New energy automobile powder metallurgy transmission shaft torsion impact test bench

Abstract

The application discloses a new energy automobile powder metallurgy transmission shaft torsion impact test bench, which comprises a bottom plate, a rack, a traction mechanism, an impact hammer and a torque testing device, the traction mechanism is fixedly installed on the bottom plate and the rack, the impact hammer is slidably arranged in the interior of the rack, and the torque testing device is fixedly connected to the right side of the top of the bottom plate, and the application relates to the technical field of mechanical property testing. The new energy automobile powder metallurgy transmission shaft torsion impact test bench connects the pull rope and the impact hammer by the mode that the clamping block clamps the hook block, so that the pull rope and the impact hammer can be quickly separated, and then the impact hammer is not affected by the resistance of the motor output shaft rotation when falling, the impact force of the impact hammer is easier to measure, errors are not prone to occur, and the clamping block is matched with the triangular block, the pull rope pulls the impact hammer to the top, the triangular block pushes the clamping block to the two sides after pushing away the clamping block, and the release of the impact hammer can be automatically realized, and an electric grabbing release structure is not needed, so that the cost is low.

Description

Technical Field

[0001] This invention relates to the field of mechanical performance testing technology, specifically to a torsional impact test bench for powder metallurgy drive shafts in new energy vehicles. Background Technology

[0002] The driveshaft is a high-speed, low-support rotating body, making its dynamic balance crucial. Driveshafts typically undergo dynamic balancing tests and adjustments on a balancing machine before leaving the factory. In front-engine, rear-wheel-drive vehicles, the driveshaft transmits the rotation of the transmission to the final drive. It can consist of several sections connected by universal joints. The driveshaft is a vital component in the automotive drivetrain, working with the gearbox and drive axle to transmit engine power to the wheels, thus generating driving force for the vehicle.

[0003] Existing drive shaft torsional impact testing devices typically use a motor-driven winch mechanism to suspend an impact hammer from a height, causing it to fall and impact an extended arm fixed to the end of the drive shaft, thereby generating torque that is applied to the drive shaft. This method has the following two problems:

[0004] 1. The hoisting cable of the motor winch mechanism is directly fixed to the impact hammer. When the impact hammer falls, it will drive the motor drive shaft to reverse, which will generate resistance and affect the measurement of the impact force of the falling impact hammer. If an electric gripping device is used to grip the impact hammer, the cost will be high.

[0005] 2. Even if the extended arm is made of high-strength metal, it will still produce slight deformation and elastic buffering force when subjected to a large impact, which will affect the transmission of impact force. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a torsional impact test bench for powder metallurgy drive shafts in new energy vehicles, thus solving the problem.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a torsional impact test bench for powder metallurgy drive shafts of new energy vehicles, comprising a base plate, a frame, a traction mechanism, an impact hammer, and a torque testing device. The traction mechanism is fixedly installed on the base plate and the frame, the impact hammer is slidably disposed inside the frame, and the torque testing device is fixedly connected to the right side of the top of the base plate.

[0008] The frame includes a vertical plate fixedly connected to the rear side of the bottom of the base plate, a top plate fixedly connected to the top of the vertical plate, and support columns fixedly connected to the left and right front corners between the top plate and the base plate.

[0009] The traction mechanism includes a motor, a locking device, and a first bearing seat, which are fixedly connected to the top of the base plate from back to front. A winch is fixedly connected to the surface of the motor output shaft and between the locking device and the first bearing seat. A pull rope is fixedly connected to the surface of the winch. One end of the pull rope passes through the top plate and is fixedly connected to a hook block, which extends into the interior of the impact hammer.

[0010] The impact hammer has sliding blocks inside its top and on both sides of the hook block. The internal locking blocks of the impact hammer have grooves that match the locking blocks. The left and right sides of the inner surface of the grooves are fixedly connected to the sides of the locking blocks. The top of the locking blocks extends above the impact hammer. Triangular blocks are fixedly connected to the top of the top plate and on both sides of the pull rope. The top of the locking blocks has a slope that matches the bottom slope of the triangular blocks.

