Hybrid power system

Abstract

The utility model provides a hybrid power system which comprises a planet wheel assembly and a power transmission assembly, the planet wheel assembly comprises a sun wheel, a planet carrier, a plurality of planet wheels and a gear ring, the planet wheels can be rotationally connected to the planet carrier relative to the planet carrier, and the planet wheels are meshed with the sun wheel and the gear ring; an output shaft of the internal combustion engine is connected to the planet carrier in an anti-torque manner; a differential; the intermediate shaft and the output shaft are arranged in parallel; the first transmission stage comprises a first gear and a second gear, the first gear is connected to the planet carrier in an anti-torque mode, the first gear and the planet carrier are coaxially arranged, the second gear is arranged on the intermediate shaft, and the first gear is meshed with the second gear; and the second transmission stage comprises a third gear and a fourth gear, the third gear is connected to the intermediate shaft in an anti-torque mode, the fourth gear is connected to the differential mechanism, and the third gear and the fourth gear are meshed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of hybrid vehicles, and in particular relates to a hybrid power system. BACKGROUND

[0002] CN114761265A proposes a drive unit and a drive assembly, the internal combustion engine and the first electric rotary machine are not coaxial, and the internal combustion engine and the second electric rotary machine are also not coaxial. And when the internal combustion engine outputs power to the differential transmission, it needs to pass through three levels of the first transmission level, the second transmission level and the third transmission level to transmit power. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to propose a hybrid power system, so that the internal combustion engine can transmit power to the differential with high efficiency.

[0004] The embodiments of the present application propose a hybrid power system, comprising:

[0005] a planetary gear assembly, the planetary gear assembly comprising a sun gear, a carrier, a plurality of planet gears and a ring gear, the plurality of planet gears being rotatably connected to the carrier, the planet gears being engaged with both the sun gear and the ring gear;

[0006] an internal combustion engine, an output shaft of the internal combustion engine being torsionally connected to the carrier;

[0007] a differential;

[0008] an intermediate shaft, the intermediate shaft being arranged in parallel with the output shaft;

[0009] a first transmission level, the first transmission level comprising a first gear and a second gear, the first gear being torsionally connected to the carrier, the first gear and the carrier being coaxially arranged, the second gear being arranged on the intermediate shaft, the first gear and the second gear being engaged; and

[0010] a second transmission level, the second transmission level comprising a third gear and a fourth gear, the third gear being torsionally connected to the intermediate shaft, the fourth gear being connected to the differential, the third gear and the fourth gear being engaged,

[0011] the torque of the internal combustion engine can be transmitted to the differential via the carrier, the first transmission level, the intermediate shaft and the second transmission level.

[0012] In at least one possible embodiment, the hybrid power system further comprises a dual-rotor motor, the dual-rotor motor comprising a first motor unit and a second motor unit,

[0013] The first motor unit includes a first stator and an inner rotor, the inner rotor is disposed radially inward of the first stator, the inner rotor is torsionally connected to the sun gear,

[0014] The second motor unit is disposed radially outward of the first motor unit, the second motor unit includes a second stator and an outer rotor, the outer rotor is disposed radially outward of the second stator, the outer rotor is torsionally connected to the intermediate shaft via a third transmission stage.

[0015] In at least one possible implementation, the third transmission stage includes a fifth gear and a sixth gear, the fifth gear is torsionally connected to the outer rotor, the sixth gear is torsionally connected to the intermediate shaft, the fifth gear and the sixth gear are engaged.

[0016] In at least one possible implementation, the hybrid power system further includes a switching device, the switching device is capable of controlling the second gear and the intermediate shaft to be torsionally connected or to rotate independently of each other,

[0017] When the switching device is closed, the second gear and the intermediate shaft are torsionally connected, the internal combustion engine and the first motor unit are both capable of outputting power to the differential,

[0018] When the switching device is opened, the second gear and the intermediate shaft rotate independently of each other, the internal combustion engine and the first motor unit do not output power to the differential.

[0019] In at least one possible implementation, the switching device includes a clutch, the clutch is mounted on the second gear and the intermediate shaft.

[0020] In at least one possible implementation, the axes of the dual-rotor motor, the intermediate shaft and the half shafts of the differential are parallel to each other.

[0021] In at least one possible implementation, the axis of the inner rotor and the output shaft of the internal combustion engine are coaxial.

[0022] In at least one possible implementation, the first stator and the second stator share a stator core.

[0023] In at least one possible implementation, the hybrid power system further includes a damper, the output shaft of the internal combustion engine is connected to the planetary carrier via the damper.

