Power reversing device

Abstract

The invention 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] The present invention relates to the technical field of power reversing, and particularly relates to a power reversing device. Background Art

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

[0003] During the process of a tractor driving agricultural implements for farming and other work, the switching between forward and reverse gears runs through the whole process. In the prior art, the switching between forward and reverse gears of a tractor is often achieved by stepping on the clutch pedal and then controlling the shift lever. In this process, it is required that the tractor be in a stationary state first, that is, the output power of the tractor engine is interrupted. In the actual production process, in order to meet the production requirements, tractors often need to frequently switch between forward and reverse gears to perform operations such as plowing and sowing. However, each gear shift requires the tractor to stop, making the gear shift process of the tractor relatively cumbersome and resulting in low agricultural production efficiency. In addition, controlled by a mechanical shift lever, the installation space requirement for the reversing device is relatively large, and it is more troublesome to layout in advance during installation. Summary of the Invention

[0004] In view of the above problems, the present invention provides a power reversing device to solve the problems in the prior art that the gear shift process of a tractor is relatively cumbersome, resulting in low agricultural production efficiency, and the mechanical shift lever has a relatively large installation space requirement.

[0005] The present invention is implemented by the following technical solutions: A power reversing device includes a housing. A reversing shaft that can be driven by a power input shaft is rotatably installed in the housing. It is characterized in that a first hub is fixedly installed on the reversing shaft. Two driving chambers are formed between the first hub and the reversing shaft on the left and right. A forward gear that is in transmission cooperation with the gear train of the gearbox is rotatably installed on the left side of the first hub of the reversing shaft, and a reverse gear is rotatably installed on the right side of the first hub. Transmission sleeves are fixedly installed on both the forward gear and the reverse gear. The transmission sleeve is located in the driving chamber on its corresponding side. The driving chamber is also provided with a friction mechanism that can make the first hub and the transmission sleeve be power-combined through friction. A first piston for applying pressure to the friction mechanism is slidably installed in the driving chamber. A first pressure chamber communicating with a hydraulic mechanism is provided between the first piston and the inner wall of the driving chamber. A reversing gear shaft is rotatably installed in the housing. A second reversing gear that is in transmission cooperation with the forward gear through an idler gear is fixedly installed at the left end of the reversing gear shaft, and a first reversing gear that meshes with the reverse gear is fixedly installed at the right end. A power output shaft is also rotatably installed on the housing, and the power output shaft is in transmission cooperation with the left end of the reversing shaft.

[0006] With the above structure, when the device needs to switch the power for forward and reverse movement, it only needs to control the hydraulic system to introduce hydraulic 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 be power-connected to the forward gear or the reverse gear. When the first hub is power-connected to the transmission sleeve of the forward gear, the rotation directions of the power output shaft and the power input shaft are the same. When the first hub is power-connected to the transmission sleeve of the reverse gear, the reverse gear drives the forward gear to rotate in the reverse direction through the first reversing gear, the reversing gear shaft, the second reversing gear, and the idler gear, thereby driving the gear train in the gearbox to rotate in the reverse direction, and further enabling the tractor to output power in the reverse direction. This makes the operation of switching the forward or reverse gear of the device simpler, without the need to stop the machine to shift gears, and the installation is more convenient through the arrangement of the oil circuit. In addition, through the transmission cooperation between the power output shaft and the reversing shaft, the device can also transmit the power output by the tractor engine to the agricultural implement, making it more convenient for the implement to work.

[0007] Preferably, the friction mechanism includes a plurality of first steel plates fixedly installed on the first hub, and a plurality of first friction plates fixedly installed on the transmission sleeve. The first friction plates and the first steel plates are arranged in an interlaced manner; the first piston is located inside the innermost first steel plate and can abut against the first steel plate. Through the arrangement of the plurality of first friction plates and the plurality of first steel plates in an interlaced manner, the device can make the first hub and the transmission sleeve be power-connected through the frictional force between the first friction plates and the first steel plates.

[0008] 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, and the two first baffles are respectively located in the two first lubrication chambers on both sides of the first hub. A first spring is provided between the first baffle and the first piston. Through the setting of the first spring, after the oil supply to the first pressure chamber is stopped, the first piston can be reset under the action of the first spring, thereby realizing the power cut-off between the first hub and the transmission sleeve.

