Fracturing equipment

Abstract

The utility model discloses fracturing equipment, and relates to the fields of oil gas, mine equipment and the like. Fracturing equipment comprises an engine, a first clutch, a gearbox, a second clutch, a motor and / or a generator and a fracturing pump. The gearbox is provided with an input end, at least one connecting end and an output end; the engine is connected with the input end through the first clutch; the motor and / or the generator are / is connected with the corresponding connecting end through the second clutch; and the output end is connected with the fracturing pump. The problems that in the prior art, fracturing equipment is limited in use scene, poor in economical efficiency and the like can be solved.

Description

Technical Field

[0001] This application belongs to the field of oil and gas equipment technology, specifically relating to a fracturing device. Background Technology

[0002] With the development of fracturing equipment, fracturing equipment powered by turbine engines and electric motors has emerged, distinct from traditional diesel-powered systems. Turbine fracturing, powered by a turbine engine, can drive the fracturing pump entirely on natural gas, while electric fracturing, powered by an electric motor, can drive the pump entirely on electricity. This allows for the large-scale application of natural gas and electricity in fracturing operations, significantly reducing fuel costs and promoting the technological development and commercial application of turbine and electric fracturing.

[0003] However, due to limitations in the supply of natural gas and electricity, not all fracturing sites are suitable for turbine fracturing or electric fracturing. This creates conditions for the continued application of diesel fracturing. However, diesel fracturing still faces the problem of high fuel economy. In some well sites, even if natural gas or electricity is available, diesel fracturing cannot be used. Utility Model Content

[0004] The purpose of this application is to provide a fracturing device that can solve the problems of limited application scenarios and poor economic efficiency of fracturing devices in related technologies.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application provides a fracturing device, including: an engine, a first clutch, a gearbox, a second clutch, an electric motor and / or a generator, and a fracturing pump;

[0007] The gearbox is provided with an input end, at least one connection end, and an output end;

[0008] The engine is connected to the input end via the first clutch;

[0009] The electric motor and / or the generator are connected to the corresponding connection end via the second clutch;

[0010] The output terminal is connected to the fracturing pump.

[0011] The fracturing equipment in this embodiment can be driven by an engine to move a gearbox. When there is external power at the fracturing well site, the first clutch between the engine and the gearbox can be disengaged, allowing the gearbox to be driven by an electric motor. The gearbox then transmits power to the fracturing pump for fracturing operations. Alternatively, the electric motor on the gearbox can be replaced with or used as a generator, allowing the engine to drive the generator mounted on the gearbox to generate electricity. Based on the above configuration, the fracturing equipment in this embodiment can switch between different operating modes to meet fracturing needs in various scenarios. Furthermore, a hybrid mode can be formed through the cooperation of the engine and the electric motor. In addition, when there is no external power, the engine can be used as the power source; when there is external power, the engine can be shut off, and the electric motor on the gearbox can be used instead, allowing two different power sources to drive the fracturing pump. This "fuelable and externally powered" multi-mode capability improves the equipment's adaptability to various operating conditions. In particular, when external power is selected, it significantly improves economy and greatly reduces fuel costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the fracturing equipment disclosed in the embodiments of this application;

[0013] Figure 2 This is a schematic diagram of the gearbox disclosed in an embodiment of this application;

[0014] Figure 3 This is a schematic diagram of the gearbox in first gear as disclosed in an embodiment of this application;

[0015] Figure 4 This is a schematic diagram of the gearbox in second gear as disclosed in an embodiment of this application.

[0016] Explanation of reference numerals in the attached figures:

[0017] 10-Engine;

[0018] 20 - First clutch;

[0019] 30-Gearbox; 31-Box housing; 32-Input mechanism; 321-Input shaft; 3211-Input end; 322-Input gear; 33-Output mechanism; 331-Output shaft; 3311-Output end; 34-Shifting mechanism; 35-Transmission mechanism; 351-Connecting shaft; 3511-Connecting end; 352-First gear; 353-Second gear; 354-Third gear;

[0020] 40-Integrated electric generator;

[0021] 50-Fracturing pump;

[0022] 60 - Drive shaft. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0025] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific examples and application scenarios.

