A gearbox housing vibration endurance test device and a use method thereof

Abstract

The application relates to the technical field of vibration testing devices, in particular to a gearbox shell vibration endurance testing device and a use method thereof. The device comprises a testing table, the upper end of the testing table is fixedly provided with a plurality of supporting seats, the supporting seats are used for supporting and positioning the gearbox to be detected, a locking shaft is arranged above each supporting seat, the locking shaft is fixedly connected with the gearbox, so that the gearbox can be reliably fixed on the testing table, a connecting sleeve is detachably arranged at the bottom end of the gearbox, a supporting frame is fixedly connected to the surface of the connecting sleeve, a counterweight disc is rotatably arranged at the upper end of the supporting frame, the counterweight disc is used as an output load, the rotating inertia of the output end of the gearbox is applied, the output load state in the actual working process of the gearbox is simulated, the mass distribution of the counterweight disc is dynamically changed in the rotating process, and the unstable vibration state caused by the load change in the actual running process of the gearbox is simulated.

Description

Technical Field

[0001] This invention relates to the field of vibration testing equipment technology, specifically to a vibration durability testing device for a gearbox housing and its usage method. Background Technology

[0002] With the development of the automotive industry, the transmission, as a key component of the vehicle's power transmission system, directly affects the vehicle's operational stability and service life. As the load-bearing structure for the internal gears, shafts, and related transmission components, the transmission housing not only bears the periodic loads generated by the internal transmission components during vehicle operation, but also suffers from complex dynamic loads such as road impacts, engine vibrations, and power system excitations during vehicle operation. Long-term service can easily lead to fatigue deformation, cracks, or even structural failure. Therefore, in the process of transmission research and development and production, it is necessary to conduct vibration durability tests on the transmission housing to evaluate its structural strength and reliability.

[0003] Existing gearbox housing vibration durability testing devices typically apply a preset vibration load to the gearbox using a vibration table, excitation mechanism, or loading mechanism, and collect vibration response data through sensing devices to determine the vibration resistance performance of the gearbox housing. However, most existing testing methods use vibration input with fixed frequency and fixed amplitude, resulting in relatively simple vibration conditions during the test. This makes it difficult to simulate the complex vibration states caused by changes in road conditions, power output, and load during actual vehicle operation, leading to a certain deviation between the test results and the actual usage environment. Therefore, this application proposes a gearbox housing vibration durability testing device and its usage method. Summary of the Invention

[0004] The purpose of this invention is to provide a gearbox housing vibration durability testing device and method, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a gearbox housing vibration durability testing device, comprising a test bench, wherein multiple support seats are fixedly installed on the upper end of the test bench, the multiple support seats are used to support and position the gearbox to be tested, a locking shaft is provided above each support seat, the locking shaft is fixedly connected to the gearbox so as to reliably fix the gearbox on the test bench, a connecting sleeve is detachably installed at the bottom end of the gearbox, a support frame is fixedly connected to the surface of the connecting sleeve, a counterweight plate is rotatably installed at the upper end of the support frame, the counterweight plate is fixedly connected to the output end of the gearbox so that the counterweight plate can rotate synchronously with the output end of the gearbox, and the counterweight plate is used as an output load to apply rotational inertia to the output end of the gearbox to simulate the output load state during the actual operation of the gearbox.

[0006] As a further embodiment of the present invention, a drive motor is fixedly mounted on the surface of the test bench, and the output end of the drive motor is connected to a drive shaft via a universal joint. A transmission rod is slidably sleeved on the surface of the drive shaft, and the end of the transmission rod away from the drive motor is connected to the input side of the gearbox via a universal joint, so that the power output by the drive motor can be transmitted to the gearbox.

[0007] As a further embodiment of the present invention, the support base is provided with two sets of buffer sleeves inside, wherein the lower buffer sleeve is fixedly connected to the interior of the support base, and the upper buffer sleeve is fixedly connected to the bottom end of the locking shaft, so that the vibration generated by the gearbox can be transmitted between the two sets of buffer sleeves. Multiple stabilizing sleeves are fixedly installed inside the support base. The multiple stabilizing sleeves are evenly arranged in a ring around the circumference of the upper buffer sleeve. Each of the multiple stabilizing sleeves has a top rod passing through it on the side near the buffer sleeve, and the end of the top rod abuts against the outer surface of the upper buffer sleeve.

