Coaxial transmission device, power system and vehicle

Abstract

The invention relates to the technical field of planetary gear set transmission, and discloses a coaxial transmission device, a power system and a vehicle, the coaxial transmission device comprises a shell assembly, a planet carrier assembly, a sun wheel assembly, a planet wheel assembly and a differential mechanism assembly, and an inner gear ring part is arranged in the shell assembly; the planet carrier assembly is rotationally arranged in the shell assembly around the axis of the planet carrier assembly, and a driving cavity and an output cavity are formed in the planet carrier assembly in the axial direction of the planet carrier assembly. The sun gear assembly is rotationally arranged in the driving cavity around the axis of the sun gear assembly and is in transmission connection with a rotating shaft of the rotating driving device; the multiple planet wheel assemblies are evenly distributed in the circumferential direction of the planet carrier assembly, and the two ends of a rotating shaft of each planet wheel assembly are connected with the planet carrier assembly. The differential assembly is rotationally arranged in the output cavity around the output axis of the differential assembly, and a planetary gear component of the differential assembly is fixedly connected with the planetary carrier assembly; the problems that a coaxial transmission device is poor in dynamic balance performance and poor in NVH performance can be solved.

Description

Technical Field

[0001] The present application relates to the field of planetary gear set transmission technology, and in particular to a coaxial transmission device, a power system and a vehicle. Background Art

[0002] With the further tightening of carbon emission requirements and the increasing market demand for pure electric new energy vehicles, various automakers are seeking electric drive assemblies with better performance and layout for the development of new energy vehicle models. At present, electric drive powertrains are divided into two categories: parallel axis and coaxial. Coaxial has the advantages of friendly layout size and good compatibility with other vehicle components such as steering gear. In particular, the planetary coaxial also has the characteristics of high power density and high transmission efficiency.

[0003] In the related art, in a star-row coaxial transmission device, a driving device directly drives multiple planetary wheels synchronously through a driving wheel to rotate a compound planetary carrier, and the compound planetary carrier then drives a differential to achieve power output. However, when the driving device is transmitted through a driving wheel and a planetary wheel, since the driving wheel is installed on the end of the output shaft of the driving device, the end of the output shaft of the driving device has no supporting structure, resulting in a single-branch structure, which causes the coaxial transmission device to have poor dynamic balance performance and poor NVH performance. Summary of the invention

[0004] In view of this, the present application provides a coaxial transmission device, a power system and a vehicle to solve the problems of poor dynamic balance performance and poor NVH performance of the coaxial transmission device.

[0005] In the first aspect, the present application provides a coaxial transmission device, including a housing assembly, a planetary carrier assembly, a sun gear assembly, a planetary gear assembly and a differential assembly, wherein an inner gear ring component is arranged in the housing assembly; the planetary carrier assembly is rotatably arranged in the housing assembly around its axis, and the planetary carrier assembly is provided with a driving chamber and an output chamber along its axial direction; the sun gear assembly is rotatably arranged in the driving chamber around its axis, and the axis of the sun gear assembly coincides with the axis of the planetary carrier assembly, and the sun gear assembly is used for transmission connection with a rotating shaft of a rotating drive device; a plurality of planetary gear assemblies are arranged and are evenly distributed along the circumference of the planetary carrier assembly, the planetary gear assemblies are meshed with the sun gear assembly and the inner gear ring component, and both ends of the rotating shaft of the planetary gear assembly are connected to the planetary carrier assembly; the differential assembly is rotatably arranged in the output chamber around its output axis, and the output axis of the differential assembly coincides with the axis of the planetary carrier assembly, and the planetary gear component of the differential assembly is fixedly connected to the planetary carrier assembly.

[0006] Beneficial effect: By setting the sun gear assembly in the driving cavity on the planetary carrier assembly, both ends of the rotating shaft of the planetary gear assembly can be rotatably connected to the planetary gear assembly, and the planetary gear assemblies are arranged in multiple numbers and are evenly distributed along the circumference of the planetary carrier assembly, so that during the transmission process between the planetary gear assembly and the sun gear assembly, the planetary gear assembly can be prevented from forming a single-branch structure, and the planetary gear assembly can be prevented from being deformed due to the transmitted torque during the transmission process with the sun gear assembly, thereby affecting the dynamic balance performance of the coaxial transmission device, avoiding the generation of vibration noise, and improving the NVH performance.