[0026] refer to Figures 1 to 4 This application discloses a fracturing device, which includes an engine 10, a first clutch 20, a gearbox 30, a second clutch (not shown in the figure), an electric motor and / or a generator, and a fracturing pump 50.

[0027] Among them, engine 10 is a power component that can provide driving force for fracturing pump 50; first clutch 20 and second clutch are used to realize the transmission engagement or disengagement between the mechanisms respectively; gearbox 30 can transmit power and meet the transmission ratio requirements; electric motor is used to provide driving force for fracturing pump 50; generator is used to generate electricity when receiving power; fracturing pump 50 is the core component of fracturing operation, which is used to pump fracturing fluid to meet the needs of fracturing operation.

[0028] refer to Figure 1 and Figure 2 To achieve power transmission, the gearbox 30 may be provided with an input end 3211, at least one connection end 3511 and an output end 3311, with the output end 3311 connected to the fracturing pump 50.

[0029] In this configuration, the engine 10 is connected to the input terminal 3211 via the first clutch 20. When the first clutch 20 is engaged, the engine 10, as a power source, can transmit power to the transmission 30 to drive its operation. In this case, the connection terminal 3511 can be used for power output. When the first clutch 20 is disengaged, the power output from the engine 10 cannot be transmitted to the transmission 30. In this case, an electric motor can be used as a power source to drive the transmission 30, and the connection terminal 3511 can be used for power input. In short, the connection terminal 3511 can be selected for either power input or power output depending on the power source.

[0030] The aforementioned electric motor and / or generator can be connected to the corresponding connection end 3511 via the second clutch. Thus, when the second clutch is engaged, the electric motor and / or generator can be driven by the gearbox 30 to facilitate power transmission; when the second clutch is disengaged, the electric motor and / or generator can be driven away from the gearbox 30, thereby preventing power transmission between them.

[0031] Optionally, when the fracturing equipment includes an electric motor, the electric motor and the gearbox 30 are connected via a second clutch. Based on this, when the first clutch 20 is disengaged and the second clutch is engaged, the electric motor can drive the gearbox 30, thereby transmitting the power output of the electric motor to the fracturing pump 50 to drive its operation. When the first clutch 20 is engaged and the second clutch is disengaged, the engine 10 can drive the gearbox 30, thereby transmitting the power output of the engine 10 to the fracturing pump 50 to drive its operation. When both the first clutch 20 and the second clutch are engaged, the engine 10 and the electric motor can respectively transmit power to the gearbox 30 to drive it, thereby transmitting the power output of the engine 10 and the electric motor to the fracturing pump 50 to drive its operation. This increases the operating power of the fracturing pump 50 and improves the efficiency of fracturing operations.

[0032] It should be noted that in all three modes mentioned above, the transmission 30 is not in neutral to facilitate power transmission.

[0033] When the fracturing equipment includes a generator, the generator and gearbox 30 are connected via a second clutch. Based on this, with the first clutch 20 engaged, the second clutch engaged, and the gearbox 30 in neutral, the power output from the engine 10 is transmitted to the generator via the gearbox 30, thus generating electricity. In this state, the fracturing pump 50 stops operating. Of course, the gearbox 30 can also be in a non-neutral state; in this case, the engine 10 can provide power to both the fracturing pump 50 and the generator.

[0034] The fracturing equipment in this embodiment can be driven by an engine 10 to move a gearbox 30, or by an electric motor to drive the gearbox 30, or by both the engine 10 and the electric motor to drive the gearbox 30. Power is then transmitted to the fracturing pump 50 via the gearbox 30 to perform fracturing operations. Additionally, the engine 10 can also drive a generator to generate electricity. Based on these settings, the fracturing equipment in this embodiment can switch between different operating modes to meet the fracturing needs of various scenarios. Furthermore, a hybrid mode can be used to drive the fracturing pump 50, improving economic efficiency while providing sufficient power.

