Vehicle test device

Abstract

The present invention provides a vehicle test device, comprising: a test bench, the test bench includes a driving part, and the driving part has an output shaft; a multi-functional combined half shaft device, the first end of the multi-functional combined half shaft device is connected to the output shaft, and the multi-functional combined half shaft device is selectively connected to at least one of a differential housing, a half shaft gear, and a spider shaft of a differential. By applying the technical solution of the present invention, the multi-functional combined half shaft device can be arbitrarily combined and connected with the differential housing, the half shaft gear, and the spider shaft of the differential to realize a variety of vehicle tests, making the multi-functional combined half shaft device more practical. The vehicle test device can test more types of vehicles during the vehicle test stage, reducing the vehicle test cost.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle testing, and more particularly, to a vehicle test device. Background Art

[0002] With the increasing improvement of production and living standards, automotive products are becoming increasingly popular. In automotive products, the transmission system is one of the core assemblies that drive the vehicle to operate. Its core components are various transmission assemblies, which adjust the torque and speed from the engine or motor and convert them into the torque and speed required for vehicle operation, and then transmit them to the wheels through the drive shaft to drive the vehicle to operate according to the driver's intention. During the development process of transmission products, various types of bench tests and verifications, such as function, performance, reliability, and durability tests, are required. Among them, there are a large number of no-load or low-load test contents, such as lubrication tests, ventilation tests, sealing tests, disconnect device durability tests, drag torque tests, etc. In order to achieve power transmission or high-speed operation requirements at the drive input end on the test bench, it is often necessary to use the output end to drive the product to operate to meet the highest speed requirements of the sample. For example, the input speed of current electric vehicle reducer products is basically between 15,000 rpm and 18,000 rpm. If input drive is used, a high-speed drive bench needs to be invested, which is costly and has a long procurement cycle. For example, when conducting a sealing test, a disconnection mode test of a disconnect function sample, or a drag test, it is necessary to drive the sample to operate from both sides.

[0003] On a real vehicle, the output end of the transmission is connected to the splined half shafts and both wheels through the differential gears. In order to meet the requirements of vehicle operation and turning, a differential is provided in the transmission, which allows the two half shafts to rotate at different speeds. In conventional lubrication, ventilation, and sealing test benches, only one drive motor is configured. If only one side of the half shaft is driven to rotate, the other side of the half shaft will rotate in the opposite direction, and the power will not be transmitted to the input shaft. At this time, it is necessary to cancel the differential function of the differential so that when the drive motor outputs drive to one side of the half shaft, the power can still be transmitted to the input end. The conventional solution is to use a welding method to cancel the differential function. This method will cause waste of differential samples, and at the same time, the welding quality will also affect the test cycle. Once the differential becomes unsealed during the test process, it is necessary to repeatedly disassemble and assemble the sample, which is likely to cause damage to oil seals, tooth surfaces, and other components and affect the test results.

[0004] In addition, in order to achieve output end drive, it is necessary to customize a vehicle half shaft or a substitute half shaft fixture with exactly the same parameters that matches the product's differential side gear and oil seal. Since spline connections are used, the spline parameters of different products are also different. Specialized cutting tools are required for machining splines. The trial production enterprise needs to customize the tools separately, resulting in a high production cost and long cycle for this half shaft device. If splines are not machined with specialized tools, parameter non-compliance often occurs, making assembly impossible or difficult. This solution seriously affects the test progress and makes the product development cycle uncontrollable.

[0005] During the transmission test process described above, the following problems exist: 1. The high cost and unreliability of differential lock encountered in single output end drive; 2. Difficulties in trial production of the specialized half shaft device, long cycle, high cost, and poor practicability of the above-mentioned half shaft device, making the vehicle test process cumbersome and the economic and time costs consumed by the test relatively high.

[0006] Regarding the problem of high vehicle test costs caused by the low practicability of the above-mentioned half shaft device, no effective solution has been proposed yet. Summary of the Invention

[0007] The main purpose of the present invention is to provide a vehicle test device to solve the problem of high vehicle test costs caused by the low practicability of the half shaft device in the prior art.

[0008] To achieve the above object, according to one aspect of the present invention, a vehicle test device is provided, including: a test bench frame, the test bench frame includes a driving part, and the driving part has an output shaft; a multi-functional combined half shaft device, the first end of the multi-functional combined half shaft device is connected to the output shaft, and the multi-functional combined half shaft device is selectively connected to at least one of a differential housing, a differential side gear, and a spider shaft of a differential.

[0009] Further, the multi-functional combined half shaft device includes: a connecting flange, the first end of the connecting flange is connected to the output shaft; an adjusting ring, the adjusting ring is arranged at the second end of the connecting flange, and there is at least one adjusting ring; a sealing ring, the sealing ring is arranged close to the adjusting ring, and the adjusting ring is arranged between the connecting flange and the sealing ring; a tensioning ring, the tensioning ring abuts against one end of the sealing ring; wherein, during the test, the outer ring of the sealing ring abuts against the inner ring of the output oil seal of the differential, and the outer peripheral surface of the tensioning ring is arranged with a gap from the differential housing, or at least part of the tensioning ring abuts against the differential housing.

[0010] Further, the multi-functional combined half shaft device further includes: a spline connection ring, the spline connection ring is arranged adjacent to the tensioning ring, and spline teeth are arranged on the outer peripheral surface of the spline connection ring, and the spline teeth are arranged to match the internal splines of the differential side gear of the differential.

[0011] Further, the multi-functional combined half shaft device further includes: a spline shaft locking device, which has a locking state for locking the spline shaft of the differential and a releasing state for releasing the spline shaft of the differential.

