Double-motor coaxial driving system for left and right wheel edges of pure electric vehicle

Abstract

The invention discloses a pure electric vehicle left and right wheel double-motor coaxial driving system which comprises a first motor and a second motor which are located on the two sides of a hub, the first motor comprises a motor shell and a speed reducer shell, a motor rotating shaft is arranged in the motor shell, and a speed reducing mechanism is arranged in the speed reducer shell. The motor rotating shaft is connected with the speed reducing mechanism, the speed reducing mechanism is connected with the hub rotating shaft, the second motor is the same as the first motor in structure, and a clutch mechanism is arranged between the speed reducing mechanism in the second motor and the hub rotating shaft, so that the occupied space is reduced, a larger battery is placed, and the continuation mileage is increased; due to the design of an integrated and coaxial structure, the appearance of the whole vehicle is more harmonious and attractive, the weight is light, the appearance is compact, a planetary reducer coaxial driving mode is adopted, and the efficiency is higher.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive, and more specifically relates to a coaxial drive system of dual motors on left and right wheels of a pure electric vehicle. Background Art

[0002] With the development and popularization of automobile electrification technology, electrification technology has gradually expanded to other fields, such as ship electrification, engineering machinery electrification, pure electric two-wheeled and three-wheeled motorcycles and other industries. Previously, electric drive in the motorcycle industry was mostly used in small-displacement models such as electric bicycles and mopeds. In recent years, electric drive technology has also been gradually applied to large motorcycles.

[0003] In the field of electric drive, the commonly used structural forms include hub motors and mid-mounted motors. Although the hub motor method has a simple structure, the hub motor is heavy and inefficient, which not only affects the handling performance of the vehicle, but also increases material costs and has poor waterproof and sealing performance. The mid-mounted motor has a long transmission path and will occupy limited battery space, reducing the vehicle's range. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a coaxial drive system with dual motors on the left and right wheels of a pure electric vehicle, which takes up less space and can accommodate larger batteries to increase the driving range. The integrated and coaxial structure design has a more coordinated and beautiful appearance, light weight, compact shape and high efficiency.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a dual-motor coaxial drive system for the left and right wheels of a pure electric vehicle, comprising a first motor and a second motor located on both sides of a wheel hub, the first motor comprising a motor housing and a reducer housing, a motor shaft being arranged in the motor housing, a reduction mechanism being arranged in the reducer housing, the motor shaft being connected to the reduction mechanism, and the reduction mechanism being connected to the wheel hub shaft, the second motor having the same structure as the first motor, and a clutch mechanism being arranged between the reduction mechanism in the second motor and the wheel hub shaft.

[0006] Furthermore, the reduction mechanism includes a central gear located on the motor shaft, a plurality of planetary gears and a fixed gear ring located on the inner wall of the reducer housing, a bracket is arranged between the plurality of planetary gears, and the planetary gears are rotatably connected to the bracket, the bracket on the first motor is connected to the hub shaft, and an output shaft is arranged on the bracket of the second motor, and the output shaft is connected to the hub shaft through a clutch mechanism.

[0007] Furthermore, the clutch mechanism includes a clutch fixing sleeve and a one-way bearing, the inner ring of the one-way bearing is connected to the hub shaft, the outer ring of the one-way bearing is connected to the clutch fixing sleeve, and the clutch fixing sleeve is connected to the output shaft on the second motor.

[0008] Furthermore, the clutch fixing sleeve is connected to the one-way bearing and the output shaft via a flat key, and a set screw is provided on the spline sleeve.

[0009] Furthermore, the clutch mechanism includes a one-way bearing and a clutch drive rod, the clutch drive rod is rotatably connected to a clutch drive sleeve, the inner ring of the one-way bearing is connected to the wheel hub shaft, the outer ring of the one-way bearing is connected to the clutch drive sleeve via a spline, the clutch drive sleeve is slidably connected to the output shaft on the second motor, and the clutch drive rod is connected to a drive mechanism.

[0010] Furthermore, a spline sleeve is provided on the output shaft, the spline sleeve is connected to the output shaft via a flat key, the clutch drive sleeve is slidably connected to the spline sleeve via a spline, and a set screw is provided on the spline sleeve.

