Drive assembly for a tractor and tractor

Abstract

The application 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 planetary gear train; the first planetary gear train comprises three coaxially arranged rotating members, the three rotating members are respectively a sun gear, a planet carrier and a ring gear; the engine and the first driving motor are connected with two rotating members respectively, and the input end of the speed change mechanism is connected with the planet carrier. The driving assembly for the tractor can utilize the cooperation of the first driving motor and the engine, so that the rotating speed of the output transmission shaft is always controlled to be unchanged by utilizing the torque output by the first driving motor when the road surface condition changes, that is, the torque of the engine needs to be changed, the tractor can always move at a constant speed under any road surface condition, and the working effect and the working efficiency are ensured.

Description

[0001] The present application claims priority to patent application No. 202411274311.7 (the filing date of the prior application is September 12, 2024, and the invention name is a driving assembly for a tractor and a tractor). TECHNICAL FIELD

[0002] The present application relates to the technical field of agricultural machinery, in particular to a driving assembly for a tractor and a tractor. BACKGROUND

[0003] The types of tractor hydraulic systems include constant flow systems, constant flow variable composite systems and variable systems. Among them, the variable system is mostly a load-sensitive system of the hydraulic control type, which realizes energy-saving control of pressure and flow through the load-sensitive valve on the variable pump. The system supplies pressure oil to the steering priority valve through the variable pump, and preferentially guarantees the steering system, and the remaining pressure oil is delivered to the valve control system. The variable pump of the load-sensitive system of the hydraulic control type has a fixed pressure difference with the pressure required by the steering system and / or the valve control system, resulting in a certain energy loss of the system, and the greater the flow, the more energy loss. This control method is not only complex, but also sensitive to hydraulic oil pollution, and the structure cost of using such a variable pump and constant flow motor is high. SUMMARY

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

[0005] In a first aspect, the present application provides a driving assembly for a tractor, comprising an engine, a first driving motor, a speed change mechanism, an output transmission shaft and a first planetary gear set;

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

[0007] Further comprising a generator, the generator is connected with the rotating member connected with the input end of the speed change mechanism, or the generator is connected with the rotating member connected with the engine.

[0008] Optionally, the planet carrier comprises a carrier body and a first planetary gear set, wherein the first planetary gear set comprises a first planetary gear mounted on the carrier body, and the first planetary gear is engaged with the sun gear and the ring gear;

[0009] The planet carrier further comprises a second planetary gear set, the input end of the gear shift mechanism comprises an input ring gear and an input sun gear, and the second planetary gear set comprises second planetary gears mounted on the carrier body and engaged with the input ring gear and the input sun gear respectively.

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

[0011] Optionally, the generator is connected with 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 with the ring gear in the first planetary gear set, the first driving motor is connected with the sun gear in the first planetary gear set, and the planet carrier in the first planetary gear set is connected with the input end of the gear shift mechanism.

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

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

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

[0017] Optionally, a second driving motor is further included, and the output end of the gear shift mechanism is connected with the output transmission shaft through the second driving motor.

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

[0019] Compared with the prior art, the technical scheme provided by the embodiments of the application has the following advantages:

[0020] The driving assembly for the tractor provided in the application can utilize the first driving motor and the engine to cooperate, so that when the road surface condition changes, that is, when the engine needs to change the torque, the torque output by the first driving motor is utilized to always control the rotation speed of the output transmission shaft unchanged, so that the tractor can always advance at a uniform speed under any road surface condition (when different road surface resistances are encountered), and the working effect and working efficiency are ensured; moreover, the first driving motor is used to replace the variable pump and the fixed displacement motor, the structure is simpler, the control mode is simpler, the cost is lower, and the engine can be speed-regulated through the generator, the speed regulation is accurate, the speed regulation range is large, the engine can always work in the efficient range, the fuel consumption is lower, and the energy saving is better. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the application and, together with the specification, serve to explain the principles of the application.

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0023] Figure 1 The structural schematic diagram of the driving assembly for the tractor according to the first embodiment of the application;

[0024] Figure 2 The structural schematic diagram of the driving assembly for the tractor according to the second embodiment of the application;

[0025] Figure 3 The structural schematic diagram of the driving assembly for the tractor according to the third embodiment of the application;

[0026] Figure 4 The structural schematic diagram of the driving assembly for the tractor according to the fourth embodiment of the application.

[0027] Wherein, 11, engine; 121, first driving motor; 122, second driving motor; 13, generator; 211, sun gear; 212, planetary carrier; 2121, first planetary gear; 2122, second planetary gear; 213, ring gear; 214, input ring gear; 215, input sun gear; 3, output transmission shaft; 41, first gear set. DETAILED DESCRIPTION

[0028] In order to enable a more clear understanding of the above-mentioned objects, features and advantages of the present application, the following will further describe the solutions of the present application. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0029] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other manners different from those described herein; obviously, the embodiments described in the specification are only a part of the embodiments of the present application, and not all the embodiments.

