Pure electric single planet row driving system

Abstract

The utility model discloses a pure electric single planet row driving system which comprises a first motor and a second motor which are symmetrically arranged, a motor shaft of the first motor and a motor shaft of the second motor are coaxial and oppositely arranged, one side of the motor shaft of the first motor is provided with a first output shaft and a second output shaft which are parallel to the motor shaft of the first motor and are symmetrically arranged, and the other side of the motor shaft of the first motor is provided with a first planet row. The distance between the first output shaft and the first motor is equal to the distance between the second output shaft and the second motor, and hubs are fixedly arranged on the first output shaft and the second output shaft. The first output shaft and a motor shaft of the first motor are in transmission connection through a transmission assembly, and the second output shaft and a motor shaft of the second motor are in transmission connection through a transmission assembly. The hub drive system has the advantages that the design is exquisite, a traditional differential mechanism is omitted, the first motor and the second motor drive the corresponding hubs respectively, the speed difference between the two hubs can be achieved, and the requirements under more working conditions are met.

Description

Technical Field

[0001] The utility model relates to the technical field of transmissions, and in particular to a pure electric single planetary gear drive system. Background Art

[0002] With the increasing demand of pure electric vehicles for high power, high power saving and reduced cost of pure electric drive axles, especially for the future development of electric-electric hybrid drive axles for fuel cell vehicles, dual-motor electric drive axles have become a key to solving the above problems.

[0003] For example, Chinese patent No. 2018112309546 discloses a dual-motor pure electric multi-mode power system and its driving method. The system includes a main motor and an auxiliary motor. The main motor and the auxiliary motor drive the differential assembly to rotate respectively. The differential assembly outputs power. The main motor and the auxiliary motor are connected to the differential respectively. The planetary assembly, when the dual motors are started, drive the main drive gear and the auxiliary drive gear to rotate, gradually increase the speed of the main motor, the main drive gear drives the input gear and then drives the sun gear while the auxiliary drive gear drives the ring gear. The sun gear and the ring gear generate power superposition transmission planetary gear, the planetary gear drives the swing arm, and the swing arm outputs a high-speed power mode. However, the system uses a differential as the final transmission device, and has extremely high requirements for the power output and speed synchronization control of the dual motors, so it has great limitations in processing and control. At the same time, the presence of the differential will make it difficult to reduce the volume, weight, transmission efficiency and ground clearance of the system. In addition, the motor directly drives the planetary gear to rotate through the motor shaft gear, which will cause the motor shaft of the motor to deflect too much, bend and deform, and affect the service life. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a pure electric single planetary gear drive system.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A pure electric single planetary gear drive system comprises a first motor and a second motor which are symmetrically arranged, wherein the motor shaft of the first motor and the motor shaft of the second motor are coaxial and arranged facing each other, a first output shaft and a second output shaft which are parallel and symmetrically arranged are arranged on one side of the motor shaft of the first motor, the distance between the first output shaft and the first motor is equal to the distance between the second output shaft and the second motor, hubs are fixedly arranged on the first output shaft and the second output shaft, and the first output shaft and the motor shaft of the first motor, as well as the second output shaft and the motor shaft of the second motor, are both connected in transmission via a transmission assembly.

[0007] Preferably, the transmission assembly at least includes a sun gear fixed on the motor shafts of the first motor and the second motor, the sun gear is sleeved with a ring gear fixed on the transmission housing, a planetary gear meshing with the ring gear and the sun gear is provided between the ring gear and the sun gear, a planetary carrier is fixed on the planetary gear, a drive wheel is fixed on the planetary carrier, and a transmission wheel is fixed on the first output shaft and the second output shaft, and the transmission wheel meshes with the drive wheel.

[0008] Preferably, the transmission assembly at least includes a sun gear fixed on the motor shafts of the first motor and the second motor, a ring gear is provided on the sun gear, a planetary gear meshing with the ring gear and the sun gear is provided between the ring gear and the sun gear, a planetary carrier is fixed on the planetary gear, the planetary carrier is fixed on the transmission housing, a driving wheel is fixed on the ring gear, and a transmission wheel is fixed on the first output shaft and the second output shaft, and the transmission wheel meshes with the driving wheel.

[0009] Preferably, the transmission assembly is located between the first motor and the second motor.

[0010] Preferably, the first motor and the second motor are both electrically connected to a battery.

[0011] Preferably, a release clutch sleeve is provided on the first output shaft, and a synchronizer is provided on the second output shaft, and the synchronizer can be coupled with the release clutch sleeve.