[0008] As a further embodiment of the present invention, a plurality of auxiliary spring pieces are fixedly installed circumferentially inside the buffer sleeve, and a plurality of spring pieces are provided between the two buffer sleeves. The plurality of spring pieces are evenly arranged in a ring shape circumferentially, and the upper and lower ends of the spring pieces respectively abut against the surface of the corresponding auxiliary spring pieces. The spring pieces have a "C" shaped structure. When the upper buffer sleeve moves downward with the vibration of the gearbox, the spring pieces are compressed and undergo elastic deformation. An auxiliary bladder is provided between the two buffer sleeves. The upper and lower sides of the auxiliary bladder are fixedly connected to the surface of the corresponding buffer sleeve, and the auxiliary bladder is located in the internal area surrounded by the plurality of spring pieces.

[0009] As a further embodiment of the present invention, a diversion pipe is fixedly installed below the connecting sleeve via a connecting frame, a return cylinder is fixedly installed at the upper end of the diversion pipe, a water distributor is fixedly connected to the bottom end of the diversion pipe, and multiple connecting pipes are fixedly connected to the outer surface of the water distributor, with the multiple connecting pipes respectively connected to the auxiliary bladders in the corresponding directions.

[0010] As a further embodiment of the present invention, a central tube is fixedly installed at the upper end of the reflux cylinder. The central tube is connected to the diversion tube. The diversion tube has two independent flow chambers inside. One flow chamber is connected to the interior of the reflux cylinder through a connecting hole on the surface of the diversion tube, and the other flow chamber is connected to the central tube to form independent fluid transport channels for fluid output and reflux, respectively.

[0011] As a further embodiment of the present invention, a passive tube is rotatably installed inside the connecting sleeve, and a circulation plate is fixedly installed on the outer surface of the passive tube. Multiple output holes are opened on the outer surface of the passive tube, and the multiple output holes are all located above the circulation plate. The circulation plate divides the internal space of the connecting sleeve into an independent upper chamber and a lower chamber, so that the fluid inside the connecting sleeve can selectively flow between the two chambers under the control of the circulation plate.

[0012] As a further embodiment of the present invention, a baffle is fixedly installed inside the connecting sleeve. The baffle is fitted to the surface of the circulation plate. Both the baffle and the circulation plate have through holes on their surfaces. A transmission ring is rotatably installed at the bottom end of the connecting sleeve. The transmission ring is fixedly connected to the bottom end of the passive tube, so that the transmission ring can drive the passive tube to rotate synchronously. The passive tube is rotatably connected to the central tube to ensure that the central tube and the passive tube remain in a connected state during the rotation of the passive tube. A spindle is fixedly installed on the surface of the transmission ring. The center of gravity of the spindle is offset from its own rotation center, so that the spindle forms an eccentric structure. When the connecting sleeve vibrates with the gearbox, the spindle will oscillate randomly under the action of gravity and vibration inertia, and drive the transmission ring and the passive tube to rotate synchronously.

[0013] As a further embodiment of the present invention, a transmission sleeve is fixedly installed on the surface of the counterweight disc, and a movable plug is slidably installed inside the transmission sleeve. The movable plug is connected to the transmission sleeve by a return spring, so that the movable plug can reciprocate axially inside the transmission sleeve. A passive sleeve is fixedly installed above the support frame, and the passive sleeve is rotatably connected to the transmission sleeve. A one-way valve is fixedly connected to the surface of the return cylinder, and the one-way valve only allows fluid to enter the interior of the return cylinder.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention sets up a circulation plate and a baffle, and uses the correspondence between the through holes to control the opening and closing of the fluid passage inside the connecting sleeve, so that the fluid pressure can act on the movable plug intermittently, thereby driving the counterweight to move back and forth inside the auxiliary cylinder. This causes the counterweight plate to generate a dynamically changing mass distribution during rotation, simulating the unstable vibration state caused by load changes during the actual operation of the gearbox. Compared with the traditional test method that only applies vibration at a fixed frequency, this invention improves the complexity and reliability of the test conditions. 2. This invention sets a spindle inside the connecting sleeve and uses the eccentric structure of the spindle to make it rotate irregularly during the vibration of the gearbox, which further changes the conduction state between the circulation plate and the baffle, so that the fluid circulation process and the counterweight adjustment process have dynamic change characteristics. This makes the gearbox subject to multi-factor coupled vibration, which is closer to the vibration state under the actual vehicle operating environment, and improves the reference value of vibration durability test results. 3. This invention sets an auxiliary bladder between the buffer sleeves and uses the reciprocating movement of the buffer sleeves during gearbox vibration to cause the auxiliary bladder to be periodically compressed and released, thereby driving the fluid medium to circulate between the connecting pipe, water distributor, diverter pipe and central pipe. This realizes the use of the gearbox's own vibration energy to drive the test disturbance mechanism, without the need for an additional independent drive structure, thus improving the compactness of the device structure and the synchronization of the vibration simulation process. Attached Figure Description

