Power-driven system, chassis architecture, and vehicle

Abstract

A power-driven system, a chassis architecture, and a vehicle. The power-driven system comprises a driving unit and a power coupling structure; the driving unit comprises a first driving unit and a second driving unit; the first driving unit is provided with a first output shaft, and the second driving unit is provided with a second output shaft; the power coupling structure is provided between the first driving unit and the second driving unit; the power-driven system has a first mode and a second mode; in the first mode, the first driving unit independently drives the first output shaft, and the second driving unit independently drives the second output shaft; and in the second mode, the first driving unit is linked with the second driving unit by means of the power coupling structure, so that the power of the first driving unit and the power of the second driving unit can be intensively outputted by means of the first output shaft or the second output shaft.

Description

Powertrain, chassis architecture and vehicles

[0001] This application claims priority to Chinese patent application No. 202410003880.1 filed on January 2, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to, but is not limited to, the technical field of vehicle power systems, and in particular to a power drive system, a chassis structure, and a vehicle. Background Art

[0003] Distributed dual electric drive offers numerous unique advantages, including a simple structure, efficient and energy-efficient transmission, and independently controllable drive and braking torques. It can even eliminate the need for steering, making it a future trend in intelligent new energy vehicles. Under normal driving conditions, wheel torque is sufficient for overtaking. However, in complex road conditions, such as climbing a slope or getting out of trouble, the wheels are prone to spinning and slipping, resulting in insufficient torque. Technical issues

[0004] The main purpose of this application is to provide a power drive system to improve the vehicle's ability to escape from difficult road conditions such as climbing slopes and getting out of trouble. Technical Solutions

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] To achieve the above objectives, the power drive system proposed in this application includes:

[0007] a drive unit comprising a first drive unit and a second drive unit, wherein the first drive unit has a first output shaft and the second drive unit has a second output shaft; and

[0008] A power coupling structure is provided between the first drive unit and the second drive unit, and the power drive system has a first mode and a second mode. In the first mode, the first drive unit independently drives the first output shaft and the second drive unit independently drives the second output shaft; in the second mode, the first drive unit is linked with the second drive unit through the power coupling structure so that the power of the first drive unit and the second drive unit can be output in a concentrated manner through the first output shaft or the second output shaft.

[0009] In one embodiment, the power coupling structure is provided between the first output shaft and the second output shaft, and in the second mode, the first output shaft is linked to the second output shaft via the power coupling structure.

[0010] In one embodiment, the axis of the first output shaft extends along a first direction, and the power coupling structure includes a first meshing portion, a second meshing portion and an actuating mechanism. In the first direction, the first meshing portion is fixed relative to the drive unit, and the second meshing portion is movable relative to the drive unit, and the actuating mechanism is capable of at least causing the second meshing portion to approach and mesh with the first meshing portion; one of the first meshing portion and the second meshing portion is provided on the first output shaft, and the other is provided on the second output shaft.

[0011] In one embodiment, the first meshing portion and the second meshing portion are distributed along the radial direction of the first output shaft, the outer circumference of the first meshing portion is provided with a first tooth portion, and the inner circumference of the second meshing portion is provided with a second tooth portion, and the second tooth portion can move along the first direction and be engaged with the first tooth portion.

[0012] In one embodiment, the first meshing portion and the second meshing portion are distributed along the axial direction of the first output shaft, the end surface of the first meshing portion is provided with a first tooth portion, and the end surface of the second meshing portion is provided with a second tooth portion, and the second tooth portion can move along the first direction and abut and engage with the first tooth portion.

[0013] In one embodiment, the first output shaft includes a first shaft segment and a second shaft segment connected to each other, the first shaft segment is connected to the first drive unit, the second output shaft includes a third shaft segment, the third shaft segment is provided with a mounting cavity for the second shaft segment to extend into, and the first tooth portion and the second tooth portion are both provided in the mounting cavity.

[0014] In one embodiment, the first meshing portion and the second meshing portion are distributed along the radial direction of the first output shaft, the second meshing portion is slidably arranged on the inner side surface of the mounting cavity, the actuating mechanism is arranged on the third shaft segment, and the first meshing portion is fixedly arranged on the circumferential side surface of the second shaft segment.

[0015] In one embodiment, an inner side surface of the mounting cavity is provided with an internal spline, and a peripheral side surface of the second engaging portion is provided with an external spline, and the external spline is adapted to be arranged on the internal spline.

[0016] In one embodiment, the third shaft segment includes a first shell portion and a second shell portion that are spliced ​​together, the first shell portion and the second shell portion jointly enclose the installation cavity, the second shell portion is disposed adjacent to the first shaft segment, and the actuating mechanism is disposed in the first shell portion;

[0017] In one embodiment, the first meshing portion and the second meshing portion are distributed along the axial direction of the first output shaft, the second meshing portion is slidably arranged on the circumferential side surface of the second shaft segment, the first meshing portion is the second shell portion, and the first tooth portion is arranged on the end surface of the second shell portion close to the mounting cavity.

