Multifunctional integrated gearbox

Abstract

The invention discloses a multifunctional integrated gearbox. The multifunctional integrated gearbox comprises a shell and an output shaft. The gear set is arranged in the shell, and the gear set comprises an input gear, at least one stage of intermediate transmission gear and an output gear; one end of the clutch assembly is connected with the output gear, and the other end of the clutch assembly is connected with an output shaft; and the brake assembly is connected with the output shaft, the brake assembly and the clutch assembly are arranged in a linkage mode, and the brake assembly is driven to operate through the clutch assembly.

Description

Technical Field

[0001] The present application relates to the technical field of gearboxes, and in particular to a multifunctional gearbox. Background Art

[0002] As a core power source for agricultural production, the reliability and compactness of an agricultural tractor's transmission system directly impacts operational efficiency and safety. Currently, power transmission and control in agricultural tractors rely primarily on the coordinated operation of multiple components. The meshing transmission of gears converts the high-speed, low-torque power input from the engine into low-speed, high-torque power to meet the demands of farming, transport, and other operations. The clutch assembly connects and disconnects the power transmission path, controlling the tractor's starting, stopping, and shifting gears, enabling transitions between travel modes. Braking is also provided during parking and slope operations, preventing the tractor from slipping and ensuring operational safety.

[0003] However, in related technologies, the components that achieve these functions are often independently designed and dispersed. The gearbox, serving as the power conversion core, is separately arranged, while the clutch and brake are separately installed via additional brackets. This separate structure results in a lengthy and complex tractor transmission system. This not only increases the overall weight and manufacturing cost of the equipment, but also requires the design of separate control circuits for each component, making the system control logic cumbersome and increasing the number of failure points. It also occupies the tractor's limited installation space, hindering the optimization of the overall machine layout. Especially in the high-frequency, high-intensity field operations of agricultural tractors, the connection reliability and maintenance convenience of decentralized components are further reduced, affecting the equipment's ability to continue operating.

[0004] Therefore, how to reduce the total weight of the equipment and production costs by sharing shell space and reusing components, and improve the layout flexibility and maintenance convenience of the internal components of agricultural tractors has become an urgent problem that needs to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a multifunctional integrated gearbox to improve the layout flexibility and maintenance convenience of the internal components of an agricultural tractor.

[0006] To achieve the above objectives, the technical solution adopted in this application is: to provide a multifunctional gearbox, including: a housing, an output shaft; a gear set, wherein the gear set is arranged in the housing, and the gear set includes an input gear, at least one intermediate transmission gear and an output gear; a clutch assembly, wherein one end of the clutch assembly is connected to the output gear, and the other end is used to connect to the output shaft; a brake assembly, wherein the brake assembly is connected to the output shaft, and the brake assembly is linked to the clutch assembly, and the brake assembly is driven to operate by the clutch assembly.

[0007] As a preferred embodiment, the clutch assembly includes a clutch plate and a driving member, the inner end of the clutch plate is sleeved on the outer wall of the output shaft and is used to connect with the output shaft, the outer end of the clutch plate is used to connect with the output gear, and the driving member is driven and connected to the clutch plate; when the driving member is pressurized, the clutch plate is forced to be tightly connected with the output shaft and the output gear, and the clutch assembly is in a power output state; when the driving member is depressurized, the drive to the clutch plate is released, and the connection between the clutch plate and the output shaft and the output gear is separated, and the clutch assembly is in a power cut-off state.

[0008] As another preferred embodiment, the clutch plates include multiple groups of first clutch plates and multiple groups of second clutch plates, and the multiple groups of first clutch plates and the multiple groups of second clutch plates are arranged in an alternating manner, and the first clutch plates and the second clutch plates are both provided with latching teeth on one end; the end latching teeth of the first clutch plates are connected to the output gear, and the end latching teeth of the second clutch plates are connected to the output shaft, and the end of the clutch plates is connected to the driving member, and the multiple groups of first clutch plates and the multiple groups of second clutch plates are driven by the driving member to tighten and fit together, so that the clutch assembly is in a power output state.

