Power system and tractor

Abstract

This application relates to a power system and a tractor, specifically in the field of tractor power transmission technology. It addresses, to some extent, the problem that in current tractor gearboxes, after the clutch disengages power, the power output shaft continues to rotate due to inertia, leading to power waste and even safety accidents. The power system provided in this application includes a transmission shaft, a drive gear, an output gear assembly, an output shaft, and a braking assembly. The drive gear is connected to the transmission shaft and rotates with it. The output gear assembly meshes with the drive gear and is mounted on the output shaft, transmitting power from the transmission shaft to the output shaft. The braking assembly includes a housing, a piston, and a friction element. The housing forms a braking chamber, and the piston is located within the braking chamber, dividing it into a first chamber and a second chamber. The housing has an oil passage communicating with the first chamber. The friction element is located in the second chamber, between the piston and the disc side of the output gear assembly.

Description

Technical Field

[0001] This application relates to the field of tractor power transmission technology, and more specifically, to a power system and a tractor. Background Technology

[0002] As a primary power machine in agricultural production, the tractor's power take-off (PTO) system plays a crucial role in agricultural operations. Traditional tractor gearboxes transmit engine power to downstream implements, such as rotary tillers and seeders, via the PTO clutch to meet various agronomic needs. During field operations, tractors frequently require turning and maneuvering, necessitating the use of the PTO clutch to disconnect power transmission and stop the downstream implements from working.

[0003] Existing PTO clutches typically employ mechanical or hydraulic structures, theoretically requiring a complete disconnection of power output after the operator disengages the clutch. However, due to the significant rotational inertia of the rotating components of agricultural implements, the power take-off shaft and the rear implement continue to rotate under inertia even after the clutch is disengaged. This inertial rotation is particularly pronounced under heavy-load conditions, not only preventing the implement from stopping immediately but also potentially causing accidents that could result in injury. Furthermore, this unnecessary rotation consumes engine power, leading to energy waste and impacting the overall efficiency of the tractor.

[0004] Therefore, there is an urgent need to provide a power system and tractor to compensate for the shortcomings of the existing technology to a certain extent. Utility Model Content

[0005] The purpose of this application is to provide a power system and tractor that, to a certain extent, solves the problem that, in the current stage, after the power is disengaged by the gearbox clutch of the tractor, the power output shaft continues to rotate due to inertia, resulting in power waste and even safety accidents.

[0006] To achieve the above objectives, the present invention provides a power system comprising a transmission shaft, a transmission gear, an output gear assembly, an output shaft, and a braking assembly. The transmission gear is connected to the transmission shaft and rotates with the transmission shaft. The output gear assembly meshes with the transmission gear and is disposed on the output shaft, transmitting power from the transmission shaft to the output shaft. The braking assembly comprises a housing, a piston, and a friction element. The housing forms a braking chamber, the piston is disposed within the braking chamber and divides the braking chamber into a first chamber and a second chamber. The housing forms an oil passage communicating with the first chamber. The friction element is disposed in the second chamber and is located between the piston and the disc side of the output gear assembly.

[0007] The braking assembly also includes a sealing ring, which is fitted onto the piston to prevent the first cavity and the second cavity from communicating with each other.

[0008] Specifically, an oil inlet is formed on the housing, and the oil passage includes a first connecting oil passage and a second connecting oil passage. One end of the first connecting oil passage is connected to the oil inlet, and the other end is connected to one end of the second connecting oil passage. The other end of the second connecting oil passage is connected to the first cavity.

[0009] Furthermore, the transmission gear is a double gear, and the output gear assembly includes a first output gear and a second output gear. The double gear includes a first gear and a second gear, the first gear meshing with the first output gear, and the second gear meshing with the second output gear.

[0010] The power system provided by this utility model further includes a meshing assembly, a bearing assembly, and a shift fork component. The meshing assembly is connected to the output shaft and rotates with the output shaft. The bearing assembly includes a first bearing and a second bearing. The first bearing is connected to the first output gear, and the second bearing is connected to the second output gear. A first mating portion is formed on the side of the meshing assembly facing the first output gear, and a second mating portion is formed on the first output gear corresponding to the position of the first mating portion. A third mating portion is formed on the side of the meshing assembly facing the second output gear, and a fourth mating portion is formed on the second output gear corresponding to the position of the third mating portion. The shift fork component can drive the meshing assembly to move towards the first output gear or towards the second output gear.

