Electric drive type tractor CVT power assembly adopting beam structure

Abstract

The utility model relates to tractor power system technical field, concretely is a kind of electric drive type tractor CVT power assembly using beam structure;Including rear axle, the front end of rear axle is equipped with support frame, support frame is fixedly connected with driving motor, the both ends of support frame are fixedly connected with beam, the one end of two beams away from support frame is fixedly connected with range extender, range extender is electrically connected with driving motor by storage device, the middle part of driving motor is equipped with first transmission shaft, and first transmission shaft is driven with PTO mechanism cooperation. Through the above structure, support frame and beam replace original motor shell to support, so that the support of tractor and drive are separated, and the machining difficulty of motor shell is reduced;Moreover, since the support of tractor and drive are separated, when driving motor fails, driving motor can also be individually disassembled for maintenance, so that the maintenance process is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of tractor power system technology, specifically to a CVT powertrain for an electric tractor with a crossbeam structure. Background Technology

[0002] The tractor's power system is the core component of the entire machine, mainly composed of a drive unit, transmission system, hydraulic system, power output device, and control system. These parts work together to ensure the tractor operates efficiently and stably under various working conditions. With the rapid development of the tractor industry, hybrid tractors have become increasingly common. Hybrid tractors primarily use a drive motor as the main drive unit, while a range extender composed of an engine provides electrical power to the drive motor, thereby increasing the tractor's range.

[0003] In the current technology, most hybrid tractors on the market rely on the motor housing for the load-bearing capacity of the front and rear axles. This design increases the difficulty of machining the motor housing and makes maintenance difficult. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides an electric drive tractor CVT powertrain with a crossbeam structure, thereby solving the problem that the high design requirements for the motor housing in the prior art increase the difficulty of motor housing processing and make maintenance difficult.

[0005] This utility model is achieved using the following technical solution: an electric drive tractor CVT powertrain with a crossbeam structure, including a rear axle, a support frame at the front end of the rear axle, a drive motor fixedly connected to the support frame, crossbeams fixedly connected to both ends of the support frame, a range extender fixedly connected to the end of the two crossbeams away from the support frame, the range extender being electrically connected to the drive motor through an energy storage device, and a first transmission shaft provided in the middle of the drive motor, the first transmission shaft being in transmission cooperation with a PTO mechanism.

[0006] With the above structure, the support frame and crossbeam replace the original motor housing for support, separating the tractor's support from the drive, thus reducing the processing difficulty of the motor housing; moreover, since the tractor's support and drive are separated, the drive motor can be removed and repaired separately when it fails, making the maintenance process more convenient.

[0007] Preferably, the PTO mechanism includes a PTO gearbox mounted on the rear axle. A second drive shaft, which is rotatably mounted within the PTO gearbox and drives the first drive shaft, is connected to the PTO output shaft via a speed change mechanism. This speed change mechanism has three gears: neutral, high speed, and low speed. By providing these three gears, the PTO output shaft of this device can output different torques under the action of the drive motor, thus adapting to different production processes.

[0008] Preferably, a fourth drive shaft, coaxially fixedly connected to the PTO output shaft, is rotatably mounted inside the PTO gearbox. The transmission mechanism includes a first gear and a second gear coaxially fixedly connected to the second drive shaft. A third gear meshing with the first gear and a fourth gear meshing with the second gear are coaxially rotatably connected to the fourth drive shaft. A meshing sleeve (for controlling the power engagement or disengagement with the third or fourth gear) is slidably connected to the fourth drive shaft. The meshing sleeve is poweredly engaged with the fourth drive shaft and is located between the third and fourth gears. Through the cooperation of the four gears and the meshing sleeve, different transmission ratios are achieved between the fourth drive shaft and the second drive shaft, thereby enabling the PTO output shaft to output different torques.

