Single-motor hybrid power transmission apparatus, transmission method and vehicle

Abstract

A single-motor hybrid power transmission apparatus, a transmission method, and a vehicle. The structure of the single-motor hybrid power transmission apparatus comprises: an engine (5); a motor (6); a brake component; a clutch component; a first planetary gear set (1) comprising a first sun gear (11), a first planet carrier (12), a first planet gear (13) and a first outer ring gear (14), wherein the first sun gear (11) is connected to the engine (5), the clutch component and the brake component, and the first planet carrier (12) is connected to the clutch component; and a second planetary gear set (2) coaxially arranged with the first planetary gear set (1), wherein the second planetary gear set (2) comprises a second sun gear (21), a second planet carrier (22), a second planet gear (23) and a second outer ring gear (24), the second planet carrier (22) is rigidly connected to the first outer ring gear (14), the second planet carrier (22) is connected to the motor (6), the second outer ring gear (24) is rigidly connected to the first planet carrier (12), and the second sun gear (21) is connected to the brake component. The single-motor hybrid power transmission apparatus, the transmission method, and the vehicle are capable of solving the problems of single hybrid mode, single gear and low space utilization rate of existing hybrid power transmission structures.

Description

Single-motor hybrid power transmission device, transmission method and vehicle

[0001] Cross-reference to related applications

[0002] The present application claims priority from the Chinese patent application No. 202410450446.8 filed on April 15, 2024, and entitled "Single-motor hybrid power transmission device, transmission method and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of vehicles, in particular to a single-motor hybrid power transmission device, a transmission method and a vehicle. BACKGROUND

[0004] Hybrid power vehicles are in a stage of vigorous development, and hybrid power vehicle driving devices occupy an extremely important position.

[0005] The current hybrid power transmission is limited by structure, has a single structure, and relies on the motor for speed and load capacity adjustment, which requires a high level of motor and is difficult to control the cost. The hybrid mode is single, the gear is single, the comprehensive fuel saving rate is low, and the comprehensive cost is high. The energy recovery mode is lacking, which is not conducive to energy recycling. The existing hybrid power driving system and hybrid electric vehicle usually adopt a multi-parallel shaft stacking arrangement, and each part is an independent device, which cannot be greatly improved in configuration and space utilization.

[0006] SUMMARY

[0007] Therefore, the purpose of the present application is to provide a single-motor hybrid power transmission device, a transmission method and a vehicle to solve the problems of single hybrid mode, single gear and low space utilization of the existing hybrid power transmission structure.

[0008] In order to achieve the above purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0009] The first aspect of the present application provides a single-motor hybrid power transmission device, wherein the single-motor hybrid power transmission device comprises: an engine; a motor; a brake component; a clutch component connected to an output shaft for driving a wheel; a first planetary gear set comprising a first sun gear, a first carrier, a first planet gear and a first ring gear, the first sun gear being connected to the engine, the first sun gear being connected to the clutch component, the first sun gear being connected to the brake component, the first carrier being connected to the clutch component; and a second planetary gear set coaxially arranged with the first planetary gear set, the second planetary gear set comprising a second sun gear, a second carrier, a second planet gear and a second ring gear, the second carrier being rigidly connected to the first ring gear, the second carrier being connected to the motor, the second ring gear being rigidly connected to the first carrier, the second sun gear being connected to the brake component.

[0010] Further, the brake component comprises a first brake and a second brake arranged independently of each other, the first brake being connected to the second sun gear, the second brake being connected to the first sun gear.

[0011] Further, the clutch component comprises a first clutch and a second clutch arranged in parallel with each other, the first clutch being connected to the first sun gear, the second clutch being connected to the first carrier.

[0012] Further, the single-motor hybrid power transmission device further comprises: a first intermediate shaft, a first end of the first intermediate shaft being connected to the first clutch, a second end of the first intermediate shaft being connected to the second brake, the first planetary gear set being arranged between the first clutch and the second brake, the first sun gear being connected to the first intermediate shaft; a second intermediate shaft, two ends of the second intermediate shaft being respectively connected to the first brake and the second sun gear; an input shaft, an input end of the input shaft being connected to the engine through a coupling, an output end of the input shaft being connected to the second end of the first intermediate shaft through a one-way clutch.

[0013] According to the second aspect of the present application, a transmission method of a single-motor hybrid power transmission device is provided, wherein the transmission method of the single-motor hybrid power transmission device comprises: realizing transmission of multiple gears by combining the first clutch and the second clutch or by combining one of the first clutch and the second clutch with one of the first brake and the second brake.

[0014] Further, the plurality of gears includes a first gear combining the second clutch and the second brake, a second gear combining the first clutch and the second clutch, a third gear combining the second clutch and the first brake, and a fourth gear combining the first clutch and the first brake.