[0018] In one embodiment, the power coupling structure also includes an elastic return member provided in the mounting cavity, wherein the elastic return member connects the second meshing portion and the third shaft segment, and when the actuating mechanism drives the second meshing portion to approach the first meshing portion, the elastic deformation of the elastic return member increases.

[0019] In one embodiment, the actuating mechanism includes a pin shaft and a driving member, and a clearance hole is provided on the bottom wall of the mounting cavity. The first end of the pin shaft passes through the clearance hole and extends into the mounting cavity and is capable of abutting the second engaging portion. The second end of the pin shaft is located outside the mounting cavity and is driven by the driving member.

[0020] In one embodiment, the actuating mechanism further comprises a shift fork movably provided on the third shaft segment, one end of the shift fork is connected to the driving member, and the other end of the shift fork is connected to the second end of the pin shaft.

[0021] In one embodiment, the driving member includes an electromagnet, and the pin is made of a magnetic material. When the electromagnet is energized, it can generate a repulsive force on the pin and cause the pin to push the second engaging portion to engage with the first engaging portion.

[0022] In one embodiment, the first output shaft includes a first shaft segment and a second shaft segment connected to each other, the first shaft segment is connected to the first drive unit, the second output shaft includes a third shaft segment and a fourth shaft segment, the third shaft segment is connected to the second drive unit, the second shaft segment and the fourth shaft segment are arranged opposite to and adjacent to each other, one of the second shaft segment and the fourth shaft segment is provided with the second meshing portion, and the other is provided with the first meshing portion.

[0023] In one embodiment, the first meshing portion and the second meshing portion are distributed along the radial direction of the first output shaft, the second meshing portion is provided with a first internal spline and a second internal spline at intervals along the first direction, the first meshing portion is provided with a first external spline corresponding to the first internal spline, the second shaft segment is provided with a second external spline corresponding to the second internal spline, and the second external spline is slidably sleeved on the second internal spline; the first external spline is the first tooth portion, and the first internal spline is the second tooth portion.

[0024] In one embodiment, the fourth shaft segment is provided with a shaft inner cavity, the end of the second shaft segment is provided with a supporting step, the supporting step at least partially extends into the shaft inner cavity, and the power drive system also includes a third bearing, the third bearing is provided between the inner side surface of the shaft inner cavity and the supporting step.

[0025] In one embodiment, the second shaft segment and the fourth shaft segment are spaced apart in the first direction, the first meshing portion and the second meshing portion are distributed along the axial direction of the first output shaft, the second meshing portion is slidably arranged on the circumferential side surface of the second shaft segment, and the first meshing portion is fixedly arranged on the circumferential side surface of the fourth shaft segment.

[0026] In one embodiment, the actuating mechanism includes a push-pull member and a driving member, the second engaging portion is provided with a force-bearing groove corresponding to the push-pull member, the first end of the push-pull member is inserted into the force-bearing groove, the second end of the push-pull member is exposed outside the force-bearing groove and is driven by the driving member.

[0027] The present application also proposes a chassis structure, including the aforementioned power drive system.

[0028] The present application also proposes a vehicle comprising the aforementioned power drive system, or comprising the aforementioned chassis structure.

[0029] The present application also proposes a vehicle, comprising a vehicle body, a first drive wheel, a second drive wheel, and the aforementioned power drive system, wherein the first drive wheel and the second drive wheel are arranged on opposite sides of the vehicle body, the first output shaft of the power drive system is connected to the first drive wheel, and the second output shaft is connected to the second drive wheel. Beneficial effects

[0030] The technical solution of the present application, by adding a power coupling structure between the first drive unit and the second drive unit, can not only give full play to the advantages of the distributed dual electric drive when the vehicle is driving normally, but also can concentrate the output torque of the first drive unit and the second drive unit to the first output shaft or the second output shaft when the vehicle is in complex road conditions such as climbing a slope and getting out of trouble, and output it to the non-slip drive wheel through the first output shaft or the second output shaft, so as to improve the vehicle's ability to get out of trouble. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0032] FIG1 is a schematic structural diagram of a first embodiment of a power drive system of the present application;

[0033] FIG2 is a schematic structural diagram of a second embodiment of the power drive system of the present application;

[0034] FIG3 is a schematic structural diagram of a third embodiment of the power drive system of the present application;

[0035] FIG4 is a schematic structural diagram of a fourth embodiment of the power drive system of the present application;

[0036] FIG5 is a schematic structural diagram of a fifth embodiment of the power drive system of the present application;

[0037] FIG6 is a schematic structural diagram of a sixth embodiment of the power drive system of the present application;

[0038] FIG7 is a schematic structural diagram of a seventh embodiment of the power drive system of the present application;

[0039] FIG8 is a schematic diagram of the engagement of the first meshing portion and the second meshing portion of the embodiment shown in FIG4 ;

[0040] FIG9 is an exploded view of the structure shown in FIG8 ;

[0041] FIG10 is a partial enlarged view of point A in FIG9 ;

[0042] FIG11 is a schematic structural diagram of the second meshing portion of the embodiment shown in FIG5 .

