Power reversing transmission mechanism of agricultural machine

Abstract

The invention discloses a power reversing transmission mechanism for agricultural machinery, which belongs to the technical field of transmissions, comprises a shell provided with a transmission shaft group, a chain drive system, a clutch system and an oil pump, and is characterized in that the transmission shaft group is used for power input and output and realizes power transmission through the chain drive system and the clutch system; the oil pump is connected with the clutch system and can be driven by the transmission shaft set, the transmission shaft set comprises an input shaft rotationally connected with the shell, an intermediate shaft, an output shaft and a power take-off shaft, the power take-off shaft is coaxially and rotationally connected with the input shaft and the output shaft, and the intermediate shaft is located on the side of the input shaft and is in transmission connection with the input shaft. The chain drive system is used for power transmission between the intermediate shaft and the output shaft. In the reversing process, automatic forward and backward switching and automatic power output and cut-off can be achieved, the working efficiency is improved, and meanwhile the labor intensity is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of transmissions, and in particular relates to a power reversing transmission mechanism for agricultural machinery. Background Art

[0002] At present, tractors or similar agricultural power machinery generally use a dry main clutch with a mechanical separation structure. When changing gears, changing driving directions, or switching power take-off mechanisms, it is necessary to step on the clutch pedal to cut off the power transmitted from the engine, and then select the desired gear or realize the engagement and separation of the power take-off mechanism through the mechanical gear lever. When switching the driving direction, not only do you need to step on the clutch pedal, but you also need to stop the car before switching forward / reverse. When switching directions, the power take-off mechanism needs to separate the power output, which also requires stepping on the clutch pedal to achieve. The entire operation process is cumbersome and laborious. Especially when working on smaller plots, it is necessary to change the driving direction frequently, which places high demands on the driver's work intensity. At the same time, since the car needs to be stopped before changing the driving direction, the operation efficiency is greatly reduced.

[0003] In view of the above situation, in recent years, the domestic agricultural machinery industry has been vigorously promoting the development of power reversing technology. The invention with application number CN202322913002.7 discloses a tractor power reversing assembly, and the invention with application number CN202322015249.7 discloses a tractor power reversing transmission device, which respectively realizes the power reversing function through different combinations of two sets of clutches. However, since the power take-off mechanism is also frequently switched during use, and the agricultural machinery chassis has extremely high requirements for the structural layout of the transmission system, a highly integrated product is needed to simultaneously meet the functional requirements of power reversing and automatic switching of power take-off, and at the same time, highly integrated to meet the layout requirements, and promote the advancement of agricultural machinery modernization technology.

[0004] The US invention patent with application number US18608684 discloses a transmission system for a hybrid drive unit, which includes a centrifugal clutch connected to a driven shaft and connectable to a motor, and a clutch slider element connected to a rotor of the motor and slideable between three engagement positions relative to the centrifugal clutch. The transmission system also includes a clutch override assembly, which is used to rotatably connect the centrifugal clutch and the clutch slider element to provide continuous torque transmission to the driven shaft when switching between a pure electric drive mode and at least one hybrid drive mode. The invention can achieve rapid power transmission, but in the prior art, agricultural machinery needs to perform frequent power reversing during operation, and the reversing operation is relatively cumbersome. The above-mentioned US invention patent does not solve this problem. Summary of the invention

[0005] The object of the present invention is to provide a highly integrated agricultural machinery power reversing transmission mechanism with high transmission efficiency and simple reversing operation.

[0006] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: A power reversing transmission mechanism for agricultural machinery comprises: a housing, wherein the housing is provided with a transmission shaft group, a chain drive system, a clutch system and an oil pump, and wherein the transmission shaft group is used for power input and output, the transmission shaft group realizes power transmission through the chain drive system and the clutch system, and the oil pump is connected to the clutch system and can be driven by the transmission shaft group.

