CN106553528B

CN106553528B - Power driving system and vehicle with same

Info

Publication number: CN106553528B
Application number: CN201510622164.2A
Authority: CN
Inventors: 杨冬生; 廉玉波; 张金涛; 罗红斌
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2015-09-25
Filing date: 2015-09-25
Publication date: 2020-08-25
Anticipated expiration: 2035-09-25
Also published as: CN106553528A

Abstract

The invention discloses a power driving system and a vehicle. The power drive system includes: the differential mechanism comprises an input part, a first planet carrier, a second planet carrier, a first planet wheel, a second planet wheel, a first gear ring and a second gear ring, wherein the first planet wheel and the second planet wheel are respectively connected with the first planet carrier and the second planet carrier; a power output shaft configured to be linked with the input portion; a plurality of input shafts, each input shaft being arranged to be linked with the power output shaft; and a first motor generator which is linked with one of the input shafts. The differential mechanism of the power driving system realizes the differential function by utilizing the planetary differential principle, and has compact and simple structure.

Description

Power driving system and vehicle with same

Technical Field

The invention relates to a power driving system for a vehicle and the vehicle with the power driving system.

Background

In one of the differential technologies known to the inventor, the differential includes a driven gear of a main reducer (main reducer driven gear), a planetary gear, a central wheel, etc., the planetary gear is mounted on an auxiliary plate of the driven gear through a square shaft and a shaft sleeve and is meshed with the central wheel, the rotating and moving functions of the planetary gear are realized by a rotating pair and a plane moving pair, and the central wheel is connected with a left half shaft and a right half shaft through an angular positioning pin and a cylindrical pair or a spline, so as to achieve the purpose of outputting torque. The differential eliminates the original components such as left and right shells, planetary gear shafts and the like of the differential, and directly installs the planetary gear on the auxiliary plate of the driven gear of the main reducer by using a square shaft and a shaft sleeve, thereby effectively reducing the number of parts of the differential, simplifying the structure and lightening the weight.

However, the differential mechanism utilizes a symmetrical bevel gear structure to realize inter-wheel differential, is only a partial innovation of the traditional symmetrical bevel gear differential mechanism, and cannot really solve the defects of overlarge axial size, large mass of a shell and a bevel gear and relative reliability deviation of the differential mechanism.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art.

Therefore, the differential mechanism of the power driving system realizes the differential function by utilizing the planetary differential principle, and has compact and simple structure.

The invention also provides a vehicle with the power transmission system.

A power drive system according to an embodiment of the present invention includes: the differential mechanism comprises a first planet carrier, a first planet wheel, a first gear ring, a second planet carrier, a second planet wheel, a second gear ring and an input part, wherein the first planet wheel is connected with the first planet carrier, the first planet wheel is meshed with the first gear ring, the second planet wheel is connected with the second planet carrier, the second planet wheel is meshed with the second gear ring, the second planet wheel is further meshed with the first planet wheel, the first gear ring and the second gear ring form two power output ends of the differential mechanism, the input part, the first planet carrier and the second planet carrier are coaxially arranged, and the input part is respectively linked with the first planet carrier and the second planet carrier; a power output shaft configured to be linked with the input portion; a plurality of input shafts, each of the input shafts being provided in linkage with the power output shaft; a first motor generator operatively coupled to one of the plurality of input shafts.

The differential mechanism of the power driving system according to the embodiment of the invention realizes the differential function by utilizing the planetary differential principle, and has compact and simple structure.

In addition, the power driving system according to the embodiment of the invention may also have the following additional technical features:

according to some embodiments of the invention, the power drive system further comprises: an engine configured to selectively engage at least one of the plurality of input shafts.

According to some embodiments of the invention, the power take-off shaft is provided with a power take-off shaft output gear, and the power take-off shaft output gear is in meshing transmission with the input part.

According to some embodiments of the invention, the power take-off shaft output gear and the input constitute a final drive, wherein the power take-off shaft output gear is configured as a final drive gear and the input is configured as a final drive driven gear.

According to some embodiments of the invention, the input shaft and the power output shaft are driven by a range gear pair.

According to some embodiments of the present invention, a plurality of fixed driven gears are fixedly disposed on the power output shaft, and a fixed driving gear is fixedly disposed on each of the input shafts, and the fixed driven gears are engaged with the corresponding fixed driving gears.

According to some embodiments of the invention, the plurality of input shafts comprises:

first input shaft and second input shaft, the second input shaft is established the axle sleeve is established on the first input shaft, fixed driving gear includes: fix the first fixed driving gear on first input shaft and fix the fixed driving gear of second on the second input shaft, fixed driven gear includes: the first fixed driven gear is meshed with the first fixed driving gear, and the second fixed driven gear is meshed with the second fixed driving gear.

According to some embodiments of the invention, the power drive system further comprises:

an engine; and

a dual clutch, the dual clutch comprising: the engine includes a first engagement portion, a second engagement portion, and a third engagement portion configured to selectively engage at least one of the first engagement portion and the second engagement portion, the engine being coupled to the third engagement portion, the first input shaft being coupled to the first engagement portion, the second input shaft being coupled to the second engagement portion.

According to some embodiments of the invention, the first motor generator is linked with the first fixed driving gear or the second fixed driving gear through a gear structure.

According to some embodiments of the invention, the first planet wheel partially overlaps the second planet wheel in the axial direction.

According to some embodiments of the invention, the power drive system further comprises: a second motor generator that is linked with the first ring gear, and a third motor generator that is linked with the second ring gear.

According to some embodiments of the present invention, the first ring gear is provided with first external teeth on an outer peripheral surface thereof, the second ring gear is provided with second external teeth on an outer peripheral surface thereof, the second motor generator is linked with the first external teeth, and the third motor generator is linked with the second external teeth.

According to some embodiments of the invention, the transmission comprises a first input shaft, a second input shaft and a third input shaft, the third input shaft is sleeved on the second input shaft, the second input shaft is sleeved on the first input shaft, and the engine is connected with the first input shaft, the second input shaft and the third input shaft through three clutches.

According to some embodiments of the invention, the first planet comprises: a first tooth and a second tooth, the second planet comprising: the first tooth part is meshed with the first gear ring, the second tooth part and the third tooth part are correspondingly overlapped and meshed in the axial direction, and the fourth tooth part is meshed with the second gear ring.

According to some embodiments of the invention, the first planet gear and the second planet gear are both cylindrical gears.

According to some embodiments of the invention, the first gear ring and the second gear ring are of a symmetrical structure, each of the first gear ring and the second gear ring comprising:

the main part flat board portion with set up the annular side wall portion of the periphery edge of main part flat board portion, be provided with a plurality of teeth on the internal face of annular side wall portion, main part flat board portion with inject the cavity between the annular side wall portion, the cavity of first ring gear with the cavity orientation of second ring gear is in order to constitute installation space each other, first planet carrier with first planet wheel and the second planet carrier with the second planet wheel is accomodate in the installation space.

According to some embodiments of the invention, the input portion is configured as an input gear configured as a ring and sleeved over the first and second ring gear outer surfaces.

According to some embodiments of the invention, a gap is provided between the first ring gear and the second ring gear, the input gear surrounding and covering the gap.

