A kind of dual-purpose testing machine for determining effective service life of bearing lubricating oil and grease for new energy vehicles

Abstract

The application discloses a kind of dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicle, including testing machine head and drive motor, the testing machine head includes positioning shaft, lubricating grease test component, lubricating oil test component, first bearing seat, pre-pressing device, disc spring and heater, the drive motor is drivingly connected with positioning shaft, two first bearing seats are respectively sleeved on positioning shaft, the pre-pressing device and disc spring are arranged on the side of first bearing seat, the both ends of disc spring are respectively in axial abutment with pre-pressing device and the first bearing seat, and the heater is arranged on the first bearing seat;When testing the effective life of bearing lubricating grease, lubricating grease test component is installed on positioning shaft;When testing the effective life of bearing lubricating oil, lubricating oil test component is installed on positioning shaft, so that the application can be used for two purposes, and the testing machine head has two test bearings, and the test results obtained are efficient.

Description

Technical Field

[0001] This invention belongs to the field of bearing testing technology, and specifically relates to a dual-purpose testing machine for determining the effective life of lubricating oil and grease in bearings used in new energy vehicles. Background Technology

[0002] New energy vehicles refer to automobiles that use unconventional vehicle fuels as their power source (or use conventional vehicle fuels but employ new onboard power devices), integrating advanced technologies in vehicle power control and drive, resulting in vehicles with advanced technical principles and new technologies and structures. Considering China's energy resource situation and international automotive technology development trends, it is projected that by 2025, conventional gasoline vehicles will account for only about 50% of passenger vehicles in China, while new energy vehicles such as electric vehicles, natural gas vehicles, and biofuel vehicles will develop rapidly.

[0003] The new energy vehicle industry has the highest requirements for quality, reliability, stability, and cost-effectiveness. Drive bearings used in new energy vehicle transmissions, drive axles, transfer cases, generators, clutches, and fans require longer service life and consistently excellent quality performance. Lubricating oil and grease are essential for the use of bearings in new energy vehicles, thus necessitating the determination of the effective life of the lubricating oil and grease in these bearings. Generally, a rolling bearing grease testing machine (hereinafter referred to as the testing machine) is used to test the effective life of the lubricating grease in new energy vehicle bearings. Figure 1 As shown, its structure includes a testing head and a drive motor 6'. The testing head includes a positioning shaft 1', a testing bearing 2', an auxiliary bearing 3', a disc spring 4', and a preload device 5'. The testing bearing and the auxiliary bearing are respectively installed at both ends of the positioning shaft. Before the test, grease is applied to the surface of the testing bearing, and then the testing bearing is installed on the positioning shaft. During the test, an axial load is applied to the testing bearing through the disc spring and the preload device. The drive motor drives the positioning bearing to rotate to provide circumferential torque to the testing bearing. The testing bearing is then heated and kept warm. When the friction torque of the testing bearing increases due to poor lubrication, causing the power of the drive motor to exceed the limit value and lasting for 6-8 seconds, the test ends, and the test time of bearing failure is recorded. The existing testing machine has the following defects:

[0004] 1. Traditional testing machines can only test the effective life of bearing grease, and cannot test the effective life of bearing lubricating oil. Therefore, one testing machine cannot be used to test the effective life of two bearing lubricants, and cannot achieve dual-purpose use, resulting in high testing costs.

[0005] 2. The existing testing machine's positioning shaft has a support 7' installed at one end of the auxiliary bearing. The auxiliary bearing only serves as an auxiliary support, resulting in only one test bearing inside the testing head. With only one test bearing, the probability of bearing failure is low, leading to low efficiency in obtaining test results. Furthermore, the auxiliary bearing also has an oil box structure for circulating lubricating oil and an oil seal structure for sealing the lubricating oil. Frequent installation and maintenance of the auxiliary bearing may cause oil seal failure during testing, resulting in lubricating oil leakage and contamination of the testing head. Summary of the Invention

[0006] The purpose of this invention is to provide a dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease in new energy vehicles, which solves the problems of existing testing machines that can only test the effective life of bearing lubricating grease, and the low probability of bearing failure and low efficiency of test results when the testing head only has one test bearing.