[0015] Further, when the single-motor hybrid power transmission device is in the first gear, power of the motor is transmitted to the first outer ring gear through the second carrier, the second brake limits the movement of the first sun gear, the first outer ring gear drives the first planetary gear to rotate and drives the first carrier to rotate, so that power is transmitted to the second clutch through the first carrier, and finally transmitted to the output shaft to drive the wheels to rotate.

[0016] Further, when the single-motor hybrid power transmission device is in the second gear, power of the motor is transmitted to the first outer ring gear through the second carrier, and since the first clutch and the second clutch are combined, the first carrier and the first sun gear rotate at the same speed, and the first planetary gear set as a whole transmits power to the output shaft through the first clutch and the second clutch to drive the wheels to rotate.

[0017] Further, when the single-motor hybrid power transmission device is in the third gear, power of the motor is transmitted to the second carrier, the first brake limits the movement of the second sun gear, the second carrier drives the second planetary gear to rotate and drives the second outer ring gear to rotate, so that power is transmitted to the second clutch through the second outer ring gear, and finally transmitted to the output shaft to drive the wheels to rotate.

[0018] Further, when the single-motor hybrid power transmission device is in the fourth gear, power of the motor is transmitted to the second carrier, the first brake limits the movement of the second sun gear, the second carrier drives the second planetary gear to rotate and drives the second outer ring gear to rotate, and since the second carrier and the first outer ring gear are rigidly connected, the second outer ring gear and the first carrier are rigidly connected, so that power of the motor is transmitted to the first outer ring gear through the second carrier, the first carrier and the second outer ring gear rotate synchronously, and then the first planetary gear rotates and drives the first sun gear to rotate, so that power is transmitted to the first clutch through the first sun gear, and finally transmitted to the output shaft to drive the wheels to rotate.

[0019] Further, the transmission method of the single-motor hybrid power transmission device further comprises: when the single-motor hybrid power transmission device is in the first gear, the second gear, the third gear, the fourth gear or the parallel mode, the driver of the vehicle steps on the brake plate, the single-motor hybrid power transmission device opens the energy recovery mode, the motor changes from the driving mode to the power generation mode, the power source of the motor is cut off and the excitation is applied, and the kinetic energy of the vehicle is converted into the electric energy flowing to the power battery via the motor.

[0020] Further, the transmission method of the single-motor hybrid power transmission device further comprises: when the single-motor hybrid power transmission device is in the first gear, the second gear, the third gear, the fourth gear or the parallel mode, the driver of the vehicle steps on the brake plate, the single-motor hybrid power transmission device opens the energy recovery mode, the motor changes from the driving mode to the power generation mode, the power source of the motor is cut off and the excitation is applied, and the kinetic energy of the vehicle is converted into the electric energy flowing to the power battery via the motor.

[0021] Further, the transmission method of the single-motor hybrid power transmission device further comprises: when the vehicle is in the state of parking or stopping, the first brake is combined, the single-motor hybrid power transmission device is in the parking power generation mode, the motor is applied with the excitation, the power of the engine is transmitted to the first sun gear via the coupling, the input shaft and the first intermediate shaft, the power of the engine is branched via the first planetary carrier and the first outer ring gear of the first planetary gear set and is combined after being transmitted to the second planetary gear set, the second planetary carrier is rigidly connected with the first outer ring gear, the second outer ring gear is rigidly connected with the first planetary carrier, the first brake limits the movement of the second sun gear, so that the power of the engine drives the second planetary carrier to rotate, and finally drives the motor to rotate, so as to realize the parking power generation.

[0022] According to a third aspect of the present application, a vehicle is provided, wherein the vehicle comprises the single-motor hybrid power transmission device as described above.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] The single-motor hybrid power transmission device, transmission method and vehicle according to the present application have only one motor and one engine, and can realize various gears and various mode conditions through two planetary gears, the transmission relationship between the first planetary gear and the second planetary gear is established by rigidly connecting the first outer gear ring of the first planetary gear with the second carrier of the second planetary gear and rigidly connecting the second outer gear ring of the second planetary gear with the first carrier of the first planetary gear, and various transmission ratios are realized by selectively combining the brake component and the clutch component, the first planetary gear and the second planetary gear are arranged in a coaxial manner, so that the space and the configuration utilization rate can be provided, and thus the problems of single hybrid mode, single gear and low space utilization rate of the existing hybrid power transmission structure can be effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the specific embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Fig. 1 is a structural schematic view of a single-motor hybrid power transmission device according to the present application.

