New energy tractor with hydraulic lifting drive

Abstract

The invention discloses a new energy tractor with a hydraulic lifting drive, the front side of the new energy tractor is fixedly connected with a tractor power structure, and the power output end of the tractor power structure is connected with a hydraulic lifting drive assembly; the new energy tractor comprises a frame, a traction front axle arranged on the front side of the lower portion of the frame and a traction rear axle arranged on the rear side of the lower portion of the frame, a supporting plate is fixedly connected to the upper surface of the frame, and a lifting table is hinged to the middle section of the interior of the supporting plate. According to the new energy tractor, remarkable comprehensive benefits are achieved through multi-system collaborative design, the power structure of the tractor adopts a motor direct-drive gearbox and is integrated with a clutch, the advantage of electric zero emission is reserved, torque transmission stability is guaranteed through mechanical power switching, and the new energy tractor is adaptive to complex working conditions; the hydraulic lifting driving assembly innovatively utilizes the power takeoff to distribute power from the transmission shaft, can drive the hydraulic oil cylinder without additionally arranging an independent power source, and is compact in structure and low in energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy tractors, and in particular to a new energy tractor with hydraulic lifting drive. Background Art

[0002] As an important means of transportation, the performance and functionality of tractors are crucial for improving transportation efficiency and operational quality. With the rapid development of new energy technologies, new energy tractors have become a research hotspot in the industry. With their environmental and energy-saving advantages, they are gradually replacing traditional fuel-powered tractors.

[0003] However, in existing new energy tractor technology, hydraulic lift drive systems often exist as independent, additional devices that require an additional power source. This not only increases vehicle complexity and cost, but can also reduce energy efficiency. Furthermore, independent hydraulic lift drive systems require an additional power source, transmission mechanism, and control devices, increasing vehicle complexity and cost, as well as the difficulty and expense of maintenance.

[0004] In response to the above problems, this technical solution proposes a new energy tractor with hydraulic lifting drive. By combining the hydraulic lifting drive system with the main power system of the tractor, power sharing and efficient transmission are achieved. Summary of the Invention

[0005] In response to the above background technology and addressing the shortcomings of the existing technology, a new energy tractor with a hydraulic lift drive is provided. The new energy tractor of the present invention is capable of utilizing a power battery and an electric motor to form a power system, combined with an integrated clutch device to provide stable power output, and adopts a safer and more reasonable method to activate the hydraulic system, ensuring smooth and stable operation of the hydraulic system during uncoupling, while also being simple in structure and rationally designed.

[0006] In order to achieve the above-mentioned invention purpose, the technical solution provided by the patent of this invention is as follows: A new energy tractor with a hydraulic lifting drive, comprising a tractor power structure, the tractor power structure being arranged on a frame of the new energy tractor, the tractor power structure comprising an electric motor and a gearbox, the electric motor being connected to a gearbox housing, a driving gear and a speed-changing gear set being arranged within the gearbox housing, the driving gear being arranged on a power input shaft connected to an output shaft of the electric motor, the speed-changing gear set being arranged on a power output shaft, a power take-off being arranged on the gearbox housing, the driving gear of the gearbox being meshed with an input gear of the power take-off, and an output end of the power take-off being connected to a hydraulic lifting drive assembly; The hydraulic lifting drive assembly includes an oil pump and a hydraulic oil pipe connected to the output end of the oil pump, and the end of the hydraulic oil pipe is connected to a hydraulic oil cylinder, and the output end of the hydraulic oil cylinder is movably connected to the bottom of the lifting end of the lifting platform; The vehicle body includes a frame, a traction front axle is provided on the front side below the frame, and a traction rear axle is provided on the rear side below the frame. A support plate is fixedly connected to the upper surface of the frame. One end of the lifting platform is hinged to the middle of the frame, and the other end is provided at the traction rear axle as a lifting end.

[0007] In a new energy tractor with hydraulic lifting drive of the present invention, further, the bottom end of the hydraulic cylinder is hinged to the middle section of the inner cavity of the frame, and the parts arranged between the hydraulic cylinder and the oil pump include an electromagnetic reversing valve, a throttle valve, a filter and an overflow valve, and the two adjacent parts are connected by an oil guide pipe.

[0008] In a new energy tractor with hydraulic lifting drive of the present invention, further, the bottom surface of the motor is fixedly connected to the front side of the inner cavity of the frame, the bottom surface of the gearbox housing is fixedly connected to the front side of the inner cavity of the frame, and the gearbox housing is located behind the motor.