[0007] In an optional embodiment, the planetary gear assembly includes the rotating shaft, a first gear and a second gear, the first gear and the second gear are arranged on the rotating shaft for synchronous rotation, the first gear is meshed with the sun gear assembly, and the second gear is meshed with the inner ring gear component.

[0008] Beneficial effect: The first gear and the second gear are rotatably arranged on the rotating shaft on the planetary gear assembly, and the first gear is meshed with the sun gear assembly, and the second gear is meshed with the inner ring gear assembly. It can be used to adjust the speed ratio of the planetary gear assembly and the inner ring gear component, thereby achieving the effect of adjusting the transmission ratio.

[0009] In an optional embodiment, the number of the planetary gear components in the differential assembly is the same as the number of the planetary wheel assemblies.

[0010] Beneficial effect: Since the number of planetary gear components in the differential assembly is the same as the number of planetary wheel assemblies, the distribution uniformity of the driving torque of the planetary wheel assembly to the planetary carrier assembly can be improved, thereby increasing the service life of each mating component, and improving the stability of the dynamic balance performance of each component during the transmission process, further reducing the generation of transmission vibration and noise, and improving NVH performance.

[0011] In an optional embodiment, a plurality of the second gears and a plurality of the planetary gear components are alternately arranged in sequence along the circumferential direction of the planetary carrier assembly, and an orbital inner diameter of the second gear is smaller than an outer diameter of the output cavity.

[0012] Beneficial effect: By alternately arranging the second gear and the planetary gear component along the circumference of the planetary carrier assembly, and the orbital inner diameter of the second gear being smaller than the orbital outer diameter of the planetary gear component, the radial dimension of the housing assembly can be effectively reduced, the space required for its arrangement can be reduced, and the adaptability of its arrangement can be improved.

[0013] In an optional embodiment, both ends of the planet carrier assembly along its axial direction are rotatably connected to the housing assembly.

[0014] Beneficial effect: By rotatably connecting both ends of the planetary carrier assembly to the housing assembly, the stability of the planetary carrier assembly's rotation can be improved, thereby improving its dynamic balance performance, reducing vibration and noise, and improving NVH performance.

[0015] In an optional embodiment, an input through-hole and a first output through-hole are sequentially arranged on the driving cavity along the axis of the sun gear assembly and close to the output cavity, the input through-hole is used for the rotating shaft of the rotating driving device to pass through and be transmission-connected with the sun gear assembly, and a second output through-hole is arranged on the output cavity away from the driving cavity along the axis of the sun gear assembly, and the first output through-hole and the second output through-hole are respectively used for the output shafts on both sides of the differential assembly to pass through.

[0016] Beneficial effects: By setting the input through hole, the sun gear assembly can be easily connected to the rotating shaft of the rotating drive device for transmission, and by setting the first output through hole and the second output through hole, the differential assembly can be easily connected to the output shafts on both sides thereof.

[0017] In an optional implementation, the outer diameter of the sun gear assembly is smaller than the diameter of the input through hole.

[0018] Beneficial effect: The outer diameter of the sun gear assembly is smaller than the diameter of the input through hole, which can facilitate the installation of the sun gear assembly into the driving cavity.

[0019] In an optional embodiment, one end of the sun gear assembly is rotationally connected to the input via; and / or, the other end of the sun gear assembly is rotationally connected to the first output via; and / or, the half-shaft gear in the differential assembly close to the first output via is rotationally connected to the first output via; and / or, the half-shaft gear in the differential assembly close to the second output via is rotationally connected to the second output via.

[0020] Beneficial effect: By respectively connecting the two ends of the sun gear assembly to the input via and the first output via for rotation, the rotational dynamic balance performance of the sun gear assembly can be improved, the rotational vibration and the noise generated thereby can be reduced, and the NVH performance can be improved.

[0021] In a second aspect, the present application further provides a power system, comprising a rotary drive device and a coaxial transmission device as in any one of the embodiments of the first aspect, wherein the rotary shaft of the rotary drive device is coaxially connected to the sun gear assembly.

[0022] Beneficial effect: Because the power system includes a coaxial transmission device, it has the same effect as the coaxial transmission device and will not be described in detail here.

