Dual-motor coaxial longitudinal hybrid power transmission system, assembling method thereof and vehicle

Abstract

The application provides a coaxial longitudinal hybrid power transmission system with double motors, a hollow shaft is used as a driving motor shaft, an assembly output shaft is arranged in the driving motor shaft, one end of the assembly output shaft is inserted into a generator shaft and connected with the generator shaft, the other end of the assembly output shaft is connected with an axle, the driving motor shaft is connected with a transmission system of a gearbox. The winding of the driving motor protrudes axially towards the generator, and the winding of the generator protrudes axially towards the driving motor, so that a containing space is formed between the stator of the driving motor and the stator of the generator, and a clutch is arranged in the containing space. The assembly output shaft is supported on the generator shaft and the driving motor shaft through bearings, and is supported on a housing through a fifth bearing. The coaxial longitudinal P1+P3 hybrid gearbox system architecture of the application is simple and compact, and is applied to a vehicle with a longitudinal rear drive / four-wheel drive engine, so that the hybridization modification of an existing fuel vehicle platform is realized.

Description

Technical Field

[0001] This invention relates to the field of vehicle transmission system technology, and in particular to a dual-motor coaxial longitudinal hybrid power transmission system, its assembly method, and a vehicle thereof. Background Technology

[0002] Vehicles equipped with longitudinally mounted transmissions typically require rear-wheel drive / four-wheel drive and have a longitudinally mounted engine. Common models with longitudinally mounted transmissions include mid-to-large sedans (C-segment and above), high-end urban SUVs, and rugged off-road vehicles. Commercial vehicles using longitudinally mounted transmissions generally employ rear-wheel drive and longitudinal layouts, such as pickup trucks, cab-over light trucks, and vans with non-unibody construction. Currently, the P1+P3 architecture-based hybrid transmission has become the main hybrid technology route. However, these hybrid transmissions are currently designed based on front-wheel drive transverse platforms and are geared towards most passenger vehicles, without addressing the rear-wheel drive needs of commercial vehicles such as pickup trucks, light trucks, and enclosed vans when considering load-bearing requirements.

[0003] Patent 201810966176.0 presents a longitudinally mounted P1+P3 architecture, but the generator and drive motor are not coaxial, and two synchronizers are used for shifting, which differs from the single-gear, coaxial, clutch-based shifting structure of this application. Patent 202110327803.8 presents a coaxial P1+P3 architecture, using a clutch for parallel switching and a synchronizer for engine shifting, but the engine in this patent has a two-gear design, unlike the direct-drive design of this application. Patent 202110518892.4 presents a coaxial P1+P3 architecture and uses a clutch for series-parallel switching, but the arrangement of the gearbox, generator, and drive motor differs from that of this application. Summary of the Invention

[0004] In order to overcome the above-mentioned technical defects, the purpose of this invention is to provide a dual-motor coaxial longitudinal hybrid power transmission system suitable for P1+P3 hybrid transmission system architecture, its assembly method, and vehicle.

[0005] This invention discloses a dual-motor coaxial longitudinal hybrid power transmission system, including a drive motor, a generator, and a gearbox. The drive motor is located between the generator and the gearbox. The drive motor shaft is a hollow shaft, with an assembly output shaft passing through it. One end of the drive motor shaft is inserted into and connected to the generator shaft, and the other end is connected to the axle. The engine is connected to the generator shaft, thereby transmitting power from the engine to the generator shaft, allowing the generator to drive the drive motor and thus the axle via electrical energy. The drive motor shaft is connected to the transmission system of the gearbox. A clutch is provided between the generator and the drive motor. When the clutch is engaged, the generator shaft is connected to the assembly output shaft, allowing part of the engine's power to be transmitted to the axle via the generator shaft. The assembly output shaft transmits part of the engine's power to the generator shaft, which then drives the drive motor via electrical energy. The drive motor's power is transmitted to the assembly output shaft through the transmission system. The drive motor's windings protrude axially towards the generator side, and the generator's windings protrude axially towards the drive motor side, thus forming an accommodating space between the stator of the drive motor and the stator of the generator. The clutch is located within this accommodating space. Both ends of the generator shaft are supported on the assembly housing by first bearings, both ends of the drive motor shaft are supported on the assembly housing by second bearings, the assembly output shaft is supported on the generator shaft by a third bearing, on the drive motor shaft by a fourth bearing, and on the housing by a fifth bearing.

