Power transmission system

Abstract

The application provides a power transmission system, comprising: an engine and a speed reduction mechanism in driving connection, the speed reduction mechanism having a first power output part and a second power output part; a speed regulation mechanism having a first power input part, a second power input part and a third power output part, the first power input part being selectively connected or disconnected with the first power output part, the second power input part being selectively connected or disconnected with the second power output part, and the third power output part being in driving connection with a structure to be driven; wherein the power transmission system has a first split-flow state, a second split-flow state and a combined-flow state. Through the technical scheme provided by the application, the problem that the output speed of the power transmission system is inconvenient to adjust in the prior art can be solved.

Description

Technical Field

[0001] This invention relates to the field of fracturing plunger pump drive technology, and more specifically, to a power transmission system. Background Technology

[0002] Currently, with the development of fracturing equipment technology, fracturing equipment powered by turbine engines has emerged. Compared with traditional diesel engines, turbine engines have many advantages, such as high power density per unit, the ability to use 100% natural gas as fuel to reduce fuel costs, and more environmentally friendly engine emissions.

[0003] However, the speed regulation methods of existing power transmission systems with turbine engines are relatively simple, and their speed regulation performance is often limited by the shape, size, weight, and other characteristics of the power transmission system. Therefore, using existing power transmission systems makes it inconvenient to adjust the output speed of the power transmission system according to the working requirements of the driven structure. Summary of the Invention

[0004] The main objective of this invention is to provide a power transmission system to solve the problem that it is inconvenient to adjust the output speed of the power transmission system in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a power transmission system is provided, comprising: an engine and a reduction mechanism, the engine being drivenly connected to the reduction mechanism, the reduction mechanism having a first power output portion and a second power output portion; a speed regulating mechanism having a first power input portion, a second power input portion, and a third power output portion, the first power input portion being selectively connected to or disconnected from the first power output portion, the second power input portion being selectively connected to or disconnected from the second power output portion, and the third power output portion being drivenly connected to a structure to be driven; wherein the power transmission system has a first split state, a second split state, and a confluence state; when the power transmission system is in the first split state, the first power input portion is connected to the first power output portion, and the second power input portion is disconnected from the second power output portion; when the power transmission system is in the second split state, the first power input portion is disconnected from the first power output portion, and the second power input portion is connected to the second power output portion; when the power transmission system is in the confluence state, the first power input portion is connected to the first power output portion, and the second power input portion is connected to the second power output portion.

[0006] Furthermore, the speed regulating mechanism includes a gear speed regulating structure; and / or, the speed reduction mechanism includes a gear speed reduction structure.

[0007] Furthermore, the speed regulating mechanism includes a first planetary gear structure and a speed regulating gear. The first planetary gear structure includes a first sun gear, a plurality of first planet gears, and a first ring gear that mesh sequentially. The first planetary gear structure also includes a rotatably mounted first planet gear support. The plurality of first planet gears are all connected to the first planet gear support. The speed regulating gear meshes with the outer periphery of the first ring gear. The speed regulating gear is provided with a first power input shaft, which forms a first power input section. The first sun gear is provided with a second power input shaft, which forms a second power input section. The first planet gear support is provided with a third power output shaft, which forms a third power output section.

[0008] Furthermore, the power transmission system also includes a speed change mechanism and a power cut-off mechanism, the power cut-off mechanism having a power connection state and a power cut-off state; the speed change mechanism is disposed between the first power input section and the first power output section, and the power cut-off mechanism is disposed between the second power input section and the second power output section; or, the speed change mechanism is disposed between the second power input section and the second power output section, and the power cut-off mechanism is disposed between the first power input section and the first power output section.

[0009] Furthermore, the power disconnection mechanism includes a clutch and a brake; when the power disconnection mechanism is in the power connection state, the clutch engages with the first power output unit or the second power output unit, and the brake is released; when the power disconnection mechanism is in the power disconnection state, the clutch disengages from the first power output unit or the second power output unit, and the brake applies the brake.

