Valve Control Apparatus with Synchronizing Pin Mechanism
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Solution Overview
Problem
Existing valve control systems for internal combustion engines face limitations in achieving multiple valve lift patterns due to size, weight, and cost constraints, leading to reduced engine performance, particularly when trying to optimize for different RPM modes and power efficiency.
Innovation Solution
A valve control apparatus with a central rocker arm and two adjacent rocker arms, synchronized by a dual synchronizing pin that can switch between three states to transfer pivotal movement from either adjacent rocker arm to the central rocker arm, allowing for three modes of operation: normal, high power, and deactivated modes, enabling custom-tailored valve timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple rocker arms are used to achieve multiple valve lift patterns, then engine performance and adaptability are improved, but device complexity and reciprocating mass increase
Solution Approach 1:
The single rocker arm is designed to perform multiple functions by selectively connecting to different cams (low RPM cam, high RPM cam, or deactivated position) through the synchronizing pin mechanism, eliminating the need for separate rocker arms for each cam profile
Solution Approach 2:
The invention combines the functions of multiple rocker arms into a single rocker arm that can operate with different cams, reducing the number of components while maintaining the capability for multiple valve lift patterns
2Adaptability or versatility
If three or more rocker arms are connected to guarantee quick valve lift pattern selection, then adaptability is improved, but reciprocating mass becomes undesirably large
Solution Approach 1:
The system is segmented into functional modules: a single rocker arm, a synchronizing pin with multiple positions, and multiple cams, allowing selective engagement without requiring all components to move simultaneously
Solution Approach 2:
The invention extracts the essential function of multiple rocker arms by using a single rocker arm that can be selectively connected to different cams, removing the unnecessary mass of multiple rocker arms while retaining the adaptive capability
3Ease of operation
If multiple synchronizing pins are used to control multiple rocker arms, then valve lift pattern control is improved, but device complexity and cost increase
Solution Approach 1:
The single synchronizing pin is designed with multi-position capability to selectively connect the rocker arm to different cams or deactivate it, performing the function of multiple synchronizing pins with a single component
Data Source
AI summary
A valve control synchronizing apparatus for an internal combustion engine for controlling opening and closing operations of an engine valve includes a synchronizing pin assembly selectively transferring pivoting movement from one or both of first and second adjacent rocker arms to a central rocker arm. The synchronizing pin assembly is received in a bore defined through the central rocker arm and at least partially into each of the first and second rocker arms. The synchronizing pin assembly bridges between the first rocker arm and the central rocker arm to transfer pivoting movement of the first rocker arm to the central rocker arm and bridges between the second rocker arm and the central rocker arm to transfer pivoting movement from the second rocker arm to the central rocker arm.