Valve Lift Control Device Cam Alignment via Locking Pin
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Solution Overview
Problem
The manufacturing of valve control devices with complex cam shapes and protrusions is expensive and difficult due to the need for grinding, which complicates the production process.
Innovation Solution
A valve control device with co-axially arranged body parts, a spring to urge them apart, and a locking pin extending through one body part's cam to align and lock with the other body part, simplifying the manufacturing process by eliminating the need for grinding protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protrusions are added to cams to align and lock body parts, then the valve lift control function is improved, but the manufacturing complexity and cost increase due to expensive grinding processes
Solution Approach 1:
The invention extracts the locking function from the cam surface itself by using a separate locking pin that passes through the cam. This removes the need for complex protrusions to be ground into the cam surface, while still achieving the alignment and locking function. The locking pin is a separate component that can be easily manufactured and assembled.
2Reliability
If complex cam shapes with protrusions are manufactured, then the valve control device achieves proper cam engagement, but the production time and cost increase
Solution Approach 1:
The invention segments the cam structure by introducing a separate locking pin component. This divides the previously integrated cam-with-protrusions into two separate elements: the cam body and the locking pin. This segmentation allows each component to be manufactured independently using simpler processes, improving production efficiency while maintaining the engagement functionality.
3Manufacturing precision
If grinding processes are used to create precise cam protrusions, then the alignment precision is improved, but the manufacturing cost and process complexity increase
Solution Approach 1:
The locking pin acts as an intermediary element that provides the alignment and locking function without requiring complex grinding of the cam surface. The pin serves as a mediator between the cam body and the follower, ensuring precise alignment through its geometry rather than through complex cam surface features.
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 solution reduces manufacturing costs and complexity by allowing for easier production of valve control devices while maintaining effective cam engagement and valve lift control.
Implementation Method 1
a spring configured to urge the first body part and the second body part away from each other
Data Source
AI summary
A valve control device for controlling the stroke of a valve of a combustion engine includes: a first body part and a second body part, co-axially arranged, rotatably arranged relative to each other and axially displaceable between a first axial relative position and a second axial relative position; a spring for urging the first body part and the second body part away from each other; wherein the first and second body part have both axial surfaces facing each other and provided with cams evenly distributed along the circumference of the axial surface and wherein the pitch of the cams on both axial surfaces is equal; and a locking pin arranged in axial direction through the first body and extending on both sides, wherein one end of the locking pin extends through a cam.