Drive axle test device and drive axle test method

Abstract

The present application proposes a drive axle test device and a drive axle test method. The drive axle test device includes a first drive axle, a second drive axle, a drive device and three load devices. The first drive axle includes a first differential and a first planetary gear train, and the first differential includes a first input gear set and a first output gear set. The second drive axle includes a second differential and a second planetary gear train, and the second differential includes a second input gear set and a second output gear set, and the second input gear set is transmission-connected to the first output gear set. The drive device is transmission-connected to the first input gear set to input positive torque. The three load devices are transmission-connected to the second output gear set, the first planetary gear train and the second planetary gear train respectively to input negative torque. The present application transmits torque from the first drive axle to the second drive axle by transmission-connecting the second input gear set to the first output gear set, thereby testing the first drive axle and the second drive axle at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of drive axles, and in particular to a drive axle testing device and a drive axle testing method. Background Art

[0002] During automobile production, every component must be tested to ensure overall performance and quality. Drive axles are closely related to a vehicle's power output, making drive axle testing crucial. Professional drive axle testing equipment is typically used in automobile production, but traditional drive axle testing equipment suffers from low testing efficiency. Summary of the Invention

[0003] Based on this, it is necessary to provide a drive axle test device and a drive axle test method to address the problem of low test efficiency of traditional drive axle test devices.

[0004] According to a first aspect of the present application, a drive axle test device is provided, comprising:

[0005] A first drive axle includes a first differential and a first planetary gear train, wherein the first differential further includes a first input gear set and a first output gear set in driving connection, and the sun gear of the first planetary gear train is coaxially arranged with the first input gear set;

[0006] a second drive axle, comprising a second differential and a second planetary gear train, wherein the second differential further comprises a second input gear set and a second output gear set in driving connection, the second input gear set is in driving connection with the first output gear set, and the second planetary gear train is in driving connection with the second output gear set;

[0007] a driving device, drivingly connected to the first input gear set, for inputting positive torque to the first input gear set; and

[0008] Three load devices are respectively connected to the second output gear set, the first planetary gear train and the second planetary gear train to input negative torque to the second output gear set, the first planetary gear train and the second planetary gear train.

[0009] In one embodiment, the first output gear set includes a third planetary gear train, the second input gear set includes a fourth planetary gear train, and the third planetary gear train is drivingly connected to the fourth planetary gear train.

[0010] In one embodiment, a first flange is coaxially provided on the ring gear of the third planetary gear train, and a second flange corresponding to the first flange is provided on the ring gear of the fourth planetary gear train. The first flange and the second flange are coaxially arranged and connected to each other.

[0011] In one embodiment, the sun gear of the third planetary gear train is in driving connection with the first input gear set, and the sun gear of the fourth planetary gear train is in driving connection with the second output gear set.

[0012] In one embodiment, the system further includes a first differential lock corresponding to the first differential and a second differential lock corresponding to the second differential, wherein the first differential lock is installed on the first differential to lock or unlock the first differential; and the second differential lock is installed on the second differential to lock or unlock the second differential.

[0013] In one embodiment, the first input gear set includes a first bevel gear and an input bevel gear that mesh with each other, the input bevel gear is in driving connection with the driving device, the first bevel gear is coaxially arranged with the sun gear of the first planetary gear train, and the first bevel gear is in driving connection with the first output gear set, and the diameter of the first bevel gear is larger than the diameter of the input bevel gear;

[0014] The second output gear set includes a second bevel gear and an output bevel gear that are meshed with each other. The output bevel gear is transmission-connected to the load device. The second bevel gear is coaxially arranged with the sun gear of the second planetary gear train, and the second bevel gear is transmission-connected to the second input gear set. The diameter of the second bevel gear is larger than the diameter of the output bevel gear.

[0015] In one embodiment, each of the load devices comprises a torque machine, one of the three torque machines is drivingly connected to the second output gear set, another one of them is drivingly connected to the first planetary gear train, and another one of them is drivingly connected to the second planetary gear train.

[0016] In one embodiment, the driving device includes a motor and a transmission, the output shaft of the motor is connected to the input shaft of the transmission to change the output torque of the motor, and the output shaft of the transmission is connected to the first input gear set.

[0017] According to a second aspect of the present application, a drive axle test method is provided. The drive axle test method is performed using the drive axle test device described above. The drive axle test device has a multi-drive axle test mode. The drive axle test method includes:

[0018] activating the three load devices to input negative torque to the second output gear set, the first planetary gear train, and the second planetary gear train respectively;

[0019] The drive device is activated to input positive torque to the first input gear set and place the drive axle test device in the multi-drive axle test mode.