[0024] In at least one possible implementation, the third transmission stage, the first transmission stage and the planetary gear assembly are arranged in an axial direction of an output shaft of the internal combustion engine, the first gear is sleeved on the output shaft of the inner rotor in a rotatable manner relative to the output shaft of the inner rotor, and the fifth gear is located between the first gear and the sun gear.

[0025] The third transmission stage, the first transmission stage and the second transmission stage are arranged in an axial direction of the intermediate shaft.

[0026] By adopting the technical scheme, power of the internal combustion engine can be transmitted to the differential through two-stage transmission of the first transmission stage and the second transmission stage, and transmission efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

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

[0028] Figure 2 A power path diagram of a hybrid power system according to an embodiment of the application in a pure electric drive mode is shown.

[0029] Figure 3 A power path diagram of a hybrid power system according to an embodiment of the application in a series mode is shown.

[0030] Figure 4 A power path diagram of a hybrid power system according to an embodiment of the application in an energy recovery mode is shown.

[0031] Figure 5 A power path diagram of a hybrid power system according to an embodiment of the application in a first engine drive mode is shown.

[0032] Figure 6 A power path diagram of a hybrid power system according to an embodiment of the application in a second engine drive mode is shown.

[0033] Figure 7 A power path diagram of a hybrid power system according to an embodiment of the application in a first parallel mode is shown.

[0034] Figure 8 A power path diagram of a hybrid power system according to an embodiment of the application in a second parallel mode is shown.

[0035] Figure 9 A power path diagram of a hybrid power system according to an embodiment of the application in a third parallel mode is shown.

[0036] REFERENCE SIGNS

[0037] 100 double rotor motor

[0038] 1. First motor unit 11. First stator 12. Inner rotor

[0039] 2. Second motor unit 21. Second stator 22. External rotor

[0040] 3 First transmission stage 31 First gear 32 Second gear

[0041] 4. Planetary Gear Assembly 41. Sun Gear 42. Planet Carrier 43. Planet Gears 44. Ring Gear

[0042] 5 Second transmission stage 51 Third gear 52 Fourth gear

[0043] 6 internal combustion engine 61 output shaft

[0044] 7 intermediate shaft 71 switching device

[0045] 8 Third transmission stage 81 Fifth gear 82 Sixth gear

[0046] 9 differentials and 91 half shafts

[0047] D shock absorber Detailed Implementation

[0048] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0049] like Figures 1 to 9 As shown, embodiments of this application propose a hybrid vehicle including a hybrid power system for driving the wheels or recovering power from the wheels. The hybrid power system includes a dual-rotor motor 100, a planetary gear assembly 4, a first transmission stage 3, a second transmission stage 5, a third transmission stage 8, an internal combustion engine 6, an intermediate shaft 7, a shock absorber D, and a differential 9.

[0050] The dual-rotor motor 100 includes a first motor unit 1 and a second motor unit 2, the second motor unit 2 can be disposed radially outward of the first motor unit 1, the first motor unit 1 and the second motor unit 2 are coaxially disposed. The first motor unit 1 includes a first stator 11 and an inner rotor 12, the inner rotor 12 can be disposed radially inward of the first stator 11, the second motor unit 2 includes a second stator 21 and an outer rotor 22, the outer rotor 22 can be disposed radially outward of the second stator 21, the second stator 21 can be disposed radially outward of the first stator 11, the inner rotor 12 and the outer rotor 22 are coaxially disposed. The first stator 11 and the second stator 21 can share one stator core.

[0051] The planetary gear assembly 4 includes a sun gear 41, a planet carrier 42, a plurality of planet gears 43 and a ring gear 44. The plurality of planet gears 43 are rotatably connected to the planet carrier 42 relative to the planet carrier 42, the sun gear 41 is located at the center of the ring gear 44, the plurality of planet gears 43 are arranged around the sun gear 41, the planet gears 43 are engaged with both the sun gear 41 and the ring gear 44. The sun gear 41 can be torsionally connected (i.e., capable of transmitting torque) to the rotor shaft of the inner rotor 12.

[0052] The output shaft 61 of the internal combustion engine 6 can be connected to the planet carrier 42, so as to transmit the power of the internal combustion engine 6 to the planet carrier 42, and then the power can be transmitted to the sun gear 41 through the planet carrier 42. Alternatively, the output shaft 61 of the internal combustion engine 6 can be connected to the planet carrier 42 via a damper D.