[0009] Further preferably, a friction plate is sandwiched between any adjacent first clutch plates and second clutch plates; wherein the friction plate has an upper friction limit to provide torque limitation for the clutch assembly.

[0010] Preferably, the driving member includes a fixed block, a hydraulic driving block and an abutment block, which are located on the outer wall of the output shaft and arranged in sequence along the axial direction. One end of the abutment block is used to connect with the clutch plate, and the fixed block is fixedly abutted against the end bearing of the output shaft. A hydraulic cavity is formed between the hydraulic driving block and the fixed block, and hydraulic oil is input into the hydraulic cavity through a hydraulic driving pump to drive the hydraulic driving block to push the abutment block, so that the abutment block presses against the first clutch plate and the second clutch plate.

[0011] Preferably, the multifunctional gearbox further comprises an elastic member, one end of which is embedded in the output shaft, and the elastic member extends along the axial direction of the output shaft to abut against the hydraulic drive block; wherein, when the hydraulic drive pump relieves the pressure in the hydraulic chamber, the elastic member pushes the hydraulic drive block to move away from the clutch plate, thereby canceling the fastening abutment of the abutment block on the clutch plate.

[0012] Preferably, the brake assembly includes a fixed disc and a brake disc, the fixed disc is fixed in the housing and is arranged near one end of the fixed block; the brake disc is arranged on the outer periphery of the hydraulic drive block toward the axial edge of the output shaft, and the brake disc is arranged to the side of the fixed disc; wherein, when the clutch assembly is in a power-cut-off state, the elastic member pushes the hydraulic drive block to drive the brake disc to be inserted into the fixed disc to achieve a braking effect on the output shaft.

[0013] Further preferably, the end portion of the brake disc facing the fixed disc is tapered.

[0014] Furthermore, a first gap is provided between the hydraulic drive block and the output shaft, and the first gap provides a transition section for the elastic member to extend from the output shaft to the hydraulic drive block.

[0015] Furthermore, the multifunctional gearbox also includes a clutch oil circuit one-way valve, which is arranged at the end of the output shaft close to the side of the fixed part, and the clutch oil circuit one-way valve is connected to the hydraulic chamber.

[0016] Compared with the prior art, the present invention has the following advantages: The gear set in the present application document is provided with a two-stage intermediate transmission gear to reduce the speed and increase the torque, and the output gear is connected to the intermediate transmission gear, thereby realizing an essential function of the multi-functional gearbox in the present application document. At the same time, a clutch assembly is provided at the output gear position in the gearbox, and the output gear is connected to the output shaft through the clutch assembly. The clutch assembly is integrated at one end of the output gear and does not occupy additional space in the housing. At the same time, the brake assembly is connected to the output shaft, and along the axial direction of the output shaft, the brake assembly and the clutch assembly are overlapped. The operation of the brake assembly can be driven to a certain extent by the clutch action of the clutch assembly, thereby realizing the linkage control of the brake assembly and the clutch assembly.

[0017] The multifunctional gearbox integrates the clutch assembly and the brake assembly, reducing the number of independent control units and lowering the complexity of the system. The gear set, clutch assembly and brake assembly are integrated into a shared housing space, which optimizes the coordination of the three movements, avoids the complex and lengthy setting of the transmission system, simplifies the control route, and has a positive impact on the weight control of agricultural tractors. At the same time, there is no need to manufacture the clutch assembly and brake assembly as individual devices, which can effectively reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of a multifunctional gearbox.

[0019] Figure 2It is a structural diagram of the gear set.

[0020] Figure 3 A side cross-sectional view of the gear set.

[0021] Figure 4 It is a side sectional view of the output shaft position structure.

[0022] Figure 5 It is a structural diagram of the output shaft and output gear position.

[0023] Figure 6 Schematic diagram of the exploded structure showing the position of the output shaft and output gear.

