Multi-gear power transmission device and method

Abstract

The invention belongs to the field of vehicles, and provides a multi-gear power transmission device and method. The planet row comprises a first sun gear and a first planet gear meshed with the first sun gear; the second planet gear is meshed with the first planet gear; the second sun gear is meshed with the second planet gear; the outer gear ring is meshed with the first planet gear; the planet carrier is connected with the first planet wheel and the second planet wheel; the outer gear ring is connected with wheels; one end of the third clutch is connected with the first sun gear; the other end is connected with the motor; the first brake is connected with the planet carrier; when the third clutch is connected and the first brake brakes, the planet carrier is fixed, power drives the first sun gear through the third clutch, the first sun gear drives the first planet gear, the first planet gear drives the outer gear ring to rotate reversely, and the outer gear ring drives the wheels to rotate reversely to form a reverse gear. The reverse gear device has the advantages that mechanical body reverse gear does not depend on reverse rotation of the motor for reverse gear, and the problem of reverse gear when the motor breaks down is solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a multi-speed power transmission device and method. Background Art

[0002] At this stage, the pure electric field is still facing great challenges due to the fact that the problem of battery endurance at low temperatures has not yet been solved, so hybrid power will be maintained for a long time.

[0003] At the same time, the existing hybrid system has a small number of gears and cannot meet the high performance and high economy indicators of the vehicle drive system. In terms of the current domestic hybrid technology development, due to the existence of motor drive, the mechanical body does not have a physical reverse gear function. The vehicle's reverse operation is completely dependent on the motor reversal. When the motor fails, the normal driving of the vehicle will be restricted, and there are also safety hazards. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a multi-speed power transmission device and method to solve the problem that the existing vehicle reverses relying on the motor reversal, so the reverse gear cannot be performed when the motor fails.

[0005] To solve the above technical problems, the present invention provides a multi-speed power transmission device, including: a motor; a planetary gear; the planetary gear includes: a first sun gear, a first planetary gear meshed with the first sun gear; a second planetary gear meshed with the first planetary gear; a second sun gear meshed with the second planetary gear; an outer ring gear meshed with the first planetary gear; a planetary carrier connecting the first planetary gear and the second planetary gear; the outer ring gear is used to connect the wheel; a first brake; the first brake is connected to the planetary carrier; a third clutch; one end of the third clutch is connected to the first sun gear; and the other end is connected to the motor; when the first brake is applied and the third clutch is engaged, the planetary carrier does not move, and power is transmitted to the first sun gear through the third clutch, driving the first sun gear to rotate, the first sun gear drives the first planetary gear to reverse, the first planetary gear drives the outer ring gear to reverse, so that the wheel reverses to achieve reverse gear.

[0006] In one embodiment, the multi-speed power transmission device further includes: an engine; the engine is connected to the rotor of the motor via a K0 clutch; and the power comes from the motor and / or the engine.

[0007] In one embodiment, the multi-speed power transmission device also includes: a first clutch; one end of the first clutch is connected to the second sun gear; the other end is connected to the motor; when the first clutch is engaged and the first brake is braked, the planetary carrier is stationary, and power is transmitted to the second sun gear through the first clutch, driving the second sun gear to rotate; the second sun gear drives the second planetary gear to rotate, the second planetary gear drives the first planetary gear to rotate forward, and the rotation of the first planetary gear drives the outer ring gear to rotate forward, so that the wheels rotate forward, realizing the 1st gear mode.

[0008] In one embodiment, the multi-speed power transmission device also includes: a second brake; the second brake end is connected to the first sun gear; when the first clutch is engaged and the second brake is braked, the first sun gear is braked, and the power is transmitted to the second sun gear through the first clutch, driving the second sun gear to rotate, the second sun gear drives the second planetary gear, and the second planetary gear drives the first planetary gear to rotate forward around the first sun gear, thereby driving the outer gear ring to rotate forward, realizing the 2nd gear mode.

