CN118149058A - Hybrid power system and walking work machine - Google Patents

Abstract

The invention relates to the field of hybrid power, and discloses a hybrid power system and a walking operation machine.A power coupling box in the system can sequentially drive an operation power input shaft, an operation transmission mechanism and an operation power output shaft, and can sequentially drive the walking power input shaft, the walking transmission mechanism and the walking power output shaft, and a conversion transmission mechanism capable of transmitting power on the operation power input shaft to the walking power input shaft; the power input assembly in the system comprises an engine, a generator and a power battery which are sequentially connected, and a working motor and a walking motor which are respectively connected with the power battery. In addition, the operation motor and the walking motor are respectively connected with the operation power input shaft and the walking power input shaft, and the engine, the operation motor and the walking motor are mutually independent to start and stop. The invention can meet the dual requirements of energy conservation and long endurance, ensure to obtain the best operation efficiency, reduce the system cost and the arrangement difficulty and improve the adaptability under different working conditions.

Description

Hybrid power system and walking work machine

Technical Field

The invention belongs to the technical field of hybrid power, and particularly relates to a hybrid power system and a walking operation machine.

Background

With the development of new energy industry, walking operation machines such as agricultural machines and engineering machines are planning low-carbon development routes, and novel energy-saving and emission-reducing routes are explored. In the case of agricultural machinery such as a tractor, the conventional fuel power is adopted at present, and the defects of low working efficiency, high emission, poor economical efficiency and the like exist, so that a new energy power system needs to be designed to solve the problems.

The pure electric power system has the advantages of zero emission and simple transmission, but is limited by battery cost and energy supplementing efficiency, and is difficult to meet the long-time operation requirement of the walking operation machine. The engine of the hybrid power system can theoretically work in a high-efficiency area, can obtain obvious energy-saving effect, and can meet the long-time continuous operation requirement of the walking operation machinery. However, in practice, the hybrid power system technology applied to the running operation machine is not really mature, and the expected better energy-saving and long-endurance effect cannot be obtained, so that more optimal designs are still necessary.

Disclosure of Invention

The invention aims to provide a hybrid power system and a walking operation machine, which can meet the double requirements of energy conservation and long endurance, ensure that the best operation efficiency is always obtained, reduce the system cost and the arrangement difficulty, and improve the adaptability under different working conditions.

To achieve the above object, an aspect of the present invention provides a hybrid system including:

The power coupling box comprises a shell, and a power shaft assembly and a transmission assembly which are arranged in the shell, wherein the power shaft assembly comprises a working power input shaft, a working power output shaft, a walking power input shaft and a walking power output shaft, and the transmission assembly comprises a working transmission mechanism arranged between the working power input shaft and the working power output shaft, a walking transmission mechanism arranged between the walking power input shaft and the walking power output shaft and a conversion transmission mechanism capable of transmitting power on the working power input shaft to the walking power input shaft; and

The power input assembly comprises an engine, a generator, a power battery, a working motor and a traveling motor, wherein the engine, the generator and the power battery are sequentially connected, and the working motor and the traveling motor are respectively connected with the power battery;

the working motor is connected with the working power input shaft, the walking motor is connected with the walking power input shaft, and the engine, the working motor and the walking motor are started and stopped independently.

In some embodiments, the conversion transmission mechanism comprises a conversion idler gear and a conversion socket gear which are meshed with each other, the operation transmission mechanism comprises an operation idler gear and an operation socket gear which are meshed with each other, and the transmission assembly further comprises a conversion synchronizer;

wherein the operation idler gear and the conversion idler gear are sleeved on the operation power input shaft at intervals along the axial direction, the conversion sleeve gear is sleeved on the walking power input shaft, the operation sleeve gear is sleeved on the operation power output shaft, and the conversion synchronizer is sleeved on the operation power input shaft and can be alternatively engaged with the operation idler gear and the conversion idler gear.

In some embodiments, the hybrid power system includes a travel motor-only travel mode in which the engine, generator, and work motor are all off, and the power battery drives the travel motor to operate such that the travel motor, travel power input shaft, travel transmission mechanism, and travel power output shaft are sequentially driven.

In some embodiments, the hybrid powertrain includes a work motor-only travel mode in which the engine, generator, and travel motor are all off, and the power battery drives the work motor to operate, with the conversion synchronizer engaged with the conversion idler gear such that the work motor, the work power input shaft, the conversion synchronizer, the conversion idler gear, the conversion socket gear, the travel power input shaft, the travel transmission mechanism, and the travel power output shaft are sequentially driven.

In some embodiments, the hybrid powertrain includes a two-motor-only travel mode in which both the engine and the generator are off, the power battery drives the work motor and the travel motor to operate, and the conversion synchronizer is engaged with the conversion idler gear such that the travel power input shaft couples power from the work motor and the travel motor and transmits the coupled power to the travel power output shaft through the travel transmission.

In some embodiments, the hybrid system includes a two-motor-only electric mode of operation in which both the engine and the generator are off, the power battery drives the operation motor and the travel motor to operate, the conversion synchronizer is engaged with the operation idler gear such that the operation motor, the operation power input shaft, the conversion synchronizer, the operation idler gear, the operation socket gear, the operation power output shaft are sequentially driven, and such that the travel motor, the travel power input shaft, the travel transmission mechanism, and the travel power output shaft are sequentially driven.

