Saddle Vehicle Engine Collar Fastening Gap Design
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Solution Overview
Problem
In saddle type vehicles, rigid engine mounting leads to shearing deformation and plastic deformation of fastening bolts due to uneven contact pressure distribution, causing instability in seating face contact and vibrations, and existing solutions are costly and labor-intensive.
Innovation Solution
A saddle type vehicle engine fastening structure with a collar and bolt configuration that includes a gap between the collar and bolt at specific locations to disperse shearing stress, featuring stepped diameter portions on the collar and bolt to moderate stress concentration and facilitate positioning, reducing the likelihood of shearing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid mounting is used to stabilize vehicle body vibration, then vibration stability is improved, but the fastening bolt undergoes shearing deformation and plastic deformation due to uneven contact pressure distribution
Solution Approach 1:
The collar is designed with non-uniform wall thickness, creating thicker portions (protrusions) at specific locations and thinner portions at others. This local quality variation allows the collar to distribute contact pressure more evenly with the bolt, preventing stress concentration that would cause shearing and plastic deformation, while maintaining rigid mounting for vibration stability.
Solution Approach 2:
The collar's geometric parameters are modified by creating protrusions through non-uniform wall thickness distribution. This changes the physical parameters of the collar structure, allowing it to better accommodate the bolt and distribute loads uniformly, thereby protecting the bolt from deformation while preserving rigid mounting characteristics.
2Manufacturing precision
If a wedge-like projection is provided on the collar to suppress relative displacement, then positioning precision is improved, but the cost and labor for working the collar increase
Solution Approach 1:
Instead of adding complex wedge-like projections that require additional working steps, the invention utilizes the existing collar structure with non-uniform wall thickness. The protrusions are formed by varying the wall thickness locally, which can be achieved through simpler manufacturing processes such as casting or forging variations, thereby maintaining positioning precision while reducing manufacturing cost and labor.
3Stability of the object's composition
If the collar and bolt are tightly fitted to suppress relative displacement, then positioning stability is improved, but shearing stress concentrates on the bolt causing deformation
Solution Approach 1:
The collar features localized protrusions created by non-uniform wall thickness at specific positions. These protrusions make contact with the bolt at discrete points, providing stable positioning while distributing the shearing stress along the contact surfaces rather than concentrating it at a single point, thereby preventing bolt deformation.
Solution Approach 2:
The solution moves from a uniform one-dimensional fit to a varied cross-sectional geometry. By changing the wall thickness in different radial directions, the collar creates a multi-dimensional stress distribution pattern that reduces peak stresses while maintaining overall positioning stability.
Data Source
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AI summary
Object To provide a saddle type vehicle which has an engine fastening structure which stabilizes seating face contact between a frame and a collar and between an engine and the collar and is low in cost and easy in fastening working. Solving Means In a saddle type vehicle which includes an engine supporting portion (707a) provided on a vehicle body frame, and an engine side female threaded portion (703a), and a collar (705a) interposed between the engine supporting portion (707a) and the engine side female threaded portion (703a), and wherein the engine supporting portion (707a), collar (705a) and engine side female threaded portion (703a) are fastened by a bolt (709a), at least at locations between the collar (705a) and the bolt (709a) which oppose to a boundary between the collar (705a) and the engine supporting portion (707a) and another boundary between the collar (705a) and the engine side female threaded portion (703a), a gap (741) greater than that at any other location is provided.