[0011] Specifically, the diameter of the first output gear is larger than the diameter of the second output gear.

[0012] Furthermore, the power system provided by this utility model also includes a power input shaft and a clutch; the power input shaft is connected to the input end of the clutch, and the output end of the clutch is connected to the transmission shaft.

[0013] Furthermore, the friction element is a copper-based friction plate, and there is a travel clearance between the copper-based friction plate and the first output gear, and the travel clearance is 1.5mm; both the first bearing and the second bearing are needle roller bearings.

[0014] Furthermore, in the power system provided by this utility model, the meshing component includes a meshing seat and a meshing sleeve. The meshing seat is connected to the output shaft, and the meshing sleeve is sleeved on the meshing seat. The first mating part and the third mating part are formed on both sides of the meshing sleeve.

[0015] Compared with the prior art, the power system provided by this utility model has the following advantages: The power system provided by this utility model includes a transmission shaft, a transmission gear, an output gear assembly, an output shaft, and a braking assembly. The transmission gear is connected to the transmission shaft and rotates with the transmission shaft. The output gear assembly meshes with the transmission gear and is mounted on the output shaft to transmit power from the transmission shaft to the output shaft. The braking assembly includes a housing, a piston, and a friction element. The housing forms a braking chamber, the piston is mounted inside the braking chamber, and the braking chamber is divided into a first chamber and a second chamber. The housing forms an oil passage communicating with the first chamber. The friction element is mounted in the second chamber and is located between the piston and the disc side of the output gear assembly.

[0016] As can be seen from the analysis, power can be transmitted to the transmission gear through the transmission shaft. Since the transmission gear meshes with the output gear assembly, power can be transmitted from the transmission gear to the output gear assembly. The output gear assembly in this application is connected to the output shaft, so when the output gear assembly rotates, it can drive the output shaft to rotate, thereby realizing the output of power.

[0017] Furthermore, this application forms a braking chamber on the housing, and a piston is provided inside the braking chamber. The piston can divide the braking chamber into a first chamber and a second chamber. At the same time, an oil passage connected to the first chamber is also formed on the housing. Thus, when the transmission shaft no longer receives input power, hydraulic oil is injected into the first chamber through the oil passage. This allows the oil pressure to push the piston towards the friction element until it pushes the friction element towards the wheel side of the output gear assembly. When the friction element contacts the wheel side of the output gear assembly, the friction force can be used to brake the output gear assembly. This can accelerate the stopping speed of the output gear assembly after power is cut off to a certain extent. Since the output gear assembly is connected to the output shaft, when the output gear assembly can stop quickly, the output shaft can also brake quickly, thereby achieving rapid power output cut-off. This avoids, to a certain extent, the problem of power waste or even safety accidents caused by inertial rotation.

[0018] In addition, this application also provides a tractor including the aforementioned power system.

[0019] Tractors using the power system provided in this application can respond quickly when power needs to be cut off, thereby reducing, to some extent, the problem of wasted power and safety accidents caused by the implements remaining in a non-stop state due to inertial rotation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a first-view structural schematic diagram of the power system provided in an embodiment of this application; Figure 2 A partial cross-sectional view of the power system from a second perspective provided in an embodiment of this application; Figure 3 A partial cross-sectional view of the power system from a third perspective, provided for an embodiment of this application; Figure 4 This is a schematic diagram of the oil passage formed by the housing in the power system provided in the embodiments of this application.

[0022] Icons: 1-Housing; 101-Oil inlet; 102-First connecting oil passage; 103-Second connecting oil passage; 104-Brake chamber; 2-Piston; 201-Sealing ring; 3-Friction component; 4-First gear; 5-Second gear; 6-First output gear; 7-Second output gear; 8-Meshing seat; 9-Meshing sleeve; 901-First mating part; 902-Third mating part; 10-First bearing; 11-Second bearing; 12-Rear axle housing; 13-Power input shaft; 14-Clutch; 15-Transmission shaft; 16-Output shaft; 17-Shift fork component. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for 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. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] like Figure 1 Combination Figure 2 As shown, the power system provided in this application includes a transmission shaft 15, a transmission gear, an output gear assembly, an output shaft 16, and a braking assembly. The transmission gear is connected to the transmission shaft 15 and rotates with the transmission shaft 15. The output gear assembly meshes with the transmission gear and is mounted on the output shaft 16, transmitting power from the transmission shaft 15 to the output shaft 16. The braking assembly includes a housing 1, a piston 2, and a friction element 3. The housing 1 forms a braking cavity 104. The piston 2 is disposed within the braking cavity 104 and divides the braking cavity 104 into a first cavity and a second cavity. The housing 1 forms an oil passage communicating with the first cavity. The friction element 3 is disposed in the second cavity and is located between the piston 2 and the disc side of the output gear assembly.

