Longitudinal two-gear electric drive assembly and new energy vehicle

Abstract

A longitudinal two-gear electric drive assembly and a new energy vehicle. The longitudinal two-gear electric drive assembly comprises a drive electric motor (1) and a speed change mechanism, wherein the speed change mechanism comprises an input shaft (2), an intermediate shaft (3) and an output shaft (4). The input shaft (2) is in transmission connection with the drive electric motor (1), the output shaft (4) and the input shaft (2) are coaxially arranged, the output shaft (4) is in transmission connection with the input shaft (2) by means of a first clutch (5), the intermediate shaft (3) and the output shaft (4) are arranged in parallel, the input shaft (2) is provided with a first gear (6), the intermediate shaft (3) is provided with a second gear (7) and a third gear (8), the third gear (8) is in transmission connection with the intermediate shaft (3) by means of a second clutch (9), the output shaft (4) is provided with a fourth gear (10), the first gear (6) is in meshing transmission with the second gear (7), the third gear (8) is in meshing transmission with the fourth gear (10), and the first clutch (5) and the second clutch (9) are both electromagnetic dog clutches. The longitudinal two-gear electric drive assembly can meet various operating requirements, and has advantages such as a compact structure, a high transmission efficiency, good NVH performance and low production costs.

Description

A longitudinal two-speed electric drive assembly and new energy vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on July 18, 2023, with application number 202321892957.2 and application name “A longitudinal two-speed electric drive assembly and new energy vehicle”, all contents of which are incorporated by reference into this application. Technical Field

[0003] The present application belongs to the field of new energy vehicle technology, and in particular relates to a longitudinal two-speed electric drive assembly and a new energy vehicle. Background Art

[0004] The drive assembly of new energy vehicles is generally composed of a motor and a reducer. The motor first converts electrical energy into mechanical energy to provide power for the vehicle, and then the reducer reduces the speed of the motor and amplifies the output torque of the motor to achieve the effect of deceleration and torque increase, so that the drive assembly can operate within a certain speed range and a certain driving torque.

[0005] At present, the drive assemblies in new energy vehicles are mostly driven by direct motor drive or two-stage reduction. As a result, the vehicle can only achieve direct drive or power output with one reduction ratio when driving on different road sections (such as flat roads and uphill), and cannot meet both high-speed conditions and high-torque climbing conditions. If a high-power motor is used to achieve high speed and high torque output, the production cost of the drive assembly will increase, and it will also bring about NVH (Noise, Vibration, Harshness) problems.

[0006] Application Contents

[0007] In response to the above problems, the present application discloses a longitudinally mounted two-speed electric drive assembly and a new energy vehicle to overcome the above problems or at least partially solve the above problems.

[0008] In order to achieve the above objectives, this application adopts the following technical solutions:

[0009] On one hand, the present application provides a longitudinally mounted two-speed electric drive assembly, comprising a drive motor and a speed change mechanism;

[0010] The transmission mechanism includes an input shaft, an intermediate shaft, and an output shaft, wherein the input shaft is in transmission connection with the drive motor, the output shaft and the input shaft are coaxially arranged, and the output shaft and the input shaft are in transmission connection via a first clutch, the intermediate shaft and the output shaft are arranged in parallel, a first gear is provided on the input shaft, a second gear and a third gear are provided on the intermediate shaft, the third gear and the intermediate shaft are in transmission connection via a second clutch, a fourth gear is provided on the output shaft, the first gear and the second gear are meshed for transmission, and the third gear and the fourth gear are meshed for transmission;

[0011] Wherein, the first clutch and the second clutch are both electromagnetic tooth clutches.

[0012] Furthermore, the input shaft and the output shaft are connected via a bearing.

[0013] Furthermore, a first output flange is provided on the output shaft.

[0014] Further, the first clutch includes a first fixed end face tooth and a first movable end face tooth;

[0015] The first fixed end face tooth is fixedly connected to the input shaft, and the first movable end face tooth is connected to the output shaft via a spline.

[0016] Further, the second clutch includes a second fixed end face tooth and a second movable end face tooth;

[0017] The second fixed end face tooth is fixedly connected to the third gear, and the second movable end face tooth is connected to the intermediate shaft via a spline.

[0018] Furthermore, it also includes a power take-off mechanism;

[0019] The power take-off mechanism is connected to the intermediate shaft through a third clutch and is used to draw out the power of the drive motor.