According to some embodiments of the invention, the power drive system further comprises: an intermediate connection structure for connecting the first and second carriers to the input portion, the intermediate connection structure including: a first connecting bracket for connecting the first planet carrier with the input portion, and a second connecting bracket for connecting the second planet carrier with the input portion, wherein each of the first and second connecting brackets includes:

the extension arm parts are arranged on the outer peripheral surface of the central body part, are radially distributed by taking the central body part as the center, and are used for being connected with the input part.

According to some embodiments of the invention each of said first planet wheels is provided with a first planet wheel axle, both ends of said first planet wheel axle being connected to said first planet carrier and said second planet carrier, respectively, and each of said second planet wheels is provided with a second planet wheel axle, both ends of said second planet wheel axle being connected to said first planet carrier and said second planet carrier, respectively.

According to some embodiments of the invention, the first planet gear has a revolution radius that is the same as a revolution radius of the second planet gear.

According to some embodiments of the invention, the first gear ring is linked with a left front wheel and the second gear ring is linked with a right front wheel;

the power drive system further includes:

a fourth motor generator linked with the left rear wheel and a fifth motor generator linked with the right rear wheel; and

an anti-skid synchronizer configured to selectively synchronize the left and right rear wheels such that the left and right rear wheels rotate in synchronization.

The vehicle according to the embodiment of the invention comprises the power driving system of the embodiment.

Drawings

FIG. 1 is an exploded view of a differential according to an embodiment of the present invention;

FIG. 2 is an exploded view from another perspective of a differential according to an embodiment of the present invention;

FIG. 3 is a perspective view of a differential according to an embodiment of the present invention;

FIG. 4 is a schematic plan view of a differential according to an embodiment of the present invention;

fig. 5 is a perspective view of the differential according to the embodiment of the invention, in which the second carrier and the second ring gear, etc. are not shown;

FIG. 6 is a schematic of the engagement of a first planet and a second planet;

fig. 7 is a schematic view of the meshing principle of the first planet wheel and the second planet wheel;

FIG. 8 is a perspective view of the first gear ring or the second gear ring according to an embodiment of the present invention;

FIG. 9 is a perspective view of a first ring gear or a second ring gear according to still other embodiments of the present invention;

FIG. 10 is a schematic illustration of a power drive system according to one embodiment of the present invention;

FIG. 11 is a schematic illustration of a power drive system according to another embodiment of the present invention;

FIG. 12 is a schematic illustration of a power drive system according to yet another embodiment of the present invention;

FIG. 13 is a schematic illustration of a power drive system according to yet another embodiment of the present invention;

FIG. 14 is a schematic illustration of a power drive system according to yet another embodiment of the present invention;

FIG. 15 is a schematic illustration of a power drive system according to yet another embodiment of the present invention;

FIG. 16 is a schematic illustration of a power drive system according to yet another embodiment of the present invention;

FIG. 17 is a schematic illustration of a power drive system according to yet another embodiment of the present invention;

FIG. 18 is a schematic illustration of a power drive system according to yet another embodiment of the present invention;

FIG. 19 is a schematic illustration of a power drive system according to yet another embodiment of the present invention;

fig. 20 is a schematic diagram of a vehicle according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

A power drive system 1000 according to an embodiment of the present invention, which power drive system 1000 is applicable to a vehicle, will be described in detail below with reference to the accompanying drawings.

As shown in fig. 10 to 15, a power drive system 1000 according to some embodiments of the present invention mainly includes a differential 100, a transmission 104, and a first motor generator 401, the transmission 104 being connected between the differential 100 and the first motor generator 401.

The specific structure of differential 100 will first be described in detail with respect to the illustrated embodiment, and other configurations of power drive system 1000 will be described after a detailed description of the construction of differential 100.

The differential 100 according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 9, wherein the differential 100 can be used for an inter-wheel differential or an inter-axle differential, for example, the inter-wheel differential, and the differential 100 can enable left and right driving wheels to roll at different angular velocities when the vehicle is running in a curve or on an uneven road surface, so as to ensure that the driving wheels on both sides make a pure rolling motion with the ground.

As shown in fig. 1, a differential 100 according to an embodiment of the present invention is composed of an input portion 3, a first carrier 11, first planet gears 12, and a first ring gear 13, and a second carrier 21, second planet gears 22, and a second ring gear 23.

In conjunction with the embodiments of fig. 1 and 2, each of the first carrier 11 and the second carrier 21 may be configured as a circular plate-like structure, which may reduce the axial dimension of the differential 100 to some extent. In some embodiments, the first planet carrier 11 and the second planet carrier 21 may be a split structure, and since a single small component is relatively easy to form, the separate machining of the first planet carrier 11 and the second planet carrier 21 may simplify the manufacturing process and improve the machining precision.

As shown in fig. 1 to 2 in conjunction with fig. 6, the first planetary gears 12 are arranged on the first carrier 11, for example, each first planetary gear 12 has a first planetary gear shaft 14, both ends of the first planetary gear shaft 14 are rotatably supported on the first carrier 11 and the second carrier 21, respectively, for example, both ends of the first planetary gear shaft 14 can be rotatably supported in corresponding shaft holes of the first carrier 11 and the second carrier 21 by bearings, and the first planetary gears 12 can be fixed on the corresponding first planetary gear shafts 14. Of course, both ends of the first planet carrier shaft 14 and the first planet carrier 11 and the second planet carrier 21 may also be fixedly connected, for example, both ends of the first planet carrier shaft 14 are respectively welded and fixed with the corresponding shaft holes of the first planet carrier 11 and the second planet carrier 21, at this time, the first planet gears 12 are rotatably sleeved on the corresponding first planet carrier shaft 14, for example, the first planet gears 12 can be rotatably sleeved on the first planet carrier shaft 14 through bearings. Thus, the first planet carrier 11 and the second planet carrier 21 can be connected through the first planet carrier shaft 14, so that the first planet carrier 11 and the second planet carrier 21 keep moving at the same speed and in the same direction (namely, the first planet carrier 11 and the second planet carrier 21 are linked), and in the connection mode, the first planet carrier 11 and the second planet carrier 21 can well support/fix the first planet carrier shaft 14, and the first planet carrier shaft 14 is prevented from being disconnected from a single planet carrier, so that the differential 100 fails. Referring to fig. 1 and 2, the first planetary gears 12 are engaged with the first ring gear 13, and may be embodied in an inner-meshing manner, that is, the first planetary gears 12 are located inside the first ring gear 13 and are meshed with teeth on the first ring gear 13. The first planetary gears 12 are preferably plural and equally spaced in the circumferential direction inside the first ring gear 13, for example, as a preferred embodiment, the number of the first planetary gears 12 may be three, and any two adjacent first planetary gears 12 are spaced apart by an angle of 120 °.

