Power assembly system of pure electric vehicle

Abstract

The utility model discloses a pure electric vehicle power assembly system which comprises a first motor, a second motor and a differential mechanism receiving power of the first motor and the second motor, and motor shafts of the first motor and the second motor are parallel and output in the same direction. Half shafts which are coaxially arranged are arranged on the two sides of the differential mechanism, a transmission gear is arranged on a shell of the differential mechanism, the transmission gear is in dynamic coupling with motor shafts of the first motor and the second motor through the same transmission assembly, and the transmission assembly is a planetary gear train and at least comprises a sun gear for receiving power and a driving gear for outputting power. The sun gear is fixed to a motor shaft of the first motor / the second motor, and the driving gear is meshed with the transmission gear. The utility model mainly has the advantages that the solid input shaft can bear larger torque, the deflection is reduced, the situation that the input shaft is broken due to the fact that the input shaft bears overlarge torque is avoided, the service life is prolonged, and the safety is improved at the same time.

Description

Technical Field

[0001] This utility model relates to the field of transmission shifting technology, and more specifically, to a powertrain system for pure electric vehicles. Background Technology

[0002] Pure electric vehicles have become the development direction for clean and efficient automobiles, one of the best ways to solve environmental protection and energy conservation problems, and an inevitable choice for the sustainable development of my country's automotive industry. The choice of powertrain configuration for pure electric vehicles has become a hot topic in current research on pure electric vehicle powertrain technology. Different arrangements, methods, and control strategies of electric motors have resulted in a wide variety of structural forms.

[0003] For example, patent number 202310219136.0 discloses an integrated electric drive axle assembly, including: a first drive motor and a second drive motor. The first drive motor is connected to a first input shaft drive gear via a first input shaft. The first input shaft drive gear meshes with a large gear ring. The large gear ring is connected to a third sliding sleeve. A second hollow shaft gear is loosely fitted on the large gear ring. The second hollow shaft gear meshes with a second driven gear. The second driven gear is located at one end of an intermediate shaft, and the other end is connected to a third driven gear. The third driven gear meshes with a differential gear. The differential gear is fixedly connected to the differential, which is connected to the wheels via two half-shafts. The second drive motor is connected to the second input shaft drive gear via a second input shaft. The second input shaft is coaxial with the power take-off (PTO) shaft, and a flange is connected to the end of the PTO shaft. The second input shaft drive gear meshes with one side of the idler gear, and the other side of the idler gear meshes with the sun gear. The sun gear meshes with planet gears, and the planet gears mesh with the large ring gear. The planet gears are located at one end of the planet carrier, and the other end of the planet carrier is connected to a first sliding sleeve. The first sliding sleeve contacts the housing gear and can be separated from the housing gear. However, the hollow shaft structure in this assembly is loosely fitted onto the drive axle half-shaft, which may cause the hollow shaft structure to break. In addition, the transmission system has a complex structure, occupies a large space, and is inconvenient to install, thus having significant limitations. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a powertrain system for pure electric vehicles.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A powertrain system for a pure electric vehicle includes a first motor, a second motor, and a differential that receives power from the first motor and the second motor. The motor shafts of the first motor and the second motor are parallel and output power in the same direction. The differential has coaxially arranged half-shafts on both sides, and a transmission gear is provided on the housing of the differential. The transmission gear is poweredly coupled to the motor shafts of the first motor and the second motor respectively through the same transmission assembly. The transmission assembly is a planetary gear system, which includes at least a sun gear that receives power and a drive gear that outputs power. The sun gear is fixed on the motor shaft of the first motor / second motor, and the drive gear meshes with the transmission gear.

[0007] Preferably, the transmission assembly further includes a planet carrier and planetary gears pivotally mounted thereon. The inner side of each planetary gear is provided with a sun gear that meshes with it, and the outer side of each planetary gear is provided with a gear ring that meshes with it. The gear ring is fixed on the transmission, and the drive gear is fixedly mounted on the other side of the planet carrier opposite to the planetary gears. The drive gear is coaxially arranged with the sun gear.