[0007] The transmission shaft group includes an input shaft, an intermediate shaft, an output shaft and a power take-off shaft that are rotationally connected to the housing. The power take-off shaft is coaxially rotationally connected to the input shaft and the output shaft respectively. The intermediate shaft is located on the side of the input shaft and the two are transmission-connected. The chain drive system is used for power transmission between the intermediate shaft and the output shaft. The power take-off shaft is rotationally connected to the input shaft and the output shaft respectively through bearings. The input shaft, the intermediate shaft, the output shaft and the power take-off shaft are each mounted on the housing through bearings and can rotate independently. The coaxial rotation connection of the input shaft, the output shaft and the power take-off shaft reduces the lateral interference between the shaft bodies during the power transmission process, reduces the wear of the shaft bodies, and improves the stability of the transmission system. While the shaft bodies are assembled and connected to the housing through bearings, the shaft bodies are connected through bearings to ensure the coaxiality of multiple shaft bodies, which helps to improve the mechanical transmission efficiency. The power take-off shaft passes through the output shaft and one end is rotatably connected to the input shaft. The power take-off shaft and the output shaft are coaxially arranged, which reduces the layout space of the transmission shaft group in the axial direction, makes the structure of the entire transmission system compact, and reduces the manufacturing cost of the system.

[0008] The chain drive system includes a sprocket W3 and a chain CH2. The sprocket W3 is coaxially sleeved on the intermediate shaft, and the chain CH2 is used to realize the power transmission between the sprocket W3 and the output shaft. The chain drive system realizes the connection between the non-coaxial intermediate shaft and the output shaft through the sprocket W3 and the chain CH2. The clutch system can realize the power transmission, which helps to reduce the pressure acting on the intermediate shaft and the output shaft, and stabilize the transmission efficiency of the intermediate shaft and the output shaft.

[0009] The chain drive system also includes a sprocket W1, a chain CH1 and a sprocket. The oil pump is fixed in the housing 1. The sprocket W1 is fixed to the driving end of the oil pump OP. The sprocket W2 is fixed to the intermediate shaft S2. The chain CH1 is respectively connected to the sprocket W1 and the sprocket W2. The above connection method realizes the work of driving the oil pump through the intermediate shaft.

[0010] The clutch system includes a power take-off clutch system, which is used to realize power transmission between the input shaft and the power take-off shaft.

[0011] The power take-off clutch system includes an outer hub H1, an inner hub H2, a return spring group SP1, an active friction plate group CL1, a driven friction plate group CL2 and a piston P1. The outer hub H1 is connected to the input shaft, and the piston P1 is installed in the inner cavity of the outer hub H1. One side of the return spring group SP1 contacts the piston P1, and the other side of the return spring group SP1 is fixed to the outer hub H1. The inner hub H2 is connected to the power take-off shaft, the active friction plate group CL1 is connected to the outer hub H1, and the driven friction plate group CL2 is connected to the inner hub H2. Through the control of the solenoid valve, the oil pressure established by the oil pump is introduced into the cavity of the piston P1 and the outer hub H1, and the piston P1 will push the active friction plate group CL1 and the driven friction plate group CL2 to combine. At this time, the power of the input shaft passes through the outer hub H1, the active friction plate group CL1, the driven friction plate group CL2, and the inner hub H2 in turn, and finally the power is transmitted to the power take-off shaft; Through the control of the solenoid valve, after the pressure oil in the piston P1 is cut off, the return spring SP1 will push the piston P1 back to its original position, so that the active friction plate group CL1 and the driven friction plate group CL2 are separated, thereby cutting off the power of the power take-off shaft S4. The through-center setting of the power take-off shaft and the output shaft ensures that the various components of the power take-off clutch system can be relatively concentratedly arranged at the connection between the input shaft and the power take-off shaft, that is, the spatial layout of the power take-off clutch system is optimized and the axial layout length is reduced. On the one hand, it reduces the manufacturing cost of the power take-off clutch system, and on the other hand, it helps to reduce the stroke amplitude of the piston P1 to push out and retract, and improve the response speed of power transmission and cutting; Since the power take-off shaft passes through the output shaft and is connected to the input shaft through a bearing, the outer hub H1 and the inner hub H2 surround the outer periphery of the bearing at the connection. On the one hand, it can realize the transition connection between the input shaft and the power take-off shaft, further ensure the coaxiality of the shaft rotation, and reduce the power loss caused by the shaking during the shaft rotation. On the other hand, the inner hub H2 can reduce the loss of lubricating oil in the bearing at the connection between the input shaft and the power take-off shaft, reduce the frequency of lubricating oil addition, reduce maintenance costs, and ensure the smoothness of power transmission of the power take-off shaft.