[0006] Preferably, the housing includes a generator housing that houses the generator, a drive motor housing that houses the drive motor, and a gearbox housing; the generator and the drive motor have the same radial dimension, so the generator housing and the drive motor housing have the same radial dimension; the assembly output shaft is supported on the gearbox housing by a fifth bearing.

[0007] Preferably, the transmission system is a planetary gear train, wherein the sun gear of the planetary gear train is connected to the drive motor shaft, the planet carrier of the planetary gear train is connected to the assembly output shaft, and the sun gear and the planet carrier are respectively meshed with the planet gears, thereby coupling the sun gear and the planet carrier; the radial dimensions of the generator housing, the drive motor housing, and the gearbox housing are the same.

[0008] Preferably, the transmission system is a two-stage parallel gear system, which includes a transmission shaft, a large gear and a small gear mounted on the transmission shaft. The large gear meshes with the input shaft gear and is connected to the drive motor shaft, and the small gear meshes with the main reduction gear and is connected to the assembly output shaft. The transmission shaft is parallel to the assembly output shaft.

[0009] Preferably, the reduction ratio of the transmission system is 3-4.

[0010] Preferably, the clutch is an electromagnetic clutch; the right end of the generator shaft is provided with a first tooth, the left end of the assembly output shaft is provided with a toothed disc, and the toothed disc is provided with a second tooth that engages with the first tooth; an electromagnetic coil is sleeved on the assembly output shaft, and the electromagnetic coil is mounted on the drive motor shaft through a coil bracket. When the electromagnetic coil is energized, the electromagnetic coil pushes the toothed disc closer to the first tooth until it engages with the first tooth, thereby connecting the generator shaft to the assembly output shaft.

[0011] This invention also discloses an assembly method for a dual-motor coaxial longitudinal hybrid transmission, used to assemble the aforementioned dual-motor coaxial longitudinal hybrid transmission system, comprising: connecting the generator rotor assembly to the front end cover; then assembling the generator stator assembly to the generator rotor assembly, and connecting the generator housing to the front end cover; assembling and connecting the assembly output shaft to the generator; then assembling the drive motor rotor assembly equipped with the clutch onto the assembly output shaft; assembling the drive motor stator assembly to the drive motor rotor assembly, and installing the drive motor housing, so that the drive motor housing is fixedly connected to the generator housing; assembling the transmission system; and finally installing the gearbox housing, so that the gearbox housing is fixedly connected to the drive motor housing to complete the gearbox assembly.

[0012] The present invention also discloses a vehicle including the above-described dual-motor coaxial longitudinal hybrid powertrain system.

[0013] Compared with existing technologies, the above technical solution has the following advantages:

[0014] 1. The coaxial longitudinal P1+P3 hybrid transmission system architecture of the present invention has a simple and compact structure and is applied to vehicles with longitudinally mounted rear-wheel drive / four-wheel drive engines to realize the hybrid transformation of existing fuel vehicle platforms. The drive motor shaft is set as a hollow shaft, and the assembly output shaft passes through the drive motor shaft. One end is connected to the generator shaft and the other end is connected to the axle. The assembly output shaft is supported on the housing (transmission housing) and also supported on the generator shaft and drive motor shaft through bearings, and thus supported on the housing.

[0015] 2. The clutch of the present invention is located within the original space formed between the generator winding and the drive motor winding, without occupying additional axial space, thereby reducing the overall axial dimension of the system; and by setting the drive motor housing and the generator housing to have the same radial dimension, the system has a high degree of external cleanliness and can reduce mold costs.

[0016] 3. By providing a toothed clutch at the right end of the generator shaft to act as a jaw clutch disc and engage with the jaw clutch disc on the assembly output shaft, the present invention eliminates the need for a separate jaw clutch structure, reduces the number of parts, and reduces the connection structure used to connect the jaw clutch. Furthermore, if a separate jaw clutch (in the prior art) is used, the third and fourth bearings of the present invention, which support the assembly output shaft, will not be supported, leading to assembly difficulties. Therefore, the present invention makes assembly possible by adopting the above-mentioned clutch structure. Attached Figure Description

[0017] Figure 1 The transmission system provided by this invention is a hybrid power transmission system of planetary gear trains;

[0018] Figure 2 The transmission system provided by this invention is a hybrid power transmission system with a two-stage parallel gear system;

[0019] Figure 3 A schematic diagram of the assembly steps of the hybrid powertrain system provided by the present invention.

