Single-Piece Snowmobile Hood Injection Molding
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Solution Overview
Problem
Existing snow vehicle hood assemblies are typically composed of multiple components, making them complex and difficult to manufacture as a single, integrated unit, especially when requiring an undercut design which is challenging with conventional manufacturing processes.
Innovation Solution
A single-piece hood assembly for snowmobiles is designed with a lower portion extending rearward and downward and an upper portion extending rearward and upward, both defined by surfaces at positive angles relative to the line of draw, allowing for injection molding and integration of an undercut feature, and secured to the frame via angled bolt holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hood assembly is designed as multiple separate components, then it is easier to manufacture and assemble, but the structural integrity and protection capability are reduced
Solution Approach 1:
The patent combines multiple hood assembly components into a single integrated hood structure that surrounds the engine and associated components. This single-piece design eliminates the need for separate hood components while maintaining structural integrity and protection capability, directly resolving the contradiction between strength and device complexity.
2Ease of manufacture
If a single-piece hood with undercut design is manufactured using conventional processes, then manufacturing complexity increases, but integration and protection are improved
Solution Approach 1:
The patent utilizes injection molding parameters and mold design to successfully manufacture a single-piece hood with undercut features. By changing the manufacturing approach from conventional processes to injection molding with specific parameter settings, the patent achieves both ease of manufacture and improved protection capability without increasing manufacturing complexity.
3Reliability
If multiple hood components are used, then manufacturing flexibility is maintained, but assembly complexity and potential failure points increase
Solution Approach 1:
The single-piece hood design eliminates multiple connections and joints between separate components, thereby reducing potential failure points and improving assembly reliability. The integrated structure maintains manufacturing flexibility while significantly reducing the number of connections required.
4Shape
If a single-piece hood is designed with undercut features, then design flexibility and aesthetics are improved, but manufacturing difficulty increases
Solution Approach 1:
The patent successfully manufactures a single-piece hood with undercut features by optimizing injection molding parameters and mold design. The undercut geometry is achieved through careful control of molding parameters and appropriate mold configuration, demonstrating that design flexibility does not necessarily increase manufacturing difficulty when the right parameters are used.
Data Source
AI summary
A snowmobile includes a frame, at least one ski, a seat, a handlebar connected to the at least one ski via a steering shaft, and a single-piece hood. The single-piece hood includes a forward position located approximately equal to a first horizontal plane, a lower portion that extends rearwardly from the forward position and a top portion that extends rearwardly from the forward position, wherein the bottom portion is located beneath the first horizontal plane and the top portion is located above the first horizontal plane.