Two-gear transmission of electric automobile

Abstract

The invention discloses a two-gear transmission of an electric automobile, and belongs to the field of transmissions. The two-gear transmission comprises a shell. A first driven gear, a magnetic powder clutch, a second driven gear and a magnetic powder brake, all of which are sequentially connected, are arranged in the shell. The shell is internally further provided with a planetary gear structure. The planetary gear structure comprises a planet carrier. Four planet wheels are connected to the two ends of the planet carrier. A sun wheel is connected among the four planet wheels. The two-gear transmission further comprises a gear ring. One side of the gear ring is engaged with the planet wheels, and the other side of the gear ring is engaged with the second driven gear. The planet carrier is engaged with the first driven gear through a gear. An electromagnetic brake and an electromagnetic clutch are adopted in the two-gear transmission to replace traditional hydraulic clutches, the size is small, and the weight is small; in combination with the excellent character of motor speed adjusting of a blade electric vehicle, the work slip frequency section between the electromagnetic brake and the electromagnetic clutch is small; and in combination of the rapid response character of the electromagnetic brake and the clutch, the heating amount of the whole transmission is low, and reliability is high.

Description

technical field [0001] The invention relates to a two-speed transmission for an electric vehicle, which is applied to a transmission system of a pure electric vehicle and belongs to the field of transmissions. Background technique [0002] With the development of the economy, the environmental problems are becoming more and more severe. Due to its zero-emission characteristics, pure electric vehicles have been widely used in recent years. The motor direct drive system has the advantages of stable operation and no power interruption. However, electric vehicles adopt a first-gear speed ratio, and the motor cannot always work in the high-efficiency range, especially under low-speed start-up and high-speed operation conditions. [0003] Therefore, electric vehicles began to adopt two-speed transmissions, so that electric vehicles can work in a high-efficiency range. Most of the existing two-speed transmissions follow the traditional transmission scheme. The first transmission sc...

AI Technical Summary

Problems solved by technology

The invention solves the problems of the traditional transmission and overcomes the shortcomings of the current electromagnetic clutch scheme

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