CN112519492A

CN112519492A - Two-stage speed reduction electric drive axle with double motors and single-speed parallel shaft output

Info

Publication number: CN112519492A
Application number: CN201910877209.9A
Authority: CN
Inventors: 王歆胤; 李群刚; 张凯铄; 张晨男; 陈海明
Original assignee: Dongfeng Dana Axle Co Ltd
Current assignee: Dongfeng Dana Axle Co Ltd
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2021-03-19

Abstract

The name of the present invention is a two-stage deceleration electric drive drive axle with double-motor single-speed parallel shaft output. It belongs to the technical field of new energy vehicles. It mainly solves the problems that the existing electric drive axle has large motor heating and occupies the space for the layout of the chassis structure. Its main features are: it includes the first and second motors, the reducer, the differential, the first and second half shafts; the reducer includes two pairs of meshing first-stage driving gears and first-stage driven gears, and meshing two second-stage gears. The first and second motor shafts are integrated with two first-stage driving gears respectively; the first and second motors, the second-stage reduction driven wheel and the differential adopt parallel shafts. layout. The invention has the characteristics of coaxial compact design, high transmission efficiency, convenient chassis structure layout, light weight and improved vehicle economy, and is mainly used for a two-stage deceleration electric drive axle output by dual motors and single-speed parallel shafts.

Description

Two-stage speed reduction electric drive axle with double motors and single-speed parallel shaft output

Technical Field

The invention belongs to the technical field of new energy automobiles. In particular to a two-stage speed reduction electric drive axle with double motors and single-speed parallel shaft output.

Background

With the development of science and technology and the requirements of environmental protection and energy conservation, the development of the power chain of the whole vehicle is changed from the original engine, the gearbox and the traditional axle into the currently adopted motor and the transmission axle to provide power, and most manufacturers adopt an external single-motor structure at present. The structure is limited by factors such as motor power, an efficient working area and the like, the cost is too high under the condition of higher bearing, the heat generated by the motor is increased, the service life of the motor is influenced and the like; the size of each part is large, the number of the parts is large, the integration level is too low, the arrangement space of a chassis structure is occupied, the arrangement number of batteries and the transmission efficiency are influenced, and the driving range of the vehicle is short; the power performance and the economical efficiency of the whole vehicle are hardly considered.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a two-stage speed reduction electric drive axle with double motors and single-speed parallel shaft output.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a two-level speed reduction electricity that double motor single-speed parallel shaft exported drives axle, includes first motor, reduction gear, differential mechanism, first semi-axis and second semi-axis, its characterized in that: the speed reducer comprises two pairs of meshed primary driving gears and primary driven gears, two meshed secondary speed reducer driving wheels and a secondary speed reduction driven wheel, and the primary driven gears and the secondary speed reducer driving wheels are coaxially arranged; the device also comprises a second motor; the first motor shaft of the first motor is integrated with one primary driving gear, and the second motor shaft of the second motor is integrated with the other primary driving gear; the first motor, the second-stage reduction driven wheel and the differential are arranged in a parallel shaft mode.

In the technical scheme of the invention, the output ends of the first motor and the second motor are respectively meshed with the splines of the two primary driving gears.

The first motor and the second motor in the technical scheme of the invention are driving motors with the same model.

The secondary speed reduction driven wheel and the differential mechanism are integrated to form the secondary speed reduction driven wheel and the differential mechanism; the secondary speed reduction driven wheel and the differential are respectively connected with the first half shaft and the second half shaft through meshing sleeve splines.

According to the technical scheme, the first motor and the second motor are distributed in a mirror symmetry mode relative to a vertical plane where the first half shaft and the second half shaft are located.

The first motor and the second motor in the technical scheme of the invention are driving motors with the same model; the secondary speed reduction driven wheel and the differential are designed integrally to form a secondary speed reduction driven wheel and a differential; the secondary speed reduction driven wheel and the differential are respectively in splined connection with the first half shaft and the second half shaft through meshing sleeves; the first motor and the second motor are distributed in a mirror symmetry mode relative to a vertical plane where the first half shaft and the second half shaft are located.

