A gearbox and powertrain and vehicle

Abstract

The utility model relates to vehicle field discloses a gearbox, including gearbox casing and set up in the pump motor of gearbox casing, still include connecting assembly and support subassembly, wherein, connecting assembly includes connecting bush and bush cover, and connecting bush is made of composite material, support subassembly includes fixed shaft. The both ends of fixed shaft are equipped with connecting bush, and connecting bush and fixed shaft are interference fit, guarantee the reliable connection of pump motor and gearbox casing, and the dismounting operation of pump motor and other internal parts is simultaneously facilitated, improves the assembly operation convenience of gearbox, and the maintenance difficulty of gearbox is reduced. Meanwhile, connecting bush is made of composite material, and connecting bush can produce elastic deformation, in the working process of gearbox, connecting bush can produce elastic deformation to buffer vibration impact, enhance the damping performance of gearbox, and effectively protect pump motor and other internal parts, the utility model discloses further provide a power system and vehicle.

Description

Technical Field

[0001] This utility model relates to the field of vehicle and component technology, and in particular to a gearbox, power system and vehicle. Background Technology

[0002] The gearbox is one of the core components of a vehicle's powertrain. It is mainly used to change engine speed and torque, and to control the transmission between the output shaft and the input shaft through different gear ratios to adapt to the needs of the vehicle under different driving conditions.

[0003] In the field of transmissions, the ease of machining the gearbox housing and the convenience of disassembling and assembling internal components are crucial to its maintenance efficiency and long-term reliability. However, existing integrated transmission housings have significant shortcomings: on the one hand, their complex structure makes casting and machining difficult, and the unreasonable design of the installation and connection methods of key components (such as gears, pumps, and motors) makes the disassembly and assembly process cumbersome and difficult, not only consuming a lot of time and labor costs, but also easily damaging components during disassembly and assembly; on the other hand, the vibration damping performance of traditional structures is poor, and vibration transmission problems are prominent. Long-term use can easily lead to failures such as loose connections between components, thereby affecting the overall reliability and service life of the transmission.

[0004] Therefore, there is an urgent need for an internal suspension structure for transmissions that can effectively solve the problem of inconvenient disassembly and assembly of internal components and has good vibration damping effect, so as to meet the industry's higher requirements for the ease of disassembly and assembly and the reliability of use of transmissions. Utility Model Content

[0005] The purpose of this utility model is to provide a transmission, power system, and vehicle to solve the problems existing in the above-mentioned related technologies, improve the convenience of disassembly and assembly of internal components of the transmission, reduce the maintenance difficulty of the transmission, enhance the vibration damping performance of the transmission, improve the working reliability of the transmission and vehicle power system, and extend the service life of the transmission and power system.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a gearbox, including a gearbox housing and a pump motor disposed within the gearbox housing, and further comprising: A connecting assembly, the connecting assembly including a connecting bushing and a bushing cover, the connecting bushing being made of a composite material; A support assembly includes a fixed shaft detachably connected to the housing of the pump motor; the pump motor is suspended and mounted within the gearbox housing via the fixed shaft; both ends of the fixed shaft are fitted with connecting bushings, and the fixed shaft and the connecting bushings are interference-fitted; both ends of the fixed shaft extend into pre-set holes in the gearbox housing; when the gearbox is operating, the connecting bushings can undergo elastic deformation; a bushing cover is fitted over the end of the connecting bushing furthest from the pump motor.

[0007] Preferably, the fixed shaft includes a first fixed shaft and a second fixed shaft, both of which are disposed within the gearbox housing. The housing of the pump motor has a first mounting hole adapted to the first fixed shaft, and the first fixed shaft is connected to the pump motor via the first mounting hole. The housing of the pump motor has a second mounting hole adapted to the second fixed shaft, and the second fixed shaft is connected to the pump motor via the second mounting hole. Both ends of the first fixed shaft and the second fixed shaft are fitted with the connecting bushings and extend into the preset holes of the gearbox housing.

[0008] Preferably, the first fixed shaft and the first mounting hole, and the second fixed shaft and the second mounting hole are both connected by locking bolts and locking nuts; The first mounting hole has a notch, and there are locking plates on both sides of the notch. The locking plates have bolt holes that match the locking bolts. The locking bolts pass through the bolt holes of the two locking plates and are threadedly connected to the locking nuts. The locking bolts and the locking nuts cooperate to press the two locking plates together to fix the relative position of the first fixing shaft and the first mounting hole. The structure of the second mounting hole is the same as that of the first mounting hole.

