An integrated power take-off device for a combine harvester for configuring a longitudinal axis flow threshing and separating cylinder

Abstract

The application discloses a kind of integrated power output device for configuring longitudinal axis flow threshing separation cylinder of combine harvester, it is characterized by comprising: multiple power shunt transmission spline connection mechanism, cylindrical gear transmission mechanism, main operation clutch, main operation power output pipe shaft, bevel gear transmission mechanism, first belt pulley transmission mechanism, second belt pulley transmission mechanism, main transmission box, sub transmission box, closed bearing cover and each supporting bearing seat, bearing etc.;The multiple power transmission spline connection mechanism is set to device input and is connected with the torsional damper of engine;The power walking driving gear of cylindrical gear transmission mechanism obtains input power by spline connection, and the power input shaft of output end connection hydraulic walking driving pump;The main operation clutch is placed in main operation transmission route input end;The output end of bevel gear transmission mechanism is installed threshing stepless speed change driving wheel.The application relates to the technical field of combine harvester engine power output device, especially to a kind of multiple power output integrated transmission device for configuring longitudinal axis flow threshing separation cylinder of the matching engine of combine harvester, the application has the following advantages, one, the high-efficiency energy-saving design of reducing transmission number of stages;Two, main operation clutch is placed in transmission box safely and reliably;Three, walking, operation power shunt device integration simplification.

Description

Technical Field

[0001] This invention relates to the field of power output devices for combine harvester engines, and particularly to an integrated transmission device for multi-path power output of a combine harvester engine equipped with a longitudinal axial flow threshing and separating drum. Background Technology

[0002] Combine harvesters need to simultaneously complete multiple operations such as cutting, conveying, threshing, cleaning, straw chopping and spreading, and unloading while traveling. Due to differences in speed requirements and dispersed layout, the various working parts cannot directly obtain power from the engine and need to achieve power distribution through a dedicated power output device. Furthermore, continuously variable transmission is required for traveling and key operation stages to optimize the operation effect.

[0003] With the increasing size of combine harvesters in my country, longitudinal axial flow threshing and separating devices have become the main structural form of grain separation devices in large combine harvesters. However, the transmission systems used in most mainstream longitudinal axial flow threshing and separating drum combine harvesters in China are still adapted from the original tangential flow or transverse axis threshing and separating drum combine harvesters. Their engine power output mainly adopts a decentralized form of "walking hydraulic drive pump + working pulley". This type of transmission system has several drawbacks: the main working clutch is prone to damage, leading to significant damage to other components of the combine harvester; the number of power-consuming working transmission stages increases, and the output power speed decreases initially and then increases, resulting in a complex structure and reduced transmission efficiency; the working power transmission method is mainly belt drive, which has low transmission efficiency and is prone to wear; and separate output devices for walking power and working power increase the space occupied by the transmission mechanism and the overall weight of the machine, correspondingly increasing manufacturing costs.

[0004] Internationally, large-scale longitudinal axial flow combine harvesters mostly employ integrated power take-off devices with dedicated gearboxes suitable for longitudinal axial flow threshing and separating equipment. Compared to my country's mainstream decentralized output scheme of "walking hydraulic drive pump + working pulley," this offers advantages such as safety, efficiency, convenient maintenance, and environmental reliability. However, foreign integrated solutions suffer from problems such as complex overall transmission structures, high difficulty in machining precision parts, unreasonable speed matching, and poor compatibility with the overall transmission structure of domestically produced models. Although the decline in the manufacturing cost of hydraulic continuously variable transmission components in China has driven the replacement of traditional mechanical drives with walking hydraulic drives, decentralized outputs still face technical bottlenecks due to their dispersed mechanisms and higher manufacturing costs. Therefore, the industry's demand for integrated power units is becoming increasingly urgent.

