Hybrid power system

Abstract

A hybrid system is provided that includes a first electric machine (10), a second electric machine (20), an engine (30), a planetary gear mechanism (40), and a plurality of transfer gears (50). The transmission gear (50) is in transmission connection with the gear ring (44) and used for transmitting the torque of the second motor and / or the engine to the wheels so as to drive the vehicle to run. A rotor (11) of the first motor is in transmission connection to the sun gear (41), the engine is in controlled transmission connection to the planet carrier (43), so that the engine can drive the first motor to generate electricity through the planetary gear mechanism, torque of the engine can be output to the wheels through the planetary gear mechanism and the transmission gears, and a rotor (21) of the second motor is in transmission connection to the gear ring. The torque of the second motor can be output to the wheels through the plurality of transmission gears.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle drive systems, and in particular to a hybrid system. BACKGROUND

[0002] A DHT (hybrid system) based on a single-gear dual-motor known to the inventor adopts a P1+P3 topology structure, which is equipped with two motors (one generator and one drive motor). The hybrid system has two working modes of series and parallel, supports pure electric drive (EV), hybrid drive (HEV) and engine direct drive function. The hybrid system adopts a single-gear design for the engine and the drive motor, and a wet clutch is configured at the front end of the gearbox.

[0003] The existing hybrid system adopts a coaxial arrangement or parallel arrangement scheme of the motors, resulting in a large axial size or overall length. In addition, the generator and the engine are connected through a pair of gears, which design requires the use of two gears, a long shaft and two bearings, resulting in a high system cost. CONTENT OF THE UTILITY MODEL

[0004] The present application is made in view of the above state of the art. The purpose of the present application is to provide a hybrid system with a simple structure.

[0005] Embodiments of the present application provide a hybrid system, comprising:

[0006] a first motor and a second motor coaxially arranged, the first motor being located radially inside the second motor;

[0007] an engine;

[0008] a planetary gear mechanism comprising a sun gear, a plurality of planet gears, a planet carrier and a ring gear; and

[0009] a plurality of transmission gears transmissionally connected to the ring gear for transmitting torque of the second motor and / or the engine to a wheel to drive the vehicle to travel,

[0010] wherein a rotor of the first motor is transmissionally connected to the sun gear, the engine is controlled transmissionally connected to the planet carrier, so that the engine can drive the first motor to generate electricity via the planetary gear mechanism, and torque of the engine can be output to the wheel via the planetary gear mechanism and the plurality of transmission gears, and a rotor of the second motor is transmissionally connected to the ring gear, so that torque of the second motor can be output to the wheel via the plurality of transmission gears.

[0011] In at least one embodiment, the hybrid system further comprises a clutch disposed between the engine and the carrier, so as to enable establishing or cutting off the transmission connection between the engine and the carrier.

[0012] In at least one embodiment, the hybrid system further comprises a brake mounted between the housing of the hybrid system and the rotor of the first motor, for allowing or inhibiting the rotation of the rotor.

[0013] In at least one embodiment, the hybrid system further comprises a differential, the plurality of transmission gears comprising a first gear meshing with the outer peripheral teeth of the ring gear, a second gear transmissionally connected with the first gear via an intermediate shaft parallel to the central axis of the planetary gear mechanism, and a third gear meshing with the second gear, the third gear constituting an input gear of the differential.

[0014] In at least one embodiment, the planetary gear mechanism is a double-stage planetary gear mechanism, the plurality of planetary gears comprising:

[0015] a plurality of first-stage planetary gears meshing with the sun gear; and

[0016] a plurality of second-stage planetary gears meshing with the ring gear,

[0017] the first-stage planetary gears and the second-stage planetary gears are both mounted to the carrier, so as to be able to revolve around the sun gear together with the carrier and rotate relative to the carrier.

[0018] In at least one embodiment, the planetary gear mechanism is a single-stage planetary gear mechanism, the planetary gear mechanism being located between the first motor and the engine in the axial direction of the first motor.

[0019] In at least one embodiment, the stator of the first motor and the stator of the second motor share the same stator core.