[0027] Fig. 2 is a power transmission path schematic view of the single-motor hybrid power transmission device according to the present application in a first gear.

[0028] Fig. 3 is a power transmission path schematic view of the single-motor hybrid power transmission device according to the present application in a second gear.

[0029] Fig. 4 is a power transmission path schematic view of the single-motor hybrid power transmission device according to the present application in a third gear.

[0030] Fig. 5 is a power transmission path schematic view of the single-motor hybrid power transmission device according to the present application in a fourth gear.

[0031] Fig. 6 is a power transmission path schematic view of the single-motor hybrid power transmission device according to the present application in a parallel mode in a second gear.

[0032] Fig. 7 is a power transmission path schematic view of the single-motor hybrid power transmission device according to the present application in a parallel mode in a fourth gear.

[0033] Fig. 8 is a power transmission path schematic view of the single-motor hybrid power transmission device according to the present application in a parking power generation mode.

[0034] Fig. 9 is a gear diagram of the single-motor hybrid power transmission device according to the present application.

[0035] Reference numerals: 1 - first planetary row; 11 - first sun gear; 12 - first planet carrier; 13 - first planet gear; 14 - first outer ring gear; 2 - second planetary row; 21 - second sun gear; 22 - second planet carrier; 23 - second planet gear; 24 - second outer ring gear; 31 - first brake; 32 - second brake; 41 - first clutch; 42 - second clutch; 5 - engine; 6 - electric motor; 71 - first intermediate shaft; 72 - second intermediate shaft; 8 - input shaft; 81 - coupling; 82 - one-way clutch; 9 - output shaft. DETAILED DESCRIPTION

[0036] The following detailed description is presented to aid the understanding of the method, apparatus and / or system described herein. Various changes, modifications, and equivalents thereof will become apparent to those skilled in the art once the disclosure is understood. For example, the order of the operations described herein is merely an example and the operations can be carried out in a different order than described herein, except where a particular order is essential, such as where a subsequent operation depends on the successful completion of a previous operation. Furthermore, features known to those in the art can be omitted for the sake of clarity and conciseness.

[0037] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the methods, apparatus and / or systems described herein to those skilled in the art. Further, the description should not be construed to mean that the described embodiments are the only ones that would accomplish the desired methods, apparatus and / or systems.

[0038] Throughout the specification, when an element (such as a layer, region or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "adjacent to" another element, or "covering" another element, it can be directly on, connected to, coupled to, adjacent to, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly adjacent to", or "directly covering" another element, there are no other elements interposed therebetween.

[0039] As used herein, the term "and / or" includes any and all combinations of one or more of the associated items.

[0040] Although terms such as "first" and "second" and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, terms of a first element, component, region, layer or section described herein could also be termed a second element, component, region, layer or section without departing from the teachings of the examples.

[0041] Spatially relative terms, such as "on", "upper", "lower", "above", and "below", can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Such spatially relative terms can be intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as being "on" or "above" other elements or features would then be oriented "below" or "under" the other elements or features. Thus, the term "on" can encompass both an "on" and "under" orientation depending on the spatial orientation of the device. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative terms used herein interpreted accordingly.

[0042] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of examples. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" and "contains", "containing" as used herein, are meant to be open-ended terms that specifically include, but are not limited to, the stated features, numbers, operations, components, elements, and / or combinations thereof.

[0043] Variations in shapes depicted in the drawings can occur as a consequence of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the precise shapes shown in the drawings, but include variations in shapes that would occur to one of ordinary skill in the art upon inspective of the drawings.

[0044] Features of the examples described herein can be combined with features of other examples in accordance with the disclosure in ways that would be apparent to those of ordinary skill in the art after inspective of the disclosure. Moreover, although examples have been described with various configurations, other configurations can also be possible.

[0045] As shown in FIG. 1, a single motor hybrid transmission according to a first aspect of the present application is provided, which includes an engine 5, a motor 6, a braking member, a clutch member, a first planetary gear set 1, and a second planetary gear set 2.

[0046] In the following description, the specific structure of the above components of the single-motor hybrid power transmission device and the connection relationship of the above components will be described in detail with reference to FIG. 1.

