Monocoque Frame Air Cleaner Sealing via Elastic Lid
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Solution Overview
Problem
Conventional saddle type vehicles with monocoque structures face challenges in maintaining sealing properties, especially with multi-cylinder engines where tolerance differences between cylinder units complicate the sealing connection between the engine and air cleaner.
Innovation Solution
A saddle type vehicle design featuring a main frame with a built-in air cleaner, utilizing a lid member with an elastic member connecting two plate members, a seal lip, and a fixing member to secure the sealing connection, allowing for tolerance accommodation and vibration absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate member is used to seal the air system in a monocoque main frame, then the sealing property can be improved, but the device complexity increases and the ease of manufacture deteriorates
Solution Approach 1:
The air cleaner case is integrated as a built-in component of the monocoque main frame, merging the air cleaner function with the frame structure. This eliminates the need for separate sealing members while maintaining sealing effectiveness through the unified structural design.
Solution Approach 2:
The main frame serves multiple functions: it provides structural support, houses the air cleaner, and maintains sealing properties. The air cleaner case is designed to fulfill both filtration and sealing roles simultaneously, reducing the need for additional dedicated sealing components.
2Reliability
If a separate member is used to seal the air system, then the sealing property can be improved, but the ease of manufacture deteriorates
Solution Approach 1:
The air cleaner case is integrated as a built-in component of the monocoque main frame, merging the air cleaner function with the frame structure. This eliminates the need for separate sealing members while maintaining sealing effectiveness through the unified structural design.
3Device complexity
If the air cleaner is built into the monocoque main frame, then the device complexity is reduced, but the sealing connection becomes difficult due to engine vibration and tolerance differences
Solution Approach 1:
A flexible sealing lip is used at the interface between the air cleaner case and the monocoque main frame. This flexible element can accommodate vibrations from the engine and tolerance variations in multi-cylinder configurations while maintaining effective sealing, resolving the contradiction between simplified structure and reliable sealing connection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances sealing properties and durability while allowing for effective assembly and disassembly, maintaining sealing integrity over time and absorbing engine vibrations.
Implementation Method 1
an elastic member provided between the first plate member and the second plate member
Data Source
AI summary
A saddle type vehicle including a frame of a monocoque structure having an air cleaner wherein the sealing property can be secured. An air cleaner includes a filter element disposed in a hollow main frame to partition the main frame into a dirty side region and a clean side region. An intake path member connects an engine below the main frame to the clean side region. A communicating opening for communicating with the engine is formed on a lower face side of the clean side region. The communicating opening is covered with a lid member. The lid member includes a first plate member with a communicating hole in which the intake path member to the engine is inserted, a second plate member for surrounding an outer periphery of the first plate member, and an elastic member provided between the first plate member and the second plate member.