As shown in fig. 1-2 and in conjunction with fig. 6, the second planetary gears 22 are arranged on the second planetary gear carrier 21, for example, each second planetary gear 22 has a second planetary gear shaft 24, for example, both ends of the second planetary gear shaft 24 can be rotatably supported by bearings in the shaft holes of the first planetary gear carrier 11 and the second planetary gear carrier 21 corresponding to each other, and the second planetary gears 22 can be fixed on the corresponding second planetary gear shafts 24. Of course, both ends of the second planetary gear shaft 24 and the first and second

planetary gear carriers

11 and 21 may also be fixedly connected, for example, both ends of the second planetary gear shaft 24 are respectively welded and fixed with the corresponding shaft holes of the first and second

planetary gear carriers

11 and 21, at this time, the second planetary gear 22 is rotatably sleeved on the corresponding second planetary gear shaft 24, for example, the second planetary gear 22 may be rotatably sleeved on the second planetary gear shaft 24 through a bearing. Therefore, the purpose of connecting the first planet carrier 11 and the second planet carrier 21 can be achieved through the second planet carrier shaft 24, so that the first planet carrier 11 and the second planet carrier 21 keep moving at the same speed and in the same direction, and by adopting the connection mode, the first planet carrier 11 and the second planet carrier 21 can well support/fix the second planet carrier shaft 24, and the second planet carrier shaft 24 is prevented from being disconnected with a single planet carrier to cause the failure of the differential 100.

Furthermore, in other embodiments of the present invention, in order to keep the first planet carrier 11 and the second planet carrier 21 capable of moving at the same speed and in the same direction, not only the above-mentioned manner of connecting the first planet carrier 11 and the second planet carrier 21 through the first planet shaft 14 and/or the second planet shaft 24 can be adopted, but also the first planet carrier 11 and the second planet carrier 21 can be directly fixedly connected through the intermediate connection structure 6, or the planet shafts and the intermediate connection structure 6 can be adopted to connect the first planet carrier 11 and the second planet carrier 21, and the specific configuration of the intermediate connection structure 6 will be described in detail below.

Referring to fig. 1 and 2, the second planetary gear 22 is meshed with the second ring gear 23, and may be in an inner meshing manner, that is, the second planetary gear 22 is located inside the second ring gear 23 and is meshed with teeth on the second ring gear 23. The second planetary gears 22 are preferably plural and equally spaced in the circumferential direction inside the second ring gear 23, for example, as a preferred embodiment, the number of the second planetary gears 22 may be three, and any two adjacent second planetary gears 22 are spaced by an angle of 120 °.

It should be noted that fig. 4 is a schematic plan view of a differential 100 according to an embodiment of the present invention, in which the meshing relationship between the first planetary gear 12 and the second planetary gear 22 and the meshing relationship between the first planetary gear 12 and the first ring gear 13 and between the second planetary gear 22 and the second ring gear 23 are schematically shown, and since fig. 4 is a plan view and the three meshing relationships are shown at the same time, the relative positional relationship among the components is only schematic and does not show or imply the actual spatial arrangement positions of the components.

In the embodiment where the first planetary gear 12 and the second planetary gear 22 are both plural, it is preferable that the plural first planetary gears 12 and the plural second planetary gears 22 are respectively engaged correspondingly. For example, as shown in fig. 1, 2 and 5, if the first planet wheel 12 and the second planet wheel 22 are three, the first planet wheel 12 can be meshed with the corresponding first second planet wheel 22, the second first planet wheel 12 can be meshed with the corresponding second planet wheel 22, and the third first planet wheel 12 can be meshed with the corresponding third second planet wheel 22, so that there are multiple sets of first planet wheels 12 and second planet wheels 22 meshed with each other, and when the differential 100 transmits power, the power is transmitted between the multiple sets of first planet wheels 12 and second planet wheels 22 meshed with each other more stably and reliably.

In this regard, referring to the embodiment of fig. 4, the revolution axis O of the first planet wheel 12 coincides with the revolution axis O of the second planet wheel 22, and the revolution radii of the first planet wheel 12 and the second planet wheel 22 (i.e., the distances of the central axes of the planet wheels from the revolution axis O) are the same.

In particular, as shown in fig. 1-2, 4-7, the first planet gears 12 are in meshing engagement with the second planet gears 22. In other words, for the first planet wheel 12, it meshes not only with the first ring gear 13, but also with the second planet wheel 22, and for the second planet wheel 22, it meshes not only with the second ring gear 23, but also with the first planet wheel 12.

As shown in fig. 1-4, the first ring gear 13 and the second ring gear 23 may form two power output ends of the differential 100, and the first planet carrier 11 and the second planet carrier 21 correspond to power input ends of the differential 100, for example, in one embodiment of the present invention, the first planet carrier 11 and the second planet carrier 21 are linked with the input part 3, in other words, the motion states of the input part 3, the first planet carrier 11 and the second planet carrier 21 are the same (i.e., the same speed and the same direction). As a preferred embodiment, the input 3, the first carrier 11 and the second carrier 21 are arranged coaxially. Thus, the power output from the external power source can be input from the input portion 3, and can be output from the first ring gear 13 and the second ring gear 23, respectively, after the differential action of the differential 100.

The operation principle of the differential 100 will be briefly described by taking the differential 100 applied to the inter-wheel differential as an example, at this time, the first gear ring 13 may be connected to a left half shaft, the left half shaft may be connected to a left wheel, the second gear ring 23 may be connected to a right half shaft, the right half shaft may be connected to a right wheel, the power output by the power source such as the engine and/or the motor may be output to the input portion 3 through the speed reduction function of the main speed reducer, and the input portion 3 drives the first planet carrier 11 and the second planet carrier 21 to rotate synchronously. If the vehicle runs on a flat road surface and does not turn, the left wheel and the right wheel theoretically rotate at the same speed, the differential mechanism 100 does not play a role in differential speed at the moment, the first planet carrier 11 and the second planet carrier 21 rotate at the same speed and in the same direction, the first gear ring 13 and the second gear ring 23 rotate at the same speed and in the same direction, and the first planet wheel 12 and the second planet wheel 22 only revolve and do not rotate. If the vehicle runs on an uneven road or turns, the left wheel and the right wheel theoretically have different rotating speeds, the rotating speeds of the first gear ring 13 and the second gear ring 23 are also different, namely, a rotating speed difference exists, at the moment, the first planet wheel 12 and the second planet wheel 22 rotate while revolving, the rotation of the first planet wheel 12 and the second planet wheel 22 can accelerate one of the first gear ring 13 and the second gear ring 23 and decelerate the other one of the first gear ring and the second gear ring 23, and the rotating speed difference between the accelerated gear ring and the decelerated gear ring is the rotating speed difference between the left wheel and the right wheel, so that the differential action is realized.

In summary, the differential 100 according to the embodiment of the present invention utilizes the planetary differential principle, and has higher space utilization rate, smaller axial dimension, and more advantages in terms of production and assembly in terms of structure and connection form. Such structural style not only can avoid the axial and radial size defects of the bevel gear, but also can better utilize the hollow space inside the driving and driven gear, thereby realizing better space utilization rate, greatly facilitating the whole vehicle arrangement of the differential mechanism 100 assembly and the limitation of the weight, and simultaneously having higher reliability and better transmission efficiency, being beneficial to improving the reliability of a power transmission chain and the power output fluency during the bending, and having higher practicability compared with the symmetrical bevel gear differential mechanism.

The meshing relationship of the first planetary gear 12 and the second planetary gear 22 will be described in detail below with reference to specific embodiments.

Referring to fig. 1-2 in conjunction with fig. 6-7, the first planet gear 12 and the second planet gear 22 partially overlap in the axial direction (left-right direction in fig. 6-7), that is, the first planet gear 12 and the second planet gear 22 only partially overlap, and the other parts are offset, so that the overlapping parts of the first planet gear 12 and the second planet gear 22 can mesh with each other, and the offset parts can mesh with the respective ring gears.

