A three-in-one oil-cooled electric drive structure

Abstract

The invention discloses a three-in-one oil-cooled electric drive structure. The cooling oil in the reducer casing is transported to the main oil circuit of the motor casing. The main oil circuit is divided into a first oil circuit and a second oil circuit at the rear end cover. The first oil circuit is connected to the stator cooling structure, and the second oil circuit is connected to the stator cooling structure. The oil circuit communicates with the rotor cooling structure; the stator cooling structure is used to introduce cooling oil into the upper part of the electric drive, and the stator is directionally cooled through the oil spray holes in the stator oil passage on the motor housing; the rotor cooling structure is used to pass the rotor The cooling oil is rotated and the oil is thrown to achieve cooling. The circulating oil circuit is connected by the structural design of the casing itself, and the oil circuit is divided on the casing to ensure the cooling of the stator and rotor, without the need for additional oil separation structure and copper pipes, which improves the integration of oil-cooled electric drive. , reduce the cost and reduce the risk of oil leakage from the oil pipe.

Description

technical field [0001] The invention belongs to the technical field of oil cooling, and relates to a three-in-one oil-cooled electric drive structure. Background technique [0002] With the popularization of new energy vehicles, the market demand for electric vehicle power system performance continues to increase, and the volume and power density required for electric drive systems are also getting higher and higher. That is to say, the power system structure needs to be as compact and light as possible, so the market is currently in the "three-in-one" product structure integrating the three units of main thrust motor + reducer + controller. However, the traditional water cooling solution cannot directly cool the heat source, and there is thermal resistance. So there is a temperature gradient from the motor windings to the water-cooled case. The windings cannot be cooled directly, resulting in temperature build-up and localized hot spots. Therefore, it is necessary to dir...

AI Technical Summary

Problems solved by technology

Among them, oil spraying requires specially designed injection molded parts for oil separation, which increases material costs and may cause the risk of abnormal sound

The oil injection structure needs to design a special copper tube with holes for spraying. The production process and assembly process are very complicated, and the small holes of the copper tube may be blocked, which will prevent the motor stator from being effectively cooled.

The existing oil-cooled electric drive structure is generally not compact enough in the design of the oil-cooled cooling circuit, and many oil pipes need to be connected externally, such as oil pumps, oil coolers and other components, which not only increase the cost but also have a great risk of oil leakage

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