Continuous Variable Valve Duration Apparatus for Engine Timing
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Solution Overview
Problem
Existing continuous variable valve systems, such as CVVL and CVVT, are complex and costly due to their intricate construction, which makes them inefficient for optimizing valve operation based on engine speed.
Innovation Solution
A continuous variable valve duration apparatus with a simplified design, featuring a camshaft, variable phase angle cam portions, inner brackets, a slider housing, and a control mechanism that adjusts valve opening duration based on engine operation conditions, allowing for flexible valve timing without excessive 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 camshaft is divided into first and second cam portions that can rotate independently relative to each other. The first cam portion controls intake valves while the second cam portion controls exhaust valves, allowing separate optimization of intake and exhaust valve timing without requiring complex multi-cam systems
Solution Approach 2:
The apparatus combines variable valve timing and variable valve duration functions into a single integrated system. The slider housing simultaneously controls both the timing (phase angle) and duration (opening/closing period) of valve operation, eliminating the need for separate CVVT and CVVL mechanisms
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 slider housing serves multiple functions simultaneously: it acts as a guide for cam portion rotation, a support for inner brackets, and a control mechanism for both valve timing and duration. This multi-functionality reduces the total number of components needed, simplifying manufacturing and reducing costs
Solution Approach 2:
The first and second inner brackets are rotatably inserted into the slider housing, creating a nested structure where smaller components fit within larger ones. This nesting reduces the overall footprint and simplifies assembly, contributing to lower manufacturing costs
3Adaptability or versatility
If existing engines are modified to implement valve optimization systems, then valve operation can be optimized, but excessive modification increases complexity and cost
Solution Approach 1:
The system introduces dynamic adjustability to existing engine architectures through the slider housing mechanism. The cam portions can dynamically change their phase angle and rotation speed relative to the camshaft, allowing optimization of valve operation without fundamentally redesigning the engine block or core 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 reduces the size and complexity of the valve train, enhances productivity, and lowers production costs while enabling optimal valve operation across varying engine speeds.
Implementation Method 1
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; first and second cam portions on which a cam is formed respectively, to which the camshaft is inserted and of which relative phase angles with respect to the camshaft are variable; 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, 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 which is 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; and a control portion selectively rotating the control shaft.