[0020] Wherein: 1-Generator, 101-Generator rotor assembly, 102-Generator stator assembly, 103-Generator shaft, 2-Drive motor, 201-Drive motor rotor assembly, 202-Drive motor stator assembly, 203-Drive shaft, 3-Planetary gear train, 301-Sun gear, 302-Planet gears, 303-Planet carrier, 304-Ring gear, 4-Two-stage parallel gear train, 401-Drive shaft, 402-Large gear, 403-Small gear, 404-Input shaft gear, 405-Main reduction gear, 5-Assembly output shaft, 6-Front end cover, 7-Generator housing, 8-Drive motor housing, 9-Gearbox housing, 10-Electromagnetic clutch, 1001-Coil bracket, 1002-Electromagnetic coil, 1003-Gear clutch, 11-First bearing, 12-Second bearing, 13-Third bearing, 14-Fourth bearing, 15-Fifth bearing, 16-Sixth bearing. Detailed Implementation

[0021] The advantages of the present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments.

[0022] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0023] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0024] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0025] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0027] In the following description, suffixes such as "module," "part," or "unit" used to denote elements are used only for the convenience of the description of the invention and have no specific meaning in themselves. Therefore, "module" and "part" can be used interchangeably.

[0028] See appendix Figure 1-2This invention discloses a dual-motor coaxial longitudinal hybrid powertrain system applied to a hybrid powertrain system with a P1+P3 hybrid transmission. P1 is a generator 1, and P3 is a drive motor 2. The engine is normally connected to the generator 1, and the drive motor 2 is connected to the engine via a clutch. The drive motor 2 is also connected to the vehicle's wheels to output power and drive them. Not shown in the transmission system of this figure, the generator 1 is also connected to the drive motor 2 to supply power to it, enabling it to drive the wheels. In the clutch-disengaged state (often referred to as series mode), the engine's power is transmitted only to the generator 1, which then generates electricity and transmits it to the drive motor 2, thereby driving the wheels. In the clutch-engaged state (often referred to as parallel mode), part of the engine's power is transmitted to the generator 1 (which then generates electricity and transmits it to the drive motor 2), and part of the power is also transmitted directly from the generator to the assembly output shaft 5 via the engaged clutch, and finally to the axle to drive the wheels.

[0029] The present invention features a coaxial longitudinal arrangement of two motors. The drive motor 2 is positioned between the generator 1 and the gearbox. Specifically, the drive motor shaft 203 is a hollow shaft, and the assembly output shaft 5 passes through it. One end of the output shaft 5 is inserted into and connected to the generator shaft 103, and the other end is connected to the axle. The engine is connected to the generator shaft 103, thereby transmitting power from the engine to the generator shaft 103, causing the generator 1 to generate electrical energy. This electrical energy drives the drive motor 2, which in turn drives the axle. The drive motor shaft 203 is connected to the gearbox transmission system for speed reduction and torque increase.

[0030] The clutch of this invention is located within the existing space formed between the windings of generator 1 and drive motor 2, without occupying additional axial space, thereby reducing the overall axial dimension of the system. Specifically, the winding of drive motor 2 protrudes axially towards generator 1, and the winding of generator 1 protrudes axially towards drive motor 2, thereby forming an accommodating space between the stator of drive motor 2 and the stator of generator 1, and the clutch is located within this accommodating space.

[0031] When the clutch is engaged, the generator shaft 103 is connected to the assembly output shaft 5, so that part of the engine's power is transmitted to the assembly output shaft 5 through the generator shaft 103. At the same time, after the engine's power is transmitted to the generator shaft 103, the generator 1 drives the drive motor 2 with electrical energy. Finally, the drive motor 2 is decelerated and torque-increased through the transmission system and output to the assembly output shaft 5, which then outputs to the axle to drive the wheels.

[0032] The two ends of the generator shaft 103 of the present invention are supported on the assembly housing by the first bearing 11, the two ends of the drive motor shaft 203 are supported on the assembly housing by the second bearing 12, and the assembly output shaft 5 is supported on the generator shaft 103 by the third bearing 13, on the drive motor shaft 203 by the fourth bearing 14, and on the housing by the fifth bearing 15, so as to adapt to the longitudinal hybrid system of P1+P3.

[0033] Furthermore, the housing includes a generator housing 7 with a built-in generator 1, a drive motor housing 8 with a built-in drive motor 2, and a gearbox housing 9. The assembly output shaft 5 is supported on the gearbox housing 9 by a fifth bearing. By making the radial dimensions of the generator 1 and the drive motor 2 the same, the radial dimensions of the generator housing 7 and the drive motor housing 8 are also the same, resulting in a high degree of external cleanliness of the system and reducing mold costs.

