Intake Pipe Pressure Sensor Mounting for Vehicle Assembly
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Solution Overview
Problem
In straddle-type vehicles, when the air cleaner is positioned behind the engine, it is difficult to assemble and secure a pressure sensor due to the narrow space and interference with other intake system components.
Innovation Solution
An intake device configuration where a pressure sensor is attached to the outer peripheral surface of an intake pipe, allowing easy assembly and sufficient gap creation between the sensor and other components, using an arm member and hose to absorb engine vibrations and maintain compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the air cleaner is disposed behind the engine, then the layout flexibility is improved, but the assemblability of the pressure sensor deteriorates due to narrow space and interference with other intake system components
Solution Approach 1:
The pressure sensor is mounted on the lateral outer peripheral surface of the intake pipe rather than on the top surface or inside the intake passage. This lateral mounting position utilizes the radial dimension of the intake pipe, creating a new spatial arrangement that resolves the conflict between compact layout and assembly accessibility.
Solution Approach 2:
The intake system is segmented into distinct functional components (air cleaner, throttle body, intake pipe) with the pressure sensor mounted as a separate attachment on the intake pipe's outer surface. This segmentation allows the sensor to be positioned independently from the main intake flow path, facilitating assembly in tight spaces.
2Volume of moving object
If the air cleaner is disposed behind the engine, then the compactness is improved, but the arrangement space for the pressure sensor deteriorates
Solution Approach 1:
The pressure sensor is positioned on the outer peripheral surface of the intake pipe, utilizing the radial dimension rather than consuming additional axial or lateral space. This allows the sensor to be accommodated within the existing footprint of the intake system without increasing overall volume.
Solution Approach 2:
The pressure sensor is nested on the outer surface of the intake pipe, which itself is part of the compact intake system arrangement. The sensor attachment portion is integrated into the pipe's outer surface geometry, allowing the sensor to occupy space that would otherwise be unused external surface area.
3Device complexity
If the pressure sensor is attached to the air cleaner, then the assembly is simplified, but the gap between the pressure sensor and other intake system components cannot be secured
Solution Approach 1:
The pressure sensor is relocated from the air cleaner assembly to the intake pipe, specifically on its outer peripheral surface. This positional change in a different dimension (from top-mounted to side-mounted) naturally creates separation from other intake system components while maintaining assembly simplicity through the integrated attachment portion.
Solution Approach 2:
The intake pipe serves as an intermediary mounting structure between the air cleaner and the engine. By attaching the pressure sensor to this intermediate component's outer surface, the sensor is positioned in a location that is accessible for assembly yet maintains adequate clearance from other intake system components.
Data Source
AI summary
There is provided an intake device, in which an air cleaner is disposed behind an engine and which is configured such that air is introduced from the air cleaner to the engine through an intake passage. The intake device includes: a pressure sensor configured to detect a pressure in the intake passage; a throttle body that forms an upstream side of the intake passage; and an intake pipe that forms a downstream side of the intake passage. An attachment portion to which the pressure sensor is attached is formed on an outer peripheral surface of the intake pipe.