[0010] Furthermore, the transmission mechanism has a multi-gear structure, and the transmission mechanism has a multi-gear speed adjustment state and a neutral braking state; when the transmission mechanism is in the multi-gear speed adjustment state, the transmission mechanism is used to decelerate the first power output unit or the second power output unit.

[0011] Furthermore, the reduction mechanism includes: a second planetary gear structure, which includes a second sun gear, multiple second planet gears, and a second ring gear that mesh sequentially; the second planetary gear structure also includes a fixedly mounted second planet gear support, and the multiple second planet gears are all connected to the second planet gear support; a parallel gear structure, which includes a first parallel gear and a second parallel gear that mesh with each other; the second ring gear is connected to the first parallel gear through a transmission shaft to drive the first parallel gear to rotate; a first power output shaft is provided on the first parallel gear, forming a first power output part; and a second power output shaft is provided on the second parallel gear, forming a second power output part.

[0012] Furthermore, the speed change mechanism is a variable frequency motor.

[0013] Furthermore, the structure to be driven includes: a reduction module, with the third power output unit being driven to the power input end of the reduction module; and a plunger pump, with the power output end of the reduction module being driven to the plunger pump to drive the plunger pump to work.

[0014] Furthermore, the engine is a single-shaft turbine engine, a dual-shaft turbine engine, or a triple-shaft turbine engine.

[0015] By applying the technical solution of the present invention, by selectively connecting or disconnecting the first power input unit with the first power output unit, and selectively connecting or disconnecting the second power input unit with the second power output unit, the power transmission system can be switched to a first split state, a second split state, or a merging state. This facilitates corresponding state adjustments according to the specific working requirements of the structure to be driven, improves the speed regulation flexibility of the power transmission system, and makes it easier to adjust the output speed of the power transmission system according to the working requirements of the structure to be driven. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic diagram of a power transmission system according to Embodiment 1 of the present invention is shown;

[0018] Figure 2 A schematic diagram of a speed regulation structure provided according to Embodiment 1 of the present invention is shown;

[0019] Figure 3 A schematic diagram of a power cutting structure according to Embodiment 1 of the present invention is shown;

[0020] Figure 4 A schematic diagram of a deceleration structure according to Embodiment 1 of the present invention is shown;

[0021] Figure 5 A schematic diagram of the structure to be driven according to Embodiment 1 of the present invention is shown;

[0022] Figure 6 A schematic diagram of a power transmission system according to Embodiment 2 of the present invention is shown;

[0023] Figure 7 A schematic diagram of a power transmission system according to Embodiment 3 of the present invention is shown;

[0024] Figure 8 A schematic diagram of a power transmission system according to Embodiment 4 of the present invention is shown.

[0025] The above figures include the following reference numerals:

[0026] 10. Engine;

[0027] 20. Reduction mechanism; 21. Second planetary gear structure; 211. Second sun gear; 212. Second planetary gear; 213. Second gear ring; 214. Second planetary gear support; 22. Parallel gear structure; 221. First parallel gear; 222. Second parallel gear; 23. First power output shaft; 24. Second power output shaft;

[0028] 30. Speed ​​regulating mechanism; 31. First planetary gear structure; 32. Speed ​​regulating gear; 311. First sun gear; 312. First planetary gear; 313. First gear ring; 314. First planetary gear support; 33. First power input shaft; 34. Second power input shaft; 35. Third power output shaft;

[0029] 40. Speed ​​change mechanism;

[0030] 50. Power cut-off mechanism; 51. Clutch; 52. Brake;

