Gearbox and hybrid power system

Abstract

The utility model provides a gear box and a hybrid power system, the gear box comprises a first planet wheel assembly, the first planet wheel assembly comprises a first sun wheel, a first planet carrier, a plurality of first planet wheels and a first gear ring, the plurality of first planet wheels are rotatably connected to the first planet carrier relative to the first planet carrier, and the first gear ring is rotatably connected to the first sun wheel; the first planet gear is meshed with the first sun gear and the first gear ring; the second planet wheel assembly comprises a second sun wheel, a second planet carrier, a plurality of second planet wheels and a second gear ring, the second planet wheels can be rotationally connected to the second planet carrier relative to the second planet carrier, and the second planet wheels are meshed with the second sun wheel and the second gear ring; the first sun gear and the second sun gear are coaxially arranged; and the first planet carrier and the second planet carrier are separably connected through the clutch, so that torque can be transmitted between the first planet carrier and the second planet carrier or the first planet carrier and the second planet carrier rotate independently.

Description

Technical Field

[0001] This application belongs to the field of hybrid vehicles, and particularly relates to a gearbox and a hybrid power system. Background Technology

[0002] CN114761265A proposes a drive unit and drive assembly, wherein the internal combustion engine and the first electric rotating machine are not coaxial, nor are the internal combustion engine and the second electric rotating machine. Furthermore, when the internal combustion engine outputs power to the differential transmission device, the power needs to be transmitted through three stages: a first transmission stage, a second transmission stage, and a third transmission stage. Utility Model Content

[0003] This application aims to provide a gearbox that achieves high-efficiency power transmission. This application also proposes a hybrid power system including a gearbox.

[0004] This application provides a gearbox comprising:

[0005] The first planetary gear assembly includes a first sun gear, a first planet carrier, a plurality of first planet gears, and a first ring gear. The plurality of first planet gears are rotatably connected to the first planet carrier relative to the first planet carrier, and the first planet gears mesh with both the first sun gear and the first ring gear.

[0006] The second planetary gear assembly includes a second sun gear, a second planet carrier, a plurality of second planet gears, and a second ring gear. The plurality of second planet gears are rotatably connected to the second planet carrier relative to it. Each second planet gear meshes with both the second sun gear and the second ring gear. The first sun gear and the second sun gear are arranged coaxially.

[0007] The clutch allows the first planetary carrier and the second planetary carrier to be disengaged, thereby enabling the transmission of torque between the first planetary carrier and the second planetary carrier or their independent rotation.

[0008] In at least one possible implementation, the gearbox further includes a differential and a gear transmission mechanism.

[0009] The gear transmission mechanism is disposed on the first planetary carrier. The gear transmission mechanism consists of a gear pair, which includes a first gear and a second gear that mesh with each other. The first gear is torsionally connected to the first planetary carrier, and the second gear is the input gear of the differential.

[0010] This application also proposes a hybrid power system, comprising:

[0011] The gearbox described in any of the above technical solutions;

[0012] A motor, which is connected to the first sun gear of the first planetary gear assembly; and

[0013] An internal combustion engine, wherein the output shaft of the internal combustion engine is connected to the second planetary carrier for transmitting power from the internal combustion engine to the second planetary carrier.

[0014] In at least one possible implementation, the differential is provided with a half-shaft, the central axis of which is parallel to the central axis of the first sun gear and the central axis of the second sun gear.

[0015] In at least one possible implementation, the hybrid power system includes a dual-rotor motor, which comprises a first motor unit and a second motor unit.

[0016] The first motor unit includes a first stator and an inner rotor. The inner rotor is disposed radially inside the first stator and is torsionally connected to the second sun gear.

[0017] The second motor unit is disposed radially outside the first motor unit. The second motor unit includes a second stator and an outer rotor. The outer rotor is disposed radially outside the second stator and is torsionally connected to the first sun gear.

[0018] In at least one possible implementation, the axis of the inner rotor and the output shaft of the internal combustion engine are coaxial.

[0019] In at least one possible implementation, the first stator and the second stator are conjugate stators.

[0020] In at least one possible implementation, the hybrid power system further includes a shock absorber, through which the output shaft of the internal combustion engine is connected to the second planetary carrier.

[0021] In at least one possible implementation, the first planetary gear assembly is located axially between the dual-rotor motor and the second planetary gear assembly in the hybrid power system.

[0022] In at least one possible implementation, when viewed radially along at least one direction of the hybrid power system, the differential overlaps with either the first planetary gear assembly or the second planetary gear assembly.

[0023] By adopting the above technical solution and controlling the clutch to be in the engaged state, power can be transmitted between the first planetary carrier and the second planetary carrier with high efficiency. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of a hybrid power system according to an embodiment of this application is shown.

