Oil seal testing device for driving motor and assembly and testing method

Abstract

The present invention relates to the field of seal testing, and in particular to an oil seal testing device for a drive motor and an assembly and testing method, comprising an oil seal testing workpiece, a drive motor connected to the oil seal testing workpiece, and a test bench fixedly connected to the drive motor; the oil seal testing workpiece comprises a workpiece base, the workpiece base is provided with a first accommodating cavity, the first accommodating cavity is fixedly connected to a test shaft through a bearing, and the workpiece base is also provided with a second accommodating cavity for placing an oil seal to be tested that matches the test shaft. The oil seal testing device provided by the present invention accurately converts the test of the oil seal by the drive motor in the prior art into the test of the oil seal by the oil seal testing workpiece, and has a simple design, light weight, and simple operation, which can reduce the difficulty of replacing core expensive test parts and avoid multiple disassembly and installation of the drive motor and the test bench. Especially when the number of oil seal samples is large, it can greatly improve the work efficiency of the test and reduce the cost of the test.

Description

Technical Field

[0001] The invention relates to the field of seal testing, and in particular to an oil seal testing device for a drive motor and an assembly and testing method. Background Art

[0002] At present, my country is insisting on promoting the positive development of electric vehicles, and the energy-saving and environmental protection wave of electric vehicles has become unstoppable. As one of the core "three-electric systems" of electric vehicles, the drive motor is developing towards high power density, higher efficiency, higher speed, higher reliability and lower cost. The higher speed motor poses higher challenges to the motor's oil seal. The oil seal of the drive motor is installed between the output rotor shaft and the end cover of the motor, and is closely matched with the rotor shaft and the end cover to prevent water, mud and other debris from the outside of the motor from entering the motor, and must meet the IP67 sealing effect. However, due to the rotation of the motor, the rotor shaft of the motor and the lip of the oil seal will inevitably rub and generate heat. The amount of heat is related to factors such as motor speed, motor running time, rotor shaft roughness, oil seal lip size, whether there is lubricating oil between the oil seal and the rotor shaft, and concentricity. Therefore, in the early stage of developing and designing the drive motor, it is necessary to fully test and verify the feasibility of the oil seal.

[0003] In the prior art, the oil seal test and verification basically adopts the method of installing the oil seal on the rotor shaft of the drive motor and then installing the drive motor on the test bench. During the test, the motor can be operated according to different speed conditions, and the real-time temperature of the oil seal can be recorded to observe whether the oil seal is abnormal. After the operation is completed, it is necessary to test the air tightness of the whole motor and judge whether the oil seal after the test can still meet the IP67 sealing effect based on the leakage amount.

[0004] The defects of the above-mentioned prior art are as follows: on the one hand, the test bench needs to be installed and disassembled with a drive motor of a certain weight before and after the test, which increases the workload of building the test bench and makes the test efficiency low; on the other hand, in the oil seal test, the oil seal lip is prone to cause friction damage to the surface of the rotor shaft, resulting in the motor rotor shaft after the test cannot be reused and the rotor shaft needs to be replaced, which not only increases the workload of replacing the rotor shaft, but may also cause damage to core components such as the rotor core and bearings during the replacement process, thereby increasing the testing cost. Summary of the invention

[0005] In order to solve the technical problem of low efficiency of oil seal testing in the above-mentioned prior art, the present invention provides an oil seal testing device for a drive motor, comprising an oil seal testing workpiece, a drive motor connected to the oil seal testing workpiece, and a test stand fixedly connected to the drive motor; the oil seal testing workpiece comprises a workpiece base, the workpiece base is provided with a first accommodating cavity, the first accommodating cavity is fixedly connected to a test shaft via a bearing, and the workpiece base is also provided with a second accommodating cavity for placing the oil seal to be tested that cooperates with the test shaft.

[0006] On the basis of the above technical solution, further, the test shaft is also sequentially sleeved with a bearing retaining ring and a retaining spring that abut against the outer ring of the bearing.

[0007] On the basis of the above technical solution, further, the end of the test shaft is an external spline, the end of the rotor shaft of the drive motor is provided with an internal spline matching the external spline, and the test shaft and the drive motor are detachably connected through the internal and external splines.

[0008] On the basis of the above technical solution, further, the workpiece base is fixedly connected to the front end cover of the driving motor through a plurality of bolts.

[0009] On the basis of the above technical solution, further, a base stop is provided at one end of the workpiece base connected to the drive motor, and the base stop is engaged with the front end cover stop.

