Gearbox and working machine

Abstract

The application relates to the technical field of gearboxes, and discloses a gearbox and a working machine. The gearbox comprises a box body, an input assembly, a transmission assembly, an output assembly and a driving assembly. The input assembly comprises an input shaft and a driving gear, the driving gear is connected with the input shaft, the transmission assembly is in transmission cooperation with the driving gear, the output assembly comprises an output shaft, a first driven gear, a second driven gear and a sliding piece, the first driven gear and the second driven gear are in transmission cooperation with the transmission assembly and are rotationally connected with the output shaft, the sliding piece is at least partially connected with the output shaft and is in sliding cooperation with the output shaft, and the driving assembly drives the sliding piece to slide, so that the sliding piece is partially connected with the first driven gear or the second driven gear, and the first driven gear or the second driven gear drives the output shaft to rotate. The gearbox of the application can realize gear shifting only by driving the sliding piece to slide, the structure is simple, and the manufacturing cost of the gearbox can be saved.

Description

Technical Field

[0001] This invention relates to the field of gearbox technology, and more specifically to a gearbox and a working machine. Background Technology

[0002] The gearbox is the core component of the transmission system of working machinery. Its function is to transmit the power from the power source to the walking system after speed change, so as to achieve matching and adjustment of driving torque and driving speed.

[0003] In existing technologies, transmissions generally adopt a hybrid structure that couples fixed-axis reduction, planetary gear set and clutch. The fixed-axis gear system undertakes the basic reduction ratio configuration, the planetary gear set uses its multi-degree-of-freedom characteristics to realize power splitting and synthesis, and multiple clutches control the power on and off of each transmission path by switching between engagement and disengagement, thereby realizing the function of multi-gear shifting.

[0004] However, the large number of parts and complex assembly relationships within the aforementioned gearboxes result in high manufacturing costs. Summary of the Invention

[0005] This invention provides a gearbox and a working machine to solve the problems of existing gearboxes having complex structures and high manufacturing costs.

[0006] In a first aspect, the present invention provides a gearbox for a working machine, comprising: a housing; an input assembly including an input shaft and a drive gear, the input shaft being rotatably disposed on the housing and for connection to a drive device of the working machine, the drive gear being connected to the input shaft; a transmission assembly engaging with the drive gear; an output assembly including an output shaft, a first driven gear, a second driven gear, and a sliding member; the output shaft being rotatably disposed on the housing, the first driven gear and the second driven gear both engaging with the transmission assembly; the first driven gear and the second driven gear both being rotatably connected to the output shaft, the sliding member being disposed between the first driven gear and the second driven gear, the sliding member being at least partially connected to the output shaft, and the sliding member engaging with the output shaft; and a drive assembly configured to drive the sliding member to slide relative to the output shaft, such that the sliding member is partially connected to the first driven gear or the second driven gear, thereby causing the first driven gear or the second driven gear to drive the output shaft to rotate.

[0007] According to the above-mentioned technical means, the drive device of the operating machinery drives the input shaft to rotate, the input shaft drives the drive gear to rotate, and the drive gear drives the first driven gear and the second driven gear to rotate through the transmission assembly. Both the first driven gear and the second driven gear are rotatably connected to the output shaft. When the sliding member is not connected to either the first or the second driven gear, the output shaft remains stationary, and both the first and second driven gears rotate relative to the output shaft. When the drive assembly drives the sliding member to partially connect with the first driven gear, the sliding member simultaneously connects to both the output shaft and the first driven gear. Therefore, the first driven gear can drive the output shaft to rotate through the sliding member. Similarly, when the sliding member is partially connected to the second driven gear, the second driven gear can drive the output shaft to rotate through the sliding member. Different diameters of the first and second driven gears or different transmission paths of the transmission assembly can cause the first and second driven gears to rotate at different speeds. The output shaft then moves at the same speed as either the first or the second driven gear depending on the position of the sliding member, thereby realizing the shifting of gears in the gearbox.

[0008] Therefore, the gearbox of this application can achieve gear shifting without the need for a clutch or other structures, simplifying the assembly process and reducing the gearbox's structure and manufacturing cost. Furthermore, since the output shaft rotates at a lower speed than the input shaft, placing the sliding element on the output shaft, rather than on the input shaft, reduces the precision requirements for gear shift control, thus lowering the gearbox's failure rate and saving on maintenance costs.

[0009] In one optional embodiment, the transmission assembly includes a first transmission shaft, a second transmission shaft, a first transmission gear, a second transmission gear, a third transmission gear, and a fourth transmission gear; the first transmission shaft and the second transmission shaft are both rotatably disposed within the housing, the first transmission gear and the second transmission gear are both connected to the first transmission shaft, and the third transmission gear and the fourth transmission gear are both connected to the second transmission shaft; the first transmission gear meshes with the driving gear, the second transmission gear meshes with the third transmission gear, the third transmission gear meshes with the first driven gear, and the fourth transmission gear meshes with the second driven gear.

[0010] In this way, the drive unit drives the input shaft to rotate, which in turn drives the drive gear. The drive gear, through a first transmission gear, drives the first transmission shaft to rotate. The first transmission shaft, through a second transmission gear, drives the third transmission gear to rotate. On one hand, the third transmission gear drives the first driven gear to rotate; on the other hand, the third transmission gear, through a second transmission shaft, drives the fourth transmission gear to rotate. The fourth transmission gear then drives the second driven gear to rotate. This creates two gears, with a simple and clear transmission path that satisfies the gear requirements of the transmission while simplifying the internal transmission structure and improving the reliability of the transmission.

[0011] In one optional embodiment, the output assembly further includes a first bearing and a second bearing; the first bearing and the second bearing are sleeved on the output shaft, the first driven gear is rotatably connected to the output shaft through the first bearing, and the second driven gear is rotatably connected to the output shaft through the second bearing.

[0012] Thus, by setting up the first and second bearings, the first and second driven gears can rotate freely relative to the output shaft. They only connect to the output shaft to transmit torque when connected to the sliding element. This helps prevent dragging losses of the second or first driven gear in first or second gear, reducing wear and extending the service life of the output components. Furthermore, setting up the first and second bearings also improves the meshing state of the first and second driven gears, reducing shift shock and noise, and improving the durability and reliability of the transmission.