[0011] Preferably, the traction mechanism further includes a pulley block fixedly connected to the top of the top plate, and the surface of the pull rope is slidably connected to the surface of the pulley block. The locking device is sleeved on the outside of the motor output shaft, and the front end of the motor output shaft is rotatably connected to the first bearing seat.

[0012] Preferably, the torque testing device includes a second bearing seat fixedly connected to the top of the base plate, and a missing gear is rotatably connected inside the second bearing seat. Reinforcing bushings that are rotatably connected to the bearing inside the second bearing seat are fixedly connected to both the front and rear sides of the missing gear, and a handle is fixedly connected to the right side of the missing gear.

[0013] Preferably, a pressure-bearing support mechanism is movably arranged on the top of the base plate and inside the frame. The pressure-bearing support mechanism includes a positioning plate fixedly connected to the top of the base plate by bolts, and a central shaft is fixedly connected to the center of the top of the positioning plate. A pressure-bearing seat is slidably sleeved on the outside of the central shaft. A toothed plate that meshes with the left convex tooth of the missing gear is fixedly connected to the right side of the pressure-bearing seat. A buffer rubber pad is fixedly connected to the top of the positioning plate.

[0014] Preferably, cylinders are fixedly connected to both the front and rear sides of the top of the positioning plate, and a square groove is opened on the top of the pressure seat. A bracket is fixedly connected between the tops of the two cylinders and inside the square groove.

[0015] Preferably, a start / stop button is fixedly connected to the front side of the top of the positioning plate, and a pressure sensor that contacts the surface of the pressure seat is fixedly connected to the back side of the front cylinder, and the pressure sensor and the start / stop button are electrically connected by a wire.

[0016] Preferably, a shaft hole is provided at the bottom of the rear side of the vertical plate, and a drive shaft mounting seat coaxial with the shaft hole is fixedly connected to the top of the base plate and located at the rear side of the vertical plate.

[0017] Preferably, the base plate and both sides of the frame are fitted with soundproof protective covers, and the bottom of both sides of the soundproof protective covers are rotatably connected with rollers.

[0018] Beneficial effects

[0019] This invention provides a torsional impact testing bench for powder metallurgy drive shafts in new energy vehicles. Compared with existing technologies, it has the following advantages:

[0020] (1) The torsional impact test bench for the powder metallurgy drive shaft of the new energy vehicle has a winch fixedly connected to the surface of the motor output shaft between the locking device and the first bearing seat. A pull rope is fixedly connected to the surface of the winch. One end of the pull rope passes through the top plate and is fixedly connected to a hook block, which extends into the interior of the impact hammer. Inside the top of the impact hammer, on both sides of the hook block, there are sliding blocks. The internal locking blocks of the top of the impact hammer have grooves that match the locking blocks. Return springs are fixedly connected between the left and right sides of the inner surface of the grooves and the sides of the locking blocks. The top of the locking blocks extends above the impact hammer. Triangular blocks are fixedly connected to the top of the device and to both sides of the pull rope. The top of the locking block has an inclined surface that matches the bottom inclined surface of the triangular block. The pull rope and the impact hammer are connected by locking the hook block, which allows the pull rope and the impact hammer to be separated quickly. As a result, when the impact hammer falls, it is not affected by the resistance of the motor output shaft rotation, making it easier to measure the impact force of the impact hammer and reducing the possibility of errors. In addition, the locking block and the triangular block cooperate to automatically release the impact hammer after the pull rope pulls the impact hammer to the top and the triangular block pushes the locking block to both sides. There is no need to use an electric gripping and release structure, which is low in cost and easy to use.

