in this invention are prior art.

[0078] The embodiments selected herein for the purpose of disclosing the invention are currently considered to be suitable, but it should be understood that the invention is intended to include all changes and modifications of the embodiments that fall within the scope of the concept and invention.

Claims

1. An automobile wheel hub bearing load friction torque tester, comprising a test machine bed and a drive assembly, a mechanical shaft suspension assembly, a test bearing fixture assembly, a friction torque measurement assembly and an axial loading assembly connected to the upper part of the test machine bed from left to right, characterized in that: A loading connector assembly is provided on the outside of the mechanical shaft suspension assembly, and the axial loading assembly and the radial loading assembly arranged at the bottom of the test machine bed are both connected to the loading connector assembly; the friction torque measurement assembly includes a mounting base plate B, a hydraulic bearing suspension system, a dynamic torque sensor, and an electromagnetic clutch. The hydraulic bearing suspension system and the clutch mounting seat are fixed on the left and right sides of the mounting base plate B at intervals. The dynamic torque sensor is fixed to the left panel of the clutch mounting seat through the sensor mounting seat. The hydraulic bearing suspension system and the dynamic torque sensor are fixedly connected through a torque limiter and a coupling in turn. An electromagnetic clutch fixedly connected through a coupling is provided on the right side of the dynamic torque sensor, and the electromagnetic clutch is fixed to the vertical plate of the clutch mounting seat; the right end of the core shaft of the mechanical shaft suspension assembly drives the inner ring of the test hub bearing to rotate through the bearing inner ring connecting fixture of the test bearing fixture assembly, and the outer ring of the test hub bearing is fixedly connected to the hydraulic bearing suspension system through the bearing outer ring connecting fixture.

2. The automobile wheel hub bearing load friction torque testing machine according to claim 1, characterized in that: A high and low temperature environment test chamber is provided outside the test wheel hub bearing.

3. The automobile wheel hub bearing load friction torque testing machine according to claim 1, characterized in that: The driving assembly includes a driving motor and a mounting base A. Two parallel guide strips are fixed at intervals on the mounting base A. A motor mounting seat is slidably connected to the guide strips. The driving motor is fixed on the motor mounting seat. A cross universal joint telescopic coupling is provided on the output shaft of the driving motor, which is hinged to the left end of the core shaft of the mechanical shaft suspension assembly.

4. The automobile wheel hub bearing load friction torque testing machine according to claim 1, characterized in that: The loading connector assembly includes a lifting arm, a fixing block, an axial loading radius adjustment arm and a mounting block A. Lifting block assemblies are fixed on both sides of the lifting arm. The lifting arm is connected to the outside of the mechanical shaft suspension assembly through a central circular hole. "L"-shaped axial loading radius adjustment arms are symmetrically installed at both ends of the lifting arm. A cross-shaped radial loading offset distance adjustment arm is provided on the outside of any axial loading radius adjustment arm. An axial connector hingedly connected through a radial connector is provided on the right side of the radial loading offset distance adjustment arm. A tightening sleeve B fixed to the axial loading assembly is provided at the end of the axial connector, and a radial loading assembly is connected to the radial connector. A mounting block A is provided on the outer surface of the radial loading offset distance adjusting arm, and a protrusion extending from the inner surface of the mounting block A passes through the transverse guide groove of the radial loading offset distance adjusting arm and is fixedly connected with a fixing block provided on the vertical guide groove of the axial loading radius adjusting arm; A ball screw A is vertically passed through the mounting block A. An adjusting hand wheel A at the upper end of the ball screw A is fixed to a fixing plate on the upper end surface of the axial loading radius adjusting arm. A base at the lower end of the ball screw A is fixed to the bottom plate of the axial loading radius adjusting arm. The ball screw A drives the radial loading offset distance adjusting arm to be adjusted up and down along the guide groove on the axial loading radius adjusting arm through the adjusting hand wheel A. A mounting block B is fixed on the outside of the mounting block A. The transverse ball screw B fixed on the radial load offset distance adjustment arm cooperates with the ball nut fixed in the inner hole of the mounting block B. The adjustment handwheel B at the end of the ball screw B drives the radial load offset distance adjustment arm to adjust its position in the horizontal direction.