[0013] In one optional embodiment, the slider has internal teeth, and the output shaft has external teeth; the internal teeth at least partially mesh with the external teeth, and the length of the external teeth along the axial direction of the output shaft is greater than or equal to the length of the internal teeth along the axial direction of the output shaft; the first driven gear has a first connecting portion extending toward the slider, and the first connecting portion has a first tooth; the second driven gear has a second connecting portion extending toward the slider, and the second connecting portion has a second tooth; the internal teeth partially mesh with the first tooth or the second tooth, so that the first driven gear or the second driven gear drives the output shaft to rotate through the slider.

[0014] Thus, the length of the external teeth is greater than the length of the internal teeth, ensuring that the external teeth cover the entire stroke range of the internal teeth. This allows the sliding component to move axially without disengaging from the torque transmission of the output shaft, preventing the internal teeth from simultaneously engaging with the first and second teeth and causing malfunctions. This helps reduce the failure rate of the transmission and improve its reliability. Compared to shifting gears through the frictional engagement of a clutch, the engagement of the sliding component with the first or second driven gear in this application is a progressive tooth surface meshing, resulting in lower impact loads, a clear wear mechanism, and mechanical self-locking characteristics in the meshing state. This helps reduce the risk of disengagement and improves the durability and reliability of the transmission.

[0015] In one optional embodiment, the drive assembly includes a drive shaft, a drive member, a bushing, and a shift fork; the sliding member has a connecting groove along its circumference; the drive shaft is disposed within the housing, the bushing is sleeved on the drive shaft and slidably engaged with the drive shaft, one end of the shift fork is connected to the bushing, and the other end of the shift fork is disposed within the connecting groove; the drive member is connected to the housing, and the drive member is configured to drive the bushing to slide relative to the drive shaft, so that the shift fork drives the sliding member to slide relative to the output shaft.

[0016] In this way, the drive shaft remains fixed to the housing, guiding the bushing. The connecting groove is an annular groove to ensure that when the sliding component rotates, the other end of the shift fork is always within the annular groove, preventing the shift fork from disengaging from the sliding component and causing shifting failure, thus improving the reliability of the gearbox.

[0017] In one optional embodiment, the drive shaft is provided with two limiting structures; the two limiting structures are spaced apart along the axial direction of the drive shaft, and the shaft is sleeved between the two limiting structures and is limited and engaged with the limiting structures.

[0018] Thus, by limiting the travel range of the bushing through the limiting structure, the travel of the shift fork is also limited, preventing interference between the shift fork and the first or second driven gear. This helps reduce the failure rate of the transmission and improves its reliability. Furthermore, limiting the travel range of the bushing also limits the travel of the sliding sleeve, ensuring that the sliding component remains at least partially engaged with the output shaft during sliding. This prevents the sliding component from exceeding its travel range and disengaging from the output shaft, which would affect torque transmission and further improve the stability and reliability of the transmission's shifting.

[0019] In one optional embodiment, the output assembly further includes a third bearing, a sealing sleeve, an output flange, a retaining ring, and an oil seal; the third bearing, the sealing sleeve, and the output flange are sequentially fitted onto the output shaft, the output shaft is rotatably connected to the housing via the third bearing, the output flange is used to connect to the actuator of the working machinery, and the sealing sleeve is in sealing fit with both the third bearing and the output flange; the retaining ring is fixedly connected to the housing, the retaining ring is located on the side of the third bearing facing the sealing sleeve, and forms a limiting fit with the third bearing; the oil seal is fitted outside the sealing sleeve, and the oil seal is in sealing fit with both the sealing sleeve and the housing.

[0020] In this way, the third bearing provides rotational support for the output shaft and the housing, while the sealing sleeve forms a sealing fit with both the third bearing and the output flange. This helps prevent external dust and mud from entering the bearing and housing, allowing the machinery to better adapt to complex operating environments and extending the service life of the gearbox and its internal lubricating oil. The retaining ring forms a rigid limiting fit with the third bearing, effectively constraining the displacement trend of the output shaft under axial load, which helps ensure the accuracy and lifespan of the third bearing. Furthermore, the oil seal sleeve, located outside the sealing sleeve, forms a double seal with the housing and the sealing sleeve. The sealing sleeve mainly blocks solid particles and large-diameter contaminants, while the oil seal forms a secondary barrier against lubricating oil and small impurities, improving sealing reliability and enhancing the gearbox's durability under heavy loads, dusty conditions, and other complex operating conditions.

[0021] In one optional embodiment, a lubrication pump is further included, the lubrication pump comprising a rotor assembly; the housing is provided with a lubrication oil passage, the input assembly further comprising a fourth bearing, the two ends of the input shaft being rotatably connected to the housing via the fourth bearing; the lubrication oil passage is arranged parallel to the input shaft and communicates with the oil outlet of the lubrication pump, one of the input shaft, the first drive shaft, and the second drive shaft is connected to the rotor assembly to drive the rotor assembly to rotate, so that the lubrication pump pumps lubricating oil to the lubrication oil passage; the lubrication oil passage has a first throttling orifice and a second throttling orifice, so that the lubricating oil in the lubrication oil passage flows to the fourth bearing through the first throttling orifice and to the drive gear through the second throttling orifice.

[0022] In this way, the rotor assembly of the lubrication pump is connected to the input shaft, the first drive shaft, or the second drive shaft. Thus, the power source of the lubrication pump is the same as that of the gearbox. The lubrication pump starts and stops synchronously with the input assembly, which ensures that the lubrication pump can always pump a sufficient amount of lubricating oil during the operation of the gearbox. This helps to ensure the stability of the gearbox during operation and extend the service life of the gearbox.

[0023] Furthermore, the lubricating oil in the lubrication channels flows out from the first and second throttling orifices and flows to the fourth bearing and the drive gear, thereby completing the lubrication of the output components. Further, after the lubricating oil falls onto the surfaces of the input shaft and the drive gear, under the disturbance of the high rotation of the drive gear and the operation of the shaft system, oil droplet splashing and oil mist dispersion effects are formed. The splashed lubricating oil falls into the shafts and gears of the transmission and output components, thereby achieving indirect lubrication of the transmission and output components. Therefore, the lubrication method combining forced lubrication and splash lubrication in this embodiment of the application is beneficial in ensuring that all components within the transmission are adequately lubricated and cooled while simplifying the oil circuit structure within the transmission, thus reducing the manufacturing and maintenance costs of the transmission.