[0015] Figure 1 A schematic diagram of the gearbox housing vibration durability testing device; Figure 2 This is a schematic diagram of the connection structure between the drive shaft and the transmission rod; Figure 3 This is a structural diagram showing the disassembled support base and gearbox; Figure 4 This is a schematic diagram of the internal structure of the support base; Figure 5 This is a schematic diagram of the internal structure of a connecting pipe; Figure 6 This is a structural diagram of the connecting sleeve; Figure 7 This is a schematic diagram of the cross-section of the reflux cylinder; Figure 8 This is a schematic diagram showing the internal structure of the connecting sleeve after disassembly. Figure 9 This is a schematic diagram of the internal structure of the transmission ring; Figure 10 This is a schematic diagram of the internal structure of the transmission sleeve; Figure 11 This is a schematic diagram of the internal structure of the auxiliary cylinder.

[0016] In the diagram: 1. Test bench; 2. Drive motor; 3. Transmission rod; 4. Gearbox; 31. Drive shaft; 101. Support base; 102. Locking shaft; 103. Stabilizing sleeve; 104. Top rod; 105. Connecting pipe; 106. Buffer sleeve; 107. Auxiliary spring; 108. Spring plate; 109. Water distributor; 110. Auxiliary bladder; 201. Connecting sleeve; 202. Spindle; 203. Return cylinder; 204. Diverter pipe; 205. Check valve; 206. Central tube; 207. Drive ring; 208. Passive tube; 209. Output port; 210. Circulation plate; 211. Baffle; 212. Through hole; 213. Resistance plate; 214. Locking plate; 301. Counterweight plate; 302. Transmission sleeve; 303. Auxiliary cylinder; 304. Support frame; 305. Return pipe; 306. Passive sleeve; 307. Movable plug; 308. Return spring; 309. Input pipe; 310. Counterweight block; 311. Safety rope. Detailed Implementation

[0017] 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.

[0018] Example 1: Please refer to Figures 1-3 A vibration durability testing device for a gearbox housing includes a test bench 1. Multiple support seats 101 are fixedly installed on the upper end of the test bench 1. The multiple support seats 101 are used to support and position the gearbox 4 to be tested. A locking shaft 102 is passed through the upper part of each of the multiple support seats 101. The locking shaft 102 is fixedly connected to the gearbox 4 by bolts so as to reliably fix the gearbox 4 on the test bench 1, ensure the stability of the installation state of the gearbox 4 during the vibration durability test, and avoid the test results being affected by loose installation. A connecting sleeve 201 is detachably installed at the bottom of the gearbox 4 by bolts. A support frame 304 is fixedly connected to the surface of the connecting sleeve 201. A counterweight plate 301 is rotatably installed at the upper end of the support frame 304. The counterweight plate 301 is fixedly connected to the output end of the gearbox 4, so that the counterweight plate 301 can rotate synchronously with the output end of the gearbox 4. The counterweight plate 301 is used as the output load to apply rotational inertia to the output end of the gearbox 4 to simulate the output load state of the gearbox 4 in the actual working process, avoid the gearbox 4 from running in an unloaded state, and improve the closeness between the vibration durability test conditions and the actual use conditions. A drive motor 2 is fixedly mounted on the surface of the test bench 1. The output end of the drive motor 2 is connected to a drive shaft 31 via a universal joint. A transmission rod 3 is slidably fitted onto the surface of the drive shaft 31. The transmission rod 3 and the drive shaft 31 are fitted with an anti-rotation fit, allowing the transmission rod 3 to slide along the axial direction of the drive shaft 31 and rotate synchronously with the drive shaft 31 to ensure stable transmission of driving force and prevent circumferential rotation of the transmission rod 3 relative to the drive shaft 31. The end of the transmission rod 3 away from the drive motor 2 is connected to the input side of the gearbox 4 via a universal joint, allowing the power output from the drive motor 2 to be transmitted to the gearbox 4. At the same time, the axial sliding fit between the transmission rod 3 and the drive shaft 31 compensates for the axial displacement generated during the vibration of the gearbox 4, reduces the transmission of lateral thrust and assembly stress generated by vibration to the drive motor 2, and avoids interference from additional constraints on the vibration state of the gearbox 4, thereby improving the authenticity and reliability of the vibration durability test results.