[0023] In a third aspect, the present application further provides a vehicle, comprising a coaxial transmission device as in any one of the embodiments in the first aspect; and / or, a power system as in the second aspect.

[0024] Beneficial effect: Because the vehicle includes a coaxial transmission device, it has the same effect as the coaxial transmission device and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a schematic diagram of a star-row coaxial transmission device in the related art;

[0027] Figure 2 This is a schematic diagram of the shaft side of a coaxial transmission device according to an embodiment of the present application;

[0028] Figure 3 It is a left side view of a coaxial transmission device according to an embodiment of the present application;

[0029] Figure 4 for Figure 3 Rotated section view at AA in the middle;

[0030] Figure 5 A schematic diagram of a coaxial transmission device according to an embodiment of the present application;

[0031] Figure 6 A schematic diagram of a housing assembly in a coaxial transmission device according to an embodiment of the present application;

[0032] Figure 7 This is a schematic structural diagram of a planet carrier assembly in a coaxial transmission device according to an embodiment of the present application;

[0033] Figure 8 A cross-sectional view of the cooperation between the second gear and the differential assembly in a coaxial transmission device according to an embodiment of the present application;

[0034] Fig. 9 It is a schematic diagram of the matching structure of a planet carrier assembly, a planetary gear assembly and a differential assembly in a coaxial transmission device according to an embodiment of the present application;

[0035] Fig.10 for Fig. 9 Schematic diagram of the planet carrier assembly removed;

[0036] Fig.11This is a schematic diagram of the matching structure of a planet carrier assembly and a differential assembly in a coaxial transmission device according to an embodiment of the present application;

[0037] Fig.12 for Fig.11 Schematic diagram;

[0038] Fig.13 This is a schematic structural diagram of a planetary gear assembly in a coaxial transmission device according to an embodiment of the present application;

[0039] Fig.14 It is a schematic diagram of the exploded structure of a differential assembly in a coaxial transmission device according to an embodiment of the present application.

[0040] Description of reference numerals:

[0041] 1. Housing assembly; 2. Planet carrier assembly; 3. Sun gear assembly; 4. Planet gear assembly; 5. Differential assembly; 6. Rotary drive device;

[0042] 101. Internal gear ring component;

[0043] 201, driving chamber; 202, output chamber;

[0044] 2011, input via hole; 2012, first output via hole; 2013, avoidance hole; 2021, second output via hole; 2022, avoidance part;

[0045] 401, rotating shaft; 402, first gear; 403, second gear;

[0046] 501, planetary gear component; 502, side shaft gear;

[0047] 601, rotating shaft;

[0048] 7. Planetary gear; 8. Sun gear; 9. Composite planetary carrier. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0050] In the relevant technology, electric drive powertrain is generally divided into two categories: parallel axis and coaxial. Coaxial has the advantages of friendly layout dimensions and good compatibility with other vehicle components such as steering gear. In particular, the coaxial planetary gear also has the characteristics of high power density and high transmission efficiency.

[0051] In the star-coaxial transmission device, the driving device directly drives multiple planetary wheels synchronously through the driving wheel to rotate the composite planetary carrier, and the composite planetary carrier then drives the differential to achieve power output. However, when the driving device is transmitted through the driving wheel and the planetary wheel, since the driving wheel is installed on the end of the output shaft of the driving device, the end of the output shaft of the driving device has no supporting structure, forming a single-branch structure. Figure 1 As shown in Figure 1 The structure in the middle dotted box is a single-branch structure, that is, the rotating connection structure between the planetary gear 7 and the composite planetary carrier 9 is located on one side of the planetary gear 7, and cannot support both sides of the planetary gear shaft at the same time. Therefore, when the sun gear 8 applies a driving load to the planetary gear 7, the planetary gear 7 will deform relative to its shaft, resulting in poor dynamic balance performance of the coaxial transmission device and poor NVH performance.

[0052] In order to solve the above technical problems, the present application provides a coaxial transmission device, a power system and a vehicle to solve the problems of poor dynamic balance performance and poor NVH performance of the coaxial transmission device.

[0053] Combine the following Figures 2 to 14 , describing an embodiment of the present application.