[0024] In one optional embodiment, the transmission assembly further includes a fifth bearing and a sixth bearing, with both ends of the first transmission shaft rotatably connected to the housing via the fifth bearing; both ends of the second transmission shaft are rotatably connected to the housing via the sixth bearing; the housing has a first oil collection groove and a second oil collection groove, with the first oil collection groove located on the periphery of the fifth bearing and the second oil collection groove located on the periphery of the sixth bearing.

[0025] In this way, the first and second oil collection grooves can directionally collect and converge splashed lubricating oil, forming a local oil pool effect. This ensures that the outer rings of the fifth and sixth bearings are constantly flushed with oil, which helps guarantee the reliability of lubricating oil supply to the fifth and sixth bearings and improves their heat dissipation efficiency. Furthermore, the first and second oil collection grooves are directly formed into the inner wall of the gearbox, eliminating the need for additional oil collection trays or guide pipes. This simplifies the internal spatial layout of the gearbox and improves the overall structural compactness of the transmission.

[0026] In a second aspect, the present invention also provides a working machine, including the gearbox described in any one of the first aspects.

[0027] Based on the aforementioned technical means, by equipping the operating machinery with the aforementioned gearbox, the driver can flexibly control the actions of the operating machinery's actuators, while also helping to reduce the overall manufacturing and maintenance costs of the operating machinery. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the gearbox structure provided in an embodiment of this application; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 A magnified view of a section at point B in the middle; Figure 4 for Figure 1 A magnified view of a section at point C; Figure 5 A schematic diagram of the lubrication pump of the gearbox provided in an embodiment of this application from another angle; Figure 6 A schematic diagram of the transmission principle of the gearbox provided in an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures: 100 - Housing; 110 - Housing body; 111 - Lubricating oil passage; 1111 - First throttling orifice; 1112 - Second throttling orifice; 112 - First oil collecting groove; 113 - Second oil collecting groove; 120 - End cap; 121 - Oil suction pipe; 200 - Input component; 210 - Input shaft; 220 - Drive gear; 230 - Fourth bearing; 300 - Transmission assembly; 310 - First drive shaft; 320 - Second drive shaft; 330 - First drive gear; 340 - Second drive gear; 350 - Third drive gear; 360 - Fourth drive gear; 370 - Fifth bearing; 380 - Sixth bearing; 400 - Output assembly; 410 - Output shaft; 420 - First driven gear; 421 - First bearing; 422 - First connecting part; 4221 - First tooth; 430 - Second driven gear; 431 - Second bearing; 432 - Second connecting part; 4321 - Second tooth; 440 - Sliding element; 441 - Connecting groove; 450 - Third bearing; 460 - Sealing sleeve; 470 - Output flange; 480 - Retaining ring; 490 - Oil seal; 500-Drive assembly; 510-Drive shaft; 511-Limiting structure; 520-Drive component; 521-Snap-fit ​​part; 530-Busset; 531-Slot; 540-Shift fork; 600 - Lubrication pump; 610 - Oil filter element; 700 - Speed ​​sensor; 710 - Speed ​​measuring gear; 800-spacer; 10-Drive device. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0032] As the background section demonstrates, in related technologies, transmissions generally employ a hybrid structure involving fixed-axis reduction, planetary gear sets, and clutches. The fixed-axis gear system handles the basic reduction ratio configuration, while the planetary gear set utilizes its multi-degree-of-freedom characteristics to achieve power splitting and synthesis. Multiple clutches control the power supply and disconnection of each transmission path through engagement and disengagement switching, thereby achieving multi-gear shifting. However, the aforementioned transmissions have a large number of components and complex assembly relationships, resulting in high manufacturing costs.

[0033] In related technologies, some transmissions, in order to improve the above-mentioned problems, have installed a sliding sleeve, a first gear, and a second gear on the input shaft connected to the power source. By controlling the engagement or disengagement of the sliding sleeve with the first and second gears, the power transmission path is changed, and gear switching is achieved. However, the connection between the input shaft and the power source results in a relatively high input shaft speed. When the sliding sleeve rotates at the same speed as the input shaft and slides relative to the input shaft to engage with the first or second gear, the control precision required for the sliding sleeve is extremely high. This can easily lead to failure or significant wear, resulting in a high failure rate and maintenance cost of the transmission.

[0034] To address the aforementioned technical problems, this application provides a gearbox and a working machine. The gearbox includes a housing, an input component, a transmission component, an output component, and a drive component. The drive device of the working machine drives the input shaft to rotate, which in turn drives the drive gear to rotate. The drive gear drives the first driven gear and the second driven gear to rotate via the transmission component. Both the first and second driven gears are rotatably connected to the output shaft. When the sliding member is not connected to either the first or the second driven gear, the output shaft remains stationary, and both the first and second driven gears rotate relative to the output shaft. When the drive component drives the sliding member to partially connect with the first driven gear, the sliding member simultaneously connects to both the output shaft and the first driven gear. Therefore, the first driven gear can drive the output shaft to rotate via the sliding member. Similarly, when the sliding member is partially connected to the second driven gear, the second driven gear can drive the output shaft to rotate via the sliding member. The different diameters of the first driven gear and the second driven gear, or the different transmission paths of the transmission components, can cause the first driven gear and the second driven gear to rotate at different speeds. The output shaft then moves at the same speed as the first driven gear or the second driven gear depending on the position of the sliding member, thereby realizing the switching of gearbox positions.

[0035] Therefore, the gearbox in this embodiment of the application can achieve gear shifting without the need for a clutch or other structures, simplifying the assembly process and reducing the gearbox's structure and manufacturing cost. Furthermore, since the output shaft rotates at a lower speed than the input shaft, placing the sliding member on the output shaft, rather than on the input shaft, reduces the precision requirements for gear shift control, thus lowering the gearbox's failure rate and saving on maintenance costs.