[0053] The axis of the dual-rotor motor 100 and the output shaft 61 of the internal combustion engine 6 are coaxial. The axis of the inner rotor 12 and the output shaft 61 of the internal combustion engine 6 are coaxial, and the axis of the outer rotor 22 and the output shaft 61 of the internal combustion engine 6 are coaxial. In this way, the dual-rotor motor 100 and the internal combustion engine 6 can be axially overlapped, occupying a smaller radial space, and the structure is compact.

[0054] The differential 9 can include half shafts 91, and the axis of the dual-rotor motor 100, the intermediate shaft 7 and the half shafts 91 can be arranged parallel to each other. The power of the internal combustion engine 6 can be transmitted to the differential 9 via the intermediate shaft 7.

[0055] The first transmission stage 3 can be arranged between the planet carrier 42 and the intermediate shaft 7, so that the power can be transmitted from the planet carrier 42 to the intermediate shaft 7 through the first transmission stage 3. The first transmission stage 3 can be a gear pair, and the first transmission stage 3 includes a first gear 31 and a second gear 32. The first gear 31 can be torsionally connected to the planet carrier 42, and the first gear 31 and the planet carrier 42 can be coaxially arranged, the second gear 32 can be sleeved on the intermediate shaft 7, and the first gear 31 and the second gear 32 are engaged, so that the power output by the internal combustion engine 6 can be transmitted to the intermediate shaft 7 through the first transmission stage 3.

[0056] The second transmission stage 5 can be arranged between the differential 9 and the intermediate shaft 7, so that the power can be transmitted from the intermediate shaft 7 to the differential 9 through the second transmission stage 5. The second transmission stage 5 can be a gear pair, which comprises a third gear 51 and a fourth gear 52. The third gear 51 can be connected to the intermediate shaft 7, and the fourth gear 52 can be connected to the differential 9, for example, can be connected to the housing of the differential 9 in a torsion-proof manner. The third gear 51 and the fourth gear 52 are engaged, so that the rotation and the torque of the intermediate shaft 7 can be transmitted to the differential 9 through the second transmission stage 5.

[0057] The third transmission stage 8 can be arranged between the second motor unit 2 and the intermediate shaft 7, so that the power can be transmitted from the second motor unit 2 to the intermediate shaft 7 through the third transmission stage 8. The third transmission stage 8 can be a gear pair, which comprises a fifth gear 81 and a sixth gear 82. The fifth gear 81 can be connected to the outer rotor 22 in a torsion-proof manner, and the sixth gear 82 can be connected to the intermediate shaft 7 in a torsion-proof manner. The fifth gear 81 and the sixth gear 82 are engaged, so that the power output by the second motor unit 2 can be transmitted to the intermediate shaft 7 through the third transmission stage 8.

[0058] The third transmission stage 8, the first transmission stage 3 and the planetary gear assembly 4 can be arranged in the axial direction of the output shaft 61 of the internal combustion engine 6. In the axial direction of the internal combustion engine 6, the first gear 31 can be located between the fifth gear 81 and the sun gear 41. The first gear 31 can be rotatably sleeved on the output shaft of the inner rotor relative to the output shaft of the inner rotor.

[0059] Alternatively, the third transmission stage 8, the first transmission stage 3 and the second transmission stage 5 can be arranged in the axial direction of the intermediate shaft 7.

[0060] Further, the intermediate shaft 7 can be provided with a switching device 71, which can control the second gear 32 and the intermediate shaft 7 to be connected in a torsion-proof manner or to rotate independently of each other.

[0061] The switching device 7 can be in the form of a clutch or a locking mechanism, etc. For example, the clutch can be installed between the second gear 32 and the intermediate shaft 7. The clutch can comprise a driving part and a driven part. The driving part can be fixedly connected to the intermediate shaft 7, and the driven part can be fixedly connected to the second gear 32. The second gear 32 can be sleeved on the intermediate shaft 7, and the second gear 32 and the intermediate shaft 7 can rotate relative to each other.

[0062] It can be understood that, according to the operating mode of the hybrid power system, the driving part is not always actively acting, and the driven part is not always driven by the driving part. The master-slave relationship of the two and their names do not have an inevitable connection.

[0063] With the clutch as an example, when the switch device 71 is closed, the driving part and the driven part are engaged and can move together, the clutch is in the engaged state, the second gear 32 and the intermediate shaft 7 are torsionally connected, the second gear 32 and the intermediate shaft 7 can synchronously rotate together, the power can be transmitted between the planet carrier 42 and the intermediate shaft 7, and the internal combustion engine 6 and the first motor unit 1 can output power to the differential 9.