[0005] Given the structural characteristics, manufacturing capabilities, and user cost acceptance of domestically produced longitudinal axial flow combine harvesters, directly transplanting foreign technical solutions would lead to high manufacturing costs and difficulty in adapting to the speed and efficiency requirements of existing models. Therefore, developing a power output transmission device suitable for the overall layout of the transmission structure of domestically produced longitudinal axial flow combine harvesters, enabling multi-path output of engine power to the traveling and multiple working devices, and achieving good matching in terms of structure, speed, and efficiency, has become an urgent technical problem to be solved. Summary of the Invention

[0006] In view of this, the present invention aims to provide a multi-path power output transmission device for a combine harvester engine to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial option.

[0007] The technical solution of this invention is implemented as follows: An integrated power output device for a combine harvester with a longitudinal axial flow threshing and separating drum includes a transmission spline connection mechanism for multi-path power splitting, a cylindrical gear transmission mechanism for transmitting power from a hydraulic travel drive pump that provides power for the combine harvester's movement, a main operating clutch for engaging or disengaging power transmission between the main operating devices of the combine harvester and the engine, a bevel gear transmission mechanism for providing power to the threshing and separating device of the combine harvester, a first pulley transmission mechanism for providing power to the main operating devices of the combine harvester such as the header, cleaning, grain lifting, straw chopping and spreading, a second pulley transmission mechanism for providing power to the unloading device, a main transmission housing, a sub-transmission housing, a sealed bearing cover and various support bearing seats, bearings, etc. The power output device is used to provide power for the combine harvester's movement and operation. The power from the combine harvester's engine is divided into three paths after passing through the multi-path power splitting transmission spline connection mechanism of the power output device, and output to the combine harvester's movement and each operation device respectively. A transmission belt branch can be connected in series after the power drive shaft of the hydraulic movement drive pump or the first belt pulley transmission mechanism, or a second power output gear at the required output speed can be added to the cylindrical gear transmission mechanism to transmit power to the hydraulic pump, which provides pressurized hydraulic oil flow to the working elements of the combine harvester's hydraulic system. The cylindrical gear transmission mechanism that transmits power to the hydraulic travel drive pump that provides power for the combine harvester increases the engine speed to the speed required by the hydraulic travel drive pump, drives the power input shaft of the hydraulic travel drive pump to rotate, and generates a high-pressure hydraulic oil flow required to drive the hydraulic motor. The high-pressure hydraulic oil flow passes through the hydraulic motor, drives the output shaft of the hydraulic motor to rotate, and then drives the combine harvester travel gearbox to drive the combine harvester to travel. The power from the combine harvester engine, which is used to provide the main operation of the combine harvester, is divided into two paths after passing through the transmission spline connection mechanism, the main operation clutch, and the main operation power output tube shaft. The power is then output to the combine harvester threshing and separating device and other main operation devices. The bevel gear transmission mechanism that provides power to the threshing and separating device of the combine harvester reduces the rotational speed to the speed required by the continuously variable transmission drive wheel that provides power to the threshing and separating device of the combine harvester, and then transmits the power to the threshing and separating drum via the continuously variable transmission belt transmission mechanism and the drum transmission box to complete the threshing and separating operation of the crop harvested by the combine harvester. The first belt pulley transmission mechanism, which provides power to other main working devices of the combine harvester, transmits one path of the engine power to the intermediate transmission shaft, which provides power to the header, cleaning, grain lifting and other working devices, through the transmission belt at an appropriate reduced speed. The intermediate transmission shaft then transmits the power to the header, cleaning, grain lifting and other working devices respectively. The other path transmits the engine power to the transmission mechanism of the straw chopping and spreading device, which requires higher speed operation, through the transmission belt, to carry out straw chopping and spreading operations. The second belt pulley transmission mechanism, which provides power to the unloading device of the combine harvester, transmits the engine power to the unloading device transmission mechanism through the transmission belt to unload the grain stored in the grain bin. The optional hydraulic pump, which provides pressurized hydraulic oil flow to the working components of the whole machine's hydraulic system, can be connected in series with the power drive shaft of the hydraulic walking drive pump or the first belt pulley transmission mechanism, with a transmission belt branch connected in series after it, or a second power output gear at the required output speed can be added to the cylindrical gear transmission mechanism to introduce the power required by the hydraulic pump and convert the input rotational kinetic energy into pressurized hydraulic oil flow output by the hydraulic pump.

