Dual-motor coaxial symmetric three-mode electric drive axle

Abstract

The invention discloses a dual-motor coaxial symmetric three-mode electric drive axle which comprises a left drive motor, a right drive motor, a drive axle shell, a left mode switching mechanism, a right mode switching mechanism, a centralized drive mode power transmission mechanism, an open differential mechanism, a left half shaft and a right half shaft. Three working modes including a single-motor centralized driving mode, a double-motor centralized driving mode and a double-motor distributed driving mode can be achieved, the three working modes can be switched at will, and the dynamic property, economical efficiency and active safety of the vehicle under the complex and changeable working conditions are improved.

Description

Technical Field

[0001] The invention belongs to the field of electric vehicle transmission, and in particular relates to a dual-motor coaxial symmetrical three-mode electric drive bridge. Background Art

[0002] In recent years, environmental and energy issues such as urban air pollution and the depletion of fossil energy have become increasingly prominent. The development of sustainable energy, low-carbon and environmentally friendly electric vehicles has become an effective way to solve the above problems.

[0003] At present, according to the layout of electric vehicle drive systems, electric vehicles are mainly divided into two forms: centralized drive systems and distributed drive systems. The centralized drive system has the advantages of mature and reliable technology and convenient space layout. The torque output by its power source motor is decelerated and torque-increased by the reduction mechanism, and then evenly distributed to the left and right half-axles through the open differential. The open differential can effectively solve the kinematic incoordination of the left and right wheels of the vehicle during turning. However, the characteristic that the driving torque of the wheels on both sides is always evenly distributed is not conducive to the improvement of the chassis dynamics performance of the vehicle under complex and changeable driving conditions. The distributed drive system is a new type of drive form based on the basic principle of independently controlling the driving torque of each wheel by the wheel hub\wheel side motor. It improves the chassis dynamics performance of the vehicle such as passability, maneuverability, and handling by independently controlling the driving torque of the wheels on the left and right sides. However, when the vehicle is traveling in a straight line, the motors on the left and right sides of the distributed drive system must output the same torque at the same time, which will result in low driving efficiency of the motor under conditions such as low speed and light load. Secondly, the distributed drive system requires the left and right motors to work at the same time, which increases the risk of failure. When one side of the motor fails, the vehicle cannot drive. At this time, the vehicle's fault tolerance performance is poor. Summary of the invention

[0004] In order to address the deficiencies of the prior art described in the background technology, the present invention provides a dual-motor coaxial symmetrical three-mode electric drive axle, which has three working modes: single-motor centralized drive mode, dual-motor centralized drive mode, and dual-motor distributed drive mode. The axle can switch arbitrarily between the three working modes according to the actual driving conditions of the vehicle, taking into account the respective advantages of the current distributed drive system and centralized drive system of electric vehicles, and significantly improving the comprehensive performance of the vehicle such as economy, controllability, and road passability.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] The drive axle housing supports other components;

[0007] The left driving motor is an inner rotor hollow shaft motor, which comprises: a housing 1, a stator coil 1, a hollow shaft inner rotor 1, and a hollow power output shaft 1;

[0008] The right driving motor is an inner rotor hollow shaft motor, which includes: a second housing, a second stator coil, a second hollow shaft inner rotor, and a second hollow power output shaft;

[0009] The left mode switching mechanism includes: a primary reduction driving gear 1, a primary reduction driven gear 1, an intermediate shaft 1, a distributed drive mode driving gear 1, a distributed drive mode driven gear 1, a distributed drive mode ring gear 1, a centralized drive mode ring gear 1, a spline hub 1, and a coupling sleeve 1;

[0010] The right mode switching mechanism includes: a first-stage reduction driving gear 2, a first-stage reduction driven gear 2, a second intermediate shaft, a second distributed drive mode driving gear, a second distributed drive mode driven gear, a second distributed drive mode ring gear, a second centralized drive mode ring gear, a second spline hub, and a second coupling sleeve;

[0011] A centralized drive mode power transmission mechanism, comprising: a transmission shaft, a reduction driving gear, and a reduction driven gear;

[0012] open differential;

[0013] Left half shaft;

[0014] Right half shaft.