[0021] (2) The torsional impact test bench for the powder metallurgy drive shaft of the new energy vehicle includes a second bearing seat fixedly connected to the top of the base plate in the torque testing device. The second bearing seat is rotatably connected to a missing gear. The front and rear sides of the missing gear are fixedly connected to reinforcing bushings that are rotatably connected to the bearing inside the second bearing seat. A handle is fixedly connected to the right side of the missing gear. A pressure support mechanism is movably set on the top of the base plate and inside the frame. The pressure support mechanism includes a positioning plate fixedly connected to the top of the base plate by bolts. A central shaft is fixedly connected to the center of the top of the positioning plate. A pressure seat is slidably fitted on the outside of the central shaft. A toothed plate that meshes with the left convex tooth of the missing gear is fixedly connected to the right side of the pressure seat. A buffer pad is fixedly connected to the top of the positioning plate. Through the principle of gear and rack transmission, the impact force borne by the pressure seat is transferred to the missing gear and indirectly transmitted to the drive shaft. This replaces the existing extended arm that applies torque to the drive shaft, which can eliminate the error caused by the deformation and elasticity of the extended arm. The pressure support mechanism can be moved at any time, which is convenient for impact testing and easy to use.

[0022] (3) The torsional impact test bench for the powder metallurgy drive shaft of the new energy vehicle has cylinders fixedly connected to both the front and rear sides of the top of the positioning plate. The top of the pressure seat has a square groove. A bracket is fixedly connected between the tops of the two cylinders and inside the square groove. A start / stop button is fixedly connected to the front side of the top of the positioning plate. A pressure sensor that contacts the surface of the pressure seat is fixedly connected to the back of the front cylinder. The pressure sensor and the start / stop button are electrically connected by wires. The vibration generated by the impact hammer hitting the pressure seat can trigger the pressure sensor, thereby instantly starting the cylinder to lift the bracket and lift the impact hammer. This can prevent the impact hammer from rebounding and falling again, which would cause impact force on the drive shaft and affect the test data, thus ensuring the accuracy of the test data.

[0023] (4) The torsional impact test bench for powder metallurgy transmission shaft of new energy vehicle has a shaft hole at the bottom of the rear side of the vertical plate, and a transmission shaft mounting seat coaxial with the shaft hole is fixedly connected to the top of the base plate and the rear side of the vertical plate. The transmission shaft can be inserted into the shaft hole and the transmission shaft mounting seat, and then the impact hammer can be used to conduct a compressive impact test on the transmission shaft. By adding a simple structure to the original torque impact test device, another mechanical property can be tested, which is more practical.

[0024] (5) The new energy vehicle powder metallurgy drive shaft torsional impact test bench is equipped with soundproof protective covers on both sides of the base plate and the outside of the frame. Rollers are rotatably connected to the bottom of both sides of the soundproof protective cover. By setting the soundproof protective cover to cover the bottom of the equipment, the noise generated by the impact can be reduced, and the flying fragments that accidentally break during the impact can be avoided from causing injury to people. The soundproof protective cover can be pushed directly, which is practical and convenient. Attached Figure Description

[0025] Figure 1 This is a front view of the structure of the present invention;

[0026] Figure 2 This is a front view of the torque impact detection state of the present invention;

[0027] Figure 3 This is a front view of the bending impact testing state of the present invention;

[0028] Figure 4 This is a partial cross-sectional view of the impact hammer of the present invention;

[0029] Figure 5 This is a right view of a partial structure of the frame and the soundproof protective cover of the present invention;

[0030] Figure 6 This is a schematic diagram showing the connection between the torque testing device and the pressure-bearing support mechanism of the present invention;

[0031] Figure 7 This is a side sectional view of the pressure-bearing support mechanism of the present invention.

[0032] In the diagram: 1. Base plate; 2. Frame; 21. Vertical plate; 22. Top plate; 23. Support column; 24. Triangular block; 25. Shaft hole; 26. Drive shaft mounting seat; 3. Traction mechanism; 31. Motor; 32. Locking device; 33. First bearing seat; 34. Winch; 35. Pull rope; 36. Hook block; 37. Pulley block; 4. Impact hammer; 41. Clamping block; 42. Slide groove; 43. Return spring; 5. Torque testing device; 51. Second bearing seat; 52. Gear missing; 53. Reinforced bushing; 54. Handle; 6. Pressure bearing support mechanism; 61. Positioning plate; 62. Central shaft; 63. Pressure bearing seat; 64. Gear plate; 65. Buffer pad; 66. Cylinder; 67. Square groove; 68. Bracket; 69. Start / stop button; 610. Pressure sensor; 7. Soundproof protective cover; 8. Roller. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1-7 This invention provides a technical solution: a torsional impact test bench for powder metallurgy drive shafts in new energy vehicles, comprising a base plate 1, a frame 2, a traction mechanism 3, an impact hammer 4, and a torque testing device 5. The traction mechanism 3 is fixedly installed on the base plate 1 and the frame 2. The impact hammer 4 is slidably disposed inside the frame 2. The torque testing device 5 is fixedly connected to the right side of the top of the base plate 1. Soundproof protective covers 7 are fitted on both sides of the base plate 1 and the frame 2. Rollers 8 are rotatably connected to the bottom of both sides of the soundproof protective covers 7. By setting the soundproof protective covers 7 to cover the bottom of the equipment for testing, the noise generated by the impact can be reduced, and the flying fragments that accidentally break during the impact can be prevented from causing injury to people. The soundproof protective covers 7 can be directly pushed, making them practical and convenient.

