Continuous Variable Valve Duration Apparatus with Segmented Camshaft
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Solution Overview
Problem
Existing continuous variable valve lift (CVVL) and variable valve timing (CVVT) systems are complex and costly, making them inefficient for optimizing valve operation based on engine rotation speed.
Innovation Solution
A continuous variable valve duration apparatus with a simplified design, featuring a camshaft, variable phase cam portions, inner brackets, a slider housing, and a control portion with a planetary gear set and position sensor, allowing for adjustable valve opening duration based on engine operation conditions.
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 camshaft is divided into first and second cam portions that can rotate independently relative to each other. This segmentation allows the intake and exhaust cam portions to be adjusted independently, achieving optimal valve operation for different engine speeds without requiring complex multi-component systems. The independent rotation capability enables simplified construction while maintaining adaptability.
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:
The apparatus combines variable valve timing and variable valve duration functions into a single integrated camshaft system with independently rotatable cam portions. This merging eliminates the need for separate CVVL and CVVT mechanisms, reducing the number of parts, simplifying manufacturing processes, and lowering production costs while maintaining full adaptability for optimal valve operation across different engine speeds.
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 reduces the size and complexity of the valve train, enhances productivity, and lowers production costs by allowing for adjustable valve operation without extensive engine modifications, thereby optimizing engine performance across varying rotation speeds.
Implementation Method 1
a control portion selectively rotating the control shaft so as to control a position of the slider housing
Implementation Method 2
an eccentric plate rotatably connected to the control rod and rotatably inserted into the control slot
Data Source
AI summary
A continuous variable valve duration apparatus may include a camshaft, a first and second cam portions on which a cam is formed respectively, of which the camshaft is inserted thereto and of which relative phase angles with respect to the camshaft are variable, a first and second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively, a slider housing in which the first and second inner brackets are rotatably inserted, of which a relative position with respect to the camshaft is variable, and on which a control slot is formed, a cam cap rotatably supporting the first and the second cam portions and to which the slider housing is slidably mounted, a control shaft parallel to the camshaft and on which a control rod is eccentrically formed, an eccentric plate rotatably connected to the control rod and rotatably inserted into the control slot, a separation prevention pin disposed to inhibit the eccentric plate from being separated from the slider housing and a control portion selectively rotating the control shaft so as to controlling a position of the slider housing.