Castellation Assembly Floating Design for Compact Packaging
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Solution Overview
Problem
Rocker arm systems face challenges in compact packaging due to the need to accommodate castellation pins rising out of the rocker arm, especially in applications with limited space, such as cylinder deactivation systems, where traditional castellation mechanisms are not efficient.
Innovation Solution
A castellation assembly with a floating design, incorporating a lost motion spring assembly and a stepped lash screw, which allows the upper castellation piece to float above the lower castellation piece, enabling compact packaging and easy actuation without a moving post protruding from the rocker arm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional castellation mechanism with a moving post is used, then the castellation assembly can be actuated, but the moving post protrudes from the rocker arm which increases the overall size and reduces compact packaging efficiency
Solution Approach 1:
The spring post is nested within the hollow body of the upper castellation piece, with the spring post terminating inside the hollow body rather than protruding outward. This nesting arrangement allows the castellation assembly to maintain a compact size while still enabling actuation through the spring mechanism, directly resolving the contradiction between compact packaging and ease of operation.
2Ease of operation
If the upper castellation piece is fixed to the lower castellation piece, then structural stability is improved, but actuation becomes difficult due to dragging contact between pieces
Solution Approach 1:
The upper castellation piece is designed to float above the lower castellation piece rather than being fixed, allowing dynamic movement during actuation. The lost motion spring assembly provides the floating mechanism, enabling the upper piece to move freely during actuation while maintaining structural integrity through the spring connection, thus resolving the contradiction between ease of operation and structural stability.
3Adaptability or versatility
If the spring post extends through the entire castellation assembly, then the floating mechanism is achieved, but the assembly size increases due to protruding posts
Solution Approach 1:
The spring post is positioned within the hollow body of the upper castellation piece, with its end terminating inside the hollow body rather than extending outward. This nested arrangement achieves the floating mechanism through the spring while keeping the overall assembly length compact, directly resolving the contradiction between adaptability for floating operation and the length of the stationary assembly.
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 provides a durable and compact castellation assembly that facilitates easy actuation and adaptable valve lift profiles, enabling efficient operation in constrained spaces while maintaining strength and durability.
Implementation Method 1
A lost motion spring is seated against the spring hat. The lost motion spring is biased against the castellation body to lift the upper inner rim by the brim. The upper castellation piece can be biased by the lost motion spring assembly to float above the castellation body of the lower castellation piece.
Implementation Method 2
A lash screw can house the spring post so that the spring post terminates inside the lash screw. Lash screw can comprise a first outer diameter of a lash screw body configured to seat in a lash-setting bore.
Data Source
AI summary
A castellation assembly comprises a lost motion spring assembly, an upper castellation piece, and a lower castellation piece. A spring hat comprises a crown, a pin hole through the crown, and a brim. A lost motion spring is seated against the spring hat. Upper castellation piece comprises a tubular body, an upper inner rim adjoining the brim, and upper castellation teeth. Lower castellation piece comprises a spring post extending up from a castellation body, the spring post passing through the lost motion spring, and through the pin hole. Lower castellation teeth extend from the castellation body. The lost motion spring is biased against the castellation body to lift the upper inner rim by the brim. A lash screw can house the spring post so that the spring post terminates inside the lash screw. A rocker arm is an example of a castellation assembly installation.