Driving system and automobile

Abstract

The present application relates to a driving system and an automobile. The driving system comprises an intermediate shaft, a first motor, a second motor, a first output shaft, and a second output shaft; a first double gear and a second double gear are sleeved on the intermediate shaft in a free manner; the first motor is connected to the first double gear; the second motor is connected to the second double gear; the first output shaft is connected to the first double gear; and the second output shaft is connected to the second double gear. According to the present application, a first double gear and a second double gear are sleeved on a same intermediate shaft in a free manner, so that the first double gear and the second double gear can rotate relative to the intermediate shaft, and the first double gear and the second double gear do not affect each other, and thus independent driving of the wheels on two sides of the automobile is conveniently realized by means of two motors. Compared with the prior art, the number of shafts and the number of gears are reduced, so that the number of parts can be reduced, the manufacturing costs of the driving system and the automobile are reduced, and the axial length and the occupied space of the intermediate shaft are reduced, and thus spatial arrangement of all parts in the driving system is facilitated.

Description

Drive system and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on January 11, 2024, with application number 202420072993.2 and invention name “A drive system and automobile”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of motor drive technology, and in particular to a drive system and a vehicle. Background Art

[0004] Exhaust emissions from fuel-powered vehicles pollute the environment and deteriorate air quality. As countries around the world tighten fuel consumption and emissions standards while offering substantial policy incentives for new energy vehicles, new energy vehicles are rapidly developing and becoming increasingly popular. Dual-motor vehicles, with their superior efficiency and power, have become a new development trend in the automotive industry.

[0005] The dual-motor power transmission devices currently installed in mass-produced new energy vehicles usually have two sets of transmission components in order to achieve independent drive of the left and right wheels through the dual motors. Each set of transmission components includes an input shaft, an intermediate shaft and an output shaft. As a result, the dual-motor power transmission device includes at least 6 shafts, 8 transmission gears (each intermediate shaft is equipped with two transmission gears for achieving reduction transmission) and 12 bearings. The large number of components is not only not conducive to the spatial arrangement of components, but also causes an increase in the cost of the drive system and vehicle manufacturing. Summary of the Invention

[0006] One of the purposes of this application is to provide a drive system to solve the problem that the dual-motor power transmission device in the prior art has a large number of components, which is not conducive to the spatial arrangement of components and has high manufacturing costs; the second purpose is to provide a car.

[0007] In order to achieve the above objectives, the technical solutions adopted in this application are as follows:

[0008] A drive system comprising:

[0009] An intermediate shaft, wherein an idler sleeve of the intermediate shaft is provided with a first duplex gear and a second duplex gear;

[0010] a first motor connected to the first double gear;

[0011] a second motor connected to the second double gear;

[0012] a first output shaft connected to the first duplex gear;

[0013] A second output shaft is connected to the second dual gear.

[0014] According to the above technical approach, by placing two duplex gear idlers on the same intermediate shaft, and using the first and second motors to drive the first and second duplex gears to rotate relative to the intermediate shaft, the number of intermediate shafts, keys, and other components is reduced, while still independently driving the left and right wheels through the rotation of the first and second duplex gears relative to the intermediate shaft. This facilitates the layout of components in the intermediate shaft area and reduces drive system and vehicle manufacturing costs.

[0015] Optionally, the drive system further includes a first bearing, and the first duplex gear or the second duplex gear is disposed on the intermediate shaft through an idler sleeve of the first bearing.

[0016] According to the above technical means, the first duplex gear or the second duplex gear can rotate more smoothly relative to the intermediate shaft, which is beneficial to reducing the friction between the first duplex gear or the second duplex gear and the intermediate shaft. The movement of the first duplex gear or the second duplex gear in the radial or axial direction can be controlled so that the first duplex gear or the second duplex gear can only rotate relative to the intermediate shaft, thereby avoiding transmission failure caused by the first duplex gear or the second duplex gear moving in the radial or axial direction and being unable to maintain the correct position.

[0017] Optionally, the first bearing is a needle roller bearing.