[0008] Preferably, the transmission assembly further includes a planetary carrier fixed on the transmission, on which planetary gears are pivotally mounted, with a sun gear meshing with the inner side of each planetary gear, and a ring gear meshing with the outer side of each planetary gear. The drive gear is fixedly mounted on the other side of the ring gear opposite to the planetary gears, and the drive gear is coaxial with the sun gear.

[0009] Preferably, the first motor and the second motor are close to each other and symmetrically arranged, with the half-shaft passing between them.

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

[0011] Preferably, a hub is fixed on the half-shaft.

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

[0013] 1. Using a solid input shaft can withstand greater torque, reduce deflection, and avoid input shaft breakage caused by excessive torque on the input bearing, thus extending service life and improving safety.

[0014] 2. By using two identical transmission components as power transmission parts, the number of parts is reduced, the design and manufacturing process of the parts are optimized, the system complexity is reduced, the reliability and production efficiency are improved, and the vehicle weight reduction is also achieved.

[0015] 3. The transmission components adopt a planetary gear train structure, which enables the entire powertrain system to have a large transmission ratio, reducing the size and weight of the system assembly, making the layout more compact, with high load-bearing capacity and high transmission efficiency; at the same time, the multiple planetary gears in the planetary gear train are evenly distributed, so the load change during gear meshing is relatively small, and the entire system moves smoothly with low noise.

[0016] 4. The close proximity of the first and second motors reduces the radial space occupied, making the system structure more compact, making full use of the gearbox space, and ensuring that the vehicle has a good overall structure and reasonable layout. Attached Figure Description

[0017] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

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

[0019] Figure 2 : A schematic diagram of the structure of the second embodiment of this utility model. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

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

[0022] like Figures 1 to 2 As shown, this utility model discloses a powertrain system for a pure electric vehicle, including a first motor 1 and a second motor 2, which are positioned vertically and electrically connected to a battery. The first motor 1 and the second motor 2 are close to each other and symmetrically arranged. This close proximity reduces radial space occupation, making the system structure more compact, fully utilizing the gearbox space, and ensuring the vehicle has a good overall structure and layout rationality. Of course, the first motor 1 and the second motor 2 can also share a single motor housing to achieve an optimal layout; these are all within the scope of this utility model and will not be elaborated upon here.

[0023] The motor shafts of the first motor 1 and the second motor 2 are parallel and output in the same direction. A differential 3 is provided between the first motor 1 and the second motor 2. Half shafts 6 are coaxially arranged on both sides of the differential 3. A hub 61 is fixed on the half shaft 6. The distance between the half shaft 6 and the first motor 1 is equal to the distance between the half shaft 6 and the second motor 2. This design makes the first motor 1 and the second motor 2 symmetrically arranged on both sides of the half shaft 6, providing the shortest mechanical transmission path, high transmission efficiency, and suitable for low-load power drive across the entire speed range.

[0024] The differential 3 is also fixedly equipped with a transmission gear 4, which is power-coupled to the motor shafts of the first motor 1 and the second motor 2 respectively through the same transmission assembly 5. In this embodiment, the motor shafts of the first motor 1 and the second motor 2 are solid input shafts, or solid input shafts are fixedly mounted on the motor shafts of the first motor 1 and the second motor 2. Using solid input shafts can bear greater torque, reduce deflection, and avoid input shaft breakage caused by excessive torque on the input bearing, thus extending service life and improving safety. In addition, the transmission assembly 5 is a planetary gear transmission, which allows the system to have a larger transmission ratio, reducing the size and weight of the system assembly.

[0025] like Figure 1 As shown in the schematic diagram of the first embodiment, the transmission assembly 5 includes a planetary carrier 54 and planetary gears 53 pivotally mounted thereon. A sun gear 51 meshes with the inner side of the planetary gears 53 and is fixedly mounted on the motor shaft of the first motor 1 or the second motor 2. A gear ring 52 meshes with the outer side of the planetary gears 53 and is fixedly mounted on the transmission. A drive gear 55 is also provided on the planetary carrier 54 and meshes with the transmission gear 4.