[0047] As shown in FIG. 1, in the embodiment, the single-motor hybrid power transmission device can include only one engine 5 and only one motor 6, and can achieve multi-mode and multi-gear driving in this way. Specifically, the first planetary gear set 1 can include a first sun gear 11, a first carrier 12, a first planet gear 13, and a first ring gear 14. The first sun gear 11 and the first carrier 12 can be connected with a clutch component. The clutch component can be connected with an output shaft 9 for driving the wheels of the vehicle to rotate. The first sun gear 11 can also be connected with an engine 5 for providing power to drive the first sun gear 11 to rotate. The first sun gear 11 can also be connected with a brake component for limiting the movement of the connected component. The second planetary gear set 2 can include a second sun gear 21, a second carrier 22, a second planet gear 23, and a second ring gear 24. The second sun gear 21 can be connected with a brake component. The second carrier 22 can be connected with a motor 6 (for example, through a spline connection) for providing power to drive the second carrier 22 to rotate. The second carrier 22 can also be rigidly connected with the first ring gear 14 (i.e., formed as one rigid whole or connected as one whole through fixed connection, such as welding), so that the rotational speed of the second carrier 22 and the first ring gear 14 remains consistent. The second ring gear 24 can be rigidly connected with the first carrier 12 (for example, welded), so that the rotational speed of the second ring gear 24 and the first carrier 12 remains consistent. Such a configuration can establish a transmission relationship between the first planetary gear set 1 and the second planetary gear set 2 to achieve various transmission ratios. In addition, by providing only two planetary gear sets (i.e., the first planetary gear set 1 and the second planetary gear set 2) and arranging the first planetary gear set 1 and the second planetary gear set 2 coaxially, the space utilization of the single-motor hybrid power transmission device can be greatly improved, and the stacking of multiple parallel shafts is avoided.

[0048] It should be noted that the operation of the planetary gear set requires locking one of the components or fixing the rotational speed of one of the components. The purpose of providing the brake component is to limit the movement of the components in the planetary gear set to ensure the normal operation of the planetary gear set. Further explanation: it is not necessary to ensure that one of the components in the first planetary gear set 1 or the second planetary gear set 2 is locked, but it is sufficient to fix the rotational speed of one of the components in the first planetary gear set 1 or the second planetary gear set 2, and to use the relative rotational movement of the remaining components relative to the component with fixed rotational speed to achieve the transmission principle of the planetary gear set.

[0049] Preferably, as shown in FIG. 1, in an embodiment, the braking component can include a first brake 31 and a second brake 32. The first brake 31 can be connected with the second sun gear 21, and the second brake 32 can be connected with the first sun gear 11. The first brake 31 and the second brake 32 are independent of each other (i.e., the first brake 31 and the second brake 32 are independently arranged), so that the single-motor hybrid power transmission device can selectively combine the first brake 31 and the second brake 32 to control the power transmission path.

[0050] Preferably, as shown in FIG. 1, in an embodiment, the clutching component can include a first clutch 41 and a second clutch 42. The first clutch 41 can be connected with the first sun gear 11, and the second clutch 42 can be connected with the first carrier 12. The first clutch 41 and the second clutch 42 are both connected to the output shaft 9 (i.e., the first clutch 41 and the second clutch 42 are arranged in parallel). The single-motor hybrid power transmission device can selectively combine the first clutch 41 and the second clutch 42 to control the power transmission path.

[0051] Further, preferably, as shown in FIG. 1, in an embodiment, the single-motor hybrid power transmission device can further include an input shaft 8, a first intermediate shaft 71, and a second intermediate shaft 72. The first end of the first intermediate shaft 71 (which can be the left end of the first intermediate shaft 71 as shown in FIG. 1) can be connected with the first clutch 41. The second end of the first intermediate shaft 71 (which can be the right end of the first intermediate shaft 71 as shown in FIG. 1) can be connected with the second brake 32. The first planetary set 1 can be arranged between the first clutch 41 and the second brake 32. Specifically, the first sun gear 11 of the first planetary set 1 can be connected with the first intermediate shaft 71 to achieve the connection of the first sun gear 11 with the first clutch 41 and the second brake 32. The input end of the input shaft 8 can be connected with the power system of the engine 5 through a coupler 81 (e.g., a spline connection). The output end of the input shaft 8 can be connected with the second end of the first intermediate shaft 71 through a one-way clutch 82. This enables the first sun gear 11 to be connected with the engine 5 through the first intermediate shaft 71. The two ends of the second intermediate shaft 72 can be respectively connected with the first brake 31 and the second sun gear 21 (i.e., the second sun gear 21 is connected with the first brake 31 through the second intermediate shaft 72). In this way, the single-motor hybrid power transmission device can selectively combine the braking component and the clutching component to control the power transmission path, achieve various transmission ratios, and further achieve multi-mode and multi-gear driving.

[0052] It should be further noted that the shafts and gears can be connected by keys. The clutch members and brake members can be connected by splines. This improves the stability of the connection, and in turn improves the stability and accuracy of power transmission.