[0009] In the new energy tractor with hydraulic lifting drive of the present invention, further, the input end of the power input shaft is connected to the output shaft of the electric motor through a clutch.

[0010] In the new energy tractor with hydraulic lifting drive of the present invention, further, the power input end of the power take-off is meshed and connected with the low-gear gear on the power input shaft.

[0011] In the new energy tractor with hydraulic lifting drive of the present invention, further, the front end face of the power take-off is fixedly connected to the rear end face of the transmission housing.

[0012] In a new energy tractor with hydraulic lifting drive of the present invention, further, the power take-off is composed of a housing, a gear set and a controller, wherein the gear set includes an input gear, an output gear, a sliding gear and an intermediate transmission gear, and the power on and off is controlled by the engagement and disengagement operations of the sliding gear and the intermediate gear.

[0013] In the new energy tractor with hydraulic lifting drive of the present invention, further, the input gear penetrates into the interior of the gearbox housing and engages with the low-gear gear on the power input shaft, and the output gear is connected to the oil pump input end.

[0014] In a new energy tractor with hydraulic lifting drive of the present invention, further, the controller includes a mechanical joystick, a hydraulic valve and an electronic control unit, which are used to control the engagement and disengagement between the input gear and the low-gear gear on the power input shaft, and the hydraulic valve controls the mechanical joystick to perform the fork movement.

[0015] In the new energy tractor with hydraulic lifting drive of the present invention, further, one end of the oil pump away from the hydraulic oil pipe is connected to the hydraulic oil tank through a pipeline.

[0016] As can be seen from the above technical solution, the present invention provides a new energy tractor with hydraulic lifting drive. Compared with the prior art, the present invention has the following beneficial effects: The new energy tractor with hydraulic lifting drive of the present invention achieves significant comprehensive benefits through multi-system collaborative design: (1) The tractor power structure adopts an electric motor direct-drive gearbox and an integrated clutch, which not only retains the zero-emission advantage of electrification, but also ensures torque transmission stability through mechanical power switching and adapts to complex working conditions; (2) The hydraulic lifting drive component innovatively uses a power take-off to divert power from the drive shaft, and can drive the hydraulic cylinder without adding an independent power source, with a compact structure and reduced energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces and describes the drawings required for use in the embodiments of the present invention or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0018] Figure 1 A schematic diagram of a new energy tractor with a hydraulic lift drive according to the present invention; Figure 2 This is a schematic diagram of the overall structure of the new energy tractor of the present invention; Figure 3 This is a schematic diagram of the power structure of the tractor in the new energy tractor of the present invention; Figure 4 Schematic diagram of a hydraulic lifting drive assembly in a new energy tractor of the present invention; Figure 5 This is a partial schematic diagram of a hydraulic lifting drive assembly in a new energy tractor of the present invention; Figure 6 This is a schematic diagram of the principle of the hydraulic lifting drive component in the new energy tractor of the present invention.

[0019] Attachment Figure 1 -Attached Figure 6 The corresponding relationship between the components is as follows: 1. New energy tractor; 11. Frame; 12. Vehicle head; 13. Lifting platform; 14. Support plate; 15. Traction rear axle; 16. Traction front axle; 2. Hydraulic lifting drive assembly; 21. Power take-off; 22. Oil pump; 23. Hydraulic oil pipe; 24. Hydraulic cylinder; 3. Tractor power structure; 31. Electric motor; 32. Gearbox housing; 33. Power output shaft; 34. Power input shaft; 4. Hydraulic oil tank; 5. Overflow valve; 6. Filter; 7. Throttle valve; 8. Solenoid reversing valve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In order to make a clearer explanation and description of the technical solutions and implementation methods of the present invention, the following introduces a preferred specific embodiment for implementing the technical solutions of the present invention. Example 1

[0021] like Figure 1 and Figure 2 As shown in the figure, the present invention is a new energy tractor with a hydraulic lift drive, which is mainly composed of a new energy tractor 1, a hydraulic lift drive assembly 2, and a tractor power structure 3. In the structure of the new energy tractor 1, the frame 11 serves as the basic load-bearing component, with a traction front axle 16 installed on the lower front side and a traction rear axle 15 installed on the lower rear side. The upper surface of the frame 11 is fixedly connected to a support plate 14, and the middle section of the internal lifting platform 13 is hinged. One end of the lifting platform is rotatably fixed, and the other end acts as a lifting end, which can be raised and lowered to complete the connection and disconnection operations of the semi-trailer behind.