[0008] Preferably, the multi-path power splitting transmission spline connection mechanism of the power output device is set at the input end of the power output device, which divides the power input from the engine into three paths, which are respectively output to the combine harvester's traveling and each main working device and the grain unloading device. A main working clutch is set on one of the power outputs to each main working device, which serves as the main clutch for power transmission between the engine and each main working device of the combine harvester. The engagement and disengagement of the power output from the engine by each main working device of the combine harvester are realized through the clutch control device.

[0009] Preferably, the threshing power output shaft of the bevel gear transmission mechanism used to provide power to the threshing and separating device of the combine harvester is directly connected to the threshing continuously variable transmission drive wheel.

[0010] Preferably, the external spline of the input end of the unloading power output shaft of the second belt pulley transmission mechanism, which provides power to the unloading device of the combine harvester, is fixedly mounted to the internal spline of the transition connecting sleeve, and is connected to the internal spline of the clutch input end of the main working clutch through the external spline of the transition connecting sleeve; at the same time, the shaft head of the input end of the unloading power output shaft is inserted into the power input shaft through the positioning bushing for shaft center positioning.

[0011] Preferably, the cylindrical gear transmission mechanism used to provide power for the movement of the combine harvester can be equipped with a second power output gear as needed to output a second path of power for the sub-transmission.

[0012] Preferably, the main transmission housing and the sub-transmission housing used for supporting the transmission components of the power output device can also be manufactured as a single integrated housing as needed.

[0013] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions: I. High-efficiency and energy-saving design with reduced transmission stages: A special bevel gear transmission mechanism was designed for the longitudinal axial flow threshing and separating drum, which consumes a lot of energy. The threshing power output shaft of the bevel gear transmission mechanism is directly connected to the threshing continuously variable transmission drive wheel. The first belt pulley transmission mechanism is directly connected to the high-speed operating power output through belt drive. Both of these operating power sources reduce the number of transmission stages and avoid the unnecessary power consumption caused by the first decrease and then increase of speed in the high-speed operating power transmission, thus achieving high efficiency and energy saving in power transmission.

[0014] II. The main operating clutch is safely and reliably located inside the transmission box: Currently, domestic combine harvesters all use belt-tensioned clutches for their main operating clutches. The clutch's supporting bearings are lubricated with grease, which has poor lubrication properties, and the clutch is placed on a high-speed transmission belt. If maintenance is not timely, malfunctions and damage are highly likely. Furthermore, damage to the main operating clutch can lead to extensive damage to surrounding components and even safety accidents. By placing the main operating clutch inside the transmission box of the power take-off unit, and lubricating the related supporting bearings with the box's own lubricating oil, component failures and safety accidents are avoided, thus improving reliability.