[0009] In one embodiment, the multi-speed power transmission device further includes: a second clutch; one end of the second clutch is connected to the planetary carrier, and the other end is connected to the motor; when the first clutch, the second clutch, and the third clutch are engaged, the first sun gear, the second sun gear, the first planetary gear, and the second planetary gear are interlocked, the planetary carrier rotates, and the outer gear ring is driven to rotate forward, thereby realizing the 3-speed mode. At this time, the power of the motor is transmitted to the inside of the planetary gear through the first clutch, the second clutch, and the third clutch. Since the above three clutches are all engaged, the inside of the planetary gear is interlocked to form a rigid whole, thereby transmitting the power with a unique speed ratio to the outer gear ring to rotate forward, and then the power is output to the wheels.

[0010] In one embodiment, when the second clutch is engaged and the second brake is applied, the first sun gear is braked, and power is transmitted to the planetary carrier through the second clutch, driving the planetary carrier to rotate, thereby driving the first planetary gear to rotate forward, and further driving the outer ring gear to rotate forward, thereby realizing the 4th gear mode.

[0011] The present application also provides a multi-speed power transmission method, which is applied to the above-mentioned multi-speed power transmission device, and the method includes: when a motor direct drive mode instruction is received, the K0 clutch is controlled to be disconnected, and the motor output power is controlled; when a reverse gear instruction is received, the first brake is controlled to brake, and the third clutch is engaged. The first brake brakes to make the planetary carrier immobile, and the power is transmitted to the first sun gear through the third clutch, driving the first sun gear to rotate, the first sun gear drives the first planetary gear to reverse, and the first planetary gear drives the outer ring gear to reverse, so that the wheel reverses to achieve reverse gear.

[0012] In one embodiment, the multi-speed power transmission method further includes: when a parallel mode command is received, the K0 clutch is controlled to engage, and the motor and the engine are controlled to output power together; when an engine direct drive mode command is received, the K0 clutch is controlled to engage, the motor is controlled to shut down, and the power is output by the engine alone.

[0013] In one embodiment, the multi-speed power transmission method further includes: when a first-speed command is received, the first clutch is controlled to engage and the first brake is braked, the first brake is braked to make the planet carrier immobile, and the power is transmitted to the second sun gear through the first clutch to drive the second sun gear to rotate; the second sun gear drives the second planetary gear to rotate, the second planetary gear drives the first planetary gear to rotate forward, and the rotation of the first planetary gear drives the outer gear ring to rotate forward, so that the wheel rotates forward, and the first-speed mode is realized;

[0014] When a 2nd gear command is received, the first clutch is controlled to engage and the second brake is braked, the second brake mechanism brakes the first sun gear, and the power is transmitted to the second sun gear through the first clutch, driving the second sun gear to rotate, the second sun gear drives the second planetary gear, and the second planetary gear drives the first planetary gear to rotate forward around the first sun gear, thereby driving the outer gear ring to rotate forward, and realizing the 2nd gear mode;

[0015] When the 3rd gear command is received, the first clutch, the second clutch and the third clutch are controlled to engage, so that the first sun gear, the second sun gear, the first planetary gear and the second planetary gear are interlocked, the planet carrier rotates, and the outer ring gear is driven to rotate forward, thus realizing the 3rd gear mode;

[0016] When the 4th gear command is received, the second clutch is controlled to engage and the second brake is braked. The second brake brakes the first sun gear, and the power is transmitted to the planetary carrier through the second clutch, driving the planetary carrier to rotate, thereby driving the first planetary gear to rotate forward, and further driving the outer ring gear to rotate forward, realizing the 4th gear mode.

[0017] In one embodiment, the multi-speed power transmission method also includes: when a parking power generation command is received, controlling the K0 clutch to engage, the first clutch, the second clutch and the third clutch to engage, the second brake of the first brake to brake, and controlling the engine to deliver energy to the motor.