[0035] Optionally, engine 10 can be a fuel engine, such as a diesel engine, or a gas engine. Based on this, the fracturing equipment in this embodiment can achieve a fuel-based driving mode, a gas-based fuel-based driving mode, and an external power mode, thereby improving the multi-condition adaptability of the fracturing equipment. In particular, when selecting the gas or external power mode, fuel costs can be significantly reduced, and economic efficiency can be greatly improved.

[0036] refer to Figures 2 to 4 In some embodiments, there can be multiple connection ends 3511. A portion of these connection ends 3511 is connected to the electric motor via a second clutch, and another portion is connected to the generator via the same second clutch. Based on this configuration, the fracturing equipment in this embodiment can both drive the fracturing pump 50 by transmitting power from the electric motor to the gearbox 30 and drive the generator to generate electricity by transmitting power from the gearbox 30 to the generator. It should be noted that the power transmission path of the gearbox 30 can be switched by controlling the on / off states of the first clutch 20, the second clutch, and the gear positions of the gearbox 30, thereby meeting the needs of different operating conditions.

[0037] In some more specific embodiments, the motor and generator can be an integrated electric generator 40. Based on this, the corresponding integrated electric generator 40 can be connected to at least one connection end 3511, so that the working state of the integrated electric generator 40 can be switched according to the needs of the actual working conditions.

[0038] For example, when the fracturing pump 50 needs to reduce energy consumption or increase operating power, the integrated electric generator 40 can switch to generator mode. In this mode, the integrated electric generator 40 can drive the gearbox 30 independently, or the integrated electric generator 40 and the engine 10 can jointly drive the gearbox 30. When charging is required, the integrated electric generator 40 can switch to generator mode. In this mode, the gearbox 30 can transfer some or all of the power output from the engine 10 to the integrated electric generator 40 to generate electricity.

[0039] Continue to refer to Figures 2 to 4 In some embodiments, the gearbox 30 may include a housing 31, an input mechanism 32, an output mechanism 33, a shifting mechanism 34, and a transmission mechanism 35. The housing 31 is a basic component that provides a mounting base for the input mechanism 32, the output mechanism 33, the shifting mechanism 34, the transmission mechanism 35, etc.

[0040] The input mechanism 32 can be disposed inside the housing 31, and the input mechanism 32 has an input end 3211 that extends out of the housing 31 and is rotatable relative to the housing 31 so as to facilitate a transmission connection with the first clutch 20 through the input end 3211.

[0041] The output mechanism 33 can be disposed inside the housing 31, and the output mechanism 33 has an output end 3311 that extends out of the housing 31 and is rotatable relative to the housing 31, so as to facilitate a drive connection with the fracturing pump 50 through the output end 3311.

[0042] The shift mechanism 34 can be housed within the housing 31 and is movable relative to the housing 31 so that the shift mechanism 34 can be connected to the input mechanism 32 or the transmission mechanism 35; in addition, the output mechanism 33 is also connected to the shift mechanism 34.

[0043] The transmission mechanism 35 is disposed within the housing 31 and has a connecting end 3511 that extends out of and is rotatable relative to the housing 31, so as to facilitate transmission connection with a motor and / or generator via the connecting end 3511. In addition, the transmission mechanism 35 is also connected to the input mechanism 32.

[0044] Based on the above configuration, the power output by the engine 10 can be transmitted to the gearbox 30 via the input mechanism 32. When the shift mechanism 34 is connected to the input mechanism 32, the power received by the input mechanism 32 from the engine 10 can be directly transmitted from the input mechanism 32 to the shift mechanism 34, and then from the shift mechanism 34 to the output mechanism 33, and finally from the output mechanism 33 to the fracturing pump 50 to drive the fracturing pump 50 to operate.

[0045] When the shift mechanism 34 is connected to the transmission mechanism 35, the power received by the input mechanism 32 from the engine 10 can first be transmitted from the input mechanism 32 to the transmission mechanism 35, and then from the transmission mechanism 35 to the output mechanism 33 through the shift mechanism 34, and finally from the output mechanism 33 to the fracturing pump 50 to drive the fracturing pump 50 to operate.