[0009] Preferably, a reversing lubricating oil passage communicating with the hydraulic mechanism is provided on the reversing shaft, and the reversing lubricating oil passage communicates with the two first lubrication chambers. Through the setting of the reversing lubricating oil passage, the hydraulic system can introduce lubricating oil into the first lubrication chamber through the reversing lubricating oil passage, making it more convenient to use.

[0010] Preferably, a connecting shaft is fixedly connected to the left end of the reversing shaft, a PTO input shaft is fixedly connected to the left end of the connecting shaft, the PTO input shaft is rotationally fitted with the machine housing, a hollow PTO gear shaft is rotatably sleeved on the PTO input shaft, a clutch mechanism for controlling the power combination between the two is provided between the PTO gear shaft and the PTO input shaft, the PTO gear shaft is drivingly fitted with a PTO output shaft through a gear set, the PTO output shaft is fixedly connected to the power output shaft, and the PTO output shaft is rotationally fitted with the machine housing. Through the arrangement of the PTO mechanism, it is more convenient to transmit the power output by the tractor engine to other agricultural implements, so as to drive the agricultural implements to work. When it is not necessary to transmit power to the agricultural implements, the transmission between the two can also be disconnected through the clutch mechanism, making the operation more convenient.

[0011] Preferably, a second input gear and a first input gear are respectively fixedly installed at the left and right ends of the PTO gear shaft, a second output gear meshing with the second input gear and a first output gear meshing with the first input gear are respectively rotatably installed at the left and right ends of the PTO output shaft, a sliding sleeve is slidably installed in the middle of the PTO output shaft, and the sliding sleeve can be power-combined with the first output gear or the second output gear to drive the PTO output shaft to rotate. Through the cooperation of the sliding sleeve and the two output gears, when the engine outputs the same speed, the power output shaft can output two speeds, and the appropriate speed can be selected according to the needs of the agricultural implements, so that the device meets the requirements of different agricultural implements and increases the applicability of the device.

[0012] Preferably, the clutch mechanism includes a synchronous wheel fixedly sleeved on the PTO input shaft, a plurality of second friction plates are fixedly installed on the synchronous wheel, a second hub is also rotatably installed on the PTO input shaft, a plurality of second steel plates are fixedly installed on the second hub, the second steel plates and the second friction plates are arranged in an interlaced manner, and a second piston capable of extruding the second steel plates to make the second steel plates and the second friction plates power-combined is slidably installed in the second hub. The second piston is used to promote the power combination between the second hub and the synchronous wheel, reducing the mechanical drive structure and making it more convenient to arrange.

[0013] Preferably, the second piston divides the inner side of the second hub into a second pressure chamber communicated with the hydraulic system and a second lubricating chamber, a second baffle is fixedly installed on the second hub, a second spring is provided between the second baffle and the second piston, and the second spring is located in the second lubricating chamber. Through the setting of the second spring, when it is not necessary to power-combine the second hub and the synchronous wheel, the second spring can drive the second piston to reset, thereby realizing the power cut-off between the two.

[0014] Preferably, the hydraulic mechanism includes a fine filter. An oil inlet is provided on the fine filter. The oil outlet of the fine filter is connected to a hydraulic valve block through an oil inlet pipe. The hydraulic valve block is connected to the second pressure chamber through a PTO pressure oil pipe, to the first pressure chamber on the left through a forward pressure oil pipe, to the first pressure chamber on the right through a reverse pressure oil pipe, to the fuel tank through a main return oil pipe, and is connected to a lubricating oil control valve block through a main lubricating oil pipe. The lubricating oil control valve block is connected to the second lubricating chamber through a PTO lubricating oil pipe, to the first lubricating chamber through a reversing lubricating oil pipe, and to the fuel tank through a lubricating oil return pipe. Through the settings of the hydraulic valve block and the lubricating oil control valve block, the flow direction of the hydraulic oil can be accurately controlled, thereby controlling the movement of the first piston and the second piston and achieving the power combination between components. In addition, the layout of the hydraulic pipeline can freely avoid the internal structure of the tractor, which is more convenient to install compared with the layout of mechanical connecting rods.

