Drive unit of a vehicle which can be driven by muscle power and / or motor power

The drive unit's coaxial design with an intermediate gear system addresses the challenge of compactness and efficiency in vehicles, providing flexible power transmission and reduced weight through a spur gear system.

WO2025214809A1 Publication Date: 2025-10-16ROBERT BOSCH GMBH
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Patent Information

Application Number
PCT/EP2025/058788
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-04-10
Filing Date
2025-04-01
Publication Date
2025-10-16

AI Technical Summary

Technical Problem

Existing drive units for vehicles powered by human and/or motor power, such as electric bicycles, face challenges in achieving a compact design while maintaining high power transmission efficiency and flexibility for different loads.

Method used

A drive unit design featuring a coaxial arrangement of the motor output shaft and output shaft, utilizing a transmission with an intermediate shaft and gear, including an intermediate gear, allows for torque transmission via a spur gear system, enabling a compact and flexible design with adjustable gear ratios.

Benefits of technology

The design achieves a compact, efficient, and cost-effective drive unit with high power transmission capabilities, allowing for optimal positioning of the motor and reduced weight, while maintaining a simple and robust construction.

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Abstract

The invention relates to a drive unit of a vehicle (100) which can be driven by muscle power and / or motor power, in particular an electric bicycle, comprising a motor (2) having a driven shaft (22), an output shaft (3) and a transmission (4), wherein the transmission is designed to transmit torque between the driven shaft and the output shaft, wherein the driven shaft is arranged coaxially to the output shaft, wherein the transmission has an intermediate shaft (45) which is arranged parallel to the output shaft, wherein the transmission also has an intermediate gearwheel (49) which is arranged between the intermediate shaft and the output shaft, and wherein the transmission is designed to transmit torque between the driven shaft and the output shaft via the intermediate shaft and via the intermediate gearwheel.
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