[0018] The technical solution provided by the above-mentioned embodiments of the present application is that the planetary gear includes a first sun gear, a first planetary gear meshed with the first sun gear, a second planetary gear meshed with the first planetary gear, a second sun gear meshed with the second planetary gear, an outer ring gear meshed with the first planetary gear, a planetary carrier connecting the first planetary gear and the second planetary gear, the outer ring gear is used to connect the wheels, and the first brake is connected to the planetary carrier; one end of the third clutch is connected to the first sun gear, and the other end is connected to the motor. When the first brake is braked and the third clutch is engaged, the planetary carrier does not move, and the power is transmitted to the first sun gear through the third clutch to drive the first sun gear to rotate, the first sun gear drives the first planetary gear to reverse, and the first planetary gear drives the outer ring gear to reverse, so that the wheel reverses to achieve reverse gear, so that when the vehicle is driven by a motor, reverse gear can be achieved without reversing the motor, thereby solving the safety problem that the vehicle does not have a mechanical reverse gear when it is electrically driven. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings required for use in the embodiments of the present application are briefly introduced below.

[0020] Figure 1 It is a driving schematic diagram of reverse gear in the motor direct drive mode of the multi-speed power transmission device provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the structure of a multi-speed power transmission device provided in one embodiment of the present application;

[0022] Figure 3 It is a driving schematic diagram of the first gear mode when the motor of the multi-gear power transmission device provided in the embodiment of the present application is in direct drive mode;

[0023] Figure 4 It is a driving schematic diagram of the 2nd gear mode when the motor of the multi-gear power transmission device provided in the embodiment of the present application is in direct drive mode;

[0024] Figure 5 It is a driving schematic diagram of the 3rd gear mode when the motor of the multi-gear power transmission device provided in the embodiment of the present application is in direct drive mode;

[0025] Figure 6 It is a driving schematic diagram of a 4-gear mode when the motor of a multi-gear power transmission device provided in an embodiment of the present application is in direct drive mode;

[0026] Figure 7 A schematic diagram of a multi-speed power transmission device for power generation during parking provided in an embodiment of the present application;

[0027] Figure 8 A schematic diagram of the gear positions of a multi-speed power transmission device provided in one embodiment of the present application;

[0028] Fig. 9A schematic diagram of a reverse gear in a parallel mode of a multi-speed power transmission device provided in an embodiment of the present application;

[0029] Fig.10 A schematic diagram of the first gear of a multi-speed power transmission device in parallel mode provided in an embodiment of the present application;

[0030] Fig.11 A schematic diagram of a multi-speed power transmission device in parallel mode 2 according to an embodiment of the present application;

[0031] Fig.12 A schematic diagram of a multi-speed power transmission device in parallel mode with 3 gears according to an embodiment of the present application;

[0032] Fig.13 A schematic diagram of a 4-gear parallel mode multi-gear power transmission device provided in an embodiment of the present application;

[0033] Fig.14 A schematic diagram of a multi-speed power transmission device provided in an embodiment of the present application, wherein the engine is directly driven and reversed;

[0034] Fig.15 A schematic diagram of a multi-speed power transmission device provided in an embodiment of the present application, wherein the engine is directly driven in 1st gear;

[0035] Fig.16 A schematic diagram of a multi-speed power transmission device provided in an embodiment of the present application, wherein the engine is directly driven in 2 gears;

[0036] Fig.17 A schematic diagram of a multi-speed power transmission device provided in an embodiment of the present application, wherein the engine is directly driven in 3 gears;

[0037] Fig.18 This is a schematic diagram of a multi-speed power transmission device with a 4-speed direct-drive engine according to an embodiment of the present application.

[0038] The above drawings include the following reference numerals:

[0039] Engine ENG; Motor EM1;

[0040] K0 clutch; first clutch C1; second clutch C2; third clutch C3;

[0041] The first brake B1; the second brake B2;

[0042] First sun gear S1a; second sun gear S1b; planet carrier H1; first planet gear P1a; second planet gear P1b; outer ring gear R1. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0044] Similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0045] Figure 1 Schematic diagram of reverse gear driving in the motor direct drive mode of the multi-speed power transmission device provided in the embodiment of the present application, such as Figure 1 As shown, the embodiment of the present application provides a multi-speed power transmission device. The multi-speed power transmission device includes: a housing, a motor EM1 located in the housing, a planetary gear, a first brake B1 and a third clutch C3. In one embodiment, the planetary gear can be a Ravigne planetary gear.