[0024] In the figure: 1. Multifunctional gearbox; 10. Housing; 20. Output shaft; 30. Gear set; 31. Input gear; 32. Intermediate transmission gear; 33. Output gear; 331. Protrusion; 34. First bearing structure; 35. Second bearing structure; 40. Clutch assembly; 41. Clutch plate; 411. First clutch plate; 412. Second clutch plate; 42. Driving member; 421. Fixed block; 422. Hydraulic driving block; 423. Abutment block; 43. Friction plate; 50. Brake assembly; 51. Fixed disk; 52. Brake disk; 60. Elastic member; 71. First gap; 72. Hydraulic chamber; 80. Clutch oil circuit one-way valve. DETAILED DESCRIPTION

[0025] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0026] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, the directions and positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0027] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0028] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0029] In a preferred embodiment, see Figures 1 to 6 The present application document provides a multifunctional gearbox 1, comprising: a housing 10, an output shaft 20; a gear set 30, the gear set 30 being arranged in the housing 10, the gear set 30 comprising an input gear 31, at least one intermediate transmission gear 32 and an output gear 33; a clutch assembly 40, one end of the clutch assembly 40 being connected to the output gear 33, and the other end being used to connect to the output shaft 20; a brake assembly 50, the brake assembly 50 being connected to the output shaft 20, the brake assembly 50 being linked to the clutch assembly 40, and the brake assembly 50 being driven to operate by the clutch assembly 40.

[0030] The multifunctional gearbox 1 of this application is preferably used in an agricultural tractor. The gearbox transmits engine power through the gears, reducing the engine speed and increasing tire torque. Furthermore, depending on actual use, the clutch assembly 40 is controlled to connect or disconnect to control whether the agricultural tractor is moving. When the agricultural tractor is parked, a brake assembly 50 is provided within the gearbox to provide braking force to prevent the tractor from sliding and slipping, ensuring safety.

[0031] Therefore, based on the above functions, in the gear box provided in the present application document, the gear set 30 is provided in the housing 10, see Figure 2 and Figure 3The input gear 31 of the gear set 30 is used to connect to the engine of the agricultural tractor, and then transmit the power to the output gear 33 through the multi-stage intermediate transmission gear 32. Preferably, the gear set 30 in the present application document is provided with a two-stage intermediate transmission gear 32 to reduce the speed and increase the torque, and the output gear 33 is connected to the intermediate transmission gear 32, thereby realizing an essential function of the multifunctional gearbox 1 in the present application document. At the same time, a clutch assembly 40 is provided at the position of the output gear 33 in the gearbox, and the output gear 33 is connected to the output shaft 20 through the clutch assembly 40. The output gear 33 is preferably a gear with meshing teeth on the inner wall of the gear, and then the meshing teeth on the outer wall of the output gear 33 mesh with the intermediate transmission gear 32, and mesh with the clutch assembly 40 through the meshing teeth on the inner wall of the output gear 33. Therefore, the clutch assembly 40 is integrated at one end of the output gear 33 and does not occupy additional space. The space inside the shell 10, at the same time, the brake assembly 50 is connected to the output shaft 20, and along the axial direction of the output shaft 20, the brake assembly 50 and the clutch assembly 40 are overlapped. The clutch action of the clutch assembly 40 can drive the operation of the brake assembly 50 to a certain extent, thereby realizing the linkage control of the brake assembly 50 and the clutch assembly 40. Therefore, the gearbox provided in the present application document integrates the clutch assembly 40 and the brake assembly 50 in linkage, reduces the independent control unit, and reduces the complexity of the system. The gear set 30, the clutch assembly 40, and the brake assembly 50 are integrated to share the space of the shell 10, optimizes the coordination of the three actions, avoids the complex and lengthy setting of the transmission system, and simplifies the control route, which has a positive impact on the weight control of the agricultural tractor. At the same time, there is no need to manufacture the clutch assembly 40 and the brake assembly 50 as individual devices, which can effectively reduce the production cost.