Specifically, as shown in fig. 6 and 7, the first planet gear 12 may include a first tooth portion 151 and a second tooth portion 152 (with a dashed line K2 in fig. 7 as a boundary line), the second planet gear 22 may include a third tooth portion 153 and a fourth tooth portion 154 (with a dashed line K1 in fig. 7 as a boundary line), the second tooth portion 152 and the third tooth portion 153 form an overlapping portion, that is, the second tooth portion 152 and the third tooth portion 153 are axially overlapped and meshed with each other, the first tooth portion 151 and the fourth tooth portion 154 are axially offset and meshed with the respective corresponding ring gears, that is, the first tooth portion 151 is meshed with the first ring gear 13, and the fourth tooth portion 154 is meshed with the second ring gear 23.

Therefore, the axial size of the differential 100 is more compact, and the volume of the differential 100 is smaller, which is beneficial to the installation and arrangement of the differential 100.

According to some embodiments of the invention, the number of teeth of the first ring gear 13 is equal to the number of teeth of the second ring gear 23, and the number of teeth of the first planet gear 12 is equal to the number of teeth of the second planet gear 22.

According to some embodiments of the present invention, the first planet gears 12 and the second planet gears 22 are cylindrical gears, and the differential 100 using cylindrical gears is more compact than a conventional symmetrical bevel gear differential, and in particular, has a higher space utilization rate in structure and connection form, a smaller axial size, and is more advantageous in production and assembly.

The structure of the first ring gear 13 and the second ring gear 23 will be described in detail below with reference to specific embodiments.

In some embodiments of the present invention, the first gear ring 13 and the second gear ring 23 are of a symmetrical structure, in other words, the first gear ring 13 and the second gear ring 23 are symmetrically arranged, which can increase the versatility of the gear rings and reduce the cost.

Specifically, as shown in fig. 1 to 2, each of the first ring gear 13 and the second ring gear 23 includes: the main body flat plate portion 161 and the annular side wall portion 162 provided at the outer peripheral edge of the main body flat plate portion 161 may be integrally molded components. A plurality of gear teeth are provided on the inner wall surface of the annular side wall portion 162, cavities a1, a2 are defined between the main body flat plate portion 161 and the annular side wall portion 162, that is, a cavity a1 is defined between the main body flat plate portion 161 and the annular side wall portion 162 of the first ring gear 13, a cavity a2 is defined between the main body flat plate portion 161 and the annular side wall portion 162 of the second ring gear 23 (see fig. 4), the cavity a1 in the first ring gear 13 and the cavity a2 in the second ring gear 23 face each other to constitute an installation space a (see fig. 4), wherein the first planet carrier 11 and the first planet wheels 12 and the second planet carrier 21 and the second planet wheels 22 are received in the installation space a, this allows the differential 100 to be relatively more compact, occupy less space, be easier to deploy, meanwhile, the first gear ring 13 and the second gear ring 23 serve as the outer shell, a planet carrier and a planet gear which are contained in the outer shell can be protected, and the service life is prolonged. In addition, the installation space a defined by the first gear ring 13 and the second gear ring 23 is relatively closed, and external impurities are not easy to enter the installation space a to influence moving parts, so that the stable operation of the differential 100 is ensured.

The specific configuration of the input section 3 is described in detail below with reference to specific embodiments.

According to some embodiments of the invention, the input 3 is configured as an input gear. Further, as shown in fig. 1 to 3, the input gear 3 is configured in a ring shape (the teeth of the input gear 3 are formed on the outer peripheral surface) and is fitted over the outer surfaces of the first ring gear 13 and the second ring gear 23, and it is understood that the inner diameter of the input gear 3 may be sized larger than the outer diameters of the first ring gear 13 and the second ring gear 23, so that the components inside the two ring gears are not exposed by fitting the input gear 3 over the outside of the first ring gear 13 and the second ring gear 23, thereby protecting the components inside the ring gears.

As shown in fig. 4, the first ring gear 13 and the second ring gear 23 are provided with a gap D in the axial direction, that is, the first ring gear 13 and the second ring gear 23 are spaced apart from each other in the axial direction and do not closely adhere to each other. Since the width of the meshing portion of the first planetary gear 12 and the second planetary gear 22 determines the size of the gap D to some extent (in addition, the thickness of the extension arm 63 may also determine the gap D, which will be described below, and it is first described that the width of the meshing portion of the two planetary gears 22 determines the gap D), that is, the width of the meshing portion of the first planetary gear 12 and the second planetary gear 22 may be equal to the minimum value of the gap D, the size of the gap D may be indirectly controlled by controlling the width of the meshing portion of the first planetary gear 12 and the second planetary gear 22, and for those skilled in the art, the width of the meshing portion of the first planetary gear 12 and the second planetary gear 22 may be set relatively narrow on the premise of ensuring stable power transmission of the first planetary gear 12 and the second planetary gear 22 and the service life of the first planetary gear 12 and the second planetary gear 22, this effectively reduces the clearance D, resulting in a smaller, more compact axial dimension of the differential 100, and easier layout.

Further, the input gear 3 surrounds and covers the gap D. Therefore, the installation space A is better in sealing performance, external sundries are more difficult to enter the installation space A to influence moving parts, stable operation of the differential mechanism 100 is further guaranteed, and meanwhile the axial space and the radial space of the differential mechanism can be saved at least to a certain extent.

In a preferred embodiment, the input gear 3 is a final drive driven gear. Therefore, the hollow space in the driving reduction driven gear can be better utilized, the better space utilization rate is realized, and the whole vehicle arrangement and the limitation on the weight of the differential mechanism 100 assembly are greatly facilitated.

Note that the gap D in fig. 4 (see fig. 1 to 2) refers to a distance between the annular side wall portion 162 of the first ring gear 13 and the annular side wall portion 162 of the second ring gear 23. For example, referring to the embodiment of fig. 1, 2, and 4, the first and second ring gears 13 and 23 each include a main body flat plate portion 161 and an annular side wall portion 162.

While in other embodiments of the present invention, as in the embodiment with reference to fig. 8 and 9, each of the first and second ring gears 13 and 23 further includes an annular flange portion 163, the annular flange portion 163 extending from an end surface of the annular side wall portion 162 in a direction away from the main plate portion 161, in the embodiment of fig. 8, an inner diameter of the annular flange portion 163 may be substantially equal to an outer diameter of the annular side wall portion 162, so that the annular flange portion 163 corresponds to protruding the annular side wall portion 162 (i.e., the outer peripheral surface of the first or second ring gear 13 or 23) outward in the radial direction. In the embodiment of fig. 9, the outer diameter of the annular flange portion 163 may be substantially equal to the outer diameter of the annular side wall portion 162, and the inner diameter of the annular flange portion 163 may be larger than the inner diameter of the annular side wall portion 162, i.e., the thickness of the annular flange portion 163 is thinner than the thickness of the annular side wall portion 162.

However, in the ring gear structure of the embodiment shown in fig. 1, 2 and 4, the gap D between the two ring gears refers to the gap between the annular side wall portions 162 of the two ring gears. In the ring gear structure in the embodiment of fig. 8 and 9, the gap D between the two ring gears refers to the gap between the annular flange portions 163 of the two ring gears.

