Hybrid power gear shifting transmission system and articulated tractor

Abstract

The utility model relates to the technical field of agricultural mechanical equipment, in particular to a hybrid power gear shifting transmission system and an articulated tractor. The hybrid power gear shifting transmission system comprises a working pump set, an engine, a generator, a main drive motor and a power gear shifting gearbox. The engine is connected with the generator and drives the generator to generate electricity; the engine is connected with the working pump set and drives the working pump set to work. The generator is electrically connected with the main drive motor and supplies power to the main drive motor; the power gear shifting gearbox comprises an input shaft assembly and an output shaft assembly which are in transmission connection, and the main drive motor is connected with the input shaft assembly to drive the output shaft assembly. An articulated tractor includes a hybrid power shift drivetrain. According to the hybrid power gear-shifting transmission system and the articulated tractor, decoupling between the rotating speed of the engine and the power gear-shifting gearbox is achieved, when the load of the power gear-shifting gearbox changes, only the power of a main drive motor needs to be adjusted, the rotating speed of the engine is not affected, and the flow of a working pump set does not fluctuate.

Description

Technical Field

[0001] The present application relates to the technical field of agricultural machinery and equipment, and in particular to a hybrid power shift transmission system and an articulated tractor. Background Art

[0002] Currently, medium and large horsepower tractors, especially medium and large horsepower articulated tractors, basically use engines and gearboxes to achieve power output.

[0003] The gearbox includes the currently used power shift box and CVT continuously variable transmission box. Because the tractor operating conditions are diverse and the operating speeds corresponding to different typical operating conditions are also quite different, it is necessary to frequently shift gears to change the gearbox ratio in order to keep the engine at a relatively economical and efficient speed.

[0004] In order to meet the above-mentioned multi-operating conditions, the power shift box is generally configured with more than a dozen forward gears. However, since the wet clutch used in the power shift box has strict requirements on the use conditions, the number of clutches is large, and the shifting strategy is complex, the design, control and manufacturing of the gearbox are accordingly very complex and difficult to implement.

[0005] Although the CVT continuously variable transmission has a lower number of gears than the power transmission, the design and control of its high-pressure and efficient pump motor and planetary coupling are difficult and have not yet been fully applied. In addition, since the working pump is usually directly connected to the engine or indirectly connected to the engine through a gearbox, when the engine speed fluctuates due to changes in gear or power output load, the flow of the working pump will also fluctuate, thus affecting the operating quality of the tractor. Utility Model Content

[0006] The purpose of the present application is to provide a hybrid power shift transmission system and an articulated tractor, so as to solve the technical problems existing in the prior art to a certain extent, such as the large number of gears, the large number of clutches, and the engine speed being easily fluctuated due to the working conditions.

[0007] The present application provides a hybrid power shift transmission system, including a working pump group, an engine, a generator, a main drive motor and a power shift transmission;

[0008] The engine is connected to the generator and can drive the generator to generate electricity;

[0009] The engine is connected to the working pump group and can drive the working pump group to work;

[0010] The generator is electrically connected to the main drive motor and can supply power to the main drive motor;

[0011] The power shift transmission includes an input shaft assembly and an output shaft assembly, wherein the output shaft assembly is drivingly connected to the input shaft assembly, and the main drive motor is connected to the input shaft assembly to drive the output shaft assembly.

[0012] In the above technical solution, further, the hybrid power shift transmission system also includes an energy storage unit, and the energy storage unit is electrically connected to the generator and the main drive motor.

[0013] In any of the above technical solutions, further, the hybrid power shift transmission system also includes a first control unit, a second control unit and a third control unit;

[0014] The generator and the main drive motor are electrically connected via the first control unit, the second control unit and the third control unit in sequence, and the second control unit is electrically connected to the energy storage unit;

[0015] When the load of the main drive motor increases, the second control unit and the third control unit first control the energy storage unit and the generator to jointly supply power to the main drive motor for a predetermined period of time, so as to compensate for the response delay of the first control unit in controlling the generator to the load.