[0010] On the basis of the above technical solution, further, the workpiece base is provided with a plurality of reinforcing ribs.

[0011] On the basis of the above technical solution, further, it also includes an airtight component installed on the oil seal test workpiece when testing the airtightness of the oil seal.

[0012] On the basis of the above technical solution, further, the airtight component includes a workpiece cover plate sealed with the workpiece base, an inflation joint is arranged on the workpiece cover plate, and the inflation joint is externally connected to an airtight tester through an inflation pipe.

[0013] The present invention also provides an assembly method of the drive motor oil seal testing device as described above, comprising the following steps:

[0014] S10, the bearing is installed on the test shaft by the shrink fitting process;

[0015] S20, after the bearing has cooled down, insert the test shaft and the bearing into the tooling base;

[0016] S30, sequentially install the bearing retaining ring and the retaining ring on the test shaft;

[0017] S40, insert the installed oil seal test workpiece into the oil seal to be tested, connect it with the airtight component to test the airtightness of the oil seal; connect it with the drive motor to test various performances of the oil seal under actual working conditions.

[0018] The present invention also provides a testing method using the drive motor oil seal testing device as described above, which also includes the following testing steps:

[0019] S100, after installing the oil seal to be tested into the oil seal test workpiece, install the airtight component, test it according to the airtight test conditions through an external airtight tester, and read the final leakage amount to test the airtightness of the oil seal;

[0020] S200, after disassembling the airtight component, install the oil seal test workpiece on the drive motor of the test bench, control the speed of the drive motor under different working conditions through the controller, and record the measured real-time temperature of the oil seal through the temperature sensor to observe whether the oil seal is abnormal;

[0021] S300, remove the tested oil seal test workpiece from the drive motor of the test bench, reinstall the airtight component, and test whether the airtightness of the oil seal meets the standard through an external airtightness tester again.

[0022] Compared with the prior art, the oil seal testing device provided by the present invention has the following advantages: the test of the oil seal by the driving motor in the prior art is accurately converted into the test of the oil seal by the oil seal testing workpiece, and the design is simple, the weight is light, and the operation is easy, which greatly reduces the difficulty of replacing the core valuable test parts, avoids multiple disassembly and installation actions of the driving motor and the test bench, and reduces the workload. Especially for a large number of oil seal samples, the test efficiency can be greatly improved and the test cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A three-dimensional diagram of a drive motor oil seal testing device provided by the present invention;

[0025] Figure 2 It is a cross-sectional view of the oil seal test workpiece;

[0026] Figure 3 It is a cross-sectional view of the connection between the oil seal test workpiece and the drive motor;

[0027] Figure 4 It is a top view of the workpiece base;

[0028] Figure 5 for Figure 4 Sectional view of AA in the middle;

[0029] Figure 6 A three-dimensional diagram showing the connection between the workpiece base and the airtight component;

[0030] Figure 7 It is a cross-sectional view of the connection between the workpiece base and the airtight component;

[0031] Figure 8 This is a flow chart of the drive motor oil seal testing device provided by the present invention.

[0032] Reference numerals:

[0033] 100 oil seal test workpiece 200 drive motor 300 test bench

[0034] 110 workpiece base 111 first accommodating cavity 120 bearing

[0035] 130 test shaft 112 second accommodating chamber 400 oil seal to be tested

[0036] 140 bearing retaining ring 150 retaining ring 113 base stop

[0037] 114 reinforcement rib 500 airtight component 510 workpiece cover

[0038] 520 inflation connector 115 spring mounting position 116 third accommodation chamber DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0041] The present invention provides an oil seal testing device for a drive motor, comprising an oil seal testing workpiece 100, a drive motor 200 connected to the oil seal testing workpiece 100, and a stand 300 fixedly connected to the drive motor 200; the oil seal testing workpiece 100 comprises a workpiece base 110, the workpiece base 110 is provided with a first accommodating cavity 111, the first accommodating cavity 111 is fixedly connected to a test shaft 130 via a bearing 120, and the workpiece base 110 is also provided with a second accommodating cavity 112 for placing an oil seal 400 to be tested that cooperates with the test shaft 130.