[0020] In one embodiment, the drive axle test device further includes a first differential lock installed on the first differential and a second differential lock installed on the second differential; the drive axle test device further includes a differential test mode;

[0021] The test method of the drive axle also includes:

[0022] disconnecting the first differential from the first differential lock;

[0023] connecting the second differential to the second differential lock;

[0024] Setting the load device connected to the second output gear set to heavy-load operation, setting the load device connected to the first planetary gear train to light-load operation, and setting the load device connected to the second planetary gear train to no-load operation;

[0025] The drive device is activated to input positive torque to the first input gear set and place the drive axle test device in the differential test mode.

[0026] In the technical solution of this application, by drivingly connecting the second input gear set to the first output gear set, torque is input from the first drive axle to the second drive axle, thereby simultaneously testing the first and second drive axles. A drive device is used to input positive torque into the first drive axle. Load devices are provided on the output portions of the first and second drive axles, respectively, and are used to input negative torque, thereby applying a certain load to the components of the first and second drive axles. This simultaneously verifies the fatigue strength of the components of the first and second drive axles.

[0027] In this case, the first output gear set of the first drive axle is transmission-connected to the second input gear set of the second drive axle. This reduces the output portion of the first drive axle by one, thus requiring only three load devices. One of the three load devices is transmission-connected to the second output gear set, another is transmission-connected to the first planetary gear train, and yet another is transmission-connected to the second planetary gear train. This allows for simultaneous testing of both the first and second drive axles, increasing testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1A schematic structural diagram of an embodiment of a drive axle test device provided in this application;

[0029] Figure 2 This is a flow chart of an embodiment of a test method for a drive axle proposed in this application;

[0030] Figure 3 This is a flow chart of another embodiment of the test method for a drive axle proposed in this application.

[0031] Description of Figure Numbers:

[0032]

[0033] DETAILED DESCRIPTION

[0034] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0037] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0038] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0040] During automobile production, every component must be tested to ensure overall performance and quality. Drive axles are closely related to a vehicle's power output, making drive axle testing crucial. Professional drive axle testing equipment is typically used in automobile production, but traditional drive axle testing equipment suffers from low testing efficiency.

[0041] In traditional drive axle test devices, only a single drive axle can be tested at a time, which directly leads to the problem of low test efficiency. However, there is currently no drive axle test device that can test multiple drive axles simultaneously. In view of this, the present application proposes a drive axle test device to solve the problem of low test efficiency of existing drive axle test devices. Figure 1 This is a structural schematic diagram of an embodiment of the drive axle test device provided in this application.

[0042] See also Figure 1The drive axle test device 100 proposed in this application includes a first drive axle 1, a second drive axle 2, a drive device 3, and three load devices 4. The first drive axle 1 includes a first differential 11 and a first planetary gear train 12. The first differential 11 also includes a first input gear set 111 and a first output gear set 112 in driving connection. The sun gear of the first planetary gear train 12 is coaxially arranged with the first input gear set 111.

[0043] The second drive axle 2 includes a second differential 21 and a second planetary gear train 22. The second differential 21 also includes a second input gear set 211 and a second output gear set 212 that are transmission-connected. The second input gear set 211 is transmission-connected to the first output gear set 112, and the second planetary gear train 22 is transmission-connected to the second output gear set 212. The drive device 3 is transmission-connected to the first input gear set 111 for inputting positive torque to the first input gear set 111.

[0044] The three load devices 4 are respectively connected to the second output gear set 212 , the first planetary gear set 12 and the second planetary gear set 22 to input negative torque to the second output gear set 212 , the first planetary gear set 12 and the second planetary gear set 22 .

[0045] In the technical solution of this application, by drivingly connecting the second input gear set 211 with the first output gear set 112, torque is input from the first drive axle 1 to the second drive axle 2, thereby simultaneously testing the first drive axle 1 and the second drive axle 2. The drive device 3 is used to input positive torque into the first drive axle 1. The output parts of the first drive axle 1 and the second drive axle 2 are respectively provided with a load device 4, which is used to input negative torque, thereby applying a certain load to the various components of the first drive axle 1 and the second drive axle 2. In this way, the fatigue strength of each component of the first drive axle 1 and the second drive axle 2 is simultaneously verified.

