Variable Valve Duration Control via Eccentric Slider Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing continuous variable valve lift (CVVL) and variable valve timing (CVVT) systems are complex and costly, failing to efficiently adjust valve opening duration based on engine operation conditions.
Innovation Solution
A continuous variable valve duration apparatus with a camshaft, wheels, cam portions, and slider housings, featuring a variable phase angle and controlled by an eccentric control shaft and motor, allowing for adjustable valve opening duration without extensive modification to existing engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If general CVVL and CVVT systems are used to achieve optimal valve operation depending on engine speed, then valve timing and lift can be adjusted, but the construction becomes complicated and manufacturing cost increases
Solution Approach 1:
The patent combines the camshaft, wheels, cam portions, and slider housings into an integrated assembly where the camshaft rotates within the slider housings that are mounted on the wheels. This merging of components achieves continuous variable valve duration control without requiring separate complex CVVL and CVVT systems, thereby reducing construction complexity while maintaining adaptability
Solution Approach 2:
The apparatus serves multiple functions through a single integrated design: the camshaft with variable phase angle controls both valve timing and duration, the slider housings provide both support and adjustment mechanisms, and the entire assembly adapts to different engine speeds. This multi-functionality eliminates the need for separate specialized systems, reducing overall device complexity
2Adaptability or versatility
If general CVVL and CVVT systems are used to achieve optimal valve operation depending on engine speed, then valve timing and lift can be adjusted, but manufacturing cost increases
Solution Approach 1:
By merging the camshaft, wheels, cam portions, and slider housings into a single integrated apparatus, the patent reduces the total number of components that need to be manufactured and assembled. This consolidation lowers manufacturing costs compared to producing separate CVVL and CVVT systems while maintaining the capability for valve operation adjustment
Solution Approach 2:
The universal design of the apparatus that can adjust valve duration and timing through a single integrated mechanism reduces manufacturing complexity and cost. The same basic structure serves multiple valve control functions across different engine speeds, eliminating the need for multiple specialized components
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
The apparatus simplifies valve duration adjustment, reduces engine valve train height, enhances productivity, and lowers production costs by enabling flexible valve operation based on engine conditions with a compact design.
Implementation Method 1
a control portion selectively moving the slider housings so as to change relative position of a rotation center of the inner brackets
Data Source
AI summary
A continuous variable valve duration apparatus includes a camshaft, a plurality of wheels mounted to the camshaft, and a wheel pin, a plurality of cam portions of which a cam and a cam pin are formed thereto respectively, of which the camshaft is inserted thereto, and of which relative phase angle with respect to the camshaft is variable a plurality of inner brackets including a first pin guide hole and a second pin guide hole and a wheel pin connected to the wheel respectively and a cam pin connected to the cam respectively are slidably inserted into the first pin guide hole and the second pin guide hole respectively, a plurality of a slider housings of which the each inner bracket is rotatably inserted thereto respectively, and rotatably configured around a hinge hole formed a side of a cam cap and a control portion selectively moving the slider housings.