[0042] When implementing it, Figures 1 to 5 As shown, the oil seal test device includes an oil seal test workpiece 100, a drive motor 200, and a stand 300, wherein the drive motor 200 and the stand 300 are fixedly connected by a number of evenly distributed bolts, and a through hole is also provided at the bottom of the stand 300 for connection with a desktop or other racks. The oil seal test workpiece 100 includes a workpiece base 110, and a first accommodating cavity 111 is provided in the workpiece base 110 for mounting a bearing 120 and a test shaft 130 passing through the bearing 120. Preferably, the bearing 120 is two deep groove ball bearings, and the two deep groove ball bearings are separated by the shaft shoulder of the test shaft 130. The workpiece base 110 is also provided with a second accommodating chamber 112 which is coaxial with and communicates with the first accommodating chamber 111. The second accommodating chamber 112 is used to place the oil seal 400 to be tested which is sleeved on the test shaft 130. As a preferred solution, the size tolerance of the second accommodating chamber 112 is consistent with the size tolerance of the oil seal position of the front end cover of the drive motor 200 for placing the oil seal; similarly, the shaft section of the test shaft 130 for sleeved the oil seal 400 to be tested is consistent with the size tolerance of the shaft section in the rotor shaft of the drive motor 200 for sleeved the oil seal; through the above-mentioned inventive concept, it can ensure that the oil seal test environment of the test workpiece 100 is consistent with the oil seal working environment of the drive motor 200, so that it is more in line with the actual working conditions, thereby ensuring the reliability and accuracy of the test results.

[0043] The oil seal testing device provided by the present invention accurately converts the test of the oil seal by the drive motor in the prior art into the test of the oil seal by the oil seal test workpiece. It is simple in design, light in weight, and easy to operate, which greatly reduces the difficulty of replacing core valuable test parts, avoids multiple disassembly and installation actions of the drive motor and the test bench, and reduces the workload. Especially when the number of oil seal samples is large, it can greatly improve the test efficiency and reduce the test cost.

[0044] Preferably, the test shaft 130 is also sequentially sleeved with a bearing retaining ring 140 and a retaining ring 150 which abut against the outer ring of the bearing 120 .

[0045] When implementing it, Figure 2 , 5 As shown, the workpiece base 110 is provided with a first accommodating cavity 111, one end of the first accommodating cavity 111 is connected with the second accommodating cavity 112, and the other end is connected with the retaining spring installation position 115. The test shaft 130 is sequentially sleeved with a bearing retaining ring 140 and a retaining spring 150 that abut against the outer ring of the bearing 120 on one side of the retaining spring installation position 115. Since the retaining spring installation position 115 is at a certain distance from the bearing 120, the function of the bearing retaining ring 140 is to prevent the retaining spring 150 from interfering with the test shaft 130 when it is installed. The function of the retaining spring 150 is to fix the outer ring of the bearing 120, so as to limit the axial movement of the test shaft 130 during operation.

[0046] Preferably, the end of the test shaft 130 is an external spline, and the end of the rotor shaft of the drive motor 200 is provided with an internal spline that matches the external spline, and the test shaft 130 and the drive motor 200 are detachably connected via the internal and external splines.

[0047] When implementing it, Figure 3 , 5 As shown, the tooling base 110 is also provided with a third accommodating chamber 116, and the third accommodating chamber 116 is used to accommodate the test shaft 130 and the shaft of the drive motor 200. The end of the test shaft 130 is an external spline, and the structural surface of the external spline can be an involute-shaped structure or a rectangular structure. The rotor shaft end of the drive motor 200 is provided with an internal spline that cooperates with the external spline. The test shaft 130 and the drive motor 200 are detachably connected through the internal and external splines to transmit torque, and the synchronous rotation of the test shaft 130 and the rotor shaft is accurately achieved, so that the test operating conditions of the test shaft 130 are consistent with the operating conditions of the rotor shaft of the drive motor 200, thereby more accurately converting the test of the oil seal of the drive motor 200 into the test of the oil seal test workpiece on the oil seal 400 to be tested, which can reduce the difficulty and workload of replacing core test components (such as oil seals and rotor shafts) and reduce the waste of precious core materials of the drive motor, and further ensure the reliability and accuracy of the test results.

[0048] Preferably, the workpiece base 110 is fixedly connected to the front end cover of the driving motor 200 by a plurality of bolts.

[0049] When implementing it, Figure 3 As shown, a boss is provided at one end of the workpiece base 110 for opening a plurality of evenly distributed through holes, and a threaded hole matching the through hole is provided at the front end cover of the drive motor 200, and bolts are matched through the through hole and the threaded hole to fix the workpiece base 110 and the drive motor 200 together.

[0050] Preferably, a base stop 113 is provided at one end of the workpiece base 110 connected to the drive motor 200 , and the base stop 113 is engaged with the front end cover stop.

