Gearbox detection device

Abstract

The invention relates to the technical field of gearbox detection, and discloses a gearbox detection device, which comprises a test frame, the gearbox is mounted on the test frame; the testing and displaying device is used for testing and displaying the operation of the gearbox; and the driving machine is connected with the input end of the gearbox. According to the gearbox detection device, through cooperative connection of the connecting piece and the measuring and displaying device, output power of the gearbox can be converted into rotating wind power, then transverse sliding of the pressure piece is controlled through the action of airflow, and finally the running smoothness of the gearbox can be judged according to stable sliding of the pressure piece; and meanwhile, according to different gears of the gearbox, the running smoothness of the gearbox under different gears can be judged and tested, and whether the gearbox is blocked or not in the running process can be more intuitively displayed by utilizing pointer rotation of the measuring and displaying device, so that the smoothness detection of the gearbox is realized.

Description

Technical Field

[0001] This invention relates to the field of gearbox testing technology, specifically to a gearbox testing device. Background Technology

[0002] As a crucial power transmission component, gearboxes are widely used in automobiles and machine tools. Gearboxes are responsible for transmitting power and changing speed and torque; therefore, their performance directly affects the operational performance of automobiles and machine tools. Gearbox performance can be tested by measuring some basic parameters; however, the simplest and most effective method is to use a gearbox testing device. Generally, gearbox testing devices simulate the stress environment of the gearbox, obtain appropriate testing parameters under this simulated stress environment, and then determine the gearbox's performance through analysis of these parameters.

[0003] Currently, transmission testing involves time-consuming and labor-intensive installation, typically requiring multiple workers simultaneously. Even after installation, the transmission merely idles during testing, without applying any load, failing to simulate actual operating conditions. Furthermore, during transmission operation testing, it's impossible to assess the smoothness of operation, such as shifting gears or checking for jamming in individual gears. Relying on manual visual inspection cannot provide timely and effective judgment of the transmission's operating status, leading to distorted test data. Therefore, this paper proposes a transmission testing device to address these issues. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a transmission testing device that solves the problems of overly simplistic transmission testing, distorted data during testing, and inability to effectively test the smoothness of the transmission.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a gearbox testing device, comprising: a test frame; a gearbox, the gearbox being mounted on the test frame; a test and display device for testing and displaying the operation of the gearbox; a drive motor, the drive motor being connected to the input end of the gearbox, and the output end of the gearbox being connected to the test and display device via a connector; and a pressure device for simulating different loads.

[0006] The measuring and display device includes a wind shield, which is mounted on a test frame. A long groove is provided on the wind shield, and a pressure plate is slidably connected to the long groove. A pressure spring is connected to the side of the pressure plate, and the right end of the pressure spring is connected to the wind shield. The connecting piece converts the rotational power of the gearbox into wind power to drive the lateral movement of the pressure plate.

[0007] Preferably, a rack is fixedly connected to the pressure plate, a large gear meshes with the rack, a pointer is connected to the shaft of the large gear via a connecting rod, a display panel is connected to the side of the shroud, and the large gear is mounted on the shroud via a mounting bracket.

[0008] Preferably, the connector includes a sleeve that is inserted into the output end of the gearbox. An outer sleeve is slidably connected to the surface of the sleeve via a keyway. The outer sleeve is rotatably connected to the test frame. A compression spring is connected to the side of the sleeve, one end of which abuts against the outer sleeve. A blade is connected to the right side of the outer sleeve via a connecting rod. The blade is located inside the wind shield.

[0009] Preferably, a central rod is connected to the wind shield, a support rod is slidably connected to the surface of the central rod, a top rod is connected to one end of the support rod, a rack is connected to the other end of the support rod, the top rod abuts against the output end surface of the gearbox, a pinion is meshed on the surface of the rack, an arrow is connected to the pinion through a sleeve, and the pinion is rotatably connected to a large gear.

[0010] Preferably, the pressure device includes a pressure sleeve, four insert rods are slidably connected to the pressure sleeve, a telescopic spring is sleeved on the surface of each insert rod, a sliding frame is connected to the bottom of each insert rod, and an inclined groove is formed on the surface of the sliding frame. The pressure sleeve abuts against the surface of the insert sleeve.

