Test System

Abstract

This application relates to the field of vehicle technology and discloses a testing system for testing the NVH performance of an electric drive assembly. The testing system includes a load motor, a first platform base, a second platform base, and functional components. The load motor is fixed to the first platform base and provides output torque. The first platform base, functional components, and second platform base are arranged sequentially. The functional components are connected to the first and second platform bases respectively and are configured to at least partially reduce longitudinal vibration transmitted from the first platform base to the second platform base, and to prevent lateral vibration transmitted from the first platform base to the second platform base. The testing system provided by this application reduces the interference of vibration on the test and ensures the accuracy of the test.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more specifically to a testing system. Background Technology

[0002] The electric drive system is a core component of new energy vehicles. However, the electric drive system generates noise during gear shifting due to electromagnetic force fluctuations and the meshing order characteristics of gear pairs. Therefore, after the prototype of the electric drive system is manufactured, its NVH (Noise, Vibration, Harshness) performance must be tested.

[0003] In related technologies, the NVH performance of the electric drive assembly is generally tested by using a load motor. However, during the test, the load motor and the electric drive assembly will vibrate, and the ground may resonate with the load motor and the electric drive assembly, which will cause certain interference to the test and thus affect the accuracy of the test. Summary of the Invention

[0004] In view of this, this application provides a testing system that reduces the interference of vibration on the test and ensures the accuracy of the test.

[0005] Specifically, the embodiments of this application include the following technical solutions:

[0006] This application provides a testing system for testing the NVH performance of an electric drive assembly. The testing system includes a load motor, a first platform base, a second platform base, and functional components.

[0007] The load motor is fixed to the first platform base and is used to provide output torque;

[0008] The first platform base, the functional component, and the second platform base are arranged sequentially. The functional component is connected to the first platform base and the second platform base respectively, and is configured to at least partially reduce the longitudinal vibration transmitted from the first platform base to the second platform base, and to prevent the first platform base from transmitting lateral vibration to the second platform base.

[0009] Optionally, the first platform base is located above the second platform base;

[0010] The functional components include a first support member and a moving member;

[0011] The first support member is connected to the first platform base and the second platform base at its opposite ends in the longitudinal direction, respectively;

[0012] The moving component is disposed at the connection between the first platform base and the first support member, for allowing the first platform base and the first support member to move relative to each other in the lateral direction and dissipate at least a portion of the energy of the lateral vibration; and / or, the moving component is disposed at the connection between the second platform base and the first support member, for allowing the second platform base and the first support member to move relative to each other in the lateral direction and dissipate at least a portion of the energy of the lateral vibration.

[0013] Optionally, the moving part includes a first moving unit, a second moving unit, and an energy-consuming unit;

[0014] The first motion unit is connected to either the first platform base or the second platform base;

[0015] The second motion unit is connected to the first motion unit, and the second motion unit can move laterally relative to the first motion unit;

[0016] The energy-consuming unit is connected to one of the first motion unit and the second motion unit, and is in damped sliding or damped rolling engagement with the other of the first motion unit and the second motion unit.

[0017] Optionally, the first motion unit and the second motion unit are respectively one of a track and a slider that can slide in the track;

[0018] The energy-consuming unit is a friction wheel, which is connected to the sliding member. The friction wheel is configured to roll in the track and provide frictional resistance that prevents the sliding member from sliding.

[0019] Optionally, the track extends laterally and has limit structures at both ends. The limit structures are used to restrict the range of movement of the friction wheel in the track to prevent the friction wheel from coming off the track.

[0020] Optionally, the functional component further includes at least one second support member, which is located between the first platform base and the second platform base and is connected to the first platform base and the second platform base respectively;

[0021] Each of the second support members is capable of elastic deformation in the longitudinal and / or transverse directions, wherein the second support member after elastic deformation in the transverse direction can dissipate at least a portion of the energy of the transverse vibration.

[0022] Optionally, a limiting member is provided on the surface of the first platform base facing the second platform base, and a limiting structure is provided on the surface of the second platform base facing the first platform base;

[0023] The first support member is a telescopic rod, which has an extended state and a retracted state. In the extended state, there is a gap between the first platform seat and the second platform seat, and the limiting member and the limiting structure are separated from each other. In the retracted state, the first platform seat is pressed against the second platform seat, and the limiting member and the limiting structure are connected to each other to restrict the lateral movement of the first platform seat relative to the second platform seat.