In some embodiments, the hybrid power system includes a travel motor up Cheng Hangzou mode, in which the work motor is stopped and the engine, generator, power battery, and travel motor are all operated such that the travel motor, travel power input shaft, travel drive mechanism, and travel power output shaft are sequentially driven.

In some embodiments, the hybrid powertrain includes a work motor up Cheng Hangzou mode in which the work motor is off, and the engine, generator, power battery, and work motor are all running, and the conversion synchronizer is engaged with the conversion idler gear such that the work motor, work power input shaft, conversion synchronizer, conversion idler gear, conversion socket gear, travel power input shaft, travel transmission mechanism, and travel power output shaft are sequentially driven.

In some embodiments, the hybrid powertrain includes a two-motor extended-range mode Cheng Hangzou in which the engine, generator, power battery, work motor, and travel motor are all running, and the conversion synchronizer is engaged with the conversion idler gear such that the travel power input shaft couples power from the work motor and travel motor and transmits the coupled power to the travel power output shaft through the travel transmission.

In some embodiments, the hybrid system includes a two-motor extended Cheng Zuoye mode in which the engine, generator, power battery, work motor, and travel motor are all running, the conversion synchronizer is engaged with the work idler gear such that the work motor, work power input shaft, conversion synchronizer, work idler gear, work socket gear, work power output shaft are sequentially driven, and such that the travel motor, travel power input shaft, travel transmission mechanism, and travel power output shaft are sequentially driven.

In some embodiments, the working power input shaft, the working power output shaft, the walking power input shaft and the walking power output shaft are sequentially arranged at intervals in parallel along a first direction, the working motor and the walking motor are respectively and coaxially connected with the working power input shaft and the walking power input shaft along a second direction perpendicular to the first direction, and the engine and the generator are coaxially connected along the first direction.

The second aspect of the present invention also provides a walking work machine, comprising:

the hybrid system described above;

The operation mechanism is in transmission connection with the operation power output shaft; and

The walking mechanism is in transmission connection with the walking power output shaft.

In the hybrid power system and the walking operation machine, the engine does not directly participate in driving operation and traveling, decoupling of the engine rotating speed, the operation speed and the traveling speed can be achieved, the engine can always run at the highest efficiency point to drive the generator to generate electricity, and the fuel economy is improved. When the electric quantity of the power battery is insufficient, the generator can be driven by the engine to generate electricity so as to supplement the electric quantity of the power battery, thereby meeting the requirement of long endurance. Meanwhile, the operation motor directly drives the operation, so that the stepless speed change of an operation mechanism of the walking operation machine can be realized, and the optimal operation efficiency can be obtained.

In addition, the hybrid power system has a plurality of power modes for switching, and the adaptability under different working conditions can be improved. In particular, since the conversion transmission mechanism is provided, the work motor can drive the travel motor together, and thus the maximum power torque requirement on the travel motor can be reduced, which corresponds to cost reduction.

Furthermore, as the generator is not mechanically connected with the operation motor and the walking motor, the generator, the operation motor and the walking motor do not need to be coaxially arranged, namely, the engine, the generator, the operation motor and the walking motor can be arranged in a staggered manner, so that the arrangement difficulty can be reduced, and the arrangement flexibility is improved.

Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. Other figures may be made from the structures shown in these figures without inventive effort for a person of ordinary skill in the art. In the drawings:

FIG. 1 is a schematic diagram of a power coupling box in accordance with an embodiment of the present invention;

fig. 2 is a schematic view of a hybrid system and a PTO (power take-off) and wheels driven by the hybrid system according to an embodiment of the present invention.

Description of the reference numerals

1 Operation power input shaft 2 shell

3 Conversion idler gear 4 conversion synchronizer

5-Operation idler gear 6-operation sleeve gear

7 Support gear 8 operation power output shaft

9 Walking power output shaft 10 conversion sleeve gear

11 Low gear idler gear 12 low gear sleeve gear

13 Speed-changing synchronizer 14 high gear sleeve gear

15 High-gear idler gear 16 walking power input shaft

17 Engine 18 generator

19 Power battery 20 walking motor

21 Operation motor 22 walking motor controller

23 Operation motor controller 24 generator controller

25 High voltage distribution box 26PTO

Detailed Description

The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.

Referring to fig. 1, a first exemplary embodiment of the present invention provides a power coupling box including a housing 2, and a power shaft assembly and a transmission assembly disposed within the housing 2.

Specifically, the power shaft assembly includes a working power input shaft 1, a working power output shaft 8, a traveling power input shaft 16, and a traveling power output shaft 9. The transmission assembly includes a work transmission mechanism provided between the work power input shaft 1 and the work power output shaft 8, a travel transmission mechanism provided between the travel power input shaft 16 and the travel power output shaft 9, and a conversion transmission mechanism provided between the work power input shaft 1 and the travel power input shaft 16.