[0032] As a preferred embodiment, the clutch assembly 40 includes a clutch plate 41 and a driving member 42. The inner end of the clutch plate 41 is sleeved on the outer wall of the output shaft 20 and is used to connect with the output shaft 20. The outer end of the clutch plate 41 is used to connect with the output gear 33. The driving member 42 is driven and connected to the clutch plate 41; when the driving member 42 is pressurized, the clutch plate 41 is forced to be tightly connected with the output shaft 20 and the output gear 33, and the clutch assembly 40 is in a power output state; when the driving member 42 is depressurized, the drive to the clutch plate 41 is released, and the connection between the clutch plate 41 and the output shaft 20 and the output gear 33 is separated, and the clutch assembly 40 is in a power cut-off state.

[0033] Specifically, see Figure 4, both side ends of the output shaft 20 are provided with a first bearing structure 34, and the first bearing structure 34 is arranged between the housing 10 and the output shaft 20. At the same time, since the output gear 33 needs to bear a large torque load force, the inner wall of the gear body part of the output gear 33 set in the present application document is not provided with meshing teeth, and the inner wall of the gear body part is connected to the output shaft 20 through the second bearing structure 35. The protrusion 331 of the output gear 33 is provided with meshing teeth arranged along the circumference of the inner wall, and is connected to the clutch plate 41 through the protrusion 331 of the output gear 33, thereby ensuring that the output gear 33 has a large thickness, and the second bearing structure 35 can share the tangential force generated by the output gear 33 and the clutch plate 41 after meshing. At this time, the output gear 33 can bear a large torque output and is not easy to collapse through this structural setting.

[0034] As another preferred option, see Figure 4 and Figure 6 The clutch plates 41 include multiple groups of first clutch plates 411 and multiple groups of second clutch plates 412. The multiple groups of first clutch plates 411 and the multiple groups of second clutch plates 412 are arranged alternately and spaced apart. The first clutch plates 411 and the second clutch plates 412 are both provided with latching teeth at one end; the end latching teeth of the first clutch plates 411 are connected to the output gear 33, and the end latching teeth of the second clutch plates 412 are connected to the output shaft 20. The end of the clutch plate 41 is connected to the driving member 42, and the driving member 42 drives the multiple groups of first clutch plates 411 and the multiple groups of second clutch plates 412 to be fastened together, so that the clutch assembly 40 is in a power output state.

[0035] Among them, the driving member 42 is preferably driven by a hydraulic oil pump, and the hydraulic oil pump can be integrated outside the housing 10. When the gearbox is in the power output state, the driving member 42 moves axially to the left along the output shaft 20. At this time, the first clutch plate 411 and the second clutch plate 412, which are arranged alternately, are squeezed by the driving member 42. Since the first clutch plate 411 is connected to the output gear 33 through the end teeth and rotates synchronously with the output gear 33, the second clutch plate 412 is connected to the output shaft 20 through the end teeth. When the two sets of clutch plates 41 are compressed, the friction force causes the first clutch plate 411 and the second clutch plate 412 to rotate synchronously, and then the output shaft 20 rotates synchronously with the output gear 33. The power is transmitted from the engine as the input side to the output gear 33 through the gear set 30, and is transmitted to the output shaft 20 through the first clutch plate 411 and the second clutch plate 412 to realize power output.

[0036] Preferably, see Figures 4 to 6The driving member 42 includes a fixed block 421, a hydraulic driving block 422 and an abutting block 423. The three are located on the outer wall of the output shaft 20 and are arranged in sequence along the axial direction. One end of the abutting block 423 is used to connect with the clutch plate 41. The fixed block 421 is fixed against the end bearing of the output shaft 20. A hydraulic chamber 72 is formed between the hydraulic driving block 422 and the fixed block 421. Hydraulic oil is input into the hydraulic chamber 72 through the hydraulic driving pump to drive the hydraulic driving block 422 to push the abutting block 423, so that the abutting block 423 presses against the first clutch plate 411 and the second clutch plate 412.