[0024] Optionally, the testing system further includes a sound insulation component, which covers the load motor and is sealed to the first platform base to shield or absorb the noise emitted by the load motor.

[0025] Optionally, the sound insulation assembly includes a sound insulation enclosure and an output component;

[0026] The soundproof enclosure is fitted over the load motor;

[0027] The output component is installed through the side wall of the soundproof enclosure. One end of the output component inside the soundproof enclosure is connected to the output shaft of the load motor, and the other end of the output component outside the soundproof enclosure is used to provide output torque.

[0028] Optionally, the soundproof enclosure is provided with an operating opening;

[0029] The sound insulation assembly also includes a closure member that is detachably connected to the operating opening for closing or opening the sound insulation enclosure.

[0030] The beneficial effects of the technical solutions provided in this application include at least the following:

[0031] The testing system provided in this application embodiment, when the load motor on the first platform base outputs torque to the electric drive assembly and performs NVH performance testing, both the electric drive assembly and the load motor will vibrate. The vibration is transmitted downwards through the first platform base to the second platform base in the form of waves. Because a functional component is provided between the first and second platform bases, when the vibration is transmitted to the functional component, the functional component can reduce at least part of the longitudinal vibration, so that some energy has been consumed before the longitudinal vibration is transmitted to the second platform base. The reduced longitudinal vibration continues to be transmitted downwards to the ground. The vibration frequency of this portion of vibration is different from the vibration frequency of the electric drive assembly and the load motor. The ground and the test system are unlikely to resonate. Even if resonance does occur, the vibration is transmitted in the reverse direction from the second platform to the functional components. After being reduced twice by the functional components, it is transmitted to the electric drive assembly and load motor on the first platform, thus having a smaller impact on the load motor and electric drive assembly. In addition, the lateral vibrations emitted by the electric drive assembly and load motor, in addition to the longitudinal vibrations, are also blocked by the functional components when the vibrations are transmitted from top to bottom and from bottom to top. This reduces the vibrations emitted by the electric drive assembly and load motor to the greatest extent, avoids resonance between the ground and the test system, reduces the interference of vibration on the test, and ensures the accuracy of the test. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A first structural schematic diagram of the test system provided in an embodiment of this application is shown;

[0034] Figure 2 A second structural schematic diagram of the test system provided in an embodiment of this application is shown;

[0035] Figure 3 A partially enlarged view of the test system provided in an embodiment of this application is shown;

[0036] Figure 4 A schematic diagram of the structure of the soundproof enclosure provided in an embodiment of this application is shown;

[0037] Figure 5 A schematic diagram of the structure of the closure provided in an embodiment of this application is shown.

[0038] 1. Load motor;

[0039] 2. First platform base; 21. Limiting component; 22. First groove; 23. Third groove; 24. Mounting base; 25. First receiving cavity; 26. Second receiving cavity;

[0040] 3. Second platform base; 31. Second limiting structure; 32. Second groove; 33. Fourth groove;

[0041] 4. Functional components; 41. First support member; 42. Moving component; 421. First motion unit; 422. Second motion unit; 423. Energy dissipation unit; 424. First limiting structure; 43. Second support member;

[0042] 5. Sound insulation component; 51. Sound insulation enclosure; 511. Operating opening; 512. Second sliding unit; 52. Output component; 53. Sealing component; 531. First sliding unit;

[0043] 6. Electric drive assembly.

[0044] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. To make the technical solutions and advantages of this application clearer, the test platform, etc., will be described in detail below with reference to the accompanying drawings.

[0046] The electric drive system is a core component of new energy vehicles. When the electric drive system is in a shifting state, it will generate noise due to electromagnetic force fluctuations and the meshing order characteristics of the gear pairs. This is a typical NVH problem of the electric drive system – howling.

[0047] Therefore, after the prototype of the electric drive assembly is manufactured, the NVH performance of the electric drive assembly must be tested to ensure that the NVH performance of the electric drive assembly meets the factory requirements.

