Electronic oil pump for pre-tightening CVT transmission steel belt

Abstract

The invention relates to an electronic oil pump for pre-tightening a CVT transmission steel belt. The electronic oil pump comprises a motor, a pump body, a pump cover, an outer rotor, an inner rotor and a positioning shaft, wherein the outer rotor is installed in a rotor cavity of the pump body, the inner rotor internally meshes with the outer rotor, and a shaft hole of the inner rotor is composedof a positioning shaft hole and a transmission shaft hole. An output shaft of the motor is in transmission connection in the transmission shaft hole, a lining is installed in the positioning shaft hole in an interference mode, one end of the positioning shaft is installed in the lining in a clearance mode, and the other end of the positioning shaft is installed in a pump body shaft hole in an interference mode. According to the technical scheme, the internal gap of the oil pump can be reduced, the pressure bearing capacity of the oil pump is improved, the inner rotor radial force needing to be borne by the output shaft of the motor is reduced, so that the electronic oil pump can be used for pre-tightening the CVT transmission steel belt and directly participates in work of a transmissionhydraulic system, transmission response time is shortened, the transmission efficiency of a transmission is improved, and therefore, the power loss of an engine is reduced.

Description

technical field [0001] The invention relates to the technical field of transmission electronic oil pumps, in particular to an electronic oil pump used for pretensioning steel belts of CVT transmissions. Background technique [0002] From the perspective of global energy development trends and international internal combustion engine technology, controlling internal combustion engine fuel consumption and carbon dioxide and other pollutant emissions is becoming the most effective way to deal with environmental protection and energy shortages in the world. At present, "energy-saving vehicles and new energy vehicles" have been included in the key development areas of Chinese manufacturing, and the national energy-saving and emission-reduction policies are gradually requiring passenger vehicles to reduce fuel consumption indicators. [0003] In order to meet the increasingly stringent emission standards, the transmission field has changed from the traditional large-displacement m...

AI Technical Summary

Problems solved by technology

This structure requires high precision of cooperation between the oil pump and the motor, otherwise it is easy to cause the oil pump to get stuck and the rotation is inflexible. If the oil pump wants to obtain higher pressure, the internal clearance needs to be reduced. The matching accuracy puts forward higher requirements, but in fact, there is a certain shape and position tolerance in the matching between the motor and the oil pump, which leads to the low oil supply pressure of the current electronic oil pump.

[0005] On the other hand, because it is a transmission electronic oil pump, the structure of the transmission itself is very compact, so the electronic oil pump needs to strictly control the size, the output shaft of the motor is often small, and the output shaft of the motor is usually supported by bearings to keep the rotor and the shaft Rotation, the smaller bearing radial load capacity is also small, which will further restrict the development of the oil pump in the direction of high pressure, otherwise the bearing will fail due to the large radial load of high pressure

[0006] Based on the above reasons, the current transmission electronic oil pump is usually used as a lubricating oil pump, and it is impossible for the electronic oil pump to participate in the work of the transmission hydraulic system, which hinders the application of the electronic oil pump in transmission hydraulics

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