[0012] The clutch system also includes a reversing clutch system, which is used to realize power transmission between the input shaft and the output shaft and power transmission between the intermediate shaft and the sprocket W3.

[0013] The reversing clutch system includes an outer hub H4, an inner hub H3, a return spring group SP2, an active friction plate group CL4, a driven friction plate group CL3 and a piston P2. The outer hub H4 is connected to the output shaft, and the piston P2 is installed in the inner cavity of the outer hub H4. One side of the return spring group SP2 is in contact with the piston P2, and the other side of the return spring group SP2 is fixed to the outer hub H4. The inner hub H3 is connected to the outer hub H1, the active friction plate group CL4 is connected to the inner hub H3, and the driven friction plate group CL3 is connected to the outer hub H4. Through the control of the solenoid valve, the oil pressure established by the oil pump is introduced into the cavity of the piston P2 and the outer hub H4. The piston P2 will push the driven friction plate group CL3 and the active friction plate group CL4 to combine, so that the output shaft and the input shaft are fixed and run together, and finally forward output in the same direction is achieved; After the pressure oil in the piston P2 is cut off by the solenoid valve, the return spring group SP2 will push the piston P2 back to its original position, so that the driven friction plate group CL3 and the active friction plate group CL4 are separated, thereby cutting off the power of the output shaft; The coaxial rotating connection between the input shaft and the output shaft helps to improve the contact stability when the driven friction plate group CL3 and the active friction plate group CL4 are combined. That is, the driven friction plate group CL3 can maintain the same posture and close contact with the active friction plate group CL4. On the one hand, it improves the power transmission efficiency from the input shaft to the output shaft. On the other hand, it reduces the severe local wear of the friction plate due to the tilted posture, reduces the possibility of friction plate damage caused by gear shifting during driving, improves driving safety, and reduces maintenance costs.

[0014] The reversing clutch system also includes an outer hub H6, an inner hub H5, a return spring group SP3, an active friction plate group CL5, a driven friction plate group CL6 and a piston P3. The outer hub H6 is connected to the intermediate shaft, the piston P3 is installed in the inner cavity of the outer hub H6, one side of the return spring group SP3 is in contact with the piston P3, and the other side of the return spring group SP3 is fixed to the outer hub H6, the inner hub H5 is connected to the sprocket W3, the active friction plate group CL5 is connected to the outer hub H6, and the driven friction plate group CL6 is connected to the inner hub H5. Through the control of the solenoid valve, the oil pressure established by the oil pump is introduced into the cavity of the piston P3 and the outer hub H6, and the piston P3 will push the active friction plate group CL5 and the driven friction plate group CL6 to combine, so as to achieve the fixation and synchronous operation of the intermediate shaft and the sprocket W3, thereby realizing the reverse output of power between the output shaft and the input shaft, and finally realizing the reverse gear output; After the pressure oil in the piston P3 is cut off by the solenoid valve, the return spring group SP3 will push the piston P3 back, so that the active friction plate group CL5 and the driven friction plate group CL6 are separated, thereby cutting off the power of the output shaft; since the power take-off shaft and the output shaft are set through the center, the power take-off clutch system and the reversing clutch system can be concentrated in the space between the input shaft, the output shaft and the power take-off shaft at the rotating connection. The oil pressure established by the oil pump can quickly switch between the piston P3 and the piston P2, which speeds up the corresponding speed of shifting between the forward gear and the reverse gear, which helps to improve the efficiency of vehicle operation and vehicle driving.

[0015] The above-mentioned clutch reversing system only needs to input instructions to the oil pump to realize the function of automatically switching the driving direction of the vehicle while driving, as well as the automatic engagement and separation of the power take-off mechanism. That is, the power reversing and electronically controlled automatic power take-off of the transmission system can be realized through simple instructions. It not only realizes automatic control to improve work efficiency and reduce labor intensity, but also through optimized structural design, the structural scheme of the entire transmission system is compact and the system cost is reduced.