[0031] 60. Structure to be driven; 61. Reduction module; 62. Piston pump. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figures 1 to 5 As shown, an embodiment of the present invention provides a power transmission system, which includes an engine 10, a reduction mechanism 20, and a speed regulating mechanism 30. The engine 10 is drivenly connected to the reduction mechanism 20, and the reduction mechanism 20 has a first power output section and a second power output section. The speed regulating mechanism 30 has a first power input section, a second power input section, and a third power output section. The first power input section can be selectively connected to or disconnected from the first power output section, the second power input section can be selectively connected to or disconnected from the second power output section, and the third power output section is drivenly connected to the structure 60 to be driven. The power transmission system has a first split state, a second split state, and a merging state. When the power transmission system is in the first split state, the first power input section is connected to the first power output section, and the second power input section is disconnected from the second power output section. When the power transmission system is in the second split state, the first power input section is disconnected from the first power output section, and the second power input section is connected to the second power output section. When the power transmission system is in the merging state, the first power input section is connected to the first power output section, and the second power input section is connected to the second power output section.

[0034] By selectively connecting or disconnecting the first power input unit from the first power output unit, and selectively connecting or disconnecting the second power input unit from the second power output unit, the power transmission system can switch between a first split state, a second split state, or a merging state. This facilitates adjustment of the output speed of the drive structure according to the specific working requirements of the driven structure 60, improving the speed regulation flexibility of the power transmission system. Therefore, the technical solution provided by this invention solves the technical problem in the prior art where it is inconvenient to adjust the output speed of the power transmission system.

[0035] In this embodiment, the speed regulating mechanism 30 includes a gear speed regulating structure. This results in a simple structure, stable transmission, and low manufacturing cost.

[0036] The reduction mechanism 20 includes a gear reduction structure. This results in a simple structure, stable transmission, and low manufacturing cost.

[0037] In this embodiment, the speed regulating mechanism 30 includes a first planetary gear structure 31 and a speed regulating gear 32. The first planetary gear structure 31 includes a first sun gear 311, a plurality of first planet gears 312, and a first ring gear 313 meshing sequentially. The first planetary gear structure 31 also includes a rotatably mounted first planet gear support 314. The plurality of first planet gears 312 are all connected to the first planet gear support 314. The speed regulating gear 32 meshes with the outer periphery of the first ring gear 313. The speed regulating gear 32 is provided with a first power input shaft 33, forming a first power input section; the first sun gear 311 is provided with a second power input shaft 34, forming a second power input section; and the first planet gear support 314 is provided with a third power output shaft 35, forming a third power output section.

[0038] Using the power transmission system provided in this embodiment, when the first power output shaft 23 is connected to the first power input shaft 33 and the second power output shaft 24 is disconnected from the second power input shaft 34, the first power input shaft 33 drives the speed regulating gear 32, the speed regulating gear 32 drives the first gear ring 313, and the first gear ring 313 drives the first planetary gear carrier 314 to output power. At this time, the power system is in the first split state. When the second power output shaft 24 is connected to the second power input shaft 34 and the first power output shaft 23 is disconnected from the first power input shaft 33, the second power input shaft 34 drives the sun gear, the sun gear drives the first planetary gear 312, thereby driving the first planetary gear carrier 314 to output power. At this time, the power system is in the second split state. When the first power output shaft 23 is connected to the first power input shaft 33, and the second power output shaft 24 is connected to the second power input shaft 34, the speed regulating gear 32 drives the first gear ring 313 to adjust the speed of the first planetary gear carrier 314. The power from the first power output shaft 23 and the second power output shaft 24 is ultimately output through the first planetary gear carrier 314, at which point the power system is in a confluence state. This embodiment, through the speed regulating gear 32 driven by the first power input shaft 33 and the first planetary gear driven by the second power input shaft 34, enables the power transmission system to adjust its state between the first split state, the second split state, and the confluence state, thus improving the speed regulation flexibility of the power transmission system.

[0039] In this embodiment, the power transmission system further includes a transmission mechanism 40 and a power cut-off mechanism 50, the power cut-off mechanism 50 having a power connection state and a power cut-off state. The transmission mechanism 40 is disposed between the first power input section and the first power output section, and the power cut-off mechanism 50 is disposed between the second power input section and the second power output section; or, the transmission mechanism 40 is disposed between the second power input section and the second power output section, and the power cut-off mechanism 50 is disposed between the first power input section and the first power output section.