[0036] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0037] According to an embodiment of the present invention, see Figure 1 and Figure 6As shown, in one aspect, a gearbox is provided for use in working machinery, including: a housing 100, an input assembly 200, a transmission assembly 300, an output assembly 400, and a drive assembly 500. The input assembly 200 includes an input shaft 210 and a drive gear 220. The input shaft 210 is rotatably mounted on the housing 100 and is used to connect to the drive device 10 of the working machinery. The drive gear 220 is connected to the input shaft 210. The transmission assembly 300 is in transmission engagement with the drive gear 220. The output assembly 400 includes an output shaft 410, a first driven gear 420, a second driven gear 430, and a sliding member 440. The output shaft 410 is rotatably mounted on the housing 100, the first driven gear 420, the second driven gear 430, and a sliding member 500. Both the driven gear 420 and the second driven gear 430 are in transmission engagement with the transmission assembly 300; both the first driven gear 420 and the second driven gear 430 are rotatably connected to the output shaft 410; a sliding member 440 is disposed between the first driven gear 420 and the second driven gear 430, and the sliding member 440 is at least partially connected to the output shaft 410, and the sliding member 440 is in sliding engagement with the output shaft 410; the drive assembly 500 is configured to drive the sliding member 440 to slide relative to the output shaft 410, so that the sliding member 440 is partially connected to the first driven gear 420 or the second driven gear 430, so that the first driven gear 420 or the second driven gear 430 drives the output shaft 410 to rotate. The input shaft 210 and the output shaft 410 both extend along a first direction, and the input assembly 200, the transmission assembly 300, the output assembly 400, and the drive assembly 500 are arranged sequentially along a second direction. Figure 1 The X direction is the first direction, and the Y direction is the second direction.

[0038] In this embodiment of the application, the drive device 10 of the working machinery can be an electric motor. Compared with engine drive, the electric motor can achieve stepless speed change and has a wide range of speed adjustment capabilities. Therefore, the gearbox does not need to set too many gears to ensure the flexibility of speed adjustment. However, since the high efficiency range of the electric motor is usually concentrated in a specific speed and torque range, the gearbox can be set with a small number of gears for switching, so that the working point of the electric motor always falls in the high efficiency range, which is conducive to reducing energy consumption and extending the service life of the electric motor.

[0039] Therefore, the output component 400 of this application embodiment is provided with a first driven gear 420 and a second driven gear 430. The diameters and transmission paths of the first driven gear 420 and the second driven gear 430 are different. Therefore, the output shaft 410 can be driven by the sliding member 440 to achieve different gear outputs. This can not only meet the needs of gearbox shifting and flexible speed adjustment of working machinery, reduce motor energy consumption, and extend motor service life, but also simplify the structure of the gearbox and reduce the manufacturing and maintenance costs of the gearbox.

[0040] In a specific implementation, the drive device 10 drives the input shaft 210 to rotate, the input shaft 210 drives the drive gear 220 to rotate, and the drive gear 220 drives the first driven gear 420 and the second driven gear 430 to rotate through the transmission assembly 300. Since both the first driven gear 420 and the second driven gear 430 are rotatably connected to the output shaft 410, when the sliding member 440 is separated from both the first driven gear 420 and the second driven gear 430, the first driven gear 420 and the second driven gear 430 rotate relative to the output shaft 410, while the output shaft 410 and the sliding member 440 remain stationary, i.e., the gearbox is in the stop position; when the sliding member 440 is partially connected to the first driven gear 420 and partially connected to the output shaft 410, the output shaft 410 rotates at the same speed as the first driven gear 420, and the gearbox is in the first gear position; when the sliding member 440 is partially connected to the second driven gear 430 and partially connected to the output shaft 410, the output shaft 410 rotates at the same speed as the second driven gear 430, and the gearbox is in the second gear position.

[0041] Therefore, the drive assembly 500 only needs to drive the slider 440 to slide along the axial direction of the output shaft 410 to realize the switching of the gearbox between the stop gear, the first gear and the second gear. The structure is simple and helps to reduce the manufacturing cost of the gearbox.

[0042] Furthermore, when the gearbox shifts from the stop position to the first or second gear, the output shaft 410 is stationary. The rotational speeds of the first driven gear 420 and the second driven gear 430 are both lower than the rotational speed of the input shaft 210. Therefore, when the sliding member 440 slides toward the first driven gear 420 or the second driven gear 430, the control precision requirement for the drive assembly 500 is lower. The probability of wear or failure between the sliding member 440 and the first driven gear 420 or the second driven gear 430 is lower, which helps to improve the reliability of the gearbox, reduce the maintenance cost of the gearbox, and extend the service life of the gearbox.

[0043] Furthermore, when the drive device 10 is a motor, the forward and backward movement of the working machine can be realized by controlling the direction and speed of the motor, and the forward or backward speed of the working machine can be flexibly adjusted. The structure is simple and highly operable.

[0044] The housing 100 may include a housing body 110 and an end cover 120. The housing body 110 and the end cover 120 are detachably connected. One end of the input shaft 210 and the output shaft 410 are rotatably connected to the housing body 110, and the other end is rotatably connected to the end cover 120. This allows the end cover 120 to be quickly removed or installed during gearbox maintenance, improving maintenance efficiency and saving gearbox maintenance costs. Of course, the specific structure of the housing 100 is not limited in this embodiment, as long as it provides sufficient space for the input component 200, the transmission component 300, and the output component 400.

[0045] In one embodiment, see Figure 1 and Figure 6 As shown, the transmission assembly 300 includes a first transmission shaft 310, a second transmission shaft 320, a first transmission gear 330, a second transmission gear 340, a third transmission gear 350, and a fourth transmission gear 360. The first transmission shaft 310 and the second transmission shaft 320 are both rotatably disposed within the housing 100. The first transmission gear 330 and the second transmission gear 340 are both connected to the first transmission shaft 310, and the third transmission gear 350 and the fourth transmission gear 360 are both connected to the second transmission shaft 320. The first transmission gear 330 meshes with the driving gear 220, the second transmission gear 340 meshes with the third transmission gear 350, the third transmission gear 350 meshes with the first driven gear 420, and the fourth transmission gear 360 meshes with the second driven gear 430.

[0046] In a specific implementation, the input shaft 210, the first transmission shaft 310, the second transmission shaft 320, and the output shaft 410 are arranged in parallel. The driving device 10 drives the input shaft 210 to rotate, which in turn drives the drive gear 220 to rotate. The drive gear 220 drives the first transmission shaft 310 to rotate via the first transmission gear 330. The first transmission shaft 310 drives the third transmission gear 350 to rotate via the second transmission gear 340. On one hand, the third transmission gear 350 drives the first driven gear 420 to rotate. On the other hand, the third transmission gear 350 drives the fourth transmission gear 360 to rotate via the second transmission shaft 320. The fourth transmission gear drives the second driven gear 430 to rotate.

