Differential speed and variable speed integrated power assembly special for pure electric drive loading vehicle

Abstract

The invention relates to the technical field of power assemblies of engineering machinery vehicle driving systems, in particular to a special differential and variable speed integrated power assembly for a pure electric driving loading vehicle, which comprises wheel driving motors of a front axle and a rear axle, a differential and variable speed integrated gearbox, an electric gear engaging device, an oil pump motor, an oil pump gearbox and an oil pump, the differential and variable speed integrated gearbox is provided with a high gear and a low gear, gear shifting operation of the electric gear shifting device can meet synchronous gear shifting operation of the front axle differential and variable speed integrated gearbox and the rear axle differential and variable speed integrated gearbox, the problem that a manual gear shifting device cannot be used for the front axle gearbox of the loading vehicle is solved, and the oil pump motor is driven through speed reduction, so that efficiency is higher; according to the differential and variable speed integrated power assembly, the blank of a differential and variable speed integrated power assembly special for a domestic pure electric drive loading vehicle is filled, and a unique low-cost and high-cost-performance drive technical scheme is provided for electronization of the loading vehicle; and contributions are made to promotion of popularization and development of pure electric drive loading vehicles and energy conservation and emission reduction.

Description

Technical field [0001] The present invention relates to the powertrain technology field of the driving system of the construction machinery vehicle, specifically a pure electric drive loading vehicle special difference, variable speed integrated powertrain. Background [0002] Most of the existing load truck drive system in China is powered by diesel engines, driving the operation oil pump and the driving oil pump, the hydraulic power of the operation oil pump is used for bucket lifting, loading and unloading and steering, and the hydraulic power of the driving oil pump is used for hydraulic torque increaser speed change, torque increase, drive the front axle and rear axle differential package, as the wheel driving flat mobility and driving transition power of the loading car. Diesel engine-powered loading trucks emit harmful carbon dioxide and dust particles when running, coupled with the noise of diesel engine operation, causing serious pollution to the environment. In order t...

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Problems solved by technology

Due to the difference in pure electric loading, the difference between the high and low speed reduction ratios of the gearbox integrated with the speed change needs to reach 5 times to meet the functional requirements, so it is difficult to develop and design

Second, the loading vehicle needs four-wheel drive, and high and low gears are installed on the front and rear axles. When changing gears, it needs to be carried out synchronously on the front and rear axles. Less than 100% synchronization, the driving speed of the front and rear axle wheels will be greatly inconsistent, resulting in the vehicle being unable to drive, and even causing confusion in the control of the front and rear drive motors; secondly, because the front and rear axle gearboxes need to be synchronized Shifting operation, currently the manual gear shifting device used in the high and low gear transmissions of electric vehicles cannot be used on the loading vehicle, because the front axle of the loading vehicle needs to rotate when it is working, and there is relative movement between the front axle gearbox and the cab , the shift cable of the front axle gearbox cannot be fixed

The feasible method to solve the problem of synchronization and operation of the loading vehicle shifting operation is to use an electric gear shifting device, but at present, there are very few electric gear shifting devices for electric vehicles on the market, and the success rate of the gear shifting devices that can be found is not as high as to 100%, less feasible and completely unsuitable for use on a loading vehicle

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