[0022] like Figure 3 As shown, in the tractor power structure 3, the motor 31 is fixedly connected to the front side of the frame 11 and is located directly below the cab. The rear end face of the motor 31 is connected to the gearbox housing 32. The gearbox housing 32 is provided with a driving gear and a speed change gear set. The driving gear is mounted on a power input shaft 34. The power input shaft 34 is connected to the output shaft of the motor 31 through a clutch. The speed change gear set is mounted on a power output shaft 33. The output end of the power output shaft 33 is connected to the input shaft of the gearbox.

[0023] like Figure 4 、 Figure 5 and Figure 6As shown, in the hydraulic lift drive assembly 2, an oil pump 22 is connected to the hydraulic oil tank 4 via a pipeline. The output end of the oil pump 22 is connected to a hydraulic oil pipe 23, the end of which is connected to a hydraulic cylinder 24. The bottom end of the hydraulic cylinder 24 is hinged to the middle section of the inner cavity of the vehicle frame 11, and the output end of the hydraulic cylinder 24 is movably connected to the lifting platform 13. The hydraulic oil circuit between the oil pump 22 and the hydraulic cylinder 24 is sequentially provided with components such as an electromagnetic reversing valve 8, a throttle valve 7, a filter 6, and a relief valve 5. Adjacent components are connected by an oil guide pipe. The purpose is to achieve back-and-forth movement of the hydraulic oil circuit, thereby achieving the extension and retraction of the piston rod, and achieving the raising and lowering of the piston rod to drive the raising and lowering of one end of the lifting platform.

[0024] A power take-off (POT) 21 is mounted on the sidewall of the transmission housing 32. The front end of the PTO 21 is fixedly connected to the rear end of the transmission housing 32. The power input of the PTO 21 meshes with the active low-range gear on the power input shaft 34. The PTO 21 consists of a housing, a gear train, and a controller. The gear train includes an input gear, an output gear, a sliding gear, and an intermediate transmission gear. The input gear extends through the transmission housing 32 and meshes with the low-range gear on the power input shaft 34. The output gear is connected to the input of the oil pump 22. The engagement / disengagement of the sliding gear with the intermediate gear controls power on / off. The controller includes a mechanical joystick, a hydraulic valve, and an electronic control unit to control the engagement / disengagement of the input gear with the low-range gear on the power input shaft 34. For example, the hydraulic valve controls the mechanical joystick to actuate the shift fork.

[0025] When the hydraulic lifting function is needed, the controller controls the input gear of the power take-off 21 to engage with the low-gear gear on the power input shaft 34. The power of the motor 31 is transmitted to the power take-off 21 through the tractor power structure 3. The power take-off 21 transmits the power to the oil pump 22. The oil pump 22 draws hydraulic oil from the hydraulic oil tank 4, and after passing through various components in the hydraulic oil circuit, the hydraulic oil is delivered to the hydraulic cylinder 24, pushing the piston rod of the hydraulic cylinder 24 to move, thereby driving the lifting platform 13 to perform the lifting action. When the hydraulic lifting function is not needed, the controller disengages the input gear from the low-gear gear to cut off the power transmission. Example 2

[0026] This embodiment improves upon Example 1 by improving the controller for the power take-off (POT) 21. The controller utilizes a combination of a mechanical lever and a hydraulic valve. The lever is connected to a sliding gear via a shift fork mechanism, and the hydraulic valve is linked to the lever via an oil circuit. When the operator pushes the lever, the hydraulic valve controls the oil pressure to push the shift fork, meshing the sliding gear with the intermediate transmission gear. Power is then transferred from the low-gear gear on the power take-off shaft 33 to the input gear of the PTO 21. Furthermore, the electronic control unit (ECU) is integrated into the tractor's control system. The hydraulic valve can be activated via a button or knob in the cab, achieving dual redundancy between electronic and mechanical control. Example 3

[0027] This embodiment improves the hydraulic system's oil circuit design based on Example 2. The oil inlet of the oil pump 22 is connected to the hydraulic oil tank 4 via a pipeline. The hydraulic oil tank 4 is located on the side of the vehicle frame 11 and is filled with hydraulic oil and equipped with a filter. When the power take-off 21 is activated, the oil pump 22 draws hydraulic oil from the hydraulic oil tank 4 and delivers it to the hydraulic cylinder 24 via the hydraulic oil pipe 23, pushing the lifting platform 13 to flip. The return oil port of the hydraulic cylinder 24 returns the hydraulic oil to the hydraulic oil tank 4 through another hydraulic oil pipe 23, forming a closed loop. In addition, an oil level sensor is installed on the hydraulic oil tank 4, which sends an alarm signal to the cab instrument panel when the oil level is low. Example 4