For this clearance D, it is mentioned above that the meshing width of the two planetary gears may determine the size of the clearance D to some extent, and at the same time, the thickness of the extension arm 63 also determines the size of the clearance D to some extent. Specifically, when the meshing width of the two planetary gears is equal to the thickness of the extension arm portion 63, the size of the gap D may be substantially equal to the meshing width of the two planetary gears or the thickness of the extension arm portion 63. When the thickness of the extension arm portion 63 is larger than the meshing width of the two planetary gears, the size of the gap D may be substantially equal to the thickness of the extension arm portion 63. When the thickness of the extension arm portion 63 is smaller than the meshing width of the two planetary gears, the size of the gap D may be substantially equal to the meshing width of the two planetary gears.

The intermediate connection structure 6 will be described in detail below with reference to specific examples.

As shown in fig. 1 and 2, the intermediate connection structure 6 functions to connect the first and

second carriers

11 and 21 to the input portion 3 so that the first and

second carriers

11 and 21 and the input portion 3 can be coaxially linked. The intermediate connection structure 6 may be fixedly connected to the first carrier 11 and the second carrier 21, respectively, and the input unit 3 may be fixed to an outer surface of the intermediate connection structure 6, so that the first carrier 11 and the second carrier 21 can be coaxially interlocked with the input unit 3.

The present invention provides a possible embodiment for the specific configuration of the intermediate connection structure 6, which of course does not represent or imply that the intermediate connection structure 6 of the present invention can only adopt the configuration of this embodiment. That is, the intermediate connecting structure 6 to be described in the following embodiments is only a possible embodiment and does not limit the scope of the present invention.

Specifically, referring to fig. 1 and 2, the input portion 3 in this embodiment is an annular input gear 3, the intermediate connecting structure 6 includes a first connecting bracket 61 and a second connecting bracket 62, the first connecting bracket 61 is used for connecting the first planet carrier 11 with the input portion 3 (i.e., the input gear 3), the second connecting bracket 62 is used for connecting the second planet carrier 21 with the input portion 3 (i.e., the input gear 3), wherein the first connecting bracket 61 and the second connecting bracket 62 may have the same structure and each may include: a central body portion 64 and an extension arm portion 63 (see fig. 5), wherein the central body portion of the first connecting bracket 61 and the central body portion of the second connecting bracket 62 may be integrally formed to form a common central body portion 64, but not limited thereto.

As shown in fig. 5, the plurality of extension arm portions 63 are provided on the outer peripheral surface of the central body portion 64, and the plurality of extension arm portions 63 and the central body portion 64 may be an integral structure, but are not limited thereto. The plurality of extension arm portions 63 are distributed substantially radially about the central body portion 64, and in the example of fig. 5, the extension arm portions 63 are distributed at equal intervals in three numbers. The extension arm portion 63 is for connection with the input portion 3, and specifically, an outer end of the extension arm portion 63 may extend to and be fixed to an inner peripheral surface of the input portion 3, such as an annular final drive driven gear.

Each set of the corresponding engaged first planetary gear 12 and second planetary gear 22 is located between two adjacent extension arm portions 63, as in the example of fig. 5, there are three extension arm portions 63, and the three extension arm portions 63 define three accommodating cavities (each two adjacent extension arm portions 63 define an accommodating cavity with the inner peripheral surface of the input gear 3), and a pair of engaged first planetary gear 12 and second planetary gear 22 can be disposed in each accommodating cavity, so that the overall structure of the differential 100 is more compact, and the center of gravity of the differential 100 is closer to or located at the center position, which greatly improves the unstable operation, the short service life and the like of the differential 100 caused by the eccentricity or the large eccentricity when the differential 100 operates at high speed.

In a further embodiment, as shown in fig. 3 and 4, the first ring gear 13 may be coaxially connected with a first output shaft 41, and the second ring gear 23 may be coaxially connected with a second output shaft 42. As shown in fig. 2 and 4, while the first carrier 11 is coaxially connected with the first carrier shaft 111, the second carrier 21 is coaxially connected with the second carrier shaft 211, the first output shaft 41 may be a hollow shaft and may be coaxially sleeved on the first carrier shaft 111, and the second output shaft 42 may also be a hollow shaft and may be coaxially sleeved on the second carrier shaft 211. The first planet carrier shaft 111 is fixed coaxially with the central body 64 of the first connecting carrier 61, and the second planet carrier shaft 211 is fixed coaxially with the central body 64 of the second connecting carrier 62, but is not limited thereto.

Further, as an alternative embodiment, the radial dimensions of the first ring gear 13 and the second ring gear 23 are the same, and each of the first ring gear 13 and the second ring gear 23 may be an integrally molded component.

Having described the differential 100 in detail, the remaining structure of the power drive system 1000 will now be described.

Referring to fig. 10-15, the transmission 104 may include a plurality of

input shafts

101, 102 and a power output shaft 103. In some embodiments, the power take-off shaft 103 of the transmission 104 may be one, but is not limited thereto. The power take-off shaft 103 is provided to be interlocked with the input portion 3, for example, a power take-off shaft output gear 110 is provided on the power take-off shaft 103, and the power take-off shaft output gear 110 is in mesh transmission with the input portion 3. In a preferred embodiment, the power take-off shaft output gear 110 forms a final drive with the input 3, wherein the power take-off shaft output gear 110 is configured as a final drive gear and the input 3 is correspondingly configured as a final drive driven gear. Therefore, the structure of the power driving system 1000 is more compact, and the differential 100 is built in the driven gear of the main reducer, so that the differential 100 can better utilize the internal space, and the arrangement of the whole power driving system 1000 is convenient.

Each input shaft is provided in conjunction with the power output shaft 103, in other words, as shown in fig. 10 and 11, the power output shaft 103 follows the motion when any one of the input shafts rotates, or the input shafts follow the motion when the power output shaft 103 rotates.

As shown in fig. 10 and 11, the first motor generator 401 is provided in conjunction with one of the input shafts. As in the example of fig. 10, the first motor generator 401 is linked with the first input shaft 101. In the example of fig. 11, the first motor generator 401 is linked with the second input shaft 102.

For the transmission mode of the

input shafts

101 and 102 and the power output shaft 103, a conventional gear pair can be adopted for transmission.

For example, the power output shaft 103 is fixedly provided with a plurality of fixed driven

gears

107a, 107b, each of which is fixedly provided with a fixed driving gear (e.g., a first fixed driving gear 106 and a second fixed driving gear 105), and the fixed driven gears are engaged with the corresponding fixed driving gears.

As seen in the example of fig. 10-15, the fixed driven gear 107a meshes with the fixed drive gear 105 to form one pair of gear pairs, and the fixed driven gear 107b meshes with the fixed drive gear 106 to form another pair of gear pairs. It will be appreciated that the two pairs of gear pairs have different transmission speed ratios, and therefore the transmission 104 in this embodiment has two transmission gears with different speed ratios, so that the structure of the power drive system 1000 is relatively simple and compact, and the requirement of the vehicle for the transmission speed ratio in normal running can also be met.

