Power reversing device

Abstract

The utility model relates to the technical field of power reversing, in particular to a power reversing device. Comprising a machine shell, a reversing shaft is rotationally installed in the machine shell, a first hub body with a left cavity and a right cavity is fixedly installed on the reversing shaft, a forward gear in transmission fit with a gearbox gear train is rotationally installed on the left side of the reversing shaft, and a reverse gear is rotationally installed on the right side of the reversing shaft; a friction mechanism capable of enabling the first hub body to be in power combination with the forward gear or the reverse gear is arranged in the driving cavity, a first piston is installed in the driving cavity in a sliding mode, and a first pressure cavity is formed between the first piston and the driving cavity; a reversing gear shaft is rotationally installed in the machine shell, a second reversing gear in transmission fit with the forward gear through an idle gear is fixedly installed at the left end of the reversing gear shaft, and a first reversing gear meshed with the reverse gear is fixedly installed at the right end of the reversing gear shaft. Therefore, when the device switches the forward gear or the backward gear, the operation is simpler, the machine does not need to be stopped to engage the gear, and the installation is more convenient through the arrangement of the oil path.

Description

Technical Field

[0001] This utility model relates to the field of power reversing technology, specifically to a power reversing device. Background Technology

[0002] In daily agricultural production, tractors are particularly important as the source of power for various agricultural implements, and the performance of tractors directly affects the working efficiency of various agricultural implements.

[0003] In the process of tractors driving agricultural implements for tilling and other tasks, switching between forward and reverse gears is a constant operation. In existing technology, tractors typically switch between forward and reverse gears by depressing the clutch pedal and controlling a shift lever. This process requires the tractor to be stationary, meaning the engine's power output is interrupted. In actual production, to meet production requirements, tractors often need to frequently switch between forward and reverse gears for tilling, sowing, and other tasks. Each gear shift requires stopping the tractor, making the gear-shifting process cumbersome and resulting in low agricultural production efficiency. Furthermore, using a mechanical shift lever requires significant installation space for the reversing device, necessitating advance planning and making installation quite troublesome. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a power reversing device to solve the issues of cumbersome tractor gear shifting processes leading to low agricultural production efficiency and the large installation space requirements of mechanical gear shift levers in the prior art.

[0005] This utility model is achieved using the following technical solution: a power reversing device, comprising a housing, wherein a reversing shaft rotatably mounted within the housing and driven by a power input shaft, characterized in that a first hub is fixedly mounted on the reversing shaft, forming two driving chambers, left and right, between the first hub and the reversing shaft; a forward gear, which engages with the gearbox gear system, is rotatably mounted on the left side of the reversing shaft, and a reverse gear is rotatably mounted on the right side of the first hub; both the forward and reverse gears are fixedly mounted with transmission sleeves, which are located within the driving chambers on their corresponding sides; the driving chambers are also provided with a friction mechanism that enables the first hub and transmission sleeves to engage through friction; a first piston for applying pressure to the friction mechanism is slidably mounted within the driving chambers; a first pressure chamber communicating with a hydraulic mechanism is provided between the first piston and the inner wall of the driving chambers; a reversing gear shaft is rotatably mounted within the housing, wherein a second reversing gear, which engages with the forward gear through an idler gear, is fixedly mounted on the left end of the reversing gear shaft, and a first reversing gear meshing with the reverse gear is fixedly mounted on the right end of the reversing gear shaft.

[0006] With the above structure, when the device needs to switch between forward and reverse power, it only requires controlling the hydraulic system to introduce oil into the first pressure chamber. Under the action of the hydraulic oil, the first piston squeezes the friction mechanism, causing the first hub to engage with the forward or reverse gear. When the first hub engages with the transmission sleeve of the forward gear, the power output shaft and the power input shaft rotate in the same direction. When the first hub engages with the transmission sleeve of the reverse gear, the reverse gear drives the forward gear to rotate in the opposite direction through the first reversing gear, the reversing gear shaft, the second reversing gear, and the idler gear, thereby driving the gear system in the gearbox to rotate in the opposite direction, thus causing the tractor to output power in the opposite direction. This makes the operation of switching forward or reverse gears simpler, without needing to stop the machine to engage the gear, and the oil circuit makes installation more convenient.

