阅读说明：本技术 一种电驱动桥减速器 (Electric drive axle speed reducer ) 是由 华林 王晟 韩星会 杨灿 于 2019-11-15 设计创作，主要内容包括：本申请提供一种电驱动桥减速器,属于汽车领域。其包括减速器壳体；连接法兰安装在减速器壳体的一端开口上；端盖安装在减速器壳体的另一端开口上；驱动轴的一端通过连接法兰可转动地安装在减速器壳体内；第一内齿圈安装在减速器壳体靠近连接法兰的内壁上；第一减速结构套接在驱动轴上,并与第一内齿圈啮合；行星架设置在减速器壳体内,并与第一内齿圈相邻,第一减速结构的一端与行星架传动连接；第二内齿圈安装在减速器壳体靠近端盖的内壁上；差速器壳体安装在减速器壳体内,并与端盖连接；第二减速结构可转动地安装在差速器壳体的周侧上,第二减速结构的一端与行星架啮合,另一端与第二内齿圈啮合。因此,该结构减速比大、结构紧凑且安装空间小。(The application provides an electric drive axle reduction gear belongs to the automobile field. It includes a reducer housing; the connecting flange is arranged on an opening at one end of the speed reducer shell; the end cover is arranged on an opening at the other end of the speed reducer shell; one end of the driving shaft is rotatably arranged in the reducer shell through a connecting flange; the first inner gear ring is arranged on the inner wall of the speed reducer shell close to the connecting flange; the first speed reducing structure is sleeved on the driving shaft and is meshed with the first inner gear ring; the planet carrier is arranged in the speed reducer shell and is adjacent to the first inner gear ring, and one end of the first speed reducing structure is in transmission connection with the planet carrier; the second inner gear ring is arranged on the inner wall of the speed reducer shell close to the end cover; the differential shell is arranged in the reducer shell and is connected with the end cover; the second speed reducing structure is rotatably installed on the peripheral side of the differential case, one end of the second speed reducing structure is meshed with the planet carrier, and the other end of the second speed reducing structure is meshed with the second inner gear ring. Therefore, the structure has large reduction ratio, compact structure and small installation space.)

1. An electric drive axle retarder, comprising:

a reducer housing;

the connecting flange is arranged on an opening at one end of the speed reducer shell;

the end cover is arranged on an opening at the other end of the speed reducer shell;

a drive shaft, one end of which is rotatably mounted in the reducer housing through the connecting flange;

the first inner gear ring is mounted on the inner wall, close to the connecting flange, of the speed reducer shell;

the first speed reducing structure is sleeved on the driving shaft and is meshed with the first inner gear ring;

the planet carrier is arranged in the speed reducer shell and is adjacent to the first inner gear ring, and one end of the first speed reducing structure is in transmission connection with the planet carrier;

the second inner gear ring is mounted on the inner wall, close to the end cover, of the speed reducer shell;

the differential shell is arranged in the speed reducer shell and is connected with the end cover;

and the second speed reducing structure is rotatably arranged on the peripheral side of the differential shell, one end of the second speed reducing structure is meshed with the planet carrier, and the other end of the second speed reducing structure is meshed with the second inner gear ring.

2. The electric drive axle reducer of claim 1, wherein the first reduction structure comprises:

a sun gear sleeved on the driving shaft;

the two ends of the planet gears are respectively meshed with the sun gear and the first inner gear ring;

the planet wheel is rotatably sleeved on the planet pin shaft.

3. The electric drive axle reducer of claim 2, wherein the sun gear is in driving connection with the drive shaft by splines.

4. The electric drive axle reducer according to claim 1, wherein a motor bearing and a motor sealing ring are sleeved on the drive shaft, and the connecting flange is sleeved outside the motor bearing and the motor sealing ring.

5. The electric drive axle reducer according to claim 1, wherein the second reduction structure includes a plurality of planetary gear shafts rotatably mounted on the peripheral side of the differential case, the planetary gear shafts having one end engaged with the carrier and the other end engaged with the second ring gear.

