Auxiliary EV Drive Gearbox for Low-Speed Power Reduction
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Solution Overview
Problem
Existing new energy vehicles consume excessive power when traveling at low speeds due to the motor operating in a low-efficiency state, as they rely on a single driving mechanism that is inefficient at low speeds.
Innovation Solution
An auxiliary driving mechanism is introduced, comprising an auxiliary motor, multi-speed gearbox, and clutch, allowing power transmission through multiple reducing gear sets to reduce power consumption by using the auxiliary motor at low speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single motor is used to drive the vehicle at low speeds, then the vehicle can travel at low speeds, but the motor operates in a low-efficiency state resulting in high power consumption
Solution Approach 1:
The driving system is segmented into two independent motors: a main motor and an auxiliary motor. The auxiliary motor specifically handles low-speed driving tasks, allowing the main motor to operate in its efficient high-speed range or remain idle, thereby resolving the efficiency-power consumption contradiction
Solution Approach 2:
The system dynamically switches between different driving modes based on vehicle speed requirements. At low speeds, the auxiliary motor drives the vehicle through the multi-speed gearbox. At higher speeds, the main motor takes over. This dynamic allocation optimizes overall system efficiency across different operating conditions
2Use of energy by moving object
If an auxiliary driving mechanism with multi-speed gearbox is added, then power consumption at low speeds is reduced, but the device complexity increases
Solution Approach 1:
The auxiliary motor is integrated with an existing multi-speed gearbox structure, allowing the same gearbox to serve both the auxiliary motor at low speeds and the main motor at high speeds. This multi-functional design reduces the need for completely separate transmission systems, thereby limiting the increase in device complexity
Solution Approach 2:
A clutch mechanism is introduced as an intermediary component to selectively engage or disengage the auxiliary motor from the drivetrain. This allows smooth transition between driving modes and simplifies control logic, preventing the system from becoming overly complex
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces power consumption during low-speed travel by utilizing the auxiliary motor and multiple-stage gear reduction, maintaining efficient operation with lower power requirements.
Implementation Method 1
a clutch is arranged on the auxiliary drive shaft; the clutch allows only one of the first-stage reducing gear sets to transmit the power of the auxiliary motor or disconnect the power between the auxiliary drive shaft and the intermediate shaft
Implementation Method 2
a plurality of first-stage reducing gear sets are arranged between the auxiliary drive shaft and the intermediate shaft; a pair of transmission gear sets are arranged between the intermediate shaft and the connecting shaft
Data Source
AI summary
Disclosed is an auxiliary driving mechanism of a new energy vehicle, including a main motor, a reduction gear, a differential gear, an auxiliary motor, and a multi-speed gearbox. The multi-speed gearbox includes a housing, an auxiliary drive shaft, an intermediate shaft, and a connecting shaft, the auxiliary drive shaft is connected to the auxiliary motor, a plurality of first-stage reducing gear sets are arranged between the auxiliary drive shaft and the intermediate shaft, and a clutch is arranged on the auxiliary drive shaft; the clutch allows only one of the first-stage reducing gear sets to transmit the power of the auxiliary motor or disconnect the power between the auxiliary drive shaft and the intermediate shaft; a pair of transmission gear sets are arranged between the intermediate shaft and the connecting shaft.