[0030] The tractor hydraulic system types include a constant flow system, a constant flow variable composite system and a variable system. Among them, the variable system is mostly a load-sensitive system of the hydraulic control type, and the energy-saving control of pressure and flow is realized through the load-sensitive valve on the variable pump. The system supplies pressure oil to the steering priority valve through the variable pump, and preferentially guarantees the steering system, and the remaining pressure oil is delivered to the valve control system. The variable pump of the load-sensitive system of the hydraulic control type has a fixed pressure difference with the required pressure of the steering system and / or the valve control system, which causes a certain energy loss of the system, and the greater the flow, the more the energy loss; such control mode is not only complex, but also sensitive to the pollution of hydraulic oil, and the cooperation mode of the variable pump and the constant flow motor has high structural cost.

[0031] Based on this, the embodiment provides a driving assembly for a tractor and a tractor, which can utilize the cooperation of the first driving motor and the engine, so that when the road surface condition changes, that is, the engine 11 needs to change the torque, the torque output by the first driving motor is utilized to control the rotation speed of the output transmission shaft unchanged, so as to ensure that the tractor can always move at a constant speed under any road surface condition (when encountering different road surface resistances), and ensure the working effect and working efficiency; moreover, the first driving motor is used to replace the variable pump and the constant flow motor, the structure is simpler, the control mode is simpler, the cost is lower, the engine can be speed-regulated through the generator, the speed regulation is accurate, the speed regulation range is large, the engine can always work in the efficient range, the fuel consumption is lower, and the energy saving is better. The following will be described in detail through specific embodiments:

[0032] Reference Figures 1 to 4As shown, the driving assembly for tractor provided by the embodiment comprises an engine 11, a first driving motor 121, a speed change mechanism, an output transmission shaft 3 and a first planetary gear train; the first planetary gear train comprises three coaxial rotating members, which are a sun gear 211, a planet carrier 212 and a ring gear 213; the engine 11 and the first driving motor 121 are connected with two rotating members respectively, the input end of the speed change mechanism is connected with the remaining rotating member, and the output end of the speed change mechanism is connected with the output transmission shaft 3; further comprising a generator 13, which is connected with the rotating member connected with the input end of the speed change mechanism or the rotating member connected with the engine 11.

[0033] The driving assembly for tractor provided by the embodiment can cooperate with the first driving motor 121 and the engine 11, so that when the road surface condition changes, that is, the engine 11 needs to change the torque, the rotational speed of the output transmission shaft 3 is always controlled to be unchanged by using the torque output by the first driving motor 121, so that the tractor can always move at a constant speed under any road surface condition (when encountering different road surface resistances), and the working effect and working efficiency are ensured; moreover, the first driving motor 121 is used to replace the variable pump and the fixed displacement motor, the structure is simpler, the control mode is simpler, the cost is lower, and the engine 11 can be speed-regulated by the generator 13, the speed regulation is accurate, the speed regulation range is large, the engine 11 can always work in the efficient range, the fuel consumption is lower, and the tractor is more energy-saving.

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

[0035] Optionally, 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 of the planet carrier 212, and the first planetary gear 2121 is engaged with the sun gear 211 and the ring gear 213; optionally, the first planetary gear 2121 can be provided as a plurality of first planetary gears which are uniformly distributed on the carrier body of the planet carrier 212.

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

[0037] In the embodiment, the planet carrier 212 is connected with the sun gear 211, the ring gear 213, the input ring gear 214 and the input sun gear 215, so that the power is transmitted by the planet carrier 212, and the volume of the driving assembly is effectively reduced.

[0038] In some embodiments, continuing to refer to Figure 1 The driving assembly further comprises a first gear set 41, the engine 11 is connected with a driving gear in the first gear set 41, and a driven gear in the first gear set 41 is connected with one of the rotating members in the first planetary gear set; by the first gear set 41, the torque and the rotating speed output by the engine 11 can be first changed; and by the first gear set 41, the driving assembly can be applied to different types of tractors by adjusting the transmission ratio of the driving gear and the driven gear.

[0039] In further embodiments, the generator 13 is connected with the driving gear in the first gear set 41; by connecting the generator 13 with the driving gear, the generator 13 can be used to directly adjust the rotating speed of the engine 11, so that the engine 11 is always kept in the high-efficiency range, and the efficiency of the entire driving assembly is improved.

[0040] In some embodiments, the first driving motor 121 is coaxially arranged with the driven gear in the first gear set 41; in this way, the first driving motor 121 can be arranged side by side with the engine 11, so that the axial dimension of the entire driving assembly is shortened, and the arrangement of the driving assembly is facilitated.

[0041] Continuing to refer to Figure 1 The driven gear in the first gear set 41 is connected with the ring gear 213 in the first planetary gear set, the first driving motor 121 is connected with the sun gear 211 in the first planetary gear set, and the planet carrier 212 in the first planetary gear set is connected with the input end of the speed change mechanism, specifically, the second planetary gears 2122 on the planet carrier 212 are respectively connected with the input ring gear 214 and the input sun gear 215.

