Gearbox and tractor

Abstract

The application provides a gearbox and tractor, the gearbox comprising: a housing assembly provided with a receiving cavity; an input module comprising an input shaft rotationally connected with the housing assembly, the input shaft being at least partially arranged in the receiving cavity; a clutch module arranged in the receiving cavity, the clutch module comprising a PTO shaft clutch and a forward gear clutch; and an output module comprising an output shaft and a PTO shaft, the output shaft being rotationally connected with the housing assembly, the output shaft being disengageably engaged with the input shaft through the forward gear clutch, so that the input shaft transmits torque to the output shaft in a first state; the PTO shaft being disengageably engaged with the input shaft through the PTO shaft clutch, so that the input shaft transmits torque to the PTO shaft in a second state. Through integrated design of the PTO shaft, the clutch module and the housing assembly, the arrangement space is reduced, and the structural complexity and manufacturing cost are reduced. Meanwhile, the power transmission path is shortened, and the transmission efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of agricultural machinery technology, specifically relating to a gearbox and a tractor. Background Technology

[0002] In the field of agricultural machinery, the performance of the power take-off (PTO) system is crucial for tractors, which are key pieces of equipment. The PTO shaft, as a critical component for transmitting power from the tractor to external equipment, plays an indispensable role in practical applications.

[0003] Traditional tractor PTO shafts typically employ an independent design. In an independent PTO shaft, the PTO shaft clutch is separate from the gearbox, requiring an additional housing, lubrication, and cooling system for the PTO shaft clutch. Because the independent housing, lubrication, and cooling system encroach on the limited space around the gearbox, the gearbox becomes structurally complex, space-consuming, and expensive. Utility Model Content

[0004] The purpose of this application is to at least solve the problems of existing tractor power shift gearboxes, such as complex structure, large space occupation, and high cost. This purpose is achieved through the following technical solution:

[0005] The first aspect of this application proposes a gearbox, comprising:

[0006] The housing assembly is provided with a receiving cavity;

[0007] The input module includes an input shaft rotatably connected to the housing assembly, the input shaft being at least partially disposed in the receiving cavity;

[0008] A clutch module is disposed in the accommodating cavity, and the clutch module includes a PTO shaft clutch and a forward gear clutch;

[0009] An output module includes an output shaft and a PTO shaft. The output shaft is rotatably connected to the housing assembly. The output shaft is separably engaged with the input shaft via the forward gear clutch, so that the input shaft transmits torque to the output shaft in a first state. The PTO shaft is separably engaged with the input shaft via the PTO shaft clutch, so that the input shaft transmits torque to the PTO shaft in a second state.

[0010] According to the gearbox of this application, the output shaft is separably engaged with the input shaft via a forward gear clutch. When the engine is started and the driver engages forward gear, the input shaft has a first state of engagement with the output shaft, in which the input shaft transmits torque to the output shaft, thereby enabling the tractor to move forward. The PTO shaft is separably engaged with the input shaft via a PTO shaft clutch. When the engine is started and the driver engages PTO gear, the input shaft has a second state of engagement with the PTO shaft, in which the input shaft transmits torque to the PTO shaft, and the PTO shaft transmits power to external equipment, thereby enabling the tractor to take off power. Since the clutch module is located in the housing cavity of the housing assembly, there is no need to provide a separate housing for the clutch module, thus saving the space required for the clutch module to be arranged outside the gearbox, reducing structural complexity and manufacturing costs. At the same time, the power transmission path between the input shaft and the output shaft, and between the input shaft and the PTO shaft, is shortened, thereby improving transmission efficiency.

[0011] In addition, the gearbox according to this application may also have the following additional technical features:

[0012] In some embodiments of this application, the housing assembly includes a first housing and a second housing connected to each other, the first housing and the second housing surrounding the receiving cavity; the PTO shaft clutch and the forward gear clutch are arranged side by side, the PTO shaft clutch is located at one end of the receiving cavity near the first housing, and the forward gear clutch is located at one end of the receiving cavity near the second housing.

