Throttle Valve Cooling via Radial Flow Path Nesting
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Solution Overview
Problem
The existing throttle valve control devices face challenges in effectively cooling the bearing of the throttle shaft while preventing an increase in the size of the throttle body, particularly due to the overlap of the cooling water flow path with the bearing when viewed from the airflow direction.
Innovation Solution
A throttle valve control device is designed with a flow path for a heat exchange medium along the outer periphery of the intake passage, overlapping with the second bearing, and the inlet and outlet portions of the flow path are positioned to sandwich the first bearing, preventing an increase in the throttle body's size by ensuring efficient cooling of both bearings without overlapping with the larger diameter bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cooling water flow path is provided to protect the bearing from high-temperature intake air, then the heat resistance of the bearing is improved, but the throttle body becomes large in the air flow direction
Solution Approach 1:
The cooling water flow path is positioned to overlap with the bearing when viewed from the air flow direction, utilizing the radial dimension rather than extending axially. This allows the cooling function to be achieved without increasing the throttle body's length in the air flow direction, resolving the contradiction between bearing protection and compact dimensions.
Solution Approach 2:
The cooling water flow path is nested within the existing throttle body structure, with the inlet and outlet portions positioned to sandwich the bearing. This nested arrangement allows the cooling system to be integrated into the existing geometry without requiring additional axial space, maintaining compact dimensions while providing effective cooling.
2Reliability
If the flow path overlaps with the second bearing to cool it effectively, then the cooling efficiency is improved, but the structural complexity increases
Solution Approach 1:
The cooling water flow path serves multiple functions simultaneously: it cools the second bearing through direct overlap, cools the first bearing through the sandwiched inlet and outlet portions, and maintains compact overall dimensions. This multi-functionality reduces the need for separate cooling systems for each bearing, simplifying the overall structure despite the sophisticated flow path arrangement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for effective cooling of the throttle shaft bearings while maintaining a compact size of the throttle body, enhancing heat resistance and preventing excessive growth in the throttle body's dimensions.
Implementation Method 1
A flow path through which a heat exchange medium flows is formed in the throttle body
Data Source
AI summary
An object of the present application invention is to provide a throttle valve control device capable of effectively cooling a bearing of a throttle shaft while preventing an increase in size of a throttle body. Therefore, in a throttle valve control device in which flow paths 5T1 to 5T3 through which a heat exchange medium flows are formed in a throttle body 5, the diameter of a first bearing 8 of a throttle shaft 3 is greater than the diameter of a second bearing 9, the flow paths 5T1 to 5T3 are disposed along an outer periphery of an intake passage 1 to overlap with the second bearing 9 when viewed from a flow direction of the intake passage 1, and an inlet portion 5T1 and the outlet portion 5T3 of the flow paths 5T1 to 5T3 are disposed to sandwich the first bearing 8.