[0046] The planetary gear set includes a first sun gear S1a, a second sun gear S1b, a planet carrier H1, a first planetary gear P1a, a second planetary gear P1b and an outer ring gear R1. The first sun gear S1a meshes with the first planetary gear P1a; the first planetary gear P1a meshes with the second planetary gear P1b; the second planetary gear P1b meshes with the second sun gear S1b; the first planetary gear P1a meshes with the outer ring gear R1; the first planetary gear P1a and the second planetary gear P1b are connected to the planet carrier H1; and the outer ring gear R1 is used to connect the wheels.

[0047] The first brake B1 is connected to the planet carrier H1; one end of the third clutch C3 is connected to the first sun gear S1a, and the other end is connected to the motor EM1. One end of the first brake B1 is connected to the planet carrier H1, and the other end is connected to the housing. Figure 1 As shown, the motor EM1 can be connected in parallel with the engine ENG, and together they are connected to the third clutch C3.

[0048] When the first brake B1 is applied, the third clutch C3 is engaged ( Figure 1 When the first gear is in the gearbox (indicated by bold lines in the figure), since the planetary carrier H1 is connected to the first brake B1, the planetary carrier H1 is stationary (the speed is 0), and the power generated by the motor EM1 and / or the engine ENG can be transmitted to the first sun gear S1a through the third clutch C3, driving the first sun gear S1a to rotate, the first sun gear S1a drives the first planetary gear P1a to reverse, and the first planetary gear P1a drives the outer ring gear R1 to reverse, so that the wheels reverse to achieve reverse gear.

[0049] It should be noted that the default rotation direction of the motor EM1 remains unchanged when moving forward and backward, for example, it rotates clockwise, so that the first sun gear S1a can also be driven to rotate clockwise. The above reversal is relative to the rotation direction of the first sun gear S1a, and is opposite to the rotation direction of the first sun gear S1a. For example, if the first sun gear S1a rotates clockwise, the reversal of the first planetary gear P1a means that the first planetary gear P1a rotates counterclockwise, the reversal of the outer ring gear R1 means that the outer ring gear R1 also rotates counterclockwise, and the reversal of the wheels means that the wheels also rotate counterclockwise, and the vehicle moves backward. The present application has a mechanical body reverse gear, which solves the problem of reversing the car when the motor fails.

[0050] Figure 2 Schematic diagram of the structure of a multi-speed power transmission device provided in an embodiment of the present application. In one embodiment, Figure 2 As shown, the multi-speed power transmission device also includes an engine ENG, the engine ENG is connected to one end of the K0 clutch, and the other end of the K0 clutch is connected to the rotor of the motor EM1. Through the K0 clutch, the engine ENG can be coupled to realize the intervention of the engine ENG; in one embodiment, the K0 clutch is disconnected, and the power input to the planetary gear can come from the motor EM1, thereby realizing the motor direct drive mode; in another embodiment, the K0 clutch is engaged, and the power input to the planetary gear can come from the engine ENG, realizing the engine direct drive mode; in another embodiment, the K0 clutch is engaged, and the power input to the planetary gear can come from the motor EM1 and the engine ENG, realizing the parallel mode. Further, when the multi-speed power transmission device is in the pure electric mode or the parallel mode, if the driver steps on the brake pedal at this time, the vehicle detects the driver's braking intention, that is, the power recovery mode is turned on, and the driving mode is changed to the power generation mode, and the energy is converted from kinetic energy to electrical energy and flows to the power battery, forming an energy recovery mode. In the parking state, the K0 clutch is engaged, and the engine EMG can also charge the motor EM1.

