Motorcycle Exhaust Gas Sensor Arrangement for Offset Pipe Protection
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Solution Overview
Problem
Existing exhaust gas sensor arrangement structures for motorcycles are inadequate when the exhaust pipe is offset from the vehicle center, as they fail to provide sufficient protection for the sensor in such configurations.
Innovation Solution
The exhaust gas sensor arrangement structure involves positioning sensors on the upper halves of exhaust pipes between the internal combustion engine and bottom frame portions, with center axes inclined outward from the vehicle center vertical line, and setting these angles to acute angles less than half a right angle, ensuring the sensors are sandwiched between the engine and frame, and partially covered by the oil pan and frame for protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the exhaust pipe is arranged on one side of the vehicle in an offset manner, then the exhaust pipe cannot pass the center in the vehicle width direction, but the exhaust gas sensor cannot be adequately protected in this configuration
Solution Approach 1:
The exhaust gas sensor is arranged in the vertical dimension below the exhaust pipe rather than on the lateral surface, allowing protection from multiple directions (front, rear, left, right) while accommodating offset exhaust pipe arrangements. This spatial repositioning enables the sensor to be protected by both the exhaust pipe above and the vehicle frame below.
Solution Approach 2:
The exhaust gas sensor is nested within the space formed by the exhaust pipe and the vehicle frame, positioned below the exhaust pipe and above the frame. This nested arrangement allows the sensor to be protected by surrounding structures from multiple directions simultaneously.
2Reliability
If the exhaust gas sensor is arranged on the upper surface of the exhaust pipe having a large width, then the sensor can be protected by the exhaust pipe, but this arrangement is not feasible when the exhaust pipe cannot be arranged centrally or does not have sufficient width
Solution Approach 1:
The sensor arrangement moves from lateral placement on the exhaust pipe surface to vertical placement below the exhaust pipe, enabling protection without requiring the exhaust pipe to be centrally positioned or have sufficient lateral width.
Solution Approach 2:
The sensor can be positioned at asymmetric locations below the exhaust pipe (left or right side) depending on the exhaust pipe arrangement, allowing adaptation to asymmetric exhaust pipe configurations while maintaining protection.
3Reliability
If the exhaust gas sensor is arranged below the exhaust pipe between the engine and bottom frame portions, then the sensor can be protected from multiple directions, but the sensor mounting space is reduced
Solution Approach 1:
The sensor is positioned in a specific localized space below the exhaust pipe where it can be protected from multiple directions. This localized placement optimizes protection while minimizing the overall space required for sensor installation.
Data Source
AI summary
An exhaust gas sensor arrangement structure for a motorcycle includes a vehicle body frame, an internal combustion engine suspended on the vehicle body frame between front and rear wheels and exhaust pipes extending toward a rear side in the longitudinal direction of a vehicle from a front side of the internal combustion engine in the longitudinal direction of the vehicle in a state where the exhaust pipes extend below the internal combustion engine. Exhaust gas sensors are arranged on upper halves of the exhaust pipes arranged between the internal combustion engine and the bottom frame portions as viewed from a front side in the longitudinal direction of the vehicle in a state where the exhaust gas sensors are sandwiched between the internal combustion engine and the bottom frame portions as viewed from a front side in the longitudinal direction of the vehicle.