[0015] Preferably, the first-stage reduction driving gear 1 is connected to the hollow power output shaft 1 of the left-side drive motor through a spline; the first-stage reduction driven gear 1 is connected to the intermediate shaft 1 through a spline; the left side of the intermediate shaft 1 is supported on the drive axle housing through a bearing; the distributed drive mode driving gear 1 is loosely sleeved on the intermediate shaft 1; the distributed drive mode driven gear 1 is connected to the left half-shaft through a spline; the distributed drive mode ring gear 1 is connected to the distributed drive mode driving gear 1; and the spline hub 1 is connected to the intermediate shaft 1 through a spline.

[0016] Preferably, the first-stage reduction driving gear 2 is connected to the hollow power output shaft 2 of the right-side drive motor through a spline; the first-stage reduction driven gear 2 is connected to the intermediate shaft 2 through a spline; the right side of the intermediate shaft 2 is supported on the drive axle housing through a bearing; the distributed drive mode driving gear 2 is loosely sleeved on the intermediate shaft 2; the distributed drive mode driven gear 2 is connected to the right-side half shaft through a spline; the distributed drive mode ring gear 2 is connected to the distributed drive mode driving gear 2; and the spline hub 2 is connected to the intermediate shaft 2 through a spline.

[0017] Preferably, the left end of the transmission shaft is a hollow shaft, which is loosely sleeved on the right end of the intermediate shaft 1 of the left mode switching mechanism, and the right end of the transmission shaft is a hollow shaft, which is loosely sleeved on the left end of the intermediate shaft 2 of the right mode switching mechanism; the reduction driving gear is connected to the transmission shaft through a spline; the reduction driven gear is fixedly connected to the external housing of the open differential; the centralized drive mode ring gear 1 is connected to the left hollow end of the transmission shaft through a spline; the centralized drive mode ring gear 2 is connected to the right hollow end of the transmission shaft through a spline.

[0018] Preferably, the left-side drive motor and the left-side mode switching mechanism are symmetrically arranged on the left and right sides of the open differential, respectively, with the right-side drive motor and the right-side mode switching mechanism.

[0019] Preferably, a dual-motor coaxial symmetrical three-mode electric drive bridge realizes switching between three working modes by controlling the output torque of the left drive motor and the right drive motor and the positions of the combining sleeve 1 and the combining sleeve 2; when the left drive motor outputs torque and the right drive motor does not output torque, the combining sleeve 1 is combined with the centralized drive mode ring gear 1, and the combining sleeve 2 is in the middle position, and the dual-motor coaxial symmetrical three-mode electric drive bridge works in the single-motor centralized drive mode; when the left drive motor and the right drive motor output torque at the same time, the combining sleeve 1 is combined with the centralized drive mode ring gear 1, and the combining sleeve 2 is combined with the centralized drive mode ring gear 2, and the dual-motor coaxial symmetrical three-mode electric drive bridge works in the dual-motor centralized drive mode; when the left drive motor and the right drive motor output torque at the same time, the combining sleeve 1 is combined with the distributed drive mode ring gear 1, and the combining sleeve 2 is combined with the distributed drive mode ring gear 2, and the dual-motor coaxial symmetrical three-mode electric drive bridge works in the dual-motor distributed drive mode.

[0020] The beneficial effects of the present invention are:

[0021] 1. The dual-motor coaxial symmetrical three-mode electric drive axle described in the present invention takes into account the advantages of both a centralized drive system and a distributed drive system, and can significantly improve the vehicle's comprehensive performance such as economy, controllability, and road passability by switching between different drive modes.

[0022] 2. The dual-motor coaxial symmetrical three-mode electric drive axle described in the present invention is composed only of motors and mechanical transmission mechanisms, and has the advantages of high strength, high reliability and high transmission efficiency. The motors and mode switching mechanisms are coaxially symmetrically arranged, which has the advantages of high integration and convenient vehicle layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the component assembly of a dual-motor coaxial symmetrical three-mode electric drive bridge described in the present invention.

[0025] Figure 2 This is a schematic structural diagram of a dual-motor coaxial symmetrical three-mode electric drive bridge described in the present invention.

[0026] Figure 3 A schematic diagram of torque flow when the dual-motor coaxial symmetrical three-mode electric drive bridge described in the present invention operates in a single-motor centralized drive mode.