[0051] Figure 3 1 is a driving schematic diagram of a multi-speed power transmission device provided in an embodiment of the present application in a motor direct drive mode in a first gear mode. In one embodiment, Figure 3 As shown, the multi-speed power transmission device further includes: a first clutch C1; one end of the first clutch C1 is connected to the second sun gear S1b; the other end is connected to the motor EM1; when the first clutch C1 is engaged and the first brake B1 is braked ( Figure 3(indicated by bold lines in the figure), since the planet carrier H1 is connected to the first brake B1, the planet carrier H1 is stationary (the speed is 0), and the power generated by the motor EM1 is transmitted to the second sun gear S1b through the first clutch C1, driving the second sun gear S1b to rotate; the second sun gear S1b drives the second planetary gear P1b to rotate, and the second planetary gear S1b drives the first planetary gear P1a to rotate forward, and the rotation of the first planetary gear P1a drives the outer ring gear R1 to rotate forward, so that the wheels rotate forward, realizing the 1st gear mode.

[0052] It should be noted that the rotation direction of the motor EM1 remains unchanged when the vehicle is moving forward or backward by default, for example, it rotates clockwise, so that the second sun gear S1b can also be driven to rotate clockwise. The above-mentioned positive rotation is relative to the rotation direction of the second sun gear S1b, and is the same as the rotation direction of the second sun gear S1b. For example, if the second sun gear S1b rotates clockwise, the positive rotation of the first planetary gear P1a means that the first planetary gear P1a rotates clockwise, the positive rotation of the outer ring gear R1 means that the outer ring gear R1 also rotates clockwise, and the positive rotation of the wheels means that the wheels also rotate clockwise, and the vehicle moves forward.

[0053] Figure 4 2 is a schematic diagram of driving the multi-speed power transmission device in the motor direct drive mode in the second gear mode provided in the embodiment of the present application. In one embodiment, Figure 4 As shown, the multi-speed power transmission device also includes: a second brake B2; one end of the second brake B2 is connected to the first sun gear S1a, and the other end is connected to the housing; when the first clutch C1 is engaged and the second brake B2 is braked; the first sun gear S1a is braked (the speed is 0), and the power of the motor EM1 is transmitted to the second sun gear S1b through the first clutch C1, driving the second sun gear S1b to rotate, the second sun gear S1b drives the second planetary gear P1b to reverse, and the second planetary gear P1b drives the first planetary gear P1a to rotate forward around the first sun gear S1a, thereby driving the outer gear ring R1 to rotate forward, and then the power is output to the wheels, forming the second gear;

[0054] It should be noted that the above-mentioned positive rotation refers to the rotation direction of the second sun gear S1b, which is the same as the rotation direction of the second sun gear S1b.

[0055] Figure 5 Schematic diagram of driving the 3rd gear mode in the direct drive mode of the motor of the multi-gear power transmission device provided in the embodiment of the present application. In one embodiment, Figure 5As shown, the multi-speed power transmission device also includes: a second clutch C2; one end of the second clutch C2 is connected to the planetary carrier H1, and the other end is connected to the motor EM1; when the first clutch C1 is engaged, the second clutch C2 is engaged, and the third clutch C3 is engaged, the power of the motor is transmitted to the inside of the planetary row through the first clutch C1, the second clutch C2, and the third clutch C3, the first sun gear S1a rotates forward, the second sun gear S1b rotates forward, and the second sun gear S1b drives the second planetary gear P1b to reverse, so that the first planetary gear P1a is interlocked with the first sun gear S1a and the second planetary gear P1b, so the inside of the planetary row is interlocked to form a rigid whole, the planetary carrier H1 rotates forward, so that the power of the speed ratio is only 1. The outer ring gear R1 rotates forward, and then the power is output to the wheels to form the third gear;

[0056] It should be noted that the above-mentioned forward rotation is relative to the rotation direction of the first sun gear S1a. The first sun gear S1a, the second sun gear S1b and the planetary carrier H1 have the same rotation direction. By default, the rotation direction of the motor EM1 remains unchanged during forward and reverse movement, for example, clockwise rotation, thereby driving the first sun gear S1a, the second sun gear S1b and the planetary carrier H1 to rotate clockwise as well.