[0028] This embodiment optimizes the power transmission structure for high-load conditions. A reinforced clutch is employed between the power input shaft 34 of the tractor's power structure 3 and the output shaft of the motor 31. The number of friction plates has been increased to six, improving torque transmission capacity by 30%. The gear set of the power take-off 21 utilizes a helical gear design. The low-gear module between the input gear and the power input shaft 34 has been increased to 3.5, and the contact ratio has been increased to 1.8 to reduce engagement shock. The hydraulic cylinder 24 has a larger bore than 120 mm and a longer stroke than 800 mm. Combined with a double-acting hydraulic circuit, this allows for rapid raising and smooth lowering of the lift platform 13. Example 5

[0029] In this embodiment, the hydraulic lift drive assembly 2 is designed as a standalone module. The power take-off 21, oil pump 22, and hydraulic oil tank 4 are integrated into an aluminum alloy bracket, which is connected to the rear side of the transmission housing 32 via four bolts. The hydraulic oil pipe 23 uses a quick-connect connector, and the hinge point of the hydraulic cylinder 24 utilizes a self-lubricating bearing. The entire module is removable for easy maintenance and replacement. Furthermore, the controller of the power take-off 21 incorporates wireless communication functionality, enabling remote control of the sliding gear engagement / disengagement via a handheld terminal, making it suitable for multi-vehicle collaborative operations.

[0030] According to the above-mentioned preferred technical solution, the workflow of the technical solution is described as follows: After the new energy tractor 1 is started, the power battery (located on both sides of the frame, not shown in the figure) outputs electricity to the electric motor 31. The electric motor 31 is powered on and runs, and its output shaft transmits power to the power input shaft 34 of the tractor power structure 3 through the clutch. The power input shaft 34 engages with the power output shaft 33 in the inner cavity of the gearbox housing 32 for transmission. The power input shaft 34 transmits torque to the driving traction rear axle, and then transmits it to the wheels and tires, driving the traction front axle 16 and the traction rear axle 15 to realize vehicle travel.

[0031] When the lift platform 13 is required to unload, after shifting the transmission system into neutral, the driver activates the controller for the power take-off 21 via the in-cab operating device. If a mechanical joystick is used, the lever is manually pushed, and the hydraulic valve responds by driving the shift fork mechanism, meshing the sliding gear inside the power take-off 21 with the intermediate transmission gear. This now meshes the input gear of the power take-off 21 with the low-range gear on the power input shaft 34, diverting power from the power input shaft 34 to the power take-off 21. If an electronic control unit is used, a button sends an electrical signal, and the ECU drives the hydraulic valve to perform the same shift fork action.

[0032] Power is transmitted to the output gear via the internal gear set of power take-off 21, driving oil pump 22. Oil pump 22 draws hydraulic oil from hydraulic tank 4. This oil is then delivered via hydraulic oil pipe 23 to the rodless chamber of hydraulic cylinder 24, pushing the piston rod of hydraulic cylinder 24 out. Because the bottom end of hydraulic cylinder 24 is hinged to the midsection of vehicle frame 11 and the top end is hinged to the bottom front of lift platform 13, extending the piston rod causes the lifting end of lift platform 13 to move upward around the hinge axis, lifting the slats.

[0033] After the hanging plate is lifted and the unloading operation is completed, the driver operates the controller in reverse, the sliding gear disengages the intermediate transmission gear, the power is interrupted, the oil pump 22 stops working, and the hydraulic oil in the rod chamber of the hydraulic cylinder 24 flows back to the hydraulic oil tank 4 through the hydraulic oil pipe 23 under the action of the gravity of the lifting platform 13, the piston rod retracts, and the lifting platform 13 is reset to its initial state. During this process, if the oil level sensor detects that the oil level in the hydraulic oil tank 4 is insufficient, an alarm signal is sent to the instrument panel through the ECU; if the hydraulic lifting drive assembly 2 needs to be maintained, the four bolts connecting the aluminum alloy bracket and the gearbox housing 32 can be removed, and the modular assembly can be removed as a whole. The quick-plug connector can realize rapid separation of the hydraulic oil pipe 23, and the self-lubricating bearing ensures smooth disassembly of the hinge point of the hydraulic cylinder 24. The wireless communication function supports remote review of the status of the sliding gear inside the power take-off 21 through a handheld terminal.