[0012] The beneficial effects of the utility model are mainly reflected in:

[0013] 1. The system has an exquisite design. The traditional differential is eliminated. The first motor and the second motor drive the corresponding wheel hubs respectively, which can achieve the speed difference between the two wheel hubs and meet the needs of more working conditions. In addition, the system is easy to process and assemble, reduces work intensity, improves work efficiency, and has wide practicality;

[0014] 2. The motor shaft of the first motor and the motor shaft of the second motor are coaxial and arranged in opposite directions, which can minimize the radial occupied space and make the structure more compact. At the same time, the system adopts planetary gear transmission, which can make the system have a larger transmission ratio, reduce the volume and weight of the system assembly, and facilitate reasonable layout;

[0015] 3. The sun gear is fixed on the motor shaft, and the planetary gear is sleeved on the sun gear. When the motor shafts of the first motor and the second motor transmit power to the planetary gear through the sun gear, the sun gear is evenly stressed all around, which can avoid bending of the motor shaft, extend service life and improve safety;

[0016] 4. When an electric vehicle is driving in a harsh working condition, the synchronizer is coupled with the clutch sleeve to enhance the torque of the vehicle, thereby improving adhesion, allowing the vehicle to escape in time and ensuring safe driving of the vehicle. At the same time, this design can select a low-specification motor while meeting the same climbing power, thereby greatly reducing the weight and cost of the vehicle, enhancing the acceleration and off-road capabilities of the vehicle, and improving the vehicle's handling safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0018] Figure 1 : A schematic structural diagram of the first preferred embodiment of the utility model;

[0019] Figure 2 : A schematic structural diagram of a second preferred embodiment of the utility model. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0022] like Figure 1 to Figure 2 As shown, the utility model discloses a pure electric single planetary gear drive system, including a first motor 1 and a second motor 2 symmetrically arranged, and the first motor 1 and the second motor 2 are both electrically connected to a battery. The motor shaft of the first motor 1 and the motor shaft of the second motor 2 are coaxial and arranged in opposite directions. One side of the motor shaft of the first motor 1 is provided with a first output shaft 3 and a second output shaft 4 parallel and symmetrically arranged therewith, and the distance between the first output shaft 3 and the first motor 1 is equal to the distance between the second output shaft 4 and the second motor 2. The first output shaft 3 and the second output shaft 4 are both fixed with a hub 5, and the first output shaft 3 and the motor shaft of the first motor 1 and the second output shaft 4 and the motor shaft of the second motor 2 are both connected by transmission assembly 6. The above design is exquisite, the motor shaft of the first motor 1 and the motor shaft of the second motor 2 are coaxial and arranged in opposite directions, which can minimize the radial occupied space and make the structure more compact. At the same time, the system adopts planetary gear transmission, which can make the system have a larger transmission ratio, reduce the volume and weight of the system assembly, and facilitate reasonable layout. In addition, the system eliminates the traditional differential, and the first motor and the second motor drive the corresponding wheel hubs respectively, which can achieve a speed difference between the two wheel hubs, meet the needs of more working conditions, and have a wider applicability.

[0023] like Figure 1 As shown, it is a first preferred embodiment of the utility model, the transmission assembly 6 is located between the first motor 1 and the second motor 2, the transmission assembly 6 at least includes a sun gear 61 fixedly mounted on the motor shafts of the first motor 1 and the second motor 2, the sun gear 61 is sleeved with a ring gear 62 fixedly mounted on the transmission housing, a planetary gear 63 meshing with the ring gear 62 and the sun gear 61 is provided between the ring gear 62 and the sun gear 61, a planetary carrier 64 is fixedly mounted on the planetary carrier 64, a drive wheel 65 is fixedly mounted on the planetary carrier 64, a transmission wheel 66 is fixedly mounted on the first output shaft 3 and the second output shaft 4, and the transmission wheel 66 meshes with the drive wheel 65.

[0024] The working process of the first preferred embodiment is briefly described below:

[0025] The first motor 1 and the second motor 2 are started, and the power is transmitted to the wheel hubs on the first output shaft 3 and the second output shaft 4 through the sun gear 61, the planetary gear 63, the planetary carrier 64, the driving wheel 65 and the transmission wheel 66, thereby driving the vehicle to travel.

[0026] like Figure 2 As shown, it is a second preferred embodiment of the utility model, the transmission assembly 6 is located between the first motor 1 and the second motor 2, and the transmission assembly 6 at least includes a sun gear 61 fixedly mounted on the motor shafts of the first motor 1 and the second motor 2, and a ring gear 62 is sleeved on the sun gear 61, and a planetary gear 63 meshing with the ring gear 62 and the sun gear 61 is provided between the ring gear 62 and the sun gear 61, and a planetary carrier 64 is fixedly mounted on the planetary gear 63, and the planetary carrier 64 is fixedly mounted on the transmission housing, and a driving wheel 65 is fixedly mounted on the ring gear 62, and a transmission wheel 66 is fixedly mounted on the first output shaft 3 and the second output shaft 4, and the transmission wheel 66 meshes with the driving wheel 65.