[0011] Furthermore, the clutch mechanism comprises a clutch drive rod, the clutch drive rod is rotatably connected to a clutch drive sleeve, the clutch drive sleeve is slidingly connected to the wheel hub shaft and the output shaft on the second motor respectively, and the clutch drive rod is connected to a drive mechanism.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention divides the conventionally designed mid-mounted motor or wheel hub motor into two smaller wheel-side motors, and the left and right dual motor arrangement makes the weight distribution of the whole vehicle more reasonable, the handling performance is better, and the vehicle space occupied by the mid-mounted motor is reduced, so that a larger battery can be placed, the cruising range is increased, and the performance degradation caused by the increase in the rotational inertia caused by the wheel hub motor is reduced. The left and right independent drive and control can better make the whole vehicle more in a power-saving operation state. The integrated and coaxial structure design makes the appearance of the whole vehicle more coordinated and beautiful, light in weight, and compact in appearance. The coaxial drive mode of the planetary reducer is adopted, which is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of a dual-motor coaxial drive system for left and right wheels of a pure electric vehicle according to an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of a coaxial drive system of dual motors on the left and right wheels of a pure electric vehicle according to the second embodiment of the present invention;

[0015] Figure 3 It is a schematic diagram of the structure of the first motor in the coaxial drive system of the left and right wheel dual motors of the pure electric vehicle of the present invention.

[0016] Figure numerals: first motor 1; second motor 2; motor housing 3; reducer housing 4; motor shaft 5; reduction mechanism 6; hub shaft 7; hub 8; clutch mechanism 9; central gear 10; planetary gear 11; fixed ring gear 12; output shaft 13; clutch fixing sleeve 14; one-way bearing 15; clutch drive rod 16; clutch drive sleeve 17; spline sleeve 18; bracket 19. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, "several" and "a number" mean two or more, unless otherwise clearly and specifically defined.

[0019] Reference Figures 1 to 3 The present invention is further described.

[0020] Embodiment 1:

[0021] A pure electric vehicle has a left and right wheel dual-motor coaxial drive system, comprising a first motor 1 and a second motor 2 located on both sides of a wheel hub 8, wherein the first motor 1 comprises a motor housing 3 and a reducer housing 4, wherein a motor shaft 5 is arranged in the motor housing 3, wherein a reduction mechanism 6 is arranged in the reducer housing 4, wherein the motor shaft 5 is connected to the reduction mechanism 6, wherein the reduction mechanism 6 is connected to a wheel hub shaft 7, wherein the structure of the second motor 2 is the same as that of the first motor 1, and a clutch mechanism 9 is arranged between the reduction mechanism 6 in the second motor 2 and the wheel hub shaft 7.

[0022] like Figure 1As shown, in the embodiment, preferably, the reduction mechanism 6 includes a central gear 10 located on the motor shaft 5, a plurality of planetary gears 11 and a fixed ring gear 12 located on the inner wall of the reducer housing 4, a bracket 19 is arranged between the plurality of planetary gears 11, and the planetary gears 11 are rotatably connected to the bracket 19, the bracket 19 on the first motor 1 is connected to the hub shaft 7, and an output shaft 13 is arranged on the bracket 19 of the second motor 2, and the output shaft 13 is connected to the hub shaft 7 through a clutch mechanism 9.

[0023] Specifically, the motor shaft 5 rotates, driving the planetary gear 11 to rotate around the center of the motor shaft 5, and outputs power through the connected bracket 19, that is, the bracket 19 of the first motor 1 is directly connected to the hub shaft 7, directly driving the hub 8 to rotate.

[0024] Specifically, the first motor 1 and the second motor 2 are both connected to the vehicle frame.

[0025] like Figure 1 As shown, in the embodiment, preferably, the clutch mechanism 9 includes a clutch fixing sleeve 14 and a one-way bearing 15, the inner ring of the one-way bearing 15 is connected to the hub shaft 7, the outer ring of the one-way bearing 15 is connected to the clutch fixing sleeve 14, and the clutch fixing sleeve 14 is connected to the output shaft 13 on the second motor 2.

[0026] like Figure 1 As shown, in the preferred embodiment, the clutch fixing sleeve 14 is connected to the one-way bearing 15 and the output shaft 13 via a flat key, and a set screw is provided on the spline sleeve 18 .

[0027] like Figure 1 As shown, the first motor 1 directly drives the wheel hub 8 to rotate. Due to the setting of the one-way bearing 15, when the first motor 1 is running, it will not transmit power to the output shaft 13 of the reduction mechanism 6 of the second motor 2, so as to prevent power loss and damage to the two motors. When the second motor 2 is needed to participate in power output, the second motor 2 can transmit power to the wheel hub shaft 7 through the one-way bearing 15, so as to realize power output of the two motors.

