Removable Valve Bridge Slot Design for Engine Actuation
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Solution Overview
Problem
Existing valve actuation systems in internal combustion engines are complex, leading to increased servicing and maintenance costs, as well as the need for precise fabrication of valve bridges for specific engine configurations, making it difficult to use a single valve bridge across different engine families or cylinder sizes.
Innovation Solution
A valve bridge design with a slot and open end that allows for longitudinal removal without requiring the removal of other actuation components, and a contoured surface for easy installation and removal, enabling a single valve bridge configuration to be used across different engine families and valve spans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If valve bridges are designed with fixed configurations for specific engine families, then manufacturing precision is improved, but adaptability deteriorates
Solution Approach 1:
The valve bridge is divided into modular components including a bridge body, bridge pin, and retention feature that can be independently positioned and secured. This segmentation allows the same bridge design to be configured for different valve spans and engine families by adjusting component positions rather than manufacturing entirely different bridge structures.
Solution Approach 2:
The retention feature is pre-configured on the bridge pin to engage with the bridge body at predetermined positions. This preliminary configuration enables the valve bridge assembly to be quickly adapted to different engine configurations by simply repositioning and securing the bridge pin, without requiring complex manufacturing variations for each engine family.
2Adaptability or versatility
If complex valve actuation systems are used to achieve multiple power objectives, then power objective capability is improved, but device complexity increases
Solution Approach 1:
The valve bridge design incorporates a universal bridge pin with retention features that can accommodate multiple valve configurations and actuation requirements within a single engine family. This multi-functional design allows the same basic structure to support different power objectives (positive power, engine braking, EGR) without requiring entirely separate actuation systems for each function.
3Ease of manufacture
If traditional valve bridge retention methods are used, then manufacturing simplicity is improved, but ease of repair deteriorates
Solution Approach 1:
The retention feature is designed to transition from a static permanent attachment to a dynamic removable connection. The bridge pin can be easily removed and repositioned along the valve bridge to accommodate different valve configurations, and can be completely removed for servicing fuel injectors or other components, combining manufacturing simplicity with ease of repair.
Data Source
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AI summary
A system for actuating engine valves may include a valve bridge having a main event rocker interface portion, a first valve interface portion and a second valve interface portion extending in generally opposite directions from the main event rocker interface portion. The second valve interface portion may include an open end including a slot for receiving a bridge pin. The slot permits the valve bridge to be removed from the actuation system without removal of the main event rocker or other actuating components, such as an auxiliary rocker. The valve bridge can be removed from the valve train without requiring removal of other actuation system components, such as auxiliary rockers or main event rockers. A single valve bridge configuration can be used with different valve spans, which may occur among different cylinder sizes in a given engine family, or across different engine families.