[0009] Preferably, the end of the PTO output shaft near the fourth drive shaft extends radially outward to form a first annular mounting plate, and the end of the fourth drive shaft near the PTO output shaft extends radially outward to form a second annular mounting plate. The first and second mounting plates are fitted together and fixedly connected by bolts. The arrangement of the first and second mounting plates makes the connection between the PTO output shaft and the fourth drive shaft more stable, and the bolted connection also facilitates the disassembly and installation of the PTO output shaft.

[0010] Preferably, the fourth transmission shaft is provided with lubrication channels for lubricating the third and fourth gears. The lubrication channels ensure smoother rotation of the third and fourth gears.

[0011] Preferably, both the rear end of the first drive shaft and the front end of the second drive shaft are provided with external splines, and the rear end of the first drive shaft and the front end of the second drive shaft are connected by a first spline sleeve provided with internal splines. The transmission connection between the first drive shaft and the second drive shaft is realized by the provision of the first spline sleeve.

[0012] Preferably, the range extender output shaft is connected to a third drive shaft via a clutch, and the third drive shaft is in drive engagement with the first drive shaft. Through the drive engagement between the third and first drive shafts, the engine output shaft in the range extender can directly drive the first drive shaft to rotate, thus enabling the tractor to move even when the drive motor has insufficient power.

[0013] Preferably, both the front end of the first drive shaft and the rear end of the third drive shaft are provided with external splines, and the front end of the first drive shaft and the rear end of the third drive shaft are connected by a second spline sleeve provided with internal splines. The transmission connection between the first drive shaft and the third drive shaft is realized by the provision of the second spline sleeve.

[0014] In summary, the beneficial effects of this utility model are as follows: By replacing the original motor housing with a support frame and crossbeam to support the rear axle, the driving and supporting functions of the motor housing are separated. The primary function of the motor housing is now simply to support the drive motor, while the supporting function is shared by the crossbeam and support frame. This allows for separate disassembly of the motor during maintenance, making maintenance more convenient. Furthermore, since the drive motor is no longer enclosed in a metal shell but directly exposed to the air, heat dissipation is improved, further increasing the service life of the drive motor. Attached Figure Description

[0015] Figure 1 This is a top view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 for Figure 2 A magnified view of a portion of area "A" in the image; Figure 4 for Figure 2 A magnified view of a portion of region "B".

[0016] In the diagram: 1-Support frame; 2-Crossbeam; 3-Drive motor; 4-First drive shaft; 5-Range extender; 6-PTO output shaft; 7-First gear; 8-Second gear; 9-Second drive shaft; 10-Rear axle; 11-First spline sleeve; 12-Third drive shaft; 13-Clutch; 14-Third gear; 15-Meshing sleeve; 16-Fourth gear; 17-Fourth drive shaft; 18-Lubricating oil passage; 19-Second spline sleeve. Detailed Implementation

[0017] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0018] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0019] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0020] like Figure 1 , Figure 2 As shown, this utility model provides an electric drive tractor CVT powertrain with a crossbeam structure, including a rear axle 10. The front end of the rear axle 10 is provided with a support frame 1, and a drive motor 3 is fixedly connected to the support frame 1. Crossbeams 2 are fixedly connected to both ends of the support frame 1. A range extender 5 is fixedly connected to the end of the two crossbeams away from the support frame 1. The range extender 5 is electrically connected to the drive motor 3 through an energy storage device. A first transmission shaft 4 is provided in the middle of the drive motor 3, and the first transmission shaft 4 is in transmission cooperation with the PTO mechanism.

[0021] The range extender 5 mainly consists of an engine and a generator. The engine output shaft and the generator input shaft are connected in a power structure. When the engine is working, the engine output shaft drives the generator input shaft to rotate, thereby generating electricity. The electricity generated by the generator is stored in an energy storage device, such as a battery. When the drive motor 3 needs it, the energy storage device will deliver the electrical energy to the drive motor.