[0043] Description of Figure Numbers:

[0044] Reference numerals Name Reference numerals Name 10 First driving unit 30 Power coupling structure 11 First motor 31 First meshing portion 12 First reduction gear set 311 First tooth portion 13 First output shaft 312 First external spline 131 First shaft segment 32 Second meshing portion 132 Second shaft segment 321 Second tooth portion 133 First flat key 322 Sliding keyway 134 Second external spline 323 First internal spline 135 Supporting step 324 Second internal spline 20 Second driving unit 325 Force groove 21 Second motor 326 Lead-in angle 22 Second reduction gear set 33 Actuating mechanism 23 Second output shaft 331 Pin shaft 23a Mounting cavity 332 Shift fork 23b Clearance hole 333 Push-pull member 23c Shaft inner cavity 34 Elastic return member 231 Third shaft segment 41 First bearing 232 Fourth shaft segment 42 Second bearing 233 First shell portion 43 Third bearing 234 Second shell portion

[0045] The realization of the purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Other aspects will become apparent after reading and understanding the accompanying drawings and detailed description. Modes for Carrying Out the Invention

[0046] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of 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.

[0047] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0050] This application proposes a power drive system that can be applied to a highly integrated chassis architecture or a vehicle, without specific limitation. The vehicle comprises a vehicle body and two drive wheels, namely, a first drive wheel and a second drive wheel, disposed on opposite sides of the vehicle body. Please refer to Figures 1 to 11 , where the cross-sectional views of Figures 4 to 7 only illustrate the relevant structure on one side of the central axis.

[0051] 1 to 7 , in one embodiment of the power drive system of the present application, the power drive system includes:

[0052] A drive unit including a first drive unit 10 and a second drive unit 20, wherein the first drive unit 10 has a first output shaft 13 and the second drive unit 20 has a second output shaft 23; and

[0053] The power coupling structure 30 is arranged between the first drive unit 10 and the second drive unit 20. The power drive system has a first mode and a second mode. In the first mode, the first drive unit 10 independently drives the first output shaft 13 and the second drive unit 20 independently drives the second output shaft 23; in the second mode, the first drive unit 10 is linked with the second drive unit 20 through the power coupling structure 30, so that the power of the first drive unit 10 and the second drive unit 20 can be output in a concentrated manner through the first output shaft 13 or the second output shaft 23.

[0054] Specifically, the following description will take the application of the power drive system to a vehicle as an example, wherein the first output shaft 13 is connected to the first drive wheel, and the second output shaft 23 is connected to the second drive wheel. When the vehicle is driving normally, the output torques of the first drive unit 10 and the second drive unit 20 are not coupled, and independently drive the drive wheels on both sides of the vehicle body. When the idling slip degrees of the drive wheels on both sides of the vehicle are different and there is a need to escape, the power coupling structure 30 is activated and causes the output torques of the first drive unit 10 and the second drive unit 20 to be coupled, so that the output torque originally transmitted to the drive wheel on the slipping side is transmitted to the drive wheel on the non-slipping side. In other words, the output torques of the first drive unit 10 and the second drive unit 20 are concentratedly transmitted to the drive wheel on the non-slipping side, thereby fully utilizing the adhesion of the drive wheel to generate sufficient traction, allowing the vehicle to escape and continue driving.

[0055] The technical solution of the present application, by adding a power coupling structure 30 between the first drive unit 10 and the second drive unit 20, can not only give full play to the advantages of the distributed dual electric drive when the vehicle is driving normally, but also can concentrate the output torque of the first drive unit 10 and the second drive unit 20 to the first output shaft 13 or the second output shaft 23 when the vehicle is in complex road conditions such as climbing a slope and getting out of trouble, and output it to the non-slip drive wheel through the first output shaft 13 or the second output shaft 23, so as to improve the vehicle's ability to get out of trouble.

[0056] Referring to Figure 1 , in the embodiment of the present application, the first drive unit 10 includes a first motor 11, the second drive unit 20 includes a second motor 21, and the vehicle further includes a power battery electrically connected to both the first motor 11 and the second motor 21. This helps reduce the vehicle's carbon emissions and enhance its market competitiveness. Of course, in other embodiments, an internal combustion engine or a steam engine may also be used as the power source for the first drive unit 10 and the second drive unit 20.

[0057] Without loss of generality, the drive unit typically includes a reduction gear structure disposed between the motor and the output shaft, including but not limited to a reduction gear set structure, which is not specifically limited in this application. However, for ease of explanation, the reduction gear set will be described below as the reduction gear set.