[0012] Further, the tensioning ring includes: a base, which is provided with a receiving cavity extending along the axial direction of the base, and at least one opening groove structure is provided on the outer peripheral surface of the base and is communicatively arranged with the wall surface of the receiving cavity; a positioning assembly, at least part of which is located in the receiving cavity, at least part of which can extend to the outside of the base through the opening groove structure, and the positioning assembly is rotatably arranged in the receiving cavity to adjust the length of the positioning assembly extending to the outside of the base; the positioning assembly has an initial position and a tensioning position. When the positioning assembly is in the initial position, there is a gap between the positioning assembly and the differential housing. When the positioning assembly is in the tensioning position, the positioning assembly abuts against the differential housing.

[0013] Further, the receiving cavity includes a first cavity and a second cavity. The first cavity extends along the axial direction of the base and is used for receiving at least part of the positioning assembly. The positioning assembly is rotatably arranged in the first cavity. The second cavity is provided on the wall of the first cavity. There are multiple second cavities, and the multiple second cavities are circumferentially spaced along the first cavity. The second cavity extends along the radial direction of the base, and the opening groove structure is communicatively arranged with the second cavity. The positioning assembly located in the second cavity can be arranged to move along the radial direction of the base.

[0014] Further, the positioning assembly includes: a tensioning cam, which is located in the receiving cavity and is rotatably arranged in the receiving cavity; a tensioning ejector pin, which is located in the receiving cavity, and at least part of the tensioning ejector pin extends to the outside of the base through the opening groove structure; the tensioning ejector pin is in contact with the outer peripheral surface of the tensioning cam. Driving the tensioning cam to rotate circumferentially can drive the tensioning ejector pin to move radially along the base to adjust the length of the tensioning ejector pin extending to the outside of the base.

[0015] Further, the tensioning cam includes: a cam body, and a plurality of guiding structures are provided on the outer peripheral surface of the cam body. The plurality of guiding structures are arranged with a distance therebetween. The guiding structures extend along the circumferential direction of the cam body, and the distance between the guiding structures and the central axis of the cam body changes gradually along the circumferential direction of the cam body. The guiding structures are in contact with at least part of the tensioning ejector pin. Rotating the cam body drives the tensioning ejector pin to move along the circumferential direction of the guiding structure to adjust the length of the tensioning ejector pin extending to the outside of the base.

[0016] Further, the guiding structure includes two adjacent guiding surfaces, both of which are arc-shaped surfaces, and the distance between the two guiding surfaces and the central axis of the cam body increases gradually along the direction in which the two adjacent guiding surfaces gradually separate.

[0017] Furthermore, the tensioning thimble includes: a thimble portion; a thimble base, the first end of the thimble base is connected to the thimble portion, and the second end of the thimble base is provided with an arc-shaped working surface that cooperates with the guiding structure. The thimble base abuts against the guiding structure through the arc-shaped working surface. When the tensioning cam rotates, it drives the thimble base to move circumferentially along the guiding structure, thereby adjusting the length of the thimble portion extending outside the base.

[0018] Applying the technical solution of the present invention, the multi-functional combined half shaft device can be arbitrarily combined and connected with the differential case, the differential half gear, and the spider shaft of the differential to achieve various vehicle tests, making the multi-functional combined half shaft device more practical. The vehicle test device can test more types of vehicles during the vehicle test stage, reducing the vehicle test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0020] Figure 1 shows an exploded schematic view of an embodiment of the multi-functional combined half shaft device according to the present invention;

[0021] Figure 2 shows a schematic structural view of an embodiment of the multi-functional combined half shaft device according to the present invention;

[0022] Figure 3 shows a schematic structural view of a first embodiment of the tensioning ring according to the present invention;

[0023] Figure 4 shows a schematic structural view of a second embodiment of the tensioning ring according to the present invention;

[0024] Figure 5 shows a schematic structural view of a first embodiment of the base according to the present invention;

[0025] Figure 6 shows a schematic structural view of a second embodiment of the base according to the present invention;

[0026] Figure 7 shows a schematic structural view of a third embodiment of the base according to the present invention;

[0027] Figure 8 shows a schematic structural view of a first embodiment of the tensioning cam according to the present invention;

[0028] Figure 9 shows a schematic structural view of a second embodiment of the tensioning cam according to the present invention;

[0029] Figure 10 Shows a schematic structural diagram of a third embodiment of a tensioning cam according to the present invention;

[0030] Figure 11 Shows a schematic structural diagram of a fourth embodiment of a tensioning cam according to the present invention;

[0031] Figure 12 Shows a schematic structural diagram of a first embodiment of a tensioning ejector pin according to the present invention;

[0032] Figure 13 Shows a schematic structural diagram of a second embodiment of a tensioning ejector pin according to the present invention;

[0033] Figure 14 Shows a schematic structural diagram of a third embodiment of a tensioning ejector pin according to the present invention;

[0034] Figure 15 Shows a schematic structural diagram of an embodiment of a common tensioning ring according to the present invention;

[0035] Figure 16 Shows a schematic structural diagram of an embodiment of a differential according to the present invention.

[0036] Among them, the above-mentioned drawings include the following reference numerals:

[0037] 1. Connecting flange; 2. Adjusting ring; 3. Sealing ring; 5. Common tensioning ring; 6. Spline connecting ring; 7. One-way shaft locking device; 8. First locking bolt; 9. Spline teeth; 10. Locking screw; 11. Second locking bolt; 12. Third locking bolt; 13. First base; 14. Second base; 16. Return spring;

[0038] 4. Tensioning ring; 41. Base; 42. Positioning component;

[0039] 410. Accommodating cavity; 4101. First cavity; 4102. Second cavity; 411. Open groove structure;

[0040] 421. Tensioning cam; 4210. Cam body; 4211. Guide structure; 4212. Guide surface;

[0041] 422. Tensioning ejector pin; 4221. Ejector pin part; 4222. Ejector pin base; 4223. Arc working surface;

[0042] 81. Output oil seal; 82. Differential housing; 83. Internal spline of half shaft gear; 84. One-way shaft; 85. Planet gear; 86. Half shaft gear. Detailed implementation manners

[0043] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0046] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concepts of these exemplary embodiments are fully conveyed to those of ordinary skill in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and thus their descriptions will be omitted.