[0034] Of course, the radial dimensions of the generator housing 7 and the drive motor housing 8 can also be different, and can be adjusted according to the performance requirements of the generator 1 and the drive motor 2. However, no matter how it is adjusted, there will inevitably be a space between the generator 1 and the drive motor 2 due to the structure of the motor windings. This invention uses this space to house the clutch.

[0035] It should be noted that the generator housing 7, drive motor housing 8, and gearbox housing 9 here only represent the housing portion located outside the generator 1, the housing portion located outside the drive motor 2, and the housing portion located outside the transmission system of the gearbox, and do not limit their specific structures. For example, a preferred embodiment is shown in the appendix. Figure 3 The generator housing 7 also includes a front cover 6 facing the engine end. The drive motor housing 8 also houses the transmission system of the gearbox, while the gearbox housing 9 can be understood as a rear cover (also known as the gearbox cover).

[0036] The clutch of this invention is an electromagnetic clutch 10, specifically integrated on the generator shaft and the assembly output shaft. The right end of the generator shaft has a first toothed engagement tooth, and the left end of the assembly output shaft has a toothed disc with a second toothed engagement tooth that engages with the first toothed engagement tooth. An electromagnetic coil is mounted on the assembly output shaft, and the electromagnetic coil is mounted on the drive motor shaft via a coil support. When the electromagnetic coil is energized, it pushes the toothed disc closer to the first toothed engagement tooth until it engages with the first toothed engagement tooth, thereby connecting the generator shaft to the assembly output shaft.

[0037] For the transmission system of the gearbox, it can be a planetary gear train 3, see Appendix. Figure 1The sun gear 301 of the planetary gear train 3 is connected to the drive motor shaft 203, and the planet carrier 303 of the planetary gear train is connected to the assembly output shaft 5. The sun gear 301 meshes with the planet gears 302, and the planet carrier 303 also meshes with the planet gears 302 through the ring gear 304, thus coupling the sun gear 301 and the planet carrier 303 together. For this type of transmission system, the radial dimensions of the generator housing 7, the drive motor housing 8, and the gearbox housing can be set to be the same, thereby making the overall system appearance neat and reducing mold costs.

[0038] For the transmission system of the gearbox, it can also be a two-stage parallel gear system 4, see Appendix. Figure 2 The two-stage parallel gear system 4 includes a drive shaft 401, a large gear 402 and a small gear 403 mounted on the drive shaft 401. The large gear 402 meshes with the input shaft gear 404, thereby connecting to the drive motor shaft 203. The small gear 403 meshes with the main reduction gear 405, thereby connecting to the assembly output shaft 5. The drive shaft 401 is parallel to the assembly output shaft 5, and both ends are supported on the gearbox housing by the sixth bearing 16. Figure 3 In the preferred embodiment shown, one end of the drive shaft 401 is also supported on the drive motor housing 8.

[0039] In a preferred embodiment, the gearbox of the present invention has a reduction ratio of 3-4, the generator 1 and the engine adopt a direct-drive design (i.e., a speed ratio of 1), and the main reduction ratio of the axle is approximately 3.

[0040] See appendix Figure 3 The present invention also discloses an assembly method for a dual-motor coaxial longitudinal hybrid transmission, used for assembling the above-mentioned dual-motor coaxial longitudinal hybrid transmission system, comprising:

[0041] 1) Connect the generator rotor assembly 101 to the front cover 6;

[0042] 2) Next, assemble the stator assembly 102 of the generator with the rotor assembly 101 of the generator, and connect the generator housing 7 with the front cover 6.

[0043] 3) Assemble and connect the assembly output shaft 5 to the generator 1;

[0044] 4) Next, the rotor assembly 201 of the drive motor equipped with the electromagnetic clutch 10 is assembled onto the assembly output shaft 5.

[0045] 5) Assemble the stator assembly 202 of the drive motor with the rotor assembly 201 of the drive motor, and install the drive motor housing 8 so that the drive motor housing 8 is fixedly connected to the generator housing 7.

[0046] 6) Assemble the transmission system;

[0047] 7) Finally, install the gearbox housing 9 and fix the gearbox housing 9 to the drive motor housing 8 to complete the gearbox assembly.

[0048] The present invention also discloses a vehicle including the above-described dual-motor coaxial longitudinal hybrid powertrain system.