[0009] Preferably, there are two of each of the first mounting holes and the second mounting hole; The notches of both the first mounting hole and the second mounting hole face away from the housing of the pump motor.

[0010] Preferably, the connecting bushing includes a bushing steel sleeve, an elastic bushing, a bushing washer, and a bushing gasket. Both the bushing steel sleeve and the elastic bushing are cylindrical structures. The bushing steel sleeve is embedded inside the elastic bushing. The bushing washer and the bushing gasket are both sleeved on the outside of the bushing steel sleeve and embedded inside the elastic bushing. The bushing washer and the bushing gasket are located at opposite axial ends of the bushing steel sleeve. The elastic bushing is made of an elastic material.

[0011] Preferably, the elastic bushing has a stepped structure, the bushing washer is embedded in the boss section of the elastic bushing, and the bushing gasket is embedded in the other end of the elastic bushing.

[0012] Preferably, the bushing steel sleeve, the bushing washer, and the bushing gasket are all made of carbon steel, and the elastic bushing is made of rubber.

[0013] Preferably, the interference fit between the connecting bushing and the fixed shaft is 0.01mm to 0.03mm.

[0014] This utility model also provides a power system, including the aforementioned gearbox.

[0015] This utility model also provides a vehicle including the aforementioned power system.

[0016] This utility model achieves the following technical effects compared to related technologies: The gearbox of this utility model includes a gearbox housing and a pump motor disposed within the gearbox housing, and also includes a connecting assembly and a supporting assembly. The connecting assembly includes a connecting bushing and a bushing cover, and the connecting bushing is made of composite material. The supporting assembly includes a fixed shaft, which is detachably connected to the housing of the pump motor. The pump motor is suspended and installed within the gearbox housing by the fixed shaft. Both ends of the fixed shaft are fitted with connecting bushings, and the fixed shaft and the connecting bushings are interference-fitted. Both ends of the fixed shaft extend into pre-set holes in the gearbox housing. When the gearbox is working, the connecting bushing can undergo elastic deformation. The bushing cover is fitted onto the outside of the connecting bushing at the end away from the pump motor.

[0017] This utility model discloses a gearbox in which the pump motor is suspended and mounted within the gearbox housing via a fixed shaft. The fixed shaft and the pump motor housing are detachably connected. Connecting bushings are fitted at both ends of the fixed shaft, with an interference fit between the bushings and the fixed shaft. The bushings extend into pre-drilled holes in the gearbox housing, ensuring a reliable connection between the pump motor and the fixed shaft. This provides stable support for the pump motor and other internal components, guaranteeing the structural stability of the gearbox. Furthermore, the assembly and disassembly of the pump motor, fixed shaft, and connecting bushings facilitate the removal and installation of internal components such as the pump motor, improving the ease of assembly and reducing maintenance difficulty. The interference fit between the connecting bushings and the fixed shaft further ensures the reliability of the connection between the fixed shaft and the pump motor. Additionally, the connecting bushings are made of composite material and are capable of elastic deformation. During gearbox operation, the connecting bushings undergo elastic deformation to buffer vibration and impact, enhancing the gearbox's vibration damping performance, providing effective protection for internal components such as the pump motor, improving the gearbox's operational reliability, and extending its service life. In addition, the connecting assembly also includes a bushing cover, which is fitted over the end of the connecting bushing to protect the connecting bushing and seal the gap between the connecting bushing and the gearbox housing, further ensuring the reliability of the connection between the fixed shaft and the connecting bushing and the gearbox housing.

[0018] This utility model also provides a power system and a vehicle, including the aforementioned gearbox. Naturally, the power system and vehicle of this utility model can achieve the aforementioned beneficial effects. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the disassembly structure of the gearbox disclosed in the embodiment of this utility model; Figure 2 This is a schematic diagram of the connection and installation of the gearbox disclosed in the embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the connecting bushing of the gearbox disclosed in the embodiment of this utility model.