[0020] In at least one embodiment, the hybrid system has a pure electric driving mode driven by the second motor, wherein the second motor transmits torque to the wheels via the ring gear and the plurality of transmission gears; and / or

[0021] the hybrid system has an engine driving mode, wherein the clutch is engaged, the brake is closed, and the engine transmits torque to the wheels via the clutch, the planetary gear mechanism and the plurality of transmission gears.

[0022] In at least one embodiment, the hybrid system has an enhanced mode, wherein the clutch is engaged, the brake is closed, the engine transmits torque to the wheels via the clutch, the planetary gear mechanism and the plurality of drive gears, and the second motor transmits torque to the wheels via the ring gear and the plurality of drive gears; and / or

[0023] The hybrid system has a hybrid drive mode, wherein the clutch is engaged, the brake is open, the second motor transmits torque to the wheels via the ring gear and the plurality of drive gears, and the engine operates to drive the first motor to generate electricity via the clutch and the planetary gear mechanism, and to transmit torque to the wheels via the clutch, the planetary gear mechanism and the plurality of drive gears.

[0024] In at least one embodiment, the hybrid system has an engine restart mode, wherein the clutch is engaged, and the first motor drives the engine to start via the sun gear, the carrier and the clutch; and / or

[0025] The hybrid system has an energy recovery mode, wherein torque of the wheels is transmitted to the second motor via the plurality of drive gears and the ring gear, and the second motor generates electricity to brake energy recovery.

[0026] In the above-mentioned embodiments, torque of the engine can be output to the wheels via the planetary gear mechanism and the plurality of drive gears, the engine can drive the first motor to generate electricity via the planetary gear mechanism, and no other speed reduction mechanism is needed between the engine and the first motor, the planetary gear mechanism is fully utilized, and the structure is simple. The number of components is reduced, and the size, weight and cost of the hybrid system can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A structural schematic diagram of a hybrid system according to one embodiment of the present application is shown.

[0028] Figure 2 A structural schematic diagram of a hybrid system according to another embodiment of the present application is shown. DETAILED DESCRIPTION

[0029] Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are merely for the purpose of teaching one skilled in the art how to practice the present application, and are not intended to limit the scope of the present application as defined in the appended claims.

[0030] In the present application, "transmission connection" refers to a connection between two components that can transmit torque, including direct connection or indirect connection between the two components.

[0031] As Figure 1 and Figure 2 described, embodiments of the present application provide a hybrid system, which can include a first electric machine 10, a second electric machine 20, an engine 30, a planetary gear mechanism 40, and a plurality of drive gears 50.

[0032] The first electric machine 10 and the second electric machine 20 can be coaxially arranged, with the first electric machine 10 located radially inside the second electric machine 20. The planetary gear mechanism 40 can include a sun gear 41, a plurality of planet gears 42, a planet carrier 43, and a ring gear 44. The plurality of drive gears 50 can be drivingly connected to the ring gear 44, mainly for transmitting torque of the second electric machine 20 and / or the engine 30 to wheels to drive the vehicle to travel.

[0033] Here, the rotor 11 of the first electric machine 10 can be drivingly connected to the sun gear 41, for example, via an output shaft 111 of the rotor 11 to the sun gear 41. The engine 30 can be controllably drivingly connected to the planet carrier 43. In this way, the engine 30 can drive the first electric machine 10 to generate electricity via the planetary gear mechanism 40, and torque of the engine 30 can be output to the wheels via the planetary gear mechanism 40 and the plurality of drive gears 50. The rotor 21 of the second electric machine 20 can be drivingly connected to the ring gear 44, so that torque of the second electric machine 20 can be output to the wheels via the plurality of drive gears 50.

[0034] In the above-mentioned embodiments, torque of the engine can be output to the wheels via the planetary gear mechanism and the plurality of drive gears, the engine can drive the first electric machine to generate electricity via the planetary gear mechanism, without having to provide other speed reduction mechanisms between the engine and the first electric machine, the planetary gear mechanism is fully utilized, and the structure is simple. The number of components is reduced, and the size, weight, and cost of the hybrid system can be reduced.