[0035] The frame 2 includes a vertical plate 21 fixedly connected to the rear side of the bottom of the base plate 1. A top plate 22 is fixedly connected to the top of the vertical plate 21, and support columns 23 are fixedly connected to the left and right front corners of the top plate 22 and the base plate 1. A shaft hole 25 is opened at the bottom of the rear side of the vertical plate 21. A drive shaft mounting seat 26 coaxial with the shaft hole 25 is fixedly connected to the top of the base plate 1 and located at the rear side of the vertical plate 21. The right side of the drive shaft mounting seat 26 extends to the rear side of the torque testing device 5. Holes are provided on both the left and right sides of the drive shaft mounting seat 26, and a locking structure is provided to lock the drive shaft. The drive shaft can be inserted into the shaft hole 25 and the drive shaft mounting seat 26, and the impact hammer 4 can be used to perform a pressure impact test on the drive shaft. By adding a simple structure to the original torque impact test device, another mechanical property can be tested, making it more practical.

[0036] The traction mechanism 3 includes a motor 31, a locking device 32, and a first bearing seat 33, which are fixedly connected to the top of the base plate 1 from back to front. A winch 34 is fixedly connected to the surface of the output shaft of the motor 31 and between the locking device 32 and the first bearing seat 33. A pull rope 35 is fixedly connected to the surface of the winch 34. One end of the pull rope 35 passes through the top plate 22 and is fixedly connected to a hook block 36, which extends into the interior of the impact hammer 4. The traction mechanism 3 also includes a pulley group 37 fixedly connected to the top of the top plate 22. The surface of the pull rope 35 is slidably connected to the surface of the pulley group 37. The locking device 32 is sleeved on the outside of the output shaft of the motor 31. The front end of the output shaft of the motor 31 is rotatably connected to the first bearing seat 33.

[0037] Inside the top of the impact hammer 4, on both sides of the top of the hook block 36, there are sliding blocks 41. The internal blocks 41 of the impact hammer 4 have grooves 42 that fit the blocks 41. Return springs 43 are fixedly connected to the sides of the inner surfaces of the grooves 42 and the blocks 41. The top of the blocks 41 extends above the impact hammer 4. Triangular blocks 24 are fixedly connected to the top of the top plate 22 on both sides of the pull rope 35. The top of the blocks 41 has a slope that fits the bottom slope of the triangular blocks 24. The pull rope 35 is connected to the impact hammer 4 by locking the hook block 36 with the locking block 41, so that the pull rope 35 and the impact hammer 4 can be quickly separated. Therefore, when the impact hammer 4 falls, it is not affected by the resistance of the rotation of the output shaft of the motor 31, making it easier to measure the impact force of the impact hammer 4 and reducing the possibility of errors. In addition, the locking block 41 is set to cooperate with the triangular block 24. When the pull rope 35 pulls the impact hammer 4 to the top, the triangular block 24 pushes the locking block 41 to both sides, which can automatically release the impact hammer 4. There is no need to use an electric gripping and release structure, which is low in cost and easy to use.

[0038] The torque testing device 5 includes a second bearing seat 51 fixedly connected to the top of the base plate 1, and a missing gear 52 is rotatably connected inside the second bearing seat 51. The missing gear 52 has a 90-degree convex tooth on only one side. Both the front and rear sides of the missing gear 52 are fixedly connected to reinforcing bushings 53 that are rotatably connected to the bearing inside the second bearing seat 51. A handle 54 is fixedly connected to the right side of the missing gear 52 to facilitate the rotation of the missing gear 52.