[0053] Further, as shown in FIGS. 2 to 9, according to the second aspect of the present application, there is provided a transmission method of a single-motor hybrid power transmission device, which can be the single-motor hybrid power transmission device described above. The transmission method of the single-motor hybrid power transmission device includes engaging the first clutch 41 and the second clutch 42 or engaging one of the first clutch 41 and the second clutch 42 with one of the first brake 31 and the second brake 32, thereby achieving transmission of a plurality of gears.

[0054] Preferably, as shown in FIGS. 2 to 5 and 9, in an embodiment, the plurality of gears can include a first gear (EV1) in which the second clutch 42 and the second brake 32 are engaged, a second gear (EV2) in which the first clutch 41 and the second clutch 42 are engaged, a third gear (EV3) in which the second clutch 42 and the first brake 31 are engaged, and a fourth gear (EV4) in which the first clutch 41 and the first brake 31 are engaged.

[0055] Specifically, as shown in FIG. 2, in an embodiment, the second clutch 42 and the second brake 32 are engaged, and the single-motor hybrid power transmission device is in the first gear (EV1). In this case, the power of the motor 6 is transmitted to the second carrier 22. Since the second carrier 22 is rigidly connected to the first outer ring 14, the second carrier 22 has the same rotational speed as the first outer ring 14. That is, the power of the motor 6 is transmitted to the first outer ring 14 via the second carrier 22. And since the second brake 32 is engaged, the second brake 32 restricts the rotation of the first sun gear 11, so the rotational speed of the first sun gear 11 is 0. This allows the first outer ring 14 to drive the first planetary gear 13 in revolution, thereby rotating (i.e., revolving) the first carrier 12. The power of the motor 6 is transmitted to the second clutch 42 via the first carrier 12, and finally transmitted to the output shaft 9 to drive the wheels of the vehicle to rotate.

[0056] Preferably, as shown in FIG. 3, in an embodiment, the first clutch 41 and the second clutch 42 are engaged, and the single-motor hybrid power transmission device is in the second gear (EV2). In this case, the power of the motor 6 is transmitted to the second carrier 22. Since the second carrier 22 is rigidly connected to the first outer ring 14, the rotational speed of the second carrier 22 is the same as that of the first outer ring 14. That is, the power of the motor 6 is transmitted to the first outer ring 14 of the first planetary gear set 1 through the second carrier 22. Since the first clutch 41 and the second clutch 42 are engaged, the rotational speed of the first carrier 12 and the rotational speed of the first sun gear 11 are the same as that of the output shaft 9, and thus the rotational speed of the first carrier 12 and the rotational speed of the first sun gear 11 are the same. That is, after the power of the motor 6 is transmitted to the first planetary gear set 1, the first planetary gear set 1 as a whole transmits the power to the first clutch 41 and the second clutch 42 through the first carrier 12 and the first sun gear 11, and finally transmits the power to the output shaft 9 to drive the wheels of the vehicle to rotate. In this case, the rotational speed of the output shaft 9 (i.e., the output rotational speed) is the same as the rotational speed of the first outer ring 14 (i.e., the input rotational speed).

[0057] Preferably, as shown in FIG. 4, in an embodiment, the second clutch 42 and the first brake 31 are engaged, and the single-motor hybrid power transmission device is in the third gear (EV3). In this case, the power of the motor 6 is transmitted to the second carrier 22. Since the first brake 31 is engaged, the first brake 31 restricts the rotation of the second sun gear 21, and thus the rotational speed of the second sun gear 21 is 0. The second carrier 22 can drive the second planetary gear 23 to revolve, and thus drive the second outer ring 24 to rotate (i.e., to revolve). The power of the motor 6 is transmitted to the second clutch 42 through the second outer ring 24, and finally transmitted to the output shaft 9 to drive the wheels of the vehicle to rotate.

[0058] Preferably, as shown in FIG. 5, in an embodiment, the first clutch 41 and the first brake 31 are engaged, and the single-motor hybrid power transmission device is in the fourth gear (EV4). In this case, the power of the motor 6 is transmitted to the second carrier 22. Due to the engagement of the first brake 31, the first brake 31 restricts the rotation of the second sun gear 21, and the rotation speed of the second sun gear 21 is 0. This enables the second carrier 22 to drive the second planetary gear 23 to rotate (i.e., to rotate around its own axis), thereby driving the second outer ring gear 24 to rotate (i.e., to rotate around its own axis). Since the second outer ring gear 24 is rigidly connected to the first carrier 12, the first carrier 12 and the second outer ring gear 24 have the same rotation speed. Since the second carrier 22 is rigidly connected to the first outer ring gear 14, the second carrier 22 and the first outer ring gear 14 have the same rotation speed, i.e., the power of the motor 6 is transmitted to the first outer ring gear 14 via the second carrier 22. Therefore, in the case where the rotation speed of the first carrier 12 is a constant value, the first outer ring gear 14 can drive the first planetary gear 13 to rotate, and further drive the first sun gear 11 to rotate. The power of the motor 6 is transmitted to the first clutch 41 through the first sun gear 11, and finally transmitted to the output shaft 9 to drive the wheels of the vehicle to rotate.