[0037] The multifunctional gearbox 1 also includes an elastic member 60, one end of which is embedded in the output shaft 20, and the elastic member 60 extends along the axial direction of the output shaft 20 to abut against the hydraulic drive block 422; wherein, when the hydraulic drive pump releases pressure in the hydraulic chamber 72, the elastic member 60 pushes the hydraulic drive block 422 to move away from the clutch plate 41, so that the abutment block 423 cancels the fastening abutment on the clutch plate 41.

[0038] Specifically, when it is necessary to cut off the power, such as when the tractor stops or shifts gears, the hydraulic oil pump stops supplying oil, the oil circuit is relieved through the return oil valve, and the oil chamber pressure at the position of the hydraulic drive block 422 disappears. At this time, the drive block loses its axial thrust and returns to its initial position under the action of the return spring, that is, the elastic member 60. The pressure between the first clutch plate 411 and the second clutch is released, and the first clutch plate 411 and the second clutch plate 412 move to the right and separate. The two sets of plates each rotate freely with the output gear 33 and the output shaft 20. At this time, there is no friction transmission and the power transmission path is disconnected.

[0039] Therefore, the clutch structure formed by hydraulic drive and staggered tooth connection in this application document is highly compatible with the overall design goal of the multi-functional integrated gearbox. The annular oil chamber of the hydraulic drive block 422 can generate uniform axial thrust, ensuring that multiple groups of staggered clutch plates 41 are subjected to consistent force, avoiding local wear or slipping, and improving power transmission efficiency.

[0040] The combination of the staggered clutch plates 41 and the axial hydraulic drive blocks 422 can be compactly arranged along the axis of the output shaft 20 without requiring additional radial space, forming a coaxial integration with the gear set 30 and the brake assembly 50, directly supporting the multifunctional integration goal of the gearbox.

[0041] Furthermore, the multifunctional gearbox 1 also includes a clutch oil circuit one-way valve 80, which is arranged at the end of the output shaft 20 close to the fixed part. The clutch oil circuit one-way valve 80 is connected to the hydraulic chamber 72, and the oil chamber pressure is locked by the clutch oil circuit one-way valve 80 in the clutch oil circuit to ensure that the clutch plate 41 is continuously fitted during power transmission to avoid slipping due to pressure fluctuations.

[0042] Specifically, to further protect the tractor's transmission components, such as gears, bearings, and belts, from damage during overload, a friction plate 43 is interposed between any adjacent first clutch plates 411 and second clutch plates 412. The friction plate 43 has an upper friction limit to provide torque limitation for the clutch assembly 40. In the related art, friction transmission and torque limitation of the clutch are two independent functions, requiring separate clutch plate 41 sets and torque limiters. However, the present structure integrates the clutch assembly 40 and torque limitation through the provision of the friction plate 43. The friction plate 43 serves as both a power transmission medium between the clutch plates 41, achieving synchronous rotation of the first and second clutch plates 411, 412 through friction, and a core element for torque limitation. By utilizing its upper friction limit, when the load torque exceeds a preset threshold, the plates naturally slip, preventing damage to the output shaft 20 caused by excessive torque. The preset threshold is determined by the upper friction limit corresponding to the hydraulic pressure. The gearbox in this application document can achieve the torque limiter function without requiring additional components.

[0043] Preferably, the brake assembly 50 includes a fixed disc 51 and a brake disc 52, the fixed disc 51 is fixed in the housing 10 and is arranged near one end of the fixed block 421; the brake disc 52 is arranged on the outer periphery of the hydraulic drive block 422 toward the axial edge of the output shaft 20, and the brake disc 52 is arranged to protrude toward the side of the fixed disc 51, and the brake disc 52 and the hydraulic drive block 422 are integrally formed; wherein, when the clutch assembly 40 is in a power-cut-off state, the elastic member 60 pushes the hydraulic drive block 422 to drive the brake disc 52 to insert into the fixed disc 51 to achieve a braking effect on the output shaft 20.