[0040] The power transmission system provided in this embodiment allows for adjustments to the positions of the transmission mechanism 40 and the power cut-off mechanism 50. They can be positioned between the first power input and the first power output, between the second power input and the second power output, or between the second power input and the second power output, and between the first power input and the first power output. Specifically, the transmission mechanism 40 facilitates flexible speed adjustment, and the power cut-off mechanism 50 facilitates flexible power connection or switching. Thus, the power transmission system can not only adjust the state between the first split state, the second split state, and the merging state, but also adjust the positions of the transmission mechanism 40 and the power cut-off mechanism 50 according to different usage requirements, thereby further improving the speed regulation flexibility of the power transmission system.

[0041] In this embodiment, the power cut-off mechanism 50 includes a clutch 51 and a brake 52. When the power cut-off mechanism 50 is in a power-connected state, the clutch 51 engages with the first power output unit or the second power output unit, and the brake 52 releases the brake. When the power cut-off mechanism 50 is in a power-cut-off state, the clutch 51 disengages from the first power output unit or the second power output unit, and the brake 52 applies the brake. With this structural arrangement, when the clutch 51 is engaged or disengaged, forced braking of the engine can be effectively avoided. Especially for turbocharged engines, since the air compressor, combustion chamber, and compressor turbine of a turbocharged engine are all running, a large amount of hot gas is still discharged from the exhaust end of the turbocharged engine. After exiting the combustion chamber, this hot gas will still pass through the compressor turbine, driving the compressor turbine to rotate and thus driving the air compressor to run. This hot gas will pass through the power turbine to be discharged to the exhaust end. When this hot gas passes through the forcibly braked power turbine, the power turbine will still be subjected to the high temperature and pressure of the combustion gas, thereby affecting the service life of the turbocharged engine's power turbine. By adopting the above configuration, there is no need to forcibly brake the turbine engine, thus avoiding the aforementioned situation and effectively improving the service life of the power turbine.

[0042] In this embodiment, the transmission mechanism 40 has a multi-gear structure, with a multi-gear speed adjustment state and a neutral braking state. When the transmission mechanism 40 is in the multi-gear speed adjustment state, it is used to decelerate the first power output unit or the second power output unit. Thus, by switching the transmission mechanism 40 to the multi-gear speed adjustment state or the neutral braking state, it is convenient to perform multi-gear speed adjustment, or to disconnect the power on both sides of the transmission mechanism 40, thereby facilitating state adjustment between the first split state, the second split state, and the merging state. Furthermore, the positions of the transmission mechanism 40 and the power cut-off mechanism 50 can be adjusted according to different usage requirements, thereby improving the speed adjustment flexibility of the power transmission system.

[0043] In this embodiment, the reduction mechanism 20 includes a second planetary gear structure 21 and a parallel gear structure 22. The second planetary gear structure 21 includes a second sun gear 211, a plurality of second planet gears 212, and a second ring gear 213 that mesh sequentially. The second planetary gear structure 21 also includes a fixedly mounted second planet gear support 214, and the plurality of second planet gears 212 are all connected to the second planet gear support 214. The parallel gear structure 22 includes a first parallel gear 221 and a second parallel gear 222 that mesh with each other. The second ring gear 213 is connected to the first parallel gear 221 through a transmission shaft to drive the first parallel gear 221 to rotate. A first power output shaft 23 is provided on the first parallel gear 221, forming a first power output part. A second power output shaft 24 is provided on the second parallel gear 222, forming a second power output part.