[0058] That is, referring to Figures 1 to 3, the first drive unit 10 also includes a first reduction gear group 12, the driving gear of the first-stage wheel group of the first reduction gear group 12 is provided on the rotating shaft of the first motor 11, and the driven gear of the final wheel group is provided on the first output shaft 13; the second drive unit 20 also includes a second reduction gear group 22, the driving gear of the first-stage wheel group of the second reduction gear group 22 is provided on the rotating shaft of the first motor 11, and the driven gear of the final wheel group is provided on the second output shaft 23.

[0059] There are many types of power coupling structures 30. For example, referring to FIG1 , in the first embodiment, the power coupling structure 30 is disposed between the rotating shaft of the first motor 11 and the rotating shaft of the second motor 21 , that is, the coupling position is at the input shaft, thereby realizing power coupling of the input shaft.

[0060] Referring to Figure 2 , in the second embodiment, the power coupling structure 30 is disposed between the rotating shafts of the driven gears of the primary wheelsets of the two drive units. In other words, the coupling location is on the intermediate shaft, thus achieving power coupling of the intermediate shafts. Of course, the power coupling structure 30 can also be disposed on other intermediate shafts and is not limited to the illustrated embodiment.

[0061] When in the second mode and unilateral torque output occurs, all components from the coupling position onward participate in the unilateral torque output, placing higher performance requirements on these components, including but not limited to torsional strength. In other words, components participating in the unilateral torque output must be able to withstand a torque at least twice the maximum peak torque of the first motor 11 or the second motor 21.

[0062] Without changing the component material, increasing the structural dimensions of the component is typically chosen to improve its performance, including torsional strength. The closer the coupling location is to the input end (e.g., the shaft of the first motor 11), the more components involved in the single-sided torque output. When these components are required to meet higher performance requirements, the overall layout space occupied by them increases, which is detrimental to the overall spatial layout of the power drive system.

[0063] Specifically, referring to FIG3 , in the third embodiment, a power coupling structure 30 is provided between the first output shaft 13 and the second output shaft 23 . In the second mode, the first output shaft 13 is linked to the second output shaft 23 via the power coupling structure 30 .

[0064] In the third embodiment, the first output shaft 13 and the second output shaft 23 are coaxially arranged, and the first motor 11 and the second motor 21 are arranged side by side on the vehicle body in the front-to-back direction, that is, a dual-motor parallel arrangement is adopted. This helps to simplify the structure of the power drive system and reduce the space required for its arrangement, making the system layout more compact. Of course, in other embodiments, the first output shaft 13 and the second output shaft 23 may not be coaxially arranged, and the first motor 11 and the second motor 21 may be staggered in the front-to-back direction of the vehicle, or arranged side by side in the left-right direction or the up-down direction of the vehicle.

[0065] Referring to Figures 4 to 7 , in the third embodiment, the axis of the first output shaft 13 extends along a first direction. The power coupling structure 30 includes a first meshing portion 31, a second meshing portion 32, and an actuating mechanism 33. In the first direction, the first meshing portion 31 is fixed relative to the drive unit, while the second meshing portion 32 is movable relative to the drive unit. The actuating mechanism 33 is capable of at least causing the second meshing portion 32 to approach and engage with the first meshing portion 31. One of the first meshing portion 31 and the second meshing portion 32 is disposed on the first output shaft 13, and the other is disposed on the second output shaft 23. In this manner, torque transmission is achieved using a meshing tooth structure, and the actuating mechanism 33 enables selective meshing transmission between the first meshing portion 31 and the second meshing portion 32, thereby enabling the power drive system to switch between a first mode and a second mode. This not only facilitates stable and smooth torque transmission, but also facilitates switching between a decoupled state and a coupled state of the power coupling structure 30.

[0066] Of course, in other embodiments, transmission methods other than meshing teeth may be employed, such as friction wheel transmission or hydraulic transmission. The friction wheel transmission structure may be referred to as a continuously variable transmission (CVT), and the hydraulic transmission structure may be referred to as a torque converter. In one embodiment, the friction wheel transmission structure includes two transmission wheels, a transmission belt disposed between the two transmission wheels, and an actuator 33 including a buffer wheel coaxially disposed and arranged in parallel with the transmission wheels, and an actuator capable of causing the transmission belt to move laterally. The two transmission wheels are disposed on the first output shaft 13 and the second output shaft 23, respectively. When the power drive system is in the first mode, the transmission belt is mounted on the buffer wheel, and the two transmission wheels rotate independently of each other. When the actuator causes the transmission belt to move laterally from the buffer wheel to the transmission wheel, the two transmission wheels are coupled to each other via the transmission belt, and the power drive system enters the second mode. When the actuator causes the transmission belt to move laterally from the transmission wheel to the buffer wheel, the two transmission wheels are decoupled, and the power drive system returns to the first mode.

[0067] There are various forms of engagement between the first meshing portion 31 and the second meshing portion 32. For example, referring to Figures 4, 6, 8 to 10, in the fourth and sixth embodiments, the first meshing portion 31 and the second meshing portion 32 are distributed radially along the first output shaft 13, and the outer circumferential surface of the first meshing portion 31 is provided with a first tooth portion 311, and the inner circumferential surface of the second meshing portion 32 is provided with a second tooth portion 321. The second tooth portion 321 can move along the first direction and be sleeved and meshed with the first tooth portion 311.