[0020] Furthermore, the power take-off mechanism includes a power take-off input shaft and a power take-off output shaft;

[0021] The power take-off input shaft and the intermediate shaft are coaxially arranged, and are connected to each other through the third clutch. The power take-off output shaft and the power take-off input shaft are arranged in parallel. The power take-off input shaft is provided with a fifth gear, and the power take-off output shaft is provided with a sixth gear. The fifth gear and the sixth gear are engaged for transmission.

[0022] Furthermore, a second output flange is provided on the power take-off output shaft.

[0023] Furthermore, the rotor shaft of the drive motor and the input shaft adopt an integrated structure.

[0024] On the other hand, the present application provides a new energy vehicle, which adopts the longitudinal two-speed electric drive assembly described above.

[0025] The advantages and beneficial effects of this application are:

[0026] In the longitudinal two-speed electric drive assembly of the present application, by setting an intermediate shaft parallel to the input shaft and an output shaft set coaxially with the input shaft, the longitudinal two-speed electric drive assembly can not only realize high-speed direct drive of the motor, but also decelerate and increase torque to achieve high torque output, meet the needs of various working conditions, and enable the entire vehicle to work efficiently under various working conditions. It has the advantages of compact structure, high transmission efficiency, good NVH performance and low production cost; in addition, the longitudinal two-speed electric drive assembly adopts an electromagnetic gear clutch, which makes gear shifting smoother, gear shifting response faster and transmission more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0028] FIG1 is a schematic structural diagram of a longitudinally mounted two-speed electric drive assembly in one embodiment of the present application;

[0029] FIG2 is a characteristic curve diagram of torque-speed output by a longitudinally mounted two-speed electric drive assembly according to one embodiment of the present application;

[0030] FIG3 is a torque-vehicle speed coverage diagram of a new energy vehicle in one embodiment of the present application.

[0031] In the figure: 1. Drive motor; 2. Input shaft; 3. Intermediate shaft; 4. Output shaft; 5. First clutch; 5-1. First fixed end face gear; 5-2. First movable end face gear; 6. First gear; 7. Second gear; 8. Third gear; 9. Second clutch; 9-1. Second fixed end face gear; 9-2. Second movable end face gear; 10. Fourth gear; 11. Bearing; 12. First output flange; 13. Power take-off input shaft; 14. Power take-off output shaft; 15. Fifth gear; 16. Sixth gear; 17. Second output flange; 18. Third clutch. Specific embodiments

[0032] To make the purpose, technical solutions, and advantages of this application more clear, the following will provide a clear and complete description of the technical solutions of this application in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] The following describes in detail the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0034] In one embodiment of the present application, a longitudinal two-speed electric drive assembly is disclosed. As shown in FIG1 , the longitudinal two-speed electric drive assembly includes a drive motor 1 and a speed change mechanism.

[0035] Specifically, the speed change mechanism includes an input shaft 2, an intermediate shaft 3 and an output shaft 4. The input shaft 2 is connected to the drive motor 1, the output shaft 4 and the input shaft 2 are coaxially arranged, and the output shaft 4 and the input shaft 2 are connected to each other through a first clutch 5. The intermediate shaft 3 and the output shaft 4 are arranged in parallel. A first gear 6 is provided on the input shaft 2, a second gear 7 and a third gear 8 are provided on the intermediate shaft 3, and the third gear 8 and the intermediate shaft 3 are connected to each other through a second clutch 9. A fourth gear 10 is provided on the output shaft 4, and the first gear 6 and the second gear 7 are meshed for transmission, and the third gear 8 and the fourth gear 10 are meshed for transmission.

[0036] Among them, the first clutch 5 and the second clutch 9 are both electromagnetic tooth clutches. The electromagnetic tooth clutch can transmit a torque greater than 2000 N·m in a limited space and can withstand the impact of inaccurate speed difference of synchronization, thereby reducing the speed synchronization requirement during the speed change process and saving speed regulation time under conditions of large speed ratio difference and large speed regulation range.

[0037] The working process of the longitudinal two-speed electric drive assembly in this embodiment is specifically as follows:

[0038] The process of achieving the first gear (low gear) is as follows: the first clutch 5 is controlled to be disengaged and the second clutch 9 is controlled to be engaged. At this time, the power generated by the drive motor 1 is transmitted to the first gear 6 through the input shaft 2, and the first gear 6 and the second gear 7 are engaged to transmit the power to the intermediate shaft 3, thereby realizing a first-stage deceleration; then the intermediate shaft 3 drives the third gear 8 to rotate through the second clutch 9, and the third gear 8 and the fourth gear 10 are engaged to transmit the power to the output shaft 4, thereby realizing a second-stage deceleration, so that the longitudinal two-speed electric drive assembly can output a high-torque and low-speed driving force, which is used for vehicle starting or uphill working conditions.