[0048] In related technologies, the NVH performance testing system for electric drive assemblies mainly includes a test bench and a load motor mounted on the test bench. During testing, the electric drive assembly and the load motor are generally fixed to the upper surface of the test bench. The output torque of the load motor is adjusted multiple times, and test parameters (such as noise decibels) of the electric drive assembly are collected to test the NVH performance of the electric drive assembly.

[0049] However, during NVH performance testing of the electric drive assembly, the output torque of the load motor also causes vibrations in both itself and the electric drive assembly. These vibrations are transmitted through the test bench to the ground or other surfaces supporting the test bench. If the frequency of the vibration transmitted from the electric drive assembly to the ground matches the vibration frequency of the ground / carrier material, the test bench will resonate with the ground / carrier, thus interfering with the NVH performance test. Furthermore, the vibrations from the ground / carrier can also be transmitted back through the test bench to the electric drive assembly and the load motor, affecting them as well.

[0050] To address this, embodiments of this application provide a testing system, such as... Figure 1 and Figure 2 As shown, the test system is used to test the NVH performance of the electric drive assembly 6. The test system includes a load motor 1, a first platform base 2, a second platform base 3, and a functional component 4. The load motor 1 is fixed to the first platform base 2 and is used to provide output torque. The first platform base 2, the functional component 4, and the second platform base 3 are arranged in sequence. The functional component 4 is connected to the first platform base 2 and the second platform base 3 respectively, and is configured to at least partially reduce the longitudinal vibration transmitted from the first platform base 2 to the second platform base 3, and to prevent the first platform base 2 from transmitting lateral vibration to the second platform base 3.

[0051] As will be readily understood by those skilled in the art, vibration propagates forward in the form of waves, and vibration can be specifically divided into transverse vibration and longitudinal vibration according to the direction of wave propagation.

[0052] In the test system provided in this application embodiment, when the load motor 1 on the first platform 2 outputs torque to the electric drive assembly 6 for NVH performance testing, the electric drive assembly 6 will generate forced vibration (hereinafter referred to as "vibration"), and the load motor 1 will generate self-excited vibration (hereinafter referred to as "vibration"). The vibration is transmitted downward through the first platform 2 to the second platform 3 in the form of a wave. Since a functional component 4 is provided between the first platform 2 and the second platform 3, when the vibration is transmitted to the functional component 4, the functional component 4 can reduce at least part of the longitudinal vibration, so that when the longitudinal vibration is transmitted to the second platform 3 through the functional component 4, some of the energy has been consumed. The reduced longitudinal vibration continues to be transmitted downward to the ground. The vibration frequency of this part of the vibration is different from the vibration frequency of the electric drive assembly 6 and the load motor 1. Therefore, the ground and the test system are not likely to resonate. Even if the ground resonates, the vibration is transmitted in the opposite direction from the second platform 3 to the functional component 4. It is only after being reduced twice by the functional component 4 that it is transmitted to the electric drive assembly 6 and the load motor 1 on the first platform 2. The impact on the load motor 1 and the electric drive assembly 6 is small.

[0053] In addition, the lateral vibrations, in addition to the longitudinal vibrations, emitted by the electric drive assembly 6 and the load motor 1 are also blocked by the functional component 4 when the vibrations are transmitted from top to bottom and from bottom to top. This reduces the vibrations emitted by the electric drive assembly 6 and the load motor 1 to the greatest extent, avoids resonance between the ground and the test system, reduces the interference of vibration on the test, and ensures the accuracy of the test.

[0054] In some embodiments of this application, such as Figure 2 As shown, the first platform base 2 is located above the second platform base 3; the functional component 4 includes a first support member 41 and a moving member 42; the two ends of the first support member 41, which are opposite each other in the longitudinal direction, are respectively connected to the first platform base 2 and the second platform base 3; the moving member 42 is disposed at the connection between the first platform base 2 and the first support member 41, for allowing the first platform base 2 and the first support member 41 to move relative to each other in the lateral direction, and dissipating at least a portion of the energy of the lateral vibration; and / or, the moving member 42 is disposed at the connection between the second platform base 3 and the first support member 41, for allowing the second platform base 3 and the first support member 41 to move relative to each other in the lateral direction, and dissipating at least a portion of the energy of the lateral vibration.