[0013] In some embodiments of this application, the PTO shaft clutch includes a first outer hub, a first inner hub, and a first clutch plate assembly. The first outer hub is sleeved on the outer periphery of the first inner hub. The first outer hub is fixedly connected to the input shaft, and the first inner hub is fixedly connected to one end of the PTO shaft near the input shaft.

[0014] Along the axial direction of the input shaft, the first clutch plate assembly is configured to move between a first disengaged position and a first engaged position. In the first disengaged position, the first clutch plate assembly is arranged to position the first inner hub in a state of separation from the first outer hub. In the first engaged position, the first clutch plate assembly is arranged to position the first inner hub in a state of frictional engagement with the first outer hub.

[0015] In some embodiments of this application, the forward gear clutch includes a second outer hub, a second inner hub, and a second clutch plate assembly. The second outer hub is sleeved on the outer peripheral side of the second inner hub, the second inner hub is fixedly connected to the first outer hub, and the second outer hub is fixedly connected to one end of the output shaft near the input shaft.

[0016] Along the axial direction of the input shaft, the second clutch plate assembly is configured to move between a second disengaged position and a second engaged position. In the second disengaged position, the second clutch plate assembly is arranged to position the second outer hub in a state of separation from the second inner hub. In the second engaged position, the second clutch plate assembly is arranged to position the second outer hub in a state of frictional engagement with the second inner hub.

[0017] In some embodiments of this application, the output shaft is provided with a hollow channel, the output shaft is sleeved on the periphery of the PTO shaft, the first end of the PTO shaft passes through the channel and extends in a direction close to the input shaft, and the second end of the PTO shaft is used to connect to an external device.

[0018] In some embodiments of this application, the input module further includes a first bearing and a second bearing, the input shaft being rotatably connected to the first housing via the first bearing; the portion of the input shaft located in the accommodating cavity is provided with a first groove for accommodating the second bearing, and the PTO shaft is rotatably connected to the input shaft via the second bearing.

[0019] In some embodiments of this application, the output module further includes a third bearing and a fourth bearing, the output shaft is rotatably connected to the second housing via the third bearing, the output shaft is provided with a second groove for accommodating the fourth bearing, and the PTO shaft is rotatably connected to the output shaft via the fourth bearing.

[0020] In some embodiments of this application, the gearbox further includes a lubrication circuit module, which communicates with the accommodating cavity to lubricate the PTO shaft clutch and the forward gear clutch.

[0021] In some embodiments of this application, the lubrication circuit module includes an oil guide groove disposed on the housing assembly, a first radial oil hole disposed on the output shaft, and an axial oil hole disposed on the PTO shaft. The first radial oil hole is arranged along the radial direction of the output shaft and communicates with the oil guide groove; the axial oil hole is arranged along the axial direction of the PTO shaft, with a first end communicating with the first radial oil hole and a second end communicating with the accommodating cavity.

[0022] In some embodiments of this application, the lubrication circuit module further includes a second radial oil hole and a third radial oil hole disposed on the PTO shaft. The second radial oil hole and the third radial oil hole are arranged at intervals in the axial direction of the PTO shaft. The first end of the second radial oil hole communicates with the first radial oil hole, and the second end of the second radial oil hole communicates with the axial oil hole. The first end of the third radial oil hole communicates with the axial oil hole, and the second end of the third radial oil hole communicates with the accommodating cavity.

[0023] A second aspect of this application proposes a tractor including the gearbox as described above. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structural arrangement of the gearbox in the embodiments of this application;

[0026] Figure 2 for Figure 1 Cross-sectional view of the transmission;

[0027] Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle;

[0028] Figure 4 for Figure 2 A schematic diagram of the lubrication circuit structure of the intermediate gearbox;

[0029] Figure 5 for Figure 4 A schematic diagram of the working principle of the lubrication circuit structure, where the arrows indicate the flow direction of the lubricating oil.