[0021] In the diagram: 1. Locking nut; 2. Bushing cover; 3. Connecting bushing; 301. Bushing steel sleeve; 302. Elastic bushing; 303. Bushing gasket; 304. Bushing washer; 4. Locking bolt; 5. First fixed shaft; 6. Second fixed shaft. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] The purpose of this utility model is to provide a transmission, power system, and vehicle to solve the problems existing in the above-mentioned related technologies, improve the convenience of disassembly and assembly of internal components of the transmission, reduce the maintenance difficulty of the transmission, enhance the vibration damping performance of the transmission, improve the working reliability of the transmission and vehicle power system, and extend the service life of the transmission and power system.

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1 This embodiment provides a gearbox; please refer to [reference needed]. Figures 1-3 The system includes a gearbox housing and a pump motor disposed within the gearbox housing, as well as a connecting assembly and a supporting assembly. The connecting assembly includes a connecting bushing 3 and a bushing cover 2, wherein the connecting bushing 3 is made of composite material; the supporting assembly includes a fixed shaft, which is detachably connected to the housing of the pump motor; the pump motor is suspended and mounted within the gearbox housing via the fixed shaft; both ends of the fixed shaft are fitted with connecting bushings 3, and the connecting bushings 3 are interference-fitted with the fixed shaft, with both ends of the fixed shaft extending into pre-set holes in the gearbox housing; when the gearbox is operating, the connecting bushing 3 can undergo elastic deformation; the bushing cover 2 is fitted onto the outside of the connecting bushing 3 at the end away from the pump motor.

[0026] The transmission of this invention features a pump motor suspended within the transmission housing via a fixed shaft. The fixed shaft and the pump motor housing are detachably connected. Connecting bushings 3 are fitted at both ends of the fixed shaft, with an interference fit between the bushings 3 and the fixed shaft. The bushings 3 extend into pre-drilled holes in the transmission housing, ensuring a reliable connection between the pump motor and the housing. This provides stable support for the pump motor and other internal components, guaranteeing the structural stability of the transmission. Furthermore, the assembly and disassembly of the pump motor, fixed shaft, and connecting bushings 3 facilitates the removal and installation of internal components, improving ease of assembly and reducing maintenance difficulty. The interference fit between the connecting bushings 3 and the fixed shaft further ensures the reliability of the connection between the fixed shaft and the pump motor. Additionally, the connecting bushings 3 are made of composite material and are capable of elastic deformation. During transmission operation, these elastic deformations buffer vibrations and impacts, enhancing the transmission's vibration damping performance, providing effective protection for internal components such as the pump motor, improving the transmission's operational reliability, and extending its service life. In addition, the connecting assembly also includes a bushing cover 2, which is fitted onto the end of the connecting bushing 3 to protect the connecting bushing 3 and seal the gap between the connecting bushing 3 and the gearbox housing, further ensuring the reliability of the connection between the fixed shaft and the connecting bushing 3 and the gearbox housing.

[0027] In this specific embodiment, the fixed shaft includes a first fixed shaft 5 and a second fixed shaft 6, both of which are disposed within the gearbox housing. The pump motor housing has a first mounting hole adapted to the first fixed shaft 5, and the first fixed shaft 5 is connected to the pump motor via the first mounting hole. The pump motor housing has a second mounting hole adapted to the second fixed shaft 6, and the second fixed shaft 6 is connected to the pump motor via the second mounting hole. The support assembly is connected to the pump motor housing via the first fixed shaft 5 and the second fixed shaft 6, thereby connecting the pump motor housing to the gearbox housing and providing stable support for the pump motor, ensuring the structural stability of the pump motor and other components within the gearbox. Simultaneously, the fixed shaft, including the first fixed shaft 5 and the second fixed shaft 6, is located at both ends of the pump motor, providing stable support while improving the uniformity of force distribution on the pump motor, further ensuring the structural stability of the pump motor.

[0028] Correspondingly, both ends of the first fixed shaft 5 and the second fixed shaft 6 are fitted with connecting bushings 3 and extend into the preset holes of the gearbox housing. When the gearbox is working, the connecting bushings 3 can produce elastic deformation to absorb the vibration energy of the machine during operation, and prevent the vibration from being directly transmitted to the connection between the first fixed shaft 5 and the second fixed shaft 6 and the gearbox housing, thereby effectively protecting the internal components of the gearbox, improving the working reliability of the gearbox, and extending the service life of the gearbox.