[0018] According to the above technical means, since the radial size of the needle roller bearing is small, it is suitable for being embedded inside the first double gear and the second double gear for transmission, so that the connection between the first double gear or the second double gear and the intermediate shaft is compact, and a larger load-bearing capacity can be provided in a smaller installation space.

[0019] Optionally, second bearings are provided at both ends of the intermediate shaft, and the first duplex gear and the second duplex gear are located between the two second bearings.

[0020] According to the above technical solution, the intermediate shaft and the first and second duplex gears mounted on the intermediate shaft are supported by two second bearings. If the first or second duplex gears become stuck on the intermediate shaft due to a malfunction, the intermediate shaft can rotate via the second bearings, thus preventing the intermediate shaft from breaking due to the high torque applied to it.

[0021] Optionally, the second bearing is a tapered roller bearing.

[0022] According to the above technical means, tapered roller bearings are arranged at both ends of the intermediate shaft, which can withstand heavier radial loads and axial loads, compensate for errors caused by non-concentricity and shaft deflection, and limit the axial displacement or tilt of the intermediate shaft, so that the intermediate shaft and the second bearing can move more smoothly during the transmission process.

[0023] Optionally, the first dual gear and the second dual gear are symmetrically arranged on the intermediate shaft, and the first dual gear and the second dual gear each have a large diameter gear and a small diameter gear, the large diameter gear is used to connect to the first motor or the second motor, and the small diameter gear is used to connect to the first output shaft or the second output shaft.

[0024] According to the above technical means, reduction transmission can be achieved through gears of different diameters on the duplex gears. Since the large-diameter gears and small-diameter gears on the duplex gears are an integral structure, the difficulty of assembling the gears on the intermediate shaft can be reduced.

[0025] Optionally, the drive system further comprises a first input shaft and a first transmission gear coaxially arranged, the first motor is connected to the first input shaft, and the first transmission gear is meshed with the first double gear;

[0026] The drive system further includes a second input shaft and a second transmission gear that are coaxially arranged, the second motor is connected to the second input shaft, and the second transmission gear is meshed with the second duplex gear.

[0027] According to the above technical means, the power of the first motor and the second motor can be transmitted to the first double gear and the second double gear respectively.

[0028] Optionally, a third bearing is provided on each of the first input shaft, the second input shaft, the first output shaft and the second output shaft.

[0029] According to the above technical means, the rotation of each shaft can be made more stable.

[0030] Optionally, the drive system further comprises a third transmission gear coaxially arranged with the first output shaft, the third transmission gear being meshed with the first duplex gear;

[0031] The drive system further includes a fourth transmission gear coaxially arranged with the second output shaft, and the fourth transmission gear is meshed with the second double gear.

[0032] According to the above technical means, the power on the first duplex gear and the second duplex gear can be transmitted to the first output shaft and the second output shaft respectively, thereby driving the wheels on both sides of the vehicle respectively.

[0033] An automobile comprises the above-mentioned drive system.

[0034] According to the above technical means, the first output shaft in the drive system is connected to the wheel on one side of the car, and the second output shaft is connected to the wheel on the other side of the car. Through two independent power transmission paths, independent driving of the wheels on both sides of the car can be achieved.

[0035] Beneficial effects of this application:

[0036] (1) By loosely fitting the first duplex gear and the second duplex gear on the same intermediate shaft, the first duplex gear and the second duplex gear can both rotate relative to the intermediate shaft without affecting each other, thereby facilitating independent driving of the wheels on both sides of the vehicle by dual motors. Compared with the prior art, the existing dual-motor drive system includes at least 6 shafts, 8 transmission gears and 12 bearings, while the drive system of the present application can reduce the number of components to 5 shafts, 6 gears and 12 bearings. The number of shafts and gears is reduced, which can reduce the number of components, reduce the manufacturing cost of the drive system and the vehicle, reduce the axial length of the intermediate shaft and the occupied space, and facilitate the spatial arrangement of the components in the drive system.