[0035] Optionally, the hybrid system can further include a clutch 60, which is provided between the engine 30 (e.g., an output shaft 31 of the engine 30) and the planet carrier 43, so as to be able to establish a driving connection or cut off the driving connection between the engine 30 and the planet carrier 43, i.e., so that the engine 30 is controllably drivingly connected to the planet carrier 43. When the clutch 60 is engaged, the driving connection between the engine 30 and the planet carrier 43 is established. When the clutch 60 is disengaged, the driving connection between the engine 30 and the planet carrier 43 is cut off, at which time the planet carrier 43 can rotate relative to the output shaft 31 of the engine 30.

[0036] Here, the output shaft 111 of the rotor 11 can be a hollow shaft, and the output shaft 31 of the engine 30 can be inserted into the output shaft 111 of the rotor 11.

[0037] Optionally, the hybrid system can further include a brake 90 installed between the housing of the hybrid system and the rotor 11 of the first motor 10 for allowing or inhibiting rotation of the rotor 11. When the brake 90 is closed, the rotor 11 cannot rotate, and when the brake 90 is opened, the rotor can rotate. As an example, the brake 90 can be installed between the housing of the hybrid system and the output shaft 111 (or rotor support) of the rotor 11 of the first motor 10. The output shaft 111 (or rotor support) of the rotor 11 can also be connected to the sun gear 41.

[0038] Optionally, the hybrid system can further include a differential 80. The plurality of transmission gears 50 can be composed of a first gear 51 engaged with the outer peripheral teeth 442 of the ring gear 44, a second gear 52 transmissionally connected with the first gear 51 via an intermediate shaft 70 parallel to the central axis of the planetary gear mechanism 40, and a third gear 53 engaged with the second gear 52. The third gear 53 can constitute an input gear of the differential 80.

[0039] Optionally, referring to Figure 1 , the planetary gear mechanism 40 can be a double-stage planetary gear mechanism, i.e., the planetary gears 42 can include two groups of planetary gears. Specifically, the plurality of planetary gears 42 can include a plurality of first-stage planetary gears 421 engaged with the sun gear 41, and a plurality of second-stage planetary gears 422 engaged with the inner peripheral teeth 441 of the ring gear 44. The first-stage planetary gears 421 and the second-stage planetary gears 422 are both installed to the carrier 43, so as to be able to revolve around the sun gear 41 and rotate relative to the carrier 43. Using the double-stage planetary gear mechanism can achieve greater transmission ratio and torque output.

[0040] Optionally, referring to Figure 2 , the planetary gear mechanism 40 can be a single-stage planetary gear mechanism, i.e., the planetary gears 42 have only one group of planetary gears. Using the single-stage planetary gear mechanism can achieve a more compact structure, facilitating miniaturization and light weight.

[0041] It can be understood that, compared with the embodiment of Figure 1 , the planetary gear mechanism 40 of the hybrid system shown in Figure 2 is a single-stage planetary gear mechanism. In addition, the arrangement positions of the motor and the gear mechanism are also changed. These are exemplary, rather than limiting.

[0042] In the embodiment shown in Figure 2 , the motor is arranged in the axial direction of the planetary gear mechanism 40. In other embodiments, the motor can be arranged in the radial direction of the planetary gear mechanism 40. Figure 2The planetary gear mechanism 40 is located between the motor and the engine 30 in the left-right direction, and the output shaft 31 of the engine 30 and the output shaft 111 of the rotor 11 can be two shafts coaxially arranged but separated. The output shaft 31 does not necessarily pass through the output shaft 111, so that the lengths of the two output shafts can be small, and the support is simple and stable.

[0043] Optionally, the stator of the first motor 10 and the stator of the second motor 20 share the same stator core 100, that is, the two motors form a conjugate stator motor.

[0044] Of course, the present application is not limited to this. Optionally, the first motor 10 and the second motor 20 can have independent stators from each other, and the two motors can be nested together, having the same axial size and occupying the same axial space.

[0045] The hybrid system of the present application with the above structure can work in multiple modes, and some typical examples are given in Table 1 below.

[0046] Table 1 Several typical working modes of the hybrid system

[0047] Operating mode Brake 90 Clutch 60 Engine 30 First electric machine 10 Second electric machine 20 Pure electric drive mode X X X X O Engine restart mode X O X O X Boost mode O O O X O Engine drive mode O O O X X Energy recovery mode X X X X O Hybrid drive mode X O O O O

[0048] It can be understood that in Table 1, X means not working, that is, the brake is open, or the clutch is separated, or the engine is not working, and the motor does not output driving force and does not generate electricity. In Table 1, O means working, that is, the brake is closed, or the clutch is engaged, or the engine is working (outputting driving force), and the motor is driving or generating electricity.