[0047] To facilitate the description of the application environment of the multi-functional combined half shaft device and the vehicle test device in this embodiment, the differential structure is introduced as follows. As Figure 16 shown, the differential includes an output oil seal 81, a differential housing 82, an internal spline of the half shaft gear 83, a spider shaft 84, a planetary gear 85, and a half shaft gear 86.

[0048] Combined Figures 1 to 16 shown, according to a specific embodiment of the present application, a vehicle test device is provided.

[0049] The vehicle test device includes a test bench and a multi-functional combined half shaft device. The test bench includes a driving part which has an output shaft. The first end of the multi-functional combined half shaft device is connected to the output shaft, and the multi-functional combined half shaft device can be selectively connected to at least one of the differential case 82, the differential side gear 86, and the spider shaft 84 of the differential.

[0050] Applying the technical solution of this embodiment, the multi-functional combined half shaft device can be arbitrarily combined and connected with the differential case 82, the differential side gear 86, and the spider shaft 84 of the differential to achieve a variety of vehicle tests, making the multi-functional combined half shaft device more practical. The vehicle test device can test more types of vehicles during the vehicle test stage, reducing the vehicle test cost.

[0051] Furthermore, the multi-functional combined half shaft device includes a connecting flange 1, an adjusting ring 2, a sealing ring 3, and a tensioning ring 4. The first end of the connecting flange 1 is connected to the output shaft. The adjusting ring 2 is arranged at the second end of the connecting flange 1, and there is at least one adjusting ring 2. The sealing ring 3 is arranged close to the adjusting ring 2, and the adjusting ring 2 is arranged between the connecting flange 1 and the sealing ring 3. The tensioning ring 4 abuts against one end of the sealing ring 3. Wherein, during the test, the outer ring of the sealing ring 3 abuts against the inner ring of the output oil seal 81 of the differential, and the outer peripheral surface of the tensioning ring 4 is arranged with a gap from the differential case 82, or at least part of the tensioning ring 4 abuts against the differential case 82.

[0052] Among them, the connecting flange 1 is a general part and is connected to a general transition shaft. Such a connection structure can promote the generalization of the connection transition fixtures of different test benches, and different products can be connected with a unified interface fixture, greatly reducing the product test cost. The adjusting ring 2 can be determined whether to be used and the number of used ones according to the length of the half shaft. The sealing ring 3 is adjusted according to the size of the output oil seal 81 of the differential. The tensioning ring 4 can keep a gap with the differential case 82 or be in a state of abutting against the differential case 82. It should be noted that the gap between the tensioning ring 4 and the differential case 82 can be set to be non-adjustable to maintain the gap between the tensioning ring 4 and the differential case 82, or the corresponding structure can be set on the tensioning ring 4 to adjust the gap between the tensioning ring 4 and the differential case 82 (that is, the tensioning ring 4 is an adjustable structure at this time). By setting the connecting flange 1, the adjusting ring 2, and the sealing ring 3, the connection between the vehicle test device and the differential can be made more stable, and the power output can be smoothly transmitted from the driving part to the differential to achieve vehicle testing. The various settings of the tensioning ring 4 enable the selection of whether to connect the multi-functional combined half shaft device to the differential case 82 according to the actual test needs, improving the practicality of the vehicle test device.

[0053] Furthermore, the multi-functional combined half shaft device further includes a spline connection ring 6, which is arranged adjacent to the tensioning ring 4. Spline teeth 9 are provided on the outer peripheral surface of the spline connection ring 6, and the spline teeth 9 are arranged to match the internal spline 83 of the half shaft gear of the differential.

[0054] Specifically, the spline connection ring 6 is a standard part, and only a few spline teeth 9 with the same shape need to be trial-produced according to the requirements of the internal spline 83 of the half shaft gear of different differential products. When transmitting large torque by splines, the number of spline teeth can be increased. By providing the spline connection ring 6, power can be transmitted along the internal spline 83 of the half shaft gear to the differential, which is suitable for transmitting large torque tests.

[0055] Furthermore, the multi-functional combined half shaft device further includes a one-piece shaft locking device 7, which has a locking state for locking the one-piece shaft 84 of the differential and a releasing state for releasing the one-piece shaft 84 of the differential.

[0056] Specifically, the one-piece shaft locking device 7 directly connects the internal spline 83 of the half shaft gear and the one-piece shaft 84 together so that the half shaft gear 86 and the planetary gear 85 cannot rotate relative to each other, thereby achieving the purpose of locking the differential function. Since the size of the one-piece shaft of market products is relatively fixed, several general specifications can also be made according to the product type. Specifically, in this embodiment, the one-piece shaft locking device 7 has a locking groove, which extends along the radial direction of the one-piece shaft locking device 7. When the one-piece shaft locking device 7 is in the locking state, at least part of the one-piece shaft 84 is located in the locking groove. When the one-piece shaft locking device 7 is in the releasing state, that is, the one-piece shaft locking device 7 can be cancelled in the multi-functional combined half shaft device.