[0007] To achieve the above objectives, the solution of the present invention is as follows: a dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicles, comprising a testing head and a drive motor. The testing head includes a positioning shaft, a grease testing assembly, a lubricating oil testing assembly, two first bearing seats, a preload device, and a disc spring. The drive motor drives and connects to the positioning shaft. The two first bearing seats are respectively sleeved on both ends of the positioning shaft. The preload device and the disc spring are disposed on one side of one of the first bearing seats. The two ends of the disc spring are respectively axially abutting against the preload device and the first bearing seat.

[0008] The grease testing assembly is provided in two sets. Each set of the grease testing assembly includes a first test bearing, a first gasket, a first transition sleeve, and a cover. The first test bearing and the first gasket are fitted on the first transition sleeve. When testing the effective life of the bearing grease, the two first transition sleeves are respectively fitted on both ends of the positioning shaft, and the first test bearing and the first gasket are located between the first transition sleeve and the first bearing seat. The outer ring of the first test bearing abuts against the inner circumference of the first bearing seat. The cover is placed on the outside of the first test bearing and abuts against the first test bearing.

[0009] The lubricating oil test assembly is provided in two sets. Each set of the lubricating oil test assembly includes a second test bearing, a second bearing housing, a second transition sleeve, and a test oil box. The second bearing housing is fitted onto the second transition sleeve. The second test bearing is located between the second transition sleeve and the second test bearing, and the outer ring of the second test bearing abuts against the inner circumference of the second bearing housing. When testing the effective life of the bearing lubricating oil, the two second transition sleeves are respectively fitted onto the two ends of the positioning shaft. The second bearing housing abuts against the inner circumference of the first bearing housing. The test oil box is located on the outside of the second test bearing and abuts against the second test bearing.

[0010] Furthermore, the inner ends of the first transition sleeve and the second transition sleeve are respectively provided with a first protruding edge and a second protruding edge. The first gasket is located between the first test bearing and the first protruding edge. The first protruding edge abuts against the first gasket during the process of pulling out the first transition sleeve, and the second protruding edge abuts against the second test bearing during the process of pulling out the second transition sleeve.

[0011] Furthermore, the first transition sleeve and the second transition sleeve are removed by a puller. The puller is equipped with fixed claws. The outer ends of the first transition sleeve and the second transition sleeve are provided with notches that cooperate with the claws. The first transition sleeve and the second transition sleeve are provided with an annular groove communicating with the notch on the inner side of the notch. The claws extend into the annular groove through the notch. The puller rotates to make the claws displace the notch and abut against the side wall of the annular groove to pull out the first transition sleeve or the second transition sleeve.

[0012] Furthermore, the test oil box contains lubricating oil and is equipped with an oil inlet channel and an oil outlet channel connecting the second test bearing. The oil inlet channel and the oil outlet channel are connected to continuously drip lubricating oil onto the second test bearing. A sealing oil seal is provided between the second bearing housing and the second transition sleeve, and an oil seal is also provided between the second bearing housing and the test oil box and the first bearing housing.

[0013] Furthermore, sealing rings are provided between the first transition sleeve and the positioning shaft, and between the second transition sleeve and the positioning shaft.

[0014] Furthermore, it also includes a base, on which two test heads and two drive motors are arranged radially side by side, and the positioning shafts of the two test heads are axially connected to the two drive motors respectively.

[0015] Furthermore, the base is provided with a head plate for mounting the test head, the head plate has a rotation center on the base and rotates relative to the base at the rotation center, and a double-sided locator is provided between one end of the two head plates; the base is also provided with an axially sliding motor base plate, the motor base plate is used for mounting the drive motor.

[0016] Furthermore, the test head also includes a housing, and the positioning shaft, grease test assembly, lubricating oil test assembly, first bearing seat, preload device, and disc spring are all housed inside the housing. One end of the positioning shaft extends out of the housing and is connected to the drive motor. The housing includes a shell and a front cover and a rear cover located at the front and rear ends of the shell, respectively. Supports are provided between the front end of the shell and the front cover, and between the rear end of the shell and the rear cover. The bottom of the support is connected to the bottom plate of the test head, and the support is connected to the outer periphery of the first bearing seat. The two first bearing seats are symmetrically arranged.

[0017] Furthermore, the preload device includes a worm gear, a worm, a nut sleeve, a bushing, and a motor. The bushing is slidably mounted on the positioning shaft, and one end of the bushing abuts against a disc spring. The nut sleeve is mounted on the bushing and threadedly connected to it. The worm gear is mounted on the nut sleeve and fixedly connected to it via a key. The worm meshes with the worm gear. The motor drives the worm to rotate, which in turn drives the worm gear and the nut sleeve to rotate, thereby driving the bushing to move axially and push against the first bearing seat to provide axial load.