[0055] It is easy to understand that in the embodiments of this application, "horizontal" refers to the horizontal direction and "vertical" refers to the vertical direction.

[0056] By setting a first support member 41 between the first platform base 2 and the second platform base 3, longitudinal support force is provided for the first platform base 2. A moving member 42 is set at the connection between the first platform base 2 and / or the second platform base 3 and the first support member 41, so that the first platform base 2 and / or the second platform base 3 can move relative to the first support member 41 in the lateral direction under the action of external force (the aforementioned lateral vibration). While moving, the moving member 42 can dissipate at least a part of the energy of the lateral vibration, so as to reduce the lateral vibration when the vibration is transmitted from top to bottom and from bottom to top, thereby reducing the vibration frequency of the vibration transmitted to the ground and making it different from the vibration frequency of the electric drive assembly 6 and the load motor 1. The ground is less likely to resonate with the test system, reducing the interference of the vibration of the load motor and the electric drive assembly 6 on the test.

[0057] In some embodiments of this application, such as Figure 2 and Figure 3As shown, the moving part 42 includes a first moving unit 421, a second moving unit 422, and an energy dissipation unit 423; the first moving unit 421 is connected to the first platform base 2 or the second platform base 3; the second moving unit 422 is connected to the first moving unit 421, and the second moving unit 422 can move laterally relative to the first moving unit 421; the energy dissipation unit 423 is connected to one of the first moving unit 421 and the second moving unit 422, and has a damped sliding engagement or a damped rolling engagement with the other of the first moving unit 421 and the second moving unit 422.

[0058] When the vibration is transmitted to the first motion unit 421 through the first platform seat 2 or the second platform seat 3, the first motion unit 421 can move relative to the second motion unit 422 in the lateral direction under the action of the external force lateral vibration. When moving relative to each other, the energy dissipation unit 423 provides damping force to dissipate at least a part of the energy of the lateral vibration, so as to prevent the first platform seat 2 from transmitting lateral vibration to the second platform seat 3, or prevent the second platform seat 3 from transmitting lateral vibration to the first platform seat 2.

[0059] Specifically, such as Figure 3 As shown, the first motion unit 421 and the second motion unit 422 can be one of a track and another of a slider that can slide in the track; the energy dissipation unit 423 can be a friction wheel connected to the slider. The friction wheel is configured to roll in the track and provide frictional resistance that hinders the sliding of the slider in order to dissipate the energy of lateral vibration.

[0060] Optionally, the slider can be a sliding frame or a slider. Those skilled in the art can select and adjust the type of slider according to actual needs.

[0061] During NVH performance testing, the output torque of the load motor 1 needs to be adjusted multiple times to test the NVH performance of the electric drive assembly 6 under different input torques. Therefore, the vibration energy emitted by the load motor 1 and the electric drive assembly 6 will also be different. Furthermore, the degree and range of the relative lateral movement of the first platform seat 2 and the second platform seat 3 caused by the vibration will also be different.

[0062] To prevent excessive swaying between the first and second platform seats, which could cause the friction wheel to disengage from its track and damage the equipment, some embodiments of this application, such as... Figure 3 As shown, the track extends laterally, and a first limiting structure 424 can be provided at each end of the track. The first limiting structure 424 is used to limit the range of movement of the friction wheel in the track to prevent the friction wheel from falling off the track.

[0063] In one example, the first limiting structure 424 includes two baffles, which are respectively disposed at both ends of the track. The length of the baffles is greater than the width of the track, so that they abut against the friction wheel when it moves to both ends of the track, thereby limiting the range of movement of the friction wheel in the track. The length direction of the baffles is the same as the width direction of the track.

[0064] In another example, the first limiting structure 424 includes a columnar connecting pile and a baffle. The connecting pile is fixed to the first platform seat 2, one end of the track is connected to the side wall of the connecting pile and extends laterally, and the baffle is disposed at the other end of the track. The connecting pile not only connects the track and the first platform seat 2, but also has a limiting function for the friction wheel.