[0057] Combined with the above embodiments, according to the structural characteristics of the product, a complete shaft is decomposed into several parts such as the connecting flange 1, the adjusting ring 2, the sealing ring 3, the tensioning ring 4, the spline connection ring 6 and the one-piece shaft locking device 7 according to the functional requirements of each part, covering all the characteristic structural parts of a normal vehicle half shaft. Each part forms a fixed module. According to different usage requirements, such as whether to lock the differential, whether to use splines, whether to use a tensioning ring, etc., the corresponding functional modules are selected to quickly assemble a half shaft that meets the requirements. Among them, the connecting flange 1, the adjusting ring 2, the tensioning ring 4, and the one-piece shaft locking device 7 are common parts, and the sealing ring 3 and the spline teeth part of the spline connection ring 6 need to be adjusted according to the product structure. Through the combination of several modules, not only can the lossless locking function of various differentials be realized, but also rapid trial production can be achieved. The manufacturing cost for different product requirements is very low, and the versatility is very high. It can meet multiple test usage scenarios of various connection methods such as single-side output, double-side output, and lossless locking of the differential.

[0058] For different usage scenarios and fixing methods, after selecting the required functional module combinations, the lossless locking function of the differential and the power transmission requirements can be achieved, realizing the rapid connection of the product. For special products, only a few small components such as the sealing ring, spline teeth, or one-way shaft locking device need to be trial-produced. These components have simple structures and can be quickly trial-produced. The basic module of the multi-functional combined half-shaft device in this embodiment has a low trial-production cost and a short cycle. The module to be replaced has a simple structure and is easy to trial-produce. While meeting the test usage requirements, it achieves high efficiency, low cost, and short cycle. Moreover, the multi-functional combined half-shaft device in this embodiment can quickly respond to the test requirements of different scenarios. Especially for off-the-shelf products and benchmark products in the market, even without the fine structural parameters of the product, connection can be basically achieved, and the test work can be quickly carried out.

[0059] Further, the tensioning ring 4 includes a base 41 and a positioning component 42. The base 41 is provided with a receiving cavity 410, and the receiving cavity 410 extends along the axial direction of the base 41. At least one opening groove structure 411 is formed on the outer peripheral surface of the base 41, and the opening groove structure 411 is communicatively arranged with the wall surface of the receiving cavity 410; at least part of the positioning component 42 is located in the receiving cavity 410, and at least part of the positioning component 42 can extend to the outside of the base 41 through the opening groove structure 411. The positioning component 42 is rotatably arranged in the receiving cavity 410 to adjust the length of the positioning component 42 extending outside the base 41; the positioning component 42 has an initial position and a tensioning position. When the positioning component 42 is in the initial position, the positioning component 42 is arranged with a gap from the differential housing 82. When the positioning component 42 is in the tensioning position, the positioning component 42 abuts against the differential housing 82. By providing the base 41 and the positioning component 42, part of the positioning component 42 is located in the receiving cavity 410, and part of the positioning component 42 can extend to the outside of the base 41 through the opening groove structure 411. While realizing the adjustment of the length of the positioning component 42 extending outside the base 41, the positioning component 42 is prevented from detaching from the base 41, realizing the limit fixation of the positioning component 42.

[0060] It should be noted that the opening groove structure 411 in this embodiment is only for facilitating the positioning component 42 to extend outside the base 41. According to actual needs, the opening groove structure 411 can also be set to other structures that can achieve corresponding functions.

[0061] Preferably, in the exemplary embodiment of the present application, when the positioning component 42 is in the initial position, the outer peripheral surface of the positioning component 42 is flush with the outer peripheral surface of the base 41. According to actual needs, when the positioning component 42 is in the initial position, the distance between the outer peripheral surface of the positioning component 42 and the outer peripheral surface of the base 41 can be adaptively adjusted. For example, the positioning component 42 can be completely received in the receiving cavity 410, or part of the positioning component 42 can be extended outside the base 41.

[0062] Further, the accommodation cavity 410 includes a first cavity 4101 and a second cavity 4102. The first cavity 4101 extends along the axial direction of the base 41 and is used to accommodate at least a part of the positioning assembly 42. The positioning assembly 42 is rotatably arranged in the first cavity 4101. The second cavity 4102 is opened on the cavity wall of the first cavity 4101. There are multiple second cavities 4102, and the multiple second cavities 4102 are arranged at intervals along the circumferential direction of the first cavity 4101. The second cavity 4102 extends along the radial direction of the base 41, and the opening groove structure 411 is communicatively arranged with the second cavity 4102. The positioning assembly 42 located in the second cavity 4102 can be movably arranged along the radial direction of the base 41. The extending direction of the second cavity 4102 is different from that of the first cavity 4101, so that the position of the positioning assembly 42 located in the first cavity 4101 is fixed, and the moving direction of the positioning assembly 42 located in the second cavity 4102 is fixed, avoiding the positioning assembly 42 from shaking during the movement and affecting the test results.

[0063] In an exemplary embodiment of the present application, a total of three second cavities 4102 are opened, and the three second cavities 4102 are evenly arranged along the circumferential direction of the first cavity 4101.

[0064] Further, the positioning assembly 42 includes a tensioning cam 421 and a tensioning ejector pin 422. The tensioning cam 421 is located in the accommodation cavity 410 and is rotatably arranged in the accommodation cavity 410; the tensioning ejector pin 422 is located in the accommodation cavity 410, and at least a part of the tensioning ejector pin 422 extends outside the base 41 through the opening groove structure 411; the tensioning ejector pin 422 is in contact with the outer peripheral surface of the tensioning cam 421. Driving the tensioning cam 421 to rotate circumferentially can drive the tensioning ejector pin 422 to move radially along the base 41 to adjust the length of the tensioning ejector pin 422 extending outside the base 41. By arranging the tensioning cam 421 and the tensioning ejector pin 422, when the tensioning cam 421 rotates circumferentially, the part of the tensioning ejector pin 422 in contact with the outer peripheral surface of the tensioning cam 421 moves, thereby converting the circumferential rotation of the tensioning cam 421 into the radial linear motion of the tensioning ejector pin 422. By setting the size of the part of the tensioning ejector pin 422 in contact with the outer peripheral surface of the tensioning cam 421, various radial linear motions of the tensioning ejector pin 422 can be realized. For example, the distance between the profile line of the outer peripheral surface of the tensioning cam 421 and the central axis of the tensioning cam 421 can be designed according to a preset rule, so that the tensioning ejector pin 422 performs a reciprocating linear motion in the radial direction. By adjusting the change amplitude and change frequency of this distance, various motion modes of the tensioning ejector pin 422 can be obtained.