[0064] When the switch device 71 is opened, the driving part and the driven part are separated and can move separately, the clutch is in the disengaged state, the second gear 32 and the intermediate shaft 7 rotate independently of each other, the power cannot be transmitted between the planet carrier 42 and the intermediate shaft 7, and neither the internal combustion engine 6 nor the first motor unit 1 can output power to the differential 9.

[0065] Regardless of the state of the switch device 71, the second motor unit 2 can output power to the differential 9 through the third transmission stage 8 and the second transmission stage 5.

[0066] It can be understood that, in the above introduction of the first transmission stage 3, the second transmission stage 5 and the third transmission stage 8, the power transmission path is described by taking the dual-rotor motor 100 as an example. However, in actual use scenarios, the dual-rotor motor 100 can be used as a generator to convert kinetic energy of the wheels into electrical energy, and at this time the power transmission path is reversed.

[0067] The following will be described with reference to Figures 2 to 9 introduction of several working modes of the hybrid power system, wherein the one-way arrow represents the power transmission path.

[0068] As shown in Figure 2 , in the pure electric driving mode, the switch device 71 is opened, and the second motor unit 2 transmits power to the differential 9 through the third transmission stage 8 and the second transmission stage 5.

[0069] As shown in Figure 3 , in the series mode, the switch device 71 is opened, and the second motor unit 2 transmits power to the differential 9 through the third transmission stage 8 and the second transmission stage 5; and the internal combustion engine 6 transmits power to the first motor unit 1 through the planetary gear assembly 4, and the first motor unit 1 generates electricity.

[0070] As shown in Figure 4 , in the energy recovery mode, the switch device 71 is opened, and the power of the differential 9 (i.e., the power from the wheels) is transmitted to the second motor unit 2 through the second transmission stage 5 and the third transmission stage 8, and the second motor unit 2 generates electricity.

[0071] As shown in Figure 5 , in the engine first driving mode, the switch device 71 is closed, and the internal combustion engine 6 transmits power to the differential 9 through the planet carrier 42 (without passing through the planet gear 43), the first transmission stage 3 and the second transmission stage 5.

[0072] like Figure 6 As shown, in the second drive mode of the engine, the switch device 71 is closed, and the internal combustion engine 6 transmits power to the differential 9 through the planetary carrier 42 (without passing through the planetary gears 43), the first transmission stage 3, and the second transmission stage 5. Furthermore, the internal combustion engine 6 transmits power to the first motor unit 1 through the planetary carrier 42 and the sun gear 41, and the first motor unit 1 generates electricity.

[0073] like Figure 7 As shown, in the first parallel mode, the switch 71 is closed, and the internal combustion engine 6 transmits power to the differential 9 through the planetary carrier 42 (without passing through the planetary gears 43), the first transmission stage 3, and the second transmission stage 5. The second motor unit 2 also transmits power to the differential 9 through the third transmission stage 8 and the second transmission stage 5. The first motor unit 1 can rotate together with the differential 9, but does not drive it (this can also be referred to as the first motor unit 1 following).

[0074] like Figure 8 As shown, in the second parallel mode, the switch 71 is closed, and the internal combustion engine 6 transmits power to the differential 9 through the planetary carrier 42 (without passing through the planetary gears 43), the first transmission stage 3, and the second transmission stage 5. The second motor unit 2 also transmits power to the differential 9 through the third transmission stage 8 and the second transmission stage 5. The first motor unit 1 transmits power to the differential 9 through the sun gear 41, planetary gears 43, the first transmission stage 3, and the second transmission stage 5.

[0075] like Figure 9 As shown, in the third parallel mode, the switch 71 is closed, and the internal combustion engine 6 transmits a portion of its power to the differential 9 via the planetary carrier 42 (without passing through the planetary gears 43), the first transmission stage 3, and the second transmission stage 5. The internal combustion engine 6 also transmits another portion of its power to the first motor unit 1 via the planetary gear assembly 4. The first motor unit 1 can absorb the remaining power from the internal combustion engine 6 for power generation. Furthermore, the second motor unit 2 transmits power to the differential 9 via the third transmission stage 8 and the second transmission stage 5.

[0076] The hybrid power system of this application can switch between multiple operating modes as needed. The power from the internal combustion engine 6 is transmitted to the differential 9 only through the first transmission stage 3 and the second transmission stage 5, resulting in a compact structure, high transmission efficiency, and minimal power loss. Furthermore, the power transmission between the first motor unit 1 and the differential 9 passes through the planetary gear assembly 4, bypassing the third transmission stage 8; the power transmission between the second motor unit 2 and the differential 9 passes through the third transmission stage 8, bypassing the planetary gear assembly 4. The transmission ratios of the output power of the first motor unit 1 and the second motor unit 2 can be designed independently, simplifying the design process.