[0018] Furthermore, a pressure sensor is provided between one end of the bushing and the disc spring, and the pressure sensor is connected to the motor signal.

[0019] After adopting the above solution, the beneficial effects of the present invention are as follows:

[0020] 1. Since the test bearings used for grease testing are generally larger than those used for lubricating oil testing (i.e., the outer diameter of the first test bearing is larger than the outer diameter of the second test bearing), and the inner diameter of the first test bearing may also differ from that of the second test bearing, this invention provides a first transition sleeve and a second transition sleeve to mount the first and second test bearings onto a positioning shaft. Furthermore, a second bearing seat is provided on the outer circumference of the second test bearing, abutting against the inner circumference of the first bearing seat. This ensures that the outer diameter of the second bearing seat is the same as that of the first test bearing, thus compensating for the difference in outer diameter between the first and second test bearings. Additionally, the first test... Before testing, the surface of the bearing needs to be coated with grease. During the test, the first test bearing is positioned by the cover and the first bearing seat to perform the grease test. The outer side of the second test bearing is equipped with a test oil box. The test oil box can not only cooperate with the second test bearing to position it, but also continuously drip lubricating oil onto the second test bearing during the test, thus enabling the lubricating oil test. Therefore, this invention can perform grease effective life test by installing a grease test assembly, and can perform lubricating oil effective life test by removing the grease test assembly and installing the lubricating oil test assembly, achieving two uses in one machine, improving the utilization rate of the test head, and greatly reducing the test cost.

[0021] 2. The testing head of this invention is equipped with two first bearing seats, which can accommodate two first test bearings or two second test bearings, effectively replacing the auxiliary bearings of existing testing machines with test bearings. Taking the first test bearings as an example, the inner rings of both first test bearings are fixed to the positioning shaft, and their outer rings abut against the two first bearing seats respectively. During testing, the preload device pushes one of the first bearing seats through a disc spring to provide an axial load to the outer ring of one first test bearing. The inner ring of this first test bearing will cause the positioning shaft to move slightly axially. The other first test bearing moves slightly axially with the positioning shaft to push against its corresponding first bearing seat. The axial load it receives is the same as that of the previous first test bearing, thus the force on one first test bearing can be transmitted to the other through the positioning shaft. According to Newton's third law, the two first test bearings experience the same axial load and can simultaneously drive the positioning shaft to rotate via a drive motor. Since both first test bearings are mounted on the positioning shaft via a first transition sleeve, the rotation of the first positioning shaft provides circumferential torque to both first test bearings. The second test bearing operates similarly. Therefore, this invention provides a test head with two test bearings, and all test conditions for the two test bearings are identical, allowing for simultaneous testing. This results in a higher failure probability and easier test results compared to existing test heads that rely on only one test bearing, thus improving the efficiency of obtaining test results. Furthermore, this invention eliminates the need for auxiliary bearings, oil box structures, and oil seal structures, preventing oil leakage and contamination of the test head. Attached Figure Description

[0022] Figure 1 This is a half-sectional schematic diagram of an existing testing machine;

[0023] Figure 2 This is a cross-sectional view of the test head for testing grease according to the present invention;

[0024] Figure 3 This is a top view of the overall structure of the present invention;

[0025] Figure 4 This is a cross-sectional view of the front end of the test head for testing grease according to the present invention;

[0026] Figure 5 A half-sectional schematic diagram of the front end of the test head for lubricating oil testing according to the present invention;

[0027] Figure 6 This is a partial sectional view of the test oil box at the front end of the test head of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the second transition sleeve of the present invention;

[0029] Figure 8This is a schematic diagram of the structure of the puller and the second transition sleeve of the present invention.

