Electric ATV Single Motor Drive System

Abstract

The present invention discloses a single-motor drive system for an electric all-terrain vehicle. The rear transmission case assembly includes a motor, a rear reduction gear set, and a rear differential, which are connected in sequence. The rear differential is connected to the left and right rear half shafts, and the rear differential is equipped with a rear differential lock. A two-to-four-wheel drive conversion device is installed on one of the gear shafts of the rear reduction gear set. The front transmission case assembly includes a front reduction gear set and a front differential, which are connected in sequence. The front differential is connected to the left and right front half shafts, and the front differential is equipped with a front differential lock. One end of the drive shaft is connected to the two-to-four-wheel drive conversion device, and the other end is connected to one of the gear shafts of the front reduction gear set. By switching the two-to-four-wheel drive conversion device, the power of the motor can be transmitted to the front transmission case assembly via the drive shaft. The beneficial effects of the present invention are: excellent driving performance, the ability to achieve two-to-four-wheel drive switching, and filling the market gap for electric all-terrain vehicles.

Description

Technical Field

[0001] The present invention relates to an all-terrain vehicle drive system, and in particular to a single-motor drive system for an electric all-terrain vehicle. Background Art

[0002] All-terrain vehicles (ATVs) are vehicles that can travel on any terrain, easily maneuvering over terrain where ordinary vehicles would struggle. These vehicles are versatile and unrestricted by road conditions, and their application is expanding year by year.

[0003] At present, "carbon peak and carbon neutrality" have been broken down into indicators in all walks of life, and "new energy and zero emissions" have been rapidly implemented in the automotive industry. The future trend of electrification is getting closer and closer. The electrification industry chain will inevitably become more and more perfect with the development of new energy vehicles, but high-performance electric all-terrain vehicle products are still blank. Summary of the Invention

[0004] In view of this, the present invention provides an electric all-terrain vehicle single-motor drive system with excellent driving performance and capable of switching between two-wheel drive and four-wheel drive, filling the market gap in electric all-terrain vehicles.

[0005] To achieve the above purpose, the technical solution of the present invention is as follows:

[0006] An electric all-terrain vehicle single-motor drive system comprises:

[0007] A rear transmission case assembly includes a motor, a rear reduction gear set, and a rear differential connected in sequence, wherein the rear differential is connected to the left and right rear half shafts, the rear differential is equipped with a rear differential lock, and a two-to-four-wheel drive conversion device is installed on one of the gear shafts of the rear reduction gear set;

[0008] A front transmission case assembly, comprising a front reduction gear set and a front differential connected in a power manner, wherein the front differential is connected to the left and right front half shafts, and the front differential is equipped with a front differential lock; and

[0009] A transmission shaft, one end of which is connected to the two-wheel drive conversion device, and the other end is connected to one of the gear shafts of the front reduction gear set. By switching the two-wheel drive conversion device, the power of the motor can be transmitted to the front transmission box assembly through the transmission shaft.

[0010] Preferably, the output shaft of the motor is parallel to or perpendicular to the left rear half shaft.

[0011] Preferably, the rear reduction gear set includes a first gear, a second gear, a third gear, a fourth gear and a fifth gear that are sequentially connected in power, wherein the third gear and the fourth gear are fixed on the same gear shaft, the two-wheel drive to four-wheel drive conversion device is connected to the gear shaft, and the fifth gear is dynamically connected to the rear differential.

[0012] Preferably, the front reduction gear set includes a sixth gear and a seventh gear that mesh with each other, the gear shaft of the sixth gear is connected to the transmission shaft, and the seventh gear is dynamically connected to the front differential; the sixth gear has the same number of teeth as the fourth gear, and the seventh gear has the same number of teeth as the fifth gear.

[0013] Preferably, the transmission shaft consists of three sections, and two adjacent sections are connected by universal joints.

[0014] Preferably, the motor is a liquid-cooled permanent magnet synchronous motor or an AC asynchronous motor.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The rear-mounted single motor achieves dual- and four-wheel drive conversion by switching between them. The drive system solution provided by this invention can be expanded to various all-terrain vehicles, such as electric ATVs, electric UTVs, and electric SSVs, by adjusting the motor power and the transmission ratio of the reduction gear set, offering wide applicability and high versatility.