[0051] When implementing it, Figure 3 , 5 As shown, in order to further ensure that the axis center of the test shaft 130 of the oil seal test workpiece 100 and the axis center of the rotor shaft of the drive motor 200 are offset to a smaller extent, a base stop 113 is provided at one end of the workpiece base 110 connected to the drive motor 200, and the base stop 113 and the front end cover stop are fitted with a certain precision tolerance, thereby further improving the coaxial accuracy of the test shaft and the rotor shaft.

[0052] Preferably, the workpiece base 110 is provided with a plurality of reinforcing ribs 114 .

[0053] When implementing it, Figure 5 As shown, a plurality of reinforcing ribs 114 are provided at the position of the workpiece base 110 connected to the driving motor 200 , so as to strengthen the strength of the workpiece base 110 .

[0054] Preferably, it further includes an airtight component 500 mounted on the oil seal test workpiece 100 when testing the airtightness of the oil seal.

[0055] In specific implementation, in addition to testing its operating status, the oil seal also needs to be tested to see if it meets the IP67 sealing effect. The prior art is to perform an airtight test on the entire drive motor to determine whether the oil seal meets the requirements. The defect is that there are many variables, and it cannot be determined that the oil seal is the only leaking location. It is also possible that other parts of the drive motor have airtight leaks. In addition, the drive motor is heavier and more complex, and the operation is more cumbersome and inconvenient. Therefore, the solution designed by the present invention is to install an airtight component 500 on the oil seal test workpiece 100 to form a sealed space, and then perform an airtight test. The structure is simple and compact, and the installation and operation are convenient. It overcomes the problem of inaccurate airtight testing in the prior art, and makes it have fewer variables or even a single variable, which can more effectively test the airtight effect of the oil seal.

[0056] Preferably, the airtight component 500 includes a workpiece cover plate 510 sealed with the workpiece base 110 , and an air-filling joint 520 is provided on the workpiece cover plate 510 . The air-filling joint 520 is externally connected to an airtight tester through an air-filling pipe.

[0057] When implementing it, Figure 6 , 7 As shown, the airtight component 500 includes a workpiece cover plate 510 that is sealed to the workpiece base 110. The workpiece base 110 and the workpiece cover plate 510 can be sealed to form a closed space by means of a sealing element and / or a sealant and a plurality of bolts. An air-filling joint 520 is provided on the workpiece cover plate 510. The air-filling joint 520 has a seal and can be locked on the workpiece cover plate 510 by a threaded connection. The air-filling joint 520 is also externally connected to an air-tightness tester through an air-filling pipe. The working principle is that the air-tightness tester fills the oil seal test workpiece with gas through the air-filling pipe and the air-filling joint 520, and then performs the test according to the air-tightness test conditions, and reads the final leakage amount, so as to determine whether the air-tightness of the oil seal 400 to be tested meets the requirements.

[0058] The present invention also provides an assembly method for the drive motor oil seal test device as described above, comprising the following steps: S10, the bearing is installed on the test shaft by a shrink fitting process; S20, after the bearing is cooled, the test shaft and the bearing are inserted into a tooling base together; S30, the bearing retaining ring and the retaining spring are installed on the test shaft in sequence; S40, the installed oil seal test workpiece is inserted into the oil seal to be tested, and connected to the airtight component to test the airtightness of the oil seal; and connected to the drive motor to test the various performances of the oil seal under actual working conditions.

[0059] The present invention also provides a testing method using the drive motor oil seal testing device as described above, comprising the following testing steps: S100, after installing the oil seal to be tested into the oil seal testing workpiece, install the airtight component, use an external airtight tester to test according to the airtight test conditions, and read the final leakage volume to test the airtightness of the oil seal; S200, after disassembling the airtight component, install the oil seal testing workpiece on the drive motor of the test bench, control the speed of the drive motor under different working conditions through a controller, and record the measured real-time temperature of the oil seal through a temperature sensor to observe whether the oil seal has any abnormality; S300, disassemble the tested oil seal testing workpiece from the drive motor of the test bench, reinstall the airtight component, and use the external airtight tester again to test whether the airtightness of the oil seal meets the standard.