[0046] The first output gear set 112 of the first drive axle 1 is in driving connection with the second input gear set 211 of the second drive axle 2. This reduces the output portion of the first drive axle 1 by one, and therefore only requires three load devices 4. One of the three load devices 4 is in driving connection with the second output gear set 212, another is in driving connection with the first planetary gear train 12, and yet another is in driving connection with the second planetary gear train 22. This allows for simultaneous testing of the first and second drive axles 1 and 2, increasing testing efficiency.

[0047] In practical applications, the second output gear set 212 of the second drive axle 2 can be drivingly connected to the input gear set of another drive axle, thereby further increasing the number of drive axles that can be tested by the drive axle testing apparatus 100. However, in practice, the drive device 3 is located relatively far from the drive axle, resulting in significant torque loss during transmission. Therefore, the drive axle testing apparatus cannot test too many drive axles at a time, and the selection should be based on the specific test conditions.

[0048] In some embodiments, the first output gear set 112 includes a third planetary gear train 112 a , and the second input gear set 211 includes a fourth planetary gear train 211 a , and the third planetary gear train 112 a is drivingly connected to the fourth planetary gear train 211 a .

[0049] A typical drive axle configuration typically includes a differential and two speed reducers. However, in this embodiment, the first planetary gear set 12 and the third planetary gear set 112a in the first drive axle 1 each constitute a speed reducer, while the second planetary gear set 22 and the fourth planetary gear set 211a in the second drive axle 2 each constitute a speed reducer. The third planetary gear set 112a and the fourth planetary gear set 211a are drivingly connected, thereby transmitting torque from the first drive axle 1 to the second drive axle 2. Furthermore, the first output gear set 112 and the second input gear set 211 can also be other speed reducer embodiments, such as a gear reducer or a worm reducer.

[0050] In some embodiments, a first flange is coaxially provided on the ring gear of the third planetary gear train 112a, and a second flange corresponding to the first flange is provided on the ring gear of the fourth planetary gear train 211a. The first flange and the second flange are coaxially provided and connected to each other.

[0051] In this embodiment, the ring gear of the third planetary gear train 112a and the ring gear of the fourth planetary gear train 211a are connected to each other via a first flange and a second flange, thereby enabling the ring gear of the third planetary gear train 112a and the ring gear of the fourth planetary gear train 211a to rotate synchronously. There are many ways to connect the first and second flanges. For example, the first and second flanges can each have threaded holes to allow them to be screwed together, or they can be welded together.

[0052] In some embodiments, the sun gear of the third planetary gear train 112 a is in driving connection with the first input gear set 111 , and the sun gear of the fourth planetary gear train 211 a is in driving connection with the second output gear set 212 .

[0053] During gear transmission, when a small gear with a smaller diameter and fewer teeth transmits torque to a larger gear with a larger diameter and more teeth, the speed of the larger gear decreases relative to the small gear, while the torque increases. Conversely, when the larger gear transmits torque to the small gear, the speed of the small gear increases relative to the larger gear, while the torque decreases. Therefore, in this embodiment, the first input gear set 111 transmits torque to the sun gear of the third planetary gear train 112a. The sun gear of the third planetary gear train 112a then transmits torque to the ring gear with a larger diameter and more teeth. At this time, the speed of the ring gear decreases, while the torque increases. To ensure the normal operation of the reducer, the drive axle's transmission from the first input gear set 111 to the third planetary gear train 112a is fixed to reduce speed and increase torque. However, the large positive torque may require the load device 4 to input a corresponding large negative torque, which places a significant burden on the load device 4.

[0054] The ring gear of the third planetary gear train 112a is fixedly connected to the ring gear of the fourth planetary gear train 211a, so the ring gear of the fourth planetary gear train 211a rotates synchronously with the ring gear of the third planetary gear train 112a. The ring gear of the fourth planetary gear train 211a transmits torque to the sun gear of the fourth planetary gear train 211a. Since the sun gear has a smaller diameter and a larger number of teeth, the speed of the sun gear of the fourth planetary gear train 211a increases while the torque decreases. Therefore, the positive torque transmitted from the first drive axle 1 to the second drive axle 2 accelerates and reduces torque, so the load device 4 connected to the second output gear set 212 only needs to output a smaller negative torque to complete the test, reducing the burden on the load device 4.

[0055] In some embodiments, the drive axle test device 100 further includes a first differential lock 5 corresponding to the first differential 11 and a second differential lock 6 corresponding to the second differential 21. The first differential lock 5 is installed on the first differential 11 to lock or unlock the first differential 11; the second differential lock 6 is installed on the second differential 21 to lock or unlock the second differential 21.