5. The automobile wheel hub bearing load friction torque testing machine according to claim 1, characterized in that: The radial loading assembly includes a mounting base plate D, a moving seat, a loading arm A and a mounting base B. The mounting base plate D and the mounting base B are respectively fixed on the lower base plate of the test machine body by bolts in parallel and at intervals. The moving seat is slidably arranged in a guide groove on the mounting base plate D. A loading seat hingedly connected by a hinge seat A is arranged on the upper part of the moving seat. The loading arm A is located on a step surface on one side of the upper side of the moving seat and is fixed to the lower side of the loading seat by bolts. Both ends of the loading arm A are provided with a connecting seat A, a spoke-type weighing sensor A and a loading column A connected in sequence by a spherical bearing A. The loading column A is penetrated in the inner hole of the radial connecting piece, and a tightening sleeve A is arranged between the inner hole of the radial connecting piece and the loading column A. The left side plate of the loading seat is connected to the cylinder body of the radial loading electric cylinder through the hinge seat B, and the output end in the radial loading electric cylinder is connected to the left side surface of the moving seat through the spherical bearing C. A worm gear reducer C is fixed on the mounting base B, and the screw end of the worm gear reducer C is fixedly connected to the right side surface of the moving seat.

6. The automobile wheel hub bearing load friction torque testing machine according to claim 1, characterized in that: The axial loading assembly includes a mounting base plate E and a loading arm B. The mounting base plate E is vertically mounted on the right end surface of the test bed. A movable base plate and an electric cylinder fixing plate are arranged at intervals and in parallel outside the mounting base plate E. The convex blocks on the inner surface of the movable base plate are slidably arranged in the vertical guide groove on the mounting base plate E. Four guide shafts B arranged in a square are arranged between the movable base plate and the electric cylinder fixing plate. Linear bearings B are arranged on the guide shafts B. The loading arm B is fixed between the four linear bearings B. An axial loading servo electric cylinder is arranged on the outer end surface of the electric cylinder fixing plate. The output end of the axial loading servo electric cylinder is connected to the loading arm B through a spherical bearing D. Connecting seats B connected through spherical bearings B are arranged at both ends of the loading arm B. Spoke-type weighing sensors B and loading columns B are connected to the connecting seats B in sequence. The loading columns B are fixedly connected to the axial connecting pieces through expansion sleeves B respectively. A mounting plate A is fixed on the upper surface between the movable base plate and the electric cylinder fixing plate. A lifting assembly for driving the movable base plate to move up and down is arranged on the upper surface of the mounting plate A.

7. The automobile wheel hub bearing load friction torque testing machine according to claim 6, characterized in that: The lifting assembly includes a connecting seat C, a worm gear reducer D and an adjusting handwheel D. The screw of the worm gear reducer D is fixed in a "U"-shaped groove of the connecting seat C by a pin. The base of the worm gear reducer D is fixed on the upper part of the mounting base plate E. The hand-cranked end of the adjusting handwheel D is connected to the mounting plate B on one end surface of the mounting base plate E. The rod end of the adjusting handwheel D is connected to the worm gear reducer D to form a linkage structure.

