Battery Case Positioning for Saddled Vehicles
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Solution Overview
Problem
The existing layout of saddled vehicles, particularly motorcycles, faces challenges in effectively utilizing the space between the right and left vehicle body frames due to the placement of the fuel tank and other components, which limits the freedom in battery case placement.
Innovation Solution
The battery case is positioned between the head pipe and the fuel tank, with the fuel tank and battery case partially overlapping, and the battery case is stored in a recessed portion of the fuel tank, optimizing the shape to minimize fuel tank capacity reduction and increase front wheel load ratio, while ensuring protection and maintainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the battery case is disposed between the right and left frame pipes, then the battery can be supported in a compact layout, but the degree of freedom in layout is reduced due to the presence of electric components such as ECU and ignition coil in that space
Solution Approach 1:
The battery case is positioned in the longitudinal dimension (front-rear direction) between the head pipe and fuel tank, rather than being constrained to the lateral space between frame pipes. This dimensional shift allows the battery case to occupy unused longitudinal space without interfering with laterally positioned electric components.
Solution Approach 2:
The battery case is nested within the space defined by the vehicle body frame structure, specifically utilizing the recessed portion of the fuel tank and the space between the head pipe and fuel tank. This nesting approach allows efficient space utilization within the existing structural constraints.
2Force
If the battery case is positioned between the head pipe and fuel tank with overlapping disposition, then the battery case can be disposed nearer the front side increasing front wheel load ratio, but the fuel tank capacity may be reduced
Solution Approach 1:
The fuel tank is designed with a recessed portion at its front end that specifically accommodates the battery case. This localized modification allows the battery case to be positioned in the overlapping region without significantly reducing the overall fuel tank capacity, as the recessed portion is strategically located where it minimizes fuel storage impact.
Solution Approach 2:
The battery case and fuel tank are arranged to partially overlap in the lateral direction while maintaining distinct longitudinal positioning. The battery case is stored in the recessed portion of the fuel tank, creating a three-dimensional arrangement that allows both components to coexist with minimal mutual interference.
3Length of moving object
If the fuel tank and battery case are disposed to partially overlap, then the longitudinal dimension can be shortened, but the shape complexity of the fuel tank increases
Solution Approach 1:
The battery case is nested within the recessed portion of the fuel tank, allowing the two components to occupy overlapping space. This nesting arrangement shortens the overall longitudinal dimension of the vehicle body while the fuel tank's shape complexity is managed by concentrating the modification to a specific recessed region rather than redesigning the entire tank.
Solution Approach 2:
The fuel tank shape is modified locally by creating a recessed portion at the front end, rather than changing the overall tank geometry. This localized shape modification achieves the space-saving overlap arrangement while minimizing the increase in overall shape complexity.
4Object-affected harmful factors
If the battery case is positioned in the recessed portion of the fuel tank, then the right and left of the battery case can be protected by the fuel tank, but access to the battery case becomes more difficult
Solution Approach 1:
The tank cover is segmented into a main cover portion and a detachable maintenance lid. The maintenance lid can be removed independently to provide access to the battery case, while the main cover remains in place to maintain the protective enclosure and prevent water ingress to both the fuel tank and battery case.
Solution Approach 2:
The maintenance lid acts as an intermediary access point between the external environment and the battery case. It provides a controlled opening that allows maintenance personnel to access the battery case without compromising the overall protective sealing of the fuel tank and battery case assembly.
Data Source
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AI summary
The present invention provides a battery case for saddled vehicles configured to effectively utilize a space between right and left vehicle body frames. According to the present invention, in a battery case (70) mounted in a saddled vehicle (1) including a pair of right and left main frames (2a) extending rearward and downward from a head pipe (9) and a fuel tank (3) positioned behind the head pipe (9) and above the main frames (2a), in which at least a battery (B) is stored, the battery case (70) is arranged between the head pipe (9) and the fuel tank (3), and the fuel tank (3) and the battery case (70) are disposed to partially overlap with each other in a side view of a vehicle body. A rear portion of the battery case (70) is stored in a recessed portion (3b) formed in a front portion of the fuel tank (3) in the center in a vehicle width direction. The battery case (70) includes a case portion (72) for storing a battery (B), and a cover portion (71) for covering an upper opening of the case portion (72), and the case portion (72) and the cover portion (71) are configured to partially overlap with each other in the side view of the vehicle body.