[0007] Preferably, a power output shaft is also rotatably mounted on the housing, and the power output shaft is in transmission engagement with the left end of the reversing shaft. Through the transmission engagement between the power output shaft and the reversing shaft, this device can transmit the power output from the tractor engine to the agricultural implements, making it more convenient for the implements to operate.

[0008] Preferably, the friction mechanism includes a plurality of first steel plates fixedly mounted on a first hub, and a plurality of first friction plates fixedly mounted on a transmission sleeve, the first friction plates being interlaced with the first steel plates; the first piston is located inside the innermost first steel plate and can abut against the first steel plate. Through the interlacing arrangement of the plurality of first friction plates and the plurality of first steel plates, this device can achieve power engagement between the first hub and the transmission sleeve through the frictional force between the first friction plates and the first steel plates.

[0009] Preferably, the first piston divides the drive chamber into a first pressure chamber and a first lubrication chamber. Two first baffles are fixedly installed on the reversing shaft, with the two first baffles located in the two first lubrication chambers on both sides of the first hub body. A first spring is provided between the first baffles and the first piston. By setting the first spring, the first piston can be reset under the action of the first spring after oil is no longer supplied to the first pressure chamber, thereby realizing the power cut-off between the first hub body and the transmission sleeve.

[0010] Preferably, the reversing shaft is provided with a reversing lubrication oil passage communicating with the hydraulic mechanism, and the reversing lubrication oil passage is connected to the two first lubrication chambers. The reversing lubrication oil passage allows the hydraulic system to supply lubricating oil to the first lubrication chambers, making it more convenient to use.

[0011] Preferably, a connecting shaft is fixedly connected to the left end of the reversing shaft, and a PTO input shaft is fixedly connected to the left end of the connecting shaft. The PTO input shaft is rotatably engaged with the housing. A hollow PTO gear shaft is rotatably sleeved on the PTO input shaft. A clutch mechanism for controlling the power engagement between the PTO gear shaft and the PTO input shaft is provided. The PTO gear shaft is engaged with a PTO output shaft via a gear set. The PTO output shaft is fixedly connected to the power output shaft and rotatably engaged with the housing. The PTO mechanism facilitates the transmission of power from the tractor engine to other agricultural implements, thereby driving the implements to work. When power transmission to the implements is not required, the clutch mechanism can disconnect the transmission, making operation more convenient.

[0012] Preferably, a second input gear and a first input gear are fixedly mounted on the left and right ends of the PTO gear shaft, respectively. A second output gear meshing with the second input gear and a first output gear meshing with the first input gear are rotatably mounted on the left and right ends of the PTO output shaft, respectively. A meshing sleeve is slidably mounted in the middle of the PTO output shaft. The meshing sleeve can engage with either the first or second output gear to drive the PTO output shaft to rotate. Through the engagement of the meshing sleeve with the two output gears, the power output shaft can output two different speeds when the engine output speed is the same. The appropriate speed can be selected according to the needs of the agricultural implement, thus enabling the device to meet the requirements of different agricultural implements and increasing its applicability.

[0013] Preferably, the clutch mechanism includes a synchronous pulley fixedly sleeved on the PTO input shaft, with a plurality of second friction plates fixedly mounted on the synchronous pulley. A second hub is also rotatably mounted on the PTO input shaft, with a plurality of second steel plates fixedly mounted on the second hub. The second steel plates are interlaced with the second friction plates, and a second piston is slidably mounted inside the second hub, capable of compressing the second steel plates to achieve dynamic engagement between the second steel plates and the second friction plates. Using the second piston to facilitate dynamic engagement between the second hub and the synchronous pulley reduces the mechanical drive structure, making its arrangement more convenient.