[0046] Of course, the power output by the electric motor can also be transmitted to the output mechanism 33 via the transmission mechanism 35, so as to drive the fracturing pump 50 to operate.

[0047] In some embodiments, the input mechanism 32 may include an input shaft 321 and an input gear 322 connected together, with the shaft end of the input shaft 321 being the input end 3211. Optionally, the side wall of the housing 31 may be provided with a first port, through which the input shaft 321 passes out of the housing 31, and a bearing may also be provided between the input shaft 321 and the first port; the input gear 322 is sleeved on the outer periphery of the input shaft 321 and connected to the input shaft 321 by a key. Of course, the input gear 322 may also be fixed to the end of the input shaft 321 opposite to the input end 3211, for example, the input gear 322 may be welded to the end of the input shaft 321.

[0048] Furthermore, the shift mechanism 34 can be engaged with the input gear 322. Optionally, the side of the input gear 322 in the axial direction of the shift mechanism 34 may also be provided with a first engagement portion, and the shift mechanism 34 can be engaged or disengaged with the first engagement portion in a transmission manner, so as to enable the shift mechanism 34 to be engaged or disengaged with the input mechanism 32 in a transmission manner.

[0049] The output mechanism 33 may include an output shaft 331, the shaft end of which is an output end 3311. The output shaft 331 is connected to the shifting mechanism 34 and the fracturing pump 50 respectively. Optionally, the side wall of the housing 31 may be provided with a second port, through which the output shaft 331 extends out of the housing 31, and a bearing may be provided between the output shaft 331 and the second port.

[0050] The transmission mechanism 35 may include a first gear 352, a connecting shaft 351, a second gear 353, and a third gear 354. The shaft end of the connecting shaft 351 is a connecting end 3511. Both the first gear 352 and the second gear 353 are located on the connecting shaft 351. Optionally, both the first gear 352 and the second gear 353 may be sleeved on the outside of the connecting shaft 351 and connected by keys. In addition, the shifting mechanism 34 may also be combined with the third gear 354.

[0051] The first gear 352 meshes with the input gear 322, and the second gear 353 meshes with the third gear 354. The third gear 354 is rotatably mounted on the output shaft 331. Therefore, when the shifting mechanism 34 is disengaged from the input gear 322 and engaged with the third gear 354, the power input from the input shaft 321 can be transmitted to the first gear 352 via the input gear 322. The first gear 352 then transmits the power to the second gear 353 via the connecting shaft 351, and the second gear 353 transmits the power to the third gear 354. The third gear 354 then transmits the power to the shifting mechanism 34, which then transmits the power to the output shaft 331, and finally to the fracturing pump 50 via the output shaft 331.

[0052] When the shift mechanism 34 is engaged with the third gear 354 and disengaged from the input gear 322, the power input from the input shaft 321 can be transmitted to the shift mechanism 34 via input processing, and then transmitted to the output shaft 331 by the shift mechanism 34, ultimately driving the fracturing pump 50 to operate.

[0053] like Figure 2 As shown, the shift mechanism 34 is in neutral, and the gearbox 30 cannot transmit power to the fracturing pump 50.

[0054] like Figure 3 As shown, the shift mechanism 34 is in first gear, meaning it is engaged with the third gear 354. In this case, the power transmission path is as follows: power from the engine 10 is input through the input shaft 321, sequentially passing through the input gear 322, the first gear 352, the connecting shaft 351, the second gear 353, the third gear 354, the shift mechanism 34, and the output shaft 331, finally being transmitted to the fracturing pump 50 via the output shaft 331. Additionally, when the connecting end 3511 is used for power output, it can drive a generator to generate electricity; when the connecting end 3511 is used for power input, the electric motor can provide power to the gearbox 30 and, together with the engine 10, drive the gearbox 30 to operate. Figure 4 As shown, the shift mechanism 34 is in second gear, meaning it is engaged with the input gear 322. In this state, the power transmission path is as follows: power from the engine 10 is input through the input shaft 321, passes sequentially through the input gear 322, the shift mechanism 34, and the output shaft 331, and is finally transmitted to the fracturing pump 50 via the output shaft 331. Additionally, when the connection end 3511 is used for power output, it can drive a generator to generate electricity; when the connection end 3511 is used for power input, the electric motor can provide power to the gearbox 30 and, together with the engine 10, drive the gearbox 30 to operate.