The invention adopts double motors as power sources, a motor shaft and a primary speed reduction driving gear are designed into a whole, a primary speed reduction driven wheel and a secondary speed reduction driving gear are designed into a whole, a secondary speed reduction driven wheel and a differential mechanism are designed into a whole, the differential mechanism and a half shaft are connected together through a spline and are transmitted to wheels through the half shaft, and the purpose of transmitting power from the motors to the wheels under the condition of ensuring the same rotating speed of the double motors is achieved. The invention adopts the parallel shaft arrangement, so that the spatial structure arrangement of the speed reducer is more reasonable, and the differential mechanism is arranged on the secondary speed reduction driven gear, so that the spatial arrangement is further compact and ingenious. The invention adopts two-stage speed reduction, reduces transmission chains and ensures that the whole vehicle efficiency is higher. The invention adopts the transverse arrangement of the motor and the speed reducer, thereby saving the space of the chassis, enabling the whole vehicle to arrange more batteries and improving the endurance mileage of the whole vehicle.

Compared with the prior art, the invention has the characteristics of coaxial and compact design of structure, high transmission efficiency, convenient structural arrangement of the chassis, light dead weight and improvement on the economy of the whole vehicle, and greatly reduces the problems of overheating and the like caused in the use process of the high-power motor. The invention is mainly used for the electric drive axle with double motors and single-speed parallel shaft output.

Drawings

Fig. 1 is a schematic structural view of the present invention.

In the figure: 1-a first motor, 2-a first motor shaft and a primary driving gear, 3-a first driven gear and a secondary reducer driving gear, 4-a secondary reduction driven gear and a differential, 5-a second motor, 6-a second motor shaft and a primary driving gear, 7-a second driven gear and a secondary reducer driving gear, 8-a first half shaft, 9-a second half shaft, 10-a first wheel and 11-a second wheel.

Detailed Description

As shown in figure 1, the invention relates to a two-stage speed reduction electric drive axle with double motors and single-speed parallel shaft output, which comprises a first motor 1, a second motor 5, a speed reducer, a differential, a first half shaft 8, a second half shaft 9, a first wheel 10 and a second wheel 11. The reducer comprises two pairs of meshed first-stage driving gears and first-stage driven gears, two meshed second-stage reducer driving wheels and a second-stage reducer driven wheel, and the first-stage driven gears and the second-stage reducer driving wheels are coaxially arranged. The first motor shaft of the first motor 1 and a first-stage driving gear are integrally designed to form the first motor shaft and the first-stage driving gear 2. The second motor shaft of the second motor 5 and another primary driving gear are integrally designed to form the second motor shaft and the primary driving gear 6. The output ends of the first motor 1 and the second motor 5 are respectively meshed with the splines of the two primary driving gears. The first motor 1 and the second motor 5 are drive motors of the same type. The sum of the power of the first motor 1 and the power of the second motor 5 are equal to the power of the existing single motor, so that the size and the mass of the first motor 1 and the second motor 5 can be relatively small, the chassis structure space balance arrangement is facilitated, the arrangement number of batteries is not influenced, and the heating is reduced. The first motor 1, the second motor 5, the second-stage reduction driven wheel and the differential mechanism are arranged by adopting parallel shafts. The secondary speed reduction driven wheel and the differential mechanism are designed integrally to form a secondary speed reduction driven wheel and a differential mechanism 4, and the secondary speed reduction driven wheel and the differential mechanism 4 are connected with the first half shaft 8 and the second half shaft 9 through meshing sleeve splines respectively. The first electric machine 1 and the second electric machine 5 are arranged in mirror symmetry with respect to a vertical plane in which the first half shaft 8 and the second half shaft 9 are located, i.e. the first electric machine 1 and the second electric machine 5 have the same horizontal height, and the first electric machine 1 and the second electric machine 5 have the same distance from the half shafts.