[0016] Since the present invention realizes automatic control of the power of the power take-off shaft by controlling the power take-off clutch, it has the following technical effects: the input shaft and the output shaft power take-off shaft are coaxially arranged and can realize independent rotation through bearings respectively, and realize power transmission in cooperation with the chain drive system and the clutch system, thereby improving the power transmission efficiency; the power take-off shaft passes through the output shaft, thereby reducing the axial layout length of the transmission shaft group and reducing the manufacturing cost; the through-center arrangement of the power take-off shaft and the output shaft reduces the stroke amplitude of the piston and improves the response speed; the inner hub H2 surrounds the outer side of the connection between the input shaft and the power take-off shaft, thereby reducing the leakage of lubricating oil and ensuring the power transmission stability of the power take-off shaft; the clutch reversing system only needs to input instructions to the oil pump to realize power reversing and electronically controlled automatic power take-off, thereby improving working efficiency and reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of a power reversing transmission mechanism for agricultural machinery; Figure 2 for Figure 1 A magnified schematic diagram of the middle A area; Figure 3 for Figure 1 A magnified schematic diagram of the middle B area; Figure 4 It is a schematic diagram of the structure of sprocket W4; Figure 5 It is a partial cross-sectional schematic diagram of sprocket W4; Figure 6 It is a cross-sectional schematic diagram of the sprocket and auxiliary parts.

[0018] Reference numerals: housing 1; input shaft S1; intermediate shaft S2; output shaft S3; power take-off shaft S4; oil pump OP; bearing B1; bearing B2; bearing B3; bearing B4; bearing B5; bearing B6; bearing B7; sprocket W1; chain CH1; sprocket W2; chain CH2; sprocket W3; sprocket W4; outer hub H1; inner hub H2; return spring group SP1; active friction plate group CL1; driven friction plate group CL2; piston P1; outer Hub H4; inner hub H3; return spring group SP2; active friction plate group CL4; driven friction plate group CL3; piston P2; outer hub H6; inner hub H5; return spring group SP3; active friction plate group CL5; driven friction plate group CL6; piston P3; wheel body 20; axial hole 21; mounting hole 22; first circular arc wall 221; second circular arc wall 222; auxiliary element 3; outer shell 30; hollow groove 31; cylindrical pin 32; limit portion 33. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described in detail below in conjunction with specific implementations and drawings: Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Embodiment 1: See attached Figure 1 -Attached Figure 3 A power reversing transmission mechanism for agricultural machinery comprises: a housing 1, wherein the housing 1 is provided with a transmission shaft group, a chain drive system, a clutch system and an oil pump OP, and wherein the transmission shaft group is used for power input and output, the transmission shaft group realizes power transmission through the chain drive system and the clutch system, and the oil pump OP is connected to the clutch system and can be driven by the transmission shaft group.

[0021] The transmission shaft group includes an input shaft S1, an intermediate shaft S2, an output shaft S3 and a power take-off shaft S4 which are rotationally connected to the housing 1. The power take-off shaft S4 is coaxially rotationally connected to the input shaft S1 and the output shaft S3 respectively. The intermediate shaft S2 is located on the side of the input shaft S1 and the two are transmission-connected. The chain drive system is used for power transmission between the intermediate shaft S2 and the output shaft S3. The power take-off shaft S4 is rotationally connected to the input shaft S1 and the output shaft S3 respectively through bearings. The input shaft S1, the intermediate shaft S2, the output shaft S3 and the power take-off shaft S4 are each mounted on the housing 1 through bearings and can rotate independently. The coaxial rotation connection of the input shaft S1, the output shaft S3 and the power take-off shaft S4 reduces the lateral interference between the shaft bodies during the power transmission process, reduces the wear of the shaft bodies, and improves the stability of the transmission system. While the shaft bodies are assembled and connected to the housing 1 through bearings, the shaft bodies are connected through bearings to ensure the coaxiality of multiple shaft bodies, which helps to improve the mechanical transmission efficiency. The power take-off shaft S4 passes through the output shaft S3 and one end is rotatably connected to the input shaft S1. The power take-off shaft S4 and the output shaft S3 are coaxially arranged, which reduces the layout space of the transmission shaft group in the axial direction, makes the structure of the entire transmission system compact, and reduces the manufacturing cost of the system.