[0044] Using the power transmission system provided in this embodiment, the power from the engine 10 enters the reduction mechanism 20 and sequentially drives the second sun gear 211, multiple second planetary gears 212, and the second ring gear 213 to rotate. The second ring gear 213 is connected to the first parallel gear 221 via a transmission shaft, driving the first parallel gear 221 to rotate. The first parallel gear 221 drives the second parallel gear 222, which meshes with it, to rotate, thereby outputting power through the first power output shaft 23 on the first parallel gear 221 and the second power output shaft 24 on the second parallel gear 222. In this way, the power of the engine 10 is split into two parts through the second planetary gear structure 21 and the parallel gear structure 22, which facilitates the adjustment of the corresponding splitting and merging states according to the specific working requirements of the driven structure 60, thereby improving the speed regulation flexibility of the power transmission system.

[0045] In this embodiment, the speed change mechanism 40 is a variable frequency motor. This allows for easy speed adjustment by changing the frequency of the variable frequency motor, and the transmission of the variable frequency motor is stable, facilitating stable speed regulation.

[0046] In this embodiment, the driven structure 60 includes a reduction module 61 and a plunger pump 62. A third power output unit is driven and connected to the power input end of the reduction module 61. The power output end of the reduction module 61 is driven and connected to the plunger pump 62 to drive the plunger pump 62. Thus, the reduction module 61 increases the power input to the plunger pump 62, thereby improving the working efficiency of the driven structure. With this structural configuration, the engine 10 can be a single-shaft turbine engine, a dual-shaft turbine engine, or a triple-shaft turbine engine. This allows for adjustment and selection of the power source according to different power requirements and usage scenarios, improving the speed regulation flexibility of the power transmission system and solving the technical problem in the prior art where it is difficult to make adaptive adjustments according to the working requirements of the driven structure 60.

[0047] Specifically, such as Figure 1 As shown, Embodiment 1 of the present invention provides a power transmission system, wherein the transmission mechanism 40 of the power transmission system is disposed between the first power input section and the first power output section, and the power cut-off mechanism 50 is disposed between the second power input section and the second power output section.

[0048] In this embodiment, when the power transmission system is in the first split state, the transmission mechanism 40 is in a multi-gear speed regulation state, which decelerates the first power output unit. The power cut-off mechanism 50 is in a power disconnect state, the clutch 51 disengages from the second power output unit, and the brake 52 applies the brakes. At this time, the power of the engine 10 is output from the first power output shaft 23 through the reduction mechanism 20, and then output to the first power input unit of the speed regulation mechanism 30 through the transmission mechanism 40. Subsequently, the first power input shaft 33 drives the speed regulation gear 32, and the speed regulation gear 32 drives the first gear ring 313, thereby driving the first planetary gear carrier 314, so as to output power through the third power output shaft 35 provided on the first planetary gear carrier 314, and finally drive the driven structure 60 to work.

[0049] In this embodiment, when the power transmission system is in the second split state, the transmission mechanism 40 is in neutral braking state, the power cut-off mechanism 50 is in power connection state, the clutch 51 is engaged with the second power output unit, and the brake 52 is released. At this time, the power of the engine 10 is output from the second power output unit through the reduction mechanism 20, and then output to the second power input unit of the speed regulating mechanism 30 through the power cut-off mechanism 50. The power input shaft 34 drives the first sun gear 311, which in turn drives the first planetary gear 312, thereby driving the first planetary gear carrier 314 and outputting power through the third power output shaft 35, ultimately driving the driven structure 60 to work.