When the power coupling box is used, the traveling power input shaft 16 can be connected to a traveling power input device (for example, a traveling motor) outside the box, and the traveling power output shaft 9 can be connected to a traveling mechanism outside the box in a transmission manner. When the walking power input device is operated, power can be transmitted to a walking mechanism in a walking working machine such as a tractor through the sequential transmission of the walking power input shaft 16, the walking transmission mechanism and the walking power output shaft 9, so that the walking working machine is driven to walk. The power coupling box is provided with a traveling power transmission path in which the traveling power input shaft 16, the traveling transmission mechanism, and the traveling power output shaft 9 are sequentially transmitted.

The Power coupling box is provided with a work Power transmission path in which the work Power input shaft 1, the work Power transmission mechanism, and the work Power output shaft 8 sequentially transmit work Power to the work Power output device by sequential transmission of the work Power input shaft 1, the work Power transmission mechanism, and the work Power output shaft 8 when the work Power input device is operated.

When the working power input device is operated, power can be transmitted to a traveling mechanism in a traveling working machine such as a tractor by sequential transmission of the working power input shaft 1, the conversion transmission mechanism, the traveling power input shaft 16, the traveling transmission mechanism and the traveling power output shaft 9, so that the traveling working machine is driven to travel. The power coupling box is further provided with a conversion power transmission path which is sequentially transmitted by the operation power input shaft 1, the conversion transmission mechanism, the traveling power input shaft 16, the traveling transmission mechanism and the traveling power output shaft 9. At this time, if the traveling power input device is not operated, the traveling is driven by only the power supplied from the working power input device; if the traveling power input device operates simultaneously, the power provided by the traveling power input device and the power provided by the working power input device can be coupled to the traveling power input shaft 16, and then the coupled power is transmitted to the traveling mechanism through the sequential transmission of the traveling power input shaft 16, the traveling transmission mechanism and the traveling power output shaft 9.

Through the arrangement, the power coupling box provided by the invention is provided with three different power transmission routes, namely a walking power transmission route, a working power transmission route and a conversion power transmission route. The power coupling box can independently call any one of the three power transmission routes or couple the power for converting the power transmission route and the walking power transmission route, so that the power coupling box has various power transmission modes capable of being switched, and the adaptability to different working conditions can be improved.

Particularly, as the power transmission route of the power coupling box can convert the operation power into the walking power, the walking power input device in the walking operation machinery can be stopped at proper time, and the walking power input device is used for temporarily driving the walking, so that the long-time operation pressure of the walking power input device can be reduced, the power coupling box is particularly suitable for some working conditions with longer continuous walking time and relatively shorter operation time, the service life of the walking power input device is prolonged, and the utilization rate of the walking power input device can be improved.

In addition, as the walking power transmission route and the conversion power transmission route of the power coupling box can realize power coupling, the total power required by driving walking can be shared by the operation power input device, so that the maximum operation power requirement on the walking power input device can be reduced, namely the type selection requirement on the walking power input device is reduced. Under some working conditions requiring low-power walking, the power redundancy can be reduced due to the reduction of the model selection standard of the walking power input device, so that the cost can be effectively reduced, and the economical efficiency is improved.

The invention is not limited to the specific composition of the operation transmission mechanism, the walking transmission mechanism and the conversion transmission mechanism, and for example, different modes such as gear transmission, chain transmission, belt transmission, worm and gear transmission and the like can be adopted.

In some embodiments, the conversion transmission mechanism includes a conversion idler gear 3 and a conversion socket gear 10 that are meshed with each other, one of the conversion idler gear 3 and the conversion socket gear 10 being sleeved on the working power input shaft 1 and the other being sleeved on the walking power input shaft 16. In addition, the transmission assembly includes a shift synchronizer 4.

When the conversion idler gear 3 is idly sleeved on the working power input shaft 1 and the conversion sleeve gear 10 is fixedly sleeved on the traveling power input shaft 16 (refer to fig. 1), the conversion synchronizer 4 is sleeved on the working power input shaft 1 and can be engaged with or disengaged from the conversion idler gear 3 (i.e., at this time, the conversion synchronizer 4 is fixed to the working power input shaft 1 in the circumferential direction, and the conversion synchronizer 4 can move in the axial direction of the working power input shaft 1). If the conversion synchronizer 4 is engaged with the conversion idler gear 3, the power of the working power input shaft 1 can be transmitted to the traveling power input shaft 16 by the conversion synchronizer 4, the conversion idler gear 3, and the conversion socket gear 10 in this order. If the conversion synchronizer 4 is separated from the conversion idler gear 3, the power of the working power input shaft 1 cannot be transmitted to the conversion idler gear 3, and the traveling power input shaft 16 cannot be driven.