[0055] In some more specific embodiments, the two ends of the connecting shaft 351 extend out of the housing 31, so that the two ends of the connecting shaft 351 can be connected to the motor or the generator through the second clutch, or one end can be connected to the motor and the other end can be connected to the generator, and different operating modes can be switched by engaging or disengaging the second clutch at each end.

[0056] For example, when both ends of the connecting shaft 351 are engaged, the connecting shaft 351 is connected to the motors at both ends respectively, so that the connecting shaft 351 can be driven to rotate simultaneously by the motors at both ends, thereby increasing the driving force; or, when both ends of the connecting shaft 351 are engaged, the connecting shaft 351 is connected to the generators at both ends respectively, so that the connecting shaft 351 can drive two generators to operate simultaneously, thereby improving the power generation efficiency; or, the second clutch at one end of the connecting shaft 351 is engaged, and the second clutch at the other end is disengaged, with both ends of the connecting shaft 351 connected to the motor and the generator respectively. In this way, when the motor starts, the generator can be disconnected from the connecting shaft 351 by the second clutch, and when the generator starts, the motor can be disconnected from the connecting shaft 351 by the second clutch, thereby preventing motion interference.

[0057] refer to Figures 2 to 4 In some embodiments, the gearbox 30 may include multiple transmission mechanisms 35 arranged circumferentially around the gearbox 30. Based on this, more electric motors can be connected to achieve multiple power inputs to the gearbox 30, thereby transmitting greater drive power to the fracturing pump 50 and increasing fracturing operation power; or multiple power outputs can be achieved to drive more generators for power generation, thereby increasing power output.

[0058] refer to Figure 1 In some embodiments, the fracturing equipment may further include a drive shaft 60, one end of which is connected to the output end 3311, and the other end of which is connected to the fracturing pump 50. Based on this, power can be transmitted between the gearbox 30 and the fracturing pump 50 via the drive shaft 60 to drive the fracturing pump 50. Optionally, the drive shaft 60 may be a single shaft; the drive shaft 60 may also be a splined shaft. Correspondingly, the output end 3311 of the gearbox 30 may be provided with a splined sleeve. The cooperation between the splined shaft and the splined sleeve enables both power transmission and axial length adjustment to adapt to different operating conditions.

[0059] Optionally, the engine 10 can be a reciprocating diesel engine or a reciprocating gas engine, depending on the actual needs.

[0060] It should be noted that in this embodiment, the fracturing pump 50 can be driven by both the electric motor and the engine 10. The load on the engine 10 can be gradually increased or decreased by preloading or preloading the electric motor, which can effectively alleviate the problem of automatic shutdown of the engine 10 caused by load impact. Thus, the reciprocating engine 10 is more suitable for fracturing equipment.

[0061] In some other embodiments, the transmission 30 may be a gearbox. It should be noted that the transmission 30 may or may not have a shifting function. When the transmission 30 does not have a shifting function (i.e., the transmission 30 has only one gear ratio), it can be regarded as a gearbox.

[0062] In this embodiment of the application, when the motor and generator are an integrated electric generator 40, its working principle is as follows:

[0063] With the first clutch 20 engaged, the second clutch engaged, and the gearbox 30 in non-neutral state, the engine 10 can drive the fracturing pump 50 to operate via the first clutch 20 and the gearbox 30; in addition, the working mode of the electric generator 40 can be switched according to actual needs.

[0064] With the first clutch 20 engaged, the second clutch engaged, and the gearbox 30 in non-neutral state, the engine 10 and the integrated electric generator 40 can jointly drive the fracturing pump 50 through the gearbox 30.

[0065] With the first clutch 20 engaged, the second clutch engaged, and the gearbox 30 in neutral, the engine 10 can drive the integrated electric generator 40 through the first clutch 20 and the gearbox 30 to generate electricity.