[0065] Further, the tensioning cam 421 includes a cam body 4210. A plurality of guiding structures 4211 are provided on the outer peripheral surface of the cam body 4210. The plurality of guiding structures 4211 are arranged with a distance therebetween. The guiding structures 4211 extend along the circumferential direction of the cam body 4210. The distance between the guiding structures 4211 and the central axis of the cam body 4210 is arranged to gradually change along the circumferential direction of the cam body 4210. At least a part of the guiding structures 4211 abuts against the tensioning ejector pin 422. When the cam body 4210 rotates, it drives the tensioning ejector pin 422 to move along the circumferential direction of the guiding structures 4211, so as to adjust the length of the tensioning ejector pin 422 extending outside the base 41. The guiding structures 4211 can drive the tensioning ejector pin 422 to perform a linear motion along a preset direction. By providing a plurality of guiding structures 4211 and arranging the plurality of guiding structures 4211 with a distance therebetween, the tensioning ejector pin 422 has a distance adjustment section and a distance maintaining section. That is, when the tensioning ejector pin 422 contacts the guiding structures 4211, the cam body 4210 rotates, and the tensioning ejector pin 422 moves along the circumferential direction of the guiding structures 4211 to adjust the length of the tensioning ejector pin 422 extending outside the base 41. When the cam body 4210 rotates to a position where a part between the tensioning ejector pin 422 and an adjacent guiding structure 4211 provided on the cam body 4210 abuts, by continuing to rotate the cam body 4210, the length of the tensioning ejector pin 422 extending outside the base 41 remains unchanged. In this way, during use, the adjustment of the tensioning ejector pin 422 is more convenient, and it is also convenient to position the tensioning ejector pin 422 during installation.

[0066] Further, the guiding structure 4211 includes two connected guiding surfaces 4212. Both of the two guiding surfaces 4212 are arc-shaped surfaces. The distances between the two guiding surfaces 4212 and the central axis of the cam body 4210 are arranged to gradually increase along the direction in which the two connected guiding surfaces 4212 gradually separate.

[0067] Combined with the foregoing embodiments, when various numbers and various sizes of guiding structures 4211 are provided on the cam body 4210, correspondingly, when the cam body 4210 is rotated by different angles, the adjustment precision of the tensioning ejector pin 422 is also different. Optionally, to improve the adjustment precision of the tensioning ejector pin 422, the included angle between the two guiding surfaces 4212 can be set to be relatively large to achieve fine adjustment of the tensioning ejector pin 422. To save adjustment time, the included angle between the two guiding surfaces 4212 can also be set to be relatively small. And the number of the guiding structures 4211 is arranged corresponding to the number of the tensioning ejector pins 422. To make the connection between the tensioning ring 4 and the differential housing 82 more stable, various numbers of guiding structures 4211, such as four, five, six, etc., can also be provided.

[0068] Further, the tensioning thimble 422 includes a thimble portion 4221 and a thimble base 4222. The first end of the thimble base 4222 is connected to the thimble portion 4221. An arc-shaped working surface 4223 that cooperates with the guiding structure 4211 is provided at the second end of the thimble base 4222. The thimble base 4222 abuts against the guiding structure 4211 through the arc-shaped working surface 4223. When the tensioning cam 421 rotates, it drives the thimble base 4222 to move circumferentially along the guiding structure 4211, thereby adjusting the length of the thimble portion 4221 extending outside the base 41. By providing the arc-shaped working surface 4223, when the positioning assembly 42 is in the initial position, the arc-shaped working surface 4223 of the tensioning thimble 422 can be completely attached to the guiding surface 4212 of the guiding structure 4211, improving the space utilization rate and reducing the volume of the parts. Moreover, the setting of the arc-shaped working surface 4223 reduces frictional damage to the contact surface between the outer peripheral surface of the cam body 4210 and the tensioning thimble 422 during the rotation of the tensioning cam 421. The smooth transition can reduce material wear, making the movement between components more smooth and extending the service life.

[0069] The present application provides a preferred embodiment of a tensioning ring 4. The tensioning ring 4 includes a base 41 and a positioning assembly 42. The base 41 includes a first base 13 and a second base 14. The first base 13 is provided with a first connection hole that penetrates axially. The first end of the first base 13 is connected to the sealing ring 3. A first receiving cavity is provided at the second end of the first base 13, and the first receiving cavity extends along the axial direction of the first base 13; the second base 14 is provided with a second connection hole that penetrates axially. The first end of the second base 14 is connected to the second end of the first base 13. A second receiving cavity is provided at the first end of the second base 14, and the second receiving cavity extends along the axial direction of the second base 14. The second receiving cavity communicates with the first receiving cavity to form a receiving cavity 410; at least one of the outer peripheral surfaces of the first base 13 and the second base 14 is provided with at least one opening groove structure 411, and the opening groove structure 411 is communicatively arranged with the wall surface of at least one of the first receiving cavity and the second receiving cavity. Optionally, a threaded structure is provided at the second end of the second base 14.

