Integrated Cam-Side Valve Train for Engine Brake and Cylinder Deactivation
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Solution Overview
Problem
Existing valve train systems in internal combustion engines face challenges in integrating engine brake and cylinder deactivation functionalities, leading to increased packaging space and complexity, which affects dynamic behavior and assembly costs.
Innovation Solution
A valve train assembly that combines engine brake and cylinder deactivation components on the cam side of the rocker arm, utilizing an engine brake capsule and a cylinder deactivation capsule, with hydraulic or mechanical control, to enable selective actuation and reduce packaging space and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If engine brake and cylinder deactivation components are integrated on the cam side of the rocker arm, then packaging space is reduced and assembly is simplified, but device complexity increases due to the combined capsule mechanism
Solution Approach 1:
The patent combines engine brake and cylinder deactivation components into a single integrated capsule assembly mounted on the cam side of the rocker arm. This merging of previously separate systems into one unified structure reduces packaging space and simplifies assembly while managing complexity through functional integration.
Solution Approach 2:
The integrated capsule serves multiple functions: it provides both engine brake operation and cylinder deactivation capability within a single component assembly. This multi-functionality allows the system to perform diverse tasks without requiring separate dedicated components for each function.
2Device complexity
If separate engine brake and cylinder deactivation systems are used, then device complexity is reduced, but packaging space increases and assembly becomes more complex
Solution Approach 1:
Rather than using separate systems, the patent merges engine brake and cylinder deactivation into one integrated capsule. This consolidation eliminates the need for separate mounting spaces and reduces overall packaging volume while maintaining the functional capabilities of both systems.
Solution Approach 2:
The design places both engine brake and cylinder deactivation components within the same capsule housing, nesting multiple functional elements into a compact shared structure. This nesting approach maximizes space efficiency by utilizing the same physical envelope for multiple functions.
3Ease of manufacture
If traditional valve train systems are used without integration, then assembly is simplified, but dynamic behavior is compromised due to increased packaging space and complexity
Solution Approach 1:
The integration of engine brake and cylinder deactivation components into a single capsule improves dynamic behavior by reducing the number of separate assemblies and mounting points. This merging creates a more compact, rigid structure with fewer potential failure points while maintaining ease of assembly through standardized mounting interfaces.
Solution Approach 2:
The patent optimizes the local structure at the rocker arm cam side by concentrating both functions in one location. This localized integration improves dynamic characteristics in the critical valve train region while keeping the rest of the system simple and easy to assemble.
Data Source
AI summary
In one embodiment, a valve train assembly includes a rocker arm having a cam end in proximity to a cam and a valve end opposite to the cam end and in proximity to one or more valves, an engine brake capsule coupled to the cam end, and a cylinder deactivation capsule coupled to the cam end. The engine brake capsule includes an actuation pin assembly, a check valve assembly, and a plunger, and is configured to switch between a retracted position and an extended position. The cylinder deactivation capsule includes an outer body, an inner body, and a latching mechanism, and is configured to switch between a latched position and an unlatched position. In this way, the valve train assembly may perform both engine brake and cylinder deactivation functionalities, for example, at the cam side of the valve train assembly.