[0030] Label Explanation:

[0031] 1. Test head; 11. Positioning shaft; 12. First bearing housing; 121. Oil drain port; 13. Preload device; 131. Worm gear; 132. Worm; 133. Nut sleeve; 134. Bushing; 135. Motor; 136. Roller; 137. Thrust ball bearing; 14. Disc spring; 141. Second gasket; 142. Third gasket; 143. Third heat insulation sleeve; 15. Resistance heater; 16. Platinum resistance thermometer; 17. Vibration sensor; 18. Pressure sensor; 19. Sealing ring; 2. Drive motor; 3. Grease test assembly; 31. First test bearing; 32. First gasket; 33. First transition sleeve; 331. The first... 34. Protruding edge; 4. Cover; 4. Lubricating oil test assembly; 41. Second test bearing; 42. Second bearing seat; 43. Second transition sleeve; 431. Second protruding edge; 432. Notch; 433. Annular groove; 44. Test oil box; 441. Oil inlet channel; 442. Oil outlet channel; 45. Oil seal; 46. Positive electrode; 47. Negative electrode; 6. Puller; 61. Claw; 7. Base; 71. Machine head base plate; 72. Motor base plate; 721. Rotation center; 73. Double-sided positioner; 8. Outer shell; 81. Housing; 811. Long groove; 82. Front cover; 83. Rear cover; 84. First heat insulation sleeve; 85. Second heat insulation sleeve; 9. Support. Detailed Implementation

[0032] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1-8 As shown, the present invention provides a dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicles (hereinafter referred to as the testing machine), including a testing head 1 and a drive motor 2. The testing head 1 includes a positioning shaft 11, a grease testing component 3, a lubricating oil testing component 4, two first bearing seats 12, a preload device 13, and a disc spring 14. The drive motor 2 drives the positioning shaft 11 to rotate circumferentially. The two first bearing seats 12 are symmetrically sleeved on both ends of the positioning shaft 11. The preload device 13 and the disc spring 14 are arranged on one side of one of the first bearing seats 12. The two ends of the disc spring 14 are axially abutting against the preload device 13 and the first bearing seat 12, respectively.

[0034] Key references Figure 2 and Figure 4The grease testing assembly 3 has two sets, symmetrically arranged. Each set includes a first test bearing 31, a first gasket 32, a first transition sleeve 33, and a cover 34. When testing the effective life of the bearing grease, grease is applied to the surface of the first test bearing 31, and the first gasket 32 ​​is fitted and fixed onto the first transition sleeve 33. The two first transition sleeves 33 are respectively fitted onto the two ends of the positioning shaft 11, and the first test bearing 31 and the first gasket 32 ​​are located between the first transition sleeve 33 and the first bearing seat 12. The outer ring of the first test bearing 31 abuts against the inner circumference of the first bearing seat 12. Specifically, a boss can be provided on the inner circumference of the first bearing seat 12 to abut against the first test bearing 31. The cover 34 covers the outside of the first test bearing 31 and abuts against the first test bearing 31, thereby the cover 34 and the first bearing seat 12 are connected. 2. The first test bearing 31 is positioned by abutting against the inner and outer sides of the first test bearing 31, and the first bearing housing 12 is isolated from the outside. At this time, the equipment is started, and the preload device 13 provides axial load to the outer ring of the first test bearing 31 by pushing one of the first bearing housings 12 through the disc spring 14. The inner ring of the first test bearing 31 will drive the positioning shaft 11 to move slightly axially, thereby causing the other first test bearing 31 to move slightly axially and push against the other first bearing housing 12. The two first test bearings 31 are subjected to the same axial load. In addition, the drive motor 2 drives the positioning shaft 11 to rotate, which can simultaneously provide circumferential torque to the two first test bearings 31, thereby conducting the bearing grease effective life test. Moreover, the test head 1 has two first test bearings 31 tested at the same time, which makes it easier to obtain test results, thereby improving the efficiency of obtaining test results.

[0035] Key references Figure 5The lubricating oil test assembly 4 is provided in two sets, symmetrically arranged. Each set includes a second test bearing 41, a second bearing housing 42, a second transition sleeve 43, and a test oil box 44. The second bearing housing 42 is fitted onto the second transition sleeve 43. The second test bearing 41 is positioned between the second transition sleeve 43 and the second test bearing 41, with the outer ring of the second test bearing 41 abutting against the inner circumference of the second bearing housing 42. The size of the first test bearing 31 is generally larger than the outer diameter of the second test bearing 41. When the second transition sleeve 43 is fitted onto the positioning shaft 11, the second bearing... The seat 42 abuts against the inner circumference of the first bearing seat 12, specifically against the boss provided on the inner circumference of the first bearing seat 12. Thus, the outer diameter of the second bearing seat 42 is the same as that of the first test bearing 31, which can compensate for the outer diameter of the second test bearing 41. The second test bearing 41 can also be installed between the positioning shaft 11 and the first bearing seat 12 for testing. Then, the test oil box 44 is placed on the outside of the second test bearing 41 and abuts against the second test bearing 41 to position the second test bearing 41. The test oil box 44 can continuously drip lubricating oil onto the second test bearing 41. The test can be carried out by starting the equipment. The working principle is the same as the test for testing the life of lubricating grease.