[0054] According to an embodiment of the present application, on the one hand, a coaxial transmission device is provided, such as Figures 2 to 7 As shown, it includes a housing assembly 1, a planet carrier assembly 2, a sun gear assembly 3, a planetary gear assembly 4 and a differential assembly 5, as shown in FIG. Figures 4 to 6 As shown, the housing assembly 1 is provided with an inner gear ring component 101. Specifically, the inner gear ring component 101 can be an integrally formed structure with the housing assembly 1. The planet carrier assembly 2 is rotatably arranged in the housing assembly 1 around its axis. Figure 7 As shown, the planet carrier assembly 2 is provided with a driving cavity 201 and an output cavity 202 along its axial direction; Figures 4 to 5 As shown, the sun gear assembly 3 is rotatably arranged in the driving chamber 201 around its axis, and the axis of the sun gear assembly 3 coincides with the axis of the planetary carrier assembly 2. The sun gear assembly 3 is used for transmission connection with the rotating shaft 601 of the rotating driving device 6; Figures 9 and 10 As shown, a plurality of planetary gear assemblies 4 are provided and are evenly distributed along the circumference of the planetary carrier assembly 2. The planetary gear assemblies 4 are meshed with the sun gear assembly 3 and the inner ring gear component 101. Both ends of the rotating shaft 401 of the planetary gear assembly 4 are connected to the planetary carrier assembly 2. Preferably, the number of the planetary gear assemblies 4 is 2 to 4, and more preferably 3; Figure 11 to Figure 12 As shown, the differential assembly 5 is rotatably arranged around its output axis in the output cavity 202 , and the output axis of the differential assembly 5 coincides with the axis of the planet carrier assembly 2 , and the planetary gear component 501 of the differential assembly 5 is fixedly connected to the planet carrier assembly 2 .

[0055] Specifically, Figure 4 and Figure 5 As shown, scheme one: the two ends of the rotating shaft 401 of the planetary gear assembly 4 are 401a and 401b respectively, both of which are fixedly connected to the planetary carrier assembly 2 through fixing parts (such as limit rings, end covers, etc.), and the gear in the planetary gear assembly 4 for meshing with the sun gear assembly 3 and the inner ring gear component 101 is rotatably connected to the rotating shaft 401; scheme two: the two ends of the rotating shaft 401 of the planetary gear assembly 4 are 401a and 401b respectively, both of which are rotatably connected to the planetary carrier assembly 2 through bearings or bearing shells, and the gear in the planetary gear assembly 4 for meshing with the sun gear assembly 3 and the inner ring gear component 101 is fixedly connected or rotatably connected to the rotating shaft 401.

[0056] It should be noted that if Figure 7 As shown, the sun gear assembly 3 is arranged in the driving cavity 201 on the planetary carrier assembly 2, and the planetary gear assembly 4 is meshed with the sun gear assembly 3. By opening an avoidance hole 2013 on the driving cavity 201 and spaced to match the planetary gear assembly 4, the planetary gear assembly 4 can be deeply inserted into the driving cavity 201 to mesh with the sun gear assembly 3 for transmission.

[0057] In some embodiments not shown, Figure 4 As shown, the connection method between the inner ring gear component 101 and the shell assembly 1 can also be that an outer ring gear is arranged on the outer circumferential surface of the inner ring gear component 101, and an inner ring gear is arranged on the shell assembly 1, and a circumferential connection is achieved through the cooperation between the outer ring gear and the inner ring gear, so as to form a floating structure to achieve load balance and improve the bearing capacity of the gear, and also to achieve vibration isolation to reduce the operating noise; one side of the inner ring gear component 101 can be limited by a limiting ring, and the other side can be elastically clamped on the shell assembly 1 by a limiting plate to limit the inner ring gear component 101.

[0058] In this embodiment, if Figures 2 to 7 As shown, during the driving process of the sun gear assembly 3 on the planetary gear assembly, since the sun gear assembly 3 is arranged in the driving cavity 201 on the planetary carrier assembly 2, both ends of the rotating shaft 401 of the planetary gear assembly 4 can be rotatably connected to the planetary gear assembly 4, and the planetary gear assembly 4 is arranged in multiple numbers and is evenly distributed along the circumference of the planetary carrier assembly 2, which can avoid the planetary gear assembly 4 from forming a single structure and avoid the planetary gear assembly 4 from being deformed due to the transmitted torque during the transmission process with the sun gear assembly 3, thereby affecting the dynamic balance performance of the coaxial transmission device, avoiding the generation of vibration noise, and improving the NVH performance.