[0066] With the first clutch 20 disengaged, the second clutch engaged, and the gearbox 30 in non-neutral position, the electric generator 40 can drive the fracturing pump 50 through the gearbox 30. At this time, the engine 10 can be turned off.

[0067] Based on the different modes described above, embodiments of this application can enable the engine 10 to operate in the optimal fuel economy range, or, when there is electricity at the work site, the engine 10 can be shut down and the fracturing pump 50 can be driven by electricity instead, thereby significantly reducing fuel costs.

[0068] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A fracturing apparatus, characterized by, The utility model relates to an engine (10), a first clutch (20), a gearbox (30), a second clutch, a motor and / or a generator and a fracturing pump (50). The gearbox (30) is provided with an input end (3211), at least one connecting end (3511) and an output end (3311); The engine (10) is connected with the input end (3211) through the first clutch (20); The motor and / or the generator are connected with the corresponding connecting end (3511) through the second clutch; The output end (3311) is connected with the fracturing pump (50). The connecting end (3511) is multiple; 2. The fracturing apparatus of claim 1, wherein, Part of the multiple connecting ends (3511) is connected with the motor through the second clutch, and another part of the multiple connecting ends (3511) is connected with the generator through the second clutch. The gearbox (30) comprises a box body (31) and an input mechanism (32), an output mechanism (33), a shifting mechanism (34) and a transmission mechanism (35) arranged in the box body (31) respectively; 3. The fracturing apparatus of claim 1, wherein, The input mechanism (32) has the input end (3211) extending out of the box body (31) and rotatable relative to the box body (31); The output mechanism (33) has the output end (3311) extending out of the box body (31) and rotatable relative to the box body (31), and the output mechanism (33) is connected with the shifting mechanism (34); The shifting mechanism (34) is movable relative to the box body (31) to connect the shifting mechanism (34) with the input mechanism (32) or the transmission mechanism (35); The transmission mechanism (35) is connected with the input mechanism (32), and the transmission mechanism (35) has the connecting end (3511) extending out of the box body (31) and rotatable relative to the box body (31). The input mechanism (32) comprises an input shaft (321) and an input gear (322) connected with each other, and the shaft end of the input shaft (321) is the input end (3211); 4. The fracturing apparatus of claim 3, wherein, The output mechanism (33) comprises an output shaft (331), and the shaft end of the output shaft (331) is the output end (3311); the output shaft (331) is connected with the shifting mechanism (34) and the fracturing pump (50) respectively; The transmission mechanism (35) comprises a first gear (352), a connecting shaft (351), a second gear (353) and a third gear (354); the shaft end of the connecting shaft (351) is the connecting end (3511); the first gear (352) and the second gear (353) are arranged on the connecting shaft (351); the first gear (352) is engaged with the input gear (322); the second gear (353) is engaged with the third gear (354); and the third gear (354) is rotatably arranged on the output shaft (331); The shifting mechanism (34) can be combined with the input gear (322) or the third gear (354). ​ 5. The fracturing apparatus of claim 4, wherein, Two ends of the connecting shaft (351) extend out of the box body (31) respectively.

6. The fracturing apparatus of any one of claims 3 to 5, wherein, The gearbox (30) comprises a plurality of transmission mechanisms (35), and the plurality of transmission mechanisms (35) are arranged along the circumference of the gearbox (30).

7. The fracturing apparatus of claims 1 or 4, wherein, The fracturing device further comprises a transmission shaft (60), one end of the transmission shaft (60) is connected with the output end (3311), and the other end of the transmission shaft (60) is connected with the fracturing pump (50).

8. The fracturing apparatus of claims 1 or 2, wherein, The motor and the generator are a motor-generator integrated machine (40).

9. The fracturing apparatus of claim 1, wherein, The engine (10) is a reciprocating diesel engine or a reciprocating gas engine.

10. The fracturing apparatus of claim 1, wherein, The gearbox (30) is a gear box.

11. The fracturing apparatus of claim 1, wherein, When the first clutch (20) is in the combined state, the engine (10) serves as a power source; when the first clutch (20) is in the disconnected state, the motor serves as a power source.

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