[0070] Furthermore, the first accommodation cavity of the first base 13 includes the aforementioned first cavity 4101 and second cavity 4102. Specifically, one end of the first base 13 facing the second base 14 is provided with the first cavity 4101, and the first cavity 4101 extends along the axial direction of the first base 13. The first cavity 4101 is used to accommodate at least part of the positioning assembly 42, and the positioning assembly 42 is rotatably arranged in the first cavity 4101. The second cavity 4102 is opened on the wall of the first cavity 4101. There are multiple second cavities 4102, and the multiple second cavities 4102 are arranged at intervals along the circumferential direction of the first cavity 4101. The second cavity 4102 extends along the radial direction of the first base 13. An opening groove structure 411 is opened on the outer peripheral surface of the first base 13, and the opening groove structure 411 is communicated with the second cavity 4102. The positioning assembly 42 located in the second cavity 4102 can be arranged to move along the radial direction of the first base 13.

[0071] Furthermore, the positioning assembly 42 includes a tensioning cam 421 and a tensioning ejector pin 422. The tensioning cam 421 is provided with two sets of internal and external threads, an adjustment hole, and a guiding surface 4212. The guiding surface 4212 contacts the arc-shaped working surface 4223 at the second end of the ejector pin base 4222 of the tensioning ejector pin 422. When the tensioning cam 421 rotates, the guiding surface 4212 pushes the tensioning ejector pin 422 to extend or retract radially; the external thread of the tensioning cam 421 is connected to the internal thread of the first base 13. During assembly, the tensioning cam 421 and the first base 13 are first connected together by threads, and the screwing depth is adjusted to a suitable position. At this time, the lowest position of the guiding surface 4212 contacts the arc-shaped working surface 4223 of the ejector pin base 4222, and then the tensioning ejector pin 422, the return spring 16, and the second base 14 are assembled into a complete tensioning ring 4; the tensioning cam 421 can be rotated through the adjustment hole of the tensioning cam 421 to push the tensioning ejector pin 422 to move radially; by connecting the internal thread of the tensioning cam 421 to the third locking bolt 12, the position of the tensioning ejector pin 422 can be kept unchanged during the operation of the differential sample. When the tensioning ejector pin 422 extends, it squeezes the return spring 16, and when the tensioning ejector pin 422 retracts, the return spring 16 pushes it to retract quickly.

[0072] Furthermore, in an exemplary embodiment of the present application, the tensioning ring 4 further includes a common tensioning ring 5. The common tensioning ring 5 is arranged with a gap from the differential housing 82, and the distance between the common tensioning ring 5 and the differential housing 82 is not adjustable. That is to say, the common tensioning ring 5 does not have the radial dimension adjustment function of the tensioning ring 4 in the above embodiment.

[0073] Apply the multi-functional combined half shaft device in the above embodiments. By selectively combining and using the tensioning ring 4, ordinary tensioning ring 5, spline connection ring 6, and single-shaft locking device 7, the lossless locking function of various differentials can be achieved. According to different test requirements, such as whether to lock the differential, whether to use splines, whether to use tensioning rings, etc., select the corresponding functional modules to quickly assemble a test half shaft that meets the requirements. Specifically, four combination modes and their application scenarios will be exemplified in this embodiment. It should be noted that the combination modes in this embodiment are not limited to the four modes described in this embodiment:

[0074] Mode 1: Only use the tensioning ring 4;

[0075] Connect the connecting flange 1, adjusting ring 2, sealing ring 3, and tensioning ring 4 in sequence, and the second locking bolt 11 and the third locking bolt 12 to form a short shaft. The power is transmitted through the tensioning thimble 422 pressed between the tensioning ring 4 and the differential housing 82. At this time, the differential as a whole can be directly driven to rotate through the tensioning ring 4, and there is no relative rotation of the half shaft gear 86 of the differential. Mode 1 is applicable to test scenarios such as no-load oil temperature and sealing tests.

[0076] Specifically, the assembly process is as follows: S1, first select a tensioning thimble 422 with a suitable length according to the size of the differential housing part, replace the tensioning thimble 422, and then connect the connecting flange 1, adjusting ring 2, sealing ring 3, and tensioning ring 4 in sequence, and connect each component together through the second locking bolt 11 to obtain the test half shaft of Mode 1; S2, insert the assembled test half shaft into the differential sample, confirm the insertion depth according to the oil seal position and the positioning requirements of the sample itself, and then use a tightening wrench to adjust the tensioning ring 4 through the hole inside the half shaft. By rotating the tensioning cam 421, the tensioning thimble 422 is moved to extend outwards until the tensioning thimble 422 abuts against the inner wall of the differential housing 82; S3, rotate the angle of the tensioning cam 421 to adjust the tensioning degree; S4, after adjusting the tensioning cam 421, connect it to the tensioning cam 421 with the third locking bolt 12 to fasten the whole device. The power transmission path of Mode 1 is: transmitted through the connecting flange 1 to the tensioning thimble 422, and then to the differential housing 82. The entire differential is driven to rotate by driving the differential housing, and there is no relative rotation between the half shaft gear 86 and the planetary gear 85. Through this connection method, the lossless connection of the differential is synchronously achieved while ensuring the overall rotation of the differential.

[0077] Mode 2: Use the ordinary tensioning ring 5, spline connection ring 6, and single-shaft locking device 7;

[0078] Assemble the connecting flange 1, adjusting ring 2, sealing ring 3, ordinary tensioning ring 5, spline connecting ring 6 and one-way shaft locking device 7 in sequence. Fix the one-way shaft 84 through the one-way shaft locking device 7 so that the planetary gear 85 and the half shaft gear 86 cannot rotate relative to each other. Connect with the half shaft gear 86 through the spline connecting ring 6, and drive the vehicle differential assembly to operate through the half shaft gear 86.