[0011] Preferably, a rotating shaft is rotatably connected to the test frame, a spiral groove is formed on the surface of the rotating shaft, a sliding pin is slidably connected to the surface of the spiral groove, a sliding plate is connected to the sliding pin, a sliding pin is connected to the top of the sliding plate, the sliding pin is slidably connected to the inclined groove, and a transmission component is connected to one end of the rotating shaft.

[0012] Preferably, the transmission component includes a transmission gear, the surface of which meshes with a drive gear, the drive gear is mounted on an outer sleeve, and the transmission gear is connected to a rotating shaft.

[0013] Preferably, the pressure sleeve has a slot, and the outer sleeve can be engaged in the slot.

[0014] Preferably, the ratio of the number of teeth of the drive gear to the number of teeth of the transmission gear is 1:5, and both the drive gear and the transmission gear are located inside the wind shield.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a gearbox testing device, which has the following beneficial effects: 1. This transmission detection device, through the connection of a connector and a measuring and display device, can convert the output power of the transmission into rotating air force. Then, the movement of the airflow controls the lateral sliding of the pressure plate. Finally, the smoothness of the transmission operation can be judged based on the stability of the pressure plate sliding. At the same time, it can also judge and test the smoothness of the transmission operation in different gears. The rotation of the pointer of the measuring and display device can more intuitively show whether the transmission is stuck during operation, thus realizing the smoothness detection of the transmission.

[0016] 2. This transmission testing device, through its pressure device, can simulate different load pressures on the transmission, enabling it to undergo testing under cyclic operation of different loads. This simulates the actual operating environment of the transmission and provides accurate data parameters for transmission testing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a gearbox testing device proposed in this invention; Figure 2 This is a schematic diagram of the connecting component structure of a gearbox testing device proposed in this invention; Figure 3 This is a schematic diagram of the display device structure of a gearbox testing device proposed in this invention; Figure 4 This is a schematic diagram of the pressure device structure of a gearbox testing device proposed in this invention; Figure 5 This is a schematic diagram of the sliding frame connection structure of a gearbox testing device proposed in this invention; Figure 6 This is a schematic diagram of the connection structure between the push rod and the rack of a gearbox testing device proposed in this invention; Figure 7 This is a schematic diagram of the slot position structure of a gearbox testing device proposed in this invention.

[0018] In the diagram: 1. Test frame; 2. Gearbox; 3. Fan shroud; 4. Display device; 41. Pressure plate; 42. Slide bar; 43. Compression spring; 44. Large gear; 45. Display panel; 46. Pointer; 47. Top rod; 48. Center rod; 49. Rack; 50. Small gear; 5. Connector; 51. Sleeve; 52. Outer sleeve; 53. Compression spring; 54. Blade; 6. Pressure device; 61. Pressure sleeve; 62. Transmission gear; 63. Drive gear; 64. Spiral groove; 65. Slide plate; 66. Sliding pin; 67. Sliding frame; 68. Inclined groove; 69. Telescopic spring; 70. Slot; 71. Rotating shaft. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1-7 A gearbox testing device includes a test frame 1; a gearbox 2 mounted on the test frame 1; a test and display device 4 for testing and displaying the operation of the gearbox 2; a drive motor connected to the input end of the gearbox 2, and the output end of the gearbox 2 connected to the test and display device 4 via a connector 5; and a pressure device 6 for simulating different loads.