[0015] Preferably, an accumulator is connected to the oil inlet pipe through a tee. Through the setting of the accumulator, the stability of the pressure in 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 the present invention are as follows: The power reversing device in the present invention can switch between forward and reverse gears without stopping the tractor. When shifting gears, it is not necessary to operate the clutch pedal and the shift lever to achieve gear shifting. It only needs to control the connection between the oil circuits through the hydraulic valve block. When forward movement is required, by controlling the connection between the oil inlet pipe and the forward pressure oil pipe, the hydraulic oil will enter the first pressure chamber on the left, causing the friction mechanism on the left to act and directly driving the forward gear to rotate forward. When reverse movement is required, by controlling the connection between the oil inlet pipe and the reverse pressure oil pipe, the hydraulic oil will enter the first pressure chamber on the right, causing the friction mechanism on the right to act. The reverse gear drives the forward gear to reverse through the first reversing gear, the second reversing gear, and the idler gear, thereby driving the gear train of the transmission to rotate in reverse. Therefore, this device has higher efficiency and more convenient operation in agricultural production. The gear shifting method without mechanical connecting rods also makes this device more convenient to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structural schematic diagram of a power reversing device of the present invention; Figure 2 is Figure 1 the partial enlarged view of the "A" area in Figure 3 is Figure 1 the partial enlarged view of the "B" area in Figure 4 is the structural schematic diagram of the hydraulic system in the power reversing device.

[0018] In the figure: 1 - housing; 2 - power input shaft; 3 - reversing shaft; 4 - reversing lubricating oil 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 - engaging 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 lubricating chamber; 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 wheel; 41 - second lubricating 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 oil return 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. Specific embodiments

[0019] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0020] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0021] The following is a description of the preferred embodiments of the present invention in conjunction with the drawings.

[0022] As Figure 1 、 Figure 2As shown, the present invention provides a power reversing device, including a housing 1, in which a reversing shaft 3 driven by a power input shaft 2 is rotatably mounted, and a first hub body 20 is fixedly mounted on the reversing shaft 3. Specifically, the first hub body 20 is cylindrical and coaxially fixedly connected to the reversing shaft 3. The middle portion of the first hub body 20 is fixedly connected to the reversing shaft 3 via a connecting plate extending toward the reversing shaft 3, and the connecting plate divides the first hub body 20 into two left and right drive chambers. A forward gear 19 that cooperates with the transmission gear train is rotatably mounted on the reversing shaft 3 at a position on the left side of the first hub body 20, and a reverse gear 18 is rotatably mounted on the reversing shaft 3 at a position on the right side of the first hub body 20. A transmission sleeve 25 is fixedly mounted on one end of the forward gear 19 and the reverse gear 18 near the first hub body 20. The transmission sleeve 25 is located in the drive chamber on the corresponding side. A mounting sleeve 26 is also fixedly mounted on the right end of the forward gear 19. The mounting sleeve 26 is rotatably connected to the housing 1 through a bearing, thereby making the forward gear installation 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 that can dynamically couple the first hub body 20 and the transmission sleeve 25 through friction. A first piston 21 for applying pressure to the friction mechanism is slidably mounted in the drive chamber. A first pressure chamber 27 connected to the hydraulic mechanism is provided between the first piston 21 and the inner wall of the drive chamber.

[0023] A reversing gear shaft 6 is also rotatably mounted in the housing 1. The right end of the reversing gear shaft 6 is fixedly connected to a first reversing gear 5 meshing with the reverse gear 18. The left end of the reversing gear shaft 6 is fixedly connected to a second reversing gear 7. The second reversing gear 7 is meshed with an idler gear. The idler gear is rotatably mounted in the housing 1 and meshes with the forward gear 19. That is, the second reversing gear 7 and the forward gear 19 are connected in transmission via an idler gear. The method of adding an idler gear to achieve transmission coordination between the forward gear 19 and the second reversing gear 7 is a common method used by those skilled in the art and will not be elaborated on here. The main purpose is to ensure that the forward gear 19 and the second reversing gear 7 rotate in the same direction during transmission, so 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 driving the forward gear 19 to rotate in the opposite direction to that of the reverse gear 18.

[0024] A power take-off (PTO) shaft 17 is rotatably mounted within the housing 1 and engages with the left end of the reversing shaft 3 via a PTO mechanism. The PTO shaft 17 is primarily used to transfer power from the tractor engine to the agricultural implement. The PTO mechanism allows for disconnection of the transmission between the two at any time, making operation more convenient.

[0025] The friction mechanism described above includes a number of first steel plates 22 fixedly installed on the first hub 20. A number of first friction plates 24 are fixedly installed on the transmission sleeve 25, and the first friction plates 24 and the first steel plates 22 are arranged in an interlaced manner. 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 installed 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, and the first baffle 31 is 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 baffle 31 and the first piston 21.