[0016] In any of the above technical solutions, further, the power shift transmission also includes a first intermediate shaft assembly, a second intermediate shaft assembly and a third intermediate shaft assembly;

[0017] The input shaft assembly and the output shaft assembly are transmission-connected via the first intermediate shaft assembly, the second intermediate shaft assembly and the third intermediate shaft assembly;

[0018] The first intermediate shaft assembly and the second intermediate shaft assembly each include a clutch, and the third intermediate shaft assembly includes two clutches.

[0019] In any of the above technical solutions, further, the input shaft assembly includes an input shaft and a first gear, the first gear is connected to the input shaft, and the main drive motor is connected to the input shaft;

[0020] The hybrid power shift transmission system further includes a first clutch, a second gear, a third gear and a PTO, the input shaft is connected to the second gear via the first clutch, the third gear is meshed with the second gear, and the PTO is connected to the third gear.

[0021] In any of the above technical solutions, further, the first intermediate shaft assembly includes a first intermediate shaft, a fourth gear and a fifth gear, and the clutch of the first intermediate shaft assembly is a second clutch;

[0022] The fourth gear is connected to the first intermediate shaft and meshes with the first gear, and the fourth gear is connected to the fifth gear through the second clutch.

[0023] In any of the above technical solutions, further, the second intermediate shaft assembly includes a second intermediate shaft, a sixth gear, a seventh gear, an eighth gear and a ninth gear, and the clutch of the second intermediate shaft assembly is a third clutch;

[0024] The sixth gear is connected to the second intermediate shaft and meshes with the fourth gear. The sixth gear is connected to the seventh gear and the eighth gear through the third clutch. The ninth gear is connected to the second intermediate shaft.

[0025] In any of the above technical solutions, further, the third intermediate shaft assembly includes a third intermediate shaft, a tenth gear, an eleventh gear and a twelfth gear, and the clutch of the third intermediate shaft assembly includes a fourth clutch and a fifth clutch;

[0026] The third intermediate shaft is connected to the tenth gear through the fourth clutch, and the tenth gear is meshed with the ninth gear;

[0027] The third intermediate shaft is connected to the eleventh gear through the fifth clutch, and the eleventh gear is meshed with the sixth gear;

[0028] The twelfth gear is connected to the third intermediate shaft, and the twelfth gear is meshed with the eighth gear.

[0029] In any of the above technical solutions, further, the output shaft assembly includes an output shaft and a thirteenth gear, the thirteenth gear is connected to the output shaft, and the thirteenth gear is meshed with the twelfth gear;

[0030] The output shaft assembly also includes a normally closed clutch, and the normally closed clutch is connected to the output shaft.

[0031] The present application also provides an articulated tractor, comprising the hybrid power shift transmission system described in any of the above technical solutions.

[0032] Compared with the prior art, the beneficial effects of this application are:

[0033] The hybrid power shift transmission system provided in the present application drives the power shift transmission gearbox through the main drive motor, supplies power to the main drive motor through the cooperation of the generator and the engine, and the engine directly drives the working pump group.

[0034] The hybrid power shift transmission system realizes the decoupling between the engine speed and the power shift transmission. When the load of the power shift transmission changes, the power of the main drive motor can be adjusted, and the engine speed is not affected. The fuel consumption is low, thereby stably driving the working pump group, and the flow of the working pump group will not fluctuate. Therefore, the flow of the working pump group is stable and changes little, which does not affect the operation quality of the tractor.

[0035] The articulated tractor provided in the present application includes the above-mentioned hybrid power shift transmission system, thereby being able to achieve all the beneficial effects of the hybrid power shift transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic diagram of the structure of a hybrid power shift transmission system provided in an embodiment of the present application.