[0036] Key references Figure 2 and Figure 4 To test the effective life of the lubricating oil and grease in the test bearing, the test bearing needs to be heated and kept warm. Therefore, thermocouples and resistance heaters 15 for heating and keeping warm the first test bearing 31 or the second test bearing 41 are set on both first bearing seats 12. The outer periphery of the first bearing seat 12 is provided with a mounting groove, and the thermocouples and resistance heaters 15 are set in the mounting groove. The temperature can be set to 120℃~220℃ through the thermocouples and resistance heaters 15 (the temperature setting should be a multiple of 10℃). As a preferred embodiment, a platinum resistance thermometer 16 can also be set on the first bearing seat 12 to measure the temperature, thereby monitoring the temperature and automatically recording the temperature change curve.

[0037] Key references Figure 5 The test oil box 44 contains lubricating oil and has an oil inlet channel 441 and an oil outlet channel 442 connecting the second test bearing 41. The oil inlet channel 441 and the oil outlet channel 442 are connected to continuously drip lubricating oil onto the second test bearing 41, thus enabling the bearing lubricating oil effective life test. A sealing oil seal 45 is provided between the second bearing housing 42 and the second transition sleeve 43, and also between the second bearing housing 42, the test oil box 44, and the first bearing housing 12, to prevent lubricating oil leakage. Furthermore, an oil drain port 121 can be provided on the first bearing housing 12, and an oil receiving tray (not shown in the figure) can be provided below the oil drain port 121. When there is lubricating oil in the oil receiving tray, it indicates that the oil seal 45 has failed and needs to be repaired.

[0038] like Figure 6 As shown, two electrodes, namely positive electrode 46 and negative electrode 47, can be set on the test oil box 44 to test the effect of voltage load on the performance of lubricating oil. In addition, a vibration sensor 17 (not shown in the figure) can be set near the test oil box 44 or the cover 34 so that when the first test bearing 31 or the second test bearing 41 fails and vibrates, an alarm can be triggered to stop the machine immediately and the test time can be recorded.

[0039] Key references Figure 4 and Figure 5 The inner outer periphery of the first transition sleeve 33 and the second transition sleeve 43 are respectively provided with a first protruding edge 331 and a second protruding edge 431. The first gasket 32 ​​is located between the first test bearing 31 and the first protruding edge 331. When disassembling the first test bearing 31, the cover 34 is removed first, and then the first transition sleeve 33 is pulled outward axially. During the process of pulling out the first transition sleeve 33, the first protruding edge 331 will abut against the first gasket 32, so that the first test bearing 31 and the first gasket 32 ​​will be removed together with the first transition sleeve 33, completing the disassembly of the grease test assembly 3. Similarly, the second protruding edge 431 will abut against the second test sleeve 43 during the process of pulling out the second transition sleeve 43. The test bearing 41 abuts against the second bearing housing 42, and a sealing oil seal 45 is provided between the second transition sleeve 43 and the test bearing 41. The two are thus interference-fitted. The second test bearing 41 and the second bearing housing 42 are also removed together with the second transition sleeve 43. During installation, the first test bearing 31 and the first gasket 32 ​​can be installed on the first transition sleeve 33 in advance, and then the first transition sleeve 33 can be installed on the positioning shaft 11. Finally, the cover 34 is installed to complete the installation of the grease test assembly 3. The lubricating oil test assembly 4 is installed in the same way. Therefore, with the setting of the first transition sleeve 33 and the second transition sleeve 43, the replacement of the grease test assembly 3 and the lubricating oil test assembly 4 is convenient and quick.