[0050] In this embodiment, when the power transmission system is in the confluence state, the clutch 51 engages with the second power output unit, and the brake 52 is released. At this time, the power of the engine 10 is output from the second power output unit through the reduction mechanism 20, and then output to the second power input unit of the speed regulating mechanism 30 through the power cut-off mechanism 50. The second power input shaft 34 drives the first sun gear 311 to rotate, and the first sun gear 311 drives the first planetary gear 312, thereby driving the first planetary gear carrier 314 to move and outputting power through the third power output shaft 35. At the same time, the transmission mechanism 40 is in a multi-gear speed regulation state, reducing the speed of the first power output unit. The power of the engine 10 is output from the first power output shaft 23 through the reduction mechanism 20, and then output to the first power input unit of the speed regulating mechanism 30 through the transmission mechanism 40. The first power input shaft 33 drives the speed regulating gear 32, which drives the first gear ring 313, thereby driving the first planetary gear carrier 314 and regulating the speed of the first planetary gear carrier 314. In this way, the power of the engine 10 is split and then passes through the power cut-off mechanism 50 and the speed change mechanism 40 respectively. Then, it is combined through the first sun gear 311 and the speed regulating gear 32 of the speed regulating mechanism 30, and finally drives the structure 60 to be driven to work.

[0051] Specifically, such as Figure 6 As shown, Embodiment 2 of the present invention provides a power transmission system. The difference between the power transmission system in this embodiment and the power transmission system in Embodiment 1 is that the driven structure 60 includes a plunger pump 62, and the speed regulating mechanism 30 also includes a deceleration module 61, that is, the deceleration module 61 is part of the speed regulating mechanism 30.

[0052] Specifically, such as Figure 7 As shown, in Embodiment 3 of the present invention, the power cut-off mechanism 50 is disposed between the first power input part and the first power output part, and the speed change mechanism 40 is disposed between the second power input part and the second power output part.

[0053] In this embodiment, when the power transmission system is in the first split state, the transmission mechanism 40 is in the neutral braking state, the power cut-off mechanism 50 is in the power connection state, the clutch 51 is engaged with the first power output unit, the brake 52 is released, and the transmission mechanism 40 is in the neutral braking state. At this time, the power of the engine 10 is output from the first power output unit through the reduction mechanism 20, and then output to the first power input unit of the speed regulating mechanism 30 through the power cut-off mechanism 50. The power of the engine 10 is output from the first power output unit through the power cut-off mechanism 50, and then output to the first power input unit of the speed regulating mechanism 30. The first power input shaft 33 drives the speed regulating gear 32, the speed regulating gear 32 drives the first gear ring 313, thereby driving the first planetary gear carrier 314. The power is output through the third power output shaft 35 provided on the first planetary gear carrier 314, and finally drives the driven structure 60 to work.

[0054] In this embodiment, when the power transmission system is in the second split state, the transmission mechanism 40 is in a multi-gear speed regulation state, which decelerates the second power output unit. The power cut-off mechanism 50 is in a power disconnect state, the clutch 51 is disengaged from the first power output unit, and the brake 52 applies braking. At this time, the power of the engine 10 is output from the second power output unit through the reduction mechanism 20, and then output to the second power input unit of the speed regulation mechanism 30 through the transmission mechanism 40. The second power input shaft 34 drives the first sun gear 311, which drives the first planetary gear 312, thereby driving the first planetary gear carrier 314 and outputting power through the third power output shaft 35, ultimately driving the driven structure 60 to work.

[0055] In this embodiment, when the power transmission system is in a confluence state, the clutch 51 engages with the first power output unit, and the brake 52 releases the brake. At this time, the power of the engine 10 is output from the first power output unit through the reduction mechanism 20, and then output to the first power input unit of the speed regulating mechanism 30 through the power cut-off mechanism 50. The first power input shaft 33 drives the speed regulating gear 32, which drives the first gear ring 313 to regulate the speed of the first planetary gear carrier 314. At the same time, the transmission mechanism 40 is in a multi-gear speed regulation state, reducing the speed of the second power output unit. The power of the engine 10 is output from the second power output unit through the reduction mechanism 20, and then output to the second power input unit of the speed regulating mechanism 30 through the transmission mechanism 40. The second power input shaft 34 drives the first sun gear 311, which drives the first planetary gear 312, thereby driving the first planetary gear carrier 314 and outputting the power through the third power output shaft 35. In this way, the power of the engine 10 is split and then passes through the power cut-off mechanism 50 and the speed change mechanism 40 respectively. Then, it is combined through the first sun gear 311 and the speed regulating gear 32 of the speed regulating mechanism 30, and finally drives the structure 60 to be driven to work.