[0038] Reference numerals:

[0039] 1-engine; 2-working pump group; 3-generator; 4-first control unit; 5-energy storage unit; 6-second control unit; 7-third control unit; 8-main drive motor; 9-transmission shaft; 10-first clutch; 11-third gear; 12-second gear; 130-input shaft assembly; 1301-input shaft; 1302-first gear; 132-first intermediate shaft assembly; 1320-fourth gear; 1321-first intermediate shaft; 1322-fifth gear; 1323-second clutch; 133-second intermediate shaft assembly; 1330-ninth gear; 1331-sixth gear; 1332-third clutch; 1333-second intermediate shaft; 1334-seventh gear; 1335-eighth gear; 134-third intermediate shaft assembly; 1340-tenth gear; 1341-fourth clutch; 1342-third intermediate shaft; 1343-fifth clutch; 1344-eleventh gear; 1345-twelfth gear; 135-output shaft assembly; 1350-thirteenth gear; 1351-output shaft; 1352-normally closed clutch. DETAILED DESCRIPTION

[0040] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Embodiment 1

[0044] See also Figure 1 As shown, an embodiment of the present application provides a hybrid power shift transmission system for an articulated tractor, and more specifically, can be used for a high-horsepower articulated tractor.

[0045] The hybrid power shift transmission system provided in this embodiment includes a working pump group 2, an engine 1, a generator 3, a main drive motor 8 and a power shift transmission gearbox.

[0046] The engine 1 is connected to the generator 3 and can drive the generator 3 to generate electricity.

[0047] The generator 3 is electrically connected to the main drive motor 8 and can supply power to the main drive motor 8 to provide electrical energy for the main drive motor 8 to operate.

[0048] The engine 1 is connected to the working pump group 2 and can drive the working pump group 2 to work, wherein the working pump group 2 includes a working pump and other pumps. The working pump is, for example, a hydraulic pump in a hydraulic system of an articulated tractor, and other pumps are, for example, control pumps of some valve bodies, lubricating liquid supply pumps or clutch control oil supply pumps, etc., which are not elaborated here.

[0049] The power shift transmission includes an input shaft assembly 130 and an output shaft assembly 135, the output shaft assembly 135 is drivingly connected to the input shaft assembly 130, and the main drive motor 8 is connected to the input shaft assembly 130 to drive the output shaft assembly 135. In other words, the power shift transmission is directly driven by the main drive motor 8, rather than being directly driven by the engine 1, the main drive motor 8 is powered by the engine 1 and the generator 3, and the working pump group 2 is driven by the engine 1.

[0050] The hybrid power shift transmission system realizes the decoupling between the speed of the engine 1 and the power shift transmission. When the load of the power shift transmission changes, the speed of the engine 1 is not affected, and the fuel consumption is low, thereby stably driving the working pump group 2, and the flow of the working pump group 2 will not fluctuate. Therefore, the flow of the working pump group 2 is stable and changes little, which does not affect the operation quality of the tractor.

[0051] In an optional solution of this embodiment, the hybrid power shift transmission system further includes an energy storage unit 5, which is electrically connected to the generator 3 and the main drive motor 8. Thus, the energy storage unit 5 can store the electric energy generated by the generator 3 and can supply electric energy to the main drive motor 8. In other words, the main drive motor 8 can be powered by both the energy storage unit 5 and the generator 3.

[0052] In this embodiment, the hybrid power shift transmission system further includes a first control unit 4 , a second control unit 6 and a third control unit 7 .

[0053] The generator 3 and the main drive motor 8 are electrically connected through the first control unit 4, the second control unit 6 and the third control unit 7 in sequence, and the second control unit 6 is electrically connected to the energy storage unit 5. The first control unit 4 is used to control the working state of the generator 3, the second control unit 6 is used to control the charging and discharging of the energy storage unit 5, and the third control unit 7 is used to control the working state of the main drive motor 8.