[0019] like Figures 3-5As shown, the support base 101 has two sets of buffer sleeves 106 inside. The lower buffer sleeve 106 is fixedly connected to the inside of the support base 101, and the upper buffer sleeve 106 is fixedly connected to the bottom end of the locking shaft 102, so that the vibration generated by the gearbox 4 can be transmitted between the two sets of buffer sleeves 106. The locking shaft 102 is connected to the support base 101 through a sealing cover to seal the inside of the support base 101, preventing external dust and impurities from entering the inside of the support base 101 and ensuring the long-term stable operation of the buffer mechanism. Multiple stabilizing sleeves 103 are fixedly installed inside the support base 101. The multiple stabilizing sleeves 103 are evenly arranged in a ring around the circumference of the upper buffer sleeve 106. Each of the multiple stabilizing sleeves 103 has a push rod 104 passing through it on the side of the buffer sleeve 106. The end of the push rod 104 abuts against the outer surface of the upper buffer sleeve 106. A sealed air cavity is formed between the stabilizing sleeve 103 and the push rod 104. When the upper buffer sleeve 106 is radially offset, the push rod 104 on the corresponding side moves into the stabilizing sleeve 103, which compresses the air inside the stabilizing sleeve 103 and generates elastic support force, thereby limiting the lateral displacement of the upper buffer sleeve 106, improving the lateral stability of the buffer sleeve 106 during vibration, and ensuring the consistency of the support state during the vibration durability test of the gearbox 4. All moving parts inside the support base 101 are coated with grease to reduce motion friction and wear of parts, and improve the service life and operational stability of the buffer mechanism. Multiple auxiliary spring plates 107 are fixedly installed circumferentially inside the buffer sleeve 106. Multiple spring plates 108 are provided between two buffer sleeves 106. The multiple spring plates 108 are evenly arranged in a ring shape circumferentially, and the upper and lower ends of the spring plates 108 respectively abut against the surface of the corresponding auxiliary spring plate 107. The spring plates 108 have a "C" shaped structure. When the upper buffer sleeve 106 moves downward with the vibration of the gearbox 4, the spring plates 108 are compressed and undergo elastic deformation. The load is evenly transferred to the spring plates 108 through the auxiliary spring plates 107, so that the spring plates 108 can buffer and absorb the impact load generated by the vibration of the gearbox 4, and can provide elastic support for the radial load generated during the vibration process. This reduces the direct transmission of vibration impact to the test bench 1, so that the gearbox 4 maintains an installation state with certain elastic support characteristics during the test, and improves the closeness between the vibration durability test conditions and the actual installation conditions. An auxiliary bladder 110 is provided between the two buffer sleeves 106. The upper and lower sides of the auxiliary bladder 110 are fixedly connected to the surfaces of the corresponding buffer sleeves 106, and the auxiliary bladder 110 is located in the internal area surrounded by multiple spring plates 108. When the upper buffer sleeve 106 vibrates and moves up and down with the gearbox 4, the auxiliary bladder 110 is periodically compressed and rebounded as the distance between the two sets of buffer sleeves 106 changes, providing power for the subsequent fluid and cooperating with the reciprocating motion of the buffer sleeves 106 to realize the circulation and pressure of the internal fluid.

[0020] Example 2: Please refer to Figures 4-6 A gearbox housing vibration durability testing device, based on Embodiment 1, has a diversion pipe 204 fixedly installed below the connecting sleeve 201 via a connecting frame, a return cylinder 203 fixedly installed at the upper end of the diversion pipe 204, and a water distributor 109 fixedly connected to the bottom end of the diversion pipe 204. Multiple connecting pipes 105 are fixedly connected to the outer surface of the water distributor 109, and the multiple connecting pipes 105 are respectively connected to the auxiliary bladders 110 in the corresponding directions, so that the multiple auxiliary bladders 110 can be connected to the water distributor 109 through the corresponding connecting pipes 105, so as to realize the centralized transportation of internal fluid during the compression and rebound of the auxiliary bladders 110.

[0021] Specifically, the connecting pipe 105 has two independent flow channels inside. One flow channel is used for the output of fluid inside the auxiliary bladder 110, and the other flow channel is used for fluid return. When the auxiliary bladder 110 is compressed, it can transport the internal fluid to the water distributor 109 through the corresponding output channel, and replenish the fluid through the corresponding return channel when the auxiliary bladder 110 rebounds and resets. This forms a circulating flow path, providing a stable flow path for the circulating pressure of fluid during the up-and-down reciprocating motion of the buffer sleeve 106, improving the consistency of fluid delivery among multiple auxiliary bladders 110, and ensuring that the buffer mechanism can continuously and stably provide buffer support.

