Throttle Device with Distributed Transmission Mechanism
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Solution Overview
Problem
Conventional throttle devices for multi-cylinder engines face challenges in compactness due to the concentration of gears, sensors, and actuators, which increases the full width and reduces detection accuracy, making them difficult to mount on two-wheeled vehicles and affecting the accuracy of throttle opening degree detection.
Innovation Solution
The throttle device is designed with the rotation transmission mechanism between two throttle bodies and the throttle opening degree sensor within the installation width of either throttle body, allowing the actuator to be accommodated in one body and the sensor to detect rotational displacement without protruding, thus reducing the full width and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotation transmission mechanism, actuator, and throttle position sensor are concentratedly arranged in the center of the throttle body, then the rotational transmission function is achieved, but the full width of the throttle body increases making it difficult to mount on two-wheeled vehicles
Solution Approach 1:
The throttle body is divided into a first throttle body and a second throttle body that are adjacent to each other. The rotation transmission mechanism is disposed at the position where the first and second throttle bodies are adjacent, separating the concentrated arrangement into distributed segments across multiple bodies, thereby reducing the full width of each individual throttle body while maintaining the overall functional arrangement.
2Extent of automation
If the throttle position sensor detects the rotation of the sensor shaft interlocked with the throttle shaft through the gear, then the rotational position is detected, but the detection accuracy is insufficient due to backlash and other error factors
Solution Approach 1:
A lever member is introduced as an intermediary component connected to the throttle shaft. The lever member transmits the rotational displacement of the throttle shaft to the throttle position sensor, providing a direct transmission path that reduces the impact of backlash and other error factors inherent in gear-based direct coupling, thereby improving detection accuracy.
3Extent of automation
If the magnet is disposed at the shaft end of the rotor and the sensor is disposed in the fixed side member opposed to the magnet, then the rotational detection is achieved, but the full width of the throttle device increases and the rotational radius of the detection portion is small reducing accuracy
Solution Approach 1:
The detection arrangement is repositioned from a configuration that increases the full width of the throttle device to one that utilizes the space more efficiently. The lever member connects the throttle shaft to the sensor in a manner that reduces the rotational radius of the detection portion while maintaining detection functionality, effectively utilizing spatial dimensions to reduce overall device width.
Data Source
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AI summary
A throttle device, including: a throttle valve (13) disposed in a plurality of intake passages (12) of a throttle body (11); a throttle shaft (14) supporting the throttle valve (13); a motor (15) for driving the throttle valve (13) to open and close through the throttle shaft(14); a rotation transmission mechanism (20) interposed between the motor (15) and the throttle shaft (14); and a position sensor to detect a displacement in the rotation transmission mechanism (20). The rotation transmission mechanism (20) is disposed at a position where the first and the second throttle bodies (11f, 11s) are adjacent, the motor (15) is disposed within an installation width Ws of either one of the first and the second throttle bodies (11f, 11s), and the throttle opening degree sensor (30) is disposed within an installation width Wt of the other one of the first and the second throttle bodies (11f, 11s).