[0030] The attached figures are labeled as follows:

[0031] 10. Housing assembly; 11. First housing; 12. Second housing; 101. Receiving cavity;

[0032] 20. Input module; 21. Input shaft; 211. First groove; 22. First bearing; 23. Second bearing;

[0033] 30. Clutch module; 31. PTO shaft clutch; 311. First outer hub; 312. First inner hub; 313. First clutch plate assembly; 32. Forward gear clutch; 321. Second outer hub; 322. Second inner hub; 323. Second clutch plate assembly;

[0034] 40. Output module; 41. Output shaft; 411. Channel; 412. Second groove; 42. PTO shaft; 43. Third bearing; 44. Fourth bearing;

[0035] 50. Lubrication circuit module; 51. Oil guide groove; 52. First radial oil hole; 53. Axial oil hole; 54. Second radial oil hole; 55. Third radial oil hole. Detailed Implementation

[0036] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0037] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0038] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0039] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0040] like Figure 1 and Figure 2 As shown, according to an embodiment of this application, a gearbox is proposed, including a housing assembly 10, an input module 20, a clutch module 30, and an output module 40. The housing assembly 10 is provided with a receiving cavity 101. The input module 20 includes an input shaft 21 rotatably connected to the housing assembly 10, and the input shaft 21 is at least partially disposed in the receiving cavity 101. The clutch module 30 is disposed in the receiving cavity 101 and includes a PTO shaft clutch 31 and a forward gear clutch 32. The output module 40 includes an output shaft 41 and a PTO shaft 42. The output shaft 41 is rotatably connected to the housing assembly 10. The output shaft 41 is separably engaged with the input shaft 21 through the forward gear clutch 32, so that the input shaft 21 transmits torque to the output shaft 41 in a first state. The PTO shaft 42 is separably engaged with the input shaft 21 through the PTO shaft clutch 31, so that the input shaft 21 transmits torque to the PTO shaft 42 in a second state.

[0041] In this embodiment, the input shaft 21 is connected to the power output end of the engine, allowing the engine's power to be transmitted to the input module 20. This power is then distributed to the output shaft 41 and the PTO shaft 42 via the clutch module 30, enabling the engagement and disengagement of the power take-off function without affecting the tractor's forward movement. Specifically, the output shaft 41 is detachably engaged with the input shaft 21 via the forward gear clutch 32. When the engine is started and the driver engages forward gear, the input shaft 21 is in a first state of engagement with the output shaft 41, transmitting torque to the output shaft 41 to achieve forward movement of the tractor. The PTO shaft 42 is detachably engaged with the input shaft 21 via the PTO shaft clutch 31. When the engine is started and the driver engages PTO gear, the input shaft 21 is in a second state of engagement with the PTO shaft 42, transmitting torque to the PTO shaft 42. The PTO shaft 42 then transmits power to external devices, enabling the tractor to perform power take-off operations. Since the clutch module 30 is housed in the receiving cavity 101 of the housing assembly 10, there is no need to provide a separate outer shell for the clutch module 30. This saves the space required for the clutch module 30 to be placed outside the gearbox, reducing structural complexity and manufacturing costs. At the same time, it shortens the power transmission path between the input shaft 21 and the output shaft 41, and between the input shaft 21 and the PTO shaft 42, thereby improving transmission efficiency.

[0042] It should be noted that the input shaft 21 can be engaged with both the output shaft 41 and the PTO shaft 42 simultaneously. The engagement and disengagement of the PTO shaft 42 with the input shaft 21 does not affect the engagement and disengagement of the input shaft 21 with the output shaft 41, that is, it does not affect the forward operation of the tractor.