[0068] Of course, referring to Figures 5, 7 and 11, in the fifth and seventh embodiments, the first meshing portion 31 and the second meshing portion 32 may be distributed along the axial direction of the first output shaft 13, and the end face of the first meshing portion 31 is provided with a first tooth portion 311, and the end face of the second meshing portion 32 is provided with a second tooth portion 321, and the second tooth portion 321 can move along the first direction and abut and engage with the first tooth portion 311.

[0069] Specifically, please refer to Figures 4 and 8 to 10, wherein the circumferential side surfaces of the second meshing portion 32 in Figures 8 to 10 do not reflect an external spline structure. In the fourth embodiment, the first tooth portion 311 and the second tooth portion 321 are configured as a combined tooth structure, and the second tooth portion 321 is provided with an introduction angle 326, and the extension direction of the introduction angle 326 is arranged to intersect with the axial direction of the second output shaft 23. In this way, the smoothness of the second tooth portion 321 when it is inserted into the first tooth portion 311 can be improved, and the risk of collision damage between the first tooth portion 311 and the second tooth portion 321 can be reduced. The structure of the introduction angle 326 belongs to the mature existing technology in the field of transmissions, so this application will not elaborate on it here.

[0070] Referring to Figures 4 and 5 , in the fourth and fifth embodiments, the first output shaft 13 includes a first shaft section 131 and a second shaft section 132 that are connected to each other. The first shaft section 131 is connected to the first drive unit 10 (i.e., the driven gear of the final stage gear set of the first reduction gear set 12 is disposed on the circumferential side of the first shaft section 131). The second output shaft 23 includes a third shaft section 231. The third shaft section 231 has a mounting cavity 23a for the second shaft section 132 to extend therein, and the first and second gear sections 311, 321 are both disposed within the mounting cavity 23a. In other embodiments, the third shaft section 231 is designed as a special-shaped shaft structure and has a mounting cavity 23a formed therein to accommodate the first and second gear sections 311, 321, thereby protecting the first and second gear sections 311, 321. Of course, in other embodiments, the mounting cavity 23a may be omitted, as in the embodiments shown in Figures 6 or 7 .

[0071] 4 , in the fourth embodiment, the first meshing portion 31 and the second meshing portion 32 are distributed along the radial direction of the first output shaft 13 , the second meshing portion 32 is slidably disposed on the inner side surface of the mounting cavity 23 a , the actuating mechanism 33 is disposed on the third shaft segment 231 , and the first meshing portion 31 is fixedly disposed on the circumferential side surface of the second shaft segment 132 .

[0072] Referring to Figure 4 , in the fourth embodiment, the inner side surface of the mounting cavity 23a is provided with internal splines, while the outer side surface of the second engaging portion 32 is provided with external splines, which are adapted to fit within the internal splines. This structure is simple and easy to implement. Of course, in other embodiments, other methods can be used to achieve the sliding movement of the second engaging portion 32 within the mounting cavity 23a, and this application does not specifically limit this.

[0073] Referring to Figures 4 and 5 , in the fourth and fifth embodiments, the third shaft segment 231 includes a first shell portion 233 and a second shell portion 234 joined together to form a mounting cavity 23a. The second shell portion 234 is positioned adjacent to the first shaft segment 131, and the actuating mechanism 33 is disposed within the first shell portion 233. The separate configurations of the first shell portion 233 and the second shell portion 234 facilitate the formation of the mounting cavity 23a and the installation of the second engaging portion 32 and the actuating mechanism 33 within the mounting cavity 23a. Of course, in other embodiments, the third shaft segment 231 and the mounting cavity 23a may be integrally formed.

[0074] Referring to FIG. 4 , in the fourth embodiment, an inner side surface of the first shell portion 233 is provided with an internal spline, and the outer spline of the second engagement portion 32 is slidably disposed on the inner spline of the first shell portion 233 .

[0075] Of course, the second meshing portion 32 can also be provided on other parts. For example, referring to Figure 5, in the fifth embodiment, the first meshing portion 31 and the second meshing portion 32 are distributed along the axial direction of the first output shaft 13, and the second meshing portion 32 is slidably provided on the circumferential side surface of the second shaft segment 132. The first meshing portion 31 is the second shell portion 234, and the first tooth portion 311 is provided on the end face of the second shell portion 234 close to the mounting cavity 23a.

[0076] Specifically, referring to Figure 5 , in the fifth embodiment, a first flat key 133 is provided on the circumferential side surface of the second shaft segment 132, and a sliding key groove 322 is provided on the second meshing portion 32 corresponding to the first flat key 133. The sliding key groove 322 runs through the opposite end surfaces of the second meshing portion 32, so that the sliding key groove 322 can slide on the first flat key 133 along the first direction. In this way, the structure is simple and easy to implement. It should be noted that the second meshing portion 32 in Figure 11 does not show the structure of the sliding key groove 322, but only shows the structure of the end face teeth. Of course, in other embodiments, other forms can also be used to achieve the sliding of the second meshing portion 32 on the second shaft segment 132, and this application does not specifically limit this.