[0047] In this configuration, the diameter of the third transmission gear 350 can be set to be larger than the diameter of the fourth transmission gear 360, and the diameter of the first driven gear 420 is smaller than the diameter of the second driven gear 430. Since both the third transmission gear 350 and the fourth transmission gear 360 are connected to the second transmission shaft 320, and the rotational speeds of the third transmission gear 350 and the fourth transmission gear 360 are the same, the rotational speed of the first driven gear 420 is greater than the rotational speed of the second driven gear 430, thus forming two gears. The transmission path is simple and clear, which can not only meet the gear requirements of the gearbox, but also simplify the transmission structure inside the gearbox and improve the reliability of the gearbox.

[0048] In some embodiments, the drive gear 220 and the input shaft 210, the first transmission gear 330 and the second transmission gear 340 and the first transmission shaft 310, and the third transmission gear 350 and the fourth transmission gear 360 can all be integrally formed and fixedly connected, or they can be connected by splines or other structures. This application embodiment does not limit this, as long as it can ensure that the drive gear 220 and the input shaft 210 rotate at the same speed, the first transmission gear 330 and the second transmission gear 340 rotate at the same speed as the first transmission shaft 310, and the third transmission gear 350 and the fourth transmission gear 360 rotate at the same speed as the fourth transmission shaft.

[0049] In one embodiment, see Figure 1 , Figure 2 and Figure 6 As shown, the output assembly 400 also includes a first bearing 421 and a second bearing 431; the first bearing 421 and the second bearing 431 are sleeved on the output shaft 410, the first driven gear 420 is rotatably connected to the output shaft 410 through the first bearing 421, and the second driven gear 430 is rotatably connected to the output shaft 410 through the second bearing 431.

[0050] Understandably, by setting the first bearing 421 and the second bearing 431, the first driven gear 420 and the second driven gear 430 can rotate freely relative to the output shaft 410, and only connect to the output shaft 410 to transmit torque when connected to the sliding member 440. This helps prevent dragging losses of the second driven gear 430 or the first driven gear 420 in the first or second gear position, reduces wear, and thus extends the service life of the output assembly 400. In addition, setting the first bearing 421 and the second bearing 431 also helps improve the meshing state of the first driven gear 420 and the second driven gear 430, reduces shift shock and noise, and improves the durability and reliability of the transmission.

[0051] In one embodiment, see Figure 1 , Figure 2 and Figure 6 As shown, the slider 440 is provided with internal teeth, and the output shaft 410 is provided with external teeth; the internal teeth at least partially mesh with the external teeth, and the length of the external teeth along the axial direction of the output shaft 410 is greater than or equal to the length of the internal teeth along the axial direction of the output shaft 410; the first driven gear 420 is provided with a first connecting portion 422 extending toward the slider 440, and the first connecting portion 422 is provided with a first tooth 4221; the second driven gear 430 is provided with a second connecting portion 432 extending toward the slider 440, and the second connecting portion 432 is provided with a second tooth 4321; the internal teeth partially mesh with the first tooth 4221 or the second tooth 4321, so that the first driven gear 420 or the second driven gear 430 drives the output shaft 410 to rotate through the slider 440.

[0052] It should be noted that the external teeth on the output shaft 410 need to be arranged flush with the first tooth 4221 and the second tooth 4321 along the axial direction of the output shaft 410 to ensure that the internal teeth of the sliding member 440 can form a complete tooth width contact with the corresponding first tooth 4221 or second tooth 4321 at any meshing position. This helps to eliminate the risk of off-center meshing caused by axial misalignment, reduce the requirements for the stroke control accuracy of the sliding member 440, reduce wear, and extend the service life of the gearbox.

[0053] Furthermore, the length of the outer tooth is greater than the length of the inner tooth, which ensures that the outer tooth covers the entire stroke range of the inner tooth. This allows the sliding member 440 to move axially without disengaging from the torque transmission of the output shaft 410, thus preventing the inner tooth from simultaneously meshing with the first tooth 4221 and the second tooth 4321 and causing a failure. This helps to reduce the failure rate of the gearbox and improve its reliability.

[0054] In addition, compared with shifting gears through frictional engagement of a clutch, the engagement between the sliding member 440 and the first driven gear 420 or the second driven gear 430 in this embodiment of the application is a progressive tooth surface meshing, which results in a smaller impact load, a clear wear mechanism, and mechanical self-locking characteristics in the meshing state. This helps to reduce the risk of disengagement and improve the durability and reliability of the transmission.

[0055] In one embodiment, see Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, the drive assembly 500 includes a drive shaft 510, a drive member 520, a bushing 530, and a shift fork 540; a sliding member 440 has a connecting groove 441 in the circumferential direction; the drive shaft 510 is disposed inside the housing 100, the bushing 530 is sleeved on the drive shaft 510 and the bushing 530 is slidably engaged with the drive shaft 510, one end of the shift fork 540 is connected to the bushing 530, and the other end of the shift fork 540 is disposed in the connecting groove 441; the drive member 520 is connected to the housing 100, and the drive member 520 is configured such that the drive bushing 530 slides relative to the drive shaft 510, so that the shift fork 540 drives the sliding member 440 to slide relative to the output shaft 410.

[0056] In specific implementations, the driving component 520 can be a motor, a driving cylinder, etc., and this application embodiment does not limit this, as long as it can drive the bushing 530 to slide relative to the driving shaft 510. The driving shaft 510 is fixedly connected to the housing 100 and remains stationary, serving as a guide for the bushing 530. The connecting groove 441 is an annular groove to ensure that when the sliding component 440 rotates, the other end of the shift fork 540 is always located within the annular groove, preventing the shift fork 540 from disengaging from the sliding component 440, which would lead to shifting failure and improve the reliability of the gearbox.

[0057] Furthermore, a slot 531 can be formed on the bushing 530, and a snap-fit ​​part 521 can be provided at the output end of the drive member 520. The snap-fit ​​part 521 snaps into the slot 531, and the drive member 520 drives the snap-fit ​​part 521 to move axially along the drive shaft 510, thereby causing the bushing 530 to slide along the drive shaft 510. In this way, the bushing 530 and the drive member 520 are detachably connected, and the shift fork 540 and the connecting groove 441 are detachably connected. When the shift fork 540 or the bushing 530 is damaged, it can be replaced separately, which helps to reduce the maintenance cost of the gearbox.