[0057] Figure 6 Schematic diagram of the driving of the 4-gear mode in the direct drive mode of the motor of the multi-gear power transmission device provided in the embodiment of the present application. In one embodiment, Figure 6 As shown, when the second clutch C2 is engaged and the second brake B2 is braking, the first sun gear S1a is braked (speed is 0), and the power of the motor EM1 is transmitted to the planetary carrier H1 through the second clutch C2 for forward rotation, the planetary carrier H1 drives the first planetary gear P1a to rotate forward, and the first planetary gear P1a drives the outer ring gear R1 to rotate forward, thereby outputting force to the wheels to form 4th gear.

[0058] Figure 7 Schematic diagram of a multi-speed power transmission device for power generation. In one embodiment, Figure 7 As shown, when the vehicle is in the parking state, the K0 clutch is engaged, all other clutches are not engaged, all brakes are braked, and the engine ENG power directly drives the motor EM1 rotor to generate electricity, thereby realizing the parking power generation mode.

[0059] Figure 8 is a schematic diagram of the gear positions of a multi-gear power transmission device provided in an embodiment of the present application. In one embodiment, Figure 8 Shown are the specific combinations of different clutches and brakes in each gear position in the pure electric mode and parallel mode in the above device.

[0060] The embodiment of the present application also provides a multi-speed power transmission method, which can be applied to the above-mentioned multi-speed power transmission device. When a motor direct drive mode command is received, the K0 clutch is controlled to be disconnected, and the motor EM1 is controlled to output power; when a parallel mode command is received, the K0 clutch is controlled to be engaged, and the motor EM1 and the engine ENG are controlled to output power together; when an engine direct drive mode command is received, the K0 clutch is controlled to be engaged, and the motor EM1 is controlled to be closed, and the engine ENG alone outputs power.

[0061] Fig. 9 This is a schematic diagram of the reverse gear in parallel mode of the multi-speed power transmission device provided in the embodiment of the present application. Fig. 9 , further introducing the multi-gear power transmission method provided by an embodiment of the present application, the method also includes: when a reverse gear command is received, the first brake B1 is controlled to brake, and the third clutch C3 is engaged. Since the planet carrier H1 is connected to the first brake B1, the planet carrier H1 is stationary (the speed is 0), and the power is transmitted to the first sun gear S1a through the third clutch C3, driving the first sun gear S1a to rotate, the first sun gear S1a drives the first planetary gear P1a to reverse, and the first planetary gear P1a drives the outer ring gear R1 to reverse, so that the wheel reverses to achieve reverse gear.

[0062] Fig.10 1 is a schematic diagram of a multi-speed power transmission device in parallel mode. In one embodiment, Fig.10 As shown, the method also includes: when receiving the 1st gear instruction, controlling the first clutch C1 to engage and the first brake B1 to brake, since the planetary carrier H1 is connected to the first brake B1, the planetary carrier H1 is stationary (the speed is 0), and the power is transmitted to the second sun gear S1b through the first clutch C1, driving the second sun gear S1b to rotate; the second sun gear S1b drives the second planetary gear P1b to rotate, the second planetary gear S1b drives the first planetary gear P1a to rotate forward, and the rotation of the first planetary gear P1a drives the outer ring gear R1 to rotate forward, so that the wheels rotate forward, realizing the 1st gear mode.

[0063] Fig.11 2 is a schematic diagram of a multi-speed power transmission device in parallel mode. In one embodiment, Fig.11 As shown, the method further includes: when receiving the 2nd gear instruction, controlling the first clutch C1 to engage and the second brake B2 to brake, the second brake machine brake B2 to brake the first sun gear S1a (the speed is 0), the power is transmitted to the second sun gear S1b through the first clutch C1, driving the second sun gear S1b to rotate, the second sun gear S1b drives the second planetary gear P1b to reverse, the second planetary gear P1b drives the first planetary gear P1a to rotate forward around the first sun gear S1a, thereby driving the outer ring gear R1 to rotate forward, and then the power is output to the wheels to form the 2nd gear;