[0065] Those skilled in the art can select and adjust the specific type of the first limiting structure 424 according to their needs. For example, the first limiting structure 424 can also be a limiting block.

[0066] In some embodiments of this application, such as Figure 2 As shown, the functional component 4 also includes at least one second support member 43, which is located between the first platform base 2 and the second platform base 3 and is connected to the first platform base 2 and the second platform base 3 respectively; wherein each second support member 43 is capable of elastic deformation in the longitudinal direction and / or the transverse direction, wherein the second support member 43 after elastic deformation in the transverse direction can dissipate at least a portion of the energy of the transverse vibration.

[0067] When longitudinal vibration is transmitted from the first platform seat 2 to the second platform seat 3, or from the second platform seat 3 to the first platform seat 2, since the second support member 43 can undergo elastic deformation along the longitudinal direction, a portion of the longitudinal vibration is converted into a compressive force on the second support member 43, causing the second support member to undergo elastic deformation. That is, a portion of the energy of the longitudinal vibration is absorbed by the second support member 43 and converted into the elastic potential energy of the second support member 43.

[0068] Furthermore, during the transmission of lateral vibration, the first platform seat 2 or the second platform seat 3 will move relative to the first support member 41, and at the same time, the second support member 43 will undergo elastic deformation in the lateral direction. Together with the friction wheel, they can dissipate the energy of the lateral vibration and prevent the lateral vibration from being transmitted further.

[0069] Optionally, the second support member 43 includes a telescopic rod and the aforementioned moving member 42; or, the second support member 43 is a spring. Those skilled in the art can select and adjust the type of the second support member 43 according to their needs.

[0070] In some embodiments of this application, a limiting member 21 is provided on the surface of the first platform seat 2 facing the second platform seat 3, and a second limiting structure 31 is provided on the surface of the second platform seat 3 facing the first platform seat 2; the first support member 41 is a telescopic rod, which has an extended state and a retracted state. In the extended state, there is a gap between the first platform seat 2 and the second platform seat 3, and the limiting member 21 and the second limiting structure 31 are separated from each other; in the retracted state, the first platform seat 2 is pressed onto the second platform seat 3, and the limiting member 21 and the second limiting structure 31 are connected to each other to restrict the lateral movement of the first platform seat 2 relative to the second platform seat 3.

[0071] The testing system provided in this application embodiment has a first state and a second state. When the testing system is in the first state, the telescopic rod is in the extended state. The telescopic rod and the second support member 43 together provide support force to the first platform seat 2, so that the first platform seat 2 and the second platform seat 3 are separated. At this time, the first platform seat and / or the second platform seat can move relative to the first support member to prevent the transmission of lateral vibration.

[0072] When the test system is in the second state, the telescopic rod is retracted, and the first platform seat 2 and the second platform seat 3 are in contact. The vibrations emitted by the load motor 1 and the electric drive assembly 6 are directly transmitted from the first platform seat 2 to the second platform seat 3. Under the action of gravity, longitudinal vibration will not change the longitudinal distance between the first platform seat 2 and the second platform seat 3, but lateral vibration may cause the relative positions of the first platform seat 2 and the second platform seat 3 to shift laterally. Therefore, the relative movement between the first platform seat 2 and the second platform seat 3 can be limited by the limiting member 21 and the second limiting structure 31.

[0073] Generally, when the accuracy requirements for NVH performance testing are not high, or when the vibration frequency of the load motor and electric drive assembly 6 differs significantly from the vibration frequency of the ground, the telescopic rod can be retracted, allowing the first platform seat 2 to press against the second platform seat 3, and the load motor 1 to apply torque to the electric drive assembly 6 for preliminary testing. When the output torque of the load motor increases, or when the test system resonates with the ground, the telescopic rod can be extended, cooperating with the second support member 43 to separate the first platform seat 2 and the second platform seat 3. The limiting member 21 and the second limiting structure 31 also separate from each other to reduce the interference of resonance on the test.