[0054] When the main drive motor 8 is idle, the first control unit 4 and the second control unit 6 can jointly control the generator 3 to supply power to the energy storage unit 5, so that the energy storage unit 5 can store electricity.

[0055] Generally, the load of the main drive motor 8 is stable, and the generator 3 directly supplies power to the main drive motor 8 .

[0056] When the load of the main drive motor 8 becomes smaller, the third control unit 7 controls the main drive motor 8 to use a part of the power supplied by the generator 3, and the second control unit 6 controls the energy storage unit 5 to store the rest of the power supplied by the generator 3. This ensures that the power generated by the generator 3 is fully utilized and avoids power waste.

[0057] When the load of the main drive motor 8 increases, the second control unit 6 and the third control unit 7 first control the energy storage unit 5 and the generator 3 to jointly supply power to the main drive motor 8 for a predetermined period of time to compensate for the response delay of the first control unit 4 to control the generator 3 to the load.

[0058] Specifically, when the load of the main drive motor 8 increases, the first control unit 4 cannot immediately control the generator 3 to adjust the power supply to match the current load of the main drive motor 8, so the generator 3 will respond in a delayed manner. During the delayed response period, the second control unit 6 and the third control unit 7 can first control the energy storage unit 5 to cooperate with the generator 3 to supply power to the main drive motor 8 for a predetermined period of time to fill the power supply gap during the delayed response period, so that the main drive motor 8 can immediately meet the greater load demand. Among them, the predetermined time is configured to be not less than the delayed response time.

[0059] It is worth explaining that the load change can meet the operation demand by the power change of the main drive motor 8, so the speed of the engine 1 is basically not affected.

[0060] Optionally, the first control unit 4 is a GCU (Generator Control Unit), the second control unit 6 is a PDU (Power Distribution Unit), and the third control unit 7 is an MCU (Motor Control Unit).

[0061] Optionally, the energy storage unit 5 is, for example, an energy storage battery box or a battery pack.

[0062] In an optional solution of this embodiment, the power shift transmission further includes a first intermediate shaft assembly 132 , a second intermediate shaft assembly 133 and a third intermediate shaft assembly 134 .

[0063] The input shaft assembly 130 and the output shaft assembly 135 are connected in transmission via the first intermediate shaft assembly 132 , the second intermediate shaft assembly 133 and the third intermediate shaft assembly 134 , that is, gear switching and transmission ratio adjustment are achieved via the first intermediate shaft assembly 132 , the second intermediate shaft assembly 133 and the third intermediate shaft assembly 134 .

[0064] The first intermediate shaft assembly 132 and the second intermediate shaft assembly 133 each include a clutch, and the third intermediate shaft assembly 134 includes two clutches, so that the power shift transmission can achieve gear switching and transmission ratio adjustment by only cooperating with four clutches. The power shift transmission has fewer gears, and the number of clutches used is significantly reduced, the structural design is relatively simple, and the cost and manufacturing difficulty are significantly reduced. By utilizing the wide speed range of the main drive motor 8 and matching the power shift transmission with fewer gears, it is possible to basically achieve a typical working condition where the transmission does not shift, reduce the number of clutch disengagement and engagement, and effectively improve the reliability of the clutch used.

[0065] In an optional scheme of this embodiment, the input shaft assembly 130 includes an input shaft 1301 and a first gear 1302, the first gear 1302 is connected to the input shaft 1301, and the main drive motor 8 is connected to the input shaft 1301, so that in the input shaft assembly 130, the main drive motor 8 can drive the input shaft 1301 to rotate, so that the input shaft 1301 can drive the first gear 1302 to rotate.

[0066] The hybrid power shift transmission system also includes a first clutch 10, a second gear 12, a third gear 11 and a PTO (power take off), which is also called a power take-off and is used to connect an auxiliary device. The input shaft 1301 is connected to the second gear 12 through the first clutch 10, the third gear 11 is meshed with the second gear 12, and the PTO is connected to the third gear 11, so that when the first clutch 10 is closed, the power of the main drive motor 8 is sequentially supplied to the PTO auxiliary device through the input shaft 1301 of the input shaft assembly 130, the first clutch 10, the second gear 12 and the third gear 11.

