Integrated double-motor distributed drive electric drive axle

Abstract

The invention provides an integrated double-motor distributed drive electric drive axle. The drive axle comprises an integrated power assembly, an axle housing and a hub reduction system, the integrated power assemblies are respectively arranged at the front end and the rear end of the axle housing; the integrated power assembly comprises a driving motor, a speed reducer and a differential mechanism; the driving motor drives the speed reducer and the differential; the hub reducers are respectively arranged at the left and right ends of the axle housing; the hub reduction gear arranged at the left end of the axle housing is in transmission connection with the differential mechanism of the integrated power assembly arranged at the rear end of the axle housing through a first half shaft; thehub reduction gear arranged at the right end of the axle housing is in transmission connection with the differential mechanism of the integrated power assembly arranged at the front end of the axle housing through the second half shaft, and therefore the integrated power assembly has the advantages that the weight of the assembly is reduced, the overall efficiency of the axle is improved, and meanwhile the space utilization rate of the whole vehicle is increased.

Description

technical field [0001] The invention belongs to the technical field of commercial vehicle electric drive axles, in particular to an integrated dual-motor distributed drive electric drive axle. Background technique [0002] In recent years, with the continuous development of the new energy vehicle industry, major car companies and end users have paid more and more attention to the power system of new energy vehicles, especially the structural form of the power system and the spatial layout of the vehicle. At present, domestic and foreign products mostly adopt the direct drive form of the drive motor and the traditional axle. The power is generated by the drive motor, and the power is transmitted to the traditional drive axle through the reduction box or gearbox through the transmission shaft to realize the drive of the whole vehicle. On the other hand, the axle adopts simple integration with the motor, mostly connecting the drive motor with the axle through bolts. For the fi...

AI Technical Summary

Problems solved by technology

[0004] But there are deficiencies in the above-mentioned technical scheme, in the scheme 1., the structure is complicated, the parts and components are numerous, and the weight is heavy.

The axle adopts helical gears, and the efficiency is lower than that of cylindrical gears. The universal joint of the transmission shaft increases the energy loss in the process of power transmission, the power density is low, and the energy consumption is large.

In scheme ②, since the motor is arranged on the side of the main reducer, the center of gravity of the axle deviates too much from the axis of the bearing axle housing, and the cantilever at the end of the drive train where the motor is located is too long, resulting in unbalanced axle counterweight and large vibration during operation. The attitude of the axle is greatly affected, which reduces the comfort and overall reliability, and when the motor is running on bumpy road conditions, the weight of the motor is too large to ensure that it is coaxial with the transmission gear and bearing, which aggravates internal wear and abnormal noise

In the scheme ③, the front and rear arrangement is adopted, and the motor connection parts need to be added. The internal gear train of the main reducer accounts for a large proportion, resulting in a relatively large product weight. At the same time, because the spiral bevel gear is used to change the power transmission direction, its transmission efficiency is lower than that of the cylindrical helical gear. 4%-

[0005] 5%, resulting in a relatively low overall transmission efficiency of this structural product

In scheme ④, the axle housing body is a four-stage assembly structure, with high manufacturing cost and poor precision. There are many joint surfaces connected by bolts, and the failure rate of oil leakage is high. The aluminum motor housing acts as a part of the axle housing. When the axle housing When bearing vertical loads or other radial loads, the motor casing will have additional deformation due to the force, which will affect the transmission accuracy and low reliability

Since two sets of cylindrical planetary gear sets in series are used for deceleration, this deceleration structure is generally used in the wheel reducer of low-speed engineering drive axles. Because of the large number of gears meshing at the same time, the transmission efficiency is relatively low and the noise is large. ;Limited by its own structure, it is extremely difficult to add an AMT transmission on this basis

To sum up, the current electric axle solution has the problems of generally low assembly efficiency and low space utilization.

Images