As shown in fig. 10-15, the plurality of input shafts includes a first input shaft 101 and a second input shaft 102, the first input shaft 101 may be a solid shaft, the second input shaft 102 may be a hollow shaft, the second input shaft 102 is sleeved on the first input shaft 101, for example, the second input shaft 102 is coaxially sleeved on the first input shaft 101, the axial length of the first input shaft 101 is greater than that of the second input shaft 102, and one end, for example, the right end, of the first input shaft 101 may extend out from the inside of the second input shaft 102.

Each input shaft may be fixedly provided with only one fixed driving gear, that is, the fixed driving gear includes a first fixed driving gear 106 and a second fixed driving gear 105, the first fixed driving gear 106 is fixedly arranged on the first input shaft 101, and the second fixed driving gear 105 is fixedly arranged on the second input shaft 102. Correspondingly, the fixed driven gear includes a first fixed driven gear 107b and a second fixed driven gear 107a, the first fixed driven gear 107b is engaged with the first fixed driving gear 106, and the second fixed driven gear 107a is engaged with the second fixed driving gear 105.

Referring to fig. 10, 12-15, the first motor generator 401 is linked with the first input shaft 101, for example, the first motor generator 401 is linked with the first fixed driving gear 106 through a gear structure, specifically, the first motor generator 401 is driven with the first fixed driving gear 106 through a gear 402 and a gear 403, and the number of teeth of the gears is designed appropriately to obtain the required transmission speed ratio of the first motor generator 401.

In the example of fig. 11, the first motor generator 401 is linked with the second fixed driving gear 105 through a gear structure, and specifically, the first motor generator 401 may transmit power with the second fixed driving gear 105 through a gear 402, a gear 403, a gear 404, and a gear 405, wherein the gear 404 and the gear 405 may be fixed on the same shaft 406, and the transmission speed ratio required by the first motor generator 401 may be obtained by properly designing the number of teeth of the gears.

Further, the power drive system 1000 may further include an engine 301, the engine 301 being configured to be selectively engageable with at least one of the plurality of input shafts, specifically, two input shafts, and a double clutch 204 being provided between the engine 301 and the two input shafts. The dual clutch 204 includes: a first engagement portion 201, a second engagement portion 202 and a third engagement portion 203, wherein the first engagement portion 201 and the second engagement portion 202 may be two driven discs of a dual clutch 204, the third engagement portion 203 may be a housing of the dual clutch 204, at least one of the two driven discs may selectively engage the housing, that is, at least one of the first engagement portion 201 and the second engagement portion 202 may selectively engage the third engagement portion 203. Of course, both driven discs may also be completely disconnected from the housing, i.e. both the first engagement portion 201 and the second engagement portion 202 are in a disconnected state from the third engagement portion 203.

Referring to fig. 10 to 15, the engine 301 is connected to the third engaging portion 203, the first input shaft 101 is connected to the first engaging portion 201, and the second input shaft 102 is connected to the second engaging portion 202. In this way, the power generated by the engine 301 can be selectively output to the first input shaft 101 and the second input shaft 102 through the dual clutch 204.

Referring to fig. 16 to 17 in combination with fig. 1 to 9, the second motor generator 501 is linked with the first ring gear 13, and the third motor generator 503 is linked with the second ring gear 23 according to an embodiment of the present invention. Further, first external teeth 505 are provided on the outer peripheral surface of the first ring gear 13, and the first external teeth 505 may be integrally formed on the outer peripheral surface of the first ring gear 13. The second ring gear 23 is provided on its outer peripheral surface with second outer teeth 506, and the second outer teeth 506 may be integrally formed on the outer peripheral surface of the second ring gear 23. Second motor generator 501 is interlocked with first external teeth 505, and third motor generator 503 is interlocked with second external teeth 506.

Further, a gear 502 may be provided on a motor shaft of the second motor generator 501, the gear 502 being engaged with the first external teeth 505, and a gear 504 may be provided on a motor shaft of the third motor generator 503, the gear 504 being engaged with the second external teeth 506. However, it is to be understood that the manner of linkage of the second motor generator 501 with the first ring gear 13 and the third motor generator 503 with the second ring gear 23 is not limited to that described herein.

Referring to fig. 16 to 17, the second motor generator 501 and the third motor generator 503 are symmetrically distributed about the differential 100, so that the center of gravity of the power drive system 100 is located at the center position or closer to the center position.

Referring to the embodiment of fig. 18-19, one of the main differences between the power drive system 1000 in this embodiment and the power drive system 1000 in the embodiment of fig. 10-17 is that: the number of input shafts. In some embodiments, the input shafts include a first input shaft 101, a second input shaft 102, and a third input shaft 1003, the third input shaft 1003 may be a hollow shaft and is sleeved on the second input shaft 102, the second input shaft 102 may also be a hollow shaft and is sleeved on the first input shaft 101, and the three input shafts may be coaxially arranged. The engine 301 is connected with the first input shaft 101, the second input shaft 102 and the third input shaft 1003 through a three-clutch 205, specifically, the three-clutch 205 has a first driven disk 206, a second driven disk 207, a third driven disk 208 and a housing 209, the housing 209 is selectively engageable with at least one of the first driven disk 206, the second driven disk 207 and the third driven disk 208, the first input shaft 101 is connected with the first driven disk 206, the second input shaft 102 is connected with the second driven disk 207, the third input shaft 1003 is connected with the third driven disk 208, and the engine 301 is connected with the housing 209. In the embodiment of fig. 18, the first driven disk 206, the second driven disk 207 and the third driven disk 208 are axially distributed, and in the embodiment of fig. 19, the first driven disk 206, the second driven disk 207 and the third driven disk 208 are radially distributed.

Exemplary operating conditions of the power drive system 1000 according to an embodiment of the present invention are briefly described below with reference to fig. 10.

For example, the first engaging portion 201 is engaged with the third engaging portion 203, the second engaging portion 202 is disengaged from the third engaging portion 203, and the power generated by the engine 301 is output to the differential 100 through the first input shaft 101 and the power output shaft 103, and the differential 100 distributes the power to the driving wheels on both sides.

For another example, the second engaging portion 202 is engaged with the third engaging portion 203, and the first engaging portion 201 is disengaged from the third engaging portion 203, so that the power generated by the engine 301 is output to the differential 100 through the second input shaft 102 and the power output shaft 103, and the differential 100 distributes the power to the driving wheels on both sides.

For example, the double clutch 204 is completely disengaged, and the power generated by the first motor generator 401 is output to the differential 100 through the first input shaft 101 and the power output shaft 103, and the differential 100 distributes the power to the drive wheels on both sides.

For another example, the first engaging portion 201 is engaged with the third engaging portion 203, and the second engaging portion 202 is disengaged from the third engaging portion 203, so that a part of the power generated by the engine 301 is output to the first motor generator 401 through the first input shaft 101, the first motor generator 401 is driven to generate power as a motor, and another part of the power output by the engine 301 is output to the differential 100 through the power output shaft 103, and the power is distributed to the driving wheels on both sides by the differential 100.

The main difference between the embodiment of fig. 11 and the embodiment of fig. 10 is that the first motor generator 401 is linked with the second input shaft 102, while the embodiment of fig. 10 is that the first motor generator 401 is linked with the first input shaft 101, and the rest of the description is omitted.