6. The electric drive axle reducer of claim 5, wherein the planet pins comprise a first pin and a second pin, the first pin being keyed to the second pin, and the first pin and the second pin being rotatably mounted on the peripheral side of the differential case.

7. The electric drive axle reducer of claim 6, wherein the first gear shaft is connected to the differential case by roller bearings, and the second gear shaft is connected to the differential case by needle bearings.

8. The electric drive axle reducer of claim 1, wherein the reducer housing, the drive shaft, the first reduction structure, the planet carrier, the second reduction structure, and the differential housing are coaxially disposed.

9. The electric drive axle reducer of claim 2, wherein the gears of the first ring gear, the second ring gear, the sun gear, and the planet gears all adopt a straight tooth structure.

10. The electric drive axle reducer of claim 2, wherein a connecting bearing is mounted between the planet wheel and the planet pin.

Technical Field

The application relates to the field of automobiles, in particular to an electric drive axle speed reducer.

Background

In recent years, electric vehicles gradually become a new trend of development of the automobile industry, and governments of various countries encourage the automobile industry to shift research on traditional fuel vehicles with high energy consumption and high pollution to electric vehicles with low energy consumption, zero emission or low emission. The replacement of the power transmission assembly of the electric automobile is a core problem of the design of the electric automobile.

At present, commercial electric automobile usually adopts two kinds of power transmission assembly replacement forms, and one is with the motor replacement engine, and other transmission parts remain unchanged, and this kind of structural style has led to commercial car battery to arrange the space little, the big scheduling problem of weight. The other is an electric drive axle structure, the power transmission assembly is arranged on a rear axle or a front axle of the vehicle, the structure form of the electric drive axle structure comprises a rear axle structure directly driven by a motor and a rear axle structure with the motor eccentric, in the structure, a main shaft of the motor is parallel to a half shaft of the rear axle, and the motor is fixed on a floor of the vehicle body or a vehicle frame.

In the two structures, the former causes the problems of heavy weight of a rear axle, low working efficiency of a motor and the like, and the latter greatly changes the chassis part, so that the battery arrangement space is tense, and the design and production cost of the chassis is increased. The invention provides a coaxial type commercial vehicle electric drive axle reducer structure which occupies a small chassis space, basically changes a chassis part, is easy to arrange a battery pack, has a large speed ratio, is matched with a high-speed motor to reduce the total weight of a rear axle, improves the working efficiency of the high-speed motor, and has certain innovativeness and practicability.

Disclosure of Invention

One of the objectives of the present application is to provide an electric drive axle speed reducer, which aims to solve the technical problem of large occupied space of the existing power transmission assembly of an automobile.

The technical scheme of the application is as follows:

an electric drive axle retarder comprising:

a reducer housing;

the connecting flange is arranged on an opening at one end of the speed reducer shell;

the end cover is arranged on an opening at the other end of the speed reducer shell;

a drive shaft, one end of which is rotatably mounted in the reducer housing through the connecting flange;

the first inner gear ring is mounted on the inner wall, close to the connecting flange, of the speed reducer shell;

the first speed reducing structure is sleeved on the driving shaft and is meshed with the first inner gear ring;

the planet carrier is arranged in the speed reducer shell and is adjacent to the first inner gear ring, and one end of the first speed reducing structure is in transmission connection with the planet carrier;

the second inner gear ring is mounted on the inner wall, close to the end cover, of the speed reducer shell;

the differential shell is arranged in the speed reducer shell and is connected with the end cover;

and the second speed reducing structure is rotatably arranged on the peripheral side of the differential shell, one end of the second speed reducing structure is meshed with the planet carrier, and the other end of the second speed reducing structure is meshed with the second inner gear ring.

As one technical solution of the present application, the first decelerating structure includes:

a sun gear sleeved on the driving shaft;

the two ends of the planet gears are respectively meshed with the sun gear and the first inner gear ring;

the planet wheel is rotatably sleeved on the planet pin shaft.

As a technical scheme of the application, the sun gear is in transmission connection with the driving shaft through a spline.