[0074] In some embodiments, the limiting member 21 can be a positioning pin, and the second limiting structure 31 can be a positioning groove. The positioning pin is inserted into the positioning groove to limit the relative movement of the first platform seat 2 and the second platform seat 3 in the lateral direction.

[0075] The locating pin can be column-shaped, cross-shaped, or other irregularly shaped, and the shape of the locating groove is adapted to the shape of the locating pin. Those skilled in the art can select and adjust the shape of the locating pin and the locating groove according to actual needs.

[0076] In some embodiments, the surface of the first platform seat 2 facing the second platform seat 3 may be provided with a plurality of spaced first grooves 22, and the surface of the second platform seat 3 facing the first platform seat 2 may be provided with a plurality of spaced second grooves 32. The first grooves 22 and the second grooves 32 are positioned in the lateral direction. When the telescopic rod is retracted and the first platform seat 2 is pressed against the second platform seat 3, the first groove 22 is engaged directly above the second groove 32. The two cooperate to form a first receiving cavity 25 for accommodating the first support member 41 and the moving member 42.

[0077] Furthermore, the surface of the first platform seat 2 facing the second platform seat 3 can be provided with multiple spaced third grooves 23, and the surface of the second platform seat 3 facing the first platform seat 2 can be provided with multiple spaced fourth grooves 33. The third grooves 23 and the fourth grooves 33 are positioned in the lateral direction. When the telescopic rod is retracted and the first platform seat 2 is pressed against the second platform seat 3, the third groove 23 is engaged directly above the fourth groove 33. The two cooperate to form a second receiving cavity 26 for accommodating the second support member 43. The first receiving cavity 25 and the second receiving cavity 26 are arranged alternately in the lateral direction, so that when the first platform seat 2 and the second platform seat 3 are in the second state described above, the first support member 41, the moving member 42 and the second support member 43 are all located inside the first platform seat 2 and the second platform seat 3 and are not exposed to the outside.

[0078] In one example, the first support member 41 is a telescopic rod, and the second support member 43 is a spring.

[0079] In this system, the spring can only passively deform under stress, while the telescopic rod is a rigid component. If longitudinal vibration is directly transmitted to the telescopic rod without buffering, repeated vibrations may damage the rod. Therefore, the top wall of the second receiving cavity 26 is further away from the second platform base 3 than the top wall of the first receiving cavity 25. That is, the second receiving cavity 26 is higher than the first receiving cavity 25, and the longitudinal length of the second receiving cavity 26 is greater than that of the first receiving cavity 25. This allows the longitudinal vibration transmitted by the load motor 1 and the electric drive assembly 6 to be transmitted to the spring first. After the spring absorbs part of the vibration energy, the longitudinal vibration is then transmitted to the first support member 41 and the sliding member, preventing damage to the telescopic rod and extending the service life of the testing system.

[0080] Currently, NVH performance testing of the electric drive assembly 6 is typically conducted in a semi-anechoic chamber, generally using the electric drive assembly 6 to drive the load motor 1 for simulated testing. Besides the issues mentioned in the above embodiments, vibrations emitted by the load motor 1 and the electric drive assembly 6 may affect the accuracy of the test, and the load motor 1 also generates some noise during the test. Since the testing system provided in this application primarily tests the NVH performance of the electric drive assembly 6, it is necessary to collect the noise emitted by the electric drive assembly 6 during operation; the noise from the load motor will also affect the accuracy of the NVH performance test.

[0081] In some embodiments of this application, such as Figure 1 As shown, the test system may also include a sound insulation component 5, which covers the load motor 1 and is sealed to the first platform base 2 to shield or absorb the noise emitted by the load motor 1 and prevent the noise emitted by the load motor 1 from interfering with the test.

[0082] In some embodiments, the sound insulation component 5 includes a sound insulation enclosure 51, which may be made of a sound insulation board (e.g., steel plate, aluminum plate, etc.) or a sound absorption board (e.g., wooden sound absorption board, fabric sound absorption board, etc.).

[0083] Alternatively, a sound-absorbing layer, such as sponge, can be laid on the inner wall of the soundproof enclosure 51 to absorb the noise emitted by the load motor 1.

