Vehicle drive device

Abstract

The rear-wheel drive device (1) includes: an electric motor (2A, 2B) that generates driving force for the vehicle; and a hydraulic brake (60A, 60B) that is provided on a power transmission path between the electric motor (2A, 2B) and the rear wheel (Wr). on the motor side and the wheel side through separation or engagement; the ECU (45), which controls the electric motors (2A, 2B) and the hydraulic brakes (60A, 60B); the one-way clutch (50), It is disposed in parallel with the hydraulic brake (60A, 60B) on the power transmission path between the electric motor (2A, 2B) and the rear wheel (Wr), and is in an engaged state when forward rotational power from the electric motor side is input to the wheel side, and When the reverse rotational power on the motor side is input to the wheel side, it becomes a non-engagement state. When the forward rotational power on the wheel side is input to the motor side, it becomes a non-engagement state, and when the reverse rotational power on the wheel side is input to the motor, it becomes a non-engagement state. It becomes engaged when inputting from the side. When forward rotational power from the motor side is input to the wheel side, the ECU (45) engages the hydraulic brakes (60A, 60B) so that the motor side and the wheel side are connected.

Description

technical field [0001] The present invention relates to a driving device for a vehicle, which includes: an electric motor generating driving force of the vehicle; and a hydraulic disconnect mechanism provided on a power transmission path between the electric motor and wheels to cut off or connect the power. Background technique [0002] The vehicle described in Patent Document 1 such as Figure 25 As shown, the front wheels are driven by a main drive source such as an engine (both not shown), and the rear wheels 102 of the vehicle 100 are driven by an electric motor 103 as an auxiliary drive source via a power transmission mechanism 104 . [0003] The power transmission mechanism 104 includes: a reduction mechanism 105 for inputting power from a motor 103 ; and a differential gear 106 for distributing the power output from the reduction mechanism 105 to the left and right rear wheels 102 , 102 . The reduction mechanism 105 is constituted by a reduction gear train, and the re...

AI Technical Summary

Problems solved by technology

[0009] However, in the power transmission mechanism 104 described in Patent Document 1, in order to transmit the power of the electric motor 103 to the rear wheels 102, it is necessary to firmly engage the hydraulic clutch 107 so as to enable power transmission to maintain a state with a large torque capacity. , so response delays may occur, for example, at low oil temperatures

[0010] In addition, when the electric motor 103 decelerates and regenerates from the state where the electric motor 103 is stopped while the vehicle is running, it is necessary to engage the hydraulic clutch 107 after performing rotation speed control, which may cause a delay in response.

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