When the conversion idler gear 3 is in the idle state on the traveling power input shaft 16 and the conversion sleeve gear 10 is fixedly sleeved on the working power input shaft 1 (not shown), the conversion synchronizer 4 is sleeved on the traveling power input shaft 16 and can be engaged with or disengaged from the conversion idler gear 3 (i.e., at this time, the conversion synchronizer 4 is fixed to the traveling power input shaft 16 in the circumferential direction, and the conversion synchronizer 4 can move along the axial direction of the traveling power input shaft 16). If the conversion synchronizer 4 is engaged with the conversion idler gear 3, the power of the working power input shaft 1 can be transmitted to the traveling power input shaft 16 by the conversion idler gear 10, the conversion idler gear 3, and the conversion synchronizer 4 in this order. If the conversion synchronizer 4 is separated from the conversion idler gear 3, the power of the working power input shaft 1 cannot be transmitted to the conversion synchronizer 4, and the traveling power input shaft 16 cannot be driven.

Therefore, the power coupling box of the embodiment is easy to control whether to adopt a conversion power transmission route or not through the engagement or the separation of the conversion synchronizer 4 and the conversion idler gear 3, and has the advantages of less transmission parts, easy arrangement, low cost and stability improvement.

In some embodiments, referring to fig. 1, conversion idler gear 3 is idly sleeved on work power input shaft 1, conversion sleeve gear 10 is fixedly sleeved on walking power input shaft 16, and conversion synchronizer 4 is sleeved on work power input shaft 1. On this basis, the working transmission mechanism can comprise a working idler gear 5 and a working socket gear 6 which are meshed with each other.

Specifically, the working idler gear 5 and the conversion idler gear 3 are axially and alternately sleeved on the working power input shaft 1, the working sleeve gear 6 is sleeved on the working power output shaft 8, and the conversion synchronizer 4 is located between the working idler gear 5 and the conversion idler gear 3 and can be alternatively engaged with the working idler gear 5 and the conversion idler gear 3.

According to the foregoing, when the conversion synchronizer 4 is engaged with the conversion idler gear 3, the power of the working power input shaft 1 can be transmitted to the traveling power input shaft 16, which is not described herein. When the conversion synchronizer 4 is engaged with the working idler gear 5, the power of the working power input shaft 1 is transmitted to the working power output shaft 8 through the conversion synchronizer 4, the working idler gear 5, and the working sleeve gear 6, thereby driving the working power output shaft 8. When the conversion synchronizer 4 is separated from the conversion idler gear 3 and the working idler gear 5, the power of the working power input shaft 1 cannot be transmitted to the traveling power input shaft 16 nor the working power output shaft 8.

In contrast, if the conversion idler gear 3 is in the idle state on the traveling power input shaft 16, the conversion sleeve gear 10 is fixedly sleeved on the operation power input shaft 1, and the conversion synchronizer 4 is sleeved on the traveling power input shaft 16, an additional synchronizer is required to be provided to realize the power transmission from the operation power input shaft 1 to the operation power output shaft 8.

It can be seen that the present embodiment can switch the power transmission direction of the working power input shaft 1 by a single conversion synchronizer 4, is easy to operate, and saves the number of synchronizers 4 most.

Further, with continued reference to fig. 1, the transmission assembly may also include a support gear 7 that is rotatably received about the travel power input shaft 16 and that is engaged with the work socket gear 6, i.e., where the work socket gear 6 is engaged between the work idler gear 5 and the support gear 7. The support gear 7 can strengthen the support to the operation sleeve gear 6, guarantees that the operation sleeve gear 6 and the operation idler gear 5 are tightly meshed, and therefore transmission stability and reliability are improved. In addition, the support gear 7 is supported by the walking power input shaft 16, and other shaft structures are not required to be additionally arranged to support the support gear 7, so that the structure of the power coupling box can be simplified, the number of parts is reduced, and the cost is reduced.

In some embodiments, the walking transmission mechanism comprises a plurality of walking idler gears and a plurality of walking sleeve gears, one of the walking power input shaft 16 and the walking power output shaft 9 is sleeved with the plurality of walking idler gears which are sequentially spaced along the axial direction, and the other one is fixedly sleeved with the plurality of walking sleeve gears which are respectively meshed with the plurality of walking idler gears. In addition, the transmission assembly includes a speed change synchronizer 13.

When a plurality of traveling idler gears are sleeved on the traveling power input shaft 16 at intervals in sequence along the axial direction, a plurality of traveling sleeve gears are fixedly sleeved on the traveling power output shaft 9, and the traveling sleeve gears are respectively meshed with the traveling idler gears (the transmission ratios of the traveling sleeve gears and the traveling idler gears which are meshed in a plurality of groups are different). The traveling power input shaft 16 is further provided with a speed change synchronizer 13 interposed between two adjacent traveling idler gears (the speed change synchronizer 13 is fixed to the traveling power input shaft 16 in the circumferential direction, and the speed change synchronizer 13 is movable in the axial direction of the traveling power input shaft 16). By engaging the gear-change synchronizer 13 with different running idler gears, the running power input shaft 16 and the running power output shaft 9 can realize a gear-change transmission, thereby adjusting the running speed.