[0042] Continuing to refer to Figures 2 to 4 The engine 11, the first driving motor 121 and the generator 13 are coaxially arranged, so that the radial dimension of the entire driving assembly is effectively reduced, and the arrangement of the driving assembly is facilitated.

[0043] Continuing to refer to Figure 3 The first driving motor 121 is coaxially arranged outside the generator 13; in other embodiments, the generator 13 can also be coaxially arranged outside the first driving motor 121, as long as the axial space of the entire driving assembly can be further shortened.

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

[0045] With reference to the accompanying drawings, the drive assembly is described in detail. Figure 4 As shown, the drive assembly further comprises a second drive motor 122, and the output end of the transmission mechanism is connected with the output transmission shaft 3 through the second drive motor 122. By arranging the second drive motor 122 at the output transmission shaft 3, the vehicle can work in harsh conditions (with large load changes), so as to stabilize the output torque and keep the vehicle in a stable state, thereby providing reliability and comfort.

[0046] In a second aspect, the application provides a tractor comprising the drive assembly as described above. Since the tractor comprises the drive assembly as described above, the tractor also has the advantages of the drive assembly as described above, that is, when the road conditions change, that is, when the engine needs to change the torque, the first drive motor 121 is used to output the torque to control the speed of the output transmission shaft 3 to be constant, so as to ensure that the tractor can always move at a constant speed under any road conditions (when encountering different road resistances), thereby ensuring the working effect and efficiency. Moreover, the first drive motor 121 is used to replace the variable pump and the fixed displacement motor, so that the structure is simpler, the control mode is simpler, the cost is lower, the engine 11 can be speed-regulated through the generator 13, the speed regulation is accurate, the speed regulation range is large, the engine 11 can always work in the high-efficiency range, the fuel consumption is lower, and the tractor is more energy-saving.

[0047] The specific implementation and implementation principles are the same as those of the above-described embodiments and can bring the same or similar technical effects. Details can be referred to the description of the above-described drive assembly for a tractor.

[0048] It should be noted that, in this document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement“comprising a……” does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0049] The foregoing detailed description of the application has been presented for purposes of illustration and description. Various modifications and changes can be made to these embodiments without departing from the spirit and scope of the application. It is intended that the scope of the application should not be limited by the particular representative embodiments described above. Rather, the general scope of the application is to be determined by the appended claims and their equivalents.

Claims

1. A drive assembly for a tractor, characterized in that, The drive assembly comprises an engine (11), a first driving motor (121), a transmission mechanism, an output transmission shaft (3) and a first planetary gear train; The first planetary gear train comprises three coaxial rotating members, which are a sun gear (211), a planet carrier (212) and a ring gear (213) respectively; the engine (11) and the first driving motor (121) are connected with two rotating members respectively, the input end of the transmission mechanism is connected with the planet carrier (212), and the output end of the transmission mechanism is connected with the output transmission shaft (3); The drive assembly further comprises a generator (13), which is connected with the rotating member connected with the input end of the transmission mechanism or the rotating member connected with the engine (11); 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 engaged with the sun gear (211) and the ring gear (213); The planet carrier (212) further comprises a second planetary gear set, the input end of the transmission mechanism comprises an input ring gear (214) and an input sun gear (215), and the second planetary gear set comprises a second planetary gear (2122) mounted on the carrier body, and the second planetary gear (2122) is engaged with the input ring gear (214) and the input sun gear (215) respectively; The drive assembly further comprises a first gear set (41), the engine (11) is connected with a driving gear in the first gear set (41), and a driven gear in the first gear set (41) is connected with one of the rotating members in the first planetary gear train.

2. The drive assembly for a tractor of claim 1, wherein, The generator (13) is connected with a driving gear in the first gear set (41).

3. The drive assembly for a tractor of claim 2, wherein, The first driving motor (121) is coaxially arranged with a driven gear in the first gear set (41).

4. The drive assembly for a tractor of claim 3, wherein, The driven gear in the first gear set (41) is connected with the ring gear (213) in the first planetary gear train, the first driving motor (121) is connected with the sun gear (211) in the first planetary gear train, and the planet carrier (212) in the first planetary gear train is connected with the input end of the transmission mechanism.

5. The drive assembly for a tractor of claim 1, wherein, The engine (11), the first driving motor (121) and the generator (13) are coaxially arranged.

6. The drive assembly for a tractor of claim 5, wherein, The engine (11) is connected with the planet carrier (212) of the first planetary gear train, the generator (13) is connected with the sun gear (211) of the first planetary gear train, and the first driving motor (121) is connected with the ring gear (213) of the first planetary gear train.

7. The drive assembly for a tractor of claim 1, wherein, The drive assembly further comprises a second driving motor (122), and the output end of the transmission mechanism is connected with the output transmission shaft (3) through the second driving motor (122).

8. A tractor characterised in that The drive assembly comprises the driving assembly according to any one of claims 1 to 7.

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