[0077] Referring to Figures 4 and 5 , in the fourth and fifth embodiments, the power coupling structure 30 further includes an elastic return member 34 disposed within the mounting cavity 23a. The elastic return member 34 connects the second meshing portion 32 and the third shaft segment 231. When the actuating mechanism 33 drives the second meshing portion 32 toward the first meshing portion 31, the elastic deformation of the elastic return member 34 increases. In other words, the elastic return member 34 enables the second meshing portion 32 to return to a position separated from the first meshing portion 31, thereby improving the response speed and reliability of the decoupling action. Of course, in other embodiments, the elastic return member 34 may not be provided.

[0078] Specifically, the elastic return member 34 can be arranged in various ways. For example, referring to Figure 4 , in a fourth embodiment, one end of the elastic return member 34 is connected to a side of the second engaging portion 32 close to the second shell portion 234, and the other end is connected to the second shell portion 234. Referring to Figure 5 , in a fifth embodiment, one end of the elastic return member 34 is connected to a side of the second engaging portion 32 away from the first engaging portion 31, and the other end is connected to the first shell portion 233.

[0079] Referring to Figures 4 and 5 , in the fourth and fifth embodiments, a first bearing 41 is provided on the circumferential side of the first housing portion 233, connecting the first housing portion 233 to the vehicle body via the first bearing 41. A second bearing 42 is provided on the circumferential side of the second housing portion 234, connecting the second housing portion 234 to the vehicle body via the second bearing 42. The driven gear of the final stage gear set of the second reduction gear set is provided on the circumferential side of the first housing portion 233. Thus, the third shaft segment 231 is mounted via the first and second bearings 41, 42, improving its rotational stability and smoothness.

[0080] 4 and 5 , in the fourth and fifth embodiments, the actuating mechanism 33 includes a pin 331 and a driving member. A clearance hole 23b is provided on the bottom wall of the mounting cavity 23a. The first end of the pin 331 passes through the clearance hole 23b and extends into the mounting cavity 23a, and is capable of abutting the second engaging portion 32. The second end of the pin 331 is located outside the mounting cavity 23a and is driven by the driving member.

[0081] Referring to Figures 4 and 5 , in the fourth and fifth embodiments, the actuating mechanism 33 further includes a shift fork 332 movably mounted on the third shaft segment 231 . One end of the shift fork 332 is connected to the driving member, and the other end is connected to the second end of the pin 331 . In one embodiment, the driving member may be a linear motor, a pneumatic cylinder, a hydraulic cylinder, or the like. That is, the shift fork 332 achieves mechanical transmission, transmitting the driving member's force to the pin 331 and causing the pin 331 to move in the first direction. This structure is simple and easy to implement. When the shift fork 332 is reset, the elastic potential energy accumulated by the elastic reset member 34 resets the second engaging portion 32 and the pin 331, placing the power coupling structure 30 in a decoupled state. It should be noted that the mating structure of the shift fork 332 and the driving member in this embodiment can refer to the prior art shift fork 332 structure used in vehicle transmissions. Since such solutions are relatively mature, this application will not elaborate further here.

[0082] Of course, other driving methods can also be used. For example, in other embodiments, the driving member includes an electromagnet, and the material of the pin 331 is configured as a magnetic material such as neodymium iron boron. When the electromagnet is energized, it can generate a repulsive force on the pin 331, and prompt the pin 331 to push the second engaging portion 32 to engage with the first engaging portion 31, so that the power coupling structure 30 enters a coupled state; when the electromagnet is de-energized, the repulsive force on the pin 331 can be cancelled, and the elastic reset member 34 can be used to prompt the second engaging portion 32 to disengage from the first engaging portion 31.

[0083] 6 and 7 , in the sixth and seventh embodiments, the first output shaft 13 includes a first shaft segment 131 and a second shaft segment 132 connected to each other, the first shaft segment 131 is connected to the first drive unit 10, the second output shaft 23 includes a third shaft segment 231 and a fourth shaft segment 232, the third shaft segment 231 is connected to the second drive unit 20, the second shaft segment 132 and the fourth shaft segment 232 are oppositely and adjacently arranged, one of the second shaft segment 132 and the fourth shaft segment 232 is provided with a second meshing portion 32, and the other is provided with a first meshing portion 31.