[0028] The present invention divides the conventional mid-mounted motor or wheel hub motor into two smaller wheel-side motors. The left and right dual motor arrangement makes the weight distribution of the vehicle more reasonable and the handling performance better, reduces the vehicle space occupied by the mid-mounted motor, can accommodate larger batteries, increase the cruising range, and reduce the performance degradation caused by the increase in the rotational inertia of the wheel hub motor. The left and right independent drive and control can better put the vehicle in a more power-saving operation state. The integrated and coaxial structure design makes the appearance of the vehicle more coordinated and beautiful, light in weight, and compact in appearance. The planetary reducer coaxial drive method is adopted, which is more efficient.

[0029] Specifically, the arrangement positions of the first motor 1 and the second motor 2 may also be swapped left to right.

[0030] Specifically, under certain requirements, the one-way bearing 15 can be removed, so that the outputs of the first motor 1 and the second motor 2 are directly connected to the hub shaft 7, that is, driven by the two motors at the same time.

[0031] Embodiment 2

[0032] A pure electric vehicle has a left and right wheel dual-motor coaxial drive system, comprising a first motor 1 and a second motor 2 located on both sides of a wheel hub 8, wherein the first motor 1 comprises a motor housing 3 and a reducer housing 4, wherein a motor shaft 5 is arranged in the motor housing 3, wherein a reduction mechanism 6 is arranged in the reducer housing 4, wherein the motor shaft 5 is connected to the reduction mechanism 6, wherein the reduction mechanism 6 is connected to a wheel hub shaft 7, wherein the structure of the second motor 2 is the same as that of the first motor 1, and a clutch mechanism 9 is arranged between the reduction mechanism 6 in the second motor 2 and the wheel hub shaft 7.

[0033] like Figure 2 As shown, in the embodiment, preferably, the clutch mechanism 9 includes a one-way bearing 15 and a clutch drive rod 16, and the clutch drive rod 16 is rotatably connected to a clutch drive sleeve 17, the inner ring of the one-way bearing 15 is connected to the hub shaft 7, and the outer ring of the one-way bearing 15 is connected to the clutch drive sleeve 17 through a spline, the clutch drive sleeve 17 is slidably connected to the output shaft 13 on the second motor 2, and the clutch drive rod 16 is connected to a drive mechanism.

[0034] Specifically, the driving mechanism may be an electric telescopic rod or a hydraulic telescopic cylinder.

[0035] like Figure 2 As shown, in the embodiment, preferably, a spline sleeve 18 is provided on the output shaft 13, the spline sleeve 18 is connected to the output shaft 13 via a flat key, the clutch drive sleeve 17 is slidably connected to the spline sleeve 18 via a spline, and a set screw is provided on the spline sleeve 18.

[0036] like Figure 2 As shown, the first motor 1 directly drives the wheel hub 8 to rotate. When the second motor 2 is not needed to participate in the driving, the clutch drive rod 16 drives the clutch drive sleeve 17 to the right to separate the connection between the one-way bearing 15 and the output shaft 13 on the second motor 2. At this time, the wheel hub shaft 7 is only driven by the first motor 1, and the one-way bearing 15 is located on the wheel hub shaft 7 and idling. When the second motor 2 needs to participate in the driving, the clutch drive rod 16 drives the clutch drive sleeve 17 to the left to connect the one-way bearing 15 and the output shaft 13 of the second motor 2, and then the second motor 2 is started, and the power can be transmitted to the wheel hub shaft 7 through the one-way bearing 15, and when the second motor 2 stops briefly, the one-way bearing 15 can prevent the power of the first motor 1 from being transmitted to the second motor 2.

[0037] The arrangement of the clutch drive rod 16 and the clutch drive sleeve 17 can completely disconnect the second motor 2 from the wheel hub shaft 7 when the second motor 2 is not involved in the driving for a long time, thereby reducing the wear of the one-way bearing 15 caused by the long-term lack of power output of the second motor 2, and completely eliminating the slight rotation of the output shaft 13 of the second motor 2 due to friction inertia or bearing friction between the inner and outer rings of the one-way bearing 15, thereby avoiding any energy loss and improving the efficiency of the first motor 1. At the same time, when the auxiliary motor fails to drive, it can be directly disconnected to avoid affecting the operation of the first motor 1 and improve system reliability. The combination of the two retains the one-way isolation advantage of the one-way bearing 15, and realizes the complete disengagement or participation of the auxiliary motor through the on and off of the clutch, providing more comprehensive power management capabilities, thereby optimizing efficiency, flexibility and safety.