[0049] It should be noted that the embodiments of the present invention have better implementability and are not intended to limit the present invention in any way. Any person skilled in the art may use the above-disclosed technical content to change or modify it into equivalent effective embodiments. However, any modifications or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A dual-motor coaxial longitudinal hybrid power transmission system, characterized in that, It includes a drive motor, a generator, and a gearbox, wherein the drive motor is disposed between the generator and the gearbox; The drive motor shaft is a hollow shaft, and the assembly output shaft passes through the drive motor shaft. One end is inserted into the generator shaft and connected to the generator shaft, and the other end is connected to the axle. The engine is connected to the generator shaft, so that the power of the engine is transmitted to the generator shaft, so that the generator drives the drive motor through electrical energy, thereby driving the axle. The drive motor shaft is connected to the transmission system of the gearbox; a clutch is provided between the generator and the drive motor. When the clutch is engaged, the generator shaft is connected to the assembly output shaft, so that part of the engine's power is transmitted to the assembly output shaft through the generator shaft. At the same time, after part of the engine's power is transmitted to the generator shaft, the generator drives the drive motor with electrical energy, and the power of the drive motor is transmitted to the assembly output shaft through the transmission system. The winding of the drive motor protrudes axially toward the generator side, and the winding of the generator protrudes axially toward the drive motor side, thereby forming an accommodating space between the stator of the drive motor and the stator of the generator, and the clutch is disposed within the accommodating space; The two ends of the generator shaft are supported on the assembly housing by the first bearing, the two ends of the drive motor shaft are supported on the assembly housing by the second bearing, the assembly output shaft is supported on the generator shaft by the third bearing, on the drive motor shaft by the fourth bearing, and on the housing by the fifth bearing; The housing includes a generator housing that houses the generator, a drive motor housing that houses the drive motor, and a gearbox housing; The generator and the drive motor have the same radial dimension, so the generator housing and the drive motor housing have the same radial dimension. The assembly output shaft is supported on the gearbox housing by a fifth bearing; The transmission system is a planetary gear train. The sun gear of the planetary gear train is connected to the drive motor shaft, and the planet carrier of the planetary gear train is connected to the assembly output shaft. The sun gear and the planet carrier are respectively meshed with the planet gears, thereby coupling the sun gear and the planet carrier. The radial dimensions of the generator housing, the drive motor housing, and the gearbox housing are the same; The clutch is an electromagnetic clutch; The right end of the generator shaft is provided with a first toothed engagement tooth, and the left end of the assembly output shaft is provided with a toothed engagement disc, the toothed engagement disc being provided with a second toothed engagement tooth that engages with the first toothed engagement tooth; an electromagnetic coil is sleeved on the assembly output shaft, the electromagnetic coil being mounted on the drive motor shaft via a coil bracket. When the electromagnetic coil is energized, it pushes the toothed disc closer to the first toothed tooth until it engages with the first toothed tooth, thereby connecting the generator shaft to the assembly output shaft.

2. The dual-motor coaxial longitudinal hybrid power transmission system according to claim 1, characterized in that, The transmission system is a two-stage parallel gear system, which includes a drive shaft, a large gear and a small gear mounted on the drive shaft. The large gear meshes with the input shaft gear and is connected to the drive motor shaft, and the small gear meshes with the main reduction gear and is connected to the assembly output shaft. The drive shaft is parallel to the output shaft of the assembly.

3. The dual-motor coaxial longitudinal hybrid power transmission system according to claim 1, characterized in that, The reduction ratio of the transmission system is 3-4.

4. An assembly method for a dual-motor coaxial longitudinal hybrid transmission, characterized in that, For assembling the dual-motor coaxial longitudinal hybrid powertrain according to any one of claims 1-3, comprising: Connect the generator rotor assembly to the front cover; Next, the stator assembly of the generator is assembled with the rotor assembly of the generator, and the generator housing is connected to the front end cover; The assembly output shaft is connected to the generator. Next, the rotor assembly of the drive motor equipped with the clutch is assembled onto the output shaft of the assembly; Assemble the stator assembly of the drive motor with the rotor assembly of the drive motor, and install the drive motor housing so that the drive motor housing is fixedly connected to the generator housing; Assemble the transmission system; Finally, install the gearbox housing to fix it to the drive motor housing, thus completing the gearbox assembly.

5. A vehicle, characterized in that, The dual-motor coaxial longitudinal hybrid power transmission system as described in any one of claims 1-3 above.

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