[0044] Among them, in the initial state of the component, that is, when it is not in the braking state, and the clutch assembly 40 is in the engaged power output state, the fixed disc 51 is fixed to the inner wall of the gearbox housing 10, and the fixed block 421 near the end of the output shaft 20 is a support boss for the brake disc 52. The side of the fixed disc 51 facing the brake disc 52 is provided with an annular groove or friction surface to facilitate matching with the flange of the brake disc 52; the brake disc 52 abuts against the outer periphery of the hydraulic drive block 422, and the end of the brake disc 52 facing the fixed disc 51 is a conical or annular flange structure. In the initial state, the brake disc 52 and the fixed disc 51 maintain a gap; the elastic member 60 is a compression spring evenly distributed along the circumference of the hydraulic drive block 422, one end of which abuts the inner hole of the output shaft 20, and the other end is connected to the hydraulic drive block 422. It is in a pre-compression state under normal conditions to store the reset force.

[0045] Therefore, when the braking action is triggered, the clutch assembly 40 needs to transition from a power output state to a power cutoff state. At this time, the hydraulic system is depressurized, and the hydraulic oil that drives the clutch plate 41 to engage is discharged from the hydraulic chamber 72. The hydraulic drive block 422 loses its axial thrust, and the elastic member 60 is reset. The pre-compressed elastic member 60 releases its elastic force, pushing the hydraulic drive block 422 to move axially toward the fixed plate 51. The hydraulic drive block 422 drives the outer peripheral brake disc 52 to move synchronously, so that the flange of the brake disc 52 is inserted into the groove of the fixed plate 51, thereby tightly fitting with the fixed plate 51. The brake disc 52 is then stopped by mechanical friction or engagement between the brake disc 52 and the fixed plate 51. Since the hydraulic drive block 422 and the output shaft 20 can increase the sheathing friction by means of a friction ring, a rubber ring, or a composite material brake pad, the inertial rotation of the output shaft 20 after the clutch plate 41 is disengaged will also stop as the hydraulic drive block 422 stops, thereby achieving braking of the output shaft 20.

[0046] At the same time, for example, when agricultural tractors are working, such as when changing farm tools, the driver gets off the vehicle or parks, the brakes are automatically triggered after the clutch is disengaged, which can prevent the vehicle from slipping on slopes or uneven ground.

[0047] Furthermore, a first gap 71 is provided between the hydraulic drive block 422 and the output shaft 20. The first gap 71 provides a transition section for the elastic member 60 to extend from the output shaft 20 to the hydraulic drive block 422. When the hydraulic drive block 422 moves rapidly under the action of hydraulic thrust or the elastic force of the elastic member 60, such as when the clutch is quickly engaged or disengaged, the first gap 71 can provide a small buffer distance to avoid direct rigid collision between the output shaft 20 and the hydraulic drive block 422.

[0048] At the same time, the cross-section of the hydraulic chamber 72 is arranged in a Z-shaped structure. Since the brake disc 52 needs to be arranged on the outer periphery of the hydraulic drive block 422 and the inner side needs to be close to the clutch plate 41, the space inside the hydraulic chamber 72 is extremely compact. Therefore, under the premise that the hydraulic drive block 422 does not interfere with adjacent components, the space inside the drive block can be maximized.

[0049] Therefore, in a complete control process, when the gearbox described in this application document is used in a typical agricultural tractor, while the tractor is in normal operation in the field, the engine operates normally, driving the input gear 31 to rotate. The input gear 31 drives the output gear 33 to rotate through the multi-stage intermediate transmission gear 32. The hydraulic oil pump operates normally to supply hydraulic oil to the hydraulic chamber 72, pushing the clutch plate 41 to press against each other through the hydraulic drive block 422. At this time, the first clutch plate 411 and the second clutch plate 412 in the clutch assembly 40 are pressed against each other. Next, the overload situation and the torque limit are described. The operation of the clutch assembly 40 during normal shifting are described. Finally, the operation of the brake assembly 50 during braking is described. First, the first clutch plate 411 and the second clutch plate 412 are separated. Then, while the output shaft 20 still has a certain amount of inertial rotation, the brake disc 52 is embedded in the fixed disc 51, thereby stopping the output shaft 20.