[0022] It should be noted that: the input shaft S1 is connected to the housing 1 through the bearing B1, the output shaft S3 is connected to the housing 1 through the bearing B4, the power take-off shaft S4 is coaxially installed with the input shaft S1 through the bearing B2, and the power take-off shaft S4 is coaxially installed with the output shaft S3 through the bearing B3; The intermediate shaft S2 is connected to the housing 1 through bearings B5 and B6 at both ends; The chain drive system includes a sprocket W3 and a chain CH2. The sprocket W3 is coaxially sleeved on the intermediate shaft S2. The chain CH2 is used to realize the power transmission between the sprocket W3 and the output shaft S3. The chain drive system realizes the connection between the non-coaxial intermediate shaft S2 and the output shaft S3 through the sprocket W3 and the chain CH2. The clutch system can realize the power transmission, which helps to reduce the pressure acting on the intermediate shaft S2 and the output shaft S3, prolong the service life of the shaft, improve the safety of vehicle operation, and also stabilize the transmission efficiency of the intermediate shaft S2 and the output shaft S3 to enhance the efficiency of vehicle operation.

[0023] The chain drive system also includes a sprocket W1, a chain CH1 and a sprocket. The oil pump OP is fixed in the housing 11. The sprocket W1 is fixed to the driving end of the oil pump OPOP. The sprocket W2 is fixed to the intermediate shaft S2S2. The chain CH1 is respectively connected to the sprocket W1 and the sprocket W2.

[0024] It should be noted that the sprocket W3 is coaxially mounted on the intermediate shaft S2 through the bearing B7.

[0025] The clutch system includes a power take-off clutch system, which is used to realize power transmission between the input shaft S1 and the power take-off shaft S4.

[0026] The power take-off clutch system includes an outer hub H1, an inner hub H2, a return spring group SP1, an active friction plate group CL1, a driven friction plate group CL2 and a piston P1. The outer hub H1 is connected to the input shaft S1, and the piston P1 is installed in the inner cavity of the outer hub H1. One side of the return spring group SP1 contacts the piston P1, and the other side of the return spring group SP1 is fixed to the outer hub H1. The inner hub H2 is connected to the power take-off shaft S4, the active friction plate group CL1 is connected to the outer hub H1, and the driven friction plate group CL2 is connected to the inner hub H2. Through the control of the solenoid valve, the oil pressure established by the oil pump OP is introduced into the cavity of the piston P1 and the outer hub H1, and the piston P1 will push the active friction plate group CL1 and the driven friction plate group CL2 to combine. At this time, the power of the input shaft S1 passes through the outer hub H1, the active friction plate group CL1, the driven friction plate group CL2, and the inner hub H2 in turn, and finally the power is transmitted to the power take-off shaft S4; Through the control of the solenoid valve, after the pressure oil in the piston P1 is cut off, the return spring group SP1 will push the piston P1 back to its original position, so that the active friction plate group CL1 and the driven friction plate group CL2 are separated, thereby cutting off the power of the power take-off shaft S4S4. The through-center setting of the power take-off shaft S4 and the output shaft S3 ensures that the various components of the power take-off clutch system can be relatively concentratedly arranged at the connection between the input shaft S1 and the power take-off shaft S4, that is, the spatial layout of the power take-off clutch system is optimized and the axial layout length is reduced. On the one hand, it reduces the manufacturing cost of the power take-off clutch system, and on the other hand, it helps to reduce the stroke amplitude of the piston P1 to push out and retract, and improve the response speed of power transmission and cutting; Since the power take-off shaft S4 passes through the output shaft S3 and is connected to the input shaft S1 through a bearing, the outer hub H1 and the inner hub H2 surround the outer periphery of the bearing at the connection. On the one hand, it can achieve a transition connection between the input shaft S1 and the power take-off shaft S4, further ensure the coaxiality of the shaft rotation, and reduce the power loss caused by shaking during the shaft rotation. On the other hand, the inner hub H2 can reduce the loss of lubricating oil in the bearing at the connection between the input shaft S1 and the power take-off shaft S4, reduce the frequency of lubricating oil addition, and reduce maintenance costs.

[0027] The clutch system also includes a reversing clutch system, which is used to realize power transmission between the input shaft S1 and the output shaft S3 and power transmission between the intermediate shaft S2 and the sprocket W3.