[0064] Fig.12 3 is a schematic diagram of a multi-speed power transmission device in parallel mode. In one embodiment, Fig.12 As shown, the method further includes: when receiving the 3rd gear instruction, controlling the first clutch C1, the second clutch C2, and the third clutch C3 to engage, when the first clutch C1, the second clutch C2, and the third clutch C3 are engaged, the power is transmitted to the inside of the planetary gear through the first clutch C1, the second clutch C2, and the third clutch C3, the first sun gear S1a rotates forward, the second sun gear S1b rotates forward, the second sun gear S1b drives the second planetary gear P1b to reverse, so that the first planetary gear P1a is interlocked with the first sun gear S1a and the second planetary gear P1b, so that the inside of the planetary gear is interlocked to form a rigid whole, the planet carrier H1 rotates forward, so that the power of the speed ratio is transmitted to the outer ring gear R1 to rotate forward, and then the power is output to the wheels, forming the 3rd gear;

[0065] Fig.13 4 is a schematic diagram of a multi-speed power transmission device in parallel mode. In one embodiment, Fig.13 As shown, the method further includes: when receiving the 4th gear instruction, controlling the second clutch C2 to engage and the second brake B2 to brake, the second brake B2 brakes the first sun gear S1a (the speed is 0), the power is transmitted to the planet carrier H1 through the second clutch C2 to rotate forward, the planet carrier H1 drives the first planetary gear P1a to rotate forward, the first planetary gear P1a drives the outer ring gear R1 to rotate forward, so that the force is output to the wheel, forming the 4th gear;

[0066] Fig.14 , Fig.15 , Fig.16 , Fig.17 , Fig.18 They are respectively a reverse gear schematic diagram, a 1st gear schematic diagram, a 2nd gear schematic diagram, a 3rd gear schematic diagram, and a 4th gear schematic diagram of the multi-speed power transmission device provided in an embodiment of the present application in the engine direct drive mode; the implementation process of power transmission in each gear in the engine direct drive mode is specifically described in detail in the corresponding power transmission method in the motor direct drive mode and parallel mode of the above-mentioned multi-speed power transmission device, which will not be repeated here.

[0067] In the embodiments provided in this application, the disclosed devices and methods may also be implemented in other ways. The device embodiments described above are merely illustrative, for example, the gear device structure diagram and gear schematic diagram in the accompanying drawings show the functions and operations that may be implemented by the devices and methods according to the embodiments of this application.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-speed power transmission device, characterized in that: include: Motor; Planetary gear; The planetary gear comprises: a first sun gear, a first planetary gear meshed with the first sun gear; a second planetary gear meshed with the first planetary gear; a second sun gear meshed with the second planetary gear; an outer ring gear meshed with the first planetary gear; a planet carrier connecting the first planetary gear and the second planetary gear; the outer ring gear is used to connect the wheels; A first brake; the first brake is connected to the planet carrier; A third clutch; one end of the third clutch is connected to the first sun gear; the other end is connected to the motor; When the first brake is applied and the third clutch is engaged, the planetary carrier remains stationary, and power is transmitted to the first sun gear through the third clutch to drive the first sun gear to rotate, and the first sun gear drives the first planetary gear to reverse, and the first planetary gear drives the outer gear ring to reverse, so that the wheels reverse to achieve reverse gear.

2. A multi-speed power transmission device according to claim 1, characterized in that: The device also includes: The engine is connected to the rotor of the motor via a K0 clutch; The power comes from the motor and / or the engine.

3. A multi-speed power transmission device according to claim 2, characterized in that: Also includes: A first clutch; one end of the first clutch is connected to the second sun gear; the other end is connected to the motor; When the first clutch is engaged and the first brake is applied, the planetary carrier remains stationary, and power is transmitted to the second sun gear through the first clutch, driving the second sun gear to rotate; the second sun gear drives the second planetary gear to rotate, and the second planetary gear drives the first planetary gear to rotate forward, and the rotation of the first planetary gear drives the outer ring gear to rotate forward, so that the wheels rotate forward, realizing the 1st gear mode.