[0026] The first steel plate 22 closest to the first piston 21 is one of them. When power combination is required, the first piston 21 presses the first steel plate 22 closest to it, increasing the pressure between the first steel plate 22 and the first friction plate 24, so that power transmission can be achieved between the first steel plate 22 and the first friction plate 24 through friction. In addition, in the friction mechanism, the steel plate farthest from its corresponding first piston 21 is a thicker one, which is mainly to prevent the first steel plate 22 and the first friction plate 24 from tilting in the direction of extrusion when being pressed, thus ensuring the close fit between the first steel plate 22 and the first friction plate 24. When power combination is not required, the first piston 21 will return to its original position under the action of the first spring 29, and the power transmission between the first steel plate 22 and the first friction plate 24 is thus disconnected.

[0027] A reversing lubricating oil passage 4 communicating with the hydraulic mechanism is provided on the reversing shaft 3, and the reversing lubricating oil passage 4 communicates with the two first lubrication chambers 30. Two reversing pressure oil passages are also provided on the reversing shaft 3, and the two reversing pressure oil passages 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.

[0028] As Figure 1 、 Figure 3 shown, the PTO mechanism includes a PTO input shaft 9, and the PTO input shaft 9 is in transmission cooperation with the reversing shaft 3 through a connecting shaft 8; specifically, the left end of the connecting shaft 8 is coaxially and fixedly connected to the PTO input shaft 9, 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, and the PTO input shaft 9 is rotationally matched with the machine housing 1. A hollow PTO gear shaft 11 is rotatably sleeved on the PTO input shaft 9, and a clutch mechanism for controlling the power combination between the two is provided between the PTO gear shaft 11 and the PTO input shaft 9. 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 to the power output shaft 17, and the PTO output shaft 13 is rotationally matched with the machine housing 1.

[0029] On the left and right ends of the PTO gear shaft 11, a second input gear 12 and a first input gear 10 are respectively and fixedly installed. On the left and right ends of the PTO output shaft 13, a second output gear 16 meshing with the second input gear 12 and a first output gear 14 meshing with the first input gear 10 are respectively rotatably installed. In the middle of the PTO output shaft 13, a sliding sleeve 15 is installed. The sliding sleeve 15 can be power-connected with the first output gear 14 or the second output gear 16 to drive the PTO output shaft 13 to rotate.

[0030] Among them, the first input gear 10 and the first output gear 14, and the second input gear 12 and the second output gear 16 are in a constantly meshing state. The sliding sleeve 15 in the middle can also adopt a synchronizer, which is toggled by a shift fork to select the first output gear 14 or the second output gear 16 to be power-connected with it, so as to output different speeds to meet the power requirements of agricultural implements.

[0031] The clutch mechanism includes a synchronizing wheel 40 fixedly sleeved on the PTO input shaft 9. A number of second friction plates 37 are fixedly installed on the synchronizing wheel 40. A second hub 38 is also rotatably installed on the PTO input shaft 9. A number of second steel plates 36 are fixedly installed on the second hub 38. The second steel plates 36 and the second friction plates 37 are arranged in an interlaced manner. A second piston 35 capable of extruding the second steel plates 36 to make the second steel plates 36 and the second friction plates 37 power-connected is slidably installed in the second hub 38.

[0032] Among them, the right end of the second hub 38 is fixedly connected with a synchronizing sleeve 39. The inner side of the synchronizing sleeve 39 is in transmission cooperation with the PTO gear shaft 11 through splines, that is, the PTO gear shaft 11 can rotate following the synchronizing sleeve 39.

[0033] The second piston 35 divides the inner side of the second hub 38 into a second pressure chamber 34 communicated with the hydraulic system and a second lubrication chamber 41. A second baffle 42 is fixedly installed on the second hub 38. A second spring 43 is arranged between the second baffle 42 and the second piston 35. The second spring 43 is located in the second lubrication chamber 41.

[0034] On the PTO input shaft 9, there is also a pressure oil passage 32 communicated with the second pressure chamber 34 and a PTO lubricating oil passage 33 communicated with the second lubrication chamber 41. Both the pressure oil passage 32 and the PTO lubricating oil passage 33 are communicated with the hydraulic mechanism.

[0035] Such as Figure 1 、 Figure 4As shown in the figure, the hydraulic mechanism includes a fine filter 45 fixedly installed on the tractor frame. An oil inlet 44 is provided on the fine filter 45. 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, connected to the first pressure chamber 27 on the left through a forward pressure oil pipe 53, connected to the first pressure chamber 27 on the right through a reverse pressure oil pipe 54, connected to the fuel tank through a main return oil pipe 50, and connected 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 lubricating chamber 41 through a PTO lubricating oil pipe 57, connected to the first lubricating chamber 30 through a reversing lubricating oil pipe 56, and connected to the fuel tank through a lubricating oil return pipe 58.