[0022] like Figures 5-8 As shown, a central tube 206 is fixedly installed at the upper end of the return cylinder 203. The central tube 206 is connected to the diversion tube 204. The diversion tube 204 has two independent flow chambers inside. One flow chamber is connected to the interior of the return cylinder 203 through a connecting hole on the surface of the diversion tube 204. The other flow chamber is connected to the central tube 206 to form independent fluid transport paths for fluid output and return, respectively. A passive tube 208 is rotatably mounted inside the connecting sleeve 201. A circulation plate 210 is fixedly mounted on the outer surface of the passive tube 208. Multiple output holes 209 are opened on the outer surface of the passive tube 208. All the output holes 209 are located above the circulation plate 210. The circulation plate 210 divides the internal space of the connecting sleeve 201 into an independent upper chamber and a lower chamber, so that the fluid inside the connecting sleeve 201 can selectively flow between the two chambers under the control of the circulation plate 210. A baffle 211 is fixedly installed inside the connecting sleeve 201. The baffle 211 is fitted to the surface of the circulation plate 210 to reduce fluid leakage between the upper and lower chambers. Both the surface of the baffle 211 and the circulation plate 210 are provided with through holes 212. The surface of the baffle 211 has one through hole 212, and the surface of the circulation plate 210 has multiple through holes 212 distributed circumferentially. When the circulation plate 210 rotates relative to the baffle 211, any one of the through holes 212 on the surface of the circulation plate 210 can selectively correspond and connect with the through hole 212 on the surface of the baffle 211, so that the upper chamber and the lower chamber inside the connecting sleeve 201 are connected. When the through holes 212 are misaligned, the upper chamber and the lower chamber remain isolated, thereby realizing the switching of the fluid flow state inside the connecting sleeve 201. A transmission ring 207 is rotatably mounted on the bottom end of the connecting sleeve 201. The transmission ring 207 is fixedly connected to the bottom end of the driven tube 208, enabling the transmission ring 207 to drive the driven tube 208 to rotate synchronously. The driven tube 208 is rotatably connected to the center tube 206 to ensure that the center tube 206 and the driven tube 208 remain in a continuous state during the rotation of the driven tube 208. A spindle 202 is fixedly mounted on the surface of the transmission ring 207. The center of gravity of the spindle 202 is offset from its own rotation center, making the spindle 202 an eccentric structure. When the connecting sleeve 201 changes direction... When the gearbox 4 vibrates, the spindle 202 swings randomly under the action of gravity and vibration inertia, which drives the transmission ring 207 and the passive tube 208 to rotate synchronously. This causes the circulation plate 210 to rotate randomly relative to the baffle 211, so that the through hole 212 on the surface of the circulation plate 210 and the through hole 212 on the surface of the baffle 211 are randomly connected. This makes the timing of the connection between the two chambers inside the connecting sleeve 201 change continuously with the vibration state, so as to simulate the more complex vibration conditions in the actual operation of the gearbox 4 and improve the authenticity of the vibration durability test.

[0023] like Figure 8 , Figure 9 As shown, a resistance plate 213 is provided on the surface of the transmission ring 207, and a locking plate 214 is slidably mounted on the surface of the transmission ring 207. The lower end of the resistance plate 213 is provided with an inclined guide surface. The locking plate 214 can slide along the radial direction of the transmission ring 207. When the locking plate 214 moves toward the resistance plate 213, the end of the locking plate 214 abuts against the inclined guide surface at the lower end of the resistance plate 213 and pushes the resistance plate 213 to move upward in the vertical direction, so that the resistance plate 213 gradually approaches the bottom end of the connecting sleeve 201. As the locking plate 214 continues to move, the upward movement distance of the resistance plate 213 gradually increases, and the contact pressure between the resistance plate 213 and the inner wall of the bottom end of the connecting sleeve 201 increases accordingly, thereby increasing the frictional resistance encountered by the transmission ring 207 when it rotates, so as to adjust the rotation damping of the transmission ring 207. When the resistance plate 213 moves to the highest position, the resistance plate 213 and the inner wall of the bottom end of the connecting sleeve 201 are pressed together, so that the transmission ring 207 is in a locked state, restricting the rotation of the connecting sleeve 201. The outer surface of the transmission ring 207 is provided with a position mark. When the position mark corresponds to a preset position, it indicates that the through hole 212 on the surface of the circulation plate 210 and the through hole 212 on the surface of the baffle 211 are in a corresponding conductive state.