For example, referring to fig. 1, a low-gear idler gear 11 and a high-gear idler gear 15 that are axially spaced in order may be idly sleeved on the traveling power input shaft 16, and a low-gear sleeve gear 12 that meshes with the low-gear idler gear 11 and a high-gear sleeve gear 14 that meshes with the high-gear idler gear 15 are fixedly sleeved on the traveling power output shaft 9. The transmission ratio of the high gear sleeve gear 14 to the high gear idler gear 15 is smaller than the transmission ratio of the low gear sleeve gear 12 to the low gear idler gear 11. The shift synchronizer 13 is disposed around the traveling power input shaft 16 between the low-gear idler gear 11 and the high-gear idler gear 15, and can be engaged with the low-gear idler gear 11 and the high-gear idler gear 15 alternatively.

When a plurality of traveling idler gears (not shown) are sleeved above the traveling power output shaft 9 and sequentially spaced along the axial direction, the traveling power input shaft 16 is fixedly sleeved with the traveling sleeve gears, and the traveling sleeve gears are respectively meshed with the traveling idler gears (the transmission ratios of the traveling sleeve gears and the traveling idler gears which are meshed in a plurality of groups are different). In addition, a speed change synchronizer 13 (the speed change synchronizer 13 is fixed with the walking power output shaft 9 along the circumferential direction, and the speed change synchronizer 13 can move along the axial direction of the walking power output shaft 9) positioned between two adjacent walking idler gears is sleeved on the walking power output shaft 9 at the moment. By engaging the gear-change synchronizer 13 with different running idler gears, the running power input shaft 16 and the running power output shaft 9 can realize a gear-change transmission, thereby adjusting the running speed.

In some embodiments, referring to fig. 1, work power input shaft 1, work power output shaft 8, travel power input shaft 16, and travel power output shaft 9 may be sequentially arranged in parallel at intervals along the first direction. In this way, the operation transmission mechanism between the operation power input shaft 1 and the operation power output shaft 8, the walking transmission mechanism between the walking power input shaft 16 and the walking power output shaft 9, and the conversion transmission mechanism between the operation power input shaft 1 and the walking power input shaft 16 can be arranged in a small space range, transmission is realized by a shorter stroke, the structure composition of each transmission mechanism is simplified (transmission can be realized only by meshing two gears), the size of the power coupling box is reduced, and the manufacturing difficulty and cost are reduced.

Further, the housing 2 includes a first housing wall and a second housing wall spaced in parallel along a second direction perpendicular to the first direction, the input end of the working power input shaft 1 and the input end of the traveling power input shaft 16 each pass out of the first housing wall, the output end of the working power output shaft 8 and the output end of the traveling power output shaft 9 each pass out of the second housing wall, and the traveling transmission mechanism, the conversion transmission mechanism, and the working transmission mechanism are sequentially spaced along the second direction. In other words, the power input area, the transmission area and the power output area of the power coupling box are sequentially arranged along the second direction at this time, so that the first casing wall of the power coupling box is externally used for arranging the walking power input device and the operation power input device, and the second casing wall is externally used for arranging the power output devices or mechanisms such as the PTO26 and wheels, and meanwhile, the walking transmission mechanism, the conversion transmission mechanism and the operation transmission mechanism in the transmission area are sequentially arranged along the second direction, and therefore, the power coupling box has the characteristics of clear partition and concise layout no matter the power coupling box is of a self structure or is applied to the walking operation machine, and the arrangement mode and the transmission mode are optimized.

In addition, the working power input shaft 1, the walking power input shaft 16 and the walking power output shaft 9 can be rotatably connected with the first shell wall and the second shell wall in a penetrating manner so as to improve the balance of the two ends of the shaft and avoid the influence of the bending of the shaft when the transmission mechanism is heavy on the normal rotation of the shaft. In the layout of each shaft and each transmission mechanism shown in fig. 1, in order to avoid transmission interference, the input end of the working power output shaft 8 needs to be built in the housing 2 instead of being connected with the first housing wall in a penetrating manner, at this time, in order to balance the two ends of the working power output shaft 8, the support gear 7 may be additionally arranged, and the stability of the input end of the working power output shaft 8 may be enhanced by the support gear 7.

The second exemplary embodiment of the present invention also provides a hybrid system including a power input assembly including a work power input device connected to the work power input shaft 1 and a travel power input device connected to the travel power input shaft 16, such that power can be transmitted to the work power input shaft 1 through the work power input device, and power can be transmitted to the travel power input shaft 16 through the travel power input device, and the power coupling case described above.

The present invention is not limited to the types of power of the working power input device and the traveling power input device, such as an engine, a motor, and the like, and is not limited to the configuration of more power input devices in the hybrid system.

Referring to fig. 1 and 2, the power input assembly described above may include an engine 17 (including, but not limited to, a fuel engine (gasoline, diesel), steam engine, hot gas engine, etc.), an electric generator 18, a power battery 19, a work motor 21, and a travel motor 20. The engine 17, the generator 18, and the power battery 19 are connected in this order, so that the engine 17 can drive the generator 18 to generate electricity to supplement the power battery 19 with electricity, and the work motor 21 and the travel motor 20 are respectively connected to the power battery 19, and can obtain electricity from the power battery 19 to respectively operate.