[0028] The reversing clutch system includes an outer hub H4, an inner hub H3, a return spring group SP2, an active friction plate group CL4, a driven friction plate group CL3 and a piston P2. The outer hub H4 is connected to the output shaft S3, and the piston P2 is installed in the inner cavity of the outer hub H4. One side of the return spring group SP2 is in contact with the piston P2, and the other side of the return spring group SP2 is fixed to the outer hub H4. The inner hub H3 is connected to the outer hub H1, the active friction plate group CL4 is connected to the inner hub H3, and the driven friction plate group CL3 is connected to the outer hub H4. Through the control of the solenoid valve, the oil pressure established by the oil pump OP is introduced into the cavity of the piston P2 and the outer hub H4. The piston P2 will push the driven friction plate group CL3 and the active friction plate group CL4 to combine, so that the output shaft S3 and the input shaft S1 are fixed and run together, and finally forward output in the same direction is achieved; After the pressure oil in the piston P2 is cut off by the solenoid valve, the return spring group SP2 will push the piston P2 back to its original position, so that the driven friction plate group CL3 and the active friction plate group CL4 are separated, thereby cutting off the power of the output shaft S3; The coaxial rotational connection between the input shaft S1 and the output shaft S3 helps to improve the contact stability when the driven friction plate group CL3 and the active friction plate group CL4 are combined, that is, the driven friction plate group CL3 can maintain the same posture and close contact with the active friction plate group CL4, on the one hand, it improves the efficiency of power transmission from the input shaft S1 to the output shaft S3, on the other hand, reduces the severe local wear of the friction plate due to the tilted posture, reduces the possibility of friction plate damage caused by gear shifting during driving, improves driving safety and reduces maintenance costs.

[0029] The reversing clutch system also includes an outer hub H6, an inner hub H5, a return spring group SP3, an active friction plate group CL5, a driven friction plate group CL6 and a piston P3. The outer hub H6 is connected to the intermediate shaft S2, the piston P3 is installed in the inner cavity of the outer hub H6, one side of the return spring group SP3 is in contact with the piston P3, and the other side of the return spring group SP3 is fixed to the outer hub H6, the inner hub H5 is connected to the sprocket W3, the active friction plate group CL5 is connected to the outer hub H6, and the driven friction plate group CL6 is connected to the inner hub H5. Through the control of the solenoid valve, the oil pressure established by the oil pump OP is introduced into the cavity of the piston P3 and the outer hub H6, and the piston P3 will push the active friction plate group CL5 and the driven friction plate group CL6 to combine, so as to achieve the fixation and synchronous operation of the intermediate shaft S2 and the sprocket W3, thereby realizing the reverse output of power between the output shaft S3 and the input shaft S1, and finally realizing the reverse gear output; After the pressure oil in the piston P3 is cut off by the solenoid valve, the return spring group SP3 will push the piston P3 back to its original position, so that the active friction plate group CL5 and the driven friction plate group CL6 are separated, thereby cutting off the power of the output shaft S3; Since the power take-off shaft S4 and the output shaft S3 are arranged through the center, the power take-off clutch system and the reversing clutch system can be concentrated in the space at the rotational connection of the input shaft S1, the output shaft S3 and the power take-off shaft S4. The oil pressure established by the oil pump OP can quickly switch between the piston P3 and the piston P2, which speeds up the corresponding shifting rate between the forward gear and the reverse gear, and helps to improve the efficiency of vehicle operation and vehicle driving.

[0030] The above-mentioned clutch reversing system only needs to input instructions to the oil pump OP to realize the function of automatically switching the driving direction of the vehicle while driving, as well as the automatic engagement and separation of the power take-off mechanism. That is, the power reversing and electronically controlled automatic power take-off of the transmission system can be realized through simple instructions. It not only realizes automatic control to improve work efficiency and reduce labor intensity, but also makes the structural scheme of the entire transmission system compact and reduces system costs through optimized structural design.