[0038] Specifically, it can also be applied to the first motor 1 which can be reversed, and reverse driving can be achieved when the clutch drive sleeve 17 disconnects the one-way bearing 15 and the output shaft 13 of the second motor 2 .

[0039] Other technical features are the same as those of the first embodiment.

[0040] Embodiment 3

[0041] A pure electric vehicle has a left and right wheel dual-motor coaxial drive system, comprising a first motor 1 and a second motor 2 located on both sides of a wheel hub 8, wherein the first motor 1 comprises a motor housing 3 and a reducer housing 4, wherein a motor shaft 5 is arranged in the motor housing 3, wherein a reduction mechanism 6 is arranged in the reducer housing 4, wherein the motor shaft 5 is connected to the reduction mechanism 6, wherein the reduction mechanism 6 is connected to a wheel hub shaft 7, wherein the structure of the second motor 2 is the same as that of the first motor 1, and a clutch mechanism 9 is arranged between the reduction mechanism 6 in the second motor 2 and the wheel hub shaft 7.

[0042] Preferably in the embodiment, the clutch mechanism 9 includes a clutch drive rod 16, and a clutch drive sleeve 17 is rotatably connected to the clutch drive rod 16. The clutch drive sleeve 17 is slidingly connected to the hub shaft 7 and the output shaft 13 on the second motor 2 respectively, and the clutch drive rod 16 is connected to a drive mechanism.

[0043] Other technical features are the same as those of the second embodiment.

[0044] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. The dual-motor coaxial drive system for the left and right wheels of a pure electric vehicle is characterized by: It includes a first motor and a second motor located on both sides of the wheel hub, the first motor includes a motor housing and a reducer housing, a motor shaft is arranged in the motor housing, a reduction mechanism is arranged in the reducer housing, the motor shaft is connected to the reduction mechanism, and the reduction mechanism is connected to the wheel hub shaft, the second motor structure is the same as the first motor, and a clutch mechanism is arranged between the reduction mechanism in the second motor and the wheel hub shaft.

2. The pure electric vehicle left and right wheel dual-motor coaxial drive system according to claim 1 is characterized by: The reduction mechanism includes a central gear located on the motor shaft, a plurality of planetary gears and a fixed gear ring located on the inner wall of the reducer housing. A bracket is arranged between the plurality of planetary gears, and the planetary gears are rotatably connected to the bracket. The bracket on the first motor is connected to the hub shaft, and an output shaft is arranged on the bracket of the second motor, and the output shaft is connected to the hub shaft through a clutch mechanism.

3. The pure electric vehicle left and right wheel dual-motor coaxial drive system according to claim 2 is characterized by: The clutch mechanism comprises a clutch fixing sleeve and a one-way bearing, the inner ring of the one-way bearing is connected to the hub shaft, the outer ring of the one-way bearing is connected to the clutch fixing sleeve, and the clutch fixing sleeve is connected to the output shaft on the second motor.

4. The pure electric vehicle left and right wheel dual-motor coaxial drive system according to claim 3 is characterized by: The clutch fixing sleeve is connected to the one-way bearing and the output shaft through a flat key, and a set screw is arranged on the spline sleeve.

5. The pure electric vehicle left and right wheel dual-motor coaxial drive system according to claim 2 is characterized by: The clutch mechanism includes a one-way bearing and a clutch drive rod, the clutch drive rod is rotatably connected to a clutch drive sleeve, the inner ring of the one-way bearing is connected to the wheel hub shaft, the outer ring of the one-way bearing is connected to the clutch drive sleeve via a spline, the clutch drive sleeve is slidably connected to the output shaft on the second motor, and the clutch drive rod is connected to a drive mechanism.

6. The pure electric vehicle left and right wheel dual-motor coaxial drive system according to claim 5 is characterized by: The output shaft is provided with a spline sleeve, the spline sleeve is connected to the output shaft via a flat key, the clutch drive sleeve is slidably connected to the spline sleeve via a spline, and a set screw is provided on the spline sleeve.

7. The pure electric vehicle left and right wheel dual-motor coaxial drive system according to claim 2 is characterized by: The clutch mechanism comprises a clutch drive rod, a clutch drive sleeve is rotatably connected to the clutch drive rod, the clutch drive sleeve is slidably connected to the wheel hub shaft and the output shaft on the second motor respectively, and the clutch drive rod is connected to the drive mechanism.

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