[0043] In some embodiments, the housing assembly 10 includes a first housing 11 and a second housing 12 connected to each other, forming a receiving cavity 101. A PTO shaft clutch 31 and a forward gear clutch 32 are arranged side by side, with the PTO shaft clutch 31 located at one end of the receiving cavity 101 near the first housing 11 and the forward gear clutch 32 located at one end of the receiving cavity 101 near the second housing 12. Specifically, the first housing 11 may be located near the engine, at the front end of the transmission, while the second housing 12 may be located away from the engine, at the rear end of the transmission. The first housing 11 has a first through hole communicating with the receiving cavity 101. In the axial direction of the input shaft 21, a first end of the input shaft 21 is drive-connected to the power output end of the engine, and a second end of the input shaft 21 extends into the receiving cavity 101 through the first through hole. The second housing 12 is provided with a second through hole communicating with the receiving cavity 101. In the axial direction of the output shaft 41, the first end of the output shaft 41 extends into the receiving cavity 101 through the second through hole, and the second end of the output shaft 41 can be connected to the vehicle's wheel drive via a gear transmission mechanism. The PTO shaft clutch 31 and the forward gear clutch 32 are arranged side by side. The PTO shaft clutch 31 is located at the end of the receiving cavity 101 near the first housing 11, and the forward gear clutch 32 is located at the end of the receiving cavity 101 near the second housing 12. This arrangement can save space, so that the input shaft 21 can transmit power to the output shaft 41 through the PTO shaft clutch 31, and the input shaft 21 can transmit power to the PTO shaft 42 through the forward gear clutch 32, thereby shortening the power transmission path and improving transmission efficiency.

[0044] like Figure 2 and Figure 3 As shown, the PTO shaft clutch 31 includes a first outer hub 311, a first inner hub 312, and a first clutch plate assembly 313. The first outer hub 311 is sleeved on the outer periphery of the first inner hub 312. The first outer hub 311 is fixedly connected to the input shaft 21, and the first inner hub 312 is fixedly connected to one end of the PTO shaft 42 near the input shaft 21. Along the axial direction of the input shaft 21, the first clutch plate assembly 313 is configured to move between a first disengaged position and a first engaged position. In the first disengaged position, the first clutch plate assembly 313 is arranged to position the first inner hub 312 in a state of separation from the first outer hub 311. In the first engaged position, the first clutch plate assembly 313 is arranged to position the first inner hub 312 in a state of frictional locking with the first outer hub 311.

[0045] In this embodiment, the first outer hub 311 is arranged circumferentially along the PTO shaft 42 to form a hollow cylindrical structure. The first outer hub 311 can be fixedly connected to the input shaft 21 via a spline. The first inner hub 312 is arranged circumferentially along the PTO shaft 42 to form a hollow cylindrical structure. The inner side of the first inner hub 312 can be fixedly connected to the end of the PTO shaft 42 near the input shaft 21 via a spline. A part of the first clutch plate assembly 313 can be engaged with the first outer hub 311, and another part of the first clutch plate assembly 313 can be engaged with the first inner hub 312. When the PTO gear is not engaged, a part of the first clutch plate assembly 313 can rotate together with the first outer hub 311, but does not affect the first inner hub 312. That is, the first inner hub 312 is in a state of separation from the first outer hub 311, and the torque of the first outer hub 311 will not be transmitted to the first inner hub 312. Specifically, the first clutch plate group 313 includes a plurality of first clutch plate units arranged at intervals. The first clutch plate unit is configured as an annular structure. In two adjacent first clutch plate units, one of the first clutch plate units is configured as a steel plate and the other is configured as a friction plate. The outer side of the steel plate is provided with convex teeth. The first outer hub 311 is provided with a tooth groove that meshes with the convex teeth. Similarly, the inner side of the friction plate and the first inner hub 312 are also meshed through the convex tooth groove structure. With this configuration, when the PTO gear is engaged, axial pressure is applied to multiple first clutch plate units, allowing them to move axially along the input shaft 21. The friction between adjacent first clutch plate units gradually increases, causing the steel plates and friction plates to move simultaneously as a single unit. When the first clutch plate group 313 reaches the first engagement position, the first inner hub 312 and the first outer hub 311 are locked together by the friction between the first clutch plate units. The first inner hub 312 and the first outer hub 311 rotate synchronously. Since the first outer hub 311 is fixedly connected to the input shaft 21 and the first inner hub 312 is fixedly connected to the end of the PTO shaft 42 near the input shaft 21, the input shaft 21 is in the first state, and the input shaft 21 and the output shaft 41 are engaged. The power of the input shaft 21 is transmitted to the output shaft 41 through the first clutch plate group 313, enabling the tractor to move forward.