[0031] Embodiment 2: See attached Figure 4 -Attached Figure 6 , on the basis of Embodiment 1 of the present invention, a sprocket W4 is coaxially provided on the output shaft S3, the chain CH2 is respectively connected to the sprocket W4 and the sprocket W3, and the outer hub H4 is arranged on one side of the sprocket W4; The sprocket W2 includes a wheel body 20 , which has an axial hole 21 for assembling with the output shaft S3 . The wheel body 20 also has a mounting hole 22 arranged around the axial hole 21 , and an elastically deformable auxiliary element 3 is inserted into the mounting hole 22 .

[0032] The auxiliary element 3 includes an outer sleeve 30 that matches the mounting hole 22. The outer sleeve 30 is an elastic cylinder and has a hollow groove 31 arranged along the axis. A cylindrical pin 32 is installed in the hollow groove 31. It should be noted that the cylindrical pin 32 can squeeze the outer casing 30 under the action of inertia, and the material of the cylindrical pin 32 includes but is not limited to metal.

[0033] The mounting hole 22 includes two concentrically arranged first arc walls 221, which are radially arranged on opposite sides of the auxiliary element 3. The first arc wall 221 has the same radius as the outer sleeve 30. The mounting hole 22 also includes two second arc walls 222, which are between the two first arc walls 221 and arranged opposite to each other. The centers of the two second arc walls 222 are respectively located on both sides of the center of the first arc wall 221, and the arc diameter of the second arc wall 222 is smaller than the outer diameter of the outer sleeve 30.

[0034] The cylindrical pin 32 passes through the hollow slot 31 and has a limiting portion 33 at the end. The limiting portion 33 is matched with the end surface of the wheel body 20 .

[0035] Under the operation of the clutch system, the power of the intermediate shaft is successively transmitted to the sprocket W3, the chain CH2, the sprocket W4 and finally to the output shaft S3 to realize the reverse gear power output. At this time, the sprocket W4 rotates synchronously with the output shaft S3. There is mechanical interference in the process of the sprocket W3 transmitting power to the sprocket W4 through the chain CH2. The mechanical interference can be buffered by the deformation of the outer casing, which is beneficial to improve the stability of the power transmission of the chain drive system in the case of sudden acceleration or braking. When it is necessary to quickly switch between the forward gear and the reverse gear, or when the power output needs to be interrupted urgently, the sprocket W4 and the output shaft S3 synchronously stop the current rotation, and the cylindrical pin 32 in the first arc wall 22 maintains the original motion state due to its own inertia and squeezes the outer casing 30, so that the outer casing 30 deforms into the second arc wall 222 on one side, further eliminating vibration interference and improving the stability and centering of each sprocket and chain in the chain drive system; At the same time, since the outer sleeve 30 is fitted in the two first arc walls 221, that is, interval spaces are formed between the outer sleeve 30 and the second arc walls 222 on both sides, when the cylindrical pin 32 squeezes the outer sleeve 30 to deform, the outer sleeve 30 and the interval space on one side are squeezed and release airflow, which can blow air to the outer hub H4 located on one side thereof, thereby cooling the outer hub H4, and indirectly dissipating the heat of the brake pad group on the inner side of the outer hub H4, that is, automatically cooling and dissipating the heat of the brake pad group during the braking process and the power shifting process, which on the one hand improves the braking effect of the brake pad group, and on the other hand reduces the possibility of damage to the brake pad group due to excessive wear caused by high temperature, thereby extending the service life of the brake pad group and improving braking safety.

[0036] Since the second arc walls 222 are arranged opposite to each other, the outer shell can be deformed and squeezed in the spacing space on the corresponding side regardless of reverse gear braking or forward gear braking to achieve exhaust and heat dissipation, that is, it can improve the braking efficiency of reverse gear braking and the braking efficiency of forward gear braking to improve the vehicle operating efficiency.

[0037] The technical solution of the present invention can meet the requirements of tractors of different horsepower ranges for the gear positions of the auxiliary transmission system, realize multi-gear power shifting during operation, and the power system can automatically adapt to the requirements of different operating conditions, improve operating efficiency, reduce energy consumption, and reduce labor intensity, and provide a technical basis for unmanned operation.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A power reversing transmission mechanism for agricultural machinery, comprising: A housing (1) is provided with a transmission shaft group, a chain drive system, a clutch system and an oil pump (OP), wherein the transmission shaft group is used for power input and output, the transmission shaft group realizes power transmission through the chain drive system and the clutch system, and the oil pump (OP) is connected to the clutch system and can be driven by the transmission shaft group.

