Driving assembly for tractor and tractor

Abstract

The invention relates to the technical field of agricultural machinery, in particular to a driving assembly for a tractor and the tractor. The driving assembly for the tractor comprises an engine, a first driving motor, a speed change mechanism, an output transmission shaft and a first planet row. The first planet row comprises three rotating parts which are coaxially arranged, and the three rotating parts are a sun gear, a planet carrier and a gear ring respectively; the engine and the first driving motor are connected with two of the rotating pieces respectively, and the input end of the speed change mechanism is connected with the planet carrier. According to the driving assembly for the tractor, the first driving motor is matched with the engine, so that when the road condition changes, namely the torque of the engine needs to be changed, the rotating speed of the output transmission shaft is always controlled to be unchanged through the torque output by the first driving motor, and it is guaranteed that the tractor can work normally under any road condition; therefore, the working effect and the working efficiency are ensured.

Description

[0001] This application claims the priority of the patent application with the application number 202411274311.7 (the filing date of the prior application is September 12, 2024, and the invention title is Drive Assembly for Tractor and Tractor). Technical Field

[0002] This application relates to the technical field of agricultural machinery, and particularly relates to a drive assembly for a tractor and a tractor. Background Art

[0003] The types of tractor hydraulic systems include fixed-displacement systems, fixed-variable compound systems, and variable-displacement systems. Among them, the variable-displacement system is mostly a hydraulically controlled load-sensing system, which realizes energy-saving control of pressure and flow through the load-sensing valve on the variable pump. After the variable pump supplies pressure oil to the steering priority valve, it first ensures the steering system, and the remaining pressure oil is delivered to the valve-controlled system. There is a fixed pressure difference between the output pressure of the variable pump of the hydraulically controlled load-sensing system and the pressure required by the steering system and / or the valve-controlled system, resulting in certain energy losses in the system. The greater the flow rate, the more energy losses; this control method is not only complex, but also sensitive to the pollution of hydraulic oil. At the same time, the cooperation method of using this variable pump and fixed-displacement motor has a high structural cost. Summary of the Invention

[0004] In order to solve the above technical problems, this application provides a drive assembly for a tractor and a tractor.

[0005] In a first aspect, this application provides a drive assembly for a tractor, including an engine, a first drive motor, a transmission mechanism, an output transmission shaft, and a first planetary gear set;

[0006] The first planetary gear set includes three coaxially arranged rotating members, which are a sun gear, a planet carrier, and a ring gear respectively; the engine and the first drive motor are respectively connected to two of the rotating members, the input end of the transmission mechanism is connected to the planet carrier, and the output end of the transmission mechanism is connected to the output transmission shaft;

[0007] It further includes a generator, and the generator is connected to the rotating member connected to the input end of the transmission mechanism, or the generator is connected to the rotating member connected to the engine.

[0008] Optionally, the planet carrier includes a carrier body and a first planetary gear group, where the first planetary gear group includes a first planetary gear installed on the carrier body, and the first planetary gear meshes with the sun gear and the ring gear;

[0009] The planet carrier further includes a second planet gear set. The input end of the speed change mechanism includes an input ring gear and an input sun gear. The second planet gear set includes second planet gears mounted on the frame body, and the second planet gears are respectively meshed with the input ring gear and the input sun gear.

[0010] Optionally, a first gear set is further included. The engine is connected to the driving gear in the first gear set, and the driven gear in the first gear set is connected to one of the rotating members in the first planetary gear set.

[0011] Optionally, the generator is connected to the driving gear in the first gear set.

[0012] Optionally, the first driving motor is coaxially arranged with the driven gear in the first gear set.

[0013] Optionally, the driven gear in the first gear set is connected to the ring gear in the first planetary gear set, the first driving motor is connected to the sun gear in the first planetary gear set, and the planet carrier in the first planetary gear set is connected to the input end of the speed change mechanism.

[0014] Optionally, the engine, the first driving motor and the generator are coaxially arranged.

[0015] Optionally, the first driving motor is coaxially sleeved outside the generator.

[0016] Optionally, the engine is connected to the planet carrier of the first planetary gear set, the generator is connected to the sun gear of the first planetary gear set, and the first driving motor is connected to the ring gear of the first planetary gear set.

[0017] Optionally, a second driving motor is further included. The output end of the speed change mechanism is connected to the output transmission shaft through the second driving motor.

[0018] In a second aspect, the present application provides a tractor, including the driving assembly as described above.