[0027] Figure 4 A schematic diagram of torque flow when a dual-motor coaxial symmetrical three-mode electric drive bridge according to the present invention operates in a dual-motor centralized drive mode.

[0028] Figure 5 This is a schematic diagram of torque flow when the dual-motor coaxial symmetrical three-mode electric drive bridge described in the present invention works in a dual-motor distributed drive mode. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0031] like Figure 1 As shown, the present invention provides a dual-motor coaxial symmetrical three-mode electric drive axle, which is mainly composed of a left half-shaft 100, a left drive motor 200, a drive axle housing 300, a left mode switching mechanism 400, a centralized drive mode power transmission mechanism 500, an open differential 600, a right mode switching mechanism 700, a right mode switching mechanism 800, and a right half-shaft 900.

[0032] like Figure 2As shown, the left-side driving motor 200 is an inner rotor hollow shaft motor, which includes: a housing 201, a stator coil 202, a hollow shaft inner rotor 203, and a hollow power output shaft 204; the left-side mode switching mechanism 400 includes: a primary reduction driving gear 406, a primary reduction driven gear 401, an intermediate shaft 402, a distributed driving mode driving gear 403, a distributed driving mode driven gear 407, a distributed driving mode ring gear 404, a centralized driving mode ring gear 409, a spline hub 408, and a coupling sleeve 405; the centralized driving mode power transmission mechanism 500 includes: a transmission The driving shaft 501, the reduction driving gear 502, and the reduction driven gear 503; the right side mode switching mechanism 700, which includes: a first-stage reduction driving gear 706, a first-stage reduction driven gear 701, an intermediate shaft 702, a distributed drive mode driving gear 703, a distributed drive mode driven gear 707, a distributed drive mode ring gear 704, a centralized drive mode ring gear 709, a spline hub 708, and a coupling sleeve 705; the right side drive motor 800 is an inner rotor hollow shaft motor, which includes: a housing 801, a stator coil 802, a hollow shaft inner rotor 803, and a hollow power output shaft 804.

[0033] like Figure 2 As shown, the first-stage reduction driving gear 406 is connected to the hollow power output shaft 204 of the left-side driving motor 200 through a spline, the first-stage reduction driven gear 401 is connected to the intermediate shaft 402 through a spline, the left side of the intermediate shaft 402 is supported on the drive axle housing 300 through a bearing, the distributed drive mode driving gear 403 is loosely sleeved on the intermediate shaft 402, and the distributed drive mode driven gear 407 is connected to the left-side half shaft 100 through a spline; the distributed drive mode ring gear 404 is connected to the distributed drive mode driving gear 403; and the spline hub 408 is connected to the intermediate shaft 402 through a spline. The first-stage reduction driving gear 706 is connected to the hollow power output shaft 804 of the right-side driving motor 800 through a spline, the first-stage reduction driven gear 701 is connected to the intermediate shaft 702 through a spline, the right side of the intermediate shaft 702 is supported on the drive axle housing 300 through a bearing, the distributed drive mode driving gear 703 is loosely sleeved on the intermediate shaft 702, and the distributed drive mode driven gear 707 is connected to the right-side half shaft 900 through a spline; the distributed drive mode ring gear 704 is connected to the distributed drive mode driving gear 703; the spline hub 708 is connected to the intermediate shaft 702 through a spline.

[0034] like Figure 2As shown, the left end of the transmission shaft 501 is a hollow shaft, which is loosely sleeved on the right end of the intermediate shaft 1 402 of the left mode switching mechanism 400; the right end of the transmission shaft 501 is a hollow shaft, which is loosely sleeved on the left end of the intermediate shaft 2 702 of the right mode switching mechanism 700; the reduction driving gear 502 is connected to the transmission shaft 501 through a spline; the reduction driven gear 503 is fixedly connected to the outer shell of the open differential 600; the centralized drive mode ring gear 1 409 is connected to the left hollow end of the transmission shaft 501 through a spline; the centralized drive mode ring gear 2 709 is connected to the right hollow end of the transmission shaft 501 through a spline.

[0035] like Figure 2 As shown, the left driving motor 200 and the left mode switching mechanism 400 are symmetrically arranged on the left and right sides of the open differential 600 with the right driving motor 800 and the right mode switching mechanism 700 respectively.