[0025] Explanation of reference numerals in the attached figures

[0026] 100 twin rotor motor

[0027] 1. First motor unit 11. First stator 12. Inner rotor

[0028] 2. Second motor unit 21. Second stator 22. External rotor

[0029] 3-clutch

[0030] 4. First planetary gear assembly; 41. First sun gear; 42. First planet carrier; 43. First planet gear; 44. First ring gear.

[0031] 5. Second planetary gear assembly; 51. Second sun gear; 52. Second planetary carrier; 53. Second planetary gear; 54. Second ring gear.

[0032] 6 internal combustion engine 61 output shaft

[0033] 7 shock absorbers

[0034] 8. Gear transmission mechanism 81 First gear 82 Second gear

[0035] 9 differentials and 91 half shafts Detailed Implementation

[0036] 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.

[0037] like Figure 1 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 gearbox, an internal combustion engine 6, a shock absorber 7, and a differential 9.

[0038] 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 outside the first motor unit 1, and the first motor unit 1 and the second motor unit 2 are coaxially arranged. The first motor unit 1 includes a first stator 11 and an inner rotor 12, which can be disposed radially inside the first stator 11. The second motor unit 2 includes a second stator 21 and an outer rotor 22, which can be disposed radially outside the second stator 21, and the second stator 21 can be disposed radially outside the first stator 11. Optionally, the first stator 11 and the second stator 21 can be conjugate stators, that is, they share a common stator core.

[0039] The gearbox includes a clutch 3, a first planetary gear assembly 4, a second planetary gear assembly 5, and a gear transmission mechanism 8. The clutch 3 may be located between the first planetary gear assembly 4 and the second planetary gear assembly 5.

[0040] The first planetary gear assembly 4 includes a first sun gear 41, a first planet carrier 42, a plurality of first planet gears 43, and a first ring gear 44. The plurality of first planet gears 43 are rotatably connected to the first planet carrier 42 relative to it. The first sun gear 41 is located at the center of the first ring gear 44, and the plurality of first planet gears 43 surround the first sun gear 41. The first planet gears 43 mesh with both the first sun gear 41 and the first ring gear 44. The first sun gear 41 is torsionally (i.e., capable of transmitting torque) connected to the rotor shaft of the outer rotor 22.

[0041] The second planetary gear assembly 5 includes a second sun gear 51, a second planet carrier 52, a plurality of second planet gears 53, and a second ring gear 54. The plurality of second planet gears 53 are rotatably connected to the second planet carrier 52 relative to it. The second sun gear 51 is located at the center of the second ring gear 54, and the plurality of second planet gears 53 surround the second sun gear 51. The second planet gears 53 mesh with both the second sun gear 51 and the second ring gear 54. The second sun gear 51 is torsionally (i.e., capable of transmitting torque) connected to the rotor shaft of the inner rotor 12. The first sun gear 41 and the second sun gear 51 are arranged coaxially.

[0042] The first planetary carrier 42 and the second planetary carrier 52 can be disengaged and connected via the clutch 3. When the clutch 3 is engaged, the first planetary carrier 42 and the second planetary carrier 52 are connected and can transmit torque, allowing them to rotate synchronously. When the clutch 3 is disengaged, the first planetary carrier 42 and the second planetary carrier 52 rotate independently and can have different speeds.

[0043] The first planetary gear assembly 4 and the second planetary gear assembly 5 are coaxially arranged. In the axial direction of the gearbox, the first planetary gear assembly 4 is located on the side closest to the dual-rotor motor 100. Figure 1 (Left side of the middle), the second planetary gear assembly 5 is located on the side near the internal combustion engine 6 ( Figure 1 (Right side of the image). Axially, the first planetary gear assembly 4 is located between the dual-rotor motor 100 and the second planetary gear assembly 5.

[0044] The output shaft 61 of the internal combustion engine 6 can be connected to the second planetary carrier 52, thereby transmitting power from the internal combustion engine 6 to the second planetary carrier 52. Optionally, the output shaft 61 of the internal combustion engine 6 can be connected to the second planetary carrier 52 via a shock absorber 7.

[0045] The axis of the dual-rotor motor 100 is coaxial with the output shaft 61 of the internal combustion engine 6. The axis of the inner rotor 12 is coaxial with the output shaft 61 of the internal combustion engine 6, and the axis of the outer rotor 22 is coaxial with the output shaft 61 of the internal combustion engine 6. This allows the dual-rotor motor 100 and the internal combustion engine 6 to overlap axially, occupying less radial space and resulting in a compact structure.

[0046] The differential 9 can be connected to the first planetary carrier 42 via a transmission mechanism (e.g., gear transmission mechanism 8) to transmit power to the differential 9. The differential 9 may be provided with a half-shaft 91.

[0047] The gear transmission mechanism 8 can be a gear pair, including a first gear 81 and a second gear 82. The first gear 81 can be torsionally connected to the first planetary carrier 42, and the second gear 82 can be the input gear of the differential 9, for example, it can be torsionally connected to the housing of the differential 9. The first gear 81 and the second gear 82 mesh.