[0058] In one embodiment, see Figure 1 , Figure 2 and Figure 4 As shown, the drive shaft 510 is provided with two limiting structures 511; the two limiting structures 511 are spaced apart along the axial direction of the drive shaft 510, and the bushing 530 is located between the two limiting structures 511 and is limited and engaged with the limiting structures 511.

[0059] It is understandable that when the drive sleeve 530 slides relative to the drive shaft 510, if the sliding stroke of the sleeve 530 exceeds the preset range, the shift fork 540 may interfere with the first driven gear 420 or the second driven gear 430, causing damage to the shift fork 540 and the first driven gear 420 or the second driven gear 430, resulting in a gearbox malfunction. Therefore, two limiting structures 511 can be set to limit the stroke range of the sleeve 530, thereby limiting the stroke of the shift fork 540, thus preventing interference between the shift fork 540 and the first driven gear 420 or the second driven gear 430, which helps to reduce the failure rate of the gearbox and improve its reliability.

[0060] In addition, the travel range of the bushing 530 can be limited to restrict the travel of the sliding sleeve, ensuring that the sliding member 440 always remains at least partially engaged with the output shaft 410 during the sliding process. This prevents the sliding member 440 from exceeding the travel range and disengaging from the output shaft 410, which would affect the transmission of torque and further improve the stability and reliability of the gearbox shifting.

[0061] In one embodiment, see Figure 1 , Figure 2 and Figure 6 As shown, the output assembly 400 also includes a third bearing 450, a sealing sleeve 460, and an output flange 470 sequentially sleeved on the output shaft 410; the output shaft 410 is rotatably connected to the housing 100 through the third bearing 450, the output flange 470 is used to connect to the actuator of the working machinery, and the sealing sleeve 460 is sealed to both the third bearing 450 and the output flange 470.

[0062] In a specific implementation, there are two output flanges 470, respectively located at both ends of the output shaft 410. The third bearing 450 and the sealing sleeve 460 are two corresponding to the output flanges 470. The output flanges 470 can be connected to the walking system or other actuators of the working machinery; this embodiment does not limit this connection. Specifically, the third bearing 450 provides rotational support between the output shaft 410 and the housing 100. The sealing sleeve 460 forms a sealing fit with both the third bearing 450 and the output flanges 470, which helps prevent external dust and mud from entering the bearings and the interior of the housing 100. This allows the working machinery to better adapt to complex working environments and extends the service life of the gearbox and its internal lubricating oil.

[0063] In a practical implementation, a speed sensor 700 can be installed on the housing 100, and one of the sealing sleeves 460 can be replaced with a speed measuring gear 710. That is, the speed measuring gear 710 is located between the third bearing 450 and the output flange 470. An oil seal 490 can also be installed between the speed measuring gear 710 and the housing 100. The internal teeth of the speed measuring gear 710 mesh with the external teeth of the output shaft 410 to rotate at the same speed as the output shaft 410. At the same time, the external teeth of the speed measuring gear 710 mesh with the speed sensor 700. The speed sensor 700 measures the speed of the output shaft 410 through the speed measuring gear 710 and feeds the detection result back to the control system of the working machinery to improve the accuracy of gearbox control.

[0064] In one embodiment, see Figure 1 , Figure 2 and Figure 6 As shown, the output assembly 400 also includes a retaining ring 480 and an oil seal 490; the retaining ring 480 is fixedly connected to the housing 100, and the retaining ring 480 is located on the side of the third bearing 450 facing the sealing sleeve 460, and forms a limiting fit with the third bearing 450; the oil seal 490 is sleeved outside the sealing sleeve 460, and the oil seal 490 is in a sealing fit with both the sealing sleeve 460 and the housing 100.

[0065] Understandably, the retaining ring 480 and oil seal 490 are also two corresponding to the output flange 470. The retaining ring 480 forms a rigid limiting fit with the third bearing 450, effectively constraining the displacement trend of the output shaft 410 under axial load, which is beneficial to ensuring the accuracy and life of the third bearing 450. Furthermore, the oil seal 490 is sleeved outside the sealing sleeve 460 to form a double seal with the housing 100 and the sealing sleeve 460. The sealing sleeve 460 mainly blocks solid particles and large-diameter contaminants, while the oil seal 490 forms a secondary barrier against lubricating oil and small impurities, which is beneficial to improving sealing reliability and thus enhancing the durability of the gearbox under complex working conditions such as heavy load and dust.

[0066] In one embodiment, see Figure 1 , Figure 3 and Figure 6 As shown, it also includes a lubrication pump 600, which includes a rotor assembly; one of the input shaft 210, the first drive shaft 310 and the second drive shaft 320 is connected to the rotor assembly to drive the rotor assembly to rotate, so that the lubrication pump 600 pumps lubricating oil to the input assembly 200.

[0067] It should be noted that the transmission requires a lubrication pump 600 to provide lubricating oil to the bearings and gears to ensure transmission stability and reduce wear on the internal structure of the transmission. In related technologies, the lubrication pump 600 is an electronic oil pump, directly installed outside the housing 100. However, if the electronic oil pump experiences a power outage or other malfunction, it will stop operating, while the bearings and gears inside the transmission continue to rotate. This may lead to severe wear or poor heat dissipation of the internal bearings and gears due to untimely lubrication supply, affecting the service life of the transmission.

[0068] Therefore, the lubrication pump 600 in this embodiment is a mechanical pump. The rotor assembly of the lubrication pump 600 is connected to the input shaft 210, the first drive shaft 310, or the second drive shaft 320. In this way, the power source of the lubrication pump 600 is the same as the power source of the gearbox. The lubrication pump 600 starts and stops synchronously with the input assembly 200, thereby ensuring that the lubrication pump 600 can always pump a sufficient amount of lubricating oil during the operation of the gearbox. This is beneficial to ensuring the stability of the gearbox during operation and extending the service life of the gearbox.

[0069] The rotor assembly can be connected to any one of the input shaft 210, the first transmission shaft 310, and the second transmission shaft 320 according to different requirements for the speed of the drive source. This application embodiment does not limit this.