[0039] A pressure-bearing support mechanism 6 is movably installed on the top of the base plate 1 and inside the frame 2. The pressure-bearing support mechanism 6 includes a positioning plate 61 fixedly connected to the top of the base plate 1 by bolts, and a central shaft 62 fixedly connected to the center of the top of the positioning plate 61. A pressure-bearing seat 63 is slidably sleeved on the outside of the central shaft 62. A toothed plate 64 that meshes with the left convex tooth of the missing gear 52 is fixedly connected to the right side of the pressure-bearing seat 63. A buffer pad 65 is fixedly connected to the top of the positioning plate 61. Through the principle of gear and rack transmission, the impact force borne by the pressure-bearing seat 63 is transferred to the missing gear 52 and indirectly transmitted to the drive shaft. This replaces the existing extended arm that applies torque to the drive shaft, eliminating the error caused by the deformation and elasticity of the extended arm. The pressure-bearing support mechanism 6 can be moved at any time, facilitating impact resistance testing and making it easy to use. Cylinders 66 are fixedly connected to both the front and rear sides of the top. A square groove 67 is opened on the top of the pressure seat 63. A bracket 68 is fixedly connected between the tops of the two cylinders 66 and inside the square groove 67. A start / stop button 69 is fixedly connected to the front side of the top of the positioning plate 61. A pressure sensor 610 is fixedly connected to the back of the front cylinder 66 and contacts the surface of the pressure seat 63. The pressure sensor 610 is a UM model pressure sensor. The pressure sensor 610 and the start / stop button 69 are electrically connected by wires. The vibration generated by the impact hammer 4 hitting the pressure seat 63 can trigger the pressure sensor 610, which in turn instantly starts the cylinder 66 to lift the bracket 68 and lift the impact hammer 4. This can prevent the impact hammer 4 from rebounding and falling again, which would cause impact force on the drive shaft and affect the test data, thus ensuring the accuracy of the test data.

[0040] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0041] During torque testing, the drive shaft is inserted from the rear end into the drive shaft mounting base 26 and the missing gear 52, and the drive shaft is locked with the drive shaft mounting base 26. Then, the hook block 36 is pressed into the top of the impact hammer 4, causing the hook block 36 to push the locking block 41 to both sides. When the hook block 36 moves to the bottom of the locking block 41, the return force of the return spring 43 can push the locking block 41 to the top of the hook block 36 and lock the hook block 36. Then, the motor 31 is started to drive the winch 34 to rotate slowly, winding up the pull rope 35. Then, the impact hammer 4 is pulled up, and the two soundproof protective covers 7 are pushed to the outside of the device and combined to cover the lower half of the device. When it is pulled to the top, the triangular block 24 pushes the locking block 41 to both sides, so that the locking block 41 is released from the hook block 36, thereby releasing the impact hammer 4, causing the impact hammer 4 to fall and hit the pressure seat 63. Then, the toothed plate 64 drives the missing gear 52 to rotate counterclockwise, thereby transmitting the torque to the drive shaft. The impact force can be calculated by combining the falling height with the gravity of the impact hammer 4.

[0042] When the impact hammer 4 strikes the pressure seat 63, the pressure seat 63 vibrates, triggering the pressure sensor 610, which in turn instantly starts the cylinder 66 to lift the bracket 68 and lift the impact hammer 4, preventing the impact hammer 4 from falling again (during installation, the start / stop button 69 can be pressed to disconnect the circuit of the pressure sensor 610 to avoid false triggering).