[0056] In this embodiment, the drive axle testing apparatus 100 adjusts the states of the first differential 11 and the second differential 21 by configuring a first differential lock 5 and a second differential lock 6. By adjusting the operating states of the first differential 11, the second differential 21, and the three load devices 4, the drive axle testing apparatus 100 can implement various operating modes. For example, the first differential 11 can be opened, the second differential 21 locked, the load device 4 connected to the second output gear set 212 set to heavy load operation, the load device 4 connected to the first planetary gear set 12 set to light load operation, and the load device 4 connected to the second planetary gear set 22 set to no load operation. This results in different loads at the two output ends of the first differential 11, which in turn requires the first differential 11 to have different rotational speeds between the first planetary gear set 12 and the second input gear set 211 to correspond to different loads, thereby testing the differential performance of the first differential 11. Based on the same transmission principle, the drive axle testing apparatus 100 can perform various test modes.

[0057] The first differential lock 5 and the second differential lock 6 make the transmission mode of the drive axle test device 100 more variable, so that the drive axle test device 100 can set different test modes for various components of the first drive axle 1 and the second drive axle 2, thereby improving the test effect.

[0058] In some embodiments, the first input gear set 111 includes a first bevel gear 1111 and an input bevel gear 1112 that are meshed with each other, the input bevel gear 1112 is in transmission connection with the drive device 3, the first bevel gear 1111 is coaxially arranged with the sun gear of the first planetary gear train 12, and the first bevel gear 1111 is in transmission connection with the first output gear set 112, and the diameter of the first bevel gear 1111 is greater than the diameter of the input bevel gear 1112.

[0059] The second output gear set 212 includes a second bevel gear 2121 and an output bevel gear 2122 that are meshed with each other. The output bevel gear 2122 is transmission-connected to the load device 4. The second bevel gear 2121 is coaxially arranged with the sun gear of the second planetary gear train 22. The second bevel gear 2121 is transmission-connected to the second input gear set 211, and the diameter of the second bevel gear 2121 is larger than the diameter of the output bevel gear 2122.

[0060] During gear transmission, when a small gear with a smaller diameter and fewer teeth transmits torque to a larger gear with a larger diameter and more teeth, the larger gear's speed decreases relative to the smaller gear, while its torque increases. Conversely, when the larger gear transmits torque to the small gear, the small gear's speed increases relative to the larger gear's, while its torque decreases. In this embodiment, when input bevel gear 1112 transmits torque to first bevel gear 1111, because first bevel gear 1111 has a larger diameter, its speed decreases relative to input bevel gear 1112, while its torque increases.

[0061] When the second bevel gear 2121 transmits torque to the output bevel gear 2122, because the diameter of the second bevel gear 2121 is larger than that of the output bevel gear 2122, the speed of the output bevel gear 2122 increases relative to the second bevel gear 2121, while the torque of the output bevel gear 2122 decreases, thereby achieving accelerated torque reduction. This reduces the negative torque required to be output by the load device 4 connected to the output bevel gear 2122, thereby reducing the burden on the load device 4.

[0062] In some embodiments, each load device 4 includes a torque machine 4a. One of the three torque machines 4a is in transmission connection with the second output gear set 212, another is in transmission connection with the first planetary gear train 12, and yet another is in transmission connection with the second planetary gear train 22. In practical applications, the load device 4 generally employed in the drive axle test apparatus 100 is a torque machine 4a. The torque machine 4a is a conventional torque output device capable of stably outputting torque, ensuring the accuracy of the drive axle test apparatus 100 test. Of course, the drive axle test apparatus 100 can also utilize other drive devices 3 as the load device 4, such as a motor, and this is not a limitation herein.

[0063] In some embodiments, the driving device 3 includes a motor and a transmission. The output shaft of the motor is connected to the input shaft of the transmission to change the output torque of the motor. The output shaft of the transmission is connected to the first input gear set 111 .

[0064] In this embodiment, the drive device 3 outputs torque through a motor and adjusts the motor output speed through a transmission, thereby making the torque and speed output by the drive device 3 more precise, thereby improving the test accuracy of the drive axle test device 100. Of course, the drive device 3 can also use other power sources, such as a rotary cylinder, an engine, etc., but these options may not be as suitable for drive axle testing as motors. Therefore, the choice of power source in the drive device 3 is not limited here and can be adjusted according to usage requirements and usage environment.