[0029] Specifically, the first fixed shaft 5 and the first mounting hole, and the second fixed shaft 6 and the second mounting hole are all connected by locking bolts 4 and locking nuts 1. The bolt connection makes the connection fast and easy to disassemble and assemble. While ensuring stable support for the pump motor, it also improves the ease of disassembly and assembly of internal components of the gearbox, reduces the difficulty of maintenance of the gearbox, and improves the adaptability of the gearbox.

[0030] More specifically, the first mounting hole has a notch, and there are locking plates on both sides of the notch. The locking plates have bolt holes that match the locking bolts 4. After the locking bolts 4 pass through the bolt holes of the two locking plates, they are threadedly connected to the locking nuts 1. The locking bolts 4 and the locking nuts 1 cooperate to press the two locking plates together, thereby fixing the relative position of the first fixed shaft 5 and the first mounting hole. The notch in the first mounting hole allows the first fixed shaft 5 to pass through the first mounting hole easily. After the connecting bushings 3 at both ends of the first fixed shaft 5 are assembled, the locking bolts 4 pass through the bolt holes of the locking plates and are threadedly connected to the locking nuts 1. The locking bolts 4 and the locking nuts 1 cooperate to press the two locking plates together, compressing the size of the notch in the first mounting hole, thereby fixing the relative position of the first mounting hole and the first fixed shaft 5, and achieving a stable connection between the first fixed shaft 5 and the housing of the pump motor. The two locking plates are fastened by a structure of locking bolt 4 and locking nut 1, which makes the connection and disassembly convenient. In addition, the first mounting hole has a notch structure, which reduces the processing and manufacturing difficulty of the first mounting hole and the first fixed shaft 5.

[0031] Correspondingly, the structure of the second mounting hole is the same as that of the first mounting hole. The second fixed shaft 6 and the second mounting hole are also connected stably and reliably using locking bolts 4 and locking nuts 1, ensuring the stability of the connection between the second fixed shaft 6 and the housing of the pump motor.

[0032] In this specific embodiment, there are two first mounting holes and two second mounting holes, and the line connecting the two first mounting holes and the two second mounting holes is a rectangle. This improves the uniformity of force on the first fixed shaft 5, the second fixed shaft 6 and the pump motor, further ensuring the structural stability of the internal components of the gearbox. Under the premise of convenient disassembly and maintenance operations, it improves the working reliability of the gearbox and extends the service life of the gearbox.

[0033] It should also be noted that, in this specific embodiment, the notches of the first mounting hole and the second mounting hole are both facing the side away from the housing of the pump motor, and the locking plate is also located on the side of the first mounting hole and the second mounting hole away from the housing of the pump motor, providing operating space for the first fixed shaft 5 and the second fixed shaft 6 to connect with the first mounting hole and the second mounting hole, further ensuring the convenience of disassembly and assembly of the components inside the gearbox.

[0034] Furthermore, the connecting bushing 3 includes a bushing steel sleeve 301, an elastic bushing 302, a bushing washer 304, and a bushing gasket 303. Both the bushing steel sleeve 301 and the elastic bushing 302 are cylindrical structures. The bushing steel sleeve 301 is embedded inside the elastic bushing 302. The bushing washer 304 and the bushing gasket 303 are both sleeved on the outside of the bushing steel sleeve 301 and embedded inside the elastic bushing 302. The bushing washer 304 and the bushing gasket 303 are located at the two axial ends of the bushing steel sleeve 301, respectively. The elastic bushing 302 is made of elastic material. The connecting bushing 3 of this utility model is made of composite material. An elastic bushing 302 is disposed outside the bushing steel sleeve 301. While providing the connecting bushing 3 with a certain elastic deformation capacity, it also ensures the structural strength of the connecting bushing 3, thereby effectively guaranteeing the structural strength of the connection between the fixed shaft and the gearbox housing. Simultaneously, the elastic bushing 302 absorbs vibration and impact, enhancing the gearbox's vibration damping performance and improving its structural stability and operational reliability. Bushing washers 304 and bushing shims 303 are fitted at both axial ends of the bushing steel sleeve 301, and both bushing washers 304 and bushing shims 303 are embedded within the elastic bushing 302, further enhancing the structural strength of the connecting bushing 3.