[0026] The working process of the first embodiment is briefly described below:

[0027] When the first motor 1 and the second motor 2 start, they drive the corresponding sun gear 51 to rotate through their motor shafts. The rotation of the sun gear 51 drives the planet gear 53 meshing with it to revolve around it, thereby driving the planet carrier 54 to rotate. The rotation of the planet carrier 54 drives the transmission gear 4 to rotate through the drive gear 55, thereby driving the half shafts on both sides of the differential 3 to rotate, thus realizing power transmission.

[0028] like Figure 2As shown in the schematic diagram of the second embodiment, the transmission assembly 5 includes a planetary carrier 54 fixed on the gearbox, a planetary gear 53 pivotally mounted on the planetary carrier 54, a sun gear 51 meshing with the inner side of the planetary gear 53, and the sun gear 51 fixed on the motor shaft of the first motor 1 or the second motor 2; a gear ring 52 meshing with the outer side of the planetary gear 53, and a drive gear 55 mounted on the gear ring 52, the drive gear 55 meshing with the transmission gear 4.

[0029] The working process of the second embodiment is briefly described below:

[0030] When the first motor 1 and the second motor 2 start, they drive the corresponding sun gear 51 to rotate through their motor shafts. The rotation of the sun gear 51 drives the planet gear 53 to rotate on the planet carrier 54. The rotation of the planet gear 53 drives the gear ring 52 meshing with it to revolve around it. The revolve of the gear ring 52 drives the transmission gear 4 to rotate through the drive gear 55, thereby driving the half shafts on both sides of the differential 3 to rotate, thus realizing power transmission.

[0031] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0032] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A powertrain system for pure electric vehicles, characterized in that: The device includes a first motor (1), a second motor (2), and a differential (3) that receives power from the first motor (1) and the second motor (2). The motor shafts of the first motor (1) and the second motor (2) are parallel and output in the same direction. The differential (3) has coaxially arranged half shafts (6) on both sides. The housing of the differential (3) is provided with a transmission gear (4). The transmission gear (4) is coupled to the motor shafts of the first motor (1) and the second motor (2) through the same transmission assembly (5). The transmission assembly (5) is a planetary gear system, which includes at least a sun gear (51) that receives power and a drive gear (55) that outputs power. The sun gear (51) is fixed on the motor shaft of the first motor (1) / second motor (2). The drive gear (55) meshes with the transmission gear (4).

2. The pure electric vehicle powertrain system according to claim 1, characterized in that: The transmission assembly (5) also includes a planet carrier (54) and planet gears (53) pivotally mounted thereon. The inner side of the planet gears (53) is provided with a sun gear (51) meshing with it, and the outer side of the planet gears (53) is provided with a gear ring (52) meshing with it. The gear ring (52) is fixed on the transmission. The drive gear (55) is fixedly mounted on the other side of the planet carrier (54) opposite to the planet gears (53). The drive gear (55) and the sun gear (51) are coaxially arranged.

3. The pure electric vehicle powertrain system according to claim 1, characterized in that: The transmission assembly (5) also includes a planet carrier (54) fixed on the transmission. The planet carrier (54) is pivotally provided with planet gears (53). The inner side of the planet gears (53) is provided with the sun gear (51) meshing with it. The outer side of the planet gears (53) is provided with the gear ring (52) meshing with it. The drive gear (55) is fixedly provided on the other side of the gear ring (52) opposite to the planet gears (53). The drive gear (55) and the sun gear (51) are coaxially arranged.

4. The pure electric vehicle powertrain system according to any one of claims 1-3, characterized in that: The first motor (1) and the second motor (2) are close to each other and symmetrically arranged, and the half shaft (6) passes between them.

5. The pure electric vehicle powertrain system according to claim 4, characterized in that: The first motor (1) and the second motor (2) are electrically connected to the storage battery.

6. The pure electric vehicle powertrain system according to claim 5, characterized in that: A hub (61) is fixed on the half shaft (6).

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