A connecting shaft for automobile motor test

Abstract

The utility model belongs to the automobile motor test technical field especially relates to a connecting shaft for automobile motor test, including connecting axle main part, both ends of connecting axle main part are equipped with the outer spline tooth for with automobile motor output end inner spline sleeve and test equipment input end inner spline sleeve cooperation, the outer spline tooth of both ends is equipped with the anti -loose component and automobile motor output end or test equipment input end connection, sets up anti -loose component through the outer spline tooth at both ends of connecting axle main part, utilizes the cooperation of docking portion and outer spline tooth and corresponding inner spline sleeve and forms multiple tooth engagement structure, can effectively prevent spline cooperation place loosening, guarantees the stability of power transmission, improves the accuracy of test data.

Description

Technical Field

[0001] This utility model relates to the field of automotive motor testing technology, specifically to a connecting shaft for automotive motor testing. Background Technology

[0002] During the production and R&D of automotive motors, comprehensive performance testing of the motors is required, including key parameters such as output torque, speed, and power. To perform this testing, a connecting shaft is used to connect the output of the automotive motor to the input of the testing equipment, ensuring a stable power transmission from the motor to the equipment.

[0003] Currently, most commonly used connecting shafts on the market employ spline connections to connect to the motor output and the testing equipment input. However, during prolonged testing, the spline connection is prone to loosening due to vibrations generated during motor operation and torque fluctuations during power transmission. This loosening not only leads to unstable power transmission and affects the accuracy of test data, but may also cause increased friction between the connecting shaft and the spline sleeve, resulting in component wear, shortening the equipment's lifespan, and even posing a risk of connection failure and safety accidents.

[0004] To address the issue of loose connections, some existing technologies employ the method of adding fasteners (such as bolts or pins) at the spline mating points for fixation. However, this method is cumbersome to operate, inconvenient to disassemble and assemble, and prone to damaging the spline structure after repeated disassembly and assembly. Other technologies enhance connection stability by improving the spline mating precision, but this significantly increases manufacturing costs and remains unsatisfactory in preventing loosening under high-frequency vibration conditions. Therefore, there is an urgent need for a simple, easy-to-disassemble, and reliable anti-loosening automotive motor test connection shaft. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a connecting shaft for testing automotive motors, which can effectively achieve a stable connection with the output end of the automotive motor and the input end of the testing equipment, prevent loosening, and is easy to assemble and disassemble, and is highly practical.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A connecting shaft for testing automotive motors includes a connecting shaft body, both ends of which are provided with external splines for engaging with an inner spline sleeve at the output end of the automotive motor and an inner spline sleeve at the input end of the testing equipment; both ends of the external splines are provided with anti-loosening components for connecting to the output end of the automotive motor or the input end of the testing equipment.

[0008] Preferably, the anti-loosening component includes an anti-loosening ring that is slidably fitted onto the main body of the connecting shaft, and the anti-loosening ring extends to the side opposite the external spline teeth with a mating portion; the external spline has a narrowing section at the position corresponding to the mating portion, and the narrowing section forms an annular groove for placing the mating portion between itself and the inner spline sleeve of the automotive motor output end or the inner spline sleeve of the test equipment input end; a first mating tooth is arranged around the narrowing section, a second mating tooth that matches the first mating tooth is arranged around the inner wall of the mating portion, and a third mating tooth that mates with the inner spline sleeve of the automotive motor output end or the inner spline sleeve of the test equipment input end is arranged around the outer wall of the mating portion; the third mating tooth of the mating portion has the same height as the external spline teeth.

[0009] Preferably, the anti-loosening ring includes an upper anti-loosening ring and a lower anti-loosening ring arranged symmetrically. When the two upper and lower anti-loosening rings are joined together, they form an anti-loosening ring, which can be slidably sleeved on the connecting shaft body.

[0010] Preferably, one side of the anti-loosening ring is connected to the external spline teeth, and the other side is provided with an annular retaining platform. The annular retaining platform is connected and fixed to the connecting shaft body to limit the position of the anti-loosening ring.

[0011] Preferably, a buffer assembly is provided between the annular locking platform and the anti-loosening ring. The buffer assembly includes a movable ring, a spring, and a telescopic column. The annular locking platform is provided with a sliding hole. One end of the telescopic column is connected and fixed to the movable ring, and the other end is slidably inserted into the sliding hole and is movably connected to the annular locking platform through an adjustment assembly. The spring is fitted on the telescopic column, and one end of the spring abuts against the movable ring, while the other end abuts against the annular locking platform.

[0012] Preferably, the adjusting component includes an adjusting nut, and the end of the telescopic column relative to the movable ring is provided with an adjusting thread section. The adjusting nut and the adjusting thread section of the telescopic column cooperate with each other to adjust the position of the telescopic column.

