Dirt Bike Engine Frame Brace for Stability
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Solution Overview
Problem
The existing connection between the engine housing and the frame of dirt bikes, typically secured by only three bolts, is weak, especially under full rider weight, and lacks an engine cradle, necessitating a reinforcement to enhance stability and prevent engine pull-out.
Innovation Solution
A brace is designed to overlie the engine with mounting holes aligned with the engine and frame holes, reinforced by bolts, and features a rear anchor to securely attach to the frame, increasing the clamping area and preventing engine pull-out, fabricated from stamped metal for simplicity and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only three bolts are used to connect the engine housing to the frame, then the device complexity is reduced, but the connection strength and stability deteriorate
Solution Approach 1:
The connection structure is segmented into multiple independent attachment points: two mounting holes for bolts and one rear anchor hole, distributing the load across separate locations rather than relying on a single connection method
Solution Approach 2:
The connection is extended from a single-plane bolt arrangement to a multi-dimensional structure by adding the rear anchor that engages with the frame in a different spatial orientation, creating a more robust three-dimensional connection geometry
2Ease of manufacture
If a simple bolt connection is used, then the ease of manufacture is improved, but the reliability under rider weight deteriorates
Solution Approach 1:
The attachment system is divided into multiple functional elements (mounting holes, rear anchor) that work together to distribute mechanical stress, improving reliability while maintaining manufacturing simplicity through standard hole and anchor geometries
Solution Approach 2:
The rear anchor serves as a pre-positioned structural element that engages with the frame to prevent engine pull-out before it can occur during operation, providing proactive support against anticipated rider weight loads
3Strength
If the clamping area is increased with additional mounting holes, then the connection strength is improved, but the device complexity increases
Solution Approach 1:
The brace body serves multiple functions simultaneously: it provides mounting holes for bolt attachment, extends the clamping area, and incorporates the rear anchor for additional engagement, consolidating what could be separate components into a single multi-functional element
Data Source
AI summary
A brace for strengthening a connection between an engine and a frame of a motorcycle includes a body that is configured to overlie the engine. The body has a first mounting hole and a second mounting hole in spaced relationship with one another. The first and second mounting holes are configured to be aligned with mounting holes of the engine and frame for receiving bolts to connect the brace, the engine and the frame to one another. A rear anchor extends perpendicularly from the body for overlying and engaging a portion of the frame.