[0050] When an agricultural tractor is operating normally in a field, the entire gearbox system is in a stable power transmission state: engine power is transmitted via the input shaft to the input gear 31 of the gearbox body. The input gear 31 then transmits this power step by step to the output gear 33 via two intermediate transmission gears 32, achieving a simultaneous increase in torque and a reduction in speed. At this time, the hydraulic oil pump continuously supplies oil to the hydraulic chamber 72 of the clutch assembly 40. The hydraulic oil in the hydraulic chamber 72 generates axial thrust, pushing the hydraulic drive block 422 axially toward the clutch plate 41, thereby driving the contact block 423 to move synchronously. Because the first clutch plate 411 is meshed with the output gear 33 via its end teeth, it rotates synchronously with the output gear 33. The second clutch plate 412 is meshed with the output shaft 20 via its end teeth. Therefore, under the pressure of the hydraulic drive block 422, the staggered first and second clutch plates 411, 412 are tightly fitted together. The friction between them transmits the power of the output gear 33 to the output shaft 20, ultimately driving the tractor wheels. At this time, the elastic member 60 is in a compressed state, a gap is maintained between the brake disc 52 and the fixed disc 51 , the brake assembly 50 is in a standby state, and the torque limit is in a standby state based on the friction threshold of the friction plate 43 .

[0051] When an agricultural tractor encounters an overload condition, such as when the plowshare sinks into a hard block of soil during plowing, or when the wheels run over a stone, causing a sudden increase in load, the torque limiting function is automatically triggered. At this time, the resistance torque on the output shaft 20 instantly exceeds the preset friction threshold of the friction plate 43. This threshold is determined by the material of the friction plate 43 and the pressure in the hydraulic chamber 72. The first clutch plate 411 and the second clutch plate 412 begin to slip relative to each other due to insufficient friction. At this time, the first clutch plate 411 continues to rotate with the output gear 33, while the second clutch plate 412 decreases with the speed of the output shaft 20. The relative sliding between the two cuts off part of the power transmission, so that the torque transmitted to the output shaft 20 is limited to a safe range.

[0052] During a normal shift, the hydraulic pump stops supplying oil, and the hydraulic drive block 422 loses its axial thrust. Under the restoring force of the elastic member 60, the hydraulic drive block 422 retracts axially, causing the first and second clutch plates 411, 412 to lose their compressive force and separate, terminating the power transmission path between them. At this point, the input gear 31 still drives the output gear 33 via the intermediate transmission gear 32, effectively idling. However, the output gear 33 cannot drive the output shaft 20 via the clutch plate 41, causing the output shaft 20's speed to gradually decrease. After the shift gear set 30 is fully engaged, such as when shifting from a low gear to a high gear, the hydraulic pump restarts supplying oil, causing the pressure in the hydraulic chamber 72 to rise again. The hydraulic drive block 422 pushes the clutch plate 41 again, compressing it. The first and second clutch plates 411, 412 resume synchronous rotation, and power is transmitted to the wheels via the output shaft 20, completing the shift.

[0053] When braking is required, the brake assembly 50 and clutch assembly 40 interact. First, the hydraulic drive block 422 is reset and retracted via the elastic member 60, disengaging the first clutch plate 411 from the second clutch plate 412, interrupting power transmission between the output gear 33 and the output shaft 20. However, the output shaft 20 continues to rotate due to inertia. Especially when the tractor is on a slope or has significant inertia, the elastic member 60 pushes the hydraulic drive block 422 back, simultaneously driving the brake disc 52, which is integrally formed with the hydraulic drive block 422, axially. The flange of the brake disc 52 gradually approaches and engages the groove of the fixed disc 51, where the friction surfaces of the two tightly engage and generate braking force. As the brake disc 52 and the fixed disc 51 continue to rub against each other, the inertial rotation of the output shaft 20 is gradually offset, eventually stopping the output shaft 20 completely.