[0013] Preferably, both ends of the upper and lower anti-loosening rings are provided with connecting ears, and threaded holes are provided through the connecting ears. When the upper and lower anti-loosening rings are assembled, the threaded holes of the corresponding connecting ears are coaxially aligned, and the upper and lower anti-loosening rings are fixed by screw fasteners to form an anti-loosening ring.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting anti-loosening components at the external spline teeth at both ends of the connecting shaft body, and utilizing the cooperation of the mating part with the external spline teeth and the corresponding internal spline sleeve to form a multi-tooth meshing structure, it can effectively prevent loosening at the spline joint, ensure the stability of power transmission, and improve the accuracy of test data; at the same time, the anti-loosening ring adopts a detachable upper and lower anti-loosening ring structure, and is fixed by connecting ears and screw fasteners, which is convenient for disassembly and assembly, and can be completed without disassembling the entire connecting shaft, reducing maintenance difficulty; the setting of the annular clamp can play an axial limiting role for the anti-loosening ring, ensuring that the anti-loosening component is always in an effective working position; the addition of the buffer component can absorb the vibration during motor operation, reduce the wear of parts, extend the service life of equipment, improve the accuracy of test data, and the buffering effect can be flexibly adjusted by adjusting the component, making it highly applicable. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the anti-loosening ring in this utility model.

[0018] In the figure, 1. Connecting shaft body, 2. External spline teeth, 21. Narrowing section, 211. First mating tooth; 3. Anti-loosening component, 31. Anti-loosening ring, 311. Upper anti-loosening ring, 312. Lower anti-loosening ring, 313. Connecting lug, 314. Threaded hole; 32. Mating part, 321. Second mating tooth, 322. Third mating tooth; 4. Inner spline sleeve, 5. Annular groove, 6. Annular retaining plate, 7. Buffer component, 71. Movable ring, 72. Spring, 73. Telescopic column, 731. Adjusting threaded section, 74. Adjusting nut. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] It should be noted that when a component / part is referred to as being "set on" another component / part, it can be directly set on the other component / part or there may be an intervening component / part. When a component / part is referred to as being "connected / linked" to another component / part, it can be directly connected / linked to the other component / part or there may be an intervening component / part. The term "connected / linked" as used herein can include electrical and / or mechanical physical connections / links. The term "including / comprises" as used herein means the presence of a feature, step, or component / part, but does not exclude the presence or addition of one or more other features, steps, or components / parts. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Please see Figure 1 The diagram shows a connecting shaft for testing an automotive motor, comprising a connecting shaft body 1. Both ends of the connecting shaft body 1 are provided with external spline teeth 2 (represented by dashed lines in the diagram) for engaging with the inner spline sleeve 4 at the output end of the automotive motor and the inner spline sleeve 4 at the input end of the testing equipment. Both ends of the external spline teeth 2 are provided with anti-loosening components 3 for connecting to the output end of the automotive motor or the input end of the testing equipment.

[0022] like Figure 1 and 2As shown, the anti-loosening component 3 includes an anti-loosening ring 31 that is slidably fitted onto the connecting shaft body 1. The anti-loosening ring 31 extends to the side facing the outer spline tooth 2 and has a mating portion 32. The outer spline has a narrowing section 21 at the position corresponding to the mating portion 32. The narrowing section 21 forms an annular groove 5 between itself and the inner spline sleeve 4 at the output end of the automotive motor or the inner spline sleeve 4 at the input end of the testing equipment for placing the mating portion 32. A first mating tooth 211 (represented by a dashed line in the figure) is provided around the narrowing section 21. The inner part of the mating portion 32... The outer wall of the mating part 32 is provided with a second mating tooth 321 that matches the first mating tooth 211 (the tooth segment is indicated by a dashed line in the figure). The outer wall of the mating part 32 is provided with a third mating tooth 322 that mates with the inner spline sleeve 4 at the output end of the automobile motor or the inner spline sleeve 4 at the input end of the test equipment. The third mating tooth 322 of the mating part 32 is at the same height as the outer spline tooth 2, ensuring that after the mating part 32 is embedded in the annular groove 5, the third mating tooth 322 can fully mesh with the inner spline sleeve 4. By setting a narrowing section 21, an annular groove 5 is formed between the narrowing section 21 and the inner spline sleeve 4. When the mating part 32 of the anti-loosening ring 31 is embedded in the annular groove 5, the second mating tooth 321 on the inner wall of the mating part 32 meshes with the first mating tooth 211 of the narrowing section 21. At the same time, the third mating tooth 322 on the outer wall of the mating part 32 meshes with the inner spline sleeve 4, and the third mating tooth 322 is at the same height as the outer spline tooth 2. This enables the anti-loosening ring 31 to achieve double meshing positioning with the connecting shaft body 1 and the inner spline sleeve 4, significantly enhancing the stability of the connection and effectively preventing loosening at the spline mating point.