[0014] Preferably, the second piston divides the inner side of the second hub into a second pressure chamber and a second lubrication chamber, which are connected to the hydraulic system. A second baffle is fixedly installed on the second hub, and a second spring is provided between the second baffle and the second piston, with the second spring located within the second lubrication chamber. The second spring allows the second piston to be reset when the second hub and synchronous pulley are not required to engage power, thereby disconnecting the power between them.

[0015] Preferably, the hydraulic mechanism includes a fine filter with an oil inlet. The oil outlet of the fine filter is connected to a hydraulic valve block via an inlet pipe. The hydraulic valve block is connected to a second pressure chamber via a PTO pressure oil pipe, to a first pressure chamber on the left via a forward pressure oil pipe, to a first pressure chamber on the right via a reverse pressure oil pipe, to an oil tank via a main return oil pipe, and to a lubricating oil control valve block via a main lubrication oil pipe. The lubricating oil control valve block is connected to a second lubrication chamber via a PTO lubrication oil pipe, to a first lubrication chamber via a reversing lubrication oil pipe, and to an oil tank via a lubrication oil return oil pipe. An accumulator is connected to the inlet pipe via a tee. The hydraulic valve block and the lubricating oil control valve block allow for precise control of the hydraulic oil flow, thereby controlling the movement of the first and second pistons and enabling power coupling between various components. Furthermore, the arrangement of the hydraulic lines can freely circumvent the internal structure of the tractor, making installation more convenient compared to the arrangement of mechanical linkages. By using an accumulator, the pressure stability of the entire hydraulic system can be maintained, making the hydraulic system in this device safer and more reliable.

[0016] In summary, the beneficial effects of this utility model are as follows: the power reversing device of this utility model can switch between forward and reverse gears without stopping the tractor. During gear shifting, there is no need to operate the clutch pedal and shift lever to achieve gear switching; only the connection between the various oil circuits needs to be controlled by the hydraulic valve block. When forward movement is required, by controlling the connection between the inlet pipe and the forward pressure oil pipe, hydraulic oil enters the first pressure chamber on the left, thereby activating the friction mechanism on the left and directly driving the forward gear to rotate forward. When reverse movement is required, by controlling the connection between the inlet pipe and the reverse pressure oil pipe, hydraulic oil enters the first pressure chamber on the right, thereby activating the friction mechanism on the right. The reverse gear, through the first reversing gear, the second reversing gear, and the idler gear, drives the forward gear to rotate in reverse, thereby driving the gearbox gear system to rotate in the opposite direction. Therefore, this device is more efficient and easier to operate in agricultural production, and the gear shifting method without mechanical linkages also makes the device easier to install. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a power reversing device according to the present invention;

[0018] Figure 2 for Figure 1 A magnified view of a portion of area "A" in the image;

[0019] Figure 3 for Figure 1 A magnified view of a portion of region "B" in the middle;

[0020] Figure 4 This is a schematic diagram of the hydraulic system in a power reversing device.