[0015] 3. Simplified integration of walking and working power distribution devices: The walking drive and various working power were previously output separately from the "walking hydraulic drive pump + working pulley". This has been improved to be integrated into a single transmission output device, which further simplifies the spatial layout of the overall transmission system, reduces manufacturing costs, and simplifies maintenance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the transmission structure of an integrated power output device for a combine harvester with a longitudinal axial flow threshing and separating drum, according to the present invention. Figure 2 This is a cross-sectional view illustrating the transmission structure principle of an integrated power output device for a combine harvester with a longitudinal axial flow threshing and separating drum, according to the present invention. Figure 3 This is a connection structure diagram of a multi-path power splitting transmission spline connection mechanism for an integrated power output device for a combine harvester with a longitudinal axial flow threshing and separating drum, according to the present invention. Figure 4 A cross-sectional view illustrating the transmission structure principle of an integrated power output device for a combine harvester with a longitudinal axial flow threshing and separating drum, according to the present invention, which adds a second power output gear. Reference numerals: 1. Engine; 2. Flywheel; 3. Torsional damper; 4. Sealed bearing cover; 5. Travel power output gear; 6. Travel power output pipe shaft; 7. Hydraulic travel drive pump; 8. Intermediate transmission gear; 9. Sub-transmission housing; 10. Support bearing seat; 11. Main working clutch; 12. Main transmission housing; 13. Main working power output pipe shaft; 14. Driving bevel gear; 15. Pulley I; 16. Pulley II; 17. Driven bevel gear; 18. Threshing power output shaft; 19. Grain unloading power output shaft; 20. Threshing continuously variable transmission drive wheel; 21. Main working clutch input end; 22. Travel power drive gear; 23. Power input shaft; 24. Transition connecting sleeve; 25. Positioning bushing; 26. Second power output gear. Detailed Implementation

[0018] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention.

[0019] Therefore, the accompanying drawings and descriptions are considered to be exemplary rather than limiting in nature.

[0020] It is important to note that terms such as "first," "second," "symmetric," and "array" are used only to distinguish between descriptive and positional descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified with "first," "symmetric," etc., may explicitly or implicitly include one or more of that feature; similarly, when the quantity of certain features is not limited by words such as "two" or "three," it should be noted that such features also explicitly or implicitly include one or more features. In this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "fixation" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, a direct connection, a welding connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the accompanying drawings and specific circumstances.

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] like Figure 1-3 As shown, this invention provides an integrated power output device for a combine harvester equipped with a longitudinal axial flow threshing and separating drum. It includes a transmission spline connection mechanism for multi-path power splitting between the device and engine 1; a cylindrical gear transmission mechanism for transmitting power to a hydraulic travel drive pump 7 that provides power for the combine harvester's movement; a main operating clutch 11 for engaging or disengaging power transmission to the main operating devices; a bevel gear transmission mechanism for providing power to the combine harvester's threshing and separating device; a first pulley transmission mechanism for providing power to the combine harvester's header, cleaning, grain lifting, straw chopping, and spreading devices; and a second pulley transmission mechanism for providing power to the unloading device. The power output device provides power for the combine harvester's movement and operation. Power from the combine harvester engine 1 is split into three paths after passing through the multi-path power splitting transmission spline connection mechanism of the power output device, and output to the combine harvester's movement and each operating device respectively.

[0023] In this embodiment, specifically, the power output device is provided with a power input shaft 23 as the power input shaft of the engine 1, which is used to provide driving force for the combine harvester to move and for various working devices. The power input shaft 23 is connected to the torsional vibration damper 3 installed on the flywheel 2 of the engine 1, and transmits the power generated by the engine 1 to the power output device.

[0024] In this embodiment, specifically, the power output device is equipped with a transmission spline connection mechanism for multi-path power splitting of the power input from the engine 1 via the power input shaft 23. The external spline of the output end of the power input shaft 23 of this transmission spline connection mechanism is connected to the internal spline of the travel power drive gear 22 and the internal spline of the input end 21 of the main working clutch, respectively. The external spline of the transition connecting sleeve 24 is connected to the internal spline of the input end 21 of the main working clutch, and its internal spline is connected to the external spline of the input end of the unloading power output shaft 19. In this way, the transmission spline connection mechanism splits the power of the engine 1 into three paths via the cylindrical gear transmission mechanism, the main working clutch 11, and the unloading power output shaft 19 through its component splines.