The work motor 21 is connected to the work power input shaft 1, that is, the work motor 21 is used as the work power input device described above. The traveling motor 20 is connected to the traveling power input shaft 16, that is, the traveling motor 20 is used as the traveling power input device described above. Engine 17 (and generator 18), work motor 21, and travel motor 20 may be started and stopped independently of each other, thereby enabling the hybrid system to have multiple power modes for switching. In fig. 2, a solid line "—" indicates a mechanical connection, and a broken line "- - -" indicates an electrical connection.

Through the arrangement, the engine 17 does not directly participate in driving operation and running, so that decoupling of the engine rotating speed, the operation speed and the running speed can be realized, the engine 17 can always run at the highest efficiency point to drive the generator 18 to generate electricity, and the fuel economy is improved. When the power battery 19 is in a shortage, the engine 17 can drive the generator 18 to generate electricity so as to supplement the power battery 19, thereby meeting the long-endurance requirement. Meanwhile, the working motor 21 directly drives the work, the stepless speed change of the working mechanism of the walking working machine can be realized, and the optimal working efficiency can be obtained.

In addition, as can be seen from the foregoing, the power coupling box of the present invention has multiple power transmission modes for switching, and on this basis, the engine 17 (and the generator 18), the working motor 21 and the running motor 20 can be started and stopped independently, which means that the engine 17 and the generator 18 can timely participate in providing power, so that more power modes are further expanded in the hybrid power system, and the adaptability of the hybrid power system to different working conditions is greatly improved. In particular, since the power coupling box is provided with the conversion transmission mechanism, the work motor 21 can drive the traveling motor 20 together, and thus the maximum power torque requirement on the traveling motor 20 can be reduced, which corresponds to cost reduction.

Furthermore, since the generator 18 is not mechanically connected with the working motor 21 and the traveling motor 20, the three are not required to be coaxially arranged, i.e. the engine 17 and the generator 18 can be arranged in a staggered manner with the working motor 21 and the traveling motor 20, so that the arrangement difficulty can be reduced and the arrangement flexibility can be increased.

For example, when the working power input shaft 1, the working power output shaft 8, the traveling power input shaft 16, and the traveling power output shaft 9 are sequentially arranged in parallel at intervals in the first direction, the working motor 21 and the traveling motor 20 are coaxially connected with the working power input shaft 1 and the traveling power input shaft 16, respectively, in the second direction, and the engine 17 and the generator 18 are coaxially connected in the first direction, thereby achieving a misalignment arrangement of the engine 17 and the generator 18 with the working motor 21 and the traveling motor 20.

In some embodiments, referring to fig. 1 and 2, the conversion transmission mechanism comprises a conversion idler gear 3 and a conversion socket gear 10 that are meshed with each other, the operation transmission mechanism comprises a working idler gear 5 and a working socket gear 6 that are meshed with each other, and the transmission assembly further comprises a conversion synchronizer 4. In addition, the working idler gear 5 and the conversion idler gear 3 are sleeved on the working power input shaft 1 at intervals along the axial direction, the conversion sleeve gear 10 is sleeved on the walking power input shaft 16, the working sleeve gear 6 is sleeved on the working power output shaft 8, and the conversion synchronizer 4 is sleeved on the working power input shaft 1 and can be alternatively engaged with the working idler gear 5 and the conversion idler gear 3.

At this time, the hybrid system has at least a plurality of power modes listed below for switching:

1) Pure electric walking mode of walking motor

In this mode, the engine 17, the generator 18, and the work motor 21 are all stopped, and the power battery 19 drives the travel motor 20 to operate, so that the travel motor 20, the travel power input shaft 16, the travel transmission mechanism, and the travel power output shaft 9 are sequentially transmitted. This mode is applicable, for example, to small-load walking or plowing conditions of a tractor.

2) Pure electric walking mode of operation motor

In this mode, the engine 17, the generator 18 and the traveling motor 20 are all stopped, the power battery 19 drives the operation motor 21 to operate, and the conversion synchronizer 4 is engaged with the conversion idler gear 3, so that the operation motor 21, the operation power input shaft 1, the conversion synchronizer 4, the conversion idler gear 3, the conversion socket gear 10, the traveling power input shaft 16, the traveling transmission mechanism and the traveling power output shaft 9 are sequentially transmitted. This mode is applicable, for example, to small-load walking or plowing conditions of a tractor.

3) Double-motor pure electric walking mode

In this mode, both the engine 17 and the generator 18 are stopped, the power battery 19 drives the work motor 21 and the travel motor 20 to operate, and the conversion synchronizer 4 is engaged with the conversion idler gear 3, so that the travel power input shaft 16 couples power from the work motor 21 and the travel motor 20, and transmits the coupled power to the travel power output shaft 9 through the travel transmission mechanism. This mode is suitable for example for medium and heavy load walking or ploughing conditions of the tractor.

4) Double-motor pure electric operation mode

In this mode, both the engine 17 and the generator 18 are stopped, the power battery 19 drives the working motor 21 and the running motor 20 to operate, the conversion synchronizer 4 is engaged with the working idler gear 5, so that the working motor 21, the working power input shaft 1, the conversion synchronizer 4, the working idler gear 5, the working socket gear 6 and the working power output shaft 8 are sequentially driven, and the running motor 20, the running power input shaft 16, the running transmission mechanism and the running power output shaft 9 are sequentially driven. This mode is applicable, for example, to the working conditions (such as rotary tillage) of a tractor rear hitch.