[0027] Compared with the prior art, the power system provided by this utility model has the following advantages: The power system provided by this utility model can transmit power to the transmission gear through the transmission shaft 15. Since the transmission gear meshes with the output gear assembly, the power can be transmitted from the transmission gear to the output gear assembly. The output gear assembly in this application is connected to the output shaft 16, so that when the output gear assembly rotates, it can drive the output shaft 16 to rotate, thereby realizing the output of power.

[0028] Furthermore, this application forms a braking chamber 104 on the housing 1, and a piston 2 is provided inside the braking chamber 104. The piston 2 can divide the braking chamber 104 into a first chamber and a second chamber. At the same time, an oil passage connected to the first chamber is also formed on the housing 1. So when the transmission shaft 15 no longer receives input power, hydraulic oil is injected into the first chamber through the oil passage. This allows the oil pressure to push the piston 2 towards the friction member 3 until it pushes the friction member 3 towards the wheel side of the output gear assembly. When the friction member 3 contacts the wheel side of the output gear assembly, it can use friction to brake the output gear assembly. This can accelerate the stopping speed of the output gear assembly after power is cut off to a certain extent. Since the output gear assembly is connected to the output shaft 16, when the output gear assembly can stop quickly, the output shaft 16 can also brake quickly, thereby achieving rapid power output cut-off. This avoids power waste and even safety accidents caused by inertial rotation to a certain extent.

[0029] It should be noted that the power system provided in this application also includes a control component, and the control component in this application adopts a two-position two-way solenoid valve, thereby enabling automatic control of the oil circuit opening and closing.

[0030] It is understood that by fitting a sealing ring 201 onto the piston 2, this application can prevent the first chamber and the second chamber from communicating with each other, thus avoiding the flow of oil affecting the movement of the piston 2.

[0031] In actual operation, when oil enters the first chamber, it can push the piston 2 to move towards the friction element 3 until the friction element 3 contacts the output gear assembly, thus completing the braking purpose.

[0032] Accordingly, such as Figure 4 As shown, the housing 1 in this application has an oil inlet 101 formed on it, and the oil passage includes a first connecting oil passage 102 and a second connecting oil passage 103. One end of the first connecting oil passage 102 is connected to the oil inlet 101, and the other end is connected to one end of the second connecting oil passage 103. The other end of the second connecting oil passage 103 is connected to the first cavity.

[0033] Hydraulic oil can be input through the oil inlet 101 formed on the housing 1, and the hydraulic oil can be input through an external oil inlet pipe. The hydraulic oil can be led to the oil inlet 101 of the first chamber through the first connecting oil passage 102 and the second connecting oil passage 103, thereby enabling the oil to drive the piston 2.

[0034] Optionally, such as Figure 1 Combination Figure 2 As shown, the transmission gear in this application is a double gear, and the output gear assembly includes a first output gear 6 and a second output gear 7. The double gear includes a first gear 4 and a second gear 5. The first gear 4 meshes with the first output gear 6, and the second gear 5 meshes with the second output gear 7.

[0035] By setting the first output gear 6 and the second output gear 7, two torque power outputs can be achieved. Therefore, the diameter of the first output gear 6 in this application is larger than the diameter of the second output gear 7.

[0036] Accordingly, the double gear in this application includes a first gear 4 that meshes with a first output gear 6, and a second gear 5 that meshes with a second output gear 7, thereby ensuring the selectivity and stability of power output.

[0037] Of course, since the diameter of the first output gear 6 is larger than the diameter of the second output gear 7, the diameter of the second gear 5 in this application is larger than the diameter of the first gear 4, thereby ensuring that the first gear 4 and the second gear 5 are coaxial, and the first output gear 6 and the second output gear 7 are coaxial.