[0059] In an optional embodiment, if Fig.13As shown, the planetary gear assembly 4 includes a rotating shaft 401 , a first gear 402 and a second gear 403 . The first gear 402 and the second gear 403 are synchronously rotated and arranged on the rotating shaft 401 . The first gear 402 is meshed with the sun gear assembly 3 , and the second gear 403 is meshed with the inner gear ring component 101 .

[0060] It should be noted that the outer diameter of the first gear 402 and the outer diameter of the second gear 403 can be different to adjust the speed ratio of the planetary gear assembly and the inner ring gear component 101, thereby achieving the effect of adjusting the transmission ratio; of course, the outer diameter of the first gear 402 and the outer diameter of the second gear 403 can also be the same; preferably, the outer diameter of the second gear 403 is smaller than the outer diameter of the first gear 402, so that when the second gear 403 is meshed with the inner ring gear component 101, the radial dimension of the housing assembly 1 can be reduced.

[0061] It is worth noting that the size setting of the outer diameter of the first gear 402 and the outer diameter of the second gear 403, as well as the ratio setting, can be selected and adjusted according to actual conditions; the first gear 402 and the second gear 403 are synchronously rotated on the rotating shaft 401, which means that the first gear 402 and the second gear 403 rotate at the same angular velocity, and also means that the first gear 402 and the second gear 403 are fixedly connected along the axial direction of the rotating shaft 401, that is, the first gear 402 and the second gear 403 are an integrated structure.

[0062] In an optional embodiment, if Figure 8 As shown, the number of the planetary gear components 501 in the differential assembly 5 is the same as the number of the planetary gear assemblies 4 .

[0063] In this embodiment, since the number of planetary gear components 501 in the differential assembly 5 is the same as the number of planetary wheel assemblies 4, the distribution uniformity of the driving torque of the planetary wheel assembly 4 on the planetary carrier assembly 2 can be improved, thereby increasing the service life of each mating component, and improving the stability of the dynamic balance performance of each component during the transmission process, further reducing the generation of transmission vibration noise, and improving NVH performance.

[0064] In an optional embodiment, if Figure 8 As shown, the plurality of second gears 403 and the plurality of planetary gear components 501 are alternately arranged in sequence along the circumferential direction of the planetary carrier assembly 2 , and the orbital inner diameter of the second gear 403 is smaller than the outer diameter of the output cavity 202 .

[0065] Preferably, the number of the planetary gear assemblies 4 is 2 to 4, more preferably 3.

[0066] It is worth noting that the plurality of second gears 403 and the plurality of planetary gear components 501 are alternately arranged in sequence along the circumference of the planetary carrier assembly 2. Specifically, along the circumference of the planetary carrier assembly 2, a planetary gear component 501 is arranged between any two adjacent second gears 403, and a second gear 403 is arranged between any two adjacent planetary gear components 501.

[0067] It should be noted that the inner diameter of the second gear 403 refers to the inner diameter of the first orbital ring formed when the second gear 403 is in the process of orbiting; wherein the output axis of the differential assembly 5 refers to the rotation axis of the side gear 502 in the differential.

[0068] Specifically, Figure 7 As shown, an avoidance portion 2022 that matches the second gear 403 one-to-one can be provided on the output cavity 202 to make the inner diameter of the revolution of the second gear 403 smaller than the outer diameter of the revolution of the planetary gear component 501; at the same time, the area between two adjacent avoidance portions 2022 is used to be fixedly connected with the planetary gear component 501 in the differential assembly 5.

[0069] In this embodiment, the second gear 403 and the planetary gear component 501 are alternately arranged along the circumference of the planetary carrier assembly 2, and the inner diameter of the second gear 403 is smaller than the outer diameter of the planetary gear component 501, so that the radial size of the housing assembly 1 can be effectively reduced, the space required for its arrangement can be reduced, and the adaptability of its arrangement can be improved.

[0070] In an optional embodiment, if Figures 4 to 5 As shown, both ends of the planet carrier assembly 2 along its axial direction are rotatably connected to the housing assembly 1 through bearings.