[0036] The oil in the tractor fuel tank flows into the hydraulic mechanism in this device through the oil inlet 44 of the fine filter 45. After being filtered by the fine filter 45, the hydraulic valve block 49 distributes the oil to the first pressure chambers 27 on the left and right sides and the second pressure chamber 34 in the PTO mechanism as required, and the lubricating oil control valve block 55 distributes the lubricating oil to the first lubricating chamber 30 and the second lubricating chamber 41 as required.

[0037] When it is necessary to control the first piston 21 on one side to squeeze the first steel plate 22 or control the second piston 35 to squeeze the second steel plate 36, the hydraulic valve block 49 will control its corresponding pressure oil pipe to be connected to the oil inlet pipe 46. When the first piston 21 or the second piston 35 needs to move away from its corresponding steel plate, that is, when it needs to return to its original position, the hydraulic valve block 49 will control the corresponding pressure oil pipe to be connected to the main return oil pipe 50. The operation of the lubricating oil control valve block 55 is similar, all of which are used to control the on-off between each oil pipe, so it will not be elaborated here.

[0038] By controlling the hydraulic valve block 49 to control the oil pressure in the pressure chamber, thereby controlling the connection or disconnection between each component, and the on-off between each oil pipe of the hydraulic valve block 49 can be realized by controlling the movement of the valve rod in the hydraulic valve block 49 through an electromagnetic valve or a motor. There is no need for a mechanical shifting mechanism, the operation is more convenient, the error rate of gear shifting is lower, and the installation is also more convenient.

[0039] As a further explanation of this example, in order to keep the oil pressure in the hydraulic mechanism of this device stable, an accumulator 47 is connected through a tee at the oil inlet pipe 46.

[0040] The working principle of this device is as follows: Taking the forward-to-backward switching in this device as an example, when it is necessary to switch to the reverse gear, by controlling the hydraulic valve block 49, the inlet oil pipe 46 is connected to the reverse pressure oil pipe 54, and the forward pressure oil pipe 53 is connected to the main return oil pipe 50, so that the pressure oil flows into the first pressure chamber 27 on the right side. The first spring 29 on the left side pushes the first piston 21 on the left side to return to its original position, and the oil in the first pressure chamber 27 on the left side flows back to the fuel tank along the main return oil pipe 50. After the hydraulic oil flows into the first pressure chamber 27 on the right side, the first piston 21 on the right side 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 reverse direction. The second reversing gear 7 drives the forward gear 19 to rotate in the reverse direction, which is the same as that of the second reversing gear 7, that is, the rotation direction of the forward gear 19 is opposite to that of the reversing shaft 3, and then the gear train of the gearbox rotates in the reverse direction, so that the output shaft of the gearbox outputs in the reverse direction, driving the tractor to move in the reverse direction. When the clutch mechanism needs to combine power, by controlling the hydraulic valve block 49, the inlet oil pipe 46 is connected to 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 synchronizing sleeve 39 is combined with the synchronizing wheel 40 in terms of power. Then the PTO input shaft 9 drives the PTO gear shaft 11 to rotate. At this time, the engaging sleeve 15 is moved by the shift fork to rotate along with the PTO gear shaft 11, and then drives the PTO output shaft 13 and the power output shaft 17 to rotate, so as to realize the transmission of the power transmitted by the power input shaft 2 of the tractor engine to the agricultural implement through the power output shaft 17 for work.

[0041] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A power reversing device, comprising a housing (1), wherein a reversing shaft (3) that can be driven by a power input shaft (2) is rotatably installed in the housing (1), and is characterized in that, A first hub body (20) is fixedly installed on the reversing shaft (3). Two driving chambers are formed between the first hub body (20) and the reversing shaft (3). A forward gear (19) that is in transmission cooperation with the gear train of the gearbox is rotatably installed on the left side of the first hub body (20) of the reversing shaft (3), and a reverse gear (18) is rotatably installed on the right side of the first hub body (20). Transmission sleeves (25) are fixedly installed on both the forward gear (19) and the reverse gear (18). The transmission sleeves (25) are located in the driving chambers on their corresponding sides. The driving chambers are also provided with a friction mechanism that can make the first hub body (20) and the transmission sleeves (25) be power-combined through friction. A first piston (21) for applying pressure to the friction mechanism is slidably installed in the driving chamber. A first pressure chamber (27) that is communicated with a hydraulic mechanism is provided between the first piston (21) and the inner wall of the driving chamber; A reversing gear shaft (6) is rotatably installed in the housing (1). A second reversing gear (7) that is in transmission cooperation with the forward gear (19) through an idler gear is fixedly installed at the left end of the reversing gear shaft (6), and a first reversing gear (5) that meshes with the reverse gear (18) is fixedly installed at the right end; A power output shaft (17) is also rotatably installed on the housing (1). The power output shaft (17) is in transmission cooperation with the left end of the reversing shaft (3).

