Continuous Variable Valve Lift Apparatus with Integrated Cam Control
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Solution Overview
Problem
Existing continuous variable valve lift and valve timing systems are complex and costly, failing to efficiently optimize valve operation based on engine speed with a simple construction.
Innovation Solution
A continuously variable valve lift apparatus with a camshaft, slider housing, guide slot, control portion, and valve shoe, featuring a compact design that adjusts valve lift and timing using a motor-driven eccentric shaft, reducing the number of components and allowing for minimal valve lift duration and advanced closing timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If general CVVL and CVVT systems are used to optimize valve operation according to engine speed, then valve lift and timing can be adjusted, but the construction becomes complicated and manufacturing cost increases
Solution Approach 1:
The patent combines the valve lift control function and valve timing control function into a single integrated apparatus. The camshaft assembly with adjustable cam portion position simultaneously controls both the lift amount and timing, eliminating the need for separate CVVL and CVVT systems. This merging reduces construction complexity while maintaining adaptability for optimizing valve operation across different engine speeds
Solution Approach 2:
The cam portion is designed to be universally adjustable for multiple functions: it can change both the lift amount and the timing of valve opening and closing. By making a single component multi-functional, the system achieves versatile valve operation control without requiring multiple specialized components, thereby reducing overall system complexity
2Manufacturing precision
If multiple components are used for valve lift and timing control, then precise control is achieved, but the number of parts increases and production cost rises
Solution Approach 1:
Multiple control functions that would traditionally require separate components are merged into the single camshaft assembly with an adjustable cam portion. The cam portion's position relative to the camshaft body simultaneously determines both lift and timing, reducing the quantity of components while maintaining manufacturing precision through the integrated design
Solution Approach 2:
The cam portion is nested within the camshaft assembly, allowing it to be adjusted to different positions along the camshaft axis. This nesting arrangement enables precise control of valve operation with minimal components, as the cam portion's axial position directly controls both lift and timing parameters without requiring additional separate mechanisms
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 solution enables reduced valve lift duration, advanced intake valve closing timing, improved fuel economy, and a more compact valve train, while being applicable to existing engines with minimal modifications, thus enhancing productivity and reducing production costs.
Implementation Method 1
a camshaft, a cam portion of which a cam is formed thereto
Implementation Method 2
a slider housing of which the cam portion is rotatably inserted therein, of which a position with respect to the camshaft is movable and of which a guide slot is formed thereto
Implementation Method 3
an output portion rotatable around a pivot shaft and of which a valve shoe is formed thereto
Data Source
AI summary
A continuously variable valve lift apparatus may include a camshaft, a cam portion of which a cam is formed thereto and the camshaft is inserted into therein, a slider housing of which the cam portion is rotatably inserted therein, of which a position with respect to the camshaft is movable and of which a guide slot is formed thereto, a control portion selectively changing the position of the slider housing, a guide shaft disposed parallel to the camshaft and inserted into the guide slot for guiding movement of the slider housing, an output portion rotatable around a pivot shaft and of which a valve shoe is formed thereto and a valve unit driven by the valve shoe.