[0021] In this embodiment, the measuring and display device 4 includes a shroud 3, which is mounted on the test frame 1. A long slot is formed on the shroud 3, and a pressure plate 41 is slidably connected to the long slot. A pressure spring 43 is connected to the side of the pressure plate 41, and the right end of the pressure spring 43 is connected to the shroud 3. A connecting member 5 converts the rotational power of the gearbox 2 into wind power to drive the lateral movement of the pressure plate 41. The shroud 3 is a closed cavity structure with an opening on one side or an air inlet channel, forming an airflow space inside. A long slot is formed horizontally on the side wall or top of the shroud 3, penetrating the wall thickness and communicating with its interior. The pressure plate 41 is a sheet or plate-shaped component, its size matching the long slot, slidably fitted into the long slot, and able to slide freely in the slot in the lateral direction, usually horizontal. One side of the pressure plate 41, for example the left side, is exposed in the airflow channel inside the shroud 3, while the other side extends to the outside of the shroud or is connected to the transmission mechanism. The connecting member 5 transmits the rotational power of the gearbox 2 output shaft to the measuring and display device 4. The output end of connector 5 drives one or more blades 54 to rotate at high speed inside the shroud 3. As the blades 54 rotate, they agitate the air, generating directional airflow, such as axial or radial airflow, within a specific flow channel of the shroud 3. This airflow directly acts on the side of pressure plate 41 exposed inside the shroud, generating wind pressure thrust. When the gearbox 2 operates smoothly and the output speed is uniform, the airflow generated by the blades 54 is relatively stable, and the wind pressure thrust acting on pressure plate 41 and the rebound force of the pressure spring 43 reach a dynamic balance, allowing pressure plate 41 to maintain a relatively stable lateral position in the long slot. If the gearbox 2 experiences jamming, jerking, or instability, the speed of its output shaft will fluctuate or change abruptly. This fluctuation is transmitted to the blades 54 through connector 5, causing their rotational speed to become unstable, which in turn causes a momentary change in the intensity of the generated airflow. This change in airflow intensity directly causes fluctuations in the wind pressure thrust acting on pressure plate 41, disrupting the original force balance. Under the combined action of wind pressure thrust and spring force, pressure plate 41 will experience corresponding lateral sliding displacement or vibration within the long slot. By observing whether the sliding of the pressure plate 41 is smooth, without any vibration or sudden changes in position, the smoothness of the gearbox 2's operation can be intuitively judged. This transforms the difficult-to-observe rotational mechanical fluctuations into easily observable linear motion changes, achieving effective detection and visual display of the gearbox's smoothness of operation.

[0022] Furthermore, a toothed slide bar 42 is fixedly connected to the pressure plate 41, and a large gear 44 meshes with the slide bar 42. A pointer 46 is connected to the shaft of the large gear 44 via a connecting rod. A display panel 45 is connected to the side of the shroud 3, and the large gear 44 is mounted on the shroud 3 via a mounting bracket. When the gearbox 2 runs smoothly, the pressure plate 41 is in a stable position, the slide bar 42 does not move significantly, and the large gear 44 and pointer 46 are stationary or only slightly oscillating. The pointer 46 indicates a relatively stable position, such as the middle mark, on the display panel 45. Once the gearbox runs sluggishly or unevenly, fluctuations in the output speed will cause changes in the airflow thrust acting on the pressure plate 41, forcing the pressure plate 41 to slide laterally. The slide bar 42 then moves and drives the large gear 44 to rotate, which in turn causes the pointer 46 to deflect on the display panel 45. The swing amplitude, frequency, or deflection direction of pointer 46 directly reflects the sliding condition of pressure plate 41, thereby amplifying and converting the rotational instability inside the gearbox, which is difficult to observe directly, into a clear and easy-to-read swing indication of the pointer on the dial, enabling the tester to more intuitively and accurately judge the smoothness of the gearbox operation and the degree of fluctuation.

[0023] Furthermore, the connector includes a sleeve 51, which is inserted into the output end of the gearbox 2. An outer sleeve 52 is slidably connected to the surface of the sleeve 51 via a keyway. The outer sleeve 52 is rotatably connected to the test frame 1. A compression spring 53 is connected to the side of the sleeve 51, with one end of the spring abutting against the outer sleeve 52. A blade 54 is connected to the right side of the outer sleeve 52 via a connecting rod, and the blade 54 is located inside the shroud 3. The sleeve 51 is typically a cylindrical structure, with an inner hole or spline groove at one end that matches the shape of the output shaft of the gearbox 2, allowing it to be directly inserted into the output end of the gearbox 2 for synchronous power transmission. The outer surface of the sleeve 51 is machined with a keyway, such as a flat key or spline, allowing it to slide relative to one of the outer sleeves 52 via the keyway. This keyway connection ensures torque transmission between the sleeve 51 and the outer sleeve 52, while allowing the sleeve 51 to slide axially relative to the outer sleeve 52 within a certain range. When the gearbox needs to be installed for testing, the operator overcomes the elastic force of the compression spring 53 and pulls the insert 51 axially to the right, allowing its front end to extend sufficiently from the outer sleeve 52. It is then aligned and inserted into the output shaft of the gearbox 2. Upon release, the elastic force of the compression spring 53 pushes the insert 51 back to the left, ensuring a tight fit with the output shaft and forming a reliable torque transmission connection. When the gearbox 2 is running, its output shaft drives the insert 51 to rotate. Through a keyway connection, the rotation of the insert 51 is synchronously transmitted to the outer sleeve 52. The rotation of the outer sleeve 52 drives the blades 54 inside the shroud 3 to rotate synchronously at high speed via a connecting rod. As the blades 54 rotate, airflow is generated within the shroud 3. The intensity and stability of this airflow directly depend on the rotational speed of the blades 54, thus reflecting the smoothness of the gearbox output shaft's rotation. Finally, the airflow acts on the pressure plate 41 of the measuring and display device, achieving the detection function. The entire connector 5 enables the stable and reliable transmission and conversion of the rotational mechanical energy output by the gearbox 2 into wind energy for detection. At the same time, its plug-in and spring buffer design facilitates the installation and disassembly of the gearbox and allows for a certain degree of axial adaptability.