[0059] More preferably, as shown in FIGS. 6 and 7, in an embodiment, the transmission method of the single-motor hybrid power transmission device further includes starting the engine 5 when the single-motor hybrid power transmission device is in the second gear or the fourth gear, so that the single-motor hybrid power transmission device is in a parallel mode, and both the motor 6 and the engine 5 can provide power. That is, when the vehicle is in the second gear or the fourth gear, the vehicle can make the engine 5 intervene in driving according to the power demand, so as to improve the power of the vehicle. After the engine 5 is started, the power of the engine 5 is sequentially transmitted to the first clutch 41 through the coupling 81, the input shaft 8, the one-way clutch 82, and the first intermediate shaft 71. In this case, the power of the engine 5 intervenes in the single-motor hybrid power transmission device, so that the engine 5 and the motor 6 jointly drive the wheels of the vehicle to rotate. The one-way clutch 82 is arranged to avoid the power of the motor 6 being transmitted to the engine 5, thereby avoiding the loss of electric energy and improving the service life of the engine 5.

[0060] Specifically, as shown in FIG. 6, in an embodiment, when the single-motor hybrid power transmission device is in the parallel mode of the second gear, the first clutch 41 and the second clutch 42 are engaged. The power of the engine 5 is transmitted to the first clutch 41 by the first intermediate shaft 71. The power transmission process of the motor 6 is similar to that in FIG. 3, which is not described herein again. Finally, the power of the engine 5 is transmitted to the output shaft 9 via the first clutch 41, and the power of the motor 6 is jointly transmitted to the output shaft 9 via the first clutch 41 and the second clutch 42.

[0061] As shown in FIG. 7, in an embodiment, when the single-motor hybrid power transmission device is in the fourth gear in the parallel mode, the first clutch 41 is engaged, and the power of the engine 5 is transmitted to the first clutch 41 through the first intermediate shaft 71. The power transmission process of the motor 6 is similar to that in FIG. 5, which will not be described herein again. Finally, the power of the engine 5 and the power of the motor 6 are transmitted to the output shaft 9 through the first clutch 41.

[0062] In addition, preferably, in an embodiment, the transmission method of the single-motor hybrid power transmission device further comprises that when the single-motor hybrid power transmission device is in the first gear, the second gear, the third gear, the fourth gear or the parallel mode, the driver steps on the brake plate to make the single-motor hybrid power transmission device start the energy recovery mode. In the first gear, the second gear, the third gear, the fourth gear and the parallel mode, the flow of energy is converted from the electric energy of the power battery to the kinetic energy through the motor, and finally drives the vehicle. In the energy recovery mode, the vehicle detects the braking intention of the driver, cuts off the power source of the motor 6, and controls the motor 6 to apply excitation to the motor 6 through the controller, so that the motor 6 changes from the driving mode to the generating mode, i.e. the motor 6 is converted into a generator to generate electricity (in the process of generating electricity, the motor 6 can be regarded as a load or a resistance device to brake the vehicle). The kinetic energy of the vehicle can be converted into electric energy to flow to the power battery to realize energy recovery and avoid waste of energy after braking. In this process, the combination state of the clutch components and the brake components of the single-motor hybrid power transmission device does not change, i.e. the same as the combination state of the driving mode at the moment before braking.

[0063] Preferably, as shown in FIG. 8, in an embodiment, the transmission method of the single-motor hybrid power transmission device further comprises, when the vehicle is in a parking or standing state, engaging the first brake 31, so that the single-motor hybrid power transmission device is in a parking power generation mode. In this case, the motor 6 is in a power generation mode (i.e. the motor 6 is excited). The power of the engine 5 is sequentially transmitted to the first sun gear 11 through the coupling 81, the input shaft 8, the one-way clutch 82 and the first intermediate shaft 71. The power of the engine 5 is power-split through the first planetary carrier 12 and the first ring gear 14 of the first planetary gear set 1, and is power- combined after being transmitted to the second planetary gear set 2. That is, since the second planetary carrier 22 is rigidly connected to the first ring gear 14, and the second ring gear 24 is rigidly connected to the first planetary carrier 12. Therefore, a first part of the power transmitted to the first sun gear 11 is transmitted to the second ring gear 24 of the second planetary gear set 2 by the first planetary carrier 12, and a second part of the power is transmitted to the second planetary carrier 22 of the second planetary gear set 2 by the first ring gear 14. Since the first brake 31 limits the movement of the second sun gear 21, the rotational speed of the second sun gear 21 is 0. Therefore, the first part of the power can be transmitted to the second planetary carrier 22 by the second ring gear 24, and the first part of the power and the second part of the power jointly drive the second planetary carrier 22 to rotate, and finally drive the motor 6 to rotate, so as to realize parking power generation.