[0022] like Figure 2 , Figure 3 As shown, the PTO mechanism described above includes a PTO gearbox located at the rear end of the rear axle 10. A second drive shaft 9, which is rotatably mounted within the PTO gearbox and drives the first drive shaft 4, is connected to a PTO output shaft 6 via a transmission mechanism. The transmission mechanism has three gears: neutral, high speed, and low speed. When the transmission mechanism is in neutral, the PTO output shaft 6 remains stationary without any external force, regardless of whether the second drive shaft 9 rotates. When the transmission mechanism is in low speed, the second drive shaft 9 rotates, and the PTO output shaft 6 outputs low speed and high torque. When the transmission mechanism is in high speed, the second drive shaft 9 rotates, and the PTO output shaft 6 outputs high speed and low torque.

[0023] Among them, Figure 2 In the sectional view, to make the illustration clearer, the drive motor 3 and the range extender 5 are represented in a simplified manner.

[0024] A fourth drive shaft 17, coaxially fixedly connected to the PTO output shaft 6, is also rotatably mounted inside the PTO gearbox. The aforementioned transmission mechanism includes a first gear 7 and a second gear 8 coaxially fixedly connected to the second drive shaft 9. A third gear 14 meshes with the first gear 7, and a fourth gear 16 meshes with the second gear 8, both rotatably connected to the fourth drive shaft 17. A meshing sleeve 15, used to control the power engagement or disengagement with the third gear 14 or the fourth gear 16, is slidably connected to the fourth drive shaft 17. The meshing sleeve 15 is located between the third gear 14 and the fourth gear 16. The meshing sleeve 15 only slides relative to the fourth drive shaft 17; that is, when the meshing sleeve 15 rotates, it also drives the fourth drive shaft 17 to rotate. The two are connected by a transmission mechanism, such as a key connection.

[0025] In this gear, the first gear 7 is larger than the second gear 8, the third gear 14 is smaller than the fourth gear 16, and the third gear 14 is larger than the first gear 7. When the engagement sleeve 15 is in the middle between the third gear 14 and the fourth gear 16, the gear transmission mechanism is in neutral. When the engagement sleeve 15 slides towards the third gear 14 and engages with the third gear 14, the gear transmission mechanism is in high gear. When the engagement sleeve 15 slides towards the fourth gear 16 and engages with the fourth gear 16, the gear transmission mechanism is in low gear.

[0026] To make the connection between the PTO output shaft 6 and the fourth drive shaft 17 more stable and to facilitate the disassembly and installation of the PTO output shaft 6, a first annular mounting plate is formed by extending the end of the PTO output shaft 6 near the fourth drive shaft 17 radially outward, and a second annular mounting plate is formed by extending the end of the fourth drive shaft 17 near the PTO output shaft 6 radially outward. The first and second mounting plates are fitted together and fixedly connected by bolts.

[0027] As a further illustration of this example, the fourth drive shaft 17 is provided with a lubrication channel 18, which can deliver lubricating oil to the third gear 14, the fourth gear 16 and the fourth drive shaft 17, thereby making their relative movement smoother, preventing jamming, reducing frictional loss and increasing service life.

[0028] In the range extender 5, the engine's output shaft is connected to a third drive shaft 12 via a clutch 13, and the third drive shaft 12 is engaged with the first drive shaft 4.

[0029] The rear end of the first drive shaft 4 and the front end of the second drive shaft 9 are both provided with external splines. The rear end of the first drive shaft 4 and the front end of the second drive shaft 9 are connected by a first spline sleeve 11 with internal splines. The front end of the first drive shaft 4 and the rear end of the third drive shaft 12 are both provided with external splines. The front end of the first drive shaft 4 and the rear end of the third drive shaft 12 are connected by a second spline sleeve 19 with internal splines.

[0030] The operating principle of this device is as follows: When the drive motor 3 drives the PTO output shaft 6 to rotate, the clutch 13 disengages, and the drive motor 3 drives the first transmission shaft 4 to rotate, thereby driving the PTO output shaft 6 to output power. When the engine in the range extender 5 drives the PTO output shaft 6 to rotate, the clutch 13 engages, and the engine drives the first transmission shaft 4 to rotate, thereby driving the PTO output shaft 6 to output power. During this process, the generator in the range extender 5 also generates electricity and stores the electrical energy in the energy storage device.