[0040] Key references Figure 7 and Figure 8 The first transition sleeve 33 and the second transition sleeve 43 can be removed by a puller 6. The puller 6 is provided with fixed claws 61. The outer ends of the first transition sleeve 33 and the second transition sleeve 43 are provided with notches 432 that cooperate with the claws 61. The first transition sleeve 33 and the second transition sleeve 43 are provided with an annular groove 433 communicating with the notches 432 on the inner side of the notches 432. First, the claws 61 are engaged with the notches 432, and then the puller 6 is pushed inward to make the claws 61 extend into the annular groove 433. Rotating the puller 6 can make the claws 61 and the notches 432 misaligned, and the claws 61 abut against the side wall of the annular groove 433. At this time, pulling the puller 6 outward can remove the first transition sleeve 33 or the second transition sleeve 43. The first transition sleeve 33 and the second transition sleeve 43 can be removed quickly and easily with the help of the puller 6.

[0041] In a preferred embodiment, sealing rings 19 are provided between the first transition sleeve 33 and the positioning shaft 11, and between the second transition sleeve 43 and the positioning shaft 11. The friction of the sealing rings 19 allows the first transition sleeve 33 or the second transition sleeve 43 to rotate with the positioning shaft 11. Disassembling the first transition sleeve 33 and the second transition sleeve 43 will not wear the positioning shaft 11. The first test bearing 31 and the second test bearing 41 can be interference-fitted with the first transition sleeve 33 and the second transition sleeve 43, respectively. Replacing the first test bearing 31 or the second test bearing 41 will wear the first transition sleeve 33 or the second transition sleeve 43, but will not wear the positioning shaft 11. Moreover, the cost of replacing the first transition sleeve 33 or the second transition sleeve 43 is lower than the cost of replacing the positioning shaft 11.

[0042] Key references Figure 3 The testing machine also includes a base 7, on which two testing heads 1 and two drive motors 2 are arranged radially side by side. The positioning shafts 11 of the two testing heads 1 are axially connected to the two drive motors 2 respectively. Setting up two testing heads 1 makes the machine more stable and easier to position. Specifically, the base 7 is provided with a head base plate 71 for mounting the testing heads 1. The head base plate 71 is provided with a rotation center 721 and rotates relative to the base 7. The rotation center 721 is preferably located in the middle of the motor base plate 71, with a small rotation range. The testing head 1 is fixed on the head base plate 71 and rotates with the head base plate 71. A double-sided locator 73 is provided between one end of the two head base plates 71. The machine also includes an axially sliding motor base plate 72 for mounting the drive motor 2. The drive motor 2 is fixed to the motor base plate 72 and moves axially with the motor base plate 72. After the axial movement of the drive motor 2 disconnects from the positioning shaft 11, the machine head 1 can be rotated to facilitate the replacement of the first test bearing 31 or the second test bearing 41 at one end of the positioning shaft 11. After the replacement is completed, the machine head 1 needs to be rotated back to its original position. It returns to its original position when the inner side of the machine head base plate 71 abuts against the double-sided locator 73, thus achieving precise positioning. Setting two machine heads 1 can stabilize the double-sided locator 73, and the use of one double-sided locator 73 for two machine heads 1 can also reduce costs.

[0043] Key references Figure 2 and Figure 4The test head 1 also includes a housing 8. The positioning shaft 11, the grease test assembly 3, the lubricating oil test assembly 4, the first bearing seat 12, the preload device 13, and the disc spring 14 are all disposed inside the housing 8. One end of the positioning shaft 11 extends out of the housing 8 and is connected to the drive motor 2. The housing 8 includes a shell 81 and a front cover 82 and a rear cover 83 located at the front and rear ends of the shell 81, respectively. The two sets of grease test assemblies 3 or lubricating oil test assemblies 4 are located inside the front cover 82 and the rear cover 83, respectively. The front cover 82 and the rear cover 83 are detachable, and the lubricating oil test assembly 4 or the grease test assembly 3 can be replaced after disassembly. Supports 9 are provided between the front end of the shell 81 and the front cover 82, and between the rear end of the shell 81 and the rear cover 83. The bottom end of the support 9 is fixed to the motor base plate 72 to support the entire test head 1. The support 9 also extends into the interior of the housing 8 and is connected to the outer periphery of the first bearing seat 12.