[0017] 2. The "two-wheel drive to four-wheel drive conversion device" is integrated into the rear transmission case assembly. When the vehicle is in two-wheel drive mode, the drive shaft does not need to transmit power, which can reduce drive shaft wear and vehicle vibration and noise, extend the life of the drive shaft, and improve system transmission efficiency and driving comfort.

[0018] 3. It is conducive to the whole vehicle sharing the same platform with fuel-powered or hybrid power solutions. The front transmission box assembly can be directly shared, and the rear transmission box assembly can be arranged in the same space with the fuel-powered solution. The frame does not require major adjustments, and one frame can meet the configuration of different power units.

[0019] 4. Both the front and rear transmission case assemblies are equipped with differential locks, which can realize the adaptive timely differential function of the front and rear wheels through electronic control strategies, reduce the risk of vehicle escape and high-speed driving stability, and improve the vehicle's off-road capability and high-speed driving stability.

[0020] 5. The platform has strong scalability. According to the needs of different vehicles, the drive shaft is not limited to the three-section structure of this solution, and the rear differential lock can also be optional, etc., to meet the configuration requirements of different all-terrain vehicles and improve the cost-effectiveness of the entire vehicle product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a schematic diagram of the structure of the single-motor drive system of an electric all-terrain vehicle (the motor output shaft and the half-shaft are arranged crosswise);

[0022] Figure 2 This is another structural schematic diagram of the single-motor drive system of an electric all-terrain vehicle (the motor output shaft is arranged parallel to the half-axle). DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0024] like Figure 1 As shown, a single-motor drive system for an electric all-terrain vehicle includes a rear transmission assembly A, a front transmission assembly B, and a drive shaft 7 connected between the rear transmission assembly A and the front transmission assembly B. The rear transmission assembly A includes a motor 1, a rear reduction gear set, and a rear differential 3, which are connected in sequence. The rear differential 3 is equipped with a rear differential lock 4. The rear differential 3 is connected to the left rear half-shaft a and the right rear half-shaft b.

[0025] In this embodiment, the rear reduction gear set includes a first gear Z1, a second gear Z2, a third gear Z3, a fourth gear Z4 and a fifth gear Z5 which are connected in sequence. The first gear Z1, the second gear Z2 and the third gear Z3 are meshed in sequence, and the number of teeth of these three gears is Z3>Z2>Z1. This design can achieve a first-stage speed reduction of the motor 1 and a first-stage torque increase of the driving power. Figure 1 As shown, the third gear Z3 and the fourth gear Z4 are fixed on the same gear shaft to achieve synchronous rotation. The fourth gear Z4 meshes with the fifth gear Z5, and the number of teeth is in the relationship of Z5>Z4. This design can achieve a two-stage speed reduction of the motor 1 and a two-stage torque increase of the driving power. The fifth gear Z5 is power-connected to the rear differential 3.

[0026] For example Figure 1 As shown, the front transmission assembly B includes a front reduction gear set and a front differential 9, both of which are connected in a dynamic manner. The front differential 9 is equipped with a front differential lock 6 and is connected to the left and right front axle shafts c and d. The rear transmission assembly A also houses a two-to-four-wheel drive conversion device 5, which is mounted on the gear shaft of the fourth gear Z4. The rear end of the drive shaft 7 is connected to the two-to-four-wheel drive conversion device 5, and the front end is in a dynamic connection with the front reduction gear set.

[0027] Based on the above structure, the ATV's drive system operates in four-wheel drive mode as follows: the switch of the two-wheel drive conversion device 5 is kept in the two-wheel drive position on the left side, the rear transmission assembly A and the drive shaft 7 remain disconnected, and the vehicle operates in rear-wheel drive mode only. In two-wheel drive mode, the rear differential lock 4 can be engaged or disengaged according to driving needs to meet different driving conditions.

[0028] The ATV's drive system operates in four-wheel-drive mode as follows: With the switch of the four-wheel-drive conversion device 5 held in the right four-wheel-drive position, the rear transmission assembly A and the drive shaft 7 remain spline-engaged, allowing the output power of the motor 1 to be synchronously transmitted to both the rear transmission assembly A and the front transmission assembly B. In four-wheel-drive mode, the front differential lock 6 and / or the rear differential lock 4 can be engaged or disengaged as needed to meet varying driving conditions.

[0029] In this embodiment, the front reduction gear set includes a meshing sixth gear Z6 and a seventh gear Z7. The gear shaft of the sixth gear Z6 is connected to the transmission shaft 7, and the seventh gear Z7 is power-connected to the front differential 9. Furthermore, the sixth gear Z6 and the fourth gear Z4 have the same number of teeth, while the seventh gear Z7 and the fifth gear Z5 have the same number of teeth. This layout theoretically achieves even distribution of power output and torque between the front and rear axles.