[0031] In summary, this utility model discloses an electric drive tractor CVT powertrain with a crossbeam structure. The support frame 1 and crossbeam 2 replace the original motor housing to support the rear axle 10, separating the driving and supporting functions of the motor housing. The primary function of the motor housing is now simply to support the drive motor 3, while the supporting function is shared by the crossbeam 2 and support frame 1. This allows for separate disassembly of the drive motor 3 during maintenance, making maintenance more convenient. Furthermore, since the drive motor 3 is no longer enclosed in a metal shell but directly exposed to the air, heat dissipation is improved, further increasing its service life.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A CVT powertrain for an electric tractor with a crossbeam structure, comprising a rear axle (10), characterized in that, The rear axle (10) has a support frame (1) at the front end, and a drive motor (3) is fixedly connected to the support frame (1). Both ends of the support frame (1) are fixedly connected to crossbeams (2). The ends of the two crossbeams (2) away from the support frame (1) are fixedly connected to a range extender (5). The range extender (5) is electrically connected to the drive motor (3) through an energy storage device. The drive motor (3) has a first transmission shaft (4) in the middle, and the first transmission shaft (4) is in transmission cooperation with the PTO mechanism.

2. The electric drive tractor CVT powertrain with a crossbeam structure as described in claim 1, characterized in that, The PTO mechanism includes a PTO gearbox located on the rear axle (10). A second drive shaft (9) that is driven and cooperates with the first drive shaft (4) is rotatably installed inside the PTO gearbox. The second drive shaft (9) is connected to the PTO output shaft (6) through a speed change mechanism. The speed change mechanism has three gears: neutral, high speed, and low speed.

3. The electric drive tractor CVT powertrain with a crossbeam structure according to claim 2, characterized in that, The PTO gearbox is rotatably mounted with a fourth transmission shaft (17) that is coaxially fixedly connected to the PTO output shaft (6); the transmission mechanism includes a first gear (7) and a second gear (8) that are coaxially fixedly connected to the second transmission shaft (9). The fourth transmission shaft (17) is rotatably connected with a third gear (14) that meshes with the first gear (7) and a fourth gear (16) that meshes with the second gear (8). The fourth transmission shaft (17) is slidably connected with a meshing sleeve (15) for controlling the power engagement or disengagement with the third gear (14) or the fourth gear (16). The meshing sleeve (15) is poweredly engaged with the fourth transmission shaft (17) and is located between the third gear (14) and the fourth gear (16).

4. The electric drive tractor CVT powertrain with a crossbeam structure according to claim 3, characterized in that, The PTO output shaft (6) extends radially outward from one end near the fourth drive shaft (17) to form a first annular mounting plate, and the fourth drive shaft (17) extends radially outward from one end near the PTO output shaft (6) to form a second annular mounting plate. The first mounting plate and the second mounting plate are fitted together and fixedly connected by bolts.

5. The electric drive tractor CVT powertrain with a crossbeam structure according to claim 3, characterized in that, The fourth drive shaft (17) is provided with a lubrication oil passage (18) for lubricating the third gear (14) and the fourth gear (16).

6. The electric drive tractor CVT powertrain with a crossbeam structure according to claim 2, characterized in that, The rear end of the first drive shaft (4) and the front end of the second drive shaft (9) are both provided with external splines. The rear end of the first drive shaft (4) and the front end of the second drive shaft (9) are connected by a first spline sleeve (11) provided with internal splines.

7. The electric drive tractor CVT powertrain with a crossbeam structure according to claim 1, characterized in that, The output shaft of the range extender (5) is connected to a third drive shaft (12) via a clutch (13), and the third drive shaft (12) is engaged with the first drive shaft (4).

8. The electric drive tractor CVT powertrain with a crossbeam structure according to claim 7, characterized in that, The front end of the first drive shaft (4) and the rear end of the third drive shaft (12) are both provided with external splines. The front end of the first drive shaft (4) and the rear end of the third drive shaft (12) are connected by a second spline sleeve (19) provided with internal splines.

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