Integrated Throttle Valve and Valve Layout for Engine Leak Control
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Solution Overview
Problem
Existing engines face issues with air leakage in throttle valve assemblies due to aging hoses, poor sealing, and imbalanced lubricant pressure leading to coolant and lubricant leakage, along with inadequate intake and exhaust system arrangements affecting engine performance and structure compactness.
Innovation Solution
The engine design includes a throttle valve assembly with integrated molding for improved sealing, optimized valve angles for compact structure, a local pressure reduction groove in the oil pump assembly for balanced lubricant pressure, and a camshaft lubrication system with a sump structure and lubricant channel to prevent leakage, along with ventilation holes to equalize air pressure across the ignition coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hose is used to control air intake in the throttle valve assembly, then air flow control is achieved, but air leakage occurs due to aging and weakened sealing
Solution Approach 1:
The patent removes the hose component from the throttle valve assembly and integrates the air flow control function directly into the valve body structure, eliminating the sealing interface between hose and valve body that causes leakage over time
Solution Approach 2:
The throttle valve body and air passage are integrated into a single molded component, combining the flow control function and sealing function into one unified structure, eliminating multiple sealing interfaces
2Volume of moving object
If the engine structure is made compact, then space utilization is improved, but the arrangement of intake and exhaust systems becomes more difficult
Solution Approach 1:
The patent arranges the intake and exhaust valves and their passages in three-dimensional space with optimized spatial positioning, utilizing vertical and radial dimensions to achieve compact layout while maintaining proper flow paths
Solution Approach 2:
The intake and exhaust systems are segmented into separate functional zones within the valve assembly, with dedicated passages and valve mechanisms that can be independently optimized for compact arrangement
3Ease of operation
If lubricant is injected back into the crankcase through drilled orifice holes, then lubrication is provided, but localized lubricant pressure increases causing coolant and lubricant leakage
Solution Approach 1:
The patent introduces a pressure reduction groove with specific geometric parameters (depth, width, position) that creates a localized low-pressure zone in the oil pump, allowing lubricant pressure to be controlled locally without affecting overall lubrication performance
Solution Approach 2:
The pressure reduction groove acts as an intermediary structure between the lubricant supply and the crankcase, mediating the pressure differential and preventing direct high-pressure injection that causes leakage
Data Source
AI summary
An internal combustion engine includes a throttle valve assembly having a main passage and an idle air passage. The main passage is in fluid communication with the intake valve, air being intermittently input into a combustion space through the main passage based on position of an intake valve. The idle air passage is integrally formed in the throttle valve body, and is controlled by a motor to selectively introduce air into the main passage downstream of the throttle plate. For a cylinder hole diameter in the range from 70 mm to 74 mm, both the intake valve angle defined between the intake valve axis and the cylinder axis and the exhaust valve angle defined between the exhaust valve axis and the cylinder axis are in the range from 11 degrees to 15 degrees.