[0036] like Figure 3 As shown, the left drive motor 200 outputs torque, and the right drive motor 800 does not output torque. The coupling sleeve 1 405 is coupled with the centralized drive mode ring gear 1 409, and the coupling sleeve 2 705 is in the middle position. At this time, the dual-motor coaxial symmetrical three-mode electric drive bridge works in the single-motor centralized drive mode. The torque output by the left drive motor 200 is sequentially transmitted to the open differential 600 through the hollow power output shaft 1 204, the first-stage reduction driving gear 1 406, the first-stage reduction driven gear 1 401, the intermediate shaft 1 402, the spline hub 1 408, the centralized drive mode ring gear 1 409, the transmission shaft 501, the reduction driving gear 502, and the reduction driven gear 503. Finally, the drive torque is evenly distributed to the left half shaft 100 and the right half shaft 900 through the open differential 600.

[0037] like Figure 4As shown, the left drive motor 200 and the right drive motor 800 output torque at the same time, the combination sleeve 405 is combined with the centralized drive mode ring gear 1 409, and the combination sleeve 2 705 is combined with the centralized drive mode ring gear 2 709. At this time, the dual-motor coaxial symmetrical three-mode electric drive bridge operates in the dual-motor centralized drive mode. The torque output by the left driving motor 200 is sequentially transmitted to the open differential 600 through the hollow power output shaft 1 204, the first-stage reduction driving gear 1 406, the first-stage reduction driven gear 1 401, the intermediate shaft 1 402, the spline hub 1 408, the centralized drive mode gear ring 1 409, the transmission shaft 501, the reduction driving gear 502, and the reduction driven gear 503; the torque output by the right driving motor 800 is sequentially transmitted to the open differential 600 through the hollow power output shaft 2 804, the first-stage reduction driving gear 2 706, the first-stage reduction driven gear 2 701, the intermediate shaft 2 702, the spline hub 2 708, the centralized drive mode gear ring 2 709, the transmission shaft 501, the reduction driving gear 502, and the reduction driven gear 503. Finally, the open differential 600 evenly distributes the torque output by the left driving motor 200 and the torque output by the right driving motor 800 to the left half shaft 100 and the right half shaft 900.

[0038] like Figure 4 As shown, the left drive motor 200 and the right drive motor 800 output torque at the same time, the combination sleeve 1 405 is combined with the distributed drive mode ring gear 1 404, and the combination sleeve 2 705 is combined with the distributed drive mode ring gear 2 704. At this time, the dual-motor coaxial symmetrical three-mode electric drive bridge works in the dual-motor distributed drive mode. The torque output by the left drive motor 200 is sequentially transmitted to the left half shaft 100 through the hollow power output shaft 1 204, the first-stage reduction driving gear 1 406, the first-stage reduction driven gear 1 401, the intermediate shaft 1 402, the spline hub 1 408, the distributed drive mode ring gear 1 404, the distributed drive mode driving gear 1 403, and the distributed drive mode driven gear 1 407. The torque output by the right-side drive motor 800 is transmitted to the right-side half-shaft 900 in sequence through the hollow power output shaft 804, the first-stage reduction driving gear 706, the first-stage reduction driven gear 701, the intermediate shaft 702, the spline hub 708, the distributed drive mode ring gear 704, the distributed drive mode driving gear 703, and the distributed drive mode driven gear 707.

[0039] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A dual-motor coaxial symmetrical three-mode electric drive axle, characterized in that: include: The drive axle housing supports other components; The left driving motor is an inner rotor hollow shaft motor, which comprises: a housing 1, a stator coil 1, a hollow shaft inner rotor 1, and a hollow power output shaft 1; The right driving motor is an inner rotor hollow shaft motor, which includes: a second housing, a second stator coil, a second hollow shaft inner rotor, and a second hollow power output shaft; The left mode switching mechanism includes: a primary reduction driving gear 1, a primary reduction driven gear 1, an intermediate shaft 1, a distributed drive mode driving gear 1, a distributed drive mode driven gear 1, a distributed drive mode ring gear 1, a centralized drive mode ring gear 1, a spline hub 1, and a coupling sleeve 1; The right mode switching mechanism includes: a first-stage reduction driving gear 2, a first-stage reduction driven gear 2, a second intermediate shaft, a second distributed drive mode driving gear, a second distributed drive mode driven gear, a second distributed drive mode ring gear, a second centralized drive mode ring gear, a second spline hub, and a second coupling sleeve; A centralized drive mode power transmission mechanism, comprising: a transmission shaft, a reduction driving gear, and a reduction driven gear; open differential; Left half shaft; Right half shaft.