[0046] like Figure 2 and Figure 3As shown, the forward gear clutch 32 includes a second outer hub 321, a second inner hub 322, and a second clutch plate assembly 323. The second outer hub 321 is sleeved on the outer periphery of the second inner hub 322. The second inner hub 322 is fixedly connected to the first outer hub 311. The second outer hub 321 is fixedly connected to one end of the output shaft 41 near the input shaft 21. Along the axial direction of the input shaft 21, the second clutch plate assembly 323 is configured to move between a second disengaged position and a second engaged position. In the second disengaged position, the second clutch plate assembly 323 is arranged to position the second inner hub 322 in a state of separation from the second outer hub 321. In the second engaged position, the second clutch plate assembly 323 is arranged to position the second inner hub 322 in a state of frictional locking with the second outer hub 321.

[0047] In this embodiment, the second outer hub 321 is arranged circumferentially along the PTO shaft 42 to form a hollow cylindrical structure. The second outer hub 321 can be fixedly connected to the end of the output shaft 41 near the input shaft 21 via a spline. The second inner hub 322 is arranged circumferentially along the PTO shaft 42 to form a hollow cylindrical structure. The inner side of the second inner hub 322 can be fixedly connected to the first outer hub 311 via a spline, so that the second inner hub 322 rotates together with the first outer hub 311. This can save layout space and improve the degree of integration. A portion of the second clutch plate assembly 323 can engage with the second outer hub 321, and another portion can engage with the second inner hub 322. When no forward gear is engaged, a portion of the second clutch plate assembly 323 can rotate together with the second inner hub 322 without affecting the second outer hub 321. In other words, the second inner hub 322 is separated from the second outer hub 321, and the torque of the second inner hub 322 is not transmitted to the second outer hub 321. Specifically, the second clutch plate assembly 323 includes multiple spaced-apart second clutch plate units. Each second clutch plate unit is an annular structure. In two adjacent second clutch plate units, one is a steel plate, and the other is a friction plate. The steel plate of the second clutch plate unit is engaged with the second outer hub 321 through a toothed groove structure, and the friction plate of the second clutch plate unit is also engaged with the second inner hub 322 through a toothed groove structure. With this configuration, when the forward gear is engaged, axial pressure is applied to multiple second clutch plate units, allowing them to move axially along the input shaft 21. The friction between adjacent second clutch plate units gradually increases, causing the steel plates and friction plates to move simultaneously as a unit. When the second clutch plate group 323 reaches the second engagement position, the second inner hub 322 and the second outer hub 321 are locked together by the friction between the second clutch plate units. The second inner hub 322 and the second outer hub 321 rotate synchronously. Since the second inner hub 322 is fixedly connected to the first outer hub 311 and the first inner hub 312 is fixedly connected to the end of the PTO shaft 42 near the input shaft 21, the input shaft 21 is in the second state, and the input shaft 21 and the PTO shaft 42 are engaged. The power of the input shaft 21 is transmitted to the output shaft 41 through the second clutch plate group 323, realizing the power take-off operation of the tractor. When the second clutch plate group 323 reaches the second disengagement position, the second inner hub 322 and the second outer hub 321 are in a disengaged state, and the PTO shaft 42 and the input shaft 21 are in a disconnected state. That is, the engagement and disengagement of the PTO shaft 42 and the input shaft 21 do not affect the forward operation of the tractor.

[0048] In some embodiments, the output shaft 41 is provided with a hollow channel 411, and the output shaft 41 is sleeved around the periphery of the PTO shaft 42. In the axial direction of the input shaft 21, the first end of the PTO shaft 42 passes through the channel 411 and extends in a direction close to the input shaft 21. The second end of the PTO shaft 42 is located outside the housing assembly 10 and is used to connect to an external device. By setting the output shaft 41 as a hollow shaft, and the first end of the PTO shaft 42 passing through the channel 411 and extending into the receiving cavity 101, this configuration facilitates the connection of the first inner hub 312 of the PTO shaft clutch 31 to the PTO shaft 42, thereby transmitting a portion of the power from the input shaft 21 to the PTO shaft 42. The second end of the PTO shaft 42 is connected to an external device to achieve power take-off operation.