As a technical scheme of this application, motor bearing and motor seal circle have been cup jointed on the drive shaft, flange cup joints motor bearing with outside the motor seal circle.

As a technical scheme of this application, second reduction structure includes a plurality of planet gear shafts, the planet gear shaft is rotationally installed on the week side of differential mechanism casing, the one end of planet gear shaft with the planet carrier meshing, the other end with the meshing of second ring gear.

As a technical solution of the present application, the planetary gear shaft includes a first gear shaft and a second gear shaft, the first gear shaft is connected to the second gear shaft key, and the first gear shaft and the second gear shaft are rotatably installed on the peripheral side of the differential case.

As one technical solution of the present application, the first gear shaft is connected to the differential case by a roller bearing, and the second gear shaft is connected to the differential case by a needle bearing.

As a technical scheme of this application, reduction gear casing the drive shaft first speed reduction structure the planet carrier second speed reduction structure and differential mechanism casing coaxial setting.

As a technical scheme of the application, the first inner gear ring, the second inner gear ring, the sun gear and the gear of the planet gear all adopt straight tooth structures.

As a technical scheme of this application, the planet wheel with install between the planet round pin axle and connect the bearing.

The beneficial effect of this application:

in the electric drive axle reduction gear of this application, through setting up first speed reduction structure and second speed reduction structure for whole reduction gear has that the reduction ratio is big (the reduction ratio can reach 20 ~ 30), compact structure, installation space characteristics such as little, and its supporting high-speed motor is used for car rear drive axle electric drive assembly, has advantages such as light in weight, power density is big, operating efficiency height. All gears in the speed reducer adopt straight tooth structures, so that the problem of axial force can be solved, and the service life of all bearings in the speed reducer is prolonged. Meanwhile, the speed reducer is connected with a high-speed motor through a motor spindle (namely a driving shaft), the rotating speed of the high-speed motor can reach 15000rpm, and a high-speed electric drive system formed by the high-speed motor and the speed reducer has two advantages, one is that the weight of the motor is greatly reduced; and secondly, the common operation interval of the high-speed motor is near the higher efficiency point, so that the operation efficiency of the high-speed motor is improved. In addition, the power transmission condition of the first speed reducing structure and the second speed reducing structure is that power is input from the sun gear and output from the planet carrier, so that the integral speed reducing ratio and speed reducing efficiency can be effectively improved, and the occupied space of the whole structure is saved. The differential shell is used as the planet carrier of the second speed reducing structure, and the differential shell is arranged inside the speed reducer shell by the design, so that the axial arrangement space of the differential shell is greatly optimized. Moreover, the differential shell is fixedly connected with the end cover of the speed reducer, and the strength and the rigidity of the speed reducer shell can be effectively ensured by arranging the reinforcing rib structure. Secondly, reduction gear casing, drive shaft, first speed reduction structure, planet carrier, second speed reduction structure and differential mechanism casing coaxial setting, the space of arranging of reduction gear casing can be optimized in this design, and is less to whole vehicle chassis and rear axle braking system influence under the condition that satisfies minimum ground clearance.

Drawings

In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic structural diagram of an electric drive axle reducer provided in an embodiment of the present application;

fig. 2 is a schematic view of a first deceleration structure provided in the embodiment of the present application;

fig. 3 is a schematic diagram of a second deceleration structure provided in the embodiment of the present application.

Icon: 1-electric drive axle reducer; 2-a reducer housing; 3-a connecting flange; 4-end cover; 5-a drive shaft; 6-a first ring gear; 7-a first reduction structure; 8-a planet carrier; 9-a second ring gear; 10-a differential housing; 11-a second reduction arrangement; 12-a motor bearing; 13-motor sealing ring; 14-a sun gear; 15-a planet wheel; 16-a planet pin; 17-connecting the bearing; 18-a first gear shaft; 19-a second gear shaft; 20-roller bearings; 21-needle bearing.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.

Further, in the present application, unless expressly stated or limited otherwise, the first feature may be directly contacting the second feature or may be directly contacting the second feature, or the first and second features may be contacted with each other through another feature therebetween, not directly contacting the second feature. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.