[0023] like Figure 3 As shown, the anti-loosening ring 31 includes an upper anti-loosening ring 311 and a lower anti-loosening ring 312 symmetrically arranged. When the two upper anti-loosening rings 311 and the lower anti-loosening ring 312 are assembled, they form the anti-loosening ring 31. A small gap is left between the inner wall of the assembled anti-loosening ring 31 and the outer wall of the connecting shaft body 1, so that it can slide along the axial direction of the connecting shaft body 1 for easy installation and to cooperate with the buffer mechanism. The anti-loosening ring 31 is designed as a detachable upper anti-loosening ring 311 and lower anti-loosening ring 312 structure, which can complete the installation and removal of the anti-loosening ring 31 without disassembling the entire connecting shaft from the equipment, greatly improving the convenience of disassembly and assembly and reducing the difficulty of operation.

[0024] like Figure 1 and Figure 2 As shown, one side of the anti-loosening ring 31 is connected to the external spline tooth 2, and the other side is provided with an annular retaining platform 6. The annular retaining platform 6 is connected and fixed to the connecting shaft body 1. The annular retaining platform 6 and the connecting shaft body 1 are integrally set and used to limit the position of the anti-loosening ring 31. The annular retaining platform 6 can axially limit the anti-loosening ring 31, prevent the anti-loosening ring 31 from sliding along the axial direction of the connecting shaft body 1 during use, ensure that the anti-loosening component 3 is always in an effective working position, and ensure the stability of the anti-loosening effect.

[0025] like Figure 2 As shown, a buffer assembly 7 is provided between the annular locking platform 6 and the anti-loosening ring 31. The buffer assembly 7 includes a movable ring 71 and a spring 72. Figure 1 The spring 72 is concealed for easy observation of the telescopic column 73. The annular mounting platform 6 has a sliding hole. One end of the telescopic column 73 is fixedly connected to the movable ring 71, and the other end slides through the sliding hole and is movably connected to the annular mounting platform 6 through an adjustment component. Specifically, the annular mounting platform 6 has four sliding holes evenly distributed around its circumference, and a telescopic column 73 slides through each sliding hole. The spring 72 is fitted onto the telescopic column 73, with one end of the spring 72 abutting against the movable ring 71 and the other end abutting against the annular mounting platform 6. After the anti-loosening ring 31 is installed, one side of the movable ring 71 is always kept against the anti-loosening ring 31 by the elasticity of the spring 72, and the spring 72 pushes the anti-loosening ring 31 in the direction of connecting with the corresponding inner spline sleeve 4 to further prevent loosening; at the same time, the buffer assembly 7 can effectively absorb the vibration generated during the operation of the motor, and the elastic deformation of the spring 72 buffers the axial impact force on the anti-loosening ring 31, avoiding damage caused by rigid collision between the anti-loosening ring 31 and the annular clamp 6, while further enhancing the overall vibration resistance of the connecting shaft and improving the connection stability.

[0026] like Figure 1 and Figure 2 As shown, the adjustment assembly includes an adjusting nut 74. The telescopic column 73 has an adjusting threaded section at one end relative to the movable ring 71. The adjusting nut 74 and the adjusting threaded section of the telescopic column 73 cooperate to adjust the position of the telescopic column 73. By rotating the adjusting nut 74, the telescopic column 73 can slide along the sliding hole, thereby adjusting the distance between the movable ring 71 and the annular clamping platform 6, thus adjusting the preload of the spring 72. This allows for flexible adjustment of the buffering effect according to the vibration intensity under different test scenarios, making it more versatile.

[0027] like Figure 3 As shown, both ends of the upper anti-loosening ring 311 and the lower anti-loosening ring 312 are provided with connecting ears 313. A threaded hole 314 is provided through the connecting ear 313. When the upper anti-loosening ring 311 and the lower anti-loosening ring 312 are assembled, the threaded holes 314 of the corresponding connecting ears 313 are coaxially aligned, and the upper anti-loosening ring 311 and the lower anti-loosening ring 312 are fixed together by screw fasteners to form an anti-loosening ring 31. Through the cooperation of the connecting ears 313 and the screw fasteners, the upper anti-loosening ring 311 and the lower anti-loosening ring 312 can be quickly assembled and fixed, ensuring reliable connection and facilitating disassembly and maintenance.

[0028] The usage process of this embodiment is as follows:

[0029] Insert the external spline tooth 2 at one end of the connecting shaft body 1 into the internal spline sleeve 4 at the output end of the automobile motor to achieve initial engagement between the two.