[0030] The motor 1 can adopt a high-power liquid-cooled permanent magnet synchronous motor, an AC asynchronous motor, or an integrated solution of a motor and a motor controller to realize a motor drive assembly with electric power output.

[0031] For example Figure 1 As shown, the transmission shaft 7 consists of three sections, and two adjacent sections are connected by a universal joint 7a. The left section is connected to the two-to-four-wheel drive conversion device 5, and the right section is connected to the gear shaft of the sixth gear Z6.

[0032] In view of the product characteristics of all-terrain vehicles of different sizes and types, the available space for power layout varies. In order to improve the space utilization rate of the power transmission device layout, this embodiment proposes two motor 1 layout configurations, namely: a cross-axis power device and a parallel-axis power device.

[0033] Please refer to Figure 1 The characteristic of the cross-axis power unit is that the output shaft of the motor 1 and the left rear half shaft a and the right rear half shaft b are arranged vertically and crosswise, which can reduce the space occupied by the motor 1 in the lateral direction of the vehicle and improve the longitudinal space utilization of the vehicle.

[0034] Please refer to Figure 2 The characteristic of the parallel axis power unit is that the output shaft of the motor 1 is arranged in parallel with the left rear half shaft a and the right rear half shaft b, which can reduce the space occupied by the motor 1 in the longitudinal direction of the vehicle and improve the lateral space utilization of the vehicle.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention. Such changes fall within the scope of protection of the present invention.

Claims

1. A single-motor drive system for an electric all-terrain vehicle, characterized in that: include: A rear transmission case assembly (A) comprising a motor (1), a rear reduction gear set and a rear differential (3) connected in sequence, wherein the rear differential (3) is connected to a left rear half shaft (a) and a right rear half shaft (b), the rear differential (3) is provided with a rear differential lock (4), and a two-to-four-wheel drive conversion device (5) is mounted on one of the gear shafts of the rear reduction gear set; A front transmission case assembly (B), comprising a front reduction gear set and a front differential (9) connected in a power connection, wherein the front differential (9) is connected to a left front half-shaft (c) and a right front half-shaft (d), and the front differential (9) is provided with a front differential lock (6); and a transmission shaft (7), one end of the transmission shaft (7) being connected to the two-four-wheel drive conversion device (5), and the other end being connected to one of the gear shafts of the front reduction gear set, so that the power of the motor (1) can be transmitted to the front transmission box assembly (B) via the transmission shaft (7) by switching the two-four-wheel drive conversion device (5); The rear reduction gear set comprises a first gear, a second gear, a third gear, a fourth gear and a fifth gear which are connected in sequence with power, the first gear, the second gear and the third gear are meshed in sequence, the number of teeth of the third gear is greater than the number of teeth of the second gear, the number of teeth of the second gear is greater than the number of teeth of the first gear, the third gear and the fourth gear are fixed on the same gear shaft, the two-four-wheel drive conversion device (5) is connected to the gear shaft, the fifth gear is connected to the rear differential with power, the fourth gear is meshed with the fifth gear, and the number of teeth of the fifth gear is greater than the number of teeth of the fourth gear.

2. The electric all-terrain vehicle single-motor drive system according to claim 1, characterized in that: The output shaft of the motor (1) is parallel to or perpendicular to the left rear half shaft (a).

3. The electric all-terrain vehicle single-motor drive system according to claim 1, characterized in that: The front reduction gear set includes a sixth gear (Z6) and a seventh gear (Z7) that are meshed with each other, the gear shaft of the sixth gear (Z6) is connected to the transmission shaft (7), and the seventh gear (Z7) is power-connected to the front differential (9); the sixth gear (Z6) and the fourth gear (Z4) have the same number of teeth, and the seventh gear (Z7) and the fifth gear (Z5) have the same number of teeth.

4. The electric all-terrain vehicle single-motor drive system according to claim 1, characterized in that: The transmission shaft (7) consists of three sections, and two adjacent sections are connected via a universal joint (7a).

5. The electric all-terrain vehicle single-motor drive system according to claim 1, characterized in that: The motor (1) is a liquid-cooled permanent magnet synchronous motor or an AC asynchronous motor.

Images