Patent TW-201302509-A (TW)
Title: Driving structure for electric vehicle
Inventor: Su guo-xin
IPC: B60K17/12
Filed: 2011-07-15
Abstract: The invention relates to a driving structure for an electric vehicle, comprising a hub, a motor, a rotational shaft sleeve, a direct drive active clutch, a speed reduction clutch, a planetary gear set, and a clutch switching unit. The clutch switching unit is mainly utilized to make an external rotor of the external rotor motor to drive the rotational shaft sleeve. The rotational shaft sleeve is utilized to drive the direct drive active clutch to drive the hub to rotate, or the rotational shaft sleeve is utilized to drive the planetary gear set and the speed reduction clutch to drive the hub, making the hub obtain speed reduced rotation. At an initial driving stage of the motor, the direct drive active clutch disposed in the hub is not subject to the press of the spring to appear in an idling state while the output rotation speed of the motor is reduced by the planetary gear set; and afterwards, the hub can be in a speed reduced driving state by pressing the speed reduction clutch located outside the hub on the hub, thereby making the motor obtaining effort-saving and electricity-saving efficacies in a vehicle starting stage. When the rotational speed of the hub (vehicle speed) reaches a predetermined value, a motor is actuated by a control circuit according to the vehicle speed data to make the clutch switching unit separate the speed reduction clutch from the hub, and to make the planetary gear set idling; meanwhile, the direct drive active clutch disposed in the hub is pressed to appear in a driving state, thereby making the hub directly driven by the external rotor of the motor to obtain a higher vehicle speed required. The invention relates to a driving structure for an electric vehicle, comprising a hub, a motor, a rotational shaft sleeve, a direct drive active clutch, a speed reduction clutch, a planetary gear set, and a clutch switching unit. The clutch switching unit is mainly utilized to make an external rotor of the external rotor motor to drive the rotational shaft sleeve. The rotational shaft sleeve is utilized to drive the direct drive active clutch to drive the hub to rotate, or the rotational shaft sleeve is utilized to drive the planetary gear set and the speed reduction clutch to drive the hub, making the hub obtain speed reduced rotation. At an initial driving stage of the motor, the direct drive active clutch disposed in the hub is not subject to the press of the spring to appear in an idling state while the output rotation speed of the motor is reduced by the planetary gear set; and afterwards, the hub can be in a speed reduced driving state by pressing the speed reduction clutch located outside the hub on the hub, thereby making the motor obtaining effort-saving and electricity-saving efficacies in a vehicle starting stage. When the rotational speed of the hub (vehicle speed) reaches a predetermined value, a motor is actuated by a control circuit according to the vehicle speed data to make the clutch switching unit separate the speed reduction clutch from the hub, and to make the planetary gear set idling; meanwhile, the direct drive active clutch disposed in the hub is pressed to appear in a driving state, thereby making the hub directly driven by the external rotor of the motor to obtain a higher vehicle speed required.