[0071] In this embodiment, by rotatably connecting both ends of the planetary carrier assembly 2 to the housing assembly 1, the stability of the rotation of the planetary carrier assembly 2 can be improved, thereby improving its dynamic balance performance, reducing vibration and noise, and improving NVH performance.

[0072] In an optional embodiment, if Figure 7 As shown, an input through hole 2011 and a first output through hole 2012 are sequentially arranged on the driving cavity 201 along the axis of the sun gear assembly 3 and close to the output cavity 202. The input through hole 2011 is used for the rotating shaft 601 of the rotating driving device 6 to pass through and be transmission-connected with the sun gear assembly 3. A second output through hole 2021 is arranged on the output cavity 202 at a position away from the driving cavity 201 along the axis of the sun gear assembly 3. The first output through hole 2012 and the second output through hole 2021 are respectively used for the output shafts on both sides of the differential assembly 5 to pass through.

[0073] It should be noted that the rotating shaft 601 of the rotating drive device 6 passes through the input through-hole 2011, which means that the rotating shaft 601 of the rotating drive device 6 and the input through-hole 2011 can be matched with each other in an interval manner or in a rotational contact manner. Of course, rotational contact manner is preferred, which can improve the rotational stability of the rotating shaft 601 of the rotating drive device 6, reduce rotational noise and improve its dynamic balance performance; similarly, the output shafts on both sides of the differential assembly 5 respectively pass through the first output through-hole 2012 and the second output through-hole 2021, and the matching method can be either an interval matching method or a rotational contact matching method. Of course, rotational contact matching is preferred.

[0074] In this embodiment, by setting the input through hole 2011, the sun gear assembly 3 can be conveniently connected to the rotating shaft 601 of the rotating drive device 6, and by setting the first output through hole 2012 and the second output through hole 2021, the differential assembly 5 can be conveniently connected to the output shafts on both sides thereof.

[0075] In an optional embodiment, if Figure 4 As shown, the outer diameter of the sun gear assembly 3 is smaller than the diameter of the input through hole 2011 .

[0076] In some embodiments not shown, the sun gear assembly 3 may be a part of the rotating shaft 601 of the rotating drive device 6. Since the outer diameter of the sun gear assembly 3 is smaller than the diameter of the input through hole 2011, the sun gear assembly 3 can conveniently enter the driving cavity 201 along with the rotating shaft 601 of the rotating drive device 6 through the input through hole 2011.

[0077] It should be noted that the outer diameter of the sun gear assembly 3 and the specific size of the input through hole 2011 can be selected and adjusted according to actual needs.

[0078] In this embodiment, the outer diameter of the sun gear assembly 3 is smaller than the diameter of the input through hole 2011 , which can facilitate the installation of the sun gear assembly 3 into the driving cavity 201 .

[0079] In an optional embodiment, if Figures 4 to 5 As shown, one end of the sun gear assembly 3 is rotationally connected to the input via 2011; and / or, the other end of the sun gear assembly 3 is rotationally connected to the first output via 2012; and / or, the half-axle gear 502 in the differential assembly 5 close to the first output via 2012 is rotationally connected to the first output via 2012; and / or, the half-axle gear 502 in the differential assembly 5 close to the second output via 2021 is rotationally connected to the second output via 2021.

[0080] In this embodiment, by rotatably connecting the two ends of the sun gear assembly 3 to the input via 2011 and the first output via 2012 respectively, the rotational dynamic balance performance of the sun gear assembly 3 can be improved, the rotational vibration and the noise generated thereby can be reduced, and the NVH performance can be improved.

[0081] According to an embodiment of the present application, in a second aspect, a power system is provided, such as Figure 5 As shown, it includes a rotation driving device 6 and a coaxial transmission device as in any one embodiment of the first aspect, and the rotation shaft 601 of the rotation driving device 6 is coaxially connected to the sun gear assembly 3.

[0082] Specifically, the rotary drive device 6 can be any rotating power source such as an engine, a motor, etc.

[0083] In this embodiment, because the power system includes a coaxial transmission device, it has the same effect as the coaxial transmission device and is not described in detail here.

[0084] According to an embodiment of the present application, in a third aspect, a vehicle is provided, comprising a coaxial transmission device as in any one embodiment of the first aspect; and / or a power system as in the second aspect.

[0085] Specifically, the vehicle may be an SUV, a sedan, an MPV or the like having a coaxial transmission device.