[0037] (2) The present application arranges the needle bearing between the duplex gear and the intermediate shaft, which can make the connection between the first duplex gear or the second duplex gear and the intermediate shaft compact, and can provide a larger load bearing capacity in a smaller installation space.

[0038] (3) The present application uses tapered roller bearings to support the first input shaft, the second input shaft, the intermediate shaft, the first output shaft, and the second output shaft, which can withstand heavier radial loads and axial loads, compensate for errors caused by eccentricity and shaft deflection, and limit the axial displacement or tilt of each shaft, so that each shaft can move more smoothly during the transmission process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] FIG1 is a schematic structural diagram of a drive system provided in an embodiment of the present application;

[0040] FIG2 is a schematic structural diagram of a first duplex gear and a second duplex gear provided in an embodiment of the present application;

[0041] FIG3 is a schematic diagram of the working mode of the drive system provided in an embodiment of the present application, and the direction indicated by the arrow in the figure is the direction of power transmission.

[0042] Among them, 1-intermediate shaft; 2-first duplex gear; 201-first large diameter gear; 202-first small diameter gear; 3-second duplex gear; 301-second large diameter gear; 302-second small diameter gear; 4-first motor; 5-second motor; 6-first output shaft; 7-second output shaft; 8-first bearing; 9-second bearing; 10-first input shaft; 11-first transmission gear; 12-second input shaft; 13-second transmission gear; 14-third bearing; 15-third transmission gear; 16-fourth transmission gear. DETAILED DESCRIPTION

[0043] The following will describe the embodiments of the present application with reference to the accompanying drawings and optional embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the optional embodiments are only for the purpose of illustrating the present application and are not intended to limit the scope of protection of the present application.

[0044] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. Therefore, the illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0045] Referring to Figures 1 to 3, this embodiment provides a drive system comprising an intermediate shaft 1, a first motor 4, a second motor 5, a first output shaft 6, and a second output shaft 7. A first duplex gear 2 and a second duplex gear 3 are loosely mounted on the intermediate shaft 1, allowing the first duplex gear 2 and the second duplex gear 3 to rotate relative to the intermediate shaft 1, thereby ensuring that the first and second duplex gears 2 and 3 do not affect each other. The first motor 4 is connected to the first duplex gear 2 to drive the first duplex gear 2 to rotate. The second motor 5 is connected to the second duplex gear 3 to drive the second duplex gear 3 to rotate. The first output shaft 6 is connected to the first duplex gear 2 to transmit the power output of the first motor 4 to the first output shaft 6 via the first duplex gear 2, thereby driving the wheels on one side to rotate. The second output shaft 7 is connected to the second duplex gear 3 to transmit the power output of the second motor 5 to the second output shaft 7 via the second duplex gear 3, thereby driving the wheels on the other side to rotate.

[0046] It should be noted that in the prior art, to achieve independent drive of both wheels, two intermediate shafts are typically provided to transmit power to the left and right output shafts. At least two gears of different diameters are mounted on the intermediate shafts, and the two gears are fixedly connected to the intermediate shafts via a key to prevent the gears from rotating relative to the intermediate shafts. This allows the gears connected to the motors to drive the intermediate shafts and another gear to rotate synchronously. Bearings are required at both ends of each intermediate shaft for support, resulting in a large number of components and a large axial dimension in the intermediate shaft mounting area. In the present application, two duplex gear idlers are positioned on the same intermediate shaft 1, with the first and second motors 4 and 5 driving the first and second duplex gears 2 and 3 to rotate relative to the intermediate shaft 1, respectively. This reduces the number of intermediate shafts, keys, and bearings, while still achieving independent drive of the left and right wheels through the rotation of the first and second duplex gears 2 and 3 relative to the intermediate shaft 1. This facilitates component layout in the intermediate shaft 1 mounting area and reduces drive system and vehicle manufacturing costs.