2. The power shift device according to claim 1, characterized in that, The friction mechanism includes a plurality of first steel plates (22) fixedly installed on the first hub body (20). A plurality of first friction plates (24) are fixedly installed on the transmission sleeve (25). The first friction plates (24) and the first steel plates (22) are arranged in an interlaced manner; The first piston (21) is located inside the innermost first steel plate (22) and can abut against the first steel plate (22).

3. The power shift device according to claim 1, characterized in that, The first piston (21) divides the driving chamber into a first pressure chamber (27) and a first lubricating chamber (30). Two first baffles (31) are fixedly installed on the reversing shaft (3). The two first baffles (31) are respectively located in the two first lubricating chambers (30) on both sides of the first hub body (20). A first spring (29) is provided between the first baffle (31) and the first piston (21).

4. The power shift device according to claim 3, wherein, A reversing lubricating oil passage (4) that is communicated with the hydraulic mechanism is provided on the reversing shaft (3). The reversing lubricating oil passage (4) is communicated with the two first lubricating chambers (30).

5. The power shift device according to claim 4, wherein, The left end of the reversing shaft (3) is fixedly connected to a connecting shaft (8). The left end of the connecting shaft (8) is fixedly connected to a PTO input shaft (9). The PTO input shaft (9) is in rotational cooperation with 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 combination between the two is provided between the PTO gear shaft (11) and the PTO input shaft (9). 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 to the power output shaft (17). The PTO output shaft (13) is in rotational cooperation with the housing (1).

6. The power shift device according to claim 5, wherein, 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 the PTO output shaft (13) are respectively rotatably installed with a second output gear (16) meshing with the second input gear (12) and a first output gear (14) meshing with the first input gear (10). A sliding sleeve (15) is slidably installed in the middle of the PTO output shaft (13). The sliding sleeve (15) can be power-coupled with the first output gear (14) or the second output gear (16) to drive the PTO output shaft (13) to rotate.

7. The power shift device according to claim 5, characterized in that, The clutch mechanism includes a synchronous pulley (40) fixedly sleeved on the PTO input shaft (9). A plurality of second friction plates (37) are fixedly installed on the synchronous pulley (40). A second hub (38) is also rotatably installed on the PTO input shaft (9). A plurality of second steel plates (36) are fixedly installed on the second hub (38). The second steel plates (36) and the second friction plates (37) are arranged in an interlaced manner. A second piston (35) is slidably installed in the second hub (38) and can squeeze the second steel plates (36) to make the second steel plates (36) and the second friction plates (37) power-coupled.

8. The power shift device according to claim 7, characterized in that, The second piston (35) divides the inner side of the second hub (38) into a second pressure chamber (34) communicated with the hydraulic system and a second lubricating chamber (41). A second baffle (42) is fixedly installed on the second hub (38). A second spring (43) is arranged between the second baffle (42) and the second piston (35). The second spring (43) is located in the second lubricating chamber (41).

9. The power shift device according to claim 8, characterized in that, The hydraulic mechanism includes a fine filter (45). An oil inlet (44) is provided on the fine filter (45). The 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 chamber (34) through a PTO pressure oil pipe (52), with the left first pressure chamber (27) through a forward pressure oil pipe (53), with the right first pressure chamber (27) through a reverse pressure oil pipe (54), with the fuel tank through a main return oil pipe (50), and is communicated with a lubricating oil control valve block (55) through a main lubricating oil pipe (51). The lubricating oil control valve block (55) is communicated with the second lubricating chamber (41) through a PTO lubricating oil pipe (57), with the first lubricating chamber (30) through a reversing lubricating oil pipe (56), and with the fuel tank through a lubricating oil return pipe (58).

10. The power shift device according to claim 9, wherein, An accumulator (47) is connected to the oil inlet pipe (46) through a tee.

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