[0035] In this specific embodiment, the elastic bushing 302 has a stepped structure, with a bushing washer 304 embedded in the boss section of the elastic bushing 302 and a bushing gasket 303 embedded at the other end of the elastic bushing 302. The connecting bushing 3 has a stepped structure to accommodate the pre-drilled hole in the gearbox housing, while also limiting the axial position of the connecting bushing 3, ensuring the connection stability between the connecting bushing 3 and the fixed shaft and the gearbox housing. Bushing washers 304 and bushing gaskets 303 are provided at both axial ends of the connecting bushing 3, and both are embedded within the elastic bushing 302. This further ensures the structural strength and stability of the connecting bushing 3 without affecting its vibration damping performance. The bushing cover 2 also has a stepped structure to accommodate the connecting bushing 3. The bushing cover 2 is fitted onto the end of the connecting bushing 3 furthest from the inside of the gearbox housing, enclosing the connecting bushing 3 and preventing damage, further improving the operational reliability of the connecting bushing 3.

[0036] In practical applications, the bushing steel sleeve 301, bushing washer 304, and bushing gasket 303 are all made of carbon steel, which has good mechanical properties. The elastic bushing 302 is made of rubber, such as nitrile rubber, to enhance the buffering and vibration reduction effect of the connecting bushing 3. In practical applications, appropriate materials can be selected according to the actual working conditions to meet the different gearbox working requirements.

[0037] The interference fit between the connecting bushing 3 and the fixed shaft further ensures the reliability of the connection between the fixed shaft and the pump motor. In this specific embodiment, the interference fit between the connecting bushing 3 and the fixed shaft is 0.01mm~0.03mm. In practical applications, the interference fit can be adjusted according to the actual working conditions and component specifications.

[0038] During gearbox assembly, the connecting bushing 3 is first pressed onto the outer walls of the first fixed shaft 5 and the second fixed shaft 6, then the bushing cover 2 is fitted. Subsequently, the assembled fixed shaft is inserted into the corresponding mounting hole of the pump motor housing. A notch is left on the side of the pump motor unit mounting hole, and the locking bolt 4 is installed into the corresponding mounting hole. The notch is tightened by the threaded connection with the locking nut 1, locking the position of the mounting hole and the fixed shaft. In this specific embodiment, the tightening torque of the locking bolt 4 is controlled within the range of 98 N·m to 123 N·m, with a target tightening torque of 112.7 N·m.

[0039] When tightening the locking bolt 4, a "diagonal tightening" method can be used, tightening in two rounds (applying 50% to 70% torque first), and markings should be made to avoid uneven force on the fixed shaft.

[0040] Example 2 This embodiment provides a gearbox, and the following operations are performed during gearbox assembly: Visual inspection: Check that the bushing cover 2 is free from cracks and deformation, the connecting bushing 3 is free from extrusion and damage, and the locking bolt 4 and locking nut 1 are free from stripping and deformation.

[0041] Dimensional inspection: Use calipers to measure the distance between the pump motor shaft and the reference surface of the gearbox housing, with the error controlled within ±0.1mm to ensure accurate installation position.

[0042] Vibration test: The assembled gearbox was installed on the tractor and vibration tests were conducted under three operating conditions: idle speed (750 r / min), medium speed (1500 r / min), and high speed (2200 r / min). Vibration sensors were used to measure the vibration acceleration at the connection between the pump motor and the gearbox housing. The test results showed that the vibration acceleration was ≤0.5g, which is more than 58% better than the rigid connection in the existing technology (vibration acceleration 1.2g). Here, g is the acceleration due to gravity.

[0043] Reliability testing: A 1000-hour bench durability test (simulating tractor field operation conditions) was conducted. After the test, the parts were disassembled and inspected. The fixed shaft was not bent, the connecting bushing 3 had no obvious wear (wear amount ≤0.1mm), the locking bolt 4 and the locking nut 1 were not loose, and there was no abnormal wear at the connection parts, which met the reliability requirements of the gearbox.

[0044] It is also important to note that: Before pressing, a thin layer of silicone-based grease should be applied to the inner wall of the connecting bushing 3 to reduce damage to the connecting bushing 3 during the pressing process and improve the aging resistance of the connecting bushing 3.

[0045] When tightening the locking bolt 4, ensure that the torque wrench is calibrated (calibration error ≤ ±3%) to avoid loosening due to insufficient torque or breakage of the locking bolt 4 due to excessive torque.