[0047] In some embodiments of the present application, referring to Figure 1, the drive system also includes a first bearing 8, and the first duplex gear 2 or the second duplex gear 3 is set on the intermediate shaft 1 through the first bearing 8, so that the first duplex gear 2 or the second duplex gear 3 can rotate more smoothly relative to the intermediate shaft 1, which is beneficial to reducing the friction between the first duplex gear 2 or the second duplex gear 3 and the intermediate shaft 1, and can control the movement of the first duplex gear 2 or the second duplex gear 3 in the radial or axial direction, so that the first duplex gear 2 or the second duplex gear 3 can only rotate relative to the intermediate shaft 1, avoiding transmission failure due to the first duplex gear 2 or the second duplex gear 3 moving in the radial or axial direction and being unable to maintain the correct position.

[0048] In some optional embodiments of the present application, the first bearing 8 is a needle roller bearing. Needle roller bearings generally use high-precision cylindrical or tapered needle rollers as rolling elements. They have a small radial dimension and are suitable for being embedded in the first duplex gear 2 and the second duplex gear 3 for transmission. This makes the connection between the first duplex gear 2 or the second duplex gear 3 and the intermediate shaft 1 compact, providing a large load-bearing capacity within a small installation space.

[0049] In the above embodiment, power is transmitted directly between the motor and the output shaft through the first duplex gear 2 and the second duplex gear 3. Whether the intermediate shaft 1 rotates has no effect on the final speed of the output shaft. Therefore, the supports at both ends of the intermediate shaft 1 can be set in either fixed supports or bearings.

[0050] In some embodiments of the present application, referring to FIG. 1 , second bearings 9 are provided at both ends of the intermediate shaft 1. The first duplex gear 2 and the second duplex gear 3 are positioned between the two second bearings 9. The two second bearings 9 support the intermediate shaft 1 and the first duplex gear 2 and the second duplex gear 3 disposed thereon. If the first duplex gear 2 or the second duplex gear 3 becomes stuck on the intermediate shaft 1 due to a malfunction, the intermediate shaft 1 can rotate via the second bearings 9, thereby preventing the intermediate shaft 1 from breaking due to the high torque applied to the intermediate shaft 1 in the event of a malfunction.

[0051] In some optional embodiments of the present application, the second bearing 9 is a tapered roller bearing. Placing the tapered roller bearings at both ends of the intermediate shaft 1 can withstand heavier radial and axial loads, compensate for errors caused by misalignment and shaft deflection, and limit axial displacement or tilt of the intermediate shaft 1, thereby ensuring smoother movement of the intermediate shaft 1 and the second bearing 9 during transmission.

[0052] In the above embodiment, since the speed of the first motor 4 or the second motor 5 when directly outputting power is relatively high, it is necessary to reduce the output shaft through a gear assembly. In the prior art, gears of different diameters are usually arranged on the intermediate shaft 1 to achieve reduction transmission. There are many parts and components, and it is difficult to ensure the assembly accuracy between the two gears.

[0053] To address the aforementioned issues, in some embodiments of the present application, the first duplex gear 2 and the second duplex gear 3 are symmetrically arranged on the intermediate shaft 1. Each of the first and second duplex gears 2 and 3 comprises a large-diameter gear and a small-diameter gear. The large-diameter gear is used to connect to the first motor 4 or the second motor 5, while the small-diameter gear is used to connect to the first output shaft 6 or the second output shaft 7. This utilizes the difference in gear volume to achieve speed reduction. Because the large-diameter and small-diameter gears on the duplex gears are integrally constructed, assembly of the gears on the intermediate shaft 1 is simplified. Specifically, referring to FIG. 2 , the first duplex gear 2 comprises a first large-diameter gear 201 and a first small-diameter gear 202. The first large-diameter gear 201 is used to connect to the first motor 4, while the first small-diameter gear 202 is used to connect to the first output shaft 6. The second duplex gear 3 comprises a second large-diameter gear 301 and a second small-diameter gear 302. The second large-diameter gear 301 is used to connect to the second motor 5, while the second small-diameter gear 302 is used to connect to the second output shaft 7. This reduces the speed transmitted to the first and second output shafts 6 and 7 to a reasonable vehicle speed range.