[0065] See also Figures 2 to 3The present application also proposes a drive axle test method, which is performed using the drive axle test device 100 of any of the above embodiments. The drive axle test device 100 has multiple drive axle test modes. The drive axle test method includes:

[0066] S10 : The three load devices 4 are activated to input negative torques to the second output gear set 212 , the first planetary gear train 12 and the second planetary gear train 22 .

[0067] S11 : starting the driving device 3 to input positive torque to the first input gear set 111 , and placing the drive axle testing device 100 in a multi-drive axle testing mode.

[0068] In this embodiment, by drivingly connecting the second input gear set 211 to the first output gear set 112, torque is input from the first drive axle 1 to the second drive axle 2, thereby simultaneously testing the first drive axle 1 and the second drive axle 2. When the drive device 3 is activated, torque is transmitted to the first differential 11 via the first input gear set 111. The torque is then output to the first planetary gear set 12 and the first output gear set 112 through the first differential 11. The first planetary gear set 12 is connected to the load device 4, thereby testing the fatigue strength of the first planetary gear set 12 and the first input gear set 111.

[0069] Afterwards, the first output gear set 112 is connected to the second input gear set 211, and the torque is transmitted to the second differential 21 through the second input gear set 211. The second differential 21 transmits the torque to the second output gear set 212 and the second planetary gear set 22 respectively. The second output gear set 212 and the second planetary gear are respectively connected to a load device 4, thereby testing the fatigue strength of the first output gear set 112, the second input gear set 211, the second output gear set 212, and the second planetary gear set 22.

[0070] As described above, the multi-drive axle test mode can test the fatigue strength of each component of the first drive axle 1 and the second drive axle 2, thereby simultaneously testing multiple drive axles, thereby improving test efficiency.

[0071] In some embodiments, the drive axle test apparatus 100 further includes a first differential lock 5 installed on the first differential 11 and a second differential lock 6 installed on the second differential 21; the drive axle test apparatus 100 also has a differential test mode. The drive axle test method further includes:

[0072] S20: Disconnect the first differential 11 from the first differential lock 5.

[0073] S21: Connect the second differential 21 to the second differential lock 6.

[0074] S22: The load device 4 connected to the second output gear set 212 is set to heavy load operation, the load device 4 connected to the first planetary gear train 12 is set to light load operation, and the load device 4 connected to the second planetary gear train 22 is set to no load operation.

[0075] S23 : Start the driving device 3 to input positive torque to the first input gear set 111 , and put the drive axle testing device 100 into the differential test mode.

[0076] In this embodiment, the differential lock can lock or unlock the differential. When the differential is locked, differential operation is impossible. The first differential 11 is disconnected from the first differential lock 5, so the first differential 11 is unlocked and can perform differential operation. The second differential 21 is connected to the second differential lock 6, which causes the second differential 21 to be locked and unable to perform differential operation. When the drive device 3 is started, torque is transmitted from the first input gear set 111 to the first differential 11. The first differential 11 transmits the torque to the first planetary gear set 12 and the first output gear set 112. The first output gear set 112 transmits the torque sequentially through the second input gear set 211 and the second differential 21. The second planetary gear set 22 is in an unloaded state, and the second differential 21 is locked and cannot perform differential operation. Therefore, the second differential 21 inputs most of the torque into the second output gear set 212. In other words, the torque is ultimately transmitted to the second output gear set 212 and the first planetary gear set 12.

[0077] It should be noted that the load device 4 connected to the second output gear set 212 is operating under heavy load, while the load device 4 connected to the first planetary gear set 12 is operating under light load. Therefore, the rotational resistance of the second output gear set 212 and the first planetary gear set 12 are different. Therefore, the first differential 11 needs to make the rotational speeds of the first planetary gear set 12 and the second output gear set 212 different, that is, to perform differential speed, thereby verifying the differential performance of the first differential 11.

[0078] In this application, the drive axle testing method is capable of testing not only the differential performance of the first differential 11, but also the second differential 21. To test the differential performance of the second differential 21, the first differential 11 is connected to the first differential lock 5, and the second differential 21 is disconnected from the second differential lock 6. Thereafter, the load device 4 connected to the first planetary gear train 12 is operated at no load, the load device 4 connected to the second planetary gear train 22 is operated at a heavy load, and the load device 4 connected to the second output gear set 212 is operated at a light load.