2. The dual-motor coaxial symmetrical three-mode electric drive axle according to claim 1, characterized in that: The first-stage reduction driving gear 1 is connected to the hollow power output shaft 1 of the left-side driving motor through a spline; The first-stage reduction driven gear 1 is connected to the intermediate shaft 1 via a spline; The left side of the intermediate shaft 1 is supported on the drive axle housing through a bearing; The distributed drive mode driving gear 1 is loosely sleeved on the intermediate shaft 1; The distributed drive mode driven gear 1 is connected to the left half shaft through a spline; The distributed drive mode ring gear 1 is connected to the distributed drive mode driving gear 1; The spline hub 1 is connected to the intermediate shaft 1 through a spline.

3. The dual-motor coaxial symmetrical three-mode electric drive axle according to claim 1, characterized in that: The first-stage reduction driving gear 2 is connected to the hollow power output shaft 2 of the right-side driving motor via a spline; The first-stage reduction driven gear 2 is connected to the intermediate shaft 2 via a spline; The right side of the intermediate shaft 2 is supported on the drive axle housing through a bearing; The distributed drive mode driving gear 2 is loosely sleeved on the intermediate shaft 2; The distributed drive mode driven gear 2 is connected to the right half shaft through a spline; The distributed drive mode gear ring 2 is connected to the distributed drive mode driving gear 2; The second spline hub is connected to the second intermediate shaft via a spline.

4. The dual-motor coaxial symmetrical three-mode electric drive axle according to claim 1, characterized in that: The left end of the transmission shaft is a hollow shaft, which is sleeved on the right end of the intermediate shaft 1 of the left mode switching mechanism; the right end of the transmission shaft is a hollow shaft, which is sleeved on the left end of the intermediate shaft 2 of the right mode switching mechanism; The speed reduction driving gear is connected to the transmission shaft via a spline; The reduction driven gear is fixedly connected to the outer housing of the open differential; The centralized drive mode gear ring 1 is connected to the left hollow end of the transmission shaft through a spline; The centralized drive mode gear ring 2 is connected to the right hollow end of the transmission shaft through a spline.

5. The dual-motor coaxial symmetrical three-mode electric drive axle according to claim 1, characterized in that: The left-side driving motor and the left-side mode switching mechanism are respectively coaxially symmetrically arranged with the right-side driving motor and the right-side mode switching mechanism on the left and right sides of the open differential.

6. The dual-motor coaxial symmetrical three-mode electric drive axle according to claim 1, characterized in that: By controlling the output torque of the left drive motor and the right drive motor and the positions of the first and second coupling sleeves, the switching between the three working modes of single motor centralized drive mode, dual motor centralized drive mode and dual motor distributed drive mode can be realized; When the left-side drive motor outputs torque and the right-side drive motor does not output torque, the coupling sleeve 1 is coupled with the centralized drive mode gear ring 1, and the coupling sleeve 2 is in the middle position. At this time, the dual-motor coaxial symmetrical three-mode electric drive bridge operates in a single-motor centralized drive mode; When the left-side drive motor and the right-side drive motor output torque at the same time, the coupling sleeve 1 is coupled with the centralized drive mode gear ring 1, and the coupling sleeve 2 is coupled with the centralized drive mode gear ring 2. At this time, the dual-motor coaxial symmetrical three-mode electric drive bridge operates in the dual-motor centralized drive mode; When the left-side drive motor and the right-side drive motor output torque at the same time, the coupling sleeve 1 is combined with the distributed drive mode ring gear 1, and the coupling sleeve 2 is combined with the distributed drive mode ring gear 2. At this time, the dual-motor coaxial symmetrical three-mode electric drive bridge operates in the dual-motor distributed drive mode.

Images