[0021] In the diagram: 1-House; 2-Power input shaft; 3-Reversing shaft; 4-Reversing lubrication passage; 5-First reversing gear; 6-Reversing gear shaft; 7-Second reversing gear; 8-Connecting shaft; 9-PTO input shaft; 10-First input gear; 11-PTO gear shaft; 12-Second input gear; 13-PTO output shaft; 14-First output gear; 15-Meshing sleeve; 16-Second output gear; 17-Power output shaft; 18-Reverse gear; 19-Forward gear; 20-First hub; 21-First piston; 22-First steel plate; 24-First friction plate; 25-Transmission sleeve; 26-Mounting sleeve; 27-First pressure chamber; 29-First spring; 30-First lubrication... 31-First baffle; 32-Pressure oil passage; 33-PTO lubricating oil passage; 34-Second pressure chamber; 35-Second piston; 36-Second steel plate; 37-Second friction plate; 38-Second hub; 39-Synchronizing sleeve; 40-Synchronizing pulley; 41-Second lubrication chamber; 42-Second baffle; 43-Second spring; 44-Oil inlet; 45-Fine filter; 46-Oil inlet pipe; 47-Accumulator; 49-Hydraulic valve block; 50-Main return oil pipe; 51-Main lubricating oil pipe; 52-PTO pressure oil pipe; 53-Forward pressure oil pipe; 54-Reverse pressure oil pipe; 55-Lubricating oil control valve block; 56-Reversing lubricating oil pipe; 57-PTO lubricating oil pipe; 58-Lubricating oil return pipe. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0023] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0025] like Figure 1 , Figure 2As shown, this utility model provides a power reversing device, including a housing 1. A reversing shaft 3, rotatably mounted within the housing 1 and driven by a power input shaft 2, is mounted on the reversing shaft 3. A first hub 20 is fixedly mounted on the reversing shaft 3. Specifically, the first hub 20 is cylindrical and coaxially fixedly connected to the reversing shaft 3. The middle portion of the first hub 20 is fixedly connected to the reversing shaft 3 via a connecting plate extending towards the reversing shaft 3, which divides the first hub 20 into left and right drive chambers. A forward gear 19, which meshes with the gearbox gear system, is rotatably mounted on the left side of the reversing shaft 3, and a reverse gear 18 is rotatably mounted on the right side of the reversing shaft 3. A transmission sleeve 25 is fixedly installed at one end of the forward gear 19 and the reverse gear 18 near the first hub 20. The transmission sleeve 25 is located in the drive chamber on the corresponding side. A mounting sleeve 26 is also fixedly installed at the right end of the forward gear 19. The mounting sleeve 26 is rotatably connected to the housing 1 through a bearing, which makes the installation of the forward gear more stable. In addition, the mounting sleeve 26, the forward gear 19 and the transmission sleeve 25 on the left are integrally formed, and the reverse gear 18 and the transmission sleeve 25 on the right are also integrally formed. A friction mechanism is also provided in the drive chamber to enable the first hub 20 and the transmission sleeve 25 to be dynamically coupled through friction. A first piston 21 for applying pressure to the friction mechanism is slidably installed in the drive chamber. A first pressure chamber 27 communicating with the hydraulic mechanism is provided between the first piston 21 and the inner wall of the drive chamber.

[0026] A reversing gear shaft 6 is rotatably mounted inside the housing 1. A first reversing gear 5, meshing with a reverse gear 18, is fixedly connected to the right end of the reversing gear shaft 6. A second reversing gear 7 is fixedly connected to the left end of the reversing gear shaft 6. The second reversing gear 7 meshes with an idler gear, which is rotatably mounted inside the housing 1. The idler gear meshes with a forward gear 19. Therefore, the second reversing gear 7 and the forward gear 19 are connected via an idler gear. Adding an idler gear to enable the forward gear 19 and the second reversing gear 7 to engage is a common practice among those skilled in the art, and will not be elaborated upon here. Its main purpose is to ensure that the forward gear 19 and the second reversing gear 7 rotate in the same direction during transmission. This ensures that when the reversing shaft 3 is powered by the reverse gear 18, the rotation direction of the first reversing gear 5 is opposite to that of the reverse gear 18, thereby causing the forward gear 19 to rotate in the opposite direction to the reverse gear 18.

[0027] A power take-off shaft 17 is also rotatably mounted inside the housing 1. The power take-off shaft 17 is connected to the left end of the reversing shaft 3 via a PTO mechanism. The main purpose of the power take-off shaft 17 is to transmit the power output from the tractor engine to the agricultural implements. Furthermore, the PTO mechanism allows for easy disconnection of the transmission between the two components, making operation more convenient.