[0054] The above describes the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A multifunctional gearbox, characterized in that: include: Housing, output shaft; A gear set, the gear set being disposed in the housing and comprising an input gear, at least one intermediate transmission gear, and an output gear; a clutch assembly, one end of the clutch assembly being connected to the output gear and the other end being connected to the output shaft; A brake assembly is connected to the output shaft, and the brake assembly is linked to the clutch assembly, and the brake assembly is driven to operate by the clutch assembly.

2. The multifunctional integrated gearbox according to claim 1, characterized in that: The clutch assembly includes a clutch plate and a driving member, wherein the inner end of the clutch plate is sleeved on the outer wall of the output shaft and is used to be connected to the output shaft, the outer end of the clutch plate is used to be connected to the output gear, and the driving member is drivingly connected to the clutch plate; When the driving member is pressurized and driven, the clutch plate is forced to be tightly connected with the output shaft and the output gear, and the clutch assembly is in a power output state; When the driving member releases pressure, the drive to the clutch plate is released, and the connection between the clutch plate and the output shaft and the output gear is disconnected, so that the clutch assembly is in a power-off state.

3. The multifunctional integrated gearbox according to claim 2, characterized in that: The clutch plates include multiple groups of first clutch plates and multiple groups of second clutch plates, the multiple groups of first clutch plates and the multiple groups of second clutch plates are arranged alternately and spaced apart, and the first clutch plates and the second clutch plates are each provided with a latching tooth on one end thereof; The end teeth of the first clutch plate are connected to the output gear, the end teeth of the second clutch plate are connected to the output shaft, and the end of the clutch plate is connected to the driving member. The driving member drives multiple groups of the first clutch plates and multiple groups of the second clutch plates to be fastened together, so that the clutch assembly is in a power output state.

4. The multifunctional integrated gearbox according to claim 3, characterized in that: A friction plate is further sandwiched between any adjacent first clutch plate and second clutch plate; The friction plate has an upper friction limit to provide torque limitation for the clutch assembly.

5. The multifunctional integrated gearbox according to claim 3, characterized in that: The driving member includes a fixed block, a hydraulic driving block and an abutment block, which are located on the outer wall of the output shaft and arranged in sequence along the axial direction. One end of the abutment block is used to connect with the clutch plate, and the fixed block is fixedly abutted against the end bearing of the output shaft. A hydraulic cavity is formed between the hydraulic driving block and the fixed block. Hydraulic oil is input into the hydraulic cavity through a hydraulic driving pump to drive the hydraulic driving block to push the abutment block, so that the abutment block presses against the first clutch plate and the second clutch plate.

6. The multifunctional integrated gearbox according to claim 5, characterized in that: It also includes an elastic member, one end of which is embedded in the output shaft and extends along the axial direction of the output shaft to abut against the hydraulic drive block; When the hydraulic drive pump releases pressure from the hydraulic chamber, the elastic member pushes the hydraulic drive block to move away from the clutch plate, so that the abutment block cancels the fastening abutment against the clutch plate.

7. The multifunctional integrated gearbox according to claim 6, characterized in that: The brake assembly includes a fixed disc and a brake disc, wherein the fixed disc is fixed in the housing and is arranged close to one end of the fixed block; The brake disc is arranged on the outer periphery of the hydraulic drive block at a convex edge facing the axial direction of the output shaft, and the brake disc is arranged convexly toward the side of the fixed disc; Wherein, when the clutch assembly is in a power-off state, the elastic member pushes the hydraulic drive block to drive the brake disc to insert into the fixed disc to achieve a braking effect on the output shaft.

8. The multifunctional integrated gearbox according to claim 7, characterized in that: The end portion of the brake disc facing the fixed disc is tapered.

9. The multifunctional integrated gearbox according to claim 6, characterized in that: A first gap is provided between the hydraulic drive block and the output shaft, and the first gap provides a transition section for the elastic member to extend from the output shaft to the hydraulic drive block.

10. The multifunctional integrated gearbox according to claim 5, characterized in that: It also includes a clutch oil circuit one-way valve, which is arranged at the end of the output shaft close to the side of the fixing member, and the clutch oil circuit one-way valve is connected to the hydraulic chamber.

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