2. The agricultural machinery power reversing transmission mechanism according to claim 1, characterized in that: The transmission shaft assembly comprises an input shaft (S1), an intermediate shaft (S2), an output shaft (S3) and a power take-off shaft (S4) which are rotationally connected to the housing (1); the power take-off shaft (S4) is coaxially rotationally connected to the input shaft (S1) and the output shaft (S3), respectively; the intermediate shaft (S2) is located on the side of the input shaft (S1) and the two are transmission-connected; and the chain drive system is used for power transmission between the intermediate shaft (S2) and the output shaft (S3).

3. The agricultural machinery power reversing transmission mechanism according to claim 2, characterized in that: The power take-off shaft (S4) passes through the output shaft (S3) and one end is rotationally connected to the input shaft (S1).

4. The agricultural machinery power reversing transmission mechanism according to claim 2, characterized in that: The chain drive system comprises a sprocket W3 and a chain CH2. The sprocket W3 is coaxially sleeved on the intermediate shaft (S2). The chain CH2 is used to realize power transmission between the sprocket W3 and the output shaft (S3).

5. The agricultural machinery power reversing transmission mechanism according to claim 2, characterized in that: The chain drive system further comprises a sprocket W1, a chain CH1 and a sprocket W2, the oil pump (OP) is fixed in the housing (1), the sprocket W1 is fixed to the driving end of the oil pump (OP), the sprocket W2 is fixed to the intermediate shaft (S2), and the chain CH1 is respectively connected to the sprocket W1 and the sprocket W2 in driving connection.

6. The agricultural machinery power reversing transmission mechanism according to claim 4, characterized in that: The clutch system comprises a power take-off clutch system, and the power take-off clutch system is used to realize power transmission between the input shaft (S1) and the power take-off shaft (S4).

7. The agricultural machinery power reversing transmission mechanism according to claim 6, characterized in that: The power take-off clutch system includes an outer hub H1, an inner hub H2, a return spring group SP1, an active friction plate group CL1, a driven friction plate group CL2 and a piston P1. The outer hub H1 is connected to the input shaft (S1), the piston P1 is installed in the inner cavity of the outer hub H1, one side of the return spring group SP1 is in contact with the piston P1, and the other side of the return spring group SP1 is fixed to the outer hub H1, the inner hub H2 is connected to the power take-off shaft (S4), the active friction plate group CL1 is connected to the outer hub H1, and the driven friction plate group CL2 is connected to the inner hub H2.

8. The agricultural machinery power reversing transmission mechanism according to claim 7, characterized in that: The clutch system further comprises a reversing clutch system, which is used to realize power transmission between the input shaft (S1) and the output shaft (S3) and power transmission between the intermediate shaft (S2) and the sprocket W3.

9. The agricultural machinery power reversing transmission mechanism according to claim 8, characterized in that: The reversing clutch system includes an outer hub H4, an inner hub H3, a return spring group SP2, an active friction plate group CL4, a driven friction plate group CL3 and a piston P2. The outer hub H4 is connected to the output shaft (S3), and the piston P2 is installed in the inner cavity of the outer hub H4. One side of the return spring group SP2 is in contact with the piston P2, and the other side of the return spring group SP2 is fixed to the outer hub H4. The inner hub H3 is connected to the outer hub H1, the active friction plate group CL4 is connected to the inner hub H3, and the driven friction plate group CL3 is connected to the outer hub H4.

10. The agricultural machinery power reversing transmission mechanism according to claim 8, characterized in that: The reversing clutch system also includes an outer hub H6, an inner hub H5, a return spring group SP3, an active friction plate group CL5, a driven friction plate group CL6 and a piston P3. The outer hub H6 is connected to the intermediate shaft (S2), and the piston P3 is installed in the inner cavity of the outer hub H6. One side of the return spring group SP3 is in contact with the piston P3, and the other side of the return spring group SP3 is fixed to the outer hub H6. The inner hub H5 is connected to the sprocket W3, the active friction plate group CL5 is connected to the outer hub H6, and the driven friction plate group CL6 is connected to the inner hub H5.

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