[0028] The aforementioned friction mechanism includes several first steel plates 22 fixedly mounted on the first hub 20, and several first friction plates 24 fixedly mounted on the transmission sleeve 25, with the first friction plates 24 intersecting with the first steel plates 22. The first piston 21 divides the drive chamber into a first pressure chamber 27 and a first lubrication chamber 30. Two first baffles 31 are fixedly mounted on the reversing shaft 3, and the two first baffles 31 are respectively located in the two first lubrication chambers 30 on both sides of the first hub 20. The first baffles 31 are located on the side of the first piston 21 away from its corresponding first pressure chamber 27. A first spring 29 is provided between the first baffles 31 and the first piston 21.

[0029] The first steel plate 22 is closest to the first piston 21. When power engagement is required, the first piston 21 presses against the nearest first steel plate 22, increasing the pressure between the first steel plate 22 and the first friction plate 24, thus enabling power transmission between them through friction. Furthermore, in the friction mechanism, the plate furthest from the corresponding first piston 21 is a thicker steel plate. This is primarily to prevent the first steel plate 22 and the first friction plate 24 from tilting in the direction of compression when pressed, ensuring a tight fit between them. When power engagement is not required, the first piston 21 returns to its original position under the action of the first spring 29, thus disconnecting the power transmission between the first steel plate 22 and the first friction plate 24.

[0030] The reversing shaft 3 is provided with a reversing lubricating oil passage 4 that communicates with the hydraulic mechanism. The reversing lubricating oil passage 4 is also connected to two first lubrication chambers 30. The reversing shaft 3 is also provided with two reversing pressure oil passages that communicate with the first pressure chambers 27 on the left and right sides respectively. The hydraulic mechanism can communicate with the first pressure chambers 27 on the left and right sides respectively through the two reversing pressure oil passages.

[0031] like Figure 1 , Figure 3 As shown, the PTO mechanism includes a PTO input shaft 9, which is connected to the reversing shaft 3 via a connecting shaft 8. Specifically, the left end of the connecting shaft 8 is coaxially and fixedly connected to the PTO input shaft 9, and the right end of the connecting shaft 8 passes through the middle of the mounting sleeve 26 and is coaxially and fixedly connected to the left end of the reversing shaft 3. The PTO input shaft 9 is rotatably connected to the housing 1. A hollow PTO gear shaft 11 is rotatably sleeved on the PTO input shaft 9. A clutch mechanism for controlling the power engagement between the PTO gear shaft 11 and the PTO input shaft 9 is provided. The PTO gear shaft 11 is connected to the PTO output shaft 13 via a gear set. The PTO output shaft 13 is fixedly connected to the power output shaft 17 and is rotatably connected to the housing 1.

[0032] The left and right ends of the PTO gear shaft 11 are respectively fixedly mounted with a second input gear 12 and a first input gear 10. The left and right ends of the PTO output shaft 13 are respectively rotatably mounted with a second output gear 16 that meshes with the second input gear 12 and a first output gear 14 that meshes with the first input gear 10. A meshing sleeve 15 is slidably mounted in the middle of the PTO output shaft 13. The meshing sleeve 15 can be powered to engage with the first output gear 14 or the second output gear 16 and drive the PTO output shaft 13 to rotate.

[0033] In this configuration, the first input gear 10 and the first output gear 14, as well as the second input gear 12 and the second output gear 16, are in a constant meshing state. The meshing sleeve 15 in the middle can also be a synchronizer, which selects the first output gear 14 or the second output gear 16 to engage with its power by moving the shift fork, thereby outputting different speeds to meet the power requirements of the agricultural machinery.

[0034] The clutch mechanism includes a synchronous pulley 40 fixedly sleeved on the PTO input shaft 9, a plurality of second friction plates 37 fixedly mounted on the synchronous pulley 40, a second hub 38 rotatably mounted on the PTO input shaft 9, a plurality of second steel plates 36 fixedly mounted on the second hub 38, the second steel plates 36 and the second friction plates 37 being interlaced, and a second piston 35 slidably mounted inside the second hub 38, capable of squeezing the second steel plates 36 so that the second steel plates 36 and the second friction plates 37 are dynamically engaged.