[0019] The technical solution provided by the embodiments of the present application has the following advantages compared with the prior art:

[0020] The drive assembly for a tractor provided by this application can utilize the cooperation of the first drive motor and the engine, so as to achieve that when the road surface condition changes, that is, when the engine needs to change the torque, the torque output by the first drive motor is used to always control the rotation speed of the output transmission shaft to remain unchanged, ensuring that the tractor can move forward at a constant speed under any road surface condition (when encountering different road resistances), guaranteeing the working effect and working efficiency; moreover, using the first drive motor to replace the variable pump and the fixed-displacement motor, the structure is simpler, the control method is also simpler, the cost is lower, and the engine can be speed-regulated by the generator, with accurate speed regulation and a large speed regulation range, ensuring that the engine always operates in the high-efficiency range, with lower fuel consumption and more energy-saving. Brief Description of the Drawings

[0021] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with this application, and are used together with the specification to explain the principles of this application.

[0022] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the drive assembly for a tractor according to the first embodiment of this application;

[0024] Figure 2 It is a schematic structural diagram of the drive assembly for a tractor according to the second embodiment of this application;

[0025] Figure 3 It is a schematic structural diagram of the drive assembly for a tractor according to the third embodiment of this application;

[0026] Figure 4 It is a schematic structural diagram of the drive assembly for a tractor according to the fourth embodiment of this application.

[0027] Among them, 11, engine; 121, first drive motor; 122, second drive motor; 13, generator; 211, sun gear; 212, planet carrier; 2121, first planet gear; 2122, second planet gear; 213, ring gear; 214, input ring gear; 215, input sun gear; 3, output transmission shaft; 41, first gear set. Detailed Description of the Embodiments

[0028] In order to more clearly understand the above-mentioned objects, features, and advantages of the present application, the solution of the present application will be further described below. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0029] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present application, rather than all the embodiments.

[0030] The types of tractor hydraulic systems include fixed-displacement systems, fixed-displacement variable compound systems, and variable-displacement systems. Among them, the variable-displacement system is mostly a hydraulically controlled load-sensing system, which realizes energy-saving control of pressure and flow through the load-sensing valve on the variable pump. After the variable pump supplies pressure oil to the steering priority valve, the steering system is preferentially ensured, and the remaining pressure oil is delivered to the valve control system. There is a fixed pressure difference between the output pressure of the variable pump of the hydraulically controlled load-sensing system and the pressure required by the steering system and / or the valve control system, resulting in certain energy losses in the system. The greater the flow rate, the more energy losses; this control method is not only complex, but also sensitive to the pollution of hydraulic oil. At the same time, the matching method of using this variable pump and fixed-displacement motor has a high structural cost.

[0031] Based on this, this embodiment provides a drive assembly for a tractor and a tractor, which can utilize the cooperation of the first drive motor and the engine, so as to realize that when the road surface condition changes, that is, when the engine 11 needs to change the torque, the torque output by the first drive motor is used to always control the rotational speed of the output transmission shaft to be unchanged, ensuring that the tractor can always move forward at a constant speed under any road surface conditions (when encountering different road resistances), ensuring the working effect and working efficiency; moreover, using the first drive motor to replace the variable pump and the fixed-displacement motor, the structure is simpler, the control method is also simpler, the cost is lower, and the engine can be speed-regulated through the generator, with accurate speed regulation and a large speed regulation range, ensuring that the engine always works in the high-efficiency range, with lower fuel consumption and more energy-saving. The following will be described in detail through specific embodiments:

[0032] Refer to Figures 1 to 4As shown in the figure, a drive assembly for a tractor provided in this embodiment includes an engine 11, a first drive motor 121, a speed change mechanism, an output transmission shaft 3, and a first planetary gear set; the first planetary gear set includes three rotating members arranged coaxially, and the three rotating members are a sun gear 211, a planet carrier 212, and a ring gear 213 respectively; the engine 11 and the first drive motor 121 are respectively connected to two of the rotating members, the input end of the speed change mechanism is connected to the remaining one rotating member, and the output end of the speed change mechanism is connected to the output transmission shaft 3; it further includes a generator 13, and the generator 13 is connected to the rotating member connected to the input end of the speed change mechanism, or the generator 13 is connected to the rotating member connected to the engine 11.