[0024] In addition, a central rod 48 is connected to the shroud 3. A support rod is slidably connected to the surface of the central rod 48. One end of the support rod is connected to a push rod 47, and the other end is connected to a rack 49. The push rod 47 abuts against the output end surface of the gearbox 2. A pinion 50 meshes with the surface of the rack 49. An arrow is connected to the pinion 50 via a sleeve. The pinion 50 is rotatably connected to a large gear 44. When the connector 5 is not connected to the gearbox output shaft, for example during an unloaded test, or even after connection, if there is significant radial runout or vibration in the output shaft of the gearbox 2, this vibration will be sensed by the push rod 47 in contact with it. The push rod 47 transmits the vibration displacement to the support rod, which drives the rack 49 to perform reciprocating linear micro-motion. The rack 49 drives the meshing pinion 50 to reciprocate. The rotation of the pinion 50 causes the arrow on it to swing. By observing the swing amplitude and frequency of the arrow, the vibration and runout of the gearbox output shaft during operation can be visually judged, providing an auxiliary visual indicator for evaluating the assembly quality, shaft balance, or wear condition of the gearbox 2.

[0025] In addition, the pressure device 6 includes a pressure sleeve 61, on which four insert rods are slidably connected. A telescopic spring 69 is fitted onto the surface of each insert rod, and a sliding frame 67 is connected to the bottom of each insert rod. A groove 68 is formed on the surface of the sliding frame 67, and the pressure sleeve 61 abuts against the surface of the insert sleeve 51. A rotating shaft 71 is rotatably connected to the test frame 1. A spiral groove 64 is formed on the surface of the rotating shaft 71, and a sliding pin is slidably connected to the surface of the spiral groove 64. A sliding plate 65 is connected to the sliding pin, and a sliding pin 66 is connected to the top of the sliding plate 65. The sliding pin 66 is slidably connected to the groove 68, and a transmission component is connected to one end of the rotating shaft 71. When the sliding frame 67 is subjected to an external driving force and moves up and down axially, the groove 68 on its surface forces the sliding pin 66 at the bottom of the mating insert rod to undergo radial displacement. Due to the inclination angle of the inclined groove 68, the axial movement of the sliding frame 67 is converted into the synchronous radial movement of the four insert rods. When the sliding frame 67 moves in a certain direction, such as upward, the inclined groove 68 pushes the insert rods to overcome the elastic force of the surface telescopic spring 69 and move radially outward away from the center of the pressure sleeve 61. This causes the clamping force of the insert rods on the inner sleeve 51 to decrease, thereby reducing the simulated load. When the sliding frame 67 moves in the opposite direction, such as downward, under the restoring force of the telescopic spring 69 or the reverse push of the inclined groove, the insert rods move radially inward toward the center of the pressure sleeve 61. This causes the clamping force of the insert rods on the inner sleeve 51 to increase, thereby increasing the simulated load. Furthermore, by controlling the sliding frame 67 to make periodic axial reciprocating motion through the helical groove 64, the pressure sleeve 61 can apply a periodically varying and cyclically alternating radial frictional resistance to the rotating sleeve 51 through the four insert rods. This changing frictional resistance constitutes a simulated load on the output end of gearbox 2, used to test the smoothness and stability of gearbox operation under different load conditions, and to more realistically simulate actual working conditions.