[0064] As shown in FIG. 9, in an embodiment, the transmission method of the single-motor hybrid power transmission device can realize four-gear transmission of the motor 6 and power provided by the motor 6 and the engine 5 jointly, i.e. first-gear (EV1) transmission, second-gear (EV2) transmission, third-gear (EV3) transmission, fourth-gear (EV4) transmission and parallel mode. Among them, the rotational speed of the wheels in the first gear, the second gear, the third gear and the fourth gear is improved in turn. The transmission method of the single-motor hybrid power transmission device can also realize parking power generation (i.e. parking power generation mode) and brake energy recovery (i.e. energy recovery mode). So that the single-motor hybrid power transmission device can realize various hybrid modes and multi-gear power output, so as to meet the actual working conditions and actual needs, and is conducive to reducing energy consumption.

[0065] In addition, according to the third aspect of the present application, a vehicle is provided, which comprises the single-motor hybrid power transmission device as described above.

[0066] In use, the vehicle establishes a transmission relationship between the first planetary row 1 and the second planetary row 2 by rigidly connecting the first outer ring gear 14 of the first planetary row 1 with the second carrier 22 of the second planetary row 2 and rigidly connecting the second outer ring gear 24 of the second planetary row 2 with the first carrier 12 of the first planetary row 1, and realizes a transmission form of multiple transmission ratios. The first planetary row 1 and the second planetary row 2 are coaxially arranged, so that the space utilization of the single-motor hybrid power transmission device can be improved. The vehicle controls the power transmission path in the single-motor hybrid power transmission device by selectively combining the first brake 31, the second brake 32, the first clutch 41 and the second clutch 42, thereby realizing multi-mode and multi-gear driving, and achieving the functions of energy recovery during travel and power generation during parking.

[0067] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present application, and are used to illustrate the technical solutions of the present application, but not to limit the same. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can make modifications or easily think of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed by the present application, or make equivalent replacements to some of the technical features; and these modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims. Industrial applicability

[0068] The single-motor hybrid power transmission device, transmission method and vehicle provided by the present application have only one motor and one engine, and can realize multiple gears and multiple mode working conditions through transmission by two planetary rows. The first outer ring gear of the first planetary row is rigidly connected with the second carrier of the second planetary row, and the second outer ring gear of the second planetary row is rigidly connected with the first carrier of the first planetary row, to establish a transmission relationship between the first planetary row and the second planetary row, and multiple transmission ratios are realized by selectively combining brake components and clutch components. The first planetary row and the second planetary row are arranged in a coaxial manner, so that space and configuration utilization can be provided.

Claims

1. A single-motor hybrid power transmission device installed in a vehicle, characterized by comprising: The single-motor hybrid power transmission device comprises: an engine; a motor; a braking component; a clutching component connected to an output shaft for driving a wheel; a first planetary gear set comprising a first sun gear, a first carrier, a first planet gear and a first ring gear, the first sun gear being connected to the engine, the first sun gear being connected to the clutching component, the first sun gear being connected to the braking component, the first carrier being connected to the clutching component; and a second planetary gear set coaxially arranged with the first planetary gear set, the second planetary gear set comprising a second sun gear, a second carrier, a second planet gear and a second ring gear, the second carrier being rigidly connected to the first ring gear, the second carrier being connected to the motor, the second ring gear being rigidly connected to the first carrier, the second sun gear being connected to the braking component.

2. The single-motor hybrid power transmission device according to claim 1, characterized by, The braking component comprises a first brake and a second brake arranged independently of each other, the first brake being connected to the second sun gear, the second brake being connected to the first sun gear.

3. The single-motor hybrid power transmission device according to claim 2, characterized by, The clutching component comprises a first clutch and a second clutch arranged in parallel with each other, the first clutch being connected to the first sun gear, the second clutch being connected to the first carrier.

4. The single-motor hybrid power transmission device according to claim 3, characterized by The single-motor hybrid power transmission device further comprises: a first intermediate shaft, a first end of the first intermediate shaft being connected to the first clutch, a second end of the first intermediate shaft being connected to the second brake, the first planetary gear set being arranged between the first clutch and the second brake, the first sun gear being connected to the first intermediate shaft; a second intermediate shaft, two ends of the second intermediate shaft being connected to the first brake and the second sun gear respectively; an input shaft, an input end of the input shaft being connected to the engine through a coupling, an output end of the input shaft being connected to the second end of the first intermediate shaft through a one-way clutch. The single-motor hybrid power transmission device is the single-motor hybrid power transmission device of claim 4, and a transmission method of the single-motor hybrid power transmission device comprises: realizing transmission of multiple gears by combining the first clutch and the second clutch or by combining one of the first clutch and the second clutch with one of the first brake and the second brake.