[0024] like Figure 3 , Figure 7 , Figure 9 , Figure 11 A transmission sleeve 302 is fixedly installed on the surface of the counterweight plate 301. A movable plug 307 is slidably installed inside the transmission sleeve 302. The movable plug 307 is connected to the transmission sleeve 302 by a return spring 308, so that the movable plug 307 can move back and forth axially inside the transmission sleeve 302 and remain in the reset state under the elastic action of the return spring 308. A passive sleeve 306 is fixedly installed on the top of the support frame 304. The passive sleeve 306 is rotatably connected to the transmission sleeve 302, so that the transmission sleeve 302 remains connected to the return pipe 305 during the rotation of the counterweight plate 301 with the output end of the gearbox 4. A one-way valve 205 is fixedly connected to the surface of the return cylinder 203. The one-way valve 205 only allows fluid to enter the interior of the return cylinder 203 to limit the direction of fluid flow and prevent fluid from flowing back in reverse. A return pipe 305 is fixedly installed inside and outside the support frame 304. The input end of the return pipe 305 inside the support frame 304 is fixedly connected to the connecting sleeve 201, and its connection position is located in the lower chamber of the baffle 211, so that the fluid in the lower chamber of the connecting sleeve 201 can be transported to the subsequent structure through the return pipe 305. The output end of the return pipe 305 inside the support frame 304 is connected to the inside of the passive sleeve 306. The return pipe 305 outside the support frame 304 passes through the passive sleeve 306 and the movable plug 307 in sequence, and is connected to the chamber formed on the right side of the movable plug 307, so that a fluid transport path is formed between different positions. A counterweight 310 is slidably installed inside the auxiliary cylinder 303. The counterweight 310 is connected to the auxiliary cylinder 303 by a safety rope 311 to limit the movement range of the counterweight 310 inside the auxiliary cylinder 303 and prevent the counterweight 310 from detaching from the auxiliary cylinder 303. An input pipe 309 is fixedly connected to the upper end of the auxiliary cylinder 303. The input pipe 309 is fixedly connected to the transmission sleeve 302. In the initial state, the input end of the input pipe 309 is located in the right chamber of the movable plug 307, so that the fluid inside the transmission sleeve 302 can enter the auxiliary cylinder 303 according to the movement state of the movable plug 307.

[0025] The working principle of this invention is: During operation, the drive motor 2 drives the gearbox 4 to run. During the operation of the gearbox 4, the counterweight plate 301 rotates. At this time, the gearbox 4 is in a vibrating state under the support of the connecting sleeve 201. When the auxiliary bladder 110 moves up and down with the buffer sleeve 106 and is continuously compressed and released, the fluid medium inside the auxiliary bladder 110 is periodically squeezed. The fluid medium can be fluid or hydraulic oil. During the compression process of the auxiliary bladder 110, the internal fluid enters the water distributor 109 through the connecting pipe 105, and is transported to the inside of the connecting sleeve 201 through the diversion pipe 204 and the central pipe 206, so that the fluid pressure acts on the chamber above the circulation plate 210. When the through holes 212 on the surfaces of the circulation plate 210 and the baffle 211 are in a corresponding communication state, the fluid in the upper chamber of the circulation plate 210 enters the lower chamber of the circulation plate 210 through the through holes 212, and is further transported to the passive sleeve 306 through the return pipe 305 located inside the support frame 304. Under the action of fluid pressure, the movable plug 307 overcomes the elastic force of the return spring 308 and moves along the inside of the transmission sleeve 302. When the movable plug 307 moves to the predetermined position, the input pipe 309 is connected to the left chamber of the movable plug 307. At this time, the fluid medium enters the auxiliary cylinder 303 through the input pipe 309, causing the pressure inside the auxiliary cylinder 303 to gradually increase. As the internal pressure of the auxiliary cylinder 303 increases, the counterweight 310 is subjected to fluid pressure and moves away from the auxiliary cylinder 303. Due to the change in the position of the counterweight 310, the mass distribution of the counterweight disk 301 changes during rotation, thereby causing the counterweight disk 301 to generate unstable vibration disturbance during rotation, in order to simulate the dynamic vibration caused by load changes during the actual operation of the gearbox 4. Conversely, when the auxiliary bladder 110 is released and returns to its original shape, the fluid pressure inside the connecting sleeve 201 decreases, and the return pipe 305 located outside the support frame 304 forms a return flow effect on the right chamber of the movable plug 307, causing the movable plug 307 to reset under the action of pressure change and return spring 308. At the same time, the fluid inside the auxiliary cylinder 303 returns, causing the counterweight 310 to move towards the auxiliary cylinder 303, and the mass distribution of the counterweight plate 301 gradually returns to a stable state. The irregular eccentric rotation of the spindle 202 during the vibration of the gearbox 4, and the dynamic mass change caused by the reciprocating movement of the counterweight 310, cause the gearbox 4 to be affected by multi-factor coupled vibration during the test, thereby improving the closeness between the vibration durability test conditions and the actual use conditions, and making the data obtained from the test more valuable for reference.