[0049] It can be understood that in some modes, the rotor 21 of the second motor 20 can rotate with the gear ring 44 without outputting driving force and generating electricity.

[0050] Some working modes of the hybrid system of the embodiment of the present application will be further described below with reference to Table 1.

[0051] Pure electric drive mode

[0052] The hybrid system can have a pure electric driving mode driven by the second motor 20, in which the second motor 20 transmits torque to the wheels via the gear ring 44 and the plurality of transmission gears 50, thereby driving the vehicle to travel. At this time, the brake 90 can be open, the clutch 60 can be separated, the engine 30 is not working, and the first motor 10 is not working.

[0053] Engine restart mode

[0054] The hybrid system can have an engine restart mode in which the clutch 60 is engaged, the first motor 10 drives the engine start via the sun gear 41, the carrier 43, and the clutch 60. At this time, the brake 90 is open, the second motor 20 is not working, but the rotor 21 of the second motor 20 can rotate with the rotation of the second ring gear 44.

[0055] Boost mode

[0056] The hybrid system can have an enhanced mode in which the clutch 60 is engaged, the brake 90 is closed, the engine 30 transmits torque to the wheels via the clutch 60, the planetary gear mechanism 40, and the plurality of transmission gears 50, and the second motor 20 transmits torque to the wheels via the ring gear 44 and the plurality of transmission gears 50. At this time, the first motor 10 is not working.

[0057] Engine drive mode

[0058] The hybrid system can have an engine drive mode in which the clutch 60 is engaged, the brake 90 is closed, and the engine 30 transmits torque to the wheels via the clutch 60, the planetary gear mechanism 40, and the plurality of transmission gears 50. At this time, the first motor 10 and the second motor 20 can not work.

[0059] Energy recovery mode

[0060] The hybrid system can have an energy recovery mode in which torque of the wheels is transmitted to the second motor 20 by the plurality of transmission gears 50 and the ring gear 44, and the second motor 20 generates electricity to brake and recover energy. At this time, it can be that the brake 90 is open, the clutch 60 is separated, the engine 30 is not working, and the first motor 10 is not working; or it can be that the brake 90 is open, the clutch 60 is engaged, and the engine 30 drives the first motor 10 to generate electricity.

[0061] Hybrid drive mode

[0062] The hybrid system can have a hybrid drive mode in which the clutch 60 is engaged, the brake 90 is open, and the second motor 20 transmits torque to the wheels via the ring gear 44 and the plurality of transmission gears 50; the engine 30 works, can drive the first motor 10 to generate electricity via the clutch 60 and the planetary gear mechanism 40, and can transmit torque to the wheels via the clutch 60, the planetary gear mechanism 40, and the plurality of transmission gears 50.

[0063] The following describes some of the advantages of the above-described embodiments of the present application.

[0064] (1) The torque from the second motor 20 is reduced via the ring gear 44 and the plurality of transmission gears 50, and the torque from the engine 30 is reduced via the planetary gear mechanism 40 and the plurality of transmission gears 50, so the transmission efficiency is high. Since there are two power flows (transmission paths), the planetary gear mechanism 40 and the plurality of transmission gears 50, the number of revolutions of the engine 30 and the second motor 20 is easily matched.

[0065] (2) The adoption of a scheme of a cogging stator design or two motors nested with each other makes the structure compact, the axial dimension small, and facilitates flexible installation to a vehicle.

[0066] (3) There are multiple operation modes such as a hybrid drive mode and an enhancement mode, and the hybrid system and the vehicle including the hybrid system can operate with high efficiency.

[0067] The embodiments of the present application also provide a vehicle including the hybrid system described above.

[0068] It should be understood that at least part of the aspects or features of the above-described embodiments, examples or modifications can be appropriately combined.

[0069] It can be understood that in the present application, when the number of components or members is not particularly limited, the number thereof can be one or more, and here, the plurality means two or more. For the case where the number of components or members is described as, for example, two, three, four, etc. in the drawings and / or the description, the specific number is generally exemplary and not restrictive, and it can be understood as a plurality, i.e., two or more, but this does not mean that the present application excludes the case of one.

