New Energy Vehicle Reducer
Author:
Release Time:
2025-10-15
As the automotive industry rapidly advances, Environmental pollution caused by carbon emissions is also becoming increasingly severe. Reducing harmful gas emissions from vehicles has become a global consensus, and developing new-energy vehicles is the primary trend shaping the future. Meanwhile, advancements in electric vehicle (EV) gearboxes are directly driving progress in EV technology. These gearboxes play a crucial supporting role in addressing two key challenges facing EV development: extending driving range and enhancing vehicle performance.
The performance of an electric vehicle's powertrain system directly determines how well the vehicle operates—it is the core component of the electric car. A reducer is used to lower rotational speed and increase torque, thereby meeting the demands of various applications. Reducers feature a compact design, high efficiency, accurate and reliable motion transmission, and convenient operation and maintenance. They can also be mass-produced, making them widely applicable across numerous industries. There are many types of reducers; depending on the number of transmission stages, they can be classified into single-stage and multi-stage reducers.
Why a gearbox is needed ？
The motor operating area is an important metric for evaluating automotive motor performance. High rotational speed, high torque, and a wide constant-power speed-regulation range are currently the common goals pursued by motor designers.
Similarly to gasoline-powered cars, The matching reducer can multiply the torque of the drive motor, while a multi-speed gearbox ensures the motor operates within a more efficient speed range, enabling the system to achieve a wider speed range and greater torque.
If electric vehicles didn’t have a reduction gear, the torque delivered to the wheels would be too low—especially when climbing hills or in situations requiring high torque—which would make it difficult to meet practical usage needs. On the other hand, during most of everyday driving, vehicles primarily operate on flat roads. In such cases, opting for a high-torque motor would compromise the goal of achieving cost-effectiveness. That’s where the gearbox comes in—it plays a key role in reducing speed while boosting torque, offering a low-cost solution to this challenge.
How to choose a reducer?
As an important parameter of a powertrain—namely, the transmission ratio—its selection follows these two principles:
( 1 ） The motor's gear ratio and rotational speed must meet the requirement for maximum vehicle speed. The motor's maximum RPM should align with the upper limit of the transmission ratio.
( 2 ） The maximum speed is determined by power balance.
The maximum transmission ratio, calculated based on the vehicle's top speed, and the transmission ratio derived from the motor's maximum power—whichever is lower—will serve as the transmission ratio that meets the system design requirements.
Of course, the above is just a brief description of the main idea. In practice, the specific requirements should be determined based on the vehicle’s needs—such as maximum gradeability, top speed, climbing speed, and acceleration time—first identifying the power demand for the drive motor. Then, by considering the pre-selected efficiency map of the drive motor along with its dynamic output characteristics, combined with the vehicle’s overall economic cruising speed requirement, you can comprehensively evaluate and select an appropriate transmission ratio.
Contact Us
Add：Automobile Industrial Park, Industrial Cluster Area, Changyuan County, Henan Province