[0026] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vibration durability testing device for a gearbox housing, comprising a test bench (1), characterized in that: The upper end of the test bench (1) is fixedly equipped with multiple support seats (101). The multiple support seats (101) are used to support and position the gearbox (4) to be tested. Each support seat (101) is equipped with a locking shaft (102). The locking shaft (102) is fixedly connected to the gearbox (4) so ​​as to reliably fix the gearbox (4) on the test bench (1). The bottom end of the gearbox (4) is detachably equipped with a connecting sleeve (201). The surface of the connecting sleeve (201) is fixedly connected with a support frame (304). The upper end of the support frame (304) is rotatably equipped with a counterweight plate (301). The counterweight plate (301) is fixedly connected to the output end of the gearbox (4) so ​​that the counterweight plate (301) can rotate synchronously with the output end of the gearbox (4). The counterweight plate (301) is used as the output load to apply rotational inertia to the output end of the gearbox (4) to simulate the output load state of the gearbox (4) in actual operation.

2. The gearbox housing vibration durability testing device according to claim 1, characterized in that: A drive motor (2) is fixedly installed on the surface of the test bench (1). The output end of the drive motor (2) is connected to a drive shaft (31) via a universal joint. A transmission rod (3) is slidably sleeved on the surface of the drive shaft (31). The end of the transmission rod (3) away from the drive motor (2) is connected to the input side of the gearbox (4) via a universal joint, so that the power output by the drive motor (2) can be transmitted to the gearbox (4).

3. The gearbox housing vibration durability testing device according to claim 2, characterized in that: The support base (101) is provided with two sets of buffer sleeves (106). The lower buffer sleeve (106) is fixedly connected to the inside of the support base (101), and the upper buffer sleeve (106) is fixedly connected to the bottom end of the locking shaft (102), so that the vibration generated by the gearbox (4) can be transmitted between the two sets of buffer sleeves (106). Multiple stabilizing sleeves (103) are fixedly installed inside the support base (101). The multiple stabilizing sleeves (103) are evenly arranged in a ring along the circumference of the upper buffer sleeve (106). Each of the multiple stabilizing sleeves (103) has a push rod (104) passing through it on the side of the buffer sleeve (106), and the end of the push rod (104) abuts against the outer surface of the upper buffer sleeve (106).

4. The gearbox housing vibration durability testing device according to claim 3, characterized in that: Multiple auxiliary spring pieces (107) are fixedly installed circumferentially inside the buffer sleeve (106). Multiple spring pieces (108) are provided between the two buffer sleeves (106). The multiple spring pieces (108) are evenly arranged in a ring shape circumferentially, and the upper and lower ends of the spring pieces (108) respectively abut against the surface of the corresponding auxiliary spring pieces (107). The spring pieces (108) have a "C" shaped structure. When the upper buffer sleeve (106) moves downward with the vibration of the gearbox (4), the spring pieces (108) are compressed and undergo elastic deformation. An auxiliary bladder (110) is provided between the two buffer sleeves (106). The upper and lower sides of the auxiliary bladder (110) are fixedly connected to the surface of the corresponding buffer sleeve (106), and the auxiliary bladder (110) is located in the internal area surrounded by multiple spring pieces (108).

5. The gearbox housing vibration durability testing device according to claim 1, characterized in that: A diversion pipe (204) is fixedly installed below the connecting sleeve (201) via a connecting bracket. A return cylinder (203) is fixedly installed at the upper end of the diversion pipe (204). A water distributor (109) is fixedly connected to the bottom end of the diversion pipe (204). Multiple connecting pipes (105) are fixedly connected to the outer surface of the water distributor (109). The multiple connecting pipes (105) are respectively connected to the auxiliary bladder (110) in the corresponding direction.

6. The gearbox housing vibration durability testing device according to claim 5, characterized in that: The upper end of the return cylinder (203) is fixedly installed with a central tube (206). The central tube (206) is connected to the diversion tube (204). The diversion tube (204) has two independent flow chambers inside. One flow chamber is connected to the inside of the return cylinder (203) through a connecting hole on the surface of the diversion tube (204), and the other flow chamber is connected to the central tube (206) to form independent fluid transport channels for fluid output and return, respectively.