[0039] The second gear (high gear) implementation process: control the first clutch 5 to engage, and control the second clutch 9 to disengage. At this time, the power generated by the drive motor 1 is transmitted to the input shaft 2, and the input shaft 2 drives the output shaft 4 to rotate through the first clutch 5, realizing direct drive of the drive motor 1, providing high-speed and low-torque driving force for the entire vehicle, meeting the normal driving needs of the entire vehicle.

[0040] As can be seen from FIG. 2 , the longitudinal two-speed electric drive assembly of this embodiment can output power with high torque and low speed in first gear; and can output power with low torque and high speed in second gear.

[0041] In summary, in the longitudinal two-speed electric drive assembly of this embodiment, by setting an intermediate shaft parallel to the input shaft and an output shaft set coaxially with the input shaft, the longitudinal two-speed electric drive assembly can not only realize high-speed direct drive of the motor, but also reduce speed and increase torque to achieve high torque output, meet the needs of various working conditions, and enable the entire vehicle to operate efficiently under various working conditions. It has the advantages of compact structure, high transmission efficiency, good NVH performance and low production cost; in addition, the longitudinal two-speed electric drive assembly adopts an electromagnetic tooth clutch, which makes gear shifting smoother, gear shifting response faster, and transmission more stable.

[0042] In this embodiment, as shown in FIG. 1 , the input shaft 2 and the output shaft 4 are connected via a bearing 11 , so that the input shaft 2 and the output shaft 4 are better coaxial and rotate more stably.

[0043] In addition, a first output flange 12 is provided on the output shaft 4, so that the longitudinal two-speed electric drive assembly can transmit power to the axle drive shaft through the first output flange 12, thereby providing driving force for the entire vehicle.

[0044] In addition, the first clutch 5 includes a first fixed end face tooth 5 - 1 and a first movable end face tooth 5 - 2 .

[0045] Among them, the first fixed end face tooth 5-1 is fixedly connected to the input shaft 2, and the first movable end face tooth 5-2 is connected to the output shaft 4 through a spline; in this way, when the first fixed end face tooth 5-1 and the first movable end face tooth 5-2 are engaged, the input shaft 2 can drive the output shaft 4 to rotate and transmit power to the output shaft 4.

[0046] Furthermore, the second clutch 9 includes a second fixed end face tooth 9 - 1 and a second movable end face tooth 9 - 2 .

[0047] Among them, the second fixed end face tooth 9-1 is fixedly connected to the third gear 8, and the second movable end face tooth 9-2 is connected to the intermediate shaft 3 through a spline; in this way, when the second fixed end face tooth 9-1 and the second movable end face tooth 9-2 are engaged, the intermediate shaft 3 can drive the third gear 8 to rotate and transmit power to the third gear 8.

[0048] In this embodiment, as shown in FIG1 , the longitudinal two-speed electric drive assembly further includes a power take-off mechanism.

[0049] Among them, the power take-off mechanism is connected to the intermediate shaft 3 through the third clutch 18, which is used to draw out the power of the drive motor and transmit it to other systems of the vehicle that require power, such as the mixing system of the mixer truck, the cleaning system of the automatic sweeper, etc.

[0050] It should be noted that, since the first gear 6 is fixedly connected to the input shaft 2, the third gear 8 is fixedly connected to the intermediate shaft 3, and the first gear 6 and the third gear 8 are in transmission, when the drive motor 1 rotates, regardless of whether the longitudinal two-speed electric drive assembly is in first gear or second gear, or in neutral, the drive motor 1 will drive the intermediate shaft 3 to rotate; in this way, the intermediate shaft 3 can draw out power through the power take-off mechanism, and the output of the power take-off mechanism will not affect the normal driving force output of the longitudinal two-speed electric drive assembly.

[0051] Specifically, the power take-off mechanism includes a power take-off input shaft 13 and a power take-off output shaft 14 , and power output is performed through the power take-off output shaft 14 .