[0060] When implementing it, Figure 8As shown, the test method of the drive motor oil seal test device as described above includes the following steps: S100, after the oil seal to be tested is installed into the oil seal test workpiece, the airtight component is installed, and the test is performed according to the airtight test conditions through an external airtight tester, and the final leakage is read to test whether the airtightness of the oil seal meets the requirements before the actual working condition test; S200, when performing the actual working condition test, the airtight component is disassembled, and the oil seal test workpiece is installed on the drive motor of the bench. The drive motor is also externally connected to a controller, and the speed change of the drive motor under different working conditions is controlled by controlling the output voltage change, and the measured real-time temperature of the oil seal is recorded by a temperature sensor attached to the oil seal to observe whether the oil seal is abnormal; its control method is achievable by those skilled in the art according to the prior art, and will not be elaborated here. Through the above method, the actual working condition environment can be simulated for the oil seal and a feasibility test can be performed in the initial sample stage of the drive motor development and design, which can greatly improve the reliability of the oil seal. S300, finally, the oil seal test workpiece after the test is removed from the driving motor of the test bench, and the airtight component is reinstalled, and the airtightness of the oil seal after the simulated working condition environment test is tested again by an external airtight tester to test whether the airtightness of the oil seal meets the standard. As a preferred solution, the oil seal test device is also externally connected to a display for displaying and storing the motor speed, oil seal temperature value, motor cycle number, etc.

[0061] Although the terms such as oil seal test workpiece, drive motor, stand, workpiece base, first accommodating chamber, bearing, test shaft, second accommodating chamber, oil seal to be tested, bearing retaining ring, retaining spring, base stopper, reinforcing rib, airtight component, workpiece cover plate, inflatable joint, retaining spring installation position, third accommodating chamber, etc. are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil seal testing device for a drive motor, characterized in that: The invention comprises an oil seal test workpiece (100), a drive motor (200) connected to the oil seal test workpiece (100), and a stand (300) fixedly connected to the drive motor (200); the oil seal test workpiece (100) comprises a workpiece base (110), the workpiece base (110) is provided with a first accommodating cavity (111), the first accommodating cavity (111) is fixedly connected to a test shaft (130) via a bearing (120), and the workpiece base (110) is further provided with a second accommodating cavity (112) for accommodating an oil seal (400) to be tested that matches the test shaft (130); The test shaft (130) is also sleeved in sequence with a bearing retaining ring (140) and a retaining ring (150) that abut against the outer ring of the bearing (120); The end of the test shaft (130) is an external spline, the end of the rotor shaft of the drive motor (200) is provided with an internal spline that matches the external spline, and the test shaft (130) and the drive motor (200) are detachably connected via the internal and external splines. Also included is an airtight component (500) mounted on the oil seal test workpiece (100) when testing the airtightness of the oil seal; The airtight component (500) comprises a workpiece cover plate (510) sealed to a workpiece base (110), an air-filling joint (520) being provided on the workpiece cover plate (510), and the air-filling joint (520) being externally connected to an airtight tester via an air-filling pipe.

2. The oil seal testing device for a drive motor according to claim 1, characterized in that: The workpiece base (110) is fixedly connected to the front end cover of the drive motor (200) via a plurality of bolts.

3. The oil seal testing device for a drive motor according to claim 1, characterized in that: One end of the workpiece base (110) connected to the drive motor (200) is provided with a base stopper (113), and the base stopper (113) is engaged with the front end cover stopper.

4. The oil seal testing device for a drive motor according to claim 1, characterized in that: The workpiece base (110) is provided with a plurality of reinforcing ribs (114).

5. An assembly method of a drive motor oil seal testing device as claimed in claim 1, characterized in that: The following steps are involved: S10, the bearing is installed on the test shaft by the shrink fitting process; S20, after the bearing has cooled down, insert the test shaft and the bearing into the tooling base; S30, sequentially install the bearing retaining ring and the retaining ring on the test shaft; S40, inserting the installed oil seal test workpiece into the oil seal to be tested and connecting it to the airtight component to test the airtightness of the oil seal; Connected to the drive motor, it is used to test the performance of the oil seal under actual working conditions.

6. A testing method using the drive motor oil seal testing device according to any one of claims 1 to 4, characterized in that: The test steps include: S100, after installing the oil seal to be tested into the oil seal test workpiece, install the airtight component, test it according to the airtight test conditions through an external airtight tester, and read the final leakage amount to test the airtightness of the oil seal; S200, after disassembling the airtight component, install the oil seal test workpiece on the drive motor of the test bench, control the speed of the drive motor under different working conditions through the controller, and record the measured real-time temperature of the oil seal through the temperature sensor to observe whether the oil seal is abnormal; S300, remove the tested oil seal test workpiece from the drive motor of the test bench, reinstall the airtight component, and test whether the airtightness of the oil seal meets the standard through an external airtightness tester again.

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