The first motor 1, the second motor 5, the second-stage reduction driven wheel and the differential mechanism 4 are arranged by adopting parallel shafts. The first motor shaft and the first-stage driving gear 2 are integrally designed with the second motor shaft and the first-stage driving gear 6, namely, the first motor shaft and the first-stage driving gear are used as a motor output shaft and are also used as a speed reducer input driving gear. The first driven gear and secondary speed reducer driving wheel 3 and the second driven gear and secondary speed reducer driving wheel 7 are integrally designed, and the secondary speed reduction driven wheel and the differential mechanism 4 are integrally designed. ,

during normal work, first motor shaft and one-level driving gear 2 and second motor shaft and one-level driving gear 6 drive first driven gear and secondary reduction gear action wheel 3, second driven gear and secondary reduction gear action wheel 7, first driven gear and secondary reduction gear action wheel 3 and second driven gear and secondary reduction gear action wheel 7 drive second grade reduction from driving wheel and differential mechanism 4, second grade reduction is from driving wheel and differential mechanism 4 drive first semi-axis 8, second semi-axis 9, both pass through spline fit, first semi-axis 8, second semi-axis 9 drives first wheel 10, second wheel 11, thereby make power pass to the wheel from the motor.

Because the secondary speed reduction driven wheel and the differential 4 are not provided with power coupling devices, the output speeds of the two motors to the driven wheel are the same in the normal running process.

The electric drive axle adopts double motors, two-stage speed reduction and parallel shaft arrangement, and the compact structural arrangement can reduce the use of high-power motors, reduce the cost, shorten a transmission chain, improve the efficiency, reduce the occupied space of an axle, reduce the weight of the whole axle, increase the battery capacity of a carriage and improve the driving range of a vehicle.

Claims

1. A two-stage deceleration electric drive axle output with dual motors and single-speed parallel shafts, comprising a first motor (1), a reducer, a differential, a first half shaft (8) and a second half shaft (9) , characterized in that: the reducer includes two pairs of meshed primary gears and primary driven gears, two meshed secondary reducer driving gears and a secondary reduction driven gear, the primary driven gear and The driving wheel of the secondary reducer is coaxially arranged; it also includes a second motor (5); the first motor shaft of the first motor (1) is integrated with a primary driving gear, and the first motor (5) of the second motor (5) The second motor shaft is integrated with another first-stage driving gear; the first motor (1), the second motor (5), the second-stage reduction driven wheel and the differential are arranged in parallel shafts.

2 . The two-stage deceleration electric drive drive bridge with dual-motor single-speed parallel shaft output according to claim 1, characterized in that: the output ends of the first motor (1) and the second motor (5) They mesh with the splines of the two primary drive gears, respectively.

3. A two-stage deceleration electric drive drive axle with dual-motor single-speed parallel shaft output according to claim 1 or 2, characterized in that: the first motor (1) and the second motor (5) are The same type of drive motor.

4. A two-stage deceleration electric drive drive axle with dual-motor single-speed parallel shaft output according to claim 1 or 2, characterized in that: the two-stage deceleration driven wheel and the differential are integrated and designed to form a two-stage reduction gear. The deceleration driven wheel and the differential (4); the secondary deceleration driven wheel and the differential (4) are respectively connected with the first half shaft (8) and the second half shaft (9) through meshing sleeve splines.

5 . A two-stage deceleration electric drive drive axle with dual-motor single-speed parallel shaft output according to claim 1 or 2, characterized in that: the first motor (1) and the second motor (5) are opposite to each other Mirror symmetrical distribution on the vertical plane where the first semi-axis (8) and the second semi-axis (9) are located.

6. A two-stage deceleration electric drive drive axle with dual-motor single-speed parallel shaft output according to claim 1 or 2, characterized in that: the first motor (1) and the second motor (5) are The same type of drive motor; the two-stage deceleration driven wheel and the differential are integrated and designed to form a two-stage deceleration driven wheel and a differential (4); the second-stage deceleration driven wheel and the differential (4) are The half shaft (8) and the second half shaft (9) are connected by splines of the meshing sleeve; the first motor (1) and the second motor (5) are relative to the first half shaft (8) and the second half shaft (9) The vertical plane where it is located is symmetrically distributed.