Variable Valve Device Hydraulic Lash Adjuster Integration
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Solution Overview
Problem
Existing variable valve trains in internal combustion engines face challenges in compactly integrating a hydraulic pressure lash adjuster and valve deactivation device, particularly in restricted spaces, which complicates the control of valve motion and fuel efficiency.
Innovation Solution
The engine incorporates a hydraulic pressure lash adjuster with a pivotally supported swing arm, a slave piston, a master piston, an oil control valve, and a latching mechanism, allowing for precise control of valve actuation through a simple structure that reduces weight and size, including a brake chamber and latching system for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pivot portion is used to reduce the gap between valve and swing arm, then valve motion control is improved, but the structure becomes more complex and difficult to constitute in restricted space
Solution Approach 1:
The patent combines the hydraulic pressure lash adjuster and valve deactivation device into a single integrated structure. The lash adjuster housing serves as both the hydraulic actuator and the valve deactivation mechanism, eliminating the need for separate pivot portions and reducing overall structural complexity while maintaining precise valve motion control.
Solution Approach 2:
The hydraulic pressure lash adjuster is designed to perform multiple functions: it acts as a hydraulic actuator for valve lift control, a valve deactivation device for closing the intake valve, and a space-efficient mechanical linkage. This multi-functionality reduces the number of separate components needed in the valve train system.
2Device complexity
If hydraulic pressure lash adjuster and valve deactivation device are integrated, then structure is simplified, but precise control of valve motion becomes more difficult
Solution Approach 1:
The integrated hydraulic pressure lash adjuster is divided into functionally independent segments: a hydraulic actuator portion for pressure-controlled valve lift, a valve deactivation portion for independent intake valve closing, and a linkage portion for motion transmission. This segmentation allows each function to be optimized independently while maintaining overall structural simplicity.
Solution Approach 2:
The system employs dynamic control through hydraulic pressure regulation to adjust valve lift in real-time, while the valve deactivation portion provides independent dynamic control of the intake valve timing. This dynamic capability enables precise valve motion control despite the simplified integrated structure.
3Volume of moving object
If variable valve device is designed for compact space, then engine space utilization is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs a nested arrangement where the slave piston is positioned within the master piston cylinder, and the valve deactivation device is integrated within the hydraulic actuator housing. This nesting approach maximizes space utilization while maintaining manufacturing precision through standardized interface dimensions and tolerance accumulations designed into the nested 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
This configuration enables accurate and variable control of valve motion, improving fuel efficiency by simplifying the structure and reducing weight, while maintaining compactness and efficiency in valve actuation.
Implementation Method 1
an hydraulic pressure lash adjuster pivotally supporting one side of a swing arm... a master piston of which an end thereof may be placed into the insertion hole with a predetermined gap from the slave piston... an oil control valve that opens or closes a passage communicating with a master chamber that may be formed between the master piston and the slave piston in the housing
Implementation Method 2
a master spring that elastically supports the master piston outwards in the master chamber, and a slave spring that elastically supports the slave piston towards the stopper in the insertion hole
Data Source
AI summary
An engine that may be provided with a variable valve device may include an hydraulic pressure lash adjuster pivotally supporting one side of a swing arm, a valve supporting the other side of the swing arm, and an operating portion pushing a portion of the swing arm downwards so as to pivotally move the valve based on the hydraulic pressure lash adjuster, wherein the hydraulic pressure lash adjuster includes a housing in which an insertion hole may be formed therein, a slave piston that may be slidably inserted into the insertion hole, a master piston of which an end thereof may be placed into the insertion hole with a predetermined gap from the slave piston, wherein the other end of the master piston protrudes out of the housing and may be engaged with the one side of the swing arm, and an oil control valve that opens or closes a passage communicating with a master chamber that may be formed between the master piston and the slave piston in the housing.