[0025] In this embodiment, specifically, the power output device is equipped with a cylindrical gear transmission mechanism that transmits power to the hydraulic walking drive pump 7, which provides power for the combine harvester's movement. In the cylindrical gear transmission mechanism, the walking power drive gear 22 meshes with the intermediate transmission gear 8, which in turn meshes with the walking power output gear 5. The walking power output pipe shaft 6 is fixedly mounted to the walking power output gear 5. In this way, the walking power drive gear 22 transmits the power obtained from the engine 1 to the walking power output pipe shaft 6, and at the same time, the speed is increased to the speed required by the hydraulic walking drive pump 7. The spline inside the output end of the walking power output pipe shaft 6 is fitted with the power input shaft that drives the hydraulic walking drive pump 7, driving the hydraulic walking drive pump 7 to rotate and providing hydraulic walking drive power for the combine harvester's movement.

[0026] In this embodiment, specifically, the power output device is equipped with a main working clutch 11, which transmits the power input from the main working clutch input end 21 to the main working devices of the combine harvester for operations such as threshing, separating, header operation, cleaning, grain lifting, straw chopping, and spreading. The main working clutch 11 includes a main working clutch input end 21 connected to the power input shaft 23 via a spline, a clutch active friction plate, a clutch driven friction plate, a clutch spring, and a clutch output end. The clutch driven friction plate is connected to the external spline of the clutch output end and to the external spline of the input end of the main working power output tube shaft 13 via the internal spline of the clutch output end. The clutch active friction plate is inserted into the working clutch input end 21. When the active friction plate and the clutch driven friction plate are engaged, the power transmitted to the working clutch input end 21 is transmitted to the main working power output tube shaft 13 via the main working clutch 11, and then transmitted backward via the main working power output tube shaft 13.

[0027] In this embodiment, specifically, the power output device is equipped with a bevel gear transmission mechanism for providing power to the threshing and separating device of the combine harvester. The driving bevel gear 14 in the bevel gear transmission mechanism is fixedly mounted together with the main working power output pipe shaft 13, and transmits part of the power transmitted by the main working power output pipe shaft 13 to the driven bevel gear 17. At the same time, the speed is reduced to the suitable input speed required by the threshing and separating device of the combine harvester, and then transmitted to the threshing continuously variable transmission drive wheel 20 via the threshing power output shaft 18 fixedly mounted together with the driven bevel gear 17. The power is then transmitted to the drum transmission box that provides power to the threshing device of the combine harvester via the continuously variable transmission belt transmission mechanism, thus providing power for the threshing and most of the separating operations of the combine harvester.

[0028] In this embodiment, specifically, the power output device is equipped with a first belt pulley transmission mechanism for providing power to the main operating devices of the combine harvester, such as the header, cleaning, grain lifting, straw chopping, and spreading. The belt pulley I15 of the first belt pulley transmission mechanism is fixedly mounted to the main operating power output pipe shaft 13, and the power obtained from the main operating power output pipe shaft 13 is output in two paths. One path transmits the engine power to the intermediate transmission shaft, which provides power to the header, cleaning, grain lifting, and other operating devices, via a transmission belt, and then transmits the power to the low-speed operating devices such as the header, cleaning, and grain lifting for operation. The other path transmits the engine power directly to the transmission mechanism of the straw chopping and spreading device, which requires higher speed operation, via a transmission belt for straw chopping and spreading operations.

[0029] In this embodiment, specifically, the power output device is provided with a second belt pulley transmission mechanism for providing power to the grain unloading device. One end of the unloading power output shaft 19 in the second belt pulley transmission mechanism is inserted into the center hole of the output end of the power input shaft 23 through the positioning bushing 25 for shaft center positioning, and is connected to the transition connecting sleeve 24 through a spline to obtain power. The pulley II 16 fixed at the other end of the unloading power output shaft 19 transmits the engine power to the transmission mechanism of the grain unloading device through the transmission belt to perform grain unloading operations on the grain stored in the grain bin.

[0030] In this embodiment, specifically, the power output device is also provided with a closed bearing cover 4, a sub-transmission housing 9, a support bearing seat 10, a main transmission housing 12, and other bearings, sealing rings, etc., for sealing, supporting, and installing various transmission components.

[0031] like Figure 4 As shown in this embodiment, specifically, the power output device may be equipped with a second power output gear 26 as needed, which is used to output another branch of power from the cylindrical gear transmission mechanism.

