Bajaj Auto has patented an innovative electric vehicle design with a unique transmission system closely coupled to the electric motor on the same side of the rear wheel. The rear wheel is connected to the frame using a swing arm that also functions as a transmission casing, forming an integral part of the suspension system. GlobalData’s report on Bajaj Auto gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Bajaj Auto, Battery pack swapping was a key innovation area identified from patents. Bajaj Auto's grant share as of February 2024 was 34%. Grant share is based on the ratio of number of grants to total number of patents.

Electric vehicle with integrated electric motor and transmission system

Source: United States Patent and Trademark Office (USPTO). Credit: Bajaj Auto Ltd

The granted patent (Publication Number: US11884159B2) describes an electric vehicle with a unique design that includes a frame, an electric battery module, an electric motor, a transmission system, and a rear wheel. The electric motor and transmission system are located on the same side of the rear wheel, with the rear wheel connected to the frame using a swing arm that also functions as a transmission casing. The swing arm extends horizontally, mounting on the rear wheel and pivotally on the frame to form a structural element of the suspension system. The transmission system is a single speed, multi-stage transmission that transmits torque to the rear wheel.

Furthermore, the patent details the close coupling of the transmission system and electric motor within the dimensions of the rear wheel, allowing for efficient power transmission. The swing arm is connected to the frame at pivot joints to enable vertical pivoting for shock absorption. The suspension system includes shock absorbers mounted at the transmission casing, and the power transmission from the electric motor to the rear wheel can be achieved using a chain or belt drive. The design also includes specific features such as bearings supporting the input gear and the use of a cover on the transmission casing to direct airflow towards the electric motor. Additionally, the electric battery module is mounted centrally and below a rear frame portion for optimal weight distribution and balance in the electric vehicle.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.