[0067] Optionally, the hybrid power shift transmission system further includes a transmission shaft 9, the first clutch 10 and the second gear 12 are both arranged on the transmission shaft 9, and the transmission shaft 9 is connected to the input shaft 1301 via a coupling.

[0068] In an optional solution of this embodiment, the first intermediate shaft assembly 132 includes a first intermediate shaft 1321 , a fourth gear 1320 and a fifth gear 1322 , and the clutch of the first intermediate shaft assembly 132 is a second clutch 1323 .

[0069] The fourth gear 1320 is connected to the first intermediate shaft 1321 and meshes with the first gear 1302. The fourth gear 1320 is connected to the fifth gear 1322 via the second clutch 1323. In other words, the fourth gear 1320 is fixedly connected to the first intermediate shaft 1321. Therefore, when the second clutch 1323 is closed, the power at the first gear 1302 can be transmitted to the fifth gear 1322 through the fourth gear 1320; when the second clutch 1323 is disconnected, the power at the first gear 1302 is transmitted to the fourth gear 1320 but not to the fifth gear 1322.

[0070] Optionally, a bearing is provided between the fifth gear 1322 and the first intermediate shaft 1321 , so that the fifth gear 1322 can rotate around the first intermediate shaft 1321 .

[0071] In an optional solution of this embodiment, the second intermediate shaft assembly 133 includes a second intermediate shaft 1333 , a sixth gear 1331 , a seventh gear 1334 , an eighth gear 1335 and a ninth gear 1330 , and the clutch of the second intermediate shaft assembly 133 is a third clutch 1332 .

[0072] The sixth gear 1331 is connected to the second intermediate shaft 1333 and meshes with the fourth gear 1320. The sixth gear 1331 is connected to the seventh gear 1334 and the eighth gear 1335 through the third clutch 1332, and the ninth gear 1330 is connected to the second intermediate shaft 1333. The sixth gear 1331 and the ninth gear 1330 are coaxially fixedly connected to the second intermediate shaft 1333. The power at the fourth gear 1320 can be transmitted to the second intermediate shaft 1333, the second intermediate shaft 1333 can drive the ninth gear 1330 to rotate, and the power at the fourth gear 1320 can be transmitted to the ninth gear 1330. When the third clutch 1332 is closed, the sixth gear 1331, the seventh gear 1334, the eighth gear 1335 and the ninth gear 1330 rotate synchronously; when the third clutch 1332 is disconnected, the sixth gear 1331 and the ninth gear 1330 rotate independently of the seventh gear 1334 and the eighth gear 1335.

[0073] Optionally, a bearing is provided between the seventh gear 1334 and the second intermediate shaft 1333 so that the seventh gear 1334 can rotate around the second intermediate shaft 1333 ; a bearing is provided between the eighth gear 1335 and the second intermediate shaft 1333 so that the eighth gear 1335 can rotate around the second intermediate shaft 1333 .

[0074] In an optional solution of this embodiment, the third intermediate shaft assembly 134 includes a third intermediate shaft 1342 , a tenth gear 1340 , an eleventh gear 1344 and a twelfth gear 1345 , and the clutch of the third intermediate shaft assembly 134 includes a fourth clutch 1341 and a fifth clutch 1343 .

[0075] The third intermediate shaft 1342 is connected to the tenth gear 1340 through the fourth clutch 1341, and the tenth gear 1340 is meshed with the ninth gear 1330, so that the power at the ninth gear 1330 can be transmitted to the tenth gear 1340. When the fourth clutch 1341 is closed, the power at the ninth gear 1330 can be transmitted to the third intermediate shaft 1342 via the tenth gear 1340 and the fourth clutch 1341; when the fourth clutch 1341 is disconnected, the tenth gear 1340 and the third intermediate shaft 1342 rotate independently of each other.