[0079] Specifically, the assembly process is as follows: S1, fasten the spline teeth 9 to be used to the spline connecting ring 6 with the locking screw 10, and then fix the spline connecting ring 6 and the one-way shaft locking device 7 together with the first locking bolt 8; S2, combine the ordinary tensioning ring 5, sealing ring 3, adjusting ring 2, and connecting flange 1 in sequence, fix them with the second locking bolt 11, and then dock this assembly with the previously combined assembly (i.e., the assembly of the spline connecting ring 6 and the one-way shaft locking device 7), and fasten them with the third locking bolt 12 to obtain the test half shaft of mode two; S3, slowly insert the assembled test half shaft into the differential sample. After the spline teeth 9 enter the half shaft gear 86, gently rotate it continuously, and at the same time slowly push the test half shaft to insert until the one-way shaft locking device 7 completely locks the one-way shaft 84. The test half shaft of mode two can drive the entire differential to operate. Due to the locking effect of the one-way shaft locking device 7, the half shaft gear 86 and the planetary gear 85 inside the differential cannot rotate relative to each other, realizing the lossless locking of the differential while transmitting power through the spline of the half shaft.

[0080] Mode three: Use the tensioning ring 4, spline connecting ring 6 and one-way shaft locking device 7;

[0081] As Figure 2 shown, assemble the connecting flange 1, adjusting ring 2, sealing ring 3, tensioning ring 4, spline connecting ring 6 and one-way shaft locking device 7 in sequence. The selected first locking bolt 8 is a long bolt. The first locking bolt 8 is connected to the second base 14, and drives the differential to operate through the spline connecting ring 6, tensioning ring 4 and one-way shaft locking device 7. At this time, since the spline connecting ring 6 and the tensioning ring 4 transmit power simultaneously, it can be applied to a larger torque transmission working scenario.

[0082] Specifically, the assembly process is as follows: S1. First, assemble the spline teeth 9 and the spline connection ring 6 together with the locking screw 10, then dock the single-shaft locking device 7 and fix it with the first locking bolt 8; S2. Assemble the connecting flange 1, the adjusting ring 2, the sealing ring 3, and the tensioning ring 4 (a threaded structure is provided in the second base 14 of the tensioning ring 4) together in sequence and fix them with the second locking bolt 11; S3. Replace the first locking bolt 8 with a long bolt to fix the two components (i.e., the component obtained in S1 and the component obtained in S2) together. At this time, the first locking bolt 8 is simultaneously connected to the spline connection ring 6 and the second base 14 to obtain the test half shaft of mode three; S4. Slowly insert the assembled test half shaft into the differential sample. When the spline teeth 9 are aligned with the splines of the half shaft gear 86, slowly push and rotate the test half shaft until the single-shaft locking device 7 is in full contact with the single shaft 84; S5. Adjust the position of the tensioning cam 421 through an adjusting wrench to squeeze the tensioning thimble 422 until it is pressed against the differential housing, and finally fix it with the third locking bolt 12. This connection method can transmit a larger torque because the power is transmitted through two places, namely the differential housing 82 and the half shaft gear 86.

[0083] Mode four: Use a common tensioning ring 5 and a spline connection ring 6;

[0084] Assemble the connecting flange 1, the adjusting ring 2, the sealing ring 3, the common tensioning ring 5, and the spline connection ring 6 in sequence, and transmit power through the connection between the spline teeth 9 and the half shaft gear 86. The differential is in a free state, which is applicable to the test scenario of simultaneous driving of two outputs.

[0085] Specifically, the assembly process is as follows: S1. Assemble the spline teeth 9 and the spline connection ring 6 together with the locking screw 10. The number of spline teeth 9 can be made into multiple according to the torque transmission situation and distribution situation; S2. Connect the connecting flange 1, the adjusting ring 2, the sealing ring 3, and the common tensioning ring 5 together with the second locking bolt 11; S3. Fasten the parts assembled in S1 and S2 together with the third locking bolt 12 to obtain the test half shaft of mode four. When in use, slowly insert the two sets of assembled test half shafts into the differential sample at the same time to achieve simultaneous driving or differential driving on both sides of the differential sample.

[0086] The multi-functional combined half-shaft device in the above embodiments realizes the lossless power transmission of the differential through various assembly methods. There is no need to weld the differential, and the power transmission of the differential can be realized through the above four connection methods. Among them, the tensioning ring 4 realizes the radial movement of the tensioning thimble 422 through the combination of the cam method and the thread. The combination scheme of the spline connection ring 6 and the spline teeth 9 can flexibly adapt to different products. According to the power transmission requirements of the products, the number of spline teeth can be increased. The replaceable sealing ring 3 can be made in several specifications according to different products. The adjusting ring 2 can be made in several specifications. The existence of the adjusting ring 2 can better simulate the flange position of the actual half-shaft connection, making the connection state closer to the real product. In this embodiment, the multi-functional combination method and the modular scheme adopt the combination of bolt connection and spigot connection. Through the combination of multiple functional modules with different functions, it can meet the applications of various scenarios, basically covering all types of half-shaft products. It has low manufacturing cost, complete functions, and short manufacturing cycle, and can effectively solve the problems of long cycle, high cost in the trial production of the in-vehicle product shaft, and high cost of the conventional self-locking scheme of the differential, ensuring the development progress and quality of the product.

[0087] For the sake of convenience in description, spatial relative terms, such as "above", "on the top of", "on the upper surface of", "above-mentioned", etc., can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "on the top of other devices or structures" will be positioned as "below other devices or structures" or "beneath other devices or structures" afterwards. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used here will be made.

[0088] In addition to the above, it should also be noted that the "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in connection with that embodiment being included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in connection with any one embodiment, it is intended that the implementation of such feature, structure or characteristic in combination with other embodiments also falls within the scope of the present invention.