[0046] Before the first use of the assembled gearbox, the clearance between the bushing cover 2 and the gearbox housing and pump motor must be checked to ensure there is no interference and to avoid abnormal noise during operation.

[0047] The other structures of the gearbox in this embodiment are the same as those in Embodiment 1, and will not be described again here.

[0048] Example 3 This embodiment provides a power system, including a gearbox as described in Embodiment 1 or Embodiment 2.

[0049] The power system in this embodiment uses the gearbox of Embodiment 1 or Embodiment 2, which can effectively enhance the vibration reduction performance of the gearbox and ensure the reliability of the power system.

[0050] Example 4 This embodiment provides a vehicle, including the power system of Embodiment 3, which can effectively extend the service life of the vehicle and reduce the difficulty of vehicle maintenance.

[0051] The vehicle in this embodiment can be a tractor or other type of vehicle.

[0052] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A gearbox, comprising a gearbox housing and a pump motor disposed within the gearbox housing, characterized in that, Also includes: A connecting assembly, the connecting assembly including a connecting bushing and a bushing cover, the connecting bushing being made of a composite material; A support assembly includes a fixed shaft detachably connected to the housing of the pump motor; the pump motor is suspended and mounted within the gearbox housing via the fixed shaft; both ends of the fixed shaft are fitted with connecting bushings, and the fixed shaft and the connecting bushings are interference-fitted; both ends of the fixed shaft extend into pre-set holes in the gearbox housing; when the gearbox is operating, the connecting bushings can undergo elastic deformation; a bushing cover is fitted over the end of the connecting bushing furthest from the pump motor.

2. The gearbox according to claim 1, characterized in that: The fixed shaft includes a first fixed shaft and a second fixed shaft, both of which are disposed within the gearbox housing. The housing of the pump motor has a first mounting hole adapted to the first fixed shaft, and the first fixed shaft is connected to the pump motor via the first mounting hole. The housing of the pump motor has a second mounting hole adapted to the second fixed shaft, and the second fixed shaft is connected to the pump motor via the second mounting hole. Both ends of the first fixed shaft and the second fixed shaft are fitted with the connecting bushings and extend into the preset holes of the gearbox housing.

3. The gearbox according to claim 2, characterized in that: The first fixed shaft and the first mounting hole, and the second fixed shaft and the second mounting hole are both connected by locking bolts and locking nuts; The first mounting hole has a notch, and there are locking plates on both sides of the notch. The locking plates have bolt holes that match the locking bolts. The locking bolts pass through the bolt holes of the two locking plates and are threadedly connected to the locking nuts. The locking bolts and the locking nuts cooperate to press the two locking plates together to fix the relative position of the first fixing shaft and the first mounting hole. The structure of the second mounting hole is the same as that of the first mounting hole.

4. The gearbox according to claim 3, characterized in that: The number of the first mounting hole and the number of the second mounting hole are both two; The notches of both the first mounting hole and the second mounting hole face away from the housing of the pump motor.

5. The gearbox according to any one of claims 1-4, characterized in that: The connecting bushing includes a bushing steel sleeve, an elastic bushing, a bushing washer, and a bushing gasket. Both the bushing steel sleeve and the elastic bushing are cylindrical structures. The bushing steel sleeve is embedded inside the elastic bushing. The bushing washer and the bushing gasket are both sleeved on the outside of the bushing steel sleeve and embedded inside the elastic bushing. The bushing washer and the bushing gasket are located at opposite axial ends of the bushing steel sleeve. The elastic bushing is made of an elastic material.

6. The gearbox according to claim 5, characterized in that: The elastic bushing has a stepped structure, the bushing washer is embedded in the boss section of the elastic bushing, and the bushing gasket is embedded in the other end of the elastic bushing.

7. The gearbox according to claim 5, characterized in that: The bushing steel sleeve, the bushing washer, and the bushing gasket are all made of carbon steel, and the elastic bushing is made of rubber.

8. The gearbox according to any one of claims 1-4, characterized in that: The interference fit between the connecting bushing and the fixed shaft is 0.01mm~0.03mm.

9. A power system, characterized in that: Includes the gearbox as described in any one of claims 1-8.

10. A vehicle, characterized in that: Includes the power system as described in claim 9.

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