Electric automobile

Abstract

An electric automobile configured in such a manner that the transmission of power from the electric motor to wheels can be immediately shut off when the electric motor fails or when the ABS is activated. A two-way clutch (21) is mounted in the power transmitting system for transmitting the drive power of the electric motor (10) to the front wheels (2). The two-way clutch (21) is provided with a retainer (28) and rollers (30) retained by the retainer (28), and the two-way clutch (21) couples the drive side shaft and the driven side shaft to each other by means of the engagement of the rollers (30) caused by rotational control of the retainer (28). The transmission of power from the electric motor (10) to the front wheels (2) is immediately interrupted by controlling the engagement and disengagement of the two-way clutch (21) by conducting and interrupting electricity to the electromagnetic coil (43a) of an electromagnetic clutch (40).

Description

technical field [0001] The present invention relates to an electric vehicle that runs the vehicle only by the drive of an electric motor mounted on the vehicle. Background technique [0002] In an electric vehicle that drives the vehicle only by the drive of the electric motor, if the electric motor or the control unit that controls the electric motor fails while the vehicle is running, the driving wheels will lock and brake suddenly, making it impossible to steer. Thus becoming an extremely dangerous state. [0003] In order to eliminate such undesirable situations, a fail-safe function is provided in an electric vehicle. An electric vehicle described in Patent Document 1 is conventionally known as an electric vehicle having a fail-safe function. [0004] In the electric vehicle described in the above-mentioned Patent Document 1, a clutch is assembled in the power transmission system from the electric motor to the wheels, and a determination unit for determining failure o...

AI Technical Summary

Problems solved by technology

[0010] Therefore, there is a disadvantageous situation as follows: when the electric vehicle is started at a low speed, after the accelerator pedal is stepped on hard, when the step is released, the large torsion generated in the driving part when the pedal is stepped on is suddenly released, thereby causing back-and-forth swing vibration, the vibration Spread to the vehicle body to give the driver a sense of uneasiness or make the ride feel worse

[0011] In addition, in an electric vehicle equipped with an anti-lock braking system (ABS), the following disadvantages may occur: the work of applying the braking force to the wheels and releasing the braking force applied to the wheels are repeated in a short period of several milliseconds. Therefore, when the ABS is working, if the wheels and the motor are connected, the wheels will continue to rotate due to the inertia of the rotor with a large inertia force of the motor, so that the tracking of the wheels relative to the ABS control becomes poor, and braking The distance becomes longer, the vehicle spins and the driving becomes unstable

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