[0076] The third intermediate shaft 1342 is connected to the eleventh gear 1344 through the fifth clutch 1343, and the eleventh gear 1344 is meshed with the sixth gear 1331, so that the power at the sixth gear 1331 can be transmitted to the eleventh gear 1344. When the fifth clutch 1343 is closed, the power at the sixth gear 1331 can be transmitted to the third intermediate shaft 1342 via the eleventh gear 1344; when the fifth clutch 1343 is opened, the eleventh gear 1344 and the third intermediate shaft 1342 rotate independently of each other.

[0077] The twelfth gear 1345 is connected to the third intermediate shaft 1342 , and the twelfth gear 1345 is meshed with the eighth gear 1335 , that is, the twelfth gear 1345 is coaxially fixedly connected with the third intermediate shaft 1342 , and the power at the eighth gear 1335 can be transmitted to the third intermediate shaft 1342 via the twelfth gear 1345 .

[0078] Optionally, a bearing is provided between the tenth gear 1340 and the third intermediate shaft 1342 , so that the tenth gear 1340 can rotate around the third intermediate shaft 1342 ; similarly, a bearing is provided between the eleventh gear 1344 and the third intermediate shaft 1342 , so that the eleventh gear 1344 can rotate around the third intermediate shaft 1342 .

[0079] In an optional scheme of this embodiment, the output shaft assembly 135 includes an output shaft 1351 and a thirteenth gear 1350. The thirteenth gear 1350 is connected to the output shaft 1351, and the thirteenth gear 1350 is meshed with the twelfth gear 1345. The power at the twelfth gear 1345 can be transmitted to the output shaft 1351 via the thirteenth gear 1350.

[0080] The output shaft assembly 135 also includes a normally closed clutch 1352, which is connected to the output shaft 1351. When the normally closed clutch 1352 is closed, the output shaft 1351 is rigidly connected to the gearbox housing and cannot rotate, so that parking brake can be achieved. When the normally closed clutch 1352 is disconnected, the output shaft 1351 can rotate relative to the gearbox housing, so that power can be transmitted to the wheel hub through the output shaft assembly 135 to achieve walking.

[0081] In summary, in combination with Table 1, the transmission routes of each gear position realized by the power shift transmission of the hybrid power shift transmission system according to its shift strategy are described:

[0082]

[0083] Table 1 Clutch control strategy table of the shifting power transmission in each gear

[0084] When in the parking gear, the active plate group of the normally closed clutch 1352 is pressed and combined with its driven plate group under the action of spring force, and the friction force between the active plate group and the driven plate group makes the output shaft 1351 rigidly connected to the gearbox case, so that the output shaft 1351 cannot rotate, thereby realizing the parking brake of the front axle and the rear axle connected thereto through the output shaft 1351.

[0085] In the first gear, the normally closed clutch 1352 overcomes the spring force under the action of the controlled oil pressure, and its active plate group and driven plate group are separated, so that the normally closed clutch 1352 is disconnected. The second clutch 1323 is controlled to be closed, the third clutch 1332 is disconnected, and the fourth clutch 1341 and the fifth clutch 1343 are disconnected, so that the power at the input shaft assembly 130 is sequentially transmitted to the output shaft 1351 through the first gear 1302, the fourth gear 1320, the second clutch 1323, the fifth gear 1322, the sixth gear 1331, the seventh gear 1334, the twelfth gear 1345 and the thirteenth gear 1350, thereby realizing the driving of the front axle and the rear axle. Among them, the number of teeth of the first gear 1302 is Z1, the number of teeth of the fourth gear 1320 is Z2, the number of teeth of the fifth gear 1322 is Z3, the number of teeth of the sixth gear 1331 is Z5, the number of teeth of the seventh gear 1334 is Z6, the number of teeth of the twelfth gear 1345 is Z10, and the number of teeth of the thirteenth gear 1350 is Z11, then the transmission ratio in the first gear is