[0070] In one embodiment, see Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the housing 100 is provided with a lubricating oil passage 111, and the input assembly 200 also includes a fourth bearing 230; the lubricating oil passage 111 is arranged parallel to the input shaft 210, and the lubricating oil passage 111 is connected to the oil outlet of the lubricating pump 600 so that the lubricating pump 600 pumps lubricating oil to the lubricating oil passage 111; both ends of the input shaft 210 are rotatably connected to the housing 100 through the fourth bearing 230; the lubricating oil passage 111 has a first throttling hole 1111 and a second throttling hole 1112 so that the lubricating oil in the lubricating oil passage 111 flows to the fourth bearing 230 through the first throttling hole 1111, and flows to the drive gear 220 through the second throttling hole 1112.

[0071] In a specific implementation, there are two fourth bearings 230, located at both ends of the input shaft 210. Correspondingly, there are also two first throttling orifices 1111, corresponding to the positions of the fourth bearings 230. An oil suction pipe 121 can also be provided on the housing 100. One end of the oil suction pipe 121 is connected to the lubricating oil passage 111, and the other end is connected to the oil outlet of the lubricating pump 600. The lubricating pump 600 pumps lubricating oil to the lubricating oil passage 111 through the oil suction pipe 121. The lubricating oil in the lubricating oil passage 111 flows out from the first throttling orifice 1111 and the second throttling orifice 1112 and flows to the fourth bearing 230 and the drive gear 220, thereby completing the lubrication of the output component 400. Furthermore, after the lubricating oil falls onto the surfaces of the input shaft 210 and the drive gear 220, the high rotation of the drive gear 220 and the disturbance caused by the shaft system operation create an oil droplet splashing and oil mist dispersion effect. The splashed lubricating oil falls into the shafts and gears of the transmission assembly 300 and the output assembly 400, thereby achieving indirect lubrication of the transmission assembly 300 and the output assembly 400. Therefore, the lubrication method combining forced lubrication and splash lubrication in this embodiment of the application is beneficial in ensuring sufficient lubrication and cooling of all components within the transmission while simplifying the oil circuit structure within the transmission and reducing the manufacturing and maintenance costs of the transmission.

[0072] Furthermore, a temperature sensor can be installed at the oil suction pipe 121 or the lubrication oil passage 111 to detect the temperature of the lubricating oil, thereby enabling real-time assessment of the gearbox's operating status: excessively high temperature indicates poor lubrication or insufficient cooling, while excessively low oil temperature indicates insufficient preheating or excessively low ambient temperature. Therefore, early warning can be achieved by detecting the temperature of the lubricating oil, allowing staff to take timely measures such as changing the oil or starting / stopping the cooling system to prevent gearbox failure and further improve the reliability of the gearbox.

[0073] In addition, an oil filter element 610 can be installed between the oil outlet of the lubrication pump 600 and the oil suction pipe 121. The oil filter element 610 can effectively trap metal shavings, dust particles and other contaminants in the lubricating oil, preventing hard impurities from entering the lubrication oil passage 111 and causing blockage of the first throttling orifice 1111 or the second throttling orifice 1112, or entering the inside of the gearbox 100. This helps reduce the risk of wear and scratches on the internal structures of the input component 200, transmission component 300 and output component 400, and extends the service life of the gearbox. At the same time, keeping the lubricating oil clean can also slow down the rate of oil deterioration, extend the oil change interval and reduce the maintenance cost of the gearbox.

[0074] In one embodiment, see Figure 1 , Figure 3 and Figure 6As shown, the transmission assembly 300 also includes a fifth bearing 370 and a sixth bearing 380. The two ends of the first transmission shaft 310 are rotatably connected to the housing 100 through the fifth bearing 370; the two ends of the second transmission shaft 320 are rotatably connected to the housing 100 through the sixth bearing 380; the housing 100 has a first oil collection groove 112 and a second oil collection groove 113. The first oil collection groove 112 is located on the periphery of the fifth bearing 370, and the second oil collection groove 113 is located on the periphery of the sixth bearing 380.

[0075] Understandably, the first oil collection tank 112 and the second oil collection tank 113 can collect and converge the splashed lubricating oil in a directional manner, forming a local oil pool effect. This ensures that the outer rings of the fifth bearing 370 and the sixth bearing 380 are always flushed with oil, which helps to ensure the reliability of the lubricating oil supply to the fifth bearing 370 and the sixth bearing 380 and improves the heat dissipation efficiency of the fifth bearing 370 and the sixth bearing 380.

[0076] In addition, the first oil collection groove 112 and the second oil collection groove 113 are directly formed on the inner wall of the housing 100, eliminating the need for additional oil collection trays or oil guide pipes. This simplifies the internal spatial layout of the housing 100 and improves the overall structural compactness of the gearbox.

[0077] Furthermore, spacers 800 can be provided between the third bearing 450 and the first driven gear 420 or the second driven gear 430, between the fifth bearing 370 and the first transmission gear 330 or the second transmission gear 340, and between the sixth bearing 380 and the third transmission gear 350 or the fourth transmission gear 360. On the one hand, the axial force of the gear can be transmitted to the inner ring of the bearing to avoid stress concentration. On the other hand, it can play the role of rigid fixed-distance support to avoid the gear and bearing directly contacting each other, which would lead to over-positioning or insufficient clearance. The embodiments of this application do not limit this, and can be reasonably set according to the positioning method of each gear, safety requirements, etc.

[0078] According to an embodiment of the present invention, another aspect provides a working machine including any of the aforementioned gearboxes.

[0079] The specific structure and working principle of the gearbox have been described in detail in the above embodiments, and will not be repeated here.

[0080] In this application embodiment, the operating machinery can be excavators, loaders, cranes, and other machinery used in various fields, including but not limited to earthwork engineering, agriculture, lifting and transportation, road construction, mining and forestry. Any machinery that is driven by a new energy power source such as an electric motor and needs to be controlled by a gearbox is acceptable. This application embodiment does not limit this.

[0081] Specifically, by equipping the aforementioned gearbox, the operator can flexibly control the actions of the machinery's actuators, which also helps reduce the overall manufacturing and maintenance costs of the machinery.