For the embodiment of fig. 12-14, the difference is the addition of a rear drive differential lock as compared to the embodiment of fig. 10.

Referring to fig. 12-14 in conjunction with fig. 1-9, the first ring gear 13 is coupled to the left front wheel 910a, e.g., the first ring gear 13 is coaxially coupled to the left front wheel 910a, and the second ring gear 23 is coupled to the right front wheel 910b, e.g., the second ring gear 23 is coaxially coupled to the right front wheel 910 b. The fourth motor generator 901 is linked with the left rear wheel 910c by a gear structure, for example, the fourth motor generator 901 is linked with the left rear wheel 910c by gears W1, W2, W3, W4, the gear W1 is coaxially connected with the fourth motor generator 901, the gear W1 is engaged with the gear W2, the gear W2 is coaxially connected with the gear W3, the gear W3 is engaged with the gear W4, the gear W4 is fixedly provided on the left half shaft 904, and the left rear wheel 910c is provided on the left half shaft 904. Similarly, the fifth motor generator 902 is linked with the right rear wheel 910d through a gear structure, for example, the fifth motor generator 902 is linked with the right rear wheel 910d through gears X1, X2, X3 and X4, the gear X1 is coaxially connected with the fifth motor generator 902, the gear X1 is engaged with the gear X2, the gear X2 is coaxially connected with the gear X3, the gear X3 is engaged with the gear X4, the gear X4 is fixedly disposed on the right half shaft 905, and the right rear wheel 910d is disposed on the right half shaft 905.

In the example of fig. 12, an anti-skid synchronizer 903 is provided for synchronizing the gear W4 with the gear X4, e.g., the anti-skid synchronizer 903 is provided on the gear W4 and is for engaging the gear X4. In the example of fig. 13, an anti-skid synchronizer 903 is provided for synchronizing the gear W1 with the gear X1, e.g., the anti-skid synchronizer 903 is provided on the gear W1 and is for engaging the gear X1. In the example of fig. 14, an anti-slip synchronizer 903 is provided for synchronizing the gear W2 with the gear X2, e.g., the anti-slip synchronizer 903 is provided on the gear W2 and for engaging the gear X2.

In the example of fig. 15, an anti-skid synchronizer 903 is provided for synchronizing a left half shaft 904 and a right half shaft 905, and the fourth motor generator 901 and the fifth motor generator 902 are each a wheel-side motor in this embodiment, as the anti-skid synchronizer 903 is provided on the left half shaft 904 and for engaging the right half shaft 905.

In summary, the anti-skid synchronizer 903 is configured to selectively synchronize the left rear wheel 910c and the right rear wheel 910d, in other words, when the anti-skid synchronizer 903 is in the engaged state, the left rear wheel 910c and the right rear wheel 910d will rotate synchronously, i.e. at the same speed and in the same direction, and at this time, the left rear wheel 910c and the right rear wheel 910d will not rotate at different speeds. When the anti-skid synchronizer 903 is in a disconnected state, the fourth motor generator 901 can drive the left rear wheel 910c alone, the fifth motor generator 902 can drive the right rear wheel 910d alone, and the two rear wheels are independent and do not interfere with each other, so that the function of differential rotation of the wheels is realized.

In addition, for the technical solutions and/or technical features described in the above embodiments, those skilled in the art can combine the technical solutions and/or technical features in the above embodiments without conflict or contradiction, and the combined technical solution may be a superposition of two or more technical solutions, a superposition of two or more technical features, or a superposition of two or more technical solutions and technical features, so that functional interaction and support of each technical solution and/or technical feature with each other can be achieved, and the combined solution has a more superior technical effect.

For example, a person skilled in the art may combine the solution of the first planet gear 12 partially overlapping the second planet gear 22 with the solution of the first planet carrier 11 and the second planet carrier 21 having the plate-like structure, which may effectively reduce the axial size of the differential 100, thereby making the differential 100 smaller in size.

For another example, a person skilled in the art may combine the scheme that the first planet wheel 12 and the second planet wheel 22 partially overlap with the scheme that the planet wheel and the planet carrier are accommodated in the installation space, so that not only the axial size of the differential 100 may be effectively reduced, but also the planet wheel and the planet carrier are hidden in the installation space and prevented from being exposed and damaged, thereby increasing the service life and reducing the maintenance cost.

For another example, a person skilled in the art may combine a scheme in which the revolution axis of the first planet wheel 12 coincides with the revolution axis of the second planet wheel 22 with a scheme in which the revolution radius of the first planet wheel 12 is the same as the revolution radius of the second planet wheel 22, so that the differential 100 has a more compact structure, a smaller occupied volume, and a more convenient arrangement.

For another example, a person skilled in the art may combine a scheme in which the input portion 3 is configured as an annular input gear and is sleeved on the outer peripheral surfaces of the first gear ring 13 and the second gear ring 23 with a scheme in which the input gear 3 is a main reducer driven gear, so that the differential 100 can better utilize the hollow space inside the main reducer driven gear, thereby achieving better space utilization, greatly facilitating the entire vehicle layout of the differential assembly and the restriction on the weight size, and by directly setting the input portion 3 as the annular main reducer driven gear, the main reducer driven gear is not required to be set separately, thereby not only reducing the parts of the entire power drive system and reducing the cost, but also making the structure of the differential 100 more compact and small.

For another example, a person skilled in the art may configure the input portion 3 as a combination of a ring-shaped input gear and a scheme that the input gear 3 surrounds and covers the gap, so that on one hand, the structure of the differential 100 is relatively compact, and the gap is covered by the input gear 3, and the installation space defined by the shells of the two planetary gear trains is relatively more closed, so as to sufficiently protect the components inside the installation space and prolong the service life of the components.

It should be understood, of course, that the above descriptions of examples are only illustrative, and those skilled in the art can freely combine technical solutions and/or combinations of technical features without conflict, and the combined solutions have more advantageous technical effects.

In addition, it is understood that the combined technical solutions also fall into the protection scope of the present invention.

Overall, the differential 100 according to the embodiment of the present invention can effectively save space and reduce weight, and particularly, such a planetary gear type differential 100 can reduce the weight by about 30% and the axial dimension by about 70% as compared with the conventional bevel gear type differential, not only can reduce the friction of the bearings, but also can realize the torque distribution of the left wheel and the right wheel, so that the load distribution of the differential mechanism 100 is more reasonable, the rigidity of the differential mechanism 100 is better, in addition, the transmission efficiency is also improved to a certain extent due to the adoption of the cylindrical gear, for example, the efficiency of the conventional bevel gear transmission with 6-grade precision and 7-grade precision is about 0.97-0.98, and the transmission efficiency of the cylindrical gears with 6-level precision and 7-level precision is about 0.98-0.99, and in addition, the cylindrical gears are adopted, so that the working noise of the differential mechanism 100 is reduced, the heat productivity is reduced, and the service life of the differential mechanism 100 is greatly prolonged. In short, the differential 100 according to the embodiment of the present invention has many advantages of light weight, small size, low cost, high transmission efficiency, low noise, low heat generation, long service life, and the like.