[0027] The working process of the second preferred embodiment is briefly described below:

[0028] The first motor 1 and the second motor 2 are started, and the power is transmitted to the wheel hubs on the first output shaft 3 and the second output shaft 4 through the sun gear 61, the planetary gear 63, the ring gear 62, the drive wheel 65 and the transmission wheel 66, thereby driving the vehicle to travel.

[0029] In the utility model, the sun gear 61 is fixed on the motor shaft, and the planetary gear is sleeved on the sun gear. When the motor shafts of the first motor and the second motor transmit power to the planetary gear through the sun gear 61, the sun gear 61 is subjected to uniform force all around, which can avoid bending of the motor shaft, extend the service life and improve safety.

[0030] In this preferred embodiment, the first output shaft 3 is provided with a release clutch sleeve 31, and the second output shaft 4 is provided with a synchronizer 41, and the synchronizer 41 can be coupled with the release clutch sleeve 31. When the electric vehicle is driving in a bad working condition, the synchronizer is coupled with the release clutch sleeve to enhance the torque of the vehicle, thereby improving the adhesion, so that the vehicle can be released in time and ensure the safe driving of the vehicle. At the same time, this design can select a low-specification motor while meeting the same climbing power, thereby greatly reducing the weight and cost of the whole vehicle, enhancing the acceleration and off-road capabilities of the vehicle, and improving the handling safety of the vehicle.

[0031] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0032] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model. They are not intended to limit the protection scope of the utility model. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A pure electric single planetary gear drive system, comprising a first motor (1) and a second motor (2) symmetrically arranged, characterized in that: The motor shaft of the first motor (1) and the motor shaft of the second motor (2) are coaxial and arranged facing each other; a first output shaft (3) and a second output shaft (4) are provided on one side of the motor shaft of the first motor (1) and are arranged parallel to and symmetrically therewith; the distance between the first output shaft (3) and the first motor (1) is equal to the distance between the second output shaft (4) and the second motor (2); a hub (5) is fixedly provided on the first output shaft (3) and the second output shaft (4); the first output shaft (3) and the motor shaft of the first motor (1) and the second output shaft (4) and the motor shaft of the second motor (2) are both connected in transmission via a transmission assembly (6).

2. The pure electric single planetary gear drive system according to claim 1, characterized in that: The transmission assembly (6) comprises at least a sun gear (61) fixedly mounted on the motor shafts of the first motor (1) and the second motor (2); a ring gear (62) fixedly mounted on the transmission housing is sleeved on the sun gear (61); a planet gear (63) meshing with the ring gear (62) and the sun gear (61) is arranged between the ring gear (62) and the sun gear (61); a planet carrier (64) is fixedly mounted on the planet gear (63); a drive wheel (65) is fixedly mounted on the planet carrier (64); a transmission wheel (66) is fixedly mounted on the first output shaft (3) and the second output shaft (4); and the transmission wheel (66) meshes with the drive wheel (65).

3. The pure electric single planetary gear drive system according to claim 1, characterized in that: The transmission assembly (6) comprises at least a sun gear (61) fixedly mounted on the motor shafts of the first motor (1) and the second motor (2); a ring gear (62) is sleeved on the sun gear (61); a planet gear (63) meshing with the ring gear (62) and the sun gear (61) is arranged between the ring gear (62) and the sun gear (61); a planet carrier (64) is fixedly mounted on the planet gear (63); the planet carrier (64) is fixedly mounted on the transmission housing; a driving wheel (65) is fixedly mounted on the ring gear (62); and a transmission wheel (66) is fixedly mounted on the first output shaft (3) and the second output shaft (4); the transmission wheel (66) meshes with the driving wheel (65).

4. The pure electric single planetary gear drive system according to claim 1, characterized in that: The transmission assembly (6) is located between the first motor (1) and the second motor (2).

5. The pure electric single planetary gear drive system according to claim 4, characterized in that: The first motor (1) and the second motor (2) are both electrically connected to a battery.

6. The pure electric single planetary gear drive system according to claim 2 or 3, characterized in that: The first output shaft (3) is provided with a clutch release sleeve (31), and the second output shaft (4) is provided with a synchronizer (41), and the synchronizer (41) can be coupled to the clutch release sleeve (31).

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