5) Cheng Hangzou mode of walking motor

In this mode, the work motor 21 is stopped, and the engine 17, the generator 18, the power battery 19, and the travel motor 20 are all operated, so that the travel motor 20, the travel power input shaft 16, the travel transmission mechanism, and the travel power output shaft 9 are sequentially transmitted. This mode is applicable, for example, to small-load walking or plowing conditions of a tractor.

6) Cheng Hangzou mode of operation motor

In this mode, the running motor 20 is stopped, the engine 17, the generator 18, the power battery 19, and the work motor 21 are all operated, and the conversion synchronizer 4 is engaged with the conversion idler gear 3, so that the work motor 21, the work power input shaft 1, the conversion synchronizer 4, the conversion idler gear 3, the conversion socket gear 10, the running power input shaft 16, the running transmission mechanism, and the running power output shaft 9 are sequentially transmitted. This mode is applicable, for example, to small-load walking or plowing conditions of a tractor.

7) Double-motor Cheng Hangzou increasing mode

In this mode, the engine 17, the generator 18, the power battery 19, the work motor 21, and the travel motor 20 are all operated, and the conversion synchronizer 4 is engaged with the conversion idler gear 3, so that the travel power input shaft 16 couples power from the work motor 21 and the travel motor 20, and transmits the coupled power to the travel power output shaft 9 through the travel transmission mechanism. This mode is suitable for example for medium and heavy load walking or ploughing conditions of the tractor.

8) Dual-motor range-extending operation mode

In this mode, the engine 17, the generator 18, the power battery 19, the work motor 21, and the travel motor 20 are all operated, and the conversion synchronizer 4 is engaged with the work idler gear 5, so that the work motor 21, the work power input shaft 1, the conversion synchronizer 4, the work idler gear 5, the work socket gear 6, and the work power output shaft 8 are sequentially driven, and so that the travel motor 20, the travel power input shaft 16, the travel transmission mechanism, and the travel power output shaft 9 are sequentially driven. This mode is applicable, for example, to the working conditions (such as rotary tillage) of a tractor rear hitch.

Referring to fig. 2, the travel motor 20, the work motor 21, and the generator 18 are controlled by a travel motor controller 22, a work motor controller 23, and a generator controller 24, respectively. The travel motor controller 22, the work motor controller 23, and the generator controller 24 may be independent controllers, or may be integrated controllers of two or three combinations.

The travel motor controller 22, the work motor controller 23, and the generator controller 24 may each communicate with a vehicle controller VCU in the travel work machine. The whole vehicle controller VCU can respectively control the working states of the traveling motor 20, the working motor 21 and the generator 18 and the working states of the engine 17 through the traveling motor controller 22, the working motor controller 23 and the generator controller 24 based on the identification of the current power demand, the power battery SOC value, the driver operation working condition and the like, and also control the engagement or separation of the conversion synchronizer 4 and the speed change synchronizer 13 and the related idler gears, so that overall control is carried out on the 8 power modes, the optimal working mode matching under the current traveling or working condition is realized, and the whole energy consumption is reduced.

In addition, referring to fig. 2, a PDU25 (i.e., pow17r Distri19ution Unit, a power distribution unit (also called a high-voltage distribution box)) may be further provided in the hybrid system, and the PDU25 is used to connect the running motor controller 22, the working motor controller 23, the generator controller 24, and the power battery 19, respectively, so as to control and distribute power to the controllers and the power battery 19 in a centralized manner.

The third exemplary embodiment of the present invention also provides a walking working machine, which includes a working mechanism, a walking mechanism and the above hybrid power system, wherein the working mechanism can be in transmission connection with the working power output shaft 8 through the PTO26 and the like, and the walking mechanism (such as wheels, tracks and the like) is in transmission connection with the walking power output shaft 9.

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (12)

1. A hybrid powertrain, comprising:

The power coupling box comprises a shell (2), and a power shaft assembly and a transmission assembly which are arranged in the shell (2), wherein the power shaft assembly comprises a working power input shaft (1), a working power output shaft (8), a walking power input shaft (16) and a walking power output shaft (9), and the transmission assembly comprises a working transmission mechanism arranged between the working power input shaft (1) and the working power output shaft (8), a walking transmission mechanism arranged between the walking power input shaft (16) and the walking power output shaft (9) and a conversion transmission mechanism capable of transmitting power on the working power input shaft (1) to the walking power input shaft (16); and

The power input assembly comprises an engine (17), a generator (18), a power battery (19), a working motor (21) and a traveling motor (20), wherein the engine (17), the generator (18) and the power battery (19) are sequentially connected, and the working motor (21) and the traveling motor (20) are respectively connected with the power battery (19);

The working motor (21) is connected with the working power input shaft (1), the walking motor (20) is connected with the walking power input shaft (16), and the engine (17), the working motor (21) and the walking motor (20) are started and stopped independently.

