Motorcycle Intake Structure for Vibration-Resistant Throttle Measurement
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Solution Overview
Problem
Conventional motorcycle intake structures face issues with accurately measuring throttle grip operation due to vibrations, leading to incorrect measurements and a compromised exterior appearance, especially in naked or sports-type motorcycles, and require a large area for component arrangement which complicates heat management and air cleaner placement.
Innovation Solution
The intake structure features a throttle body with throttle bores arranged in the vehicle width direction, a measuring device rotating about a parallel shaft, and an electric motor positioned behind the throttle body, with a fuel supply pipe connecting the cylinder and motor, allowing for reliable throttle measurement and compact component arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the accelerator position sensor is arranged outside the main frame to measure throttle grip operation, then the measurement function is provided, but the outer appearance is compromised and the sensor is easily damaged
Solution Approach 1:
The patent relocates the accelerator position sensor from an external arrangement to an internal position within the throttle body, utilizing the three-dimensional space inside the vehicle frame. This dimensional repositioning allows the sensor to remain protected and aesthetically concealed while maintaining its measurement function through the throttle cable connection.
2Temperature
If the electric motor is arranged below the throttle body to protect it from engine heat, then heat protection is improved, but the required area for component layout increases
Solution Approach 1:
The patent nests the electric motor within the throttle body structure, positioning it in the rear portion of the throttle body housing. This nested arrangement allows the motor to be protected from engine heat by the throttle body's structural positioning while utilizing existing space, thereby avoiding the need for additional layout area.
Solution Approach 2:
The patent merges the electric motor with the throttle body into a single integrated assembly, where the motor is positioned within the throttle body's structural envelope. This combination allows shared space utilization and eliminates the need for separate protected zones for the motor.
3Adaptability or versatility
If the electric motor is arranged between the head cover and air cleaner box to improve layout freedom, then layout flexibility is improved, but the air cleaner box size must be reduced
Solution Approach 1:
The patent relocates the electric motor from the space between the head cover and air cleaner box to the rear portion of the throttle body, utilizing the longitudinal dimension of the throttle body instead. This dimensional shift preserves air cleaner box volume while achieving layout flexibility through alternative spatial utilization.
Data Source
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AI summary
A motorcycle includes a head pipe, a vehicle body frame including a pair of left and right main flames extending rearward from the head pipe, and an engine disposed below the vehicle body frame and including a cylinder having an inclined cylinder axis, and an intake device. The intake device includes: an air cleaner box disposed above the engine and the main frames; a throttle body provided with a plurality of throttle bores formed and arranged in a vehicle width direction of the vehicle body frame and a valve shaft penetrating the throttle bores so as to extend in the vehicle width direction of the vehicle body frame, the throttle body being located on a rear side of the engine and between the pair of left and right main frames and configured to guide intake air from the air cleaner box to the engine; and a measuring device located on a rear side of the throttle body and configured to rotate about a rotational shaft parallel to the valve shaft to thereby measure a throttle operation amount.