[0084] Referring to Figure 6 , in the sixth embodiment, the first and second meshing portions 31, 32 are radially distributed along the first output shaft 13. The second meshing portion 32 is provided with a first internal spline 323 and a second internal spline 324 spaced apart along the first direction. The first meshing portion 31 is provided with a first external spline 312 corresponding to the first internal spline 323, and the second shaft segment 132 is provided with a second external spline 134 corresponding to the second internal spline 324. The second external spline 134 is slidably sleeved over the second internal spline 324. The first external spline 312 is a first tooth portion 311, and the first internal spline 323 is a second tooth portion 321. This structure is simple and easy to implement, and facilitates the installation of the second meshing portion 32 on the second shaft segment 132 and the fourth shaft segment 232. Of course, in other embodiments, other methods can be used to achieve the sliding movement of the second meshing portion 32 on the second shaft segment 132, and this application does not specifically limit this.

[0085] Referring to FIG. 6 , in the sixth embodiment, the fourth shaft segment 232 is provided with a shaft lumen 23c, and a support step 135 is provided at the end of the second shaft segment 132. The support step 135 at least partially extends into the shaft lumen 23c. The power drive system further includes a third bearing 43 disposed between the inner side of the shaft lumen 23c and the support step 135. Thus, the support step 135 supports the fourth shaft segment 232, and the third bearing 43 enables the second shaft segment 132 to rotate freely relative to the fourth shaft segment 232 when the power coupling structure 30 is in the decoupled state. Of course, the support step 135 and the third bearing 43 may also be omitted, with the second shaft segment 132 and the fourth shaft segment 232 spaced apart in the first direction, as shown in the embodiment of FIG. 7 .

[0086] Referring to Figure 7 , in the seventh embodiment, the second shaft segment 132 and the fourth shaft segment 232 are spaced apart in the first direction. The first meshing portion 31 and the second meshing portion 32 are distributed along the axial direction of the first output shaft 13. The second meshing portion 32 is slidably disposed on the circumferential side surface of the second shaft segment 132, while the first meshing portion 31 is fixedly disposed on the circumferential side surface of the fourth shaft segment 232. In one embodiment, the second meshing portion 32 is also slidably disposed on the circumferential side surface of the second shaft segment 132 using a spline connection. Of course, in other embodiments, other methods can be used to achieve the sliding movement of the second meshing portion 32 on the second shaft segment 132, and this application is not specifically limited thereto.

[0087] Referring to Figures 6 and 7 , in the sixth and seventh embodiments, the actuating mechanism 33 includes a push-pull member 333 and a driving member. The second engaging portion 32 is provided with a force-bearing groove 325 corresponding to the push-pull member 333. The first end of the push-pull member 333 is inserted into the force-bearing groove 325, while the second end of the push-pull member 333 is exposed outside the force-bearing groove 325 and driven by the driving member. This structure is simple and easy to implement, and facilitates installation of the actuating mechanism 33.

[0088] In the sixth and seventh embodiments, the driving member may be a linear motor, a pneumatic cylinder, a hydraulic cylinder, or the like. That is, the cooperative structure of the push-pull member 333 and the force-bearing groove 325 can transmit the displacement of the telescopic rod of the linear motor to the second engaging portion 32, thereby causing the second engaging portion 32 to move toward or away from the first engaging portion 31 along the first direction. This structure is simple and easy to implement.

[0089] Of course, the push-pull member 333 can also be configured as a fork 332, that is, the fork 332 is used to indirectly transmit the force and displacement of the driving member to the second engaging portion 32; the push-pull member 333 can also be driven to move by an electromagnet. For related solutions, please refer to the fourth and fifth embodiments above, which will not be elaborated here.

[0090] The present application also proposes a chassis structure, which includes the aforementioned power drive system. The specific structure of the power drive system refers to the above-mentioned embodiment. Since this chassis structure adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0091] The present application also proposes a vehicle, which includes the aforementioned power drive system. The specific structure of the power drive system refers to the above-mentioned embodiment. Since the present vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0092] The vehicle includes a body, a first drive wheel, a second drive wheel, and the aforementioned power drive system. The first drive wheel and the second drive wheel are arranged on opposite sides of the body. The first output shaft of the power drive system is connected to the first drive wheel, and the second output shaft is connected to the second drive wheel.

[0093] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A power drive system, comprising: A drive unit, including a first drive unit and a second drive unit, the first drive unit having a first output shaft, and the second drive unit having a second output shaft; And A power coupling structure disposed between the first drive unit and the second drive unit, the power drive system having a first mode and a second mode. In the first mode, the first drive unit independently drives the first output shaft and the second drive unit independently drives the second output shaft; In the second mode, the first drive unit is linked with the second drive unit through the power coupling structure, so that the power of the first drive unit and the second drive unit is centrally output through the first output shaft or the second output shaft.

2. The power drive system according to claim 1, wherein, The power coupling structure is disposed between the first output shaft and the second output shaft. In the second mode, the first output shaft is linked with the second output shaft through the power coupling structure.

3. The power drive system according to claim 2, wherein, The axis of the first output shaft extends along a first direction. The power coupling structure includes a first engaging portion, a second engaging portion, and an actuating mechanism. In the first direction, the first engaging portion is fixed relative to the drive unit, and the second engaging portion moves relative to the drive unit. The actuating mechanism at least urges the second engaging portion to approach and engage with the first engaging portion; one of the first engaging portion and the second engaging portion is disposed on the first output shaft, and the other is disposed on the second output shaft.