[0026] It is worth noting that the transmission components include a transmission gear 62, with a drive gear 63 meshing on its surface. The drive gear 63 is mounted on the outer sleeve 52, and the transmission gear 62 is connected to the rotating shaft 71. A slot 70 is provided on the pressure sleeve 61, allowing the outer sleeve 52 to engage with it. The gear ratio between the drive gear 63 and the transmission gear 62 is 1:5, and both gears are located inside the shroud 3. By significantly reducing the relatively high rotational speed of the gearbox 2 output shaft, the transmission to the rotating shaft 71 and its spiral groove 64 mechanism, responsible for load adjustment, is significantly reduced. This keeps the reciprocating frequency of the sliding frame 67 at a reasonably low level, facilitating observation and testing, thus simulating a relatively smooth load cycle. First, it encloses all high-speed rotating transmission components within the protective housing of the shroud 3, improving operational safety and preventing oil splashes or foreign object ingress. Second, it may help utilize the airflow inside the shroud 3 to dissipate heat from the gear pair. Furthermore, it makes the overall structure more compact and streamlined.

[0027] The working principle is as follows: First, the operator installs the gearbox 2 on the mounting position of the test frame 1. Then, the pressure sleeve 61 is pressed down, causing the insert sleeve 51 located in the slot 70 to disengage. The insert sleeve 51 is then compressed by the spring force of the compression spring 53, controlling the insert sleeve 51 to insert into the output shaft of the gearbox 2, achieving a locking connection. The drive motor then starts at the input end of the gearbox 2, controlling the gearbox 2 to run. Through the gear transmission inside the gearbox 2, power is transmitted to the output end. Then, using the plug-in connection of the insert sleeve 51, the insert sleeve 51 will rotate synchronously. The insert sleeve 51 is connected via a keyway... Connected to the outer casing 52, it will synchronously drive the outer casing 52 to rotate. Under the condition of the rotation of the outer casing 52, the blade 54 will be driven to rotate through the connecting rod. Then, under the condition of the rotation of the blade 54, airflow will be generated. The airflow will impact the pressure plate 41 in the wind cover 3 along the channel. Then the pressure plate 41 will slide laterally on the wind cover 3, squeezing the pressure spring 43 and synchronously driving the rack 42 to move laterally. The lateral movement of the rack 42 will drive the rotation of the large gear 44 through the meshing between the teeth. The large gear 44 will drive the pointer 46 to rotate on the display dial 45. Therefore, the entire principle converts the output power of gearbox 2 into the rotational airflow power of blade 54. If gearbox 2 is stuck or not running smoothly, the power transmission of blade 54 will be unstable. In other words, the intensity of the converted airflow will change instantaneously. Since changes in airflow are relatively easy to capture, the entire testing principle uses the rotation of gearbox 2 to convert its rotational force into airflow intensity. The torque generated by the airflow intensity drives the change, allowing us to directly observe the smoothness of gearbox 2's operation. If the airflow fluctuates, it will be converted into the forward and reverse rotation of pointer 46, which will greatly reflect the smoothness of gearbox 2. Of course, the operator can also control the gearbox 2's shifting, switching it to higher or lower gears to directly observe whether the airflow pressure change value of each gear is stable.

[0028] To enhance the realism of the testing environment, a pressure device 6 was installed to simulate the load on the output end of the gearbox 2. When the outer sleeve 52 rotates, it synchronously drives the drive gear 63 to rotate. The rotation of the drive gear 63 then drives the transmission gear 62 to rotate through the meshing of its teeth. The transmission gear 62 then drives the rotating shaft 71 to rotate. The spiral groove 64 on the rotating shaft 71 is a reciprocating groove for a reciprocating lead screw. When it rotates, it reciprocates left and right, causing the sliding plate 65 on the sliding pin to slide left and right. Under this left-right sliding condition, the sliding plate 65 will slide at the position of the inclined groove 68, thereby driving... The upward and downward movement of the sliding bracket 67 causes it to cycle repeatedly. The upward movement of the sliding bracket 67 will drive multiple telescopic springs 69 to elastically compress the pressure sleeve 61. At this time, the pressure sleeve 61 is in contact with the rotating insert 51. Therefore, the elastic compression and the friction generated on the surface will generate a certain damping on the insert 51. Thus, the gearbox 2 needs to overcome the friction to achieve transmission. The friction at this point is a simulated load force. According to the cyclic compression of the telescopic springs 69, the friction force runs in a reciprocating cycle of increasing-decreasing-increasing, thereby simulating the operating state and smoothness of the gearbox 2 under different load conditions. Meanwhile, a push rod 47 is set to abut against the output shaft of the gearbox 2. When the insert 51 is stuck in the slot 70, the connector 5 is not connected to the gearbox 2. At this time, the operation of the gearbox 2 can be directly controlled to simulate no-load operation. At this time, the push rod 47 abuts against the surface of the output end of the gearbox 2. If the jumping or vibration is too large in the no-load state, the vibration will be transmitted to the push rod 47. Then, the synchronous vibration of the push rod 47 is controlled, and the vibration of the push rod 47 will be transmitted to the rack 49 through the support rod. Then, the rack 49 will drive the pinion 50 to rotate according to the meshing of the teeth, and then transmit the rotational force to the arrow. The jumping and vibration parameters of the gearbox 2 at this time can be judged by the rotation of the arrow.