[0033] The drive assembly for a tractor provided in this embodiment can utilize the cooperation of the first drive motor 121 and the engine 11, so as to realize that when the road surface condition changes, that is, when the engine 11 needs to change the torque, the torque output by the first drive motor 121 is used to always control the rotation speed of the output transmission shaft 3 to be unchanged, ensuring that the tractor can always move forward at a constant speed under any road surface condition (when encountering different road surface resistances), ensuring the working effect and working efficiency; moreover, using the first drive motor 121 to replace the variable pump and the fixed-displacement motor, the structure is simpler, the control method is also simpler, the cost is lower, and the engine 11 can be speed-regulated by the generator 13, with accurate speed regulation and a large speed regulation range, ensuring that the engine 11 always works in the high-efficiency range, with lower fuel consumption and more energy-saving.

[0034] In an embodiment of the present application, the engine 11 and the first drive motor 121 are respectively connected to two of the rotating members, and the input end of the speed change mechanism is connected to the planet carrier 212.

[0035] Optionally, the above-mentioned planet carrier 212 includes a carrier body and a first planetary gear set, wherein the first planetary gear set includes a first planetary gear 2121 mounted on the carrier body of the planet carrier 212, and the first planetary gear 2121 meshes with the above-mentioned sun gear 211 and ring gear 213. Optionally, the first planetary gear 2121 can be provided with a plurality of them, which are evenly distributed on the carrier body of the planet carrier 212.

[0036] The input end of the above-mentioned speed change mechanism includes an input ring gear 214 and an input sun gear 215. The above-mentioned planet carrier 212 further includes a second planetary gear set, and the second planetary gear set includes a second planetary gear 2122 mounted on the carrier body of the planet carrier 212. The second planetary gear 2122 meshes with the above-mentioned input ring gear 214 and input sun gear 215 respectively, so as to realize that when the engine 11 and the first drive motor 121 are respectively connected to two of the rotating members, the input end of the speed change mechanism is connected to the planet carrier 212.

[0037] In this embodiment, the planet carrier 212 is connected to the sun gear 211, the ring gear 213, the input ring gear 214, and the input sun gear 215 simultaneously, achieving the transmission of power by one planet carrier 212 and effectively reducing the volume of the drive assembly in this embodiment.

[0038] In some embodiments, with continued reference to Figure 1 as shown, the drive assembly further includes a first gear set 41. The engine 11 is connected to the driving gear in the first gear set 41, and the driven gear in the first gear set 41 is connected to one of the rotating members in the first planetary gear set. Through the arrangement of the first gear set 41, the torque and speed output by the engine 11 can be variated for the first time. Moreover, through the arrangement of the first gear set 41, the drive assembly can be applied to tractors of different models by adjusting the transmission ratio between the driving gear and the driven gear.

[0039] In a further embodiment, the generator 13 is connected to the driving gear in the first gear set 41. By connecting the generator 13 to the driving gear, the generator 13 can be used to directly adjust the speed of the engine 11, so that the engine 11 always remains in the efficient range, thereby improving the efficiency of the entire drive assembly.

[0040] In some embodiments, the first drive motor 121 is coaxially arranged with the driven gear in the first gear set 41. With this arrangement, the first drive motor 121 can be arranged side by side with the engine 11, thereby shortening the axial dimension of the entire drive assembly and facilitating the layout work of the drive assembly.

[0041] With continued reference to Figure 1 as shown, the driven gear in the first gear set 41 is connected to the ring gear 213 in the first planetary gear set, the first drive motor 121 is connected to the sun gear 211 in the first planetary gear set, and the planet carrier 212 in the first planetary gear set is connected to the input end of the transmission mechanism. Specifically, the second planetary gear 2122 on the planet carrier 212 is respectively connected to the input ring gear 214 and the input sun gear 215.

[0042] With continued reference to Figures 2 to 4 as shown, the engine 11, the first drive motor 121, and the generator 13 are coaxially arranged, thereby effectively reducing the radial dimension of the entire drive assembly and facilitating the layout work of the drive assembly.

[0043] With continued reference to Figure 3 as shown, the first drive motor 121 is coaxially sleeved outside the generator 13. In some other embodiments, the generator 13 can also be coaxially sleeved outside the first drive motor 121, as long as the axial space of the entire drive assembly can be further shortened.

[0044] In some embodiments, the engine 11 is connected to the planet carrier 212 of the first planetary gear set, the generator 13 is connected to the sun gear 211 of the first planetary gear set, and the first drive motor 121 is connected to the ring gear 213 of the first planetary gear set. The input ring gear 214 and the input sun gear 215 are both connected to the second planet gear 2122 on the planet carrier 212.