4. A multi-speed power transmission device according to claim 3, characterized in that: Also includes: Second brake; The second brake is connected to the first sun gear; When the first clutch is engaged and the second brake is applied, the first sun gear is braked, and power is transmitted to the second sun gear through the first clutch, driving the second sun gear to rotate, and the second sun gear drives the second planetary gear, and the second planetary gear drives the first planetary gear to rotate forward around the first sun gear, thereby driving the outer ring gear to rotate forward, realizing the 2nd gear mode.

5. A multi-speed power transmission device according to claim 4, characterized in that: Also includes: Second clutch; One end of the second clutch is connected to the planet carrier, and the other end is connected to the motor; When the first clutch, the second clutch, and the third clutch are engaged, the first sun gear, the second sun gear, the first planetary gear, and the second planetary gear are interlocked, and the planetary carrier rotates to drive the outer ring gear to rotate forward, thereby realizing the 3rd gear mode.

6. A multi-speed power transmission device according to claim 5, characterized in that: Also includes: When the second clutch is engaged and the second brake is applied, the first sun gear is braked, and power is transmitted to the planetary carrier through the second clutch, driving the planetary carrier to rotate, thereby driving the first planetary gear to rotate forward, and further driving the outer ring gear to rotate forward, thereby realizing the 4th gear mode.

7. A multi-speed power transmission method, characterized in that: Applied to the multi-speed power transmission device according to claim 6, the method comprises: When receiving a motor direct drive mode instruction, controlling the K0 clutch to be disconnected, and controlling the motor to output power; When a reverse gear command is received, the first brake is controlled to brake and the third clutch is engaged. The first brake brakes the planetary carrier to stop moving. The power is transmitted to the first sun gear through the third clutch, driving the first sun gear to rotate. The first sun gear drives the first planetary gear to reverse. The first planetary gear drives the outer ring gear to reverse, so that the wheel reverses to achieve reverse gear.

8. The multi-speed power transmission method according to claim 7, characterized in that: Also includes: When a parallel mode command is received, the K0 clutch is controlled to engage, and the motor and the engine are controlled to jointly output power; When the engine direct drive mode command is received, the K0 clutch is controlled to engage, the motor is controlled to shut down, and the engine alone outputs power.

9. The multi-speed power transmission method according to claim 7, characterized in that: Also includes: When a 1st gear command is received, the first clutch is controlled to engage and the first brake is controlled to brake. The first brake brakes the planet carrier to stop, and the power is transmitted to the second sun gear through the first clutch to drive the second sun gear to rotate; the second sun gear drives the second planetary gear to rotate, the second planetary gear drives the first planetary gear to rotate forward, and the rotation of the first planetary gear drives the outer gear ring to rotate forward, so that the wheel rotates forward, and the 1st gear mode is realized; When a 2nd gear command is received, the first clutch is controlled to engage and the second brake is controlled to brake, the second brake mechanism brakes the first sun gear, the power is transmitted to the second sun gear through the first clutch, drives the second sun gear to rotate, the second sun gear drives the second planetary gear, the second planetary gear drives the first planetary gear to rotate forward around the first sun gear, thereby driving the outer gear ring to rotate forward, and realizing the 2nd gear mode; When a third gear command is received, the first clutch, the second clutch, and the third clutch are controlled to engage, so that the first sun gear, the second sun gear, the first planetary gear, and the second planetary gear are interlocked, the planet carrier rotates, and the outer gear ring is driven to rotate forward, thereby realizing the third gear mode; When the 4th gear command is received, the second clutch is controlled to engage and the second brake is controlled to brake. The second brake brakes the first sun gear, and power is transmitted to the planetary carrier through the second clutch, driving the planetary carrier to rotate, thereby driving the first planetary gear to rotate forward, and further driving the outer ring gear to rotate forward, thereby realizing the 4th gear mode.

10. The multi-speed power transmission method according to claim 7, characterized in that: Also includes: When a parking power generation instruction is received, the K0 clutch is controlled to engage, the first clutch, the second clutch and the third clutch are controlled to engage, the second brake of the first brake is braked, and the engine is controlled to deliver energy to the motor.

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