[0086] In this embodiment, because the vehicle includes a coaxial transmission device, it has the same effect as the coaxial transmission device and is not described in detail here.

[0087] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A coaxial transmission device, characterized in that: include: A housing assembly (1), wherein an inner gear ring component (101) is arranged inside the housing assembly (1); A planet carrier assembly (2), the planet carrier assembly (2) being rotatably arranged around its axis within the housing assembly (1), the planet carrier assembly (2) being provided with a driving chamber (201) and an output chamber (202) along its axial direction; a sun gear assembly (3), the sun gear assembly (3) being arranged in the driving chamber (201) so as to rotate about its axis, the axis of the sun gear assembly (3) being coincident with the axis of the planet carrier assembly (2), the sun gear assembly (3) being used for transmission connection with the rotating shaft (601) of the rotating driving device (6); a planetary gear assembly (4), wherein a plurality of the planetary gear assemblies (4) are provided and are evenly distributed along the circumference of the planetary carrier assembly (2), the planetary gear assembly (4) is meshed with the sun gear assembly (3) and the inner gear ring component (101), and both ends of the rotating shaft (401) of the planetary gear assembly (4) are connected to the planetary carrier assembly (2); and A differential assembly (5), wherein the differential assembly (5) is rotatably arranged around its output axis in the output cavity (202), and the output axis of the differential assembly (5) coincides with the axis of the planetary carrier assembly (2), and the planetary gear component (501) of the differential assembly (5) is fixedly connected to the planetary carrier assembly (2).

2. The coaxial transmission device according to claim 1, characterized in that: The planetary gear assembly (4) comprises the rotating shaft (401), a first gear (402) and a second gear (403); the first gear (402) and the second gear (403) are arranged on the rotating shaft (401) to rotate synchronously; the first gear (402) is meshed with the sun gear assembly (3), and the second gear (403) is meshed with the inner gear ring component (101).

3. The coaxial transmission device according to claim 2, characterized in that: The number of the planetary gear components (501) in the differential assembly (5) is the same as the number of the planetary gear assemblies (4).

4. The coaxial transmission device according to claim 3, characterized in that: The plurality of second gears (403) and the plurality of planetary gear components (501) are alternately arranged in sequence along the circumference of the planetary carrier assembly (2); the orbital inner diameter of the second gear (403) is smaller than the outer diameter of the output chamber (202).

5. The coaxial transmission device according to any one of claims 1 to 4, characterized in that: The two ends of the planetary carrier assembly (2) along its axial direction are rotatably connected to the housing assembly (1).

6. The coaxial transmission device according to any one of claims 1 to 4, characterized in that: An input through hole (2011) and a first output through hole (2012) are sequentially arranged on the driving cavity (201) along the axis of the sun gear assembly (3) and close to the output cavity (202); the input through hole (2011) is used for the rotation shaft (601) of the rotation driving device (6) to pass through and be transmission-connected with the sun gear assembly (3); a second output through hole (2021) is arranged on the output cavity (202) at a position away from the driving cavity (201) along the axis of the sun gear assembly (3); the first output through hole (2012) and the second output through hole (2021) are respectively used for the output shafts on both sides of the differential assembly (5) to pass through.

7. The coaxial transmission device according to claim 6, characterized in that: The outer diameter of the sun gear assembly (3) is smaller than the diameter of the input through hole (2011).

8. The coaxial transmission device according to claim 6, characterized in that: One end of the sun gear assembly (3) is rotatably connected to the input through hole (2011); And / or, the other end of the sun gear assembly (3) is rotatably connected to the first output via (2012); and / or, a half-axle gear (502) in the differential assembly (5) close to the first output through hole (2012) is rotationally connected to the first output through hole (2012); And / or, the half-shaft gear (502) in the differential assembly (5) close to the second output through hole (2021) is rotationally connected to the second output through hole (2021).

9. A power system, characterized in that: It comprises a rotary drive device (6) and a coaxial transmission device as claimed in any one of claims 1 to 8, wherein the rotary shaft (601) of the rotary drive device (6) is coaxially connected to the sun gear assembly (3).

10. A vehicle, characterized in that: A coaxial transmission device comprising any one of claims 1 to 8; And / or, a power system as described in claim 9.

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