[0049] In some embodiments, such as Figure 2 and Figure 3 As shown, the input module 20 also includes a first bearing 22 and a second bearing 23. The input shaft 21 is rotatably connected to the first housing 11 via the first bearing 22. A first groove 211 for accommodating the second bearing 23 is provided at the second end of the input shaft 21. The PTO shaft 42 is rotatably connected to the input shaft 21 via the second bearing 23. The first bearing 22 provides support for the input shaft 21, reducing wear on the input shaft 21.

[0050] Optionally, the housing assembly 10 further includes a first baffle, which is bolted to the inner wall of the first housing 11 to limit the axial displacement of the first bearing 22.

[0051] In some embodiments, such as Figure 2 and Figure 3 As shown, the output module 40 also includes a third bearing 43 and a fourth bearing 44. The output shaft 41 is rotatably connected to the second housing 12 via the third bearing 43. The third bearing 43 supports the output shaft 41, reducing wear. A second groove 412 is provided at the first end of the output shaft 41 to accommodate the fourth bearing 44. The PTO shaft 42 is rotatably connected to the output shaft 41 via the fourth bearing 44. By providing the second bearing 43 and the fourth bearing 44, the PTO shaft 42 can be supported.

[0052] Optionally, the second groove 412 communicates with the channel 411. The housing assembly 10 also includes a second baffle, which is bolted to the inner wall of the second housing 12 to limit the axial displacement of the third bearing 43.

[0053] Existing independent power take-off (PTO) designs result in lubrication lines being separate from the gearbox housing, increasing maintenance difficulty. Under high-load conditions, the independent PTO's heat dissipation efficiency is insufficient, easily leading to clutch overheating and failure. The gearbox provided in this application integrates the lubrication circuit module 50 and the clutch module 30 into the receiving cavity 101 of the housing assembly 10, saving manufacturing costs and reducing overall weight. The specific structural design is described below.

[0054] In this embodiment, as Figure 2 and Figure 4 As shown, the transmission also includes a lubrication circuit module 50, which communicates with the housing cavity 101 to lubricate the PTO shaft clutch 31 and the forward gear clutch 32. Since the lubrication circuit module 50 and the clutch module 30 are integrated into the housing assembly 101, the lubrication circuit module 50 lubricates and cools the PTO shaft clutch 31 and the forward gear clutch 32, reducing or preventing overheating failure of the clutch module 30.

[0055] like Figure 4 As shown, the lubrication circuit module 50 includes an oil guide groove 51 disposed on the housing assembly 10, a first radial oil hole 52 disposed on the output shaft 41, and an axial oil hole 53 disposed on the PTO shaft 42. The first radial oil hole 52 is arranged along the radial direction of the output shaft 41 and communicates with the oil guide groove 51; the axial oil hole 53 is arranged along the axial direction of the PTO shaft 42, with its first end communicating with the first radial oil hole 52 and its second end communicating with the receiving cavity 101. Figure 5 As shown, during operation, lubricating oil flows from the oil guide groove 51 through the first radial oil hole 52. A portion of the oil passes through the gap between the output shaft 41 and the PTO shaft 42, and under centrifugal force, is thrown towards the forward gear clutch 32, thus lubricating and cooling the forward gear clutch 32. The other portion of the oil enters the axial oil hole 53, passes through the gap between the first end of the PTO shaft 42 and the second end of the input shaft 21, and under centrifugal force, is thrown towards the PTO shaft clutch 31, thus lubricating and cooling the PTO shaft clutch 31. After passing through the gap between the first end of the PTO shaft 42 and the second end of the input shaft 21, the oil also lubricates and cools the second bearing 23.

[0056] Optionally, multiple first radial oil holes 52 may be provided, and the multiple first radial oil holes 52 are arranged at circumferential intervals along the output shaft 41.