[0079] At this point, the drive device 3 is activated, and the first input gear set 111 inputs torque into the first differential 11. The first differential 11 cannot perform differential operation and outputs the same torque to the first planetary gear set 12 and the first output gear set 112. The first planetary gear set 12 is now unloaded. The first output gear set 112 then sequentially transmits the torque to the second input gear set 211 and the second differential 21. The second differential 21 then transmits the torque to the second planetary gear set 22 and the second output gear set 212, respectively. Since the second planetary gear set 22 and the second output gear set 212 are under different loads at this point, the second differential 21 must achieve a different rotational speed between the second planetary gear set 22 and the second output gear set 212, effectively performing differential operation. This demonstrates the differential performance of the second differential 21.

[0080] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A drive axle test device, characterized in that: include: A first drive axle includes a first differential and a first planetary gear train, wherein the first differential further includes a first input gear set and a first output gear set in driving connection, and the sun gear of the first planetary gear train is coaxially arranged with the first input gear set; a second drive axle, comprising a second differential and a second planetary gear train, wherein the second differential further comprises a second input gear set and a second output gear set in driving connection, the second input gear set is in driving connection with the first output gear set, and the second planetary gear train is in driving connection with the second output gear set; a driving device, drivingly connected to the first input gear set, for inputting positive torque to the first input gear set; as well as, Three load devices are respectively connected to the second output gear set, the first planetary gear train and the second planetary gear train to input negative torque to the second output gear set, the first planetary gear train and the second planetary gear train.

2. The drive axle test device according to claim 1, characterized in that: The first output gear set includes a third planetary gear train, the second input gear set includes a fourth planetary gear train, and the third planetary gear train is drivingly connected to the fourth planetary gear train.

3. The drive axle test device according to claim 2, characterized in that: A first flange is coaxially provided on the ring gear of the third planetary gear train, and a second flange corresponding to the first flange is provided on the ring gear of the fourth planetary gear train. The first flange and the second flange are coaxially arranged and connected to each other.

4. The drive axle test device according to claim 3, characterized in that: The sun gear of the third planetary gear train is in driving connection with the first input gear set, and the sun gear of the fourth planetary gear train is in driving connection with the second output gear set.

5. The drive axle test device according to claim 1, characterized in that: The system further includes a first differential lock corresponding to the first differential and a second differential lock corresponding to the second differential, wherein the first differential lock is installed on the first differential to lock or unlock the first differential; The second differential lock is installed on the second differential to lock or unlock the second differential.

6. The drive axle test device according to claim 1, characterized in that: The first input gear set includes a first bevel gear and an input bevel gear that mesh with each other, the input bevel gear is in transmission connection with the driving device, the first bevel gear is coaxially arranged with the sun gear of the first planetary gear train, and the first bevel gear is in transmission connection with the first output gear set, and the diameter of the first bevel gear is larger than the diameter of the input bevel gear; The second output gear set includes a second bevel gear and an output bevel gear that are meshed with each other. The output bevel gear is transmission-connected to the load device. The second bevel gear is coaxially arranged with the sun gear of the second planetary gear train, and the second bevel gear is transmission-connected to the second input gear set. The diameter of the second bevel gear is larger than the diameter of the output bevel gear.

7. The drive axle test device according to claim 1, characterized in that: Each of the load devices includes a torque machine, one of the three torque machines is transmission-connected to the second output gear set, another one of them is transmission-connected to the first planetary gear train, and another one of them is transmission-connected to the second planetary gear train.

8. The drive axle test device according to claim 1, characterized in that: The driving device includes a motor and a transmission. The output shaft of the motor is connected to the input shaft of the transmission to change the output torque of the motor. The output shaft of the transmission is connected to the first input gear set.

9. A test method for a drive axle, characterized in that: The test is performed using the drive axle test device according to any one of claims 1 to 8, wherein the drive axle test device has a multi-drive axle test mode, and the drive axle test method includes: activating the three load devices to input negative torque to the second output gear set, the first planetary gear train, and the second planetary gear train respectively; The drive device is activated to input positive torque to the first input gear set and place the drive axle test device in the multi-drive axle test mode.

10. The test method of the drive axle according to claim 9, characterized in that: The drive axle test device further includes a first differential lock installed on the first differential and a second differential lock installed on the second differential; The drive axle test device also has a differential test mode; The test method of the drive axle also includes: disconnecting the first differential from the first differential lock; connecting the second differential to the second differential lock; Setting the load device connected to the second output gear set to heavy-load operation, setting the load device connected to the first planetary gear train to light-load operation, and setting the load device connected to the second planetary gear train to no-load operation; The drive device is activated to input positive torque to the first input gear set and place the drive axle test device in the differential test mode.

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