A mechanical automatic transmission for electric vehicles with overrunning clutch

Abstract

The invention provides a mechanical automatic transmission of an electric automobile provided with an overrun clutch, and belongs to the technical field of transmission of electric automobiles. The transmission comprises a transmission control system, a variable transmission mechanism, a gear shift operating mechanism and a reverse gear operating mechanism, wherein the variable transmission mechanism is provided with the overrun clutch and performs two-stage transmission; and the gear shift operating mechanism comprises a centrifugal gear shift operating mechanism and a synchronizer gear shift mechanism, the centrifugal gear shift operating mechanism adopts a mechanical structure, detects a speed of the automobile through gear transmission and produces centrifugal force, and the centrifugal force is combined with spring return force, so that mechanical automatic speed changing is realized. According to the mechanical automatic transmission, performance requirements for a driving motor are reduced, and the efficiency of the driving motor and the dynamic property and economy of the whole automobile are improved; an electric control gear shift mechanism is omitted and replaced with the mechanical gear shift mechanism, so that the production cost is reduced, and the system stability is improved; and simultaneously, the overrun clutch and the synchronizer gear shift mechanism are utilized, so that the power failure time during the gear shift process is shortened, the transmitted torque of the transmission is increased, and the system reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle transmission and relates to an automatic transmission for electric vehicles, in particular to a mechanical transmission for electric vehicles that realizes automatic shifting through a mechanical structure with the assistance of an overrunning clutch. Background technique [0002] In order to solve the two world-wide problems of energy crisis and environmental pollution, electric vehicle technology has become the main direction of future automobile development. In the power transmission system of a general internal combustion engine vehicle, a multi-speed transmission mode is often used to enable the vehicle to obtain good power and fuel economy, and effectively reduce engine emission pollution. Compared with the internal combustion engine, the motor drive has the mechanical characteristics of constant torque at low speed and constant power at high speed, and has a wide range of speed reg...

AI Technical Summary

Problems solved by technology

The advantage is that the shift strategy can be controlled by a computer, and the shift is precise and controllable; however, the structure of this automatic transmission is relatively complicated, and it is highly dependent on electronic devices, which will lead to an increase in manufacturing costs and a decrease in system stability.

The invention patent with the application number CN201210201260.6 discloses a mechanical intelligent self-adaptive two-speed multi-cam automatic transmission, which can automatically shift gears and speed changes with changes in driving resistance, but the gear change cannot be related to the vehicle speed; the application number is 201120108947.6 The utility model discloses a two-speed automatic transmission of an electric vehicle, which uses an automatic clutch and a one-way clutch to shift gears, but the mechanical automatic clutch has the problem of limited transmission power, and the electronically controlled automatic clutch requires additional electronic control components

At the same time, the existing electric vehicle mechanical automatic transmission also has the disadvantage of long power interruption time

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