[0057] like Figure 4As shown, the lubrication circuit module 50 also includes a second radial oil hole 54 and a third radial oil hole 55 disposed on the PTO shaft 42. The second radial oil hole 54 and the third radial oil hole 55 are arranged at intervals in the axial direction of the PTO shaft 42. The first end of the second radial oil hole 54 communicates with the first radial oil hole 52, and the second end of the second radial oil hole 54 communicates with the axial oil hole 53. The first end of the third radial oil hole 55 communicates with the axial oil hole 53, and the second end of the third radial oil hole 55 communicates with the receiving cavity 101. Figure 5 As shown, during operation, lubricating oil flows from the oil guide groove 51 through the first radial oil hole 52. Part of the oil passes through the gap between the output shaft 41 and the PTO shaft 42 and is thrown towards the forward gear clutch 32 under the action of centrifugal force, thereby lubricating and cooling the forward gear clutch 32. Another part of the oil enters the axial oil hole 53 from the second radial oil hole 54. The lubricating oil flowing out of the third radial oil hole 55 passes through the fourth bearing 44 and is thrown towards the forward gear clutch 32, thereby achieving lubrication and cooling of the forward gear clutch 32.

[0058] In this embodiment, the lubrication circuit module 50 can distribute oil as needed according to different operating conditions. For example, in forward operation, the input shaft 21 is engaged with the output shaft 41 through the forward gear clutch 32. The output shaft 41 rotates at high speed with the input shaft 21, and a portion of the oil passing through the gap between the output shaft 41 and the PTO shaft 42 is thrown towards the forward gear clutch 32 under centrifugal force, thus lubricating and cooling the forward gear clutch 32. In power take-off operation, the input shaft 21 is engaged with the PTO shaft 42 through the PTO shaft clutch 31. The PTO shaft 42 rotates at high speed with the input shaft 21, and a portion of the oil passing through the gap between the output shaft 41 and the PTO shaft 42 is thrown towards the forward gear clutch 32 and the PTO shaft clutch 31 under centrifugal force. Since the PTO shaft 42 also rotates at high speed with the input shaft 21, this portion of oil, together with another portion thrown out from the axial oil hole 53, lubricates and cools the PTO shaft clutch 31, improving the cooling effect.

[0059] This application also proposes a tractor including the gearbox as described above. Since the tractor includes the gearbox as described above, it naturally possesses the technical effects of the gearbox embodiments described above, which will not be elaborated upon here.

[0060] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A gearbox, characterized in that include: The housing assembly (10) is provided with a receiving cavity (101); The input module (20) includes an input shaft (21) rotatably connected to the housing assembly (10), the input shaft (21) being at least partially disposed in the receiving cavity (101); A clutch module (30) is disposed in the accommodating cavity (101), the clutch module (30) includes a PTO shaft clutch (31) and a forward gear clutch (32); The output module (40) includes an output shaft (41) and a PTO shaft (42). The output shaft (41) is rotatably connected to the housing assembly (10). The output shaft (41) is separably engaged with the input shaft (21) via the forward gear clutch (32) so that the input shaft (21) transmits torque to the output shaft (41) in a first state. The PTO shaft (42) is separably engaged with the input shaft (21) via the PTO shaft clutch (31) so that the input shaft (21) transmits torque to the PTO shaft (42) in a second state.

2. The gearbox according to claim 1, characterized in that The housing assembly (10) includes a first housing (11) and a second housing (12) connected to each other. The first housing (11) and the second housing (12) surround and form the receiving cavity (101). The PTO shaft clutch (31) and the forward gear clutch (32) are arranged side by side. The PTO shaft clutch (31) is located at one end of the receiving cavity (101) near the first housing (11), and the forward gear clutch (32) is located at one end of the receiving cavity (101) near the second housing (12).