[0082] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A gearbox for a work machine, characterized in that include: Box (100); The input component (200) includes an input shaft (210) and a drive gear (220). The input shaft (210) is rotatably mounted on the housing (100) and is used to connect to the drive device (10) of the working machine. The drive gear (220) is connected to the input shaft (210). A transmission assembly (300) is engaged with the drive gear (220) in a transmission relationship; An output assembly (400) includes an output shaft (410), a first driven gear (420), a second driven gear (430), and a sliding member (440). The output shaft (410) is rotatably mounted on the housing (100). The first driven gear (420) and the second driven gear (430) are both in transmission engagement with the transmission assembly (300). The first driven gear (420) and the second driven gear (430) are both rotatably connected to the output shaft (410). The sliding member (440) is located between the first driven gear (420) and the second driven gear (430). The sliding member (440) is at least partially connected to the output shaft (410) and is in sliding engagement with the output shaft (410). A drive assembly (500) is configured to drive the slider (440) to slide relative to the output shaft (410) such that the slider (440) is partially connected to the first driven gear (420) or the second driven gear (430) such that the first driven gear (420) or the second driven gear (430) drives the output shaft (410) to rotate.

2. The gearbox according to claim 1, characterized in that, The transmission assembly (300) includes a first transmission shaft (310), a second transmission shaft (320), a first transmission gear (330), a second transmission gear (340), a third transmission gear (350), and a fourth transmission gear (360). The first drive shaft (310) and the second drive shaft (320) are both rotatably disposed within the housing (100), the first drive gear (330) and the second drive gear (340) are both connected to the first drive shaft (310), and the third drive gear (350) and the fourth drive gear (360) are both connected to the second drive shaft (320). The first transmission gear (330) meshes with the driving gear (220), the second transmission gear (340) meshes with the third transmission gear (350), the third transmission gear (350) meshes with the first driven gear (420), and the fourth transmission gear (360) meshes with the second driven gear (430).

3. The gearbox according to claim 1, characterized in that, The output component (400) also includes a first bearing (421) and a second bearing (431). The first bearing (421) and the second bearing (431) are sleeved on the output shaft (410). The first driven gear (420) is rotatably connected to the output shaft (410) through the first bearing (421), and the second driven gear (430) is rotatably connected to the output shaft (410) through the second bearing (431).

4. The gearbox according to claim 1, characterized in that, The sliding member (440) is provided with internal teeth, and the output shaft (410) is provided with external teeth; The internal teeth at least partially mesh with the external teeth, and the length of the external teeth along the axial direction of the output shaft (410) is greater than or equal to the length of the internal teeth along the axial direction of the output shaft (410). The first driven gear (420) is provided with a first connecting portion (422) extending toward the slider (440), and the first connecting portion (422) is provided with a first tooth (4221). The second driven gear (430) is provided with a second connecting portion (432) extending toward the slider (440), and the second connecting portion (432) is provided with a second tooth (4321). The internal tooth portion meshes with the first tooth (4221) or the second tooth (4321) so that the first driven gear (420) or the second driven gear (430) drives the output shaft (410) to rotate through the slider (440).

5. The gearbox according to claim 1, characterized in that, The drive assembly (500) includes a drive shaft (510), a drive member (520), a bushing (530), and a shift fork (540). The sliding member (440) has a connecting groove (441) in the circumferential direction. The drive shaft (510) is located inside the housing (100), the bushing (530) is fitted onto the drive shaft (510) and the bushing (530) is slidably engaged with the drive shaft (510), one end of the shift fork (540) is connected to the bushing (530), and the other end of the shift fork (540) is located in the connecting groove (441); The drive member (520) is connected to the housing (100) and is configured to drive the bushing (530) to slide relative to the drive shaft (510) so that the shift fork (540) drives the slider (440) to slide relative to the output shaft (410).

6. The gearbox according to claim 5, characterized in that, The drive shaft (510) is provided with two limiting structures (511). The two limiting structures (511) are spaced apart along the axial direction of the drive shaft (510), and the bushing (530) is located between the two limiting structures (511) and is limited and engaged with the limiting structures (511).

7. The gearbox according to any one of claims 1-6, characterized in that, The output assembly (400) also includes a third bearing (450), a sealing sleeve (460), an output flange (470), a retaining ring (480), and an oil seal (490). The third bearing (450), the sealing sleeve (460), and the output flange (470) are sequentially sleeved on the output shaft (410). The output shaft (410) is rotatably connected to the housing (100) through the third bearing (450). The output flange (470) is used to connect to the actuator of the working machinery. The sealing sleeve (460) is sealed to both the third bearing (450) and the output flange (470). The retaining ring (480) is fixedly connected to the housing (100). The retaining ring (480) is located on the side of the third bearing (450) facing the sealing sleeve (460) and forms a limiting fit with the third bearing (450). The oil seal (490) is fitted outside the sealing sleeve (460), and the oil seal (490) is sealed to both the sealing sleeve (460) and the housing (100).

8. The gearbox according to claim 2, characterized in that, It also includes a lubrication pump (600), which includes a rotor assembly; The housing (100) is provided with a lubrication channel (111), and the input assembly (200) further includes a fourth bearing (230). The two ends of the input shaft (210) are rotatably connected to the housing (100) through the fourth bearing (230). The lubricating oil passage (111) is arranged parallel to the input shaft (210), and the lubricating oil passage (111) is connected to the oil outlet of the lubrication pump (600). One of the input shaft (210), the first drive shaft (310) and the second drive shaft (320) is connected to the rotor assembly to drive the rotor assembly to rotate, so that the lubrication pump (600) pumps the lubricating oil to the lubricating oil passage (111). The lubricating oil passage (111) has a first throttling hole (1111) and a second throttling hole (1112) so that the lubricating oil in the lubricating oil passage (111) flows to the fourth bearing (230) through the first throttling hole (1111) and flows to the drive gear (220) through the second throttling hole (1112).

9. The gearbox according to claim 8, characterized in that, The transmission assembly (300) also includes a fifth bearing (370) and a sixth bearing (380). The two ends of the first drive shaft (310) are rotatably connected to the housing (100) through the fifth bearing (370); The two ends of the second drive shaft (320) are rotatably connected to the housing (100) via the sixth bearing (380); The housing (100) has a first oil collection groove (112) and a second oil collection groove (113). The first oil collection groove (112) is located on the periphery of the fifth bearing (370), and the second oil collection groove (113) is located on the periphery of the sixth bearing (380).

10. A type of operating machinery, characterized in that, Includes the gearbox as described in any one of claims 1-9.

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