[0029] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A gearbox testing device, characterized in that: include: Test fixture (1); A gearbox (2) is mounted on a test fixture (1); The test and display device (4) is used to test and display the operation of the gearbox (2); A drive motor is connected to the input end of a gearbox (2), and the output end of the gearbox (2) is connected to a display device (4) via a connector (5). Pressure device (6) is used to simulate different loads; The measuring and display device (4) includes a wind cover (3), which is mounted on the test frame (1). The wind cover (3) has a long groove, and a pressure plate (41) is slidably connected to the long groove. A pressure spring (43) is connected to the side of the pressure plate (41), and the right end of the pressure spring (43) is connected to the wind cover (3). The connecting piece (5) converts the rotational power of the gearbox (2) into wind power to drive the pressure plate (41) to move laterally.

2. The gearbox testing device according to claim 1, characterized in that: A toothed slide rod (42) is fixedly connected to the pressure plate (41), and a large gear (44) meshes with the toothed slide rod (42). A pointer (46) is connected to the axis of the large gear (44) via a connecting rod. A display panel (45) is connected to the side of the wind cover (3). The large gear (44) is mounted on the wind cover (3) via a mounting bracket.

3. The gearbox testing device according to claim 2, characterized in that: The connector includes a sleeve (51) which is inserted into the output end of the gearbox (2). The surface of the sleeve (51) is slidably connected to an outer sleeve (52) via a keyway. The outer sleeve (52) is rotatably connected to the test frame (1). A compression spring (53) is connected to the side of the sleeve (51). One end of the compression spring (53) abuts against the outer sleeve (52). A blade (54) is connected to the right side of the outer sleeve (52) via a connecting rod. The blade (54) is located inside the wind shield (3).

4. The gearbox testing device according to claim 3, characterized in that: A central rod (48) is connected to the wind shield (3). A support rod is slidably connected to the surface of the central rod (48). A top rod (47) is connected to one end of the support rod, and a rack (49) is connected to the other end of the support rod. The top rod (47) abuts against the output end surface of the gearbox (2). A pinion (50) meshes with the surface of the rack (49). An arrow is connected to the pinion (50) through a sleeve. The pinion (50) is rotatably connected to the large gear (44).

5. A gearbox testing device according to claim 4, characterized in that: The pressure device (6) includes a pressure sleeve (61), on which four insert rods are slidably connected. A telescopic spring (69) is sleeved on the surface of each insert rod. A sliding frame (67) is connected to the bottom of each insert rod. A groove (68) is opened on the surface of the sliding frame (67). The pressure sleeve (61) abuts against the surface of the insert sleeve (51).

6. A gearbox testing device according to claim 5, characterized in that: The test frame (1) is rotatably connected to a rotating shaft (71). The surface of the rotating shaft (71) is provided with a spiral groove (64). A sliding pin is slidably connected to the surface of the spiral groove (64). A sliding plate (65) is connected to the sliding pin. A sliding pin (66) is connected to the top of the sliding plate (65). The sliding pin (66) is slidably connected to the inclined groove (68). One end of the rotating shaft (71) is connected to a transmission component.

7. A gearbox testing device according to claim 6, characterized in that: The transmission component includes a transmission gear (62), the surface of which is meshed with a drive gear (63), the drive gear (63) is mounted on an outer sleeve (52), and the transmission gear (62) is connected to a rotating shaft (71).

8. A gearbox testing device according to claim 6, characterized in that: The pressure sleeve (61) has a slot (70) and the outer sleeve (52) can be engaged in the slot (70).

9. A gearbox testing device according to claim 7, characterized in that: The ratio of the number of teeth of the drive gear (63) to the transmission gear (62) is 1:5, and both the drive gear (63) and the transmission gear (62) are located inside the shroud (3).

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