[0084] Furthermore, the output shaft of the load motor 1 needs to be connected to the input shaft of the electric drive assembly 6 to achieve torque transmission. However, to avoid noise interference from the load motor 1, the above embodiment provides a sound insulation component 5 around the load motor 1 for noise reduction. With this configuration, a through hole needs to be opened on the side of the sound insulation enclosure 51 facing the electric drive assembly 6 to connect the output shaft of the load motor 1 to the input shaft of the electric drive assembly 6. To ensure the rotation of both shafts, the diameter of the through hole must be larger than the outer diameter of the two shafts. Therefore, during testing, some noise will inevitably be transmitted through the gap between the through hole and the two shafts, thus interfering with the test.

[0085] Therefore, in some embodiments of this application, such as Figure 4 As shown, in addition to the soundproof enclosure 51, the soundproofing assembly 5 may also include an output component 52; the soundproof enclosure 51 is covered by the load motor 1; the output component 52 passes through the side wall of the soundproof enclosure 51, one end of the output component 52 located inside the soundproof enclosure 51 is connected to the output shaft of the load motor 1, and the other end of the output component 52 located outside the soundproof enclosure 51 is used to provide output torque.

[0086] By setting an output component 52 on the soundproof enclosure 51 to transmit the output torque of the load motor 1 to the electric drive assembly 6, the possibility of noise inside the soundproof assembly 5 being transmitted to the outside world is further reduced.

[0087] Optionally, the output component 52 is a universal joint, which is sealed to the side wall of the soundproof enclosure 51.

[0088] Generally, the bottom of the soundproof enclosure 51 is open to facilitate the mounting of the load motor 1. In order to ensure the sound insulation effect at the opening, in some embodiments, the top of the first platform base 2 may be provided with a groove, and an elastic sealing element is provided on the inner wall of the groove. The four peripheral walls of the soundproof enclosure 51, except for the top wall, are inserted into the groove and abut against the elastic sealing element, thereby achieving a sealed connection of the soundproof enclosure 51.

[0089] Optionally, the elastic element is a sealing strip made of rubber or silicone.

[0090] After the soundproof enclosure 51 is placed over the load motor 1, it is necessary to connect the output shaft of the load motor 1 to the universal joint, or to adjust the torque of the load motor 1. Therefore, in some embodiments of this application, such as Figure 4 and Figure 5 As shown, the soundproof enclosure 51 may have an operation opening 511; the soundproofing assembly 5 may also include a closure 53, which is detachably connected to the operation opening 511 for closing or opening the soundproof enclosure 51.

[0091] When the above operations need to be performed, the operator or the machine only needs to open the closure 53 and complete the operation through the operation opening 511, making the operation more convenient.

[0092] In some embodiments, the closure 53 can be a door, with a first sliding unit 531 installed on the side wall of the door and a second sliding unit 512 installed on the side wall of the soundproof enclosure 51 for forming the operation opening 511. The first sliding unit 531 and the second sliding unit 512 can slide relative to each other after they cooperate, so as to realize the closing and opening of the door operation opening 511.

[0093] Optionally, the first sliding unit 531 is a slider and the second sliding unit 512 is a slide groove; or, the first sliding unit 531 is a guide block and the second sliding unit 512 is a slide rail. Those skilled in the art can select and adjust the types of the first sliding unit 531 and the second sliding unit 512 according to actual needs.

[0094] In some embodiments, such as Figure 1As shown, the test system includes two load motors and two sound insulation components, as well as two mounting platforms. The two mounting platforms are located on both sides of the upper surface of the first platform base and are connected to the upper surface of the first platform base. Each mounting platform is fixedly mounted with a load motor, so that the output shaft of the load motor is coaxial with the input shaft of the electric drive assembly 6. Each load motor is covered with a sound insulation component to block the noise emitted by the load motor.

[0095] In some embodiments, the testing system further includes an encoder connected to the load motor, which receives signals and adjusts the output torque of the load motor according to the signals, eliminating the need for manual adjustment and making the testing more convenient and labor-saving.