8. The automobile wheel hub bearing load friction torque testing machine according to claim 1, characterized in that: It also includes a hoisting weighing assembly arranged on the test bed, the hoisting weighing assembly includes a mounting base plate C, a machine base, a loading arm C and a pneumatic caliper, the mounting base plate C is fixed to the upper part of the test bed, the machine base is slidingly arranged on the slide groove above the mounting base plate C through the lower slide bar, a worm gear reducer B for adjusting the sliding of the machine base is arranged on the left side of the machine base, the mechanical axis suspension assembly is located in the inner cavity of the machine base, a mounting seat A is slidingly arranged on the upper top plate of the machine base, the mounting seat A is adjusted in position by the worm gear reducer A fixed on the side of the machine base, a vertical plate is fixed on the left side of the upper top plate of the machine base, a weighing servo electric cylinder is fixed on the middle part of the upper part of the mounting seat A, the output end of the weighing servo electric cylinder passes through the through hole on the vertical plate, and is connected to the loading arm C in turn through the connecting block and the spoke type weighing sensor C, two pneumatic calipers are arranged, which are respectively fixed on both sides of the right side of the vertical plate, linear bearings A are fixed at the corresponding pneumatic calipers on the left side of the vertical plate, and linear bearings C corresponding to the linear bearings A are fixed on both sides of the right side plate of the mounting seat A, The left end of the guide shaft A passing through the pneumatic caliper passes through the linear bearing A and is fixedly connected to the loading arm C, and the right end of the guide shaft A passes through the linear bearing C; Pulley seats are fixed on both sides of the mounting seat A, and pulleys are rotatably connected to the pulley seats. One end of the steel wire rope wound around the pulley is fixedly connected to the loading arm C, and the other end is located at the lower part of the pulley and fixedly connected to the lifting block assemblies on both sides of the lifting arm.

9. The test method of the automobile hub bearing load friction torque tester according to any one of claims 1 to 8, comprising the following steps: (1) Connect the test bearing fixture assembly: fix the inner ring of the test hub bearing to the right end of the mandrel of the mechanical shaft suspension assembly through the bearing inner ring connecting fixture, and fix the outer ring of the test hub bearing to the left end mandrel of the hydraulic bearing suspension system through the bearing outer ring connecting fixture to complete the installation of the entire test bearing fixture assembly; (2) Action of hoisting weighing assembly: The weighing servo electric cylinder pushes the loading arm C, driving the steel wire ropes on both sides to pull the entire loading connector assembly upward. After the mechanical shaft suspension assembly is weighed by the installed spoke-type weighing sensor C, the pneumatic caliper locks the guide shaft A; (3) Start the drive motor: The drive motor drives the core shaft of the mechanical shaft suspension assembly to rotate through the coupling. The core shaft of the mechanical shaft suspension assembly drives the inner ring of the test wheel hub bearing to rotate. The core shaft of the hydraulic bearing suspension system does not rotate, and the outer ring of the test wheel hub bearing connected to the hydraulic bearing suspension system does not rotate. The friction torque generated by the relative movement between the inner ring and the outer ring of the test wheel hub bearing is transmitted to the dynamic torque sensor through the hydraulic bearing suspension system for measurement; (4) Loading radial force: When the radial force is applied to the test wheel hub bearing, the radial loading electric cylinder applies tension or thrust to the left end face of the moving seat. The right end of the loading seat hinged on the upper part of the moving seat drives the loading arm A to lift upward, converting the axial force into radial force and transmitting it to the loading column A on both sides of the loading arm A. The loading column A transmits the force to the radial loading offset distance adjustment arm, the axial loading radius adjustment arm and the lifting arm in sequence through the radial connector of the loading connector assembly. The lifting arm drives the mechanical shaft suspension assembly to transmit the radial force to the test wheel hub bearing, and the force is detected and fed back through the spoke-type weighing sensor A. (5) Loading axial force: The axial loading servo electric cylinder loads the axial force on the loading arm B, and transmits the axial force to the loading columns B on both sides through the loading arm B. The loading columns B transmit the axial force to the radial loading offset distance adjustment arm, the axial loading radius adjustment arm and the lifting arm in turn through the axial connector of the loading connector assembly. The lifting arm drives the mechanical shaft suspension assembly to transmit the axial force to the test wheel hub bearing, and the axial force is detected and fed back by the spoke-type weighing sensor B.

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