[0030] The upper half anti-loosening ring 311 and the lower half anti-loosening ring 312 are respectively inserted from both sides of the connecting shaft body 1, so that the mating part 32 is aligned with the annular groove 5 formed by the narrow section 21 and the inner spline sleeve 4. Then, the upper half anti-loosening ring 311 and the lower half anti-loosening ring 312 are fixed by screw fasteners. At this time, the mating part 32 is embedded in the annular groove 5, the second mating tooth 321 meshes with the first mating tooth 211, and the third mating tooth 322 meshes with the inner spline sleeve 4.

[0031] And the anti-loosening ring 31 is pushed toward the direction of connection with the corresponding inner spline sleeve 4 by the movable ring 71 and spring 72 of the buffer assembly 7;

[0032] Following the steps above, mate the external spline 2 at the other end of the connecting shaft body 1 with the internal spline sleeve 4 at the input end of the test equipment, and install the corresponding anti-loosening component 3.

[0033] According to the test requirements, the position of the telescopic column 73 is adjusted by rotating the adjusting nut 74, thereby adjusting the preload of the spring 72 to achieve the ideal buffering effect;

[0034] The motor is started for testing. During the test, the anti-loosening component 3 can effectively prevent the connecting shaft from loosening with the inner spline sleeve 4, while the buffer component 7 can absorb vibration and ensure stable power transmission, thereby avoiding the impact of vibration on the test values ​​and improving the accuracy of the test data.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A connecting shaft for testing automotive motors, characterized in that, The device includes a connecting shaft body (1), both ends of which are provided with external spline teeth (2) for engaging with the inner spline sleeve (4) at the output end of the automotive motor and the inner spline sleeve (4) at the input end of the test equipment; both ends of the external spline teeth (2) are provided with anti-loosening components (3) for connecting with the output end of the automotive motor or the input end of the test equipment. The anti-loosening component (3) includes an anti-loosening ring (31) that is slidably fitted on the connecting shaft body (1). The anti-loosening ring (31) extends to one side of the outer spline tooth (2) and has a mating part (32). The outer spline tooth (2) has a narrowing section (21) corresponding to the position of the mating part (32). The narrowing section (21) forms an annular groove (5) for placing the mating part (32) between the inner spline sleeve (4) of the output end of the automobile motor or the inner spline sleeve (4) of the input end of the test equipment. A first mating tooth (211) is provided around the narrowing section (21). A second mating tooth (321) matching the first mating tooth (211) is provided around the inner wall of the mating part (32). A third mating tooth (322) cooperating with the inner spline sleeve (4) of the output end of the automobile motor or the inner spline sleeve (4) of the input end of the test equipment is provided around the outer wall of the mating part (32). The third mating tooth (322) of the mating part (32) is at the same height as the outer spline tooth (2).

2. The connecting shaft for automotive motor testing according to claim 1, characterized in that, The anti-loosening ring (31) includes an upper anti-loosening ring (311) and a lower anti-loosening ring (312) arranged symmetrically. When the upper anti-loosening ring (311) and the lower anti-loosening ring (312) are assembled, they form an anti-loosening ring (31) and can be slidably sleeved on the connecting shaft body (1).

3. The connecting shaft for automotive motor testing according to claim 1 or 2, characterized in that, One side of the anti-loosening ring (31) is connected to the external spline tooth (2), and the other side is provided with an annular retaining plate (6). The annular retaining plate (6) is connected and fixed to the connecting shaft body (1) to limit the position of the anti-loosening ring (31).

4. The connecting shaft for automotive motor testing according to claim 3, characterized in that, A buffer assembly (7) is provided between the annular locking platform (6) and the anti-loosening ring (31). The buffer assembly (7) includes a movable ring (71), a spring (72), and a telescopic column (73). The annular locking platform (6) is provided with a sliding hole (61). One end of the telescopic column (73) is connected and fixed to the movable ring (71), and the other end is slidably inserted into the sliding hole (61) and is movably connected to the annular locking platform (6) through an adjustment assembly. The spring (72) is fitted on the telescopic column (73), and one end of the spring (72) abuts against the movable ring (71), and the other end abuts against the annular locking platform (6).

5. The connecting shaft for automotive motor testing according to claim 4, characterized in that, The adjustment assembly includes an adjustment nut (74), and the telescopic column (73) has an adjustment thread section (731) at one end relative to the movable ring (71). The adjustment nut (74) and the adjustment thread section (731) of the telescopic column (73) cooperate with each other to adjust the position of the telescopic column (73).

6. The connecting shaft for automotive motor testing according to claim 2, characterized in that, Both ends of the upper half anti-loosening ring (311) and the lower half anti-loosening ring (312) are provided with connecting ears (313). The connecting ears (313) are provided with threaded holes (314). When the upper half anti-loosening ring (311) and the lower half anti-loosening ring (312) are assembled, the threaded holes (314) of the corresponding connecting ears (313) are coaxially aligned, and the upper half anti-loosening ring (311) and the lower half anti-loosening ring (312) are fixed by screw fasteners to form an anti-loosening ring (31).

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