2. Hybrid system according to claim 1, characterized in that the conversion transmission comprises a conversion idler gear (3) and a conversion socket gear (10) which are meshed with each other, the operation transmission comprises a working idler gear (5) and a working socket gear (6) which are meshed with each other, the transmission assembly further comprises a conversion synchronizer (4);

The operation idler gear (5) and the conversion idler gear (3) are sleeved on the operation power input shaft (1) at intervals along the axial direction, the conversion sleeve gear (10) is sleeved on the walking power input shaft (16), the operation sleeve gear (6) is sleeved on the operation power output shaft (8), and the conversion synchronizer (4) is sleeved on the operation power input shaft (1) and can be alternatively connected with the operation idler gear (5) and the conversion idler gear (3).

3. Hybrid system according to claim 2, characterized in that it comprises a travel motor-only travel mode, in which the engine (17), the generator (18), the working motor (21) are all shut down, the power battery (19) driving the travel motor (20) in operation, so that the travel motor (20), the travel power input shaft (16), the travel transmission and the travel power output shaft (9) are sequentially driven.

4. Hybrid system according to claim 2, characterized in that it comprises a work motor-only walking mode in which the engine (17), the generator (18), the walking motor (20) are all shut down, the power battery (19) drives the work motor (21) to run, the conversion synchronizer (4) is engaged with the conversion idler gear (3) such that the work motor (21), the work power input shaft (1), the conversion synchronizer (4), the conversion idler gear (3), the conversion socket gear (10), the walking power input shaft (16), the walking transmission mechanism and the walking power output shaft (9) are sequentially driven.

5. Hybrid system according to claim 2, characterized in that it comprises a two-motor-only travel mode, in which both the engine (17) and the generator (18) are deactivated, the power battery (19) drives the working motor (21) and the travel motor (20) in operation, the conversion synchronizer (4) is engaged with the conversion idler gear (3) such that the travel power input shaft (16) couples power from the working motor (21) and the travel motor (20) and transmits the coupled power to the travel power output shaft (9) through the travel gear.

6. Hybrid system according to claim 2, characterized in that it comprises a two-motor-only operating mode in which both the engine (17) and the generator (18) are deactivated, the power battery (19) driving the operating motor (21) and the travelling motor (20) in operation, the conversion synchronizer (4) being engaged with the operating idler gear (5) such that the operating motor (21), the operating power input shaft (1), the conversion synchronizer (4), the operating idler gear (5), the operating socket gear (6), the operating power output shaft (8) are driven in sequence and such that the travelling motor (20), the travelling power input shaft (16), the travelling transmission and the travelling power output shaft (9) are driven in sequence.

7. Hybrid system according to claim 2, characterized in that it comprises a travel motor-up Cheng Hangzou mode, in which the working motor (21) is stopped, the engine (17), the generator (18), the power battery (19) and the travel motor (20) are all operated, so that the travel motor (20), the travel power input shaft (16), the travel transmission and the travel power output shaft (9) are sequentially driven.

8. Hybrid system according to claim 2, characterized in that it comprises a work motor increase Cheng Hangzou mode, in which the travel motor (20) is stopped, the engine (17), the generator (18), the power battery (19) and the work motor (21) are all running, the conversion synchronizer (4) is engaged with the conversion idler gear (3), so that the work motor (21), the work power input shaft (1), the conversion synchronizer (4), the conversion idler gear (3), the conversion socket gear (10), the travel power input shaft (16), the travel transmission and the travel power output shaft (9) are sequentially driven.

9. The hybrid system according to claim 2, characterized in that the hybrid system includes a two-motor step-up Cheng Hangzou mode in which the engine (17), the generator (18), the power battery (19), the work motor (21), and the travel motor (20) are all operated, and the conversion synchronizer (4) is engaged with the conversion idler gear (3) such that the travel power input shaft (16) couples power from the work motor (21) and the travel motor (20) and transmits the coupled power to the travel power output shaft (9) through the travel transmission mechanism.

10. Hybrid system according to claim 2, characterized in that it comprises a dual motor extended range mode of operation, in which the engine (17), the generator (18), the power battery (19), the work motor (21) and the travel motor (20) are all operated, the conversion synchronizer (4) being engaged with the work idler gear (5) such that the work motor (21), the work power input shaft (1), the conversion synchronizer (4), the work idler gear (5), the work socket gear (6), the work power output shaft (8) are sequentially driven and such that the travel motor (20), the travel power input shaft (16), the travel transmission mechanism and the travel power output shaft (9) are sequentially driven.

11. Hybrid system according to any one of claims 1 to 10, characterized in that the working power input shaft (1), the working power output shaft (8), the walking power input shaft (16) and the walking power output shaft (9) are arranged at intervals in parallel in sequence in a first direction, the working motor (21) and the walking motor (20) being coaxially connected with the working power input shaft (1) and the walking power input shaft (16), respectively, in a second direction perpendicular to the first direction, the engine (17) being coaxially connected with the generator (18) in the first direction.

12. A walking machine, comprising:

the hybrid system according to any one of claims 1 to 11;

the operation mechanism is in transmission connection with the operation power output shaft (8); and

The walking mechanism is in transmission connection with the walking power output shaft (9).