[0054] In order to transmit the power of the first motor 4 to the first duplex gear 2, in some embodiments of the present application, please refer to Figure 1, the drive system also includes a coaxially arranged first input shaft 10 and a first transmission gear 11, the first motor 4 is connected to the first input shaft 10, and the first transmission gear 11 is engaged with the first duplex gear 2, and power transmission is achieved through gear engagement. Specifically, the first transmission gear 11 is engaged with the first large diameter gear 201.

[0055] In order to transmit the power of the second motor 5 to the second duplex gear 3, the drive system also includes a coaxially arranged second input shaft 12 and a second transmission gear 13. The second motor 5 is connected to the second input shaft 12, and the second transmission gear 13 is engaged with the second duplex gear 3. Power transmission is achieved through gear engagement. Specifically, the second transmission gear 13 is engaged with the second large-diameter gear 301.

[0056] Because the first input shaft 10, the second input shaft 12, the first output shaft 6, and the second output shaft 7 in the drive system all need to rotate to achieve power transmission, in order to make the rotation of each shaft more stable, in some embodiments of the present application, a third bearing 14 is provided on the first input shaft 10, the second input shaft 12, the first output shaft 6, and the second output shaft 7. Optionally, the third bearing 14 is a tapered roller bearing, and the specifications and quantity of the tapered roller bearings provided on each shaft can be selected according to the size of the respective shaft.

[0057] In order to transmit the power on the first duplex gear 2 to the first output shaft 6, in some embodiments of the present application, please refer to Figure 1, the drive system also includes a third transmission gear 15 coaxially arranged with the first output shaft 6, and the third transmission gear 15 is engaged with the first duplex gear 2, and power transmission is achieved through gear engagement. Specifically, the third transmission gear 15 is engaged with the first small-diameter gear 202.

[0058] In order to transmit the power on the second dual gear 3 to the second output shaft 7, the drive system also includes a fourth transmission gear 16 coaxially arranged with the second output shaft 7. The fourth transmission gear 16 is engaged with the second dual gear 3, and power transmission is achieved through gear engagement. Specifically, the fourth transmission gear 16 is engaged with the second small-diameter gear 302.

[0059] In order to achieve stable support for the first transmission gear 11, the second transmission gear 13, the third transmission gear 15 and the fourth transmission gear 16, third bearings 14 are provided on the shafts on both sides of the above gears to achieve synchronous and smooth rotation of the coaxially arranged shafts and gears.

[0060] Compared with the existing technology, the existing dual-motor drive system includes at least 6 shafts, 8 transmission gears and 12 bearings, while the drive system of the present application can reduce the components to 5 shafts, 6 gears and 12 bearings. The number of shafts and gears has been reduced, which can reduce the number of components, reduce the manufacturing cost of the drive system and automobile, reduce the axial length and occupied space of the intermediate shaft 1, and facilitate the spatial arrangement of various components in the drive system.

[0061] The drive system of the present application has a symmetrical structure and has two independent power transmission paths, namely the first motor power path and the second motor power path, as shown in Figure 3. The first motor power path is: first motor 4 - first input shaft 10 - first transmission gear 11 - first large diameter gear 201 - first small diameter gear 202 - third transmission gear 15 - first output shaft 6.

[0062] The power path of the second motor is: second motor 5 - second input shaft 12 - second transmission gear 13 - second large-diameter gear 301 - second small-diameter gear 302 - fourth transmission gear 16 - second output shaft 7 .

[0063] The present application also provides an automobile, including the drive system described in the above embodiment. In the drive system, a first output shaft 6 is connected to a wheel on one side of the automobile, and a second output shaft 7 is connected to a wheel on the other side of the automobile, thereby independently driving the wheels on both sides of the automobile.

[0064] Referring to FIG. 1 to FIG. 3 , in some embodiments of the present application, the driving system operates as follows:

[0065] Step 1: Start the first motor 4 and / or the second motor 5 as needed.

[0066] Step 2: The first motor 4 and the first input shaft 10 drive the first transmission gear 11 to rotate. The first transmission gear 11 meshes with the first large-diameter gear 201, driving the first large-diameter gear 201 to rotate, causing the first duplex gear 2 to rotate as a whole relative to the intermediate shaft 1. The first small-diameter gear 202 then drives the third transmission gear 15 and the first output shaft 6 to rotate, thereby driving one wheel.

