Engine Throttle Body Case Overlap Reducing Intake Passage Volume
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Solution Overview
Problem
Existing engine designs face challenges in reducing the volume of the intake passage between the throttle valve and the combustion chamber, which affects engine output and combustion stability, especially during low load operations.
Innovation Solution
The engine design incorporates a throttle body with a case that overlaps the intake port, allowing the throttle valve to approach the intake port closely, and a deceleration mechanism with gears positioned to avoid interference, enabling a compact layout and efficient use of space around the cylinder head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the volume of the intake passage between the throttle valve and the combustion chamber is reduced, then engine output and combustion stability improve, but the throttle valve cannot approach the intake port closely enough
Solution Approach 1:
The case is designed to overlap with the intake port as seen in a side view, utilizing vertical space rather than horizontal space. This allows the throttle valve to approach the intake port more closely without increasing the overall engine footprint, thereby reducing the intake passage volume while maintaining adequate clearance for the drive member's displacement.
2Volume of moving object
If the case overlaps with the intake port to reduce intake passage volume, then the drive member may interfere with the case during displacement
Solution Approach 1:
The case is designed with specific local clearances and dimensions that do not interfere with the drive member at the time of displacement. The case overlaps with the intake port in certain regions while maintaining adequate spacing in other regions where the drive member moves, allowing both objectives to be achieved simultaneously.
3Area of stationary object
If the drive motor is positioned close to the intake port to reduce overall engine size, then the drive motor interferes with the intake port
Solution Approach 1:
The deceleration mechanism consisting of the first gear and second gear is positioned between the drive member and the drive motor. This intermediary mechanism allows the drive motor to be positioned away from the intake port, avoiding interference while still transmitting drive force to the throttle valve through the gear system.
4Object-affected harmful factors
If the deceleration mechanism is disposed between the drive member and the drive motor, then the drive motor can be positioned away from the intake port, but the overall engine size increases
Solution Approach 1:
The deceleration mechanism and drive motor are positioned in the vertical dimension rather than extending the horizontal footprint. The drive shaft of the drive motor is positioned on the cylinder head side of an imaginary plane that includes the outer end of the intake port, utilizing vertical space to accommodate the additional components without significantly increasing the overall engine size.
Data Source
AI summary
An engine includes: a cylinder head that forms an intake port connected to a combustion chamber; a throttle body that is joined to the intake port and adjusts a degree of an opening of an intake passage by rotating a throttle vale around a rotation axis of a valve shaft, the throttle vale being fixed to the valve shaft; and a case that stores a drive member and supports a drive motor, the drive member being fixed to the valve shaft, the drive motor generating a drive force that is transmitted to the drive member. The case overlaps with the intake port as seen in a side view. Accordingly, in the engine, it is possible to reduce the volume of the intake passage between the throttle valve and the combustion chamber.