Electric Motorcycle Motor Case Integrated Frame Structure
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Solution Overview
Problem
Conventional electric motorcycles with large and heavy electric motors experience size and stability issues due to protrusion in the vehicle width direction, leading to compromised traveling stability.
Innovation Solution
The electric motor is integrated into the body frame, with the electric motor case serving as a structural component, reducing the overall vehicle size and enhancing stability by forming part of the frame and supporting other components, such as the swing arm and rear wheel suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large and heavy electric motor is mounted to generate larger traveling power, then traveling power is improved, but the electric motor protrudes from the rear wheel in the vehicle width direction, increasing vehicle body size
Solution Approach 1:
The electric motor case is merged with the body frame structure, where the electric motor case forms a part of the frame portion extending rearward from the head pipe. This integration allows the electric motor to be supported by the body frame rather than protruding from the rear wheel, thus generating larger traveling power without increasing vehicle body size in the width direction.
Solution Approach 2:
The electric motor case is positioned along the vehicle length direction (rearward from the head pipe) rather than protruding in the vehicle width direction. This dimensional repositioning allows the electric motor to be accommodated within the existing vehicle envelope, maintaining compact width while providing sufficient space for a larger motor.
2Power
If a large and heavy electric motor is mounted to generate larger traveling power, then traveling power is improved, but the gravity center leans from the center to the electric motor side, deteriorating traveling stability
Solution Approach 1:
The electric motor case serves multiple functions: it houses the electric motor, forms part of the body frame structure, and provides mounting points for other components (swing arm, suspension). This multi-functionality distributes the weight and structural role across the vehicle framework rather than concentrating it at one side, improving traveling stability while supporting a larger motor.
Solution Approach 2:
The electric motor case is positioned asymmetrically along the vehicle length direction (rearward from the head pipe on one side), but the overall vehicle design compensates through symmetric weight distribution in other components. The frame portion extends rearward to balance the gravity center, preventing excessive leaning while accommodating the large motor.
3Volume of moving object
If the electric motor case forms part of the body frame, then vehicle body size is suppressed and traveling stability is enhanced, but the structure becomes more complex
Solution Approach 1:
The electric motor case and body frame are merged into a single integrated structure, where the electric motor case forms a part of the frame portion. This eliminates the need for separate mounting brackets and support structures, reducing the number of parts and assembly steps despite the increased functional integration.
Solution Approach 2:
The electric motor case performs multiple functions including structural support, motor housing, and component mounting. By designing the electric motor case to serve as both a functional housing and a structural frame element, the patent reduces overall structure complexity by eliminating redundant components.
Data Source
AI summary
An electric motorcycle according to the present invention includes a body frame having a head pipe supporting a steering shaft and a frame portion extending substantially rearward from the head pipe, an electric motor generating traveling power to be transmitted to a driving wheel, and an electric motor case housing the electric motor, wherein the electric motor case forms a part of the frame portion.