Meanwhile, since the differential 100 according to an embodiment of the present invention may omit a sun gear, the omission of the sun gear may have the following advantages:

from mechanical analysis, the differential is realized by eliminating the sun gear and utilizing the gear ring, because the number of teeth of the gear ring is more than that of the sun gear, and the pitch circle is larger (the pitch circle refers to a pair of circles tangent at the node when the gears are in meshing transmission), so that the load and bearing torque can be more evenly distributed, which is beneficial to prolonging the service life of the differential 100. Meanwhile, the differential mechanism 100 can be better lubricated and cooled due to the fact that the sun wheel is not arranged, namely, a cavity can be formed inside the planetary wheel due to the fact that the sun wheel is omitted, the gear ring and the planetary wheel are meshed in an inner meshing relation (the sun wheel and the planetary wheel are meshed outside), lubricating oil can be stored in the gear ring, and therefore cooling and lubricating effects can be greatly improved. In addition, since the sun gear is eliminated, the number of parts is reduced, the mass and cost of the differential 100 are reduced, and the differential 100 becomes more compact and lighter.

While the power driving system 1000 having the differential 100 according to the embodiment of the present invention has significant advantages in space and driving manner, taking the advantage of space as an example, the power driving system 1000 is particularly suitable for a new energy vehicle, since a power assembly of the new energy vehicle is generally disposed in an engine compartment, the power assembly not only has a transmission, an engine, but also has at least one electric machine, and since the engine compartment has limited space, the compact differential 100 according to the embodiment of the present invention can obtain advantages in space, and is more convenient to dispose. Also for example, taking the advantage of driving manner as an example, the axial space is better arranged due to the greatly reduced axial dimension of the differential 100 according to the embodiment of the present invention, and the differential 100 having two ring gears as power take-off can better achieve power connection with two electric machines (such as the above-described connection of the electric machines through the external teeth of the ring gears), which is difficult to achieve on the conventional conical differential.

Briefly describing a vehicle 10000 according to an embodiment of the present invention, as shown in fig. 20, the vehicle 10000 includes a power driving system 1000 in the above embodiment, and the power driving system 1000 may be used for forward driving or, of course, for backward driving, and the present invention is not limited thereto. It should be understood that other configurations of the vehicle 10000 according to the embodiment of the present invention, such as a brake system, a driving system, a steering system, etc., are known in the art and well known to those skilled in the art, and thus will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A power drive system, comprising:

the differential mechanism comprises a first planet carrier, a first planet wheel, a first gear ring, a second planet carrier, a second planet wheel, a second gear ring and an input part, wherein the first planet wheel is connected with the first planet carrier, the first planet wheel is meshed with the first gear ring, the second planet wheel is connected with the second planet carrier, the second planet wheel is meshed with the second gear ring, the second planet wheel is further meshed with the first planet wheel, the first gear ring and the second gear ring form two power output ends of the differential mechanism, the input part, the first planet carrier and the second planet carrier are coaxially arranged, and the input part is respectively linked with the first planet carrier and the second planet carrier;

a power output shaft configured to be linked with the input portion;

a plurality of input shafts, each of the input shafts being provided in linkage with the power output shaft;

a first motor generator that is linked with one of the plurality of input shafts;

each of the first ring gear and the second ring gear includes: a ring-shaped side wall portion provided on an inner wall surface thereof with a plurality of teeth for meshing with the planetary gears, and ring-shaped flange portions provided on end surfaces of the ring-shaped side wall portions of the two ring gears, respectively, and extending opposite to each other, the ring-shaped flange portions having an inner diameter larger than that of the ring-shaped side wall portion.

2. The power drive system of claim 1, wherein the first planet gear comprises: a first tooth and a second tooth, the second planet comprising: the first tooth part is meshed with the first gear ring, the second tooth part and the third tooth part are correspondingly overlapped in the axial direction and are meshed and matched, and the fourth tooth part is meshed with the second gear ring.

3. The power-drive system of claim 1, wherein the first and second planets are cylindrical gears.

4. The power drive system according to claim 1, characterized in that the first ring gear and the second ring gear are symmetrically disposed, and each of the first ring gear and the second ring gear includes:

5. The power drive system according to claim 1 wherein said input portion is configured as an input gear configured as an annulus and disposed about said first and second ring gear outer surfaces.

6. The power drive system according to claim 5, wherein a gap is provided between the first ring gear and the second ring gear, and the input gear surrounds and covers the gap.

7. The power drive system of claim 1, further comprising: an intermediate connection structure for connecting the first and second carriers to the input portion, the intermediate connection structure including: a first connecting bracket for connecting the first planet carrier with the input portion, and a second connecting bracket for connecting the second planet carrier with the input portion, wherein each of the first and second connecting brackets includes:

8. A drivetrain according to claim 1, wherein each first planet has a first planet axle, both ends of which are connected to the first and second carriers respectively, and each second planet has a second planet axle, both ends of which are connected to the first and second carriers respectively.

9. The power-drive system of claim 1, wherein a revolution radius of the first planet is the same as a revolution radius of the second planet;

the first and second planet carriers being spaced apart, the first and second planet gears being arranged in direct mesh between the first and second planet carriers such that the first and second planet carriers are located on opposite outer sides of the first and second planet gears, respectively;

the annular flange portion has an outer diameter substantially equal to an outer diameter of the annular side wall portion, or an inner diameter substantially equal to an outer diameter of the annular side wall portion such that the annular flange portion projects radially outward from the annular side wall portion.

10. The power drive system of claim 1, further comprising: an engine configured to selectively engage at least one of the plurality of input shafts.

11. A power drive system according to claim 1, wherein a power take-off shaft output gear is provided on the power take-off shaft, the power take-off shaft output gear being in meshing transmission with the input.

12. A power drive system according to claim 11, wherein the pto shaft output gear and the input constitute a final drive, wherein the pto shaft output gear is configured as a final drive gear and the input is configured as a final drive driven gear.

13. A power drive system according to claim 1, wherein the input shaft and the power output shaft are driven by a range gear pair.

14. A power drive system according to claim 13, wherein a plurality of fixed driven gears are fixedly disposed on the power output shaft, a fixed drive gear is fixedly disposed on each of the input shafts, and the fixed driven gears are engaged with the corresponding fixed drive gears.

15. The power drive system of claim 14, wherein the plurality of input shafts comprises:

16. The power drive system of claim 15, further comprising:

an engine; and

17. A power drive system according to claim 15 wherein the first motor generator is geared with the first or second fixed drive gear by a gear arrangement.

18. The power drive system of claim 1, further comprising:

a second motor generator that is linked with the first ring gear, and a third motor generator that is linked with the second ring gear.

19. The power drive system according to claim 18, wherein first external teeth are provided on an outer peripheral surface of the first ring gear, second external teeth are provided on an outer peripheral surface of the second ring gear, the second motor generator is linked with the first external teeth, and the third motor generator is linked with the second external teeth.

20. A power drive system according to claim 1, characterized in that the power drive system comprises a transmission and an engine, the transmission comprises a first input shaft, a second input shaft and a third input shaft, the third input shaft is sleeved on the second input shaft, the second input shaft is sleeved on the first input shaft, and the engine is connected with the first input shaft, the second input shaft and the third input shaft through three clutches.

21. The power-driven system according to claim 1, wherein the first ring gear is linked with a left front wheel, and the second ring gear is linked with a right front wheel;

the power drive system further includes:

22. A vehicle characterized by comprising a power drive system according to any one of claims 1-21.