[0096] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0097] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0098] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A testing system for testing the NVH performance of an electric drive assembly, characterized in that, The test system includes a load motor (1), a first platform base (2), a second platform base (3), and functional components (4); The load motor (1) is fixed to the first platform base (2) and is used to provide output torque; The first platform base (2), the functional component (4) and the second platform base (3) are arranged in sequence. The functional component (4) is connected to the first platform base (2) and the second platform base (3) respectively, and is configured to at least partially reduce the longitudinal vibration transmitted from the first platform base (2) to the second platform base (3), and prevent the first platform base (2) from transmitting lateral vibration to the second platform base (3). The first platform base (2) is located above the second platform base (3); The functional component (4) includes a first support member (41) and a moving member (42); The first support member (41) is connected to the first platform base (2) and the second platform base (3) at its opposite ends in the longitudinal direction, respectively; The moving part (42) is disposed at the connection between the first platform seat (2) and the first support member (41) to allow the first platform seat (2) and the first support member (41) to move relative to each other in the lateral direction and dissipate at least a portion of the energy of the lateral vibration; and / or, the moving part (42) is disposed at the connection between the second platform seat (3) and the first support member (41) to allow the second platform seat (3) and the first support member (41) to move relative to each other in the lateral direction and dissipate at least a portion of the energy of the lateral vibration; The moving part (42) includes a first moving unit (421), a second moving unit (422), and an energy-consuming unit (423); The first motion unit (421) is connected to the first platform base (2) or the second platform base (3); The second motion unit (422) is connected to the first motion unit (421), and the second motion unit (422) can move laterally relative to the first motion unit (421); The energy-consuming unit (423) is connected to one of the first motion unit (421) and the second motion unit (422), and is in damped sliding or damped rolling engagement with the other of the first motion unit (421) and the second motion unit (422); The functional component (4) further includes at least one second support member (43), which is located between the first platform base (2) and the second platform base (3) and is connected to the first platform base (2) and the second platform base (3) respectively; Each of the second support members (43) is capable of elastic deformation in the longitudinal and / or transverse directions, wherein the second support member (43) after elastic deformation in the transverse direction can dissipate at least a portion of the energy of the transverse vibration.

2. The testing system according to claim 1, characterized in that, The first motion unit (421) and the second motion unit (422) are respectively one of a track and a slider that can slide in the track; The energy-consuming unit (423) is a friction wheel connected to the sliding member. The friction wheel is configured to roll in the track and provide frictional resistance that prevents the sliding member from sliding.

3. The testing system according to claim 2, characterized in that, The track extends laterally, and a first limiting structure (424) is provided at each end of the track. The first limiting structure (424) is used to limit the range of movement of the friction wheel in the track to prevent the friction wheel from coming off the track.

4. The testing system according to any one of claims 1 to 3, characterized in that, The first platform base (2) is provided with a limiting member (21) on the surface facing the second platform base (3), and the second platform base (3) is provided with a second limiting structure (31) on the surface facing the first platform base (2); The first support member (41) is a telescopic rod, which has an extended state and a retracted state. In the extended state, there is a gap between the first platform seat (2) and the second platform seat (3), and the limiting member (21) and the second limiting structure (31) are separated from each other. In the retracted state, the first platform seat (2) is pressed against the second platform seat (3), and the limiting member (21) is connected to the second limiting structure (31) to restrict the lateral movement of the first platform seat (2) relative to the second platform seat (3).

5. The testing system according to any one of claims 1 to 3, characterized in that, The testing system also includes a sound insulation component (5), which covers the load motor (1) and is sealed to the first platform base (2) to shield or absorb the noise emitted by the load motor (1).

6. The testing system according to claim 5, characterized in that, The sound insulation component (5) includes a sound insulation enclosure (51) and an output component (52); The soundproof enclosure (51) is installed over the load motor (1); The output component (52) passes through the side wall of the soundproof enclosure (51). One end of the output component (52) inside the soundproof enclosure (51) is connected to the output shaft of the load motor (1). The other end of the output component (52) outside the soundproof enclosure (51) is used to provide output torque.

7. The testing system according to claim 6, characterized in that, An operation opening (511) is provided on the soundproof enclosure (51); The sound insulation component (5) also includes a closure (53) which is detachably connected to the operating opening (511) for closing or opening the sound insulation enclosure (51).

Images