[0035] The right end of the second hub 38 is fixedly connected to a synchronizing sleeve 39. The inner side of the synchronizing sleeve 39 is connected to the PTO gear shaft 11 via a spline, meaning that the PTO gear shaft 11 can rotate with the synchronizing sleeve 39.

[0036] The second piston 35 divides the inner side of the second hub 38 into a second pressure chamber 34 and a second lubrication chamber 41 that are connected to the hydraulic system. A second baffle 42 is fixedly installed on the second hub 38. A second spring 43 is provided between the second baffle 42 and the second piston 35. The second spring 43 is located in the second lubrication chamber 41.

[0037] The PTO input shaft 9 is also provided with a pressure oil passage 32 that communicates with the second pressure chamber 34 and a PTO lubrication oil passage 33 that communicates with the second lubrication chamber 41. Both the pressure oil passage 32 and the PTO lubrication oil passage 33 are connected to the hydraulic mechanism.

[0038] like Figure 1 , Figure 4As shown, the hydraulic mechanism includes a fine filter 45 fixedly mounted on the tractor frame. The fine filter 45 has an oil inlet 44. The oil outlet of the fine filter 45 is connected to a hydraulic valve block 49 through an oil inlet pipe 46. The hydraulic valve block 49 is connected to the second pressure chamber 34 through a PTO pressure oil pipe 52, to the first pressure chamber 27 on the left through a forward pressure oil pipe 53, to the first pressure chamber 27 on the right through a backward pressure oil pipe 54, to the oil tank through a main return oil pipe 50, and to a lubricating oil control valve block 55 through a main lubricating oil pipe 51. The lubricating oil control valve block 55 is connected to the second lubrication chamber 41 through a PTO lubrication oil pipe 57, to the first lubrication chamber 30 through a reversing lubrication oil pipe 56, and to the oil tank through a lubricating oil return oil pipe 58.

[0039] Oil in the tractor's fuel tank flows into the hydraulic mechanism of this device through the oil inlet 44 of the fine filter 45. After being filtered by the fine filter 45, the oil is distributed as needed to the first pressure chamber 27 on the left and right sides and the second pressure chamber 34 in the PTO mechanism through the hydraulic valve block 49. The lubricating oil is also distributed as needed to the first lubrication chamber 30 and the second lubrication chamber 41 through the lubricating oil control valve block 55.

[0040] When it is necessary to control the first piston 21 to press against the first steel plate 22 or the second piston 35 to press against the second steel plate 36, the hydraulic valve block 49 will connect its corresponding pressure oil pipe to the oil inlet pipe 46. Conversely, when the first piston 21 or the second piston 35 needs to move away from its corresponding steel plate (i.e., to return to its original position), the hydraulic valve block 49 will connect its corresponding pressure oil pipe to the main return oil pipe 50. The movement of the lubricating oil control valve block 55 is similar, both used to control the connection and disconnection between the oil pipes, and will not be described further.

[0041] The hydraulic pressure in the pressure chamber is controlled by controlling the hydraulic valve block 49, thereby controlling the connection or disconnection between various components. The hydraulic valve block 49 controls the connection and disconnection between various oil pipes by controlling the movement of the valve stem inside the hydraulic valve block 49 through a solenoid valve or motor. There is no need for a mechanical shifting mechanism, making operation simpler, reducing the error rate of shifting gears, and making installation more convenient.

[0042] As a further illustration of this example, in order to keep the oil pressure in the hydraulic mechanism of this device stable, an accumulator 47 is connected to the oil inlet pipe 46 via a tee.