[0038] Optionally, such as Figure 1 Combination Figure 2 As shown, the power system provided by this utility model further includes a meshing assembly, a bearing assembly, and a shift fork member 17. The meshing assembly is connected to the output shaft 16 and rotates with the output shaft 16. The bearing assembly includes a first bearing 10 and a second bearing 11. The first bearing 10 is connected to the first output gear 6, and the second bearing 11 is connected to the second output gear 7. A first mating portion 901 is formed on the side of the meshing assembly facing the first output gear 6, and a second mating portion is formed on the first output gear 6 corresponding to the position of the first mating portion 901. A third mating portion 902 is formed on the side of the meshing assembly facing the second output gear 7, and a fourth mating portion is formed on the second output gear 7 corresponding to the position of the third mating portion 902. The shift fork member 17 can drive the meshing assembly to move in a direction closer to the first output gear 6 or closer to the second output gear 7.

[0039] Under normal operating conditions, the transmission shaft 15 transmits power to the double gears, and the first gear 4 and the second gear 5 rotate synchronously, thereby driving the first output gear 6 meshing with the first gear 4 and the second output gear 7 meshing with the second gear 5 to rotate synchronously. Since the first bearing 10 is provided between the output shaft 16 and the first output gear 6, and the second bearing 11 is provided between the output shaft 16 and the second output gear 7, the first output gear 6 and the second output gear 7 can rotate relative to the output shaft 16.

[0040] When the corresponding output torque needs to be selected, the shift fork component 17 drives the meshing assembly to move towards the first output gear 6 or the second output gear 7. Since the meshing assembly is fixedly connected to the output shaft 16, when the meshing assembly is engaged with the first output gear 6, the first output gear 6 can drive the meshing assembly to rotate, thereby driving the output shaft 16 to rotate and realize the output of power.

[0041] Correspondingly, when the meshing component is engaged with the second output gear 7, the second output gear 7 can drive the meshing component to rotate, thereby driving the output shaft 16 to rotate and realize power output. Since the diameters of the first output gear 6 and the second output gear 7 are different, the number of meshing teeth is different, thus the output torque is different, and the selection of power output torque can be realized through the shift fork component 17.

[0042] It should be noted that when power is cut off and braking is required, the friction element 3 is moved towards the first output gear 6, thereby braking the first output gear 6. Conversely, if power is being output to the first output gear 6 at this time, the output shaft 16 can be directly braked through the first output gear 6.

[0043] When the second output gear 7 is outputting power at this time, when the first output gear 6 brakes, the first gear 4 can be braked. Since the first gear 4 and the second gear 5 are a double gear structure, the second gear 5 can brake synchronously. Correspondingly, the second output gear 7, which meshes with the second gear 5, is braked, thereby realizing the braking of the output shaft 16.

[0044] Optionally, such as Figure 1 Combination Figure 2 As shown, the power system provided by this utility model also includes a power input shaft 13 and a clutch 14; the power input shaft 13 is connected to the input end of the clutch 14, and the output end of the clutch 14 is connected to the transmission shaft 15.

[0045] The clutch 14 can connect and disconnect the transmission shaft 15 and the power input shaft 13. When power is needed, the transmission shaft 15 and the power input shaft 13 are connected by the clutch 14. When power needs to be cut off, the clutch 14 is used to disconnect the two, thereby stopping the power transmission.

[0046] Preferably, the friction element 3 in this application is a copper-based friction plate, and there is a stroke clearance between the copper-based friction plate and the first output gear 6, and the stroke clearance is 1.5mm; the first bearing 10 and the second bearing 11 are both needle roller bearings.

[0047] Optionally, such as Figure 3 As shown, the power system provided by this utility model includes a meshing assembly comprising a meshing seat 8 and a meshing sleeve 9. The meshing seat 8 is connected to the output shaft 16, and the meshing sleeve 9 is sleeved on the meshing seat 8. A first mating part 901 and a third mating part 902 are formed on both sides of the meshing sleeve 9.