[0067] The second motor 5 and the second input shaft 12 drive the second transmission gear 13 to rotate, and the second transmission gear 13 engages with the second large-diameter gear 301, driving the second large-diameter gear 301 to rotate, so that the second duplex gear 3 rotates as a whole relative to the intermediate shaft 1, and the second small-diameter gear 302 drives the fourth transmission gear 16 and the second output shaft 7 to rotate, thereby driving the wheel on the other side; during the driving process, the first duplex gear 2 and the second duplex gear 3 do not affect each other, so the speed of the wheels on both sides can be independently controlled by adjusting the speed of the first motor 4 and the second motor 5 respectively.

[0068] Step 3: During the driving of the vehicle, the speed of the first motor 4 and / or the second motor 5 is adjusted or the corresponding motor is turned off as needed.

[0069] In the present application, the first duplex gear 2 and the second duplex gear 3 are loosely mounted on the same intermediate shaft 1, so that the first duplex gear 2 and the second duplex gear 3 can both rotate relative to the intermediate shaft 1 without affecting each other, thereby facilitating independent driving of the wheels on both sides of the vehicle by means of dual motors, reducing the number of components, lowering the manufacturing cost of the drive system and the vehicle, reducing the axial length and occupied space of the intermediate shaft 1, and facilitating the spatial arrangement of the various components in the drive system.

[0070] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art based on the present application are within the protection scope of the present application.

Claims

1. A drive system, characterized in that, Comprising: An intermediate shaft (1), on which a first double gear (2) and a second double gear (3) are sleeved loosely; A first motor (4), which is connected to the first double gear (2); A second motor (5), which is connected to the second double gear (3); A first output shaft (6), which is connected to the first double gear (2); A second output shaft (7), which is connected to the second double gear (3).

2. The drive system according to claim 1, wherein: The drive system further includes a first bearing (8), and the first double gear (2) or the second double gear (3) is sleeved loosely on the intermediate shaft (1) through the first bearing (8).

3. The drive system according to claim 2, characterized in that: The first bearing (8) is a needle bearing.

4. The drive system according to claim 1, characterized in that: Both ends of the intermediate shaft (1) are provided with second bearings (9), and the first double gear (2) and the second double gear (3) are located between the two second bearings (9).

5. The drive system according to claim 4, characterized in that: The second bearing (9) is a tapered roller bearing.

6. The drive system according to any one of claims 1 to 5, characterized in that: The first double gear (2) and the second double gear (3) are symmetrically arranged on the intermediate shaft (1). Both the first double gear (2) and the second double gear (3) have a large-diameter gear and a small-diameter gear. The large-diameter gear is used to connect to the first motor (4) or the second motor (5), and the small-diameter gear is used to connect to the first output shaft (6) or the second output shaft (7).

7. The drive system according to any one of claims 1 to 5, characterized in that: The drive system further includes a first input shaft (10) and a first transmission gear (11) arranged coaxially. The first motor (4) is connected to the first input shaft (10), and the first transmission gear (11) meshes with the first double gear (2); The drive system further includes a second input shaft (12) and a second transmission gear (13) arranged coaxially. The second motor (5) is connected to the second input shaft (12), and the second transmission gear (13) meshes with the second double gear (3).

8. The drive system according to claim 7, wherein: Third bearings (14) are provided on the first input shaft (10), the second input shaft (12), the first output shaft (6) and the second output shaft (7).

9. The drive system according to any one of claims 1 to 5, characterized in that: The drive system further includes a third transmission gear (15) arranged coaxially with the first output shaft (6), and the third transmission gear (15) meshes with the first double gear (2); The drive system further includes a fourth transmission gear (16) arranged coaxially with the second output shaft (7), and the fourth transmission gear (16) meshes with the second double gear (3).

10. A vehicle, characterized in that, Including the drive system according to any one of claims 1 to 9.

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