[0044] Key references Figure 2 The preload device 13 is specifically located between two first bearing seats 12. The preload device 13 includes a worm gear 131, a worm 132, a nut sleeve 133, a bushing 134, and a motor 135. The bushing 134 is slidably sleeved on the positioning shaft 11, and one end of the bushing 134 abuts against the disc spring 14. The outer circumference of the bushing 134 is provided with external threads, and the inner circumference of the nut sleeve 133 is provided with internal threads. The nut sleeve 133 is sleeved on the bushing 134 and threadedly connected to the bushing 134. The worm gear 131 is sleeved on the nut sleeve 133 and fixedly connected to the nut sleeve 133 by a key. The worm 132 and the worm gear... 131 meshes, the motor 135 drives the worm gear 132 to rotate, the worm gear 132 drives the worm wheel 131 and the nut sleeve 133 to rotate. Since the nut sleeve 133 and the bushing 134 are threadedly connected, the rotation of the nut sleeve 133 can drive the bushing 134 to move axially. Thus, the bushing 134 pushes against the first bearing seat 12 at the front end of the positioning shaft 11 through the disc spring 14. The first bearing seat 12 is connected to the support 9 by a key and can move slightly. The other first bearing seat 12 is fixed to the support 9, thereby providing axial load for the two first test bearings 31 or the second test bearing 41.

[0045] In a preferred embodiment, a pressure sensor 18 can be installed between one end of the bushing 134 and the disc spring 14. The pressure sensor is connected to the motor 135. The pressure sensor 18 can detect the magnitude of the axial load supplied by the preload device 13. If the load is less than the set value required for the test, it will send a signal to the motor 135, which will start and drive the worm gear 132 and worm wheel 131 to start. This causes the bushing 134 to move axially and compress the disc spring 14 to increase the axial load. When the axial load reaches the set value, the motor 135 stops working. If the measured load is greater than the set value, the motor 135 will start and drive the bushing 134 to move axially in the opposite direction to reduce the axial load, thereby stabilizing the axial load within the set value and realizing automatic compensation of the axial load. The pressure sensor 18 can be connected to a display screen (not shown in the figure) to display the load changes on the screen for easy monitoring by the staff.

[0046] The housing 81 has a long groove 811 along the axial direction. One end of the bushing 134 has a roller 136 extending radially. The roller 136 is axially slidably disposed in the long groove 811. The roller 136 can only slide axially in the long groove 811, which can limit the range of movement of the bushing 134.

[0047] A first heat insulation sleeve 84 is fixed between the rear end of the housing 81 and the support 9. The first heat insulation sleeve 84 can insulate heat to maintain the test temperature. A thrust ball bearing 137 abuts between the nut sleeve 133 and the first heat insulation sleeve 84. The thrust ball bearing 137 can convert planar friction into rolling friction, thereby reducing circumferential resistance.

[0048] Key references Figure 2 A second washer 141 is provided between one end of the disc spring 14 and the first bearing seat 12. A second heat insulation sleeve 85 is provided between the second washer 141 and the first bearing seat 12. The second heat insulation sleeve 85 also has the function of heat insulation and heat preservation. The second washer 141 can protect the second heat insulation sleeve 85 from being squeezed and worn. A third washer 142 is provided between the other end of the disc spring 14 and the pressure sensor 18. The third washer 142 can protect the pressure sensor 18 from being squeezed and worn. Both the second washer 141 and the third washer 142 have been heat treated and are made of hard material, which can bear the axial load of the disc spring 14 and has good heat resistance.

[0049] A third heat insulation sleeve 143 is fixed between the housing 81 and the support 9. The third heat insulation sleeve 143 has the same function as the first heat insulation sleeve 84. The third heat insulation sleeve 143 at the front end of the housing 81 can be connected to the first bearing seat 12 by a key. A distance is left between the second gasket 141 and the third heat insulation sleeve 143 for the second gasket 141 to move.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the design of this case. All equivalent changes made based on the key design features of this case shall fall within the protection scope of this case.