[0043] When conducting the compressive impact test, the pressure support mechanism 6 is removed, and then the drive shaft is inserted into the left hole of the drive shaft mounting seat 26 from the rear end until the front end passes through the shaft hole 25 and is inserted into the frame 2. Then, the traction mechanism 3 and the impact hammer 4 are operated in the same way as above, and the front end of the drive shaft is directly impacted by the impact hammer 4 to test the compressive impact performance.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A torsional impact test bench for powder metallurgy drive shafts in new energy vehicles, comprising a base plate, a frame, a traction mechanism, an impact hammer, and a torque testing device, characterized in that: The traction mechanism is fixedly installed on the base plate and frame, the impact hammer is slidably set inside the frame, and the torque testing device is fixedly connected to the right side of the top of the base plate; The frame includes a vertical plate fixedly connected to the rear side of the bottom of the base plate, a top plate fixedly connected to the top of the vertical plate, and support columns fixedly connected to the left and right front corners between the top plate and the base plate. The torque testing device includes a second bearing housing fixedly connected to the top of the base plate, and a missing gear is rotatably connected inside the second bearing housing. Reinforcing bushings that are rotatably connected to the bearing inside the second bearing housing are fixedly connected to both the front and rear sides of the missing gear. A pressure-bearing support mechanism is movably installed on the top of the base plate and inside the frame. The pressure-bearing support mechanism includes a positioning plate fixedly connected to the top of the base plate by bolts, and a central shaft is fixedly connected to the center of the top of the positioning plate. A pressure-bearing seat is slidably sleeved on the outside of the central shaft. A toothed plate that meshes with the left convex tooth of the missing gear is fixedly connected to the right side of the pressure-bearing seat. A shaft hole is provided at the bottom of the rear side of the vertical plate. A drive shaft mounting seat coaxial with the shaft hole is fixedly connected to the top of the base plate and the rear side of the vertical plate. During torque testing, the drive shaft is inserted into the drive shaft mounting seat and the missing gear from the rear end, and the drive shaft is locked with the drive shaft mounting seat. The traction mechanism includes a motor, a locking device and a first bearing seat, which are fixedly connected to the top of the base plate from back to front. A winch is fixedly connected to the surface of the motor output shaft and between the locking device and the first bearing seat. A pull rope is fixedly connected to the surface of the winch. One end of the pull rope passes through the top plate and is fixedly connected to a hook block, which extends into the interior of the impact hammer. Inside the top of the impact hammer and on both sides of the top of the hook block, there are sliding blocks. The internal blocks of the top of the impact hammer have grooves that match the blocks. The left and right sides of the inner surface of the grooves are fixedly connected to the sides of the blocks. The top of the blocks extends to the top of the impact hammer. Triangular blocks are fixedly connected to the top of the top plate and on both sides of the pull rope. The top of the blocks has a slope that matches the bottom slope of the triangular blocks.

2. The torsional impact test bench for powder metallurgy drive shafts of new energy vehicles according to claim 1, characterized in that: The traction mechanism also includes a pulley block fixedly connected to the top of the top plate, and the surface of the pull rope is slidably connected to the surface of the pulley block. The locking device is sleeved on the outside of the motor output shaft, and the front end of the motor output shaft is rotatably connected to the first bearing seat.

3. The torsional impact test bench for powder metallurgy drive shafts of new energy vehicles according to claim 1, characterized in that: The right side of the gearless part has a handle fixedly attached.

4. The torsional impact test bench for powder metallurgy drive shafts of new energy vehicles according to claim 1, characterized in that: A cushioning pad is fixedly connected to the top of the positioning plate.

5. The torsional impact test bench for powder metallurgy drive shafts of new energy vehicles according to claim 1, characterized in that: Cylinders are fixedly connected to both the front and rear sides of the top of the positioning plate. A square groove is opened on the top of the pressure seat. A bracket is fixedly connected between the tops of the two cylinders and inside the square groove.

6. The torsional impact test bench for powder metallurgy drive shafts of new energy vehicles according to claim 5, characterized in that: A start / stop button is fixedly connected to the front side of the top of the positioning plate, and a pressure sensor that contacts the surface of the pressure seat is fixedly connected to the back of the front cylinder. The pressure sensor and the start / stop button are electrically connected by wires.

7. The torsional impact test bench for powder metallurgy drive shafts of new energy vehicles according to claim 1, characterized in that: The base plate and both sides of the frame are fitted with soundproof protective covers, and the bottom of both sides of the soundproof protective covers are rotatably connected with rollers.

Images