Electrically driven vehicle

Abstract

Provided is an electric vehicle that is easy to start to move even when there is load applied, and which does not generate rotational resistance of the electric motor when the vehicle is push-walked. A connection / disconnection mechanism is provided between the electric motor (50) and the speed reducing mechanism (70) to switch transmission of the rotating driving force from a disabled state to an enabled state when the electric motor (50) rotates at a predetermined rotation speed or more. The connection / disconnection mechanism is a centrifugal clutch (40). The swing arm (12) is configured as a cantilever-type, supported only at the left side in the vehicle width direction, so that the centrifugal clutch (40), the electric motor (50), and the speed reducing mechanism (70) are arranged in this order, from the left side in the vehicle width direction.

Description

technical field [0001] The present invention relates to electric vehicles, and more particularly to electric vehicles in which drive wheels are driven by electric motors. Background technique [0002] Conventionally, electric vehicles are known in which drive wheels are driven by electric motors. [0003] Patent Document 1 discloses an electric vehicle in which an electric motor is disposed inside a swing arm that rotatably supports rear wheels, and a reduction gear set that performs one-stage reduction is provided between the electric motor and an axle of the rear wheels. [0004] Also, Patent Document 2 discloses an electric vehicle in which a motor is arranged inside a swing arm that rotatably supports rear wheels, and a reduction gear set and a one-way clutch are provided between the motor and the axle of the rear wheels. [0005] Patent Document 1: Japanese Patent Laid-Open No. 2004-358982 [0006] Patent Document 2: Japanese Patent Laid-Open No. 2003-127966 [0007]...

AI Technical Summary

Problems solved by technology

[0007] However, as the characteristics of the motor, it is known that the rotation control after the start of rotation is easy, but the rotation cannot be started from a state where a load larger than the starting torque of the motor is applied.

Although the above-mentioned problems can be solved by making the output of the electric motor sufficiently large, in small vehicles such as two-wheeled vehicles, especially in the swing arm that rotatably supports the rear wheel and is installed on the frame freely, the electric motor of the electric motor is accommodated. In a two-wheeled vehicle, a motor that is too large cannot be used due to the increase in installation space and weight, and the above-mentioned disadvantages sometimes occur

[0008] In the electric vehicle described in Patent Document 1, since the electric motor and the drive wheels are directly connected through the reduction gear set, when the vehicle is heavy or on a slope, etc., it may be difficult to start due to the above-mentioned characteristics of the electric motor. possibility of

In addition, when the vehicle is propelled without the motor generating rotational driving force, there is also the problem of generating rotational resistance of the motor and making the propulsion heavy.

[0009] In addition, in the electric vehicle described in Patent Document 2, since the one-way clutch is provided, there is no rotational resistance when pushing in the forward direction of the vehicle. When reversing, since the one-way clutch connects the rear wheel to the motor, there is a problem of rotation resistance

In addition, when driving on a slope or the like, there is a problem similar to that of the electric vehicle described in Patent Document 1.

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