[0089] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0090] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A vehicle test device, characterized in that, Comprising: A test bench, the test bench includes a driving part, and the driving part has an output shaft; A multi-functional combined half shaft device, the first end of the multi-functional combined half shaft device is connected to the output shaft, and the multi-functional combined half shaft device can be selectively connected to at least one of a differential housing (82), a half shaft gear (86), and a spider shaft (84) of a differential; The multi-functional combined half shaft device includes: A connecting flange (1), the first end of the connecting flange (1) is connected to the output shaft; An adjusting ring (2), the adjusting ring (2) is arranged at the second end of the connecting flange (1), and there is at least one adjusting ring (2); A sealing ring (3), the sealing ring (3) is arranged close to the adjusting ring (2), and the adjusting ring (2) is arranged between the connecting flange (1) and the sealing ring (3); A tensioning ring (4), the tensioning ring (4) abuts against one end of the sealing ring (3); The tensioning ring (4) includes: A base (41), the base (41) is provided with a receiving cavity (410), the receiving cavity (410) extends along the axial direction of the base (41), and at least one opening groove structure (411) is provided on the outer peripheral surface of the base (41), and the opening groove structure (411) is communicatively arranged with the wall surface of the receiving cavity (410); A positioning component (42), at least part of the positioning component (42) is located in the receiving cavity (410), at least part of the positioning component (42) can extend to the outside of the base (41) through the opening groove structure (411), and the positioning component (42) is rotatably arranged in the receiving cavity (410) to adjust the length of the positioning component (42) extending to the outside of the base (41); The positioning component (42) has an initial position and a tensioning position. When the positioning component (42) is in the initial position, the positioning component (42) is arranged with a gap from the differential housing (82). When the positioning component (42) is in the tensioning position, the positioning component (42) abuts against the differential housing (82). Wherein, during the test, the outer ring of the sealing ring (3) abuts against the inner ring of the output oil seal (81) of the differential, and the outer peripheral surface of the tensioning ring (4) is arranged with a gap from the differential housing (82), or at least part of the tensioning ring (4) abuts against the differential housing (82).

2. The vehicle test device according to claim 1, wherein, The multi-functional combined half shaft device further includes: A spline connection ring (6), the spline connection ring (6) is arranged adjacent to the tensioning ring (4), and spline teeth (9) are arranged on the outer peripheral surface of the spline connection ring (6), and the spline teeth (9) are arranged to match the internal splines (83) of the half shaft gear of the differential.

3. The vehicle test device according to claim 1 or 2, characterized in that, The multi-functional combined half shaft device further includes: A spider shaft locking device (7), the spider shaft locking device (7) has a locking state for locking the spider shaft (84) of the differential and a releasing state for releasing the spider shaft (84) of the differential.

4. The vehicle test device according to claim 1, characterized in that, The accommodation cavity (410) includes a first cavity (4101) and a second cavity (4102). The first cavity (4101) extends along the axial direction of the base (41). The first cavity (4101) is used to accommodate at least part of the positioning component (42). The positioning component (42) is rotatably arranged in the first cavity (4101). The second cavity (4102) is opened on the cavity wall of the first cavity (4101). There are multiple second cavities (4102). The multiple second cavities (4102) are arranged at intervals along the circumferential direction of the first cavity (4101). The second cavity (4102) extends along the radial direction of the base (41). The opening groove structure (411) is communicatively arranged with the second cavity (4102). The positioning component (42) located in the second cavity (4102) is movably arranged along the radial direction of the base (41).

5. The vehicle test device according to claim 1, characterized in that, The positioning component (42) includes: A tensioning cam (421). The tensioning cam (421) is located in the accommodation cavity (410). The tensioning cam (421) is rotatably arranged in the accommodation cavity (410). A tensioning ejector pin (422). The tensioning ejector pin (422) is located in the accommodation cavity (410). At least part of the tensioning ejector pin (422) extends outside the base (41) through the opening groove structure (411). The tensioning ejector pin (422) is in contact with the outer peripheral surface of the tensioning cam (421). Driving the tensioning cam (421) to rotate circumferentially can drive the tensioning ejector pin (422) to move radially along the base (41) to adjust the length of the tensioning ejector pin (422) extending outside the base (41).

6. The vehicle test device according to claim 5, wherein The tensioning cam (421) includes: A cam body (4210). The outer peripheral surface of the cam body (4210) is provided with a plurality of guiding structures (4211). The plurality of guiding structures (4211) are arranged at a distance from each other. The guiding structure (4211) extends along the circumferential direction of the cam body (4210). The distance between the guiding structure (4211) and the central axis of the cam body (4210) changes gradually along the circumferential direction of the cam body (4210). The guiding structure (4211) abuts against at least part of the tensioning ejector pin (422). Rotating the cam body (4210) drives the tensioning ejector pin (422) to move along the circumferential direction of the guiding structure (4211) to adjust the length of the tensioning ejector pin (422) extending outside the base (41).

7. The vehicle test device according to claim 6, characterized in that The guiding structure (4211) includes two adjacent guiding surfaces (4212). Both of the two guiding surfaces (4212) are arc-shaped surfaces. The distance between the two guiding surfaces (4212) and the central axis of the cam body (4210) increases gradually along the direction in which the two adjacent guiding surfaces (4212) gradually move away from each other.

8. The vehicle test device according to claim 6 or 7, characterized in that, The tensioning ejector pin (422) includes: Ejector pin part (4221); Ejector pin base (4222), a first end of the ejector pin base (4222) is connected to the ejector pin part (4221), a second end of the ejector pin base (4222) is provided with an arc-shaped working surface (4223) that cooperates with the guiding structure (4211), the ejector pin base (4222) abuts against the guiding structure (4211) through the arc-shaped working surface (4223), and the tensioning cam (421) rotates to drive the ejector pin base (4222) to move circumferentially along the guiding structure (4211), thereby adjusting the length of the ejector pin part (4221) extending outside the base (41).

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