[0043] The operating principle of this device is as follows: Taking the forward switching to reverse in this device as an example, when it is necessary to switch to the reverse position, the hydraulic valve block 49 is controlled to connect the oil inlet pipe 46 with the reverse pressure oil pipe 54 and the forward pressure oil pipe 53 with the main return oil pipe 50, so that the pressure oil flows into the first pressure chamber 27 on the right side, and the first spring 29 on the left side pushes the first piston 21 on the left side to return to its position, and the oil in the first pressure chamber 27 on the left side flows back to the oil tank along the main return oil pipe 50. After the hydraulic oil flows into the first pressure chamber 27 on the right, the first piston 21 on the right moves to the right to squeeze the friction mechanism, so that the reversing shaft 3 can drive the reverse gear 18 to rotate. The reverse gear 18 drives the reversing gear shaft 6 to rotate in the opposite direction to the reversing shaft 3 through the first reversing gear 5, and then drives the second reversing gear 7 to rotate in the opposite direction. The second reversing gear 7 drives the forward gear 19 to rotate in the same direction as the second reversing gear 7 through the idler wheel. That is, the rotation direction of the forward gear 19 is opposite to the rotation direction of the reversing shaft 3, which causes the gear system of the gearbox to rotate in the opposite direction, so that the output shaft of the gearbox outputs in the opposite direction, driving the tractor to move in the opposite direction. When the clutch mechanism requires power and needs to be engaged, the hydraulic valve block 49 is controlled to connect the oil inlet pipe 46 with the PTO pressure oil pipe 52. The second piston 35 will squeeze the second steel plate 36 under the action of oil pressure, so that the synchronous sleeve 39 and the synchronous wheel 40 are engaged. This causes the PTO input shaft 9 to drive the PTO gear shaft 11 to rotate. At this time, the shift fork moves the meshing sleeve 15 to rotate with the PTO gear shaft 11, which in turn drives the PTO output shaft 13 and the power output shaft 17 to rotate. This allows the power transmitted from the tractor engine power input shaft 2 to be transmitted to the agricultural implements through the power output shaft 17 for operation.

[0044] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A power reversing device comprising a housing (1) in which a reversing shaft (3) is rotatably mounted and can be driven by a power input shaft (2), characterized in that, The reversing shaft (3) is fixedly installed with a first hub (20), and the first hub (20) and the reversing shaft (3) form two driving chambers on the left and right sides. The reversing shaft (3) is rotatably installed with a forward gear (19) on the left side of the first hub (20) and a reverse gear (18) on the right side of the first hub (20), and the forward gear (19) and the reverse gear (18) are fixedly installed with a transmission sleeve (25). The transmission sleeve (25) is located in the driving chamber on the corresponding side. The driving chamber is also provided with a friction mechanism capable of power combination of the first hub (20) and the transmission sleeve (25) through friction. The driving chamber is slidably installed with a first piston (21) for applying pressure to the friction mechanism. The first piston (21) and the inner wall of the driving chamber are provided with a first pressure chamber (27) in communication with the hydraulic mechanism. The machine shell (1) is rotatably installed with a reversing gear shaft (6). The left end of the reversing gear shaft (6) is fixedly installed with a second reversing gear (7) in transmission cooperation with the forward gear (19) through an idler gear. The right end of the reversing gear shaft (6) is fixedly installed with a first reversing gear (5) engaged with the reverse gear (18).

2. A power commutating device according to claim 1, characterised in that, The machine shell (1) is also rotatably installed with a power output shaft (17) in transmission cooperation with the left end of the reversing shaft (3).

3. The power commutating device of claim 1, wherein, The friction mechanism includes a plurality of first steel plates (22) fixedly installed on the first hub (20). The transmission sleeve (25) is fixedly installed with a plurality of first friction plates (24). The first friction plates (24) and the first steel plates (22) are arranged in a penetrating manner. The first piston (21) is located on the inner side of the innermost first steel plate (22) and can abut against the first steel plate (22).