[0034] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone should be aware that any structural changes made under the guidance of the present invention, and any technical solutions that are the same or similar to those of the present invention, fall within the scope of protection of the present invention. Finally, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the efficacy and purpose that can be achieved by this application, should still fall within the scope of the technical content disclosed in this application.

Claims

1. A new energy tractor with a hydraulic lifting drive, comprising a tractor power structure (3), wherein the tractor power structure (3) is arranged on a frame (11) of the new energy tractor (1), and is characterized in that: The tractor power structure (3) includes an electric motor (31) and a gearbox, the electric motor (31) is connected to the gearbox housing (32), a driving gear and a speed-changing gear set are provided in the gearbox housing (32), the driving gear is provided on a power input shaft (34), the power input shaft (34) is connected to the output shaft of the electric motor (31), the speed-changing gear set is provided on the power output shaft (33), a power take-off (21) is provided on the gearbox housing (32), the driving gear of the gearbox is meshed with the input gear of the power take-off (21), and the output end of the power take-off (21) is connected to the hydraulic lifting drive assembly (2); The hydraulic lifting drive assembly (2) includes an oil pump (22) and a hydraulic oil pipe (23) connected to the output end of the oil pump (22), and the end of the hydraulic oil pipe (23) is connected to a hydraulic oil cylinder (24), and the output end of the hydraulic oil cylinder (24) is movably connected to the bottom of the lifting end of the lifting platform (13); The new energy tractor (1) comprises a frame (11), a traction front axle (16) is provided on the front side below the frame (11), and a traction rear axle (15) is provided on the rear side below the frame (11); a support plate (14) is fixedly connected to the upper surface of the frame (11); one end of the lifting platform (13) is hinged to the middle of the frame (11), and the other end is provided at the traction rear axle (15) as a lifting end.

2. The new energy tractor with hydraulic lifting drive according to claim 1, characterized in that: The bottom end of the hydraulic cylinder (24) is hinged to the middle section of the inner cavity of the vehicle frame (11), and the parts arranged between the hydraulic cylinder (24) and the oil pump (22) include an electromagnetic reversing valve (8), a throttle valve (7), a filter (6) and a relief valve (5), and two adjacent parts are connected by an oil guide pipe.

3. The new energy tractor with hydraulic lifting drive according to claim 1, characterized in that: The bottom surface of the motor (31) is fixedly connected to the front side of the inner cavity of the vehicle frame (11), the bottom surface of the gearbox housing (32) is fixedly connected to the front side of the inner cavity of the vehicle frame (11), and the gearbox housing (32) is located behind the motor (31).

4. The new energy tractor with hydraulic lifting drive according to claim 1, characterized in that: The input end of the power input shaft (34) is connected to the output shaft of the motor (31) via a clutch.

5. The new energy tractor with hydraulic lifting drive according to claim 1, characterized in that: The power input end of the power take-off (21) is meshedly connected with the low-gear gear on the power input shaft (34).

6. The new energy tractor with hydraulic lifting drive according to claim 1, characterized in that: The front end surface of the power take-off (21) is fixedly connected to the rear end surface of the transmission housing (32).

7. The new energy tractor with hydraulic lifting drive according to claim 1, characterized in that: The power take-off (21) is composed of a housing, a gear set and a controller, wherein the gear set includes an input gear, an output gear, a sliding gear and an intermediate transmission gear, and the power on and off is controlled by the engagement and disengagement operation of the sliding gear and the intermediate gear.

8. The new energy tractor with hydraulic lifting drive according to claim 7, characterized in that: The input gear passes through the interior of the transmission housing (32) and meshes with the low-gear gear on the power input shaft (34), and the output gear is connected to the input end of the oil pump (22).

9. The new energy tractor with hydraulic lifting drive according to claim 7, characterized in that: The controller includes a mechanical joystick, a hydraulic valve and an electronic control unit, and is used to control the engagement and disengagement between the input gear and the low-gear gear on the power input shaft (34). The hydraulic valve controls the mechanical joystick to perform a shift fork action.

10. The new energy tractor with hydraulic lifting drive according to claim 1, characterized in that: One end of the oil pump (22) away from the hydraulic oil pipe (23) is connected to the hydraulic oil tank (4) via a pipeline.

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