7. The gearbox housing vibration durability testing device according to claim 6, characterized in that: A passive tube (208) is rotatably mounted inside the connecting sleeve (201). A circulation plate (210) is fixedly mounted on the outer surface of the passive tube (208). Multiple output holes (209) are opened on the outer surface of the passive tube (208). All the output holes (209) are located above the circulation plate (210). The circulation plate (210) divides the internal space of the connecting sleeve (201) into an independent upper chamber and a lower chamber, so that the fluid inside the connecting sleeve (201) can selectively flow between the two chambers under the control of the circulation plate (210).

8. The gearbox housing vibration durability testing device according to claim 7, characterized in that: A baffle (211) is fixedly installed inside the connecting sleeve (201). The baffle (211) is fitted against the surface of the circulation plate (210). Both the baffle (211) and the circulation plate (210) have through holes (212). A transmission ring (207) is rotatably installed at the bottom end of the connecting sleeve (201). The transmission ring (207) is fixedly connected to the bottom end of the passive tube (208), so that the transmission ring (207) can drive the passive tube (208) to rotate synchronously. The passive tube (208) and the center tube (206) are connected. The rotating connection ensures that the core tube (206) and the passive tube (208) remain connected during the rotation of the passive tube (208). A spindle (202) is fixedly installed on the surface of the transmission ring (207). The center of gravity of the spindle (202) is offset from its own rotation center, so that the spindle (202) forms an eccentric structure. When the connecting sleeve (201) vibrates with the gearbox (4), the spindle (202) will swing randomly under the action of gravity and vibration inertia, and drive the transmission ring (207) and the passive tube (208) to rotate synchronously.

9. The gearbox housing vibration durability testing device according to claim 5, characterized in that: A transmission sleeve (302) is fixedly installed on the surface of the counterweight disc (301). A movable plug (307) is slidably installed inside the transmission sleeve (302). The movable plug (307) is connected to the transmission sleeve (302) by a return spring (308), so that the movable plug (307) can move axially back and forth inside the transmission sleeve (302). A passive sleeve (306) is fixedly installed above the support frame (304). The passive sleeve (306) is rotatably connected to the transmission sleeve (302). A one-way valve (205) is fixedly connected to the surface of the return cylinder (203). The one-way valve (205) only allows fluid to enter the interior of the return cylinder (203).

10. A method of using a gearbox housing vibration durability testing device, for use with any one of claims 1-9, characterized in that, Includes the following steps: S1: When the auxiliary bladder (110) moves up and down with the buffer sleeve (106) and is continuously compressed and released, the fluid medium inside the auxiliary bladder (110) is periodically squeezed. During the compression process of the auxiliary bladder (110), the internal fluid enters the water distributor (109) through the connecting pipe (105) and is transported to the inside of the connecting sleeve (201) through the diversion pipe (204) and the central pipe (206), so that the fluid pressure acts on the chamber above the circulation plate (210); S2: When the through holes (212) on the surfaces of the circulation plate (210) and the baffle (211) are in a corresponding communication state, the fluid in the upper chamber of the circulation plate (210) enters the lower chamber of the circulation plate (210) through the through holes (212), and is further transported to the inside of the passive sleeve (306) through the return pipe (305) located inside the support frame (304). Under the action of fluid pressure, the movable plug (307) overcomes the elastic force of the return spring (308) and moves along the inside of the transmission sleeve (302). When the movable plug (307) moves to the predetermined position, the input pipe (309) is connected to the left chamber of the movable plug (307). At this time, the fluid medium enters the inside of the auxiliary cylinder (303) through the input pipe (309), causing the pressure inside the auxiliary cylinder (303) to gradually increase. S3: As the internal pressure of the auxiliary cylinder (303) increases, the counterweight (310) is subjected to fluid pressure and moves away from the auxiliary cylinder (303). Due to the change in the position of the counterweight (310), the mass distribution of the counterweight disc (301) changes during rotation, thereby causing the counterweight disc (301) to generate unstable vibration disturbance during rotation, so as to simulate the dynamic vibration caused by load changes during the actual operation of the gearbox (4). S4: When the auxiliary bladder (110) is released and returns to its original shape, the fluid pressure inside the connecting sleeve (201) decreases, and the return pipe (305) located outside the support frame (304) forms a return effect on the right chamber of the movable plug (307), causing the movable plug (307) to reset under the action of pressure change and return spring (308). At the same time, the fluid inside the auxiliary cylinder (303) returns, causing the counterweight (310) to move towards the auxiliary cylinder (303), and the mass distribution of the counterweight plate (301) gradually returns to a stable state.

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