[0048] Viewed along at least one radial direction of the hybrid system, the differential 9 and the first planetary gear assembly 4 or the second planetary gear assembly 5 overlap, and the hybrid system is axially compact.

[0049] Ignoring the shafts of the first planetary gear 43 and the second planetary gear 53, the hybrid power system can be considered to have two parallel and offset shafts: one is the shaft of the dual-rotor motor 100, the first planetary gear assembly 4, the second planetary gear assembly 5, and the internal combustion engine 6, which are coaxial; the other is the half-shaft 91 of the differential 9. These two shafts can occupy less radial space, making the hybrid power system more compact.

[0050] It is understood that the two axes mentioned here are merely an abstract description for the convenience of illustrating the radial spatial layout. In reality, a single axis may include multiple axes; for example, the output shaft of the first motor unit 1 and the central shaft of the first sun gear 41 of the first planetary gear assembly 4 may be two nested shafts. The differential 9 may include two half-shafts 91.

[0051] When the internal combustion engine 6 outputs power to the differential 9, the clutch 3 is engaged. The internal combustion engine 6 drives the second planetary carrier 52 to rotate, and through the clutch 3 drives the first planetary carrier 42 to rotate. The first planetary carrier 42 and the second planetary carrier 52 can rotate synchronously. Then, the power is transmitted to the differential 9 through a transmission mechanism (e.g., gear transmission mechanism 8). The power of the internal combustion engine 6 can be transmitted to the differential 9 through a single stage of transmission, resulting in a compact structure, high transmission efficiency, and minimal power loss.

[0052] The torque of the second motor unit 2 can be transmitted to the differential 9 via the first planetary gear assembly 4 and the gear transmission mechanism 8.

[0053] When clutch 3 is disengaged, the torque of internal combustion engine 6 can be transmitted to first motor unit 1 via second planetary gear assembly 5, thereby driving first motor unit 1 to generate electricity. Alternatively, the torque of first motor unit 1 can be transmitted to internal combustion engine 6 via second planetary gear assembly 5, thereby starting internal combustion engine 6.

[0054] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0055] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0056] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0057] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or incorporated in another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0058] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. A gear box, characterized in that, The gear box comprises: a first planetary gear assembly comprising a first sun gear, a first carrier, a plurality of first planetary gears rotatably connected to the first carrier, the first planetary gears being engaged with both the first sun gear and a first ring gear; a second planetary gear assembly comprising a second sun gear, a second carrier, a plurality of second planetary gears rotatably connected to the second carrier, the second planetary gears being engaged with both the second sun gear and a second ring gear, the first sun gear and the second sun gear being coaxially arranged; and a clutch, the first carrier and the second carrier being detachably connected by the clutch, so that torque can be transmitted between the first carrier and the second carrier or the first carrier and the second carrier can rotate independently. The gear box further comprises a differential and a gear transmission mechanism, 2. The gear case of claim 1, wherein, the gear transmission mechanism being arranged on the first carrier, the gear transmission mechanism being composed of one gear pair, the one gear pair comprising a first gear and a second gear engaged with each other, the first gear being torsionally connected to the first carrier, the second gear being an input gear of the differential. The gear box comprises:

3. A hybrid system characterized by, the gear box according to claim 1 or 2; an electric machine connected to the first sun gear of the first planetary gear assembly; and an internal combustion engine, an output shaft of the internal combustion engine being connected to the second carrier for transmitting power of the internal combustion engine to the second carrier. The differential of the gear box is provided with a half shaft, the half shaft being parallel to central axes of the first sun gear and the second sun gear. The hybrid power system comprises a dual-rotor electric machine, the dual-rotor electric machine comprising a first electric machine unit and a second electric machine unit, 4. The hybrid system according to claim 3, characterized by the first electric machine unit comprising a first stator and an inner rotor, the inner rotor being arranged on a radially inner side of the first stator, the inner rotor being torsionally connected to the second sun gear, 5. The hybrid system according to claim 3, characterized by the second electric machine unit being arranged on a radially outer side of the first electric machine unit, the second electric machine unit comprising a second stator and an outer rotor, the outer rotor being arranged on a radially outer side of the second stator, the outer rotor being torsionally connected to the first sun gear. An axis of the inner rotor is coaxial with an output shaft of the internal combustion engine. The first stator and the second stator are conjugate stators.

6. The hybrid system according to claim 5, characterized by The hybrid power system further comprises a damper, the output shaft of the internal combustion engine being connected to the second carrier via the damper.

7. The hybrid system according to claim 5, characterized by In an axial direction of the hybrid power system, the first planetary gear assembly is located between the dual-rotor electric machine and the second planetary gear assembly.

8. The hybrid system according to claim 3, characterized by In at least one radial direction of the hybrid power system, the differential of the gear box and the first planetary gear assembly or the second planetary gear assembly overlap.

9. The hybrid system according to claim 5, characterized by ​ 10. The hybrid system according to claim 5, characterized by ​

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