[0056] Specifically, the working principle of the speed regulating mechanism 30 is as follows: Power from upstream is input through the second input shaft, which drives the first sun gear 311 to rotate. The first sun gear 311 drives the first planet gear 312 to rotate, which in turn drives the first planet gear carrier 314 to rotate. The first planet gear carrier 314 drives the third power output shaft 35 to rotate. Additionally, the first ring gear 313 is driven by the speed regulating gear 32. Based on the single-row planetary gear set equation: n sun +αn annulus -(1+α)n carrier =0, where nsun is the rotational speed of the first sun gear 311; n annulus The rotational speed of the first gear ring is 313, n carrier Let α be the rotational speed of the first planetary gear carrier 314, and let z be the number of teeth of the first gear ring 313. annulus With the first sun gear having 311 teeth z sun The ratio, i.e., α=z annulus / z sun And α>1. Therefore, the rotational speed n of the first planetary gear carrier 314 is... carrier =(n sun +αn annulus ) / (1+α). Based on the above formula, when the first gear ring 313 has no rotational speed, that is, when the rotational speed of the first gear ring 313 is 0, the rotational speed n of the first planetary gear carrier 314 is... carrier =n sun / (1+α), that is, the rotational speed of the third power output shaft 35 is determined only by the speed ratio α between the first gear ring 313 and the first sun gear 311.

[0057] When the first power input shaft 33 rotates, it drives the speed regulating gear 32 to rotate, which in turn drives the first gear ring 313 to rotate. At this time, the rotational speed n of the first planetary gear carrier 314 is... carrier =(n sun +αn annulus ) / (1+α), so that when the speed of the first power input shaft 33 is the highest, which is the same as the speed of the first gear ring 313, the speed of the first planetary gear support 314, which is the same as the speed of the third power output shaft 35, reaches its maximum.

[0058] Specifically, such as Figure 8 As shown, Embodiment 4 of the present invention provides a power transmission system. The difference between the power transmission system in this embodiment and the power transmission system in Embodiment 3 is that the driven structure 60 includes a plunger pump 62, and the speed regulating mechanism 30 also includes a deceleration module 61, that is, the deceleration module 61 is part of the speed regulating mechanism 30.

[0059] From the above description, it can be seen that the embodiments of the present invention achieve the following technical effects: by selectively connecting or disconnecting the first power input unit from the first power output unit, and selectively connecting or disconnecting the second power input unit from the second power output unit, the power transmission system can be switched to a first split state, a second split state, or a merging state, thus achieving speed regulation requirements using different states; in the merging state, the speed of the third power output shaft 35 is adjusted through the first gear ring 313, improving the speed regulation flexibility of the power transmission system; by changing the first power input unit, the first power output unit, and the connecting components between the first power input unit and the second power output unit, the power output mode can also be changed, achieving different speed regulation requirements using different structures. In summary, the power drive system proposed in this application can adjust the state according to the specific working requirements of the driven structure, greatly improving the speed regulation flexibility of the power transmission system.