[0070] It should be understood that the above-described embodiments, examples or modifications are only exemplary and are not used to limit the present application. Those skilled in the art can make various modifications and changes to the above-described embodiments, examples or modifications under the teachings of the present application without departing from the scope of the present application.

Claims

1. A hybrid system, characterized in that, include: A first motor and a second motor are arranged coaxially, with the first motor located radially inside the second motor. engine; A planetary gear mechanism, which includes a sun gear, multiple planetary gears, a planet carrier, and a ring gear; as well as Multiple transmission gears, which are drively connected to the gear ring, are used to transmit the torque of the second motor and / or the engine to the wheels to drive the vehicle. The rotor of the first motor is driven to the sun gear, and the engine is controlled to be driven to the planetary carrier, so that the engine can drive the first motor to generate electricity via the planetary gear mechanism, and the torque of the engine can be output to the wheel via the planetary gear mechanism and the plurality of transmission gears. The rotor of the second motor is driven to the ring gear, so that the torque of the second motor can be output to the wheel via the plurality of transmission gears.

2. The hybrid system according to claim 1, characterized in that, It also includes a clutch disposed between the engine and the planetary carrier, thereby enabling the establishment or disengagement of a drive connection between the engine and the planetary carrier.

3. The hybrid system according to claim 2, characterized in that, It also includes a brake, which is mounted between the housing of the hybrid system and the rotor of the first motor, for allowing or inhibiting the rotation of the rotor.

4. The hybrid system according to claim 1, characterized in that, It also includes a differential, wherein the plurality of transmission gears are composed of a first gear, a second gear and a third gear, the first gear meshes with the outer peripheral teeth of the gear ring, the second gear and the first gear are connected via an intermediate shaft, the intermediate shaft is parallel to the central axis of the planetary gear mechanism, the third gear meshes with the second gear, and the third gear constitutes the input gear of the differential.

5. The hybrid system according to claim 1, characterized in that, The planetary gear mechanism is a two-stage planetary gear mechanism, and the plurality of planetary gears include: Multiple first-stage planetary gears meshing with the sun gear; and Multiple second-stage planetary gears mesh with the gear ring. Both the first-stage planetary gear and the second-stage planetary gear are mounted on the planet carrier, so that they can revolve around the sun gear together with the planet carrier and rotate relative to the planet carrier.

6. The hybrid system according to claim 1, characterized in that, The planetary gear mechanism is a single-stage planetary gear mechanism, located axially between the first motor and the engine.

7. The hybrid system according to claim 1, characterized in that, The stator of the first motor and the stator of the second motor share the same stator core.

8. The hybrid system according to claim 3, characterized in that, The hybrid system has a pure electric drive mode driven by the second motor, wherein the second motor transmits torque to the wheels via the gear ring and the plurality of transmission gears; and / or The hybrid system has an engine-driven mode in which the clutch is engaged, the brake is closed, and the engine transmits torque to the wheels via the clutch, the planetary gear mechanism, and the plurality of transmission gears.

9. The hybrid system according to claim 3, characterized in that, The hybrid system has an enhanced mode in which the clutch is engaged, the brake is closed, the engine transmits torque to the wheels via the clutch, the planetary gear mechanism, and the plurality of drive gears, and the second motor transmits torque to the wheels via the ring gear and the plurality of drive gears; and / or The hybrid system has a hybrid drive mode in which the clutch is engaged, the brake is disengaged, and the second motor transmits torque to the wheels via the ring gear and the plurality of transmission gears; the engine operates, drives the first motor to generate electricity via the clutch and the planetary gear mechanism, and transmits torque to the wheels via the clutch, the planetary gear mechanism and the plurality of transmission gears.

10. The hybrid system according to claim 2 or 3, characterized in that, The hybrid system has an engine restart mode, wherein the clutch is engaged, and the first motor drives the engine to start via the sun gear, the planetary carrier, and the clutch; and / or The hybrid system has an energy recovery mode, in which the torque of the wheel is transmitted to the second motor by the multiple transmission gears and the gear ring, and the second motor generates electricity to recover braking energy.

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