Power transmission system
AssigneeAisin Ai Co., Ltd.
InventorsYosuke HAYASHI, Takeshige MIYAZAKI, Daisuke SAITO, Atsushi SUZUKI
Life of this patent
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Abstract
A power transmission system includes a control device that controls a motor generator, a synchronizing mechanism, and a clutch mechanism such that at least one of the synchronizing mechanism and the clutch mechanism constantly transmits power between a first shaft and a second shaft during a gear switch from a first-speed gear to a second-speed gear and the motor generator constantly generates torque for a period from operation start of each of the synchronizing mechanism and the clutch mechanism to a power transmission state of the synchronizing mechanism.
Claims4
A power transmission system, comprising:
- a transmission that is located between a motor generator and a wheel both of which are mounted on a vehicle;
- and
- a control device, wherein
- the transmission includes:
- a first shaft that is rotatable;
- a second shaft that is rotatable and parallel to the first shaft;
- a first-speed gear having a first gear and a second gear, the first gear rotatably attached to the first shaft, the second gear attached to the second shaft to mesh with the first gear and integrally rotate with the second shaft;
- a second-speed gear being smaller in gear ratio than the first-speed gear and having a third gear and a fourth gear, the third gear rotatably attached to the first shaft, the fourth gear attached to the second shaft, to mesh with the third gear and integrally rotate with the second shaft;
- a synchronizing mechanism that is interposed between the first shaft and the third gear and to be switched between a power transmission state and a power shut-off state, the power transmission state being a state in which the synchronizing mechanism generates friction force that causes a rotation speed of the first shaft and a rotation speed of the third gear to approach each other, the power shut-off state being a state in which the synchronizing mechanism generates no friction force;
- and
- a clutch mechanism that switches transmission and non-transmission of rotation between the first shaft and the first gear and between the first shaft and the third gear,
- one of the first shaft and the second shaft is connected to the motor generator and the other is connected to the wheel, and
- the control device controls the motor generator, the synchronizing mechanism, and the clutch mechanism such that at least one of the synchronizing mechanism and the clutch mechanism constantly transmits power between the first shaft and the second shaft during a gear switch from the first-speed gear to the second-speed gear, and that the motor generator constantly generates torque for a period from when each of the synchronizing mechanism and the clutch mechanism starts operating to when the synchronizing mechanism is placed in the power transmission state.
Dependencies are inferred from the claim text.