[0086] In the second gear, the normally closed clutch 1352 is controlled to be disconnected, the second clutch 1323 is controlled to be disconnected, the third clutch 1332 is controlled to be closed, and the fourth clutch 1341 and the fifth clutch 1343 are controlled to be disconnected, so that the power at the input shaft assembly 130 is sequentially transmitted through the first gear 1302, the fourth gear 1320, the fifth gear 1322, the sixth gear 1331, the third clutch 1332, the eighth gear 1335, the twelfth gear 1345 and the thirteenth gear 1350 to the output shaft 1351, thereby realizing the driving of the front axle and the rear axle. Among them, the number of teeth of the eighth gear 1335 is Z7, and the transmission ratio in the second gear is

[0087] In the third gear, the normally closed clutch 1352 is controlled to be disconnected, the second clutch 1323 is controlled to be disconnected, the third clutch 1332 is controlled to be disconnected, the fourth clutch 1341 is controlled to be disconnected, and the fifth clutch 1343 is controlled to be closed, so that the power at the input shaft assembly 130 is sequentially transmitted to the output shaft 1351 through the first gear 1302, the fourth gear 1320, the sixth gear 1331, the eleventh gear 1344, the twelfth gear 1345 and the thirteenth gear 1350, thereby realizing the driving of the front axle and the rear axle. Among them, the number of teeth of the eleventh gear 1344 is Z9, and the transmission ratio in the third gear is

[0088] In the 4th gear, the normally closed clutch 1352 is controlled to be disconnected, the second clutch 1323 is controlled to be disconnected, the third clutch 1332 is controlled to be disconnected, the fourth clutch 1341 is controlled to be closed, and the fifth clutch 1343 is controlled to be disconnected, so that the power at the input shaft assembly 130 is sequentially transmitted through the first gear 1302, the fourth gear 1320, the sixth gear 1331, the ninth gear 1330, the tenth gear 1340, the fourth clutch 1341, the third intermediate shaft 1342, the twelfth gear 1345 and the thirteenth gear 1350 to the output shaft 1351, thereby realizing the driving of the front axle and the rear axle. Among them, the number of teeth of the ninth gear 1330 is Z4, the number of teeth of the tenth gear 1340 is Z8, and the transmission ratio in the 4th gear is

[0089] For the PTO, when the auxiliary device needs to be driven, the first clutch 10 is closed, and when the auxiliary device does not need to be driven, the first clutch 10 is opened.

[0090] It can be understood that when the articulated tractor is moving forward, it can be achieved by the forward rotation of the main drive motor 8, and multiple forward gears can be achieved by cooperating with the shifting strategy of the above power shift transmission; when the articulated tractor is moving backward, it can be achieved by the reverse rotation of the main drive motor 8, and multiple reverse gears can be achieved by cooperating with the shifting strategy of the above power shift transmission.

[0091] Embodiment 2

[0092] Embodiment 2 provides an articulated tractor, which includes the hybrid power shift transmission system in embodiment 1. The technical features of the hybrid power shift transmission system disclosed in embodiment 1 are also applicable to this embodiment, and the technical features of the hybrid power shift transmission system disclosed in embodiment 1 will not be described repeatedly.

[0093] The articulated tractor in this embodiment has the advantages of the hybrid power shift transmission system in the first embodiment, and the advantages of the hybrid power shift transmission system disclosed in the first embodiment will not be repeatedly described here.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them; although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalent; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the utility model. In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments instead of other features, the combination of features of different embodiments means that they are within the scope of the utility model and form different embodiments. For example, any one of the embodiments claimed for protection can be used in any combination. The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the utility model, and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A hybrid power shift transmission system, characterized in that: It includes working pump set, engine, generator, main drive motor and power shift gearbox; The engine is connected to the generator and can drive the generator to generate electricity; The engine is connected to the working pump group and can drive the working pump group to work; The generator is electrically connected to the main drive motor and can supply power to the main drive motor; The power shift transmission includes an input shaft assembly and an output shaft assembly, wherein the output shaft assembly is drivingly connected to the input shaft assembly, and the main drive motor is connected to the input shaft assembly to drive the output shaft assembly.