[0048] The output shaft 16 has an internal spline or an external spline. Correspondingly, when the output shaft 16 has an external spline, the meshing seat 8 has an internal spline. Thus, through the cooperation of the internal spline and the external spline, the relative position of the meshing seat 8 and the output shaft 16 is fixed. That is, when the meshing seat 8 rotates, it can drive the output shaft 16 to rotate.

[0049] The first mating part 901 and the third mating part 902 can be processed by the mating sleeve 9 further fitted on the mating seat 8. The first mating part 901, the second mating part, the third mating part 902 and the fourth mating part in this application are also spline mating structures, so that when the fork member 17 is used to achieve engagement, stable power transmission can be achieved.

[0050] In addition, this application also provides a tractor including the aforementioned power system.

[0051] Tractors using the power system provided in this application can respond quickly when power needs to be cut off, thereby reducing, to some extent, the problem of wasted power and safety accidents caused by the implements remaining in a non-stop state due to inertial rotation.

[0052] It should be noted that the power system in this application is located in the rear axle housing 12 of the tractor. The rear axle housing 12 contains lubricating oil. There is lubricating oil between the aforementioned friction element 3 and the output gear assembly. When braking is not required, since there is no hydraulic oil input in the first chamber, the piston 2 no longer applies pressure to the friction element 3. The rotation of the output gear assembly can agitate the lubricating oil in the rear axle housing 12, thereby pushing the friction element 3 back to its initial position.

[0053] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power system, characterized in that, It includes a transmission shaft, transmission gears, output gear assembly, output shaft, and braking assembly; The transmission gear is connected to the transmission shaft and rotates with the transmission shaft. The output gear assembly meshes with the transmission gear and is mounted on the output shaft to transmit power from the transmission shaft to the output shaft. The braking assembly includes a housing, a piston, and a friction element. The housing forms a braking cavity, the piston is disposed in the braking cavity and divides the braking cavity into a first cavity and a second cavity, the housing forms an oil passage communicating with the first cavity, and the friction element is disposed in the second cavity and is located between the piston and the disc side of the output gear assembly.

2. The power system according to claim 1, characterized in that, The braking assembly also includes a sealing ring, which is fitted onto the piston to prevent the first chamber and the second chamber from communicating with each other.

3. The power system according to claim 1, characterized in that, An oil inlet is formed on the housing. The oil passage includes a first connecting oil passage and a second connecting oil passage. One end of the first connecting oil passage is connected to the oil inlet, and the other end is connected to one end of the second connecting oil passage. The other end of the second connecting oil passage is connected to the first cavity.

4. The power system according to claim 1, characterized in that, The transmission gear is a double gear, and the output gear assembly includes a first output gear and a second output gear. The double gear includes a first gear and a second gear, the first gear meshing with the first output gear, and the second gear meshing with the second output gear.

5. The power system according to claim 4, characterized in that, It also includes engagement components, bearing assemblies, and shift fork components; The meshing assembly is connected to the output shaft and rotates with the output shaft. The bearing assembly includes a first bearing and a second bearing. The first bearing is connected to the first output gear, and the second bearing is connected to the second output gear. The meshing assembly has a first mating portion formed on the side facing the first output gear, and the first output gear has a second mating portion formed at the position corresponding to the first mating portion; The meshing assembly has a third mating portion on the side facing the second output gear, and the second output gear has a fourth mating portion corresponding to the position of the third mating portion; The shift fork component can drive the engagement assembly to move toward either the first output gear or the second output gear.

6. The power system according to claim 4, characterized in that, The diameter of the first output gear is larger than the diameter of the second output gear.

7. The power system according to claim 1, characterized in that, It also includes the power input shaft and clutch; The power input shaft is connected to the input end of the clutch, and the output end of the clutch is connected to the transmission shaft.

8. The power system according to claim 5, characterized in that, The friction element is a copper-based friction plate, and there is a travel clearance between the copper-based friction plate and the first output gear, and the travel clearance is 1.5mm; Both the first bearing and the second bearing are needle roller bearings.

9. The power system according to claim 5, characterized in that, The meshing assembly includes a meshing seat and a meshing sleeve. The meshing seat is connected to the output shaft, and the meshing sleeve is fitted onto the meshing seat. The first mating part and the third mating part are formed on both sides of the meshing sleeve.

10. A tractor, characterized in that, The power system comprising any one of claims 1-9 above.

Images