Lubricating system for electronic continuously variable transmission of electric vehicle and design method of lubricating system

Abstract

The invention relates to a lubricating system for an electronic continuously variable transmission of an electric vehicle. The lubricating system comprises lubricating oil and an oil pump, the lubricating oil is arranged in a transmission case, a differential is positioned in the lubricating oil, the oil pump is respectively connected with the lubricating oil and a spindle through pipelines, and a plurality of oil holes are radially arranged on the spindle. Preferably, the oil holes include first oil holes and second oil holes, and a planetary structure is positioned among the first oil holes and the second oil holes. The oil pump is arranged outside the transmission case, placed on the transmission case and connected with the lubricating oil through a filter pipeline, an overflow valve is parallelly connected with the pipeline for connecting the oil pump with the spindle, both an oil retaining rib and an oil guide groove are mounted on the inner wall of the transmission case, and the oil retaining rib is communicated with a position needing lubricating through fluids of the oil guide groove. The lubricating system is ingenious in design, simple in structure and suitable for large-scale popularization and use, can be matched with the structure of the electronic continuously variable transmission, and has the advantages that lubricating effects are fine, transmission efficiency is not affected, and the weight of the transmission is not increased.

Description

technical field [0001] The invention relates to the technical field of electric vehicle transmission systems, in particular to the technical field of lubrication systems for electric vehicle transmission systems, and specifically refers to a lubrication system for electronic continuously variable transmissions of electric vehicles and a design method thereof. Background technique [0002] Electric vehicle transmissions generally use oil-immersion lubrication and splash lubrication. Splash lubrication is to store a certain amount of lubricating oil in the transmission housing. When the transmission gear pair rotates at high speed, the lubricating oil will be rolled up and splashed on the gears, shafts, bearings and other related parts that need to be lubricated. Because the structure of the transmission is generally relatively Complex, especially in high-speed operation, splash lubrication often cannot meet the lubrication requirements, which directly leads to low oil lubrica...

AI Technical Summary

Problems solved by technology

Splash lubrication is to store a certain amount of lubricating oil in the transmission housing. When the transmission gear pair rotates at high speed, the lubricating oil will be rolled up and splashed on the gears, shafts, bearings and other related parts that need to be lubricated. Because the structure of the transmission is generally relatively Complex, especially in high-speed operation, splash lubrication often cannot meet the lubrication requirements, which directly leads to low oil lubrication efficiency and seriously affects the transmission efficiency of the transmission

[0003] Most of the existing patented technologies for designing the transmission lubrication system are to install an additional device in the transmission and installed on the casing. Although it can solve the problem of bearing lubrication, it will increase the weight of the transmission to a certain extent, and It will also lead to a reduction in the space in the transmission, poor heat dissipation performance, and affect the overall efficiency of the transmission

[0004] For the lubrication of the planetary structure, there are two existing technologies: one is oil-immersed lubrication. The disadvantage of this type of lubrication is obvious. Because the planetary structure is surrounded by a ring gear, it is difficult for oil to enter the interior to lubricate the planetary gear and the sun. If there is more oil, the transmission efficiency of the planetary structure will be greatly reduced; the other is to drill holes in the outer wall of the shell and the parts of the planetary structure to be lubricated, and use oil delivery pipes to extend into these holes to transport the oil in for lubrication. For lubricating parts, although this kind of lubricating scheme is desirable, its applicability is not strong, because the planetary structure is a high-speed running part, and it is difficult for the hole on the outer wall of the shell to be exactly aligned with the part to be lubricated, so even if the oil is input, it is difficult to reach the part to be lubricated. Lubrication parts, the lubrication effect is not good

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