US20260034876
2026-02-05
Performing operations; transporting
B60K6/365
The drive apparatus for a vehicle integrates an engine and a drive unit featuring two electric motors and a planetary gear device. This system is designed to optimize the vehicle's drive modes, including both Hybrid Electric Vehicle (HEV) and Battery Electric Vehicle (BEV) modes. The apparatus connects the engine and the first electric motor to the first rotary element of the planetary gear. The second electric motor is aligned on the first axis, connected to the second rotary element, while the drive shaft links to the third rotary element. A brake mechanism is incorporated to halt the first rotary element's rotation when required.
Existing vehicle drive systems often include an engine and a dual electric motor setup with a planetary gear device. The Japanese Patent Application JP 2014-80135 A illustrates such a system, emphasizing a reduced axial dimension by aligning the input and output shafts of the electric motor parallel to the engine's. The new invention aims to further compact the drive unit while enhancing functionality.
The drive apparatus allows for diverse driving modes by strategically connecting the engine and motors to the planetary gear's rotary elements. In HEV mode, the engine operates with power transfer between the motors. In BEV mode, the engine is inactive, and the motors generate the necessary torque. A brake mechanism can stop the first rotary element during BEV mode, using the second motor as the primary power source, thus optimizing performance and size.
The invention achieves a compact design by positioning the second motor on the first axis and the first motor on a second axis, linking it to the first rotary element via a power transmission mechanism. The brake mechanism is strategically placed on a rotary shaft that rotates about a different axis, contributing to the reduced axial dimension of the drive unit. This configuration supports efficient space utilization within the vehicle.
The drive apparatus includes several enhancements, such as a torque limiter and parking gear for improved control and safety. A second drive unit with an additional electric motor can be included to drive the other set of wheels, providing flexibility in vehicle design. The power transmission mechanism features gears that mesh or connect through a member, ensuring efficient torque transfer and load management, further contributing to the system's compactness and functionality.