Claims

1. A dual-purpose testing machine for determining the effective life of bearing lubricating oils and greases used in new energy vehicles, characterized in that: The test head includes a test head and a drive motor. The test head includes a positioning shaft, a grease test assembly, a lubricating oil test assembly, two first bearing seats, a preload device, and a disc spring. The drive motor drives and connects to the positioning shaft. The two first bearing seats are respectively sleeved on both ends of the positioning shaft. The preload device and the disc spring are arranged on one side of one of the first bearing seats. The two ends of the disc spring are respectively axially abutting against the preload device and the first bearing seat. The grease testing assembly is provided in two sets. Each set of the grease testing assembly includes a first test bearing, a first gasket, a first transition sleeve, and a cover. The first test bearing and the first gasket are fitted on the first transition sleeve. When testing the effective life of the bearing grease, the two first transition sleeves are respectively fitted on both ends of the positioning shaft, and the first test bearing and the first gasket are located between the first transition sleeve and the first bearing seat. The outer ring of the first test bearing abuts against the inner circumference of the first bearing seat. The cover is placed on the outside of the first test bearing and abuts against the first test bearing. The lubricating oil test assembly is provided in two sets. Each set of the lubricating oil test assembly includes a second test bearing, a second bearing housing, a second transition sleeve, and a test oil box. The second bearing housing is fitted onto the second transition sleeve. The second test bearing is located between the second transition sleeve and the second test bearing, and the outer ring of the second test bearing abuts against the inner circumference of the second bearing housing. When testing the effective life of the bearing lubricating oil, the two second transition sleeves are respectively fitted onto the two ends of the positioning shaft. The second bearing housing abuts against the inner circumference of the first bearing housing. The test oil box is located on the outside of the second test bearing and abuts against the second test bearing.

2. The dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicles as described in claim 1, characterized in that: The inner ends of the first transition sleeve and the second transition sleeve are respectively provided with a first protruding edge and a second protruding edge. The first gasket is located between the first test bearing and the first protruding edge. The first protruding edge abuts against the first gasket during the process of pulling out the first transition sleeve, and the second protruding edge abuts against the second test bearing during the process of pulling out the second transition sleeve.

3. The dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicles as described in claim 2, characterized in that: The first transition sleeve and the second transition sleeve are removed by a puller. The puller is equipped with fixed claws. The outer ends of the first transition sleeve and the second transition sleeve are provided with notches that cooperate with the claws. The first transition sleeve and the second transition sleeve are provided with an annular groove communicating with the notch on the inner side of the notch. The claws extend into the annular groove through the notch. The puller rotates to make the claws displace the notch and abut against the side wall of the annular groove to pull out the first transition sleeve or the second transition sleeve.

4. The dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicles as described in claim 1, characterized in that: The test oil box contains lubricating oil and has an oil inlet channel and an oil outlet channel connecting to the second test bearing. The oil inlet channel and the oil outlet channel are connected to continuously drip lubricating oil onto the second test bearing. A sealing oil seal is provided between the second bearing housing and the second transition sleeve, and an oil seal is also provided between the second bearing housing and the test oil box and the first bearing housing.

5. The dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicles as described in claim 1, characterized in that: A sealing ring is provided between the first transition sleeve and the positioning shaft, and between the second transition sleeve and the positioning shaft.

6. The dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicles as described in claim 1, characterized in that: It also includes a base, on which two test heads and two drive motors are arranged radially side by side, and the positioning shafts of the two test heads are axially connected to the two drive motors respectively.

7. The dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicles as described in claim 6, characterized in that: The base is provided with a head plate for mounting the test head. The head plate has a rotation center on the base and rotates relative to the base. A double-sided locator is provided between one end of the two head plates. The base is also provided with an axially sliding motor base plate for mounting the drive motor.

8. The dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicles as described in claim 7, characterized in that: The test head also includes a housing. The positioning shaft, grease test assembly, lubricating oil test assembly, first bearing seat, preload device, and disc spring are all housed inside the housing. One end of the positioning shaft extends out of the housing and is connected to the drive motor. The housing includes a shell and a front cover and a rear cover located at the front and rear ends of the shell, respectively. Supports are provided between the front end of the shell and the front cover, and between the rear end of the shell and the rear cover. The bottom of the support is connected to the base plate of the test head. The support is connected to the outer periphery of the first bearing seat, and the two first bearing seats are symmetrically arranged.

9. The dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicles as described in claim 1, characterized in that: The preload device includes a worm gear, a worm, a nut sleeve, a bushing, and a motor. The bushing is slidably mounted on the positioning shaft, with one end abutting against a disc spring. The nut sleeve is mounted on the bushing and threadedly connected to it. The worm gear is mounted on the nut sleeve and fixedly connected to it via a key. The worm meshes with the worm gear. The motor drives the worm to rotate, which in turn drives the worm gear and the nut sleeve to rotate, thereby driving the bushing to move axially and push against the first bearing seat to provide axial load.

10. A dual-purpose testing machine for determining the effective life of bearing lubricating oil and grease for new energy vehicles as described in claim 9, characterized in that: A pressure sensor is provided between one end of the bushing and the disc spring, and the pressure sensor is connected to the motor signal.

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