[0052] The PTO input shaft 13 and the intermediate shaft 3 are coaxially arranged and connected via a third clutch 18. The third clutch 18 controls the on / off transmission of power between the PTO mechanism and the intermediate shaft 3. Specifically, when the PTO mechanism does not require power, the third clutch 18 can be disengaged. The PTO output shaft 14 is arranged parallel to the PTO input shaft 13. A fifth gear 15 is provided on the PTO input shaft 13, and a sixth gear 16 is provided on the PTO output shaft 14. The fifth and sixth gears 16 mesh with each other. Thus, when the third clutch 18 is engaged, the intermediate shaft 3 drives the PTO input shaft 13 to rotate via the third clutch 18. This in turn drives the fifth gear 15 to rotate. The meshing of the fifth and sixth gears 15 and 16 transfers power to the PTO output shaft 14, thereby achieving power output from the PTO mechanism.

[0053] In addition, a second output flange 17 is provided on the power take-off output shaft 14 , and the power take-off mechanism can transmit power to other systems of the vehicle that require power through the second output flange 17 .

[0054] In addition, the rotor shaft of the drive motor and the input shaft of the speed change mechanism adopt an integrated structure. This can reduce the impact of the rotor shaft of the drive motor on the speed change mechanism during power transmission and reduce transmission losses. In other embodiments of the present application, the rotor shaft of the drive motor can also be connected to the input shaft of the speed change mechanism via a coupling.

[0055] In another embodiment of the present application, a new energy vehicle is disclosed, which adopts the longitudinal two-speed electric drive assembly in the above embodiment; as shown in Figure 3, the torque-vehicle speed coverage range of the new energy vehicle in the first and second gears is wider than the coverage range of the traditional direct drive, and can meet the needs of different working conditions.

[0056] The above description is only a specific embodiment of the present application. Based on the above teachings of the present application, those skilled in the art may make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above description is only a better explanation of the purpose of the present application, and the scope of protection of the present application shall be based on the scope of protection of the claims.

Claims

1. A longitudinal two-speed electric drive assembly, characterized in that: It includes a driving motor and a speed changing mechanism; The speed change mechanism comprises an input shaft, an intermediate shaft and an output shaft, wherein the input shaft is in transmission connection with the drive motor, the output shaft is coaxially arranged with the input shaft, and the output shaft is in transmission connection with the input shaft via a first clutch, the intermediate shaft and the output shaft are arranged in parallel, a first gear is arranged on the input shaft, a second gear and a third gear are arranged on the intermediate shaft, the third gear and the intermediate shaft are in transmission connection with each other via a second clutch, a fourth gear is arranged on the output shaft, the first gear and the second gear are meshed for transmission, and the third gear and the fourth gear are meshed for transmission; Wherein, the first clutch and the second clutch are both electromagnetic tooth clutches.

2. The longitudinal two-speed electric drive assembly according to claim 1, characterized in that: The input shaft and the output shaft are connected via a bearing.

3. The longitudinal two-speed electric drive assembly according to claim 1, characterized in that: The output shaft is provided with a first output flange.

4. The longitudinal two-speed electric drive assembly according to claim 1, characterized in that: The first clutch comprises a first fixed end face tooth and a first movable end face tooth; The first fixed end face tooth is fixedly connected to the input shaft, and the first movable end face tooth is connected to the output shaft via a spline.

5. The longitudinal two-speed electric drive assembly according to claim 1, characterized in that: The second clutch comprises a second fixed end face tooth and a second movable end face tooth; The second fixed end face tooth is fixedly connected to the third gear, and the second movable end face tooth is connected to the intermediate shaft via a spline.

6. The longitudinal two-speed electric drive assembly according to claim 1, characterized in that: It also includes a power take-off mechanism; The power take-off mechanism is connected to the intermediate shaft through a third clutch and is used to lead out the power of the drive motor.

7. The longitudinal two-speed electric drive assembly according to claim 6, characterized in that: The power take-off mechanism comprises a power take-off input shaft and a power take-off output shaft; The power take-off input shaft and the intermediate shaft are coaxially arranged, and the power take-off input shaft and the intermediate shaft are transmission connected via the third clutch. The power take-off output shaft and the power take-off input shaft are arranged in parallel. The power take-off input shaft is provided with a fifth gear, and the power take-off output shaft is provided with a sixth gear. The fifth gear and the sixth gear are meshed for transmission.

8. The longitudinal two-speed electric drive assembly according to claim 7, characterized in that: The power take-off output shaft is provided with a second output flange.

9. The longitudinal two-speed electric drive assembly according to any one of claims 1 to 8, characterized in that: The rotor shaft of the driving motor and the input shaft adopt an integrated structure.

10. A new energy vehicle, characterized in that: The new energy vehicle adopts the longitudinal two-speed electric drive assembly described in any one of claims 1 to 9.

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