4. The power drive system according to claim 3, wherein, The first engaging portion and the second engaging portion are distributed radially along the first output shaft. The outer peripheral surface of the first engaging portion is provided with a first tooth portion, and the inner peripheral surface of the second engaging portion is provided with a second tooth portion. The second tooth portion moves along the first direction and is sleeved and engaged with the first tooth portion; Alternatively, the first engaging portion and the second engaging portion are distributed axially along the first output shaft. The end surface of the first engaging portion is provided with a first tooth portion, and the end surface of the second engaging portion is provided with a second tooth portion. The second tooth portion moves along the first direction and abuts and engages with the first tooth portion.

5. The power drive system according to claim 4, wherein, The first output shaft includes a first shaft segment and a second shaft segment connected to each other. The first shaft segment is connected to the first drive unit. The second output shaft includes a third shaft segment, and the third shaft segment is provided with an installation cavity for the second shaft segment to extend into. The first tooth portion and the second tooth portion are both disposed in the installation cavity.

6. The power drive system according to claim 5, wherein The first engaging portion and the second engaging portion are distributed radially along the first output shaft. The second engaging portion is slidably disposed on the inner side surface of the installation cavity, the actuating mechanism is disposed on the third shaft segment, and the first engaging portion is fixedly disposed on the circumferential side surface of the second shaft segment.

7. The power drive system according to claim 5, wherein, The third shaft segment includes a first housing portion and a second housing portion spliced together. The first housing portion and the second housing portion jointly enclose the installation cavity. The second housing portion is disposed close to the first shaft segment, and the actuating mechanism is disposed in the first housing portion.

8. The power drive system according to claim 7, wherein The first meshing portion and the second meshing portion are distributed along the axial direction of the first output shaft, the second meshing portion is slidably arranged on the circumferential side surface of the second shaft segment, the first meshing portion is the second shell portion, and the first tooth portion is arranged on the end surface of the second shell portion close to the mounting cavity.

9. The power drive system according to claim 5, wherein, The power coupling structure also includes an elastic return member arranged in the installation cavity, the elastic return member connects the second meshing portion and the third shaft segment, and when the actuating mechanism drives the second meshing portion to approach the first meshing portion, the elastic deformation of the elastic return member increases.

10. The power drive system according to claim 5, wherein The actuating mechanism includes a pin shaft and a driving member. The bottom wall of the mounting cavity is provided with a clearance hole. The first end of the pin shaft passes through the clearance hole and extends into the mounting cavity and abuts against the second engaging portion. The second end of the pin shaft is located outside the mounting cavity and is driven by the driving member.

11. The power drive system according to claim 10, wherein, The actuating mechanism further comprises a shift fork movably arranged on the third shaft section, one end of the shift fork is connected to the driving member, and the other end of the shift fork is connected to the second end of the pin shaft; Alternatively, the driving member includes an electromagnet, and the pin shaft is made of a magnetic material. When the electromagnet is energized, a repulsive force is generated on the pin shaft, and the pin shaft is urged to push the second engaging portion to engage with the first engaging portion.

12. The power drive system according to claim 4, wherein, The first output shaft includes a first shaft segment and a second shaft segment connected to each other, the first shaft segment is connected to the first drive unit, the second output shaft includes a third shaft segment and a fourth shaft segment, the third shaft segment is connected to the second drive unit, the second shaft segment and the fourth shaft segment are arranged opposite to each other, one of the second shaft segment and the fourth shaft segment is provided with the second meshing portion, and the other is provided with the first meshing portion.

13. The power drive system according to claim 12, wherein, The first meshing portion and the second meshing portion are distributed along the radial direction of the first output shaft, the second meshing portion is provided with a first internal spline and a second internal spline at intervals along the first direction, the first meshing portion is provided with a first external spline corresponding to the first internal spline, the second shaft section is provided with a second external spline corresponding to the second internal spline, and the second external spline is slidably sleeved on the second internal spline; the first external spline is the first tooth portion, and the first internal spline is the second tooth portion; And / or, the second shaft segment and the fourth shaft segment are spaced apart in the first direction, the first meshing portion and the second meshing portion are distributed along the axial direction of the first output shaft, the second meshing portion is slidably arranged on the circumferential side surface of the second shaft segment, and the first meshing portion is fixedly arranged on the circumferential side surface of the fourth shaft segment; And / or, the actuating mechanism includes a push-pull member and a driving member, the second engaging portion is provided with a force groove corresponding to the push-pull member, the first end of the push-pull member is inserted into the force groove, the second end of the push-pull member is exposed outside the force groove and is driven by the driving member.

14. A chassis structure comprising a power drive system as claimed in any one of claims 1 to 13.

15. A vehicle, comprising the power drive system according to any one of claims 1 to 13, or comprising the chassis structure according to claim 14.

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