4. The power commutating device of claim 2, wherein, The first piston (21) divides the driving chamber into a first pressure chamber (27) and a first lubricating chamber (30). The reversing shaft (3) is fixedly installed with two first baffles (31). The two first baffles (31) are located in the two first lubricating chambers (30) on the left and right sides of the first hub (20). The first baffle (31) and the first piston (21) are provided with a first spring (29).

5. A power commutating device according to claim 4, characterised in that, The reversing shaft (3) is provided with a reversing lubricating oil channel (4) in communication with the hydraulic mechanism. The reversing lubricating oil channel (4) is in communication with the two first lubricating chambers (30).

6. A power commutating device according to claim 5, characterised in that, The left end of the reversing shaft (3) is fixedly connected with a connecting shaft (8). The left end of the connecting shaft (8) is fixedly connected with a PTO input shaft (9). The PTO input shaft (9) is in transmission cooperation with the machine shell (1). The PTO input shaft (9) is rotatably sleeved with a hollow PTO gear shaft (11). The PTO gear shaft (11) and the PTO input shaft (9) are provided with a clutch mechanism for controlling the power combination therebetween. The PTO gear shaft (11) is in transmission cooperation with a PTO output shaft (13) through a gear set. The PTO output shaft (13) is fixedly connected with the power output shaft (17). The PTO output shaft (13) is in transmission cooperation with the machine shell (1).

7. A power commutating device according to claim 6, characterised in that, The left and right ends of the PTO gear shaft (11) are respectively fixedly installed with a second input gear (12) and a first input gear (10), the left and right ends of a PTO output shaft (13) are respectively rotatably installed with a second output gear (16) engaged with the second input gear (12) and a first output gear (14) engaged with the first input gear (10), and the middle part of the PTO output shaft (13) is slidably installed with an engaging sleeve (15) which can be power combined with the first output gear (14) or the second output gear (16) and drive the PTO output shaft (13) to rotate.

8. The power commutating device of claim 6, wherein, The clutch mechanism comprises a synchronizer (40) sleeved on the PTO input shaft (9), a plurality of second friction plates (37) fixedly installed on the synchronizer (40), a second hub body (38) rotatably installed on the PTO input shaft (9), a plurality of second steel plates (36) fixedly installed on the second hub body (38), the second steel plates (36) and the second friction plates (37) being arranged in a penetrating manner, and a second piston (35) slidably installed in the second hub body (38) and capable of pressing the second steel plates (36) to power combine the second steel plates (36) with the second friction plates (37).

9. A power commutating device according to claim 8, characterised in that, The second piston (35) divides the inner side of the second hub body (38) into a second pressure cavity (34) and a second lubricating cavity (41) which are in communication with the hydraulic system, the second hub body (38) is fixedly installed with a second baffle (42), a second spring (43) is arranged between the second baffle (42) and the second piston (35), and the second spring (43) is located in the second lubricating cavity (41).

10. A power commutating device according to claim 9, characterised in that, The hydraulic mechanism comprises a fine filter (45), the fine filter (45) is provided with an oil inlet (44), an oil outlet of the fine filter (45) is communicated with a hydraulic valve block (49) through an oil inlet pipe (46), the hydraulic valve block (49) is communicated with the second pressure cavity (34) through a PTO pressure oil pipe (52), communicated with the left first pressure cavity (27) through an advancing pressure oil pipe (53), communicated with the right first pressure cavity (27) through a retreating pressure oil pipe (54), communicated with an oil tank through a main oil return pipe (50), communicated with a lubricating oil control valve block (55) through a main lubricating oil pipe (51), communicated with the second lubricating cavity (41) through a PTO lubricating oil pipe (57), communicated with the first lubricating cavity (30) through a reversing lubricating oil pipe (56), and communicated with the oil tank through a lubricating oil return pipe (58); and the oil inlet pipe (46) is connected with an accumulator (47) through a three-way pipe.

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