5. A drive method of a single-motor hybrid power transmission device, characterized by, The multiple gears comprise a first gear combined by the second clutch and the second brake, a second gear combined by the first clutch and the second clutch, a third gear combined by the second clutch and the first brake, and a fourth gear combined by the first clutch and the first brake.

6. The single-motor hybrid power transmission apparatus drive method according to claim 5, characterized by, When the single-motor hybrid power transmission device is in the first gear, power of the motor is transmitted to the first ring gear through the second carrier, the second brake restricts movement of the first sun gear, the first ring gear drives the first planet gear to rotate and drives the first carrier to rotate, power is transmitted to the second clutch through the first carrier, and finally transmitted to the output shaft to drive the wheel to rotate.

7. The single-motor hybrid transmission method according to claim 6, characterized by, ​ 8. The single-motor hybrid power transmission method according to claim 6, characterized by, When the single-motor hybrid power transmission device is in the second gear, the power of the motor is transmitted to the first outer ring gear through the second carrier, and the first carrier and the first sun gear rotate at the same speed due to the engagement of the first clutch and the second clutch. The first planetary gear set as a whole transmits the power to the output shaft through the first clutch and the second clutch to drive the wheels to rotate.

9. The single-motor hybrid power transmission apparatus drive method according to claim 6, characterized by, When the single-motor hybrid power transmission device is in the third gear, the power of the motor is transmitted to the second carrier, and the second carrier drives the second planetary gear to rotate and drives the second outer ring gear to rotate, so that the power is transmitted to the second clutch through the second outer ring gear, and finally transmitted to the output shaft to drive the wheels to rotate.

10. The single-motor hybrid power transmission method according to claim 6, characterized by, When the single-motor hybrid power transmission device is in the fourth gear, the power of the motor is transmitted to the second carrier, and the second carrier drives the second planetary gear to rotate and drives the second outer ring gear to rotate. Since the second carrier and the first outer ring gear are rigidly connected, the second outer ring gear and the first carrier are rigidly connected, so that the power of the motor is transmitted to the first outer ring gear through the second carrier, the first carrier and the second outer ring gear rotate synchronously, and then the first planetary gear rotates and drives the first sun gear to rotate, so that the power is transmitted to the first clutch through the first sun gear, and finally transmitted to the output shaft to drive the wheels to rotate.

11. The drive method of the single-motor hybrid transmission according to any one of claims 6 to 10, characterized by, The transmission method of the single-motor hybrid power transmission device comprises: When the single-motor hybrid power transmission device is in the second gear or the fourth gear, the engine is started, so that the single-motor hybrid power transmission device is in parallel mode, and the power of the engine is transmitted to the first clutch through the coupling, the input shaft, the one-way clutch and the first intermediate shaft.

12. The single-motor hybrid power transmission apparatus drive method according to claim 11, characterized by, The transmission method of the single-motor hybrid power transmission device further comprises: When the single-motor hybrid power transmission device is in the first gear, the second gear, the third gear, the fourth gear or the parallel mode, the driver of the vehicle steps on the brake plate, so that the single-motor hybrid power transmission device starts the energy recovery mode, the motor changes from the driving mode to the generating mode, the power source of the motor is cut off and the excitation is applied, and the kinetic energy of the vehicle is converted into electric energy through the motor and flows to the power battery. The transmission method of the single-motor hybrid power transmission device further comprises:

13. The drive method of the single-motor hybrid transmission according to any one of claims 6 to 10, characterized by, ​ In the state that the vehicle is parked or stopped, the first brake is engaged, the single-motor hybrid power transmission device is in the parked power generation mode, the motor is applied with excitation, the power of the engine is transmitted to the first sun gear through the coupling, the input shaft and the first intermediate shaft, the power of the engine is split through the first planetary carrier and the first outer ring, and is combined after being transmitted to the second planetary gear set, since the second planetary carrier is rigidly connected with the first outer ring and the first planetary carrier is rigidly connected with the second outer ring, the first brake limits the movement of the second sun gear, so that the power of the engine drives the second planetary carrier to rotate, and finally drives the motor to rotate, to realize parked power generation.

14. A vehicle characterized by comprising: The vehicle comprises the single-motor hybrid power transmission device according to any one of claims 1 to 4.

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