Secondary speed-reduction rear driving axle assembly

Abstract

The invention discloses a secondary speed-reduction rear driving axle assembly. The secondary speed-reduction rear driving axle assembly comprises a rear axle housing assembly which is horizontally arranged, a main speed reduction belt differential mechanism assembly arranged in the middle of the rear axle housing assembly, wheel hub assemblies arranged at the two ends of the rear axle housing assembly, two disc type brake assemblies and two half axles; the top and bottom of the rear axle housing assembly of the main speed reduction belt differential mechanism assembly are horizontal; the top and bottom of a main speed reducer housing are horizontal; each wheel hub assembly comprises a wheel hub and a wheel side speed reducer which are rotationally arranged at the two ends of the rear axle housing assembly; each wheel side speed reducer comprises a wheel side speed reducer housing, a gear ring, a solar wheel, a planet carrier, more than one planet wheel and an end cover arranged at the end part of the wheel hub assembly; and each planet wheel is engaged with the corresponding solar wheel and the corresponding gear ring at the same time, and each wheel hub and the corresponding wheel side speed reducer housing are in an integrated structure. The secondary speed-reduction rear driving axle assembly has the beneficial effects of compact structure, light weight and wide main speed reduction ratio covering range, and the height of a base plate can be effectively lowered.

Description

technical field [0001] The invention discloses a two-stage deceleration rear drive axle assembly. Background technique [0002] With the continuous advancement of the country's urbanization, a large number of people gather around the city, which puts forward higher requirements for urban public transportation. The state's continuous implementation of environmental protection policies, in order to reduce vehicle exhaust emissions, the state vigorously encourages the development of new energy buses, especially pure electric buses, and raises the research and development of new energy buses to a national strategic level; various vehicle manufacturing companies and parts manufacturers The company has invested a lot of research and development resources in the research and development of new energy vehicles; the demand for new energy buses, especially pure electric vehicles, in the passenger transport market will last for a long time. [0003] However, at the present stage, the ...

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Problems solved by technology

[0003] However, at the present stage, the drive axle assemblies used in the chassis of new energy buses still use the original traditional products, because the traditional drive axle assemblies adopt a one-stage deceleration structure, and the outer dimensions of the axle are large, the weight is large, and it takes up more space on the chassis, which directly affects The battery capacity of the vehicle and the height of the interior floor

[0004] At the same time, since the power of the powertrain of a new energy bus, especially a pure electric bus, is smaller than that of a traditional engine, in order to meet the output torque requirements of the vehicle, the reduction ratio of the drive axle assembly is required to be larger, but the first-stage reduction drive axle The maximum speed ratio of the assembly can only be about 7.5; in order to meet the power requirements of the whole vehicle, only increase the power of the motor or add an additional gearbox; if the power of the motor is increased, the battery capacity will increase Increased power consumption shortens the mileage, and the increase in the outer dimensions of the motor further affects the space layout of the chassis; if the gearbox is added, the control system will be complicated and the manufacturing cost will be increased, and a part of the chassis space will be sacrificed

At the same time, the outer dimension of the first-stage deceleration rear axle is relatively large, and the height of the vehicle floor is arranged relatively high, which has a negative impact on the utilization rate of the car interior space; the rear door is basically a two-stage step

It also causes a lot of inconvenience to passengers on and off the bus

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