[0045] Continuing to refer to Figure 4 As shown, the drive assembly further includes a second drive motor 122. The output end of the transmission mechanism is connected to the output transmission shaft 3 through the second drive motor 122. By arranging the second drive motor 122 at the output transmission shaft 3, when the vehicle is operating under harsh working conditions (with large load changes), it can be used to stably output torque, so that the vehicle always remains in a stable state, providing reliability and comfort.

[0046] In a second aspect, the present application provides a tractor, including the drive assembly as described above; since this tractor includes the drive assembly as described above, it also has the advantages of the drive assembly as described above. That is to say, when the road surface condition changes, that is, when the engine needs to change torque, the torque output by the first drive motor 121 is used to always control the rotational speed of the output transmission shaft 3 to remain unchanged, ensuring that the tractor can always move forward at a constant speed under any road surface condition (when encountering different road surface resistances), ensuring the working effect and working efficiency; moreover, using the first drive motor 121 to replace the variable pump and the fixed-displacement motor, the structure is simpler, the control method is also simpler, the cost is lower, and the engine 11 can be speed-regulated through the generator 13, with accurate speed regulation and a large speed regulation range, ensuring that the engine 11 always operates in the high-efficiency range, with lower fuel consumption and more energy-saving.

[0047] The specific implementation method and implementation principle are the same as those of the above embodiments, and can bring the same or similar technical effects, which will not be elaborated one by one here. Specifically, reference can be made to the description of the drive assembly embodiment for the tractor above.

[0048] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0049] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments described herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drive assembly for a tractor, characterized in that: It comprises an engine (11), a first drive motor (121), a speed change mechanism, an output transmission shaft (3) and a first planetary gear; The first planetary gear comprises three coaxially arranged rotating parts, the three rotating parts being respectively a sun gear (211), a planet carrier (212) and a ring gear (213); the engine (11) and the first drive motor (121) are respectively connected to two of the rotating parts, the input end of the speed change mechanism is connected to the planet carrier (212), and the output end of the speed change mechanism is connected to the output transmission shaft (3); It also includes a generator (13), the generator (13) is connected to the rotating member connected to the input end of the speed change mechanism, or the generator (13) is connected to the rotating member connected to the engine (11).

2. The drive assembly for a tractor according to claim 1, characterized in that: The planet carrier (212) comprises a carrier body and a first planetary gear set, wherein the first planetary gear set comprises a first planetary gear (2121) mounted on the carrier body, and the first planetary gear (2121) is meshed with the sun gear (211) and the ring gear (213); The planet carrier (212) also includes a second planetary gear set, the input end of the speed change mechanism includes an input ring gear (214) and an input sun gear (215), the second planetary gear set includes a second planetary gear (2122) mounted on the carrier, and the second planetary gear (2122) is respectively meshed with the input ring gear (214) and the input sun gear (215).

3. The drive assembly for a tractor according to claim 1, characterized in that: It also includes a first gear set (41), the engine (11) is connected to the driving gear in the first gear set (41), and the driven gear in the first gear set (41) is connected to one of the rotating parts in the first planetary gear set.

4. The drive assembly for a tractor according to claim 3, characterized in that: The generator (13) is connected to the driving gear in the first gear set (41).

5. The drive assembly for a tractor according to claim 4, characterized in that: The first driving motor (121) is coaxially arranged with the driven gear in the first gear set (41).

6. The drive assembly for a tractor according to claim 5, characterized in that: The driven gear in the first gear set (41) is connected to the ring gear (213) in the first planetary gear set, the first drive motor (121) is connected to the sun gear (211) in the first planetary gear set, and the planet carrier (212) in the first planetary gear set is connected to the input end of the speed change mechanism.

7. The drive assembly for a tractor according to claim 1, characterized in that: The engine (11), the first drive motor (121) and the generator (13) are coaxially arranged.

8. The drive assembly for a tractor according to claim 7, characterized in that: The engine (11) is connected to the planet carrier (212) of the first planetary gear set, the generator (13) is connected to the sun gear (211) of the first planetary gear set, and the first drive motor (121) is connected to the ring gear (213) of the first planetary gear set.

9. The drive assembly for a tractor according to claim 1, characterized in that: It also includes a second drive motor (122), and the output end of the speed change mechanism is connected to the output transmission shaft (3) through the second drive motor (122).

10. A tractor, characterized in that: Comprising a drive assembly as claimed in any one of claims 1 to 9.

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