2. The hybrid power shift transmission system according to claim 1, characterized in that: It also includes an energy storage unit, which is electrically connected to the generator and the main drive motor.

3. The hybrid power shift transmission system according to claim 2, characterized in that: Also includes a first control unit, a second control unit and a third control unit; The generator and the main drive motor are electrically connected via the first control unit, the second control unit and the third control unit in sequence, and the second control unit is electrically connected to the energy storage unit; When the load of the main drive motor increases, the second control unit and the third control unit first control the energy storage unit and the generator to jointly supply power to the main drive motor for a predetermined period of time, so as to compensate for the response delay of the first control unit in controlling the generator to the load.

4. The hybrid power shift transmission system according to claim 1, characterized in that: The power shift transmission also includes a first intermediate shaft assembly, a second intermediate shaft assembly and a third intermediate shaft assembly; The input shaft assembly and the output shaft assembly are transmission-connected via the first intermediate shaft assembly, the second intermediate shaft assembly and the third intermediate shaft assembly; The first intermediate shaft assembly and the second intermediate shaft assembly each include a clutch, and the third intermediate shaft assembly includes two clutches.

5. The hybrid power shift transmission system according to claim 4, characterized in that: The input shaft assembly includes an input shaft and a first gear, the first gear is connected to the input shaft, and the main drive motor is connected to the input shaft; The hybrid power shift transmission system further includes a first clutch, a second gear, a third gear and a PTO, the input shaft is connected to the second gear via the first clutch, the third gear is meshed with the second gear, and the PTO is connected to the third gear.

6. The hybrid power shift transmission system according to claim 5, characterized in that: The first intermediate shaft assembly includes a first intermediate shaft, a fourth gear and a fifth gear, and the clutch of the first intermediate shaft assembly is a second clutch; The fourth gear is connected to the first intermediate shaft and meshes with the first gear, and the fourth gear is connected to the fifth gear through the second clutch.

7. The hybrid power shift transmission system according to claim 6, characterized in that: The second intermediate shaft assembly includes a second intermediate shaft, a sixth gear, a seventh gear, an eighth gear and a ninth gear, and the clutch of the second intermediate shaft assembly is a third clutch; The sixth gear is connected to the second intermediate shaft and meshes with the fourth gear. The sixth gear is connected to the seventh gear and the eighth gear through the third clutch. The ninth gear is connected to the second intermediate shaft.

8. The hybrid power shift transmission system according to claim 7, characterized in that: The third intermediate shaft assembly includes a third intermediate shaft, a tenth gear, an eleventh gear and a twelfth gear, and the clutch of the third intermediate shaft assembly includes a fourth clutch and a fifth clutch; The third intermediate shaft is connected to the tenth gear through the fourth clutch, and the tenth gear is meshed with the ninth gear; The third intermediate shaft is connected to the eleventh gear through the fifth clutch, and the eleventh gear is meshed with the sixth gear; The twelfth gear is connected to the third intermediate shaft, and the twelfth gear is meshed with the eighth gear.

9. The hybrid power shift transmission system according to claim 8, characterized in that: The output shaft assembly includes an output shaft and a thirteenth gear, the thirteenth gear is connected to the output shaft, and the thirteenth gear is meshed with the twelfth gear; The output shaft assembly also includes a normally closed clutch, and the normally closed clutch is connected to the output shaft.

10. An articulated tractor, characterized in that: A hybrid power shift transmission system comprising any one of claims 1 to 9.

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