[0077] It should be understood that at least part or a feature of the above-described embodiments, examples, or aspects can be appropriately combined.

[0078] It can be understood that, in the present application, when the number of components or members is not particularly limited, the number can be one or more, and the plurality herein refers to two or more. For the case where the number of components or members is described as a specific number, such as two, three, four, etc. in the drawings and / or the description, the specific number is generally exemplary and not limiting, 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.

[0079] In the present application, unless otherwise explicitly stated or limited, the terms "mounting", "assembly", "assembly", "connection", "connection", "coupling", "connection", "abutment", "communication", "communication", "conduction", "fixing", "fastening", and the like should be understood broadly, for example, it can be direct or indirect. For example, in terms of connection, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication or interaction relationship between two elements, unless otherwise explicitly stated or limited. For example, in terms of communication / conduction, etc., it can be direct communication / conduction, or indirect communication / conduction via an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0080] In the present application, unless otherwise explicitly stated or limited, one member is disposed in / installed in / located in / contained in / placed in another member, etc. can be any of the following two cases: a part or most of the one member is located in the other member; and the one member is completely contained in the other member.

[0081] Although the present application has been described in detail using the above-described embodiments, it is clear to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as a modified embodiment without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in the present specification is for the purpose of example and does not have any limiting meaning on the present application.

Claims

1. A hybrid system characterized by comprising: Comprise: a planetary gear assembly including a sun gear, a carrier, a plurality of planetary gears rotatably connected to the carrier, the planetary gears being engaged with both the sun gear and a ring gear; an internal combustion engine, an output shaft of the internal combustion engine being torsionally connected to the carrier; a differential; a countershaft, the countershaft and the output shaft being arranged in parallel; a first transmission stage including a first gear and a second gear, the first gear being torsionally connected to the carrier, the first gear and the carrier being coaxially arranged, the second gear being arranged on the countershaft, the first gear and the second gear being engaged; and a second transmission stage including a third gear and a fourth gear, the third gear being torsionally connected to the countershaft, the fourth gear being connected to the differential, the third gear and the fourth gear being engaged, a torque of the internal combustion engine being transmittable to the differential via the carrier, the first transmission stage, the countershaft and the second transmission stage.

2. The hybrid system according to claim 1, characterized by The hybrid system further comprises a dual rotor electric machine including a first electric machine unit and a second electric machine unit, the first electric machine unit including a first stator and an inner rotor, the inner rotor being arranged radially inside the first stator, the inner rotor being torsionally connected to the sun gear, the second electric machine unit being arranged radially outside the first electric machine unit, the second electric machine unit including a second stator and an outer rotor, the outer rotor being arranged radially outside the second stator, the outer rotor being torsionally connected to the countershaft via a third transmission stage.

3. The hybrid system according to claim 2, characterized by The third transmission stage includes a fifth gear and a sixth gear, the fifth gear being torsionally connected to the outer rotor, the sixth gear being torsionally connected to the countershaft, the fifth gear and the sixth gear being engaged.

4. The hybrid system according to claim 2, characterized by The hybrid system further comprises a switching device, the switching device being capable of controlling the second gear and the countershaft to be torsionally connected or to be rotatable independently of each other, when the switching device is closed, the second gear and the countershaft are torsionally connected, both the internal combustion engine and the first electric machine unit being capable of outputting power to the differential, when the switching device is open, the second gear and the countershaft are rotatable independently of each other, neither the internal combustion engine nor the first electric machine unit outputting power to the differential.

5. The hybrid system according to claim 4, characterized by The switching device includes a clutch, the clutch being mounted to the second gear and the countershaft.

6. The hybrid system of claim 2, wherein, Axes of the dual rotor electric machine, the countershaft and half shafts of the differential are parallel to each other.

7. The hybrid system of claim 2, wherein, An axis of the inner rotor and an output shaft of the internal combustion engine are coaxial.

8. The hybrid system of claim 2, wherein, The first stator and the second stator share a stator core.

9. The hybrid system of claim 1, wherein, The hybrid system further comprises a damper, the output shaft of the internal combustion engine being connected to the carrier via the damper.

10. The hybrid system according to claim 3, characterized by The third transmission stage, the first transmission stage and the planetary gear assembly are arranged in an axial direction of an output shaft of the internal combustion engine, the first gear being rotatably sleeved to the output shaft of the inner rotor relative to the output shaft of the inner rotor between the fifth gear and the sun gear; The third transmission stage, the first transmission stage and the second transmission stage are arranged in an axial direction of the intermediate shaft.

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