[0032] The power transmission process of this invention during specific operation: The power output from engine 1 is transmitted to power input shaft 23 via torsional damper 3 mounted on flywheel 2 of engine 1. Power input shaft 23 distributes power to the rear transmission system through a multi-path power splitting transmission spline connection mechanism. The first power source is the walking power drive gear 22, which is splined to the power input shaft 23, and then transmitted to the walking power output gear 5 via the intermediate transmission gear 8. The speed is increased to the required operating condition of the walking drive pump 7 through a speed-increasing transmission. The end of the walking power output pipe shaft 6, which is fixed to the walking power output gear 5, is directly inserted into the power input shaft of the walking drive pump 7, driving the walking drive pump 7 to rotate and providing high-pressure hydraulic power to the combine harvester's walking system. The second power source is the main working clutch input end 21, which is connected to the power input shaft 23 via a spline. It is transmitted backward through the main working clutch 11 and the main working power output pipe shaft 13, and further distributed by the main working power output pipe shaft 13 to the threshing and separating device and other main working devices. The first branch of the main working power output shaft 13 is transmitted to the driven bevel gear 17 through the driving bevel gear 14 fixed to its outside. After being reduced to the appropriate input speed required by the combine harvester threshing and separating device, it is transmitted to the threshing continuously variable transmission drive wheel 20 through the threshing power output shaft 18 fixed together with the driven bevel gear 17. The drive wheel 20 is then transmitted to the drum transmission box that provides power to the combine harvester threshing and separating device through the continuously variable transmission belt transmission mechanism, driving the threshing and separating drum to work. The second branch power of the main working power output tube shaft 13 is transmitted through the pulley I 15 fixed at its output end and the transmission belt to the intermediate transmission shaft that provides power to the cutting platform, cleaning, grain lifting and other working devices. The power is then transmitted to the low-speed working devices such as the cutting platform, cleaning, grain lifting and other working devices for operation through the intermediate transmission shaft. The third branch of the main operating power output tube shaft 13 is transmitted directly to the transmission mechanism of the straw chopping and spreading device, which requires higher speed operation, through the pulley I 15 fixed at its output end and the transmission belt, to carry out straw chopping and spreading operations.

[0033] The third power source is the main working clutch input end 21, which is connected to the power input shaft 23 via a spline. The power is transmitted to the unloading power output shaft 19 via the transition connecting sleeve 24. After passing through the pulley II 16 at the other end of the fixed unloading power output shaft 19, the power is transmitted from the engine to the transmission mechanism of the unloading device via a transmission belt to unload the grain stored in the grain silo.

[0034] In the transmission system, the threshing power output shaft 19 of the bevel gear transmission mechanism is directly connected to the threshing continuously variable transmission drive wheel 20; the pulley I 15 is directly connected to the high-speed working power output through belt drive. These two branches of working power that consume a lot of power no longer pass through the intermediate transmission shaft that provides power to the working device, thus reducing the number of transmission stages and avoiding the unnecessary power consumption caused by the first decrease and then increase of speed in the high-speed working power transmission, thereby achieving high efficiency and energy saving in power transmission.

[0035] This power output device uses a wet friction plate type main working clutch 11, which is integrated inside the main transmission housing 12. All related support bearings of the main working clutch 11 are lubricated by lubricating oil inside the housing, which has significant advantages such as maintenance-free operation, safe use, and long service life.

[0036] This power output device integrates the walking drive and various working power into the same transmission output device, further simplifying the spatial layout of the overall transmission system, reducing manufacturing costs, and simplifying maintenance.