3. The gearbox according to claim 1 or 2, characterized in that, The PTO shaft clutch (31) includes a first outer hub (311), a first inner hub (312), and a first clutch plate assembly (313). The first outer hub (311) is sleeved on the outer periphery of the first inner hub (312). The first outer hub (311) is fixedly connected to the input shaft (21), and the first inner hub (312) is fixedly connected to one end of the PTO shaft (42) near the input shaft (21). Along the axial direction of the input shaft (21), the first clutch plate assembly (313) is configured to move between a first disengaged position and a first engaged position. In the first disengaged position, the first clutch plate assembly (313) is arranged to position the first inner hub (312) in a state of separation from the first outer hub (311). In the first engaged position, the first clutch plate assembly (313) is arranged to position the first inner hub (312) in a state of frictional engagement with the first outer hub (311).

4. The gearbox of claim 3, wherein, The forward gear clutch (32) includes a second outer hub (321), a second inner hub (322), and a second clutch plate assembly (323). The second outer hub (321) is sleeved on the outer periphery of the second inner hub (322). The second inner hub (322) is fixedly connected to the first outer hub (311). The second outer hub (321) is fixedly connected to one end of the output shaft (41) near the input shaft (21). Along the axial direction of the input shaft (21), the second clutch plate assembly (323) is configured to move between a second disengaged position and a second engaged position. In the second disengaged position, the second clutch plate assembly (323) is arranged to position the second outer hub (321) in a state of separation from the second inner hub (322). In the second engaged position, the second clutch plate assembly (323) is arranged to position the second outer hub (321) in a state of frictional engagement with the second inner hub (322).

5. The gearbox according to claim 1 or 2, characterized in that, The output shaft (41) is provided with a hollow channel (411). The output shaft (41) is sleeved on the periphery of the PTO shaft (42). The PTO shaft (42) passes through the channel (411) and extends in a direction close to the input shaft (21). The PTO shaft (42) is used to connect to external devices.

6. The gearbox according to claim 2, characterized in that, The input module (20) further includes a first bearing (22) and a second bearing (23). The input shaft (21) is rotatably connected to the first housing (11) through the first bearing (22). The portion of the input shaft (21) located in the accommodating cavity (101) is provided with a first groove (211) for accommodating the second bearing (23). The PTO shaft (42) is rotatably connected to the input shaft (21) through the second bearing (23).

7. The gearbox of claim 2, wherein, The output module (40) further includes a third bearing (43) and a fourth bearing (44). The output shaft (41) is rotatably connected to the second housing (12) through the third bearing (43). The output shaft (41) is provided with a second groove (412) for accommodating the fourth bearing (44). The PTO shaft (42) is rotatably connected to the output shaft (41) through the fourth bearing (44).

8. The gearbox according to claim 1 or 2, characterized in that The gearbox also includes a lubrication circuit module (50) which is connected to the accommodating cavity (101) to lubricate the PTO shaft clutch (31) and the forward gear clutch (32).

9. The gearbox of claim 8, wherein, The lubrication circuit module (50) includes an oil guide groove (51) disposed on the housing assembly (10), a first radial oil hole (52) disposed on the output shaft (41), and an axial oil hole (53) disposed on the PTO shaft (42). The first radial oil hole (52) is arranged along the radial direction of the output shaft (41) and communicates with the oil guide groove (51). The axial oil hole (53) is arranged along the axial direction of the PTO shaft (42). The first end of the axial oil hole (53) communicates with the first radial oil hole (52), and the second end of the axial oil hole (53) communicates with the receiving cavity (101).

10. The gearbox of claim 9, wherein, The lubrication circuit module (50) further includes a second radial oil hole (54) and a third radial oil hole (55) disposed on the PTO shaft (42). The second radial oil hole (54) and the third radial oil hole (55) are arranged at intervals in the axial direction of the PTO shaft (42). The first end of the second radial oil hole (54) is connected to the first radial oil hole (52), and the second end of the second radial oil hole (54) is connected to the axial oil hole (53). The first end of the third radial oil hole (55) is connected to the axial oil hole (53), and the second end of the third radial oil hole (55) is connected to the receiving cavity (101).

11. A tractor characterised in that, Including the gearbox as described in any one of claims 1 to 10.

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