Continuous Variable Valve Lift Mechanism for Engine Optimization
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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, leading to suboptimal performance and increased manufacturing costs.
Innovation Solution
A continuously variable valve lift apparatus with a simple construction, featuring a camshaft, cam portion, slider housing, and control mechanism that adjusts valve lift by changing the relative position of the slider housing and output portion, allowing for integral cam and rotation member design, and a bearing for smooth rotation, enabling reduced valve lift duration and advanced valve closing timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If general CVVL and CVTT are used to change valve lift and timing according to engine speed, then optimal valve operation is achieved, but construction becomes complicated and manufacturing cost increases
Solution Approach 1:
The cam mechanism is segmented into modular components: camshaft, cam portion with two cams, slider housing with pivot shaft, output portion with valve shoes, and control portion. Each module performs a specific function and can be manufactured independently, simplifying the overall construction while maintaining continuous variable valve lift capability.
Solution Approach 2:
The slider housing serves multiple functions: it guides the output portion, provides rotation around the pivot shaft, and works with the control portion to adjust valve lift. The cam portion with two cams can control both intake and exhaust valves simultaneously. This multi-functionality reduces the number of separate components needed.
2Productivity
If existing engines are modified to implement continuous variable valve lift, then valve operation optimization is achieved, but manufacturing cost increases
Solution Approach 1:
The system dynamically adjusts valve lift continuously based on engine operating conditions. The control portion can selectively change the position of the slider housing, allowing the valve lift to vary in real-time according to engine speed and load, optimizing fuel economy across different operating ranges.
Solution Approach 2:
The invention changes the lift parameter of valves continuously rather than using fixed lift mechanisms. By varying the position of the slider housing and the orientation of the output portion around the pivot shaft, the system achieves continuous parameter adjustment of valve lift, improving engine efficiency without requiring complete engine redesign.
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 reduces valve lift duration, advances intake valve closing timing, enhances fuel economy, and decreases the size of the valve train, while being applicable to existing engines with minimal modifications, thus lowering production costs and improving productivity.
Implementation Method 1
a bearing inserted between the rotation member and the slider housing
Implementation Method 2
The control portion may include an eccentric shaft connected to the slider housing
Data Source
AI summary
A continuously variable valve lift apparatus may include a camshaft, a cam portion on which two cams are formed and on which a rotation member is formed between the cams, a slider housing into which the rotation member is rotatably inserted, and rotatable around a pivot shaft, a control portion configured to selectively change a position of the slider housing, an output portion contacting the cams, rotatable around the pivot shaft and on which a valve shoe is formed, and a valve device configured to be driven by the valve shoe.