[0060] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0061] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0062] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0063] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0064] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A power transmission system, characterized in that, include: An engine (10) and a reduction mechanism (20) are provided, wherein the engine (10) is drivenly connected to the reduction mechanism (20), and the reduction mechanism (20) has a first power output section and a second power output section. The deceleration mechanism (20) includes: The second planetary gear structure (21) includes a second sun gear (211), a plurality of second planet gears (212), and a second ring gear (213) meshing in sequence. The second planetary gear structure (21) also includes a fixedly mounted second planet gear support (214), and the plurality of second planet gears (212) are all connected to the second planet gear support (214). A parallel gear structure (22) includes a first parallel gear (221) and a second parallel gear (222) that mesh with each other; a second gear ring (213) is connected to the first parallel gear (221) through a first power output shaft (23) to drive the first parallel gear (221) to rotate; the first power output shaft (23) forms the first power output part, and a second power output shaft (24) is provided on the second parallel gear (222), forming the second power output part; Speed ​​regulating mechanism (30) has a first power input part, a second power input part and a third power output part. The first power input part can be selectively connected to or disconnected from the first power output part, the second power input part can be selectively connected to or disconnected from the second power output part, and the third power output part is drivenly connected to the structure to be driven (60). The power transmission system has a first split state, a second split state, and a merging state. When the power transmission system is in the first split state, the first power input unit is connected to the first power output unit, and the second power input unit is disconnected from the second power output unit. When the power transmission system is in the second split state, the first power input unit is disconnected from the first power output unit, and the second power input unit is connected to the second power output unit. When the power transmission system is in the merging state, the first power input unit is connected to the first power output unit, and the second power input unit is connected to the second power output unit. The power transmission system also includes a speed change mechanism (40), which is disposed between the first power input section and the first power output section. In the first split state, the power of the engine (10) is output from the first power output shaft (23) through the speed reduction mechanism (20) and output to the first power input section of the speed regulating mechanism (30) through the speed change mechanism (40).

2. The power transmission system according to claim 1, characterized in that, The speed regulating mechanism (30) includes a gear speed regulating structure; and / or, The deceleration mechanism (20) includes a gear reduction structure.

3. The power transmission system according to claim 1, characterized in that, The speed regulating mechanism (30) includes a first planetary gear structure (31) and a speed regulating gear (32). The first planetary gear structure (31) includes a first sun gear (311), a plurality of first planet gears (312) and a first gear ring (313) meshing in sequence. The first planetary gear structure (31) also includes a rotatably disposed first planet gear support (314). The plurality of first planet gears (312) are all connected to the first gear ring (313). The speed regulating gear (32) meshes with the outer periphery of the first gear ring (313). The speed regulating gear (32) is provided with a first power input shaft (33), which forms the first power input part; the first sun gear (311) is provided with a second power input shaft (34), which forms the second power input part; the first gear ring (313) is provided with a third power output shaft (35), which forms the third power output part.

4. The power transmission system according to claim 1, characterized in that, The power transmission system also includes a power cut-off mechanism (50), which has a power connection state and a power cut-off state; The transmission mechanism (40) is disposed between the first power input section and the first power output section, and the power cut-off mechanism (50) is disposed between the second power input section and the second power output section; or, The transmission mechanism (40) is disposed between the second power input section and the second power output section, and the power cut-off mechanism (50) is disposed between the first power input section and the first power output section.

5. The power transmission system according to claim 4, characterized in that, The power cut-off mechanism (50) includes a clutch (51) and a brake (52); when the power cut-off mechanism (50) is in the power connection state, the clutch (51) engages with the first power output unit or the second power output unit, and the brake (52) releases the brake; when the power cut-off mechanism (50) is in the power cut-off state, the clutch (51) disengages from the first power output unit or the second power output unit, and the brake (52) applies the brake.

6. The power transmission system according to claim 4, characterized in that, The transmission mechanism (40) has a multi-gear structure and has a multi-gear speed adjustment state and a neutral braking state. When the transmission mechanism (40) is in the multi-gear speed adjustment state, the transmission mechanism (40) is used to decelerate the first power output unit or the second power output unit.

7. The power transmission system according to claim 1, characterized in that, The speed change mechanism (40) is a variable frequency motor.

8. The power transmission system according to claim 1, characterized in that, The structure to be driven (60) includes: The third power output unit is driven to the power input end of the deceleration module (61); The piston pump (62) is connected to the power output end of the deceleration module (61) to drive the piston pump (62) to work.

9. The power transmission system according to any one of claims 1 to 8, characterized in that, The engine (10) is a single-shaft turbine engine, a dual-shaft turbine engine, or a tri-shaft turbine engine.

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