[0037] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An integrated power take-off device for a combine harvester configured with a longitudinal axial flow threshing and separating drum, comprising: Multi-path power split transmission spline connection mechanism, cylindrical gear transmission mechanism, main working clutch, main working power output pipe shaft, bevel gear transmission mechanism, first belt pulley transmission mechanism, second belt pulley transmission mechanism, main transmission housing, sub-transmission housing, enclosed bearing cover and each supporting bearing seat, bearing, etc. The multi-path power split transmission spline connection mechanism is located at the input end of the device and connected to the output shaft of the engine; The input end of the cylindrical gear transmission mechanism is connected to the transmission spline connection mechanism through the internal spline connection of the power walking drive gear, and the output end is connected to the power input shaft of the hydraulic walking drive pump. The input end of the main working clutch is connected to the transmission spline connection mechanism via an internal spline, and the output end is connected to the main working power output tube shaft. The input end of the bevel gear transmission mechanism is connected to the main working power output tube shaft, and the output end is connected to the belt continuously variable transmission mechanism of the threshing and separating device through the continuously variable transmission drive wheel of the threshing continuously variable transmission. The input end of the first belt pulley transmission mechanism is connected to the main operating power output shaft, and the output end is connected via a transmission belt to the intermediate transmission shaft of the header / cleaning / grain lifting device and directly to the straw chopping / scattering device. The input end of the second belt pulley transmission mechanism is connected to the transmission spline connection mechanism, and the output end is connected to the grain unloading device through the transmission belt. The output end of the hydraulic walking drive pump and the first belt pulley transmission mechanism, or by adding a second power output gear to the cylindrical gear transmission mechanism, can be connected in series to the hydraulic pump supplying oil to the whole machine's hydraulic system. The enclosed bearing cover is used to enclose the main transmission housing, separating the power output transmission device from the engine and its accessories, such as the flywheel and torsional damper, into two parts. The enclosed bearing cover can also be used to install the support bearings for the power input shaft and the drive gear of the travel power.

2. An integrated power take-off device for a combine harvester with a longitudinal axial flow threshing and separating drum as described in claim 1, characterized in that: The power input shaft is connected to a torsional damper mounted on the engine flywheel, and the power input shaft is connected to the internal spline of the power travel drive gear of the cylindrical gear transmission mechanism and the internal spline of the clutch input end of the main working clutch, respectively. The driving gear of the cylindrical gear transmission mechanism is connected to the input shaft of the hydraulic walking drive pump through the intermediate transmission gear, the walking power output gear, and the walking power output pipe shaft. The clutch input end of the main working clutch is connected to the external spline of the main working power output pipe shaft through the clutch active friction plate, the clutch driven friction plate, and the internal spline of the clutch output end. The main working clutch is a wet friction plate clutch, which is placed in the main transmission housing. It is engaged and disengaged from the engine output power through the clutch operating device.

3. An integrated power take-off device for a combine harvester with a longitudinal axial flow threshing and separating drum as described in claim 1, characterized in that: The driving bevel gear of the bevel gear transmission mechanism is fixedly mounted to the main working power output pipe shaft, and is connected to the driving wheel of the threshing continuously variable transmission through the driven bevel gear, the threshing power output shaft, and the threshing continuously variable transmission.

4. An integrated power take-off device for a combine harvester with a longitudinal axial flow threshing and separating drum as described in claim 1, characterized in that: The external spline of the input end of the unloading power output shaft of the second belt pulley transmission mechanism is fixedly mounted to the internal spline of the transition connecting sleeve, and is connected to the internal spline of the clutch input end of the main working clutch through the external spline of the transition connecting sleeve; at the same time, the shaft head of the input end of the unloading power output shaft is inserted with the power input shaft through the positioning sleeve for shaft center positioning.

5. An integrated power take-off device for a combine harvester with a longitudinal axial flow threshing and separating drum as described in claim 1, characterized in that: The cylindrical gear transmission mechanism can be supplemented with a second power output gear to output the second path of power for the sub-transmission.

6. An integrated power take-off device for a combine harvester with a longitudinal axial flow threshing and separating drum as described in claim 1, characterized in that: The main drive housing and the sub-drive housing can also be manufactured as a single integrated housing.

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